View.java revision a9108a217e039492855fbeacda2ab6c4f4a3f70a
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.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.os.Bundle; 43import android.os.Handler; 44import android.os.IBinder; 45import android.os.Parcel; 46import android.os.Parcelable; 47import android.os.RemoteException; 48import android.os.SystemClock; 49import android.os.SystemProperties; 50import android.util.AttributeSet; 51import android.util.FloatProperty; 52import android.util.LocaleUtil; 53import android.util.Log; 54import android.util.Pool; 55import android.util.Poolable; 56import android.util.PoolableManager; 57import android.util.Pools; 58import android.util.Property; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.AccessibilityIterators.TextSegmentIterator; 63import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 64import android.view.AccessibilityIterators.WordTextSegmentIterator; 65import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 66import android.view.accessibility.AccessibilityEvent; 67import android.view.accessibility.AccessibilityEventSource; 68import android.view.accessibility.AccessibilityManager; 69import android.view.accessibility.AccessibilityNodeInfo; 70import android.view.accessibility.AccessibilityNodeProvider; 71import android.view.animation.Animation; 72import android.view.animation.AnimationUtils; 73import android.view.animation.Transformation; 74import android.view.inputmethod.EditorInfo; 75import android.view.inputmethod.InputConnection; 76import android.view.inputmethod.InputMethodManager; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85 86import java.lang.ref.WeakReference; 87import java.lang.reflect.InvocationTargetException; 88import java.lang.reflect.Method; 89import java.util.ArrayList; 90import java.util.Arrays; 91import java.util.Locale; 92import java.util.concurrent.CopyOnWriteArrayList; 93import java.util.concurrent.atomic.AtomicInteger; 94 95/** 96 * <p> 97 * This class represents the basic building block for user interface components. A View 98 * occupies a rectangular area on the screen and is responsible for drawing and 99 * event handling. View is the base class for <em>widgets</em>, which are 100 * used to create interactive UI components (buttons, text fields, etc.). The 101 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 102 * are invisible containers that hold other Views (or other ViewGroups) and define 103 * their layout properties. 104 * </p> 105 * 106 * <div class="special reference"> 107 * <h3>Developer Guides</h3> 108 * <p>For information about using this class to develop your application's user interface, 109 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 110 * </div> 111 * 112 * <a name="Using"></a> 113 * <h3>Using Views</h3> 114 * <p> 115 * All of the views in a window are arranged in a single tree. You can add views 116 * either from code or by specifying a tree of views in one or more XML layout 117 * files. There are many specialized subclasses of views that act as controls or 118 * are capable of displaying text, images, or other content. 119 * </p> 120 * <p> 121 * Once you have created a tree of views, there are typically a few types of 122 * common operations you may wish to perform: 123 * <ul> 124 * <li><strong>Set properties:</strong> for example setting the text of a 125 * {@link android.widget.TextView}. The available properties and the methods 126 * that set them will vary among the different subclasses of views. Note that 127 * properties that are known at build time can be set in the XML layout 128 * files.</li> 129 * <li><strong>Set focus:</strong> The framework will handled moving focus in 130 * response to user input. To force focus to a specific view, call 131 * {@link #requestFocus}.</li> 132 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 133 * that will be notified when something interesting happens to the view. For 134 * example, all views will let you set a listener to be notified when the view 135 * gains or loses focus. You can register such a listener using 136 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 137 * Other view subclasses offer more specialized listeners. For example, a Button 138 * exposes a listener to notify clients when the button is clicked.</li> 139 * <li><strong>Set visibility:</strong> You can hide or show views using 140 * {@link #setVisibility(int)}.</li> 141 * </ul> 142 * </p> 143 * <p><em> 144 * Note: The Android framework is responsible for measuring, laying out and 145 * drawing views. You should not call methods that perform these actions on 146 * views yourself unless you are actually implementing a 147 * {@link android.view.ViewGroup}. 148 * </em></p> 149 * 150 * <a name="Lifecycle"></a> 151 * <h3>Implementing a Custom View</h3> 152 * 153 * <p> 154 * To implement a custom view, you will usually begin by providing overrides for 155 * some of the standard methods that the framework calls on all views. You do 156 * not need to override all of these methods. In fact, you can start by just 157 * overriding {@link #onDraw(android.graphics.Canvas)}. 158 * <table border="2" width="85%" align="center" cellpadding="5"> 159 * <thead> 160 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 161 * </thead> 162 * 163 * <tbody> 164 * <tr> 165 * <td rowspan="2">Creation</td> 166 * <td>Constructors</td> 167 * <td>There is a form of the constructor that are called when the view 168 * is created from code and a form that is called when the view is 169 * inflated from a layout file. The second form should parse and apply 170 * any attributes defined in the layout file. 171 * </td> 172 * </tr> 173 * <tr> 174 * <td><code>{@link #onFinishInflate()}</code></td> 175 * <td>Called after a view and all of its children has been inflated 176 * from XML.</td> 177 * </tr> 178 * 179 * <tr> 180 * <td rowspan="3">Layout</td> 181 * <td><code>{@link #onMeasure(int, int)}</code></td> 182 * <td>Called to determine the size requirements for this view and all 183 * of its children. 184 * </td> 185 * </tr> 186 * <tr> 187 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 188 * <td>Called when this view should assign a size and position to all 189 * of its children. 190 * </td> 191 * </tr> 192 * <tr> 193 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 194 * <td>Called when the size of this view has changed. 195 * </td> 196 * </tr> 197 * 198 * <tr> 199 * <td>Drawing</td> 200 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 201 * <td>Called when the view should render its content. 202 * </td> 203 * </tr> 204 * 205 * <tr> 206 * <td rowspan="4">Event processing</td> 207 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 208 * <td>Called when a new hardware key event occurs. 209 * </td> 210 * </tr> 211 * <tr> 212 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 213 * <td>Called when a hardware key up event occurs. 214 * </td> 215 * </tr> 216 * <tr> 217 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 218 * <td>Called when a trackball motion event occurs. 219 * </td> 220 * </tr> 221 * <tr> 222 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 223 * <td>Called when a touch screen motion event occurs. 224 * </td> 225 * </tr> 226 * 227 * <tr> 228 * <td rowspan="2">Focus</td> 229 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 230 * <td>Called when the view gains or loses focus. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 236 * <td>Called when the window containing the view gains or loses focus. 237 * </td> 238 * </tr> 239 * 240 * <tr> 241 * <td rowspan="3">Attaching</td> 242 * <td><code>{@link #onAttachedToWindow()}</code></td> 243 * <td>Called when the view is attached to a window. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td><code>{@link #onDetachedFromWindow}</code></td> 249 * <td>Called when the view is detached from its window. 250 * </td> 251 * </tr> 252 * 253 * <tr> 254 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 255 * <td>Called when the visibility of the window containing the view 256 * has changed. 257 * </td> 258 * </tr> 259 * </tbody> 260 * 261 * </table> 262 * </p> 263 * 264 * <a name="IDs"></a> 265 * <h3>IDs</h3> 266 * Views may have an integer id associated with them. These ids are typically 267 * assigned in the layout XML files, and are used to find specific views within 268 * the view tree. A common pattern is to: 269 * <ul> 270 * <li>Define a Button in the layout file and assign it a unique ID. 271 * <pre> 272 * <Button 273 * android:id="@+id/my_button" 274 * android:layout_width="wrap_content" 275 * android:layout_height="wrap_content" 276 * android:text="@string/my_button_text"/> 277 * </pre></li> 278 * <li>From the onCreate method of an Activity, find the Button 279 * <pre class="prettyprint"> 280 * Button myButton = (Button) findViewById(R.id.my_button); 281 * </pre></li> 282 * </ul> 283 * <p> 284 * View IDs need not be unique throughout the tree, but it is good practice to 285 * ensure that they are at least unique within the part of the tree you are 286 * searching. 287 * </p> 288 * 289 * <a name="Position"></a> 290 * <h3>Position</h3> 291 * <p> 292 * The geometry of a view is that of a rectangle. A view has a location, 293 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 294 * two dimensions, expressed as a width and a height. The unit for location 295 * and dimensions is the pixel. 296 * </p> 297 * 298 * <p> 299 * It is possible to retrieve the location of a view by invoking the methods 300 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 301 * coordinate of the rectangle representing the view. The latter returns the 302 * top, or Y, coordinate of the rectangle representing the view. These methods 303 * both return the location of the view relative to its parent. For instance, 304 * when getLeft() returns 20, that means the view is located 20 pixels to the 305 * right of the left edge of its direct parent. 306 * </p> 307 * 308 * <p> 309 * In addition, several convenience methods are offered to avoid unnecessary 310 * computations, namely {@link #getRight()} and {@link #getBottom()}. 311 * These methods return the coordinates of the right and bottom edges of the 312 * rectangle representing the view. For instance, calling {@link #getRight()} 313 * is similar to the following computation: <code>getLeft() + getWidth()</code> 314 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 315 * </p> 316 * 317 * <a name="SizePaddingMargins"></a> 318 * <h3>Size, padding and margins</h3> 319 * <p> 320 * The size of a view is expressed with a width and a height. A view actually 321 * possess two pairs of width and height values. 322 * </p> 323 * 324 * <p> 325 * The first pair is known as <em>measured width</em> and 326 * <em>measured height</em>. These dimensions define how big a view wants to be 327 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 328 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 329 * and {@link #getMeasuredHeight()}. 330 * </p> 331 * 332 * <p> 333 * The second pair is simply known as <em>width</em> and <em>height</em>, or 334 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 335 * dimensions define the actual size of the view on screen, at drawing time and 336 * after layout. These values may, but do not have to, be different from the 337 * measured width and height. The width and height can be obtained by calling 338 * {@link #getWidth()} and {@link #getHeight()}. 339 * </p> 340 * 341 * <p> 342 * To measure its dimensions, a view takes into account its padding. The padding 343 * is expressed in pixels for the left, top, right and bottom parts of the view. 344 * Padding can be used to offset the content of the view by a specific amount of 345 * pixels. For instance, a left padding of 2 will push the view's content by 346 * 2 pixels to the right of the left edge. Padding can be set using the 347 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 348 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 349 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 350 * {@link #getPaddingEnd()}. 351 * </p> 352 * 353 * <p> 354 * Even though a view can define a padding, it does not provide any support for 355 * margins. However, view groups provide such a support. Refer to 356 * {@link android.view.ViewGroup} and 357 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 358 * </p> 359 * 360 * <a name="Layout"></a> 361 * <h3>Layout</h3> 362 * <p> 363 * Layout is a two pass process: a measure pass and a layout pass. The measuring 364 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 365 * of the view tree. Each view pushes dimension specifications down the tree 366 * during the recursion. At the end of the measure pass, every view has stored 367 * its measurements. The second pass happens in 368 * {@link #layout(int,int,int,int)} and is also top-down. During 369 * this pass each parent is responsible for positioning all of its children 370 * using the sizes computed in the measure pass. 371 * </p> 372 * 373 * <p> 374 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 375 * {@link #getMeasuredHeight()} values must be set, along with those for all of 376 * that view's descendants. A view's measured width and measured height values 377 * must respect the constraints imposed by the view's parents. This guarantees 378 * that at the end of the measure pass, all parents accept all of their 379 * children's measurements. A parent view may call measure() more than once on 380 * its children. For example, the parent may measure each child once with 381 * unspecified dimensions to find out how big they want to be, then call 382 * measure() on them again with actual numbers if the sum of all the children's 383 * unconstrained sizes is too big or too small. 384 * </p> 385 * 386 * <p> 387 * The measure pass uses two classes to communicate dimensions. The 388 * {@link MeasureSpec} class is used by views to tell their parents how they 389 * want to be measured and positioned. The base LayoutParams class just 390 * describes how big the view wants to be for both width and height. For each 391 * dimension, it can specify one of: 392 * <ul> 393 * <li> an exact number 394 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 395 * (minus padding) 396 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 397 * enclose its content (plus padding). 398 * </ul> 399 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 400 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 401 * an X and Y value. 402 * </p> 403 * 404 * <p> 405 * MeasureSpecs are used to push requirements down the tree from parent to 406 * child. A MeasureSpec can be in one of three modes: 407 * <ul> 408 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 409 * of a child view. For example, a LinearLayout may call measure() on its child 410 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 411 * tall the child view wants to be given a width of 240 pixels. 412 * <li>EXACTLY: This is used by the parent to impose an exact size on the 413 * child. The child must use this size, and guarantee that all of its 414 * descendants will fit within this size. 415 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 416 * child. The child must gurantee that it and all of its descendants will fit 417 * within this size. 418 * </ul> 419 * </p> 420 * 421 * <p> 422 * To intiate a layout, call {@link #requestLayout}. This method is typically 423 * called by a view on itself when it believes that is can no longer fit within 424 * its current bounds. 425 * </p> 426 * 427 * <a name="Drawing"></a> 428 * <h3>Drawing</h3> 429 * <p> 430 * Drawing is handled by walking the tree and rendering each view that 431 * intersects the invalid region. Because the tree is traversed in-order, 432 * this means that parents will draw before (i.e., behind) their children, with 433 * siblings drawn in the order they appear in the tree. 434 * If you set a background drawable for a View, then the View will draw it for you 435 * before calling back to its <code>onDraw()</code> method. 436 * </p> 437 * 438 * <p> 439 * Note that the framework will not draw views that are not in the invalid region. 440 * </p> 441 * 442 * <p> 443 * To force a view to draw, call {@link #invalidate()}. 444 * </p> 445 * 446 * <a name="EventHandlingThreading"></a> 447 * <h3>Event Handling and Threading</h3> 448 * <p> 449 * The basic cycle of a view is as follows: 450 * <ol> 451 * <li>An event comes in and is dispatched to the appropriate view. The view 452 * handles the event and notifies any listeners.</li> 453 * <li>If in the course of processing the event, the view's bounds may need 454 * to be changed, the view will call {@link #requestLayout()}.</li> 455 * <li>Similarly, if in the course of processing the event the view's appearance 456 * may need to be changed, the view will call {@link #invalidate()}.</li> 457 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 458 * the framework will take care of measuring, laying out, and drawing the tree 459 * as appropriate.</li> 460 * </ol> 461 * </p> 462 * 463 * <p><em>Note: The entire view tree is single threaded. You must always be on 464 * the UI thread when calling any method on any view.</em> 465 * If you are doing work on other threads and want to update the state of a view 466 * from that thread, you should use a {@link Handler}. 467 * </p> 468 * 469 * <a name="FocusHandling"></a> 470 * <h3>Focus Handling</h3> 471 * <p> 472 * The framework will handle routine focus movement in response to user input. 473 * This includes changing the focus as views are removed or hidden, or as new 474 * views become available. Views indicate their willingness to take focus 475 * through the {@link #isFocusable} method. To change whether a view can take 476 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 477 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 478 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 479 * </p> 480 * <p> 481 * Focus movement is based on an algorithm which finds the nearest neighbor in a 482 * given direction. In rare cases, the default algorithm may not match the 483 * intended behavior of the developer. In these situations, you can provide 484 * explicit overrides by using these XML attributes in the layout file: 485 * <pre> 486 * nextFocusDown 487 * nextFocusLeft 488 * nextFocusRight 489 * nextFocusUp 490 * </pre> 491 * </p> 492 * 493 * 494 * <p> 495 * To get a particular view to take focus, call {@link #requestFocus()}. 496 * </p> 497 * 498 * <a name="TouchMode"></a> 499 * <h3>Touch Mode</h3> 500 * <p> 501 * When a user is navigating a user interface via directional keys such as a D-pad, it is 502 * necessary to give focus to actionable items such as buttons so the user can see 503 * what will take input. If the device has touch capabilities, however, and the user 504 * begins interacting with the interface by touching it, it is no longer necessary to 505 * always highlight, or give focus to, a particular view. This motivates a mode 506 * for interaction named 'touch mode'. 507 * </p> 508 * <p> 509 * For a touch capable device, once the user touches the screen, the device 510 * will enter touch mode. From this point onward, only views for which 511 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 512 * Other views that are touchable, like buttons, will not take focus when touched; they will 513 * only fire the on click listeners. 514 * </p> 515 * <p> 516 * Any time a user hits a directional key, such as a D-pad direction, the view device will 517 * exit touch mode, and find a view to take focus, so that the user may resume interacting 518 * with the user interface without touching the screen again. 519 * </p> 520 * <p> 521 * The touch mode state is maintained across {@link android.app.Activity}s. Call 522 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 523 * </p> 524 * 525 * <a name="Scrolling"></a> 526 * <h3>Scrolling</h3> 527 * <p> 528 * The framework provides basic support for views that wish to internally 529 * scroll their content. This includes keeping track of the X and Y scroll 530 * offset as well as mechanisms for drawing scrollbars. See 531 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 532 * {@link #awakenScrollBars()} for more details. 533 * </p> 534 * 535 * <a name="Tags"></a> 536 * <h3>Tags</h3> 537 * <p> 538 * Unlike IDs, tags are not used to identify views. Tags are essentially an 539 * extra piece of information that can be associated with a view. They are most 540 * often used as a convenience to store data related to views in the views 541 * themselves rather than by putting them in a separate structure. 542 * </p> 543 * 544 * <a name="Properties"></a> 545 * <h3>Properties</h3> 546 * <p> 547 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 548 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 549 * available both in the {@link Property} form as well as in similarly-named setter/getter 550 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 551 * be used to set persistent state associated with these rendering-related properties on the view. 552 * The properties and methods can also be used in conjunction with 553 * {@link android.animation.Animator Animator}-based animations, described more in the 554 * <a href="#Animation">Animation</a> section. 555 * </p> 556 * 557 * <a name="Animation"></a> 558 * <h3>Animation</h3> 559 * <p> 560 * Starting with Android 3.0, the preferred way of animating views is to use the 561 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 562 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 563 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 564 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 565 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 566 * makes animating these View properties particularly easy and efficient. 567 * </p> 568 * <p> 569 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 570 * You can attach an {@link Animation} object to a view using 571 * {@link #setAnimation(Animation)} or 572 * {@link #startAnimation(Animation)}. The animation can alter the scale, 573 * rotation, translation and alpha of a view over time. If the animation is 574 * attached to a view that has children, the animation will affect the entire 575 * subtree rooted by that node. When an animation is started, the framework will 576 * take care of redrawing the appropriate views until the animation completes. 577 * </p> 578 * 579 * <a name="Security"></a> 580 * <h3>Security</h3> 581 * <p> 582 * Sometimes it is essential that an application be able to verify that an action 583 * is being performed with the full knowledge and consent of the user, such as 584 * granting a permission request, making a purchase or clicking on an advertisement. 585 * Unfortunately, a malicious application could try to spoof the user into 586 * performing these actions, unaware, by concealing the intended purpose of the view. 587 * As a remedy, the framework offers a touch filtering mechanism that can be used to 588 * improve the security of views that provide access to sensitive functionality. 589 * </p><p> 590 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 591 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 592 * will discard touches that are received whenever the view's window is obscured by 593 * another visible window. As a result, the view will not receive touches whenever a 594 * toast, dialog or other window appears above the view's window. 595 * </p><p> 596 * For more fine-grained control over security, consider overriding the 597 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 598 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 599 * </p> 600 * 601 * @attr ref android.R.styleable#View_alpha 602 * @attr ref android.R.styleable#View_background 603 * @attr ref android.R.styleable#View_clickable 604 * @attr ref android.R.styleable#View_contentDescription 605 * @attr ref android.R.styleable#View_drawingCacheQuality 606 * @attr ref android.R.styleable#View_duplicateParentState 607 * @attr ref android.R.styleable#View_id 608 * @attr ref android.R.styleable#View_requiresFadingEdge 609 * @attr ref android.R.styleable#View_fadeScrollbars 610 * @attr ref android.R.styleable#View_fadingEdgeLength 611 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 612 * @attr ref android.R.styleable#View_fitsSystemWindows 613 * @attr ref android.R.styleable#View_isScrollContainer 614 * @attr ref android.R.styleable#View_focusable 615 * @attr ref android.R.styleable#View_focusableInTouchMode 616 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 617 * @attr ref android.R.styleable#View_keepScreenOn 618 * @attr ref android.R.styleable#View_layerType 619 * @attr ref android.R.styleable#View_longClickable 620 * @attr ref android.R.styleable#View_minHeight 621 * @attr ref android.R.styleable#View_minWidth 622 * @attr ref android.R.styleable#View_nextFocusDown 623 * @attr ref android.R.styleable#View_nextFocusLeft 624 * @attr ref android.R.styleable#View_nextFocusRight 625 * @attr ref android.R.styleable#View_nextFocusUp 626 * @attr ref android.R.styleable#View_onClick 627 * @attr ref android.R.styleable#View_padding 628 * @attr ref android.R.styleable#View_paddingBottom 629 * @attr ref android.R.styleable#View_paddingLeft 630 * @attr ref android.R.styleable#View_paddingRight 631 * @attr ref android.R.styleable#View_paddingTop 632 * @attr ref android.R.styleable#View_paddingStart 633 * @attr ref android.R.styleable#View_paddingEnd 634 * @attr ref android.R.styleable#View_saveEnabled 635 * @attr ref android.R.styleable#View_rotation 636 * @attr ref android.R.styleable#View_rotationX 637 * @attr ref android.R.styleable#View_rotationY 638 * @attr ref android.R.styleable#View_scaleX 639 * @attr ref android.R.styleable#View_scaleY 640 * @attr ref android.R.styleable#View_scrollX 641 * @attr ref android.R.styleable#View_scrollY 642 * @attr ref android.R.styleable#View_scrollbarSize 643 * @attr ref android.R.styleable#View_scrollbarStyle 644 * @attr ref android.R.styleable#View_scrollbars 645 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 646 * @attr ref android.R.styleable#View_scrollbarFadeDuration 647 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 648 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 649 * @attr ref android.R.styleable#View_scrollbarThumbVertical 650 * @attr ref android.R.styleable#View_scrollbarTrackVertical 651 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 652 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 653 * @attr ref android.R.styleable#View_soundEffectsEnabled 654 * @attr ref android.R.styleable#View_tag 655 * @attr ref android.R.styleable#View_textAlignment 656 * @attr ref android.R.styleable#View_transformPivotX 657 * @attr ref android.R.styleable#View_transformPivotY 658 * @attr ref android.R.styleable#View_translationX 659 * @attr ref android.R.styleable#View_translationY 660 * @attr ref android.R.styleable#View_visibility 661 * 662 * @see android.view.ViewGroup 663 */ 664public class View implements Drawable.Callback, KeyEvent.Callback, 665 AccessibilityEventSource { 666 private static final boolean DBG = false; 667 668 /** 669 * The logging tag used by this class with android.util.Log. 670 */ 671 protected static final String VIEW_LOG_TAG = "View"; 672 673 /** 674 * When set to true, apps will draw debugging information about their layouts. 675 * 676 * @hide 677 */ 678 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 679 680 /** 681 * Used to mark a View that has no ID. 682 */ 683 public static final int NO_ID = -1; 684 685 /** 686 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 687 * calling setFlags. 688 */ 689 private static final int NOT_FOCUSABLE = 0x00000000; 690 691 /** 692 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 693 * setFlags. 694 */ 695 private static final int FOCUSABLE = 0x00000001; 696 697 /** 698 * Mask for use with setFlags indicating bits used for focus. 699 */ 700 private static final int FOCUSABLE_MASK = 0x00000001; 701 702 /** 703 * This view will adjust its padding to fit sytem windows (e.g. status bar) 704 */ 705 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 706 707 /** 708 * This view is visible. 709 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 710 * android:visibility}. 711 */ 712 public static final int VISIBLE = 0x00000000; 713 714 /** 715 * This view is invisible, but it still takes up space for layout purposes. 716 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 717 * android:visibility}. 718 */ 719 public static final int INVISIBLE = 0x00000004; 720 721 /** 722 * This view is invisible, and it doesn't take any space for layout 723 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 724 * android:visibility}. 725 */ 726 public static final int GONE = 0x00000008; 727 728 /** 729 * Mask for use with setFlags indicating bits used for visibility. 730 * {@hide} 731 */ 732 static final int VISIBILITY_MASK = 0x0000000C; 733 734 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 735 736 /** 737 * This view is enabled. Interpretation varies by subclass. 738 * Use with ENABLED_MASK when calling setFlags. 739 * {@hide} 740 */ 741 static final int ENABLED = 0x00000000; 742 743 /** 744 * This view is disabled. Interpretation varies by subclass. 745 * Use with ENABLED_MASK when calling setFlags. 746 * {@hide} 747 */ 748 static final int DISABLED = 0x00000020; 749 750 /** 751 * Mask for use with setFlags indicating bits used for indicating whether 752 * this view is enabled 753 * {@hide} 754 */ 755 static final int ENABLED_MASK = 0x00000020; 756 757 /** 758 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 759 * called and further optimizations will be performed. It is okay to have 760 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 761 * {@hide} 762 */ 763 static final int WILL_NOT_DRAW = 0x00000080; 764 765 /** 766 * Mask for use with setFlags indicating bits used for indicating whether 767 * this view is will draw 768 * {@hide} 769 */ 770 static final int DRAW_MASK = 0x00000080; 771 772 /** 773 * <p>This view doesn't show scrollbars.</p> 774 * {@hide} 775 */ 776 static final int SCROLLBARS_NONE = 0x00000000; 777 778 /** 779 * <p>This view shows horizontal scrollbars.</p> 780 * {@hide} 781 */ 782 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 783 784 /** 785 * <p>This view shows vertical scrollbars.</p> 786 * {@hide} 787 */ 788 static final int SCROLLBARS_VERTICAL = 0x00000200; 789 790 /** 791 * <p>Mask for use with setFlags indicating bits used for indicating which 792 * scrollbars are enabled.</p> 793 * {@hide} 794 */ 795 static final int SCROLLBARS_MASK = 0x00000300; 796 797 /** 798 * Indicates that the view should filter touches when its window is obscured. 799 * Refer to the class comments for more information about this security feature. 800 * {@hide} 801 */ 802 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 803 804 /** 805 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 806 * that they are optional and should be skipped if the window has 807 * requested system UI flags that ignore those insets for layout. 808 */ 809 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 810 811 /** 812 * <p>This view doesn't show fading edges.</p> 813 * {@hide} 814 */ 815 static final int FADING_EDGE_NONE = 0x00000000; 816 817 /** 818 * <p>This view shows horizontal fading edges.</p> 819 * {@hide} 820 */ 821 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 822 823 /** 824 * <p>This view shows vertical fading edges.</p> 825 * {@hide} 826 */ 827 static final int FADING_EDGE_VERTICAL = 0x00002000; 828 829 /** 830 * <p>Mask for use with setFlags indicating bits used for indicating which 831 * fading edges are enabled.</p> 832 * {@hide} 833 */ 834 static final int FADING_EDGE_MASK = 0x00003000; 835 836 /** 837 * <p>Indicates this view can be clicked. When clickable, a View reacts 838 * to clicks by notifying the OnClickListener.<p> 839 * {@hide} 840 */ 841 static final int CLICKABLE = 0x00004000; 842 843 /** 844 * <p>Indicates this view is caching its drawing into a bitmap.</p> 845 * {@hide} 846 */ 847 static final int DRAWING_CACHE_ENABLED = 0x00008000; 848 849 /** 850 * <p>Indicates that no icicle should be saved for this view.<p> 851 * {@hide} 852 */ 853 static final int SAVE_DISABLED = 0x000010000; 854 855 /** 856 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 857 * property.</p> 858 * {@hide} 859 */ 860 static final int SAVE_DISABLED_MASK = 0x000010000; 861 862 /** 863 * <p>Indicates that no drawing cache should ever be created for this view.<p> 864 * {@hide} 865 */ 866 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 867 868 /** 869 * <p>Indicates this view can take / keep focus when int touch mode.</p> 870 * {@hide} 871 */ 872 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 873 874 /** 875 * <p>Enables low quality mode for the drawing cache.</p> 876 */ 877 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 878 879 /** 880 * <p>Enables high quality mode for the drawing cache.</p> 881 */ 882 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 883 884 /** 885 * <p>Enables automatic quality mode for the drawing cache.</p> 886 */ 887 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 888 889 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 890 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 891 }; 892 893 /** 894 * <p>Mask for use with setFlags indicating bits used for the cache 895 * quality property.</p> 896 * {@hide} 897 */ 898 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 899 900 /** 901 * <p> 902 * Indicates this view can be long clicked. When long clickable, a View 903 * reacts to long clicks by notifying the OnLongClickListener or showing a 904 * context menu. 905 * </p> 906 * {@hide} 907 */ 908 static final int LONG_CLICKABLE = 0x00200000; 909 910 /** 911 * <p>Indicates that this view gets its drawable states from its direct parent 912 * and ignores its original internal states.</p> 913 * 914 * @hide 915 */ 916 static final int DUPLICATE_PARENT_STATE = 0x00400000; 917 918 /** 919 * The scrollbar style to display the scrollbars inside the content area, 920 * without increasing the padding. The scrollbars will be overlaid with 921 * translucency on the view's content. 922 */ 923 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 924 925 /** 926 * The scrollbar style to display the scrollbars inside the padded area, 927 * increasing the padding of the view. The scrollbars will not overlap the 928 * content area of the view. 929 */ 930 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 931 932 /** 933 * The scrollbar style to display the scrollbars at the edge of the view, 934 * without increasing the padding. The scrollbars will be overlaid with 935 * translucency. 936 */ 937 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 938 939 /** 940 * The scrollbar style to display the scrollbars at the edge of the view, 941 * increasing the padding of the view. The scrollbars will only overlap the 942 * background, if any. 943 */ 944 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 945 946 /** 947 * Mask to check if the scrollbar style is overlay or inset. 948 * {@hide} 949 */ 950 static final int SCROLLBARS_INSET_MASK = 0x01000000; 951 952 /** 953 * Mask to check if the scrollbar style is inside or outside. 954 * {@hide} 955 */ 956 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 957 958 /** 959 * Mask for scrollbar style. 960 * {@hide} 961 */ 962 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 963 964 /** 965 * View flag indicating that the screen should remain on while the 966 * window containing this view is visible to the user. This effectively 967 * takes care of automatically setting the WindowManager's 968 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 969 */ 970 public static final int KEEP_SCREEN_ON = 0x04000000; 971 972 /** 973 * View flag indicating whether this view should have sound effects enabled 974 * for events such as clicking and touching. 975 */ 976 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 977 978 /** 979 * View flag indicating whether this view should have haptic feedback 980 * enabled for events such as long presses. 981 */ 982 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 983 984 /** 985 * <p>Indicates that the view hierarchy should stop saving state when 986 * it reaches this view. If state saving is initiated immediately at 987 * the view, it will be allowed. 988 * {@hide} 989 */ 990 static final int PARENT_SAVE_DISABLED = 0x20000000; 991 992 /** 993 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 994 * {@hide} 995 */ 996 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 997 998 /** 999 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1000 * should add all focusable Views regardless if they are focusable in touch mode. 1001 */ 1002 public static final int FOCUSABLES_ALL = 0x00000000; 1003 1004 /** 1005 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1006 * should add only Views focusable in touch mode. 1007 */ 1008 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1009 1010 /** 1011 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1012 * item. 1013 */ 1014 public static final int FOCUS_BACKWARD = 0x00000001; 1015 1016 /** 1017 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1018 * item. 1019 */ 1020 public static final int FOCUS_FORWARD = 0x00000002; 1021 1022 /** 1023 * Use with {@link #focusSearch(int)}. Move focus to the left. 1024 */ 1025 public static final int FOCUS_LEFT = 0x00000011; 1026 1027 /** 1028 * Use with {@link #focusSearch(int)}. Move focus up. 1029 */ 1030 public static final int FOCUS_UP = 0x00000021; 1031 1032 /** 1033 * Use with {@link #focusSearch(int)}. Move focus to the right. 1034 */ 1035 public static final int FOCUS_RIGHT = 0x00000042; 1036 1037 /** 1038 * Use with {@link #focusSearch(int)}. Move focus down. 1039 */ 1040 public static final int FOCUS_DOWN = 0x00000082; 1041 1042 /** 1043 * Bits of {@link #getMeasuredWidthAndState()} and 1044 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1045 */ 1046 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1047 1048 /** 1049 * Bits of {@link #getMeasuredWidthAndState()} and 1050 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1051 */ 1052 public static final int MEASURED_STATE_MASK = 0xff000000; 1053 1054 /** 1055 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1056 * for functions that combine both width and height into a single int, 1057 * such as {@link #getMeasuredState()} and the childState argument of 1058 * {@link #resolveSizeAndState(int, int, int)}. 1059 */ 1060 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1061 1062 /** 1063 * Bit of {@link #getMeasuredWidthAndState()} and 1064 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1065 * is smaller that the space the view would like to have. 1066 */ 1067 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1068 1069 /** 1070 * Base View state sets 1071 */ 1072 // Singles 1073 /** 1074 * Indicates the view has no states set. States are used with 1075 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1076 * view depending on its state. 1077 * 1078 * @see android.graphics.drawable.Drawable 1079 * @see #getDrawableState() 1080 */ 1081 protected static final int[] EMPTY_STATE_SET; 1082 /** 1083 * Indicates the view is enabled. States are used with 1084 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1085 * view depending on its state. 1086 * 1087 * @see android.graphics.drawable.Drawable 1088 * @see #getDrawableState() 1089 */ 1090 protected static final int[] ENABLED_STATE_SET; 1091 /** 1092 * Indicates the view is focused. States are used with 1093 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1094 * view depending on its state. 1095 * 1096 * @see android.graphics.drawable.Drawable 1097 * @see #getDrawableState() 1098 */ 1099 protected static final int[] FOCUSED_STATE_SET; 1100 /** 1101 * Indicates the view is selected. States are used with 1102 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1103 * view depending on its state. 1104 * 1105 * @see android.graphics.drawable.Drawable 1106 * @see #getDrawableState() 1107 */ 1108 protected static final int[] SELECTED_STATE_SET; 1109 /** 1110 * Indicates the view is pressed. States are used with 1111 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1112 * view depending on its state. 1113 * 1114 * @see android.graphics.drawable.Drawable 1115 * @see #getDrawableState() 1116 * @hide 1117 */ 1118 protected static final int[] PRESSED_STATE_SET; 1119 /** 1120 * Indicates the view's window has focus. 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 */ 1127 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1128 // Doubles 1129 /** 1130 * Indicates the view is enabled and has the focus. 1131 * 1132 * @see #ENABLED_STATE_SET 1133 * @see #FOCUSED_STATE_SET 1134 */ 1135 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1136 /** 1137 * Indicates the view is enabled and selected. 1138 * 1139 * @see #ENABLED_STATE_SET 1140 * @see #SELECTED_STATE_SET 1141 */ 1142 protected static final int[] ENABLED_SELECTED_STATE_SET; 1143 /** 1144 * Indicates the view is enabled and that its window has focus. 1145 * 1146 * @see #ENABLED_STATE_SET 1147 * @see #WINDOW_FOCUSED_STATE_SET 1148 */ 1149 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1150 /** 1151 * Indicates the view is focused and selected. 1152 * 1153 * @see #FOCUSED_STATE_SET 1154 * @see #SELECTED_STATE_SET 1155 */ 1156 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1157 /** 1158 * Indicates the view has the focus and that its window has the focus. 1159 * 1160 * @see #FOCUSED_STATE_SET 1161 * @see #WINDOW_FOCUSED_STATE_SET 1162 */ 1163 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1164 /** 1165 * Indicates the view is selected and that its window has the focus. 1166 * 1167 * @see #SELECTED_STATE_SET 1168 * @see #WINDOW_FOCUSED_STATE_SET 1169 */ 1170 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1171 // Triples 1172 /** 1173 * Indicates the view is enabled, focused and selected. 1174 * 1175 * @see #ENABLED_STATE_SET 1176 * @see #FOCUSED_STATE_SET 1177 * @see #SELECTED_STATE_SET 1178 */ 1179 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1180 /** 1181 * Indicates the view is enabled, focused and its window has the focus. 1182 * 1183 * @see #ENABLED_STATE_SET 1184 * @see #FOCUSED_STATE_SET 1185 * @see #WINDOW_FOCUSED_STATE_SET 1186 */ 1187 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1188 /** 1189 * Indicates the view is enabled, selected and its window has the focus. 1190 * 1191 * @see #ENABLED_STATE_SET 1192 * @see #SELECTED_STATE_SET 1193 * @see #WINDOW_FOCUSED_STATE_SET 1194 */ 1195 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1196 /** 1197 * Indicates the view is focused, selected and its window has the focus. 1198 * 1199 * @see #FOCUSED_STATE_SET 1200 * @see #SELECTED_STATE_SET 1201 * @see #WINDOW_FOCUSED_STATE_SET 1202 */ 1203 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1204 /** 1205 * Indicates the view is enabled, focused, selected and its window 1206 * has the focus. 1207 * 1208 * @see #ENABLED_STATE_SET 1209 * @see #FOCUSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #WINDOW_FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1214 /** 1215 * Indicates the view is pressed and its window has the focus. 1216 * 1217 * @see #PRESSED_STATE_SET 1218 * @see #WINDOW_FOCUSED_STATE_SET 1219 */ 1220 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1221 /** 1222 * Indicates the view is pressed and selected. 1223 * 1224 * @see #PRESSED_STATE_SET 1225 * @see #SELECTED_STATE_SET 1226 */ 1227 protected static final int[] PRESSED_SELECTED_STATE_SET; 1228 /** 1229 * Indicates the view is pressed, selected and its window has the focus. 1230 * 1231 * @see #PRESSED_STATE_SET 1232 * @see #SELECTED_STATE_SET 1233 * @see #WINDOW_FOCUSED_STATE_SET 1234 */ 1235 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1236 /** 1237 * Indicates the view is pressed and focused. 1238 * 1239 * @see #PRESSED_STATE_SET 1240 * @see #FOCUSED_STATE_SET 1241 */ 1242 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1243 /** 1244 * Indicates the view is pressed, focused and its window has the focus. 1245 * 1246 * @see #PRESSED_STATE_SET 1247 * @see #FOCUSED_STATE_SET 1248 * @see #WINDOW_FOCUSED_STATE_SET 1249 */ 1250 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1251 /** 1252 * Indicates the view is pressed, focused and selected. 1253 * 1254 * @see #PRESSED_STATE_SET 1255 * @see #SELECTED_STATE_SET 1256 * @see #FOCUSED_STATE_SET 1257 */ 1258 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1259 /** 1260 * Indicates the view is pressed, focused, selected and its window has the focus. 1261 * 1262 * @see #PRESSED_STATE_SET 1263 * @see #FOCUSED_STATE_SET 1264 * @see #SELECTED_STATE_SET 1265 * @see #WINDOW_FOCUSED_STATE_SET 1266 */ 1267 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1268 /** 1269 * Indicates the view is pressed and enabled. 1270 * 1271 * @see #PRESSED_STATE_SET 1272 * @see #ENABLED_STATE_SET 1273 */ 1274 protected static final int[] PRESSED_ENABLED_STATE_SET; 1275 /** 1276 * Indicates the view is pressed, enabled and its window has the focus. 1277 * 1278 * @see #PRESSED_STATE_SET 1279 * @see #ENABLED_STATE_SET 1280 * @see #WINDOW_FOCUSED_STATE_SET 1281 */ 1282 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1283 /** 1284 * Indicates the view is pressed, enabled and selected. 1285 * 1286 * @see #PRESSED_STATE_SET 1287 * @see #ENABLED_STATE_SET 1288 * @see #SELECTED_STATE_SET 1289 */ 1290 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1291 /** 1292 * Indicates the view is pressed, enabled, selected and its window has the 1293 * focus. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #ENABLED_STATE_SET 1297 * @see #SELECTED_STATE_SET 1298 * @see #WINDOW_FOCUSED_STATE_SET 1299 */ 1300 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1301 /** 1302 * Indicates the view is pressed, enabled and focused. 1303 * 1304 * @see #PRESSED_STATE_SET 1305 * @see #ENABLED_STATE_SET 1306 * @see #FOCUSED_STATE_SET 1307 */ 1308 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1309 /** 1310 * Indicates the view is pressed, enabled, focused and its window has the 1311 * focus. 1312 * 1313 * @see #PRESSED_STATE_SET 1314 * @see #ENABLED_STATE_SET 1315 * @see #FOCUSED_STATE_SET 1316 * @see #WINDOW_FOCUSED_STATE_SET 1317 */ 1318 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1319 /** 1320 * Indicates the view is pressed, enabled, focused and selected. 1321 * 1322 * @see #PRESSED_STATE_SET 1323 * @see #ENABLED_STATE_SET 1324 * @see #SELECTED_STATE_SET 1325 * @see #FOCUSED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, enabled, focused, selected and its window 1330 * has the focus. 1331 * 1332 * @see #PRESSED_STATE_SET 1333 * @see #ENABLED_STATE_SET 1334 * @see #SELECTED_STATE_SET 1335 * @see #FOCUSED_STATE_SET 1336 * @see #WINDOW_FOCUSED_STATE_SET 1337 */ 1338 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1339 1340 /** 1341 * The order here is very important to {@link #getDrawableState()} 1342 */ 1343 private static final int[][] VIEW_STATE_SETS; 1344 1345 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1346 static final int VIEW_STATE_SELECTED = 1 << 1; 1347 static final int VIEW_STATE_FOCUSED = 1 << 2; 1348 static final int VIEW_STATE_ENABLED = 1 << 3; 1349 static final int VIEW_STATE_PRESSED = 1 << 4; 1350 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1351 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1352 static final int VIEW_STATE_HOVERED = 1 << 7; 1353 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1354 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1355 1356 static final int[] VIEW_STATE_IDS = new int[] { 1357 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1358 R.attr.state_selected, VIEW_STATE_SELECTED, 1359 R.attr.state_focused, VIEW_STATE_FOCUSED, 1360 R.attr.state_enabled, VIEW_STATE_ENABLED, 1361 R.attr.state_pressed, VIEW_STATE_PRESSED, 1362 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1363 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1364 R.attr.state_hovered, VIEW_STATE_HOVERED, 1365 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1366 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1367 }; 1368 1369 static { 1370 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1371 throw new IllegalStateException( 1372 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1373 } 1374 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1375 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1376 int viewState = R.styleable.ViewDrawableStates[i]; 1377 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1378 if (VIEW_STATE_IDS[j] == viewState) { 1379 orderedIds[i * 2] = viewState; 1380 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1381 } 1382 } 1383 } 1384 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1385 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1386 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1387 int numBits = Integer.bitCount(i); 1388 int[] set = new int[numBits]; 1389 int pos = 0; 1390 for (int j = 0; j < orderedIds.length; j += 2) { 1391 if ((i & orderedIds[j+1]) != 0) { 1392 set[pos++] = orderedIds[j]; 1393 } 1394 } 1395 VIEW_STATE_SETS[i] = set; 1396 } 1397 1398 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1399 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1400 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1401 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1402 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1403 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1404 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1405 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1406 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1407 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1408 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1409 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1410 | VIEW_STATE_FOCUSED]; 1411 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1412 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1414 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1416 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1418 | VIEW_STATE_ENABLED]; 1419 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1421 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1423 | VIEW_STATE_ENABLED]; 1424 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1425 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1426 | VIEW_STATE_ENABLED]; 1427 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1428 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1429 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1430 1431 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1432 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1433 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1434 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1436 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1437 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1438 | VIEW_STATE_PRESSED]; 1439 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1440 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1441 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1443 | VIEW_STATE_PRESSED]; 1444 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1446 | VIEW_STATE_PRESSED]; 1447 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1449 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1450 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1452 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1453 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1454 | VIEW_STATE_PRESSED]; 1455 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1456 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1457 | VIEW_STATE_PRESSED]; 1458 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1459 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1460 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1461 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1463 | VIEW_STATE_PRESSED]; 1464 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1466 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1467 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1468 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1469 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1470 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1471 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1472 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1473 | VIEW_STATE_PRESSED]; 1474 } 1475 1476 /** 1477 * Accessibility event types that are dispatched for text population. 1478 */ 1479 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1480 AccessibilityEvent.TYPE_VIEW_CLICKED 1481 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1482 | AccessibilityEvent.TYPE_VIEW_SELECTED 1483 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1484 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1485 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1486 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1487 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1488 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1489 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1490 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1491 1492 /** 1493 * Temporary Rect currently for use in setBackground(). This will probably 1494 * be extended in the future to hold our own class with more than just 1495 * a Rect. :) 1496 */ 1497 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1498 1499 /** 1500 * Map used to store views' tags. 1501 */ 1502 private SparseArray<Object> mKeyedTags; 1503 1504 /** 1505 * The next available accessiiblity id. 1506 */ 1507 private static int sNextAccessibilityViewId; 1508 1509 /** 1510 * The animation currently associated with this view. 1511 * @hide 1512 */ 1513 protected Animation mCurrentAnimation = null; 1514 1515 /** 1516 * Width as measured during measure pass. 1517 * {@hide} 1518 */ 1519 @ViewDebug.ExportedProperty(category = "measurement") 1520 int mMeasuredWidth; 1521 1522 /** 1523 * Height as measured during measure pass. 1524 * {@hide} 1525 */ 1526 @ViewDebug.ExportedProperty(category = "measurement") 1527 int mMeasuredHeight; 1528 1529 /** 1530 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1531 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1532 * its display list. This flag, used only when hw accelerated, allows us to clear the 1533 * flag while retaining this information until it's needed (at getDisplayList() time and 1534 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1535 * 1536 * {@hide} 1537 */ 1538 boolean mRecreateDisplayList = false; 1539 1540 /** 1541 * The view's identifier. 1542 * {@hide} 1543 * 1544 * @see #setId(int) 1545 * @see #getId() 1546 */ 1547 @ViewDebug.ExportedProperty(resolveId = true) 1548 int mID = NO_ID; 1549 1550 /** 1551 * The stable ID of this view for accessibility purposes. 1552 */ 1553 int mAccessibilityViewId = NO_ID; 1554 1555 /** 1556 * @hide 1557 */ 1558 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1559 1560 /** 1561 * The view's tag. 1562 * {@hide} 1563 * 1564 * @see #setTag(Object) 1565 * @see #getTag() 1566 */ 1567 protected Object mTag; 1568 1569 // for mPrivateFlags: 1570 /** {@hide} */ 1571 static final int WANTS_FOCUS = 0x00000001; 1572 /** {@hide} */ 1573 static final int FOCUSED = 0x00000002; 1574 /** {@hide} */ 1575 static final int SELECTED = 0x00000004; 1576 /** {@hide} */ 1577 static final int IS_ROOT_NAMESPACE = 0x00000008; 1578 /** {@hide} */ 1579 static final int HAS_BOUNDS = 0x00000010; 1580 /** {@hide} */ 1581 static final int DRAWN = 0x00000020; 1582 /** 1583 * When this flag is set, this view is running an animation on behalf of its 1584 * children and should therefore not cancel invalidate requests, even if they 1585 * lie outside of this view's bounds. 1586 * 1587 * {@hide} 1588 */ 1589 static final int DRAW_ANIMATION = 0x00000040; 1590 /** {@hide} */ 1591 static final int SKIP_DRAW = 0x00000080; 1592 /** {@hide} */ 1593 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1594 /** {@hide} */ 1595 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1596 /** {@hide} */ 1597 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1598 /** {@hide} */ 1599 static final int MEASURED_DIMENSION_SET = 0x00000800; 1600 /** {@hide} */ 1601 static final int FORCE_LAYOUT = 0x00001000; 1602 /** {@hide} */ 1603 static final int LAYOUT_REQUIRED = 0x00002000; 1604 1605 private static final int PRESSED = 0x00004000; 1606 1607 /** {@hide} */ 1608 static final int DRAWING_CACHE_VALID = 0x00008000; 1609 /** 1610 * Flag used to indicate that this view should be drawn once more (and only once 1611 * more) after its animation has completed. 1612 * {@hide} 1613 */ 1614 static final int ANIMATION_STARTED = 0x00010000; 1615 1616 private static final int SAVE_STATE_CALLED = 0x00020000; 1617 1618 /** 1619 * Indicates that the View returned true when onSetAlpha() was called and that 1620 * the alpha must be restored. 1621 * {@hide} 1622 */ 1623 static final int ALPHA_SET = 0x00040000; 1624 1625 /** 1626 * Set by {@link #setScrollContainer(boolean)}. 1627 */ 1628 static final int SCROLL_CONTAINER = 0x00080000; 1629 1630 /** 1631 * Set by {@link #setScrollContainer(boolean)}. 1632 */ 1633 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1634 1635 /** 1636 * View flag indicating whether this view was invalidated (fully or partially.) 1637 * 1638 * @hide 1639 */ 1640 static final int DIRTY = 0x00200000; 1641 1642 /** 1643 * View flag indicating whether this view was invalidated by an opaque 1644 * invalidate request. 1645 * 1646 * @hide 1647 */ 1648 static final int DIRTY_OPAQUE = 0x00400000; 1649 1650 /** 1651 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1652 * 1653 * @hide 1654 */ 1655 static final int DIRTY_MASK = 0x00600000; 1656 1657 /** 1658 * Indicates whether the background is opaque. 1659 * 1660 * @hide 1661 */ 1662 static final int OPAQUE_BACKGROUND = 0x00800000; 1663 1664 /** 1665 * Indicates whether the scrollbars are opaque. 1666 * 1667 * @hide 1668 */ 1669 static final int OPAQUE_SCROLLBARS = 0x01000000; 1670 1671 /** 1672 * Indicates whether the view is opaque. 1673 * 1674 * @hide 1675 */ 1676 static final int OPAQUE_MASK = 0x01800000; 1677 1678 /** 1679 * Indicates a prepressed state; 1680 * the short time between ACTION_DOWN and recognizing 1681 * a 'real' press. Prepressed is used to recognize quick taps 1682 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1683 * 1684 * @hide 1685 */ 1686 private static final int PREPRESSED = 0x02000000; 1687 1688 /** 1689 * Indicates whether the view is temporarily detached. 1690 * 1691 * @hide 1692 */ 1693 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1694 1695 /** 1696 * Indicates that we should awaken scroll bars once attached 1697 * 1698 * @hide 1699 */ 1700 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1701 1702 /** 1703 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1704 * @hide 1705 */ 1706 private static final int HOVERED = 0x10000000; 1707 1708 /** 1709 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1710 * for transform operations 1711 * 1712 * @hide 1713 */ 1714 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1715 1716 /** {@hide} */ 1717 static final int ACTIVATED = 0x40000000; 1718 1719 /** 1720 * Indicates that this view was specifically invalidated, not just dirtied because some 1721 * child view was invalidated. The flag is used to determine when we need to recreate 1722 * a view's display list (as opposed to just returning a reference to its existing 1723 * display list). 1724 * 1725 * @hide 1726 */ 1727 static final int INVALIDATED = 0x80000000; 1728 1729 /* Masks for mPrivateFlags2 */ 1730 1731 /** 1732 * Indicates that this view has reported that it can accept the current drag's content. 1733 * Cleared when the drag operation concludes. 1734 * @hide 1735 */ 1736 static final int DRAG_CAN_ACCEPT = 0x00000001; 1737 1738 /** 1739 * Indicates that this view is currently directly under the drag location in a 1740 * drag-and-drop operation involving content that it can accept. Cleared when 1741 * the drag exits the view, or when the drag operation concludes. 1742 * @hide 1743 */ 1744 static final int DRAG_HOVERED = 0x00000002; 1745 1746 /** 1747 * Horizontal layout direction of this view is from Left to Right. 1748 * Use with {@link #setLayoutDirection}. 1749 */ 1750 public static final int LAYOUT_DIRECTION_LTR = 0; 1751 1752 /** 1753 * Horizontal layout direction of this view is from Right to Left. 1754 * Use with {@link #setLayoutDirection}. 1755 */ 1756 public static final int LAYOUT_DIRECTION_RTL = 1; 1757 1758 /** 1759 * Horizontal layout direction of this view is inherited from its parent. 1760 * Use with {@link #setLayoutDirection}. 1761 */ 1762 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1763 1764 /** 1765 * Horizontal layout direction of this view is from deduced from the default language 1766 * script for the locale. Use with {@link #setLayoutDirection}. 1767 */ 1768 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1769 1770 /** 1771 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1772 * @hide 1773 */ 1774 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1775 1776 /** 1777 * Mask for use with private flags indicating bits used for horizontal layout direction. 1778 * @hide 1779 */ 1780 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1781 1782 /** 1783 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1784 * right-to-left direction. 1785 * @hide 1786 */ 1787 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1788 1789 /** 1790 * Indicates whether the view horizontal layout direction has been resolved. 1791 * @hide 1792 */ 1793 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1794 1795 /** 1796 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1797 * @hide 1798 */ 1799 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1800 1801 /* 1802 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1803 * flag value. 1804 * @hide 1805 */ 1806 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1807 LAYOUT_DIRECTION_LTR, 1808 LAYOUT_DIRECTION_RTL, 1809 LAYOUT_DIRECTION_INHERIT, 1810 LAYOUT_DIRECTION_LOCALE 1811 }; 1812 1813 /** 1814 * Default horizontal layout direction. 1815 * @hide 1816 */ 1817 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1818 1819 /** 1820 * Indicates that the view is tracking some sort of transient state 1821 * that the app should not need to be aware of, but that the framework 1822 * should take special care to preserve. 1823 * 1824 * @hide 1825 */ 1826 static final int HAS_TRANSIENT_STATE = 0x00000100; 1827 1828 1829 /** 1830 * Text direction is inherited thru {@link ViewGroup} 1831 */ 1832 public static final int TEXT_DIRECTION_INHERIT = 0; 1833 1834 /** 1835 * Text direction is using "first strong algorithm". The first strong directional character 1836 * determines the paragraph direction. If there is no strong directional character, the 1837 * paragraph direction is the view's resolved layout direction. 1838 */ 1839 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1840 1841 /** 1842 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1843 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1844 * If there are neither, the paragraph direction is the view's resolved layout direction. 1845 */ 1846 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1847 1848 /** 1849 * Text direction is forced to LTR. 1850 */ 1851 public static final int TEXT_DIRECTION_LTR = 3; 1852 1853 /** 1854 * Text direction is forced to RTL. 1855 */ 1856 public static final int TEXT_DIRECTION_RTL = 4; 1857 1858 /** 1859 * Text direction is coming from the system Locale. 1860 */ 1861 public static final int TEXT_DIRECTION_LOCALE = 5; 1862 1863 /** 1864 * Default text direction is inherited 1865 */ 1866 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1867 1868 /** 1869 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1870 * @hide 1871 */ 1872 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1873 1874 /** 1875 * Mask for use with private flags indicating bits used for text direction. 1876 * @hide 1877 */ 1878 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1879 1880 /** 1881 * Array of text direction flags for mapping attribute "textDirection" to correct 1882 * flag value. 1883 * @hide 1884 */ 1885 private static final int[] TEXT_DIRECTION_FLAGS = { 1886 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1887 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1888 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1889 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1890 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1891 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1892 }; 1893 1894 /** 1895 * Indicates whether the view text direction has been resolved. 1896 * @hide 1897 */ 1898 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1899 1900 /** 1901 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1902 * @hide 1903 */ 1904 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1905 1906 /** 1907 * Mask for use with private flags indicating bits used for resolved text direction. 1908 * @hide 1909 */ 1910 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1911 1912 /** 1913 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1914 * @hide 1915 */ 1916 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1917 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1918 1919 /* 1920 * Default text alignment. The text alignment of this View is inherited from its parent. 1921 * Use with {@link #setTextAlignment(int)} 1922 */ 1923 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1924 1925 /** 1926 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1927 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1928 * 1929 * Use with {@link #setTextAlignment(int)} 1930 */ 1931 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1932 1933 /** 1934 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1935 * 1936 * Use with {@link #setTextAlignment(int)} 1937 */ 1938 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1939 1940 /** 1941 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1942 * 1943 * Use with {@link #setTextAlignment(int)} 1944 */ 1945 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 1946 1947 /** 1948 * Center the paragraph, e.g. ALIGN_CENTER. 1949 * 1950 * Use with {@link #setTextAlignment(int)} 1951 */ 1952 public static final int TEXT_ALIGNMENT_CENTER = 4; 1953 1954 /** 1955 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 1956 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 1957 * 1958 * Use with {@link #setTextAlignment(int)} 1959 */ 1960 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 1961 1962 /** 1963 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 1964 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 1965 * 1966 * Use with {@link #setTextAlignment(int)} 1967 */ 1968 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 1969 1970 /** 1971 * Default text alignment is inherited 1972 */ 1973 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 1974 1975 /** 1976 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1977 * @hide 1978 */ 1979 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 1980 1981 /** 1982 * Mask for use with private flags indicating bits used for text alignment. 1983 * @hide 1984 */ 1985 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 1986 1987 /** 1988 * Array of text direction flags for mapping attribute "textAlignment" to correct 1989 * flag value. 1990 * @hide 1991 */ 1992 private static final int[] TEXT_ALIGNMENT_FLAGS = { 1993 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 1994 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 1995 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 1996 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 1997 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 1998 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 1999 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2000 }; 2001 2002 /** 2003 * Indicates whether the view text alignment has been resolved. 2004 * @hide 2005 */ 2006 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2007 2008 /** 2009 * Bit shift to get the resolved text alignment. 2010 * @hide 2011 */ 2012 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2013 2014 /** 2015 * Mask for use with private flags indicating bits used for text alignment. 2016 * @hide 2017 */ 2018 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2019 2020 /** 2021 * Indicates whether if the view text alignment has been resolved to gravity 2022 */ 2023 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2024 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2025 2026 // Accessiblity constants for mPrivateFlags2 2027 2028 /** 2029 * Shift for the bits in {@link #mPrivateFlags2} related to the 2030 * "importantForAccessibility" attribute. 2031 */ 2032 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2033 2034 /** 2035 * Automatically determine whether a view is important for accessibility. 2036 */ 2037 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2038 2039 /** 2040 * The view is important for accessibility. 2041 */ 2042 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2043 2044 /** 2045 * The view is not important for accessibility. 2046 */ 2047 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2048 2049 /** 2050 * The default whether the view is important for accessiblity. 2051 */ 2052 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2053 2054 /** 2055 * Mask for obtainig the bits which specify how to determine 2056 * whether a view is important for accessibility. 2057 */ 2058 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2059 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2060 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2061 2062 /** 2063 * Flag indicating whether a view has accessibility focus. 2064 */ 2065 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2066 2067 /** 2068 * Flag indicating whether a view state for accessibility has changed. 2069 */ 2070 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2071 2072 /** 2073 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2074 * is used to check whether later changes to the view's transform should invalidate the 2075 * view to force the quickReject test to run again. 2076 */ 2077 static final int VIEW_QUICK_REJECTED = 0x10000000; 2078 2079 // There are a couple of flags left in mPrivateFlags2 2080 2081 /* End of masks for mPrivateFlags2 */ 2082 2083 /* Masks for mPrivateFlags3 */ 2084 2085 /** 2086 * Flag indicating that view has a transform animation set on it. This is used to track whether 2087 * an animation is cleared between successive frames, in order to tell the associated 2088 * DisplayList to clear its animation matrix. 2089 */ 2090 static final int VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2091 2092 /** 2093 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2094 * animation is cleared between successive frames, in order to tell the associated 2095 * DisplayList to restore its alpha value. 2096 */ 2097 static final int VIEW_IS_ANIMATING_ALPHA = 0x2; 2098 2099 2100 /* End of masks for mPrivateFlags3 */ 2101 2102 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2103 2104 /** 2105 * Always allow a user to over-scroll this view, provided it is a 2106 * view that can scroll. 2107 * 2108 * @see #getOverScrollMode() 2109 * @see #setOverScrollMode(int) 2110 */ 2111 public static final int OVER_SCROLL_ALWAYS = 0; 2112 2113 /** 2114 * Allow a user to over-scroll this view only if the content is large 2115 * enough to meaningfully scroll, provided it is a view that can scroll. 2116 * 2117 * @see #getOverScrollMode() 2118 * @see #setOverScrollMode(int) 2119 */ 2120 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2121 2122 /** 2123 * Never allow a user to over-scroll this view. 2124 * 2125 * @see #getOverScrollMode() 2126 * @see #setOverScrollMode(int) 2127 */ 2128 public static final int OVER_SCROLL_NEVER = 2; 2129 2130 /** 2131 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2132 * requested the system UI (status bar) to be visible (the default). 2133 * 2134 * @see #setSystemUiVisibility(int) 2135 */ 2136 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2137 2138 /** 2139 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2140 * system UI to enter an unobtrusive "low profile" mode. 2141 * 2142 * <p>This is for use in games, book readers, video players, or any other 2143 * "immersive" application where the usual system chrome is deemed too distracting. 2144 * 2145 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2146 * 2147 * @see #setSystemUiVisibility(int) 2148 */ 2149 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2150 2151 /** 2152 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2153 * system navigation be temporarily hidden. 2154 * 2155 * <p>This is an even less obtrusive state than that called for by 2156 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2157 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2158 * those to disappear. This is useful (in conjunction with the 2159 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2160 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2161 * window flags) for displaying content using every last pixel on the display. 2162 * 2163 * <p>There is a limitation: because navigation controls are so important, the least user 2164 * interaction will cause them to reappear immediately. When this happens, both 2165 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2166 * so that both elements reappear at the same time. 2167 * 2168 * @see #setSystemUiVisibility(int) 2169 */ 2170 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2171 2172 /** 2173 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2174 * into the normal fullscreen mode so that its content can take over the screen 2175 * while still allowing the user to interact with the application. 2176 * 2177 * <p>This has the same visual effect as 2178 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2179 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2180 * meaning that non-critical screen decorations (such as the status bar) will be 2181 * hidden while the user is in the View's window, focusing the experience on 2182 * that content. Unlike the window flag, if you are using ActionBar in 2183 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2184 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2185 * hide the action bar. 2186 * 2187 * <p>This approach to going fullscreen is best used over the window flag when 2188 * it is a transient state -- that is, the application does this at certain 2189 * points in its user interaction where it wants to allow the user to focus 2190 * on content, but not as a continuous state. For situations where the application 2191 * would like to simply stay full screen the entire time (such as a game that 2192 * wants to take over the screen), the 2193 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2194 * is usually a better approach. The state set here will be removed by the system 2195 * in various situations (such as the user moving to another application) like 2196 * the other system UI states. 2197 * 2198 * <p>When using this flag, the application should provide some easy facility 2199 * for the user to go out of it. A common example would be in an e-book 2200 * reader, where tapping on the screen brings back whatever screen and UI 2201 * decorations that had been hidden while the user was immersed in reading 2202 * the book. 2203 * 2204 * @see #setSystemUiVisibility(int) 2205 */ 2206 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2207 2208 /** 2209 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2210 * flags, we would like a stable view of the content insets given to 2211 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2212 * will always represent the worst case that the application can expect 2213 * as a continuous state. In the stock Android UI this is the space for 2214 * the system bar, nav bar, and status bar, but not more transient elements 2215 * such as an input method. 2216 * 2217 * The stable layout your UI sees is based on the system UI modes you can 2218 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2219 * then you will get a stable layout for changes of the 2220 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2221 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2222 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2223 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2224 * with a stable layout. (Note that you should avoid using 2225 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2226 * 2227 * If you have set the window flag {@ WindowManager.LayoutParams#FLAG_FULLSCREEN} 2228 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2229 * then a hidden status bar will be considered a "stable" state for purposes 2230 * here. This allows your UI to continually hide the status bar, while still 2231 * using the system UI flags to hide the action bar while still retaining 2232 * a stable layout. Note that changing the window fullscreen flag will never 2233 * provide a stable layout for a clean transition. 2234 * 2235 * <p>If you are using ActionBar in 2236 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2237 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2238 * insets it adds to those given to the application. 2239 */ 2240 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2241 2242 /** 2243 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2244 * to be layed out as if it has requested 2245 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2246 * allows it to avoid artifacts when switching in and out of that mode, at 2247 * the expense that some of its user interface may be covered by screen 2248 * decorations when they are shown. You can perform layout of your inner 2249 * UI elements to account for the navagation system UI through the 2250 * {@link #fitSystemWindows(Rect)} method. 2251 */ 2252 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2253 2254 /** 2255 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2256 * to be layed out as if it has requested 2257 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2258 * allows it to avoid artifacts when switching in and out of that mode, at 2259 * the expense that some of its user interface may be covered by screen 2260 * decorations when they are shown. You can perform layout of your inner 2261 * UI elements to account for non-fullscreen system UI through the 2262 * {@link #fitSystemWindows(Rect)} method. 2263 */ 2264 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2265 2266 /** 2267 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2268 */ 2269 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2270 2271 /** 2272 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2273 */ 2274 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2275 2276 /** 2277 * @hide 2278 * 2279 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2280 * out of the public fields to keep the undefined bits out of the developer's way. 2281 * 2282 * Flag to make the status bar not expandable. Unless you also 2283 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2284 */ 2285 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2286 2287 /** 2288 * @hide 2289 * 2290 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2291 * out of the public fields to keep the undefined bits out of the developer's way. 2292 * 2293 * Flag to hide notification icons and scrolling ticker text. 2294 */ 2295 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2296 2297 /** 2298 * @hide 2299 * 2300 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2301 * out of the public fields to keep the undefined bits out of the developer's way. 2302 * 2303 * Flag to disable incoming notification alerts. This will not block 2304 * icons, but it will block sound, vibrating and other visual or aural notifications. 2305 */ 2306 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2307 2308 /** 2309 * @hide 2310 * 2311 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2312 * out of the public fields to keep the undefined bits out of the developer's way. 2313 * 2314 * Flag to hide only the scrolling ticker. Note that 2315 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2316 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2317 */ 2318 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2319 2320 /** 2321 * @hide 2322 * 2323 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2324 * out of the public fields to keep the undefined bits out of the developer's way. 2325 * 2326 * Flag to hide the center system info area. 2327 */ 2328 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2329 2330 /** 2331 * @hide 2332 * 2333 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2334 * out of the public fields to keep the undefined bits out of the developer's way. 2335 * 2336 * Flag to hide only the home button. Don't use this 2337 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2338 */ 2339 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2340 2341 /** 2342 * @hide 2343 * 2344 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2345 * out of the public fields to keep the undefined bits out of the developer's way. 2346 * 2347 * Flag to hide only the back button. Don't use this 2348 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2349 */ 2350 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2351 2352 /** 2353 * @hide 2354 * 2355 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2356 * out of the public fields to keep the undefined bits out of the developer's way. 2357 * 2358 * Flag to hide only the clock. You might use this if your activity has 2359 * its own clock making the status bar's clock redundant. 2360 */ 2361 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2362 2363 /** 2364 * @hide 2365 * 2366 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2367 * out of the public fields to keep the undefined bits out of the developer's way. 2368 * 2369 * Flag to hide only the recent apps button. Don't use this 2370 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2371 */ 2372 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2373 2374 /** 2375 * @hide 2376 */ 2377 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2378 2379 /** 2380 * These are the system UI flags that can be cleared by events outside 2381 * of an application. Currently this is just the ability to tap on the 2382 * screen while hiding the navigation bar to have it return. 2383 * @hide 2384 */ 2385 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2386 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2387 | SYSTEM_UI_FLAG_FULLSCREEN; 2388 2389 /** 2390 * Flags that can impact the layout in relation to system UI. 2391 */ 2392 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2393 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2394 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2395 2396 /** 2397 * Find views that render the specified text. 2398 * 2399 * @see #findViewsWithText(ArrayList, CharSequence, int) 2400 */ 2401 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2402 2403 /** 2404 * Find find views that contain the specified content description. 2405 * 2406 * @see #findViewsWithText(ArrayList, CharSequence, int) 2407 */ 2408 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2409 2410 /** 2411 * Find views that contain {@link AccessibilityNodeProvider}. Such 2412 * a View is a root of virtual view hierarchy and may contain the searched 2413 * text. If this flag is set Views with providers are automatically 2414 * added and it is a responsibility of the client to call the APIs of 2415 * the provider to determine whether the virtual tree rooted at this View 2416 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2417 * represeting the virtual views with this text. 2418 * 2419 * @see #findViewsWithText(ArrayList, CharSequence, int) 2420 * 2421 * @hide 2422 */ 2423 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2424 2425 /** 2426 * The undefined cursor position. 2427 */ 2428 private static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2429 2430 /** 2431 * Indicates that the screen has changed state and is now off. 2432 * 2433 * @see #onScreenStateChanged(int) 2434 */ 2435 public static final int SCREEN_STATE_OFF = 0x0; 2436 2437 /** 2438 * Indicates that the screen has changed state and is now on. 2439 * 2440 * @see #onScreenStateChanged(int) 2441 */ 2442 public static final int SCREEN_STATE_ON = 0x1; 2443 2444 /** 2445 * Controls the over-scroll mode for this view. 2446 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2447 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2448 * and {@link #OVER_SCROLL_NEVER}. 2449 */ 2450 private int mOverScrollMode; 2451 2452 /** 2453 * The parent this view is attached to. 2454 * {@hide} 2455 * 2456 * @see #getParent() 2457 */ 2458 protected ViewParent mParent; 2459 2460 /** 2461 * {@hide} 2462 */ 2463 AttachInfo mAttachInfo; 2464 2465 /** 2466 * {@hide} 2467 */ 2468 @ViewDebug.ExportedProperty(flagMapping = { 2469 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2470 name = "FORCE_LAYOUT"), 2471 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2472 name = "LAYOUT_REQUIRED"), 2473 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2474 name = "DRAWING_CACHE_INVALID", outputIf = false), 2475 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2476 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2477 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2478 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2479 }) 2480 int mPrivateFlags; 2481 int mPrivateFlags2; 2482 int mPrivateFlags3; 2483 2484 /** 2485 * This view's request for the visibility of the status bar. 2486 * @hide 2487 */ 2488 @ViewDebug.ExportedProperty(flagMapping = { 2489 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2490 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2491 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2492 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2493 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2494 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2495 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2496 equals = SYSTEM_UI_FLAG_VISIBLE, 2497 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2498 }) 2499 int mSystemUiVisibility; 2500 2501 /** 2502 * Reference count for transient state. 2503 * @see #setHasTransientState(boolean) 2504 */ 2505 int mTransientStateCount = 0; 2506 2507 /** 2508 * Count of how many windows this view has been attached to. 2509 */ 2510 int mWindowAttachCount; 2511 2512 /** 2513 * The layout parameters associated with this view and used by the parent 2514 * {@link android.view.ViewGroup} to determine how this view should be 2515 * laid out. 2516 * {@hide} 2517 */ 2518 protected ViewGroup.LayoutParams mLayoutParams; 2519 2520 /** 2521 * The view flags hold various views states. 2522 * {@hide} 2523 */ 2524 @ViewDebug.ExportedProperty 2525 int mViewFlags; 2526 2527 static class TransformationInfo { 2528 /** 2529 * The transform matrix for the View. This transform is calculated internally 2530 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2531 * is used by default. Do *not* use this variable directly; instead call 2532 * getMatrix(), which will automatically recalculate the matrix if necessary 2533 * to get the correct matrix based on the latest rotation and scale properties. 2534 */ 2535 private final Matrix mMatrix = new Matrix(); 2536 2537 /** 2538 * The transform matrix for the View. This transform is calculated internally 2539 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2540 * is used by default. Do *not* use this variable directly; instead call 2541 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2542 * to get the correct matrix based on the latest rotation and scale properties. 2543 */ 2544 private Matrix mInverseMatrix; 2545 2546 /** 2547 * An internal variable that tracks whether we need to recalculate the 2548 * transform matrix, based on whether the rotation or scaleX/Y properties 2549 * have changed since the matrix was last calculated. 2550 */ 2551 boolean mMatrixDirty = false; 2552 2553 /** 2554 * An internal variable that tracks whether we need to recalculate the 2555 * transform matrix, based on whether the rotation or scaleX/Y properties 2556 * have changed since the matrix was last calculated. 2557 */ 2558 private boolean mInverseMatrixDirty = true; 2559 2560 /** 2561 * A variable that tracks whether we need to recalculate the 2562 * transform matrix, based on whether the rotation or scaleX/Y properties 2563 * have changed since the matrix was last calculated. This variable 2564 * is only valid after a call to updateMatrix() or to a function that 2565 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2566 */ 2567 private boolean mMatrixIsIdentity = true; 2568 2569 /** 2570 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2571 */ 2572 private Camera mCamera = null; 2573 2574 /** 2575 * This matrix is used when computing the matrix for 3D rotations. 2576 */ 2577 private Matrix matrix3D = null; 2578 2579 /** 2580 * These prev values are used to recalculate a centered pivot point when necessary. The 2581 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2582 * set), so thes values are only used then as well. 2583 */ 2584 private int mPrevWidth = -1; 2585 private int mPrevHeight = -1; 2586 2587 /** 2588 * The degrees rotation around the vertical axis through the pivot point. 2589 */ 2590 @ViewDebug.ExportedProperty 2591 float mRotationY = 0f; 2592 2593 /** 2594 * The degrees rotation around the horizontal axis through the pivot point. 2595 */ 2596 @ViewDebug.ExportedProperty 2597 float mRotationX = 0f; 2598 2599 /** 2600 * The degrees rotation around the pivot point. 2601 */ 2602 @ViewDebug.ExportedProperty 2603 float mRotation = 0f; 2604 2605 /** 2606 * The amount of translation of the object away from its left property (post-layout). 2607 */ 2608 @ViewDebug.ExportedProperty 2609 float mTranslationX = 0f; 2610 2611 /** 2612 * The amount of translation of the object away from its top property (post-layout). 2613 */ 2614 @ViewDebug.ExportedProperty 2615 float mTranslationY = 0f; 2616 2617 /** 2618 * The amount of scale in the x direction around the pivot point. A 2619 * value of 1 means no scaling is applied. 2620 */ 2621 @ViewDebug.ExportedProperty 2622 float mScaleX = 1f; 2623 2624 /** 2625 * The amount of scale in the y direction around the pivot point. A 2626 * value of 1 means no scaling is applied. 2627 */ 2628 @ViewDebug.ExportedProperty 2629 float mScaleY = 1f; 2630 2631 /** 2632 * The x location of the point around which the view is rotated and scaled. 2633 */ 2634 @ViewDebug.ExportedProperty 2635 float mPivotX = 0f; 2636 2637 /** 2638 * The y location of the point around which the view is rotated and scaled. 2639 */ 2640 @ViewDebug.ExportedProperty 2641 float mPivotY = 0f; 2642 2643 /** 2644 * The opacity of the View. This is a value from 0 to 1, where 0 means 2645 * completely transparent and 1 means completely opaque. 2646 */ 2647 @ViewDebug.ExportedProperty 2648 float mAlpha = 1f; 2649 } 2650 2651 TransformationInfo mTransformationInfo; 2652 2653 private boolean mLastIsOpaque; 2654 2655 /** 2656 * Convenience value to check for float values that are close enough to zero to be considered 2657 * zero. 2658 */ 2659 private static final float NONZERO_EPSILON = .001f; 2660 2661 /** 2662 * The distance in pixels from the left edge of this view's parent 2663 * to the left edge of this view. 2664 * {@hide} 2665 */ 2666 @ViewDebug.ExportedProperty(category = "layout") 2667 protected int mLeft; 2668 /** 2669 * The distance in pixels from the left edge of this view's parent 2670 * to the right edge of this view. 2671 * {@hide} 2672 */ 2673 @ViewDebug.ExportedProperty(category = "layout") 2674 protected int mRight; 2675 /** 2676 * The distance in pixels from the top edge of this view's parent 2677 * to the top edge of this view. 2678 * {@hide} 2679 */ 2680 @ViewDebug.ExportedProperty(category = "layout") 2681 protected int mTop; 2682 /** 2683 * The distance in pixels from the top edge of this view's parent 2684 * to the bottom edge of this view. 2685 * {@hide} 2686 */ 2687 @ViewDebug.ExportedProperty(category = "layout") 2688 protected int mBottom; 2689 2690 /** 2691 * The offset, in pixels, by which the content of this view is scrolled 2692 * horizontally. 2693 * {@hide} 2694 */ 2695 @ViewDebug.ExportedProperty(category = "scrolling") 2696 protected int mScrollX; 2697 /** 2698 * The offset, in pixels, by which the content of this view is scrolled 2699 * vertically. 2700 * {@hide} 2701 */ 2702 @ViewDebug.ExportedProperty(category = "scrolling") 2703 protected int mScrollY; 2704 2705 /** 2706 * The left padding in pixels, that is the distance in pixels between the 2707 * left edge of this view and the left edge of its content. 2708 * {@hide} 2709 */ 2710 @ViewDebug.ExportedProperty(category = "padding") 2711 protected int mPaddingLeft; 2712 /** 2713 * The right padding in pixels, that is the distance in pixels between the 2714 * right edge of this view and the right edge of its content. 2715 * {@hide} 2716 */ 2717 @ViewDebug.ExportedProperty(category = "padding") 2718 protected int mPaddingRight; 2719 /** 2720 * The top padding in pixels, that is the distance in pixels between the 2721 * top edge of this view and the top edge of its content. 2722 * {@hide} 2723 */ 2724 @ViewDebug.ExportedProperty(category = "padding") 2725 protected int mPaddingTop; 2726 /** 2727 * The bottom padding in pixels, that is the distance in pixels between the 2728 * bottom edge of this view and the bottom edge of its content. 2729 * {@hide} 2730 */ 2731 @ViewDebug.ExportedProperty(category = "padding") 2732 protected int mPaddingBottom; 2733 2734 /** 2735 * The layout insets in pixels, that is the distance in pixels between the 2736 * visible edges of this view its bounds. 2737 */ 2738 private Insets mLayoutInsets; 2739 2740 /** 2741 * Briefly describes the view and is primarily used for accessibility support. 2742 */ 2743 private CharSequence mContentDescription; 2744 2745 /** 2746 * Cache the paddingRight set by the user to append to the scrollbar's size. 2747 * 2748 * @hide 2749 */ 2750 @ViewDebug.ExportedProperty(category = "padding") 2751 protected int mUserPaddingRight; 2752 2753 /** 2754 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2755 * 2756 * @hide 2757 */ 2758 @ViewDebug.ExportedProperty(category = "padding") 2759 protected int mUserPaddingBottom; 2760 2761 /** 2762 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2763 * 2764 * @hide 2765 */ 2766 @ViewDebug.ExportedProperty(category = "padding") 2767 protected int mUserPaddingLeft; 2768 2769 /** 2770 * Cache if the user padding is relative. 2771 * 2772 */ 2773 @ViewDebug.ExportedProperty(category = "padding") 2774 boolean mUserPaddingRelative; 2775 2776 /** 2777 * Cache the paddingStart set by the user to append to the scrollbar's size. 2778 * 2779 */ 2780 @ViewDebug.ExportedProperty(category = "padding") 2781 int mUserPaddingStart; 2782 2783 /** 2784 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2785 * 2786 */ 2787 @ViewDebug.ExportedProperty(category = "padding") 2788 int mUserPaddingEnd; 2789 2790 /** 2791 * @hide 2792 */ 2793 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2794 /** 2795 * @hide 2796 */ 2797 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2798 2799 private Drawable mBackground; 2800 2801 private int mBackgroundResource; 2802 private boolean mBackgroundSizeChanged; 2803 2804 static class ListenerInfo { 2805 /** 2806 * Listener used to dispatch focus change events. 2807 * This field should be made private, so it is hidden from the SDK. 2808 * {@hide} 2809 */ 2810 protected OnFocusChangeListener mOnFocusChangeListener; 2811 2812 /** 2813 * Listeners for layout change events. 2814 */ 2815 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2816 2817 /** 2818 * Listeners for attach events. 2819 */ 2820 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2821 2822 /** 2823 * Listener used to dispatch click events. 2824 * This field should be made private, so it is hidden from the SDK. 2825 * {@hide} 2826 */ 2827 public OnClickListener mOnClickListener; 2828 2829 /** 2830 * Listener used to dispatch long click events. 2831 * This field should be made private, so it is hidden from the SDK. 2832 * {@hide} 2833 */ 2834 protected OnLongClickListener mOnLongClickListener; 2835 2836 /** 2837 * Listener used to build the context menu. 2838 * This field should be made private, so it is hidden from the SDK. 2839 * {@hide} 2840 */ 2841 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2842 2843 private OnKeyListener mOnKeyListener; 2844 2845 private OnTouchListener mOnTouchListener; 2846 2847 private OnHoverListener mOnHoverListener; 2848 2849 private OnGenericMotionListener mOnGenericMotionListener; 2850 2851 private OnDragListener mOnDragListener; 2852 2853 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2854 } 2855 2856 ListenerInfo mListenerInfo; 2857 2858 /** 2859 * The application environment this view lives in. 2860 * This field should be made private, so it is hidden from the SDK. 2861 * {@hide} 2862 */ 2863 protected Context mContext; 2864 2865 private final Resources mResources; 2866 2867 private ScrollabilityCache mScrollCache; 2868 2869 private int[] mDrawableState = null; 2870 2871 /** 2872 * Set to true when drawing cache is enabled and cannot be created. 2873 * 2874 * @hide 2875 */ 2876 public boolean mCachingFailed; 2877 2878 private Bitmap mDrawingCache; 2879 private Bitmap mUnscaledDrawingCache; 2880 private HardwareLayer mHardwareLayer; 2881 DisplayList mDisplayList; 2882 2883 /** 2884 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2885 * the user may specify which view to go to next. 2886 */ 2887 private int mNextFocusLeftId = View.NO_ID; 2888 2889 /** 2890 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2891 * the user may specify which view to go to next. 2892 */ 2893 private int mNextFocusRightId = View.NO_ID; 2894 2895 /** 2896 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2897 * the user may specify which view to go to next. 2898 */ 2899 private int mNextFocusUpId = View.NO_ID; 2900 2901 /** 2902 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2903 * the user may specify which view to go to next. 2904 */ 2905 private int mNextFocusDownId = View.NO_ID; 2906 2907 /** 2908 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2909 * the user may specify which view to go to next. 2910 */ 2911 int mNextFocusForwardId = View.NO_ID; 2912 2913 private CheckForLongPress mPendingCheckForLongPress; 2914 private CheckForTap mPendingCheckForTap = null; 2915 private PerformClick mPerformClick; 2916 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2917 2918 private UnsetPressedState mUnsetPressedState; 2919 2920 /** 2921 * Whether the long press's action has been invoked. The tap's action is invoked on the 2922 * up event while a long press is invoked as soon as the long press duration is reached, so 2923 * a long press could be performed before the tap is checked, in which case the tap's action 2924 * should not be invoked. 2925 */ 2926 private boolean mHasPerformedLongPress; 2927 2928 /** 2929 * The minimum height of the view. We'll try our best to have the height 2930 * of this view to at least this amount. 2931 */ 2932 @ViewDebug.ExportedProperty(category = "measurement") 2933 private int mMinHeight; 2934 2935 /** 2936 * The minimum width of the view. We'll try our best to have the width 2937 * of this view to at least this amount. 2938 */ 2939 @ViewDebug.ExportedProperty(category = "measurement") 2940 private int mMinWidth; 2941 2942 /** 2943 * The delegate to handle touch events that are physically in this view 2944 * but should be handled by another view. 2945 */ 2946 private TouchDelegate mTouchDelegate = null; 2947 2948 /** 2949 * Solid color to use as a background when creating the drawing cache. Enables 2950 * the cache to use 16 bit bitmaps instead of 32 bit. 2951 */ 2952 private int mDrawingCacheBackgroundColor = 0; 2953 2954 /** 2955 * Special tree observer used when mAttachInfo is null. 2956 */ 2957 private ViewTreeObserver mFloatingTreeObserver; 2958 2959 /** 2960 * Cache the touch slop from the context that created the view. 2961 */ 2962 private int mTouchSlop; 2963 2964 /** 2965 * Object that handles automatic animation of view properties. 2966 */ 2967 private ViewPropertyAnimator mAnimator = null; 2968 2969 /** 2970 * Flag indicating that a drag can cross window boundaries. When 2971 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2972 * with this flag set, all visible applications will be able to participate 2973 * in the drag operation and receive the dragged content. 2974 * 2975 * @hide 2976 */ 2977 public static final int DRAG_FLAG_GLOBAL = 1; 2978 2979 /** 2980 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2981 */ 2982 private float mVerticalScrollFactor; 2983 2984 /** 2985 * Position of the vertical scroll bar. 2986 */ 2987 private int mVerticalScrollbarPosition; 2988 2989 /** 2990 * Position the scroll bar at the default position as determined by the system. 2991 */ 2992 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2993 2994 /** 2995 * Position the scroll bar along the left edge. 2996 */ 2997 public static final int SCROLLBAR_POSITION_LEFT = 1; 2998 2999 /** 3000 * Position the scroll bar along the right edge. 3001 */ 3002 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3003 3004 /** 3005 * Indicates that the view does not have a layer. 3006 * 3007 * @see #getLayerType() 3008 * @see #setLayerType(int, android.graphics.Paint) 3009 * @see #LAYER_TYPE_SOFTWARE 3010 * @see #LAYER_TYPE_HARDWARE 3011 */ 3012 public static final int LAYER_TYPE_NONE = 0; 3013 3014 /** 3015 * <p>Indicates that the view has a software layer. A software layer is backed 3016 * by a bitmap and causes the view to be rendered using Android's software 3017 * rendering pipeline, even if hardware acceleration is enabled.</p> 3018 * 3019 * <p>Software layers have various usages:</p> 3020 * <p>When the application is not using hardware acceleration, a software layer 3021 * is useful to apply a specific color filter and/or blending mode and/or 3022 * translucency to a view and all its children.</p> 3023 * <p>When the application is using hardware acceleration, a software layer 3024 * is useful to render drawing primitives not supported by the hardware 3025 * accelerated pipeline. It can also be used to cache a complex view tree 3026 * into a texture and reduce the complexity of drawing operations. For instance, 3027 * when animating a complex view tree with a translation, a software layer can 3028 * be used to render the view tree only once.</p> 3029 * <p>Software layers should be avoided when the affected view tree updates 3030 * often. Every update will require to re-render the software layer, which can 3031 * potentially be slow (particularly when hardware acceleration is turned on 3032 * since the layer will have to be uploaded into a hardware texture after every 3033 * update.)</p> 3034 * 3035 * @see #getLayerType() 3036 * @see #setLayerType(int, android.graphics.Paint) 3037 * @see #LAYER_TYPE_NONE 3038 * @see #LAYER_TYPE_HARDWARE 3039 */ 3040 public static final int LAYER_TYPE_SOFTWARE = 1; 3041 3042 /** 3043 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3044 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3045 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3046 * rendering pipeline, but only if hardware acceleration is turned on for the 3047 * view hierarchy. When hardware acceleration is turned off, hardware layers 3048 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3049 * 3050 * <p>A hardware layer is useful to apply a specific color filter and/or 3051 * blending mode and/or translucency to a view and all its children.</p> 3052 * <p>A hardware layer can be used to cache a complex view tree into a 3053 * texture and reduce the complexity of drawing operations. For instance, 3054 * when animating a complex view tree with a translation, a hardware layer can 3055 * be used to render the view tree only once.</p> 3056 * <p>A hardware layer can also be used to increase the rendering quality when 3057 * rotation transformations are applied on a view. It can also be used to 3058 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3059 * 3060 * @see #getLayerType() 3061 * @see #setLayerType(int, android.graphics.Paint) 3062 * @see #LAYER_TYPE_NONE 3063 * @see #LAYER_TYPE_SOFTWARE 3064 */ 3065 public static final int LAYER_TYPE_HARDWARE = 2; 3066 3067 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3068 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3069 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3070 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3071 }) 3072 int mLayerType = LAYER_TYPE_NONE; 3073 Paint mLayerPaint; 3074 Rect mLocalDirtyRect; 3075 3076 /** 3077 * Set to true when the view is sending hover accessibility events because it 3078 * is the innermost hovered view. 3079 */ 3080 private boolean mSendingHoverAccessibilityEvents; 3081 3082 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3083 3084 /** 3085 * Simple constructor to use when creating a view from code. 3086 * 3087 * @param context The Context the view is running in, through which it can 3088 * access the current theme, resources, etc. 3089 */ 3090 public View(Context context) { 3091 mContext = context; 3092 mResources = context != null ? context.getResources() : null; 3093 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3094 // Set layout and text direction defaults 3095 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3096 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3097 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3098 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3099 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3100 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3101 mUserPaddingStart = -1; 3102 mUserPaddingEnd = -1; 3103 mUserPaddingRelative = false; 3104 } 3105 3106 /** 3107 * Delegate for injecting accessiblity functionality. 3108 */ 3109 AccessibilityDelegate mAccessibilityDelegate; 3110 3111 /** 3112 * Consistency verifier for debugging purposes. 3113 * @hide 3114 */ 3115 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3116 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3117 new InputEventConsistencyVerifier(this, 0) : null; 3118 3119 /** 3120 * Constructor that is called when inflating a view from XML. This is called 3121 * when a view is being constructed from an XML file, supplying attributes 3122 * that were specified in the XML file. This version uses a default style of 3123 * 0, so the only attribute values applied are those in the Context's Theme 3124 * and the given AttributeSet. 3125 * 3126 * <p> 3127 * The method onFinishInflate() will be called after all children have been 3128 * added. 3129 * 3130 * @param context The Context the view is running in, through which it can 3131 * access the current theme, resources, etc. 3132 * @param attrs The attributes of the XML tag that is inflating the view. 3133 * @see #View(Context, AttributeSet, int) 3134 */ 3135 public View(Context context, AttributeSet attrs) { 3136 this(context, attrs, 0); 3137 } 3138 3139 /** 3140 * Perform inflation from XML and apply a class-specific base style. This 3141 * constructor of View allows subclasses to use their own base style when 3142 * they are inflating. For example, a Button class's constructor would call 3143 * this version of the super class constructor and supply 3144 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3145 * the theme's button style to modify all of the base view attributes (in 3146 * particular its background) as well as the Button class's attributes. 3147 * 3148 * @param context The Context the view is running in, through which it can 3149 * access the current theme, resources, etc. 3150 * @param attrs The attributes of the XML tag that is inflating the view. 3151 * @param defStyle The default style to apply to this view. If 0, no style 3152 * will be applied (beyond what is included in the theme). This may 3153 * either be an attribute resource, whose value will be retrieved 3154 * from the current theme, or an explicit style resource. 3155 * @see #View(Context, AttributeSet) 3156 */ 3157 public View(Context context, AttributeSet attrs, int defStyle) { 3158 this(context); 3159 3160 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3161 defStyle, 0); 3162 3163 Drawable background = null; 3164 3165 int leftPadding = -1; 3166 int topPadding = -1; 3167 int rightPadding = -1; 3168 int bottomPadding = -1; 3169 int startPadding = -1; 3170 int endPadding = -1; 3171 3172 int padding = -1; 3173 3174 int viewFlagValues = 0; 3175 int viewFlagMasks = 0; 3176 3177 boolean setScrollContainer = false; 3178 3179 int x = 0; 3180 int y = 0; 3181 3182 float tx = 0; 3183 float ty = 0; 3184 float rotation = 0; 3185 float rotationX = 0; 3186 float rotationY = 0; 3187 float sx = 1f; 3188 float sy = 1f; 3189 boolean transformSet = false; 3190 3191 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3192 3193 int overScrollMode = mOverScrollMode; 3194 final int N = a.getIndexCount(); 3195 for (int i = 0; i < N; i++) { 3196 int attr = a.getIndex(i); 3197 switch (attr) { 3198 case com.android.internal.R.styleable.View_background: 3199 background = a.getDrawable(attr); 3200 break; 3201 case com.android.internal.R.styleable.View_padding: 3202 padding = a.getDimensionPixelSize(attr, -1); 3203 break; 3204 case com.android.internal.R.styleable.View_paddingLeft: 3205 leftPadding = a.getDimensionPixelSize(attr, -1); 3206 break; 3207 case com.android.internal.R.styleable.View_paddingTop: 3208 topPadding = a.getDimensionPixelSize(attr, -1); 3209 break; 3210 case com.android.internal.R.styleable.View_paddingRight: 3211 rightPadding = a.getDimensionPixelSize(attr, -1); 3212 break; 3213 case com.android.internal.R.styleable.View_paddingBottom: 3214 bottomPadding = a.getDimensionPixelSize(attr, -1); 3215 break; 3216 case com.android.internal.R.styleable.View_paddingStart: 3217 startPadding = a.getDimensionPixelSize(attr, -1); 3218 break; 3219 case com.android.internal.R.styleable.View_paddingEnd: 3220 endPadding = a.getDimensionPixelSize(attr, -1); 3221 break; 3222 case com.android.internal.R.styleable.View_scrollX: 3223 x = a.getDimensionPixelOffset(attr, 0); 3224 break; 3225 case com.android.internal.R.styleable.View_scrollY: 3226 y = a.getDimensionPixelOffset(attr, 0); 3227 break; 3228 case com.android.internal.R.styleable.View_alpha: 3229 setAlpha(a.getFloat(attr, 1f)); 3230 break; 3231 case com.android.internal.R.styleable.View_transformPivotX: 3232 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3233 break; 3234 case com.android.internal.R.styleable.View_transformPivotY: 3235 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3236 break; 3237 case com.android.internal.R.styleable.View_translationX: 3238 tx = a.getDimensionPixelOffset(attr, 0); 3239 transformSet = true; 3240 break; 3241 case com.android.internal.R.styleable.View_translationY: 3242 ty = a.getDimensionPixelOffset(attr, 0); 3243 transformSet = true; 3244 break; 3245 case com.android.internal.R.styleable.View_rotation: 3246 rotation = a.getFloat(attr, 0); 3247 transformSet = true; 3248 break; 3249 case com.android.internal.R.styleable.View_rotationX: 3250 rotationX = a.getFloat(attr, 0); 3251 transformSet = true; 3252 break; 3253 case com.android.internal.R.styleable.View_rotationY: 3254 rotationY = a.getFloat(attr, 0); 3255 transformSet = true; 3256 break; 3257 case com.android.internal.R.styleable.View_scaleX: 3258 sx = a.getFloat(attr, 1f); 3259 transformSet = true; 3260 break; 3261 case com.android.internal.R.styleable.View_scaleY: 3262 sy = a.getFloat(attr, 1f); 3263 transformSet = true; 3264 break; 3265 case com.android.internal.R.styleable.View_id: 3266 mID = a.getResourceId(attr, NO_ID); 3267 break; 3268 case com.android.internal.R.styleable.View_tag: 3269 mTag = a.getText(attr); 3270 break; 3271 case com.android.internal.R.styleable.View_fitsSystemWindows: 3272 if (a.getBoolean(attr, false)) { 3273 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3274 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3275 } 3276 break; 3277 case com.android.internal.R.styleable.View_focusable: 3278 if (a.getBoolean(attr, false)) { 3279 viewFlagValues |= FOCUSABLE; 3280 viewFlagMasks |= FOCUSABLE_MASK; 3281 } 3282 break; 3283 case com.android.internal.R.styleable.View_focusableInTouchMode: 3284 if (a.getBoolean(attr, false)) { 3285 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3286 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3287 } 3288 break; 3289 case com.android.internal.R.styleable.View_clickable: 3290 if (a.getBoolean(attr, false)) { 3291 viewFlagValues |= CLICKABLE; 3292 viewFlagMasks |= CLICKABLE; 3293 } 3294 break; 3295 case com.android.internal.R.styleable.View_longClickable: 3296 if (a.getBoolean(attr, false)) { 3297 viewFlagValues |= LONG_CLICKABLE; 3298 viewFlagMasks |= LONG_CLICKABLE; 3299 } 3300 break; 3301 case com.android.internal.R.styleable.View_saveEnabled: 3302 if (!a.getBoolean(attr, true)) { 3303 viewFlagValues |= SAVE_DISABLED; 3304 viewFlagMasks |= SAVE_DISABLED_MASK; 3305 } 3306 break; 3307 case com.android.internal.R.styleable.View_duplicateParentState: 3308 if (a.getBoolean(attr, false)) { 3309 viewFlagValues |= DUPLICATE_PARENT_STATE; 3310 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3311 } 3312 break; 3313 case com.android.internal.R.styleable.View_visibility: 3314 final int visibility = a.getInt(attr, 0); 3315 if (visibility != 0) { 3316 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3317 viewFlagMasks |= VISIBILITY_MASK; 3318 } 3319 break; 3320 case com.android.internal.R.styleable.View_layoutDirection: 3321 // Clear any layout direction flags (included resolved bits) already set 3322 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3323 // Set the layout direction flags depending on the value of the attribute 3324 final int layoutDirection = a.getInt(attr, -1); 3325 final int value = (layoutDirection != -1) ? 3326 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3327 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3328 break; 3329 case com.android.internal.R.styleable.View_drawingCacheQuality: 3330 final int cacheQuality = a.getInt(attr, 0); 3331 if (cacheQuality != 0) { 3332 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3333 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3334 } 3335 break; 3336 case com.android.internal.R.styleable.View_contentDescription: 3337 setContentDescription(a.getString(attr)); 3338 break; 3339 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3340 if (!a.getBoolean(attr, true)) { 3341 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3342 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3343 } 3344 break; 3345 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3346 if (!a.getBoolean(attr, true)) { 3347 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3348 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3349 } 3350 break; 3351 case R.styleable.View_scrollbars: 3352 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3353 if (scrollbars != SCROLLBARS_NONE) { 3354 viewFlagValues |= scrollbars; 3355 viewFlagMasks |= SCROLLBARS_MASK; 3356 initializeScrollbars(a); 3357 } 3358 break; 3359 //noinspection deprecation 3360 case R.styleable.View_fadingEdge: 3361 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3362 // Ignore the attribute starting with ICS 3363 break; 3364 } 3365 // With builds < ICS, fall through and apply fading edges 3366 case R.styleable.View_requiresFadingEdge: 3367 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3368 if (fadingEdge != FADING_EDGE_NONE) { 3369 viewFlagValues |= fadingEdge; 3370 viewFlagMasks |= FADING_EDGE_MASK; 3371 initializeFadingEdge(a); 3372 } 3373 break; 3374 case R.styleable.View_scrollbarStyle: 3375 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3376 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3377 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3378 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3379 } 3380 break; 3381 case R.styleable.View_isScrollContainer: 3382 setScrollContainer = true; 3383 if (a.getBoolean(attr, false)) { 3384 setScrollContainer(true); 3385 } 3386 break; 3387 case com.android.internal.R.styleable.View_keepScreenOn: 3388 if (a.getBoolean(attr, false)) { 3389 viewFlagValues |= KEEP_SCREEN_ON; 3390 viewFlagMasks |= KEEP_SCREEN_ON; 3391 } 3392 break; 3393 case R.styleable.View_filterTouchesWhenObscured: 3394 if (a.getBoolean(attr, false)) { 3395 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3396 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3397 } 3398 break; 3399 case R.styleable.View_nextFocusLeft: 3400 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3401 break; 3402 case R.styleable.View_nextFocusRight: 3403 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3404 break; 3405 case R.styleable.View_nextFocusUp: 3406 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3407 break; 3408 case R.styleable.View_nextFocusDown: 3409 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3410 break; 3411 case R.styleable.View_nextFocusForward: 3412 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3413 break; 3414 case R.styleable.View_minWidth: 3415 mMinWidth = a.getDimensionPixelSize(attr, 0); 3416 break; 3417 case R.styleable.View_minHeight: 3418 mMinHeight = a.getDimensionPixelSize(attr, 0); 3419 break; 3420 case R.styleable.View_onClick: 3421 if (context.isRestricted()) { 3422 throw new IllegalStateException("The android:onClick attribute cannot " 3423 + "be used within a restricted context"); 3424 } 3425 3426 final String handlerName = a.getString(attr); 3427 if (handlerName != null) { 3428 setOnClickListener(new OnClickListener() { 3429 private Method mHandler; 3430 3431 public void onClick(View v) { 3432 if (mHandler == null) { 3433 try { 3434 mHandler = getContext().getClass().getMethod(handlerName, 3435 View.class); 3436 } catch (NoSuchMethodException e) { 3437 int id = getId(); 3438 String idText = id == NO_ID ? "" : " with id '" 3439 + getContext().getResources().getResourceEntryName( 3440 id) + "'"; 3441 throw new IllegalStateException("Could not find a method " + 3442 handlerName + "(View) in the activity " 3443 + getContext().getClass() + " for onClick handler" 3444 + " on view " + View.this.getClass() + idText, e); 3445 } 3446 } 3447 3448 try { 3449 mHandler.invoke(getContext(), View.this); 3450 } catch (IllegalAccessException e) { 3451 throw new IllegalStateException("Could not execute non " 3452 + "public method of the activity", e); 3453 } catch (InvocationTargetException e) { 3454 throw new IllegalStateException("Could not execute " 3455 + "method of the activity", e); 3456 } 3457 } 3458 }); 3459 } 3460 break; 3461 case R.styleable.View_overScrollMode: 3462 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3463 break; 3464 case R.styleable.View_verticalScrollbarPosition: 3465 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3466 break; 3467 case R.styleable.View_layerType: 3468 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3469 break; 3470 case R.styleable.View_textDirection: 3471 // Clear any text direction flag already set 3472 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3473 // Set the text direction flags depending on the value of the attribute 3474 final int textDirection = a.getInt(attr, -1); 3475 if (textDirection != -1) { 3476 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3477 } 3478 break; 3479 case R.styleable.View_textAlignment: 3480 // Clear any text alignment flag already set 3481 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3482 // Set the text alignment flag depending on the value of the attribute 3483 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3484 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3485 break; 3486 case R.styleable.View_importantForAccessibility: 3487 setImportantForAccessibility(a.getInt(attr, 3488 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3489 break; 3490 } 3491 } 3492 3493 a.recycle(); 3494 3495 setOverScrollMode(overScrollMode); 3496 3497 if (background != null) { 3498 setBackground(background); 3499 } 3500 3501 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3502 // layout direction). Those cached values will be used later during padding resolution. 3503 mUserPaddingStart = startPadding; 3504 mUserPaddingEnd = endPadding; 3505 3506 updateUserPaddingRelative(); 3507 3508 if (padding >= 0) { 3509 leftPadding = padding; 3510 topPadding = padding; 3511 rightPadding = padding; 3512 bottomPadding = padding; 3513 } 3514 3515 // If the user specified the padding (either with android:padding or 3516 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3517 // use the default padding or the padding from the background drawable 3518 // (stored at this point in mPadding*) 3519 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3520 topPadding >= 0 ? topPadding : mPaddingTop, 3521 rightPadding >= 0 ? rightPadding : mPaddingRight, 3522 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3523 3524 if (viewFlagMasks != 0) { 3525 setFlags(viewFlagValues, viewFlagMasks); 3526 } 3527 3528 // Needs to be called after mViewFlags is set 3529 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3530 recomputePadding(); 3531 } 3532 3533 if (x != 0 || y != 0) { 3534 scrollTo(x, y); 3535 } 3536 3537 if (transformSet) { 3538 setTranslationX(tx); 3539 setTranslationY(ty); 3540 setRotation(rotation); 3541 setRotationX(rotationX); 3542 setRotationY(rotationY); 3543 setScaleX(sx); 3544 setScaleY(sy); 3545 } 3546 3547 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3548 setScrollContainer(true); 3549 } 3550 3551 computeOpaqueFlags(); 3552 } 3553 3554 private void updateUserPaddingRelative() { 3555 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3556 } 3557 3558 /** 3559 * Non-public constructor for use in testing 3560 */ 3561 View() { 3562 mResources = null; 3563 } 3564 3565 /** 3566 * <p> 3567 * Initializes the fading edges from a given set of styled attributes. This 3568 * method should be called by subclasses that need fading edges and when an 3569 * instance of these subclasses is created programmatically rather than 3570 * being inflated from XML. This method is automatically called when the XML 3571 * is inflated. 3572 * </p> 3573 * 3574 * @param a the styled attributes set to initialize the fading edges from 3575 */ 3576 protected void initializeFadingEdge(TypedArray a) { 3577 initScrollCache(); 3578 3579 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3580 R.styleable.View_fadingEdgeLength, 3581 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3582 } 3583 3584 /** 3585 * Returns the size of the vertical faded edges used to indicate that more 3586 * content in this view is visible. 3587 * 3588 * @return The size in pixels of the vertical faded edge or 0 if vertical 3589 * faded edges are not enabled for this view. 3590 * @attr ref android.R.styleable#View_fadingEdgeLength 3591 */ 3592 public int getVerticalFadingEdgeLength() { 3593 if (isVerticalFadingEdgeEnabled()) { 3594 ScrollabilityCache cache = mScrollCache; 3595 if (cache != null) { 3596 return cache.fadingEdgeLength; 3597 } 3598 } 3599 return 0; 3600 } 3601 3602 /** 3603 * Set the size of the faded edge used to indicate that more content in this 3604 * view is available. Will not change whether the fading edge is enabled; use 3605 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3606 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3607 * for the vertical or horizontal fading edges. 3608 * 3609 * @param length The size in pixels of the faded edge used to indicate that more 3610 * content in this view is visible. 3611 */ 3612 public void setFadingEdgeLength(int length) { 3613 initScrollCache(); 3614 mScrollCache.fadingEdgeLength = length; 3615 } 3616 3617 /** 3618 * Returns the size of the horizontal faded edges used to indicate that more 3619 * content in this view is visible. 3620 * 3621 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3622 * faded edges are not enabled for this view. 3623 * @attr ref android.R.styleable#View_fadingEdgeLength 3624 */ 3625 public int getHorizontalFadingEdgeLength() { 3626 if (isHorizontalFadingEdgeEnabled()) { 3627 ScrollabilityCache cache = mScrollCache; 3628 if (cache != null) { 3629 return cache.fadingEdgeLength; 3630 } 3631 } 3632 return 0; 3633 } 3634 3635 /** 3636 * Returns the width of the vertical scrollbar. 3637 * 3638 * @return The width in pixels of the vertical scrollbar or 0 if there 3639 * is no vertical scrollbar. 3640 */ 3641 public int getVerticalScrollbarWidth() { 3642 ScrollabilityCache cache = mScrollCache; 3643 if (cache != null) { 3644 ScrollBarDrawable scrollBar = cache.scrollBar; 3645 if (scrollBar != null) { 3646 int size = scrollBar.getSize(true); 3647 if (size <= 0) { 3648 size = cache.scrollBarSize; 3649 } 3650 return size; 3651 } 3652 return 0; 3653 } 3654 return 0; 3655 } 3656 3657 /** 3658 * Returns the height of the horizontal scrollbar. 3659 * 3660 * @return The height in pixels of the horizontal scrollbar or 0 if 3661 * there is no horizontal scrollbar. 3662 */ 3663 protected int getHorizontalScrollbarHeight() { 3664 ScrollabilityCache cache = mScrollCache; 3665 if (cache != null) { 3666 ScrollBarDrawable scrollBar = cache.scrollBar; 3667 if (scrollBar != null) { 3668 int size = scrollBar.getSize(false); 3669 if (size <= 0) { 3670 size = cache.scrollBarSize; 3671 } 3672 return size; 3673 } 3674 return 0; 3675 } 3676 return 0; 3677 } 3678 3679 /** 3680 * <p> 3681 * Initializes the scrollbars from a given set of styled attributes. This 3682 * method should be called by subclasses that need scrollbars and when an 3683 * instance of these subclasses is created programmatically rather than 3684 * being inflated from XML. This method is automatically called when the XML 3685 * is inflated. 3686 * </p> 3687 * 3688 * @param a the styled attributes set to initialize the scrollbars from 3689 */ 3690 protected void initializeScrollbars(TypedArray a) { 3691 initScrollCache(); 3692 3693 final ScrollabilityCache scrollabilityCache = mScrollCache; 3694 3695 if (scrollabilityCache.scrollBar == null) { 3696 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3697 } 3698 3699 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3700 3701 if (!fadeScrollbars) { 3702 scrollabilityCache.state = ScrollabilityCache.ON; 3703 } 3704 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3705 3706 3707 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3708 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3709 .getScrollBarFadeDuration()); 3710 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3711 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3712 ViewConfiguration.getScrollDefaultDelay()); 3713 3714 3715 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3716 com.android.internal.R.styleable.View_scrollbarSize, 3717 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3718 3719 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3720 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3721 3722 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3723 if (thumb != null) { 3724 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3725 } 3726 3727 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3728 false); 3729 if (alwaysDraw) { 3730 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3731 } 3732 3733 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3734 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3735 3736 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3737 if (thumb != null) { 3738 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3739 } 3740 3741 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3742 false); 3743 if (alwaysDraw) { 3744 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3745 } 3746 3747 // Apply layout direction to the new Drawables if needed 3748 final int layoutDirection = getResolvedLayoutDirection(); 3749 if (track != null) { 3750 track.setLayoutDirection(layoutDirection); 3751 } 3752 if (thumb != null) { 3753 thumb.setLayoutDirection(layoutDirection); 3754 } 3755 3756 // Re-apply user/background padding so that scrollbar(s) get added 3757 resolvePadding(); 3758 } 3759 3760 /** 3761 * <p> 3762 * Initalizes the scrollability cache if necessary. 3763 * </p> 3764 */ 3765 private void initScrollCache() { 3766 if (mScrollCache == null) { 3767 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3768 } 3769 } 3770 3771 private ScrollabilityCache getScrollCache() { 3772 initScrollCache(); 3773 return mScrollCache; 3774 } 3775 3776 /** 3777 * Set the position of the vertical scroll bar. Should be one of 3778 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3779 * {@link #SCROLLBAR_POSITION_RIGHT}. 3780 * 3781 * @param position Where the vertical scroll bar should be positioned. 3782 */ 3783 public void setVerticalScrollbarPosition(int position) { 3784 if (mVerticalScrollbarPosition != position) { 3785 mVerticalScrollbarPosition = position; 3786 computeOpaqueFlags(); 3787 resolvePadding(); 3788 } 3789 } 3790 3791 /** 3792 * @return The position where the vertical scroll bar will show, if applicable. 3793 * @see #setVerticalScrollbarPosition(int) 3794 */ 3795 public int getVerticalScrollbarPosition() { 3796 return mVerticalScrollbarPosition; 3797 } 3798 3799 ListenerInfo getListenerInfo() { 3800 if (mListenerInfo != null) { 3801 return mListenerInfo; 3802 } 3803 mListenerInfo = new ListenerInfo(); 3804 return mListenerInfo; 3805 } 3806 3807 /** 3808 * Register a callback to be invoked when focus of this view changed. 3809 * 3810 * @param l The callback that will run. 3811 */ 3812 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3813 getListenerInfo().mOnFocusChangeListener = l; 3814 } 3815 3816 /** 3817 * Add a listener that will be called when the bounds of the view change due to 3818 * layout processing. 3819 * 3820 * @param listener The listener that will be called when layout bounds change. 3821 */ 3822 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3823 ListenerInfo li = getListenerInfo(); 3824 if (li.mOnLayoutChangeListeners == null) { 3825 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3826 } 3827 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3828 li.mOnLayoutChangeListeners.add(listener); 3829 } 3830 } 3831 3832 /** 3833 * Remove a listener for layout changes. 3834 * 3835 * @param listener The listener for layout bounds change. 3836 */ 3837 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3838 ListenerInfo li = mListenerInfo; 3839 if (li == null || li.mOnLayoutChangeListeners == null) { 3840 return; 3841 } 3842 li.mOnLayoutChangeListeners.remove(listener); 3843 } 3844 3845 /** 3846 * Add a listener for attach state changes. 3847 * 3848 * This listener will be called whenever this view is attached or detached 3849 * from a window. Remove the listener using 3850 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3851 * 3852 * @param listener Listener to attach 3853 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3854 */ 3855 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3856 ListenerInfo li = getListenerInfo(); 3857 if (li.mOnAttachStateChangeListeners == null) { 3858 li.mOnAttachStateChangeListeners 3859 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3860 } 3861 li.mOnAttachStateChangeListeners.add(listener); 3862 } 3863 3864 /** 3865 * Remove a listener for attach state changes. The listener will receive no further 3866 * notification of window attach/detach events. 3867 * 3868 * @param listener Listener to remove 3869 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3870 */ 3871 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3872 ListenerInfo li = mListenerInfo; 3873 if (li == null || li.mOnAttachStateChangeListeners == null) { 3874 return; 3875 } 3876 li.mOnAttachStateChangeListeners.remove(listener); 3877 } 3878 3879 /** 3880 * Returns the focus-change callback registered for this view. 3881 * 3882 * @return The callback, or null if one is not registered. 3883 */ 3884 public OnFocusChangeListener getOnFocusChangeListener() { 3885 ListenerInfo li = mListenerInfo; 3886 return li != null ? li.mOnFocusChangeListener : null; 3887 } 3888 3889 /** 3890 * Register a callback to be invoked when this view is clicked. If this view is not 3891 * clickable, it becomes clickable. 3892 * 3893 * @param l The callback that will run 3894 * 3895 * @see #setClickable(boolean) 3896 */ 3897 public void setOnClickListener(OnClickListener l) { 3898 if (!isClickable()) { 3899 setClickable(true); 3900 } 3901 getListenerInfo().mOnClickListener = l; 3902 } 3903 3904 /** 3905 * Return whether this view has an attached OnClickListener. Returns 3906 * true if there is a listener, false if there is none. 3907 */ 3908 public boolean hasOnClickListeners() { 3909 ListenerInfo li = mListenerInfo; 3910 return (li != null && li.mOnClickListener != null); 3911 } 3912 3913 /** 3914 * Register a callback to be invoked when this view is clicked and held. If this view is not 3915 * long clickable, it becomes long clickable. 3916 * 3917 * @param l The callback that will run 3918 * 3919 * @see #setLongClickable(boolean) 3920 */ 3921 public void setOnLongClickListener(OnLongClickListener l) { 3922 if (!isLongClickable()) { 3923 setLongClickable(true); 3924 } 3925 getListenerInfo().mOnLongClickListener = l; 3926 } 3927 3928 /** 3929 * Register a callback to be invoked when the context menu for this view is 3930 * being built. If this view is not long clickable, it becomes long clickable. 3931 * 3932 * @param l The callback that will run 3933 * 3934 */ 3935 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3936 if (!isLongClickable()) { 3937 setLongClickable(true); 3938 } 3939 getListenerInfo().mOnCreateContextMenuListener = l; 3940 } 3941 3942 /** 3943 * Call this view's OnClickListener, if it is defined. Performs all normal 3944 * actions associated with clicking: reporting accessibility event, playing 3945 * a sound, etc. 3946 * 3947 * @return True there was an assigned OnClickListener that was called, false 3948 * otherwise is returned. 3949 */ 3950 public boolean performClick() { 3951 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3952 3953 ListenerInfo li = mListenerInfo; 3954 if (li != null && li.mOnClickListener != null) { 3955 playSoundEffect(SoundEffectConstants.CLICK); 3956 li.mOnClickListener.onClick(this); 3957 return true; 3958 } 3959 3960 return false; 3961 } 3962 3963 /** 3964 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3965 * this only calls the listener, and does not do any associated clicking 3966 * actions like reporting an accessibility event. 3967 * 3968 * @return True there was an assigned OnClickListener that was called, false 3969 * otherwise is returned. 3970 */ 3971 public boolean callOnClick() { 3972 ListenerInfo li = mListenerInfo; 3973 if (li != null && li.mOnClickListener != null) { 3974 li.mOnClickListener.onClick(this); 3975 return true; 3976 } 3977 return false; 3978 } 3979 3980 /** 3981 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3982 * OnLongClickListener did not consume the event. 3983 * 3984 * @return True if one of the above receivers consumed the event, false otherwise. 3985 */ 3986 public boolean performLongClick() { 3987 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3988 3989 boolean handled = false; 3990 ListenerInfo li = mListenerInfo; 3991 if (li != null && li.mOnLongClickListener != null) { 3992 handled = li.mOnLongClickListener.onLongClick(View.this); 3993 } 3994 if (!handled) { 3995 handled = showContextMenu(); 3996 } 3997 if (handled) { 3998 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3999 } 4000 return handled; 4001 } 4002 4003 /** 4004 * Performs button-related actions during a touch down event. 4005 * 4006 * @param event The event. 4007 * @return True if the down was consumed. 4008 * 4009 * @hide 4010 */ 4011 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4012 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4013 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4014 return true; 4015 } 4016 } 4017 return false; 4018 } 4019 4020 /** 4021 * Bring up the context menu for this view. 4022 * 4023 * @return Whether a context menu was displayed. 4024 */ 4025 public boolean showContextMenu() { 4026 return getParent().showContextMenuForChild(this); 4027 } 4028 4029 /** 4030 * Bring up the context menu for this view, referring to the item under the specified point. 4031 * 4032 * @param x The referenced x coordinate. 4033 * @param y The referenced y coordinate. 4034 * @param metaState The keyboard modifiers that were pressed. 4035 * @return Whether a context menu was displayed. 4036 * 4037 * @hide 4038 */ 4039 public boolean showContextMenu(float x, float y, int metaState) { 4040 return showContextMenu(); 4041 } 4042 4043 /** 4044 * Start an action mode. 4045 * 4046 * @param callback Callback that will control the lifecycle of the action mode 4047 * @return The new action mode if it is started, null otherwise 4048 * 4049 * @see ActionMode 4050 */ 4051 public ActionMode startActionMode(ActionMode.Callback callback) { 4052 ViewParent parent = getParent(); 4053 if (parent == null) return null; 4054 return parent.startActionModeForChild(this, callback); 4055 } 4056 4057 /** 4058 * Register a callback to be invoked when a hardware key is pressed in this view. 4059 * Key presses in software input methods will generally not trigger the methods of 4060 * this listener. 4061 * @param l the key listener to attach to this view 4062 */ 4063 public void setOnKeyListener(OnKeyListener l) { 4064 getListenerInfo().mOnKeyListener = l; 4065 } 4066 4067 /** 4068 * Register a callback to be invoked when a touch event is sent to this view. 4069 * @param l the touch listener to attach to this view 4070 */ 4071 public void setOnTouchListener(OnTouchListener l) { 4072 getListenerInfo().mOnTouchListener = l; 4073 } 4074 4075 /** 4076 * Register a callback to be invoked when a generic motion event is sent to this view. 4077 * @param l the generic motion listener to attach to this view 4078 */ 4079 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4080 getListenerInfo().mOnGenericMotionListener = l; 4081 } 4082 4083 /** 4084 * Register a callback to be invoked when a hover event is sent to this view. 4085 * @param l the hover listener to attach to this view 4086 */ 4087 public void setOnHoverListener(OnHoverListener l) { 4088 getListenerInfo().mOnHoverListener = l; 4089 } 4090 4091 /** 4092 * Register a drag event listener callback object for this View. The parameter is 4093 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4094 * View, the system calls the 4095 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4096 * @param l An implementation of {@link android.view.View.OnDragListener}. 4097 */ 4098 public void setOnDragListener(OnDragListener l) { 4099 getListenerInfo().mOnDragListener = l; 4100 } 4101 4102 /** 4103 * Give this view focus. This will cause 4104 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4105 * 4106 * Note: this does not check whether this {@link View} should get focus, it just 4107 * gives it focus no matter what. It should only be called internally by framework 4108 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4109 * 4110 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4111 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4112 * focus moved when requestFocus() is called. It may not always 4113 * apply, in which case use the default View.FOCUS_DOWN. 4114 * @param previouslyFocusedRect The rectangle of the view that had focus 4115 * prior in this View's coordinate system. 4116 */ 4117 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4118 if (DBG) { 4119 System.out.println(this + " requestFocus()"); 4120 } 4121 4122 if ((mPrivateFlags & FOCUSED) == 0) { 4123 mPrivateFlags |= FOCUSED; 4124 4125 if (mParent != null) { 4126 mParent.requestChildFocus(this, this); 4127 } 4128 4129 onFocusChanged(true, direction, previouslyFocusedRect); 4130 refreshDrawableState(); 4131 4132 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4133 notifyAccessibilityStateChanged(); 4134 } 4135 } 4136 } 4137 4138 /** 4139 * Request that a rectangle of this view be visible on the screen, 4140 * scrolling if necessary just enough. 4141 * 4142 * <p>A View should call this if it maintains some notion of which part 4143 * of its content is interesting. For example, a text editing view 4144 * should call this when its cursor moves. 4145 * 4146 * @param rectangle The rectangle. 4147 * @return Whether any parent scrolled. 4148 */ 4149 public boolean requestRectangleOnScreen(Rect rectangle) { 4150 return requestRectangleOnScreen(rectangle, false); 4151 } 4152 4153 /** 4154 * Request that a rectangle of this view be visible on the screen, 4155 * scrolling if necessary just enough. 4156 * 4157 * <p>A View should call this if it maintains some notion of which part 4158 * of its content is interesting. For example, a text editing view 4159 * should call this when its cursor moves. 4160 * 4161 * <p>When <code>immediate</code> is set to true, scrolling will not be 4162 * animated. 4163 * 4164 * @param rectangle The rectangle. 4165 * @param immediate True to forbid animated scrolling, false otherwise 4166 * @return Whether any parent scrolled. 4167 */ 4168 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4169 View child = this; 4170 ViewParent parent = mParent; 4171 boolean scrolled = false; 4172 while (parent != null) { 4173 scrolled |= parent.requestChildRectangleOnScreen(child, 4174 rectangle, immediate); 4175 4176 // offset rect so next call has the rectangle in the 4177 // coordinate system of its direct child. 4178 rectangle.offset(child.getLeft(), child.getTop()); 4179 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4180 4181 if (!(parent instanceof View)) { 4182 break; 4183 } 4184 4185 child = (View) parent; 4186 parent = child.getParent(); 4187 } 4188 return scrolled; 4189 } 4190 4191 /** 4192 * Called when this view wants to give up focus. If focus is cleared 4193 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4194 * <p> 4195 * <strong>Note:</strong> When a View clears focus the framework is trying 4196 * to give focus to the first focusable View from the top. Hence, if this 4197 * View is the first from the top that can take focus, then all callbacks 4198 * related to clearing focus will be invoked after wich the framework will 4199 * give focus to this view. 4200 * </p> 4201 */ 4202 public void clearFocus() { 4203 if (DBG) { 4204 System.out.println(this + " clearFocus()"); 4205 } 4206 4207 if ((mPrivateFlags & FOCUSED) != 0) { 4208 mPrivateFlags &= ~FOCUSED; 4209 4210 if (mParent != null) { 4211 mParent.clearChildFocus(this); 4212 } 4213 4214 onFocusChanged(false, 0, null); 4215 4216 refreshDrawableState(); 4217 4218 ensureInputFocusOnFirstFocusable(); 4219 4220 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4221 notifyAccessibilityStateChanged(); 4222 } 4223 } 4224 } 4225 4226 void ensureInputFocusOnFirstFocusable() { 4227 View root = getRootView(); 4228 if (root != null) { 4229 root.requestFocus(); 4230 } 4231 } 4232 4233 /** 4234 * Called internally by the view system when a new view is getting focus. 4235 * This is what clears the old focus. 4236 */ 4237 void unFocus() { 4238 if (DBG) { 4239 System.out.println(this + " unFocus()"); 4240 } 4241 4242 if ((mPrivateFlags & FOCUSED) != 0) { 4243 mPrivateFlags &= ~FOCUSED; 4244 4245 onFocusChanged(false, 0, null); 4246 refreshDrawableState(); 4247 4248 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4249 notifyAccessibilityStateChanged(); 4250 } 4251 } 4252 } 4253 4254 /** 4255 * Returns true if this view has focus iteself, or is the ancestor of the 4256 * view that has focus. 4257 * 4258 * @return True if this view has or contains focus, false otherwise. 4259 */ 4260 @ViewDebug.ExportedProperty(category = "focus") 4261 public boolean hasFocus() { 4262 return (mPrivateFlags & FOCUSED) != 0; 4263 } 4264 4265 /** 4266 * Returns true if this view is focusable or if it contains a reachable View 4267 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4268 * is a View whose parents do not block descendants focus. 4269 * 4270 * Only {@link #VISIBLE} views are considered focusable. 4271 * 4272 * @return True if the view is focusable or if the view contains a focusable 4273 * View, false otherwise. 4274 * 4275 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4276 */ 4277 public boolean hasFocusable() { 4278 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4279 } 4280 4281 /** 4282 * Called by the view system when the focus state of this view changes. 4283 * When the focus change event is caused by directional navigation, direction 4284 * and previouslyFocusedRect provide insight into where the focus is coming from. 4285 * When overriding, be sure to call up through to the super class so that 4286 * the standard focus handling will occur. 4287 * 4288 * @param gainFocus True if the View has focus; false otherwise. 4289 * @param direction The direction focus has moved when requestFocus() 4290 * is called to give this view focus. Values are 4291 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4292 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4293 * It may not always apply, in which case use the default. 4294 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4295 * system, of the previously focused view. If applicable, this will be 4296 * passed in as finer grained information about where the focus is coming 4297 * from (in addition to direction). Will be <code>null</code> otherwise. 4298 */ 4299 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4300 if (gainFocus) { 4301 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4302 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4303 } 4304 } 4305 4306 InputMethodManager imm = InputMethodManager.peekInstance(); 4307 if (!gainFocus) { 4308 if (isPressed()) { 4309 setPressed(false); 4310 } 4311 if (imm != null && mAttachInfo != null 4312 && mAttachInfo.mHasWindowFocus) { 4313 imm.focusOut(this); 4314 } 4315 onFocusLost(); 4316 } else if (imm != null && mAttachInfo != null 4317 && mAttachInfo.mHasWindowFocus) { 4318 imm.focusIn(this); 4319 } 4320 4321 invalidate(true); 4322 ListenerInfo li = mListenerInfo; 4323 if (li != null && li.mOnFocusChangeListener != null) { 4324 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4325 } 4326 4327 if (mAttachInfo != null) { 4328 mAttachInfo.mKeyDispatchState.reset(this); 4329 } 4330 } 4331 4332 /** 4333 * Sends an accessibility event of the given type. If accessiiblity is 4334 * not enabled this method has no effect. The default implementation calls 4335 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4336 * to populate information about the event source (this View), then calls 4337 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4338 * populate the text content of the event source including its descendants, 4339 * and last calls 4340 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4341 * on its parent to resuest sending of the event to interested parties. 4342 * <p> 4343 * If an {@link AccessibilityDelegate} has been specified via calling 4344 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4345 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4346 * responsible for handling this call. 4347 * </p> 4348 * 4349 * @param eventType The type of the event to send, as defined by several types from 4350 * {@link android.view.accessibility.AccessibilityEvent}, such as 4351 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4352 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4353 * 4354 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4355 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4356 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4357 * @see AccessibilityDelegate 4358 */ 4359 public void sendAccessibilityEvent(int eventType) { 4360 if (mAccessibilityDelegate != null) { 4361 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4362 } else { 4363 sendAccessibilityEventInternal(eventType); 4364 } 4365 } 4366 4367 /** 4368 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4369 * {@link AccessibilityEvent} to make an announcement which is related to some 4370 * sort of a context change for which none of the events representing UI transitions 4371 * is a good fit. For example, announcing a new page in a book. If accessibility 4372 * is not enabled this method does nothing. 4373 * 4374 * @param text The announcement text. 4375 */ 4376 public void announceForAccessibility(CharSequence text) { 4377 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4378 AccessibilityEvent event = AccessibilityEvent.obtain( 4379 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4380 onInitializeAccessibilityEvent(event); 4381 event.getText().add(text); 4382 event.setContentDescription(null); 4383 mParent.requestSendAccessibilityEvent(this, event); 4384 } 4385 } 4386 4387 /** 4388 * @see #sendAccessibilityEvent(int) 4389 * 4390 * Note: Called from the default {@link AccessibilityDelegate}. 4391 */ 4392 void sendAccessibilityEventInternal(int eventType) { 4393 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4394 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4395 } 4396 } 4397 4398 /** 4399 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4400 * takes as an argument an empty {@link AccessibilityEvent} and does not 4401 * perform a check whether accessibility is enabled. 4402 * <p> 4403 * If an {@link AccessibilityDelegate} has been specified via calling 4404 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4405 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4406 * is responsible for handling this call. 4407 * </p> 4408 * 4409 * @param event The event to send. 4410 * 4411 * @see #sendAccessibilityEvent(int) 4412 */ 4413 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4414 if (mAccessibilityDelegate != null) { 4415 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4416 } else { 4417 sendAccessibilityEventUncheckedInternal(event); 4418 } 4419 } 4420 4421 /** 4422 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4423 * 4424 * Note: Called from the default {@link AccessibilityDelegate}. 4425 */ 4426 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4427 if (!isShown()) { 4428 return; 4429 } 4430 onInitializeAccessibilityEvent(event); 4431 // Only a subset of accessibility events populates text content. 4432 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4433 dispatchPopulateAccessibilityEvent(event); 4434 } 4435 // In the beginning we called #isShown(), so we know that getParent() is not null. 4436 getParent().requestSendAccessibilityEvent(this, event); 4437 } 4438 4439 /** 4440 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4441 * to its children for adding their text content to the event. Note that the 4442 * event text is populated in a separate dispatch path since we add to the 4443 * event not only the text of the source but also the text of all its descendants. 4444 * A typical implementation will call 4445 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4446 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4447 * on each child. Override this method if custom population of the event text 4448 * content is required. 4449 * <p> 4450 * If an {@link AccessibilityDelegate} has been specified via calling 4451 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4452 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4453 * is responsible for handling this call. 4454 * </p> 4455 * <p> 4456 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4457 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4458 * </p> 4459 * 4460 * @param event The event. 4461 * 4462 * @return True if the event population was completed. 4463 */ 4464 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4465 if (mAccessibilityDelegate != null) { 4466 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4467 } else { 4468 return dispatchPopulateAccessibilityEventInternal(event); 4469 } 4470 } 4471 4472 /** 4473 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4474 * 4475 * Note: Called from the default {@link AccessibilityDelegate}. 4476 */ 4477 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4478 onPopulateAccessibilityEvent(event); 4479 return false; 4480 } 4481 4482 /** 4483 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4484 * giving a chance to this View to populate the accessibility event with its 4485 * text content. While this method is free to modify event 4486 * attributes other than text content, doing so should normally be performed in 4487 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4488 * <p> 4489 * Example: Adding formatted date string to an accessibility event in addition 4490 * to the text added by the super implementation: 4491 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4492 * super.onPopulateAccessibilityEvent(event); 4493 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4494 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4495 * mCurrentDate.getTimeInMillis(), flags); 4496 * event.getText().add(selectedDateUtterance); 4497 * }</pre> 4498 * <p> 4499 * If an {@link AccessibilityDelegate} has been specified via calling 4500 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4501 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4502 * is responsible for handling this call. 4503 * </p> 4504 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4505 * information to the event, in case the default implementation has basic information to add. 4506 * </p> 4507 * 4508 * @param event The accessibility event which to populate. 4509 * 4510 * @see #sendAccessibilityEvent(int) 4511 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4512 */ 4513 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4514 if (mAccessibilityDelegate != null) { 4515 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4516 } else { 4517 onPopulateAccessibilityEventInternal(event); 4518 } 4519 } 4520 4521 /** 4522 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4523 * 4524 * Note: Called from the default {@link AccessibilityDelegate}. 4525 */ 4526 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4527 4528 } 4529 4530 /** 4531 * Initializes an {@link AccessibilityEvent} with information about 4532 * this View which is the event source. In other words, the source of 4533 * an accessibility event is the view whose state change triggered firing 4534 * the event. 4535 * <p> 4536 * Example: Setting the password property of an event in addition 4537 * to properties set by the super implementation: 4538 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4539 * super.onInitializeAccessibilityEvent(event); 4540 * event.setPassword(true); 4541 * }</pre> 4542 * <p> 4543 * If an {@link AccessibilityDelegate} has been specified via calling 4544 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4545 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4546 * is responsible for handling this call. 4547 * </p> 4548 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4549 * information to the event, in case the default implementation has basic information to add. 4550 * </p> 4551 * @param event The event to initialize. 4552 * 4553 * @see #sendAccessibilityEvent(int) 4554 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4555 */ 4556 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4557 if (mAccessibilityDelegate != null) { 4558 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4559 } else { 4560 onInitializeAccessibilityEventInternal(event); 4561 } 4562 } 4563 4564 /** 4565 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4566 * 4567 * Note: Called from the default {@link AccessibilityDelegate}. 4568 */ 4569 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4570 event.setSource(this); 4571 event.setClassName(View.class.getName()); 4572 event.setPackageName(getContext().getPackageName()); 4573 event.setEnabled(isEnabled()); 4574 event.setContentDescription(mContentDescription); 4575 4576 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4577 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4578 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4579 FOCUSABLES_ALL); 4580 event.setItemCount(focusablesTempList.size()); 4581 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4582 focusablesTempList.clear(); 4583 } 4584 } 4585 4586 /** 4587 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4588 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4589 * This method is responsible for obtaining an accessibility node info from a 4590 * pool of reusable instances and calling 4591 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4592 * initialize the former. 4593 * <p> 4594 * Note: The client is responsible for recycling the obtained instance by calling 4595 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4596 * </p> 4597 * 4598 * @return A populated {@link AccessibilityNodeInfo}. 4599 * 4600 * @see AccessibilityNodeInfo 4601 */ 4602 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4603 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4604 if (provider != null) { 4605 return provider.createAccessibilityNodeInfo(View.NO_ID); 4606 } else { 4607 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4608 onInitializeAccessibilityNodeInfo(info); 4609 return info; 4610 } 4611 } 4612 4613 /** 4614 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4615 * The base implementation sets: 4616 * <ul> 4617 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4618 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4619 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4620 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4621 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4622 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4623 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4624 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4625 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4626 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4627 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4628 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4629 * </ul> 4630 * <p> 4631 * Subclasses should override this method, call the super implementation, 4632 * and set additional attributes. 4633 * </p> 4634 * <p> 4635 * If an {@link AccessibilityDelegate} has been specified via calling 4636 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4637 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4638 * is responsible for handling this call. 4639 * </p> 4640 * 4641 * @param info The instance to initialize. 4642 */ 4643 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4644 if (mAccessibilityDelegate != null) { 4645 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4646 } else { 4647 onInitializeAccessibilityNodeInfoInternal(info); 4648 } 4649 } 4650 4651 /** 4652 * Gets the location of this view in screen coordintates. 4653 * 4654 * @param outRect The output location 4655 */ 4656 private void getBoundsOnScreen(Rect outRect) { 4657 if (mAttachInfo == null) { 4658 return; 4659 } 4660 4661 RectF position = mAttachInfo.mTmpTransformRect; 4662 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4663 4664 if (!hasIdentityMatrix()) { 4665 getMatrix().mapRect(position); 4666 } 4667 4668 position.offset(mLeft, mTop); 4669 4670 ViewParent parent = mParent; 4671 while (parent instanceof View) { 4672 View parentView = (View) parent; 4673 4674 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4675 4676 if (!parentView.hasIdentityMatrix()) { 4677 parentView.getMatrix().mapRect(position); 4678 } 4679 4680 position.offset(parentView.mLeft, parentView.mTop); 4681 4682 parent = parentView.mParent; 4683 } 4684 4685 if (parent instanceof ViewRootImpl) { 4686 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4687 position.offset(0, -viewRootImpl.mCurScrollY); 4688 } 4689 4690 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4691 4692 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4693 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4694 } 4695 4696 /** 4697 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4698 * 4699 * Note: Called from the default {@link AccessibilityDelegate}. 4700 */ 4701 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4702 Rect bounds = mAttachInfo.mTmpInvalRect; 4703 4704 getDrawingRect(bounds); 4705 info.setBoundsInParent(bounds); 4706 4707 getBoundsOnScreen(bounds); 4708 info.setBoundsInScreen(bounds); 4709 4710 ViewParent parent = getParentForAccessibility(); 4711 if (parent instanceof View) { 4712 info.setParent((View) parent); 4713 } 4714 4715 info.setVisibleToUser(isVisibleToUser()); 4716 4717 info.setPackageName(mContext.getPackageName()); 4718 info.setClassName(View.class.getName()); 4719 info.setContentDescription(getContentDescription()); 4720 4721 info.setEnabled(isEnabled()); 4722 info.setClickable(isClickable()); 4723 info.setFocusable(isFocusable()); 4724 info.setFocused(isFocused()); 4725 info.setAccessibilityFocused(isAccessibilityFocused()); 4726 info.setSelected(isSelected()); 4727 info.setLongClickable(isLongClickable()); 4728 4729 // TODO: These make sense only if we are in an AdapterView but all 4730 // views can be selected. Maybe from accessiiblity perspective 4731 // we should report as selectable view in an AdapterView. 4732 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4733 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4734 4735 if (isFocusable()) { 4736 if (isFocused()) { 4737 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4738 } else { 4739 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4740 } 4741 } 4742 4743 if (!isAccessibilityFocused()) { 4744 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4745 } else { 4746 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4747 } 4748 4749 if (isClickable() && isEnabled()) { 4750 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4751 } 4752 4753 if (isLongClickable() && isEnabled()) { 4754 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4755 } 4756 4757 if (mContentDescription != null && mContentDescription.length() > 0) { 4758 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4759 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4760 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4761 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4762 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4763 } 4764 } 4765 4766 /** 4767 * Computes whether this view is visible to the user. Such a view is 4768 * attached, visible, all its predecessors are visible, it is not clipped 4769 * entirely by its predecessors, and has an alpha greater than zero. 4770 * 4771 * @return Whether the view is visible on the screen. 4772 * 4773 * @hide 4774 */ 4775 protected boolean isVisibleToUser() { 4776 return isVisibleToUser(null); 4777 } 4778 4779 /** 4780 * Computes whether the given portion of this view is visible to the user. 4781 * Such a view is attached, visible, all its predecessors are visible, 4782 * has an alpha greater than zero, and the specified portion is not 4783 * clipped entirely by its predecessors. 4784 * 4785 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4786 * <code>null</code>, and the entire view will be tested in this case. 4787 * When <code>true</code> is returned by the function, the actual visible 4788 * region will be stored in this parameter; that is, if boundInView is fully 4789 * contained within the view, no modification will be made, otherwise regions 4790 * outside of the visible area of the view will be clipped. 4791 * 4792 * @return Whether the specified portion of the view is visible on the screen. 4793 * 4794 * @hide 4795 */ 4796 protected boolean isVisibleToUser(Rect boundInView) { 4797 if (mAttachInfo != null) { 4798 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4799 Point offset = mAttachInfo.mPoint; 4800 // The first two checks are made also made by isShown() which 4801 // however traverses the tree up to the parent to catch that. 4802 // Therefore, we do some fail fast check to minimize the up 4803 // tree traversal. 4804 boolean isVisible = mAttachInfo.mWindowVisibility == View.VISIBLE 4805 && getAlpha() > 0 4806 && isShown() 4807 && getGlobalVisibleRect(visibleRect, offset); 4808 if (isVisible && boundInView != null) { 4809 visibleRect.offset(-offset.x, -offset.y); 4810 // isVisible is always true here, use a simple assignment 4811 isVisible = boundInView.intersect(visibleRect); 4812 } 4813 return isVisible; 4814 } 4815 4816 return false; 4817 } 4818 4819 /** 4820 * Sets a delegate for implementing accessibility support via compositon as 4821 * opposed to inheritance. The delegate's primary use is for implementing 4822 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4823 * 4824 * @param delegate The delegate instance. 4825 * 4826 * @see AccessibilityDelegate 4827 */ 4828 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4829 mAccessibilityDelegate = delegate; 4830 } 4831 4832 /** 4833 * Gets the provider for managing a virtual view hierarchy rooted at this View 4834 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4835 * that explore the window content. 4836 * <p> 4837 * If this method returns an instance, this instance is responsible for managing 4838 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4839 * View including the one representing the View itself. Similarly the returned 4840 * instance is responsible for performing accessibility actions on any virtual 4841 * view or the root view itself. 4842 * </p> 4843 * <p> 4844 * If an {@link AccessibilityDelegate} has been specified via calling 4845 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4846 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4847 * is responsible for handling this call. 4848 * </p> 4849 * 4850 * @return The provider. 4851 * 4852 * @see AccessibilityNodeProvider 4853 */ 4854 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4855 if (mAccessibilityDelegate != null) { 4856 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4857 } else { 4858 return null; 4859 } 4860 } 4861 4862 /** 4863 * Gets the unique identifier of this view on the screen for accessibility purposes. 4864 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4865 * 4866 * @return The view accessibility id. 4867 * 4868 * @hide 4869 */ 4870 public int getAccessibilityViewId() { 4871 if (mAccessibilityViewId == NO_ID) { 4872 mAccessibilityViewId = sNextAccessibilityViewId++; 4873 } 4874 return mAccessibilityViewId; 4875 } 4876 4877 /** 4878 * Gets the unique identifier of the window in which this View reseides. 4879 * 4880 * @return The window accessibility id. 4881 * 4882 * @hide 4883 */ 4884 public int getAccessibilityWindowId() { 4885 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4886 } 4887 4888 /** 4889 * Gets the {@link View} description. It briefly describes the view and is 4890 * primarily used for accessibility support. Set this property to enable 4891 * better accessibility support for your application. This is especially 4892 * true for views that do not have textual representation (For example, 4893 * ImageButton). 4894 * 4895 * @return The content description. 4896 * 4897 * @attr ref android.R.styleable#View_contentDescription 4898 */ 4899 @ViewDebug.ExportedProperty(category = "accessibility") 4900 public CharSequence getContentDescription() { 4901 return mContentDescription; 4902 } 4903 4904 /** 4905 * Sets the {@link View} description. It briefly describes the view and is 4906 * primarily used for accessibility support. Set this property to enable 4907 * better accessibility support for your application. This is especially 4908 * true for views that do not have textual representation (For example, 4909 * ImageButton). 4910 * 4911 * @param contentDescription The content description. 4912 * 4913 * @attr ref android.R.styleable#View_contentDescription 4914 */ 4915 @RemotableViewMethod 4916 public void setContentDescription(CharSequence contentDescription) { 4917 mContentDescription = contentDescription; 4918 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 4919 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 4920 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 4921 } 4922 } 4923 4924 /** 4925 * Invoked whenever this view loses focus, either by losing window focus or by losing 4926 * focus within its window. This method can be used to clear any state tied to the 4927 * focus. For instance, if a button is held pressed with the trackball and the window 4928 * loses focus, this method can be used to cancel the press. 4929 * 4930 * Subclasses of View overriding this method should always call super.onFocusLost(). 4931 * 4932 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4933 * @see #onWindowFocusChanged(boolean) 4934 * 4935 * @hide pending API council approval 4936 */ 4937 protected void onFocusLost() { 4938 resetPressedState(); 4939 } 4940 4941 private void resetPressedState() { 4942 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4943 return; 4944 } 4945 4946 if (isPressed()) { 4947 setPressed(false); 4948 4949 if (!mHasPerformedLongPress) { 4950 removeLongPressCallback(); 4951 } 4952 } 4953 } 4954 4955 /** 4956 * Returns true if this view has focus 4957 * 4958 * @return True if this view has focus, false otherwise. 4959 */ 4960 @ViewDebug.ExportedProperty(category = "focus") 4961 public boolean isFocused() { 4962 return (mPrivateFlags & FOCUSED) != 0; 4963 } 4964 4965 /** 4966 * Find the view in the hierarchy rooted at this view that currently has 4967 * focus. 4968 * 4969 * @return The view that currently has focus, or null if no focused view can 4970 * be found. 4971 */ 4972 public View findFocus() { 4973 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4974 } 4975 4976 /** 4977 * Indicates whether this view is one of the set of scrollable containers in 4978 * its window. 4979 * 4980 * @return whether this view is one of the set of scrollable containers in 4981 * its window 4982 * 4983 * @attr ref android.R.styleable#View_isScrollContainer 4984 */ 4985 public boolean isScrollContainer() { 4986 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 4987 } 4988 4989 /** 4990 * Change whether this view is one of the set of scrollable containers in 4991 * its window. This will be used to determine whether the window can 4992 * resize or must pan when a soft input area is open -- scrollable 4993 * containers allow the window to use resize mode since the container 4994 * will appropriately shrink. 4995 * 4996 * @attr ref android.R.styleable#View_isScrollContainer 4997 */ 4998 public void setScrollContainer(boolean isScrollContainer) { 4999 if (isScrollContainer) { 5000 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5001 mAttachInfo.mScrollContainers.add(this); 5002 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5003 } 5004 mPrivateFlags |= SCROLL_CONTAINER; 5005 } else { 5006 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5007 mAttachInfo.mScrollContainers.remove(this); 5008 } 5009 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5010 } 5011 } 5012 5013 /** 5014 * Returns the quality of the drawing cache. 5015 * 5016 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5017 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5018 * 5019 * @see #setDrawingCacheQuality(int) 5020 * @see #setDrawingCacheEnabled(boolean) 5021 * @see #isDrawingCacheEnabled() 5022 * 5023 * @attr ref android.R.styleable#View_drawingCacheQuality 5024 */ 5025 public int getDrawingCacheQuality() { 5026 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5027 } 5028 5029 /** 5030 * Set the drawing cache quality of this view. This value is used only when the 5031 * drawing cache is enabled 5032 * 5033 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5034 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5035 * 5036 * @see #getDrawingCacheQuality() 5037 * @see #setDrawingCacheEnabled(boolean) 5038 * @see #isDrawingCacheEnabled() 5039 * 5040 * @attr ref android.R.styleable#View_drawingCacheQuality 5041 */ 5042 public void setDrawingCacheQuality(int quality) { 5043 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5044 } 5045 5046 /** 5047 * Returns whether the screen should remain on, corresponding to the current 5048 * value of {@link #KEEP_SCREEN_ON}. 5049 * 5050 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5051 * 5052 * @see #setKeepScreenOn(boolean) 5053 * 5054 * @attr ref android.R.styleable#View_keepScreenOn 5055 */ 5056 public boolean getKeepScreenOn() { 5057 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5058 } 5059 5060 /** 5061 * Controls whether the screen should remain on, modifying the 5062 * value of {@link #KEEP_SCREEN_ON}. 5063 * 5064 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5065 * 5066 * @see #getKeepScreenOn() 5067 * 5068 * @attr ref android.R.styleable#View_keepScreenOn 5069 */ 5070 public void setKeepScreenOn(boolean keepScreenOn) { 5071 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5072 } 5073 5074 /** 5075 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5076 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5077 * 5078 * @attr ref android.R.styleable#View_nextFocusLeft 5079 */ 5080 public int getNextFocusLeftId() { 5081 return mNextFocusLeftId; 5082 } 5083 5084 /** 5085 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5086 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5087 * decide automatically. 5088 * 5089 * @attr ref android.R.styleable#View_nextFocusLeft 5090 */ 5091 public void setNextFocusLeftId(int nextFocusLeftId) { 5092 mNextFocusLeftId = nextFocusLeftId; 5093 } 5094 5095 /** 5096 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5097 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5098 * 5099 * @attr ref android.R.styleable#View_nextFocusRight 5100 */ 5101 public int getNextFocusRightId() { 5102 return mNextFocusRightId; 5103 } 5104 5105 /** 5106 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5107 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5108 * decide automatically. 5109 * 5110 * @attr ref android.R.styleable#View_nextFocusRight 5111 */ 5112 public void setNextFocusRightId(int nextFocusRightId) { 5113 mNextFocusRightId = nextFocusRightId; 5114 } 5115 5116 /** 5117 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5118 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5119 * 5120 * @attr ref android.R.styleable#View_nextFocusUp 5121 */ 5122 public int getNextFocusUpId() { 5123 return mNextFocusUpId; 5124 } 5125 5126 /** 5127 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5128 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5129 * decide automatically. 5130 * 5131 * @attr ref android.R.styleable#View_nextFocusUp 5132 */ 5133 public void setNextFocusUpId(int nextFocusUpId) { 5134 mNextFocusUpId = nextFocusUpId; 5135 } 5136 5137 /** 5138 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5139 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5140 * 5141 * @attr ref android.R.styleable#View_nextFocusDown 5142 */ 5143 public int getNextFocusDownId() { 5144 return mNextFocusDownId; 5145 } 5146 5147 /** 5148 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5149 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5150 * decide automatically. 5151 * 5152 * @attr ref android.R.styleable#View_nextFocusDown 5153 */ 5154 public void setNextFocusDownId(int nextFocusDownId) { 5155 mNextFocusDownId = nextFocusDownId; 5156 } 5157 5158 /** 5159 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5160 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5161 * 5162 * @attr ref android.R.styleable#View_nextFocusForward 5163 */ 5164 public int getNextFocusForwardId() { 5165 return mNextFocusForwardId; 5166 } 5167 5168 /** 5169 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5170 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5171 * decide automatically. 5172 * 5173 * @attr ref android.R.styleable#View_nextFocusForward 5174 */ 5175 public void setNextFocusForwardId(int nextFocusForwardId) { 5176 mNextFocusForwardId = nextFocusForwardId; 5177 } 5178 5179 /** 5180 * Returns the visibility of this view and all of its ancestors 5181 * 5182 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5183 */ 5184 public boolean isShown() { 5185 View current = this; 5186 //noinspection ConstantConditions 5187 do { 5188 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5189 return false; 5190 } 5191 ViewParent parent = current.mParent; 5192 if (parent == null) { 5193 return false; // We are not attached to the view root 5194 } 5195 if (!(parent instanceof View)) { 5196 return true; 5197 } 5198 current = (View) parent; 5199 } while (current != null); 5200 5201 return false; 5202 } 5203 5204 /** 5205 * Called by the view hierarchy when the content insets for a window have 5206 * changed, to allow it to adjust its content to fit within those windows. 5207 * The content insets tell you the space that the status bar, input method, 5208 * and other system windows infringe on the application's window. 5209 * 5210 * <p>You do not normally need to deal with this function, since the default 5211 * window decoration given to applications takes care of applying it to the 5212 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5213 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5214 * and your content can be placed under those system elements. You can then 5215 * use this method within your view hierarchy if you have parts of your UI 5216 * which you would like to ensure are not being covered. 5217 * 5218 * <p>The default implementation of this method simply applies the content 5219 * inset's to the view's padding, consuming that content (modifying the 5220 * insets to be 0), and returning true. This behavior is off by default, but can 5221 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5222 * 5223 * <p>This function's traversal down the hierarchy is depth-first. The same content 5224 * insets object is propagated down the hierarchy, so any changes made to it will 5225 * be seen by all following views (including potentially ones above in 5226 * the hierarchy since this is a depth-first traversal). The first view 5227 * that returns true will abort the entire traversal. 5228 * 5229 * <p>The default implementation works well for a situation where it is 5230 * used with a container that covers the entire window, allowing it to 5231 * apply the appropriate insets to its content on all edges. If you need 5232 * a more complicated layout (such as two different views fitting system 5233 * windows, one on the top of the window, and one on the bottom), 5234 * you can override the method and handle the insets however you would like. 5235 * Note that the insets provided by the framework are always relative to the 5236 * far edges of the window, not accounting for the location of the called view 5237 * within that window. (In fact when this method is called you do not yet know 5238 * where the layout will place the view, as it is done before layout happens.) 5239 * 5240 * <p>Note: unlike many View methods, there is no dispatch phase to this 5241 * call. If you are overriding it in a ViewGroup and want to allow the 5242 * call to continue to your children, you must be sure to call the super 5243 * implementation. 5244 * 5245 * <p>Here is a sample layout that makes use of fitting system windows 5246 * to have controls for a video view placed inside of the window decorations 5247 * that it hides and shows. This can be used with code like the second 5248 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5249 * 5250 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5251 * 5252 * @param insets Current content insets of the window. Prior to 5253 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5254 * the insets or else you and Android will be unhappy. 5255 * 5256 * @return Return true if this view applied the insets and it should not 5257 * continue propagating further down the hierarchy, false otherwise. 5258 * @see #getFitsSystemWindows() 5259 * @see #setFitsSystemWindows(boolean) 5260 * @see #setSystemUiVisibility(int) 5261 */ 5262 protected boolean fitSystemWindows(Rect insets) { 5263 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5264 mUserPaddingStart = -1; 5265 mUserPaddingEnd = -1; 5266 mUserPaddingRelative = false; 5267 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5268 || mAttachInfo == null 5269 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5270 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5271 return true; 5272 } else { 5273 internalSetPadding(0, 0, 0, 0); 5274 return false; 5275 } 5276 } 5277 return false; 5278 } 5279 5280 /** 5281 * Sets whether or not this view should account for system screen decorations 5282 * such as the status bar and inset its content; that is, controlling whether 5283 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5284 * executed. See that method for more details. 5285 * 5286 * <p>Note that if you are providing your own implementation of 5287 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5288 * flag to true -- your implementation will be overriding the default 5289 * implementation that checks this flag. 5290 * 5291 * @param fitSystemWindows If true, then the default implementation of 5292 * {@link #fitSystemWindows(Rect)} will be executed. 5293 * 5294 * @attr ref android.R.styleable#View_fitsSystemWindows 5295 * @see #getFitsSystemWindows() 5296 * @see #fitSystemWindows(Rect) 5297 * @see #setSystemUiVisibility(int) 5298 */ 5299 public void setFitsSystemWindows(boolean fitSystemWindows) { 5300 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5301 } 5302 5303 /** 5304 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5305 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5306 * will be executed. 5307 * 5308 * @return Returns true if the default implementation of 5309 * {@link #fitSystemWindows(Rect)} will be executed. 5310 * 5311 * @attr ref android.R.styleable#View_fitsSystemWindows 5312 * @see #setFitsSystemWindows() 5313 * @see #fitSystemWindows(Rect) 5314 * @see #setSystemUiVisibility(int) 5315 */ 5316 public boolean getFitsSystemWindows() { 5317 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5318 } 5319 5320 /** @hide */ 5321 public boolean fitsSystemWindows() { 5322 return getFitsSystemWindows(); 5323 } 5324 5325 /** 5326 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5327 */ 5328 public void requestFitSystemWindows() { 5329 if (mParent != null) { 5330 mParent.requestFitSystemWindows(); 5331 } 5332 } 5333 5334 /** 5335 * For use by PhoneWindow to make its own system window fitting optional. 5336 * @hide 5337 */ 5338 public void makeOptionalFitsSystemWindows() { 5339 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5340 } 5341 5342 /** 5343 * Returns the visibility status for this view. 5344 * 5345 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5346 * @attr ref android.R.styleable#View_visibility 5347 */ 5348 @ViewDebug.ExportedProperty(mapping = { 5349 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5350 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5351 @ViewDebug.IntToString(from = GONE, to = "GONE") 5352 }) 5353 public int getVisibility() { 5354 return mViewFlags & VISIBILITY_MASK; 5355 } 5356 5357 /** 5358 * Set the enabled state of this view. 5359 * 5360 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5361 * @attr ref android.R.styleable#View_visibility 5362 */ 5363 @RemotableViewMethod 5364 public void setVisibility(int visibility) { 5365 setFlags(visibility, VISIBILITY_MASK); 5366 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5367 } 5368 5369 /** 5370 * Returns the enabled status for this view. The interpretation of the 5371 * enabled state varies by subclass. 5372 * 5373 * @return True if this view is enabled, false otherwise. 5374 */ 5375 @ViewDebug.ExportedProperty 5376 public boolean isEnabled() { 5377 return (mViewFlags & ENABLED_MASK) == ENABLED; 5378 } 5379 5380 /** 5381 * Set the enabled state of this view. The interpretation of the enabled 5382 * state varies by subclass. 5383 * 5384 * @param enabled True if this view is enabled, false otherwise. 5385 */ 5386 @RemotableViewMethod 5387 public void setEnabled(boolean enabled) { 5388 if (enabled == isEnabled()) return; 5389 5390 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5391 5392 /* 5393 * The View most likely has to change its appearance, so refresh 5394 * the drawable state. 5395 */ 5396 refreshDrawableState(); 5397 5398 // Invalidate too, since the default behavior for views is to be 5399 // be drawn at 50% alpha rather than to change the drawable. 5400 invalidate(true); 5401 } 5402 5403 /** 5404 * Set whether this view can receive the focus. 5405 * 5406 * Setting this to false will also ensure that this view is not focusable 5407 * in touch mode. 5408 * 5409 * @param focusable If true, this view can receive the focus. 5410 * 5411 * @see #setFocusableInTouchMode(boolean) 5412 * @attr ref android.R.styleable#View_focusable 5413 */ 5414 public void setFocusable(boolean focusable) { 5415 if (!focusable) { 5416 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5417 } 5418 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5419 } 5420 5421 /** 5422 * Set whether this view can receive focus while in touch mode. 5423 * 5424 * Setting this to true will also ensure that this view is focusable. 5425 * 5426 * @param focusableInTouchMode If true, this view can receive the focus while 5427 * in touch mode. 5428 * 5429 * @see #setFocusable(boolean) 5430 * @attr ref android.R.styleable#View_focusableInTouchMode 5431 */ 5432 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5433 // Focusable in touch mode should always be set before the focusable flag 5434 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5435 // which, in touch mode, will not successfully request focus on this view 5436 // because the focusable in touch mode flag is not set 5437 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5438 if (focusableInTouchMode) { 5439 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5440 } 5441 } 5442 5443 /** 5444 * Set whether this view should have sound effects enabled for events such as 5445 * clicking and touching. 5446 * 5447 * <p>You may wish to disable sound effects for a view if you already play sounds, 5448 * for instance, a dial key that plays dtmf tones. 5449 * 5450 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5451 * @see #isSoundEffectsEnabled() 5452 * @see #playSoundEffect(int) 5453 * @attr ref android.R.styleable#View_soundEffectsEnabled 5454 */ 5455 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5456 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5457 } 5458 5459 /** 5460 * @return whether this view should have sound effects enabled for events such as 5461 * clicking and touching. 5462 * 5463 * @see #setSoundEffectsEnabled(boolean) 5464 * @see #playSoundEffect(int) 5465 * @attr ref android.R.styleable#View_soundEffectsEnabled 5466 */ 5467 @ViewDebug.ExportedProperty 5468 public boolean isSoundEffectsEnabled() { 5469 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5470 } 5471 5472 /** 5473 * Set whether this view should have haptic feedback for events such as 5474 * long presses. 5475 * 5476 * <p>You may wish to disable haptic feedback if your view already controls 5477 * its own haptic feedback. 5478 * 5479 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5480 * @see #isHapticFeedbackEnabled() 5481 * @see #performHapticFeedback(int) 5482 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5483 */ 5484 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5485 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5486 } 5487 5488 /** 5489 * @return whether this view should have haptic feedback enabled for events 5490 * long presses. 5491 * 5492 * @see #setHapticFeedbackEnabled(boolean) 5493 * @see #performHapticFeedback(int) 5494 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5495 */ 5496 @ViewDebug.ExportedProperty 5497 public boolean isHapticFeedbackEnabled() { 5498 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5499 } 5500 5501 /** 5502 * Returns the layout direction for this view. 5503 * 5504 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5505 * {@link #LAYOUT_DIRECTION_RTL}, 5506 * {@link #LAYOUT_DIRECTION_INHERIT} or 5507 * {@link #LAYOUT_DIRECTION_LOCALE}. 5508 * @attr ref android.R.styleable#View_layoutDirection 5509 */ 5510 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5511 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5512 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5513 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5514 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5515 }) 5516 public int getLayoutDirection() { 5517 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5518 } 5519 5520 /** 5521 * Set the layout direction for this view. This will propagate a reset of layout direction 5522 * resolution to the view's children and resolve layout direction for this view. 5523 * 5524 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5525 * {@link #LAYOUT_DIRECTION_RTL}, 5526 * {@link #LAYOUT_DIRECTION_INHERIT} or 5527 * {@link #LAYOUT_DIRECTION_LOCALE}. 5528 * 5529 * @attr ref android.R.styleable#View_layoutDirection 5530 */ 5531 @RemotableViewMethod 5532 public void setLayoutDirection(int layoutDirection) { 5533 if (getLayoutDirection() != layoutDirection) { 5534 // Reset the current layout direction and the resolved one 5535 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5536 resetResolvedLayoutDirection(); 5537 // Set the new layout direction (filtered) and ask for a layout pass 5538 mPrivateFlags2 |= 5539 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5540 requestLayout(); 5541 } 5542 } 5543 5544 /** 5545 * Returns the resolved layout direction for this view. 5546 * 5547 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5548 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5549 */ 5550 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5551 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5552 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5553 }) 5554 public int getResolvedLayoutDirection() { 5555 // The layout direction will be resolved only if needed 5556 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5557 resolveLayoutDirection(); 5558 } 5559 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5560 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5561 } 5562 5563 /** 5564 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5565 * layout attribute and/or the inherited value from the parent 5566 * 5567 * @return true if the layout is right-to-left. 5568 */ 5569 @ViewDebug.ExportedProperty(category = "layout") 5570 public boolean isLayoutRtl() { 5571 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5572 } 5573 5574 /** 5575 * Indicates whether the view is currently tracking transient state that the 5576 * app should not need to concern itself with saving and restoring, but that 5577 * the framework should take special note to preserve when possible. 5578 * 5579 * <p>A view with transient state cannot be trivially rebound from an external 5580 * data source, such as an adapter binding item views in a list. This may be 5581 * because the view is performing an animation, tracking user selection 5582 * of content, or similar.</p> 5583 * 5584 * @return true if the view has transient state 5585 */ 5586 @ViewDebug.ExportedProperty(category = "layout") 5587 public boolean hasTransientState() { 5588 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5589 } 5590 5591 /** 5592 * Set whether this view is currently tracking transient state that the 5593 * framework should attempt to preserve when possible. This flag is reference counted, 5594 * so every call to setHasTransientState(true) should be paired with a later call 5595 * to setHasTransientState(false). 5596 * 5597 * <p>A view with transient state cannot be trivially rebound from an external 5598 * data source, such as an adapter binding item views in a list. This may be 5599 * because the view is performing an animation, tracking user selection 5600 * of content, or similar.</p> 5601 * 5602 * @param hasTransientState true if this view has transient state 5603 */ 5604 public void setHasTransientState(boolean hasTransientState) { 5605 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5606 mTransientStateCount - 1; 5607 if (mTransientStateCount < 0) { 5608 mTransientStateCount = 0; 5609 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5610 "unmatched pair of setHasTransientState calls"); 5611 } 5612 if ((hasTransientState && mTransientStateCount == 1) || 5613 (!hasTransientState && mTransientStateCount == 0)) { 5614 // update flag if we've just incremented up from 0 or decremented down to 0 5615 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5616 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5617 if (mParent != null) { 5618 try { 5619 mParent.childHasTransientStateChanged(this, hasTransientState); 5620 } catch (AbstractMethodError e) { 5621 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5622 " does not fully implement ViewParent", e); 5623 } 5624 } 5625 } 5626 } 5627 5628 /** 5629 * If this view doesn't do any drawing on its own, set this flag to 5630 * allow further optimizations. By default, this flag is not set on 5631 * View, but could be set on some View subclasses such as ViewGroup. 5632 * 5633 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5634 * you should clear this flag. 5635 * 5636 * @param willNotDraw whether or not this View draw on its own 5637 */ 5638 public void setWillNotDraw(boolean willNotDraw) { 5639 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5640 } 5641 5642 /** 5643 * Returns whether or not this View draws on its own. 5644 * 5645 * @return true if this view has nothing to draw, false otherwise 5646 */ 5647 @ViewDebug.ExportedProperty(category = "drawing") 5648 public boolean willNotDraw() { 5649 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5650 } 5651 5652 /** 5653 * When a View's drawing cache is enabled, drawing is redirected to an 5654 * offscreen bitmap. Some views, like an ImageView, must be able to 5655 * bypass this mechanism if they already draw a single bitmap, to avoid 5656 * unnecessary usage of the memory. 5657 * 5658 * @param willNotCacheDrawing true if this view does not cache its 5659 * drawing, false otherwise 5660 */ 5661 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5662 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5663 } 5664 5665 /** 5666 * Returns whether or not this View can cache its drawing or not. 5667 * 5668 * @return true if this view does not cache its drawing, false otherwise 5669 */ 5670 @ViewDebug.ExportedProperty(category = "drawing") 5671 public boolean willNotCacheDrawing() { 5672 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5673 } 5674 5675 /** 5676 * Indicates whether this view reacts to click events or not. 5677 * 5678 * @return true if the view is clickable, false otherwise 5679 * 5680 * @see #setClickable(boolean) 5681 * @attr ref android.R.styleable#View_clickable 5682 */ 5683 @ViewDebug.ExportedProperty 5684 public boolean isClickable() { 5685 return (mViewFlags & CLICKABLE) == CLICKABLE; 5686 } 5687 5688 /** 5689 * Enables or disables click events for this view. When a view 5690 * is clickable it will change its state to "pressed" on every click. 5691 * Subclasses should set the view clickable to visually react to 5692 * user's clicks. 5693 * 5694 * @param clickable true to make the view clickable, false otherwise 5695 * 5696 * @see #isClickable() 5697 * @attr ref android.R.styleable#View_clickable 5698 */ 5699 public void setClickable(boolean clickable) { 5700 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5701 } 5702 5703 /** 5704 * Indicates whether this view reacts to long click events or not. 5705 * 5706 * @return true if the view is long clickable, false otherwise 5707 * 5708 * @see #setLongClickable(boolean) 5709 * @attr ref android.R.styleable#View_longClickable 5710 */ 5711 public boolean isLongClickable() { 5712 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5713 } 5714 5715 /** 5716 * Enables or disables long click events for this view. When a view is long 5717 * clickable it reacts to the user holding down the button for a longer 5718 * duration than a tap. This event can either launch the listener or a 5719 * context menu. 5720 * 5721 * @param longClickable true to make the view long clickable, false otherwise 5722 * @see #isLongClickable() 5723 * @attr ref android.R.styleable#View_longClickable 5724 */ 5725 public void setLongClickable(boolean longClickable) { 5726 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5727 } 5728 5729 /** 5730 * Sets the pressed state for this view. 5731 * 5732 * @see #isClickable() 5733 * @see #setClickable(boolean) 5734 * 5735 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5736 * the View's internal state from a previously set "pressed" state. 5737 */ 5738 public void setPressed(boolean pressed) { 5739 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5740 5741 if (pressed) { 5742 mPrivateFlags |= PRESSED; 5743 } else { 5744 mPrivateFlags &= ~PRESSED; 5745 } 5746 5747 if (needsRefresh) { 5748 refreshDrawableState(); 5749 } 5750 dispatchSetPressed(pressed); 5751 } 5752 5753 /** 5754 * Dispatch setPressed to all of this View's children. 5755 * 5756 * @see #setPressed(boolean) 5757 * 5758 * @param pressed The new pressed state 5759 */ 5760 protected void dispatchSetPressed(boolean pressed) { 5761 } 5762 5763 /** 5764 * Indicates whether the view is currently in pressed state. Unless 5765 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5766 * the pressed state. 5767 * 5768 * @see #setPressed(boolean) 5769 * @see #isClickable() 5770 * @see #setClickable(boolean) 5771 * 5772 * @return true if the view is currently pressed, false otherwise 5773 */ 5774 public boolean isPressed() { 5775 return (mPrivateFlags & PRESSED) == PRESSED; 5776 } 5777 5778 /** 5779 * Indicates whether this view will save its state (that is, 5780 * whether its {@link #onSaveInstanceState} method will be called). 5781 * 5782 * @return Returns true if the view state saving is enabled, else false. 5783 * 5784 * @see #setSaveEnabled(boolean) 5785 * @attr ref android.R.styleable#View_saveEnabled 5786 */ 5787 public boolean isSaveEnabled() { 5788 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5789 } 5790 5791 /** 5792 * Controls whether the saving of this view's state is 5793 * enabled (that is, whether its {@link #onSaveInstanceState} method 5794 * will be called). Note that even if freezing is enabled, the 5795 * view still must have an id assigned to it (via {@link #setId(int)}) 5796 * for its state to be saved. This flag can only disable the 5797 * saving of this view; any child views may still have their state saved. 5798 * 5799 * @param enabled Set to false to <em>disable</em> state saving, or true 5800 * (the default) to allow it. 5801 * 5802 * @see #isSaveEnabled() 5803 * @see #setId(int) 5804 * @see #onSaveInstanceState() 5805 * @attr ref android.R.styleable#View_saveEnabled 5806 */ 5807 public void setSaveEnabled(boolean enabled) { 5808 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5809 } 5810 5811 /** 5812 * Gets whether the framework should discard touches when the view's 5813 * window is obscured by another visible window. 5814 * Refer to the {@link View} security documentation for more details. 5815 * 5816 * @return True if touch filtering is enabled. 5817 * 5818 * @see #setFilterTouchesWhenObscured(boolean) 5819 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5820 */ 5821 @ViewDebug.ExportedProperty 5822 public boolean getFilterTouchesWhenObscured() { 5823 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5824 } 5825 5826 /** 5827 * Sets whether the framework should discard touches when the view's 5828 * window is obscured by another visible window. 5829 * Refer to the {@link View} security documentation for more details. 5830 * 5831 * @param enabled True if touch filtering should be enabled. 5832 * 5833 * @see #getFilterTouchesWhenObscured 5834 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5835 */ 5836 public void setFilterTouchesWhenObscured(boolean enabled) { 5837 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5838 FILTER_TOUCHES_WHEN_OBSCURED); 5839 } 5840 5841 /** 5842 * Indicates whether the entire hierarchy under this view will save its 5843 * state when a state saving traversal occurs from its parent. The default 5844 * is true; if false, these views will not be saved unless 5845 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5846 * 5847 * @return Returns true if the view state saving from parent is enabled, else false. 5848 * 5849 * @see #setSaveFromParentEnabled(boolean) 5850 */ 5851 public boolean isSaveFromParentEnabled() { 5852 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5853 } 5854 5855 /** 5856 * Controls whether the entire hierarchy under this view will save its 5857 * state when a state saving traversal occurs from its parent. The default 5858 * is true; if false, these views will not be saved unless 5859 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5860 * 5861 * @param enabled Set to false to <em>disable</em> state saving, or true 5862 * (the default) to allow it. 5863 * 5864 * @see #isSaveFromParentEnabled() 5865 * @see #setId(int) 5866 * @see #onSaveInstanceState() 5867 */ 5868 public void setSaveFromParentEnabled(boolean enabled) { 5869 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5870 } 5871 5872 5873 /** 5874 * Returns whether this View is able to take focus. 5875 * 5876 * @return True if this view can take focus, or false otherwise. 5877 * @attr ref android.R.styleable#View_focusable 5878 */ 5879 @ViewDebug.ExportedProperty(category = "focus") 5880 public final boolean isFocusable() { 5881 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5882 } 5883 5884 /** 5885 * When a view is focusable, it may not want to take focus when in touch mode. 5886 * For example, a button would like focus when the user is navigating via a D-pad 5887 * so that the user can click on it, but once the user starts touching the screen, 5888 * the button shouldn't take focus 5889 * @return Whether the view is focusable in touch mode. 5890 * @attr ref android.R.styleable#View_focusableInTouchMode 5891 */ 5892 @ViewDebug.ExportedProperty 5893 public final boolean isFocusableInTouchMode() { 5894 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5895 } 5896 5897 /** 5898 * Find the nearest view in the specified direction that can take focus. 5899 * This does not actually give focus to that view. 5900 * 5901 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5902 * 5903 * @return The nearest focusable in the specified direction, or null if none 5904 * can be found. 5905 */ 5906 public View focusSearch(int direction) { 5907 if (mParent != null) { 5908 return mParent.focusSearch(this, direction); 5909 } else { 5910 return null; 5911 } 5912 } 5913 5914 /** 5915 * This method is the last chance for the focused view and its ancestors to 5916 * respond to an arrow key. This is called when the focused view did not 5917 * consume the key internally, nor could the view system find a new view in 5918 * the requested direction to give focus to. 5919 * 5920 * @param focused The currently focused view. 5921 * @param direction The direction focus wants to move. One of FOCUS_UP, 5922 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5923 * @return True if the this view consumed this unhandled move. 5924 */ 5925 public boolean dispatchUnhandledMove(View focused, int direction) { 5926 return false; 5927 } 5928 5929 /** 5930 * If a user manually specified the next view id for a particular direction, 5931 * use the root to look up the view. 5932 * @param root The root view of the hierarchy containing this view. 5933 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5934 * or FOCUS_BACKWARD. 5935 * @return The user specified next view, or null if there is none. 5936 */ 5937 View findUserSetNextFocus(View root, int direction) { 5938 switch (direction) { 5939 case FOCUS_LEFT: 5940 if (mNextFocusLeftId == View.NO_ID) return null; 5941 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5942 case FOCUS_RIGHT: 5943 if (mNextFocusRightId == View.NO_ID) return null; 5944 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5945 case FOCUS_UP: 5946 if (mNextFocusUpId == View.NO_ID) return null; 5947 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5948 case FOCUS_DOWN: 5949 if (mNextFocusDownId == View.NO_ID) return null; 5950 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5951 case FOCUS_FORWARD: 5952 if (mNextFocusForwardId == View.NO_ID) return null; 5953 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5954 case FOCUS_BACKWARD: { 5955 if (mID == View.NO_ID) return null; 5956 final int id = mID; 5957 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5958 @Override 5959 public boolean apply(View t) { 5960 return t.mNextFocusForwardId == id; 5961 } 5962 }); 5963 } 5964 } 5965 return null; 5966 } 5967 5968 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5969 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5970 @Override 5971 public boolean apply(View t) { 5972 return t.mID == childViewId; 5973 } 5974 }); 5975 5976 if (result == null) { 5977 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5978 + "by user for id " + childViewId); 5979 } 5980 return result; 5981 } 5982 5983 /** 5984 * Find and return all focusable views that are descendants of this view, 5985 * possibly including this view if it is focusable itself. 5986 * 5987 * @param direction The direction of the focus 5988 * @return A list of focusable views 5989 */ 5990 public ArrayList<View> getFocusables(int direction) { 5991 ArrayList<View> result = new ArrayList<View>(24); 5992 addFocusables(result, direction); 5993 return result; 5994 } 5995 5996 /** 5997 * Add any focusable views that are descendants of this view (possibly 5998 * including this view if it is focusable itself) to views. If we are in touch mode, 5999 * only add views that are also focusable in touch mode. 6000 * 6001 * @param views Focusable views found so far 6002 * @param direction The direction of the focus 6003 */ 6004 public void addFocusables(ArrayList<View> views, int direction) { 6005 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6006 } 6007 6008 /** 6009 * Adds any focusable views that are descendants of this view (possibly 6010 * including this view if it is focusable itself) to views. This method 6011 * adds all focusable views regardless if we are in touch mode or 6012 * only views focusable in touch mode if we are in touch mode or 6013 * only views that can take accessibility focus if accessibility is enabeld 6014 * depending on the focusable mode paramater. 6015 * 6016 * @param views Focusable views found so far or null if all we are interested is 6017 * the number of focusables. 6018 * @param direction The direction of the focus. 6019 * @param focusableMode The type of focusables to be added. 6020 * 6021 * @see #FOCUSABLES_ALL 6022 * @see #FOCUSABLES_TOUCH_MODE 6023 */ 6024 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6025 if (views == null) { 6026 return; 6027 } 6028 if (!isFocusable()) { 6029 return; 6030 } 6031 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6032 && isInTouchMode() && !isFocusableInTouchMode()) { 6033 return; 6034 } 6035 views.add(this); 6036 } 6037 6038 /** 6039 * Finds the Views that contain given text. The containment is case insensitive. 6040 * The search is performed by either the text that the View renders or the content 6041 * description that describes the view for accessibility purposes and the view does 6042 * not render or both. Clients can specify how the search is to be performed via 6043 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6044 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6045 * 6046 * @param outViews The output list of matching Views. 6047 * @param searched The text to match against. 6048 * 6049 * @see #FIND_VIEWS_WITH_TEXT 6050 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6051 * @see #setContentDescription(CharSequence) 6052 */ 6053 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6054 if (getAccessibilityNodeProvider() != null) { 6055 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6056 outViews.add(this); 6057 } 6058 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6059 && (searched != null && searched.length() > 0) 6060 && (mContentDescription != null && mContentDescription.length() > 0)) { 6061 String searchedLowerCase = searched.toString().toLowerCase(); 6062 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6063 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6064 outViews.add(this); 6065 } 6066 } 6067 } 6068 6069 /** 6070 * Find and return all touchable views that are descendants of this view, 6071 * possibly including this view if it is touchable itself. 6072 * 6073 * @return A list of touchable views 6074 */ 6075 public ArrayList<View> getTouchables() { 6076 ArrayList<View> result = new ArrayList<View>(); 6077 addTouchables(result); 6078 return result; 6079 } 6080 6081 /** 6082 * Add any touchable views that are descendants of this view (possibly 6083 * including this view if it is touchable itself) to views. 6084 * 6085 * @param views Touchable views found so far 6086 */ 6087 public void addTouchables(ArrayList<View> views) { 6088 final int viewFlags = mViewFlags; 6089 6090 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6091 && (viewFlags & ENABLED_MASK) == ENABLED) { 6092 views.add(this); 6093 } 6094 } 6095 6096 /** 6097 * Returns whether this View is accessibility focused. 6098 * 6099 * @return True if this View is accessibility focused. 6100 */ 6101 boolean isAccessibilityFocused() { 6102 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6103 } 6104 6105 /** 6106 * Call this to try to give accessibility focus to this view. 6107 * 6108 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6109 * returns false or the view is no visible or the view already has accessibility 6110 * focus. 6111 * 6112 * See also {@link #focusSearch(int)}, which is what you call to say that you 6113 * have focus, and you want your parent to look for the next one. 6114 * 6115 * @return Whether this view actually took accessibility focus. 6116 * 6117 * @hide 6118 */ 6119 public boolean requestAccessibilityFocus() { 6120 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6121 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6122 return false; 6123 } 6124 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6125 return false; 6126 } 6127 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6128 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6129 ViewRootImpl viewRootImpl = getViewRootImpl(); 6130 if (viewRootImpl != null) { 6131 viewRootImpl.setAccessibilityFocus(this, null); 6132 } 6133 invalidate(); 6134 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6135 notifyAccessibilityStateChanged(); 6136 return true; 6137 } 6138 return false; 6139 } 6140 6141 /** 6142 * Call this to try to clear accessibility focus of this view. 6143 * 6144 * See also {@link #focusSearch(int)}, which is what you call to say that you 6145 * have focus, and you want your parent to look for the next one. 6146 * 6147 * @hide 6148 */ 6149 public void clearAccessibilityFocus() { 6150 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6151 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6152 invalidate(); 6153 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6154 notifyAccessibilityStateChanged(); 6155 } 6156 // Clear the global reference of accessibility focus if this 6157 // view or any of its descendants had accessibility focus. 6158 ViewRootImpl viewRootImpl = getViewRootImpl(); 6159 if (viewRootImpl != null) { 6160 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6161 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6162 viewRootImpl.setAccessibilityFocus(null, null); 6163 } 6164 } 6165 } 6166 6167 private void sendAccessibilityHoverEvent(int eventType) { 6168 // Since we are not delivering to a client accessibility events from not 6169 // important views (unless the clinet request that) we need to fire the 6170 // event from the deepest view exposed to the client. As a consequence if 6171 // the user crosses a not exposed view the client will see enter and exit 6172 // of the exposed predecessor followed by and enter and exit of that same 6173 // predecessor when entering and exiting the not exposed descendant. This 6174 // is fine since the client has a clear idea which view is hovered at the 6175 // price of a couple more events being sent. This is a simple and 6176 // working solution. 6177 View source = this; 6178 while (true) { 6179 if (source.includeForAccessibility()) { 6180 source.sendAccessibilityEvent(eventType); 6181 return; 6182 } 6183 ViewParent parent = source.getParent(); 6184 if (parent instanceof View) { 6185 source = (View) parent; 6186 } else { 6187 return; 6188 } 6189 } 6190 } 6191 6192 /** 6193 * Clears accessibility focus without calling any callback methods 6194 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6195 * is used for clearing accessibility focus when giving this focus to 6196 * another view. 6197 */ 6198 void clearAccessibilityFocusNoCallbacks() { 6199 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6200 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6201 invalidate(); 6202 } 6203 } 6204 6205 /** 6206 * Call this to try to give focus to a specific view or to one of its 6207 * descendants. 6208 * 6209 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6210 * false), or if it is focusable and it is not focusable in touch mode 6211 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6212 * 6213 * See also {@link #focusSearch(int)}, which is what you call to say that you 6214 * have focus, and you want your parent to look for the next one. 6215 * 6216 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6217 * {@link #FOCUS_DOWN} and <code>null</code>. 6218 * 6219 * @return Whether this view or one of its descendants actually took focus. 6220 */ 6221 public final boolean requestFocus() { 6222 return requestFocus(View.FOCUS_DOWN); 6223 } 6224 6225 /** 6226 * Call this to try to give focus to a specific view or to one of its 6227 * descendants and give it a hint about what direction focus is heading. 6228 * 6229 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6230 * false), or if it is focusable and it is not focusable in touch mode 6231 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6232 * 6233 * See also {@link #focusSearch(int)}, which is what you call to say that you 6234 * have focus, and you want your parent to look for the next one. 6235 * 6236 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6237 * <code>null</code> set for the previously focused rectangle. 6238 * 6239 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6240 * @return Whether this view or one of its descendants actually took focus. 6241 */ 6242 public final boolean requestFocus(int direction) { 6243 return requestFocus(direction, null); 6244 } 6245 6246 /** 6247 * Call this to try to give focus to a specific view or to one of its descendants 6248 * and give it hints about the direction and a specific rectangle that the focus 6249 * is coming from. The rectangle can help give larger views a finer grained hint 6250 * about where focus is coming from, and therefore, where to show selection, or 6251 * forward focus change internally. 6252 * 6253 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6254 * false), or if it is focusable and it is not focusable in touch mode 6255 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6256 * 6257 * A View will not take focus if it is not visible. 6258 * 6259 * A View will not take focus if one of its parents has 6260 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6261 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6262 * 6263 * See also {@link #focusSearch(int)}, which is what you call to say that you 6264 * have focus, and you want your parent to look for the next one. 6265 * 6266 * You may wish to override this method if your custom {@link View} has an internal 6267 * {@link View} that it wishes to forward the request to. 6268 * 6269 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6270 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6271 * to give a finer grained hint about where focus is coming from. May be null 6272 * if there is no hint. 6273 * @return Whether this view or one of its descendants actually took focus. 6274 */ 6275 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6276 return requestFocusNoSearch(direction, previouslyFocusedRect); 6277 } 6278 6279 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6280 // need to be focusable 6281 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6282 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6283 return false; 6284 } 6285 6286 // need to be focusable in touch mode if in touch mode 6287 if (isInTouchMode() && 6288 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6289 return false; 6290 } 6291 6292 // need to not have any parents blocking us 6293 if (hasAncestorThatBlocksDescendantFocus()) { 6294 return false; 6295 } 6296 6297 handleFocusGainInternal(direction, previouslyFocusedRect); 6298 return true; 6299 } 6300 6301 /** 6302 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6303 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6304 * touch mode to request focus when they are touched. 6305 * 6306 * @return Whether this view or one of its descendants actually took focus. 6307 * 6308 * @see #isInTouchMode() 6309 * 6310 */ 6311 public final boolean requestFocusFromTouch() { 6312 // Leave touch mode if we need to 6313 if (isInTouchMode()) { 6314 ViewRootImpl viewRoot = getViewRootImpl(); 6315 if (viewRoot != null) { 6316 viewRoot.ensureTouchMode(false); 6317 } 6318 } 6319 return requestFocus(View.FOCUS_DOWN); 6320 } 6321 6322 /** 6323 * @return Whether any ancestor of this view blocks descendant focus. 6324 */ 6325 private boolean hasAncestorThatBlocksDescendantFocus() { 6326 ViewParent ancestor = mParent; 6327 while (ancestor instanceof ViewGroup) { 6328 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6329 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6330 return true; 6331 } else { 6332 ancestor = vgAncestor.getParent(); 6333 } 6334 } 6335 return false; 6336 } 6337 6338 /** 6339 * Gets the mode for determining whether this View is important for accessibility 6340 * which is if it fires accessibility events and if it is reported to 6341 * accessibility services that query the screen. 6342 * 6343 * @return The mode for determining whether a View is important for accessibility. 6344 * 6345 * @attr ref android.R.styleable#View_importantForAccessibility 6346 * 6347 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6348 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6349 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6350 */ 6351 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6352 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6353 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6354 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6355 }) 6356 public int getImportantForAccessibility() { 6357 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6358 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6359 } 6360 6361 /** 6362 * Sets how to determine whether this view is important for accessibility 6363 * which is if it fires accessibility events and if it is reported to 6364 * accessibility services that query the screen. 6365 * 6366 * @param mode How to determine whether this view is important for accessibility. 6367 * 6368 * @attr ref android.R.styleable#View_importantForAccessibility 6369 * 6370 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6371 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6372 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6373 */ 6374 public void setImportantForAccessibility(int mode) { 6375 if (mode != getImportantForAccessibility()) { 6376 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6377 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6378 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6379 notifyAccessibilityStateChanged(); 6380 } 6381 } 6382 6383 /** 6384 * Gets whether this view should be exposed for accessibility. 6385 * 6386 * @return Whether the view is exposed for accessibility. 6387 * 6388 * @hide 6389 */ 6390 public boolean isImportantForAccessibility() { 6391 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6392 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6393 switch (mode) { 6394 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6395 return true; 6396 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6397 return false; 6398 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6399 return isActionableForAccessibility() || hasListenersForAccessibility(); 6400 default: 6401 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6402 + mode); 6403 } 6404 } 6405 6406 /** 6407 * Gets the parent for accessibility purposes. Note that the parent for 6408 * accessibility is not necessary the immediate parent. It is the first 6409 * predecessor that is important for accessibility. 6410 * 6411 * @return The parent for accessibility purposes. 6412 */ 6413 public ViewParent getParentForAccessibility() { 6414 if (mParent instanceof View) { 6415 View parentView = (View) mParent; 6416 if (parentView.includeForAccessibility()) { 6417 return mParent; 6418 } else { 6419 return mParent.getParentForAccessibility(); 6420 } 6421 } 6422 return null; 6423 } 6424 6425 /** 6426 * Adds the children of a given View for accessibility. Since some Views are 6427 * not important for accessibility the children for accessibility are not 6428 * necessarily direct children of the riew, rather they are the first level of 6429 * descendants important for accessibility. 6430 * 6431 * @param children The list of children for accessibility. 6432 */ 6433 public void addChildrenForAccessibility(ArrayList<View> children) { 6434 if (includeForAccessibility()) { 6435 children.add(this); 6436 } 6437 } 6438 6439 /** 6440 * Whether to regard this view for accessibility. A view is regarded for 6441 * accessibility if it is important for accessibility or the querying 6442 * accessibility service has explicitly requested that view not 6443 * important for accessibility are regarded. 6444 * 6445 * @return Whether to regard the view for accessibility. 6446 * 6447 * @hide 6448 */ 6449 public boolean includeForAccessibility() { 6450 if (mAttachInfo != null) { 6451 return mAttachInfo.mIncludeNotImportantViews || isImportantForAccessibility(); 6452 } 6453 return false; 6454 } 6455 6456 /** 6457 * Returns whether the View is considered actionable from 6458 * accessibility perspective. Such view are important for 6459 * accessiiblity. 6460 * 6461 * @return True if the view is actionable for accessibility. 6462 * 6463 * @hide 6464 */ 6465 public boolean isActionableForAccessibility() { 6466 return (isClickable() || isLongClickable() || isFocusable()); 6467 } 6468 6469 /** 6470 * Returns whether the View has registered callbacks wich makes it 6471 * important for accessiiblity. 6472 * 6473 * @return True if the view is actionable for accessibility. 6474 */ 6475 private boolean hasListenersForAccessibility() { 6476 ListenerInfo info = getListenerInfo(); 6477 return mTouchDelegate != null || info.mOnKeyListener != null 6478 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6479 || info.mOnHoverListener != null || info.mOnDragListener != null; 6480 } 6481 6482 /** 6483 * Notifies accessibility services that some view's important for 6484 * accessibility state has changed. Note that such notifications 6485 * are made at most once every 6486 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6487 * to avoid unnecessary load to the system. Also once a view has 6488 * made a notifucation this method is a NOP until the notification has 6489 * been sent to clients. 6490 * 6491 * @hide 6492 * 6493 * TODO: Makse sure this method is called for any view state change 6494 * that is interesting for accessilility purposes. 6495 */ 6496 public void notifyAccessibilityStateChanged() { 6497 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6498 return; 6499 } 6500 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6501 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6502 if (mParent != null) { 6503 mParent.childAccessibilityStateChanged(this); 6504 } 6505 } 6506 } 6507 6508 /** 6509 * Reset the state indicating the this view has requested clients 6510 * interested in its accessiblity state to be notified. 6511 * 6512 * @hide 6513 */ 6514 public void resetAccessibilityStateChanged() { 6515 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6516 } 6517 6518 /** 6519 * Performs the specified accessibility action on the view. For 6520 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6521 * <p> 6522 * If an {@link AccessibilityDelegate} has been specified via calling 6523 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6524 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6525 * is responsible for handling this call. 6526 * </p> 6527 * 6528 * @param action The action to perform. 6529 * @param arguments Optional action arguments. 6530 * @return Whether the action was performed. 6531 */ 6532 public boolean performAccessibilityAction(int action, Bundle arguments) { 6533 if (mAccessibilityDelegate != null) { 6534 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6535 } else { 6536 return performAccessibilityActionInternal(action, arguments); 6537 } 6538 } 6539 6540 /** 6541 * @see #performAccessibilityAction(int, Bundle) 6542 * 6543 * Note: Called from the default {@link AccessibilityDelegate}. 6544 */ 6545 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6546 switch (action) { 6547 case AccessibilityNodeInfo.ACTION_CLICK: { 6548 if (isClickable()) { 6549 return performClick(); 6550 } 6551 } break; 6552 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6553 if (isLongClickable()) { 6554 return performLongClick(); 6555 } 6556 } break; 6557 case AccessibilityNodeInfo.ACTION_FOCUS: { 6558 if (!hasFocus()) { 6559 // Get out of touch mode since accessibility 6560 // wants to move focus around. 6561 getViewRootImpl().ensureTouchMode(false); 6562 return requestFocus(); 6563 } 6564 } break; 6565 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6566 if (hasFocus()) { 6567 clearFocus(); 6568 return !isFocused(); 6569 } 6570 } break; 6571 case AccessibilityNodeInfo.ACTION_SELECT: { 6572 if (!isSelected()) { 6573 setSelected(true); 6574 return isSelected(); 6575 } 6576 } break; 6577 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6578 if (isSelected()) { 6579 setSelected(false); 6580 return !isSelected(); 6581 } 6582 } break; 6583 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6584 if (!isAccessibilityFocused()) { 6585 return requestAccessibilityFocus(); 6586 } 6587 } break; 6588 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6589 if (isAccessibilityFocused()) { 6590 clearAccessibilityFocus(); 6591 return true; 6592 } 6593 } break; 6594 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6595 if (arguments != null) { 6596 final int granularity = arguments.getInt( 6597 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6598 return nextAtGranularity(granularity); 6599 } 6600 } break; 6601 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6602 if (arguments != null) { 6603 final int granularity = arguments.getInt( 6604 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6605 return previousAtGranularity(granularity); 6606 } 6607 } break; 6608 } 6609 return false; 6610 } 6611 6612 private boolean nextAtGranularity(int granularity) { 6613 CharSequence text = getIterableTextForAccessibility(); 6614 if (text == null || text.length() == 0) { 6615 return false; 6616 } 6617 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6618 if (iterator == null) { 6619 return false; 6620 } 6621 final int current = getAccessibilityCursorPosition(); 6622 final int[] range = iterator.following(current); 6623 if (range == null) { 6624 return false; 6625 } 6626 final int start = range[0]; 6627 final int end = range[1]; 6628 setAccessibilityCursorPosition(end); 6629 sendViewTextTraversedAtGranularityEvent( 6630 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6631 granularity, start, end); 6632 return true; 6633 } 6634 6635 private boolean previousAtGranularity(int granularity) { 6636 CharSequence text = getIterableTextForAccessibility(); 6637 if (text == null || text.length() == 0) { 6638 return false; 6639 } 6640 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6641 if (iterator == null) { 6642 return false; 6643 } 6644 int current = getAccessibilityCursorPosition(); 6645 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 6646 current = text.length(); 6647 } else if (granularity == AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER) { 6648 // When traversing by character we always put the cursor after the character 6649 // to ease edit and have to compensate before asking the for previous segment. 6650 current--; 6651 } 6652 final int[] range = iterator.preceding(current); 6653 if (range == null) { 6654 return false; 6655 } 6656 final int start = range[0]; 6657 final int end = range[1]; 6658 // Always put the cursor after the character to ease edit. 6659 if (granularity == AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER) { 6660 setAccessibilityCursorPosition(end); 6661 } else { 6662 setAccessibilityCursorPosition(start); 6663 } 6664 sendViewTextTraversedAtGranularityEvent( 6665 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6666 granularity, start, end); 6667 return true; 6668 } 6669 6670 /** 6671 * Gets the text reported for accessibility purposes. 6672 * 6673 * @return The accessibility text. 6674 * 6675 * @hide 6676 */ 6677 public CharSequence getIterableTextForAccessibility() { 6678 return mContentDescription; 6679 } 6680 6681 /** 6682 * @hide 6683 */ 6684 public int getAccessibilityCursorPosition() { 6685 return mAccessibilityCursorPosition; 6686 } 6687 6688 /** 6689 * @hide 6690 */ 6691 public void setAccessibilityCursorPosition(int position) { 6692 mAccessibilityCursorPosition = position; 6693 } 6694 6695 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6696 int fromIndex, int toIndex) { 6697 if (mParent == null) { 6698 return; 6699 } 6700 AccessibilityEvent event = AccessibilityEvent.obtain( 6701 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6702 onInitializeAccessibilityEvent(event); 6703 onPopulateAccessibilityEvent(event); 6704 event.setFromIndex(fromIndex); 6705 event.setToIndex(toIndex); 6706 event.setAction(action); 6707 event.setMovementGranularity(granularity); 6708 mParent.requestSendAccessibilityEvent(this, event); 6709 } 6710 6711 /** 6712 * @hide 6713 */ 6714 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6715 switch (granularity) { 6716 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6717 CharSequence text = getIterableTextForAccessibility(); 6718 if (text != null && text.length() > 0) { 6719 CharacterTextSegmentIterator iterator = 6720 CharacterTextSegmentIterator.getInstance( 6721 mContext.getResources().getConfiguration().locale); 6722 iterator.initialize(text.toString()); 6723 return iterator; 6724 } 6725 } break; 6726 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6727 CharSequence text = getIterableTextForAccessibility(); 6728 if (text != null && text.length() > 0) { 6729 WordTextSegmentIterator iterator = 6730 WordTextSegmentIterator.getInstance( 6731 mContext.getResources().getConfiguration().locale); 6732 iterator.initialize(text.toString()); 6733 return iterator; 6734 } 6735 } break; 6736 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6737 CharSequence text = getIterableTextForAccessibility(); 6738 if (text != null && text.length() > 0) { 6739 ParagraphTextSegmentIterator iterator = 6740 ParagraphTextSegmentIterator.getInstance(); 6741 iterator.initialize(text.toString()); 6742 return iterator; 6743 } 6744 } break; 6745 } 6746 return null; 6747 } 6748 6749 /** 6750 * @hide 6751 */ 6752 public void dispatchStartTemporaryDetach() { 6753 clearAccessibilityFocus(); 6754 clearDisplayList(); 6755 6756 onStartTemporaryDetach(); 6757 } 6758 6759 /** 6760 * This is called when a container is going to temporarily detach a child, with 6761 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6762 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6763 * {@link #onDetachedFromWindow()} when the container is done. 6764 */ 6765 public void onStartTemporaryDetach() { 6766 removeUnsetPressCallback(); 6767 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6768 } 6769 6770 /** 6771 * @hide 6772 */ 6773 public void dispatchFinishTemporaryDetach() { 6774 onFinishTemporaryDetach(); 6775 } 6776 6777 /** 6778 * Called after {@link #onStartTemporaryDetach} when the container is done 6779 * changing the view. 6780 */ 6781 public void onFinishTemporaryDetach() { 6782 } 6783 6784 /** 6785 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6786 * for this view's window. Returns null if the view is not currently attached 6787 * to the window. Normally you will not need to use this directly, but 6788 * just use the standard high-level event callbacks like 6789 * {@link #onKeyDown(int, KeyEvent)}. 6790 */ 6791 public KeyEvent.DispatcherState getKeyDispatcherState() { 6792 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6793 } 6794 6795 /** 6796 * Dispatch a key event before it is processed by any input method 6797 * associated with the view hierarchy. This can be used to intercept 6798 * key events in special situations before the IME consumes them; a 6799 * typical example would be handling the BACK key to update the application's 6800 * UI instead of allowing the IME to see it and close itself. 6801 * 6802 * @param event The key event to be dispatched. 6803 * @return True if the event was handled, false otherwise. 6804 */ 6805 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6806 return onKeyPreIme(event.getKeyCode(), event); 6807 } 6808 6809 /** 6810 * Dispatch a key event to the next view on the focus path. This path runs 6811 * from the top of the view tree down to the currently focused view. If this 6812 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6813 * the next node down the focus path. This method also fires any key 6814 * listeners. 6815 * 6816 * @param event The key event to be dispatched. 6817 * @return True if the event was handled, false otherwise. 6818 */ 6819 public boolean dispatchKeyEvent(KeyEvent event) { 6820 if (mInputEventConsistencyVerifier != null) { 6821 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6822 } 6823 6824 // Give any attached key listener a first crack at the event. 6825 //noinspection SimplifiableIfStatement 6826 ListenerInfo li = mListenerInfo; 6827 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6828 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6829 return true; 6830 } 6831 6832 if (event.dispatch(this, mAttachInfo != null 6833 ? mAttachInfo.mKeyDispatchState : null, this)) { 6834 return true; 6835 } 6836 6837 if (mInputEventConsistencyVerifier != null) { 6838 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6839 } 6840 return false; 6841 } 6842 6843 /** 6844 * Dispatches a key shortcut event. 6845 * 6846 * @param event The key event to be dispatched. 6847 * @return True if the event was handled by the view, false otherwise. 6848 */ 6849 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6850 return onKeyShortcut(event.getKeyCode(), event); 6851 } 6852 6853 /** 6854 * Pass the touch screen motion event down to the target view, or this 6855 * view if it is the target. 6856 * 6857 * @param event The motion event to be dispatched. 6858 * @return True if the event was handled by the view, false otherwise. 6859 */ 6860 public boolean dispatchTouchEvent(MotionEvent event) { 6861 if (mInputEventConsistencyVerifier != null) { 6862 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6863 } 6864 6865 if (onFilterTouchEventForSecurity(event)) { 6866 //noinspection SimplifiableIfStatement 6867 ListenerInfo li = mListenerInfo; 6868 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6869 && li.mOnTouchListener.onTouch(this, event)) { 6870 return true; 6871 } 6872 6873 if (onTouchEvent(event)) { 6874 return true; 6875 } 6876 } 6877 6878 if (mInputEventConsistencyVerifier != null) { 6879 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6880 } 6881 return false; 6882 } 6883 6884 /** 6885 * Filter the touch event to apply security policies. 6886 * 6887 * @param event The motion event to be filtered. 6888 * @return True if the event should be dispatched, false if the event should be dropped. 6889 * 6890 * @see #getFilterTouchesWhenObscured 6891 */ 6892 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6893 //noinspection RedundantIfStatement 6894 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6895 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6896 // Window is obscured, drop this touch. 6897 return false; 6898 } 6899 return true; 6900 } 6901 6902 /** 6903 * Pass a trackball motion event down to the focused view. 6904 * 6905 * @param event The motion event to be dispatched. 6906 * @return True if the event was handled by the view, false otherwise. 6907 */ 6908 public boolean dispatchTrackballEvent(MotionEvent event) { 6909 if (mInputEventConsistencyVerifier != null) { 6910 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6911 } 6912 6913 return onTrackballEvent(event); 6914 } 6915 6916 /** 6917 * Dispatch a generic motion event. 6918 * <p> 6919 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6920 * are delivered to the view under the pointer. All other generic motion events are 6921 * delivered to the focused view. Hover events are handled specially and are delivered 6922 * to {@link #onHoverEvent(MotionEvent)}. 6923 * </p> 6924 * 6925 * @param event The motion event to be dispatched. 6926 * @return True if the event was handled by the view, false otherwise. 6927 */ 6928 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6929 if (mInputEventConsistencyVerifier != null) { 6930 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6931 } 6932 6933 final int source = event.getSource(); 6934 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6935 final int action = event.getAction(); 6936 if (action == MotionEvent.ACTION_HOVER_ENTER 6937 || action == MotionEvent.ACTION_HOVER_MOVE 6938 || action == MotionEvent.ACTION_HOVER_EXIT) { 6939 if (dispatchHoverEvent(event)) { 6940 return true; 6941 } 6942 } else if (dispatchGenericPointerEvent(event)) { 6943 return true; 6944 } 6945 } else if (dispatchGenericFocusedEvent(event)) { 6946 return true; 6947 } 6948 6949 if (dispatchGenericMotionEventInternal(event)) { 6950 return true; 6951 } 6952 6953 if (mInputEventConsistencyVerifier != null) { 6954 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6955 } 6956 return false; 6957 } 6958 6959 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6960 //noinspection SimplifiableIfStatement 6961 ListenerInfo li = mListenerInfo; 6962 if (li != null && li.mOnGenericMotionListener != null 6963 && (mViewFlags & ENABLED_MASK) == ENABLED 6964 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6965 return true; 6966 } 6967 6968 if (onGenericMotionEvent(event)) { 6969 return true; 6970 } 6971 6972 if (mInputEventConsistencyVerifier != null) { 6973 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6974 } 6975 return false; 6976 } 6977 6978 /** 6979 * Dispatch a hover event. 6980 * <p> 6981 * Do not call this method directly. 6982 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6983 * </p> 6984 * 6985 * @param event The motion event to be dispatched. 6986 * @return True if the event was handled by the view, false otherwise. 6987 */ 6988 protected boolean dispatchHoverEvent(MotionEvent event) { 6989 //noinspection SimplifiableIfStatement 6990 ListenerInfo li = mListenerInfo; 6991 if (li != null && li.mOnHoverListener != null 6992 && (mViewFlags & ENABLED_MASK) == ENABLED 6993 && li.mOnHoverListener.onHover(this, event)) { 6994 return true; 6995 } 6996 6997 return onHoverEvent(event); 6998 } 6999 7000 /** 7001 * Returns true if the view has a child to which it has recently sent 7002 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7003 * it does not have a hovered child, then it must be the innermost hovered view. 7004 * @hide 7005 */ 7006 protected boolean hasHoveredChild() { 7007 return false; 7008 } 7009 7010 /** 7011 * Dispatch a generic motion event to the view under the first pointer. 7012 * <p> 7013 * Do not call this method directly. 7014 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7015 * </p> 7016 * 7017 * @param event The motion event to be dispatched. 7018 * @return True if the event was handled by the view, false otherwise. 7019 */ 7020 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7021 return false; 7022 } 7023 7024 /** 7025 * Dispatch a generic motion event to the currently focused view. 7026 * <p> 7027 * Do not call this method directly. 7028 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7029 * </p> 7030 * 7031 * @param event The motion event to be dispatched. 7032 * @return True if the event was handled by the view, false otherwise. 7033 */ 7034 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7035 return false; 7036 } 7037 7038 /** 7039 * Dispatch a pointer event. 7040 * <p> 7041 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7042 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7043 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7044 * and should not be expected to handle other pointing device features. 7045 * </p> 7046 * 7047 * @param event The motion event to be dispatched. 7048 * @return True if the event was handled by the view, false otherwise. 7049 * @hide 7050 */ 7051 public final boolean dispatchPointerEvent(MotionEvent event) { 7052 if (event.isTouchEvent()) { 7053 return dispatchTouchEvent(event); 7054 } else { 7055 return dispatchGenericMotionEvent(event); 7056 } 7057 } 7058 7059 /** 7060 * Called when the window containing this view gains or loses window focus. 7061 * ViewGroups should override to route to their children. 7062 * 7063 * @param hasFocus True if the window containing this view now has focus, 7064 * false otherwise. 7065 */ 7066 public void dispatchWindowFocusChanged(boolean hasFocus) { 7067 onWindowFocusChanged(hasFocus); 7068 } 7069 7070 /** 7071 * Called when the window containing this view gains or loses focus. Note 7072 * that this is separate from view focus: to receive key events, both 7073 * your view and its window must have focus. If a window is displayed 7074 * on top of yours that takes input focus, then your own window will lose 7075 * focus but the view focus will remain unchanged. 7076 * 7077 * @param hasWindowFocus True if the window containing this view now has 7078 * focus, false otherwise. 7079 */ 7080 public void onWindowFocusChanged(boolean hasWindowFocus) { 7081 InputMethodManager imm = InputMethodManager.peekInstance(); 7082 if (!hasWindowFocus) { 7083 if (isPressed()) { 7084 setPressed(false); 7085 } 7086 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7087 imm.focusOut(this); 7088 } 7089 removeLongPressCallback(); 7090 removeTapCallback(); 7091 onFocusLost(); 7092 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7093 imm.focusIn(this); 7094 } 7095 refreshDrawableState(); 7096 } 7097 7098 /** 7099 * Returns true if this view is in a window that currently has window focus. 7100 * Note that this is not the same as the view itself having focus. 7101 * 7102 * @return True if this view is in a window that currently has window focus. 7103 */ 7104 public boolean hasWindowFocus() { 7105 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7106 } 7107 7108 /** 7109 * Dispatch a view visibility change down the view hierarchy. 7110 * ViewGroups should override to route to their children. 7111 * @param changedView The view whose visibility changed. Could be 'this' or 7112 * an ancestor view. 7113 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7114 * {@link #INVISIBLE} or {@link #GONE}. 7115 */ 7116 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7117 onVisibilityChanged(changedView, visibility); 7118 } 7119 7120 /** 7121 * Called when the visibility of the view or an ancestor of the view is changed. 7122 * @param changedView The view whose visibility changed. Could be 'this' or 7123 * an ancestor view. 7124 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7125 * {@link #INVISIBLE} or {@link #GONE}. 7126 */ 7127 protected void onVisibilityChanged(View changedView, int visibility) { 7128 if (visibility == VISIBLE) { 7129 if (mAttachInfo != null) { 7130 initialAwakenScrollBars(); 7131 } else { 7132 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7133 } 7134 } 7135 } 7136 7137 /** 7138 * Dispatch a hint about whether this view is displayed. For instance, when 7139 * a View moves out of the screen, it might receives a display hint indicating 7140 * the view is not displayed. Applications should not <em>rely</em> on this hint 7141 * as there is no guarantee that they will receive one. 7142 * 7143 * @param hint A hint about whether or not this view is displayed: 7144 * {@link #VISIBLE} or {@link #INVISIBLE}. 7145 */ 7146 public void dispatchDisplayHint(int hint) { 7147 onDisplayHint(hint); 7148 } 7149 7150 /** 7151 * Gives this view a hint about whether is displayed or not. For instance, when 7152 * a View moves out of the screen, it might receives a display hint indicating 7153 * the view is not displayed. Applications should not <em>rely</em> on this hint 7154 * as there is no guarantee that they will receive one. 7155 * 7156 * @param hint A hint about whether or not this view is displayed: 7157 * {@link #VISIBLE} or {@link #INVISIBLE}. 7158 */ 7159 protected void onDisplayHint(int hint) { 7160 } 7161 7162 /** 7163 * Dispatch a window visibility change down the view hierarchy. 7164 * ViewGroups should override to route to their children. 7165 * 7166 * @param visibility The new visibility of the window. 7167 * 7168 * @see #onWindowVisibilityChanged(int) 7169 */ 7170 public void dispatchWindowVisibilityChanged(int visibility) { 7171 onWindowVisibilityChanged(visibility); 7172 } 7173 7174 /** 7175 * Called when the window containing has change its visibility 7176 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7177 * that this tells you whether or not your window is being made visible 7178 * to the window manager; this does <em>not</em> tell you whether or not 7179 * your window is obscured by other windows on the screen, even if it 7180 * is itself visible. 7181 * 7182 * @param visibility The new visibility of the window. 7183 */ 7184 protected void onWindowVisibilityChanged(int visibility) { 7185 if (visibility == VISIBLE) { 7186 initialAwakenScrollBars(); 7187 } 7188 } 7189 7190 /** 7191 * Returns the current visibility of the window this view is attached to 7192 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7193 * 7194 * @return Returns the current visibility of the view's window. 7195 */ 7196 public int getWindowVisibility() { 7197 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7198 } 7199 7200 /** 7201 * Retrieve the overall visible display size in which the window this view is 7202 * attached to has been positioned in. This takes into account screen 7203 * decorations above the window, for both cases where the window itself 7204 * is being position inside of them or the window is being placed under 7205 * then and covered insets are used for the window to position its content 7206 * inside. In effect, this tells you the available area where content can 7207 * be placed and remain visible to users. 7208 * 7209 * <p>This function requires an IPC back to the window manager to retrieve 7210 * the requested information, so should not be used in performance critical 7211 * code like drawing. 7212 * 7213 * @param outRect Filled in with the visible display frame. If the view 7214 * is not attached to a window, this is simply the raw display size. 7215 */ 7216 public void getWindowVisibleDisplayFrame(Rect outRect) { 7217 if (mAttachInfo != null) { 7218 try { 7219 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7220 } catch (RemoteException e) { 7221 return; 7222 } 7223 // XXX This is really broken, and probably all needs to be done 7224 // in the window manager, and we need to know more about whether 7225 // we want the area behind or in front of the IME. 7226 final Rect insets = mAttachInfo.mVisibleInsets; 7227 outRect.left += insets.left; 7228 outRect.top += insets.top; 7229 outRect.right -= insets.right; 7230 outRect.bottom -= insets.bottom; 7231 return; 7232 } 7233 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7234 d.getRectSize(outRect); 7235 } 7236 7237 /** 7238 * Dispatch a notification about a resource configuration change down 7239 * the view hierarchy. 7240 * ViewGroups should override to route to their children. 7241 * 7242 * @param newConfig The new resource configuration. 7243 * 7244 * @see #onConfigurationChanged(android.content.res.Configuration) 7245 */ 7246 public void dispatchConfigurationChanged(Configuration newConfig) { 7247 onConfigurationChanged(newConfig); 7248 } 7249 7250 /** 7251 * Called when the current configuration of the resources being used 7252 * by the application have changed. You can use this to decide when 7253 * to reload resources that can changed based on orientation and other 7254 * configuration characterstics. You only need to use this if you are 7255 * not relying on the normal {@link android.app.Activity} mechanism of 7256 * recreating the activity instance upon a configuration change. 7257 * 7258 * @param newConfig The new resource configuration. 7259 */ 7260 protected void onConfigurationChanged(Configuration newConfig) { 7261 } 7262 7263 /** 7264 * Private function to aggregate all per-view attributes in to the view 7265 * root. 7266 */ 7267 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7268 performCollectViewAttributes(attachInfo, visibility); 7269 } 7270 7271 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7272 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7273 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7274 attachInfo.mKeepScreenOn = true; 7275 } 7276 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7277 ListenerInfo li = mListenerInfo; 7278 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7279 attachInfo.mHasSystemUiListeners = true; 7280 } 7281 } 7282 } 7283 7284 void needGlobalAttributesUpdate(boolean force) { 7285 final AttachInfo ai = mAttachInfo; 7286 if (ai != null) { 7287 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7288 || ai.mHasSystemUiListeners) { 7289 ai.mRecomputeGlobalAttributes = true; 7290 } 7291 } 7292 } 7293 7294 /** 7295 * Returns whether the device is currently in touch mode. Touch mode is entered 7296 * once the user begins interacting with the device by touch, and affects various 7297 * things like whether focus is always visible to the user. 7298 * 7299 * @return Whether the device is in touch mode. 7300 */ 7301 @ViewDebug.ExportedProperty 7302 public boolean isInTouchMode() { 7303 if (mAttachInfo != null) { 7304 return mAttachInfo.mInTouchMode; 7305 } else { 7306 return ViewRootImpl.isInTouchMode(); 7307 } 7308 } 7309 7310 /** 7311 * Returns the context the view is running in, through which it can 7312 * access the current theme, resources, etc. 7313 * 7314 * @return The view's Context. 7315 */ 7316 @ViewDebug.CapturedViewProperty 7317 public final Context getContext() { 7318 return mContext; 7319 } 7320 7321 /** 7322 * Handle a key event before it is processed by any input method 7323 * associated with the view hierarchy. This can be used to intercept 7324 * key events in special situations before the IME consumes them; a 7325 * typical example would be handling the BACK key to update the application's 7326 * UI instead of allowing the IME to see it and close itself. 7327 * 7328 * @param keyCode The value in event.getKeyCode(). 7329 * @param event Description of the key event. 7330 * @return If you handled the event, return true. If you want to allow the 7331 * event to be handled by the next receiver, return false. 7332 */ 7333 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7334 return false; 7335 } 7336 7337 /** 7338 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7339 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7340 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7341 * is released, if the view is enabled and clickable. 7342 * 7343 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7344 * although some may elect to do so in some situations. Do not rely on this to 7345 * catch software key presses. 7346 * 7347 * @param keyCode A key code that represents the button pressed, from 7348 * {@link android.view.KeyEvent}. 7349 * @param event The KeyEvent object that defines the button action. 7350 */ 7351 public boolean onKeyDown(int keyCode, KeyEvent event) { 7352 boolean result = false; 7353 7354 switch (keyCode) { 7355 case KeyEvent.KEYCODE_DPAD_CENTER: 7356 case KeyEvent.KEYCODE_ENTER: { 7357 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7358 return true; 7359 } 7360 // Long clickable items don't necessarily have to be clickable 7361 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7362 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7363 (event.getRepeatCount() == 0)) { 7364 setPressed(true); 7365 checkForLongClick(0); 7366 return true; 7367 } 7368 break; 7369 } 7370 } 7371 return result; 7372 } 7373 7374 /** 7375 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7376 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7377 * the event). 7378 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7379 * although some may elect to do so in some situations. Do not rely on this to 7380 * catch software key presses. 7381 */ 7382 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7383 return false; 7384 } 7385 7386 /** 7387 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7388 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7389 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7390 * {@link KeyEvent#KEYCODE_ENTER} is released. 7391 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7392 * although some may elect to do so in some situations. Do not rely on this to 7393 * catch software key presses. 7394 * 7395 * @param keyCode A key code that represents the button pressed, from 7396 * {@link android.view.KeyEvent}. 7397 * @param event The KeyEvent object that defines the button action. 7398 */ 7399 public boolean onKeyUp(int keyCode, KeyEvent event) { 7400 boolean result = false; 7401 7402 switch (keyCode) { 7403 case KeyEvent.KEYCODE_DPAD_CENTER: 7404 case KeyEvent.KEYCODE_ENTER: { 7405 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7406 return true; 7407 } 7408 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7409 setPressed(false); 7410 7411 if (!mHasPerformedLongPress) { 7412 // This is a tap, so remove the longpress check 7413 removeLongPressCallback(); 7414 7415 result = performClick(); 7416 } 7417 } 7418 break; 7419 } 7420 } 7421 return result; 7422 } 7423 7424 /** 7425 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7426 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7427 * the event). 7428 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7429 * although some may elect to do so in some situations. Do not rely on this to 7430 * catch software key presses. 7431 * 7432 * @param keyCode A key code that represents the button pressed, from 7433 * {@link android.view.KeyEvent}. 7434 * @param repeatCount The number of times the action was made. 7435 * @param event The KeyEvent object that defines the button action. 7436 */ 7437 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7438 return false; 7439 } 7440 7441 /** 7442 * Called on the focused view when a key shortcut event is not handled. 7443 * Override this method to implement local key shortcuts for the View. 7444 * Key shortcuts can also be implemented by setting the 7445 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7446 * 7447 * @param keyCode The value in event.getKeyCode(). 7448 * @param event Description of the key event. 7449 * @return If you handled the event, return true. If you want to allow the 7450 * event to be handled by the next receiver, return false. 7451 */ 7452 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7453 return false; 7454 } 7455 7456 /** 7457 * Check whether the called view is a text editor, in which case it 7458 * would make sense to automatically display a soft input window for 7459 * it. Subclasses should override this if they implement 7460 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7461 * a call on that method would return a non-null InputConnection, and 7462 * they are really a first-class editor that the user would normally 7463 * start typing on when the go into a window containing your view. 7464 * 7465 * <p>The default implementation always returns false. This does 7466 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7467 * will not be called or the user can not otherwise perform edits on your 7468 * view; it is just a hint to the system that this is not the primary 7469 * purpose of this view. 7470 * 7471 * @return Returns true if this view is a text editor, else false. 7472 */ 7473 public boolean onCheckIsTextEditor() { 7474 return false; 7475 } 7476 7477 /** 7478 * Create a new InputConnection for an InputMethod to interact 7479 * with the view. The default implementation returns null, since it doesn't 7480 * support input methods. You can override this to implement such support. 7481 * This is only needed for views that take focus and text input. 7482 * 7483 * <p>When implementing this, you probably also want to implement 7484 * {@link #onCheckIsTextEditor()} to indicate you will return a 7485 * non-null InputConnection. 7486 * 7487 * @param outAttrs Fill in with attribute information about the connection. 7488 */ 7489 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7490 return null; 7491 } 7492 7493 /** 7494 * Called by the {@link android.view.inputmethod.InputMethodManager} 7495 * when a view who is not the current 7496 * input connection target is trying to make a call on the manager. The 7497 * default implementation returns false; you can override this to return 7498 * true for certain views if you are performing InputConnection proxying 7499 * to them. 7500 * @param view The View that is making the InputMethodManager call. 7501 * @return Return true to allow the call, false to reject. 7502 */ 7503 public boolean checkInputConnectionProxy(View view) { 7504 return false; 7505 } 7506 7507 /** 7508 * Show the context menu for this view. It is not safe to hold on to the 7509 * menu after returning from this method. 7510 * 7511 * You should normally not overload this method. Overload 7512 * {@link #onCreateContextMenu(ContextMenu)} or define an 7513 * {@link OnCreateContextMenuListener} to add items to the context menu. 7514 * 7515 * @param menu The context menu to populate 7516 */ 7517 public void createContextMenu(ContextMenu menu) { 7518 ContextMenuInfo menuInfo = getContextMenuInfo(); 7519 7520 // Sets the current menu info so all items added to menu will have 7521 // my extra info set. 7522 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7523 7524 onCreateContextMenu(menu); 7525 ListenerInfo li = mListenerInfo; 7526 if (li != null && li.mOnCreateContextMenuListener != null) { 7527 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7528 } 7529 7530 // Clear the extra information so subsequent items that aren't mine don't 7531 // have my extra info. 7532 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7533 7534 if (mParent != null) { 7535 mParent.createContextMenu(menu); 7536 } 7537 } 7538 7539 /** 7540 * Views should implement this if they have extra information to associate 7541 * with the context menu. The return result is supplied as a parameter to 7542 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7543 * callback. 7544 * 7545 * @return Extra information about the item for which the context menu 7546 * should be shown. This information will vary across different 7547 * subclasses of View. 7548 */ 7549 protected ContextMenuInfo getContextMenuInfo() { 7550 return null; 7551 } 7552 7553 /** 7554 * Views should implement this if the view itself is going to add items to 7555 * the context menu. 7556 * 7557 * @param menu the context menu to populate 7558 */ 7559 protected void onCreateContextMenu(ContextMenu menu) { 7560 } 7561 7562 /** 7563 * Implement this method to handle trackball motion events. The 7564 * <em>relative</em> movement of the trackball since the last event 7565 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7566 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7567 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7568 * they will often be fractional values, representing the more fine-grained 7569 * movement information available from a trackball). 7570 * 7571 * @param event The motion event. 7572 * @return True if the event was handled, false otherwise. 7573 */ 7574 public boolean onTrackballEvent(MotionEvent event) { 7575 return false; 7576 } 7577 7578 /** 7579 * Implement this method to handle generic motion events. 7580 * <p> 7581 * Generic motion events describe joystick movements, mouse hovers, track pad 7582 * touches, scroll wheel movements and other input events. The 7583 * {@link MotionEvent#getSource() source} of the motion event specifies 7584 * the class of input that was received. Implementations of this method 7585 * must examine the bits in the source before processing the event. 7586 * The following code example shows how this is done. 7587 * </p><p> 7588 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7589 * are delivered to the view under the pointer. All other generic motion events are 7590 * delivered to the focused view. 7591 * </p> 7592 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7593 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7594 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7595 * // process the joystick movement... 7596 * return true; 7597 * } 7598 * } 7599 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7600 * switch (event.getAction()) { 7601 * case MotionEvent.ACTION_HOVER_MOVE: 7602 * // process the mouse hover movement... 7603 * return true; 7604 * case MotionEvent.ACTION_SCROLL: 7605 * // process the scroll wheel movement... 7606 * return true; 7607 * } 7608 * } 7609 * return super.onGenericMotionEvent(event); 7610 * }</pre> 7611 * 7612 * @param event The generic motion event being processed. 7613 * @return True if the event was handled, false otherwise. 7614 */ 7615 public boolean onGenericMotionEvent(MotionEvent event) { 7616 return false; 7617 } 7618 7619 /** 7620 * Implement this method to handle hover events. 7621 * <p> 7622 * This method is called whenever a pointer is hovering into, over, or out of the 7623 * bounds of a view and the view is not currently being touched. 7624 * Hover events are represented as pointer events with action 7625 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7626 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7627 * </p> 7628 * <ul> 7629 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7630 * when the pointer enters the bounds of the view.</li> 7631 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7632 * when the pointer has already entered the bounds of the view and has moved.</li> 7633 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7634 * when the pointer has exited the bounds of the view or when the pointer is 7635 * about to go down due to a button click, tap, or similar user action that 7636 * causes the view to be touched.</li> 7637 * </ul> 7638 * <p> 7639 * The view should implement this method to return true to indicate that it is 7640 * handling the hover event, such as by changing its drawable state. 7641 * </p><p> 7642 * The default implementation calls {@link #setHovered} to update the hovered state 7643 * of the view when a hover enter or hover exit event is received, if the view 7644 * is enabled and is clickable. The default implementation also sends hover 7645 * accessibility events. 7646 * </p> 7647 * 7648 * @param event The motion event that describes the hover. 7649 * @return True if the view handled the hover event. 7650 * 7651 * @see #isHovered 7652 * @see #setHovered 7653 * @see #onHoverChanged 7654 */ 7655 public boolean onHoverEvent(MotionEvent event) { 7656 // The root view may receive hover (or touch) events that are outside the bounds of 7657 // the window. This code ensures that we only send accessibility events for 7658 // hovers that are actually within the bounds of the root view. 7659 final int action = event.getActionMasked(); 7660 if (!mSendingHoverAccessibilityEvents) { 7661 if ((action == MotionEvent.ACTION_HOVER_ENTER 7662 || action == MotionEvent.ACTION_HOVER_MOVE) 7663 && !hasHoveredChild() 7664 && pointInView(event.getX(), event.getY())) { 7665 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7666 mSendingHoverAccessibilityEvents = true; 7667 } 7668 } else { 7669 if (action == MotionEvent.ACTION_HOVER_EXIT 7670 || (action == MotionEvent.ACTION_MOVE 7671 && !pointInView(event.getX(), event.getY()))) { 7672 mSendingHoverAccessibilityEvents = false; 7673 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7674 // If the window does not have input focus we take away accessibility 7675 // focus as soon as the user stop hovering over the view. 7676 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7677 getViewRootImpl().setAccessibilityFocus(null, null); 7678 } 7679 } 7680 } 7681 7682 if (isHoverable()) { 7683 switch (action) { 7684 case MotionEvent.ACTION_HOVER_ENTER: 7685 setHovered(true); 7686 break; 7687 case MotionEvent.ACTION_HOVER_EXIT: 7688 setHovered(false); 7689 break; 7690 } 7691 7692 // Dispatch the event to onGenericMotionEvent before returning true. 7693 // This is to provide compatibility with existing applications that 7694 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7695 // break because of the new default handling for hoverable views 7696 // in onHoverEvent. 7697 // Note that onGenericMotionEvent will be called by default when 7698 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7699 dispatchGenericMotionEventInternal(event); 7700 return true; 7701 } 7702 7703 return false; 7704 } 7705 7706 /** 7707 * Returns true if the view should handle {@link #onHoverEvent} 7708 * by calling {@link #setHovered} to change its hovered state. 7709 * 7710 * @return True if the view is hoverable. 7711 */ 7712 private boolean isHoverable() { 7713 final int viewFlags = mViewFlags; 7714 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7715 return false; 7716 } 7717 7718 return (viewFlags & CLICKABLE) == CLICKABLE 7719 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7720 } 7721 7722 /** 7723 * Returns true if the view is currently hovered. 7724 * 7725 * @return True if the view is currently hovered. 7726 * 7727 * @see #setHovered 7728 * @see #onHoverChanged 7729 */ 7730 @ViewDebug.ExportedProperty 7731 public boolean isHovered() { 7732 return (mPrivateFlags & HOVERED) != 0; 7733 } 7734 7735 /** 7736 * Sets whether the view is currently hovered. 7737 * <p> 7738 * Calling this method also changes the drawable state of the view. This 7739 * enables the view to react to hover by using different drawable resources 7740 * to change its appearance. 7741 * </p><p> 7742 * The {@link #onHoverChanged} method is called when the hovered state changes. 7743 * </p> 7744 * 7745 * @param hovered True if the view is hovered. 7746 * 7747 * @see #isHovered 7748 * @see #onHoverChanged 7749 */ 7750 public void setHovered(boolean hovered) { 7751 if (hovered) { 7752 if ((mPrivateFlags & HOVERED) == 0) { 7753 mPrivateFlags |= HOVERED; 7754 refreshDrawableState(); 7755 onHoverChanged(true); 7756 } 7757 } else { 7758 if ((mPrivateFlags & HOVERED) != 0) { 7759 mPrivateFlags &= ~HOVERED; 7760 refreshDrawableState(); 7761 onHoverChanged(false); 7762 } 7763 } 7764 } 7765 7766 /** 7767 * Implement this method to handle hover state changes. 7768 * <p> 7769 * This method is called whenever the hover state changes as a result of a 7770 * call to {@link #setHovered}. 7771 * </p> 7772 * 7773 * @param hovered The current hover state, as returned by {@link #isHovered}. 7774 * 7775 * @see #isHovered 7776 * @see #setHovered 7777 */ 7778 public void onHoverChanged(boolean hovered) { 7779 } 7780 7781 /** 7782 * Implement this method to handle touch screen motion events. 7783 * 7784 * @param event The motion event. 7785 * @return True if the event was handled, false otherwise. 7786 */ 7787 public boolean onTouchEvent(MotionEvent event) { 7788 final int viewFlags = mViewFlags; 7789 7790 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7791 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7792 setPressed(false); 7793 } 7794 // A disabled view that is clickable still consumes the touch 7795 // events, it just doesn't respond to them. 7796 return (((viewFlags & CLICKABLE) == CLICKABLE || 7797 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7798 } 7799 7800 if (mTouchDelegate != null) { 7801 if (mTouchDelegate.onTouchEvent(event)) { 7802 return true; 7803 } 7804 } 7805 7806 if (((viewFlags & CLICKABLE) == CLICKABLE || 7807 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7808 switch (event.getAction()) { 7809 case MotionEvent.ACTION_UP: 7810 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7811 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7812 // take focus if we don't have it already and we should in 7813 // touch mode. 7814 boolean focusTaken = false; 7815 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7816 focusTaken = requestFocus(); 7817 } 7818 7819 if (prepressed) { 7820 // The button is being released before we actually 7821 // showed it as pressed. Make it show the pressed 7822 // state now (before scheduling the click) to ensure 7823 // the user sees it. 7824 setPressed(true); 7825 } 7826 7827 if (!mHasPerformedLongPress) { 7828 // This is a tap, so remove the longpress check 7829 removeLongPressCallback(); 7830 7831 // Only perform take click actions if we were in the pressed state 7832 if (!focusTaken) { 7833 // Use a Runnable and post this rather than calling 7834 // performClick directly. This lets other visual state 7835 // of the view update before click actions start. 7836 if (mPerformClick == null) { 7837 mPerformClick = new PerformClick(); 7838 } 7839 if (!post(mPerformClick)) { 7840 performClick(); 7841 } 7842 } 7843 } 7844 7845 if (mUnsetPressedState == null) { 7846 mUnsetPressedState = new UnsetPressedState(); 7847 } 7848 7849 if (prepressed) { 7850 postDelayed(mUnsetPressedState, 7851 ViewConfiguration.getPressedStateDuration()); 7852 } else if (!post(mUnsetPressedState)) { 7853 // If the post failed, unpress right now 7854 mUnsetPressedState.run(); 7855 } 7856 removeTapCallback(); 7857 } 7858 break; 7859 7860 case MotionEvent.ACTION_DOWN: 7861 mHasPerformedLongPress = false; 7862 7863 if (performButtonActionOnTouchDown(event)) { 7864 break; 7865 } 7866 7867 // Walk up the hierarchy to determine if we're inside a scrolling container. 7868 boolean isInScrollingContainer = isInScrollingContainer(); 7869 7870 // For views inside a scrolling container, delay the pressed feedback for 7871 // a short period in case this is a scroll. 7872 if (isInScrollingContainer) { 7873 mPrivateFlags |= PREPRESSED; 7874 if (mPendingCheckForTap == null) { 7875 mPendingCheckForTap = new CheckForTap(); 7876 } 7877 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7878 } else { 7879 // Not inside a scrolling container, so show the feedback right away 7880 setPressed(true); 7881 checkForLongClick(0); 7882 } 7883 break; 7884 7885 case MotionEvent.ACTION_CANCEL: 7886 setPressed(false); 7887 removeTapCallback(); 7888 break; 7889 7890 case MotionEvent.ACTION_MOVE: 7891 final int x = (int) event.getX(); 7892 final int y = (int) event.getY(); 7893 7894 // Be lenient about moving outside of buttons 7895 if (!pointInView(x, y, mTouchSlop)) { 7896 // Outside button 7897 removeTapCallback(); 7898 if ((mPrivateFlags & PRESSED) != 0) { 7899 // Remove any future long press/tap checks 7900 removeLongPressCallback(); 7901 7902 setPressed(false); 7903 } 7904 } 7905 break; 7906 } 7907 return true; 7908 } 7909 7910 return false; 7911 } 7912 7913 /** 7914 * @hide 7915 */ 7916 public boolean isInScrollingContainer() { 7917 ViewParent p = getParent(); 7918 while (p != null && p instanceof ViewGroup) { 7919 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7920 return true; 7921 } 7922 p = p.getParent(); 7923 } 7924 return false; 7925 } 7926 7927 /** 7928 * Remove the longpress detection timer. 7929 */ 7930 private void removeLongPressCallback() { 7931 if (mPendingCheckForLongPress != null) { 7932 removeCallbacks(mPendingCheckForLongPress); 7933 } 7934 } 7935 7936 /** 7937 * Remove the pending click action 7938 */ 7939 private void removePerformClickCallback() { 7940 if (mPerformClick != null) { 7941 removeCallbacks(mPerformClick); 7942 } 7943 } 7944 7945 /** 7946 * Remove the prepress detection timer. 7947 */ 7948 private void removeUnsetPressCallback() { 7949 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7950 setPressed(false); 7951 removeCallbacks(mUnsetPressedState); 7952 } 7953 } 7954 7955 /** 7956 * Remove the tap detection timer. 7957 */ 7958 private void removeTapCallback() { 7959 if (mPendingCheckForTap != null) { 7960 mPrivateFlags &= ~PREPRESSED; 7961 removeCallbacks(mPendingCheckForTap); 7962 } 7963 } 7964 7965 /** 7966 * Cancels a pending long press. Your subclass can use this if you 7967 * want the context menu to come up if the user presses and holds 7968 * at the same place, but you don't want it to come up if they press 7969 * and then move around enough to cause scrolling. 7970 */ 7971 public void cancelLongPress() { 7972 removeLongPressCallback(); 7973 7974 /* 7975 * The prepressed state handled by the tap callback is a display 7976 * construct, but the tap callback will post a long press callback 7977 * less its own timeout. Remove it here. 7978 */ 7979 removeTapCallback(); 7980 } 7981 7982 /** 7983 * Remove the pending callback for sending a 7984 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7985 */ 7986 private void removeSendViewScrolledAccessibilityEventCallback() { 7987 if (mSendViewScrolledAccessibilityEvent != null) { 7988 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7989 mSendViewScrolledAccessibilityEvent.mIsPending = false; 7990 } 7991 } 7992 7993 /** 7994 * Sets the TouchDelegate for this View. 7995 */ 7996 public void setTouchDelegate(TouchDelegate delegate) { 7997 mTouchDelegate = delegate; 7998 } 7999 8000 /** 8001 * Gets the TouchDelegate for this View. 8002 */ 8003 public TouchDelegate getTouchDelegate() { 8004 return mTouchDelegate; 8005 } 8006 8007 /** 8008 * Set flags controlling behavior of this view. 8009 * 8010 * @param flags Constant indicating the value which should be set 8011 * @param mask Constant indicating the bit range that should be changed 8012 */ 8013 void setFlags(int flags, int mask) { 8014 int old = mViewFlags; 8015 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8016 8017 int changed = mViewFlags ^ old; 8018 if (changed == 0) { 8019 return; 8020 } 8021 int privateFlags = mPrivateFlags; 8022 8023 /* Check if the FOCUSABLE bit has changed */ 8024 if (((changed & FOCUSABLE_MASK) != 0) && 8025 ((privateFlags & HAS_BOUNDS) !=0)) { 8026 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8027 && ((privateFlags & FOCUSED) != 0)) { 8028 /* Give up focus if we are no longer focusable */ 8029 clearFocus(); 8030 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8031 && ((privateFlags & FOCUSED) == 0)) { 8032 /* 8033 * Tell the view system that we are now available to take focus 8034 * if no one else already has it. 8035 */ 8036 if (mParent != null) mParent.focusableViewAvailable(this); 8037 } 8038 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8039 notifyAccessibilityStateChanged(); 8040 } 8041 } 8042 8043 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8044 if ((changed & VISIBILITY_MASK) != 0) { 8045 /* 8046 * If this view is becoming visible, invalidate it in case it changed while 8047 * it was not visible. Marking it drawn ensures that the invalidation will 8048 * go through. 8049 */ 8050 mPrivateFlags |= DRAWN; 8051 invalidate(true); 8052 8053 needGlobalAttributesUpdate(true); 8054 8055 // a view becoming visible is worth notifying the parent 8056 // about in case nothing has focus. even if this specific view 8057 // isn't focusable, it may contain something that is, so let 8058 // the root view try to give this focus if nothing else does. 8059 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8060 mParent.focusableViewAvailable(this); 8061 } 8062 } 8063 } 8064 8065 /* Check if the GONE bit has changed */ 8066 if ((changed & GONE) != 0) { 8067 needGlobalAttributesUpdate(false); 8068 requestLayout(); 8069 8070 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8071 if (hasFocus()) clearFocus(); 8072 clearAccessibilityFocus(); 8073 destroyDrawingCache(); 8074 if (mParent instanceof View) { 8075 // GONE views noop invalidation, so invalidate the parent 8076 ((View) mParent).invalidate(true); 8077 } 8078 // Mark the view drawn to ensure that it gets invalidated properly the next 8079 // time it is visible and gets invalidated 8080 mPrivateFlags |= DRAWN; 8081 } 8082 if (mAttachInfo != null) { 8083 mAttachInfo.mViewVisibilityChanged = true; 8084 } 8085 } 8086 8087 /* Check if the VISIBLE bit has changed */ 8088 if ((changed & INVISIBLE) != 0) { 8089 needGlobalAttributesUpdate(false); 8090 /* 8091 * If this view is becoming invisible, set the DRAWN flag so that 8092 * the next invalidate() will not be skipped. 8093 */ 8094 mPrivateFlags |= DRAWN; 8095 8096 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8097 // root view becoming invisible shouldn't clear focus and accessibility focus 8098 if (getRootView() != this) { 8099 clearFocus(); 8100 clearAccessibilityFocus(); 8101 } 8102 } 8103 if (mAttachInfo != null) { 8104 mAttachInfo.mViewVisibilityChanged = true; 8105 } 8106 } 8107 8108 if ((changed & VISIBILITY_MASK) != 0) { 8109 if (mParent instanceof ViewGroup) { 8110 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8111 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8112 ((View) mParent).invalidate(true); 8113 } else if (mParent != null) { 8114 mParent.invalidateChild(this, null); 8115 } 8116 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8117 } 8118 8119 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8120 destroyDrawingCache(); 8121 } 8122 8123 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8124 destroyDrawingCache(); 8125 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8126 invalidateParentCaches(); 8127 } 8128 8129 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8130 destroyDrawingCache(); 8131 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8132 } 8133 8134 if ((changed & DRAW_MASK) != 0) { 8135 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8136 if (mBackground != null) { 8137 mPrivateFlags &= ~SKIP_DRAW; 8138 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8139 } else { 8140 mPrivateFlags |= SKIP_DRAW; 8141 } 8142 } else { 8143 mPrivateFlags &= ~SKIP_DRAW; 8144 } 8145 requestLayout(); 8146 invalidate(true); 8147 } 8148 8149 if ((changed & KEEP_SCREEN_ON) != 0) { 8150 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8151 mParent.recomputeViewAttributes(this); 8152 } 8153 } 8154 8155 if (AccessibilityManager.getInstance(mContext).isEnabled() 8156 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8157 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8158 notifyAccessibilityStateChanged(); 8159 } 8160 } 8161 8162 /** 8163 * Change the view's z order in the tree, so it's on top of other sibling 8164 * views 8165 */ 8166 public void bringToFront() { 8167 if (mParent != null) { 8168 mParent.bringChildToFront(this); 8169 } 8170 } 8171 8172 /** 8173 * This is called in response to an internal scroll in this view (i.e., the 8174 * view scrolled its own contents). This is typically as a result of 8175 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8176 * called. 8177 * 8178 * @param l Current horizontal scroll origin. 8179 * @param t Current vertical scroll origin. 8180 * @param oldl Previous horizontal scroll origin. 8181 * @param oldt Previous vertical scroll origin. 8182 */ 8183 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8184 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8185 postSendViewScrolledAccessibilityEventCallback(); 8186 } 8187 8188 mBackgroundSizeChanged = true; 8189 8190 final AttachInfo ai = mAttachInfo; 8191 if (ai != null) { 8192 ai.mViewScrollChanged = true; 8193 } 8194 } 8195 8196 /** 8197 * Interface definition for a callback to be invoked when the layout bounds of a view 8198 * changes due to layout processing. 8199 */ 8200 public interface OnLayoutChangeListener { 8201 /** 8202 * Called when the focus state of a view has changed. 8203 * 8204 * @param v The view whose state has changed. 8205 * @param left The new value of the view's left property. 8206 * @param top The new value of the view's top property. 8207 * @param right The new value of the view's right property. 8208 * @param bottom The new value of the view's bottom property. 8209 * @param oldLeft The previous value of the view's left property. 8210 * @param oldTop The previous value of the view's top property. 8211 * @param oldRight The previous value of the view's right property. 8212 * @param oldBottom The previous value of the view's bottom property. 8213 */ 8214 void onLayoutChange(View v, int left, int top, int right, int bottom, 8215 int oldLeft, int oldTop, int oldRight, int oldBottom); 8216 } 8217 8218 /** 8219 * This is called during layout when the size of this view has changed. If 8220 * you were just added to the view hierarchy, you're called with the old 8221 * values of 0. 8222 * 8223 * @param w Current width of this view. 8224 * @param h Current height of this view. 8225 * @param oldw Old width of this view. 8226 * @param oldh Old height of this view. 8227 */ 8228 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8229 } 8230 8231 /** 8232 * Called by draw to draw the child views. This may be overridden 8233 * by derived classes to gain control just before its children are drawn 8234 * (but after its own view has been drawn). 8235 * @param canvas the canvas on which to draw the view 8236 */ 8237 protected void dispatchDraw(Canvas canvas) { 8238 8239 } 8240 8241 /** 8242 * Gets the parent of this view. Note that the parent is a 8243 * ViewParent and not necessarily a View. 8244 * 8245 * @return Parent of this view. 8246 */ 8247 public final ViewParent getParent() { 8248 return mParent; 8249 } 8250 8251 /** 8252 * Set the horizontal scrolled position of your view. This will cause a call to 8253 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8254 * invalidated. 8255 * @param value the x position to scroll to 8256 */ 8257 public void setScrollX(int value) { 8258 scrollTo(value, mScrollY); 8259 } 8260 8261 /** 8262 * Set the vertical scrolled position of your view. This will cause a call to 8263 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8264 * invalidated. 8265 * @param value the y position to scroll to 8266 */ 8267 public void setScrollY(int value) { 8268 scrollTo(mScrollX, value); 8269 } 8270 8271 /** 8272 * Return the scrolled left position of this view. This is the left edge of 8273 * the displayed part of your view. You do not need to draw any pixels 8274 * farther left, since those are outside of the frame of your view on 8275 * screen. 8276 * 8277 * @return The left edge of the displayed part of your view, in pixels. 8278 */ 8279 public final int getScrollX() { 8280 return mScrollX; 8281 } 8282 8283 /** 8284 * Return the scrolled top position of this view. This is the top edge of 8285 * the displayed part of your view. You do not need to draw any pixels above 8286 * it, since those are outside of the frame of your view on screen. 8287 * 8288 * @return The top edge of the displayed part of your view, in pixels. 8289 */ 8290 public final int getScrollY() { 8291 return mScrollY; 8292 } 8293 8294 /** 8295 * Return the width of the your view. 8296 * 8297 * @return The width of your view, in pixels. 8298 */ 8299 @ViewDebug.ExportedProperty(category = "layout") 8300 public final int getWidth() { 8301 return mRight - mLeft; 8302 } 8303 8304 /** 8305 * Return the height of your view. 8306 * 8307 * @return The height of your view, in pixels. 8308 */ 8309 @ViewDebug.ExportedProperty(category = "layout") 8310 public final int getHeight() { 8311 return mBottom - mTop; 8312 } 8313 8314 /** 8315 * Return the visible drawing bounds of your view. Fills in the output 8316 * rectangle with the values from getScrollX(), getScrollY(), 8317 * getWidth(), and getHeight(). 8318 * 8319 * @param outRect The (scrolled) drawing bounds of the view. 8320 */ 8321 public void getDrawingRect(Rect outRect) { 8322 outRect.left = mScrollX; 8323 outRect.top = mScrollY; 8324 outRect.right = mScrollX + (mRight - mLeft); 8325 outRect.bottom = mScrollY + (mBottom - mTop); 8326 } 8327 8328 /** 8329 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8330 * raw width component (that is the result is masked by 8331 * {@link #MEASURED_SIZE_MASK}). 8332 * 8333 * @return The raw measured width of this view. 8334 */ 8335 public final int getMeasuredWidth() { 8336 return mMeasuredWidth & MEASURED_SIZE_MASK; 8337 } 8338 8339 /** 8340 * Return the full width measurement information for this view as computed 8341 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8342 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8343 * This should be used during measurement and layout calculations only. Use 8344 * {@link #getWidth()} to see how wide a view is after layout. 8345 * 8346 * @return The measured width of this view as a bit mask. 8347 */ 8348 public final int getMeasuredWidthAndState() { 8349 return mMeasuredWidth; 8350 } 8351 8352 /** 8353 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8354 * raw width component (that is the result is masked by 8355 * {@link #MEASURED_SIZE_MASK}). 8356 * 8357 * @return The raw measured height of this view. 8358 */ 8359 public final int getMeasuredHeight() { 8360 return mMeasuredHeight & MEASURED_SIZE_MASK; 8361 } 8362 8363 /** 8364 * Return the full height measurement information for this view as computed 8365 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8366 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8367 * This should be used during measurement and layout calculations only. Use 8368 * {@link #getHeight()} to see how wide a view is after layout. 8369 * 8370 * @return The measured width of this view as a bit mask. 8371 */ 8372 public final int getMeasuredHeightAndState() { 8373 return mMeasuredHeight; 8374 } 8375 8376 /** 8377 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8378 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8379 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8380 * and the height component is at the shifted bits 8381 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8382 */ 8383 public final int getMeasuredState() { 8384 return (mMeasuredWidth&MEASURED_STATE_MASK) 8385 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8386 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8387 } 8388 8389 /** 8390 * The transform matrix of this view, which is calculated based on the current 8391 * roation, scale, and pivot properties. 8392 * 8393 * @see #getRotation() 8394 * @see #getScaleX() 8395 * @see #getScaleY() 8396 * @see #getPivotX() 8397 * @see #getPivotY() 8398 * @return The current transform matrix for the view 8399 */ 8400 public Matrix getMatrix() { 8401 if (mTransformationInfo != null) { 8402 updateMatrix(); 8403 return mTransformationInfo.mMatrix; 8404 } 8405 return Matrix.IDENTITY_MATRIX; 8406 } 8407 8408 /** 8409 * Utility function to determine if the value is far enough away from zero to be 8410 * considered non-zero. 8411 * @param value A floating point value to check for zero-ness 8412 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8413 */ 8414 private static boolean nonzero(float value) { 8415 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8416 } 8417 8418 /** 8419 * Returns true if the transform matrix is the identity matrix. 8420 * Recomputes the matrix if necessary. 8421 * 8422 * @return True if the transform matrix is the identity matrix, false otherwise. 8423 */ 8424 final boolean hasIdentityMatrix() { 8425 if (mTransformationInfo != null) { 8426 updateMatrix(); 8427 return mTransformationInfo.mMatrixIsIdentity; 8428 } 8429 return true; 8430 } 8431 8432 void ensureTransformationInfo() { 8433 if (mTransformationInfo == null) { 8434 mTransformationInfo = new TransformationInfo(); 8435 } 8436 } 8437 8438 /** 8439 * Recomputes the transform matrix if necessary. 8440 */ 8441 private void updateMatrix() { 8442 final TransformationInfo info = mTransformationInfo; 8443 if (info == null) { 8444 return; 8445 } 8446 if (info.mMatrixDirty) { 8447 // transform-related properties have changed since the last time someone 8448 // asked for the matrix; recalculate it with the current values 8449 8450 // Figure out if we need to update the pivot point 8451 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8452 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8453 info.mPrevWidth = mRight - mLeft; 8454 info.mPrevHeight = mBottom - mTop; 8455 info.mPivotX = info.mPrevWidth / 2f; 8456 info.mPivotY = info.mPrevHeight / 2f; 8457 } 8458 } 8459 info.mMatrix.reset(); 8460 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8461 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8462 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8463 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8464 } else { 8465 if (info.mCamera == null) { 8466 info.mCamera = new Camera(); 8467 info.matrix3D = new Matrix(); 8468 } 8469 info.mCamera.save(); 8470 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8471 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8472 info.mCamera.getMatrix(info.matrix3D); 8473 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8474 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8475 info.mPivotY + info.mTranslationY); 8476 info.mMatrix.postConcat(info.matrix3D); 8477 info.mCamera.restore(); 8478 } 8479 info.mMatrixDirty = false; 8480 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8481 info.mInverseMatrixDirty = true; 8482 } 8483 } 8484 8485 /** 8486 * When searching for a view to focus this rectangle is used when considering if this view is 8487 * a good candidate for receiving focus. 8488 * 8489 * By default, the rectangle is the {@link #getDrawingRect}) of the view. 8490 * 8491 * @param r The rectangle to fill in, in this view's coordinates. 8492 */ 8493 public void getFocusRect(Rect r) { 8494 getDrawingRect(r); 8495 } 8496 8497 /** 8498 * Utility method to retrieve the inverse of the current mMatrix property. 8499 * We cache the matrix to avoid recalculating it when transform properties 8500 * have not changed. 8501 * 8502 * @return The inverse of the current matrix of this view. 8503 */ 8504 final Matrix getInverseMatrix() { 8505 final TransformationInfo info = mTransformationInfo; 8506 if (info != null) { 8507 updateMatrix(); 8508 if (info.mInverseMatrixDirty) { 8509 if (info.mInverseMatrix == null) { 8510 info.mInverseMatrix = new Matrix(); 8511 } 8512 info.mMatrix.invert(info.mInverseMatrix); 8513 info.mInverseMatrixDirty = false; 8514 } 8515 return info.mInverseMatrix; 8516 } 8517 return Matrix.IDENTITY_MATRIX; 8518 } 8519 8520 /** 8521 * Gets the distance along the Z axis from the camera to this view. 8522 * 8523 * @see #setCameraDistance(float) 8524 * 8525 * @return The distance along the Z axis. 8526 */ 8527 public float getCameraDistance() { 8528 ensureTransformationInfo(); 8529 final float dpi = mResources.getDisplayMetrics().densityDpi; 8530 final TransformationInfo info = mTransformationInfo; 8531 if (info.mCamera == null) { 8532 info.mCamera = new Camera(); 8533 info.matrix3D = new Matrix(); 8534 } 8535 return -(info.mCamera.getLocationZ() * dpi); 8536 } 8537 8538 /** 8539 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8540 * views are drawn) from the camera to this view. The camera's distance 8541 * affects 3D transformations, for instance rotations around the X and Y 8542 * axis. If the rotationX or rotationY properties are changed and this view is 8543 * large (more than half the size of the screen), it is recommended to always 8544 * use a camera distance that's greater than the height (X axis rotation) or 8545 * the width (Y axis rotation) of this view.</p> 8546 * 8547 * <p>The distance of the camera from the view plane can have an affect on the 8548 * perspective distortion of the view when it is rotated around the x or y axis. 8549 * For example, a large distance will result in a large viewing angle, and there 8550 * will not be much perspective distortion of the view as it rotates. A short 8551 * distance may cause much more perspective distortion upon rotation, and can 8552 * also result in some drawing artifacts if the rotated view ends up partially 8553 * behind the camera (which is why the recommendation is to use a distance at 8554 * least as far as the size of the view, if the view is to be rotated.)</p> 8555 * 8556 * <p>The distance is expressed in "depth pixels." The default distance depends 8557 * on the screen density. For instance, on a medium density display, the 8558 * default distance is 1280. On a high density display, the default distance 8559 * is 1920.</p> 8560 * 8561 * <p>If you want to specify a distance that leads to visually consistent 8562 * results across various densities, use the following formula:</p> 8563 * <pre> 8564 * float scale = context.getResources().getDisplayMetrics().density; 8565 * view.setCameraDistance(distance * scale); 8566 * </pre> 8567 * 8568 * <p>The density scale factor of a high density display is 1.5, 8569 * and 1920 = 1280 * 1.5.</p> 8570 * 8571 * @param distance The distance in "depth pixels", if negative the opposite 8572 * value is used 8573 * 8574 * @see #setRotationX(float) 8575 * @see #setRotationY(float) 8576 */ 8577 public void setCameraDistance(float distance) { 8578 invalidateViewProperty(true, false); 8579 8580 ensureTransformationInfo(); 8581 final float dpi = mResources.getDisplayMetrics().densityDpi; 8582 final TransformationInfo info = mTransformationInfo; 8583 if (info.mCamera == null) { 8584 info.mCamera = new Camera(); 8585 info.matrix3D = new Matrix(); 8586 } 8587 8588 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8589 info.mMatrixDirty = true; 8590 8591 invalidateViewProperty(false, false); 8592 if (mDisplayList != null) { 8593 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8594 } 8595 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8596 // View was rejected last time it was drawn by its parent; this may have changed 8597 invalidateParentIfNeeded(); 8598 } 8599 } 8600 8601 /** 8602 * The degrees that the view is rotated around the pivot point. 8603 * 8604 * @see #setRotation(float) 8605 * @see #getPivotX() 8606 * @see #getPivotY() 8607 * 8608 * @return The degrees of rotation. 8609 */ 8610 @ViewDebug.ExportedProperty(category = "drawing") 8611 public float getRotation() { 8612 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8613 } 8614 8615 /** 8616 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8617 * result in clockwise rotation. 8618 * 8619 * @param rotation The degrees of rotation. 8620 * 8621 * @see #getRotation() 8622 * @see #getPivotX() 8623 * @see #getPivotY() 8624 * @see #setRotationX(float) 8625 * @see #setRotationY(float) 8626 * 8627 * @attr ref android.R.styleable#View_rotation 8628 */ 8629 public void setRotation(float rotation) { 8630 ensureTransformationInfo(); 8631 final TransformationInfo info = mTransformationInfo; 8632 if (info.mRotation != rotation) { 8633 // Double-invalidation is necessary to capture view's old and new areas 8634 invalidateViewProperty(true, false); 8635 info.mRotation = rotation; 8636 info.mMatrixDirty = true; 8637 invalidateViewProperty(false, true); 8638 if (mDisplayList != null) { 8639 mDisplayList.setRotation(rotation); 8640 } 8641 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8642 // View was rejected last time it was drawn by its parent; this may have changed 8643 invalidateParentIfNeeded(); 8644 } 8645 } 8646 } 8647 8648 /** 8649 * The degrees that the view is rotated around the vertical axis through the pivot point. 8650 * 8651 * @see #getPivotX() 8652 * @see #getPivotY() 8653 * @see #setRotationY(float) 8654 * 8655 * @return The degrees of Y rotation. 8656 */ 8657 @ViewDebug.ExportedProperty(category = "drawing") 8658 public float getRotationY() { 8659 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8660 } 8661 8662 /** 8663 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8664 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8665 * down the y axis. 8666 * 8667 * When rotating large views, it is recommended to adjust the camera distance 8668 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8669 * 8670 * @param rotationY The degrees of Y rotation. 8671 * 8672 * @see #getRotationY() 8673 * @see #getPivotX() 8674 * @see #getPivotY() 8675 * @see #setRotation(float) 8676 * @see #setRotationX(float) 8677 * @see #setCameraDistance(float) 8678 * 8679 * @attr ref android.R.styleable#View_rotationY 8680 */ 8681 public void setRotationY(float rotationY) { 8682 ensureTransformationInfo(); 8683 final TransformationInfo info = mTransformationInfo; 8684 if (info.mRotationY != rotationY) { 8685 invalidateViewProperty(true, false); 8686 info.mRotationY = rotationY; 8687 info.mMatrixDirty = true; 8688 invalidateViewProperty(false, true); 8689 if (mDisplayList != null) { 8690 mDisplayList.setRotationY(rotationY); 8691 } 8692 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8693 // View was rejected last time it was drawn by its parent; this may have changed 8694 invalidateParentIfNeeded(); 8695 } 8696 } 8697 } 8698 8699 /** 8700 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8701 * 8702 * @see #getPivotX() 8703 * @see #getPivotY() 8704 * @see #setRotationX(float) 8705 * 8706 * @return The degrees of X rotation. 8707 */ 8708 @ViewDebug.ExportedProperty(category = "drawing") 8709 public float getRotationX() { 8710 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8711 } 8712 8713 /** 8714 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8715 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8716 * x axis. 8717 * 8718 * When rotating large views, it is recommended to adjust the camera distance 8719 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8720 * 8721 * @param rotationX The degrees of X rotation. 8722 * 8723 * @see #getRotationX() 8724 * @see #getPivotX() 8725 * @see #getPivotY() 8726 * @see #setRotation(float) 8727 * @see #setRotationY(float) 8728 * @see #setCameraDistance(float) 8729 * 8730 * @attr ref android.R.styleable#View_rotationX 8731 */ 8732 public void setRotationX(float rotationX) { 8733 ensureTransformationInfo(); 8734 final TransformationInfo info = mTransformationInfo; 8735 if (info.mRotationX != rotationX) { 8736 invalidateViewProperty(true, false); 8737 info.mRotationX = rotationX; 8738 info.mMatrixDirty = true; 8739 invalidateViewProperty(false, true); 8740 if (mDisplayList != null) { 8741 mDisplayList.setRotationX(rotationX); 8742 } 8743 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8744 // View was rejected last time it was drawn by its parent; this may have changed 8745 invalidateParentIfNeeded(); 8746 } 8747 } 8748 } 8749 8750 /** 8751 * The amount that the view is scaled in x around the pivot point, as a proportion of 8752 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8753 * 8754 * <p>By default, this is 1.0f. 8755 * 8756 * @see #getPivotX() 8757 * @see #getPivotY() 8758 * @return The scaling factor. 8759 */ 8760 @ViewDebug.ExportedProperty(category = "drawing") 8761 public float getScaleX() { 8762 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8763 } 8764 8765 /** 8766 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8767 * the view's unscaled width. A value of 1 means that no scaling is applied. 8768 * 8769 * @param scaleX The scaling factor. 8770 * @see #getPivotX() 8771 * @see #getPivotY() 8772 * 8773 * @attr ref android.R.styleable#View_scaleX 8774 */ 8775 public void setScaleX(float scaleX) { 8776 ensureTransformationInfo(); 8777 final TransformationInfo info = mTransformationInfo; 8778 if (info.mScaleX != scaleX) { 8779 invalidateViewProperty(true, false); 8780 info.mScaleX = scaleX; 8781 info.mMatrixDirty = true; 8782 invalidateViewProperty(false, true); 8783 if (mDisplayList != null) { 8784 mDisplayList.setScaleX(scaleX); 8785 } 8786 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8787 // View was rejected last time it was drawn by its parent; this may have changed 8788 invalidateParentIfNeeded(); 8789 } 8790 } 8791 } 8792 8793 /** 8794 * The amount that the view is scaled in y around the pivot point, as a proportion of 8795 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8796 * 8797 * <p>By default, this is 1.0f. 8798 * 8799 * @see #getPivotX() 8800 * @see #getPivotY() 8801 * @return The scaling factor. 8802 */ 8803 @ViewDebug.ExportedProperty(category = "drawing") 8804 public float getScaleY() { 8805 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8806 } 8807 8808 /** 8809 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8810 * the view's unscaled width. A value of 1 means that no scaling is applied. 8811 * 8812 * @param scaleY The scaling factor. 8813 * @see #getPivotX() 8814 * @see #getPivotY() 8815 * 8816 * @attr ref android.R.styleable#View_scaleY 8817 */ 8818 public void setScaleY(float scaleY) { 8819 ensureTransformationInfo(); 8820 final TransformationInfo info = mTransformationInfo; 8821 if (info.mScaleY != scaleY) { 8822 invalidateViewProperty(true, false); 8823 info.mScaleY = scaleY; 8824 info.mMatrixDirty = true; 8825 invalidateViewProperty(false, true); 8826 if (mDisplayList != null) { 8827 mDisplayList.setScaleY(scaleY); 8828 } 8829 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8830 // View was rejected last time it was drawn by its parent; this may have changed 8831 invalidateParentIfNeeded(); 8832 } 8833 } 8834 } 8835 8836 /** 8837 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8838 * and {@link #setScaleX(float) scaled}. 8839 * 8840 * @see #getRotation() 8841 * @see #getScaleX() 8842 * @see #getScaleY() 8843 * @see #getPivotY() 8844 * @return The x location of the pivot point. 8845 * 8846 * @attr ref android.R.styleable#View_transformPivotX 8847 */ 8848 @ViewDebug.ExportedProperty(category = "drawing") 8849 public float getPivotX() { 8850 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8851 } 8852 8853 /** 8854 * Sets the x location of the point around which the view is 8855 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8856 * By default, the pivot point is centered on the object. 8857 * Setting this property disables this behavior and causes the view to use only the 8858 * explicitly set pivotX and pivotY values. 8859 * 8860 * @param pivotX The x location of the pivot point. 8861 * @see #getRotation() 8862 * @see #getScaleX() 8863 * @see #getScaleY() 8864 * @see #getPivotY() 8865 * 8866 * @attr ref android.R.styleable#View_transformPivotX 8867 */ 8868 public void setPivotX(float pivotX) { 8869 ensureTransformationInfo(); 8870 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8871 final TransformationInfo info = mTransformationInfo; 8872 if (info.mPivotX != pivotX) { 8873 invalidateViewProperty(true, false); 8874 info.mPivotX = pivotX; 8875 info.mMatrixDirty = true; 8876 invalidateViewProperty(false, true); 8877 if (mDisplayList != null) { 8878 mDisplayList.setPivotX(pivotX); 8879 } 8880 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8881 // View was rejected last time it was drawn by its parent; this may have changed 8882 invalidateParentIfNeeded(); 8883 } 8884 } 8885 } 8886 8887 /** 8888 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8889 * and {@link #setScaleY(float) scaled}. 8890 * 8891 * @see #getRotation() 8892 * @see #getScaleX() 8893 * @see #getScaleY() 8894 * @see #getPivotY() 8895 * @return The y location of the pivot point. 8896 * 8897 * @attr ref android.R.styleable#View_transformPivotY 8898 */ 8899 @ViewDebug.ExportedProperty(category = "drawing") 8900 public float getPivotY() { 8901 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8902 } 8903 8904 /** 8905 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8906 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8907 * Setting this property disables this behavior and causes the view to use only the 8908 * explicitly set pivotX and pivotY values. 8909 * 8910 * @param pivotY The y location of the pivot point. 8911 * @see #getRotation() 8912 * @see #getScaleX() 8913 * @see #getScaleY() 8914 * @see #getPivotY() 8915 * 8916 * @attr ref android.R.styleable#View_transformPivotY 8917 */ 8918 public void setPivotY(float pivotY) { 8919 ensureTransformationInfo(); 8920 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8921 final TransformationInfo info = mTransformationInfo; 8922 if (info.mPivotY != pivotY) { 8923 invalidateViewProperty(true, false); 8924 info.mPivotY = pivotY; 8925 info.mMatrixDirty = true; 8926 invalidateViewProperty(false, true); 8927 if (mDisplayList != null) { 8928 mDisplayList.setPivotY(pivotY); 8929 } 8930 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8931 // View was rejected last time it was drawn by its parent; this may have changed 8932 invalidateParentIfNeeded(); 8933 } 8934 } 8935 } 8936 8937 /** 8938 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8939 * completely transparent and 1 means the view is completely opaque. 8940 * 8941 * <p>By default this is 1.0f. 8942 * @return The opacity of the view. 8943 */ 8944 @ViewDebug.ExportedProperty(category = "drawing") 8945 public float getAlpha() { 8946 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8947 } 8948 8949 /** 8950 * Returns whether this View has content which overlaps. This function, intended to be 8951 * overridden by specific View types, is an optimization when alpha is set on a view. If 8952 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8953 * and then composited it into place, which can be expensive. If the view has no overlapping 8954 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8955 * An example of overlapping rendering is a TextView with a background image, such as a 8956 * Button. An example of non-overlapping rendering is a TextView with no background, or 8957 * an ImageView with only the foreground image. The default implementation returns true; 8958 * subclasses should override if they have cases which can be optimized. 8959 * 8960 * @return true if the content in this view might overlap, false otherwise. 8961 */ 8962 public boolean hasOverlappingRendering() { 8963 return true; 8964 } 8965 8966 /** 8967 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8968 * completely transparent and 1 means the view is completely opaque.</p> 8969 * 8970 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8971 * responsible for applying the opacity itself. Otherwise, calling this method is 8972 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8973 * setting a hardware layer.</p> 8974 * 8975 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8976 * performance implications. It is generally best to use the alpha property sparingly and 8977 * transiently, as in the case of fading animations.</p> 8978 * 8979 * @param alpha The opacity of the view. 8980 * 8981 * @see #setLayerType(int, android.graphics.Paint) 8982 * 8983 * @attr ref android.R.styleable#View_alpha 8984 */ 8985 public void setAlpha(float alpha) { 8986 ensureTransformationInfo(); 8987 if (mTransformationInfo.mAlpha != alpha) { 8988 mTransformationInfo.mAlpha = alpha; 8989 if (onSetAlpha((int) (alpha * 255))) { 8990 mPrivateFlags |= ALPHA_SET; 8991 // subclass is handling alpha - don't optimize rendering cache invalidation 8992 invalidateParentCaches(); 8993 invalidate(true); 8994 } else { 8995 mPrivateFlags &= ~ALPHA_SET; 8996 invalidateViewProperty(true, false); 8997 if (mDisplayList != null) { 8998 mDisplayList.setAlpha(alpha); 8999 } 9000 } 9001 } 9002 } 9003 9004 /** 9005 * Faster version of setAlpha() which performs the same steps except there are 9006 * no calls to invalidate(). The caller of this function should perform proper invalidation 9007 * on the parent and this object. The return value indicates whether the subclass handles 9008 * alpha (the return value for onSetAlpha()). 9009 * 9010 * @param alpha The new value for the alpha property 9011 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9012 * the new value for the alpha property is different from the old value 9013 */ 9014 boolean setAlphaNoInvalidation(float alpha) { 9015 ensureTransformationInfo(); 9016 if (mTransformationInfo.mAlpha != alpha) { 9017 mTransformationInfo.mAlpha = alpha; 9018 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9019 if (subclassHandlesAlpha) { 9020 mPrivateFlags |= ALPHA_SET; 9021 return true; 9022 } else { 9023 mPrivateFlags &= ~ALPHA_SET; 9024 if (mDisplayList != null) { 9025 mDisplayList.setAlpha(alpha); 9026 } 9027 } 9028 } 9029 return false; 9030 } 9031 9032 /** 9033 * Top position of this view relative to its parent. 9034 * 9035 * @return The top of this view, in pixels. 9036 */ 9037 @ViewDebug.CapturedViewProperty 9038 public final int getTop() { 9039 return mTop; 9040 } 9041 9042 /** 9043 * Sets the top position of this view relative to its parent. This method is meant to be called 9044 * by the layout system and should not generally be called otherwise, because the property 9045 * may be changed at any time by the layout. 9046 * 9047 * @param top The top of this view, in pixels. 9048 */ 9049 public final void setTop(int top) { 9050 if (top != mTop) { 9051 updateMatrix(); 9052 final boolean matrixIsIdentity = mTransformationInfo == null 9053 || mTransformationInfo.mMatrixIsIdentity; 9054 if (matrixIsIdentity) { 9055 if (mAttachInfo != null) { 9056 int minTop; 9057 int yLoc; 9058 if (top < mTop) { 9059 minTop = top; 9060 yLoc = top - mTop; 9061 } else { 9062 minTop = mTop; 9063 yLoc = 0; 9064 } 9065 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9066 } 9067 } else { 9068 // Double-invalidation is necessary to capture view's old and new areas 9069 invalidate(true); 9070 } 9071 9072 int width = mRight - mLeft; 9073 int oldHeight = mBottom - mTop; 9074 9075 mTop = top; 9076 if (mDisplayList != null) { 9077 mDisplayList.setTop(mTop); 9078 } 9079 9080 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9081 9082 if (!matrixIsIdentity) { 9083 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9084 // A change in dimension means an auto-centered pivot point changes, too 9085 mTransformationInfo.mMatrixDirty = true; 9086 } 9087 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9088 invalidate(true); 9089 } 9090 mBackgroundSizeChanged = true; 9091 invalidateParentIfNeeded(); 9092 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9093 // View was rejected last time it was drawn by its parent; this may have changed 9094 invalidateParentIfNeeded(); 9095 } 9096 } 9097 } 9098 9099 /** 9100 * Bottom position of this view relative to its parent. 9101 * 9102 * @return The bottom of this view, in pixels. 9103 */ 9104 @ViewDebug.CapturedViewProperty 9105 public final int getBottom() { 9106 return mBottom; 9107 } 9108 9109 /** 9110 * True if this view has changed since the last time being drawn. 9111 * 9112 * @return The dirty state of this view. 9113 */ 9114 public boolean isDirty() { 9115 return (mPrivateFlags & DIRTY_MASK) != 0; 9116 } 9117 9118 /** 9119 * Sets the bottom position of this view relative to its parent. This method is meant to be 9120 * called by the layout system and should not generally be called otherwise, because the 9121 * property may be changed at any time by the layout. 9122 * 9123 * @param bottom The bottom of this view, in pixels. 9124 */ 9125 public final void setBottom(int bottom) { 9126 if (bottom != mBottom) { 9127 updateMatrix(); 9128 final boolean matrixIsIdentity = mTransformationInfo == null 9129 || mTransformationInfo.mMatrixIsIdentity; 9130 if (matrixIsIdentity) { 9131 if (mAttachInfo != null) { 9132 int maxBottom; 9133 if (bottom < mBottom) { 9134 maxBottom = mBottom; 9135 } else { 9136 maxBottom = bottom; 9137 } 9138 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9139 } 9140 } else { 9141 // Double-invalidation is necessary to capture view's old and new areas 9142 invalidate(true); 9143 } 9144 9145 int width = mRight - mLeft; 9146 int oldHeight = mBottom - mTop; 9147 9148 mBottom = bottom; 9149 if (mDisplayList != null) { 9150 mDisplayList.setBottom(mBottom); 9151 } 9152 9153 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9154 9155 if (!matrixIsIdentity) { 9156 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9157 // A change in dimension means an auto-centered pivot point changes, too 9158 mTransformationInfo.mMatrixDirty = true; 9159 } 9160 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9161 invalidate(true); 9162 } 9163 mBackgroundSizeChanged = true; 9164 invalidateParentIfNeeded(); 9165 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9166 // View was rejected last time it was drawn by its parent; this may have changed 9167 invalidateParentIfNeeded(); 9168 } 9169 } 9170 } 9171 9172 /** 9173 * Left position of this view relative to its parent. 9174 * 9175 * @return The left edge of this view, in pixels. 9176 */ 9177 @ViewDebug.CapturedViewProperty 9178 public final int getLeft() { 9179 return mLeft; 9180 } 9181 9182 /** 9183 * Sets the left position of this view relative to its parent. This method is meant to be called 9184 * by the layout system and should not generally be called otherwise, because the property 9185 * may be changed at any time by the layout. 9186 * 9187 * @param left The bottom of this view, in pixels. 9188 */ 9189 public final void setLeft(int left) { 9190 if (left != mLeft) { 9191 updateMatrix(); 9192 final boolean matrixIsIdentity = mTransformationInfo == null 9193 || mTransformationInfo.mMatrixIsIdentity; 9194 if (matrixIsIdentity) { 9195 if (mAttachInfo != null) { 9196 int minLeft; 9197 int xLoc; 9198 if (left < mLeft) { 9199 minLeft = left; 9200 xLoc = left - mLeft; 9201 } else { 9202 minLeft = mLeft; 9203 xLoc = 0; 9204 } 9205 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9206 } 9207 } else { 9208 // Double-invalidation is necessary to capture view's old and new areas 9209 invalidate(true); 9210 } 9211 9212 int oldWidth = mRight - mLeft; 9213 int height = mBottom - mTop; 9214 9215 mLeft = left; 9216 if (mDisplayList != null) { 9217 mDisplayList.setLeft(left); 9218 } 9219 9220 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9221 9222 if (!matrixIsIdentity) { 9223 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9224 // A change in dimension means an auto-centered pivot point changes, too 9225 mTransformationInfo.mMatrixDirty = true; 9226 } 9227 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9228 invalidate(true); 9229 } 9230 mBackgroundSizeChanged = true; 9231 invalidateParentIfNeeded(); 9232 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9233 // View was rejected last time it was drawn by its parent; this may have changed 9234 invalidateParentIfNeeded(); 9235 } 9236 } 9237 } 9238 9239 /** 9240 * Right position of this view relative to its parent. 9241 * 9242 * @return The right edge of this view, in pixels. 9243 */ 9244 @ViewDebug.CapturedViewProperty 9245 public final int getRight() { 9246 return mRight; 9247 } 9248 9249 /** 9250 * Sets the right position of this view relative to its parent. This method is meant to be called 9251 * by the layout system and should not generally be called otherwise, because the property 9252 * may be changed at any time by the layout. 9253 * 9254 * @param right The bottom of this view, in pixels. 9255 */ 9256 public final void setRight(int right) { 9257 if (right != mRight) { 9258 updateMatrix(); 9259 final boolean matrixIsIdentity = mTransformationInfo == null 9260 || mTransformationInfo.mMatrixIsIdentity; 9261 if (matrixIsIdentity) { 9262 if (mAttachInfo != null) { 9263 int maxRight; 9264 if (right < mRight) { 9265 maxRight = mRight; 9266 } else { 9267 maxRight = right; 9268 } 9269 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9270 } 9271 } else { 9272 // Double-invalidation is necessary to capture view's old and new areas 9273 invalidate(true); 9274 } 9275 9276 int oldWidth = mRight - mLeft; 9277 int height = mBottom - mTop; 9278 9279 mRight = right; 9280 if (mDisplayList != null) { 9281 mDisplayList.setRight(mRight); 9282 } 9283 9284 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9285 9286 if (!matrixIsIdentity) { 9287 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9288 // A change in dimension means an auto-centered pivot point changes, too 9289 mTransformationInfo.mMatrixDirty = true; 9290 } 9291 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9292 invalidate(true); 9293 } 9294 mBackgroundSizeChanged = true; 9295 invalidateParentIfNeeded(); 9296 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9297 // View was rejected last time it was drawn by its parent; this may have changed 9298 invalidateParentIfNeeded(); 9299 } 9300 } 9301 } 9302 9303 /** 9304 * The visual x position of this view, in pixels. This is equivalent to the 9305 * {@link #setTranslationX(float) translationX} property plus the current 9306 * {@link #getLeft() left} property. 9307 * 9308 * @return The visual x position of this view, in pixels. 9309 */ 9310 @ViewDebug.ExportedProperty(category = "drawing") 9311 public float getX() { 9312 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9313 } 9314 9315 /** 9316 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9317 * {@link #setTranslationX(float) translationX} property to be the difference between 9318 * the x value passed in and the current {@link #getLeft() left} property. 9319 * 9320 * @param x The visual x position of this view, in pixels. 9321 */ 9322 public void setX(float x) { 9323 setTranslationX(x - mLeft); 9324 } 9325 9326 /** 9327 * The visual y position of this view, in pixels. This is equivalent to the 9328 * {@link #setTranslationY(float) translationY} property plus the current 9329 * {@link #getTop() top} property. 9330 * 9331 * @return The visual y position of this view, in pixels. 9332 */ 9333 @ViewDebug.ExportedProperty(category = "drawing") 9334 public float getY() { 9335 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9336 } 9337 9338 /** 9339 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9340 * {@link #setTranslationY(float) translationY} property to be the difference between 9341 * the y value passed in and the current {@link #getTop() top} property. 9342 * 9343 * @param y The visual y position of this view, in pixels. 9344 */ 9345 public void setY(float y) { 9346 setTranslationY(y - mTop); 9347 } 9348 9349 9350 /** 9351 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9352 * This position is post-layout, in addition to wherever the object's 9353 * layout placed it. 9354 * 9355 * @return The horizontal position of this view relative to its left position, in pixels. 9356 */ 9357 @ViewDebug.ExportedProperty(category = "drawing") 9358 public float getTranslationX() { 9359 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9360 } 9361 9362 /** 9363 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9364 * This effectively positions the object post-layout, in addition to wherever the object's 9365 * layout placed it. 9366 * 9367 * @param translationX The horizontal position of this view relative to its left position, 9368 * in pixels. 9369 * 9370 * @attr ref android.R.styleable#View_translationX 9371 */ 9372 public void setTranslationX(float translationX) { 9373 ensureTransformationInfo(); 9374 final TransformationInfo info = mTransformationInfo; 9375 if (info.mTranslationX != translationX) { 9376 // Double-invalidation is necessary to capture view's old and new areas 9377 invalidateViewProperty(true, false); 9378 info.mTranslationX = translationX; 9379 info.mMatrixDirty = true; 9380 invalidateViewProperty(false, true); 9381 if (mDisplayList != null) { 9382 mDisplayList.setTranslationX(translationX); 9383 } 9384 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9385 // View was rejected last time it was drawn by its parent; this may have changed 9386 invalidateParentIfNeeded(); 9387 } 9388 } 9389 } 9390 9391 /** 9392 * The horizontal location of this view relative to its {@link #getTop() top} position. 9393 * This position is post-layout, in addition to wherever the object's 9394 * layout placed it. 9395 * 9396 * @return The vertical position of this view relative to its top position, 9397 * in pixels. 9398 */ 9399 @ViewDebug.ExportedProperty(category = "drawing") 9400 public float getTranslationY() { 9401 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9402 } 9403 9404 /** 9405 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9406 * This effectively positions the object post-layout, in addition to wherever the object's 9407 * layout placed it. 9408 * 9409 * @param translationY The vertical position of this view relative to its top position, 9410 * in pixels. 9411 * 9412 * @attr ref android.R.styleable#View_translationY 9413 */ 9414 public void setTranslationY(float translationY) { 9415 ensureTransformationInfo(); 9416 final TransformationInfo info = mTransformationInfo; 9417 if (info.mTranslationY != translationY) { 9418 invalidateViewProperty(true, false); 9419 info.mTranslationY = translationY; 9420 info.mMatrixDirty = true; 9421 invalidateViewProperty(false, true); 9422 if (mDisplayList != null) { 9423 mDisplayList.setTranslationY(translationY); 9424 } 9425 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9426 // View was rejected last time it was drawn by its parent; this may have changed 9427 invalidateParentIfNeeded(); 9428 } 9429 } 9430 } 9431 9432 /** 9433 * Hit rectangle in parent's coordinates 9434 * 9435 * @param outRect The hit rectangle of the view. 9436 */ 9437 public void getHitRect(Rect outRect) { 9438 updateMatrix(); 9439 final TransformationInfo info = mTransformationInfo; 9440 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9441 outRect.set(mLeft, mTop, mRight, mBottom); 9442 } else { 9443 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9444 tmpRect.set(-info.mPivotX, -info.mPivotY, 9445 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9446 info.mMatrix.mapRect(tmpRect); 9447 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9448 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9449 } 9450 } 9451 9452 /** 9453 * Determines whether the given point, in local coordinates is inside the view. 9454 */ 9455 /*package*/ final boolean pointInView(float localX, float localY) { 9456 return localX >= 0 && localX < (mRight - mLeft) 9457 && localY >= 0 && localY < (mBottom - mTop); 9458 } 9459 9460 /** 9461 * Utility method to determine whether the given point, in local coordinates, 9462 * is inside the view, where the area of the view is expanded by the slop factor. 9463 * This method is called while processing touch-move events to determine if the event 9464 * is still within the view. 9465 */ 9466 private boolean pointInView(float localX, float localY, float slop) { 9467 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9468 localY < ((mBottom - mTop) + slop); 9469 } 9470 9471 /** 9472 * When a view has focus and the user navigates away from it, the next view is searched for 9473 * starting from the rectangle filled in by this method. 9474 * 9475 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9476 * of the view. However, if your view maintains some idea of internal selection, 9477 * such as a cursor, or a selected row or column, you should override this method and 9478 * fill in a more specific rectangle. 9479 * 9480 * @param r The rectangle to fill in, in this view's coordinates. 9481 */ 9482 public void getFocusedRect(Rect r) { 9483 getDrawingRect(r); 9484 } 9485 9486 /** 9487 * If some part of this view is not clipped by any of its parents, then 9488 * return that area in r in global (root) coordinates. To convert r to local 9489 * coordinates (without taking possible View rotations into account), offset 9490 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9491 * If the view is completely clipped or translated out, return false. 9492 * 9493 * @param r If true is returned, r holds the global coordinates of the 9494 * visible portion of this view. 9495 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9496 * between this view and its root. globalOffet may be null. 9497 * @return true if r is non-empty (i.e. part of the view is visible at the 9498 * root level. 9499 */ 9500 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9501 int width = mRight - mLeft; 9502 int height = mBottom - mTop; 9503 if (width > 0 && height > 0) { 9504 r.set(0, 0, width, height); 9505 if (globalOffset != null) { 9506 globalOffset.set(-mScrollX, -mScrollY); 9507 } 9508 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9509 } 9510 return false; 9511 } 9512 9513 public final boolean getGlobalVisibleRect(Rect r) { 9514 return getGlobalVisibleRect(r, null); 9515 } 9516 9517 public final boolean getLocalVisibleRect(Rect r) { 9518 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9519 if (getGlobalVisibleRect(r, offset)) { 9520 r.offset(-offset.x, -offset.y); // make r local 9521 return true; 9522 } 9523 return false; 9524 } 9525 9526 /** 9527 * Offset this view's vertical location by the specified number of pixels. 9528 * 9529 * @param offset the number of pixels to offset the view by 9530 */ 9531 public void offsetTopAndBottom(int offset) { 9532 if (offset != 0) { 9533 updateMatrix(); 9534 final boolean matrixIsIdentity = mTransformationInfo == null 9535 || mTransformationInfo.mMatrixIsIdentity; 9536 if (matrixIsIdentity) { 9537 if (mDisplayList != null) { 9538 invalidateViewProperty(false, false); 9539 } else { 9540 final ViewParent p = mParent; 9541 if (p != null && mAttachInfo != null) { 9542 final Rect r = mAttachInfo.mTmpInvalRect; 9543 int minTop; 9544 int maxBottom; 9545 int yLoc; 9546 if (offset < 0) { 9547 minTop = mTop + offset; 9548 maxBottom = mBottom; 9549 yLoc = offset; 9550 } else { 9551 minTop = mTop; 9552 maxBottom = mBottom + offset; 9553 yLoc = 0; 9554 } 9555 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9556 p.invalidateChild(this, r); 9557 } 9558 } 9559 } else { 9560 invalidateViewProperty(false, false); 9561 } 9562 9563 mTop += offset; 9564 mBottom += offset; 9565 if (mDisplayList != null) { 9566 mDisplayList.offsetTopBottom(offset); 9567 invalidateViewProperty(false, false); 9568 } else { 9569 if (!matrixIsIdentity) { 9570 invalidateViewProperty(false, true); 9571 } 9572 invalidateParentIfNeeded(); 9573 } 9574 } 9575 } 9576 9577 /** 9578 * Offset this view's horizontal location by the specified amount of pixels. 9579 * 9580 * @param offset the numer of pixels to offset the view by 9581 */ 9582 public void offsetLeftAndRight(int offset) { 9583 if (offset != 0) { 9584 updateMatrix(); 9585 final boolean matrixIsIdentity = mTransformationInfo == null 9586 || mTransformationInfo.mMatrixIsIdentity; 9587 if (matrixIsIdentity) { 9588 if (mDisplayList != null) { 9589 invalidateViewProperty(false, false); 9590 } else { 9591 final ViewParent p = mParent; 9592 if (p != null && mAttachInfo != null) { 9593 final Rect r = mAttachInfo.mTmpInvalRect; 9594 int minLeft; 9595 int maxRight; 9596 if (offset < 0) { 9597 minLeft = mLeft + offset; 9598 maxRight = mRight; 9599 } else { 9600 minLeft = mLeft; 9601 maxRight = mRight + offset; 9602 } 9603 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9604 p.invalidateChild(this, r); 9605 } 9606 } 9607 } else { 9608 invalidateViewProperty(false, false); 9609 } 9610 9611 mLeft += offset; 9612 mRight += offset; 9613 if (mDisplayList != null) { 9614 mDisplayList.offsetLeftRight(offset); 9615 invalidateViewProperty(false, false); 9616 } else { 9617 if (!matrixIsIdentity) { 9618 invalidateViewProperty(false, true); 9619 } 9620 invalidateParentIfNeeded(); 9621 } 9622 } 9623 } 9624 9625 /** 9626 * Get the LayoutParams associated with this view. All views should have 9627 * layout parameters. These supply parameters to the <i>parent</i> of this 9628 * view specifying how it should be arranged. There are many subclasses of 9629 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9630 * of ViewGroup that are responsible for arranging their children. 9631 * 9632 * This method may return null if this View is not attached to a parent 9633 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9634 * was not invoked successfully. When a View is attached to a parent 9635 * ViewGroup, this method must not return null. 9636 * 9637 * @return The LayoutParams associated with this view, or null if no 9638 * parameters have been set yet 9639 */ 9640 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9641 public ViewGroup.LayoutParams getLayoutParams() { 9642 return mLayoutParams; 9643 } 9644 9645 /** 9646 * Set the layout parameters associated with this view. These supply 9647 * parameters to the <i>parent</i> of this view specifying how it should be 9648 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9649 * correspond to the different subclasses of ViewGroup that are responsible 9650 * for arranging their children. 9651 * 9652 * @param params The layout parameters for this view, cannot be null 9653 */ 9654 public void setLayoutParams(ViewGroup.LayoutParams params) { 9655 if (params == null) { 9656 throw new NullPointerException("Layout parameters cannot be null"); 9657 } 9658 mLayoutParams = params; 9659 if (mParent instanceof ViewGroup) { 9660 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9661 } 9662 requestLayout(); 9663 } 9664 9665 /** 9666 * Set the scrolled position of your view. This will cause a call to 9667 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9668 * invalidated. 9669 * @param x the x position to scroll to 9670 * @param y the y position to scroll to 9671 */ 9672 public void scrollTo(int x, int y) { 9673 if (mScrollX != x || mScrollY != y) { 9674 int oldX = mScrollX; 9675 int oldY = mScrollY; 9676 mScrollX = x; 9677 mScrollY = y; 9678 invalidateParentCaches(); 9679 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9680 if (!awakenScrollBars()) { 9681 postInvalidateOnAnimation(); 9682 } 9683 } 9684 } 9685 9686 /** 9687 * Move the scrolled position of your view. This will cause a call to 9688 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9689 * invalidated. 9690 * @param x the amount of pixels to scroll by horizontally 9691 * @param y the amount of pixels to scroll by vertically 9692 */ 9693 public void scrollBy(int x, int y) { 9694 scrollTo(mScrollX + x, mScrollY + y); 9695 } 9696 9697 /** 9698 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9699 * animation to fade the scrollbars out after a default delay. If a subclass 9700 * provides animated scrolling, the start delay should equal the duration 9701 * of the scrolling animation.</p> 9702 * 9703 * <p>The animation starts only if at least one of the scrollbars is 9704 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9705 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9706 * this method returns true, and false otherwise. If the animation is 9707 * started, this method calls {@link #invalidate()}; in that case the 9708 * caller should not call {@link #invalidate()}.</p> 9709 * 9710 * <p>This method should be invoked every time a subclass directly updates 9711 * the scroll parameters.</p> 9712 * 9713 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9714 * and {@link #scrollTo(int, int)}.</p> 9715 * 9716 * @return true if the animation is played, false otherwise 9717 * 9718 * @see #awakenScrollBars(int) 9719 * @see #scrollBy(int, int) 9720 * @see #scrollTo(int, int) 9721 * @see #isHorizontalScrollBarEnabled() 9722 * @see #isVerticalScrollBarEnabled() 9723 * @see #setHorizontalScrollBarEnabled(boolean) 9724 * @see #setVerticalScrollBarEnabled(boolean) 9725 */ 9726 protected boolean awakenScrollBars() { 9727 return mScrollCache != null && 9728 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9729 } 9730 9731 /** 9732 * Trigger the scrollbars to draw. 9733 * This method differs from awakenScrollBars() only in its default duration. 9734 * initialAwakenScrollBars() will show the scroll bars for longer than 9735 * usual to give the user more of a chance to notice them. 9736 * 9737 * @return true if the animation is played, false otherwise. 9738 */ 9739 private boolean initialAwakenScrollBars() { 9740 return mScrollCache != null && 9741 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9742 } 9743 9744 /** 9745 * <p> 9746 * Trigger the scrollbars to draw. When invoked this method starts an 9747 * animation to fade the scrollbars out after a fixed delay. If a subclass 9748 * provides animated scrolling, the start delay should equal the duration of 9749 * the scrolling animation. 9750 * </p> 9751 * 9752 * <p> 9753 * The animation starts only if at least one of the scrollbars is enabled, 9754 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9755 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9756 * this method returns true, and false otherwise. If the animation is 9757 * started, this method calls {@link #invalidate()}; in that case the caller 9758 * should not call {@link #invalidate()}. 9759 * </p> 9760 * 9761 * <p> 9762 * This method should be invoked everytime a subclass directly updates the 9763 * scroll parameters. 9764 * </p> 9765 * 9766 * @param startDelay the delay, in milliseconds, after which the animation 9767 * should start; when the delay is 0, the animation starts 9768 * immediately 9769 * @return true if the animation is played, false otherwise 9770 * 9771 * @see #scrollBy(int, int) 9772 * @see #scrollTo(int, int) 9773 * @see #isHorizontalScrollBarEnabled() 9774 * @see #isVerticalScrollBarEnabled() 9775 * @see #setHorizontalScrollBarEnabled(boolean) 9776 * @see #setVerticalScrollBarEnabled(boolean) 9777 */ 9778 protected boolean awakenScrollBars(int startDelay) { 9779 return awakenScrollBars(startDelay, true); 9780 } 9781 9782 /** 9783 * <p> 9784 * Trigger the scrollbars to draw. When invoked this method starts an 9785 * animation to fade the scrollbars out after a fixed delay. If a subclass 9786 * provides animated scrolling, the start delay should equal the duration of 9787 * the scrolling animation. 9788 * </p> 9789 * 9790 * <p> 9791 * The animation starts only if at least one of the scrollbars is enabled, 9792 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9793 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9794 * this method returns true, and false otherwise. If the animation is 9795 * started, this method calls {@link #invalidate()} if the invalidate parameter 9796 * is set to true; in that case the caller 9797 * should not call {@link #invalidate()}. 9798 * </p> 9799 * 9800 * <p> 9801 * This method should be invoked everytime a subclass directly updates the 9802 * scroll parameters. 9803 * </p> 9804 * 9805 * @param startDelay the delay, in milliseconds, after which the animation 9806 * should start; when the delay is 0, the animation starts 9807 * immediately 9808 * 9809 * @param invalidate Wheter this method should call invalidate 9810 * 9811 * @return true if the animation is played, false otherwise 9812 * 9813 * @see #scrollBy(int, int) 9814 * @see #scrollTo(int, int) 9815 * @see #isHorizontalScrollBarEnabled() 9816 * @see #isVerticalScrollBarEnabled() 9817 * @see #setHorizontalScrollBarEnabled(boolean) 9818 * @see #setVerticalScrollBarEnabled(boolean) 9819 */ 9820 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9821 final ScrollabilityCache scrollCache = mScrollCache; 9822 9823 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9824 return false; 9825 } 9826 9827 if (scrollCache.scrollBar == null) { 9828 scrollCache.scrollBar = new ScrollBarDrawable(); 9829 } 9830 9831 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9832 9833 if (invalidate) { 9834 // Invalidate to show the scrollbars 9835 postInvalidateOnAnimation(); 9836 } 9837 9838 if (scrollCache.state == ScrollabilityCache.OFF) { 9839 // FIXME: this is copied from WindowManagerService. 9840 // We should get this value from the system when it 9841 // is possible to do so. 9842 final int KEY_REPEAT_FIRST_DELAY = 750; 9843 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9844 } 9845 9846 // Tell mScrollCache when we should start fading. This may 9847 // extend the fade start time if one was already scheduled 9848 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9849 scrollCache.fadeStartTime = fadeStartTime; 9850 scrollCache.state = ScrollabilityCache.ON; 9851 9852 // Schedule our fader to run, unscheduling any old ones first 9853 if (mAttachInfo != null) { 9854 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9855 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9856 } 9857 9858 return true; 9859 } 9860 9861 return false; 9862 } 9863 9864 /** 9865 * Do not invalidate views which are not visible and which are not running an animation. They 9866 * will not get drawn and they should not set dirty flags as if they will be drawn 9867 */ 9868 private boolean skipInvalidate() { 9869 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9870 (!(mParent instanceof ViewGroup) || 9871 !((ViewGroup) mParent).isViewTransitioning(this)); 9872 } 9873 /** 9874 * Mark the area defined by dirty as needing to be drawn. If the view is 9875 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9876 * in the future. This must be called from a UI thread. To call from a non-UI 9877 * thread, call {@link #postInvalidate()}. 9878 * 9879 * WARNING: This method is destructive to dirty. 9880 * @param dirty the rectangle representing the bounds of the dirty region 9881 */ 9882 public void invalidate(Rect dirty) { 9883 if (skipInvalidate()) { 9884 return; 9885 } 9886 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9887 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9888 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9889 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9890 mPrivateFlags |= INVALIDATED; 9891 mPrivateFlags |= DIRTY; 9892 final ViewParent p = mParent; 9893 final AttachInfo ai = mAttachInfo; 9894 //noinspection PointlessBooleanExpression,ConstantConditions 9895 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9896 if (p != null && ai != null && ai.mHardwareAccelerated) { 9897 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9898 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9899 p.invalidateChild(this, null); 9900 return; 9901 } 9902 } 9903 if (p != null && ai != null) { 9904 final int scrollX = mScrollX; 9905 final int scrollY = mScrollY; 9906 final Rect r = ai.mTmpInvalRect; 9907 r.set(dirty.left - scrollX, dirty.top - scrollY, 9908 dirty.right - scrollX, dirty.bottom - scrollY); 9909 mParent.invalidateChild(this, r); 9910 } 9911 } 9912 } 9913 9914 /** 9915 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9916 * The coordinates of the dirty rect are relative to the view. 9917 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9918 * will be called at some point in the future. This must be called from 9919 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9920 * @param l the left position of the dirty region 9921 * @param t the top position of the dirty region 9922 * @param r the right position of the dirty region 9923 * @param b the bottom position of the dirty region 9924 */ 9925 public void invalidate(int l, int t, int r, int b) { 9926 if (skipInvalidate()) { 9927 return; 9928 } 9929 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9930 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9931 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9932 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9933 mPrivateFlags |= INVALIDATED; 9934 mPrivateFlags |= DIRTY; 9935 final ViewParent p = mParent; 9936 final AttachInfo ai = mAttachInfo; 9937 //noinspection PointlessBooleanExpression,ConstantConditions 9938 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9939 if (p != null && ai != null && ai.mHardwareAccelerated) { 9940 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9941 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9942 p.invalidateChild(this, null); 9943 return; 9944 } 9945 } 9946 if (p != null && ai != null && l < r && t < b) { 9947 final int scrollX = mScrollX; 9948 final int scrollY = mScrollY; 9949 final Rect tmpr = ai.mTmpInvalRect; 9950 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9951 p.invalidateChild(this, tmpr); 9952 } 9953 } 9954 } 9955 9956 /** 9957 * Invalidate the whole view. If the view is visible, 9958 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9959 * the future. This must be called from a UI thread. To call from a non-UI thread, 9960 * call {@link #postInvalidate()}. 9961 */ 9962 public void invalidate() { 9963 invalidate(true); 9964 } 9965 9966 /** 9967 * This is where the invalidate() work actually happens. A full invalidate() 9968 * causes the drawing cache to be invalidated, but this function can be called with 9969 * invalidateCache set to false to skip that invalidation step for cases that do not 9970 * need it (for example, a component that remains at the same dimensions with the same 9971 * content). 9972 * 9973 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9974 * well. This is usually true for a full invalidate, but may be set to false if the 9975 * View's contents or dimensions have not changed. 9976 */ 9977 void invalidate(boolean invalidateCache) { 9978 if (skipInvalidate()) { 9979 return; 9980 } 9981 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9982 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9983 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9984 mLastIsOpaque = isOpaque(); 9985 mPrivateFlags &= ~DRAWN; 9986 mPrivateFlags |= DIRTY; 9987 if (invalidateCache) { 9988 mPrivateFlags |= INVALIDATED; 9989 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9990 } 9991 final AttachInfo ai = mAttachInfo; 9992 final ViewParent p = mParent; 9993 //noinspection PointlessBooleanExpression,ConstantConditions 9994 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9995 if (p != null && ai != null && ai.mHardwareAccelerated) { 9996 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9997 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9998 p.invalidateChild(this, null); 9999 return; 10000 } 10001 } 10002 10003 if (p != null && ai != null) { 10004 final Rect r = ai.mTmpInvalRect; 10005 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10006 // Don't call invalidate -- we don't want to internally scroll 10007 // our own bounds 10008 p.invalidateChild(this, r); 10009 } 10010 } 10011 } 10012 10013 /** 10014 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10015 * set any flags or handle all of the cases handled by the default invalidation methods. 10016 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10017 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10018 * walk up the hierarchy, transforming the dirty rect as necessary. 10019 * 10020 * The method also handles normal invalidation logic if display list properties are not 10021 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10022 * backup approach, to handle these cases used in the various property-setting methods. 10023 * 10024 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10025 * are not being used in this view 10026 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10027 * list properties are not being used in this view 10028 */ 10029 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10030 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10031 if (invalidateParent) { 10032 invalidateParentCaches(); 10033 } 10034 if (forceRedraw) { 10035 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10036 } 10037 invalidate(false); 10038 } else { 10039 final AttachInfo ai = mAttachInfo; 10040 final ViewParent p = mParent; 10041 if (p != null && ai != null) { 10042 final Rect r = ai.mTmpInvalRect; 10043 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10044 if (mParent instanceof ViewGroup) { 10045 ((ViewGroup) mParent).invalidateChildFast(this, r); 10046 } else { 10047 mParent.invalidateChild(this, r); 10048 } 10049 } 10050 } 10051 } 10052 10053 /** 10054 * Utility method to transform a given Rect by the current matrix of this view. 10055 */ 10056 void transformRect(final Rect rect) { 10057 if (!getMatrix().isIdentity()) { 10058 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10059 boundingRect.set(rect); 10060 getMatrix().mapRect(boundingRect); 10061 rect.set((int) (boundingRect.left - 0.5f), 10062 (int) (boundingRect.top - 0.5f), 10063 (int) (boundingRect.right + 0.5f), 10064 (int) (boundingRect.bottom + 0.5f)); 10065 } 10066 } 10067 10068 /** 10069 * Used to indicate that the parent of this view should clear its caches. This functionality 10070 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10071 * which is necessary when various parent-managed properties of the view change, such as 10072 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10073 * clears the parent caches and does not causes an invalidate event. 10074 * 10075 * @hide 10076 */ 10077 protected void invalidateParentCaches() { 10078 if (mParent instanceof View) { 10079 ((View) mParent).mPrivateFlags |= INVALIDATED; 10080 } 10081 } 10082 10083 /** 10084 * Used to indicate that the parent of this view should be invalidated. This functionality 10085 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10086 * which is necessary when various parent-managed properties of the view change, such as 10087 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10088 * an invalidation event to the parent. 10089 * 10090 * @hide 10091 */ 10092 protected void invalidateParentIfNeeded() { 10093 if (isHardwareAccelerated() && mParent instanceof View) { 10094 ((View) mParent).invalidate(true); 10095 } 10096 } 10097 10098 /** 10099 * Indicates whether this View is opaque. An opaque View guarantees that it will 10100 * draw all the pixels overlapping its bounds using a fully opaque color. 10101 * 10102 * Subclasses of View should override this method whenever possible to indicate 10103 * whether an instance is opaque. Opaque Views are treated in a special way by 10104 * the View hierarchy, possibly allowing it to perform optimizations during 10105 * invalidate/draw passes. 10106 * 10107 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10108 */ 10109 @ViewDebug.ExportedProperty(category = "drawing") 10110 public boolean isOpaque() { 10111 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10112 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10113 } 10114 10115 /** 10116 * @hide 10117 */ 10118 protected void computeOpaqueFlags() { 10119 // Opaque if: 10120 // - Has a background 10121 // - Background is opaque 10122 // - Doesn't have scrollbars or scrollbars are inside overlay 10123 10124 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10125 mPrivateFlags |= OPAQUE_BACKGROUND; 10126 } else { 10127 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10128 } 10129 10130 final int flags = mViewFlags; 10131 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10132 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10133 mPrivateFlags |= OPAQUE_SCROLLBARS; 10134 } else { 10135 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10136 } 10137 } 10138 10139 /** 10140 * @hide 10141 */ 10142 protected boolean hasOpaqueScrollbars() { 10143 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10144 } 10145 10146 /** 10147 * @return A handler associated with the thread running the View. This 10148 * handler can be used to pump events in the UI events queue. 10149 */ 10150 public Handler getHandler() { 10151 if (mAttachInfo != null) { 10152 return mAttachInfo.mHandler; 10153 } 10154 return null; 10155 } 10156 10157 /** 10158 * Gets the view root associated with the View. 10159 * @return The view root, or null if none. 10160 * @hide 10161 */ 10162 public ViewRootImpl getViewRootImpl() { 10163 if (mAttachInfo != null) { 10164 return mAttachInfo.mViewRootImpl; 10165 } 10166 return null; 10167 } 10168 10169 /** 10170 * <p>Causes the Runnable to be added to the message queue. 10171 * The runnable will be run on the user interface thread.</p> 10172 * 10173 * <p>This method can be invoked from outside of the UI thread 10174 * only when this View is attached to a window.</p> 10175 * 10176 * @param action The Runnable that will be executed. 10177 * 10178 * @return Returns true if the Runnable was successfully placed in to the 10179 * message queue. Returns false on failure, usually because the 10180 * looper processing the message queue is exiting. 10181 * 10182 * @see #postDelayed 10183 * @see #removeCallbacks 10184 */ 10185 public boolean post(Runnable action) { 10186 final AttachInfo attachInfo = mAttachInfo; 10187 if (attachInfo != null) { 10188 return attachInfo.mHandler.post(action); 10189 } 10190 // Assume that post will succeed later 10191 ViewRootImpl.getRunQueue().post(action); 10192 return true; 10193 } 10194 10195 /** 10196 * <p>Causes the Runnable to be added to the message queue, to be run 10197 * after the specified amount of time elapses. 10198 * The runnable will be run on the user interface thread.</p> 10199 * 10200 * <p>This method can be invoked from outside of the UI thread 10201 * only when this View is attached to a window.</p> 10202 * 10203 * @param action The Runnable that will be executed. 10204 * @param delayMillis The delay (in milliseconds) until the Runnable 10205 * will be executed. 10206 * 10207 * @return true if the Runnable was successfully placed in to the 10208 * message queue. Returns false on failure, usually because the 10209 * looper processing the message queue is exiting. Note that a 10210 * result of true does not mean the Runnable will be processed -- 10211 * if the looper is quit before the delivery time of the message 10212 * occurs then the message will be dropped. 10213 * 10214 * @see #post 10215 * @see #removeCallbacks 10216 */ 10217 public boolean postDelayed(Runnable action, long delayMillis) { 10218 final AttachInfo attachInfo = mAttachInfo; 10219 if (attachInfo != null) { 10220 return attachInfo.mHandler.postDelayed(action, delayMillis); 10221 } 10222 // Assume that post will succeed later 10223 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10224 return true; 10225 } 10226 10227 /** 10228 * <p>Causes the Runnable to execute on the next animation time step. 10229 * The runnable will be run on the user interface thread.</p> 10230 * 10231 * <p>This method can be invoked from outside of the UI thread 10232 * only when this View is attached to a window.</p> 10233 * 10234 * @param action The Runnable that will be executed. 10235 * 10236 * @see #postOnAnimationDelayed 10237 * @see #removeCallbacks 10238 */ 10239 public void postOnAnimation(Runnable action) { 10240 final AttachInfo attachInfo = mAttachInfo; 10241 if (attachInfo != null) { 10242 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10243 Choreographer.CALLBACK_ANIMATION, action, null); 10244 } else { 10245 // Assume that post will succeed later 10246 ViewRootImpl.getRunQueue().post(action); 10247 } 10248 } 10249 10250 /** 10251 * <p>Causes the Runnable to execute on the next animation time step, 10252 * after the specified amount of time elapses. 10253 * The runnable will be run on the user interface thread.</p> 10254 * 10255 * <p>This method can be invoked from outside of the UI thread 10256 * only when this View is attached to a window.</p> 10257 * 10258 * @param action The Runnable that will be executed. 10259 * @param delayMillis The delay (in milliseconds) until the Runnable 10260 * will be executed. 10261 * 10262 * @see #postOnAnimation 10263 * @see #removeCallbacks 10264 */ 10265 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10266 final AttachInfo attachInfo = mAttachInfo; 10267 if (attachInfo != null) { 10268 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10269 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10270 } else { 10271 // Assume that post will succeed later 10272 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10273 } 10274 } 10275 10276 /** 10277 * <p>Removes the specified Runnable from the message queue.</p> 10278 * 10279 * <p>This method can be invoked from outside of the UI thread 10280 * only when this View is attached to a window.</p> 10281 * 10282 * @param action The Runnable to remove from the message handling queue 10283 * 10284 * @return true if this view could ask the Handler to remove the Runnable, 10285 * false otherwise. When the returned value is true, the Runnable 10286 * may or may not have been actually removed from the message queue 10287 * (for instance, if the Runnable was not in the queue already.) 10288 * 10289 * @see #post 10290 * @see #postDelayed 10291 * @see #postOnAnimation 10292 * @see #postOnAnimationDelayed 10293 */ 10294 public boolean removeCallbacks(Runnable action) { 10295 if (action != null) { 10296 final AttachInfo attachInfo = mAttachInfo; 10297 if (attachInfo != null) { 10298 attachInfo.mHandler.removeCallbacks(action); 10299 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10300 Choreographer.CALLBACK_ANIMATION, action, null); 10301 } else { 10302 // Assume that post will succeed later 10303 ViewRootImpl.getRunQueue().removeCallbacks(action); 10304 } 10305 } 10306 return true; 10307 } 10308 10309 /** 10310 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10311 * Use this to invalidate the View from a non-UI thread.</p> 10312 * 10313 * <p>This method can be invoked from outside of the UI thread 10314 * only when this View is attached to a window.</p> 10315 * 10316 * @see #invalidate() 10317 * @see #postInvalidateDelayed(long) 10318 */ 10319 public void postInvalidate() { 10320 postInvalidateDelayed(0); 10321 } 10322 10323 /** 10324 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10325 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10326 * 10327 * <p>This method can be invoked from outside of the UI thread 10328 * only when this View is attached to a window.</p> 10329 * 10330 * @param left The left coordinate of the rectangle to invalidate. 10331 * @param top The top coordinate of the rectangle to invalidate. 10332 * @param right The right coordinate of the rectangle to invalidate. 10333 * @param bottom The bottom coordinate of the rectangle to invalidate. 10334 * 10335 * @see #invalidate(int, int, int, int) 10336 * @see #invalidate(Rect) 10337 * @see #postInvalidateDelayed(long, int, int, int, int) 10338 */ 10339 public void postInvalidate(int left, int top, int right, int bottom) { 10340 postInvalidateDelayed(0, left, top, right, bottom); 10341 } 10342 10343 /** 10344 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10345 * loop. Waits for the specified amount of time.</p> 10346 * 10347 * <p>This method can be invoked from outside of the UI thread 10348 * only when this View is attached to a window.</p> 10349 * 10350 * @param delayMilliseconds the duration in milliseconds to delay the 10351 * invalidation by 10352 * 10353 * @see #invalidate() 10354 * @see #postInvalidate() 10355 */ 10356 public void postInvalidateDelayed(long delayMilliseconds) { 10357 // We try only with the AttachInfo because there's no point in invalidating 10358 // if we are not attached to our window 10359 final AttachInfo attachInfo = mAttachInfo; 10360 if (attachInfo != null) { 10361 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10362 } 10363 } 10364 10365 /** 10366 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10367 * through the event loop. Waits for the specified amount of time.</p> 10368 * 10369 * <p>This method can be invoked from outside of the UI thread 10370 * only when this View is attached to a window.</p> 10371 * 10372 * @param delayMilliseconds the duration in milliseconds to delay the 10373 * invalidation by 10374 * @param left The left coordinate of the rectangle to invalidate. 10375 * @param top The top coordinate of the rectangle to invalidate. 10376 * @param right The right coordinate of the rectangle to invalidate. 10377 * @param bottom The bottom coordinate of the rectangle to invalidate. 10378 * 10379 * @see #invalidate(int, int, int, int) 10380 * @see #invalidate(Rect) 10381 * @see #postInvalidate(int, int, int, int) 10382 */ 10383 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10384 int right, int bottom) { 10385 10386 // We try only with the AttachInfo because there's no point in invalidating 10387 // if we are not attached to our window 10388 final AttachInfo attachInfo = mAttachInfo; 10389 if (attachInfo != null) { 10390 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10391 info.target = this; 10392 info.left = left; 10393 info.top = top; 10394 info.right = right; 10395 info.bottom = bottom; 10396 10397 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10398 } 10399 } 10400 10401 /** 10402 * <p>Cause an invalidate to happen on the next animation time step, typically the 10403 * next display frame.</p> 10404 * 10405 * <p>This method can be invoked from outside of the UI thread 10406 * only when this View is attached to a window.</p> 10407 * 10408 * @see #invalidate() 10409 */ 10410 public void postInvalidateOnAnimation() { 10411 // We try only with the AttachInfo because there's no point in invalidating 10412 // if we are not attached to our window 10413 final AttachInfo attachInfo = mAttachInfo; 10414 if (attachInfo != null) { 10415 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10416 } 10417 } 10418 10419 /** 10420 * <p>Cause an invalidate of the specified area to happen on the next animation 10421 * time step, typically the next display frame.</p> 10422 * 10423 * <p>This method can be invoked from outside of the UI thread 10424 * only when this View is attached to a window.</p> 10425 * 10426 * @param left The left coordinate of the rectangle to invalidate. 10427 * @param top The top coordinate of the rectangle to invalidate. 10428 * @param right The right coordinate of the rectangle to invalidate. 10429 * @param bottom The bottom coordinate of the rectangle to invalidate. 10430 * 10431 * @see #invalidate(int, int, int, int) 10432 * @see #invalidate(Rect) 10433 */ 10434 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10435 // We try only with the AttachInfo because there's no point in invalidating 10436 // if we are not attached to our window 10437 final AttachInfo attachInfo = mAttachInfo; 10438 if (attachInfo != null) { 10439 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10440 info.target = this; 10441 info.left = left; 10442 info.top = top; 10443 info.right = right; 10444 info.bottom = bottom; 10445 10446 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10447 } 10448 } 10449 10450 /** 10451 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10452 * This event is sent at most once every 10453 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10454 */ 10455 private void postSendViewScrolledAccessibilityEventCallback() { 10456 if (mSendViewScrolledAccessibilityEvent == null) { 10457 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10458 } 10459 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10460 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10461 postDelayed(mSendViewScrolledAccessibilityEvent, 10462 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10463 } 10464 } 10465 10466 /** 10467 * Called by a parent to request that a child update its values for mScrollX 10468 * and mScrollY if necessary. This will typically be done if the child is 10469 * animating a scroll using a {@link android.widget.Scroller Scroller} 10470 * object. 10471 */ 10472 public void computeScroll() { 10473 } 10474 10475 /** 10476 * <p>Indicate whether the horizontal edges are faded when the view is 10477 * scrolled horizontally.</p> 10478 * 10479 * @return true if the horizontal edges should are faded on scroll, false 10480 * otherwise 10481 * 10482 * @see #setHorizontalFadingEdgeEnabled(boolean) 10483 * 10484 * @attr ref android.R.styleable#View_requiresFadingEdge 10485 */ 10486 public boolean isHorizontalFadingEdgeEnabled() { 10487 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10488 } 10489 10490 /** 10491 * <p>Define whether the horizontal edges should be faded when this view 10492 * is scrolled horizontally.</p> 10493 * 10494 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10495 * be faded when the view is scrolled 10496 * horizontally 10497 * 10498 * @see #isHorizontalFadingEdgeEnabled() 10499 * 10500 * @attr ref android.R.styleable#View_requiresFadingEdge 10501 */ 10502 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10503 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10504 if (horizontalFadingEdgeEnabled) { 10505 initScrollCache(); 10506 } 10507 10508 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10509 } 10510 } 10511 10512 /** 10513 * <p>Indicate whether the vertical edges are faded when the view is 10514 * scrolled horizontally.</p> 10515 * 10516 * @return true if the vertical edges should are faded on scroll, false 10517 * otherwise 10518 * 10519 * @see #setVerticalFadingEdgeEnabled(boolean) 10520 * 10521 * @attr ref android.R.styleable#View_requiresFadingEdge 10522 */ 10523 public boolean isVerticalFadingEdgeEnabled() { 10524 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10525 } 10526 10527 /** 10528 * <p>Define whether the vertical edges should be faded when this view 10529 * is scrolled vertically.</p> 10530 * 10531 * @param verticalFadingEdgeEnabled true if the vertical edges should 10532 * be faded when the view is scrolled 10533 * vertically 10534 * 10535 * @see #isVerticalFadingEdgeEnabled() 10536 * 10537 * @attr ref android.R.styleable#View_requiresFadingEdge 10538 */ 10539 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10540 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10541 if (verticalFadingEdgeEnabled) { 10542 initScrollCache(); 10543 } 10544 10545 mViewFlags ^= FADING_EDGE_VERTICAL; 10546 } 10547 } 10548 10549 /** 10550 * Returns the strength, or intensity, of the top faded edge. The strength is 10551 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10552 * returns 0.0 or 1.0 but no value in between. 10553 * 10554 * Subclasses should override this method to provide a smoother fade transition 10555 * when scrolling occurs. 10556 * 10557 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10558 */ 10559 protected float getTopFadingEdgeStrength() { 10560 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10561 } 10562 10563 /** 10564 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10565 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10566 * returns 0.0 or 1.0 but no value in between. 10567 * 10568 * Subclasses should override this method to provide a smoother fade transition 10569 * when scrolling occurs. 10570 * 10571 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10572 */ 10573 protected float getBottomFadingEdgeStrength() { 10574 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10575 computeVerticalScrollRange() ? 1.0f : 0.0f; 10576 } 10577 10578 /** 10579 * Returns the strength, or intensity, of the left faded edge. The strength is 10580 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10581 * returns 0.0 or 1.0 but no value in between. 10582 * 10583 * Subclasses should override this method to provide a smoother fade transition 10584 * when scrolling occurs. 10585 * 10586 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10587 */ 10588 protected float getLeftFadingEdgeStrength() { 10589 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10590 } 10591 10592 /** 10593 * Returns the strength, or intensity, of the right faded edge. The strength is 10594 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10595 * returns 0.0 or 1.0 but no value in between. 10596 * 10597 * Subclasses should override this method to provide a smoother fade transition 10598 * when scrolling occurs. 10599 * 10600 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10601 */ 10602 protected float getRightFadingEdgeStrength() { 10603 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10604 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10605 } 10606 10607 /** 10608 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10609 * scrollbar is not drawn by default.</p> 10610 * 10611 * @return true if the horizontal scrollbar should be painted, false 10612 * otherwise 10613 * 10614 * @see #setHorizontalScrollBarEnabled(boolean) 10615 */ 10616 public boolean isHorizontalScrollBarEnabled() { 10617 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10618 } 10619 10620 /** 10621 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10622 * scrollbar is not drawn by default.</p> 10623 * 10624 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10625 * be painted 10626 * 10627 * @see #isHorizontalScrollBarEnabled() 10628 */ 10629 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10630 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10631 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10632 computeOpaqueFlags(); 10633 resolvePadding(); 10634 } 10635 } 10636 10637 /** 10638 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10639 * scrollbar is not drawn by default.</p> 10640 * 10641 * @return true if the vertical scrollbar should be painted, false 10642 * otherwise 10643 * 10644 * @see #setVerticalScrollBarEnabled(boolean) 10645 */ 10646 public boolean isVerticalScrollBarEnabled() { 10647 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10648 } 10649 10650 /** 10651 * <p>Define whether the vertical scrollbar should be drawn or not. The 10652 * scrollbar is not drawn by default.</p> 10653 * 10654 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10655 * be painted 10656 * 10657 * @see #isVerticalScrollBarEnabled() 10658 */ 10659 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10660 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10661 mViewFlags ^= SCROLLBARS_VERTICAL; 10662 computeOpaqueFlags(); 10663 resolvePadding(); 10664 } 10665 } 10666 10667 /** 10668 * @hide 10669 */ 10670 protected void recomputePadding() { 10671 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10672 } 10673 10674 /** 10675 * Define whether scrollbars will fade when the view is not scrolling. 10676 * 10677 * @param fadeScrollbars wheter to enable fading 10678 * 10679 * @attr ref android.R.styleable#View_fadeScrollbars 10680 */ 10681 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10682 initScrollCache(); 10683 final ScrollabilityCache scrollabilityCache = mScrollCache; 10684 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10685 if (fadeScrollbars) { 10686 scrollabilityCache.state = ScrollabilityCache.OFF; 10687 } else { 10688 scrollabilityCache.state = ScrollabilityCache.ON; 10689 } 10690 } 10691 10692 /** 10693 * 10694 * Returns true if scrollbars will fade when this view is not scrolling 10695 * 10696 * @return true if scrollbar fading is enabled 10697 * 10698 * @attr ref android.R.styleable#View_fadeScrollbars 10699 */ 10700 public boolean isScrollbarFadingEnabled() { 10701 return mScrollCache != null && mScrollCache.fadeScrollBars; 10702 } 10703 10704 /** 10705 * 10706 * Returns the delay before scrollbars fade. 10707 * 10708 * @return the delay before scrollbars fade 10709 * 10710 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10711 */ 10712 public int getScrollBarDefaultDelayBeforeFade() { 10713 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10714 mScrollCache.scrollBarDefaultDelayBeforeFade; 10715 } 10716 10717 /** 10718 * Define the delay before scrollbars fade. 10719 * 10720 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10721 * 10722 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10723 */ 10724 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10725 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10726 } 10727 10728 /** 10729 * 10730 * Returns the scrollbar fade duration. 10731 * 10732 * @return the scrollbar fade duration 10733 * 10734 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10735 */ 10736 public int getScrollBarFadeDuration() { 10737 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10738 mScrollCache.scrollBarFadeDuration; 10739 } 10740 10741 /** 10742 * Define the scrollbar fade duration. 10743 * 10744 * @param scrollBarFadeDuration - the scrollbar fade duration 10745 * 10746 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10747 */ 10748 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10749 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10750 } 10751 10752 /** 10753 * 10754 * Returns the scrollbar size. 10755 * 10756 * @return the scrollbar size 10757 * 10758 * @attr ref android.R.styleable#View_scrollbarSize 10759 */ 10760 public int getScrollBarSize() { 10761 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10762 mScrollCache.scrollBarSize; 10763 } 10764 10765 /** 10766 * Define the scrollbar size. 10767 * 10768 * @param scrollBarSize - the scrollbar size 10769 * 10770 * @attr ref android.R.styleable#View_scrollbarSize 10771 */ 10772 public void setScrollBarSize(int scrollBarSize) { 10773 getScrollCache().scrollBarSize = scrollBarSize; 10774 } 10775 10776 /** 10777 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10778 * inset. When inset, they add to the padding of the view. And the scrollbars 10779 * can be drawn inside the padding area or on the edge of the view. For example, 10780 * if a view has a background drawable and you want to draw the scrollbars 10781 * inside the padding specified by the drawable, you can use 10782 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10783 * appear at the edge of the view, ignoring the padding, then you can use 10784 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10785 * @param style the style of the scrollbars. Should be one of 10786 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10787 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10788 * @see #SCROLLBARS_INSIDE_OVERLAY 10789 * @see #SCROLLBARS_INSIDE_INSET 10790 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10791 * @see #SCROLLBARS_OUTSIDE_INSET 10792 * 10793 * @attr ref android.R.styleable#View_scrollbarStyle 10794 */ 10795 public void setScrollBarStyle(int style) { 10796 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10797 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10798 computeOpaqueFlags(); 10799 resolvePadding(); 10800 } 10801 } 10802 10803 /** 10804 * <p>Returns the current scrollbar style.</p> 10805 * @return the current scrollbar style 10806 * @see #SCROLLBARS_INSIDE_OVERLAY 10807 * @see #SCROLLBARS_INSIDE_INSET 10808 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10809 * @see #SCROLLBARS_OUTSIDE_INSET 10810 * 10811 * @attr ref android.R.styleable#View_scrollbarStyle 10812 */ 10813 @ViewDebug.ExportedProperty(mapping = { 10814 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10815 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10816 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10817 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10818 }) 10819 public int getScrollBarStyle() { 10820 return mViewFlags & SCROLLBARS_STYLE_MASK; 10821 } 10822 10823 /** 10824 * <p>Compute the horizontal range that the horizontal scrollbar 10825 * represents.</p> 10826 * 10827 * <p>The range is expressed in arbitrary units that must be the same as the 10828 * units used by {@link #computeHorizontalScrollExtent()} and 10829 * {@link #computeHorizontalScrollOffset()}.</p> 10830 * 10831 * <p>The default range is the drawing width of this view.</p> 10832 * 10833 * @return the total horizontal range represented by the horizontal 10834 * scrollbar 10835 * 10836 * @see #computeHorizontalScrollExtent() 10837 * @see #computeHorizontalScrollOffset() 10838 * @see android.widget.ScrollBarDrawable 10839 */ 10840 protected int computeHorizontalScrollRange() { 10841 return getWidth(); 10842 } 10843 10844 /** 10845 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10846 * within the horizontal range. This value is used to compute the position 10847 * of the thumb within the scrollbar's track.</p> 10848 * 10849 * <p>The range is expressed in arbitrary units that must be the same as the 10850 * units used by {@link #computeHorizontalScrollRange()} and 10851 * {@link #computeHorizontalScrollExtent()}.</p> 10852 * 10853 * <p>The default offset is the scroll offset of this view.</p> 10854 * 10855 * @return the horizontal offset of the scrollbar's thumb 10856 * 10857 * @see #computeHorizontalScrollRange() 10858 * @see #computeHorizontalScrollExtent() 10859 * @see android.widget.ScrollBarDrawable 10860 */ 10861 protected int computeHorizontalScrollOffset() { 10862 return mScrollX; 10863 } 10864 10865 /** 10866 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10867 * within the horizontal range. This value is used to compute the length 10868 * of the thumb within the scrollbar's track.</p> 10869 * 10870 * <p>The range is expressed in arbitrary units that must be the same as the 10871 * units used by {@link #computeHorizontalScrollRange()} and 10872 * {@link #computeHorizontalScrollOffset()}.</p> 10873 * 10874 * <p>The default extent is the drawing width of this view.</p> 10875 * 10876 * @return the horizontal extent of the scrollbar's thumb 10877 * 10878 * @see #computeHorizontalScrollRange() 10879 * @see #computeHorizontalScrollOffset() 10880 * @see android.widget.ScrollBarDrawable 10881 */ 10882 protected int computeHorizontalScrollExtent() { 10883 return getWidth(); 10884 } 10885 10886 /** 10887 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10888 * 10889 * <p>The range is expressed in arbitrary units that must be the same as the 10890 * units used by {@link #computeVerticalScrollExtent()} and 10891 * {@link #computeVerticalScrollOffset()}.</p> 10892 * 10893 * @return the total vertical range represented by the vertical scrollbar 10894 * 10895 * <p>The default range is the drawing height of this view.</p> 10896 * 10897 * @see #computeVerticalScrollExtent() 10898 * @see #computeVerticalScrollOffset() 10899 * @see android.widget.ScrollBarDrawable 10900 */ 10901 protected int computeVerticalScrollRange() { 10902 return getHeight(); 10903 } 10904 10905 /** 10906 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10907 * within the horizontal range. This value is used to compute the position 10908 * of the thumb within the scrollbar's track.</p> 10909 * 10910 * <p>The range is expressed in arbitrary units that must be the same as the 10911 * units used by {@link #computeVerticalScrollRange()} and 10912 * {@link #computeVerticalScrollExtent()}.</p> 10913 * 10914 * <p>The default offset is the scroll offset of this view.</p> 10915 * 10916 * @return the vertical offset of the scrollbar's thumb 10917 * 10918 * @see #computeVerticalScrollRange() 10919 * @see #computeVerticalScrollExtent() 10920 * @see android.widget.ScrollBarDrawable 10921 */ 10922 protected int computeVerticalScrollOffset() { 10923 return mScrollY; 10924 } 10925 10926 /** 10927 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10928 * within the vertical range. This value is used to compute the length 10929 * of the thumb within the scrollbar's track.</p> 10930 * 10931 * <p>The range is expressed in arbitrary units that must be the same as the 10932 * units used by {@link #computeVerticalScrollRange()} and 10933 * {@link #computeVerticalScrollOffset()}.</p> 10934 * 10935 * <p>The default extent is the drawing height of this view.</p> 10936 * 10937 * @return the vertical extent of the scrollbar's thumb 10938 * 10939 * @see #computeVerticalScrollRange() 10940 * @see #computeVerticalScrollOffset() 10941 * @see android.widget.ScrollBarDrawable 10942 */ 10943 protected int computeVerticalScrollExtent() { 10944 return getHeight(); 10945 } 10946 10947 /** 10948 * Check if this view can be scrolled horizontally in a certain direction. 10949 * 10950 * @param direction Negative to check scrolling left, positive to check scrolling right. 10951 * @return true if this view can be scrolled in the specified direction, false otherwise. 10952 */ 10953 public boolean canScrollHorizontally(int direction) { 10954 final int offset = computeHorizontalScrollOffset(); 10955 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10956 if (range == 0) return false; 10957 if (direction < 0) { 10958 return offset > 0; 10959 } else { 10960 return offset < range - 1; 10961 } 10962 } 10963 10964 /** 10965 * Check if this view can be scrolled vertically in a certain direction. 10966 * 10967 * @param direction Negative to check scrolling up, positive to check scrolling down. 10968 * @return true if this view can be scrolled in the specified direction, false otherwise. 10969 */ 10970 public boolean canScrollVertically(int direction) { 10971 final int offset = computeVerticalScrollOffset(); 10972 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10973 if (range == 0) return false; 10974 if (direction < 0) { 10975 return offset > 0; 10976 } else { 10977 return offset < range - 1; 10978 } 10979 } 10980 10981 /** 10982 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10983 * scrollbars are painted only if they have been awakened first.</p> 10984 * 10985 * @param canvas the canvas on which to draw the scrollbars 10986 * 10987 * @see #awakenScrollBars(int) 10988 */ 10989 protected final void onDrawScrollBars(Canvas canvas) { 10990 // scrollbars are drawn only when the animation is running 10991 final ScrollabilityCache cache = mScrollCache; 10992 if (cache != null) { 10993 10994 int state = cache.state; 10995 10996 if (state == ScrollabilityCache.OFF) { 10997 return; 10998 } 10999 11000 boolean invalidate = false; 11001 11002 if (state == ScrollabilityCache.FADING) { 11003 // We're fading -- get our fade interpolation 11004 if (cache.interpolatorValues == null) { 11005 cache.interpolatorValues = new float[1]; 11006 } 11007 11008 float[] values = cache.interpolatorValues; 11009 11010 // Stops the animation if we're done 11011 if (cache.scrollBarInterpolator.timeToValues(values) == 11012 Interpolator.Result.FREEZE_END) { 11013 cache.state = ScrollabilityCache.OFF; 11014 } else { 11015 cache.scrollBar.setAlpha(Math.round(values[0])); 11016 } 11017 11018 // This will make the scroll bars inval themselves after 11019 // drawing. We only want this when we're fading so that 11020 // we prevent excessive redraws 11021 invalidate = true; 11022 } else { 11023 // We're just on -- but we may have been fading before so 11024 // reset alpha 11025 cache.scrollBar.setAlpha(255); 11026 } 11027 11028 11029 final int viewFlags = mViewFlags; 11030 11031 final boolean drawHorizontalScrollBar = 11032 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11033 final boolean drawVerticalScrollBar = 11034 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11035 && !isVerticalScrollBarHidden(); 11036 11037 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11038 final int width = mRight - mLeft; 11039 final int height = mBottom - mTop; 11040 11041 final ScrollBarDrawable scrollBar = cache.scrollBar; 11042 11043 final int scrollX = mScrollX; 11044 final int scrollY = mScrollY; 11045 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11046 11047 int left, top, right, bottom; 11048 11049 if (drawHorizontalScrollBar) { 11050 int size = scrollBar.getSize(false); 11051 if (size <= 0) { 11052 size = cache.scrollBarSize; 11053 } 11054 11055 scrollBar.setParameters(computeHorizontalScrollRange(), 11056 computeHorizontalScrollOffset(), 11057 computeHorizontalScrollExtent(), false); 11058 final int verticalScrollBarGap = drawVerticalScrollBar ? 11059 getVerticalScrollbarWidth() : 0; 11060 top = scrollY + height - size - (mUserPaddingBottom & inside); 11061 left = scrollX + (mPaddingLeft & inside); 11062 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11063 bottom = top + size; 11064 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11065 if (invalidate) { 11066 invalidate(left, top, right, bottom); 11067 } 11068 } 11069 11070 if (drawVerticalScrollBar) { 11071 int size = scrollBar.getSize(true); 11072 if (size <= 0) { 11073 size = cache.scrollBarSize; 11074 } 11075 11076 scrollBar.setParameters(computeVerticalScrollRange(), 11077 computeVerticalScrollOffset(), 11078 computeVerticalScrollExtent(), true); 11079 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11080 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11081 verticalScrollbarPosition = isLayoutRtl() ? 11082 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11083 } 11084 switch (verticalScrollbarPosition) { 11085 default: 11086 case SCROLLBAR_POSITION_RIGHT: 11087 left = scrollX + width - size - (mUserPaddingRight & inside); 11088 break; 11089 case SCROLLBAR_POSITION_LEFT: 11090 left = scrollX + (mUserPaddingLeft & inside); 11091 break; 11092 } 11093 top = scrollY + (mPaddingTop & inside); 11094 right = left + size; 11095 bottom = scrollY + height - (mUserPaddingBottom & inside); 11096 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11097 if (invalidate) { 11098 invalidate(left, top, right, bottom); 11099 } 11100 } 11101 } 11102 } 11103 } 11104 11105 /** 11106 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11107 * FastScroller is visible. 11108 * @return whether to temporarily hide the vertical scrollbar 11109 * @hide 11110 */ 11111 protected boolean isVerticalScrollBarHidden() { 11112 return false; 11113 } 11114 11115 /** 11116 * <p>Draw the horizontal scrollbar if 11117 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11118 * 11119 * @param canvas the canvas on which to draw the scrollbar 11120 * @param scrollBar the scrollbar's drawable 11121 * 11122 * @see #isHorizontalScrollBarEnabled() 11123 * @see #computeHorizontalScrollRange() 11124 * @see #computeHorizontalScrollExtent() 11125 * @see #computeHorizontalScrollOffset() 11126 * @see android.widget.ScrollBarDrawable 11127 * @hide 11128 */ 11129 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11130 int l, int t, int r, int b) { 11131 scrollBar.setBounds(l, t, r, b); 11132 scrollBar.draw(canvas); 11133 } 11134 11135 /** 11136 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11137 * returns true.</p> 11138 * 11139 * @param canvas the canvas on which to draw the scrollbar 11140 * @param scrollBar the scrollbar's drawable 11141 * 11142 * @see #isVerticalScrollBarEnabled() 11143 * @see #computeVerticalScrollRange() 11144 * @see #computeVerticalScrollExtent() 11145 * @see #computeVerticalScrollOffset() 11146 * @see android.widget.ScrollBarDrawable 11147 * @hide 11148 */ 11149 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11150 int l, int t, int r, int b) { 11151 scrollBar.setBounds(l, t, r, b); 11152 scrollBar.draw(canvas); 11153 } 11154 11155 /** 11156 * Implement this to do your drawing. 11157 * 11158 * @param canvas the canvas on which the background will be drawn 11159 */ 11160 protected void onDraw(Canvas canvas) { 11161 } 11162 11163 /* 11164 * Caller is responsible for calling requestLayout if necessary. 11165 * (This allows addViewInLayout to not request a new layout.) 11166 */ 11167 void assignParent(ViewParent parent) { 11168 if (mParent == null) { 11169 mParent = parent; 11170 } else if (parent == null) { 11171 mParent = null; 11172 } else { 11173 throw new RuntimeException("view " + this + " being added, but" 11174 + " it already has a parent"); 11175 } 11176 } 11177 11178 /** 11179 * This is called when the view is attached to a window. At this point it 11180 * has a Surface and will start drawing. Note that this function is 11181 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11182 * however it may be called any time before the first onDraw -- including 11183 * before or after {@link #onMeasure(int, int)}. 11184 * 11185 * @see #onDetachedFromWindow() 11186 */ 11187 protected void onAttachedToWindow() { 11188 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11189 mParent.requestTransparentRegion(this); 11190 } 11191 11192 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11193 initialAwakenScrollBars(); 11194 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11195 } 11196 11197 jumpDrawablesToCurrentState(); 11198 11199 // Order is important here: LayoutDirection MUST be resolved before Padding 11200 // and TextDirection 11201 resolveLayoutDirection(); 11202 resolvePadding(); 11203 resolveTextDirection(); 11204 resolveTextAlignment(); 11205 11206 clearAccessibilityFocus(); 11207 if (isFocused()) { 11208 InputMethodManager imm = InputMethodManager.peekInstance(); 11209 imm.focusIn(this); 11210 } 11211 11212 if (mAttachInfo != null && mDisplayList != null) { 11213 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11214 } 11215 } 11216 11217 /** 11218 * @see #onScreenStateChanged(int) 11219 */ 11220 void dispatchScreenStateChanged(int screenState) { 11221 onScreenStateChanged(screenState); 11222 } 11223 11224 /** 11225 * This method is called whenever the state of the screen this view is 11226 * attached to changes. A state change will usually occurs when the screen 11227 * turns on or off (whether it happens automatically or the user does it 11228 * manually.) 11229 * 11230 * @param screenState The new state of the screen. Can be either 11231 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11232 */ 11233 public void onScreenStateChanged(int screenState) { 11234 } 11235 11236 /** 11237 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11238 */ 11239 private boolean hasRtlSupport() { 11240 return mContext.getApplicationInfo().hasRtlSupport(); 11241 } 11242 11243 /** 11244 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11245 * that the parent directionality can and will be resolved before its children. 11246 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11247 */ 11248 public void resolveLayoutDirection() { 11249 // Clear any previous layout direction resolution 11250 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11251 11252 if (hasRtlSupport()) { 11253 // Set resolved depending on layout direction 11254 switch (getLayoutDirection()) { 11255 case LAYOUT_DIRECTION_INHERIT: 11256 // We cannot resolve yet. LTR is by default and let the resolution happen again 11257 // later to get the correct resolved value 11258 if (!canResolveLayoutDirection()) return; 11259 11260 ViewGroup viewGroup = ((ViewGroup) mParent); 11261 11262 // We cannot resolve yet on the parent too. LTR is by default and let the 11263 // resolution happen again later 11264 if (!viewGroup.canResolveLayoutDirection()) return; 11265 11266 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11267 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11268 } 11269 break; 11270 case LAYOUT_DIRECTION_RTL: 11271 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11272 break; 11273 case LAYOUT_DIRECTION_LOCALE: 11274 if(isLayoutDirectionRtl(Locale.getDefault())) { 11275 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11276 } 11277 break; 11278 default: 11279 // Nothing to do, LTR by default 11280 } 11281 } 11282 11283 // Set to resolved 11284 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11285 onResolvedLayoutDirectionChanged(); 11286 // Resolve padding 11287 resolvePadding(); 11288 } 11289 11290 /** 11291 * Called when layout direction has been resolved. 11292 * 11293 * The default implementation does nothing. 11294 */ 11295 public void onResolvedLayoutDirectionChanged() { 11296 } 11297 11298 /** 11299 * Resolve padding depending on layout direction. 11300 */ 11301 public void resolvePadding() { 11302 // If the user specified the absolute padding (either with android:padding or 11303 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11304 // use the default padding or the padding from the background drawable 11305 // (stored at this point in mPadding*) 11306 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11307 switch (resolvedLayoutDirection) { 11308 case LAYOUT_DIRECTION_RTL: 11309 // Start user padding override Right user padding. Otherwise, if Right user 11310 // padding is not defined, use the default Right padding. If Right user padding 11311 // is defined, just use it. 11312 if (mUserPaddingStart >= 0) { 11313 mUserPaddingRight = mUserPaddingStart; 11314 } else if (mUserPaddingRight < 0) { 11315 mUserPaddingRight = mPaddingRight; 11316 } 11317 if (mUserPaddingEnd >= 0) { 11318 mUserPaddingLeft = mUserPaddingEnd; 11319 } else if (mUserPaddingLeft < 0) { 11320 mUserPaddingLeft = mPaddingLeft; 11321 } 11322 break; 11323 case LAYOUT_DIRECTION_LTR: 11324 default: 11325 // Start user padding override Left user padding. Otherwise, if Left user 11326 // padding is not defined, use the default left padding. If Left user padding 11327 // is defined, just use it. 11328 if (mUserPaddingStart >= 0) { 11329 mUserPaddingLeft = mUserPaddingStart; 11330 } else if (mUserPaddingLeft < 0) { 11331 mUserPaddingLeft = mPaddingLeft; 11332 } 11333 if (mUserPaddingEnd >= 0) { 11334 mUserPaddingRight = mUserPaddingEnd; 11335 } else if (mUserPaddingRight < 0) { 11336 mUserPaddingRight = mPaddingRight; 11337 } 11338 } 11339 11340 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11341 11342 if(isPaddingRelative()) { 11343 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11344 } else { 11345 recomputePadding(); 11346 } 11347 onPaddingChanged(resolvedLayoutDirection); 11348 } 11349 11350 /** 11351 * Resolve padding depending on the layout direction. Subclasses that care about 11352 * padding resolution should override this method. The default implementation does 11353 * nothing. 11354 * 11355 * @param layoutDirection the direction of the layout 11356 * 11357 * @see {@link #LAYOUT_DIRECTION_LTR} 11358 * @see {@link #LAYOUT_DIRECTION_RTL} 11359 */ 11360 public void onPaddingChanged(int layoutDirection) { 11361 } 11362 11363 /** 11364 * Check if layout direction resolution can be done. 11365 * 11366 * @return true if layout direction resolution can be done otherwise return false. 11367 */ 11368 public boolean canResolveLayoutDirection() { 11369 switch (getLayoutDirection()) { 11370 case LAYOUT_DIRECTION_INHERIT: 11371 return (mParent != null) && (mParent instanceof ViewGroup); 11372 default: 11373 return true; 11374 } 11375 } 11376 11377 /** 11378 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11379 * when reset is done. 11380 */ 11381 public void resetResolvedLayoutDirection() { 11382 // Reset the current resolved bits 11383 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11384 onResolvedLayoutDirectionReset(); 11385 // Reset also the text direction 11386 resetResolvedTextDirection(); 11387 } 11388 11389 /** 11390 * Called during reset of resolved layout direction. 11391 * 11392 * Subclasses need to override this method to clear cached information that depends on the 11393 * resolved layout direction, or to inform child views that inherit their layout direction. 11394 * 11395 * The default implementation does nothing. 11396 */ 11397 public void onResolvedLayoutDirectionReset() { 11398 } 11399 11400 /** 11401 * Check if a Locale uses an RTL script. 11402 * 11403 * @param locale Locale to check 11404 * @return true if the Locale uses an RTL script. 11405 */ 11406 protected static boolean isLayoutDirectionRtl(Locale locale) { 11407 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11408 } 11409 11410 /** 11411 * This is called when the view is detached from a window. At this point it 11412 * no longer has a surface for drawing. 11413 * 11414 * @see #onAttachedToWindow() 11415 */ 11416 protected void onDetachedFromWindow() { 11417 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11418 11419 removeUnsetPressCallback(); 11420 removeLongPressCallback(); 11421 removePerformClickCallback(); 11422 removeSendViewScrolledAccessibilityEventCallback(); 11423 11424 destroyDrawingCache(); 11425 11426 destroyLayer(false); 11427 11428 if (mAttachInfo != null) { 11429 if (mDisplayList != null) { 11430 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11431 } 11432 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11433 } else { 11434 // Should never happen 11435 clearDisplayList(); 11436 } 11437 11438 mCurrentAnimation = null; 11439 11440 resetResolvedLayoutDirection(); 11441 resetResolvedTextAlignment(); 11442 resetAccessibilityStateChanged(); 11443 } 11444 11445 /** 11446 * @return The number of times this view has been attached to a window 11447 */ 11448 protected int getWindowAttachCount() { 11449 return mWindowAttachCount; 11450 } 11451 11452 /** 11453 * Retrieve a unique token identifying the window this view is attached to. 11454 * @return Return the window's token for use in 11455 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11456 */ 11457 public IBinder getWindowToken() { 11458 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11459 } 11460 11461 /** 11462 * Retrieve a unique token identifying the top-level "real" window of 11463 * the window that this view is attached to. That is, this is like 11464 * {@link #getWindowToken}, except if the window this view in is a panel 11465 * window (attached to another containing window), then the token of 11466 * the containing window is returned instead. 11467 * 11468 * @return Returns the associated window token, either 11469 * {@link #getWindowToken()} or the containing window's token. 11470 */ 11471 public IBinder getApplicationWindowToken() { 11472 AttachInfo ai = mAttachInfo; 11473 if (ai != null) { 11474 IBinder appWindowToken = ai.mPanelParentWindowToken; 11475 if (appWindowToken == null) { 11476 appWindowToken = ai.mWindowToken; 11477 } 11478 return appWindowToken; 11479 } 11480 return null; 11481 } 11482 11483 /** 11484 * Retrieve private session object this view hierarchy is using to 11485 * communicate with the window manager. 11486 * @return the session object to communicate with the window manager 11487 */ 11488 /*package*/ IWindowSession getWindowSession() { 11489 return mAttachInfo != null ? mAttachInfo.mSession : null; 11490 } 11491 11492 /** 11493 * @param info the {@link android.view.View.AttachInfo} to associated with 11494 * this view 11495 */ 11496 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11497 //System.out.println("Attached! " + this); 11498 mAttachInfo = info; 11499 mWindowAttachCount++; 11500 // We will need to evaluate the drawable state at least once. 11501 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11502 if (mFloatingTreeObserver != null) { 11503 info.mTreeObserver.merge(mFloatingTreeObserver); 11504 mFloatingTreeObserver = null; 11505 } 11506 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11507 mAttachInfo.mScrollContainers.add(this); 11508 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11509 } 11510 performCollectViewAttributes(mAttachInfo, visibility); 11511 onAttachedToWindow(); 11512 11513 ListenerInfo li = mListenerInfo; 11514 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11515 li != null ? li.mOnAttachStateChangeListeners : null; 11516 if (listeners != null && listeners.size() > 0) { 11517 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11518 // perform the dispatching. The iterator is a safe guard against listeners that 11519 // could mutate the list by calling the various add/remove methods. This prevents 11520 // the array from being modified while we iterate it. 11521 for (OnAttachStateChangeListener listener : listeners) { 11522 listener.onViewAttachedToWindow(this); 11523 } 11524 } 11525 11526 int vis = info.mWindowVisibility; 11527 if (vis != GONE) { 11528 onWindowVisibilityChanged(vis); 11529 } 11530 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11531 // If nobody has evaluated the drawable state yet, then do it now. 11532 refreshDrawableState(); 11533 } 11534 } 11535 11536 void dispatchDetachedFromWindow() { 11537 AttachInfo info = mAttachInfo; 11538 if (info != null) { 11539 int vis = info.mWindowVisibility; 11540 if (vis != GONE) { 11541 onWindowVisibilityChanged(GONE); 11542 } 11543 } 11544 11545 onDetachedFromWindow(); 11546 11547 ListenerInfo li = mListenerInfo; 11548 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11549 li != null ? li.mOnAttachStateChangeListeners : null; 11550 if (listeners != null && listeners.size() > 0) { 11551 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11552 // perform the dispatching. The iterator is a safe guard against listeners that 11553 // could mutate the list by calling the various add/remove methods. This prevents 11554 // the array from being modified while we iterate it. 11555 for (OnAttachStateChangeListener listener : listeners) { 11556 listener.onViewDetachedFromWindow(this); 11557 } 11558 } 11559 11560 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11561 mAttachInfo.mScrollContainers.remove(this); 11562 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11563 } 11564 11565 mAttachInfo = null; 11566 } 11567 11568 /** 11569 * Store this view hierarchy's frozen state into the given container. 11570 * 11571 * @param container The SparseArray in which to save the view's state. 11572 * 11573 * @see #restoreHierarchyState(android.util.SparseArray) 11574 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11575 * @see #onSaveInstanceState() 11576 */ 11577 public void saveHierarchyState(SparseArray<Parcelable> container) { 11578 dispatchSaveInstanceState(container); 11579 } 11580 11581 /** 11582 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11583 * this view and its children. May be overridden to modify how freezing happens to a 11584 * view's children; for example, some views may want to not store state for their children. 11585 * 11586 * @param container The SparseArray in which to save the view's state. 11587 * 11588 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11589 * @see #saveHierarchyState(android.util.SparseArray) 11590 * @see #onSaveInstanceState() 11591 */ 11592 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11593 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11594 mPrivateFlags &= ~SAVE_STATE_CALLED; 11595 Parcelable state = onSaveInstanceState(); 11596 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11597 throw new IllegalStateException( 11598 "Derived class did not call super.onSaveInstanceState()"); 11599 } 11600 if (state != null) { 11601 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11602 // + ": " + state); 11603 container.put(mID, state); 11604 } 11605 } 11606 } 11607 11608 /** 11609 * Hook allowing a view to generate a representation of its internal state 11610 * that can later be used to create a new instance with that same state. 11611 * This state should only contain information that is not persistent or can 11612 * not be reconstructed later. For example, you will never store your 11613 * current position on screen because that will be computed again when a 11614 * new instance of the view is placed in its view hierarchy. 11615 * <p> 11616 * Some examples of things you may store here: the current cursor position 11617 * in a text view (but usually not the text itself since that is stored in a 11618 * content provider or other persistent storage), the currently selected 11619 * item in a list view. 11620 * 11621 * @return Returns a Parcelable object containing the view's current dynamic 11622 * state, or null if there is nothing interesting to save. The 11623 * default implementation returns null. 11624 * @see #onRestoreInstanceState(android.os.Parcelable) 11625 * @see #saveHierarchyState(android.util.SparseArray) 11626 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11627 * @see #setSaveEnabled(boolean) 11628 */ 11629 protected Parcelable onSaveInstanceState() { 11630 mPrivateFlags |= SAVE_STATE_CALLED; 11631 return BaseSavedState.EMPTY_STATE; 11632 } 11633 11634 /** 11635 * Restore this view hierarchy's frozen state from the given container. 11636 * 11637 * @param container The SparseArray which holds previously frozen states. 11638 * 11639 * @see #saveHierarchyState(android.util.SparseArray) 11640 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11641 * @see #onRestoreInstanceState(android.os.Parcelable) 11642 */ 11643 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11644 dispatchRestoreInstanceState(container); 11645 } 11646 11647 /** 11648 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11649 * state for this view and its children. May be overridden to modify how restoring 11650 * happens to a view's children; for example, some views may want to not store state 11651 * for their children. 11652 * 11653 * @param container The SparseArray which holds previously saved state. 11654 * 11655 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11656 * @see #restoreHierarchyState(android.util.SparseArray) 11657 * @see #onRestoreInstanceState(android.os.Parcelable) 11658 */ 11659 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11660 if (mID != NO_ID) { 11661 Parcelable state = container.get(mID); 11662 if (state != null) { 11663 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11664 // + ": " + state); 11665 mPrivateFlags &= ~SAVE_STATE_CALLED; 11666 onRestoreInstanceState(state); 11667 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11668 throw new IllegalStateException( 11669 "Derived class did not call super.onRestoreInstanceState()"); 11670 } 11671 } 11672 } 11673 } 11674 11675 /** 11676 * Hook allowing a view to re-apply a representation of its internal state that had previously 11677 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11678 * null state. 11679 * 11680 * @param state The frozen state that had previously been returned by 11681 * {@link #onSaveInstanceState}. 11682 * 11683 * @see #onSaveInstanceState() 11684 * @see #restoreHierarchyState(android.util.SparseArray) 11685 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11686 */ 11687 protected void onRestoreInstanceState(Parcelable state) { 11688 mPrivateFlags |= SAVE_STATE_CALLED; 11689 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11690 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11691 + "received " + state.getClass().toString() + " instead. This usually happens " 11692 + "when two views of different type have the same id in the same hierarchy. " 11693 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11694 + "other views do not use the same id."); 11695 } 11696 } 11697 11698 /** 11699 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11700 * 11701 * @return the drawing start time in milliseconds 11702 */ 11703 public long getDrawingTime() { 11704 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11705 } 11706 11707 /** 11708 * <p>Enables or disables the duplication of the parent's state into this view. When 11709 * duplication is enabled, this view gets its drawable state from its parent rather 11710 * than from its own internal properties.</p> 11711 * 11712 * <p>Note: in the current implementation, setting this property to true after the 11713 * view was added to a ViewGroup might have no effect at all. This property should 11714 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11715 * 11716 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11717 * property is enabled, an exception will be thrown.</p> 11718 * 11719 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11720 * parent, these states should not be affected by this method.</p> 11721 * 11722 * @param enabled True to enable duplication of the parent's drawable state, false 11723 * to disable it. 11724 * 11725 * @see #getDrawableState() 11726 * @see #isDuplicateParentStateEnabled() 11727 */ 11728 public void setDuplicateParentStateEnabled(boolean enabled) { 11729 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11730 } 11731 11732 /** 11733 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11734 * 11735 * @return True if this view's drawable state is duplicated from the parent, 11736 * false otherwise 11737 * 11738 * @see #getDrawableState() 11739 * @see #setDuplicateParentStateEnabled(boolean) 11740 */ 11741 public boolean isDuplicateParentStateEnabled() { 11742 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11743 } 11744 11745 /** 11746 * <p>Specifies the type of layer backing this view. The layer can be 11747 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11748 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11749 * 11750 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11751 * instance that controls how the layer is composed on screen. The following 11752 * properties of the paint are taken into account when composing the layer:</p> 11753 * <ul> 11754 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11755 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11756 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11757 * </ul> 11758 * 11759 * <p>If this view has an alpha value set to < 1.0 by calling 11760 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11761 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11762 * equivalent to setting a hardware layer on this view and providing a paint with 11763 * the desired alpha value.<p> 11764 * 11765 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11766 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11767 * for more information on when and how to use layers.</p> 11768 * 11769 * @param layerType The ype of layer to use with this view, must be one of 11770 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11771 * {@link #LAYER_TYPE_HARDWARE} 11772 * @param paint The paint used to compose the layer. This argument is optional 11773 * and can be null. It is ignored when the layer type is 11774 * {@link #LAYER_TYPE_NONE} 11775 * 11776 * @see #getLayerType() 11777 * @see #LAYER_TYPE_NONE 11778 * @see #LAYER_TYPE_SOFTWARE 11779 * @see #LAYER_TYPE_HARDWARE 11780 * @see #setAlpha(float) 11781 * 11782 * @attr ref android.R.styleable#View_layerType 11783 */ 11784 public void setLayerType(int layerType, Paint paint) { 11785 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11786 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11787 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11788 } 11789 11790 if (layerType == mLayerType) { 11791 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11792 mLayerPaint = paint == null ? new Paint() : paint; 11793 invalidateParentCaches(); 11794 invalidate(true); 11795 } 11796 return; 11797 } 11798 11799 // Destroy any previous software drawing cache if needed 11800 switch (mLayerType) { 11801 case LAYER_TYPE_HARDWARE: 11802 destroyLayer(false); 11803 // fall through - non-accelerated views may use software layer mechanism instead 11804 case LAYER_TYPE_SOFTWARE: 11805 destroyDrawingCache(); 11806 break; 11807 default: 11808 break; 11809 } 11810 11811 mLayerType = layerType; 11812 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11813 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11814 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11815 11816 invalidateParentCaches(); 11817 invalidate(true); 11818 } 11819 11820 /** 11821 * Indicates whether this view has a static layer. A view with layer type 11822 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11823 * dynamic. 11824 */ 11825 boolean hasStaticLayer() { 11826 return true; 11827 } 11828 11829 /** 11830 * Indicates what type of layer is currently associated with this view. By default 11831 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11832 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11833 * for more information on the different types of layers. 11834 * 11835 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11836 * {@link #LAYER_TYPE_HARDWARE} 11837 * 11838 * @see #setLayerType(int, android.graphics.Paint) 11839 * @see #buildLayer() 11840 * @see #LAYER_TYPE_NONE 11841 * @see #LAYER_TYPE_SOFTWARE 11842 * @see #LAYER_TYPE_HARDWARE 11843 */ 11844 public int getLayerType() { 11845 return mLayerType; 11846 } 11847 11848 /** 11849 * Forces this view's layer to be created and this view to be rendered 11850 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11851 * invoking this method will have no effect. 11852 * 11853 * This method can for instance be used to render a view into its layer before 11854 * starting an animation. If this view is complex, rendering into the layer 11855 * before starting the animation will avoid skipping frames. 11856 * 11857 * @throws IllegalStateException If this view is not attached to a window 11858 * 11859 * @see #setLayerType(int, android.graphics.Paint) 11860 */ 11861 public void buildLayer() { 11862 if (mLayerType == LAYER_TYPE_NONE) return; 11863 11864 if (mAttachInfo == null) { 11865 throw new IllegalStateException("This view must be attached to a window first"); 11866 } 11867 11868 switch (mLayerType) { 11869 case LAYER_TYPE_HARDWARE: 11870 if (mAttachInfo.mHardwareRenderer != null && 11871 mAttachInfo.mHardwareRenderer.isEnabled() && 11872 mAttachInfo.mHardwareRenderer.validate()) { 11873 getHardwareLayer(); 11874 } 11875 break; 11876 case LAYER_TYPE_SOFTWARE: 11877 buildDrawingCache(true); 11878 break; 11879 } 11880 } 11881 11882 /** 11883 * <p>Returns a hardware layer that can be used to draw this view again 11884 * without executing its draw method.</p> 11885 * 11886 * @return A HardwareLayer ready to render, or null if an error occurred. 11887 */ 11888 HardwareLayer getHardwareLayer() { 11889 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11890 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11891 return null; 11892 } 11893 11894 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11895 11896 final int width = mRight - mLeft; 11897 final int height = mBottom - mTop; 11898 11899 if (width == 0 || height == 0) { 11900 return null; 11901 } 11902 11903 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11904 if (mHardwareLayer == null) { 11905 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11906 width, height, isOpaque()); 11907 mLocalDirtyRect.set(0, 0, width, height); 11908 } else { 11909 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11910 mHardwareLayer.resize(width, height); 11911 mLocalDirtyRect.set(0, 0, width, height); 11912 } 11913 11914 // This should not be necessary but applications that change 11915 // the parameters of their background drawable without calling 11916 // this.setBackground(Drawable) can leave the view in a bad state 11917 // (for instance isOpaque() returns true, but the background is 11918 // not opaque.) 11919 computeOpaqueFlags(); 11920 11921 final boolean opaque = isOpaque(); 11922 if (mHardwareLayer.isOpaque() != opaque) { 11923 mHardwareLayer.setOpaque(opaque); 11924 mLocalDirtyRect.set(0, 0, width, height); 11925 } 11926 } 11927 11928 // The layer is not valid if the underlying GPU resources cannot be allocated 11929 if (!mHardwareLayer.isValid()) { 11930 return null; 11931 } 11932 11933 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11934 mLocalDirtyRect.setEmpty(); 11935 } 11936 11937 return mHardwareLayer; 11938 } 11939 11940 /** 11941 * Destroys this View's hardware layer if possible. 11942 * 11943 * @return True if the layer was destroyed, false otherwise. 11944 * 11945 * @see #setLayerType(int, android.graphics.Paint) 11946 * @see #LAYER_TYPE_HARDWARE 11947 */ 11948 boolean destroyLayer(boolean valid) { 11949 if (mHardwareLayer != null) { 11950 AttachInfo info = mAttachInfo; 11951 if (info != null && info.mHardwareRenderer != null && 11952 info.mHardwareRenderer.isEnabled() && 11953 (valid || info.mHardwareRenderer.validate())) { 11954 mHardwareLayer.destroy(); 11955 mHardwareLayer = null; 11956 11957 invalidate(true); 11958 invalidateParentCaches(); 11959 } 11960 return true; 11961 } 11962 return false; 11963 } 11964 11965 /** 11966 * Destroys all hardware rendering resources. This method is invoked 11967 * when the system needs to reclaim resources. Upon execution of this 11968 * method, you should free any OpenGL resources created by the view. 11969 * 11970 * Note: you <strong>must</strong> call 11971 * <code>super.destroyHardwareResources()</code> when overriding 11972 * this method. 11973 * 11974 * @hide 11975 */ 11976 protected void destroyHardwareResources() { 11977 destroyLayer(true); 11978 } 11979 11980 /** 11981 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11982 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11983 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11984 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11985 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11986 * null.</p> 11987 * 11988 * <p>Enabling the drawing cache is similar to 11989 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11990 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11991 * drawing cache has no effect on rendering because the system uses a different mechanism 11992 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11993 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11994 * for information on how to enable software and hardware layers.</p> 11995 * 11996 * <p>This API can be used to manually generate 11997 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11998 * {@link #getDrawingCache()}.</p> 11999 * 12000 * @param enabled true to enable the drawing cache, false otherwise 12001 * 12002 * @see #isDrawingCacheEnabled() 12003 * @see #getDrawingCache() 12004 * @see #buildDrawingCache() 12005 * @see #setLayerType(int, android.graphics.Paint) 12006 */ 12007 public void setDrawingCacheEnabled(boolean enabled) { 12008 mCachingFailed = false; 12009 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12010 } 12011 12012 /** 12013 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12014 * 12015 * @return true if the drawing cache is enabled 12016 * 12017 * @see #setDrawingCacheEnabled(boolean) 12018 * @see #getDrawingCache() 12019 */ 12020 @ViewDebug.ExportedProperty(category = "drawing") 12021 public boolean isDrawingCacheEnabled() { 12022 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12023 } 12024 12025 /** 12026 * Debugging utility which recursively outputs the dirty state of a view and its 12027 * descendants. 12028 * 12029 * @hide 12030 */ 12031 @SuppressWarnings({"UnusedDeclaration"}) 12032 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12033 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12034 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12035 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12036 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12037 if (clear) { 12038 mPrivateFlags &= clearMask; 12039 } 12040 if (this instanceof ViewGroup) { 12041 ViewGroup parent = (ViewGroup) this; 12042 final int count = parent.getChildCount(); 12043 for (int i = 0; i < count; i++) { 12044 final View child = parent.getChildAt(i); 12045 child.outputDirtyFlags(indent + " ", clear, clearMask); 12046 } 12047 } 12048 } 12049 12050 /** 12051 * This method is used by ViewGroup to cause its children to restore or recreate their 12052 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12053 * to recreate its own display list, which would happen if it went through the normal 12054 * draw/dispatchDraw mechanisms. 12055 * 12056 * @hide 12057 */ 12058 protected void dispatchGetDisplayList() {} 12059 12060 /** 12061 * A view that is not attached or hardware accelerated cannot create a display list. 12062 * This method checks these conditions and returns the appropriate result. 12063 * 12064 * @return true if view has the ability to create a display list, false otherwise. 12065 * 12066 * @hide 12067 */ 12068 public boolean canHaveDisplayList() { 12069 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12070 } 12071 12072 /** 12073 * @return The HardwareRenderer associated with that view or null if hardware rendering 12074 * is not supported or this this has not been attached to a window. 12075 * 12076 * @hide 12077 */ 12078 public HardwareRenderer getHardwareRenderer() { 12079 if (mAttachInfo != null) { 12080 return mAttachInfo.mHardwareRenderer; 12081 } 12082 return null; 12083 } 12084 12085 /** 12086 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12087 * Otherwise, the same display list will be returned (after having been rendered into 12088 * along the way, depending on the invalidation state of the view). 12089 * 12090 * @param displayList The previous version of this displayList, could be null. 12091 * @param isLayer Whether the requester of the display list is a layer. If so, 12092 * the view will avoid creating a layer inside the resulting display list. 12093 * @return A new or reused DisplayList object. 12094 */ 12095 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12096 if (!canHaveDisplayList()) { 12097 return null; 12098 } 12099 12100 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12101 displayList == null || !displayList.isValid() || 12102 (!isLayer && mRecreateDisplayList))) { 12103 // Don't need to recreate the display list, just need to tell our 12104 // children to restore/recreate theirs 12105 if (displayList != null && displayList.isValid() && 12106 !isLayer && !mRecreateDisplayList) { 12107 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12108 mPrivateFlags &= ~DIRTY_MASK; 12109 dispatchGetDisplayList(); 12110 12111 return displayList; 12112 } 12113 12114 if (!isLayer) { 12115 // If we got here, we're recreating it. Mark it as such to ensure that 12116 // we copy in child display lists into ours in drawChild() 12117 mRecreateDisplayList = true; 12118 } 12119 if (displayList == null) { 12120 final String name = getClass().getSimpleName(); 12121 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12122 // If we're creating a new display list, make sure our parent gets invalidated 12123 // since they will need to recreate their display list to account for this 12124 // new child display list. 12125 invalidateParentCaches(); 12126 } 12127 12128 boolean caching = false; 12129 final HardwareCanvas canvas = displayList.start(); 12130 int width = mRight - mLeft; 12131 int height = mBottom - mTop; 12132 12133 try { 12134 canvas.setViewport(width, height); 12135 // The dirty rect should always be null for a display list 12136 canvas.onPreDraw(null); 12137 int layerType = getLayerType(); 12138 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12139 if (layerType == LAYER_TYPE_HARDWARE) { 12140 final HardwareLayer layer = getHardwareLayer(); 12141 if (layer != null && layer.isValid()) { 12142 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12143 } else { 12144 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12145 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12146 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12147 } 12148 caching = true; 12149 } else { 12150 buildDrawingCache(true); 12151 Bitmap cache = getDrawingCache(true); 12152 if (cache != null) { 12153 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12154 caching = true; 12155 } 12156 } 12157 } else { 12158 12159 computeScroll(); 12160 12161 canvas.translate(-mScrollX, -mScrollY); 12162 if (!isLayer) { 12163 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12164 mPrivateFlags &= ~DIRTY_MASK; 12165 } 12166 12167 // Fast path for layouts with no backgrounds 12168 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12169 dispatchDraw(canvas); 12170 } else { 12171 draw(canvas); 12172 } 12173 } 12174 } finally { 12175 canvas.onPostDraw(); 12176 12177 displayList.end(); 12178 displayList.setCaching(caching); 12179 if (isLayer) { 12180 displayList.setLeftTopRightBottom(0, 0, width, height); 12181 } else { 12182 setDisplayListProperties(displayList); 12183 } 12184 } 12185 } else if (!isLayer) { 12186 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12187 mPrivateFlags &= ~DIRTY_MASK; 12188 } 12189 12190 return displayList; 12191 } 12192 12193 /** 12194 * Get the DisplayList for the HardwareLayer 12195 * 12196 * @param layer The HardwareLayer whose DisplayList we want 12197 * @return A DisplayList fopr the specified HardwareLayer 12198 */ 12199 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12200 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12201 layer.setDisplayList(displayList); 12202 return displayList; 12203 } 12204 12205 12206 /** 12207 * <p>Returns a display list that can be used to draw this view again 12208 * without executing its draw method.</p> 12209 * 12210 * @return A DisplayList ready to replay, or null if caching is not enabled. 12211 * 12212 * @hide 12213 */ 12214 public DisplayList getDisplayList() { 12215 mDisplayList = getDisplayList(mDisplayList, false); 12216 return mDisplayList; 12217 } 12218 12219 private void clearDisplayList() { 12220 if (mDisplayList != null) { 12221 mDisplayList.invalidate(); 12222 mDisplayList.clear(); 12223 } 12224 } 12225 12226 /** 12227 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12228 * 12229 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12230 * 12231 * @see #getDrawingCache(boolean) 12232 */ 12233 public Bitmap getDrawingCache() { 12234 return getDrawingCache(false); 12235 } 12236 12237 /** 12238 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12239 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12240 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12241 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12242 * request the drawing cache by calling this method and draw it on screen if the 12243 * returned bitmap is not null.</p> 12244 * 12245 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12246 * this method will create a bitmap of the same size as this view. Because this bitmap 12247 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12248 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12249 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12250 * size than the view. This implies that your application must be able to handle this 12251 * size.</p> 12252 * 12253 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12254 * the current density of the screen when the application is in compatibility 12255 * mode. 12256 * 12257 * @return A bitmap representing this view or null if cache is disabled. 12258 * 12259 * @see #setDrawingCacheEnabled(boolean) 12260 * @see #isDrawingCacheEnabled() 12261 * @see #buildDrawingCache(boolean) 12262 * @see #destroyDrawingCache() 12263 */ 12264 public Bitmap getDrawingCache(boolean autoScale) { 12265 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12266 return null; 12267 } 12268 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12269 buildDrawingCache(autoScale); 12270 } 12271 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12272 } 12273 12274 /** 12275 * <p>Frees the resources used by the drawing cache. If you call 12276 * {@link #buildDrawingCache()} manually without calling 12277 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12278 * should cleanup the cache with this method afterwards.</p> 12279 * 12280 * @see #setDrawingCacheEnabled(boolean) 12281 * @see #buildDrawingCache() 12282 * @see #getDrawingCache() 12283 */ 12284 public void destroyDrawingCache() { 12285 if (mDrawingCache != null) { 12286 mDrawingCache.recycle(); 12287 mDrawingCache = null; 12288 } 12289 if (mUnscaledDrawingCache != null) { 12290 mUnscaledDrawingCache.recycle(); 12291 mUnscaledDrawingCache = null; 12292 } 12293 } 12294 12295 /** 12296 * Setting a solid background color for the drawing cache's bitmaps will improve 12297 * performance and memory usage. Note, though that this should only be used if this 12298 * view will always be drawn on top of a solid color. 12299 * 12300 * @param color The background color to use for the drawing cache's bitmap 12301 * 12302 * @see #setDrawingCacheEnabled(boolean) 12303 * @see #buildDrawingCache() 12304 * @see #getDrawingCache() 12305 */ 12306 public void setDrawingCacheBackgroundColor(int color) { 12307 if (color != mDrawingCacheBackgroundColor) { 12308 mDrawingCacheBackgroundColor = color; 12309 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12310 } 12311 } 12312 12313 /** 12314 * @see #setDrawingCacheBackgroundColor(int) 12315 * 12316 * @return The background color to used for the drawing cache's bitmap 12317 */ 12318 public int getDrawingCacheBackgroundColor() { 12319 return mDrawingCacheBackgroundColor; 12320 } 12321 12322 /** 12323 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12324 * 12325 * @see #buildDrawingCache(boolean) 12326 */ 12327 public void buildDrawingCache() { 12328 buildDrawingCache(false); 12329 } 12330 12331 /** 12332 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12333 * 12334 * <p>If you call {@link #buildDrawingCache()} manually without calling 12335 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12336 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12337 * 12338 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12339 * this method will create a bitmap of the same size as this view. Because this bitmap 12340 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12341 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12342 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12343 * size than the view. This implies that your application must be able to handle this 12344 * size.</p> 12345 * 12346 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12347 * you do not need the drawing cache bitmap, calling this method will increase memory 12348 * usage and cause the view to be rendered in software once, thus negatively impacting 12349 * performance.</p> 12350 * 12351 * @see #getDrawingCache() 12352 * @see #destroyDrawingCache() 12353 */ 12354 public void buildDrawingCache(boolean autoScale) { 12355 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12356 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12357 mCachingFailed = false; 12358 12359 int width = mRight - mLeft; 12360 int height = mBottom - mTop; 12361 12362 final AttachInfo attachInfo = mAttachInfo; 12363 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12364 12365 if (autoScale && scalingRequired) { 12366 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12367 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12368 } 12369 12370 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12371 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12372 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12373 12374 if (width <= 0 || height <= 0 || 12375 // Projected bitmap size in bytes 12376 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12377 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12378 destroyDrawingCache(); 12379 mCachingFailed = true; 12380 return; 12381 } 12382 12383 boolean clear = true; 12384 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12385 12386 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12387 Bitmap.Config quality; 12388 if (!opaque) { 12389 // Never pick ARGB_4444 because it looks awful 12390 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12391 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12392 case DRAWING_CACHE_QUALITY_AUTO: 12393 quality = Bitmap.Config.ARGB_8888; 12394 break; 12395 case DRAWING_CACHE_QUALITY_LOW: 12396 quality = Bitmap.Config.ARGB_8888; 12397 break; 12398 case DRAWING_CACHE_QUALITY_HIGH: 12399 quality = Bitmap.Config.ARGB_8888; 12400 break; 12401 default: 12402 quality = Bitmap.Config.ARGB_8888; 12403 break; 12404 } 12405 } else { 12406 // Optimization for translucent windows 12407 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12408 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12409 } 12410 12411 // Try to cleanup memory 12412 if (bitmap != null) bitmap.recycle(); 12413 12414 try { 12415 bitmap = Bitmap.createBitmap(width, height, quality); 12416 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12417 if (autoScale) { 12418 mDrawingCache = bitmap; 12419 } else { 12420 mUnscaledDrawingCache = bitmap; 12421 } 12422 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12423 } catch (OutOfMemoryError e) { 12424 // If there is not enough memory to create the bitmap cache, just 12425 // ignore the issue as bitmap caches are not required to draw the 12426 // view hierarchy 12427 if (autoScale) { 12428 mDrawingCache = null; 12429 } else { 12430 mUnscaledDrawingCache = null; 12431 } 12432 mCachingFailed = true; 12433 return; 12434 } 12435 12436 clear = drawingCacheBackgroundColor != 0; 12437 } 12438 12439 Canvas canvas; 12440 if (attachInfo != null) { 12441 canvas = attachInfo.mCanvas; 12442 if (canvas == null) { 12443 canvas = new Canvas(); 12444 } 12445 canvas.setBitmap(bitmap); 12446 // Temporarily clobber the cached Canvas in case one of our children 12447 // is also using a drawing cache. Without this, the children would 12448 // steal the canvas by attaching their own bitmap to it and bad, bad 12449 // thing would happen (invisible views, corrupted drawings, etc.) 12450 attachInfo.mCanvas = null; 12451 } else { 12452 // This case should hopefully never or seldom happen 12453 canvas = new Canvas(bitmap); 12454 } 12455 12456 if (clear) { 12457 bitmap.eraseColor(drawingCacheBackgroundColor); 12458 } 12459 12460 computeScroll(); 12461 final int restoreCount = canvas.save(); 12462 12463 if (autoScale && scalingRequired) { 12464 final float scale = attachInfo.mApplicationScale; 12465 canvas.scale(scale, scale); 12466 } 12467 12468 canvas.translate(-mScrollX, -mScrollY); 12469 12470 mPrivateFlags |= DRAWN; 12471 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12472 mLayerType != LAYER_TYPE_NONE) { 12473 mPrivateFlags |= DRAWING_CACHE_VALID; 12474 } 12475 12476 // Fast path for layouts with no backgrounds 12477 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12478 mPrivateFlags &= ~DIRTY_MASK; 12479 dispatchDraw(canvas); 12480 } else { 12481 draw(canvas); 12482 } 12483 12484 canvas.restoreToCount(restoreCount); 12485 canvas.setBitmap(null); 12486 12487 if (attachInfo != null) { 12488 // Restore the cached Canvas for our siblings 12489 attachInfo.mCanvas = canvas; 12490 } 12491 } 12492 } 12493 12494 /** 12495 * Create a snapshot of the view into a bitmap. We should probably make 12496 * some form of this public, but should think about the API. 12497 */ 12498 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12499 int width = mRight - mLeft; 12500 int height = mBottom - mTop; 12501 12502 final AttachInfo attachInfo = mAttachInfo; 12503 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12504 width = (int) ((width * scale) + 0.5f); 12505 height = (int) ((height * scale) + 0.5f); 12506 12507 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12508 if (bitmap == null) { 12509 throw new OutOfMemoryError(); 12510 } 12511 12512 Resources resources = getResources(); 12513 if (resources != null) { 12514 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12515 } 12516 12517 Canvas canvas; 12518 if (attachInfo != null) { 12519 canvas = attachInfo.mCanvas; 12520 if (canvas == null) { 12521 canvas = new Canvas(); 12522 } 12523 canvas.setBitmap(bitmap); 12524 // Temporarily clobber the cached Canvas in case one of our children 12525 // is also using a drawing cache. Without this, the children would 12526 // steal the canvas by attaching their own bitmap to it and bad, bad 12527 // things would happen (invisible views, corrupted drawings, etc.) 12528 attachInfo.mCanvas = null; 12529 } else { 12530 // This case should hopefully never or seldom happen 12531 canvas = new Canvas(bitmap); 12532 } 12533 12534 if ((backgroundColor & 0xff000000) != 0) { 12535 bitmap.eraseColor(backgroundColor); 12536 } 12537 12538 computeScroll(); 12539 final int restoreCount = canvas.save(); 12540 canvas.scale(scale, scale); 12541 canvas.translate(-mScrollX, -mScrollY); 12542 12543 // Temporarily remove the dirty mask 12544 int flags = mPrivateFlags; 12545 mPrivateFlags &= ~DIRTY_MASK; 12546 12547 // Fast path for layouts with no backgrounds 12548 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12549 dispatchDraw(canvas); 12550 } else { 12551 draw(canvas); 12552 } 12553 12554 mPrivateFlags = flags; 12555 12556 canvas.restoreToCount(restoreCount); 12557 canvas.setBitmap(null); 12558 12559 if (attachInfo != null) { 12560 // Restore the cached Canvas for our siblings 12561 attachInfo.mCanvas = canvas; 12562 } 12563 12564 return bitmap; 12565 } 12566 12567 /** 12568 * Indicates whether this View is currently in edit mode. A View is usually 12569 * in edit mode when displayed within a developer tool. For instance, if 12570 * this View is being drawn by a visual user interface builder, this method 12571 * should return true. 12572 * 12573 * Subclasses should check the return value of this method to provide 12574 * different behaviors if their normal behavior might interfere with the 12575 * host environment. For instance: the class spawns a thread in its 12576 * constructor, the drawing code relies on device-specific features, etc. 12577 * 12578 * This method is usually checked in the drawing code of custom widgets. 12579 * 12580 * @return True if this View is in edit mode, false otherwise. 12581 */ 12582 public boolean isInEditMode() { 12583 return false; 12584 } 12585 12586 /** 12587 * If the View draws content inside its padding and enables fading edges, 12588 * it needs to support padding offsets. Padding offsets are added to the 12589 * fading edges to extend the length of the fade so that it covers pixels 12590 * drawn inside the padding. 12591 * 12592 * Subclasses of this class should override this method if they need 12593 * to draw content inside the padding. 12594 * 12595 * @return True if padding offset must be applied, false otherwise. 12596 * 12597 * @see #getLeftPaddingOffset() 12598 * @see #getRightPaddingOffset() 12599 * @see #getTopPaddingOffset() 12600 * @see #getBottomPaddingOffset() 12601 * 12602 * @since CURRENT 12603 */ 12604 protected boolean isPaddingOffsetRequired() { 12605 return false; 12606 } 12607 12608 /** 12609 * Amount by which to extend the left fading region. Called only when 12610 * {@link #isPaddingOffsetRequired()} returns true. 12611 * 12612 * @return The left padding offset in pixels. 12613 * 12614 * @see #isPaddingOffsetRequired() 12615 * 12616 * @since CURRENT 12617 */ 12618 protected int getLeftPaddingOffset() { 12619 return 0; 12620 } 12621 12622 /** 12623 * Amount by which to extend the right fading region. Called only when 12624 * {@link #isPaddingOffsetRequired()} returns true. 12625 * 12626 * @return The right padding offset in pixels. 12627 * 12628 * @see #isPaddingOffsetRequired() 12629 * 12630 * @since CURRENT 12631 */ 12632 protected int getRightPaddingOffset() { 12633 return 0; 12634 } 12635 12636 /** 12637 * Amount by which to extend the top fading region. Called only when 12638 * {@link #isPaddingOffsetRequired()} returns true. 12639 * 12640 * @return The top padding offset in pixels. 12641 * 12642 * @see #isPaddingOffsetRequired() 12643 * 12644 * @since CURRENT 12645 */ 12646 protected int getTopPaddingOffset() { 12647 return 0; 12648 } 12649 12650 /** 12651 * Amount by which to extend the bottom fading region. Called only when 12652 * {@link #isPaddingOffsetRequired()} returns true. 12653 * 12654 * @return The bottom padding offset in pixels. 12655 * 12656 * @see #isPaddingOffsetRequired() 12657 * 12658 * @since CURRENT 12659 */ 12660 protected int getBottomPaddingOffset() { 12661 return 0; 12662 } 12663 12664 /** 12665 * @hide 12666 * @param offsetRequired 12667 */ 12668 protected int getFadeTop(boolean offsetRequired) { 12669 int top = mPaddingTop; 12670 if (offsetRequired) top += getTopPaddingOffset(); 12671 return top; 12672 } 12673 12674 /** 12675 * @hide 12676 * @param offsetRequired 12677 */ 12678 protected int getFadeHeight(boolean offsetRequired) { 12679 int padding = mPaddingTop; 12680 if (offsetRequired) padding += getTopPaddingOffset(); 12681 return mBottom - mTop - mPaddingBottom - padding; 12682 } 12683 12684 /** 12685 * <p>Indicates whether this view is attached to a hardware accelerated 12686 * window or not.</p> 12687 * 12688 * <p>Even if this method returns true, it does not mean that every call 12689 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12690 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12691 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12692 * window is hardware accelerated, 12693 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12694 * return false, and this method will return true.</p> 12695 * 12696 * @return True if the view is attached to a window and the window is 12697 * hardware accelerated; false in any other case. 12698 */ 12699 public boolean isHardwareAccelerated() { 12700 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12701 } 12702 12703 /** 12704 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12705 * case of an active Animation being run on the view. 12706 */ 12707 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12708 Animation a, boolean scalingRequired) { 12709 Transformation invalidationTransform; 12710 final int flags = parent.mGroupFlags; 12711 final boolean initialized = a.isInitialized(); 12712 if (!initialized) { 12713 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12714 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12715 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 12716 onAnimationStart(); 12717 } 12718 12719 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12720 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12721 if (parent.mInvalidationTransformation == null) { 12722 parent.mInvalidationTransformation = new Transformation(); 12723 } 12724 invalidationTransform = parent.mInvalidationTransformation; 12725 a.getTransformation(drawingTime, invalidationTransform, 1f); 12726 } else { 12727 invalidationTransform = parent.mChildTransformation; 12728 } 12729 12730 if (more) { 12731 if (!a.willChangeBounds()) { 12732 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 12733 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 12734 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 12735 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 12736 // The child need to draw an animation, potentially offscreen, so 12737 // make sure we do not cancel invalidate requests 12738 parent.mPrivateFlags |= DRAW_ANIMATION; 12739 parent.invalidate(mLeft, mTop, mRight, mBottom); 12740 } 12741 } else { 12742 if (parent.mInvalidateRegion == null) { 12743 parent.mInvalidateRegion = new RectF(); 12744 } 12745 final RectF region = parent.mInvalidateRegion; 12746 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12747 invalidationTransform); 12748 12749 // The child need to draw an animation, potentially offscreen, so 12750 // make sure we do not cancel invalidate requests 12751 parent.mPrivateFlags |= DRAW_ANIMATION; 12752 12753 final int left = mLeft + (int) region.left; 12754 final int top = mTop + (int) region.top; 12755 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12756 top + (int) (region.height() + .5f)); 12757 } 12758 } 12759 return more; 12760 } 12761 12762 /** 12763 * This method is called by getDisplayList() when a display list is created or re-rendered. 12764 * It sets or resets the current value of all properties on that display list (resetting is 12765 * necessary when a display list is being re-created, because we need to make sure that 12766 * previously-set transform values 12767 */ 12768 void setDisplayListProperties(DisplayList displayList) { 12769 if (displayList != null) { 12770 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12771 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12772 if (mParent instanceof ViewGroup) { 12773 displayList.setClipChildren( 12774 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12775 } 12776 float alpha = 1; 12777 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12778 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12779 ViewGroup parentVG = (ViewGroup) mParent; 12780 final boolean hasTransform = 12781 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12782 if (hasTransform) { 12783 Transformation transform = parentVG.mChildTransformation; 12784 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12785 if (transformType != Transformation.TYPE_IDENTITY) { 12786 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12787 alpha = transform.getAlpha(); 12788 } 12789 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12790 displayList.setStaticMatrix(transform.getMatrix()); 12791 } 12792 } 12793 } 12794 } 12795 if (mTransformationInfo != null) { 12796 alpha *= mTransformationInfo.mAlpha; 12797 if (alpha < 1) { 12798 final int multipliedAlpha = (int) (255 * alpha); 12799 if (onSetAlpha(multipliedAlpha)) { 12800 alpha = 1; 12801 } 12802 } 12803 displayList.setTransformationInfo(alpha, 12804 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12805 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12806 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12807 mTransformationInfo.mScaleY); 12808 if (mTransformationInfo.mCamera == null) { 12809 mTransformationInfo.mCamera = new Camera(); 12810 mTransformationInfo.matrix3D = new Matrix(); 12811 } 12812 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12813 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12814 displayList.setPivotX(getPivotX()); 12815 displayList.setPivotY(getPivotY()); 12816 } 12817 } else if (alpha < 1) { 12818 displayList.setAlpha(alpha); 12819 } 12820 } 12821 } 12822 12823 /** 12824 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12825 * This draw() method is an implementation detail and is not intended to be overridden or 12826 * to be called from anywhere else other than ViewGroup.drawChild(). 12827 */ 12828 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12829 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12830 boolean more = false; 12831 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12832 final int flags = parent.mGroupFlags; 12833 12834 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12835 parent.mChildTransformation.clear(); 12836 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12837 } 12838 12839 Transformation transformToApply = null; 12840 boolean concatMatrix = false; 12841 12842 boolean scalingRequired = false; 12843 boolean caching; 12844 int layerType = getLayerType(); 12845 12846 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12847 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12848 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12849 caching = true; 12850 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12851 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12852 } else { 12853 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12854 } 12855 12856 final Animation a = getAnimation(); 12857 if (a != null) { 12858 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12859 concatMatrix = a.willChangeTransformationMatrix(); 12860 if (concatMatrix) { 12861 mPrivateFlags3 |= VIEW_IS_ANIMATING_TRANSFORM; 12862 } 12863 transformToApply = parent.mChildTransformation; 12864 } else { 12865 if ((mPrivateFlags3 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12866 mDisplayList != null) { 12867 // No longer animating: clear out old animation matrix 12868 mDisplayList.setAnimationMatrix(null); 12869 mPrivateFlags3 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12870 } 12871 if (!useDisplayListProperties && 12872 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12873 final boolean hasTransform = 12874 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12875 if (hasTransform) { 12876 final int transformType = parent.mChildTransformation.getTransformationType(); 12877 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12878 parent.mChildTransformation : null; 12879 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12880 } 12881 } 12882 } 12883 12884 concatMatrix |= !childHasIdentityMatrix; 12885 12886 // Sets the flag as early as possible to allow draw() implementations 12887 // to call invalidate() successfully when doing animations 12888 mPrivateFlags |= DRAWN; 12889 12890 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12891 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12892 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12893 return more; 12894 } 12895 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12896 12897 if (hardwareAccelerated) { 12898 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12899 // retain the flag's value temporarily in the mRecreateDisplayList flag 12900 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12901 mPrivateFlags &= ~INVALIDATED; 12902 } 12903 12904 DisplayList displayList = null; 12905 Bitmap cache = null; 12906 boolean hasDisplayList = false; 12907 if (caching) { 12908 if (!hardwareAccelerated) { 12909 if (layerType != LAYER_TYPE_NONE) { 12910 layerType = LAYER_TYPE_SOFTWARE; 12911 buildDrawingCache(true); 12912 } 12913 cache = getDrawingCache(true); 12914 } else { 12915 switch (layerType) { 12916 case LAYER_TYPE_SOFTWARE: 12917 if (useDisplayListProperties) { 12918 hasDisplayList = canHaveDisplayList(); 12919 } else { 12920 buildDrawingCache(true); 12921 cache = getDrawingCache(true); 12922 } 12923 break; 12924 case LAYER_TYPE_HARDWARE: 12925 if (useDisplayListProperties) { 12926 hasDisplayList = canHaveDisplayList(); 12927 } 12928 break; 12929 case LAYER_TYPE_NONE: 12930 // Delay getting the display list until animation-driven alpha values are 12931 // set up and possibly passed on to the view 12932 hasDisplayList = canHaveDisplayList(); 12933 break; 12934 } 12935 } 12936 } 12937 useDisplayListProperties &= hasDisplayList; 12938 if (useDisplayListProperties) { 12939 displayList = getDisplayList(); 12940 if (!displayList.isValid()) { 12941 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12942 // to getDisplayList(), the display list will be marked invalid and we should not 12943 // try to use it again. 12944 displayList = null; 12945 hasDisplayList = false; 12946 useDisplayListProperties = false; 12947 } 12948 } 12949 12950 int sx = 0; 12951 int sy = 0; 12952 if (!hasDisplayList) { 12953 computeScroll(); 12954 sx = mScrollX; 12955 sy = mScrollY; 12956 } 12957 12958 final boolean hasNoCache = cache == null || hasDisplayList; 12959 final boolean offsetForScroll = cache == null && !hasDisplayList && 12960 layerType != LAYER_TYPE_HARDWARE; 12961 12962 int restoreTo = -1; 12963 if (!useDisplayListProperties || transformToApply != null) { 12964 restoreTo = canvas.save(); 12965 } 12966 if (offsetForScroll) { 12967 canvas.translate(mLeft - sx, mTop - sy); 12968 } else { 12969 if (!useDisplayListProperties) { 12970 canvas.translate(mLeft, mTop); 12971 } 12972 if (scalingRequired) { 12973 if (useDisplayListProperties) { 12974 // TODO: Might not need this if we put everything inside the DL 12975 restoreTo = canvas.save(); 12976 } 12977 // mAttachInfo cannot be null, otherwise scalingRequired == false 12978 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12979 canvas.scale(scale, scale); 12980 } 12981 } 12982 12983 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12984 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 12985 (mPrivateFlags3 & VIEW_IS_ANIMATING_ALPHA) == VIEW_IS_ANIMATING_ALPHA) { 12986 if (transformToApply != null || !childHasIdentityMatrix) { 12987 int transX = 0; 12988 int transY = 0; 12989 12990 if (offsetForScroll) { 12991 transX = -sx; 12992 transY = -sy; 12993 } 12994 12995 if (transformToApply != null) { 12996 if (concatMatrix) { 12997 if (useDisplayListProperties) { 12998 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12999 } else { 13000 // Undo the scroll translation, apply the transformation matrix, 13001 // then redo the scroll translate to get the correct result. 13002 canvas.translate(-transX, -transY); 13003 canvas.concat(transformToApply.getMatrix()); 13004 canvas.translate(transX, transY); 13005 } 13006 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13007 } 13008 13009 float transformAlpha = transformToApply.getAlpha(); 13010 if (transformAlpha < 1) { 13011 alpha *= transformAlpha; 13012 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13013 } 13014 } 13015 13016 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13017 canvas.translate(-transX, -transY); 13018 canvas.concat(getMatrix()); 13019 canvas.translate(transX, transY); 13020 } 13021 } 13022 13023 // Deal with alpha if it is or used to be <1 13024 if (alpha < 1 || 13025 (mPrivateFlags3 & VIEW_IS_ANIMATING_ALPHA) == VIEW_IS_ANIMATING_ALPHA) { 13026 if (alpha < 1) { 13027 mPrivateFlags3 |= VIEW_IS_ANIMATING_ALPHA; 13028 } else { 13029 mPrivateFlags3 &= ~VIEW_IS_ANIMATING_ALPHA; 13030 } 13031 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13032 if (hasNoCache) { 13033 final int multipliedAlpha = (int) (255 * alpha); 13034 if (!onSetAlpha(multipliedAlpha)) { 13035 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13036 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13037 layerType != LAYER_TYPE_NONE) { 13038 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13039 } 13040 if (useDisplayListProperties) { 13041 displayList.setAlpha(alpha * getAlpha()); 13042 } else if (layerType == LAYER_TYPE_NONE) { 13043 final int scrollX = hasDisplayList ? 0 : sx; 13044 final int scrollY = hasDisplayList ? 0 : sy; 13045 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13046 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13047 } 13048 } else { 13049 // Alpha is handled by the child directly, clobber the layer's alpha 13050 mPrivateFlags |= ALPHA_SET; 13051 } 13052 } 13053 } 13054 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13055 onSetAlpha(255); 13056 mPrivateFlags &= ~ALPHA_SET; 13057 } 13058 13059 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13060 !useDisplayListProperties) { 13061 if (offsetForScroll) { 13062 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13063 } else { 13064 if (!scalingRequired || cache == null) { 13065 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13066 } else { 13067 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13068 } 13069 } 13070 } 13071 13072 if (!useDisplayListProperties && hasDisplayList) { 13073 displayList = getDisplayList(); 13074 if (!displayList.isValid()) { 13075 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13076 // to getDisplayList(), the display list will be marked invalid and we should not 13077 // try to use it again. 13078 displayList = null; 13079 hasDisplayList = false; 13080 } 13081 } 13082 13083 if (hasNoCache) { 13084 boolean layerRendered = false; 13085 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13086 final HardwareLayer layer = getHardwareLayer(); 13087 if (layer != null && layer.isValid()) { 13088 mLayerPaint.setAlpha((int) (alpha * 255)); 13089 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13090 layerRendered = true; 13091 } else { 13092 final int scrollX = hasDisplayList ? 0 : sx; 13093 final int scrollY = hasDisplayList ? 0 : sy; 13094 canvas.saveLayer(scrollX, scrollY, 13095 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13096 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13097 } 13098 } 13099 13100 if (!layerRendered) { 13101 if (!hasDisplayList) { 13102 // Fast path for layouts with no backgrounds 13103 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13104 mPrivateFlags &= ~DIRTY_MASK; 13105 dispatchDraw(canvas); 13106 } else { 13107 draw(canvas); 13108 } 13109 } else { 13110 mPrivateFlags &= ~DIRTY_MASK; 13111 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13112 } 13113 } 13114 } else if (cache != null) { 13115 mPrivateFlags &= ~DIRTY_MASK; 13116 Paint cachePaint; 13117 13118 if (layerType == LAYER_TYPE_NONE) { 13119 cachePaint = parent.mCachePaint; 13120 if (cachePaint == null) { 13121 cachePaint = new Paint(); 13122 cachePaint.setDither(false); 13123 parent.mCachePaint = cachePaint; 13124 } 13125 if (alpha < 1) { 13126 cachePaint.setAlpha((int) (alpha * 255)); 13127 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13128 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13129 cachePaint.setAlpha(255); 13130 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13131 } 13132 } else { 13133 cachePaint = mLayerPaint; 13134 cachePaint.setAlpha((int) (alpha * 255)); 13135 } 13136 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13137 } 13138 13139 if (restoreTo >= 0) { 13140 canvas.restoreToCount(restoreTo); 13141 } 13142 13143 if (a != null && !more) { 13144 if (!hardwareAccelerated && !a.getFillAfter()) { 13145 onSetAlpha(255); 13146 } 13147 parent.finishAnimatingView(this, a); 13148 } 13149 13150 if (more && hardwareAccelerated) { 13151 // invalidation is the trigger to recreate display lists, so if we're using 13152 // display lists to render, force an invalidate to allow the animation to 13153 // continue drawing another frame 13154 parent.invalidate(true); 13155 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13156 // alpha animations should cause the child to recreate its display list 13157 invalidate(true); 13158 } 13159 } 13160 13161 mRecreateDisplayList = false; 13162 13163 return more; 13164 } 13165 13166 /** 13167 * Manually render this view (and all of its children) to the given Canvas. 13168 * The view must have already done a full layout before this function is 13169 * called. When implementing a view, implement 13170 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13171 * If you do need to override this method, call the superclass version. 13172 * 13173 * @param canvas The Canvas to which the View is rendered. 13174 */ 13175 public void draw(Canvas canvas) { 13176 final int privateFlags = mPrivateFlags; 13177 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13178 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13179 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13180 13181 /* 13182 * Draw traversal performs several drawing steps which must be executed 13183 * in the appropriate order: 13184 * 13185 * 1. Draw the background 13186 * 2. If necessary, save the canvas' layers to prepare for fading 13187 * 3. Draw view's content 13188 * 4. Draw children 13189 * 5. If necessary, draw the fading edges and restore layers 13190 * 6. Draw decorations (scrollbars for instance) 13191 */ 13192 13193 // Step 1, draw the background, if needed 13194 int saveCount; 13195 13196 if (!dirtyOpaque) { 13197 final Drawable background = mBackground; 13198 if (background != null) { 13199 final int scrollX = mScrollX; 13200 final int scrollY = mScrollY; 13201 13202 if (mBackgroundSizeChanged) { 13203 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13204 mBackgroundSizeChanged = false; 13205 } 13206 13207 if ((scrollX | scrollY) == 0) { 13208 background.draw(canvas); 13209 } else { 13210 canvas.translate(scrollX, scrollY); 13211 background.draw(canvas); 13212 canvas.translate(-scrollX, -scrollY); 13213 } 13214 } 13215 } 13216 13217 // skip step 2 & 5 if possible (common case) 13218 final int viewFlags = mViewFlags; 13219 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13220 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13221 if (!verticalEdges && !horizontalEdges) { 13222 // Step 3, draw the content 13223 if (!dirtyOpaque) onDraw(canvas); 13224 13225 // Step 4, draw the children 13226 dispatchDraw(canvas); 13227 13228 // Step 6, draw decorations (scrollbars) 13229 onDrawScrollBars(canvas); 13230 13231 // we're done... 13232 return; 13233 } 13234 13235 /* 13236 * Here we do the full fledged routine... 13237 * (this is an uncommon case where speed matters less, 13238 * this is why we repeat some of the tests that have been 13239 * done above) 13240 */ 13241 13242 boolean drawTop = false; 13243 boolean drawBottom = false; 13244 boolean drawLeft = false; 13245 boolean drawRight = false; 13246 13247 float topFadeStrength = 0.0f; 13248 float bottomFadeStrength = 0.0f; 13249 float leftFadeStrength = 0.0f; 13250 float rightFadeStrength = 0.0f; 13251 13252 // Step 2, save the canvas' layers 13253 int paddingLeft = mPaddingLeft; 13254 13255 final boolean offsetRequired = isPaddingOffsetRequired(); 13256 if (offsetRequired) { 13257 paddingLeft += getLeftPaddingOffset(); 13258 } 13259 13260 int left = mScrollX + paddingLeft; 13261 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13262 int top = mScrollY + getFadeTop(offsetRequired); 13263 int bottom = top + getFadeHeight(offsetRequired); 13264 13265 if (offsetRequired) { 13266 right += getRightPaddingOffset(); 13267 bottom += getBottomPaddingOffset(); 13268 } 13269 13270 final ScrollabilityCache scrollabilityCache = mScrollCache; 13271 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13272 int length = (int) fadeHeight; 13273 13274 // clip the fade length if top and bottom fades overlap 13275 // overlapping fades produce odd-looking artifacts 13276 if (verticalEdges && (top + length > bottom - length)) { 13277 length = (bottom - top) / 2; 13278 } 13279 13280 // also clip horizontal fades if necessary 13281 if (horizontalEdges && (left + length > right - length)) { 13282 length = (right - left) / 2; 13283 } 13284 13285 if (verticalEdges) { 13286 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13287 drawTop = topFadeStrength * fadeHeight > 1.0f; 13288 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13289 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13290 } 13291 13292 if (horizontalEdges) { 13293 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13294 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13295 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13296 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13297 } 13298 13299 saveCount = canvas.getSaveCount(); 13300 13301 int solidColor = getSolidColor(); 13302 if (solidColor == 0) { 13303 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13304 13305 if (drawTop) { 13306 canvas.saveLayer(left, top, right, top + length, null, flags); 13307 } 13308 13309 if (drawBottom) { 13310 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13311 } 13312 13313 if (drawLeft) { 13314 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13315 } 13316 13317 if (drawRight) { 13318 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13319 } 13320 } else { 13321 scrollabilityCache.setFadeColor(solidColor); 13322 } 13323 13324 // Step 3, draw the content 13325 if (!dirtyOpaque) onDraw(canvas); 13326 13327 // Step 4, draw the children 13328 dispatchDraw(canvas); 13329 13330 // Step 5, draw the fade effect and restore layers 13331 final Paint p = scrollabilityCache.paint; 13332 final Matrix matrix = scrollabilityCache.matrix; 13333 final Shader fade = scrollabilityCache.shader; 13334 13335 if (drawTop) { 13336 matrix.setScale(1, fadeHeight * topFadeStrength); 13337 matrix.postTranslate(left, top); 13338 fade.setLocalMatrix(matrix); 13339 canvas.drawRect(left, top, right, top + length, p); 13340 } 13341 13342 if (drawBottom) { 13343 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13344 matrix.postRotate(180); 13345 matrix.postTranslate(left, bottom); 13346 fade.setLocalMatrix(matrix); 13347 canvas.drawRect(left, bottom - length, right, bottom, p); 13348 } 13349 13350 if (drawLeft) { 13351 matrix.setScale(1, fadeHeight * leftFadeStrength); 13352 matrix.postRotate(-90); 13353 matrix.postTranslate(left, top); 13354 fade.setLocalMatrix(matrix); 13355 canvas.drawRect(left, top, left + length, bottom, p); 13356 } 13357 13358 if (drawRight) { 13359 matrix.setScale(1, fadeHeight * rightFadeStrength); 13360 matrix.postRotate(90); 13361 matrix.postTranslate(right, top); 13362 fade.setLocalMatrix(matrix); 13363 canvas.drawRect(right - length, top, right, bottom, p); 13364 } 13365 13366 canvas.restoreToCount(saveCount); 13367 13368 // Step 6, draw decorations (scrollbars) 13369 onDrawScrollBars(canvas); 13370 } 13371 13372 /** 13373 * Override this if your view is known to always be drawn on top of a solid color background, 13374 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13375 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13376 * should be set to 0xFF. 13377 * 13378 * @see #setVerticalFadingEdgeEnabled(boolean) 13379 * @see #setHorizontalFadingEdgeEnabled(boolean) 13380 * 13381 * @return The known solid color background for this view, or 0 if the color may vary 13382 */ 13383 @ViewDebug.ExportedProperty(category = "drawing") 13384 public int getSolidColor() { 13385 return 0; 13386 } 13387 13388 /** 13389 * Build a human readable string representation of the specified view flags. 13390 * 13391 * @param flags the view flags to convert to a string 13392 * @return a String representing the supplied flags 13393 */ 13394 private static String printFlags(int flags) { 13395 String output = ""; 13396 int numFlags = 0; 13397 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13398 output += "TAKES_FOCUS"; 13399 numFlags++; 13400 } 13401 13402 switch (flags & VISIBILITY_MASK) { 13403 case INVISIBLE: 13404 if (numFlags > 0) { 13405 output += " "; 13406 } 13407 output += "INVISIBLE"; 13408 // USELESS HERE numFlags++; 13409 break; 13410 case GONE: 13411 if (numFlags > 0) { 13412 output += " "; 13413 } 13414 output += "GONE"; 13415 // USELESS HERE numFlags++; 13416 break; 13417 default: 13418 break; 13419 } 13420 return output; 13421 } 13422 13423 /** 13424 * Build a human readable string representation of the specified private 13425 * view flags. 13426 * 13427 * @param privateFlags the private view flags to convert to a string 13428 * @return a String representing the supplied flags 13429 */ 13430 private static String printPrivateFlags(int privateFlags) { 13431 String output = ""; 13432 int numFlags = 0; 13433 13434 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13435 output += "WANTS_FOCUS"; 13436 numFlags++; 13437 } 13438 13439 if ((privateFlags & FOCUSED) == FOCUSED) { 13440 if (numFlags > 0) { 13441 output += " "; 13442 } 13443 output += "FOCUSED"; 13444 numFlags++; 13445 } 13446 13447 if ((privateFlags & SELECTED) == SELECTED) { 13448 if (numFlags > 0) { 13449 output += " "; 13450 } 13451 output += "SELECTED"; 13452 numFlags++; 13453 } 13454 13455 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13456 if (numFlags > 0) { 13457 output += " "; 13458 } 13459 output += "IS_ROOT_NAMESPACE"; 13460 numFlags++; 13461 } 13462 13463 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13464 if (numFlags > 0) { 13465 output += " "; 13466 } 13467 output += "HAS_BOUNDS"; 13468 numFlags++; 13469 } 13470 13471 if ((privateFlags & DRAWN) == DRAWN) { 13472 if (numFlags > 0) { 13473 output += " "; 13474 } 13475 output += "DRAWN"; 13476 // USELESS HERE numFlags++; 13477 } 13478 return output; 13479 } 13480 13481 /** 13482 * <p>Indicates whether or not this view's layout will be requested during 13483 * the next hierarchy layout pass.</p> 13484 * 13485 * @return true if the layout will be forced during next layout pass 13486 */ 13487 public boolean isLayoutRequested() { 13488 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13489 } 13490 13491 /** 13492 * Assign a size and position to a view and all of its 13493 * descendants 13494 * 13495 * <p>This is the second phase of the layout mechanism. 13496 * (The first is measuring). In this phase, each parent calls 13497 * layout on all of its children to position them. 13498 * This is typically done using the child measurements 13499 * that were stored in the measure pass().</p> 13500 * 13501 * <p>Derived classes should not override this method. 13502 * Derived classes with children should override 13503 * onLayout. In that method, they should 13504 * call layout on each of their children.</p> 13505 * 13506 * @param l Left position, relative to parent 13507 * @param t Top position, relative to parent 13508 * @param r Right position, relative to parent 13509 * @param b Bottom position, relative to parent 13510 */ 13511 @SuppressWarnings({"unchecked"}) 13512 public void layout(int l, int t, int r, int b) { 13513 int oldL = mLeft; 13514 int oldT = mTop; 13515 int oldB = mBottom; 13516 int oldR = mRight; 13517 boolean changed = setFrame(l, t, r, b); 13518 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13519 onLayout(changed, l, t, r, b); 13520 mPrivateFlags &= ~LAYOUT_REQUIRED; 13521 13522 ListenerInfo li = mListenerInfo; 13523 if (li != null && li.mOnLayoutChangeListeners != null) { 13524 ArrayList<OnLayoutChangeListener> listenersCopy = 13525 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13526 int numListeners = listenersCopy.size(); 13527 for (int i = 0; i < numListeners; ++i) { 13528 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13529 } 13530 } 13531 } 13532 mPrivateFlags &= ~FORCE_LAYOUT; 13533 } 13534 13535 /** 13536 * Called from layout when this view should 13537 * assign a size and position to each of its children. 13538 * 13539 * Derived classes with children should override 13540 * this method and call layout on each of 13541 * their children. 13542 * @param changed This is a new size or position for this view 13543 * @param left Left position, relative to parent 13544 * @param top Top position, relative to parent 13545 * @param right Right position, relative to parent 13546 * @param bottom Bottom position, relative to parent 13547 */ 13548 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13549 } 13550 13551 /** 13552 * Assign a size and position to this view. 13553 * 13554 * This is called from layout. 13555 * 13556 * @param left Left position, relative to parent 13557 * @param top Top position, relative to parent 13558 * @param right Right position, relative to parent 13559 * @param bottom Bottom position, relative to parent 13560 * @return true if the new size and position are different than the 13561 * previous ones 13562 * {@hide} 13563 */ 13564 protected boolean setFrame(int left, int top, int right, int bottom) { 13565 boolean changed = false; 13566 13567 if (DBG) { 13568 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13569 + right + "," + bottom + ")"); 13570 } 13571 13572 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13573 changed = true; 13574 13575 // Remember our drawn bit 13576 int drawn = mPrivateFlags & DRAWN; 13577 13578 int oldWidth = mRight - mLeft; 13579 int oldHeight = mBottom - mTop; 13580 int newWidth = right - left; 13581 int newHeight = bottom - top; 13582 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13583 13584 // Invalidate our old position 13585 invalidate(sizeChanged); 13586 13587 mLeft = left; 13588 mTop = top; 13589 mRight = right; 13590 mBottom = bottom; 13591 if (mDisplayList != null) { 13592 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13593 } 13594 13595 mPrivateFlags |= HAS_BOUNDS; 13596 13597 13598 if (sizeChanged) { 13599 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13600 // A change in dimension means an auto-centered pivot point changes, too 13601 if (mTransformationInfo != null) { 13602 mTransformationInfo.mMatrixDirty = true; 13603 } 13604 } 13605 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13606 } 13607 13608 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13609 // If we are visible, force the DRAWN bit to on so that 13610 // this invalidate will go through (at least to our parent). 13611 // This is because someone may have invalidated this view 13612 // before this call to setFrame came in, thereby clearing 13613 // the DRAWN bit. 13614 mPrivateFlags |= DRAWN; 13615 invalidate(sizeChanged); 13616 // parent display list may need to be recreated based on a change in the bounds 13617 // of any child 13618 invalidateParentCaches(); 13619 } 13620 13621 // Reset drawn bit to original value (invalidate turns it off) 13622 mPrivateFlags |= drawn; 13623 13624 mBackgroundSizeChanged = true; 13625 } 13626 return changed; 13627 } 13628 13629 /** 13630 * Finalize inflating a view from XML. This is called as the last phase 13631 * of inflation, after all child views have been added. 13632 * 13633 * <p>Even if the subclass overrides onFinishInflate, they should always be 13634 * sure to call the super method, so that we get called. 13635 */ 13636 protected void onFinishInflate() { 13637 } 13638 13639 /** 13640 * Returns the resources associated with this view. 13641 * 13642 * @return Resources object. 13643 */ 13644 public Resources getResources() { 13645 return mResources; 13646 } 13647 13648 /** 13649 * Invalidates the specified Drawable. 13650 * 13651 * @param drawable the drawable to invalidate 13652 */ 13653 public void invalidateDrawable(Drawable drawable) { 13654 if (verifyDrawable(drawable)) { 13655 final Rect dirty = drawable.getBounds(); 13656 final int scrollX = mScrollX; 13657 final int scrollY = mScrollY; 13658 13659 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13660 dirty.right + scrollX, dirty.bottom + scrollY); 13661 } 13662 } 13663 13664 /** 13665 * Schedules an action on a drawable to occur at a specified time. 13666 * 13667 * @param who the recipient of the action 13668 * @param what the action to run on the drawable 13669 * @param when the time at which the action must occur. Uses the 13670 * {@link SystemClock#uptimeMillis} timebase. 13671 */ 13672 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13673 if (verifyDrawable(who) && what != null) { 13674 final long delay = when - SystemClock.uptimeMillis(); 13675 if (mAttachInfo != null) { 13676 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13677 Choreographer.CALLBACK_ANIMATION, what, who, 13678 Choreographer.subtractFrameDelay(delay)); 13679 } else { 13680 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13681 } 13682 } 13683 } 13684 13685 /** 13686 * Cancels a scheduled action on a drawable. 13687 * 13688 * @param who the recipient of the action 13689 * @param what the action to cancel 13690 */ 13691 public void unscheduleDrawable(Drawable who, Runnable what) { 13692 if (verifyDrawable(who) && what != null) { 13693 if (mAttachInfo != null) { 13694 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13695 Choreographer.CALLBACK_ANIMATION, what, who); 13696 } else { 13697 ViewRootImpl.getRunQueue().removeCallbacks(what); 13698 } 13699 } 13700 } 13701 13702 /** 13703 * Unschedule any events associated with the given Drawable. This can be 13704 * used when selecting a new Drawable into a view, so that the previous 13705 * one is completely unscheduled. 13706 * 13707 * @param who The Drawable to unschedule. 13708 * 13709 * @see #drawableStateChanged 13710 */ 13711 public void unscheduleDrawable(Drawable who) { 13712 if (mAttachInfo != null && who != null) { 13713 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13714 Choreographer.CALLBACK_ANIMATION, null, who); 13715 } 13716 } 13717 13718 /** 13719 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 13720 * that the View directionality can and will be resolved before its Drawables. 13721 * 13722 * Will call {@link View#onResolveDrawables} when resolution is done. 13723 */ 13724 public void resolveDrawables() { 13725 if (mBackground != null) { 13726 mBackground.setLayoutDirection(getResolvedLayoutDirection()); 13727 } 13728 onResolveDrawables(getResolvedLayoutDirection()); 13729 } 13730 13731 /** 13732 * Called when layout direction has been resolved. 13733 * 13734 * The default implementation does nothing. 13735 * 13736 * @param layoutDirection The resolved layout direction. 13737 * 13738 * @see {@link #LAYOUT_DIRECTION_LTR} 13739 * @see {@link #LAYOUT_DIRECTION_RTL} 13740 */ 13741 public void onResolveDrawables(int layoutDirection) { 13742 } 13743 13744 /** 13745 * If your view subclass is displaying its own Drawable objects, it should 13746 * override this function and return true for any Drawable it is 13747 * displaying. This allows animations for those drawables to be 13748 * scheduled. 13749 * 13750 * <p>Be sure to call through to the super class when overriding this 13751 * function. 13752 * 13753 * @param who The Drawable to verify. Return true if it is one you are 13754 * displaying, else return the result of calling through to the 13755 * super class. 13756 * 13757 * @return boolean If true than the Drawable is being displayed in the 13758 * view; else false and it is not allowed to animate. 13759 * 13760 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13761 * @see #drawableStateChanged() 13762 */ 13763 protected boolean verifyDrawable(Drawable who) { 13764 return who == mBackground; 13765 } 13766 13767 /** 13768 * This function is called whenever the state of the view changes in such 13769 * a way that it impacts the state of drawables being shown. 13770 * 13771 * <p>Be sure to call through to the superclass when overriding this 13772 * function. 13773 * 13774 * @see Drawable#setState(int[]) 13775 */ 13776 protected void drawableStateChanged() { 13777 Drawable d = mBackground; 13778 if (d != null && d.isStateful()) { 13779 d.setState(getDrawableState()); 13780 } 13781 } 13782 13783 /** 13784 * Call this to force a view to update its drawable state. This will cause 13785 * drawableStateChanged to be called on this view. Views that are interested 13786 * in the new state should call getDrawableState. 13787 * 13788 * @see #drawableStateChanged 13789 * @see #getDrawableState 13790 */ 13791 public void refreshDrawableState() { 13792 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13793 drawableStateChanged(); 13794 13795 ViewParent parent = mParent; 13796 if (parent != null) { 13797 parent.childDrawableStateChanged(this); 13798 } 13799 } 13800 13801 /** 13802 * Return an array of resource IDs of the drawable states representing the 13803 * current state of the view. 13804 * 13805 * @return The current drawable state 13806 * 13807 * @see Drawable#setState(int[]) 13808 * @see #drawableStateChanged() 13809 * @see #onCreateDrawableState(int) 13810 */ 13811 public final int[] getDrawableState() { 13812 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13813 return mDrawableState; 13814 } else { 13815 mDrawableState = onCreateDrawableState(0); 13816 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13817 return mDrawableState; 13818 } 13819 } 13820 13821 /** 13822 * Generate the new {@link android.graphics.drawable.Drawable} state for 13823 * this view. This is called by the view 13824 * system when the cached Drawable state is determined to be invalid. To 13825 * retrieve the current state, you should use {@link #getDrawableState}. 13826 * 13827 * @param extraSpace if non-zero, this is the number of extra entries you 13828 * would like in the returned array in which you can place your own 13829 * states. 13830 * 13831 * @return Returns an array holding the current {@link Drawable} state of 13832 * the view. 13833 * 13834 * @see #mergeDrawableStates(int[], int[]) 13835 */ 13836 protected int[] onCreateDrawableState(int extraSpace) { 13837 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13838 mParent instanceof View) { 13839 return ((View) mParent).onCreateDrawableState(extraSpace); 13840 } 13841 13842 int[] drawableState; 13843 13844 int privateFlags = mPrivateFlags; 13845 13846 int viewStateIndex = 0; 13847 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13848 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13849 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13850 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13851 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13852 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13853 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13854 HardwareRenderer.isAvailable()) { 13855 // This is set if HW acceleration is requested, even if the current 13856 // process doesn't allow it. This is just to allow app preview 13857 // windows to better match their app. 13858 viewStateIndex |= VIEW_STATE_ACCELERATED; 13859 } 13860 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13861 13862 final int privateFlags2 = mPrivateFlags2; 13863 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13864 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13865 13866 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13867 13868 //noinspection ConstantIfStatement 13869 if (false) { 13870 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13871 Log.i("View", toString() 13872 + " pressed=" + ((privateFlags & PRESSED) != 0) 13873 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13874 + " fo=" + hasFocus() 13875 + " sl=" + ((privateFlags & SELECTED) != 0) 13876 + " wf=" + hasWindowFocus() 13877 + ": " + Arrays.toString(drawableState)); 13878 } 13879 13880 if (extraSpace == 0) { 13881 return drawableState; 13882 } 13883 13884 final int[] fullState; 13885 if (drawableState != null) { 13886 fullState = new int[drawableState.length + extraSpace]; 13887 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13888 } else { 13889 fullState = new int[extraSpace]; 13890 } 13891 13892 return fullState; 13893 } 13894 13895 /** 13896 * Merge your own state values in <var>additionalState</var> into the base 13897 * state values <var>baseState</var> that were returned by 13898 * {@link #onCreateDrawableState(int)}. 13899 * 13900 * @param baseState The base state values returned by 13901 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13902 * own additional state values. 13903 * 13904 * @param additionalState The additional state values you would like 13905 * added to <var>baseState</var>; this array is not modified. 13906 * 13907 * @return As a convenience, the <var>baseState</var> array you originally 13908 * passed into the function is returned. 13909 * 13910 * @see #onCreateDrawableState(int) 13911 */ 13912 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13913 final int N = baseState.length; 13914 int i = N - 1; 13915 while (i >= 0 && baseState[i] == 0) { 13916 i--; 13917 } 13918 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13919 return baseState; 13920 } 13921 13922 /** 13923 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13924 * on all Drawable objects associated with this view. 13925 */ 13926 public void jumpDrawablesToCurrentState() { 13927 if (mBackground != null) { 13928 mBackground.jumpToCurrentState(); 13929 } 13930 } 13931 13932 /** 13933 * Sets the background color for this view. 13934 * @param color the color of the background 13935 */ 13936 @RemotableViewMethod 13937 public void setBackgroundColor(int color) { 13938 if (mBackground instanceof ColorDrawable) { 13939 ((ColorDrawable) mBackground).setColor(color); 13940 computeOpaqueFlags(); 13941 } else { 13942 setBackground(new ColorDrawable(color)); 13943 } 13944 } 13945 13946 /** 13947 * Set the background to a given resource. The resource should refer to 13948 * a Drawable object or 0 to remove the background. 13949 * @param resid The identifier of the resource. 13950 * 13951 * @attr ref android.R.styleable#View_background 13952 */ 13953 @RemotableViewMethod 13954 public void setBackgroundResource(int resid) { 13955 if (resid != 0 && resid == mBackgroundResource) { 13956 return; 13957 } 13958 13959 Drawable d= null; 13960 if (resid != 0) { 13961 d = mResources.getDrawable(resid); 13962 } 13963 setBackground(d); 13964 13965 mBackgroundResource = resid; 13966 } 13967 13968 /** 13969 * Set the background to a given Drawable, or remove the background. If the 13970 * background has padding, this View's padding is set to the background's 13971 * padding. However, when a background is removed, this View's padding isn't 13972 * touched. If setting the padding is desired, please use 13973 * {@link #setPadding(int, int, int, int)}. 13974 * 13975 * @param background The Drawable to use as the background, or null to remove the 13976 * background 13977 */ 13978 public void setBackground(Drawable background) { 13979 //noinspection deprecation 13980 setBackgroundDrawable(background); 13981 } 13982 13983 /** 13984 * @deprecated use {@link #setBackground(Drawable)} instead 13985 */ 13986 @Deprecated 13987 public void setBackgroundDrawable(Drawable background) { 13988 computeOpaqueFlags(); 13989 13990 if (background == mBackground) { 13991 return; 13992 } 13993 13994 boolean requestLayout = false; 13995 13996 mBackgroundResource = 0; 13997 13998 /* 13999 * Regardless of whether we're setting a new background or not, we want 14000 * to clear the previous drawable. 14001 */ 14002 if (mBackground != null) { 14003 mBackground.setCallback(null); 14004 unscheduleDrawable(mBackground); 14005 } 14006 14007 if (background != null) { 14008 Rect padding = sThreadLocal.get(); 14009 if (padding == null) { 14010 padding = new Rect(); 14011 sThreadLocal.set(padding); 14012 } 14013 background.setLayoutDirection(getResolvedLayoutDirection()); 14014 if (background.getPadding(padding)) { 14015 switch (background.getLayoutDirection()) { 14016 case LAYOUT_DIRECTION_RTL: 14017 setPadding(padding.right, padding.top, padding.left, padding.bottom); 14018 break; 14019 case LAYOUT_DIRECTION_LTR: 14020 default: 14021 setPadding(padding.left, padding.top, padding.right, padding.bottom); 14022 } 14023 } 14024 14025 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14026 // if it has a different minimum size, we should layout again 14027 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14028 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14029 requestLayout = true; 14030 } 14031 14032 background.setCallback(this); 14033 if (background.isStateful()) { 14034 background.setState(getDrawableState()); 14035 } 14036 background.setVisible(getVisibility() == VISIBLE, false); 14037 mBackground = background; 14038 14039 if ((mPrivateFlags & SKIP_DRAW) != 0) { 14040 mPrivateFlags &= ~SKIP_DRAW; 14041 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 14042 requestLayout = true; 14043 } 14044 } else { 14045 /* Remove the background */ 14046 mBackground = null; 14047 14048 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14049 /* 14050 * This view ONLY drew the background before and we're removing 14051 * the background, so now it won't draw anything 14052 * (hence we SKIP_DRAW) 14053 */ 14054 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14055 mPrivateFlags |= SKIP_DRAW; 14056 } 14057 14058 /* 14059 * When the background is set, we try to apply its padding to this 14060 * View. When the background is removed, we don't touch this View's 14061 * padding. This is noted in the Javadocs. Hence, we don't need to 14062 * requestLayout(), the invalidate() below is sufficient. 14063 */ 14064 14065 // The old background's minimum size could have affected this 14066 // View's layout, so let's requestLayout 14067 requestLayout = true; 14068 } 14069 14070 computeOpaqueFlags(); 14071 14072 if (requestLayout) { 14073 requestLayout(); 14074 } 14075 14076 mBackgroundSizeChanged = true; 14077 invalidate(true); 14078 } 14079 14080 /** 14081 * Gets the background drawable 14082 * 14083 * @return The drawable used as the background for this view, if any. 14084 * 14085 * @see #setBackground(Drawable) 14086 * 14087 * @attr ref android.R.styleable#View_background 14088 */ 14089 public Drawable getBackground() { 14090 return mBackground; 14091 } 14092 14093 /** 14094 * Sets the padding. The view may add on the space required to display 14095 * the scrollbars, depending on the style and visibility of the scrollbars. 14096 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14097 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14098 * from the values set in this call. 14099 * 14100 * @attr ref android.R.styleable#View_padding 14101 * @attr ref android.R.styleable#View_paddingBottom 14102 * @attr ref android.R.styleable#View_paddingLeft 14103 * @attr ref android.R.styleable#View_paddingRight 14104 * @attr ref android.R.styleable#View_paddingTop 14105 * @param left the left padding in pixels 14106 * @param top the top padding in pixels 14107 * @param right the right padding in pixels 14108 * @param bottom the bottom padding in pixels 14109 */ 14110 public void setPadding(int left, int top, int right, int bottom) { 14111 mUserPaddingStart = -1; 14112 mUserPaddingEnd = -1; 14113 mUserPaddingRelative = false; 14114 14115 internalSetPadding(left, top, right, bottom); 14116 } 14117 14118 private void internalSetPadding(int left, int top, int right, int bottom) { 14119 mUserPaddingLeft = left; 14120 mUserPaddingRight = right; 14121 mUserPaddingBottom = bottom; 14122 14123 final int viewFlags = mViewFlags; 14124 boolean changed = false; 14125 14126 // Common case is there are no scroll bars. 14127 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14128 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14129 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14130 ? 0 : getVerticalScrollbarWidth(); 14131 switch (mVerticalScrollbarPosition) { 14132 case SCROLLBAR_POSITION_DEFAULT: 14133 if (isLayoutRtl()) { 14134 left += offset; 14135 } else { 14136 right += offset; 14137 } 14138 break; 14139 case SCROLLBAR_POSITION_RIGHT: 14140 right += offset; 14141 break; 14142 case SCROLLBAR_POSITION_LEFT: 14143 left += offset; 14144 break; 14145 } 14146 } 14147 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14148 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14149 ? 0 : getHorizontalScrollbarHeight(); 14150 } 14151 } 14152 14153 if (mPaddingLeft != left) { 14154 changed = true; 14155 mPaddingLeft = left; 14156 } 14157 if (mPaddingTop != top) { 14158 changed = true; 14159 mPaddingTop = top; 14160 } 14161 if (mPaddingRight != right) { 14162 changed = true; 14163 mPaddingRight = right; 14164 } 14165 if (mPaddingBottom != bottom) { 14166 changed = true; 14167 mPaddingBottom = bottom; 14168 } 14169 14170 if (changed) { 14171 requestLayout(); 14172 } 14173 } 14174 14175 /** 14176 * Sets the relative padding. The view may add on the space required to display 14177 * the scrollbars, depending on the style and visibility of the scrollbars. 14178 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14179 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14180 * from the values set in this call. 14181 * 14182 * @attr ref android.R.styleable#View_padding 14183 * @attr ref android.R.styleable#View_paddingBottom 14184 * @attr ref android.R.styleable#View_paddingStart 14185 * @attr ref android.R.styleable#View_paddingEnd 14186 * @attr ref android.R.styleable#View_paddingTop 14187 * @param start the start padding in pixels 14188 * @param top the top padding in pixels 14189 * @param end the end padding in pixels 14190 * @param bottom the bottom padding in pixels 14191 */ 14192 public void setPaddingRelative(int start, int top, int end, int bottom) { 14193 mUserPaddingStart = start; 14194 mUserPaddingEnd = end; 14195 mUserPaddingRelative = true; 14196 14197 switch(getResolvedLayoutDirection()) { 14198 case LAYOUT_DIRECTION_RTL: 14199 internalSetPadding(end, top, start, bottom); 14200 break; 14201 case LAYOUT_DIRECTION_LTR: 14202 default: 14203 internalSetPadding(start, top, end, bottom); 14204 } 14205 } 14206 14207 /** 14208 * Returns the top padding of this view. 14209 * 14210 * @return the top padding in pixels 14211 */ 14212 public int getPaddingTop() { 14213 return mPaddingTop; 14214 } 14215 14216 /** 14217 * Returns the bottom padding of this view. If there are inset and enabled 14218 * scrollbars, this value may include the space required to display the 14219 * scrollbars as well. 14220 * 14221 * @return the bottom padding in pixels 14222 */ 14223 public int getPaddingBottom() { 14224 return mPaddingBottom; 14225 } 14226 14227 /** 14228 * Returns the left padding of this view. If there are inset and enabled 14229 * scrollbars, this value may include the space required to display the 14230 * scrollbars as well. 14231 * 14232 * @return the left padding in pixels 14233 */ 14234 public int getPaddingLeft() { 14235 return mPaddingLeft; 14236 } 14237 14238 /** 14239 * Returns the start padding of this view depending on its resolved layout direction. 14240 * If there are inset and enabled scrollbars, this value may include the space 14241 * required to display the scrollbars as well. 14242 * 14243 * @return the start padding in pixels 14244 */ 14245 public int getPaddingStart() { 14246 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14247 mPaddingRight : mPaddingLeft; 14248 } 14249 14250 /** 14251 * Returns the right padding of this view. If there are inset and enabled 14252 * scrollbars, this value may include the space required to display the 14253 * scrollbars as well. 14254 * 14255 * @return the right padding in pixels 14256 */ 14257 public int getPaddingRight() { 14258 return mPaddingRight; 14259 } 14260 14261 /** 14262 * Returns the end padding of this view depending on its resolved layout direction. 14263 * If there are inset and enabled scrollbars, this value may include the space 14264 * required to display the scrollbars as well. 14265 * 14266 * @return the end padding in pixels 14267 */ 14268 public int getPaddingEnd() { 14269 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14270 mPaddingLeft : mPaddingRight; 14271 } 14272 14273 /** 14274 * Return if the padding as been set thru relative values 14275 * {@link #setPaddingRelative(int, int, int, int)} or thru 14276 * @attr ref android.R.styleable#View_paddingStart or 14277 * @attr ref android.R.styleable#View_paddingEnd 14278 * 14279 * @return true if the padding is relative or false if it is not. 14280 */ 14281 public boolean isPaddingRelative() { 14282 return mUserPaddingRelative; 14283 } 14284 14285 /** 14286 * @hide 14287 */ 14288 public Insets getOpticalInsets() { 14289 if (mLayoutInsets == null) { 14290 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14291 } 14292 return mLayoutInsets; 14293 } 14294 14295 /** 14296 * @hide 14297 */ 14298 public void setLayoutInsets(Insets layoutInsets) { 14299 mLayoutInsets = layoutInsets; 14300 } 14301 14302 /** 14303 * Changes the selection state of this view. A view can be selected or not. 14304 * Note that selection is not the same as focus. Views are typically 14305 * selected in the context of an AdapterView like ListView or GridView; 14306 * the selected view is the view that is highlighted. 14307 * 14308 * @param selected true if the view must be selected, false otherwise 14309 */ 14310 public void setSelected(boolean selected) { 14311 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14312 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14313 if (!selected) resetPressedState(); 14314 invalidate(true); 14315 refreshDrawableState(); 14316 dispatchSetSelected(selected); 14317 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14318 notifyAccessibilityStateChanged(); 14319 } 14320 } 14321 } 14322 14323 /** 14324 * Dispatch setSelected to all of this View's children. 14325 * 14326 * @see #setSelected(boolean) 14327 * 14328 * @param selected The new selected state 14329 */ 14330 protected void dispatchSetSelected(boolean selected) { 14331 } 14332 14333 /** 14334 * Indicates the selection state of this view. 14335 * 14336 * @return true if the view is selected, false otherwise 14337 */ 14338 @ViewDebug.ExportedProperty 14339 public boolean isSelected() { 14340 return (mPrivateFlags & SELECTED) != 0; 14341 } 14342 14343 /** 14344 * Changes the activated state of this view. A view can be activated or not. 14345 * Note that activation is not the same as selection. Selection is 14346 * a transient property, representing the view (hierarchy) the user is 14347 * currently interacting with. Activation is a longer-term state that the 14348 * user can move views in and out of. For example, in a list view with 14349 * single or multiple selection enabled, the views in the current selection 14350 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14351 * here.) The activated state is propagated down to children of the view it 14352 * is set on. 14353 * 14354 * @param activated true if the view must be activated, false otherwise 14355 */ 14356 public void setActivated(boolean activated) { 14357 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14358 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14359 invalidate(true); 14360 refreshDrawableState(); 14361 dispatchSetActivated(activated); 14362 } 14363 } 14364 14365 /** 14366 * Dispatch setActivated to all of this View's children. 14367 * 14368 * @see #setActivated(boolean) 14369 * 14370 * @param activated The new activated state 14371 */ 14372 protected void dispatchSetActivated(boolean activated) { 14373 } 14374 14375 /** 14376 * Indicates the activation state of this view. 14377 * 14378 * @return true if the view is activated, false otherwise 14379 */ 14380 @ViewDebug.ExportedProperty 14381 public boolean isActivated() { 14382 return (mPrivateFlags & ACTIVATED) != 0; 14383 } 14384 14385 /** 14386 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14387 * observer can be used to get notifications when global events, like 14388 * layout, happen. 14389 * 14390 * The returned ViewTreeObserver observer is not guaranteed to remain 14391 * valid for the lifetime of this View. If the caller of this method keeps 14392 * a long-lived reference to ViewTreeObserver, it should always check for 14393 * the return value of {@link ViewTreeObserver#isAlive()}. 14394 * 14395 * @return The ViewTreeObserver for this view's hierarchy. 14396 */ 14397 public ViewTreeObserver getViewTreeObserver() { 14398 if (mAttachInfo != null) { 14399 return mAttachInfo.mTreeObserver; 14400 } 14401 if (mFloatingTreeObserver == null) { 14402 mFloatingTreeObserver = new ViewTreeObserver(); 14403 } 14404 return mFloatingTreeObserver; 14405 } 14406 14407 /** 14408 * <p>Finds the topmost view in the current view hierarchy.</p> 14409 * 14410 * @return the topmost view containing this view 14411 */ 14412 public View getRootView() { 14413 if (mAttachInfo != null) { 14414 final View v = mAttachInfo.mRootView; 14415 if (v != null) { 14416 return v; 14417 } 14418 } 14419 14420 View parent = this; 14421 14422 while (parent.mParent != null && parent.mParent instanceof View) { 14423 parent = (View) parent.mParent; 14424 } 14425 14426 return parent; 14427 } 14428 14429 /** 14430 * <p>Computes the coordinates of this view on the screen. The argument 14431 * must be an array of two integers. After the method returns, the array 14432 * contains the x and y location in that order.</p> 14433 * 14434 * @param location an array of two integers in which to hold the coordinates 14435 */ 14436 public void getLocationOnScreen(int[] location) { 14437 getLocationInWindow(location); 14438 14439 final AttachInfo info = mAttachInfo; 14440 if (info != null) { 14441 location[0] += info.mWindowLeft; 14442 location[1] += info.mWindowTop; 14443 } 14444 } 14445 14446 /** 14447 * <p>Computes the coordinates of this view in its window. The argument 14448 * must be an array of two integers. After the method returns, the array 14449 * contains the x and y location in that order.</p> 14450 * 14451 * @param location an array of two integers in which to hold the coordinates 14452 */ 14453 public void getLocationInWindow(int[] location) { 14454 if (location == null || location.length < 2) { 14455 throw new IllegalArgumentException("location must be an array of two integers"); 14456 } 14457 14458 if (mAttachInfo == null) { 14459 // When the view is not attached to a window, this method does not make sense 14460 location[0] = location[1] = 0; 14461 return; 14462 } 14463 14464 float[] position = mAttachInfo.mTmpTransformLocation; 14465 position[0] = position[1] = 0.0f; 14466 14467 if (!hasIdentityMatrix()) { 14468 getMatrix().mapPoints(position); 14469 } 14470 14471 position[0] += mLeft; 14472 position[1] += mTop; 14473 14474 ViewParent viewParent = mParent; 14475 while (viewParent instanceof View) { 14476 final View view = (View) viewParent; 14477 14478 position[0] -= view.mScrollX; 14479 position[1] -= view.mScrollY; 14480 14481 if (!view.hasIdentityMatrix()) { 14482 view.getMatrix().mapPoints(position); 14483 } 14484 14485 position[0] += view.mLeft; 14486 position[1] += view.mTop; 14487 14488 viewParent = view.mParent; 14489 } 14490 14491 if (viewParent instanceof ViewRootImpl) { 14492 // *cough* 14493 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14494 position[1] -= vr.mCurScrollY; 14495 } 14496 14497 location[0] = (int) (position[0] + 0.5f); 14498 location[1] = (int) (position[1] + 0.5f); 14499 } 14500 14501 /** 14502 * {@hide} 14503 * @param id the id of the view to be found 14504 * @return the view of the specified id, null if cannot be found 14505 */ 14506 protected View findViewTraversal(int id) { 14507 if (id == mID) { 14508 return this; 14509 } 14510 return null; 14511 } 14512 14513 /** 14514 * {@hide} 14515 * @param tag the tag of the view to be found 14516 * @return the view of specified tag, null if cannot be found 14517 */ 14518 protected View findViewWithTagTraversal(Object tag) { 14519 if (tag != null && tag.equals(mTag)) { 14520 return this; 14521 } 14522 return null; 14523 } 14524 14525 /** 14526 * {@hide} 14527 * @param predicate The predicate to evaluate. 14528 * @param childToSkip If not null, ignores this child during the recursive traversal. 14529 * @return The first view that matches the predicate or null. 14530 */ 14531 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14532 if (predicate.apply(this)) { 14533 return this; 14534 } 14535 return null; 14536 } 14537 14538 /** 14539 * Look for a child view with the given id. If this view has the given 14540 * id, return this view. 14541 * 14542 * @param id The id to search for. 14543 * @return The view that has the given id in the hierarchy or null 14544 */ 14545 public final View findViewById(int id) { 14546 if (id < 0) { 14547 return null; 14548 } 14549 return findViewTraversal(id); 14550 } 14551 14552 /** 14553 * Finds a view by its unuque and stable accessibility id. 14554 * 14555 * @param accessibilityId The searched accessibility id. 14556 * @return The found view. 14557 */ 14558 final View findViewByAccessibilityId(int accessibilityId) { 14559 if (accessibilityId < 0) { 14560 return null; 14561 } 14562 return findViewByAccessibilityIdTraversal(accessibilityId); 14563 } 14564 14565 /** 14566 * Performs the traversal to find a view by its unuque and stable accessibility id. 14567 * 14568 * <strong>Note:</strong>This method does not stop at the root namespace 14569 * boundary since the user can touch the screen at an arbitrary location 14570 * potentially crossing the root namespace bounday which will send an 14571 * accessibility event to accessibility services and they should be able 14572 * to obtain the event source. Also accessibility ids are guaranteed to be 14573 * unique in the window. 14574 * 14575 * @param accessibilityId The accessibility id. 14576 * @return The found view. 14577 */ 14578 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14579 if (getAccessibilityViewId() == accessibilityId) { 14580 return this; 14581 } 14582 return null; 14583 } 14584 14585 /** 14586 * Look for a child view with the given tag. If this view has the given 14587 * tag, return this view. 14588 * 14589 * @param tag The tag to search for, using "tag.equals(getTag())". 14590 * @return The View that has the given tag in the hierarchy or null 14591 */ 14592 public final View findViewWithTag(Object tag) { 14593 if (tag == null) { 14594 return null; 14595 } 14596 return findViewWithTagTraversal(tag); 14597 } 14598 14599 /** 14600 * {@hide} 14601 * Look for a child view that matches the specified predicate. 14602 * If this view matches the predicate, return this view. 14603 * 14604 * @param predicate The predicate to evaluate. 14605 * @return The first view that matches the predicate or null. 14606 */ 14607 public final View findViewByPredicate(Predicate<View> predicate) { 14608 return findViewByPredicateTraversal(predicate, null); 14609 } 14610 14611 /** 14612 * {@hide} 14613 * Look for a child view that matches the specified predicate, 14614 * starting with the specified view and its descendents and then 14615 * recusively searching the ancestors and siblings of that view 14616 * until this view is reached. 14617 * 14618 * This method is useful in cases where the predicate does not match 14619 * a single unique view (perhaps multiple views use the same id) 14620 * and we are trying to find the view that is "closest" in scope to the 14621 * starting view. 14622 * 14623 * @param start The view to start from. 14624 * @param predicate The predicate to evaluate. 14625 * @return The first view that matches the predicate or null. 14626 */ 14627 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14628 View childToSkip = null; 14629 for (;;) { 14630 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14631 if (view != null || start == this) { 14632 return view; 14633 } 14634 14635 ViewParent parent = start.getParent(); 14636 if (parent == null || !(parent instanceof View)) { 14637 return null; 14638 } 14639 14640 childToSkip = start; 14641 start = (View) parent; 14642 } 14643 } 14644 14645 /** 14646 * Sets the identifier for this view. The identifier does not have to be 14647 * unique in this view's hierarchy. The identifier should be a positive 14648 * number. 14649 * 14650 * @see #NO_ID 14651 * @see #getId() 14652 * @see #findViewById(int) 14653 * 14654 * @param id a number used to identify the view 14655 * 14656 * @attr ref android.R.styleable#View_id 14657 */ 14658 public void setId(int id) { 14659 mID = id; 14660 } 14661 14662 /** 14663 * {@hide} 14664 * 14665 * @param isRoot true if the view belongs to the root namespace, false 14666 * otherwise 14667 */ 14668 public void setIsRootNamespace(boolean isRoot) { 14669 if (isRoot) { 14670 mPrivateFlags |= IS_ROOT_NAMESPACE; 14671 } else { 14672 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14673 } 14674 } 14675 14676 /** 14677 * {@hide} 14678 * 14679 * @return true if the view belongs to the root namespace, false otherwise 14680 */ 14681 public boolean isRootNamespace() { 14682 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14683 } 14684 14685 /** 14686 * Returns this view's identifier. 14687 * 14688 * @return a positive integer used to identify the view or {@link #NO_ID} 14689 * if the view has no ID 14690 * 14691 * @see #setId(int) 14692 * @see #findViewById(int) 14693 * @attr ref android.R.styleable#View_id 14694 */ 14695 @ViewDebug.CapturedViewProperty 14696 public int getId() { 14697 return mID; 14698 } 14699 14700 /** 14701 * Returns this view's tag. 14702 * 14703 * @return the Object stored in this view as a tag 14704 * 14705 * @see #setTag(Object) 14706 * @see #getTag(int) 14707 */ 14708 @ViewDebug.ExportedProperty 14709 public Object getTag() { 14710 return mTag; 14711 } 14712 14713 /** 14714 * Sets the tag associated with this view. A tag can be used to mark 14715 * a view in its hierarchy and does not have to be unique within the 14716 * hierarchy. Tags can also be used to store data within a view without 14717 * resorting to another data structure. 14718 * 14719 * @param tag an Object to tag the view with 14720 * 14721 * @see #getTag() 14722 * @see #setTag(int, Object) 14723 */ 14724 public void setTag(final Object tag) { 14725 mTag = tag; 14726 } 14727 14728 /** 14729 * Returns the tag associated with this view and the specified key. 14730 * 14731 * @param key The key identifying the tag 14732 * 14733 * @return the Object stored in this view as a tag 14734 * 14735 * @see #setTag(int, Object) 14736 * @see #getTag() 14737 */ 14738 public Object getTag(int key) { 14739 if (mKeyedTags != null) return mKeyedTags.get(key); 14740 return null; 14741 } 14742 14743 /** 14744 * Sets a tag associated with this view and a key. A tag can be used 14745 * to mark a view in its hierarchy and does not have to be unique within 14746 * the hierarchy. Tags can also be used to store data within a view 14747 * without resorting to another data structure. 14748 * 14749 * The specified key should be an id declared in the resources of the 14750 * application to ensure it is unique (see the <a 14751 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14752 * Keys identified as belonging to 14753 * the Android framework or not associated with any package will cause 14754 * an {@link IllegalArgumentException} to be thrown. 14755 * 14756 * @param key The key identifying the tag 14757 * @param tag An Object to tag the view with 14758 * 14759 * @throws IllegalArgumentException If they specified key is not valid 14760 * 14761 * @see #setTag(Object) 14762 * @see #getTag(int) 14763 */ 14764 public void setTag(int key, final Object tag) { 14765 // If the package id is 0x00 or 0x01, it's either an undefined package 14766 // or a framework id 14767 if ((key >>> 24) < 2) { 14768 throw new IllegalArgumentException("The key must be an application-specific " 14769 + "resource id."); 14770 } 14771 14772 setKeyedTag(key, tag); 14773 } 14774 14775 /** 14776 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14777 * framework id. 14778 * 14779 * @hide 14780 */ 14781 public void setTagInternal(int key, Object tag) { 14782 if ((key >>> 24) != 0x1) { 14783 throw new IllegalArgumentException("The key must be a framework-specific " 14784 + "resource id."); 14785 } 14786 14787 setKeyedTag(key, tag); 14788 } 14789 14790 private void setKeyedTag(int key, Object tag) { 14791 if (mKeyedTags == null) { 14792 mKeyedTags = new SparseArray<Object>(); 14793 } 14794 14795 mKeyedTags.put(key, tag); 14796 } 14797 14798 /** 14799 * Prints information about this view in the log output, with the tag 14800 * {@link #VIEW_LOG_TAG}. 14801 * 14802 * @hide 14803 */ 14804 public void debug() { 14805 debug(0); 14806 } 14807 14808 /** 14809 * Prints information about this view in the log output, with the tag 14810 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14811 * indentation defined by the <code>depth</code>. 14812 * 14813 * @param depth the indentation level 14814 * 14815 * @hide 14816 */ 14817 protected void debug(int depth) { 14818 String output = debugIndent(depth - 1); 14819 14820 output += "+ " + this; 14821 int id = getId(); 14822 if (id != -1) { 14823 output += " (id=" + id + ")"; 14824 } 14825 Object tag = getTag(); 14826 if (tag != null) { 14827 output += " (tag=" + tag + ")"; 14828 } 14829 Log.d(VIEW_LOG_TAG, output); 14830 14831 if ((mPrivateFlags & FOCUSED) != 0) { 14832 output = debugIndent(depth) + " FOCUSED"; 14833 Log.d(VIEW_LOG_TAG, output); 14834 } 14835 14836 output = debugIndent(depth); 14837 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14838 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14839 + "} "; 14840 Log.d(VIEW_LOG_TAG, output); 14841 14842 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14843 || mPaddingBottom != 0) { 14844 output = debugIndent(depth); 14845 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14846 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14847 Log.d(VIEW_LOG_TAG, output); 14848 } 14849 14850 output = debugIndent(depth); 14851 output += "mMeasureWidth=" + mMeasuredWidth + 14852 " mMeasureHeight=" + mMeasuredHeight; 14853 Log.d(VIEW_LOG_TAG, output); 14854 14855 output = debugIndent(depth); 14856 if (mLayoutParams == null) { 14857 output += "BAD! no layout params"; 14858 } else { 14859 output = mLayoutParams.debug(output); 14860 } 14861 Log.d(VIEW_LOG_TAG, output); 14862 14863 output = debugIndent(depth); 14864 output += "flags={"; 14865 output += View.printFlags(mViewFlags); 14866 output += "}"; 14867 Log.d(VIEW_LOG_TAG, output); 14868 14869 output = debugIndent(depth); 14870 output += "privateFlags={"; 14871 output += View.printPrivateFlags(mPrivateFlags); 14872 output += "}"; 14873 Log.d(VIEW_LOG_TAG, output); 14874 } 14875 14876 /** 14877 * Creates a string of whitespaces used for indentation. 14878 * 14879 * @param depth the indentation level 14880 * @return a String containing (depth * 2 + 3) * 2 white spaces 14881 * 14882 * @hide 14883 */ 14884 protected static String debugIndent(int depth) { 14885 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14886 for (int i = 0; i < (depth * 2) + 3; i++) { 14887 spaces.append(' ').append(' '); 14888 } 14889 return spaces.toString(); 14890 } 14891 14892 /** 14893 * <p>Return the offset of the widget's text baseline from the widget's top 14894 * boundary. If this widget does not support baseline alignment, this 14895 * method returns -1. </p> 14896 * 14897 * @return the offset of the baseline within the widget's bounds or -1 14898 * if baseline alignment is not supported 14899 */ 14900 @ViewDebug.ExportedProperty(category = "layout") 14901 public int getBaseline() { 14902 return -1; 14903 } 14904 14905 /** 14906 * Call this when something has changed which has invalidated the 14907 * layout of this view. This will schedule a layout pass of the view 14908 * tree. 14909 */ 14910 public void requestLayout() { 14911 mPrivateFlags |= FORCE_LAYOUT; 14912 mPrivateFlags |= INVALIDATED; 14913 14914 if (mLayoutParams != null) { 14915 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14916 } 14917 14918 if (mParent != null && !mParent.isLayoutRequested()) { 14919 mParent.requestLayout(); 14920 } 14921 } 14922 14923 /** 14924 * Forces this view to be laid out during the next layout pass. 14925 * This method does not call requestLayout() or forceLayout() 14926 * on the parent. 14927 */ 14928 public void forceLayout() { 14929 mPrivateFlags |= FORCE_LAYOUT; 14930 mPrivateFlags |= INVALIDATED; 14931 } 14932 14933 /** 14934 * <p> 14935 * This is called to find out how big a view should be. The parent 14936 * supplies constraint information in the width and height parameters. 14937 * </p> 14938 * 14939 * <p> 14940 * The actual measurement work of a view is performed in 14941 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14942 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14943 * </p> 14944 * 14945 * 14946 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14947 * parent 14948 * @param heightMeasureSpec Vertical space requirements as imposed by the 14949 * parent 14950 * 14951 * @see #onMeasure(int, int) 14952 */ 14953 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14954 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14955 widthMeasureSpec != mOldWidthMeasureSpec || 14956 heightMeasureSpec != mOldHeightMeasureSpec) { 14957 14958 // first clears the measured dimension flag 14959 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14960 14961 // measure ourselves, this should set the measured dimension flag back 14962 onMeasure(widthMeasureSpec, heightMeasureSpec); 14963 14964 // flag not set, setMeasuredDimension() was not invoked, we raise 14965 // an exception to warn the developer 14966 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14967 throw new IllegalStateException("onMeasure() did not set the" 14968 + " measured dimension by calling" 14969 + " setMeasuredDimension()"); 14970 } 14971 14972 mPrivateFlags |= LAYOUT_REQUIRED; 14973 } 14974 14975 mOldWidthMeasureSpec = widthMeasureSpec; 14976 mOldHeightMeasureSpec = heightMeasureSpec; 14977 } 14978 14979 /** 14980 * <p> 14981 * Measure the view and its content to determine the measured width and the 14982 * measured height. This method is invoked by {@link #measure(int, int)} and 14983 * should be overriden by subclasses to provide accurate and efficient 14984 * measurement of their contents. 14985 * </p> 14986 * 14987 * <p> 14988 * <strong>CONTRACT:</strong> When overriding this method, you 14989 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14990 * measured width and height of this view. Failure to do so will trigger an 14991 * <code>IllegalStateException</code>, thrown by 14992 * {@link #measure(int, int)}. Calling the superclass' 14993 * {@link #onMeasure(int, int)} is a valid use. 14994 * </p> 14995 * 14996 * <p> 14997 * The base class implementation of measure defaults to the background size, 14998 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14999 * override {@link #onMeasure(int, int)} to provide better measurements of 15000 * their content. 15001 * </p> 15002 * 15003 * <p> 15004 * If this method is overridden, it is the subclass's responsibility to make 15005 * sure the measured height and width are at least the view's minimum height 15006 * and width ({@link #getSuggestedMinimumHeight()} and 15007 * {@link #getSuggestedMinimumWidth()}). 15008 * </p> 15009 * 15010 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15011 * The requirements are encoded with 15012 * {@link android.view.View.MeasureSpec}. 15013 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15014 * The requirements are encoded with 15015 * {@link android.view.View.MeasureSpec}. 15016 * 15017 * @see #getMeasuredWidth() 15018 * @see #getMeasuredHeight() 15019 * @see #setMeasuredDimension(int, int) 15020 * @see #getSuggestedMinimumHeight() 15021 * @see #getSuggestedMinimumWidth() 15022 * @see android.view.View.MeasureSpec#getMode(int) 15023 * @see android.view.View.MeasureSpec#getSize(int) 15024 */ 15025 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15026 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15027 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15028 } 15029 15030 /** 15031 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15032 * measured width and measured height. Failing to do so will trigger an 15033 * exception at measurement time.</p> 15034 * 15035 * @param measuredWidth The measured width of this view. May be a complex 15036 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15037 * {@link #MEASURED_STATE_TOO_SMALL}. 15038 * @param measuredHeight The measured height of this view. May be a complex 15039 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15040 * {@link #MEASURED_STATE_TOO_SMALL}. 15041 */ 15042 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15043 mMeasuredWidth = measuredWidth; 15044 mMeasuredHeight = measuredHeight; 15045 15046 mPrivateFlags |= MEASURED_DIMENSION_SET; 15047 } 15048 15049 /** 15050 * Merge two states as returned by {@link #getMeasuredState()}. 15051 * @param curState The current state as returned from a view or the result 15052 * of combining multiple views. 15053 * @param newState The new view state to combine. 15054 * @return Returns a new integer reflecting the combination of the two 15055 * states. 15056 */ 15057 public static int combineMeasuredStates(int curState, int newState) { 15058 return curState | newState; 15059 } 15060 15061 /** 15062 * Version of {@link #resolveSizeAndState(int, int, int)} 15063 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15064 */ 15065 public static int resolveSize(int size, int measureSpec) { 15066 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15067 } 15068 15069 /** 15070 * Utility to reconcile a desired size and state, with constraints imposed 15071 * by a MeasureSpec. Will take the desired size, unless a different size 15072 * is imposed by the constraints. The returned value is a compound integer, 15073 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15074 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15075 * size is smaller than the size the view wants to be. 15076 * 15077 * @param size How big the view wants to be 15078 * @param measureSpec Constraints imposed by the parent 15079 * @return Size information bit mask as defined by 15080 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15081 */ 15082 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15083 int result = size; 15084 int specMode = MeasureSpec.getMode(measureSpec); 15085 int specSize = MeasureSpec.getSize(measureSpec); 15086 switch (specMode) { 15087 case MeasureSpec.UNSPECIFIED: 15088 result = size; 15089 break; 15090 case MeasureSpec.AT_MOST: 15091 if (specSize < size) { 15092 result = specSize | MEASURED_STATE_TOO_SMALL; 15093 } else { 15094 result = size; 15095 } 15096 break; 15097 case MeasureSpec.EXACTLY: 15098 result = specSize; 15099 break; 15100 } 15101 return result | (childMeasuredState&MEASURED_STATE_MASK); 15102 } 15103 15104 /** 15105 * Utility to return a default size. Uses the supplied size if the 15106 * MeasureSpec imposed no constraints. Will get larger if allowed 15107 * by the MeasureSpec. 15108 * 15109 * @param size Default size for this view 15110 * @param measureSpec Constraints imposed by the parent 15111 * @return The size this view should be. 15112 */ 15113 public static int getDefaultSize(int size, int measureSpec) { 15114 int result = size; 15115 int specMode = MeasureSpec.getMode(measureSpec); 15116 int specSize = MeasureSpec.getSize(measureSpec); 15117 15118 switch (specMode) { 15119 case MeasureSpec.UNSPECIFIED: 15120 result = size; 15121 break; 15122 case MeasureSpec.AT_MOST: 15123 case MeasureSpec.EXACTLY: 15124 result = specSize; 15125 break; 15126 } 15127 return result; 15128 } 15129 15130 /** 15131 * Returns the suggested minimum height that the view should use. This 15132 * returns the maximum of the view's minimum height 15133 * and the background's minimum height 15134 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15135 * <p> 15136 * When being used in {@link #onMeasure(int, int)}, the caller should still 15137 * ensure the returned height is within the requirements of the parent. 15138 * 15139 * @return The suggested minimum height of the view. 15140 */ 15141 protected int getSuggestedMinimumHeight() { 15142 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15143 15144 } 15145 15146 /** 15147 * Returns the suggested minimum width that the view should use. This 15148 * returns the maximum of the view's minimum width) 15149 * and the background's minimum width 15150 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15151 * <p> 15152 * When being used in {@link #onMeasure(int, int)}, the caller should still 15153 * ensure the returned width is within the requirements of the parent. 15154 * 15155 * @return The suggested minimum width of the view. 15156 */ 15157 protected int getSuggestedMinimumWidth() { 15158 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15159 } 15160 15161 /** 15162 * Returns the minimum height of the view. 15163 * 15164 * @return the minimum height the view will try to be. 15165 * 15166 * @see #setMinimumHeight(int) 15167 * 15168 * @attr ref android.R.styleable#View_minHeight 15169 */ 15170 public int getMinimumHeight() { 15171 return mMinHeight; 15172 } 15173 15174 /** 15175 * Sets the minimum height of the view. It is not guaranteed the view will 15176 * be able to achieve this minimum height (for example, if its parent layout 15177 * constrains it with less available height). 15178 * 15179 * @param minHeight The minimum height the view will try to be. 15180 * 15181 * @see #getMinimumHeight() 15182 * 15183 * @attr ref android.R.styleable#View_minHeight 15184 */ 15185 public void setMinimumHeight(int minHeight) { 15186 mMinHeight = minHeight; 15187 requestLayout(); 15188 } 15189 15190 /** 15191 * Returns the minimum width of the view. 15192 * 15193 * @return the minimum width the view will try to be. 15194 * 15195 * @see #setMinimumWidth(int) 15196 * 15197 * @attr ref android.R.styleable#View_minWidth 15198 */ 15199 public int getMinimumWidth() { 15200 return mMinWidth; 15201 } 15202 15203 /** 15204 * Sets the minimum width of the view. It is not guaranteed the view will 15205 * be able to achieve this minimum width (for example, if its parent layout 15206 * constrains it with less available width). 15207 * 15208 * @param minWidth The minimum width the view will try to be. 15209 * 15210 * @see #getMinimumWidth() 15211 * 15212 * @attr ref android.R.styleable#View_minWidth 15213 */ 15214 public void setMinimumWidth(int minWidth) { 15215 mMinWidth = minWidth; 15216 requestLayout(); 15217 15218 } 15219 15220 /** 15221 * Get the animation currently associated with this view. 15222 * 15223 * @return The animation that is currently playing or 15224 * scheduled to play for this view. 15225 */ 15226 public Animation getAnimation() { 15227 return mCurrentAnimation; 15228 } 15229 15230 /** 15231 * Start the specified animation now. 15232 * 15233 * @param animation the animation to start now 15234 */ 15235 public void startAnimation(Animation animation) { 15236 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15237 setAnimation(animation); 15238 invalidateParentCaches(); 15239 invalidate(true); 15240 } 15241 15242 /** 15243 * Cancels any animations for this view. 15244 */ 15245 public void clearAnimation() { 15246 if (mCurrentAnimation != null) { 15247 mCurrentAnimation.detach(); 15248 } 15249 mCurrentAnimation = null; 15250 invalidateParentIfNeeded(); 15251 } 15252 15253 /** 15254 * Sets the next animation to play for this view. 15255 * If you want the animation to play immediately, use 15256 * {@link #startAnimation(android.view.animation.Animation)} instead. 15257 * This method provides allows fine-grained 15258 * control over the start time and invalidation, but you 15259 * must make sure that 1) the animation has a start time set, and 15260 * 2) the view's parent (which controls animations on its children) 15261 * will be invalidated when the animation is supposed to 15262 * start. 15263 * 15264 * @param animation The next animation, or null. 15265 */ 15266 public void setAnimation(Animation animation) { 15267 mCurrentAnimation = animation; 15268 15269 if (animation != null) { 15270 // If the screen is off assume the animation start time is now instead of 15271 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15272 // would cause the animation to start when the screen turns back on 15273 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15274 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15275 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15276 } 15277 animation.reset(); 15278 } 15279 } 15280 15281 /** 15282 * Invoked by a parent ViewGroup to notify the start of the animation 15283 * currently associated with this view. If you override this method, 15284 * always call super.onAnimationStart(); 15285 * 15286 * @see #setAnimation(android.view.animation.Animation) 15287 * @see #getAnimation() 15288 */ 15289 protected void onAnimationStart() { 15290 mPrivateFlags |= ANIMATION_STARTED; 15291 } 15292 15293 /** 15294 * Invoked by a parent ViewGroup to notify the end of the animation 15295 * currently associated with this view. If you override this method, 15296 * always call super.onAnimationEnd(); 15297 * 15298 * @see #setAnimation(android.view.animation.Animation) 15299 * @see #getAnimation() 15300 */ 15301 protected void onAnimationEnd() { 15302 mPrivateFlags &= ~ANIMATION_STARTED; 15303 } 15304 15305 /** 15306 * Invoked if there is a Transform that involves alpha. Subclass that can 15307 * draw themselves with the specified alpha should return true, and then 15308 * respect that alpha when their onDraw() is called. If this returns false 15309 * then the view may be redirected to draw into an offscreen buffer to 15310 * fulfill the request, which will look fine, but may be slower than if the 15311 * subclass handles it internally. The default implementation returns false. 15312 * 15313 * @param alpha The alpha (0..255) to apply to the view's drawing 15314 * @return true if the view can draw with the specified alpha. 15315 */ 15316 protected boolean onSetAlpha(int alpha) { 15317 return false; 15318 } 15319 15320 /** 15321 * This is used by the RootView to perform an optimization when 15322 * the view hierarchy contains one or several SurfaceView. 15323 * SurfaceView is always considered transparent, but its children are not, 15324 * therefore all View objects remove themselves from the global transparent 15325 * region (passed as a parameter to this function). 15326 * 15327 * @param region The transparent region for this ViewAncestor (window). 15328 * 15329 * @return Returns true if the effective visibility of the view at this 15330 * point is opaque, regardless of the transparent region; returns false 15331 * if it is possible for underlying windows to be seen behind the view. 15332 * 15333 * {@hide} 15334 */ 15335 public boolean gatherTransparentRegion(Region region) { 15336 final AttachInfo attachInfo = mAttachInfo; 15337 if (region != null && attachInfo != null) { 15338 final int pflags = mPrivateFlags; 15339 if ((pflags & SKIP_DRAW) == 0) { 15340 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15341 // remove it from the transparent region. 15342 final int[] location = attachInfo.mTransparentLocation; 15343 getLocationInWindow(location); 15344 region.op(location[0], location[1], location[0] + mRight - mLeft, 15345 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15346 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15347 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15348 // exists, so we remove the background drawable's non-transparent 15349 // parts from this transparent region. 15350 applyDrawableToTransparentRegion(mBackground, region); 15351 } 15352 } 15353 return true; 15354 } 15355 15356 /** 15357 * Play a sound effect for this view. 15358 * 15359 * <p>The framework will play sound effects for some built in actions, such as 15360 * clicking, but you may wish to play these effects in your widget, 15361 * for instance, for internal navigation. 15362 * 15363 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15364 * {@link #isSoundEffectsEnabled()} is true. 15365 * 15366 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15367 */ 15368 public void playSoundEffect(int soundConstant) { 15369 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15370 return; 15371 } 15372 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15373 } 15374 15375 /** 15376 * BZZZTT!!1! 15377 * 15378 * <p>Provide haptic feedback to the user for this view. 15379 * 15380 * <p>The framework will provide haptic feedback for some built in actions, 15381 * such as long presses, but you may wish to provide feedback for your 15382 * own widget. 15383 * 15384 * <p>The feedback will only be performed if 15385 * {@link #isHapticFeedbackEnabled()} is true. 15386 * 15387 * @param feedbackConstant One of the constants defined in 15388 * {@link HapticFeedbackConstants} 15389 */ 15390 public boolean performHapticFeedback(int feedbackConstant) { 15391 return performHapticFeedback(feedbackConstant, 0); 15392 } 15393 15394 /** 15395 * BZZZTT!!1! 15396 * 15397 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15398 * 15399 * @param feedbackConstant One of the constants defined in 15400 * {@link HapticFeedbackConstants} 15401 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15402 */ 15403 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15404 if (mAttachInfo == null) { 15405 return false; 15406 } 15407 //noinspection SimplifiableIfStatement 15408 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15409 && !isHapticFeedbackEnabled()) { 15410 return false; 15411 } 15412 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15413 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15414 } 15415 15416 /** 15417 * Request that the visibility of the status bar or other screen/window 15418 * decorations be changed. 15419 * 15420 * <p>This method is used to put the over device UI into temporary modes 15421 * where the user's attention is focused more on the application content, 15422 * by dimming or hiding surrounding system affordances. This is typically 15423 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15424 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15425 * to be placed behind the action bar (and with these flags other system 15426 * affordances) so that smooth transitions between hiding and showing them 15427 * can be done. 15428 * 15429 * <p>Two representative examples of the use of system UI visibility is 15430 * implementing a content browsing application (like a magazine reader) 15431 * and a video playing application. 15432 * 15433 * <p>The first code shows a typical implementation of a View in a content 15434 * browsing application. In this implementation, the application goes 15435 * into a content-oriented mode by hiding the status bar and action bar, 15436 * and putting the navigation elements into lights out mode. The user can 15437 * then interact with content while in this mode. Such an application should 15438 * provide an easy way for the user to toggle out of the mode (such as to 15439 * check information in the status bar or access notifications). In the 15440 * implementation here, this is done simply by tapping on the content. 15441 * 15442 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15443 * content} 15444 * 15445 * <p>This second code sample shows a typical implementation of a View 15446 * in a video playing application. In this situation, while the video is 15447 * playing the application would like to go into a complete full-screen mode, 15448 * to use as much of the display as possible for the video. When in this state 15449 * the user can not interact with the application; the system intercepts 15450 * touching on the screen to pop the UI out of full screen mode. See 15451 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15452 * 15453 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15454 * content} 15455 * 15456 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15457 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15458 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15459 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15460 */ 15461 public void setSystemUiVisibility(int visibility) { 15462 if (visibility != mSystemUiVisibility) { 15463 mSystemUiVisibility = visibility; 15464 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15465 mParent.recomputeViewAttributes(this); 15466 } 15467 } 15468 } 15469 15470 /** 15471 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15472 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15473 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15474 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15475 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15476 */ 15477 public int getSystemUiVisibility() { 15478 return mSystemUiVisibility; 15479 } 15480 15481 /** 15482 * Returns the current system UI visibility that is currently set for 15483 * the entire window. This is the combination of the 15484 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15485 * views in the window. 15486 */ 15487 public int getWindowSystemUiVisibility() { 15488 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15489 } 15490 15491 /** 15492 * Override to find out when the window's requested system UI visibility 15493 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15494 * This is different from the callbacks recieved through 15495 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15496 * in that this is only telling you about the local request of the window, 15497 * not the actual values applied by the system. 15498 */ 15499 public void onWindowSystemUiVisibilityChanged(int visible) { 15500 } 15501 15502 /** 15503 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15504 * the view hierarchy. 15505 */ 15506 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15507 onWindowSystemUiVisibilityChanged(visible); 15508 } 15509 15510 /** 15511 * Set a listener to receive callbacks when the visibility of the system bar changes. 15512 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15513 */ 15514 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15515 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15516 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15517 mParent.recomputeViewAttributes(this); 15518 } 15519 } 15520 15521 /** 15522 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15523 * the view hierarchy. 15524 */ 15525 public void dispatchSystemUiVisibilityChanged(int visibility) { 15526 ListenerInfo li = mListenerInfo; 15527 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15528 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15529 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15530 } 15531 } 15532 15533 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15534 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15535 if (val != mSystemUiVisibility) { 15536 setSystemUiVisibility(val); 15537 return true; 15538 } 15539 return false; 15540 } 15541 15542 /** @hide */ 15543 public void setDisabledSystemUiVisibility(int flags) { 15544 if (mAttachInfo != null) { 15545 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15546 mAttachInfo.mDisabledSystemUiVisibility = flags; 15547 if (mParent != null) { 15548 mParent.recomputeViewAttributes(this); 15549 } 15550 } 15551 } 15552 } 15553 15554 /** 15555 * Creates an image that the system displays during the drag and drop 15556 * operation. This is called a "drag shadow". The default implementation 15557 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15558 * appearance as the given View. The default also positions the center of the drag shadow 15559 * directly under the touch point. If no View is provided (the constructor with no parameters 15560 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15561 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15562 * default is an invisible drag shadow. 15563 * <p> 15564 * You are not required to use the View you provide to the constructor as the basis of the 15565 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15566 * anything you want as the drag shadow. 15567 * </p> 15568 * <p> 15569 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15570 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15571 * size and position of the drag shadow. It uses this data to construct a 15572 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15573 * so that your application can draw the shadow image in the Canvas. 15574 * </p> 15575 * 15576 * <div class="special reference"> 15577 * <h3>Developer Guides</h3> 15578 * <p>For a guide to implementing drag and drop features, read the 15579 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15580 * </div> 15581 */ 15582 public static class DragShadowBuilder { 15583 private final WeakReference<View> mView; 15584 15585 /** 15586 * Constructs a shadow image builder based on a View. By default, the resulting drag 15587 * shadow will have the same appearance and dimensions as the View, with the touch point 15588 * over the center of the View. 15589 * @param view A View. Any View in scope can be used. 15590 */ 15591 public DragShadowBuilder(View view) { 15592 mView = new WeakReference<View>(view); 15593 } 15594 15595 /** 15596 * Construct a shadow builder object with no associated View. This 15597 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15598 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15599 * to supply the drag shadow's dimensions and appearance without 15600 * reference to any View object. If they are not overridden, then the result is an 15601 * invisible drag shadow. 15602 */ 15603 public DragShadowBuilder() { 15604 mView = new WeakReference<View>(null); 15605 } 15606 15607 /** 15608 * Returns the View object that had been passed to the 15609 * {@link #View.DragShadowBuilder(View)} 15610 * constructor. If that View parameter was {@code null} or if the 15611 * {@link #View.DragShadowBuilder()} 15612 * constructor was used to instantiate the builder object, this method will return 15613 * null. 15614 * 15615 * @return The View object associate with this builder object. 15616 */ 15617 @SuppressWarnings({"JavadocReference"}) 15618 final public View getView() { 15619 return mView.get(); 15620 } 15621 15622 /** 15623 * Provides the metrics for the shadow image. These include the dimensions of 15624 * the shadow image, and the point within that shadow that should 15625 * be centered under the touch location while dragging. 15626 * <p> 15627 * The default implementation sets the dimensions of the shadow to be the 15628 * same as the dimensions of the View itself and centers the shadow under 15629 * the touch point. 15630 * </p> 15631 * 15632 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15633 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15634 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15635 * image. 15636 * 15637 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15638 * shadow image that should be underneath the touch point during the drag and drop 15639 * operation. Your application must set {@link android.graphics.Point#x} to the 15640 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15641 */ 15642 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15643 final View view = mView.get(); 15644 if (view != null) { 15645 shadowSize.set(view.getWidth(), view.getHeight()); 15646 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15647 } else { 15648 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15649 } 15650 } 15651 15652 /** 15653 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15654 * based on the dimensions it received from the 15655 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15656 * 15657 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15658 */ 15659 public void onDrawShadow(Canvas canvas) { 15660 final View view = mView.get(); 15661 if (view != null) { 15662 view.draw(canvas); 15663 } else { 15664 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15665 } 15666 } 15667 } 15668 15669 /** 15670 * Starts a drag and drop operation. When your application calls this method, it passes a 15671 * {@link android.view.View.DragShadowBuilder} object to the system. The 15672 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15673 * to get metrics for the drag shadow, and then calls the object's 15674 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15675 * <p> 15676 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15677 * drag events to all the View objects in your application that are currently visible. It does 15678 * this either by calling the View object's drag listener (an implementation of 15679 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15680 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15681 * Both are passed a {@link android.view.DragEvent} object that has a 15682 * {@link android.view.DragEvent#getAction()} value of 15683 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15684 * </p> 15685 * <p> 15686 * Your application can invoke startDrag() on any attached View object. The View object does not 15687 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15688 * be related to the View the user selected for dragging. 15689 * </p> 15690 * @param data A {@link android.content.ClipData} object pointing to the data to be 15691 * transferred by the drag and drop operation. 15692 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15693 * drag shadow. 15694 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15695 * drop operation. This Object is put into every DragEvent object sent by the system during the 15696 * current drag. 15697 * <p> 15698 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15699 * to the target Views. For example, it can contain flags that differentiate between a 15700 * a copy operation and a move operation. 15701 * </p> 15702 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15703 * so the parameter should be set to 0. 15704 * @return {@code true} if the method completes successfully, or 15705 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15706 * do a drag, and so no drag operation is in progress. 15707 */ 15708 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15709 Object myLocalState, int flags) { 15710 if (ViewDebug.DEBUG_DRAG) { 15711 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15712 } 15713 boolean okay = false; 15714 15715 Point shadowSize = new Point(); 15716 Point shadowTouchPoint = new Point(); 15717 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15718 15719 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15720 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15721 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15722 } 15723 15724 if (ViewDebug.DEBUG_DRAG) { 15725 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15726 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15727 } 15728 Surface surface = new Surface(); 15729 try { 15730 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15731 flags, shadowSize.x, shadowSize.y, surface); 15732 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15733 + " surface=" + surface); 15734 if (token != null) { 15735 Canvas canvas = surface.lockCanvas(null); 15736 try { 15737 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15738 shadowBuilder.onDrawShadow(canvas); 15739 } finally { 15740 surface.unlockCanvasAndPost(canvas); 15741 } 15742 15743 final ViewRootImpl root = getViewRootImpl(); 15744 15745 // Cache the local state object for delivery with DragEvents 15746 root.setLocalDragState(myLocalState); 15747 15748 // repurpose 'shadowSize' for the last touch point 15749 root.getLastTouchPoint(shadowSize); 15750 15751 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15752 shadowSize.x, shadowSize.y, 15753 shadowTouchPoint.x, shadowTouchPoint.y, data); 15754 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15755 15756 // Off and running! Release our local surface instance; the drag 15757 // shadow surface is now managed by the system process. 15758 surface.release(); 15759 } 15760 } catch (Exception e) { 15761 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15762 surface.destroy(); 15763 } 15764 15765 return okay; 15766 } 15767 15768 /** 15769 * Handles drag events sent by the system following a call to 15770 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15771 *<p> 15772 * When the system calls this method, it passes a 15773 * {@link android.view.DragEvent} object. A call to 15774 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15775 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15776 * operation. 15777 * @param event The {@link android.view.DragEvent} sent by the system. 15778 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15779 * in DragEvent, indicating the type of drag event represented by this object. 15780 * @return {@code true} if the method was successful, otherwise {@code false}. 15781 * <p> 15782 * The method should return {@code true} in response to an action type of 15783 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15784 * operation. 15785 * </p> 15786 * <p> 15787 * The method should also return {@code true} in response to an action type of 15788 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15789 * {@code false} if it didn't. 15790 * </p> 15791 */ 15792 public boolean onDragEvent(DragEvent event) { 15793 return false; 15794 } 15795 15796 /** 15797 * Detects if this View is enabled and has a drag event listener. 15798 * If both are true, then it calls the drag event listener with the 15799 * {@link android.view.DragEvent} it received. If the drag event listener returns 15800 * {@code true}, then dispatchDragEvent() returns {@code true}. 15801 * <p> 15802 * For all other cases, the method calls the 15803 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15804 * method and returns its result. 15805 * </p> 15806 * <p> 15807 * This ensures that a drag event is always consumed, even if the View does not have a drag 15808 * event listener. However, if the View has a listener and the listener returns true, then 15809 * onDragEvent() is not called. 15810 * </p> 15811 */ 15812 public boolean dispatchDragEvent(DragEvent event) { 15813 //noinspection SimplifiableIfStatement 15814 ListenerInfo li = mListenerInfo; 15815 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15816 && li.mOnDragListener.onDrag(this, event)) { 15817 return true; 15818 } 15819 return onDragEvent(event); 15820 } 15821 15822 boolean canAcceptDrag() { 15823 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15824 } 15825 15826 /** 15827 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15828 * it is ever exposed at all. 15829 * @hide 15830 */ 15831 public void onCloseSystemDialogs(String reason) { 15832 } 15833 15834 /** 15835 * Given a Drawable whose bounds have been set to draw into this view, 15836 * update a Region being computed for 15837 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15838 * that any non-transparent parts of the Drawable are removed from the 15839 * given transparent region. 15840 * 15841 * @param dr The Drawable whose transparency is to be applied to the region. 15842 * @param region A Region holding the current transparency information, 15843 * where any parts of the region that are set are considered to be 15844 * transparent. On return, this region will be modified to have the 15845 * transparency information reduced by the corresponding parts of the 15846 * Drawable that are not transparent. 15847 * {@hide} 15848 */ 15849 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15850 if (DBG) { 15851 Log.i("View", "Getting transparent region for: " + this); 15852 } 15853 final Region r = dr.getTransparentRegion(); 15854 final Rect db = dr.getBounds(); 15855 final AttachInfo attachInfo = mAttachInfo; 15856 if (r != null && attachInfo != null) { 15857 final int w = getRight()-getLeft(); 15858 final int h = getBottom()-getTop(); 15859 if (db.left > 0) { 15860 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15861 r.op(0, 0, db.left, h, Region.Op.UNION); 15862 } 15863 if (db.right < w) { 15864 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15865 r.op(db.right, 0, w, h, Region.Op.UNION); 15866 } 15867 if (db.top > 0) { 15868 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15869 r.op(0, 0, w, db.top, Region.Op.UNION); 15870 } 15871 if (db.bottom < h) { 15872 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15873 r.op(0, db.bottom, w, h, Region.Op.UNION); 15874 } 15875 final int[] location = attachInfo.mTransparentLocation; 15876 getLocationInWindow(location); 15877 r.translate(location[0], location[1]); 15878 region.op(r, Region.Op.INTERSECT); 15879 } else { 15880 region.op(db, Region.Op.DIFFERENCE); 15881 } 15882 } 15883 15884 private void checkForLongClick(int delayOffset) { 15885 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15886 mHasPerformedLongPress = false; 15887 15888 if (mPendingCheckForLongPress == null) { 15889 mPendingCheckForLongPress = new CheckForLongPress(); 15890 } 15891 mPendingCheckForLongPress.rememberWindowAttachCount(); 15892 postDelayed(mPendingCheckForLongPress, 15893 ViewConfiguration.getLongPressTimeout() - delayOffset); 15894 } 15895 } 15896 15897 /** 15898 * Inflate a view from an XML resource. This convenience method wraps the {@link 15899 * LayoutInflater} class, which provides a full range of options for view inflation. 15900 * 15901 * @param context The Context object for your activity or application. 15902 * @param resource The resource ID to inflate 15903 * @param root A view group that will be the parent. Used to properly inflate the 15904 * layout_* parameters. 15905 * @see LayoutInflater 15906 */ 15907 public static View inflate(Context context, int resource, ViewGroup root) { 15908 LayoutInflater factory = LayoutInflater.from(context); 15909 return factory.inflate(resource, root); 15910 } 15911 15912 /** 15913 * Scroll the view with standard behavior for scrolling beyond the normal 15914 * content boundaries. Views that call this method should override 15915 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15916 * results of an over-scroll operation. 15917 * 15918 * Views can use this method to handle any touch or fling-based scrolling. 15919 * 15920 * @param deltaX Change in X in pixels 15921 * @param deltaY Change in Y in pixels 15922 * @param scrollX Current X scroll value in pixels before applying deltaX 15923 * @param scrollY Current Y scroll value in pixels before applying deltaY 15924 * @param scrollRangeX Maximum content scroll range along the X axis 15925 * @param scrollRangeY Maximum content scroll range along the Y axis 15926 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15927 * along the X axis. 15928 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15929 * along the Y axis. 15930 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15931 * @return true if scrolling was clamped to an over-scroll boundary along either 15932 * axis, false otherwise. 15933 */ 15934 @SuppressWarnings({"UnusedParameters"}) 15935 protected boolean overScrollBy(int deltaX, int deltaY, 15936 int scrollX, int scrollY, 15937 int scrollRangeX, int scrollRangeY, 15938 int maxOverScrollX, int maxOverScrollY, 15939 boolean isTouchEvent) { 15940 final int overScrollMode = mOverScrollMode; 15941 final boolean canScrollHorizontal = 15942 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15943 final boolean canScrollVertical = 15944 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15945 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15946 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15947 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15948 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15949 15950 int newScrollX = scrollX + deltaX; 15951 if (!overScrollHorizontal) { 15952 maxOverScrollX = 0; 15953 } 15954 15955 int newScrollY = scrollY + deltaY; 15956 if (!overScrollVertical) { 15957 maxOverScrollY = 0; 15958 } 15959 15960 // Clamp values if at the limits and record 15961 final int left = -maxOverScrollX; 15962 final int right = maxOverScrollX + scrollRangeX; 15963 final int top = -maxOverScrollY; 15964 final int bottom = maxOverScrollY + scrollRangeY; 15965 15966 boolean clampedX = false; 15967 if (newScrollX > right) { 15968 newScrollX = right; 15969 clampedX = true; 15970 } else if (newScrollX < left) { 15971 newScrollX = left; 15972 clampedX = true; 15973 } 15974 15975 boolean clampedY = false; 15976 if (newScrollY > bottom) { 15977 newScrollY = bottom; 15978 clampedY = true; 15979 } else if (newScrollY < top) { 15980 newScrollY = top; 15981 clampedY = true; 15982 } 15983 15984 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15985 15986 return clampedX || clampedY; 15987 } 15988 15989 /** 15990 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15991 * respond to the results of an over-scroll operation. 15992 * 15993 * @param scrollX New X scroll value in pixels 15994 * @param scrollY New Y scroll value in pixels 15995 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15996 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15997 */ 15998 protected void onOverScrolled(int scrollX, int scrollY, 15999 boolean clampedX, boolean clampedY) { 16000 // Intentionally empty. 16001 } 16002 16003 /** 16004 * Returns the over-scroll mode for this view. The result will be 16005 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16006 * (allow over-scrolling only if the view content is larger than the container), 16007 * or {@link #OVER_SCROLL_NEVER}. 16008 * 16009 * @return This view's over-scroll mode. 16010 */ 16011 public int getOverScrollMode() { 16012 return mOverScrollMode; 16013 } 16014 16015 /** 16016 * Set the over-scroll mode for this view. Valid over-scroll modes are 16017 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16018 * (allow over-scrolling only if the view content is larger than the container), 16019 * or {@link #OVER_SCROLL_NEVER}. 16020 * 16021 * Setting the over-scroll mode of a view will have an effect only if the 16022 * view is capable of scrolling. 16023 * 16024 * @param overScrollMode The new over-scroll mode for this view. 16025 */ 16026 public void setOverScrollMode(int overScrollMode) { 16027 if (overScrollMode != OVER_SCROLL_ALWAYS && 16028 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16029 overScrollMode != OVER_SCROLL_NEVER) { 16030 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16031 } 16032 mOverScrollMode = overScrollMode; 16033 } 16034 16035 /** 16036 * Gets a scale factor that determines the distance the view should scroll 16037 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16038 * @return The vertical scroll scale factor. 16039 * @hide 16040 */ 16041 protected float getVerticalScrollFactor() { 16042 if (mVerticalScrollFactor == 0) { 16043 TypedValue outValue = new TypedValue(); 16044 if (!mContext.getTheme().resolveAttribute( 16045 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16046 throw new IllegalStateException( 16047 "Expected theme to define listPreferredItemHeight."); 16048 } 16049 mVerticalScrollFactor = outValue.getDimension( 16050 mContext.getResources().getDisplayMetrics()); 16051 } 16052 return mVerticalScrollFactor; 16053 } 16054 16055 /** 16056 * Gets a scale factor that determines the distance the view should scroll 16057 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16058 * @return The horizontal scroll scale factor. 16059 * @hide 16060 */ 16061 protected float getHorizontalScrollFactor() { 16062 // TODO: Should use something else. 16063 return getVerticalScrollFactor(); 16064 } 16065 16066 /** 16067 * Return the value specifying the text direction or policy that was set with 16068 * {@link #setTextDirection(int)}. 16069 * 16070 * @return the defined text direction. It can be one of: 16071 * 16072 * {@link #TEXT_DIRECTION_INHERIT}, 16073 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16074 * {@link #TEXT_DIRECTION_ANY_RTL}, 16075 * {@link #TEXT_DIRECTION_LTR}, 16076 * {@link #TEXT_DIRECTION_RTL}, 16077 * {@link #TEXT_DIRECTION_LOCALE} 16078 */ 16079 @ViewDebug.ExportedProperty(category = "text", mapping = { 16080 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16081 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16082 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16083 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16084 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16085 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16086 }) 16087 public int getTextDirection() { 16088 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16089 } 16090 16091 /** 16092 * Set the text direction. 16093 * 16094 * @param textDirection the direction to set. Should be one of: 16095 * 16096 * {@link #TEXT_DIRECTION_INHERIT}, 16097 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16098 * {@link #TEXT_DIRECTION_ANY_RTL}, 16099 * {@link #TEXT_DIRECTION_LTR}, 16100 * {@link #TEXT_DIRECTION_RTL}, 16101 * {@link #TEXT_DIRECTION_LOCALE} 16102 */ 16103 public void setTextDirection(int textDirection) { 16104 if (getTextDirection() != textDirection) { 16105 // Reset the current text direction and the resolved one 16106 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16107 resetResolvedTextDirection(); 16108 // Set the new text direction 16109 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16110 // Refresh 16111 requestLayout(); 16112 invalidate(true); 16113 } 16114 } 16115 16116 /** 16117 * Return the resolved text direction. 16118 * 16119 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16120 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16121 * up the parent chain of the view. if there is no parent, then it will return the default 16122 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16123 * 16124 * @return the resolved text direction. Returns one of: 16125 * 16126 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16127 * {@link #TEXT_DIRECTION_ANY_RTL}, 16128 * {@link #TEXT_DIRECTION_LTR}, 16129 * {@link #TEXT_DIRECTION_RTL}, 16130 * {@link #TEXT_DIRECTION_LOCALE} 16131 */ 16132 public int getResolvedTextDirection() { 16133 // The text direction will be resolved only if needed 16134 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16135 resolveTextDirection(); 16136 } 16137 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16138 } 16139 16140 /** 16141 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16142 * resolution is done. 16143 */ 16144 public void resolveTextDirection() { 16145 // Reset any previous text direction resolution 16146 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16147 16148 if (hasRtlSupport()) { 16149 // Set resolved text direction flag depending on text direction flag 16150 final int textDirection = getTextDirection(); 16151 switch(textDirection) { 16152 case TEXT_DIRECTION_INHERIT: 16153 if (canResolveTextDirection()) { 16154 ViewGroup viewGroup = ((ViewGroup) mParent); 16155 16156 // Set current resolved direction to the same value as the parent's one 16157 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16158 switch (parentResolvedDirection) { 16159 case TEXT_DIRECTION_FIRST_STRONG: 16160 case TEXT_DIRECTION_ANY_RTL: 16161 case TEXT_DIRECTION_LTR: 16162 case TEXT_DIRECTION_RTL: 16163 case TEXT_DIRECTION_LOCALE: 16164 mPrivateFlags2 |= 16165 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16166 break; 16167 default: 16168 // Default resolved direction is "first strong" heuristic 16169 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16170 } 16171 } else { 16172 // We cannot do the resolution if there is no parent, so use the default one 16173 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16174 } 16175 break; 16176 case TEXT_DIRECTION_FIRST_STRONG: 16177 case TEXT_DIRECTION_ANY_RTL: 16178 case TEXT_DIRECTION_LTR: 16179 case TEXT_DIRECTION_RTL: 16180 case TEXT_DIRECTION_LOCALE: 16181 // Resolved direction is the same as text direction 16182 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16183 break; 16184 default: 16185 // Default resolved direction is "first strong" heuristic 16186 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16187 } 16188 } else { 16189 // Default resolved direction is "first strong" heuristic 16190 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16191 } 16192 16193 // Set to resolved 16194 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16195 onResolvedTextDirectionChanged(); 16196 } 16197 16198 /** 16199 * Called when text direction has been resolved. Subclasses that care about text direction 16200 * resolution should override this method. 16201 * 16202 * The default implementation does nothing. 16203 */ 16204 public void onResolvedTextDirectionChanged() { 16205 } 16206 16207 /** 16208 * Check if text direction resolution can be done. 16209 * 16210 * @return true if text direction resolution can be done otherwise return false. 16211 */ 16212 public boolean canResolveTextDirection() { 16213 switch (getTextDirection()) { 16214 case TEXT_DIRECTION_INHERIT: 16215 return (mParent != null) && (mParent instanceof ViewGroup); 16216 default: 16217 return true; 16218 } 16219 } 16220 16221 /** 16222 * Reset resolved text direction. Text direction can be resolved with a call to 16223 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16224 * reset is done. 16225 */ 16226 public void resetResolvedTextDirection() { 16227 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16228 onResolvedTextDirectionReset(); 16229 } 16230 16231 /** 16232 * Called when text direction is reset. Subclasses that care about text direction reset should 16233 * override this method and do a reset of the text direction of their children. The default 16234 * implementation does nothing. 16235 */ 16236 public void onResolvedTextDirectionReset() { 16237 } 16238 16239 /** 16240 * Return the value specifying the text alignment or policy that was set with 16241 * {@link #setTextAlignment(int)}. 16242 * 16243 * @return the defined text alignment. It can be one of: 16244 * 16245 * {@link #TEXT_ALIGNMENT_INHERIT}, 16246 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16247 * {@link #TEXT_ALIGNMENT_CENTER}, 16248 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16249 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16250 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16251 * {@link #TEXT_ALIGNMENT_VIEW_END} 16252 */ 16253 @ViewDebug.ExportedProperty(category = "text", mapping = { 16254 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16255 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16256 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16257 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16258 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16259 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16260 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16261 }) 16262 public int getTextAlignment() { 16263 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16264 } 16265 16266 /** 16267 * Set the text alignment. 16268 * 16269 * @param textAlignment The text alignment to set. Should be one of 16270 * 16271 * {@link #TEXT_ALIGNMENT_INHERIT}, 16272 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16273 * {@link #TEXT_ALIGNMENT_CENTER}, 16274 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16275 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16276 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16277 * {@link #TEXT_ALIGNMENT_VIEW_END} 16278 * 16279 * @attr ref android.R.styleable#View_textAlignment 16280 */ 16281 public void setTextAlignment(int textAlignment) { 16282 if (textAlignment != getTextAlignment()) { 16283 // Reset the current and resolved text alignment 16284 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16285 resetResolvedTextAlignment(); 16286 // Set the new text alignment 16287 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16288 // Refresh 16289 requestLayout(); 16290 invalidate(true); 16291 } 16292 } 16293 16294 /** 16295 * Return the resolved text alignment. 16296 * 16297 * The resolved text alignment. This needs resolution if the value is 16298 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16299 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16300 * 16301 * @return the resolved text alignment. Returns one of: 16302 * 16303 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16304 * {@link #TEXT_ALIGNMENT_CENTER}, 16305 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16306 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16307 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16308 * {@link #TEXT_ALIGNMENT_VIEW_END} 16309 */ 16310 @ViewDebug.ExportedProperty(category = "text", mapping = { 16311 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16312 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16313 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16314 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16315 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16316 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16317 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16318 }) 16319 public int getResolvedTextAlignment() { 16320 // If text alignment is not resolved, then resolve it 16321 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16322 resolveTextAlignment(); 16323 } 16324 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16325 } 16326 16327 /** 16328 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16329 * resolution is done. 16330 */ 16331 public void resolveTextAlignment() { 16332 // Reset any previous text alignment resolution 16333 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16334 16335 if (hasRtlSupport()) { 16336 // Set resolved text alignment flag depending on text alignment flag 16337 final int textAlignment = getTextAlignment(); 16338 switch (textAlignment) { 16339 case TEXT_ALIGNMENT_INHERIT: 16340 // Check if we can resolve the text alignment 16341 if (canResolveLayoutDirection() && mParent instanceof View) { 16342 View view = (View) mParent; 16343 16344 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16345 switch (parentResolvedTextAlignment) { 16346 case TEXT_ALIGNMENT_GRAVITY: 16347 case TEXT_ALIGNMENT_TEXT_START: 16348 case TEXT_ALIGNMENT_TEXT_END: 16349 case TEXT_ALIGNMENT_CENTER: 16350 case TEXT_ALIGNMENT_VIEW_START: 16351 case TEXT_ALIGNMENT_VIEW_END: 16352 // Resolved text alignment is the same as the parent resolved 16353 // text alignment 16354 mPrivateFlags2 |= 16355 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16356 break; 16357 default: 16358 // Use default resolved text alignment 16359 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16360 } 16361 } 16362 else { 16363 // We cannot do the resolution if there is no parent so use the default 16364 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16365 } 16366 break; 16367 case TEXT_ALIGNMENT_GRAVITY: 16368 case TEXT_ALIGNMENT_TEXT_START: 16369 case TEXT_ALIGNMENT_TEXT_END: 16370 case TEXT_ALIGNMENT_CENTER: 16371 case TEXT_ALIGNMENT_VIEW_START: 16372 case TEXT_ALIGNMENT_VIEW_END: 16373 // Resolved text alignment is the same as text alignment 16374 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16375 break; 16376 default: 16377 // Use default resolved text alignment 16378 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16379 } 16380 } else { 16381 // Use default resolved text alignment 16382 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16383 } 16384 16385 // Set the resolved 16386 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16387 onResolvedTextAlignmentChanged(); 16388 } 16389 16390 /** 16391 * Check if text alignment resolution can be done. 16392 * 16393 * @return true if text alignment resolution can be done otherwise return false. 16394 */ 16395 public boolean canResolveTextAlignment() { 16396 switch (getTextAlignment()) { 16397 case TEXT_DIRECTION_INHERIT: 16398 return (mParent != null); 16399 default: 16400 return true; 16401 } 16402 } 16403 16404 /** 16405 * Called when text alignment has been resolved. Subclasses that care about text alignment 16406 * resolution should override this method. 16407 * 16408 * The default implementation does nothing. 16409 */ 16410 public void onResolvedTextAlignmentChanged() { 16411 } 16412 16413 /** 16414 * Reset resolved text alignment. Text alignment can be resolved with a call to 16415 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16416 * reset is done. 16417 */ 16418 public void resetResolvedTextAlignment() { 16419 // Reset any previous text alignment resolution 16420 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16421 onResolvedTextAlignmentReset(); 16422 } 16423 16424 /** 16425 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16426 * override this method and do a reset of the text alignment of their children. The default 16427 * implementation does nothing. 16428 */ 16429 public void onResolvedTextAlignmentReset() { 16430 } 16431 16432 /** 16433 * Generate a value suitable for use in {@link #setId(int)}. 16434 * This value will not collide with ID values generated at build time by aapt for R.id. 16435 * 16436 * @return a generated ID value 16437 */ 16438 public static int generateViewId() { 16439 for (;;) { 16440 final int result = sNextGeneratedId.get(); 16441 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 16442 int newValue = result + 1; 16443 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 16444 if (sNextGeneratedId.compareAndSet(result, newValue)) { 16445 return result; 16446 } 16447 } 16448 } 16449 16450 // 16451 // Properties 16452 // 16453 /** 16454 * A Property wrapper around the <code>alpha</code> functionality handled by the 16455 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16456 */ 16457 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16458 @Override 16459 public void setValue(View object, float value) { 16460 object.setAlpha(value); 16461 } 16462 16463 @Override 16464 public Float get(View object) { 16465 return object.getAlpha(); 16466 } 16467 }; 16468 16469 /** 16470 * A Property wrapper around the <code>translationX</code> functionality handled by the 16471 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16472 */ 16473 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16474 @Override 16475 public void setValue(View object, float value) { 16476 object.setTranslationX(value); 16477 } 16478 16479 @Override 16480 public Float get(View object) { 16481 return object.getTranslationX(); 16482 } 16483 }; 16484 16485 /** 16486 * A Property wrapper around the <code>translationY</code> functionality handled by the 16487 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16488 */ 16489 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16490 @Override 16491 public void setValue(View object, float value) { 16492 object.setTranslationY(value); 16493 } 16494 16495 @Override 16496 public Float get(View object) { 16497 return object.getTranslationY(); 16498 } 16499 }; 16500 16501 /** 16502 * A Property wrapper around the <code>x</code> functionality handled by the 16503 * {@link View#setX(float)} and {@link View#getX()} methods. 16504 */ 16505 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16506 @Override 16507 public void setValue(View object, float value) { 16508 object.setX(value); 16509 } 16510 16511 @Override 16512 public Float get(View object) { 16513 return object.getX(); 16514 } 16515 }; 16516 16517 /** 16518 * A Property wrapper around the <code>y</code> functionality handled by the 16519 * {@link View#setY(float)} and {@link View#getY()} methods. 16520 */ 16521 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16522 @Override 16523 public void setValue(View object, float value) { 16524 object.setY(value); 16525 } 16526 16527 @Override 16528 public Float get(View object) { 16529 return object.getY(); 16530 } 16531 }; 16532 16533 /** 16534 * A Property wrapper around the <code>rotation</code> functionality handled by the 16535 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16536 */ 16537 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16538 @Override 16539 public void setValue(View object, float value) { 16540 object.setRotation(value); 16541 } 16542 16543 @Override 16544 public Float get(View object) { 16545 return object.getRotation(); 16546 } 16547 }; 16548 16549 /** 16550 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16551 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16552 */ 16553 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16554 @Override 16555 public void setValue(View object, float value) { 16556 object.setRotationX(value); 16557 } 16558 16559 @Override 16560 public Float get(View object) { 16561 return object.getRotationX(); 16562 } 16563 }; 16564 16565 /** 16566 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16567 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16568 */ 16569 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16570 @Override 16571 public void setValue(View object, float value) { 16572 object.setRotationY(value); 16573 } 16574 16575 @Override 16576 public Float get(View object) { 16577 return object.getRotationY(); 16578 } 16579 }; 16580 16581 /** 16582 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16583 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16584 */ 16585 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16586 @Override 16587 public void setValue(View object, float value) { 16588 object.setScaleX(value); 16589 } 16590 16591 @Override 16592 public Float get(View object) { 16593 return object.getScaleX(); 16594 } 16595 }; 16596 16597 /** 16598 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16599 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16600 */ 16601 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16602 @Override 16603 public void setValue(View object, float value) { 16604 object.setScaleY(value); 16605 } 16606 16607 @Override 16608 public Float get(View object) { 16609 return object.getScaleY(); 16610 } 16611 }; 16612 16613 /** 16614 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16615 * Each MeasureSpec represents a requirement for either the width or the height. 16616 * A MeasureSpec is comprised of a size and a mode. There are three possible 16617 * modes: 16618 * <dl> 16619 * <dt>UNSPECIFIED</dt> 16620 * <dd> 16621 * The parent has not imposed any constraint on the child. It can be whatever size 16622 * it wants. 16623 * </dd> 16624 * 16625 * <dt>EXACTLY</dt> 16626 * <dd> 16627 * The parent has determined an exact size for the child. The child is going to be 16628 * given those bounds regardless of how big it wants to be. 16629 * </dd> 16630 * 16631 * <dt>AT_MOST</dt> 16632 * <dd> 16633 * The child can be as large as it wants up to the specified size. 16634 * </dd> 16635 * </dl> 16636 * 16637 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16638 * is provided to pack and unpack the <size, mode> tuple into the int. 16639 */ 16640 public static class MeasureSpec { 16641 private static final int MODE_SHIFT = 30; 16642 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16643 16644 /** 16645 * Measure specification mode: The parent has not imposed any constraint 16646 * on the child. It can be whatever size it wants. 16647 */ 16648 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16649 16650 /** 16651 * Measure specification mode: The parent has determined an exact size 16652 * for the child. The child is going to be given those bounds regardless 16653 * of how big it wants to be. 16654 */ 16655 public static final int EXACTLY = 1 << MODE_SHIFT; 16656 16657 /** 16658 * Measure specification mode: The child can be as large as it wants up 16659 * to the specified size. 16660 */ 16661 public static final int AT_MOST = 2 << MODE_SHIFT; 16662 16663 /** 16664 * Creates a measure specification based on the supplied size and mode. 16665 * 16666 * The mode must always be one of the following: 16667 * <ul> 16668 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16669 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16670 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16671 * </ul> 16672 * 16673 * @param size the size of the measure specification 16674 * @param mode the mode of the measure specification 16675 * @return the measure specification based on size and mode 16676 */ 16677 public static int makeMeasureSpec(int size, int mode) { 16678 return size + mode; 16679 } 16680 16681 /** 16682 * Extracts the mode from the supplied measure specification. 16683 * 16684 * @param measureSpec the measure specification to extract the mode from 16685 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16686 * {@link android.view.View.MeasureSpec#AT_MOST} or 16687 * {@link android.view.View.MeasureSpec#EXACTLY} 16688 */ 16689 public static int getMode(int measureSpec) { 16690 return (measureSpec & MODE_MASK); 16691 } 16692 16693 /** 16694 * Extracts the size from the supplied measure specification. 16695 * 16696 * @param measureSpec the measure specification to extract the size from 16697 * @return the size in pixels defined in the supplied measure specification 16698 */ 16699 public static int getSize(int measureSpec) { 16700 return (measureSpec & ~MODE_MASK); 16701 } 16702 16703 /** 16704 * Returns a String representation of the specified measure 16705 * specification. 16706 * 16707 * @param measureSpec the measure specification to convert to a String 16708 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16709 */ 16710 public static String toString(int measureSpec) { 16711 int mode = getMode(measureSpec); 16712 int size = getSize(measureSpec); 16713 16714 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16715 16716 if (mode == UNSPECIFIED) 16717 sb.append("UNSPECIFIED "); 16718 else if (mode == EXACTLY) 16719 sb.append("EXACTLY "); 16720 else if (mode == AT_MOST) 16721 sb.append("AT_MOST "); 16722 else 16723 sb.append(mode).append(" "); 16724 16725 sb.append(size); 16726 return sb.toString(); 16727 } 16728 } 16729 16730 class CheckForLongPress implements Runnable { 16731 16732 private int mOriginalWindowAttachCount; 16733 16734 public void run() { 16735 if (isPressed() && (mParent != null) 16736 && mOriginalWindowAttachCount == mWindowAttachCount) { 16737 if (performLongClick()) { 16738 mHasPerformedLongPress = true; 16739 } 16740 } 16741 } 16742 16743 public void rememberWindowAttachCount() { 16744 mOriginalWindowAttachCount = mWindowAttachCount; 16745 } 16746 } 16747 16748 private final class CheckForTap implements Runnable { 16749 public void run() { 16750 mPrivateFlags &= ~PREPRESSED; 16751 setPressed(true); 16752 checkForLongClick(ViewConfiguration.getTapTimeout()); 16753 } 16754 } 16755 16756 private final class PerformClick implements Runnable { 16757 public void run() { 16758 performClick(); 16759 } 16760 } 16761 16762 /** @hide */ 16763 public void hackTurnOffWindowResizeAnim(boolean off) { 16764 mAttachInfo.mTurnOffWindowResizeAnim = off; 16765 } 16766 16767 /** 16768 * This method returns a ViewPropertyAnimator object, which can be used to animate 16769 * specific properties on this View. 16770 * 16771 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16772 */ 16773 public ViewPropertyAnimator animate() { 16774 if (mAnimator == null) { 16775 mAnimator = new ViewPropertyAnimator(this); 16776 } 16777 return mAnimator; 16778 } 16779 16780 /** 16781 * Interface definition for a callback to be invoked when a hardware key event is 16782 * dispatched to this view. The callback will be invoked before the key event is 16783 * given to the view. This is only useful for hardware keyboards; a software input 16784 * method has no obligation to trigger this listener. 16785 */ 16786 public interface OnKeyListener { 16787 /** 16788 * Called when a hardware key is dispatched to a view. This allows listeners to 16789 * get a chance to respond before the target view. 16790 * <p>Key presses in software keyboards will generally NOT trigger this method, 16791 * although some may elect to do so in some situations. Do not assume a 16792 * software input method has to be key-based; even if it is, it may use key presses 16793 * in a different way than you expect, so there is no way to reliably catch soft 16794 * input key presses. 16795 * 16796 * @param v The view the key has been dispatched to. 16797 * @param keyCode The code for the physical key that was pressed 16798 * @param event The KeyEvent object containing full information about 16799 * the event. 16800 * @return True if the listener has consumed the event, false otherwise. 16801 */ 16802 boolean onKey(View v, int keyCode, KeyEvent event); 16803 } 16804 16805 /** 16806 * Interface definition for a callback to be invoked when a touch event is 16807 * dispatched to this view. The callback will be invoked before the touch 16808 * event is given to the view. 16809 */ 16810 public interface OnTouchListener { 16811 /** 16812 * Called when a touch event is dispatched to a view. This allows listeners to 16813 * get a chance to respond before the target view. 16814 * 16815 * @param v The view the touch event has been dispatched to. 16816 * @param event The MotionEvent object containing full information about 16817 * the event. 16818 * @return True if the listener has consumed the event, false otherwise. 16819 */ 16820 boolean onTouch(View v, MotionEvent event); 16821 } 16822 16823 /** 16824 * Interface definition for a callback to be invoked when a hover event is 16825 * dispatched to this view. The callback will be invoked before the hover 16826 * event is given to the view. 16827 */ 16828 public interface OnHoverListener { 16829 /** 16830 * Called when a hover event is dispatched to a view. This allows listeners to 16831 * get a chance to respond before the target view. 16832 * 16833 * @param v The view the hover event has been dispatched to. 16834 * @param event The MotionEvent object containing full information about 16835 * the event. 16836 * @return True if the listener has consumed the event, false otherwise. 16837 */ 16838 boolean onHover(View v, MotionEvent event); 16839 } 16840 16841 /** 16842 * Interface definition for a callback to be invoked when a generic motion event is 16843 * dispatched to this view. The callback will be invoked before the generic motion 16844 * event is given to the view. 16845 */ 16846 public interface OnGenericMotionListener { 16847 /** 16848 * Called when a generic motion event is dispatched to a view. This allows listeners to 16849 * get a chance to respond before the target view. 16850 * 16851 * @param v The view the generic motion event has been dispatched to. 16852 * @param event The MotionEvent object containing full information about 16853 * the event. 16854 * @return True if the listener has consumed the event, false otherwise. 16855 */ 16856 boolean onGenericMotion(View v, MotionEvent event); 16857 } 16858 16859 /** 16860 * Interface definition for a callback to be invoked when a view has been clicked and held. 16861 */ 16862 public interface OnLongClickListener { 16863 /** 16864 * Called when a view has been clicked and held. 16865 * 16866 * @param v The view that was clicked and held. 16867 * 16868 * @return true if the callback consumed the long click, false otherwise. 16869 */ 16870 boolean onLongClick(View v); 16871 } 16872 16873 /** 16874 * Interface definition for a callback to be invoked when a drag is being dispatched 16875 * to this view. The callback will be invoked before the hosting view's own 16876 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16877 * onDrag(event) behavior, it should return 'false' from this callback. 16878 * 16879 * <div class="special reference"> 16880 * <h3>Developer Guides</h3> 16881 * <p>For a guide to implementing drag and drop features, read the 16882 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16883 * </div> 16884 */ 16885 public interface OnDragListener { 16886 /** 16887 * Called when a drag event is dispatched to a view. This allows listeners 16888 * to get a chance to override base View behavior. 16889 * 16890 * @param v The View that received the drag event. 16891 * @param event The {@link android.view.DragEvent} object for the drag event. 16892 * @return {@code true} if the drag event was handled successfully, or {@code false} 16893 * if the drag event was not handled. Note that {@code false} will trigger the View 16894 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16895 */ 16896 boolean onDrag(View v, DragEvent event); 16897 } 16898 16899 /** 16900 * Interface definition for a callback to be invoked when the focus state of 16901 * a view changed. 16902 */ 16903 public interface OnFocusChangeListener { 16904 /** 16905 * Called when the focus state of a view has changed. 16906 * 16907 * @param v The view whose state has changed. 16908 * @param hasFocus The new focus state of v. 16909 */ 16910 void onFocusChange(View v, boolean hasFocus); 16911 } 16912 16913 /** 16914 * Interface definition for a callback to be invoked when a view is clicked. 16915 */ 16916 public interface OnClickListener { 16917 /** 16918 * Called when a view has been clicked. 16919 * 16920 * @param v The view that was clicked. 16921 */ 16922 void onClick(View v); 16923 } 16924 16925 /** 16926 * Interface definition for a callback to be invoked when the context menu 16927 * for this view is being built. 16928 */ 16929 public interface OnCreateContextMenuListener { 16930 /** 16931 * Called when the context menu for this view is being built. It is not 16932 * safe to hold onto the menu after this method returns. 16933 * 16934 * @param menu The context menu that is being built 16935 * @param v The view for which the context menu is being built 16936 * @param menuInfo Extra information about the item for which the 16937 * context menu should be shown. This information will vary 16938 * depending on the class of v. 16939 */ 16940 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16941 } 16942 16943 /** 16944 * Interface definition for a callback to be invoked when the status bar changes 16945 * visibility. This reports <strong>global</strong> changes to the system UI 16946 * state, not what the application is requesting. 16947 * 16948 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16949 */ 16950 public interface OnSystemUiVisibilityChangeListener { 16951 /** 16952 * Called when the status bar changes visibility because of a call to 16953 * {@link View#setSystemUiVisibility(int)}. 16954 * 16955 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16956 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 16957 * This tells you the <strong>global</strong> state of these UI visibility 16958 * flags, not what your app is currently applying. 16959 */ 16960 public void onSystemUiVisibilityChange(int visibility); 16961 } 16962 16963 /** 16964 * Interface definition for a callback to be invoked when this view is attached 16965 * or detached from its window. 16966 */ 16967 public interface OnAttachStateChangeListener { 16968 /** 16969 * Called when the view is attached to a window. 16970 * @param v The view that was attached 16971 */ 16972 public void onViewAttachedToWindow(View v); 16973 /** 16974 * Called when the view is detached from a window. 16975 * @param v The view that was detached 16976 */ 16977 public void onViewDetachedFromWindow(View v); 16978 } 16979 16980 private final class UnsetPressedState implements Runnable { 16981 public void run() { 16982 setPressed(false); 16983 } 16984 } 16985 16986 /** 16987 * Base class for derived classes that want to save and restore their own 16988 * state in {@link android.view.View#onSaveInstanceState()}. 16989 */ 16990 public static class BaseSavedState extends AbsSavedState { 16991 /** 16992 * Constructor used when reading from a parcel. Reads the state of the superclass. 16993 * 16994 * @param source 16995 */ 16996 public BaseSavedState(Parcel source) { 16997 super(source); 16998 } 16999 17000 /** 17001 * Constructor called by derived classes when creating their SavedState objects 17002 * 17003 * @param superState The state of the superclass of this view 17004 */ 17005 public BaseSavedState(Parcelable superState) { 17006 super(superState); 17007 } 17008 17009 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17010 new Parcelable.Creator<BaseSavedState>() { 17011 public BaseSavedState createFromParcel(Parcel in) { 17012 return new BaseSavedState(in); 17013 } 17014 17015 public BaseSavedState[] newArray(int size) { 17016 return new BaseSavedState[size]; 17017 } 17018 }; 17019 } 17020 17021 /** 17022 * A set of information given to a view when it is attached to its parent 17023 * window. 17024 */ 17025 static class AttachInfo { 17026 interface Callbacks { 17027 void playSoundEffect(int effectId); 17028 boolean performHapticFeedback(int effectId, boolean always); 17029 } 17030 17031 /** 17032 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17033 * to a Handler. This class contains the target (View) to invalidate and 17034 * the coordinates of the dirty rectangle. 17035 * 17036 * For performance purposes, this class also implements a pool of up to 17037 * POOL_LIMIT objects that get reused. This reduces memory allocations 17038 * whenever possible. 17039 */ 17040 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17041 private static final int POOL_LIMIT = 10; 17042 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17043 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17044 public InvalidateInfo newInstance() { 17045 return new InvalidateInfo(); 17046 } 17047 17048 public void onAcquired(InvalidateInfo element) { 17049 } 17050 17051 public void onReleased(InvalidateInfo element) { 17052 element.target = null; 17053 } 17054 }, POOL_LIMIT) 17055 ); 17056 17057 private InvalidateInfo mNext; 17058 private boolean mIsPooled; 17059 17060 View target; 17061 17062 int left; 17063 int top; 17064 int right; 17065 int bottom; 17066 17067 public void setNextPoolable(InvalidateInfo element) { 17068 mNext = element; 17069 } 17070 17071 public InvalidateInfo getNextPoolable() { 17072 return mNext; 17073 } 17074 17075 static InvalidateInfo acquire() { 17076 return sPool.acquire(); 17077 } 17078 17079 void release() { 17080 sPool.release(this); 17081 } 17082 17083 public boolean isPooled() { 17084 return mIsPooled; 17085 } 17086 17087 public void setPooled(boolean isPooled) { 17088 mIsPooled = isPooled; 17089 } 17090 } 17091 17092 final IWindowSession mSession; 17093 17094 final IWindow mWindow; 17095 17096 final IBinder mWindowToken; 17097 17098 final Callbacks mRootCallbacks; 17099 17100 HardwareCanvas mHardwareCanvas; 17101 17102 /** 17103 * The top view of the hierarchy. 17104 */ 17105 View mRootView; 17106 17107 IBinder mPanelParentWindowToken; 17108 Surface mSurface; 17109 17110 boolean mHardwareAccelerated; 17111 boolean mHardwareAccelerationRequested; 17112 HardwareRenderer mHardwareRenderer; 17113 17114 boolean mScreenOn; 17115 17116 /** 17117 * Scale factor used by the compatibility mode 17118 */ 17119 float mApplicationScale; 17120 17121 /** 17122 * Indicates whether the application is in compatibility mode 17123 */ 17124 boolean mScalingRequired; 17125 17126 /** 17127 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17128 */ 17129 boolean mTurnOffWindowResizeAnim; 17130 17131 /** 17132 * Left position of this view's window 17133 */ 17134 int mWindowLeft; 17135 17136 /** 17137 * Top position of this view's window 17138 */ 17139 int mWindowTop; 17140 17141 /** 17142 * Indicates whether views need to use 32-bit drawing caches 17143 */ 17144 boolean mUse32BitDrawingCache; 17145 17146 /** 17147 * For windows that are full-screen but using insets to layout inside 17148 * of the screen decorations, these are the current insets for the 17149 * content of the window. 17150 */ 17151 final Rect mContentInsets = new Rect(); 17152 17153 /** 17154 * For windows that are full-screen but using insets to layout inside 17155 * of the screen decorations, these are the current insets for the 17156 * actual visible parts of the window. 17157 */ 17158 final Rect mVisibleInsets = new Rect(); 17159 17160 /** 17161 * The internal insets given by this window. This value is 17162 * supplied by the client (through 17163 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17164 * be given to the window manager when changed to be used in laying 17165 * out windows behind it. 17166 */ 17167 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17168 = new ViewTreeObserver.InternalInsetsInfo(); 17169 17170 /** 17171 * All views in the window's hierarchy that serve as scroll containers, 17172 * used to determine if the window can be resized or must be panned 17173 * to adjust for a soft input area. 17174 */ 17175 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17176 17177 final KeyEvent.DispatcherState mKeyDispatchState 17178 = new KeyEvent.DispatcherState(); 17179 17180 /** 17181 * Indicates whether the view's window currently has the focus. 17182 */ 17183 boolean mHasWindowFocus; 17184 17185 /** 17186 * The current visibility of the window. 17187 */ 17188 int mWindowVisibility; 17189 17190 /** 17191 * Indicates the time at which drawing started to occur. 17192 */ 17193 long mDrawingTime; 17194 17195 /** 17196 * Indicates whether or not ignoring the DIRTY_MASK flags. 17197 */ 17198 boolean mIgnoreDirtyState; 17199 17200 /** 17201 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17202 * to avoid clearing that flag prematurely. 17203 */ 17204 boolean mSetIgnoreDirtyState = false; 17205 17206 /** 17207 * Indicates whether the view's window is currently in touch mode. 17208 */ 17209 boolean mInTouchMode; 17210 17211 /** 17212 * Indicates that ViewAncestor should trigger a global layout change 17213 * the next time it performs a traversal 17214 */ 17215 boolean mRecomputeGlobalAttributes; 17216 17217 /** 17218 * Always report new attributes at next traversal. 17219 */ 17220 boolean mForceReportNewAttributes; 17221 17222 /** 17223 * Set during a traveral if any views want to keep the screen on. 17224 */ 17225 boolean mKeepScreenOn; 17226 17227 /** 17228 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17229 */ 17230 int mSystemUiVisibility; 17231 17232 /** 17233 * Hack to force certain system UI visibility flags to be cleared. 17234 */ 17235 int mDisabledSystemUiVisibility; 17236 17237 /** 17238 * Last global system UI visibility reported by the window manager. 17239 */ 17240 int mGlobalSystemUiVisibility; 17241 17242 /** 17243 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17244 * attached. 17245 */ 17246 boolean mHasSystemUiListeners; 17247 17248 /** 17249 * Set if the visibility of any views has changed. 17250 */ 17251 boolean mViewVisibilityChanged; 17252 17253 /** 17254 * Set to true if a view has been scrolled. 17255 */ 17256 boolean mViewScrollChanged; 17257 17258 /** 17259 * Global to the view hierarchy used as a temporary for dealing with 17260 * x/y points in the transparent region computations. 17261 */ 17262 final int[] mTransparentLocation = new int[2]; 17263 17264 /** 17265 * Global to the view hierarchy used as a temporary for dealing with 17266 * x/y points in the ViewGroup.invalidateChild implementation. 17267 */ 17268 final int[] mInvalidateChildLocation = new int[2]; 17269 17270 17271 /** 17272 * Global to the view hierarchy used as a temporary for dealing with 17273 * x/y location when view is transformed. 17274 */ 17275 final float[] mTmpTransformLocation = new float[2]; 17276 17277 /** 17278 * The view tree observer used to dispatch global events like 17279 * layout, pre-draw, touch mode change, etc. 17280 */ 17281 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17282 17283 /** 17284 * A Canvas used by the view hierarchy to perform bitmap caching. 17285 */ 17286 Canvas mCanvas; 17287 17288 /** 17289 * The view root impl. 17290 */ 17291 final ViewRootImpl mViewRootImpl; 17292 17293 /** 17294 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17295 * handler can be used to pump events in the UI events queue. 17296 */ 17297 final Handler mHandler; 17298 17299 /** 17300 * Temporary for use in computing invalidate rectangles while 17301 * calling up the hierarchy. 17302 */ 17303 final Rect mTmpInvalRect = new Rect(); 17304 17305 /** 17306 * Temporary for use in computing hit areas with transformed views 17307 */ 17308 final RectF mTmpTransformRect = new RectF(); 17309 17310 /** 17311 * Temporary list for use in collecting focusable descendents of a view. 17312 */ 17313 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17314 17315 /** 17316 * The id of the window for accessibility purposes. 17317 */ 17318 int mAccessibilityWindowId = View.NO_ID; 17319 17320 /** 17321 * Whether to ingore not exposed for accessibility Views when 17322 * reporting the view tree to accessibility services. 17323 */ 17324 boolean mIncludeNotImportantViews; 17325 17326 /** 17327 * The drawable for highlighting accessibility focus. 17328 */ 17329 Drawable mAccessibilityFocusDrawable; 17330 17331 /** 17332 * Show where the margins, bounds and layout bounds are for each view. 17333 */ 17334 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17335 17336 /** 17337 * Point used to compute visible regions. 17338 */ 17339 final Point mPoint = new Point(); 17340 17341 /** 17342 * Creates a new set of attachment information with the specified 17343 * events handler and thread. 17344 * 17345 * @param handler the events handler the view must use 17346 */ 17347 AttachInfo(IWindowSession session, IWindow window, 17348 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17349 mSession = session; 17350 mWindow = window; 17351 mWindowToken = window.asBinder(); 17352 mViewRootImpl = viewRootImpl; 17353 mHandler = handler; 17354 mRootCallbacks = effectPlayer; 17355 } 17356 } 17357 17358 /** 17359 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17360 * is supported. This avoids keeping too many unused fields in most 17361 * instances of View.</p> 17362 */ 17363 private static class ScrollabilityCache implements Runnable { 17364 17365 /** 17366 * Scrollbars are not visible 17367 */ 17368 public static final int OFF = 0; 17369 17370 /** 17371 * Scrollbars are visible 17372 */ 17373 public static final int ON = 1; 17374 17375 /** 17376 * Scrollbars are fading away 17377 */ 17378 public static final int FADING = 2; 17379 17380 public boolean fadeScrollBars; 17381 17382 public int fadingEdgeLength; 17383 public int scrollBarDefaultDelayBeforeFade; 17384 public int scrollBarFadeDuration; 17385 17386 public int scrollBarSize; 17387 public ScrollBarDrawable scrollBar; 17388 public float[] interpolatorValues; 17389 public View host; 17390 17391 public final Paint paint; 17392 public final Matrix matrix; 17393 public Shader shader; 17394 17395 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17396 17397 private static final float[] OPAQUE = { 255 }; 17398 private static final float[] TRANSPARENT = { 0.0f }; 17399 17400 /** 17401 * When fading should start. This time moves into the future every time 17402 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17403 */ 17404 public long fadeStartTime; 17405 17406 17407 /** 17408 * The current state of the scrollbars: ON, OFF, or FADING 17409 */ 17410 public int state = OFF; 17411 17412 private int mLastColor; 17413 17414 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17415 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17416 scrollBarSize = configuration.getScaledScrollBarSize(); 17417 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17418 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17419 17420 paint = new Paint(); 17421 matrix = new Matrix(); 17422 // use use a height of 1, and then wack the matrix each time we 17423 // actually use it. 17424 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17425 17426 paint.setShader(shader); 17427 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17428 this.host = host; 17429 } 17430 17431 public void setFadeColor(int color) { 17432 if (color != 0 && color != mLastColor) { 17433 mLastColor = color; 17434 color |= 0xFF000000; 17435 17436 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17437 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17438 17439 paint.setShader(shader); 17440 // Restore the default transfer mode (src_over) 17441 paint.setXfermode(null); 17442 } 17443 } 17444 17445 public void run() { 17446 long now = AnimationUtils.currentAnimationTimeMillis(); 17447 if (now >= fadeStartTime) { 17448 17449 // the animation fades the scrollbars out by changing 17450 // the opacity (alpha) from fully opaque to fully 17451 // transparent 17452 int nextFrame = (int) now; 17453 int framesCount = 0; 17454 17455 Interpolator interpolator = scrollBarInterpolator; 17456 17457 // Start opaque 17458 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17459 17460 // End transparent 17461 nextFrame += scrollBarFadeDuration; 17462 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17463 17464 state = FADING; 17465 17466 // Kick off the fade animation 17467 host.invalidate(true); 17468 } 17469 } 17470 } 17471 17472 /** 17473 * Resuable callback for sending 17474 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17475 */ 17476 private class SendViewScrolledAccessibilityEvent implements Runnable { 17477 public volatile boolean mIsPending; 17478 17479 public void run() { 17480 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17481 mIsPending = false; 17482 } 17483 } 17484 17485 /** 17486 * <p> 17487 * This class represents a delegate that can be registered in a {@link View} 17488 * to enhance accessibility support via composition rather via inheritance. 17489 * It is specifically targeted to widget developers that extend basic View 17490 * classes i.e. classes in package android.view, that would like their 17491 * applications to be backwards compatible. 17492 * </p> 17493 * <div class="special reference"> 17494 * <h3>Developer Guides</h3> 17495 * <p>For more information about making applications accessible, read the 17496 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17497 * developer guide.</p> 17498 * </div> 17499 * <p> 17500 * A scenario in which a developer would like to use an accessibility delegate 17501 * is overriding a method introduced in a later API version then the minimal API 17502 * version supported by the application. For example, the method 17503 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17504 * in API version 4 when the accessibility APIs were first introduced. If a 17505 * developer would like his application to run on API version 4 devices (assuming 17506 * all other APIs used by the application are version 4 or lower) and take advantage 17507 * of this method, instead of overriding the method which would break the application's 17508 * backwards compatibility, he can override the corresponding method in this 17509 * delegate and register the delegate in the target View if the API version of 17510 * the system is high enough i.e. the API version is same or higher to the API 17511 * version that introduced 17512 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17513 * </p> 17514 * <p> 17515 * Here is an example implementation: 17516 * </p> 17517 * <code><pre><p> 17518 * if (Build.VERSION.SDK_INT >= 14) { 17519 * // If the API version is equal of higher than the version in 17520 * // which onInitializeAccessibilityNodeInfo was introduced we 17521 * // register a delegate with a customized implementation. 17522 * View view = findViewById(R.id.view_id); 17523 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17524 * public void onInitializeAccessibilityNodeInfo(View host, 17525 * AccessibilityNodeInfo info) { 17526 * // Let the default implementation populate the info. 17527 * super.onInitializeAccessibilityNodeInfo(host, info); 17528 * // Set some other information. 17529 * info.setEnabled(host.isEnabled()); 17530 * } 17531 * }); 17532 * } 17533 * </code></pre></p> 17534 * <p> 17535 * This delegate contains methods that correspond to the accessibility methods 17536 * in View. If a delegate has been specified the implementation in View hands 17537 * off handling to the corresponding method in this delegate. The default 17538 * implementation the delegate methods behaves exactly as the corresponding 17539 * method in View for the case of no accessibility delegate been set. Hence, 17540 * to customize the behavior of a View method, clients can override only the 17541 * corresponding delegate method without altering the behavior of the rest 17542 * accessibility related methods of the host view. 17543 * </p> 17544 */ 17545 public static class AccessibilityDelegate { 17546 17547 /** 17548 * Sends an accessibility event of the given type. If accessibility is not 17549 * enabled this method has no effect. 17550 * <p> 17551 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17552 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17553 * been set. 17554 * </p> 17555 * 17556 * @param host The View hosting the delegate. 17557 * @param eventType The type of the event to send. 17558 * 17559 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17560 */ 17561 public void sendAccessibilityEvent(View host, int eventType) { 17562 host.sendAccessibilityEventInternal(eventType); 17563 } 17564 17565 /** 17566 * Performs the specified accessibility action on the view. For 17567 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17568 * <p> 17569 * The default implementation behaves as 17570 * {@link View#performAccessibilityAction(int, Bundle) 17571 * View#performAccessibilityAction(int, Bundle)} for the case of 17572 * no accessibility delegate been set. 17573 * </p> 17574 * 17575 * @param action The action to perform. 17576 * @return Whether the action was performed. 17577 * 17578 * @see View#performAccessibilityAction(int, Bundle) 17579 * View#performAccessibilityAction(int, Bundle) 17580 */ 17581 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17582 return host.performAccessibilityActionInternal(action, args); 17583 } 17584 17585 /** 17586 * Sends an accessibility event. This method behaves exactly as 17587 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17588 * empty {@link AccessibilityEvent} and does not perform a check whether 17589 * accessibility is enabled. 17590 * <p> 17591 * The default implementation behaves as 17592 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17593 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17594 * the case of no accessibility delegate been set. 17595 * </p> 17596 * 17597 * @param host The View hosting the delegate. 17598 * @param event The event to send. 17599 * 17600 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17601 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17602 */ 17603 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17604 host.sendAccessibilityEventUncheckedInternal(event); 17605 } 17606 17607 /** 17608 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17609 * to its children for adding their text content to the event. 17610 * <p> 17611 * The default implementation behaves as 17612 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17613 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17614 * the case of no accessibility delegate been set. 17615 * </p> 17616 * 17617 * @param host The View hosting the delegate. 17618 * @param event The event. 17619 * @return True if the event population was completed. 17620 * 17621 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17622 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17623 */ 17624 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17625 return host.dispatchPopulateAccessibilityEventInternal(event); 17626 } 17627 17628 /** 17629 * Gives a chance to the host View to populate the accessibility event with its 17630 * text content. 17631 * <p> 17632 * The default implementation behaves as 17633 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17634 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17635 * the case of no accessibility delegate been set. 17636 * </p> 17637 * 17638 * @param host The View hosting the delegate. 17639 * @param event The accessibility event which to populate. 17640 * 17641 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17642 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17643 */ 17644 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17645 host.onPopulateAccessibilityEventInternal(event); 17646 } 17647 17648 /** 17649 * Initializes an {@link AccessibilityEvent} with information about the 17650 * the host View which is the event source. 17651 * <p> 17652 * The default implementation behaves as 17653 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17654 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17655 * the case of no accessibility delegate been set. 17656 * </p> 17657 * 17658 * @param host The View hosting the delegate. 17659 * @param event The event to initialize. 17660 * 17661 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17662 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17663 */ 17664 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17665 host.onInitializeAccessibilityEventInternal(event); 17666 } 17667 17668 /** 17669 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17670 * <p> 17671 * The default implementation behaves as 17672 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17673 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17674 * the case of no accessibility delegate been set. 17675 * </p> 17676 * 17677 * @param host The View hosting the delegate. 17678 * @param info The instance to initialize. 17679 * 17680 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17681 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17682 */ 17683 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17684 host.onInitializeAccessibilityNodeInfoInternal(info); 17685 } 17686 17687 /** 17688 * Called when a child of the host View has requested sending an 17689 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17690 * to augment the event. 17691 * <p> 17692 * The default implementation behaves as 17693 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17694 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17695 * the case of no accessibility delegate been set. 17696 * </p> 17697 * 17698 * @param host The View hosting the delegate. 17699 * @param child The child which requests sending the event. 17700 * @param event The event to be sent. 17701 * @return True if the event should be sent 17702 * 17703 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17704 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17705 */ 17706 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17707 AccessibilityEvent event) { 17708 return host.onRequestSendAccessibilityEventInternal(child, event); 17709 } 17710 17711 /** 17712 * Gets the provider for managing a virtual view hierarchy rooted at this View 17713 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17714 * that explore the window content. 17715 * <p> 17716 * The default implementation behaves as 17717 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17718 * the case of no accessibility delegate been set. 17719 * </p> 17720 * 17721 * @return The provider. 17722 * 17723 * @see AccessibilityNodeProvider 17724 */ 17725 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17726 return null; 17727 } 17728 } 17729} 17730