View.java revision 6fb3b9eb28fad2447d8231356ee557b428ac55e5
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.hardware.display.DisplayManagerGlobal; 43import android.os.Bundle; 44import android.os.Handler; 45import android.os.IBinder; 46import android.os.Parcel; 47import android.os.Parcelable; 48import android.os.RemoteException; 49import android.os.SystemClock; 50import android.os.SystemProperties; 51import android.text.TextUtils; 52import android.util.AttributeSet; 53import android.util.FloatProperty; 54import android.util.LayoutDirection; 55import android.util.Log; 56import android.util.LongSparseLongArray; 57import android.util.Pools.SynchronizedPool; 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.view.transition.Scene; 78import android.widget.ScrollBarDrawable; 79 80import static android.os.Build.VERSION_CODES.*; 81import static java.lang.Math.max; 82 83import com.android.internal.R; 84import com.android.internal.util.Predicate; 85import com.android.internal.view.menu.MenuBuilder; 86import com.google.android.collect.Lists; 87import com.google.android.collect.Maps; 88 89import java.lang.ref.WeakReference; 90import java.lang.reflect.Field; 91import java.lang.reflect.InvocationTargetException; 92import java.lang.reflect.Method; 93import java.lang.reflect.Modifier; 94import java.util.ArrayList; 95import java.util.Arrays; 96import java.util.Collections; 97import java.util.HashMap; 98import java.util.Locale; 99import java.util.concurrent.CopyOnWriteArrayList; 100import java.util.concurrent.atomic.AtomicInteger; 101 102/** 103 * <p> 104 * This class represents the basic building block for user interface components. A View 105 * occupies a rectangular area on the screen and is responsible for drawing and 106 * event handling. View is the base class for <em>widgets</em>, which are 107 * used to create interactive UI components (buttons, text fields, etc.). The 108 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 109 * are invisible containers that hold other Views (or other ViewGroups) and define 110 * their layout properties. 111 * </p> 112 * 113 * <div class="special reference"> 114 * <h3>Developer Guides</h3> 115 * <p>For information about using this class to develop your application's user interface, 116 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 117 * </div> 118 * 119 * <a name="Using"></a> 120 * <h3>Using Views</h3> 121 * <p> 122 * All of the views in a window are arranged in a single tree. You can add views 123 * either from code or by specifying a tree of views in one or more XML layout 124 * files. There are many specialized subclasses of views that act as controls or 125 * are capable of displaying text, images, or other content. 126 * </p> 127 * <p> 128 * Once you have created a tree of views, there are typically a few types of 129 * common operations you may wish to perform: 130 * <ul> 131 * <li><strong>Set properties:</strong> for example setting the text of a 132 * {@link android.widget.TextView}. The available properties and the methods 133 * that set them will vary among the different subclasses of views. Note that 134 * properties that are known at build time can be set in the XML layout 135 * files.</li> 136 * <li><strong>Set focus:</strong> The framework will handled moving focus in 137 * response to user input. To force focus to a specific view, call 138 * {@link #requestFocus}.</li> 139 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 140 * that will be notified when something interesting happens to the view. For 141 * example, all views will let you set a listener to be notified when the view 142 * gains or loses focus. You can register such a listener using 143 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 144 * Other view subclasses offer more specialized listeners. For example, a Button 145 * exposes a listener to notify clients when the button is clicked.</li> 146 * <li><strong>Set visibility:</strong> You can hide or show views using 147 * {@link #setVisibility(int)}.</li> 148 * </ul> 149 * </p> 150 * <p><em> 151 * Note: The Android framework is responsible for measuring, laying out and 152 * drawing views. You should not call methods that perform these actions on 153 * views yourself unless you are actually implementing a 154 * {@link android.view.ViewGroup}. 155 * </em></p> 156 * 157 * <a name="Lifecycle"></a> 158 * <h3>Implementing a Custom View</h3> 159 * 160 * <p> 161 * To implement a custom view, you will usually begin by providing overrides for 162 * some of the standard methods that the framework calls on all views. You do 163 * not need to override all of these methods. In fact, you can start by just 164 * overriding {@link #onDraw(android.graphics.Canvas)}. 165 * <table border="2" width="85%" align="center" cellpadding="5"> 166 * <thead> 167 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 168 * </thead> 169 * 170 * <tbody> 171 * <tr> 172 * <td rowspan="2">Creation</td> 173 * <td>Constructors</td> 174 * <td>There is a form of the constructor that are called when the view 175 * is created from code and a form that is called when the view is 176 * inflated from a layout file. The second form should parse and apply 177 * any attributes defined in the layout file. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onFinishInflate()}</code></td> 182 * <td>Called after a view and all of its children has been inflated 183 * from XML.</td> 184 * </tr> 185 * 186 * <tr> 187 * <td rowspan="3">Layout</td> 188 * <td><code>{@link #onMeasure(int, int)}</code></td> 189 * <td>Called to determine the size requirements for this view and all 190 * of its children. 191 * </td> 192 * </tr> 193 * <tr> 194 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 195 * <td>Called when this view should assign a size and position to all 196 * of its children. 197 * </td> 198 * </tr> 199 * <tr> 200 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 201 * <td>Called when the size of this view has changed. 202 * </td> 203 * </tr> 204 * 205 * <tr> 206 * <td>Drawing</td> 207 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 208 * <td>Called when the view should render its content. 209 * </td> 210 * </tr> 211 * 212 * <tr> 213 * <td rowspan="4">Event processing</td> 214 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 215 * <td>Called when a new hardware key event occurs. 216 * </td> 217 * </tr> 218 * <tr> 219 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 220 * <td>Called when a hardware key up event occurs. 221 * </td> 222 * </tr> 223 * <tr> 224 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 225 * <td>Called when a trackball motion event occurs. 226 * </td> 227 * </tr> 228 * <tr> 229 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 230 * <td>Called when a touch screen motion event occurs. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="2">Focus</td> 236 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 237 * <td>Called when the view gains or loses focus. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 243 * <td>Called when the window containing the view gains or loses focus. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td rowspan="3">Attaching</td> 249 * <td><code>{@link #onAttachedToWindow()}</code></td> 250 * <td>Called when the view is attached to a window. 251 * </td> 252 * </tr> 253 * 254 * <tr> 255 * <td><code>{@link #onDetachedFromWindow}</code></td> 256 * <td>Called when the view is detached from its window. 257 * </td> 258 * </tr> 259 * 260 * <tr> 261 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 262 * <td>Called when the visibility of the window containing the view 263 * has changed. 264 * </td> 265 * </tr> 266 * </tbody> 267 * 268 * </table> 269 * </p> 270 * 271 * <a name="IDs"></a> 272 * <h3>IDs</h3> 273 * Views may have an integer id associated with them. These ids are typically 274 * assigned in the layout XML files, and are used to find specific views within 275 * the view tree. A common pattern is to: 276 * <ul> 277 * <li>Define a Button in the layout file and assign it a unique ID. 278 * <pre> 279 * <Button 280 * android:id="@+id/my_button" 281 * android:layout_width="wrap_content" 282 * android:layout_height="wrap_content" 283 * android:text="@string/my_button_text"/> 284 * </pre></li> 285 * <li>From the onCreate method of an Activity, find the Button 286 * <pre class="prettyprint"> 287 * Button myButton = (Button) findViewById(R.id.my_button); 288 * </pre></li> 289 * </ul> 290 * <p> 291 * View IDs need not be unique throughout the tree, but it is good practice to 292 * ensure that they are at least unique within the part of the tree you are 293 * searching. 294 * </p> 295 * 296 * <a name="Position"></a> 297 * <h3>Position</h3> 298 * <p> 299 * The geometry of a view is that of a rectangle. A view has a location, 300 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 301 * two dimensions, expressed as a width and a height. The unit for location 302 * and dimensions is the pixel. 303 * </p> 304 * 305 * <p> 306 * It is possible to retrieve the location of a view by invoking the methods 307 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 308 * coordinate of the rectangle representing the view. The latter returns the 309 * top, or Y, coordinate of the rectangle representing the view. These methods 310 * both return the location of the view relative to its parent. For instance, 311 * when getLeft() returns 20, that means the view is located 20 pixels to the 312 * right of the left edge of its direct parent. 313 * </p> 314 * 315 * <p> 316 * In addition, several convenience methods are offered to avoid unnecessary 317 * computations, namely {@link #getRight()} and {@link #getBottom()}. 318 * These methods return the coordinates of the right and bottom edges of the 319 * rectangle representing the view. For instance, calling {@link #getRight()} 320 * is similar to the following computation: <code>getLeft() + getWidth()</code> 321 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 322 * </p> 323 * 324 * <a name="SizePaddingMargins"></a> 325 * <h3>Size, padding and margins</h3> 326 * <p> 327 * The size of a view is expressed with a width and a height. A view actually 328 * possess two pairs of width and height values. 329 * </p> 330 * 331 * <p> 332 * The first pair is known as <em>measured width</em> and 333 * <em>measured height</em>. These dimensions define how big a view wants to be 334 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 335 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 336 * and {@link #getMeasuredHeight()}. 337 * </p> 338 * 339 * <p> 340 * The second pair is simply known as <em>width</em> and <em>height</em>, or 341 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 342 * dimensions define the actual size of the view on screen, at drawing time and 343 * after layout. These values may, but do not have to, be different from the 344 * measured width and height. The width and height can be obtained by calling 345 * {@link #getWidth()} and {@link #getHeight()}. 346 * </p> 347 * 348 * <p> 349 * To measure its dimensions, a view takes into account its padding. The padding 350 * is expressed in pixels for the left, top, right and bottom parts of the view. 351 * Padding can be used to offset the content of the view by a specific amount of 352 * pixels. For instance, a left padding of 2 will push the view's content by 353 * 2 pixels to the right of the left edge. Padding can be set using the 354 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 355 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 356 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 357 * {@link #getPaddingEnd()}. 358 * </p> 359 * 360 * <p> 361 * Even though a view can define a padding, it does not provide any support for 362 * margins. However, view groups provide such a support. Refer to 363 * {@link android.view.ViewGroup} and 364 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 365 * </p> 366 * 367 * <a name="Layout"></a> 368 * <h3>Layout</h3> 369 * <p> 370 * Layout is a two pass process: a measure pass and a layout pass. The measuring 371 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 372 * of the view tree. Each view pushes dimension specifications down the tree 373 * during the recursion. At the end of the measure pass, every view has stored 374 * its measurements. The second pass happens in 375 * {@link #layout(int,int,int,int)} and is also top-down. During 376 * this pass each parent is responsible for positioning all of its children 377 * using the sizes computed in the measure pass. 378 * </p> 379 * 380 * <p> 381 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 382 * {@link #getMeasuredHeight()} values must be set, along with those for all of 383 * that view's descendants. A view's measured width and measured height values 384 * must respect the constraints imposed by the view's parents. This guarantees 385 * that at the end of the measure pass, all parents accept all of their 386 * children's measurements. A parent view may call measure() more than once on 387 * its children. For example, the parent may measure each child once with 388 * unspecified dimensions to find out how big they want to be, then call 389 * measure() on them again with actual numbers if the sum of all the children's 390 * unconstrained sizes is too big or too small. 391 * </p> 392 * 393 * <p> 394 * The measure pass uses two classes to communicate dimensions. The 395 * {@link MeasureSpec} class is used by views to tell their parents how they 396 * want to be measured and positioned. The base LayoutParams class just 397 * describes how big the view wants to be for both width and height. For each 398 * dimension, it can specify one of: 399 * <ul> 400 * <li> an exact number 401 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 402 * (minus padding) 403 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 404 * enclose its content (plus padding). 405 * </ul> 406 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 407 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 408 * an X and Y value. 409 * </p> 410 * 411 * <p> 412 * MeasureSpecs are used to push requirements down the tree from parent to 413 * child. A MeasureSpec can be in one of three modes: 414 * <ul> 415 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 416 * of a child view. For example, a LinearLayout may call measure() on its child 417 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 418 * tall the child view wants to be given a width of 240 pixels. 419 * <li>EXACTLY: This is used by the parent to impose an exact size on the 420 * child. The child must use this size, and guarantee that all of its 421 * descendants will fit within this size. 422 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 423 * child. The child must gurantee that it and all of its descendants will fit 424 * within this size. 425 * </ul> 426 * </p> 427 * 428 * <p> 429 * To intiate a layout, call {@link #requestLayout}. This method is typically 430 * called by a view on itself when it believes that is can no longer fit within 431 * its current bounds. 432 * </p> 433 * 434 * <a name="Drawing"></a> 435 * <h3>Drawing</h3> 436 * <p> 437 * Drawing is handled by walking the tree and rendering each view that 438 * intersects the invalid region. Because the tree is traversed in-order, 439 * this means that parents will draw before (i.e., behind) their children, with 440 * siblings drawn in the order they appear in the tree. 441 * If you set a background drawable for a View, then the View will draw it for you 442 * before calling back to its <code>onDraw()</code> method. 443 * </p> 444 * 445 * <p> 446 * Note that the framework will not draw views that are not in the invalid region. 447 * </p> 448 * 449 * <p> 450 * To force a view to draw, call {@link #invalidate()}. 451 * </p> 452 * 453 * <a name="EventHandlingThreading"></a> 454 * <h3>Event Handling and Threading</h3> 455 * <p> 456 * The basic cycle of a view is as follows: 457 * <ol> 458 * <li>An event comes in and is dispatched to the appropriate view. The view 459 * handles the event and notifies any listeners.</li> 460 * <li>If in the course of processing the event, the view's bounds may need 461 * to be changed, the view will call {@link #requestLayout()}.</li> 462 * <li>Similarly, if in the course of processing the event the view's appearance 463 * may need to be changed, the view will call {@link #invalidate()}.</li> 464 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 465 * the framework will take care of measuring, laying out, and drawing the tree 466 * as appropriate.</li> 467 * </ol> 468 * </p> 469 * 470 * <p><em>Note: The entire view tree is single threaded. You must always be on 471 * the UI thread when calling any method on any view.</em> 472 * If you are doing work on other threads and want to update the state of a view 473 * from that thread, you should use a {@link Handler}. 474 * </p> 475 * 476 * <a name="FocusHandling"></a> 477 * <h3>Focus Handling</h3> 478 * <p> 479 * The framework will handle routine focus movement in response to user input. 480 * This includes changing the focus as views are removed or hidden, or as new 481 * views become available. Views indicate their willingness to take focus 482 * through the {@link #isFocusable} method. To change whether a view can take 483 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 484 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 485 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 486 * </p> 487 * <p> 488 * Focus movement is based on an algorithm which finds the nearest neighbor in a 489 * given direction. In rare cases, the default algorithm may not match the 490 * intended behavior of the developer. In these situations, you can provide 491 * explicit overrides by using these XML attributes in the layout file: 492 * <pre> 493 * nextFocusDown 494 * nextFocusLeft 495 * nextFocusRight 496 * nextFocusUp 497 * </pre> 498 * </p> 499 * 500 * 501 * <p> 502 * To get a particular view to take focus, call {@link #requestFocus()}. 503 * </p> 504 * 505 * <a name="TouchMode"></a> 506 * <h3>Touch Mode</h3> 507 * <p> 508 * When a user is navigating a user interface via directional keys such as a D-pad, it is 509 * necessary to give focus to actionable items such as buttons so the user can see 510 * what will take input. If the device has touch capabilities, however, and the user 511 * begins interacting with the interface by touching it, it is no longer necessary to 512 * always highlight, or give focus to, a particular view. This motivates a mode 513 * for interaction named 'touch mode'. 514 * </p> 515 * <p> 516 * For a touch capable device, once the user touches the screen, the device 517 * will enter touch mode. From this point onward, only views for which 518 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 519 * Other views that are touchable, like buttons, will not take focus when touched; they will 520 * only fire the on click listeners. 521 * </p> 522 * <p> 523 * Any time a user hits a directional key, such as a D-pad direction, the view device will 524 * exit touch mode, and find a view to take focus, so that the user may resume interacting 525 * with the user interface without touching the screen again. 526 * </p> 527 * <p> 528 * The touch mode state is maintained across {@link android.app.Activity}s. Call 529 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 530 * </p> 531 * 532 * <a name="Scrolling"></a> 533 * <h3>Scrolling</h3> 534 * <p> 535 * The framework provides basic support for views that wish to internally 536 * scroll their content. This includes keeping track of the X and Y scroll 537 * offset as well as mechanisms for drawing scrollbars. See 538 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 539 * {@link #awakenScrollBars()} for more details. 540 * </p> 541 * 542 * <a name="Tags"></a> 543 * <h3>Tags</h3> 544 * <p> 545 * Unlike IDs, tags are not used to identify views. Tags are essentially an 546 * extra piece of information that can be associated with a view. They are most 547 * often used as a convenience to store data related to views in the views 548 * themselves rather than by putting them in a separate structure. 549 * </p> 550 * 551 * <a name="Properties"></a> 552 * <h3>Properties</h3> 553 * <p> 554 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 555 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 556 * available both in the {@link Property} form as well as in similarly-named setter/getter 557 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 558 * be used to set persistent state associated with these rendering-related properties on the view. 559 * The properties and methods can also be used in conjunction with 560 * {@link android.animation.Animator Animator}-based animations, described more in the 561 * <a href="#Animation">Animation</a> section. 562 * </p> 563 * 564 * <a name="Animation"></a> 565 * <h3>Animation</h3> 566 * <p> 567 * Starting with Android 3.0, the preferred way of animating views is to use the 568 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 569 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 570 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 571 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 572 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 573 * makes animating these View properties particularly easy and efficient. 574 * </p> 575 * <p> 576 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 577 * You can attach an {@link Animation} object to a view using 578 * {@link #setAnimation(Animation)} or 579 * {@link #startAnimation(Animation)}. The animation can alter the scale, 580 * rotation, translation and alpha of a view over time. If the animation is 581 * attached to a view that has children, the animation will affect the entire 582 * subtree rooted by that node. When an animation is started, the framework will 583 * take care of redrawing the appropriate views until the animation completes. 584 * </p> 585 * 586 * <a name="Security"></a> 587 * <h3>Security</h3> 588 * <p> 589 * Sometimes it is essential that an application be able to verify that an action 590 * is being performed with the full knowledge and consent of the user, such as 591 * granting a permission request, making a purchase or clicking on an advertisement. 592 * Unfortunately, a malicious application could try to spoof the user into 593 * performing these actions, unaware, by concealing the intended purpose of the view. 594 * As a remedy, the framework offers a touch filtering mechanism that can be used to 595 * improve the security of views that provide access to sensitive functionality. 596 * </p><p> 597 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 598 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 599 * will discard touches that are received whenever the view's window is obscured by 600 * another visible window. As a result, the view will not receive touches whenever a 601 * toast, dialog or other window appears above the view's window. 602 * </p><p> 603 * For more fine-grained control over security, consider overriding the 604 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 605 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 606 * </p> 607 * 608 * @attr ref android.R.styleable#View_alpha 609 * @attr ref android.R.styleable#View_background 610 * @attr ref android.R.styleable#View_clickable 611 * @attr ref android.R.styleable#View_contentDescription 612 * @attr ref android.R.styleable#View_drawingCacheQuality 613 * @attr ref android.R.styleable#View_duplicateParentState 614 * @attr ref android.R.styleable#View_id 615 * @attr ref android.R.styleable#View_requiresFadingEdge 616 * @attr ref android.R.styleable#View_fadeScrollbars 617 * @attr ref android.R.styleable#View_fadingEdgeLength 618 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 619 * @attr ref android.R.styleable#View_fitsSystemWindows 620 * @attr ref android.R.styleable#View_isScrollContainer 621 * @attr ref android.R.styleable#View_focusable 622 * @attr ref android.R.styleable#View_focusableInTouchMode 623 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 624 * @attr ref android.R.styleable#View_keepScreenOn 625 * @attr ref android.R.styleable#View_layerType 626 * @attr ref android.R.styleable#View_layoutDirection 627 * @attr ref android.R.styleable#View_longClickable 628 * @attr ref android.R.styleable#View_minHeight 629 * @attr ref android.R.styleable#View_minWidth 630 * @attr ref android.R.styleable#View_nextFocusDown 631 * @attr ref android.R.styleable#View_nextFocusLeft 632 * @attr ref android.R.styleable#View_nextFocusRight 633 * @attr ref android.R.styleable#View_nextFocusUp 634 * @attr ref android.R.styleable#View_onClick 635 * @attr ref android.R.styleable#View_padding 636 * @attr ref android.R.styleable#View_paddingBottom 637 * @attr ref android.R.styleable#View_paddingLeft 638 * @attr ref android.R.styleable#View_paddingRight 639 * @attr ref android.R.styleable#View_paddingTop 640 * @attr ref android.R.styleable#View_paddingStart 641 * @attr ref android.R.styleable#View_paddingEnd 642 * @attr ref android.R.styleable#View_saveEnabled 643 * @attr ref android.R.styleable#View_rotation 644 * @attr ref android.R.styleable#View_rotationX 645 * @attr ref android.R.styleable#View_rotationY 646 * @attr ref android.R.styleable#View_scaleX 647 * @attr ref android.R.styleable#View_scaleY 648 * @attr ref android.R.styleable#View_scrollX 649 * @attr ref android.R.styleable#View_scrollY 650 * @attr ref android.R.styleable#View_scrollbarSize 651 * @attr ref android.R.styleable#View_scrollbarStyle 652 * @attr ref android.R.styleable#View_scrollbars 653 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 654 * @attr ref android.R.styleable#View_scrollbarFadeDuration 655 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 656 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 657 * @attr ref android.R.styleable#View_scrollbarThumbVertical 658 * @attr ref android.R.styleable#View_scrollbarTrackVertical 659 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 660 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 661 * @attr ref android.R.styleable#View_soundEffectsEnabled 662 * @attr ref android.R.styleable#View_tag 663 * @attr ref android.R.styleable#View_textAlignment 664 * @attr ref android.R.styleable#View_textDirection 665 * @attr ref android.R.styleable#View_transformPivotX 666 * @attr ref android.R.styleable#View_transformPivotY 667 * @attr ref android.R.styleable#View_translationX 668 * @attr ref android.R.styleable#View_translationY 669 * @attr ref android.R.styleable#View_visibility 670 * 671 * @see android.view.ViewGroup 672 */ 673public class View implements Drawable.Callback, KeyEvent.Callback, 674 AccessibilityEventSource { 675 private static final boolean DBG = false; 676 677 /** 678 * The logging tag used by this class with android.util.Log. 679 */ 680 protected static final String VIEW_LOG_TAG = "View"; 681 682 /** 683 * When set to true, apps will draw debugging information about their layouts. 684 * 685 * @hide 686 */ 687 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 688 689 /** 690 * Used to mark a View that has no ID. 691 */ 692 public static final int NO_ID = -1; 693 694 private static boolean sUseBrokenMakeMeasureSpec = false; 695 696 /** 697 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 698 * calling setFlags. 699 */ 700 private static final int NOT_FOCUSABLE = 0x00000000; 701 702 /** 703 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 704 * setFlags. 705 */ 706 private static final int FOCUSABLE = 0x00000001; 707 708 /** 709 * Mask for use with setFlags indicating bits used for focus. 710 */ 711 private static final int FOCUSABLE_MASK = 0x00000001; 712 713 /** 714 * This view will adjust its padding to fit sytem windows (e.g. status bar) 715 */ 716 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 717 718 /** 719 * This view is visible. 720 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 721 * android:visibility}. 722 */ 723 public static final int VISIBLE = 0x00000000; 724 725 /** 726 * This view is invisible, but it still takes up space for layout purposes. 727 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 728 * android:visibility}. 729 */ 730 public static final int INVISIBLE = 0x00000004; 731 732 /** 733 * This view is invisible, and it doesn't take any space for layout 734 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 735 * android:visibility}. 736 */ 737 public static final int GONE = 0x00000008; 738 739 /** 740 * Mask for use with setFlags indicating bits used for visibility. 741 * {@hide} 742 */ 743 static final int VISIBILITY_MASK = 0x0000000C; 744 745 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 746 747 /** 748 * This view is enabled. Interpretation varies by subclass. 749 * Use with ENABLED_MASK when calling setFlags. 750 * {@hide} 751 */ 752 static final int ENABLED = 0x00000000; 753 754 /** 755 * This view is disabled. Interpretation varies by subclass. 756 * Use with ENABLED_MASK when calling setFlags. 757 * {@hide} 758 */ 759 static final int DISABLED = 0x00000020; 760 761 /** 762 * Mask for use with setFlags indicating bits used for indicating whether 763 * this view is enabled 764 * {@hide} 765 */ 766 static final int ENABLED_MASK = 0x00000020; 767 768 /** 769 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 770 * called and further optimizations will be performed. It is okay to have 771 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 772 * {@hide} 773 */ 774 static final int WILL_NOT_DRAW = 0x00000080; 775 776 /** 777 * Mask for use with setFlags indicating bits used for indicating whether 778 * this view is will draw 779 * {@hide} 780 */ 781 static final int DRAW_MASK = 0x00000080; 782 783 /** 784 * <p>This view doesn't show scrollbars.</p> 785 * {@hide} 786 */ 787 static final int SCROLLBARS_NONE = 0x00000000; 788 789 /** 790 * <p>This view shows horizontal scrollbars.</p> 791 * {@hide} 792 */ 793 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 794 795 /** 796 * <p>This view shows vertical scrollbars.</p> 797 * {@hide} 798 */ 799 static final int SCROLLBARS_VERTICAL = 0x00000200; 800 801 /** 802 * <p>Mask for use with setFlags indicating bits used for indicating which 803 * scrollbars are enabled.</p> 804 * {@hide} 805 */ 806 static final int SCROLLBARS_MASK = 0x00000300; 807 808 /** 809 * Indicates that the view should filter touches when its window is obscured. 810 * Refer to the class comments for more information about this security feature. 811 * {@hide} 812 */ 813 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 814 815 /** 816 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 817 * that they are optional and should be skipped if the window has 818 * requested system UI flags that ignore those insets for layout. 819 */ 820 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 821 822 /** 823 * <p>This view doesn't show fading edges.</p> 824 * {@hide} 825 */ 826 static final int FADING_EDGE_NONE = 0x00000000; 827 828 /** 829 * <p>This view shows horizontal fading edges.</p> 830 * {@hide} 831 */ 832 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 833 834 /** 835 * <p>This view shows vertical fading edges.</p> 836 * {@hide} 837 */ 838 static final int FADING_EDGE_VERTICAL = 0x00002000; 839 840 /** 841 * <p>Mask for use with setFlags indicating bits used for indicating which 842 * fading edges are enabled.</p> 843 * {@hide} 844 */ 845 static final int FADING_EDGE_MASK = 0x00003000; 846 847 /** 848 * <p>Indicates this view can be clicked. When clickable, a View reacts 849 * to clicks by notifying the OnClickListener.<p> 850 * {@hide} 851 */ 852 static final int CLICKABLE = 0x00004000; 853 854 /** 855 * <p>Indicates this view is caching its drawing into a bitmap.</p> 856 * {@hide} 857 */ 858 static final int DRAWING_CACHE_ENABLED = 0x00008000; 859 860 /** 861 * <p>Indicates that no icicle should be saved for this view.<p> 862 * {@hide} 863 */ 864 static final int SAVE_DISABLED = 0x000010000; 865 866 /** 867 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 868 * property.</p> 869 * {@hide} 870 */ 871 static final int SAVE_DISABLED_MASK = 0x000010000; 872 873 /** 874 * <p>Indicates that no drawing cache should ever be created for this view.<p> 875 * {@hide} 876 */ 877 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 878 879 /** 880 * <p>Indicates this view can take / keep focus when int touch mode.</p> 881 * {@hide} 882 */ 883 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 884 885 /** 886 * <p>Enables low quality mode for the drawing cache.</p> 887 */ 888 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 889 890 /** 891 * <p>Enables high quality mode for the drawing cache.</p> 892 */ 893 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 894 895 /** 896 * <p>Enables automatic quality mode for the drawing cache.</p> 897 */ 898 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 899 900 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 901 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 902 }; 903 904 /** 905 * <p>Mask for use with setFlags indicating bits used for the cache 906 * quality property.</p> 907 * {@hide} 908 */ 909 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 910 911 /** 912 * <p> 913 * Indicates this view can be long clicked. When long clickable, a View 914 * reacts to long clicks by notifying the OnLongClickListener or showing a 915 * context menu. 916 * </p> 917 * {@hide} 918 */ 919 static final int LONG_CLICKABLE = 0x00200000; 920 921 /** 922 * <p>Indicates that this view gets its drawable states from its direct parent 923 * and ignores its original internal states.</p> 924 * 925 * @hide 926 */ 927 static final int DUPLICATE_PARENT_STATE = 0x00400000; 928 929 /** 930 * The scrollbar style to display the scrollbars inside the content area, 931 * without increasing the padding. The scrollbars will be overlaid with 932 * translucency on the view's content. 933 */ 934 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 935 936 /** 937 * The scrollbar style to display the scrollbars inside the padded area, 938 * increasing the padding of the view. The scrollbars will not overlap the 939 * content area of the view. 940 */ 941 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 942 943 /** 944 * The scrollbar style to display the scrollbars at the edge of the view, 945 * without increasing the padding. The scrollbars will be overlaid with 946 * translucency. 947 */ 948 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 949 950 /** 951 * The scrollbar style to display the scrollbars at the edge of the view, 952 * increasing the padding of the view. The scrollbars will only overlap the 953 * background, if any. 954 */ 955 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 956 957 /** 958 * Mask to check if the scrollbar style is overlay or inset. 959 * {@hide} 960 */ 961 static final int SCROLLBARS_INSET_MASK = 0x01000000; 962 963 /** 964 * Mask to check if the scrollbar style is inside or outside. 965 * {@hide} 966 */ 967 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 968 969 /** 970 * Mask for scrollbar style. 971 * {@hide} 972 */ 973 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 974 975 /** 976 * View flag indicating that the screen should remain on while the 977 * window containing this view is visible to the user. This effectively 978 * takes care of automatically setting the WindowManager's 979 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 980 */ 981 public static final int KEEP_SCREEN_ON = 0x04000000; 982 983 /** 984 * View flag indicating whether this view should have sound effects enabled 985 * for events such as clicking and touching. 986 */ 987 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 988 989 /** 990 * View flag indicating whether this view should have haptic feedback 991 * enabled for events such as long presses. 992 */ 993 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 994 995 /** 996 * <p>Indicates that the view hierarchy should stop saving state when 997 * it reaches this view. If state saving is initiated immediately at 998 * the view, it will be allowed. 999 * {@hide} 1000 */ 1001 static final int PARENT_SAVE_DISABLED = 0x20000000; 1002 1003 /** 1004 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1005 * {@hide} 1006 */ 1007 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1008 1009 /** 1010 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1011 * should add all focusable Views regardless if they are focusable in touch mode. 1012 */ 1013 public static final int FOCUSABLES_ALL = 0x00000000; 1014 1015 /** 1016 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1017 * should add only Views focusable in touch mode. 1018 */ 1019 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1020 1021 /** 1022 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1023 * item. 1024 */ 1025 public static final int FOCUS_BACKWARD = 0x00000001; 1026 1027 /** 1028 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1029 * item. 1030 */ 1031 public static final int FOCUS_FORWARD = 0x00000002; 1032 1033 /** 1034 * Use with {@link #focusSearch(int)}. Move focus to the left. 1035 */ 1036 public static final int FOCUS_LEFT = 0x00000011; 1037 1038 /** 1039 * Use with {@link #focusSearch(int)}. Move focus up. 1040 */ 1041 public static final int FOCUS_UP = 0x00000021; 1042 1043 /** 1044 * Use with {@link #focusSearch(int)}. Move focus to the right. 1045 */ 1046 public static final int FOCUS_RIGHT = 0x00000042; 1047 1048 /** 1049 * Use with {@link #focusSearch(int)}. Move focus down. 1050 */ 1051 public static final int FOCUS_DOWN = 0x00000082; 1052 1053 /** 1054 * Bits of {@link #getMeasuredWidthAndState()} and 1055 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1056 */ 1057 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1058 1059 /** 1060 * Bits of {@link #getMeasuredWidthAndState()} and 1061 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1062 */ 1063 public static final int MEASURED_STATE_MASK = 0xff000000; 1064 1065 /** 1066 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1067 * for functions that combine both width and height into a single int, 1068 * such as {@link #getMeasuredState()} and the childState argument of 1069 * {@link #resolveSizeAndState(int, int, int)}. 1070 */ 1071 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1072 1073 /** 1074 * Bit of {@link #getMeasuredWidthAndState()} and 1075 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1076 * is smaller that the space the view would like to have. 1077 */ 1078 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1079 1080 /** 1081 * Base View state sets 1082 */ 1083 // Singles 1084 /** 1085 * Indicates the view has no states set. States are used with 1086 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1087 * view depending on its state. 1088 * 1089 * @see android.graphics.drawable.Drawable 1090 * @see #getDrawableState() 1091 */ 1092 protected static final int[] EMPTY_STATE_SET; 1093 /** 1094 * Indicates the view is enabled. States are used with 1095 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1096 * view depending on its state. 1097 * 1098 * @see android.graphics.drawable.Drawable 1099 * @see #getDrawableState() 1100 */ 1101 protected static final int[] ENABLED_STATE_SET; 1102 /** 1103 * Indicates the view is focused. States are used with 1104 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1105 * view depending on its state. 1106 * 1107 * @see android.graphics.drawable.Drawable 1108 * @see #getDrawableState() 1109 */ 1110 protected static final int[] FOCUSED_STATE_SET; 1111 /** 1112 * Indicates the view is selected. States are used with 1113 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1114 * view depending on its state. 1115 * 1116 * @see android.graphics.drawable.Drawable 1117 * @see #getDrawableState() 1118 */ 1119 protected static final int[] SELECTED_STATE_SET; 1120 /** 1121 * Indicates the view is pressed. States are used with 1122 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1123 * view depending on its state. 1124 * 1125 * @see android.graphics.drawable.Drawable 1126 * @see #getDrawableState() 1127 */ 1128 protected static final int[] PRESSED_STATE_SET; 1129 /** 1130 * Indicates the view's window has focus. States are used with 1131 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1132 * view depending on its state. 1133 * 1134 * @see android.graphics.drawable.Drawable 1135 * @see #getDrawableState() 1136 */ 1137 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1138 // Doubles 1139 /** 1140 * Indicates the view is enabled and has the focus. 1141 * 1142 * @see #ENABLED_STATE_SET 1143 * @see #FOCUSED_STATE_SET 1144 */ 1145 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1146 /** 1147 * Indicates the view is enabled and selected. 1148 * 1149 * @see #ENABLED_STATE_SET 1150 * @see #SELECTED_STATE_SET 1151 */ 1152 protected static final int[] ENABLED_SELECTED_STATE_SET; 1153 /** 1154 * Indicates the view is enabled and that its window has focus. 1155 * 1156 * @see #ENABLED_STATE_SET 1157 * @see #WINDOW_FOCUSED_STATE_SET 1158 */ 1159 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1160 /** 1161 * Indicates the view is focused and selected. 1162 * 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 */ 1166 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1167 /** 1168 * Indicates the view has the focus and that its window has the focus. 1169 * 1170 * @see #FOCUSED_STATE_SET 1171 * @see #WINDOW_FOCUSED_STATE_SET 1172 */ 1173 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1174 /** 1175 * Indicates the view is selected and that its window has the focus. 1176 * 1177 * @see #SELECTED_STATE_SET 1178 * @see #WINDOW_FOCUSED_STATE_SET 1179 */ 1180 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1181 // Triples 1182 /** 1183 * Indicates the view is enabled, focused and selected. 1184 * 1185 * @see #ENABLED_STATE_SET 1186 * @see #FOCUSED_STATE_SET 1187 * @see #SELECTED_STATE_SET 1188 */ 1189 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1190 /** 1191 * Indicates the view is enabled, focused and its window has the focus. 1192 * 1193 * @see #ENABLED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 * @see #WINDOW_FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is enabled, selected and its window has the focus. 1200 * 1201 * @see #ENABLED_STATE_SET 1202 * @see #SELECTED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is focused, selected and its window has the focus. 1208 * 1209 * @see #FOCUSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #WINDOW_FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1214 /** 1215 * Indicates the view is enabled, focused, selected and its window 1216 * has the focus. 1217 * 1218 * @see #ENABLED_STATE_SET 1219 * @see #FOCUSED_STATE_SET 1220 * @see #SELECTED_STATE_SET 1221 * @see #WINDOW_FOCUSED_STATE_SET 1222 */ 1223 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1224 /** 1225 * Indicates the view is pressed and its window has the focus. 1226 * 1227 * @see #PRESSED_STATE_SET 1228 * @see #WINDOW_FOCUSED_STATE_SET 1229 */ 1230 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1231 /** 1232 * Indicates the view is pressed and selected. 1233 * 1234 * @see #PRESSED_STATE_SET 1235 * @see #SELECTED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_SELECTED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed, selected and its window has the focus. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 * @see #WINDOW_FOCUSED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed and focused. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 */ 1252 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1253 /** 1254 * Indicates the view is pressed, focused and its window has the focus. 1255 * 1256 * @see #PRESSED_STATE_SET 1257 * @see #FOCUSED_STATE_SET 1258 * @see #WINDOW_FOCUSED_STATE_SET 1259 */ 1260 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1261 /** 1262 * Indicates the view is pressed, focused and selected. 1263 * 1264 * @see #PRESSED_STATE_SET 1265 * @see #SELECTED_STATE_SET 1266 * @see #FOCUSED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, focused, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #FOCUSED_STATE_SET 1274 * @see #SELECTED_STATE_SET 1275 * @see #WINDOW_FOCUSED_STATE_SET 1276 */ 1277 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1278 /** 1279 * Indicates the view is pressed and enabled. 1280 * 1281 * @see #PRESSED_STATE_SET 1282 * @see #ENABLED_STATE_SET 1283 */ 1284 protected static final int[] PRESSED_ENABLED_STATE_SET; 1285 /** 1286 * Indicates the view is pressed, enabled and its window has the focus. 1287 * 1288 * @see #PRESSED_STATE_SET 1289 * @see #ENABLED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1293 /** 1294 * Indicates the view is pressed, enabled and selected. 1295 * 1296 * @see #PRESSED_STATE_SET 1297 * @see #ENABLED_STATE_SET 1298 * @see #SELECTED_STATE_SET 1299 */ 1300 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1301 /** 1302 * Indicates the view is pressed, enabled, selected and its window has the 1303 * focus. 1304 * 1305 * @see #PRESSED_STATE_SET 1306 * @see #ENABLED_STATE_SET 1307 * @see #SELECTED_STATE_SET 1308 * @see #WINDOW_FOCUSED_STATE_SET 1309 */ 1310 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1311 /** 1312 * Indicates the view is pressed, enabled and focused. 1313 * 1314 * @see #PRESSED_STATE_SET 1315 * @see #ENABLED_STATE_SET 1316 * @see #FOCUSED_STATE_SET 1317 */ 1318 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1319 /** 1320 * Indicates the view is pressed, enabled, focused and its window has the 1321 * focus. 1322 * 1323 * @see #PRESSED_STATE_SET 1324 * @see #ENABLED_STATE_SET 1325 * @see #FOCUSED_STATE_SET 1326 * @see #WINDOW_FOCUSED_STATE_SET 1327 */ 1328 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1329 /** 1330 * Indicates the view is pressed, enabled, focused and selected. 1331 * 1332 * @see #PRESSED_STATE_SET 1333 * @see #ENABLED_STATE_SET 1334 * @see #SELECTED_STATE_SET 1335 * @see #FOCUSED_STATE_SET 1336 */ 1337 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1338 /** 1339 * Indicates the view is pressed, enabled, focused, selected and its window 1340 * has the focus. 1341 * 1342 * @see #PRESSED_STATE_SET 1343 * @see #ENABLED_STATE_SET 1344 * @see #SELECTED_STATE_SET 1345 * @see #FOCUSED_STATE_SET 1346 * @see #WINDOW_FOCUSED_STATE_SET 1347 */ 1348 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1349 1350 /** 1351 * The order here is very important to {@link #getDrawableState()} 1352 */ 1353 private static final int[][] VIEW_STATE_SETS; 1354 1355 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1356 static final int VIEW_STATE_SELECTED = 1 << 1; 1357 static final int VIEW_STATE_FOCUSED = 1 << 2; 1358 static final int VIEW_STATE_ENABLED = 1 << 3; 1359 static final int VIEW_STATE_PRESSED = 1 << 4; 1360 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1361 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1362 static final int VIEW_STATE_HOVERED = 1 << 7; 1363 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1364 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1365 1366 static final int[] VIEW_STATE_IDS = new int[] { 1367 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1368 R.attr.state_selected, VIEW_STATE_SELECTED, 1369 R.attr.state_focused, VIEW_STATE_FOCUSED, 1370 R.attr.state_enabled, VIEW_STATE_ENABLED, 1371 R.attr.state_pressed, VIEW_STATE_PRESSED, 1372 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1373 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1374 R.attr.state_hovered, VIEW_STATE_HOVERED, 1375 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1376 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1377 }; 1378 1379 static { 1380 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1381 throw new IllegalStateException( 1382 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1383 } 1384 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1385 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1386 int viewState = R.styleable.ViewDrawableStates[i]; 1387 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1388 if (VIEW_STATE_IDS[j] == viewState) { 1389 orderedIds[i * 2] = viewState; 1390 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1391 } 1392 } 1393 } 1394 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1395 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1396 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1397 int numBits = Integer.bitCount(i); 1398 int[] set = new int[numBits]; 1399 int pos = 0; 1400 for (int j = 0; j < orderedIds.length; j += 2) { 1401 if ((i & orderedIds[j+1]) != 0) { 1402 set[pos++] = orderedIds[j]; 1403 } 1404 } 1405 VIEW_STATE_SETS[i] = set; 1406 } 1407 1408 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1409 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1410 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1411 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1413 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1414 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1416 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1418 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED]; 1421 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1422 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1423 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1424 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1425 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1426 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1428 | VIEW_STATE_ENABLED]; 1429 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1431 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1433 | VIEW_STATE_ENABLED]; 1434 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1436 | VIEW_STATE_ENABLED]; 1437 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1439 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1440 1441 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1442 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1444 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1446 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1448 | VIEW_STATE_PRESSED]; 1449 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1451 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1453 | VIEW_STATE_PRESSED]; 1454 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1456 | VIEW_STATE_PRESSED]; 1457 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1460 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1462 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1464 | VIEW_STATE_PRESSED]; 1465 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1467 | VIEW_STATE_PRESSED]; 1468 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1471 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1473 | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1476 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1477 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1479 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1480 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1482 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1483 | VIEW_STATE_PRESSED]; 1484 } 1485 1486 /** 1487 * Accessibility event types that are dispatched for text population. 1488 */ 1489 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1490 AccessibilityEvent.TYPE_VIEW_CLICKED 1491 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1492 | AccessibilityEvent.TYPE_VIEW_SELECTED 1493 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1494 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1495 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1496 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1497 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1498 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1499 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1500 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1501 1502 /** 1503 * Temporary Rect currently for use in setBackground(). This will probably 1504 * be extended in the future to hold our own class with more than just 1505 * a Rect. :) 1506 */ 1507 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1508 1509 /** 1510 * Map used to store views' tags. 1511 */ 1512 private SparseArray<Object> mKeyedTags; 1513 1514 /** 1515 * The next available accessibility id. 1516 */ 1517 private static int sNextAccessibilityViewId; 1518 1519 /** 1520 * The animation currently associated with this view. 1521 * @hide 1522 */ 1523 protected Animation mCurrentAnimation = null; 1524 1525 /** 1526 * Width as measured during measure pass. 1527 * {@hide} 1528 */ 1529 @ViewDebug.ExportedProperty(category = "measurement") 1530 int mMeasuredWidth; 1531 1532 /** 1533 * Height as measured during measure pass. 1534 * {@hide} 1535 */ 1536 @ViewDebug.ExportedProperty(category = "measurement") 1537 int mMeasuredHeight; 1538 1539 /** 1540 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1541 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1542 * its display list. This flag, used only when hw accelerated, allows us to clear the 1543 * flag while retaining this information until it's needed (at getDisplayList() time and 1544 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1545 * 1546 * {@hide} 1547 */ 1548 boolean mRecreateDisplayList = false; 1549 1550 /** 1551 * The view's identifier. 1552 * {@hide} 1553 * 1554 * @see #setId(int) 1555 * @see #getId() 1556 */ 1557 @ViewDebug.ExportedProperty(resolveId = true) 1558 int mID = NO_ID; 1559 1560 /** 1561 * The stable ID of this view for accessibility purposes. 1562 */ 1563 int mAccessibilityViewId = NO_ID; 1564 1565 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1566 1567 SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent; 1568 1569 /** 1570 * The view's tag. 1571 * {@hide} 1572 * 1573 * @see #setTag(Object) 1574 * @see #getTag() 1575 */ 1576 protected Object mTag; 1577 1578 private Scene mCurrentScene = null; 1579 1580 // for mPrivateFlags: 1581 /** {@hide} */ 1582 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1583 /** {@hide} */ 1584 static final int PFLAG_FOCUSED = 0x00000002; 1585 /** {@hide} */ 1586 static final int PFLAG_SELECTED = 0x00000004; 1587 /** {@hide} */ 1588 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1589 /** {@hide} */ 1590 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1591 /** {@hide} */ 1592 static final int PFLAG_DRAWN = 0x00000020; 1593 /** 1594 * When this flag is set, this view is running an animation on behalf of its 1595 * children and should therefore not cancel invalidate requests, even if they 1596 * lie outside of this view's bounds. 1597 * 1598 * {@hide} 1599 */ 1600 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1601 /** {@hide} */ 1602 static final int PFLAG_SKIP_DRAW = 0x00000080; 1603 /** {@hide} */ 1604 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1605 /** {@hide} */ 1606 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1607 /** {@hide} */ 1608 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1609 /** {@hide} */ 1610 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1611 /** {@hide} */ 1612 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1613 /** {@hide} */ 1614 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1615 1616 private static final int PFLAG_PRESSED = 0x00004000; 1617 1618 /** {@hide} */ 1619 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1620 /** 1621 * Flag used to indicate that this view should be drawn once more (and only once 1622 * more) after its animation has completed. 1623 * {@hide} 1624 */ 1625 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1626 1627 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1628 1629 /** 1630 * Indicates that the View returned true when onSetAlpha() was called and that 1631 * the alpha must be restored. 1632 * {@hide} 1633 */ 1634 static final int PFLAG_ALPHA_SET = 0x00040000; 1635 1636 /** 1637 * Set by {@link #setScrollContainer(boolean)}. 1638 */ 1639 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1640 1641 /** 1642 * Set by {@link #setScrollContainer(boolean)}. 1643 */ 1644 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1645 1646 /** 1647 * View flag indicating whether this view was invalidated (fully or partially.) 1648 * 1649 * @hide 1650 */ 1651 static final int PFLAG_DIRTY = 0x00200000; 1652 1653 /** 1654 * View flag indicating whether this view was invalidated by an opaque 1655 * invalidate request. 1656 * 1657 * @hide 1658 */ 1659 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1660 1661 /** 1662 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1663 * 1664 * @hide 1665 */ 1666 static final int PFLAG_DIRTY_MASK = 0x00600000; 1667 1668 /** 1669 * Indicates whether the background is opaque. 1670 * 1671 * @hide 1672 */ 1673 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1674 1675 /** 1676 * Indicates whether the scrollbars are opaque. 1677 * 1678 * @hide 1679 */ 1680 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1681 1682 /** 1683 * Indicates whether the view is opaque. 1684 * 1685 * @hide 1686 */ 1687 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1688 1689 /** 1690 * Indicates a prepressed state; 1691 * the short time between ACTION_DOWN and recognizing 1692 * a 'real' press. Prepressed is used to recognize quick taps 1693 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1694 * 1695 * @hide 1696 */ 1697 private static final int PFLAG_PREPRESSED = 0x02000000; 1698 1699 /** 1700 * Indicates whether the view is temporarily detached. 1701 * 1702 * @hide 1703 */ 1704 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1705 1706 /** 1707 * Indicates that we should awaken scroll bars once attached 1708 * 1709 * @hide 1710 */ 1711 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1712 1713 /** 1714 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1715 * @hide 1716 */ 1717 private static final int PFLAG_HOVERED = 0x10000000; 1718 1719 /** 1720 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1721 * for transform operations 1722 * 1723 * @hide 1724 */ 1725 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1726 1727 /** {@hide} */ 1728 static final int PFLAG_ACTIVATED = 0x40000000; 1729 1730 /** 1731 * Indicates that this view was specifically invalidated, not just dirtied because some 1732 * child view was invalidated. The flag is used to determine when we need to recreate 1733 * a view's display list (as opposed to just returning a reference to its existing 1734 * display list). 1735 * 1736 * @hide 1737 */ 1738 static final int PFLAG_INVALIDATED = 0x80000000; 1739 1740 /** 1741 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1742 * 1743 * -------|-------|-------|-------| 1744 * PFLAG2_TEXT_ALIGNMENT_FLAGS[0] 1745 * PFLAG2_TEXT_DIRECTION_FLAGS[0] 1746 * 1 PFLAG2_DRAG_CAN_ACCEPT 1747 * 1 PFLAG2_DRAG_HOVERED 1748 * 1 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT 1749 * 11 PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1750 * 1 1 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT 1751 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1752 * 11 1 PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 1753 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1754 * 1 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT 1755 * 1 1 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT 1756 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1757 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1758 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1759 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1760 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1761 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1762 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1763 * 111 PFLAG2_TEXT_DIRECTION_MASK 1764 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1765 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1766 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1767 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1768 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1769 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1770 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1771 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1772 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1773 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1774 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1775 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1776 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1777 * 11 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1778 * 1 PFLAG2_HAS_TRANSIENT_STATE 1779 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1780 * 1 PFLAG2_ACCESSIBILITY_STATE_CHANGED 1781 * 1 PFLAG2_VIEW_QUICK_REJECTED 1782 * 1 PFLAG2_PADDING_RESOLVED 1783 * -------|-------|-------|-------| 1784 */ 1785 1786 /** 1787 * Indicates that this view has reported that it can accept the current drag's content. 1788 * Cleared when the drag operation concludes. 1789 * @hide 1790 */ 1791 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1792 1793 /** 1794 * Indicates that this view is currently directly under the drag location in a 1795 * drag-and-drop operation involving content that it can accept. Cleared when 1796 * the drag exits the view, or when the drag operation concludes. 1797 * @hide 1798 */ 1799 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1800 1801 /** 1802 * Horizontal layout direction of this view is from Left to Right. 1803 * Use with {@link #setLayoutDirection}. 1804 */ 1805 public static final int LAYOUT_DIRECTION_LTR = LayoutDirection.LTR; 1806 1807 /** 1808 * Horizontal layout direction of this view is from Right to Left. 1809 * Use with {@link #setLayoutDirection}. 1810 */ 1811 public static final int LAYOUT_DIRECTION_RTL = LayoutDirection.RTL; 1812 1813 /** 1814 * Horizontal layout direction of this view is inherited from its parent. 1815 * Use with {@link #setLayoutDirection}. 1816 */ 1817 public static final int LAYOUT_DIRECTION_INHERIT = LayoutDirection.INHERIT; 1818 1819 /** 1820 * Horizontal layout direction of this view is from deduced from the default language 1821 * script for the locale. Use with {@link #setLayoutDirection}. 1822 */ 1823 public static final int LAYOUT_DIRECTION_LOCALE = LayoutDirection.LOCALE; 1824 1825 /** 1826 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1827 * @hide 1828 */ 1829 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1830 1831 /** 1832 * Mask for use with private flags indicating bits used for horizontal layout direction. 1833 * @hide 1834 */ 1835 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1836 1837 /** 1838 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1839 * right-to-left direction. 1840 * @hide 1841 */ 1842 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1843 1844 /** 1845 * Indicates whether the view horizontal layout direction has been resolved. 1846 * @hide 1847 */ 1848 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1849 1850 /** 1851 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1852 * @hide 1853 */ 1854 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1855 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1856 1857 /* 1858 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1859 * flag value. 1860 * @hide 1861 */ 1862 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1863 LAYOUT_DIRECTION_LTR, 1864 LAYOUT_DIRECTION_RTL, 1865 LAYOUT_DIRECTION_INHERIT, 1866 LAYOUT_DIRECTION_LOCALE 1867 }; 1868 1869 /** 1870 * Default horizontal layout direction. 1871 */ 1872 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1873 1874 /** 1875 * Default horizontal layout direction. 1876 * @hide 1877 */ 1878 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1879 1880 /** 1881 * Indicates that the view is tracking some sort of transient state 1882 * that the app should not need to be aware of, but that the framework 1883 * should take special care to preserve. 1884 * 1885 * @hide 1886 */ 1887 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x1 << 22; 1888 1889 /** 1890 * Text direction is inherited thru {@link ViewGroup} 1891 */ 1892 public static final int TEXT_DIRECTION_INHERIT = 0; 1893 1894 /** 1895 * Text direction is using "first strong algorithm". The first strong directional character 1896 * determines the paragraph direction. If there is no strong directional character, the 1897 * paragraph direction is the view's resolved layout direction. 1898 */ 1899 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1900 1901 /** 1902 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1903 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1904 * If there are neither, the paragraph direction is the view's resolved layout direction. 1905 */ 1906 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1907 1908 /** 1909 * Text direction is forced to LTR. 1910 */ 1911 public static final int TEXT_DIRECTION_LTR = 3; 1912 1913 /** 1914 * Text direction is forced to RTL. 1915 */ 1916 public static final int TEXT_DIRECTION_RTL = 4; 1917 1918 /** 1919 * Text direction is coming from the system Locale. 1920 */ 1921 public static final int TEXT_DIRECTION_LOCALE = 5; 1922 1923 /** 1924 * Default text direction is inherited 1925 */ 1926 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1927 1928 /** 1929 * Default resolved text direction 1930 * @hide 1931 */ 1932 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 1933 1934 /** 1935 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1936 * @hide 1937 */ 1938 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1939 1940 /** 1941 * Mask for use with private flags indicating bits used for text direction. 1942 * @hide 1943 */ 1944 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1945 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1946 1947 /** 1948 * Array of text direction flags for mapping attribute "textDirection" to correct 1949 * flag value. 1950 * @hide 1951 */ 1952 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1953 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1954 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1955 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1956 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1957 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1958 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1959 }; 1960 1961 /** 1962 * Indicates whether the view text direction has been resolved. 1963 * @hide 1964 */ 1965 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1966 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1967 1968 /** 1969 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1970 * @hide 1971 */ 1972 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1973 1974 /** 1975 * Mask for use with private flags indicating bits used for resolved text direction. 1976 * @hide 1977 */ 1978 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1979 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1980 1981 /** 1982 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1983 * @hide 1984 */ 1985 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1986 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1987 1988 /* 1989 * Default text alignment. The text alignment of this View is inherited from its parent. 1990 * Use with {@link #setTextAlignment(int)} 1991 */ 1992 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1993 1994 /** 1995 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1996 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1997 * 1998 * Use with {@link #setTextAlignment(int)} 1999 */ 2000 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 2001 2002 /** 2003 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 2004 * 2005 * Use with {@link #setTextAlignment(int)} 2006 */ 2007 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2008 2009 /** 2010 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2011 * 2012 * Use with {@link #setTextAlignment(int)} 2013 */ 2014 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2015 2016 /** 2017 * Center the paragraph, e.g. ALIGN_CENTER. 2018 * 2019 * Use with {@link #setTextAlignment(int)} 2020 */ 2021 public static final int TEXT_ALIGNMENT_CENTER = 4; 2022 2023 /** 2024 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2025 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2026 * 2027 * Use with {@link #setTextAlignment(int)} 2028 */ 2029 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2030 2031 /** 2032 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2033 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2034 * 2035 * Use with {@link #setTextAlignment(int)} 2036 */ 2037 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2038 2039 /** 2040 * Default text alignment is inherited 2041 */ 2042 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2043 2044 /** 2045 * Default resolved text alignment 2046 * @hide 2047 */ 2048 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2049 2050 /** 2051 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2052 * @hide 2053 */ 2054 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2055 2056 /** 2057 * Mask for use with private flags indicating bits used for text alignment. 2058 * @hide 2059 */ 2060 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2061 2062 /** 2063 * Array of text direction flags for mapping attribute "textAlignment" to correct 2064 * flag value. 2065 * @hide 2066 */ 2067 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2068 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2069 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2070 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2071 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2072 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2073 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2074 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2075 }; 2076 2077 /** 2078 * Indicates whether the view text alignment has been resolved. 2079 * @hide 2080 */ 2081 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2082 2083 /** 2084 * Bit shift to get the resolved text alignment. 2085 * @hide 2086 */ 2087 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2088 2089 /** 2090 * Mask for use with private flags indicating bits used for text alignment. 2091 * @hide 2092 */ 2093 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2094 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2095 2096 /** 2097 * Indicates whether if the view text alignment has been resolved to gravity 2098 */ 2099 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2100 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2101 2102 // Accessiblity constants for mPrivateFlags2 2103 2104 /** 2105 * Shift for the bits in {@link #mPrivateFlags2} related to the 2106 * "importantForAccessibility" attribute. 2107 */ 2108 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2109 2110 /** 2111 * Automatically determine whether a view is important for accessibility. 2112 */ 2113 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2114 2115 /** 2116 * The view is important for accessibility. 2117 */ 2118 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2119 2120 /** 2121 * The view is not important for accessibility. 2122 */ 2123 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2124 2125 /** 2126 * The default whether the view is important for accessibility. 2127 */ 2128 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2129 2130 /** 2131 * Mask for obtainig the bits which specify how to determine 2132 * whether a view is important for accessibility. 2133 */ 2134 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2135 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2136 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2137 2138 /** 2139 * Flag indicating whether a view has accessibility focus. 2140 */ 2141 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000; 2142 2143 /** 2144 * Flag whether the accessibility state of the subtree rooted at this view changed. 2145 */ 2146 static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000; 2147 2148 /** 2149 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2150 * is used to check whether later changes to the view's transform should invalidate the 2151 * view to force the quickReject test to run again. 2152 */ 2153 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2154 2155 /** 2156 * Flag indicating that start/end padding has been resolved into left/right padding 2157 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2158 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2159 * during measurement. In some special cases this is required such as when an adapter-based 2160 * view measures prospective children without attaching them to a window. 2161 */ 2162 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2163 2164 /** 2165 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2166 */ 2167 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2168 2169 /** 2170 * Group of bits indicating that RTL properties resolution is done. 2171 */ 2172 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2173 PFLAG2_TEXT_DIRECTION_RESOLVED | 2174 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2175 PFLAG2_PADDING_RESOLVED | 2176 PFLAG2_DRAWABLE_RESOLVED; 2177 2178 // There are a couple of flags left in mPrivateFlags2 2179 2180 /* End of masks for mPrivateFlags2 */ 2181 2182 /* Masks for mPrivateFlags3 */ 2183 2184 /** 2185 * Flag indicating that view has a transform animation set on it. This is used to track whether 2186 * an animation is cleared between successive frames, in order to tell the associated 2187 * DisplayList to clear its animation matrix. 2188 */ 2189 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2190 2191 /** 2192 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2193 * animation is cleared between successive frames, in order to tell the associated 2194 * DisplayList to restore its alpha value. 2195 */ 2196 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2197 2198 /** 2199 * Flag indicating that the view has been through at least one layout since it 2200 * was last attached to a window. 2201 */ 2202 static final int PFLAG3_IS_LAID_OUT = 0x4; 2203 2204 /** 2205 * Flag indicating that a call to measure() was skipped and should be done 2206 * instead when layout() is invoked. 2207 */ 2208 static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8; 2209 2210 2211 /* End of masks for mPrivateFlags3 */ 2212 2213 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2214 2215 /** 2216 * Always allow a user to over-scroll this view, provided it is a 2217 * view that can scroll. 2218 * 2219 * @see #getOverScrollMode() 2220 * @see #setOverScrollMode(int) 2221 */ 2222 public static final int OVER_SCROLL_ALWAYS = 0; 2223 2224 /** 2225 * Allow a user to over-scroll this view only if the content is large 2226 * enough to meaningfully scroll, provided it is a view that can scroll. 2227 * 2228 * @see #getOverScrollMode() 2229 * @see #setOverScrollMode(int) 2230 */ 2231 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2232 2233 /** 2234 * Never allow a user to over-scroll this view. 2235 * 2236 * @see #getOverScrollMode() 2237 * @see #setOverScrollMode(int) 2238 */ 2239 public static final int OVER_SCROLL_NEVER = 2; 2240 2241 /** 2242 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2243 * requested the system UI (status bar) to be visible (the default). 2244 * 2245 * @see #setSystemUiVisibility(int) 2246 */ 2247 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2248 2249 /** 2250 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2251 * system UI to enter an unobtrusive "low profile" mode. 2252 * 2253 * <p>This is for use in games, book readers, video players, or any other 2254 * "immersive" application where the usual system chrome is deemed too distracting. 2255 * 2256 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2257 * 2258 * @see #setSystemUiVisibility(int) 2259 */ 2260 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2261 2262 /** 2263 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2264 * system navigation be temporarily hidden. 2265 * 2266 * <p>This is an even less obtrusive state than that called for by 2267 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2268 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2269 * those to disappear. This is useful (in conjunction with the 2270 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2271 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2272 * window flags) for displaying content using every last pixel on the display. 2273 * 2274 * <p>There is a limitation: because navigation controls are so important, the least user 2275 * interaction will cause them to reappear immediately. When this happens, both 2276 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2277 * so that both elements reappear at the same time. 2278 * 2279 * @see #setSystemUiVisibility(int) 2280 */ 2281 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2282 2283 /** 2284 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2285 * into the normal fullscreen mode so that its content can take over the screen 2286 * while still allowing the user to interact with the application. 2287 * 2288 * <p>This has the same visual effect as 2289 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2290 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2291 * meaning that non-critical screen decorations (such as the status bar) will be 2292 * hidden while the user is in the View's window, focusing the experience on 2293 * that content. Unlike the window flag, if you are using ActionBar in 2294 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2295 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2296 * hide the action bar. 2297 * 2298 * <p>This approach to going fullscreen is best used over the window flag when 2299 * it is a transient state -- that is, the application does this at certain 2300 * points in its user interaction where it wants to allow the user to focus 2301 * on content, but not as a continuous state. For situations where the application 2302 * would like to simply stay full screen the entire time (such as a game that 2303 * wants to take over the screen), the 2304 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2305 * is usually a better approach. The state set here will be removed by the system 2306 * in various situations (such as the user moving to another application) like 2307 * the other system UI states. 2308 * 2309 * <p>When using this flag, the application should provide some easy facility 2310 * for the user to go out of it. A common example would be in an e-book 2311 * reader, where tapping on the screen brings back whatever screen and UI 2312 * decorations that had been hidden while the user was immersed in reading 2313 * the book. 2314 * 2315 * @see #setSystemUiVisibility(int) 2316 */ 2317 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2318 2319 /** 2320 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2321 * flags, we would like a stable view of the content insets given to 2322 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2323 * will always represent the worst case that the application can expect 2324 * as a continuous state. In the stock Android UI this is the space for 2325 * the system bar, nav bar, and status bar, but not more transient elements 2326 * such as an input method. 2327 * 2328 * The stable layout your UI sees is based on the system UI modes you can 2329 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2330 * then you will get a stable layout for changes of the 2331 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2332 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2333 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2334 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2335 * with a stable layout. (Note that you should avoid using 2336 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2337 * 2338 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2339 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2340 * then a hidden status bar will be considered a "stable" state for purposes 2341 * here. This allows your UI to continually hide the status bar, while still 2342 * using the system UI flags to hide the action bar while still retaining 2343 * a stable layout. Note that changing the window fullscreen flag will never 2344 * provide a stable layout for a clean transition. 2345 * 2346 * <p>If you are using ActionBar in 2347 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2348 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2349 * insets it adds to those given to the application. 2350 */ 2351 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2352 2353 /** 2354 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2355 * to be layed out as if it has requested 2356 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2357 * allows it to avoid artifacts when switching in and out of that mode, at 2358 * the expense that some of its user interface may be covered by screen 2359 * decorations when they are shown. You can perform layout of your inner 2360 * UI elements to account for the navigation system UI through the 2361 * {@link #fitSystemWindows(Rect)} method. 2362 */ 2363 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2364 2365 /** 2366 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2367 * to be layed out as if it has requested 2368 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2369 * allows it to avoid artifacts when switching in and out of that mode, at 2370 * the expense that some of its user interface may be covered by screen 2371 * decorations when they are shown. You can perform layout of your inner 2372 * UI elements to account for non-fullscreen system UI through the 2373 * {@link #fitSystemWindows(Rect)} method. 2374 */ 2375 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2376 2377 /** 2378 * Flag for {@link #setSystemUiVisibility(int)}: View would like to receive touch events 2379 * when hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the 2380 * navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} instead of having the system 2381 * clear these flags upon interaction. The system may compensate by temporarily overlaying 2382 * transparent system bars while also delivering the event. 2383 */ 2384 public static final int SYSTEM_UI_FLAG_ALLOW_TRANSIENT = 0x00000800; 2385 2386 /** 2387 * Flag for {@link #setSystemUiVisibility(int)}: View would like the status bar to have 2388 * transparency. 2389 * 2390 * <p>The transparency request may be denied if the bar is in another mode with a specific 2391 * style, like {@link #SYSTEM_UI_FLAG_ALLOW_TRANSIENT transient mode}. 2392 */ 2393 public static final int SYSTEM_UI_FLAG_TRANSPARENT_STATUS = 0x00001000; 2394 2395 /** 2396 * Flag for {@link #setSystemUiVisibility(int)}: View would like the navigation bar to have 2397 * transparency. 2398 * 2399 * <p>The transparency request may be denied if the bar is in another mode with a specific 2400 * style, like {@link #SYSTEM_UI_FLAG_ALLOW_TRANSIENT transient mode}. 2401 */ 2402 public static final int SYSTEM_UI_FLAG_TRANSPARENT_NAVIGATION = 0x00002000; 2403 2404 /** 2405 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2406 */ 2407 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2408 2409 /** 2410 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2411 */ 2412 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2413 2414 /** 2415 * @hide 2416 * 2417 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2418 * out of the public fields to keep the undefined bits out of the developer's way. 2419 * 2420 * Flag to make the status bar not expandable. Unless you also 2421 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2422 */ 2423 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2424 2425 /** 2426 * @hide 2427 * 2428 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2429 * out of the public fields to keep the undefined bits out of the developer's way. 2430 * 2431 * Flag to hide notification icons and scrolling ticker text. 2432 */ 2433 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2434 2435 /** 2436 * @hide 2437 * 2438 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2439 * out of the public fields to keep the undefined bits out of the developer's way. 2440 * 2441 * Flag to disable incoming notification alerts. This will not block 2442 * icons, but it will block sound, vibrating and other visual or aural notifications. 2443 */ 2444 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2445 2446 /** 2447 * @hide 2448 * 2449 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2450 * out of the public fields to keep the undefined bits out of the developer's way. 2451 * 2452 * Flag to hide only the scrolling ticker. Note that 2453 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2454 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2455 */ 2456 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2457 2458 /** 2459 * @hide 2460 * 2461 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2462 * out of the public fields to keep the undefined bits out of the developer's way. 2463 * 2464 * Flag to hide the center system info area. 2465 */ 2466 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2467 2468 /** 2469 * @hide 2470 * 2471 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2472 * out of the public fields to keep the undefined bits out of the developer's way. 2473 * 2474 * Flag to hide only the home button. Don't use this 2475 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2476 */ 2477 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2478 2479 /** 2480 * @hide 2481 * 2482 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2483 * out of the public fields to keep the undefined bits out of the developer's way. 2484 * 2485 * Flag to hide only the back button. Don't use this 2486 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2487 */ 2488 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2489 2490 /** 2491 * @hide 2492 * 2493 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2494 * out of the public fields to keep the undefined bits out of the developer's way. 2495 * 2496 * Flag to hide only the clock. You might use this if your activity has 2497 * its own clock making the status bar's clock redundant. 2498 */ 2499 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2500 2501 /** 2502 * @hide 2503 * 2504 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2505 * out of the public fields to keep the undefined bits out of the developer's way. 2506 * 2507 * Flag to hide only the recent apps button. Don't use this 2508 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2509 */ 2510 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2511 2512 /** 2513 * @hide 2514 * 2515 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2516 * out of the public fields to keep the undefined bits out of the developer's way. 2517 * 2518 * Flag to disable the global search gesture. Don't use this 2519 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2520 */ 2521 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2522 2523 /** 2524 * @hide 2525 * 2526 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2527 * out of the public fields to keep the undefined bits out of the developer's way. 2528 * 2529 * Flag to specify that the status bar is displayed in transient mode. 2530 */ 2531 public static final int STATUS_BAR_TRANSIENT = 0x04000000; 2532 2533 /** 2534 * @hide 2535 * 2536 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2537 * out of the public fields to keep the undefined bits out of the developer's way. 2538 * 2539 * Flag to specify that the navigation bar is displayed in transient mode. 2540 */ 2541 public static final int NAVIGATION_BAR_TRANSIENT = 0x08000000; 2542 2543 /** 2544 * @hide 2545 */ 2546 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2547 2548 /** 2549 * These are the system UI flags that can be cleared by events outside 2550 * of an application. Currently this is just the ability to tap on the 2551 * screen while hiding the navigation bar to have it return. 2552 * @hide 2553 */ 2554 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2555 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2556 | SYSTEM_UI_FLAG_FULLSCREEN; 2557 2558 /** 2559 * Flags that can impact the layout in relation to system UI. 2560 */ 2561 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2562 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2563 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2564 2565 /** 2566 * Find views that render the specified text. 2567 * 2568 * @see #findViewsWithText(ArrayList, CharSequence, int) 2569 */ 2570 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2571 2572 /** 2573 * Find find views that contain the specified content description. 2574 * 2575 * @see #findViewsWithText(ArrayList, CharSequence, int) 2576 */ 2577 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2578 2579 /** 2580 * Find views that contain {@link AccessibilityNodeProvider}. Such 2581 * a View is a root of virtual view hierarchy and may contain the searched 2582 * text. If this flag is set Views with providers are automatically 2583 * added and it is a responsibility of the client to call the APIs of 2584 * the provider to determine whether the virtual tree rooted at this View 2585 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2586 * represeting the virtual views with this text. 2587 * 2588 * @see #findViewsWithText(ArrayList, CharSequence, int) 2589 * 2590 * @hide 2591 */ 2592 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2593 2594 /** 2595 * The undefined cursor position. 2596 * 2597 * @hide 2598 */ 2599 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2600 2601 /** 2602 * Indicates that the screen has changed state and is now off. 2603 * 2604 * @see #onScreenStateChanged(int) 2605 */ 2606 public static final int SCREEN_STATE_OFF = 0x0; 2607 2608 /** 2609 * Indicates that the screen has changed state and is now on. 2610 * 2611 * @see #onScreenStateChanged(int) 2612 */ 2613 public static final int SCREEN_STATE_ON = 0x1; 2614 2615 /** 2616 * Controls the over-scroll mode for this view. 2617 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2618 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2619 * and {@link #OVER_SCROLL_NEVER}. 2620 */ 2621 private int mOverScrollMode; 2622 2623 /** 2624 * The parent this view is attached to. 2625 * {@hide} 2626 * 2627 * @see #getParent() 2628 */ 2629 protected ViewParent mParent; 2630 2631 /** 2632 * {@hide} 2633 */ 2634 AttachInfo mAttachInfo; 2635 2636 /** 2637 * {@hide} 2638 */ 2639 @ViewDebug.ExportedProperty(flagMapping = { 2640 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2641 name = "FORCE_LAYOUT"), 2642 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2643 name = "LAYOUT_REQUIRED"), 2644 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2645 name = "DRAWING_CACHE_INVALID", outputIf = false), 2646 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2647 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2648 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2649 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2650 }) 2651 int mPrivateFlags; 2652 int mPrivateFlags2; 2653 int mPrivateFlags3; 2654 2655 /** 2656 * This view's request for the visibility of the status bar. 2657 * @hide 2658 */ 2659 @ViewDebug.ExportedProperty(flagMapping = { 2660 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2661 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2662 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2663 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2664 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2665 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2666 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2667 equals = SYSTEM_UI_FLAG_VISIBLE, 2668 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2669 }) 2670 int mSystemUiVisibility; 2671 2672 /** 2673 * Reference count for transient state. 2674 * @see #setHasTransientState(boolean) 2675 */ 2676 int mTransientStateCount = 0; 2677 2678 /** 2679 * Count of how many windows this view has been attached to. 2680 */ 2681 int mWindowAttachCount; 2682 2683 /** 2684 * The layout parameters associated with this view and used by the parent 2685 * {@link android.view.ViewGroup} to determine how this view should be 2686 * laid out. 2687 * {@hide} 2688 */ 2689 protected ViewGroup.LayoutParams mLayoutParams; 2690 2691 /** 2692 * The view flags hold various views states. 2693 * {@hide} 2694 */ 2695 @ViewDebug.ExportedProperty 2696 int mViewFlags; 2697 2698 static class TransformationInfo { 2699 /** 2700 * The transform matrix for the View. This transform is calculated internally 2701 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2702 * is used by default. Do *not* use this variable directly; instead call 2703 * getMatrix(), which will automatically recalculate the matrix if necessary 2704 * to get the correct matrix based on the latest rotation and scale properties. 2705 */ 2706 private final Matrix mMatrix = new Matrix(); 2707 2708 /** 2709 * The transform matrix for the View. This transform is calculated internally 2710 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2711 * is used by default. Do *not* use this variable directly; instead call 2712 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2713 * to get the correct matrix based on the latest rotation and scale properties. 2714 */ 2715 private Matrix mInverseMatrix; 2716 2717 /** 2718 * An internal variable that tracks whether we need to recalculate the 2719 * transform matrix, based on whether the rotation or scaleX/Y properties 2720 * have changed since the matrix was last calculated. 2721 */ 2722 boolean mMatrixDirty = false; 2723 2724 /** 2725 * An internal variable that tracks whether we need to recalculate the 2726 * transform matrix, based on whether the rotation or scaleX/Y properties 2727 * have changed since the matrix was last calculated. 2728 */ 2729 private boolean mInverseMatrixDirty = true; 2730 2731 /** 2732 * A variable that tracks whether we need to recalculate the 2733 * transform matrix, based on whether the rotation or scaleX/Y properties 2734 * have changed since the matrix was last calculated. This variable 2735 * is only valid after a call to updateMatrix() or to a function that 2736 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2737 */ 2738 private boolean mMatrixIsIdentity = true; 2739 2740 /** 2741 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2742 */ 2743 private Camera mCamera = null; 2744 2745 /** 2746 * This matrix is used when computing the matrix for 3D rotations. 2747 */ 2748 private Matrix matrix3D = null; 2749 2750 /** 2751 * These prev values are used to recalculate a centered pivot point when necessary. The 2752 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2753 * set), so thes values are only used then as well. 2754 */ 2755 private int mPrevWidth = -1; 2756 private int mPrevHeight = -1; 2757 2758 /** 2759 * The degrees rotation around the vertical axis through the pivot point. 2760 */ 2761 @ViewDebug.ExportedProperty 2762 float mRotationY = 0f; 2763 2764 /** 2765 * The degrees rotation around the horizontal axis through the pivot point. 2766 */ 2767 @ViewDebug.ExportedProperty 2768 float mRotationX = 0f; 2769 2770 /** 2771 * The degrees rotation around the pivot point. 2772 */ 2773 @ViewDebug.ExportedProperty 2774 float mRotation = 0f; 2775 2776 /** 2777 * The amount of translation of the object away from its left property (post-layout). 2778 */ 2779 @ViewDebug.ExportedProperty 2780 float mTranslationX = 0f; 2781 2782 /** 2783 * The amount of translation of the object away from its top property (post-layout). 2784 */ 2785 @ViewDebug.ExportedProperty 2786 float mTranslationY = 0f; 2787 2788 /** 2789 * The amount of scale in the x direction around the pivot point. A 2790 * value of 1 means no scaling is applied. 2791 */ 2792 @ViewDebug.ExportedProperty 2793 float mScaleX = 1f; 2794 2795 /** 2796 * The amount of scale in the y direction around the pivot point. A 2797 * value of 1 means no scaling is applied. 2798 */ 2799 @ViewDebug.ExportedProperty 2800 float mScaleY = 1f; 2801 2802 /** 2803 * The x location of the point around which the view is rotated and scaled. 2804 */ 2805 @ViewDebug.ExportedProperty 2806 float mPivotX = 0f; 2807 2808 /** 2809 * The y location of the point around which the view is rotated and scaled. 2810 */ 2811 @ViewDebug.ExportedProperty 2812 float mPivotY = 0f; 2813 2814 /** 2815 * The opacity of the View. This is a value from 0 to 1, where 0 means 2816 * completely transparent and 1 means completely opaque. 2817 */ 2818 @ViewDebug.ExportedProperty 2819 float mAlpha = 1f; 2820 } 2821 2822 TransformationInfo mTransformationInfo; 2823 2824 /** 2825 * Current clip bounds. to which all drawing of this view are constrained. 2826 */ 2827 private Rect mClipBounds = null; 2828 2829 private boolean mLastIsOpaque; 2830 2831 /** 2832 * Convenience value to check for float values that are close enough to zero to be considered 2833 * zero. 2834 */ 2835 private static final float NONZERO_EPSILON = .001f; 2836 2837 /** 2838 * The distance in pixels from the left edge of this view's parent 2839 * to the left edge of this view. 2840 * {@hide} 2841 */ 2842 @ViewDebug.ExportedProperty(category = "layout") 2843 protected int mLeft; 2844 /** 2845 * The distance in pixels from the left edge of this view's parent 2846 * to the right edge of this view. 2847 * {@hide} 2848 */ 2849 @ViewDebug.ExportedProperty(category = "layout") 2850 protected int mRight; 2851 /** 2852 * The distance in pixels from the top edge of this view's parent 2853 * to the top edge of this view. 2854 * {@hide} 2855 */ 2856 @ViewDebug.ExportedProperty(category = "layout") 2857 protected int mTop; 2858 /** 2859 * The distance in pixels from the top edge of this view's parent 2860 * to the bottom edge of this view. 2861 * {@hide} 2862 */ 2863 @ViewDebug.ExportedProperty(category = "layout") 2864 protected int mBottom; 2865 2866 /** 2867 * The offset, in pixels, by which the content of this view is scrolled 2868 * horizontally. 2869 * {@hide} 2870 */ 2871 @ViewDebug.ExportedProperty(category = "scrolling") 2872 protected int mScrollX; 2873 /** 2874 * The offset, in pixels, by which the content of this view is scrolled 2875 * vertically. 2876 * {@hide} 2877 */ 2878 @ViewDebug.ExportedProperty(category = "scrolling") 2879 protected int mScrollY; 2880 2881 /** 2882 * The left padding in pixels, that is the distance in pixels between the 2883 * left edge of this view and the left edge of its content. 2884 * {@hide} 2885 */ 2886 @ViewDebug.ExportedProperty(category = "padding") 2887 protected int mPaddingLeft = 0; 2888 /** 2889 * The right padding in pixels, that is the distance in pixels between the 2890 * right edge of this view and the right edge of its content. 2891 * {@hide} 2892 */ 2893 @ViewDebug.ExportedProperty(category = "padding") 2894 protected int mPaddingRight = 0; 2895 /** 2896 * The top padding in pixels, that is the distance in pixels between the 2897 * top edge of this view and the top edge of its content. 2898 * {@hide} 2899 */ 2900 @ViewDebug.ExportedProperty(category = "padding") 2901 protected int mPaddingTop; 2902 /** 2903 * The bottom padding in pixels, that is the distance in pixels between the 2904 * bottom edge of this view and the bottom edge of its content. 2905 * {@hide} 2906 */ 2907 @ViewDebug.ExportedProperty(category = "padding") 2908 protected int mPaddingBottom; 2909 2910 /** 2911 * The layout insets in pixels, that is the distance in pixels between the 2912 * visible edges of this view its bounds. 2913 */ 2914 private Insets mLayoutInsets; 2915 2916 /** 2917 * Briefly describes the view and is primarily used for accessibility support. 2918 */ 2919 private CharSequence mContentDescription; 2920 2921 /** 2922 * Specifies the id of a view for which this view serves as a label for 2923 * accessibility purposes. 2924 */ 2925 private int mLabelForId = View.NO_ID; 2926 2927 /** 2928 * Predicate for matching labeled view id with its label for 2929 * accessibility purposes. 2930 */ 2931 private MatchLabelForPredicate mMatchLabelForPredicate; 2932 2933 /** 2934 * Predicate for matching a view by its id. 2935 */ 2936 private MatchIdPredicate mMatchIdPredicate; 2937 2938 /** 2939 * Cache the paddingRight set by the user to append to the scrollbar's size. 2940 * 2941 * @hide 2942 */ 2943 @ViewDebug.ExportedProperty(category = "padding") 2944 protected int mUserPaddingRight; 2945 2946 /** 2947 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2948 * 2949 * @hide 2950 */ 2951 @ViewDebug.ExportedProperty(category = "padding") 2952 protected int mUserPaddingBottom; 2953 2954 /** 2955 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2956 * 2957 * @hide 2958 */ 2959 @ViewDebug.ExportedProperty(category = "padding") 2960 protected int mUserPaddingLeft; 2961 2962 /** 2963 * Cache the paddingStart set by the user to append to the scrollbar's size. 2964 * 2965 */ 2966 @ViewDebug.ExportedProperty(category = "padding") 2967 int mUserPaddingStart; 2968 2969 /** 2970 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2971 * 2972 */ 2973 @ViewDebug.ExportedProperty(category = "padding") 2974 int mUserPaddingEnd; 2975 2976 /** 2977 * Cache initial left padding. 2978 * 2979 * @hide 2980 */ 2981 int mUserPaddingLeftInitial; 2982 2983 /** 2984 * Cache initial right padding. 2985 * 2986 * @hide 2987 */ 2988 int mUserPaddingRightInitial; 2989 2990 /** 2991 * Default undefined padding 2992 */ 2993 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 2994 2995 /** 2996 * @hide 2997 */ 2998 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2999 /** 3000 * @hide 3001 */ 3002 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 3003 3004 private LongSparseLongArray mMeasureCache; 3005 3006 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 3007 private Drawable mBackground; 3008 3009 private int mBackgroundResource; 3010 private boolean mBackgroundSizeChanged; 3011 3012 static class ListenerInfo { 3013 /** 3014 * Listener used to dispatch focus change events. 3015 * This field should be made private, so it is hidden from the SDK. 3016 * {@hide} 3017 */ 3018 protected OnFocusChangeListener mOnFocusChangeListener; 3019 3020 /** 3021 * Listeners for layout change events. 3022 */ 3023 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 3024 3025 /** 3026 * Listeners for attach events. 3027 */ 3028 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 3029 3030 /** 3031 * Listener used to dispatch click events. 3032 * This field should be made private, so it is hidden from the SDK. 3033 * {@hide} 3034 */ 3035 public OnClickListener mOnClickListener; 3036 3037 /** 3038 * Listener used to dispatch long click events. 3039 * This field should be made private, so it is hidden from the SDK. 3040 * {@hide} 3041 */ 3042 protected OnLongClickListener mOnLongClickListener; 3043 3044 /** 3045 * Listener used to build the context menu. 3046 * This field should be made private, so it is hidden from the SDK. 3047 * {@hide} 3048 */ 3049 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 3050 3051 private OnKeyListener mOnKeyListener; 3052 3053 private OnTouchListener mOnTouchListener; 3054 3055 private OnHoverListener mOnHoverListener; 3056 3057 private OnGenericMotionListener mOnGenericMotionListener; 3058 3059 private OnDragListener mOnDragListener; 3060 3061 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 3062 } 3063 3064 ListenerInfo mListenerInfo; 3065 3066 /** 3067 * The application environment this view lives in. 3068 * This field should be made private, so it is hidden from the SDK. 3069 * {@hide} 3070 */ 3071 protected Context mContext; 3072 3073 private final Resources mResources; 3074 3075 private ScrollabilityCache mScrollCache; 3076 3077 private int[] mDrawableState = null; 3078 3079 /** 3080 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3081 * the user may specify which view to go to next. 3082 */ 3083 private int mNextFocusLeftId = View.NO_ID; 3084 3085 /** 3086 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3087 * the user may specify which view to go to next. 3088 */ 3089 private int mNextFocusRightId = View.NO_ID; 3090 3091 /** 3092 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3093 * the user may specify which view to go to next. 3094 */ 3095 private int mNextFocusUpId = View.NO_ID; 3096 3097 /** 3098 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3099 * the user may specify which view to go to next. 3100 */ 3101 private int mNextFocusDownId = View.NO_ID; 3102 3103 /** 3104 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3105 * the user may specify which view to go to next. 3106 */ 3107 int mNextFocusForwardId = View.NO_ID; 3108 3109 private CheckForLongPress mPendingCheckForLongPress; 3110 private CheckForTap mPendingCheckForTap = null; 3111 private PerformClick mPerformClick; 3112 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3113 3114 private UnsetPressedState mUnsetPressedState; 3115 3116 /** 3117 * Whether the long press's action has been invoked. The tap's action is invoked on the 3118 * up event while a long press is invoked as soon as the long press duration is reached, so 3119 * a long press could be performed before the tap is checked, in which case the tap's action 3120 * should not be invoked. 3121 */ 3122 private boolean mHasPerformedLongPress; 3123 3124 /** 3125 * The minimum height of the view. We'll try our best to have the height 3126 * of this view to at least this amount. 3127 */ 3128 @ViewDebug.ExportedProperty(category = "measurement") 3129 private int mMinHeight; 3130 3131 /** 3132 * The minimum width of the view. We'll try our best to have the width 3133 * of this view to at least this amount. 3134 */ 3135 @ViewDebug.ExportedProperty(category = "measurement") 3136 private int mMinWidth; 3137 3138 /** 3139 * The delegate to handle touch events that are physically in this view 3140 * but should be handled by another view. 3141 */ 3142 private TouchDelegate mTouchDelegate = null; 3143 3144 /** 3145 * Solid color to use as a background when creating the drawing cache. Enables 3146 * the cache to use 16 bit bitmaps instead of 32 bit. 3147 */ 3148 private int mDrawingCacheBackgroundColor = 0; 3149 3150 /** 3151 * Special tree observer used when mAttachInfo is null. 3152 */ 3153 private ViewTreeObserver mFloatingTreeObserver; 3154 3155 /** 3156 * Cache the touch slop from the context that created the view. 3157 */ 3158 private int mTouchSlop; 3159 3160 /** 3161 * Object that handles automatic animation of view properties. 3162 */ 3163 private ViewPropertyAnimator mAnimator = null; 3164 3165 /** 3166 * Flag indicating that a drag can cross window boundaries. When 3167 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3168 * with this flag set, all visible applications will be able to participate 3169 * in the drag operation and receive the dragged content. 3170 * 3171 * @hide 3172 */ 3173 public static final int DRAG_FLAG_GLOBAL = 1; 3174 3175 /** 3176 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3177 */ 3178 private float mVerticalScrollFactor; 3179 3180 /** 3181 * Position of the vertical scroll bar. 3182 */ 3183 private int mVerticalScrollbarPosition; 3184 3185 /** 3186 * Position the scroll bar at the default position as determined by the system. 3187 */ 3188 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3189 3190 /** 3191 * Position the scroll bar along the left edge. 3192 */ 3193 public static final int SCROLLBAR_POSITION_LEFT = 1; 3194 3195 /** 3196 * Position the scroll bar along the right edge. 3197 */ 3198 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3199 3200 /** 3201 * Indicates that the view does not have a layer. 3202 * 3203 * @see #getLayerType() 3204 * @see #setLayerType(int, android.graphics.Paint) 3205 * @see #LAYER_TYPE_SOFTWARE 3206 * @see #LAYER_TYPE_HARDWARE 3207 */ 3208 public static final int LAYER_TYPE_NONE = 0; 3209 3210 /** 3211 * <p>Indicates that the view has a software layer. A software layer is backed 3212 * by a bitmap and causes the view to be rendered using Android's software 3213 * rendering pipeline, even if hardware acceleration is enabled.</p> 3214 * 3215 * <p>Software layers have various usages:</p> 3216 * <p>When the application is not using hardware acceleration, a software layer 3217 * is useful to apply a specific color filter and/or blending mode and/or 3218 * translucency to a view and all its children.</p> 3219 * <p>When the application is using hardware acceleration, a software layer 3220 * is useful to render drawing primitives not supported by the hardware 3221 * accelerated pipeline. It can also be used to cache a complex view tree 3222 * into a texture and reduce the complexity of drawing operations. For instance, 3223 * when animating a complex view tree with a translation, a software layer can 3224 * be used to render the view tree only once.</p> 3225 * <p>Software layers should be avoided when the affected view tree updates 3226 * often. Every update will require to re-render the software layer, which can 3227 * potentially be slow (particularly when hardware acceleration is turned on 3228 * since the layer will have to be uploaded into a hardware texture after every 3229 * update.)</p> 3230 * 3231 * @see #getLayerType() 3232 * @see #setLayerType(int, android.graphics.Paint) 3233 * @see #LAYER_TYPE_NONE 3234 * @see #LAYER_TYPE_HARDWARE 3235 */ 3236 public static final int LAYER_TYPE_SOFTWARE = 1; 3237 3238 /** 3239 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3240 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3241 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3242 * rendering pipeline, but only if hardware acceleration is turned on for the 3243 * view hierarchy. When hardware acceleration is turned off, hardware layers 3244 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3245 * 3246 * <p>A hardware layer is useful to apply a specific color filter and/or 3247 * blending mode and/or translucency to a view and all its children.</p> 3248 * <p>A hardware layer can be used to cache a complex view tree into a 3249 * texture and reduce the complexity of drawing operations. For instance, 3250 * when animating a complex view tree with a translation, a hardware layer can 3251 * be used to render the view tree only once.</p> 3252 * <p>A hardware layer can also be used to increase the rendering quality when 3253 * rotation transformations are applied on a view. It can also be used to 3254 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3255 * 3256 * @see #getLayerType() 3257 * @see #setLayerType(int, android.graphics.Paint) 3258 * @see #LAYER_TYPE_NONE 3259 * @see #LAYER_TYPE_SOFTWARE 3260 */ 3261 public static final int LAYER_TYPE_HARDWARE = 2; 3262 3263 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3264 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3265 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3266 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3267 }) 3268 int mLayerType = LAYER_TYPE_NONE; 3269 Paint mLayerPaint; 3270 Rect mLocalDirtyRect; 3271 private HardwareLayer mHardwareLayer; 3272 3273 /** 3274 * Set to true when drawing cache is enabled and cannot be created. 3275 * 3276 * @hide 3277 */ 3278 public boolean mCachingFailed; 3279 private Bitmap mDrawingCache; 3280 private Bitmap mUnscaledDrawingCache; 3281 3282 DisplayList mDisplayList; 3283 3284 /** 3285 * Set to true when the view is sending hover accessibility events because it 3286 * is the innermost hovered view. 3287 */ 3288 private boolean mSendingHoverAccessibilityEvents; 3289 3290 /** 3291 * Delegate for injecting accessibility functionality. 3292 */ 3293 AccessibilityDelegate mAccessibilityDelegate; 3294 3295 /** 3296 * The view's overlay layer. Developers get a reference to the overlay via getOverlay() 3297 * and add/remove objects to/from the overlay directly through the Overlay methods. 3298 */ 3299 ViewOverlay mOverlay; 3300 3301 /** 3302 * Consistency verifier for debugging purposes. 3303 * @hide 3304 */ 3305 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3306 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3307 new InputEventConsistencyVerifier(this, 0) : null; 3308 3309 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3310 3311 /** 3312 * Simple constructor to use when creating a view from code. 3313 * 3314 * @param context The Context the view is running in, through which it can 3315 * access the current theme, resources, etc. 3316 */ 3317 public View(Context context) { 3318 mContext = context; 3319 mResources = context != null ? context.getResources() : null; 3320 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3321 // Set some flags defaults 3322 mPrivateFlags2 = 3323 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3324 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3325 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3326 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3327 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3328 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3329 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3330 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3331 mUserPaddingStart = UNDEFINED_PADDING; 3332 mUserPaddingEnd = UNDEFINED_PADDING; 3333 3334 if (!sUseBrokenMakeMeasureSpec && context != null && 3335 context.getApplicationInfo().targetSdkVersion <= JELLY_BEAN_MR1) { 3336 // Older apps may need this compatibility hack for measurement. 3337 sUseBrokenMakeMeasureSpec = true; 3338 } 3339 } 3340 3341 /** 3342 * Constructor that is called when inflating a view from XML. This is called 3343 * when a view is being constructed from an XML file, supplying attributes 3344 * that were specified in the XML file. This version uses a default style of 3345 * 0, so the only attribute values applied are those in the Context's Theme 3346 * and the given AttributeSet. 3347 * 3348 * <p> 3349 * The method onFinishInflate() will be called after all children have been 3350 * added. 3351 * 3352 * @param context The Context the view is running in, through which it can 3353 * access the current theme, resources, etc. 3354 * @param attrs The attributes of the XML tag that is inflating the view. 3355 * @see #View(Context, AttributeSet, int) 3356 */ 3357 public View(Context context, AttributeSet attrs) { 3358 this(context, attrs, 0); 3359 } 3360 3361 /** 3362 * Perform inflation from XML and apply a class-specific base style. This 3363 * constructor of View allows subclasses to use their own base style when 3364 * they are inflating. For example, a Button class's constructor would call 3365 * this version of the super class constructor and supply 3366 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3367 * the theme's button style to modify all of the base view attributes (in 3368 * particular its background) as well as the Button class's attributes. 3369 * 3370 * @param context The Context the view is running in, through which it can 3371 * access the current theme, resources, etc. 3372 * @param attrs The attributes of the XML tag that is inflating the view. 3373 * @param defStyle The default style to apply to this view. If 0, no style 3374 * will be applied (beyond what is included in the theme). This may 3375 * either be an attribute resource, whose value will be retrieved 3376 * from the current theme, or an explicit style resource. 3377 * @see #View(Context, AttributeSet) 3378 */ 3379 public View(Context context, AttributeSet attrs, int defStyle) { 3380 this(context); 3381 3382 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3383 defStyle, 0); 3384 3385 Drawable background = null; 3386 3387 int leftPadding = -1; 3388 int topPadding = -1; 3389 int rightPadding = -1; 3390 int bottomPadding = -1; 3391 int startPadding = UNDEFINED_PADDING; 3392 int endPadding = UNDEFINED_PADDING; 3393 3394 int padding = -1; 3395 3396 int viewFlagValues = 0; 3397 int viewFlagMasks = 0; 3398 3399 boolean setScrollContainer = false; 3400 3401 int x = 0; 3402 int y = 0; 3403 3404 float tx = 0; 3405 float ty = 0; 3406 float rotation = 0; 3407 float rotationX = 0; 3408 float rotationY = 0; 3409 float sx = 1f; 3410 float sy = 1f; 3411 boolean transformSet = false; 3412 3413 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3414 int overScrollMode = mOverScrollMode; 3415 boolean initializeScrollbars = false; 3416 3417 boolean leftPaddingDefined = false; 3418 boolean rightPaddingDefined = false; 3419 boolean startPaddingDefined = false; 3420 boolean endPaddingDefined = false; 3421 3422 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3423 3424 final int N = a.getIndexCount(); 3425 for (int i = 0; i < N; i++) { 3426 int attr = a.getIndex(i); 3427 switch (attr) { 3428 case com.android.internal.R.styleable.View_background: 3429 background = a.getDrawable(attr); 3430 break; 3431 case com.android.internal.R.styleable.View_padding: 3432 padding = a.getDimensionPixelSize(attr, -1); 3433 mUserPaddingLeftInitial = padding; 3434 mUserPaddingRightInitial = padding; 3435 leftPaddingDefined = true; 3436 rightPaddingDefined = true; 3437 break; 3438 case com.android.internal.R.styleable.View_paddingLeft: 3439 leftPadding = a.getDimensionPixelSize(attr, -1); 3440 mUserPaddingLeftInitial = leftPadding; 3441 leftPaddingDefined = true; 3442 break; 3443 case com.android.internal.R.styleable.View_paddingTop: 3444 topPadding = a.getDimensionPixelSize(attr, -1); 3445 break; 3446 case com.android.internal.R.styleable.View_paddingRight: 3447 rightPadding = a.getDimensionPixelSize(attr, -1); 3448 mUserPaddingRightInitial = rightPadding; 3449 rightPaddingDefined = true; 3450 break; 3451 case com.android.internal.R.styleable.View_paddingBottom: 3452 bottomPadding = a.getDimensionPixelSize(attr, -1); 3453 break; 3454 case com.android.internal.R.styleable.View_paddingStart: 3455 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3456 startPaddingDefined = (startPadding != UNDEFINED_PADDING); 3457 break; 3458 case com.android.internal.R.styleable.View_paddingEnd: 3459 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3460 endPaddingDefined = (endPadding != UNDEFINED_PADDING); 3461 break; 3462 case com.android.internal.R.styleable.View_scrollX: 3463 x = a.getDimensionPixelOffset(attr, 0); 3464 break; 3465 case com.android.internal.R.styleable.View_scrollY: 3466 y = a.getDimensionPixelOffset(attr, 0); 3467 break; 3468 case com.android.internal.R.styleable.View_alpha: 3469 setAlpha(a.getFloat(attr, 1f)); 3470 break; 3471 case com.android.internal.R.styleable.View_transformPivotX: 3472 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3473 break; 3474 case com.android.internal.R.styleable.View_transformPivotY: 3475 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3476 break; 3477 case com.android.internal.R.styleable.View_translationX: 3478 tx = a.getDimensionPixelOffset(attr, 0); 3479 transformSet = true; 3480 break; 3481 case com.android.internal.R.styleable.View_translationY: 3482 ty = a.getDimensionPixelOffset(attr, 0); 3483 transformSet = true; 3484 break; 3485 case com.android.internal.R.styleable.View_rotation: 3486 rotation = a.getFloat(attr, 0); 3487 transformSet = true; 3488 break; 3489 case com.android.internal.R.styleable.View_rotationX: 3490 rotationX = a.getFloat(attr, 0); 3491 transformSet = true; 3492 break; 3493 case com.android.internal.R.styleable.View_rotationY: 3494 rotationY = a.getFloat(attr, 0); 3495 transformSet = true; 3496 break; 3497 case com.android.internal.R.styleable.View_scaleX: 3498 sx = a.getFloat(attr, 1f); 3499 transformSet = true; 3500 break; 3501 case com.android.internal.R.styleable.View_scaleY: 3502 sy = a.getFloat(attr, 1f); 3503 transformSet = true; 3504 break; 3505 case com.android.internal.R.styleable.View_id: 3506 mID = a.getResourceId(attr, NO_ID); 3507 break; 3508 case com.android.internal.R.styleable.View_tag: 3509 mTag = a.getText(attr); 3510 break; 3511 case com.android.internal.R.styleable.View_fitsSystemWindows: 3512 if (a.getBoolean(attr, false)) { 3513 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3514 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3515 } 3516 break; 3517 case com.android.internal.R.styleable.View_focusable: 3518 if (a.getBoolean(attr, false)) { 3519 viewFlagValues |= FOCUSABLE; 3520 viewFlagMasks |= FOCUSABLE_MASK; 3521 } 3522 break; 3523 case com.android.internal.R.styleable.View_focusableInTouchMode: 3524 if (a.getBoolean(attr, false)) { 3525 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3526 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3527 } 3528 break; 3529 case com.android.internal.R.styleable.View_clickable: 3530 if (a.getBoolean(attr, false)) { 3531 viewFlagValues |= CLICKABLE; 3532 viewFlagMasks |= CLICKABLE; 3533 } 3534 break; 3535 case com.android.internal.R.styleable.View_longClickable: 3536 if (a.getBoolean(attr, false)) { 3537 viewFlagValues |= LONG_CLICKABLE; 3538 viewFlagMasks |= LONG_CLICKABLE; 3539 } 3540 break; 3541 case com.android.internal.R.styleable.View_saveEnabled: 3542 if (!a.getBoolean(attr, true)) { 3543 viewFlagValues |= SAVE_DISABLED; 3544 viewFlagMasks |= SAVE_DISABLED_MASK; 3545 } 3546 break; 3547 case com.android.internal.R.styleable.View_duplicateParentState: 3548 if (a.getBoolean(attr, false)) { 3549 viewFlagValues |= DUPLICATE_PARENT_STATE; 3550 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3551 } 3552 break; 3553 case com.android.internal.R.styleable.View_visibility: 3554 final int visibility = a.getInt(attr, 0); 3555 if (visibility != 0) { 3556 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3557 viewFlagMasks |= VISIBILITY_MASK; 3558 } 3559 break; 3560 case com.android.internal.R.styleable.View_layoutDirection: 3561 // Clear any layout direction flags (included resolved bits) already set 3562 mPrivateFlags2 &= 3563 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3564 // Set the layout direction flags depending on the value of the attribute 3565 final int layoutDirection = a.getInt(attr, -1); 3566 final int value = (layoutDirection != -1) ? 3567 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3568 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3569 break; 3570 case com.android.internal.R.styleable.View_drawingCacheQuality: 3571 final int cacheQuality = a.getInt(attr, 0); 3572 if (cacheQuality != 0) { 3573 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3574 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3575 } 3576 break; 3577 case com.android.internal.R.styleable.View_contentDescription: 3578 setContentDescription(a.getString(attr)); 3579 break; 3580 case com.android.internal.R.styleable.View_labelFor: 3581 setLabelFor(a.getResourceId(attr, NO_ID)); 3582 break; 3583 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3584 if (!a.getBoolean(attr, true)) { 3585 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3586 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3587 } 3588 break; 3589 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3590 if (!a.getBoolean(attr, true)) { 3591 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3592 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3593 } 3594 break; 3595 case R.styleable.View_scrollbars: 3596 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3597 if (scrollbars != SCROLLBARS_NONE) { 3598 viewFlagValues |= scrollbars; 3599 viewFlagMasks |= SCROLLBARS_MASK; 3600 initializeScrollbars = true; 3601 } 3602 break; 3603 //noinspection deprecation 3604 case R.styleable.View_fadingEdge: 3605 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3606 // Ignore the attribute starting with ICS 3607 break; 3608 } 3609 // With builds < ICS, fall through and apply fading edges 3610 case R.styleable.View_requiresFadingEdge: 3611 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3612 if (fadingEdge != FADING_EDGE_NONE) { 3613 viewFlagValues |= fadingEdge; 3614 viewFlagMasks |= FADING_EDGE_MASK; 3615 initializeFadingEdge(a); 3616 } 3617 break; 3618 case R.styleable.View_scrollbarStyle: 3619 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3620 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3621 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3622 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3623 } 3624 break; 3625 case R.styleable.View_isScrollContainer: 3626 setScrollContainer = true; 3627 if (a.getBoolean(attr, false)) { 3628 setScrollContainer(true); 3629 } 3630 break; 3631 case com.android.internal.R.styleable.View_keepScreenOn: 3632 if (a.getBoolean(attr, false)) { 3633 viewFlagValues |= KEEP_SCREEN_ON; 3634 viewFlagMasks |= KEEP_SCREEN_ON; 3635 } 3636 break; 3637 case R.styleable.View_filterTouchesWhenObscured: 3638 if (a.getBoolean(attr, false)) { 3639 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3640 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3641 } 3642 break; 3643 case R.styleable.View_nextFocusLeft: 3644 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3645 break; 3646 case R.styleable.View_nextFocusRight: 3647 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3648 break; 3649 case R.styleable.View_nextFocusUp: 3650 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3651 break; 3652 case R.styleable.View_nextFocusDown: 3653 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3654 break; 3655 case R.styleable.View_nextFocusForward: 3656 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3657 break; 3658 case R.styleable.View_minWidth: 3659 mMinWidth = a.getDimensionPixelSize(attr, 0); 3660 break; 3661 case R.styleable.View_minHeight: 3662 mMinHeight = a.getDimensionPixelSize(attr, 0); 3663 break; 3664 case R.styleable.View_onClick: 3665 if (context.isRestricted()) { 3666 throw new IllegalStateException("The android:onClick attribute cannot " 3667 + "be used within a restricted context"); 3668 } 3669 3670 final String handlerName = a.getString(attr); 3671 if (handlerName != null) { 3672 setOnClickListener(new OnClickListener() { 3673 private Method mHandler; 3674 3675 public void onClick(View v) { 3676 if (mHandler == null) { 3677 try { 3678 mHandler = getContext().getClass().getMethod(handlerName, 3679 View.class); 3680 } catch (NoSuchMethodException e) { 3681 int id = getId(); 3682 String idText = id == NO_ID ? "" : " with id '" 3683 + getContext().getResources().getResourceEntryName( 3684 id) + "'"; 3685 throw new IllegalStateException("Could not find a method " + 3686 handlerName + "(View) in the activity " 3687 + getContext().getClass() + " for onClick handler" 3688 + " on view " + View.this.getClass() + idText, e); 3689 } 3690 } 3691 3692 try { 3693 mHandler.invoke(getContext(), View.this); 3694 } catch (IllegalAccessException e) { 3695 throw new IllegalStateException("Could not execute non " 3696 + "public method of the activity", e); 3697 } catch (InvocationTargetException e) { 3698 throw new IllegalStateException("Could not execute " 3699 + "method of the activity", e); 3700 } 3701 } 3702 }); 3703 } 3704 break; 3705 case R.styleable.View_overScrollMode: 3706 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3707 break; 3708 case R.styleable.View_verticalScrollbarPosition: 3709 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3710 break; 3711 case R.styleable.View_layerType: 3712 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3713 break; 3714 case R.styleable.View_textDirection: 3715 // Clear any text direction flag already set 3716 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3717 // Set the text direction flags depending on the value of the attribute 3718 final int textDirection = a.getInt(attr, -1); 3719 if (textDirection != -1) { 3720 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3721 } 3722 break; 3723 case R.styleable.View_textAlignment: 3724 // Clear any text alignment flag already set 3725 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3726 // Set the text alignment flag depending on the value of the attribute 3727 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3728 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3729 break; 3730 case R.styleable.View_importantForAccessibility: 3731 setImportantForAccessibility(a.getInt(attr, 3732 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3733 break; 3734 } 3735 } 3736 3737 setOverScrollMode(overScrollMode); 3738 3739 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3740 // the resolved layout direction). Those cached values will be used later during padding 3741 // resolution. 3742 mUserPaddingStart = startPadding; 3743 mUserPaddingEnd = endPadding; 3744 3745 if (background != null) { 3746 setBackground(background); 3747 } 3748 3749 if (padding >= 0) { 3750 leftPadding = padding; 3751 topPadding = padding; 3752 rightPadding = padding; 3753 bottomPadding = padding; 3754 mUserPaddingLeftInitial = padding; 3755 mUserPaddingRightInitial = padding; 3756 } 3757 3758 if (isRtlCompatibilityMode()) { 3759 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3760 // left / right padding are used if defined (meaning here nothing to do). If they are not 3761 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3762 // start / end and resolve them as left / right (layout direction is not taken into account). 3763 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3764 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3765 // defined. 3766 if (!leftPaddingDefined && startPaddingDefined) { 3767 leftPadding = startPadding; 3768 } 3769 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3770 if (!rightPaddingDefined && endPaddingDefined) { 3771 rightPadding = endPadding; 3772 } 3773 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3774 } else { 3775 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3776 // values defined. Otherwise, left /right values are used. 3777 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3778 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3779 // defined. 3780 final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined; 3781 3782 if (leftPaddingDefined && !hasRelativePadding) { 3783 mUserPaddingLeftInitial = leftPadding; 3784 } 3785 if (rightPaddingDefined && !hasRelativePadding) { 3786 mUserPaddingRightInitial = rightPadding; 3787 } 3788 } 3789 3790 internalSetPadding( 3791 mUserPaddingLeftInitial, 3792 topPadding >= 0 ? topPadding : mPaddingTop, 3793 mUserPaddingRightInitial, 3794 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3795 3796 if (viewFlagMasks != 0) { 3797 setFlags(viewFlagValues, viewFlagMasks); 3798 } 3799 3800 if (initializeScrollbars) { 3801 initializeScrollbars(a); 3802 } 3803 3804 a.recycle(); 3805 3806 // Needs to be called after mViewFlags is set 3807 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3808 recomputePadding(); 3809 } 3810 3811 if (x != 0 || y != 0) { 3812 scrollTo(x, y); 3813 } 3814 3815 if (transformSet) { 3816 setTranslationX(tx); 3817 setTranslationY(ty); 3818 setRotation(rotation); 3819 setRotationX(rotationX); 3820 setRotationY(rotationY); 3821 setScaleX(sx); 3822 setScaleY(sy); 3823 } 3824 3825 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3826 setScrollContainer(true); 3827 } 3828 3829 computeOpaqueFlags(); 3830 } 3831 3832 /** 3833 * Non-public constructor for use in testing 3834 */ 3835 View() { 3836 mResources = null; 3837 } 3838 3839 public String toString() { 3840 StringBuilder out = new StringBuilder(128); 3841 out.append(getClass().getName()); 3842 out.append('{'); 3843 out.append(Integer.toHexString(System.identityHashCode(this))); 3844 out.append(' '); 3845 switch (mViewFlags&VISIBILITY_MASK) { 3846 case VISIBLE: out.append('V'); break; 3847 case INVISIBLE: out.append('I'); break; 3848 case GONE: out.append('G'); break; 3849 default: out.append('.'); break; 3850 } 3851 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3852 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3853 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3854 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3855 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3856 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3857 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3858 out.append(' '); 3859 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3860 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3861 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3862 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3863 out.append('p'); 3864 } else { 3865 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3866 } 3867 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3868 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3869 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3870 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3871 out.append(' '); 3872 out.append(mLeft); 3873 out.append(','); 3874 out.append(mTop); 3875 out.append('-'); 3876 out.append(mRight); 3877 out.append(','); 3878 out.append(mBottom); 3879 final int id = getId(); 3880 if (id != NO_ID) { 3881 out.append(" #"); 3882 out.append(Integer.toHexString(id)); 3883 final Resources r = mResources; 3884 if (id != 0 && r != null) { 3885 try { 3886 String pkgname; 3887 switch (id&0xff000000) { 3888 case 0x7f000000: 3889 pkgname="app"; 3890 break; 3891 case 0x01000000: 3892 pkgname="android"; 3893 break; 3894 default: 3895 pkgname = r.getResourcePackageName(id); 3896 break; 3897 } 3898 String typename = r.getResourceTypeName(id); 3899 String entryname = r.getResourceEntryName(id); 3900 out.append(" "); 3901 out.append(pkgname); 3902 out.append(":"); 3903 out.append(typename); 3904 out.append("/"); 3905 out.append(entryname); 3906 } catch (Resources.NotFoundException e) { 3907 } 3908 } 3909 } 3910 out.append("}"); 3911 return out.toString(); 3912 } 3913 3914 /** 3915 * <p> 3916 * Initializes the fading edges from a given set of styled attributes. This 3917 * method should be called by subclasses that need fading edges and when an 3918 * instance of these subclasses is created programmatically rather than 3919 * being inflated from XML. This method is automatically called when the XML 3920 * is inflated. 3921 * </p> 3922 * 3923 * @param a the styled attributes set to initialize the fading edges from 3924 */ 3925 protected void initializeFadingEdge(TypedArray a) { 3926 initScrollCache(); 3927 3928 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3929 R.styleable.View_fadingEdgeLength, 3930 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3931 } 3932 3933 /** 3934 * Returns the size of the vertical faded edges used to indicate that more 3935 * content in this view is visible. 3936 * 3937 * @return The size in pixels of the vertical faded edge or 0 if vertical 3938 * faded edges are not enabled for this view. 3939 * @attr ref android.R.styleable#View_fadingEdgeLength 3940 */ 3941 public int getVerticalFadingEdgeLength() { 3942 if (isVerticalFadingEdgeEnabled()) { 3943 ScrollabilityCache cache = mScrollCache; 3944 if (cache != null) { 3945 return cache.fadingEdgeLength; 3946 } 3947 } 3948 return 0; 3949 } 3950 3951 /** 3952 * Set the size of the faded edge used to indicate that more content in this 3953 * view is available. Will not change whether the fading edge is enabled; use 3954 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3955 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3956 * for the vertical or horizontal fading edges. 3957 * 3958 * @param length The size in pixels of the faded edge used to indicate that more 3959 * content in this view is visible. 3960 */ 3961 public void setFadingEdgeLength(int length) { 3962 initScrollCache(); 3963 mScrollCache.fadingEdgeLength = length; 3964 } 3965 3966 /** 3967 * Returns the size of the horizontal faded edges used to indicate that more 3968 * content in this view is visible. 3969 * 3970 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3971 * faded edges are not enabled for this view. 3972 * @attr ref android.R.styleable#View_fadingEdgeLength 3973 */ 3974 public int getHorizontalFadingEdgeLength() { 3975 if (isHorizontalFadingEdgeEnabled()) { 3976 ScrollabilityCache cache = mScrollCache; 3977 if (cache != null) { 3978 return cache.fadingEdgeLength; 3979 } 3980 } 3981 return 0; 3982 } 3983 3984 /** 3985 * Returns the width of the vertical scrollbar. 3986 * 3987 * @return The width in pixels of the vertical scrollbar or 0 if there 3988 * is no vertical scrollbar. 3989 */ 3990 public int getVerticalScrollbarWidth() { 3991 ScrollabilityCache cache = mScrollCache; 3992 if (cache != null) { 3993 ScrollBarDrawable scrollBar = cache.scrollBar; 3994 if (scrollBar != null) { 3995 int size = scrollBar.getSize(true); 3996 if (size <= 0) { 3997 size = cache.scrollBarSize; 3998 } 3999 return size; 4000 } 4001 return 0; 4002 } 4003 return 0; 4004 } 4005 4006 /** 4007 * Returns the height of the horizontal scrollbar. 4008 * 4009 * @return The height in pixels of the horizontal scrollbar or 0 if 4010 * there is no horizontal scrollbar. 4011 */ 4012 protected int getHorizontalScrollbarHeight() { 4013 ScrollabilityCache cache = mScrollCache; 4014 if (cache != null) { 4015 ScrollBarDrawable scrollBar = cache.scrollBar; 4016 if (scrollBar != null) { 4017 int size = scrollBar.getSize(false); 4018 if (size <= 0) { 4019 size = cache.scrollBarSize; 4020 } 4021 return size; 4022 } 4023 return 0; 4024 } 4025 return 0; 4026 } 4027 4028 /** 4029 * <p> 4030 * Initializes the scrollbars from a given set of styled attributes. This 4031 * method should be called by subclasses that need scrollbars and when an 4032 * instance of these subclasses is created programmatically rather than 4033 * being inflated from XML. This method is automatically called when the XML 4034 * is inflated. 4035 * </p> 4036 * 4037 * @param a the styled attributes set to initialize the scrollbars from 4038 */ 4039 protected void initializeScrollbars(TypedArray a) { 4040 initScrollCache(); 4041 4042 final ScrollabilityCache scrollabilityCache = mScrollCache; 4043 4044 if (scrollabilityCache.scrollBar == null) { 4045 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 4046 } 4047 4048 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 4049 4050 if (!fadeScrollbars) { 4051 scrollabilityCache.state = ScrollabilityCache.ON; 4052 } 4053 scrollabilityCache.fadeScrollBars = fadeScrollbars; 4054 4055 4056 scrollabilityCache.scrollBarFadeDuration = a.getInt( 4057 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 4058 .getScrollBarFadeDuration()); 4059 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 4060 R.styleable.View_scrollbarDefaultDelayBeforeFade, 4061 ViewConfiguration.getScrollDefaultDelay()); 4062 4063 4064 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 4065 com.android.internal.R.styleable.View_scrollbarSize, 4066 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 4067 4068 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 4069 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 4070 4071 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 4072 if (thumb != null) { 4073 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 4074 } 4075 4076 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 4077 false); 4078 if (alwaysDraw) { 4079 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4080 } 4081 4082 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4083 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4084 4085 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4086 if (thumb != null) { 4087 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4088 } 4089 4090 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4091 false); 4092 if (alwaysDraw) { 4093 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4094 } 4095 4096 // Apply layout direction to the new Drawables if needed 4097 final int layoutDirection = getLayoutDirection(); 4098 if (track != null) { 4099 track.setLayoutDirection(layoutDirection); 4100 } 4101 if (thumb != null) { 4102 thumb.setLayoutDirection(layoutDirection); 4103 } 4104 4105 // Re-apply user/background padding so that scrollbar(s) get added 4106 resolvePadding(); 4107 } 4108 4109 /** 4110 * <p> 4111 * Initalizes the scrollability cache if necessary. 4112 * </p> 4113 */ 4114 private void initScrollCache() { 4115 if (mScrollCache == null) { 4116 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4117 } 4118 } 4119 4120 private ScrollabilityCache getScrollCache() { 4121 initScrollCache(); 4122 return mScrollCache; 4123 } 4124 4125 /** 4126 * Set the position of the vertical scroll bar. Should be one of 4127 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4128 * {@link #SCROLLBAR_POSITION_RIGHT}. 4129 * 4130 * @param position Where the vertical scroll bar should be positioned. 4131 */ 4132 public void setVerticalScrollbarPosition(int position) { 4133 if (mVerticalScrollbarPosition != position) { 4134 mVerticalScrollbarPosition = position; 4135 computeOpaqueFlags(); 4136 resolvePadding(); 4137 } 4138 } 4139 4140 /** 4141 * @return The position where the vertical scroll bar will show, if applicable. 4142 * @see #setVerticalScrollbarPosition(int) 4143 */ 4144 public int getVerticalScrollbarPosition() { 4145 return mVerticalScrollbarPosition; 4146 } 4147 4148 ListenerInfo getListenerInfo() { 4149 if (mListenerInfo != null) { 4150 return mListenerInfo; 4151 } 4152 mListenerInfo = new ListenerInfo(); 4153 return mListenerInfo; 4154 } 4155 4156 /** 4157 * Register a callback to be invoked when focus of this view changed. 4158 * 4159 * @param l The callback that will run. 4160 */ 4161 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4162 getListenerInfo().mOnFocusChangeListener = l; 4163 } 4164 4165 /** 4166 * Add a listener that will be called when the bounds of the view change due to 4167 * layout processing. 4168 * 4169 * @param listener The listener that will be called when layout bounds change. 4170 */ 4171 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4172 ListenerInfo li = getListenerInfo(); 4173 if (li.mOnLayoutChangeListeners == null) { 4174 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4175 } 4176 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4177 li.mOnLayoutChangeListeners.add(listener); 4178 } 4179 } 4180 4181 /** 4182 * Remove a listener for layout changes. 4183 * 4184 * @param listener The listener for layout bounds change. 4185 */ 4186 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4187 ListenerInfo li = mListenerInfo; 4188 if (li == null || li.mOnLayoutChangeListeners == null) { 4189 return; 4190 } 4191 li.mOnLayoutChangeListeners.remove(listener); 4192 } 4193 4194 /** 4195 * Add a listener for attach state changes. 4196 * 4197 * This listener will be called whenever this view is attached or detached 4198 * from a window. Remove the listener using 4199 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4200 * 4201 * @param listener Listener to attach 4202 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4203 */ 4204 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4205 ListenerInfo li = getListenerInfo(); 4206 if (li.mOnAttachStateChangeListeners == null) { 4207 li.mOnAttachStateChangeListeners 4208 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4209 } 4210 li.mOnAttachStateChangeListeners.add(listener); 4211 } 4212 4213 /** 4214 * Remove a listener for attach state changes. The listener will receive no further 4215 * notification of window attach/detach events. 4216 * 4217 * @param listener Listener to remove 4218 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4219 */ 4220 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4221 ListenerInfo li = mListenerInfo; 4222 if (li == null || li.mOnAttachStateChangeListeners == null) { 4223 return; 4224 } 4225 li.mOnAttachStateChangeListeners.remove(listener); 4226 } 4227 4228 /** 4229 * Returns the focus-change callback registered for this view. 4230 * 4231 * @return The callback, or null if one is not registered. 4232 */ 4233 public OnFocusChangeListener getOnFocusChangeListener() { 4234 ListenerInfo li = mListenerInfo; 4235 return li != null ? li.mOnFocusChangeListener : null; 4236 } 4237 4238 /** 4239 * Register a callback to be invoked when this view is clicked. If this view is not 4240 * clickable, it becomes clickable. 4241 * 4242 * @param l The callback that will run 4243 * 4244 * @see #setClickable(boolean) 4245 */ 4246 public void setOnClickListener(OnClickListener l) { 4247 if (!isClickable()) { 4248 setClickable(true); 4249 } 4250 getListenerInfo().mOnClickListener = l; 4251 } 4252 4253 /** 4254 * Return whether this view has an attached OnClickListener. Returns 4255 * true if there is a listener, false if there is none. 4256 */ 4257 public boolean hasOnClickListeners() { 4258 ListenerInfo li = mListenerInfo; 4259 return (li != null && li.mOnClickListener != null); 4260 } 4261 4262 /** 4263 * Register a callback to be invoked when this view is clicked and held. If this view is not 4264 * long clickable, it becomes long clickable. 4265 * 4266 * @param l The callback that will run 4267 * 4268 * @see #setLongClickable(boolean) 4269 */ 4270 public void setOnLongClickListener(OnLongClickListener l) { 4271 if (!isLongClickable()) { 4272 setLongClickable(true); 4273 } 4274 getListenerInfo().mOnLongClickListener = l; 4275 } 4276 4277 /** 4278 * Register a callback to be invoked when the context menu for this view is 4279 * being built. If this view is not long clickable, it becomes long clickable. 4280 * 4281 * @param l The callback that will run 4282 * 4283 */ 4284 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4285 if (!isLongClickable()) { 4286 setLongClickable(true); 4287 } 4288 getListenerInfo().mOnCreateContextMenuListener = l; 4289 } 4290 4291 /** 4292 * Call this view's OnClickListener, if it is defined. Performs all normal 4293 * actions associated with clicking: reporting accessibility event, playing 4294 * a sound, etc. 4295 * 4296 * @return True there was an assigned OnClickListener that was called, false 4297 * otherwise is returned. 4298 */ 4299 public boolean performClick() { 4300 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4301 4302 ListenerInfo li = mListenerInfo; 4303 if (li != null && li.mOnClickListener != null) { 4304 playSoundEffect(SoundEffectConstants.CLICK); 4305 li.mOnClickListener.onClick(this); 4306 return true; 4307 } 4308 4309 return false; 4310 } 4311 4312 /** 4313 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4314 * this only calls the listener, and does not do any associated clicking 4315 * actions like reporting an accessibility event. 4316 * 4317 * @return True there was an assigned OnClickListener that was called, false 4318 * otherwise is returned. 4319 */ 4320 public boolean callOnClick() { 4321 ListenerInfo li = mListenerInfo; 4322 if (li != null && li.mOnClickListener != null) { 4323 li.mOnClickListener.onClick(this); 4324 return true; 4325 } 4326 return false; 4327 } 4328 4329 /** 4330 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4331 * OnLongClickListener did not consume the event. 4332 * 4333 * @return True if one of the above receivers consumed the event, false otherwise. 4334 */ 4335 public boolean performLongClick() { 4336 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4337 4338 boolean handled = false; 4339 ListenerInfo li = mListenerInfo; 4340 if (li != null && li.mOnLongClickListener != null) { 4341 handled = li.mOnLongClickListener.onLongClick(View.this); 4342 } 4343 if (!handled) { 4344 handled = showContextMenu(); 4345 } 4346 if (handled) { 4347 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4348 } 4349 return handled; 4350 } 4351 4352 /** 4353 * Performs button-related actions during a touch down event. 4354 * 4355 * @param event The event. 4356 * @return True if the down was consumed. 4357 * 4358 * @hide 4359 */ 4360 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4361 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4362 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4363 return true; 4364 } 4365 } 4366 return false; 4367 } 4368 4369 /** 4370 * Bring up the context menu for this view. 4371 * 4372 * @return Whether a context menu was displayed. 4373 */ 4374 public boolean showContextMenu() { 4375 return getParent().showContextMenuForChild(this); 4376 } 4377 4378 /** 4379 * Bring up the context menu for this view, referring to the item under the specified point. 4380 * 4381 * @param x The referenced x coordinate. 4382 * @param y The referenced y coordinate. 4383 * @param metaState The keyboard modifiers that were pressed. 4384 * @return Whether a context menu was displayed. 4385 * 4386 * @hide 4387 */ 4388 public boolean showContextMenu(float x, float y, int metaState) { 4389 return showContextMenu(); 4390 } 4391 4392 /** 4393 * Start an action mode. 4394 * 4395 * @param callback Callback that will control the lifecycle of the action mode 4396 * @return The new action mode if it is started, null otherwise 4397 * 4398 * @see ActionMode 4399 */ 4400 public ActionMode startActionMode(ActionMode.Callback callback) { 4401 ViewParent parent = getParent(); 4402 if (parent == null) return null; 4403 return parent.startActionModeForChild(this, callback); 4404 } 4405 4406 /** 4407 * Register a callback to be invoked when a hardware key is pressed in this view. 4408 * Key presses in software input methods will generally not trigger the methods of 4409 * this listener. 4410 * @param l the key listener to attach to this view 4411 */ 4412 public void setOnKeyListener(OnKeyListener l) { 4413 getListenerInfo().mOnKeyListener = l; 4414 } 4415 4416 /** 4417 * Register a callback to be invoked when a touch event is sent to this view. 4418 * @param l the touch listener to attach to this view 4419 */ 4420 public void setOnTouchListener(OnTouchListener l) { 4421 getListenerInfo().mOnTouchListener = l; 4422 } 4423 4424 /** 4425 * Register a callback to be invoked when a generic motion event is sent to this view. 4426 * @param l the generic motion listener to attach to this view 4427 */ 4428 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4429 getListenerInfo().mOnGenericMotionListener = l; 4430 } 4431 4432 /** 4433 * Register a callback to be invoked when a hover event is sent to this view. 4434 * @param l the hover listener to attach to this view 4435 */ 4436 public void setOnHoverListener(OnHoverListener l) { 4437 getListenerInfo().mOnHoverListener = l; 4438 } 4439 4440 /** 4441 * Register a drag event listener callback object for this View. The parameter is 4442 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4443 * View, the system calls the 4444 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4445 * @param l An implementation of {@link android.view.View.OnDragListener}. 4446 */ 4447 public void setOnDragListener(OnDragListener l) { 4448 getListenerInfo().mOnDragListener = l; 4449 } 4450 4451 /** 4452 * Give this view focus. This will cause 4453 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4454 * 4455 * Note: this does not check whether this {@link View} should get focus, it just 4456 * gives it focus no matter what. It should only be called internally by framework 4457 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4458 * 4459 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4460 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4461 * focus moved when requestFocus() is called. It may not always 4462 * apply, in which case use the default View.FOCUS_DOWN. 4463 * @param previouslyFocusedRect The rectangle of the view that had focus 4464 * prior in this View's coordinate system. 4465 */ 4466 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4467 if (DBG) { 4468 System.out.println(this + " requestFocus()"); 4469 } 4470 4471 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4472 mPrivateFlags |= PFLAG_FOCUSED; 4473 4474 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4475 4476 if (mParent != null) { 4477 mParent.requestChildFocus(this, this); 4478 } 4479 4480 if (mAttachInfo != null) { 4481 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4482 } 4483 4484 onFocusChanged(true, direction, previouslyFocusedRect); 4485 refreshDrawableState(); 4486 } 4487 } 4488 4489 /** 4490 * Request that a rectangle of this view be visible on the screen, 4491 * scrolling if necessary just enough. 4492 * 4493 * <p>A View should call this if it maintains some notion of which part 4494 * of its content is interesting. For example, a text editing view 4495 * should call this when its cursor moves. 4496 * 4497 * @param rectangle The rectangle. 4498 * @return Whether any parent scrolled. 4499 */ 4500 public boolean requestRectangleOnScreen(Rect rectangle) { 4501 return requestRectangleOnScreen(rectangle, false); 4502 } 4503 4504 /** 4505 * Request that a rectangle of this view be visible on the screen, 4506 * scrolling if necessary just enough. 4507 * 4508 * <p>A View should call this if it maintains some notion of which part 4509 * of its content is interesting. For example, a text editing view 4510 * should call this when its cursor moves. 4511 * 4512 * <p>When <code>immediate</code> is set to true, scrolling will not be 4513 * animated. 4514 * 4515 * @param rectangle The rectangle. 4516 * @param immediate True to forbid animated scrolling, false otherwise 4517 * @return Whether any parent scrolled. 4518 */ 4519 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4520 if (mParent == null) { 4521 return false; 4522 } 4523 4524 View child = this; 4525 4526 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4527 position.set(rectangle); 4528 4529 ViewParent parent = mParent; 4530 boolean scrolled = false; 4531 while (parent != null) { 4532 rectangle.set((int) position.left, (int) position.top, 4533 (int) position.right, (int) position.bottom); 4534 4535 scrolled |= parent.requestChildRectangleOnScreen(child, 4536 rectangle, immediate); 4537 4538 if (!child.hasIdentityMatrix()) { 4539 child.getMatrix().mapRect(position); 4540 } 4541 4542 position.offset(child.mLeft, child.mTop); 4543 4544 if (!(parent instanceof View)) { 4545 break; 4546 } 4547 4548 View parentView = (View) parent; 4549 4550 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4551 4552 child = parentView; 4553 parent = child.getParent(); 4554 } 4555 4556 return scrolled; 4557 } 4558 4559 /** 4560 * Called when this view wants to give up focus. If focus is cleared 4561 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4562 * <p> 4563 * <strong>Note:</strong> When a View clears focus the framework is trying 4564 * to give focus to the first focusable View from the top. Hence, if this 4565 * View is the first from the top that can take focus, then all callbacks 4566 * related to clearing focus will be invoked after wich the framework will 4567 * give focus to this view. 4568 * </p> 4569 */ 4570 public void clearFocus() { 4571 if (DBG) { 4572 System.out.println(this + " clearFocus()"); 4573 } 4574 4575 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4576 mPrivateFlags &= ~PFLAG_FOCUSED; 4577 4578 if (mParent != null) { 4579 mParent.clearChildFocus(this); 4580 } 4581 4582 onFocusChanged(false, 0, null); 4583 4584 refreshDrawableState(); 4585 4586 if (!rootViewRequestFocus()) { 4587 notifyGlobalFocusCleared(this); 4588 } 4589 } 4590 } 4591 4592 void notifyGlobalFocusCleared(View oldFocus) { 4593 if (oldFocus != null && mAttachInfo != null) { 4594 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 4595 } 4596 } 4597 4598 boolean rootViewRequestFocus() { 4599 final View root = getRootView(); 4600 return root != null && root.requestFocus(); 4601 } 4602 4603 /** 4604 * Called internally by the view system when a new view is getting focus. 4605 * This is what clears the old focus. 4606 * <p> 4607 * <b>NOTE:</b> The parent view's focused child must be updated manually 4608 * after calling this method. Otherwise, the view hierarchy may be left in 4609 * an inconstent state. 4610 */ 4611 void unFocus() { 4612 if (DBG) { 4613 System.out.println(this + " unFocus()"); 4614 } 4615 4616 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4617 mPrivateFlags &= ~PFLAG_FOCUSED; 4618 4619 onFocusChanged(false, 0, null); 4620 refreshDrawableState(); 4621 } 4622 } 4623 4624 /** 4625 * Returns true if this view has focus iteself, or is the ancestor of the 4626 * view that has focus. 4627 * 4628 * @return True if this view has or contains focus, false otherwise. 4629 */ 4630 @ViewDebug.ExportedProperty(category = "focus") 4631 public boolean hasFocus() { 4632 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4633 } 4634 4635 /** 4636 * Returns true if this view is focusable or if it contains a reachable View 4637 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4638 * is a View whose parents do not block descendants focus. 4639 * 4640 * Only {@link #VISIBLE} views are considered focusable. 4641 * 4642 * @return True if the view is focusable or if the view contains a focusable 4643 * View, false otherwise. 4644 * 4645 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4646 */ 4647 public boolean hasFocusable() { 4648 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4649 } 4650 4651 /** 4652 * Called by the view system when the focus state of this view changes. 4653 * When the focus change event is caused by directional navigation, direction 4654 * and previouslyFocusedRect provide insight into where the focus is coming from. 4655 * When overriding, be sure to call up through to the super class so that 4656 * the standard focus handling will occur. 4657 * 4658 * @param gainFocus True if the View has focus; false otherwise. 4659 * @param direction The direction focus has moved when requestFocus() 4660 * is called to give this view focus. Values are 4661 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4662 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4663 * It may not always apply, in which case use the default. 4664 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4665 * system, of the previously focused view. If applicable, this will be 4666 * passed in as finer grained information about where the focus is coming 4667 * from (in addition to direction). Will be <code>null</code> otherwise. 4668 */ 4669 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4670 if (gainFocus) { 4671 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4672 } else { 4673 notifyViewAccessibilityStateChangedIfNeeded(); 4674 } 4675 4676 InputMethodManager imm = InputMethodManager.peekInstance(); 4677 if (!gainFocus) { 4678 if (isPressed()) { 4679 setPressed(false); 4680 } 4681 if (imm != null && mAttachInfo != null 4682 && mAttachInfo.mHasWindowFocus) { 4683 imm.focusOut(this); 4684 } 4685 onFocusLost(); 4686 } else if (imm != null && mAttachInfo != null 4687 && mAttachInfo.mHasWindowFocus) { 4688 imm.focusIn(this); 4689 } 4690 4691 invalidate(true); 4692 ListenerInfo li = mListenerInfo; 4693 if (li != null && li.mOnFocusChangeListener != null) { 4694 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4695 } 4696 4697 if (mAttachInfo != null) { 4698 mAttachInfo.mKeyDispatchState.reset(this); 4699 } 4700 } 4701 4702 /** 4703 * Sends an accessibility event of the given type. If accessibility is 4704 * not enabled this method has no effect. The default implementation calls 4705 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4706 * to populate information about the event source (this View), then calls 4707 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4708 * populate the text content of the event source including its descendants, 4709 * and last calls 4710 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4711 * on its parent to resuest sending of the event to interested parties. 4712 * <p> 4713 * If an {@link AccessibilityDelegate} has been specified via calling 4714 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4715 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4716 * responsible for handling this call. 4717 * </p> 4718 * 4719 * @param eventType The type of the event to send, as defined by several types from 4720 * {@link android.view.accessibility.AccessibilityEvent}, such as 4721 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4722 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4723 * 4724 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4725 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4726 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4727 * @see AccessibilityDelegate 4728 */ 4729 public void sendAccessibilityEvent(int eventType) { 4730 // Excluded views do not send accessibility events. 4731 if (!includeForAccessibility()) { 4732 return; 4733 } 4734 if (mAccessibilityDelegate != null) { 4735 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4736 } else { 4737 sendAccessibilityEventInternal(eventType); 4738 } 4739 } 4740 4741 /** 4742 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4743 * {@link AccessibilityEvent} to make an announcement which is related to some 4744 * sort of a context change for which none of the events representing UI transitions 4745 * is a good fit. For example, announcing a new page in a book. If accessibility 4746 * is not enabled this method does nothing. 4747 * 4748 * @param text The announcement text. 4749 */ 4750 public void announceForAccessibility(CharSequence text) { 4751 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4752 AccessibilityEvent event = AccessibilityEvent.obtain( 4753 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4754 onInitializeAccessibilityEvent(event); 4755 event.getText().add(text); 4756 event.setContentDescription(null); 4757 mParent.requestSendAccessibilityEvent(this, event); 4758 } 4759 } 4760 4761 /** 4762 * @see #sendAccessibilityEvent(int) 4763 * 4764 * Note: Called from the default {@link AccessibilityDelegate}. 4765 */ 4766 void sendAccessibilityEventInternal(int eventType) { 4767 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4768 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4769 } 4770 } 4771 4772 /** 4773 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4774 * takes as an argument an empty {@link AccessibilityEvent} and does not 4775 * perform a check whether accessibility is enabled. 4776 * <p> 4777 * If an {@link AccessibilityDelegate} has been specified via calling 4778 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4779 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4780 * is responsible for handling this call. 4781 * </p> 4782 * 4783 * @param event The event to send. 4784 * 4785 * @see #sendAccessibilityEvent(int) 4786 */ 4787 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4788 if (mAccessibilityDelegate != null) { 4789 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4790 } else { 4791 sendAccessibilityEventUncheckedInternal(event); 4792 } 4793 } 4794 4795 /** 4796 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4797 * 4798 * Note: Called from the default {@link AccessibilityDelegate}. 4799 */ 4800 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4801 if (!isShown()) { 4802 return; 4803 } 4804 onInitializeAccessibilityEvent(event); 4805 // Only a subset of accessibility events populates text content. 4806 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4807 dispatchPopulateAccessibilityEvent(event); 4808 } 4809 // In the beginning we called #isShown(), so we know that getParent() is not null. 4810 getParent().requestSendAccessibilityEvent(this, event); 4811 } 4812 4813 /** 4814 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4815 * to its children for adding their text content to the event. Note that the 4816 * event text is populated in a separate dispatch path since we add to the 4817 * event not only the text of the source but also the text of all its descendants. 4818 * A typical implementation will call 4819 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4820 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4821 * on each child. Override this method if custom population of the event text 4822 * content is required. 4823 * <p> 4824 * If an {@link AccessibilityDelegate} has been specified via calling 4825 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4826 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4827 * is responsible for handling this call. 4828 * </p> 4829 * <p> 4830 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4831 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4832 * </p> 4833 * 4834 * @param event The event. 4835 * 4836 * @return True if the event population was completed. 4837 */ 4838 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4839 if (mAccessibilityDelegate != null) { 4840 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4841 } else { 4842 return dispatchPopulateAccessibilityEventInternal(event); 4843 } 4844 } 4845 4846 /** 4847 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4848 * 4849 * Note: Called from the default {@link AccessibilityDelegate}. 4850 */ 4851 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4852 onPopulateAccessibilityEvent(event); 4853 return false; 4854 } 4855 4856 /** 4857 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4858 * giving a chance to this View to populate the accessibility event with its 4859 * text content. While this method is free to modify event 4860 * attributes other than text content, doing so should normally be performed in 4861 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4862 * <p> 4863 * Example: Adding formatted date string to an accessibility event in addition 4864 * to the text added by the super implementation: 4865 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4866 * super.onPopulateAccessibilityEvent(event); 4867 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4868 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4869 * mCurrentDate.getTimeInMillis(), flags); 4870 * event.getText().add(selectedDateUtterance); 4871 * }</pre> 4872 * <p> 4873 * If an {@link AccessibilityDelegate} has been specified via calling 4874 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4875 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4876 * is responsible for handling this call. 4877 * </p> 4878 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4879 * information to the event, in case the default implementation has basic information to add. 4880 * </p> 4881 * 4882 * @param event The accessibility event which to populate. 4883 * 4884 * @see #sendAccessibilityEvent(int) 4885 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4886 */ 4887 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4888 if (mAccessibilityDelegate != null) { 4889 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4890 } else { 4891 onPopulateAccessibilityEventInternal(event); 4892 } 4893 } 4894 4895 /** 4896 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4897 * 4898 * Note: Called from the default {@link AccessibilityDelegate}. 4899 */ 4900 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4901 } 4902 4903 /** 4904 * Initializes an {@link AccessibilityEvent} with information about 4905 * this View which is the event source. In other words, the source of 4906 * an accessibility event is the view whose state change triggered firing 4907 * the event. 4908 * <p> 4909 * Example: Setting the password property of an event in addition 4910 * to properties set by the super implementation: 4911 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4912 * super.onInitializeAccessibilityEvent(event); 4913 * event.setPassword(true); 4914 * }</pre> 4915 * <p> 4916 * If an {@link AccessibilityDelegate} has been specified via calling 4917 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4918 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4919 * is responsible for handling this call. 4920 * </p> 4921 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4922 * information to the event, in case the default implementation has basic information to add. 4923 * </p> 4924 * @param event The event to initialize. 4925 * 4926 * @see #sendAccessibilityEvent(int) 4927 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4928 */ 4929 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4930 if (mAccessibilityDelegate != null) { 4931 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4932 } else { 4933 onInitializeAccessibilityEventInternal(event); 4934 } 4935 } 4936 4937 /** 4938 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4939 * 4940 * Note: Called from the default {@link AccessibilityDelegate}. 4941 */ 4942 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4943 event.setSource(this); 4944 event.setClassName(View.class.getName()); 4945 event.setPackageName(getContext().getPackageName()); 4946 event.setEnabled(isEnabled()); 4947 event.setContentDescription(mContentDescription); 4948 4949 switch (event.getEventType()) { 4950 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 4951 ArrayList<View> focusablesTempList = (mAttachInfo != null) 4952 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 4953 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 4954 event.setItemCount(focusablesTempList.size()); 4955 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4956 if (mAttachInfo != null) { 4957 focusablesTempList.clear(); 4958 } 4959 } break; 4960 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 4961 CharSequence text = getIterableTextForAccessibility(); 4962 if (text != null && text.length() > 0) { 4963 event.setFromIndex(getAccessibilitySelectionStart()); 4964 event.setToIndex(getAccessibilitySelectionEnd()); 4965 event.setItemCount(text.length()); 4966 } 4967 } break; 4968 } 4969 } 4970 4971 /** 4972 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4973 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4974 * This method is responsible for obtaining an accessibility node info from a 4975 * pool of reusable instances and calling 4976 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4977 * initialize the former. 4978 * <p> 4979 * Note: The client is responsible for recycling the obtained instance by calling 4980 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4981 * </p> 4982 * 4983 * @return A populated {@link AccessibilityNodeInfo}. 4984 * 4985 * @see AccessibilityNodeInfo 4986 */ 4987 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4988 if (mAccessibilityDelegate != null) { 4989 return mAccessibilityDelegate.createAccessibilityNodeInfo(this); 4990 } else { 4991 return createAccessibilityNodeInfoInternal(); 4992 } 4993 } 4994 4995 /** 4996 * @see #createAccessibilityNodeInfo() 4997 */ 4998 AccessibilityNodeInfo createAccessibilityNodeInfoInternal() { 4999 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 5000 if (provider != null) { 5001 return provider.createAccessibilityNodeInfo(View.NO_ID); 5002 } else { 5003 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 5004 onInitializeAccessibilityNodeInfo(info); 5005 return info; 5006 } 5007 } 5008 5009 /** 5010 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 5011 * The base implementation sets: 5012 * <ul> 5013 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 5014 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 5015 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 5016 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 5017 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 5018 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 5019 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 5020 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 5021 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 5022 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 5023 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 5024 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 5025 * </ul> 5026 * <p> 5027 * Subclasses should override this method, call the super implementation, 5028 * and set additional attributes. 5029 * </p> 5030 * <p> 5031 * If an {@link AccessibilityDelegate} has been specified via calling 5032 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5033 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 5034 * is responsible for handling this call. 5035 * </p> 5036 * 5037 * @param info The instance to initialize. 5038 */ 5039 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 5040 if (mAccessibilityDelegate != null) { 5041 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 5042 } else { 5043 onInitializeAccessibilityNodeInfoInternal(info); 5044 } 5045 } 5046 5047 /** 5048 * Gets the location of this view in screen coordintates. 5049 * 5050 * @param outRect The output location 5051 */ 5052 void getBoundsOnScreen(Rect outRect) { 5053 if (mAttachInfo == null) { 5054 return; 5055 } 5056 5057 RectF position = mAttachInfo.mTmpTransformRect; 5058 position.set(0, 0, mRight - mLeft, mBottom - mTop); 5059 5060 if (!hasIdentityMatrix()) { 5061 getMatrix().mapRect(position); 5062 } 5063 5064 position.offset(mLeft, mTop); 5065 5066 ViewParent parent = mParent; 5067 while (parent instanceof View) { 5068 View parentView = (View) parent; 5069 5070 position.offset(-parentView.mScrollX, -parentView.mScrollY); 5071 5072 if (!parentView.hasIdentityMatrix()) { 5073 parentView.getMatrix().mapRect(position); 5074 } 5075 5076 position.offset(parentView.mLeft, parentView.mTop); 5077 5078 parent = parentView.mParent; 5079 } 5080 5081 if (parent instanceof ViewRootImpl) { 5082 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5083 position.offset(0, -viewRootImpl.mCurScrollY); 5084 } 5085 5086 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5087 5088 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5089 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5090 } 5091 5092 /** 5093 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5094 * 5095 * Note: Called from the default {@link AccessibilityDelegate}. 5096 */ 5097 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5098 Rect bounds = mAttachInfo.mTmpInvalRect; 5099 5100 getDrawingRect(bounds); 5101 info.setBoundsInParent(bounds); 5102 5103 getBoundsOnScreen(bounds); 5104 info.setBoundsInScreen(bounds); 5105 5106 ViewParent parent = getParentForAccessibility(); 5107 if (parent instanceof View) { 5108 info.setParent((View) parent); 5109 } 5110 5111 if (mID != View.NO_ID) { 5112 View rootView = getRootView(); 5113 if (rootView == null) { 5114 rootView = this; 5115 } 5116 View label = rootView.findLabelForView(this, mID); 5117 if (label != null) { 5118 info.setLabeledBy(label); 5119 } 5120 5121 if ((mAttachInfo.mAccessibilityFetchFlags 5122 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 5123 && Resources.resourceHasPackage(mID)) { 5124 try { 5125 String viewId = getResources().getResourceName(mID); 5126 info.setViewIdResourceName(viewId); 5127 } catch (Resources.NotFoundException nfe) { 5128 /* ignore */ 5129 } 5130 } 5131 } 5132 5133 if (mLabelForId != View.NO_ID) { 5134 View rootView = getRootView(); 5135 if (rootView == null) { 5136 rootView = this; 5137 } 5138 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5139 if (labeled != null) { 5140 info.setLabelFor(labeled); 5141 } 5142 } 5143 5144 info.setVisibleToUser(isVisibleToUser()); 5145 5146 info.setPackageName(mContext.getPackageName()); 5147 info.setClassName(View.class.getName()); 5148 info.setContentDescription(getContentDescription()); 5149 5150 info.setEnabled(isEnabled()); 5151 info.setClickable(isClickable()); 5152 info.setFocusable(isFocusable()); 5153 info.setFocused(isFocused()); 5154 info.setAccessibilityFocused(isAccessibilityFocused()); 5155 info.setSelected(isSelected()); 5156 info.setLongClickable(isLongClickable()); 5157 5158 // TODO: These make sense only if we are in an AdapterView but all 5159 // views can be selected. Maybe from accessibility perspective 5160 // we should report as selectable view in an AdapterView. 5161 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5162 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5163 5164 if (isFocusable()) { 5165 if (isFocused()) { 5166 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5167 } else { 5168 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5169 } 5170 } 5171 5172 if (!isAccessibilityFocused()) { 5173 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5174 } else { 5175 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5176 } 5177 5178 if (isClickable() && isEnabled()) { 5179 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5180 } 5181 5182 if (isLongClickable() && isEnabled()) { 5183 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5184 } 5185 5186 CharSequence text = getIterableTextForAccessibility(); 5187 if (text != null && text.length() > 0) { 5188 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5189 5190 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5191 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5192 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5193 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5194 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5195 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5196 } 5197 } 5198 5199 private View findLabelForView(View view, int labeledId) { 5200 if (mMatchLabelForPredicate == null) { 5201 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5202 } 5203 mMatchLabelForPredicate.mLabeledId = labeledId; 5204 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5205 } 5206 5207 /** 5208 * Computes whether this view is visible to the user. Such a view is 5209 * attached, visible, all its predecessors are visible, it is not clipped 5210 * entirely by its predecessors, and has an alpha greater than zero. 5211 * 5212 * @return Whether the view is visible on the screen. 5213 * 5214 * @hide 5215 */ 5216 protected boolean isVisibleToUser() { 5217 return isVisibleToUser(null); 5218 } 5219 5220 /** 5221 * Computes whether the given portion of this view is visible to the user. 5222 * Such a view is attached, visible, all its predecessors are visible, 5223 * has an alpha greater than zero, and the specified portion is not 5224 * clipped entirely by its predecessors. 5225 * 5226 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5227 * <code>null</code>, and the entire view will be tested in this case. 5228 * When <code>true</code> is returned by the function, the actual visible 5229 * region will be stored in this parameter; that is, if boundInView is fully 5230 * contained within the view, no modification will be made, otherwise regions 5231 * outside of the visible area of the view will be clipped. 5232 * 5233 * @return Whether the specified portion of the view is visible on the screen. 5234 * 5235 * @hide 5236 */ 5237 protected boolean isVisibleToUser(Rect boundInView) { 5238 if (mAttachInfo != null) { 5239 // Attached to invisible window means this view is not visible. 5240 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5241 return false; 5242 } 5243 // An invisible predecessor or one with alpha zero means 5244 // that this view is not visible to the user. 5245 Object current = this; 5246 while (current instanceof View) { 5247 View view = (View) current; 5248 // We have attach info so this view is attached and there is no 5249 // need to check whether we reach to ViewRootImpl on the way up. 5250 if (view.getAlpha() <= 0 || view.getVisibility() != VISIBLE) { 5251 return false; 5252 } 5253 current = view.mParent; 5254 } 5255 // Check if the view is entirely covered by its predecessors. 5256 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5257 Point offset = mAttachInfo.mPoint; 5258 if (!getGlobalVisibleRect(visibleRect, offset)) { 5259 return false; 5260 } 5261 // Check if the visible portion intersects the rectangle of interest. 5262 if (boundInView != null) { 5263 visibleRect.offset(-offset.x, -offset.y); 5264 return boundInView.intersect(visibleRect); 5265 } 5266 return true; 5267 } 5268 return false; 5269 } 5270 5271 /** 5272 * Returns the delegate for implementing accessibility support via 5273 * composition. For more details see {@link AccessibilityDelegate}. 5274 * 5275 * @return The delegate, or null if none set. 5276 * 5277 * @hide 5278 */ 5279 public AccessibilityDelegate getAccessibilityDelegate() { 5280 return mAccessibilityDelegate; 5281 } 5282 5283 /** 5284 * Sets a delegate for implementing accessibility support via composition as 5285 * opposed to inheritance. The delegate's primary use is for implementing 5286 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5287 * 5288 * @param delegate The delegate instance. 5289 * 5290 * @see AccessibilityDelegate 5291 */ 5292 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5293 mAccessibilityDelegate = delegate; 5294 } 5295 5296 /** 5297 * Gets the provider for managing a virtual view hierarchy rooted at this View 5298 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5299 * that explore the window content. 5300 * <p> 5301 * If this method returns an instance, this instance is responsible for managing 5302 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5303 * View including the one representing the View itself. Similarly the returned 5304 * instance is responsible for performing accessibility actions on any virtual 5305 * view or the root view itself. 5306 * </p> 5307 * <p> 5308 * If an {@link AccessibilityDelegate} has been specified via calling 5309 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5310 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5311 * is responsible for handling this call. 5312 * </p> 5313 * 5314 * @return The provider. 5315 * 5316 * @see AccessibilityNodeProvider 5317 */ 5318 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5319 if (mAccessibilityDelegate != null) { 5320 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5321 } else { 5322 return null; 5323 } 5324 } 5325 5326 /** 5327 * Gets the unique identifier of this view on the screen for accessibility purposes. 5328 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5329 * 5330 * @return The view accessibility id. 5331 * 5332 * @hide 5333 */ 5334 public int getAccessibilityViewId() { 5335 if (mAccessibilityViewId == NO_ID) { 5336 mAccessibilityViewId = sNextAccessibilityViewId++; 5337 } 5338 return mAccessibilityViewId; 5339 } 5340 5341 /** 5342 * Gets the unique identifier of the window in which this View reseides. 5343 * 5344 * @return The window accessibility id. 5345 * 5346 * @hide 5347 */ 5348 public int getAccessibilityWindowId() { 5349 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5350 } 5351 5352 /** 5353 * Gets the {@link View} description. It briefly describes the view and is 5354 * primarily used for accessibility support. Set this property to enable 5355 * better accessibility support for your application. This is especially 5356 * true for views that do not have textual representation (For example, 5357 * ImageButton). 5358 * 5359 * @return The content description. 5360 * 5361 * @attr ref android.R.styleable#View_contentDescription 5362 */ 5363 @ViewDebug.ExportedProperty(category = "accessibility") 5364 public CharSequence getContentDescription() { 5365 return mContentDescription; 5366 } 5367 5368 /** 5369 * Sets the {@link View} description. It briefly describes the view and is 5370 * primarily used for accessibility support. Set this property to enable 5371 * better accessibility support for your application. This is especially 5372 * true for views that do not have textual representation (For example, 5373 * ImageButton). 5374 * 5375 * @param contentDescription The content description. 5376 * 5377 * @attr ref android.R.styleable#View_contentDescription 5378 */ 5379 @RemotableViewMethod 5380 public void setContentDescription(CharSequence contentDescription) { 5381 if (mContentDescription == null) { 5382 if (contentDescription == null) { 5383 return; 5384 } 5385 } else if (mContentDescription.equals(contentDescription)) { 5386 return; 5387 } 5388 mContentDescription = contentDescription; 5389 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5390 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5391 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5392 notifySubtreeAccessibilityStateChangedIfNeeded(); 5393 } else { 5394 notifyViewAccessibilityStateChangedIfNeeded(); 5395 } 5396 } 5397 5398 /** 5399 * Gets the id of a view for which this view serves as a label for 5400 * accessibility purposes. 5401 * 5402 * @return The labeled view id. 5403 */ 5404 @ViewDebug.ExportedProperty(category = "accessibility") 5405 public int getLabelFor() { 5406 return mLabelForId; 5407 } 5408 5409 /** 5410 * Sets the id of a view for which this view serves as a label for 5411 * accessibility purposes. 5412 * 5413 * @param id The labeled view id. 5414 */ 5415 @RemotableViewMethod 5416 public void setLabelFor(int id) { 5417 mLabelForId = id; 5418 if (mLabelForId != View.NO_ID 5419 && mID == View.NO_ID) { 5420 mID = generateViewId(); 5421 } 5422 } 5423 5424 /** 5425 * Invoked whenever this view loses focus, either by losing window focus or by losing 5426 * focus within its window. This method can be used to clear any state tied to the 5427 * focus. For instance, if a button is held pressed with the trackball and the window 5428 * loses focus, this method can be used to cancel the press. 5429 * 5430 * Subclasses of View overriding this method should always call super.onFocusLost(). 5431 * 5432 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5433 * @see #onWindowFocusChanged(boolean) 5434 * 5435 * @hide pending API council approval 5436 */ 5437 protected void onFocusLost() { 5438 resetPressedState(); 5439 } 5440 5441 private void resetPressedState() { 5442 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5443 return; 5444 } 5445 5446 if (isPressed()) { 5447 setPressed(false); 5448 5449 if (!mHasPerformedLongPress) { 5450 removeLongPressCallback(); 5451 } 5452 } 5453 } 5454 5455 /** 5456 * Returns true if this view has focus 5457 * 5458 * @return True if this view has focus, false otherwise. 5459 */ 5460 @ViewDebug.ExportedProperty(category = "focus") 5461 public boolean isFocused() { 5462 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5463 } 5464 5465 /** 5466 * Find the view in the hierarchy rooted at this view that currently has 5467 * focus. 5468 * 5469 * @return The view that currently has focus, or null if no focused view can 5470 * be found. 5471 */ 5472 public View findFocus() { 5473 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5474 } 5475 5476 /** 5477 * Indicates whether this view is one of the set of scrollable containers in 5478 * its window. 5479 * 5480 * @return whether this view is one of the set of scrollable containers in 5481 * its window 5482 * 5483 * @attr ref android.R.styleable#View_isScrollContainer 5484 */ 5485 public boolean isScrollContainer() { 5486 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5487 } 5488 5489 /** 5490 * Change whether this view is one of the set of scrollable containers in 5491 * its window. This will be used to determine whether the window can 5492 * resize or must pan when a soft input area is open -- scrollable 5493 * containers allow the window to use resize mode since the container 5494 * will appropriately shrink. 5495 * 5496 * @attr ref android.R.styleable#View_isScrollContainer 5497 */ 5498 public void setScrollContainer(boolean isScrollContainer) { 5499 if (isScrollContainer) { 5500 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5501 mAttachInfo.mScrollContainers.add(this); 5502 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5503 } 5504 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5505 } else { 5506 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5507 mAttachInfo.mScrollContainers.remove(this); 5508 } 5509 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5510 } 5511 } 5512 5513 /** 5514 * Returns the quality of the drawing cache. 5515 * 5516 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5517 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5518 * 5519 * @see #setDrawingCacheQuality(int) 5520 * @see #setDrawingCacheEnabled(boolean) 5521 * @see #isDrawingCacheEnabled() 5522 * 5523 * @attr ref android.R.styleable#View_drawingCacheQuality 5524 */ 5525 public int getDrawingCacheQuality() { 5526 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5527 } 5528 5529 /** 5530 * Set the drawing cache quality of this view. This value is used only when the 5531 * drawing cache is enabled 5532 * 5533 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5534 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5535 * 5536 * @see #getDrawingCacheQuality() 5537 * @see #setDrawingCacheEnabled(boolean) 5538 * @see #isDrawingCacheEnabled() 5539 * 5540 * @attr ref android.R.styleable#View_drawingCacheQuality 5541 */ 5542 public void setDrawingCacheQuality(int quality) { 5543 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5544 } 5545 5546 /** 5547 * Returns whether the screen should remain on, corresponding to the current 5548 * value of {@link #KEEP_SCREEN_ON}. 5549 * 5550 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5551 * 5552 * @see #setKeepScreenOn(boolean) 5553 * 5554 * @attr ref android.R.styleable#View_keepScreenOn 5555 */ 5556 public boolean getKeepScreenOn() { 5557 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5558 } 5559 5560 /** 5561 * Controls whether the screen should remain on, modifying the 5562 * value of {@link #KEEP_SCREEN_ON}. 5563 * 5564 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5565 * 5566 * @see #getKeepScreenOn() 5567 * 5568 * @attr ref android.R.styleable#View_keepScreenOn 5569 */ 5570 public void setKeepScreenOn(boolean keepScreenOn) { 5571 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5572 } 5573 5574 /** 5575 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5576 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5577 * 5578 * @attr ref android.R.styleable#View_nextFocusLeft 5579 */ 5580 public int getNextFocusLeftId() { 5581 return mNextFocusLeftId; 5582 } 5583 5584 /** 5585 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5586 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5587 * decide automatically. 5588 * 5589 * @attr ref android.R.styleable#View_nextFocusLeft 5590 */ 5591 public void setNextFocusLeftId(int nextFocusLeftId) { 5592 mNextFocusLeftId = nextFocusLeftId; 5593 } 5594 5595 /** 5596 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5597 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5598 * 5599 * @attr ref android.R.styleable#View_nextFocusRight 5600 */ 5601 public int getNextFocusRightId() { 5602 return mNextFocusRightId; 5603 } 5604 5605 /** 5606 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5607 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5608 * decide automatically. 5609 * 5610 * @attr ref android.R.styleable#View_nextFocusRight 5611 */ 5612 public void setNextFocusRightId(int nextFocusRightId) { 5613 mNextFocusRightId = nextFocusRightId; 5614 } 5615 5616 /** 5617 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5618 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5619 * 5620 * @attr ref android.R.styleable#View_nextFocusUp 5621 */ 5622 public int getNextFocusUpId() { 5623 return mNextFocusUpId; 5624 } 5625 5626 /** 5627 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5628 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5629 * decide automatically. 5630 * 5631 * @attr ref android.R.styleable#View_nextFocusUp 5632 */ 5633 public void setNextFocusUpId(int nextFocusUpId) { 5634 mNextFocusUpId = nextFocusUpId; 5635 } 5636 5637 /** 5638 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5639 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5640 * 5641 * @attr ref android.R.styleable#View_nextFocusDown 5642 */ 5643 public int getNextFocusDownId() { 5644 return mNextFocusDownId; 5645 } 5646 5647 /** 5648 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5649 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5650 * decide automatically. 5651 * 5652 * @attr ref android.R.styleable#View_nextFocusDown 5653 */ 5654 public void setNextFocusDownId(int nextFocusDownId) { 5655 mNextFocusDownId = nextFocusDownId; 5656 } 5657 5658 /** 5659 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5660 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5661 * 5662 * @attr ref android.R.styleable#View_nextFocusForward 5663 */ 5664 public int getNextFocusForwardId() { 5665 return mNextFocusForwardId; 5666 } 5667 5668 /** 5669 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5670 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5671 * decide automatically. 5672 * 5673 * @attr ref android.R.styleable#View_nextFocusForward 5674 */ 5675 public void setNextFocusForwardId(int nextFocusForwardId) { 5676 mNextFocusForwardId = nextFocusForwardId; 5677 } 5678 5679 /** 5680 * Returns the visibility of this view and all of its ancestors 5681 * 5682 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5683 */ 5684 public boolean isShown() { 5685 View current = this; 5686 //noinspection ConstantConditions 5687 do { 5688 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5689 return false; 5690 } 5691 ViewParent parent = current.mParent; 5692 if (parent == null) { 5693 return false; // We are not attached to the view root 5694 } 5695 if (!(parent instanceof View)) { 5696 return true; 5697 } 5698 current = (View) parent; 5699 } while (current != null); 5700 5701 return false; 5702 } 5703 5704 /** 5705 * Called by the view hierarchy when the content insets for a window have 5706 * changed, to allow it to adjust its content to fit within those windows. 5707 * The content insets tell you the space that the status bar, input method, 5708 * and other system windows infringe on the application's window. 5709 * 5710 * <p>You do not normally need to deal with this function, since the default 5711 * window decoration given to applications takes care of applying it to the 5712 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5713 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5714 * and your content can be placed under those system elements. You can then 5715 * use this method within your view hierarchy if you have parts of your UI 5716 * which you would like to ensure are not being covered. 5717 * 5718 * <p>The default implementation of this method simply applies the content 5719 * insets to the view's padding, consuming that content (modifying the 5720 * insets to be 0), and returning true. This behavior is off by default, but can 5721 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5722 * 5723 * <p>This function's traversal down the hierarchy is depth-first. The same content 5724 * insets object is propagated down the hierarchy, so any changes made to it will 5725 * be seen by all following views (including potentially ones above in 5726 * the hierarchy since this is a depth-first traversal). The first view 5727 * that returns true will abort the entire traversal. 5728 * 5729 * <p>The default implementation works well for a situation where it is 5730 * used with a container that covers the entire window, allowing it to 5731 * apply the appropriate insets to its content on all edges. If you need 5732 * a more complicated layout (such as two different views fitting system 5733 * windows, one on the top of the window, and one on the bottom), 5734 * you can override the method and handle the insets however you would like. 5735 * Note that the insets provided by the framework are always relative to the 5736 * far edges of the window, not accounting for the location of the called view 5737 * within that window. (In fact when this method is called you do not yet know 5738 * where the layout will place the view, as it is done before layout happens.) 5739 * 5740 * <p>Note: unlike many View methods, there is no dispatch phase to this 5741 * call. If you are overriding it in a ViewGroup and want to allow the 5742 * call to continue to your children, you must be sure to call the super 5743 * implementation. 5744 * 5745 * <p>Here is a sample layout that makes use of fitting system windows 5746 * to have controls for a video view placed inside of the window decorations 5747 * that it hides and shows. This can be used with code like the second 5748 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5749 * 5750 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5751 * 5752 * @param insets Current content insets of the window. Prior to 5753 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5754 * the insets or else you and Android will be unhappy. 5755 * 5756 * @return {@code true} if this view applied the insets and it should not 5757 * continue propagating further down the hierarchy, {@code false} otherwise. 5758 * @see #getFitsSystemWindows() 5759 * @see #setFitsSystemWindows(boolean) 5760 * @see #setSystemUiVisibility(int) 5761 */ 5762 protected boolean fitSystemWindows(Rect insets) { 5763 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5764 mUserPaddingStart = UNDEFINED_PADDING; 5765 mUserPaddingEnd = UNDEFINED_PADDING; 5766 Rect localInsets = sThreadLocal.get(); 5767 if (localInsets == null) { 5768 localInsets = new Rect(); 5769 sThreadLocal.set(localInsets); 5770 } 5771 boolean res = computeFitSystemWindows(insets, localInsets); 5772 internalSetPadding(localInsets.left, localInsets.top, 5773 localInsets.right, localInsets.bottom); 5774 return res; 5775 } 5776 return false; 5777 } 5778 5779 /** 5780 * @hide Compute the insets that should be consumed by this view and the ones 5781 * that should propagate to those under it. 5782 */ 5783 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 5784 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5785 || mAttachInfo == null 5786 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 5787 && !mAttachInfo.mOverscanRequested)) { 5788 outLocalInsets.set(inoutInsets); 5789 inoutInsets.set(0, 0, 0, 0); 5790 return true; 5791 } else { 5792 // The application wants to take care of fitting system window for 5793 // the content... however we still need to take care of any overscan here. 5794 final Rect overscan = mAttachInfo.mOverscanInsets; 5795 outLocalInsets.set(overscan); 5796 inoutInsets.left -= overscan.left; 5797 inoutInsets.top -= overscan.top; 5798 inoutInsets.right -= overscan.right; 5799 inoutInsets.bottom -= overscan.bottom; 5800 return false; 5801 } 5802 } 5803 5804 /** 5805 * Sets whether or not this view should account for system screen decorations 5806 * such as the status bar and inset its content; that is, controlling whether 5807 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5808 * executed. See that method for more details. 5809 * 5810 * <p>Note that if you are providing your own implementation of 5811 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5812 * flag to true -- your implementation will be overriding the default 5813 * implementation that checks this flag. 5814 * 5815 * @param fitSystemWindows If true, then the default implementation of 5816 * {@link #fitSystemWindows(Rect)} will be executed. 5817 * 5818 * @attr ref android.R.styleable#View_fitsSystemWindows 5819 * @see #getFitsSystemWindows() 5820 * @see #fitSystemWindows(Rect) 5821 * @see #setSystemUiVisibility(int) 5822 */ 5823 public void setFitsSystemWindows(boolean fitSystemWindows) { 5824 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5825 } 5826 5827 /** 5828 * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method 5829 * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)} 5830 * will be executed. 5831 * 5832 * @return {@code true} if the default implementation of 5833 * {@link #fitSystemWindows(Rect)} will be executed. 5834 * 5835 * @attr ref android.R.styleable#View_fitsSystemWindows 5836 * @see #setFitsSystemWindows(boolean) 5837 * @see #fitSystemWindows(Rect) 5838 * @see #setSystemUiVisibility(int) 5839 */ 5840 public boolean getFitsSystemWindows() { 5841 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5842 } 5843 5844 /** @hide */ 5845 public boolean fitsSystemWindows() { 5846 return getFitsSystemWindows(); 5847 } 5848 5849 /** 5850 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5851 */ 5852 public void requestFitSystemWindows() { 5853 if (mParent != null) { 5854 mParent.requestFitSystemWindows(); 5855 } 5856 } 5857 5858 /** 5859 * For use by PhoneWindow to make its own system window fitting optional. 5860 * @hide 5861 */ 5862 public void makeOptionalFitsSystemWindows() { 5863 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5864 } 5865 5866 /** 5867 * Returns the visibility status for this view. 5868 * 5869 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5870 * @attr ref android.R.styleable#View_visibility 5871 */ 5872 @ViewDebug.ExportedProperty(mapping = { 5873 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5874 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5875 @ViewDebug.IntToString(from = GONE, to = "GONE") 5876 }) 5877 public int getVisibility() { 5878 return mViewFlags & VISIBILITY_MASK; 5879 } 5880 5881 /** 5882 * Set the enabled state of this view. 5883 * 5884 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5885 * @attr ref android.R.styleable#View_visibility 5886 */ 5887 @RemotableViewMethod 5888 public void setVisibility(int visibility) { 5889 setFlags(visibility, VISIBILITY_MASK); 5890 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5891 } 5892 5893 /** 5894 * Returns the enabled status for this view. The interpretation of the 5895 * enabled state varies by subclass. 5896 * 5897 * @return True if this view is enabled, false otherwise. 5898 */ 5899 @ViewDebug.ExportedProperty 5900 public boolean isEnabled() { 5901 return (mViewFlags & ENABLED_MASK) == ENABLED; 5902 } 5903 5904 /** 5905 * Set the enabled state of this view. The interpretation of the enabled 5906 * state varies by subclass. 5907 * 5908 * @param enabled True if this view is enabled, false otherwise. 5909 */ 5910 @RemotableViewMethod 5911 public void setEnabled(boolean enabled) { 5912 if (enabled == isEnabled()) return; 5913 5914 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5915 5916 /* 5917 * The View most likely has to change its appearance, so refresh 5918 * the drawable state. 5919 */ 5920 refreshDrawableState(); 5921 5922 // Invalidate too, since the default behavior for views is to be 5923 // be drawn at 50% alpha rather than to change the drawable. 5924 invalidate(true); 5925 } 5926 5927 /** 5928 * Set whether this view can receive the focus. 5929 * 5930 * Setting this to false will also ensure that this view is not focusable 5931 * in touch mode. 5932 * 5933 * @param focusable If true, this view can receive the focus. 5934 * 5935 * @see #setFocusableInTouchMode(boolean) 5936 * @attr ref android.R.styleable#View_focusable 5937 */ 5938 public void setFocusable(boolean focusable) { 5939 if (!focusable) { 5940 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5941 } 5942 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5943 } 5944 5945 /** 5946 * Set whether this view can receive focus while in touch mode. 5947 * 5948 * Setting this to true will also ensure that this view is focusable. 5949 * 5950 * @param focusableInTouchMode If true, this view can receive the focus while 5951 * in touch mode. 5952 * 5953 * @see #setFocusable(boolean) 5954 * @attr ref android.R.styleable#View_focusableInTouchMode 5955 */ 5956 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5957 // Focusable in touch mode should always be set before the focusable flag 5958 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5959 // which, in touch mode, will not successfully request focus on this view 5960 // because the focusable in touch mode flag is not set 5961 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5962 if (focusableInTouchMode) { 5963 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5964 } 5965 } 5966 5967 /** 5968 * Set whether this view should have sound effects enabled for events such as 5969 * clicking and touching. 5970 * 5971 * <p>You may wish to disable sound effects for a view if you already play sounds, 5972 * for instance, a dial key that plays dtmf tones. 5973 * 5974 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5975 * @see #isSoundEffectsEnabled() 5976 * @see #playSoundEffect(int) 5977 * @attr ref android.R.styleable#View_soundEffectsEnabled 5978 */ 5979 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5980 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5981 } 5982 5983 /** 5984 * @return whether this view should have sound effects enabled for events such as 5985 * clicking and touching. 5986 * 5987 * @see #setSoundEffectsEnabled(boolean) 5988 * @see #playSoundEffect(int) 5989 * @attr ref android.R.styleable#View_soundEffectsEnabled 5990 */ 5991 @ViewDebug.ExportedProperty 5992 public boolean isSoundEffectsEnabled() { 5993 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5994 } 5995 5996 /** 5997 * Set whether this view should have haptic feedback for events such as 5998 * long presses. 5999 * 6000 * <p>You may wish to disable haptic feedback if your view already controls 6001 * its own haptic feedback. 6002 * 6003 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 6004 * @see #isHapticFeedbackEnabled() 6005 * @see #performHapticFeedback(int) 6006 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6007 */ 6008 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 6009 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 6010 } 6011 6012 /** 6013 * @return whether this view should have haptic feedback enabled for events 6014 * long presses. 6015 * 6016 * @see #setHapticFeedbackEnabled(boolean) 6017 * @see #performHapticFeedback(int) 6018 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6019 */ 6020 @ViewDebug.ExportedProperty 6021 public boolean isHapticFeedbackEnabled() { 6022 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 6023 } 6024 6025 /** 6026 * Returns the layout direction for this view. 6027 * 6028 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 6029 * {@link #LAYOUT_DIRECTION_RTL}, 6030 * {@link #LAYOUT_DIRECTION_INHERIT} or 6031 * {@link #LAYOUT_DIRECTION_LOCALE}. 6032 * 6033 * @attr ref android.R.styleable#View_layoutDirection 6034 * 6035 * @hide 6036 */ 6037 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6038 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 6039 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 6040 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 6041 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 6042 }) 6043 public int getRawLayoutDirection() { 6044 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 6045 } 6046 6047 /** 6048 * Set the layout direction for this view. This will propagate a reset of layout direction 6049 * resolution to the view's children and resolve layout direction for this view. 6050 * 6051 * @param layoutDirection the layout direction to set. Should be one of: 6052 * 6053 * {@link #LAYOUT_DIRECTION_LTR}, 6054 * {@link #LAYOUT_DIRECTION_RTL}, 6055 * {@link #LAYOUT_DIRECTION_INHERIT}, 6056 * {@link #LAYOUT_DIRECTION_LOCALE}. 6057 * 6058 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 6059 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 6060 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 6061 * 6062 * @attr ref android.R.styleable#View_layoutDirection 6063 */ 6064 @RemotableViewMethod 6065 public void setLayoutDirection(int layoutDirection) { 6066 if (getRawLayoutDirection() != layoutDirection) { 6067 // Reset the current layout direction and the resolved one 6068 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 6069 resetRtlProperties(); 6070 // Set the new layout direction (filtered) 6071 mPrivateFlags2 |= 6072 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 6073 // We need to resolve all RTL properties as they all depend on layout direction 6074 resolveRtlPropertiesIfNeeded(); 6075 requestLayout(); 6076 invalidate(true); 6077 } 6078 } 6079 6080 /** 6081 * Returns the resolved layout direction for this view. 6082 * 6083 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6084 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6085 * 6086 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6087 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6088 * 6089 * @attr ref android.R.styleable#View_layoutDirection 6090 */ 6091 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6092 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6093 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6094 }) 6095 public int getLayoutDirection() { 6096 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6097 if (targetSdkVersion < JELLY_BEAN_MR1) { 6098 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6099 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6100 } 6101 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6102 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6103 } 6104 6105 /** 6106 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6107 * layout attribute and/or the inherited value from the parent 6108 * 6109 * @return true if the layout is right-to-left. 6110 * 6111 * @hide 6112 */ 6113 @ViewDebug.ExportedProperty(category = "layout") 6114 public boolean isLayoutRtl() { 6115 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6116 } 6117 6118 /** 6119 * Indicates whether the view is currently tracking transient state that the 6120 * app should not need to concern itself with saving and restoring, but that 6121 * the framework should take special note to preserve when possible. 6122 * 6123 * <p>A view with transient state cannot be trivially rebound from an external 6124 * data source, such as an adapter binding item views in a list. This may be 6125 * because the view is performing an animation, tracking user selection 6126 * of content, or similar.</p> 6127 * 6128 * @return true if the view has transient state 6129 */ 6130 @ViewDebug.ExportedProperty(category = "layout") 6131 public boolean hasTransientState() { 6132 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6133 } 6134 6135 /** 6136 * Set whether this view is currently tracking transient state that the 6137 * framework should attempt to preserve when possible. This flag is reference counted, 6138 * so every call to setHasTransientState(true) should be paired with a later call 6139 * to setHasTransientState(false). 6140 * 6141 * <p>A view with transient state cannot be trivially rebound from an external 6142 * data source, such as an adapter binding item views in a list. This may be 6143 * because the view is performing an animation, tracking user selection 6144 * of content, or similar.</p> 6145 * 6146 * @param hasTransientState true if this view has transient state 6147 */ 6148 public void setHasTransientState(boolean hasTransientState) { 6149 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6150 mTransientStateCount - 1; 6151 if (mTransientStateCount < 0) { 6152 mTransientStateCount = 0; 6153 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6154 "unmatched pair of setHasTransientState calls"); 6155 } else if ((hasTransientState && mTransientStateCount == 1) || 6156 (!hasTransientState && mTransientStateCount == 0)) { 6157 // update flag if we've just incremented up from 0 or decremented down to 0 6158 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6159 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6160 if (mParent != null) { 6161 try { 6162 mParent.childHasTransientStateChanged(this, hasTransientState); 6163 } catch (AbstractMethodError e) { 6164 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6165 " does not fully implement ViewParent", e); 6166 } 6167 } 6168 } 6169 } 6170 6171 /** 6172 * Returns true if this view is currently attached to a window. 6173 */ 6174 public boolean isAttachedToWindow() { 6175 return mAttachInfo != null; 6176 } 6177 6178 /** 6179 * Returns true if this view has been through at least one layout since it 6180 * was last attached to or detached from a window. 6181 */ 6182 public boolean isLaidOut() { 6183 return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT; 6184 } 6185 6186 /** 6187 * If this view doesn't do any drawing on its own, set this flag to 6188 * allow further optimizations. By default, this flag is not set on 6189 * View, but could be set on some View subclasses such as ViewGroup. 6190 * 6191 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6192 * you should clear this flag. 6193 * 6194 * @param willNotDraw whether or not this View draw on its own 6195 */ 6196 public void setWillNotDraw(boolean willNotDraw) { 6197 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6198 } 6199 6200 /** 6201 * Returns whether or not this View draws on its own. 6202 * 6203 * @return true if this view has nothing to draw, false otherwise 6204 */ 6205 @ViewDebug.ExportedProperty(category = "drawing") 6206 public boolean willNotDraw() { 6207 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 6208 } 6209 6210 /** 6211 * When a View's drawing cache is enabled, drawing is redirected to an 6212 * offscreen bitmap. Some views, like an ImageView, must be able to 6213 * bypass this mechanism if they already draw a single bitmap, to avoid 6214 * unnecessary usage of the memory. 6215 * 6216 * @param willNotCacheDrawing true if this view does not cache its 6217 * drawing, false otherwise 6218 */ 6219 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6220 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6221 } 6222 6223 /** 6224 * Returns whether or not this View can cache its drawing or not. 6225 * 6226 * @return true if this view does not cache its drawing, false otherwise 6227 */ 6228 @ViewDebug.ExportedProperty(category = "drawing") 6229 public boolean willNotCacheDrawing() { 6230 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6231 } 6232 6233 /** 6234 * Indicates whether this view reacts to click events or not. 6235 * 6236 * @return true if the view is clickable, false otherwise 6237 * 6238 * @see #setClickable(boolean) 6239 * @attr ref android.R.styleable#View_clickable 6240 */ 6241 @ViewDebug.ExportedProperty 6242 public boolean isClickable() { 6243 return (mViewFlags & CLICKABLE) == CLICKABLE; 6244 } 6245 6246 /** 6247 * Enables or disables click events for this view. When a view 6248 * is clickable it will change its state to "pressed" on every click. 6249 * Subclasses should set the view clickable to visually react to 6250 * user's clicks. 6251 * 6252 * @param clickable true to make the view clickable, false otherwise 6253 * 6254 * @see #isClickable() 6255 * @attr ref android.R.styleable#View_clickable 6256 */ 6257 public void setClickable(boolean clickable) { 6258 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6259 } 6260 6261 /** 6262 * Indicates whether this view reacts to long click events or not. 6263 * 6264 * @return true if the view is long clickable, false otherwise 6265 * 6266 * @see #setLongClickable(boolean) 6267 * @attr ref android.R.styleable#View_longClickable 6268 */ 6269 public boolean isLongClickable() { 6270 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6271 } 6272 6273 /** 6274 * Enables or disables long click events for this view. When a view is long 6275 * clickable it reacts to the user holding down the button for a longer 6276 * duration than a tap. This event can either launch the listener or a 6277 * context menu. 6278 * 6279 * @param longClickable true to make the view long clickable, false otherwise 6280 * @see #isLongClickable() 6281 * @attr ref android.R.styleable#View_longClickable 6282 */ 6283 public void setLongClickable(boolean longClickable) { 6284 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6285 } 6286 6287 /** 6288 * Sets the pressed state for this view. 6289 * 6290 * @see #isClickable() 6291 * @see #setClickable(boolean) 6292 * 6293 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6294 * the View's internal state from a previously set "pressed" state. 6295 */ 6296 public void setPressed(boolean pressed) { 6297 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6298 6299 if (pressed) { 6300 mPrivateFlags |= PFLAG_PRESSED; 6301 } else { 6302 mPrivateFlags &= ~PFLAG_PRESSED; 6303 } 6304 6305 if (needsRefresh) { 6306 refreshDrawableState(); 6307 } 6308 dispatchSetPressed(pressed); 6309 } 6310 6311 /** 6312 * Dispatch setPressed to all of this View's children. 6313 * 6314 * @see #setPressed(boolean) 6315 * 6316 * @param pressed The new pressed state 6317 */ 6318 protected void dispatchSetPressed(boolean pressed) { 6319 } 6320 6321 /** 6322 * Indicates whether the view is currently in pressed state. Unless 6323 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6324 * the pressed state. 6325 * 6326 * @see #setPressed(boolean) 6327 * @see #isClickable() 6328 * @see #setClickable(boolean) 6329 * 6330 * @return true if the view is currently pressed, false otherwise 6331 */ 6332 public boolean isPressed() { 6333 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6334 } 6335 6336 /** 6337 * Indicates whether this view will save its state (that is, 6338 * whether its {@link #onSaveInstanceState} method will be called). 6339 * 6340 * @return Returns true if the view state saving is enabled, else false. 6341 * 6342 * @see #setSaveEnabled(boolean) 6343 * @attr ref android.R.styleable#View_saveEnabled 6344 */ 6345 public boolean isSaveEnabled() { 6346 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6347 } 6348 6349 /** 6350 * Controls whether the saving of this view's state is 6351 * enabled (that is, whether its {@link #onSaveInstanceState} method 6352 * will be called). Note that even if freezing is enabled, the 6353 * view still must have an id assigned to it (via {@link #setId(int)}) 6354 * for its state to be saved. This flag can only disable the 6355 * saving of this view; any child views may still have their state saved. 6356 * 6357 * @param enabled Set to false to <em>disable</em> state saving, or true 6358 * (the default) to allow it. 6359 * 6360 * @see #isSaveEnabled() 6361 * @see #setId(int) 6362 * @see #onSaveInstanceState() 6363 * @attr ref android.R.styleable#View_saveEnabled 6364 */ 6365 public void setSaveEnabled(boolean enabled) { 6366 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6367 } 6368 6369 /** 6370 * Gets whether the framework should discard touches when the view's 6371 * window is obscured by another visible window. 6372 * Refer to the {@link View} security documentation for more details. 6373 * 6374 * @return True if touch filtering is enabled. 6375 * 6376 * @see #setFilterTouchesWhenObscured(boolean) 6377 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6378 */ 6379 @ViewDebug.ExportedProperty 6380 public boolean getFilterTouchesWhenObscured() { 6381 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6382 } 6383 6384 /** 6385 * Sets whether the framework should discard touches when the view's 6386 * window is obscured by another visible window. 6387 * Refer to the {@link View} security documentation for more details. 6388 * 6389 * @param enabled True if touch filtering should be enabled. 6390 * 6391 * @see #getFilterTouchesWhenObscured 6392 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6393 */ 6394 public void setFilterTouchesWhenObscured(boolean enabled) { 6395 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6396 FILTER_TOUCHES_WHEN_OBSCURED); 6397 } 6398 6399 /** 6400 * Indicates whether the entire hierarchy under this view will save its 6401 * state when a state saving traversal occurs from its parent. The default 6402 * is true; if false, these views will not be saved unless 6403 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6404 * 6405 * @return Returns true if the view state saving from parent is enabled, else false. 6406 * 6407 * @see #setSaveFromParentEnabled(boolean) 6408 */ 6409 public boolean isSaveFromParentEnabled() { 6410 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6411 } 6412 6413 /** 6414 * Controls whether the entire hierarchy under this view will save its 6415 * state when a state saving traversal occurs from its parent. The default 6416 * is true; if false, these views will not be saved unless 6417 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6418 * 6419 * @param enabled Set to false to <em>disable</em> state saving, or true 6420 * (the default) to allow it. 6421 * 6422 * @see #isSaveFromParentEnabled() 6423 * @see #setId(int) 6424 * @see #onSaveInstanceState() 6425 */ 6426 public void setSaveFromParentEnabled(boolean enabled) { 6427 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6428 } 6429 6430 6431 /** 6432 * Returns whether this View is able to take focus. 6433 * 6434 * @return True if this view can take focus, or false otherwise. 6435 * @attr ref android.R.styleable#View_focusable 6436 */ 6437 @ViewDebug.ExportedProperty(category = "focus") 6438 public final boolean isFocusable() { 6439 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6440 } 6441 6442 /** 6443 * When a view is focusable, it may not want to take focus when in touch mode. 6444 * For example, a button would like focus when the user is navigating via a D-pad 6445 * so that the user can click on it, but once the user starts touching the screen, 6446 * the button shouldn't take focus 6447 * @return Whether the view is focusable in touch mode. 6448 * @attr ref android.R.styleable#View_focusableInTouchMode 6449 */ 6450 @ViewDebug.ExportedProperty 6451 public final boolean isFocusableInTouchMode() { 6452 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6453 } 6454 6455 /** 6456 * Find the nearest view in the specified direction that can take focus. 6457 * This does not actually give focus to that view. 6458 * 6459 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6460 * 6461 * @return The nearest focusable in the specified direction, or null if none 6462 * can be found. 6463 */ 6464 public View focusSearch(int direction) { 6465 if (mParent != null) { 6466 return mParent.focusSearch(this, direction); 6467 } else { 6468 return null; 6469 } 6470 } 6471 6472 /** 6473 * This method is the last chance for the focused view and its ancestors to 6474 * respond to an arrow key. This is called when the focused view did not 6475 * consume the key internally, nor could the view system find a new view in 6476 * the requested direction to give focus to. 6477 * 6478 * @param focused The currently focused view. 6479 * @param direction The direction focus wants to move. One of FOCUS_UP, 6480 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6481 * @return True if the this view consumed this unhandled move. 6482 */ 6483 public boolean dispatchUnhandledMove(View focused, int direction) { 6484 return false; 6485 } 6486 6487 /** 6488 * If a user manually specified the next view id for a particular direction, 6489 * use the root to look up the view. 6490 * @param root The root view of the hierarchy containing this view. 6491 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6492 * or FOCUS_BACKWARD. 6493 * @return The user specified next view, or null if there is none. 6494 */ 6495 View findUserSetNextFocus(View root, int direction) { 6496 switch (direction) { 6497 case FOCUS_LEFT: 6498 if (mNextFocusLeftId == View.NO_ID) return null; 6499 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6500 case FOCUS_RIGHT: 6501 if (mNextFocusRightId == View.NO_ID) return null; 6502 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6503 case FOCUS_UP: 6504 if (mNextFocusUpId == View.NO_ID) return null; 6505 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6506 case FOCUS_DOWN: 6507 if (mNextFocusDownId == View.NO_ID) return null; 6508 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6509 case FOCUS_FORWARD: 6510 if (mNextFocusForwardId == View.NO_ID) return null; 6511 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6512 case FOCUS_BACKWARD: { 6513 if (mID == View.NO_ID) return null; 6514 final int id = mID; 6515 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6516 @Override 6517 public boolean apply(View t) { 6518 return t.mNextFocusForwardId == id; 6519 } 6520 }); 6521 } 6522 } 6523 return null; 6524 } 6525 6526 private View findViewInsideOutShouldExist(View root, int id) { 6527 if (mMatchIdPredicate == null) { 6528 mMatchIdPredicate = new MatchIdPredicate(); 6529 } 6530 mMatchIdPredicate.mId = id; 6531 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6532 if (result == null) { 6533 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6534 } 6535 return result; 6536 } 6537 6538 /** 6539 * Find and return all focusable views that are descendants of this view, 6540 * possibly including this view if it is focusable itself. 6541 * 6542 * @param direction The direction of the focus 6543 * @return A list of focusable views 6544 */ 6545 public ArrayList<View> getFocusables(int direction) { 6546 ArrayList<View> result = new ArrayList<View>(24); 6547 addFocusables(result, direction); 6548 return result; 6549 } 6550 6551 /** 6552 * Add any focusable views that are descendants of this view (possibly 6553 * including this view if it is focusable itself) to views. If we are in touch mode, 6554 * only add views that are also focusable in touch mode. 6555 * 6556 * @param views Focusable views found so far 6557 * @param direction The direction of the focus 6558 */ 6559 public void addFocusables(ArrayList<View> views, int direction) { 6560 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6561 } 6562 6563 /** 6564 * Adds any focusable views that are descendants of this view (possibly 6565 * including this view if it is focusable itself) to views. This method 6566 * adds all focusable views regardless if we are in touch mode or 6567 * only views focusable in touch mode if we are in touch mode or 6568 * only views that can take accessibility focus if accessibility is enabeld 6569 * depending on the focusable mode paramater. 6570 * 6571 * @param views Focusable views found so far or null if all we are interested is 6572 * the number of focusables. 6573 * @param direction The direction of the focus. 6574 * @param focusableMode The type of focusables to be added. 6575 * 6576 * @see #FOCUSABLES_ALL 6577 * @see #FOCUSABLES_TOUCH_MODE 6578 */ 6579 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6580 if (views == null) { 6581 return; 6582 } 6583 if (!isFocusable()) { 6584 return; 6585 } 6586 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6587 && isInTouchMode() && !isFocusableInTouchMode()) { 6588 return; 6589 } 6590 views.add(this); 6591 } 6592 6593 /** 6594 * Finds the Views that contain given text. The containment is case insensitive. 6595 * The search is performed by either the text that the View renders or the content 6596 * description that describes the view for accessibility purposes and the view does 6597 * not render or both. Clients can specify how the search is to be performed via 6598 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6599 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6600 * 6601 * @param outViews The output list of matching Views. 6602 * @param searched The text to match against. 6603 * 6604 * @see #FIND_VIEWS_WITH_TEXT 6605 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6606 * @see #setContentDescription(CharSequence) 6607 */ 6608 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6609 if (getAccessibilityNodeProvider() != null) { 6610 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6611 outViews.add(this); 6612 } 6613 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6614 && (searched != null && searched.length() > 0) 6615 && (mContentDescription != null && mContentDescription.length() > 0)) { 6616 String searchedLowerCase = searched.toString().toLowerCase(); 6617 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6618 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6619 outViews.add(this); 6620 } 6621 } 6622 } 6623 6624 /** 6625 * Find and return all touchable views that are descendants of this view, 6626 * possibly including this view if it is touchable itself. 6627 * 6628 * @return A list of touchable views 6629 */ 6630 public ArrayList<View> getTouchables() { 6631 ArrayList<View> result = new ArrayList<View>(); 6632 addTouchables(result); 6633 return result; 6634 } 6635 6636 /** 6637 * Add any touchable views that are descendants of this view (possibly 6638 * including this view if it is touchable itself) to views. 6639 * 6640 * @param views Touchable views found so far 6641 */ 6642 public void addTouchables(ArrayList<View> views) { 6643 final int viewFlags = mViewFlags; 6644 6645 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6646 && (viewFlags & ENABLED_MASK) == ENABLED) { 6647 views.add(this); 6648 } 6649 } 6650 6651 /** 6652 * Returns whether this View is accessibility focused. 6653 * 6654 * @return True if this View is accessibility focused. 6655 */ 6656 boolean isAccessibilityFocused() { 6657 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6658 } 6659 6660 /** 6661 * Call this to try to give accessibility focus to this view. 6662 * 6663 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6664 * returns false or the view is no visible or the view already has accessibility 6665 * focus. 6666 * 6667 * See also {@link #focusSearch(int)}, which is what you call to say that you 6668 * have focus, and you want your parent to look for the next one. 6669 * 6670 * @return Whether this view actually took accessibility focus. 6671 * 6672 * @hide 6673 */ 6674 public boolean requestAccessibilityFocus() { 6675 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6676 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6677 return false; 6678 } 6679 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6680 return false; 6681 } 6682 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6683 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6684 ViewRootImpl viewRootImpl = getViewRootImpl(); 6685 if (viewRootImpl != null) { 6686 viewRootImpl.setAccessibilityFocus(this, null); 6687 } 6688 invalidate(); 6689 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6690 return true; 6691 } 6692 return false; 6693 } 6694 6695 /** 6696 * Call this to try to clear accessibility focus of this view. 6697 * 6698 * See also {@link #focusSearch(int)}, which is what you call to say that you 6699 * have focus, and you want your parent to look for the next one. 6700 * 6701 * @hide 6702 */ 6703 public void clearAccessibilityFocus() { 6704 clearAccessibilityFocusNoCallbacks(); 6705 // Clear the global reference of accessibility focus if this 6706 // view or any of its descendants had accessibility focus. 6707 ViewRootImpl viewRootImpl = getViewRootImpl(); 6708 if (viewRootImpl != null) { 6709 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6710 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6711 viewRootImpl.setAccessibilityFocus(null, null); 6712 } 6713 } 6714 } 6715 6716 private void sendAccessibilityHoverEvent(int eventType) { 6717 // Since we are not delivering to a client accessibility events from not 6718 // important views (unless the clinet request that) we need to fire the 6719 // event from the deepest view exposed to the client. As a consequence if 6720 // the user crosses a not exposed view the client will see enter and exit 6721 // of the exposed predecessor followed by and enter and exit of that same 6722 // predecessor when entering and exiting the not exposed descendant. This 6723 // is fine since the client has a clear idea which view is hovered at the 6724 // price of a couple more events being sent. This is a simple and 6725 // working solution. 6726 View source = this; 6727 while (true) { 6728 if (source.includeForAccessibility()) { 6729 source.sendAccessibilityEvent(eventType); 6730 return; 6731 } 6732 ViewParent parent = source.getParent(); 6733 if (parent instanceof View) { 6734 source = (View) parent; 6735 } else { 6736 return; 6737 } 6738 } 6739 } 6740 6741 /** 6742 * Clears accessibility focus without calling any callback methods 6743 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6744 * is used for clearing accessibility focus when giving this focus to 6745 * another view. 6746 */ 6747 void clearAccessibilityFocusNoCallbacks() { 6748 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6749 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6750 invalidate(); 6751 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6752 } 6753 } 6754 6755 /** 6756 * Call this to try to give focus to a specific view or to one of its 6757 * descendants. 6758 * 6759 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6760 * false), or if it is focusable and it is not focusable in touch mode 6761 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6762 * 6763 * See also {@link #focusSearch(int)}, which is what you call to say that you 6764 * have focus, and you want your parent to look for the next one. 6765 * 6766 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6767 * {@link #FOCUS_DOWN} and <code>null</code>. 6768 * 6769 * @return Whether this view or one of its descendants actually took focus. 6770 */ 6771 public final boolean requestFocus() { 6772 return requestFocus(View.FOCUS_DOWN); 6773 } 6774 6775 /** 6776 * Call this to try to give focus to a specific view or to one of its 6777 * descendants and give it a hint about what direction focus is heading. 6778 * 6779 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6780 * false), or if it is focusable and it is not focusable in touch mode 6781 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6782 * 6783 * See also {@link #focusSearch(int)}, which is what you call to say that you 6784 * have focus, and you want your parent to look for the next one. 6785 * 6786 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6787 * <code>null</code> set for the previously focused rectangle. 6788 * 6789 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6790 * @return Whether this view or one of its descendants actually took focus. 6791 */ 6792 public final boolean requestFocus(int direction) { 6793 return requestFocus(direction, null); 6794 } 6795 6796 /** 6797 * Call this to try to give focus to a specific view or to one of its descendants 6798 * and give it hints about the direction and a specific rectangle that the focus 6799 * is coming from. The rectangle can help give larger views a finer grained hint 6800 * about where focus is coming from, and therefore, where to show selection, or 6801 * forward focus change internally. 6802 * 6803 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6804 * false), or if it is focusable and it is not focusable in touch mode 6805 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6806 * 6807 * A View will not take focus if it is not visible. 6808 * 6809 * A View will not take focus if one of its parents has 6810 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6811 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6812 * 6813 * See also {@link #focusSearch(int)}, which is what you call to say that you 6814 * have focus, and you want your parent to look for the next one. 6815 * 6816 * You may wish to override this method if your custom {@link View} has an internal 6817 * {@link View} that it wishes to forward the request to. 6818 * 6819 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6820 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6821 * to give a finer grained hint about where focus is coming from. May be null 6822 * if there is no hint. 6823 * @return Whether this view or one of its descendants actually took focus. 6824 */ 6825 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6826 return requestFocusNoSearch(direction, previouslyFocusedRect); 6827 } 6828 6829 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6830 // need to be focusable 6831 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6832 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6833 return false; 6834 } 6835 6836 // need to be focusable in touch mode if in touch mode 6837 if (isInTouchMode() && 6838 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6839 return false; 6840 } 6841 6842 // need to not have any parents blocking us 6843 if (hasAncestorThatBlocksDescendantFocus()) { 6844 return false; 6845 } 6846 6847 handleFocusGainInternal(direction, previouslyFocusedRect); 6848 return true; 6849 } 6850 6851 /** 6852 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6853 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6854 * touch mode to request focus when they are touched. 6855 * 6856 * @return Whether this view or one of its descendants actually took focus. 6857 * 6858 * @see #isInTouchMode() 6859 * 6860 */ 6861 public final boolean requestFocusFromTouch() { 6862 // Leave touch mode if we need to 6863 if (isInTouchMode()) { 6864 ViewRootImpl viewRoot = getViewRootImpl(); 6865 if (viewRoot != null) { 6866 viewRoot.ensureTouchMode(false); 6867 } 6868 } 6869 return requestFocus(View.FOCUS_DOWN); 6870 } 6871 6872 /** 6873 * @return Whether any ancestor of this view blocks descendant focus. 6874 */ 6875 private boolean hasAncestorThatBlocksDescendantFocus() { 6876 ViewParent ancestor = mParent; 6877 while (ancestor instanceof ViewGroup) { 6878 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6879 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6880 return true; 6881 } else { 6882 ancestor = vgAncestor.getParent(); 6883 } 6884 } 6885 return false; 6886 } 6887 6888 /** 6889 * Gets the mode for determining whether this View is important for accessibility 6890 * which is if it fires accessibility events and if it is reported to 6891 * accessibility services that query the screen. 6892 * 6893 * @return The mode for determining whether a View is important for accessibility. 6894 * 6895 * @attr ref android.R.styleable#View_importantForAccessibility 6896 * 6897 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6898 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6899 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6900 */ 6901 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6902 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6903 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6904 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6905 }) 6906 public int getImportantForAccessibility() { 6907 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6908 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6909 } 6910 6911 /** 6912 * Sets how to determine whether this view is important for accessibility 6913 * which is if it fires accessibility events and if it is reported to 6914 * accessibility services that query the screen. 6915 * 6916 * @param mode How to determine whether this view is important for accessibility. 6917 * 6918 * @attr ref android.R.styleable#View_importantForAccessibility 6919 * 6920 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6921 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6922 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6923 */ 6924 public void setImportantForAccessibility(int mode) { 6925 final boolean oldIncludeForAccessibility = includeForAccessibility(); 6926 if (mode != getImportantForAccessibility()) { 6927 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6928 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6929 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6930 if (oldIncludeForAccessibility != includeForAccessibility()) { 6931 notifySubtreeAccessibilityStateChangedIfNeeded(); 6932 } else { 6933 notifyViewAccessibilityStateChangedIfNeeded(); 6934 } 6935 } 6936 } 6937 6938 /** 6939 * Gets whether this view should be exposed for accessibility. 6940 * 6941 * @return Whether the view is exposed for accessibility. 6942 * 6943 * @hide 6944 */ 6945 public boolean isImportantForAccessibility() { 6946 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6947 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6948 switch (mode) { 6949 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6950 return true; 6951 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6952 return false; 6953 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6954 return isActionableForAccessibility() || hasListenersForAccessibility() 6955 || getAccessibilityNodeProvider() != null; 6956 default: 6957 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6958 + mode); 6959 } 6960 } 6961 6962 /** 6963 * Gets the parent for accessibility purposes. Note that the parent for 6964 * accessibility is not necessary the immediate parent. It is the first 6965 * predecessor that is important for accessibility. 6966 * 6967 * @return The parent for accessibility purposes. 6968 */ 6969 public ViewParent getParentForAccessibility() { 6970 if (mParent instanceof View) { 6971 View parentView = (View) mParent; 6972 if (parentView.includeForAccessibility()) { 6973 return mParent; 6974 } else { 6975 return mParent.getParentForAccessibility(); 6976 } 6977 } 6978 return null; 6979 } 6980 6981 /** 6982 * Adds the children of a given View for accessibility. Since some Views are 6983 * not important for accessibility the children for accessibility are not 6984 * necessarily direct children of the view, rather they are the first level of 6985 * descendants important for accessibility. 6986 * 6987 * @param children The list of children for accessibility. 6988 */ 6989 public void addChildrenForAccessibility(ArrayList<View> children) { 6990 if (includeForAccessibility()) { 6991 children.add(this); 6992 } 6993 } 6994 6995 /** 6996 * Whether to regard this view for accessibility. A view is regarded for 6997 * accessibility if it is important for accessibility or the querying 6998 * accessibility service has explicitly requested that view not 6999 * important for accessibility are regarded. 7000 * 7001 * @return Whether to regard the view for accessibility. 7002 * 7003 * @hide 7004 */ 7005 public boolean includeForAccessibility() { 7006 //noinspection SimplifiableIfStatement 7007 if (mAttachInfo != null) { 7008 return (mAttachInfo.mAccessibilityFetchFlags 7009 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 7010 || isImportantForAccessibility(); 7011 } 7012 return false; 7013 } 7014 7015 /** 7016 * Returns whether the View is considered actionable from 7017 * accessibility perspective. Such view are important for 7018 * accessibility. 7019 * 7020 * @return True if the view is actionable for accessibility. 7021 * 7022 * @hide 7023 */ 7024 public boolean isActionableForAccessibility() { 7025 return (isClickable() || isLongClickable() || isFocusable()); 7026 } 7027 7028 /** 7029 * Returns whether the View has registered callbacks wich makes it 7030 * important for accessibility. 7031 * 7032 * @return True if the view is actionable for accessibility. 7033 */ 7034 private boolean hasListenersForAccessibility() { 7035 ListenerInfo info = getListenerInfo(); 7036 return mTouchDelegate != null || info.mOnKeyListener != null 7037 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 7038 || info.mOnHoverListener != null || info.mOnDragListener != null; 7039 } 7040 7041 /** 7042 * Notifies that the accessibility state of this view changed. The change 7043 * is local to this view and does not represent structural changes such 7044 * as children and parent. For example, the view became focusable. The 7045 * notification is at at most once every 7046 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7047 * to avoid unnecessary load to the system. Also once a view has a pending 7048 * notifucation this method is a NOP until the notification has been sent. 7049 * 7050 * @hide 7051 */ 7052 public void notifyViewAccessibilityStateChangedIfNeeded() { 7053 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7054 return; 7055 } 7056 if (mSendViewStateChangedAccessibilityEvent == null) { 7057 mSendViewStateChangedAccessibilityEvent = 7058 new SendViewStateChangedAccessibilityEvent(); 7059 } 7060 mSendViewStateChangedAccessibilityEvent.runOrPost(); 7061 } 7062 7063 /** 7064 * Notifies that the accessibility state of this view changed. The change 7065 * is *not* local to this view and does represent structural changes such 7066 * as children and parent. For example, the view size changed. The 7067 * notification is at at most once every 7068 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7069 * to avoid unnecessary load to the system. Also once a view has a pending 7070 * notifucation this method is a NOP until the notification has been sent. 7071 * 7072 * @hide 7073 */ 7074 public void notifySubtreeAccessibilityStateChangedIfNeeded() { 7075 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7076 return; 7077 } 7078 if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) { 7079 mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7080 if (mParent != null) { 7081 try { 7082 mParent.childAccessibilityStateChanged(this); 7083 } catch (AbstractMethodError e) { 7084 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 7085 " does not fully implement ViewParent", e); 7086 } 7087 } 7088 } 7089 } 7090 7091 /** 7092 * Reset the flag indicating the accessibility state of the subtree rooted 7093 * at this view changed. 7094 */ 7095 void resetSubtreeAccessibilityStateChanged() { 7096 mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7097 } 7098 7099 /** 7100 * Performs the specified accessibility action on the view. For 7101 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 7102 * <p> 7103 * If an {@link AccessibilityDelegate} has been specified via calling 7104 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 7105 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 7106 * is responsible for handling this call. 7107 * </p> 7108 * 7109 * @param action The action to perform. 7110 * @param arguments Optional action arguments. 7111 * @return Whether the action was performed. 7112 */ 7113 public boolean performAccessibilityAction(int action, Bundle arguments) { 7114 if (mAccessibilityDelegate != null) { 7115 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 7116 } else { 7117 return performAccessibilityActionInternal(action, arguments); 7118 } 7119 } 7120 7121 /** 7122 * @see #performAccessibilityAction(int, Bundle) 7123 * 7124 * Note: Called from the default {@link AccessibilityDelegate}. 7125 */ 7126 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 7127 switch (action) { 7128 case AccessibilityNodeInfo.ACTION_CLICK: { 7129 if (isClickable()) { 7130 performClick(); 7131 return true; 7132 } 7133 } break; 7134 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 7135 if (isLongClickable()) { 7136 performLongClick(); 7137 return true; 7138 } 7139 } break; 7140 case AccessibilityNodeInfo.ACTION_FOCUS: { 7141 if (!hasFocus()) { 7142 // Get out of touch mode since accessibility 7143 // wants to move focus around. 7144 getViewRootImpl().ensureTouchMode(false); 7145 return requestFocus(); 7146 } 7147 } break; 7148 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 7149 if (hasFocus()) { 7150 clearFocus(); 7151 return !isFocused(); 7152 } 7153 } break; 7154 case AccessibilityNodeInfo.ACTION_SELECT: { 7155 if (!isSelected()) { 7156 setSelected(true); 7157 return isSelected(); 7158 } 7159 } break; 7160 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 7161 if (isSelected()) { 7162 setSelected(false); 7163 return !isSelected(); 7164 } 7165 } break; 7166 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 7167 if (!isAccessibilityFocused()) { 7168 return requestAccessibilityFocus(); 7169 } 7170 } break; 7171 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 7172 if (isAccessibilityFocused()) { 7173 clearAccessibilityFocus(); 7174 return true; 7175 } 7176 } break; 7177 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 7178 if (arguments != null) { 7179 final int granularity = arguments.getInt( 7180 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7181 final boolean extendSelection = arguments.getBoolean( 7182 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7183 return traverseAtGranularity(granularity, true, extendSelection); 7184 } 7185 } break; 7186 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 7187 if (arguments != null) { 7188 final int granularity = arguments.getInt( 7189 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7190 final boolean extendSelection = arguments.getBoolean( 7191 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7192 return traverseAtGranularity(granularity, false, extendSelection); 7193 } 7194 } break; 7195 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 7196 CharSequence text = getIterableTextForAccessibility(); 7197 if (text == null) { 7198 return false; 7199 } 7200 final int start = (arguments != null) ? arguments.getInt( 7201 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 7202 final int end = (arguments != null) ? arguments.getInt( 7203 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 7204 // Only cursor position can be specified (selection length == 0) 7205 if ((getAccessibilitySelectionStart() != start 7206 || getAccessibilitySelectionEnd() != end) 7207 && (start == end)) { 7208 setAccessibilitySelection(start, end); 7209 notifyViewAccessibilityStateChangedIfNeeded(); 7210 return true; 7211 } 7212 } break; 7213 } 7214 return false; 7215 } 7216 7217 private boolean traverseAtGranularity(int granularity, boolean forward, 7218 boolean extendSelection) { 7219 CharSequence text = getIterableTextForAccessibility(); 7220 if (text == null || text.length() == 0) { 7221 return false; 7222 } 7223 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7224 if (iterator == null) { 7225 return false; 7226 } 7227 int current = getAccessibilitySelectionEnd(); 7228 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7229 current = forward ? 0 : text.length(); 7230 } 7231 final int[] range = forward ? iterator.following(current) : iterator.preceding(current); 7232 if (range == null) { 7233 return false; 7234 } 7235 final int segmentStart = range[0]; 7236 final int segmentEnd = range[1]; 7237 int selectionStart; 7238 int selectionEnd; 7239 if (extendSelection && isAccessibilitySelectionExtendable()) { 7240 selectionStart = getAccessibilitySelectionStart(); 7241 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7242 selectionStart = forward ? segmentStart : segmentEnd; 7243 } 7244 selectionEnd = forward ? segmentEnd : segmentStart; 7245 } else { 7246 selectionStart = selectionEnd= forward ? segmentEnd : segmentStart; 7247 } 7248 setAccessibilitySelection(selectionStart, selectionEnd); 7249 final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY 7250 : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY; 7251 sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd); 7252 return true; 7253 } 7254 7255 /** 7256 * Gets the text reported for accessibility purposes. 7257 * 7258 * @return The accessibility text. 7259 * 7260 * @hide 7261 */ 7262 public CharSequence getIterableTextForAccessibility() { 7263 return getContentDescription(); 7264 } 7265 7266 /** 7267 * Gets whether accessibility selection can be extended. 7268 * 7269 * @return If selection is extensible. 7270 * 7271 * @hide 7272 */ 7273 public boolean isAccessibilitySelectionExtendable() { 7274 return false; 7275 } 7276 7277 /** 7278 * @hide 7279 */ 7280 public int getAccessibilitySelectionStart() { 7281 return mAccessibilityCursorPosition; 7282 } 7283 7284 /** 7285 * @hide 7286 */ 7287 public int getAccessibilitySelectionEnd() { 7288 return getAccessibilitySelectionStart(); 7289 } 7290 7291 /** 7292 * @hide 7293 */ 7294 public void setAccessibilitySelection(int start, int end) { 7295 if (start == end && end == mAccessibilityCursorPosition) { 7296 return; 7297 } 7298 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 7299 mAccessibilityCursorPosition = start; 7300 } else { 7301 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 7302 } 7303 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 7304 } 7305 7306 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7307 int fromIndex, int toIndex) { 7308 if (mParent == null) { 7309 return; 7310 } 7311 AccessibilityEvent event = AccessibilityEvent.obtain( 7312 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7313 onInitializeAccessibilityEvent(event); 7314 onPopulateAccessibilityEvent(event); 7315 event.setFromIndex(fromIndex); 7316 event.setToIndex(toIndex); 7317 event.setAction(action); 7318 event.setMovementGranularity(granularity); 7319 mParent.requestSendAccessibilityEvent(this, event); 7320 } 7321 7322 /** 7323 * @hide 7324 */ 7325 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7326 switch (granularity) { 7327 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7328 CharSequence text = getIterableTextForAccessibility(); 7329 if (text != null && text.length() > 0) { 7330 CharacterTextSegmentIterator iterator = 7331 CharacterTextSegmentIterator.getInstance( 7332 mContext.getResources().getConfiguration().locale); 7333 iterator.initialize(text.toString()); 7334 return iterator; 7335 } 7336 } break; 7337 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7338 CharSequence text = getIterableTextForAccessibility(); 7339 if (text != null && text.length() > 0) { 7340 WordTextSegmentIterator iterator = 7341 WordTextSegmentIterator.getInstance( 7342 mContext.getResources().getConfiguration().locale); 7343 iterator.initialize(text.toString()); 7344 return iterator; 7345 } 7346 } break; 7347 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7348 CharSequence text = getIterableTextForAccessibility(); 7349 if (text != null && text.length() > 0) { 7350 ParagraphTextSegmentIterator iterator = 7351 ParagraphTextSegmentIterator.getInstance(); 7352 iterator.initialize(text.toString()); 7353 return iterator; 7354 } 7355 } break; 7356 } 7357 return null; 7358 } 7359 7360 /** 7361 * @hide 7362 */ 7363 public void dispatchStartTemporaryDetach() { 7364 clearAccessibilityFocus(); 7365 clearDisplayList(); 7366 7367 onStartTemporaryDetach(); 7368 } 7369 7370 /** 7371 * This is called when a container is going to temporarily detach a child, with 7372 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7373 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7374 * {@link #onDetachedFromWindow()} when the container is done. 7375 */ 7376 public void onStartTemporaryDetach() { 7377 removeUnsetPressCallback(); 7378 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7379 } 7380 7381 /** 7382 * @hide 7383 */ 7384 public void dispatchFinishTemporaryDetach() { 7385 onFinishTemporaryDetach(); 7386 } 7387 7388 /** 7389 * Called after {@link #onStartTemporaryDetach} when the container is done 7390 * changing the view. 7391 */ 7392 public void onFinishTemporaryDetach() { 7393 } 7394 7395 /** 7396 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7397 * for this view's window. Returns null if the view is not currently attached 7398 * to the window. Normally you will not need to use this directly, but 7399 * just use the standard high-level event callbacks like 7400 * {@link #onKeyDown(int, KeyEvent)}. 7401 */ 7402 public KeyEvent.DispatcherState getKeyDispatcherState() { 7403 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7404 } 7405 7406 /** 7407 * Dispatch a key event before it is processed by any input method 7408 * associated with the view hierarchy. This can be used to intercept 7409 * key events in special situations before the IME consumes them; a 7410 * typical example would be handling the BACK key to update the application's 7411 * UI instead of allowing the IME to see it and close itself. 7412 * 7413 * @param event The key event to be dispatched. 7414 * @return True if the event was handled, false otherwise. 7415 */ 7416 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7417 return onKeyPreIme(event.getKeyCode(), event); 7418 } 7419 7420 /** 7421 * Dispatch a key event to the next view on the focus path. This path runs 7422 * from the top of the view tree down to the currently focused view. If this 7423 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7424 * the next node down the focus path. This method also fires any key 7425 * listeners. 7426 * 7427 * @param event The key event to be dispatched. 7428 * @return True if the event was handled, false otherwise. 7429 */ 7430 public boolean dispatchKeyEvent(KeyEvent event) { 7431 if (mInputEventConsistencyVerifier != null) { 7432 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7433 } 7434 7435 // Give any attached key listener a first crack at the event. 7436 //noinspection SimplifiableIfStatement 7437 ListenerInfo li = mListenerInfo; 7438 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7439 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7440 return true; 7441 } 7442 7443 if (event.dispatch(this, mAttachInfo != null 7444 ? mAttachInfo.mKeyDispatchState : null, this)) { 7445 return true; 7446 } 7447 7448 if (mInputEventConsistencyVerifier != null) { 7449 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7450 } 7451 return false; 7452 } 7453 7454 /** 7455 * Dispatches a key shortcut event. 7456 * 7457 * @param event The key event to be dispatched. 7458 * @return True if the event was handled by the view, false otherwise. 7459 */ 7460 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7461 return onKeyShortcut(event.getKeyCode(), event); 7462 } 7463 7464 /** 7465 * Pass the touch screen motion event down to the target view, or this 7466 * view if it is the target. 7467 * 7468 * @param event The motion event to be dispatched. 7469 * @return True if the event was handled by the view, false otherwise. 7470 */ 7471 public boolean dispatchTouchEvent(MotionEvent event) { 7472 if (mInputEventConsistencyVerifier != null) { 7473 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7474 } 7475 7476 if (onFilterTouchEventForSecurity(event)) { 7477 //noinspection SimplifiableIfStatement 7478 ListenerInfo li = mListenerInfo; 7479 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7480 && li.mOnTouchListener.onTouch(this, event)) { 7481 return true; 7482 } 7483 7484 if (onTouchEvent(event)) { 7485 return true; 7486 } 7487 } 7488 7489 if (mInputEventConsistencyVerifier != null) { 7490 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7491 } 7492 return false; 7493 } 7494 7495 /** 7496 * Filter the touch event to apply security policies. 7497 * 7498 * @param event The motion event to be filtered. 7499 * @return True if the event should be dispatched, false if the event should be dropped. 7500 * 7501 * @see #getFilterTouchesWhenObscured 7502 */ 7503 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7504 //noinspection RedundantIfStatement 7505 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7506 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7507 // Window is obscured, drop this touch. 7508 return false; 7509 } 7510 return true; 7511 } 7512 7513 /** 7514 * Pass a trackball motion event down to the focused view. 7515 * 7516 * @param event The motion event to be dispatched. 7517 * @return True if the event was handled by the view, false otherwise. 7518 */ 7519 public boolean dispatchTrackballEvent(MotionEvent event) { 7520 if (mInputEventConsistencyVerifier != null) { 7521 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7522 } 7523 7524 return onTrackballEvent(event); 7525 } 7526 7527 /** 7528 * Dispatch a generic motion event. 7529 * <p> 7530 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7531 * are delivered to the view under the pointer. All other generic motion events are 7532 * delivered to the focused view. Hover events are handled specially and are delivered 7533 * to {@link #onHoverEvent(MotionEvent)}. 7534 * </p> 7535 * 7536 * @param event The motion event to be dispatched. 7537 * @return True if the event was handled by the view, false otherwise. 7538 */ 7539 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7540 if (mInputEventConsistencyVerifier != null) { 7541 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7542 } 7543 7544 final int source = event.getSource(); 7545 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7546 final int action = event.getAction(); 7547 if (action == MotionEvent.ACTION_HOVER_ENTER 7548 || action == MotionEvent.ACTION_HOVER_MOVE 7549 || action == MotionEvent.ACTION_HOVER_EXIT) { 7550 if (dispatchHoverEvent(event)) { 7551 return true; 7552 } 7553 } else if (dispatchGenericPointerEvent(event)) { 7554 return true; 7555 } 7556 } else if (dispatchGenericFocusedEvent(event)) { 7557 return true; 7558 } 7559 7560 if (dispatchGenericMotionEventInternal(event)) { 7561 return true; 7562 } 7563 7564 if (mInputEventConsistencyVerifier != null) { 7565 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7566 } 7567 return false; 7568 } 7569 7570 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7571 //noinspection SimplifiableIfStatement 7572 ListenerInfo li = mListenerInfo; 7573 if (li != null && li.mOnGenericMotionListener != null 7574 && (mViewFlags & ENABLED_MASK) == ENABLED 7575 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7576 return true; 7577 } 7578 7579 if (onGenericMotionEvent(event)) { 7580 return true; 7581 } 7582 7583 if (mInputEventConsistencyVerifier != null) { 7584 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7585 } 7586 return false; 7587 } 7588 7589 /** 7590 * Dispatch a hover event. 7591 * <p> 7592 * Do not call this method directly. 7593 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7594 * </p> 7595 * 7596 * @param event The motion event to be dispatched. 7597 * @return True if the event was handled by the view, false otherwise. 7598 */ 7599 protected boolean dispatchHoverEvent(MotionEvent event) { 7600 ListenerInfo li = mListenerInfo; 7601 //noinspection SimplifiableIfStatement 7602 if (li != null && li.mOnHoverListener != null 7603 && (mViewFlags & ENABLED_MASK) == ENABLED 7604 && li.mOnHoverListener.onHover(this, event)) { 7605 return true; 7606 } 7607 7608 return onHoverEvent(event); 7609 } 7610 7611 /** 7612 * Returns true if the view has a child to which it has recently sent 7613 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7614 * it does not have a hovered child, then it must be the innermost hovered view. 7615 * @hide 7616 */ 7617 protected boolean hasHoveredChild() { 7618 return false; 7619 } 7620 7621 /** 7622 * Dispatch a generic motion event to the view under the first pointer. 7623 * <p> 7624 * Do not call this method directly. 7625 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7626 * </p> 7627 * 7628 * @param event The motion event to be dispatched. 7629 * @return True if the event was handled by the view, false otherwise. 7630 */ 7631 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7632 return false; 7633 } 7634 7635 /** 7636 * Dispatch a generic motion event to the currently focused view. 7637 * <p> 7638 * Do not call this method directly. 7639 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7640 * </p> 7641 * 7642 * @param event The motion event to be dispatched. 7643 * @return True if the event was handled by the view, false otherwise. 7644 */ 7645 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7646 return false; 7647 } 7648 7649 /** 7650 * Dispatch a pointer event. 7651 * <p> 7652 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7653 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7654 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7655 * and should not be expected to handle other pointing device features. 7656 * </p> 7657 * 7658 * @param event The motion event to be dispatched. 7659 * @return True if the event was handled by the view, false otherwise. 7660 * @hide 7661 */ 7662 public final boolean dispatchPointerEvent(MotionEvent event) { 7663 if (event.isTouchEvent()) { 7664 return dispatchTouchEvent(event); 7665 } else { 7666 return dispatchGenericMotionEvent(event); 7667 } 7668 } 7669 7670 /** 7671 * Called when the window containing this view gains or loses window focus. 7672 * ViewGroups should override to route to their children. 7673 * 7674 * @param hasFocus True if the window containing this view now has focus, 7675 * false otherwise. 7676 */ 7677 public void dispatchWindowFocusChanged(boolean hasFocus) { 7678 onWindowFocusChanged(hasFocus); 7679 } 7680 7681 /** 7682 * Called when the window containing this view gains or loses focus. Note 7683 * that this is separate from view focus: to receive key events, both 7684 * your view and its window must have focus. If a window is displayed 7685 * on top of yours that takes input focus, then your own window will lose 7686 * focus but the view focus will remain unchanged. 7687 * 7688 * @param hasWindowFocus True if the window containing this view now has 7689 * focus, false otherwise. 7690 */ 7691 public void onWindowFocusChanged(boolean hasWindowFocus) { 7692 InputMethodManager imm = InputMethodManager.peekInstance(); 7693 if (!hasWindowFocus) { 7694 if (isPressed()) { 7695 setPressed(false); 7696 } 7697 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7698 imm.focusOut(this); 7699 } 7700 removeLongPressCallback(); 7701 removeTapCallback(); 7702 onFocusLost(); 7703 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7704 imm.focusIn(this); 7705 } 7706 refreshDrawableState(); 7707 } 7708 7709 /** 7710 * Returns true if this view is in a window that currently has window focus. 7711 * Note that this is not the same as the view itself having focus. 7712 * 7713 * @return True if this view is in a window that currently has window focus. 7714 */ 7715 public boolean hasWindowFocus() { 7716 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7717 } 7718 7719 /** 7720 * Dispatch a view visibility change down the view hierarchy. 7721 * ViewGroups should override to route to their children. 7722 * @param changedView The view whose visibility changed. Could be 'this' or 7723 * an ancestor view. 7724 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7725 * {@link #INVISIBLE} or {@link #GONE}. 7726 */ 7727 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7728 onVisibilityChanged(changedView, visibility); 7729 } 7730 7731 /** 7732 * Called when the visibility of the view or an ancestor of the view is changed. 7733 * @param changedView The view whose visibility changed. Could be 'this' or 7734 * an ancestor view. 7735 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7736 * {@link #INVISIBLE} or {@link #GONE}. 7737 */ 7738 protected void onVisibilityChanged(View changedView, int visibility) { 7739 if (visibility == VISIBLE) { 7740 if (mAttachInfo != null) { 7741 initialAwakenScrollBars(); 7742 } else { 7743 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7744 } 7745 } 7746 } 7747 7748 /** 7749 * Dispatch a hint about whether this view is displayed. For instance, when 7750 * a View moves out of the screen, it might receives a display hint indicating 7751 * the view is not displayed. Applications should not <em>rely</em> on this hint 7752 * as there is no guarantee that they will receive one. 7753 * 7754 * @param hint A hint about whether or not this view is displayed: 7755 * {@link #VISIBLE} or {@link #INVISIBLE}. 7756 */ 7757 public void dispatchDisplayHint(int hint) { 7758 onDisplayHint(hint); 7759 } 7760 7761 /** 7762 * Gives this view a hint about whether is displayed or not. For instance, when 7763 * a View moves out of the screen, it might receives a display hint indicating 7764 * the view is not displayed. Applications should not <em>rely</em> on this hint 7765 * as there is no guarantee that they will receive one. 7766 * 7767 * @param hint A hint about whether or not this view is displayed: 7768 * {@link #VISIBLE} or {@link #INVISIBLE}. 7769 */ 7770 protected void onDisplayHint(int hint) { 7771 } 7772 7773 /** 7774 * Dispatch a window visibility change down the view hierarchy. 7775 * ViewGroups should override to route to their children. 7776 * 7777 * @param visibility The new visibility of the window. 7778 * 7779 * @see #onWindowVisibilityChanged(int) 7780 */ 7781 public void dispatchWindowVisibilityChanged(int visibility) { 7782 onWindowVisibilityChanged(visibility); 7783 } 7784 7785 /** 7786 * Called when the window containing has change its visibility 7787 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7788 * that this tells you whether or not your window is being made visible 7789 * to the window manager; this does <em>not</em> tell you whether or not 7790 * your window is obscured by other windows on the screen, even if it 7791 * is itself visible. 7792 * 7793 * @param visibility The new visibility of the window. 7794 */ 7795 protected void onWindowVisibilityChanged(int visibility) { 7796 if (visibility == VISIBLE) { 7797 initialAwakenScrollBars(); 7798 } 7799 } 7800 7801 /** 7802 * Returns the current visibility of the window this view is attached to 7803 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7804 * 7805 * @return Returns the current visibility of the view's window. 7806 */ 7807 public int getWindowVisibility() { 7808 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7809 } 7810 7811 /** 7812 * Retrieve the overall visible display size in which the window this view is 7813 * attached to has been positioned in. This takes into account screen 7814 * decorations above the window, for both cases where the window itself 7815 * is being position inside of them or the window is being placed under 7816 * then and covered insets are used for the window to position its content 7817 * inside. In effect, this tells you the available area where content can 7818 * be placed and remain visible to users. 7819 * 7820 * <p>This function requires an IPC back to the window manager to retrieve 7821 * the requested information, so should not be used in performance critical 7822 * code like drawing. 7823 * 7824 * @param outRect Filled in with the visible display frame. If the view 7825 * is not attached to a window, this is simply the raw display size. 7826 */ 7827 public void getWindowVisibleDisplayFrame(Rect outRect) { 7828 if (mAttachInfo != null) { 7829 try { 7830 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7831 } catch (RemoteException e) { 7832 return; 7833 } 7834 // XXX This is really broken, and probably all needs to be done 7835 // in the window manager, and we need to know more about whether 7836 // we want the area behind or in front of the IME. 7837 final Rect insets = mAttachInfo.mVisibleInsets; 7838 outRect.left += insets.left; 7839 outRect.top += insets.top; 7840 outRect.right -= insets.right; 7841 outRect.bottom -= insets.bottom; 7842 return; 7843 } 7844 // The view is not attached to a display so we don't have a context. 7845 // Make a best guess about the display size. 7846 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 7847 d.getRectSize(outRect); 7848 } 7849 7850 /** 7851 * Dispatch a notification about a resource configuration change down 7852 * the view hierarchy. 7853 * ViewGroups should override to route to their children. 7854 * 7855 * @param newConfig The new resource configuration. 7856 * 7857 * @see #onConfigurationChanged(android.content.res.Configuration) 7858 */ 7859 public void dispatchConfigurationChanged(Configuration newConfig) { 7860 onConfigurationChanged(newConfig); 7861 } 7862 7863 /** 7864 * Called when the current configuration of the resources being used 7865 * by the application have changed. You can use this to decide when 7866 * to reload resources that can changed based on orientation and other 7867 * configuration characterstics. You only need to use this if you are 7868 * not relying on the normal {@link android.app.Activity} mechanism of 7869 * recreating the activity instance upon a configuration change. 7870 * 7871 * @param newConfig The new resource configuration. 7872 */ 7873 protected void onConfigurationChanged(Configuration newConfig) { 7874 } 7875 7876 /** 7877 * Private function to aggregate all per-view attributes in to the view 7878 * root. 7879 */ 7880 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7881 performCollectViewAttributes(attachInfo, visibility); 7882 } 7883 7884 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7885 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7886 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7887 attachInfo.mKeepScreenOn = true; 7888 } 7889 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7890 ListenerInfo li = mListenerInfo; 7891 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7892 attachInfo.mHasSystemUiListeners = true; 7893 } 7894 } 7895 } 7896 7897 void needGlobalAttributesUpdate(boolean force) { 7898 final AttachInfo ai = mAttachInfo; 7899 if (ai != null && !ai.mRecomputeGlobalAttributes) { 7900 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7901 || ai.mHasSystemUiListeners) { 7902 ai.mRecomputeGlobalAttributes = true; 7903 } 7904 } 7905 } 7906 7907 /** 7908 * Returns whether the device is currently in touch mode. Touch mode is entered 7909 * once the user begins interacting with the device by touch, and affects various 7910 * things like whether focus is always visible to the user. 7911 * 7912 * @return Whether the device is in touch mode. 7913 */ 7914 @ViewDebug.ExportedProperty 7915 public boolean isInTouchMode() { 7916 if (mAttachInfo != null) { 7917 return mAttachInfo.mInTouchMode; 7918 } else { 7919 return ViewRootImpl.isInTouchMode(); 7920 } 7921 } 7922 7923 /** 7924 * Returns the context the view is running in, through which it can 7925 * access the current theme, resources, etc. 7926 * 7927 * @return The view's Context. 7928 */ 7929 @ViewDebug.CapturedViewProperty 7930 public final Context getContext() { 7931 return mContext; 7932 } 7933 7934 /** 7935 * Handle a key event before it is processed by any input method 7936 * associated with the view hierarchy. This can be used to intercept 7937 * key events in special situations before the IME consumes them; a 7938 * typical example would be handling the BACK key to update the application's 7939 * UI instead of allowing the IME to see it and close itself. 7940 * 7941 * @param keyCode The value in event.getKeyCode(). 7942 * @param event Description of the key event. 7943 * @return If you handled the event, return true. If you want to allow the 7944 * event to be handled by the next receiver, return false. 7945 */ 7946 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7947 return false; 7948 } 7949 7950 /** 7951 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7952 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7953 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7954 * is released, if the view is enabled and clickable. 7955 * 7956 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7957 * although some may elect to do so in some situations. Do not rely on this to 7958 * catch software key presses. 7959 * 7960 * @param keyCode A key code that represents the button pressed, from 7961 * {@link android.view.KeyEvent}. 7962 * @param event The KeyEvent object that defines the button action. 7963 */ 7964 public boolean onKeyDown(int keyCode, KeyEvent event) { 7965 boolean result = false; 7966 7967 if (KeyEvent.isConfirmKey(event.getKeyCode())) { 7968 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7969 return true; 7970 } 7971 // Long clickable items don't necessarily have to be clickable 7972 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7973 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7974 (event.getRepeatCount() == 0)) { 7975 setPressed(true); 7976 checkForLongClick(0); 7977 return true; 7978 } 7979 } 7980 return result; 7981 } 7982 7983 /** 7984 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7985 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7986 * the event). 7987 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7988 * although some may elect to do so in some situations. Do not rely on this to 7989 * catch software key presses. 7990 */ 7991 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7992 return false; 7993 } 7994 7995 /** 7996 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7997 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7998 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7999 * {@link KeyEvent#KEYCODE_ENTER} is released. 8000 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8001 * although some may elect to do so in some situations. Do not rely on this to 8002 * catch software key presses. 8003 * 8004 * @param keyCode A key code that represents the button pressed, from 8005 * {@link android.view.KeyEvent}. 8006 * @param event The KeyEvent object that defines the button action. 8007 */ 8008 public boolean onKeyUp(int keyCode, KeyEvent event) { 8009 boolean result = false; 8010 8011 switch (keyCode) { 8012 case KeyEvent.KEYCODE_DPAD_CENTER: 8013 case KeyEvent.KEYCODE_ENTER: { 8014 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 8015 return true; 8016 } 8017 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 8018 setPressed(false); 8019 8020 if (!mHasPerformedLongPress) { 8021 // This is a tap, so remove the longpress check 8022 removeLongPressCallback(); 8023 8024 result = performClick(); 8025 } 8026 } 8027 break; 8028 } 8029 } 8030 return result; 8031 } 8032 8033 /** 8034 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 8035 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 8036 * the event). 8037 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8038 * although some may elect to do so in some situations. Do not rely on this to 8039 * catch software key presses. 8040 * 8041 * @param keyCode A key code that represents the button pressed, from 8042 * {@link android.view.KeyEvent}. 8043 * @param repeatCount The number of times the action was made. 8044 * @param event The KeyEvent object that defines the button action. 8045 */ 8046 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 8047 return false; 8048 } 8049 8050 /** 8051 * Called on the focused view when a key shortcut event is not handled. 8052 * Override this method to implement local key shortcuts for the View. 8053 * Key shortcuts can also be implemented by setting the 8054 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 8055 * 8056 * @param keyCode The value in event.getKeyCode(). 8057 * @param event Description of the key event. 8058 * @return If you handled the event, return true. If you want to allow the 8059 * event to be handled by the next receiver, return false. 8060 */ 8061 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 8062 return false; 8063 } 8064 8065 /** 8066 * Check whether the called view is a text editor, in which case it 8067 * would make sense to automatically display a soft input window for 8068 * it. Subclasses should override this if they implement 8069 * {@link #onCreateInputConnection(EditorInfo)} to return true if 8070 * a call on that method would return a non-null InputConnection, and 8071 * they are really a first-class editor that the user would normally 8072 * start typing on when the go into a window containing your view. 8073 * 8074 * <p>The default implementation always returns false. This does 8075 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 8076 * will not be called or the user can not otherwise perform edits on your 8077 * view; it is just a hint to the system that this is not the primary 8078 * purpose of this view. 8079 * 8080 * @return Returns true if this view is a text editor, else false. 8081 */ 8082 public boolean onCheckIsTextEditor() { 8083 return false; 8084 } 8085 8086 /** 8087 * Create a new InputConnection for an InputMethod to interact 8088 * with the view. The default implementation returns null, since it doesn't 8089 * support input methods. You can override this to implement such support. 8090 * This is only needed for views that take focus and text input. 8091 * 8092 * <p>When implementing this, you probably also want to implement 8093 * {@link #onCheckIsTextEditor()} to indicate you will return a 8094 * non-null InputConnection. 8095 * 8096 * @param outAttrs Fill in with attribute information about the connection. 8097 */ 8098 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 8099 return null; 8100 } 8101 8102 /** 8103 * Called by the {@link android.view.inputmethod.InputMethodManager} 8104 * when a view who is not the current 8105 * input connection target is trying to make a call on the manager. The 8106 * default implementation returns false; you can override this to return 8107 * true for certain views if you are performing InputConnection proxying 8108 * to them. 8109 * @param view The View that is making the InputMethodManager call. 8110 * @return Return true to allow the call, false to reject. 8111 */ 8112 public boolean checkInputConnectionProxy(View view) { 8113 return false; 8114 } 8115 8116 /** 8117 * Show the context menu for this view. It is not safe to hold on to the 8118 * menu after returning from this method. 8119 * 8120 * You should normally not overload this method. Overload 8121 * {@link #onCreateContextMenu(ContextMenu)} or define an 8122 * {@link OnCreateContextMenuListener} to add items to the context menu. 8123 * 8124 * @param menu The context menu to populate 8125 */ 8126 public void createContextMenu(ContextMenu menu) { 8127 ContextMenuInfo menuInfo = getContextMenuInfo(); 8128 8129 // Sets the current menu info so all items added to menu will have 8130 // my extra info set. 8131 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 8132 8133 onCreateContextMenu(menu); 8134 ListenerInfo li = mListenerInfo; 8135 if (li != null && li.mOnCreateContextMenuListener != null) { 8136 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 8137 } 8138 8139 // Clear the extra information so subsequent items that aren't mine don't 8140 // have my extra info. 8141 ((MenuBuilder)menu).setCurrentMenuInfo(null); 8142 8143 if (mParent != null) { 8144 mParent.createContextMenu(menu); 8145 } 8146 } 8147 8148 /** 8149 * Views should implement this if they have extra information to associate 8150 * with the context menu. The return result is supplied as a parameter to 8151 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 8152 * callback. 8153 * 8154 * @return Extra information about the item for which the context menu 8155 * should be shown. This information will vary across different 8156 * subclasses of View. 8157 */ 8158 protected ContextMenuInfo getContextMenuInfo() { 8159 return null; 8160 } 8161 8162 /** 8163 * Views should implement this if the view itself is going to add items to 8164 * the context menu. 8165 * 8166 * @param menu the context menu to populate 8167 */ 8168 protected void onCreateContextMenu(ContextMenu menu) { 8169 } 8170 8171 /** 8172 * Implement this method to handle trackball motion events. The 8173 * <em>relative</em> movement of the trackball since the last event 8174 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 8175 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 8176 * that a movement of 1 corresponds to the user pressing one DPAD key (so 8177 * they will often be fractional values, representing the more fine-grained 8178 * movement information available from a trackball). 8179 * 8180 * @param event The motion event. 8181 * @return True if the event was handled, false otherwise. 8182 */ 8183 public boolean onTrackballEvent(MotionEvent event) { 8184 return false; 8185 } 8186 8187 /** 8188 * Implement this method to handle generic motion events. 8189 * <p> 8190 * Generic motion events describe joystick movements, mouse hovers, track pad 8191 * touches, scroll wheel movements and other input events. The 8192 * {@link MotionEvent#getSource() source} of the motion event specifies 8193 * the class of input that was received. Implementations of this method 8194 * must examine the bits in the source before processing the event. 8195 * The following code example shows how this is done. 8196 * </p><p> 8197 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8198 * are delivered to the view under the pointer. All other generic motion events are 8199 * delivered to the focused view. 8200 * </p> 8201 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 8202 * if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { 8203 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 8204 * // process the joystick movement... 8205 * return true; 8206 * } 8207 * } 8208 * if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { 8209 * switch (event.getAction()) { 8210 * case MotionEvent.ACTION_HOVER_MOVE: 8211 * // process the mouse hover movement... 8212 * return true; 8213 * case MotionEvent.ACTION_SCROLL: 8214 * // process the scroll wheel movement... 8215 * return true; 8216 * } 8217 * } 8218 * return super.onGenericMotionEvent(event); 8219 * }</pre> 8220 * 8221 * @param event The generic motion event being processed. 8222 * @return True if the event was handled, false otherwise. 8223 */ 8224 public boolean onGenericMotionEvent(MotionEvent event) { 8225 return false; 8226 } 8227 8228 /** 8229 * Implement this method to handle hover events. 8230 * <p> 8231 * This method is called whenever a pointer is hovering into, over, or out of the 8232 * bounds of a view and the view is not currently being touched. 8233 * Hover events are represented as pointer events with action 8234 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 8235 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 8236 * </p> 8237 * <ul> 8238 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 8239 * when the pointer enters the bounds of the view.</li> 8240 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 8241 * when the pointer has already entered the bounds of the view and has moved.</li> 8242 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 8243 * when the pointer has exited the bounds of the view or when the pointer is 8244 * about to go down due to a button click, tap, or similar user action that 8245 * causes the view to be touched.</li> 8246 * </ul> 8247 * <p> 8248 * The view should implement this method to return true to indicate that it is 8249 * handling the hover event, such as by changing its drawable state. 8250 * </p><p> 8251 * The default implementation calls {@link #setHovered} to update the hovered state 8252 * of the view when a hover enter or hover exit event is received, if the view 8253 * is enabled and is clickable. The default implementation also sends hover 8254 * accessibility events. 8255 * </p> 8256 * 8257 * @param event The motion event that describes the hover. 8258 * @return True if the view handled the hover event. 8259 * 8260 * @see #isHovered 8261 * @see #setHovered 8262 * @see #onHoverChanged 8263 */ 8264 public boolean onHoverEvent(MotionEvent event) { 8265 // The root view may receive hover (or touch) events that are outside the bounds of 8266 // the window. This code ensures that we only send accessibility events for 8267 // hovers that are actually within the bounds of the root view. 8268 final int action = event.getActionMasked(); 8269 if (!mSendingHoverAccessibilityEvents) { 8270 if ((action == MotionEvent.ACTION_HOVER_ENTER 8271 || action == MotionEvent.ACTION_HOVER_MOVE) 8272 && !hasHoveredChild() 8273 && pointInView(event.getX(), event.getY())) { 8274 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8275 mSendingHoverAccessibilityEvents = true; 8276 } 8277 } else { 8278 if (action == MotionEvent.ACTION_HOVER_EXIT 8279 || (action == MotionEvent.ACTION_MOVE 8280 && !pointInView(event.getX(), event.getY()))) { 8281 mSendingHoverAccessibilityEvents = false; 8282 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8283 // If the window does not have input focus we take away accessibility 8284 // focus as soon as the user stop hovering over the view. 8285 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8286 getViewRootImpl().setAccessibilityFocus(null, null); 8287 } 8288 } 8289 } 8290 8291 if (isHoverable()) { 8292 switch (action) { 8293 case MotionEvent.ACTION_HOVER_ENTER: 8294 setHovered(true); 8295 break; 8296 case MotionEvent.ACTION_HOVER_EXIT: 8297 setHovered(false); 8298 break; 8299 } 8300 8301 // Dispatch the event to onGenericMotionEvent before returning true. 8302 // This is to provide compatibility with existing applications that 8303 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8304 // break because of the new default handling for hoverable views 8305 // in onHoverEvent. 8306 // Note that onGenericMotionEvent will be called by default when 8307 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8308 dispatchGenericMotionEventInternal(event); 8309 // The event was already handled by calling setHovered(), so always 8310 // return true. 8311 return true; 8312 } 8313 8314 return false; 8315 } 8316 8317 /** 8318 * Returns true if the view should handle {@link #onHoverEvent} 8319 * by calling {@link #setHovered} to change its hovered state. 8320 * 8321 * @return True if the view is hoverable. 8322 */ 8323 private boolean isHoverable() { 8324 final int viewFlags = mViewFlags; 8325 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8326 return false; 8327 } 8328 8329 return (viewFlags & CLICKABLE) == CLICKABLE 8330 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8331 } 8332 8333 /** 8334 * Returns true if the view is currently hovered. 8335 * 8336 * @return True if the view is currently hovered. 8337 * 8338 * @see #setHovered 8339 * @see #onHoverChanged 8340 */ 8341 @ViewDebug.ExportedProperty 8342 public boolean isHovered() { 8343 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8344 } 8345 8346 /** 8347 * Sets whether the view is currently hovered. 8348 * <p> 8349 * Calling this method also changes the drawable state of the view. This 8350 * enables the view to react to hover by using different drawable resources 8351 * to change its appearance. 8352 * </p><p> 8353 * The {@link #onHoverChanged} method is called when the hovered state changes. 8354 * </p> 8355 * 8356 * @param hovered True if the view is hovered. 8357 * 8358 * @see #isHovered 8359 * @see #onHoverChanged 8360 */ 8361 public void setHovered(boolean hovered) { 8362 if (hovered) { 8363 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8364 mPrivateFlags |= PFLAG_HOVERED; 8365 refreshDrawableState(); 8366 onHoverChanged(true); 8367 } 8368 } else { 8369 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8370 mPrivateFlags &= ~PFLAG_HOVERED; 8371 refreshDrawableState(); 8372 onHoverChanged(false); 8373 } 8374 } 8375 } 8376 8377 /** 8378 * Implement this method to handle hover state changes. 8379 * <p> 8380 * This method is called whenever the hover state changes as a result of a 8381 * call to {@link #setHovered}. 8382 * </p> 8383 * 8384 * @param hovered The current hover state, as returned by {@link #isHovered}. 8385 * 8386 * @see #isHovered 8387 * @see #setHovered 8388 */ 8389 public void onHoverChanged(boolean hovered) { 8390 } 8391 8392 /** 8393 * Implement this method to handle touch screen motion events. 8394 * 8395 * @param event The motion event. 8396 * @return True if the event was handled, false otherwise. 8397 */ 8398 public boolean onTouchEvent(MotionEvent event) { 8399 final int viewFlags = mViewFlags; 8400 8401 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8402 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8403 setPressed(false); 8404 } 8405 // A disabled view that is clickable still consumes the touch 8406 // events, it just doesn't respond to them. 8407 return (((viewFlags & CLICKABLE) == CLICKABLE || 8408 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8409 } 8410 8411 if (mTouchDelegate != null) { 8412 if (mTouchDelegate.onTouchEvent(event)) { 8413 return true; 8414 } 8415 } 8416 8417 if (((viewFlags & CLICKABLE) == CLICKABLE || 8418 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8419 switch (event.getAction()) { 8420 case MotionEvent.ACTION_UP: 8421 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8422 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8423 // take focus if we don't have it already and we should in 8424 // touch mode. 8425 boolean focusTaken = false; 8426 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8427 focusTaken = requestFocus(); 8428 } 8429 8430 if (prepressed) { 8431 // The button is being released before we actually 8432 // showed it as pressed. Make it show the pressed 8433 // state now (before scheduling the click) to ensure 8434 // the user sees it. 8435 setPressed(true); 8436 } 8437 8438 if (!mHasPerformedLongPress) { 8439 // This is a tap, so remove the longpress check 8440 removeLongPressCallback(); 8441 8442 // Only perform take click actions if we were in the pressed state 8443 if (!focusTaken) { 8444 // Use a Runnable and post this rather than calling 8445 // performClick directly. This lets other visual state 8446 // of the view update before click actions start. 8447 if (mPerformClick == null) { 8448 mPerformClick = new PerformClick(); 8449 } 8450 if (!post(mPerformClick)) { 8451 performClick(); 8452 } 8453 } 8454 } 8455 8456 if (mUnsetPressedState == null) { 8457 mUnsetPressedState = new UnsetPressedState(); 8458 } 8459 8460 if (prepressed) { 8461 postDelayed(mUnsetPressedState, 8462 ViewConfiguration.getPressedStateDuration()); 8463 } else if (!post(mUnsetPressedState)) { 8464 // If the post failed, unpress right now 8465 mUnsetPressedState.run(); 8466 } 8467 removeTapCallback(); 8468 } 8469 break; 8470 8471 case MotionEvent.ACTION_DOWN: 8472 mHasPerformedLongPress = false; 8473 8474 if (performButtonActionOnTouchDown(event)) { 8475 break; 8476 } 8477 8478 // Walk up the hierarchy to determine if we're inside a scrolling container. 8479 boolean isInScrollingContainer = isInScrollingContainer(); 8480 8481 // For views inside a scrolling container, delay the pressed feedback for 8482 // a short period in case this is a scroll. 8483 if (isInScrollingContainer) { 8484 mPrivateFlags |= PFLAG_PREPRESSED; 8485 if (mPendingCheckForTap == null) { 8486 mPendingCheckForTap = new CheckForTap(); 8487 } 8488 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8489 } else { 8490 // Not inside a scrolling container, so show the feedback right away 8491 setPressed(true); 8492 checkForLongClick(0); 8493 } 8494 break; 8495 8496 case MotionEvent.ACTION_CANCEL: 8497 setPressed(false); 8498 removeTapCallback(); 8499 removeLongPressCallback(); 8500 break; 8501 8502 case MotionEvent.ACTION_MOVE: 8503 final int x = (int) event.getX(); 8504 final int y = (int) event.getY(); 8505 8506 // Be lenient about moving outside of buttons 8507 if (!pointInView(x, y, mTouchSlop)) { 8508 // Outside button 8509 removeTapCallback(); 8510 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8511 // Remove any future long press/tap checks 8512 removeLongPressCallback(); 8513 8514 setPressed(false); 8515 } 8516 } 8517 break; 8518 } 8519 return true; 8520 } 8521 8522 return false; 8523 } 8524 8525 /** 8526 * @hide 8527 */ 8528 public boolean isInScrollingContainer() { 8529 ViewParent p = getParent(); 8530 while (p != null && p instanceof ViewGroup) { 8531 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8532 return true; 8533 } 8534 p = p.getParent(); 8535 } 8536 return false; 8537 } 8538 8539 /** 8540 * Remove the longpress detection timer. 8541 */ 8542 private void removeLongPressCallback() { 8543 if (mPendingCheckForLongPress != null) { 8544 removeCallbacks(mPendingCheckForLongPress); 8545 } 8546 } 8547 8548 /** 8549 * Remove the pending click action 8550 */ 8551 private void removePerformClickCallback() { 8552 if (mPerformClick != null) { 8553 removeCallbacks(mPerformClick); 8554 } 8555 } 8556 8557 /** 8558 * Remove the prepress detection timer. 8559 */ 8560 private void removeUnsetPressCallback() { 8561 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8562 setPressed(false); 8563 removeCallbacks(mUnsetPressedState); 8564 } 8565 } 8566 8567 /** 8568 * Remove the tap detection timer. 8569 */ 8570 private void removeTapCallback() { 8571 if (mPendingCheckForTap != null) { 8572 mPrivateFlags &= ~PFLAG_PREPRESSED; 8573 removeCallbacks(mPendingCheckForTap); 8574 } 8575 } 8576 8577 /** 8578 * Cancels a pending long press. Your subclass can use this if you 8579 * want the context menu to come up if the user presses and holds 8580 * at the same place, but you don't want it to come up if they press 8581 * and then move around enough to cause scrolling. 8582 */ 8583 public void cancelLongPress() { 8584 removeLongPressCallback(); 8585 8586 /* 8587 * The prepressed state handled by the tap callback is a display 8588 * construct, but the tap callback will post a long press callback 8589 * less its own timeout. Remove it here. 8590 */ 8591 removeTapCallback(); 8592 } 8593 8594 /** 8595 * Remove the pending callback for sending a 8596 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8597 */ 8598 private void removeSendViewScrolledAccessibilityEventCallback() { 8599 if (mSendViewScrolledAccessibilityEvent != null) { 8600 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8601 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8602 } 8603 } 8604 8605 /** 8606 * Sets the TouchDelegate for this View. 8607 */ 8608 public void setTouchDelegate(TouchDelegate delegate) { 8609 mTouchDelegate = delegate; 8610 } 8611 8612 /** 8613 * Gets the TouchDelegate for this View. 8614 */ 8615 public TouchDelegate getTouchDelegate() { 8616 return mTouchDelegate; 8617 } 8618 8619 /** 8620 * Set flags controlling behavior of this view. 8621 * 8622 * @param flags Constant indicating the value which should be set 8623 * @param mask Constant indicating the bit range that should be changed 8624 */ 8625 void setFlags(int flags, int mask) { 8626 final boolean accessibilityEnabled = 8627 AccessibilityManager.getInstance(mContext).isEnabled(); 8628 final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility(); 8629 8630 int old = mViewFlags; 8631 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8632 8633 int changed = mViewFlags ^ old; 8634 if (changed == 0) { 8635 return; 8636 } 8637 int privateFlags = mPrivateFlags; 8638 8639 /* Check if the FOCUSABLE bit has changed */ 8640 if (((changed & FOCUSABLE_MASK) != 0) && 8641 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8642 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8643 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8644 /* Give up focus if we are no longer focusable */ 8645 clearFocus(); 8646 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8647 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8648 /* 8649 * Tell the view system that we are now available to take focus 8650 * if no one else already has it. 8651 */ 8652 if (mParent != null) mParent.focusableViewAvailable(this); 8653 } 8654 } 8655 8656 final int newVisibility = flags & VISIBILITY_MASK; 8657 if (newVisibility == VISIBLE) { 8658 if ((changed & VISIBILITY_MASK) != 0) { 8659 /* 8660 * If this view is becoming visible, invalidate it in case it changed while 8661 * it was not visible. Marking it drawn ensures that the invalidation will 8662 * go through. 8663 */ 8664 mPrivateFlags |= PFLAG_DRAWN; 8665 invalidate(true); 8666 8667 needGlobalAttributesUpdate(true); 8668 8669 // a view becoming visible is worth notifying the parent 8670 // about in case nothing has focus. even if this specific view 8671 // isn't focusable, it may contain something that is, so let 8672 // the root view try to give this focus if nothing else does. 8673 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8674 mParent.focusableViewAvailable(this); 8675 } 8676 } 8677 } 8678 8679 /* Check if the GONE bit has changed */ 8680 if ((changed & GONE) != 0) { 8681 needGlobalAttributesUpdate(false); 8682 requestLayout(); 8683 8684 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8685 if (hasFocus()) clearFocus(); 8686 clearAccessibilityFocus(); 8687 destroyDrawingCache(); 8688 if (mParent instanceof View) { 8689 // GONE views noop invalidation, so invalidate the parent 8690 ((View) mParent).invalidate(true); 8691 } 8692 // Mark the view drawn to ensure that it gets invalidated properly the next 8693 // time it is visible and gets invalidated 8694 mPrivateFlags |= PFLAG_DRAWN; 8695 } 8696 if (mAttachInfo != null) { 8697 mAttachInfo.mViewVisibilityChanged = true; 8698 } 8699 } 8700 8701 /* Check if the VISIBLE bit has changed */ 8702 if ((changed & INVISIBLE) != 0) { 8703 needGlobalAttributesUpdate(false); 8704 /* 8705 * If this view is becoming invisible, set the DRAWN flag so that 8706 * the next invalidate() will not be skipped. 8707 */ 8708 mPrivateFlags |= PFLAG_DRAWN; 8709 8710 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8711 // root view becoming invisible shouldn't clear focus and accessibility focus 8712 if (getRootView() != this) { 8713 clearFocus(); 8714 clearAccessibilityFocus(); 8715 } 8716 } 8717 if (mAttachInfo != null) { 8718 mAttachInfo.mViewVisibilityChanged = true; 8719 } 8720 } 8721 8722 if ((changed & VISIBILITY_MASK) != 0) { 8723 // If the view is invisible, cleanup its display list to free up resources 8724 if (newVisibility != VISIBLE) { 8725 cleanupDraw(); 8726 } 8727 8728 if (mParent instanceof ViewGroup) { 8729 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8730 (changed & VISIBILITY_MASK), newVisibility); 8731 ((View) mParent).invalidate(true); 8732 } else if (mParent != null) { 8733 mParent.invalidateChild(this, null); 8734 } 8735 dispatchVisibilityChanged(this, newVisibility); 8736 } 8737 8738 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8739 destroyDrawingCache(); 8740 } 8741 8742 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8743 destroyDrawingCache(); 8744 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8745 invalidateParentCaches(); 8746 } 8747 8748 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8749 destroyDrawingCache(); 8750 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8751 } 8752 8753 if ((changed & DRAW_MASK) != 0) { 8754 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8755 if (mBackground != null) { 8756 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8757 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8758 } else { 8759 mPrivateFlags |= PFLAG_SKIP_DRAW; 8760 } 8761 } else { 8762 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8763 } 8764 requestLayout(); 8765 invalidate(true); 8766 } 8767 8768 if ((changed & KEEP_SCREEN_ON) != 0) { 8769 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8770 mParent.recomputeViewAttributes(this); 8771 } 8772 } 8773 8774 if (accessibilityEnabled) { 8775 if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0 8776 || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0) { 8777 if (oldIncludeForAccessibility != includeForAccessibility()) { 8778 notifySubtreeAccessibilityStateChangedIfNeeded(); 8779 } else { 8780 notifyViewAccessibilityStateChangedIfNeeded(); 8781 } 8782 } 8783 if ((changed & ENABLED_MASK) != 0) { 8784 notifyViewAccessibilityStateChangedIfNeeded(); 8785 } 8786 } 8787 } 8788 8789 /** 8790 * Change the view's z order in the tree, so it's on top of other sibling 8791 * views. This ordering change may affect layout, if the parent container 8792 * uses an order-dependent layout scheme (e.g., LinearLayout). This 8793 * method should be followed by calls to {@link #requestLayout()} and 8794 * {@link View#invalidate()} on the parent. 8795 * 8796 * @see ViewGroup#bringChildToFront(View) 8797 */ 8798 public void bringToFront() { 8799 if (mParent != null) { 8800 mParent.bringChildToFront(this); 8801 } 8802 } 8803 8804 /** 8805 * This is called in response to an internal scroll in this view (i.e., the 8806 * view scrolled its own contents). This is typically as a result of 8807 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8808 * called. 8809 * 8810 * @param l Current horizontal scroll origin. 8811 * @param t Current vertical scroll origin. 8812 * @param oldl Previous horizontal scroll origin. 8813 * @param oldt Previous vertical scroll origin. 8814 */ 8815 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8816 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8817 postSendViewScrolledAccessibilityEventCallback(); 8818 } 8819 8820 mBackgroundSizeChanged = true; 8821 8822 final AttachInfo ai = mAttachInfo; 8823 if (ai != null) { 8824 ai.mViewScrollChanged = true; 8825 } 8826 } 8827 8828 /** 8829 * Interface definition for a callback to be invoked when the layout bounds of a view 8830 * changes due to layout processing. 8831 */ 8832 public interface OnLayoutChangeListener { 8833 /** 8834 * Called when the focus state of a view has changed. 8835 * 8836 * @param v The view whose state has changed. 8837 * @param left The new value of the view's left property. 8838 * @param top The new value of the view's top property. 8839 * @param right The new value of the view's right property. 8840 * @param bottom The new value of the view's bottom property. 8841 * @param oldLeft The previous value of the view's left property. 8842 * @param oldTop The previous value of the view's top property. 8843 * @param oldRight The previous value of the view's right property. 8844 * @param oldBottom The previous value of the view's bottom property. 8845 */ 8846 void onLayoutChange(View v, int left, int top, int right, int bottom, 8847 int oldLeft, int oldTop, int oldRight, int oldBottom); 8848 } 8849 8850 /** 8851 * This is called during layout when the size of this view has changed. If 8852 * you were just added to the view hierarchy, you're called with the old 8853 * values of 0. 8854 * 8855 * @param w Current width of this view. 8856 * @param h Current height of this view. 8857 * @param oldw Old width of this view. 8858 * @param oldh Old height of this view. 8859 */ 8860 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8861 } 8862 8863 /** 8864 * Called by draw to draw the child views. This may be overridden 8865 * by derived classes to gain control just before its children are drawn 8866 * (but after its own view has been drawn). 8867 * @param canvas the canvas on which to draw the view 8868 */ 8869 protected void dispatchDraw(Canvas canvas) { 8870 8871 } 8872 8873 /** 8874 * Gets the parent of this view. Note that the parent is a 8875 * ViewParent and not necessarily a View. 8876 * 8877 * @return Parent of this view. 8878 */ 8879 public final ViewParent getParent() { 8880 return mParent; 8881 } 8882 8883 /** 8884 * Set the horizontal scrolled position of your view. This will cause a call to 8885 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8886 * invalidated. 8887 * @param value the x position to scroll to 8888 */ 8889 public void setScrollX(int value) { 8890 scrollTo(value, mScrollY); 8891 } 8892 8893 /** 8894 * Set the vertical scrolled position of your view. This will cause a call to 8895 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8896 * invalidated. 8897 * @param value the y position to scroll to 8898 */ 8899 public void setScrollY(int value) { 8900 scrollTo(mScrollX, value); 8901 } 8902 8903 /** 8904 * Return the scrolled left position of this view. This is the left edge of 8905 * the displayed part of your view. You do not need to draw any pixels 8906 * farther left, since those are outside of the frame of your view on 8907 * screen. 8908 * 8909 * @return The left edge of the displayed part of your view, in pixels. 8910 */ 8911 public final int getScrollX() { 8912 return mScrollX; 8913 } 8914 8915 /** 8916 * Return the scrolled top position of this view. This is the top edge of 8917 * the displayed part of your view. You do not need to draw any pixels above 8918 * it, since those are outside of the frame of your view on screen. 8919 * 8920 * @return The top edge of the displayed part of your view, in pixels. 8921 */ 8922 public final int getScrollY() { 8923 return mScrollY; 8924 } 8925 8926 /** 8927 * Return the width of the your view. 8928 * 8929 * @return The width of your view, in pixels. 8930 */ 8931 @ViewDebug.ExportedProperty(category = "layout") 8932 public final int getWidth() { 8933 return mRight - mLeft; 8934 } 8935 8936 /** 8937 * Return the height of your view. 8938 * 8939 * @return The height of your view, in pixels. 8940 */ 8941 @ViewDebug.ExportedProperty(category = "layout") 8942 public final int getHeight() { 8943 return mBottom - mTop; 8944 } 8945 8946 /** 8947 * Return the visible drawing bounds of your view. Fills in the output 8948 * rectangle with the values from getScrollX(), getScrollY(), 8949 * getWidth(), and getHeight(). These bounds do not account for any 8950 * transformation properties currently set on the view, such as 8951 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 8952 * 8953 * @param outRect The (scrolled) drawing bounds of the view. 8954 */ 8955 public void getDrawingRect(Rect outRect) { 8956 outRect.left = mScrollX; 8957 outRect.top = mScrollY; 8958 outRect.right = mScrollX + (mRight - mLeft); 8959 outRect.bottom = mScrollY + (mBottom - mTop); 8960 } 8961 8962 /** 8963 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8964 * raw width component (that is the result is masked by 8965 * {@link #MEASURED_SIZE_MASK}). 8966 * 8967 * @return The raw measured width of this view. 8968 */ 8969 public final int getMeasuredWidth() { 8970 return mMeasuredWidth & MEASURED_SIZE_MASK; 8971 } 8972 8973 /** 8974 * Return the full width measurement information for this view as computed 8975 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8976 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8977 * This should be used during measurement and layout calculations only. Use 8978 * {@link #getWidth()} to see how wide a view is after layout. 8979 * 8980 * @return The measured width of this view as a bit mask. 8981 */ 8982 public final int getMeasuredWidthAndState() { 8983 return mMeasuredWidth; 8984 } 8985 8986 /** 8987 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8988 * raw width component (that is the result is masked by 8989 * {@link #MEASURED_SIZE_MASK}). 8990 * 8991 * @return The raw measured height of this view. 8992 */ 8993 public final int getMeasuredHeight() { 8994 return mMeasuredHeight & MEASURED_SIZE_MASK; 8995 } 8996 8997 /** 8998 * Return the full height measurement information for this view as computed 8999 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 9000 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 9001 * This should be used during measurement and layout calculations only. Use 9002 * {@link #getHeight()} to see how wide a view is after layout. 9003 * 9004 * @return The measured width of this view as a bit mask. 9005 */ 9006 public final int getMeasuredHeightAndState() { 9007 return mMeasuredHeight; 9008 } 9009 9010 /** 9011 * Return only the state bits of {@link #getMeasuredWidthAndState()} 9012 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 9013 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 9014 * and the height component is at the shifted bits 9015 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 9016 */ 9017 public final int getMeasuredState() { 9018 return (mMeasuredWidth&MEASURED_STATE_MASK) 9019 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 9020 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 9021 } 9022 9023 /** 9024 * The transform matrix of this view, which is calculated based on the current 9025 * roation, scale, and pivot properties. 9026 * 9027 * @see #getRotation() 9028 * @see #getScaleX() 9029 * @see #getScaleY() 9030 * @see #getPivotX() 9031 * @see #getPivotY() 9032 * @return The current transform matrix for the view 9033 */ 9034 public Matrix getMatrix() { 9035 if (mTransformationInfo != null) { 9036 updateMatrix(); 9037 return mTransformationInfo.mMatrix; 9038 } 9039 return Matrix.IDENTITY_MATRIX; 9040 } 9041 9042 /** 9043 * Utility function to determine if the value is far enough away from zero to be 9044 * considered non-zero. 9045 * @param value A floating point value to check for zero-ness 9046 * @return whether the passed-in value is far enough away from zero to be considered non-zero 9047 */ 9048 private static boolean nonzero(float value) { 9049 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 9050 } 9051 9052 /** 9053 * Returns true if the transform matrix is the identity matrix. 9054 * Recomputes the matrix if necessary. 9055 * 9056 * @return True if the transform matrix is the identity matrix, false otherwise. 9057 */ 9058 final boolean hasIdentityMatrix() { 9059 if (mTransformationInfo != null) { 9060 updateMatrix(); 9061 return mTransformationInfo.mMatrixIsIdentity; 9062 } 9063 return true; 9064 } 9065 9066 void ensureTransformationInfo() { 9067 if (mTransformationInfo == null) { 9068 mTransformationInfo = new TransformationInfo(); 9069 } 9070 } 9071 9072 /** 9073 * Recomputes the transform matrix if necessary. 9074 */ 9075 private void updateMatrix() { 9076 final TransformationInfo info = mTransformationInfo; 9077 if (info == null) { 9078 return; 9079 } 9080 if (info.mMatrixDirty) { 9081 // transform-related properties have changed since the last time someone 9082 // asked for the matrix; recalculate it with the current values 9083 9084 // Figure out if we need to update the pivot point 9085 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9086 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 9087 info.mPrevWidth = mRight - mLeft; 9088 info.mPrevHeight = mBottom - mTop; 9089 info.mPivotX = info.mPrevWidth / 2f; 9090 info.mPivotY = info.mPrevHeight / 2f; 9091 } 9092 } 9093 info.mMatrix.reset(); 9094 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 9095 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 9096 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 9097 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9098 } else { 9099 if (info.mCamera == null) { 9100 info.mCamera = new Camera(); 9101 info.matrix3D = new Matrix(); 9102 } 9103 info.mCamera.save(); 9104 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9105 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 9106 info.mCamera.getMatrix(info.matrix3D); 9107 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 9108 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 9109 info.mPivotY + info.mTranslationY); 9110 info.mMatrix.postConcat(info.matrix3D); 9111 info.mCamera.restore(); 9112 } 9113 info.mMatrixDirty = false; 9114 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 9115 info.mInverseMatrixDirty = true; 9116 } 9117 } 9118 9119 /** 9120 * Utility method to retrieve the inverse of the current mMatrix property. 9121 * We cache the matrix to avoid recalculating it when transform properties 9122 * have not changed. 9123 * 9124 * @return The inverse of the current matrix of this view. 9125 */ 9126 final Matrix getInverseMatrix() { 9127 final TransformationInfo info = mTransformationInfo; 9128 if (info != null) { 9129 updateMatrix(); 9130 if (info.mInverseMatrixDirty) { 9131 if (info.mInverseMatrix == null) { 9132 info.mInverseMatrix = new Matrix(); 9133 } 9134 info.mMatrix.invert(info.mInverseMatrix); 9135 info.mInverseMatrixDirty = false; 9136 } 9137 return info.mInverseMatrix; 9138 } 9139 return Matrix.IDENTITY_MATRIX; 9140 } 9141 9142 /** 9143 * Gets the distance along the Z axis from the camera to this view. 9144 * 9145 * @see #setCameraDistance(float) 9146 * 9147 * @return The distance along the Z axis. 9148 */ 9149 public float getCameraDistance() { 9150 ensureTransformationInfo(); 9151 final float dpi = mResources.getDisplayMetrics().densityDpi; 9152 final TransformationInfo info = mTransformationInfo; 9153 if (info.mCamera == null) { 9154 info.mCamera = new Camera(); 9155 info.matrix3D = new Matrix(); 9156 } 9157 return -(info.mCamera.getLocationZ() * dpi); 9158 } 9159 9160 /** 9161 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 9162 * views are drawn) from the camera to this view. The camera's distance 9163 * affects 3D transformations, for instance rotations around the X and Y 9164 * axis. If the rotationX or rotationY properties are changed and this view is 9165 * large (more than half the size of the screen), it is recommended to always 9166 * use a camera distance that's greater than the height (X axis rotation) or 9167 * the width (Y axis rotation) of this view.</p> 9168 * 9169 * <p>The distance of the camera from the view plane can have an affect on the 9170 * perspective distortion of the view when it is rotated around the x or y axis. 9171 * For example, a large distance will result in a large viewing angle, and there 9172 * will not be much perspective distortion of the view as it rotates. A short 9173 * distance may cause much more perspective distortion upon rotation, and can 9174 * also result in some drawing artifacts if the rotated view ends up partially 9175 * behind the camera (which is why the recommendation is to use a distance at 9176 * least as far as the size of the view, if the view is to be rotated.)</p> 9177 * 9178 * <p>The distance is expressed in "depth pixels." The default distance depends 9179 * on the screen density. For instance, on a medium density display, the 9180 * default distance is 1280. On a high density display, the default distance 9181 * is 1920.</p> 9182 * 9183 * <p>If you want to specify a distance that leads to visually consistent 9184 * results across various densities, use the following formula:</p> 9185 * <pre> 9186 * float scale = context.getResources().getDisplayMetrics().density; 9187 * view.setCameraDistance(distance * scale); 9188 * </pre> 9189 * 9190 * <p>The density scale factor of a high density display is 1.5, 9191 * and 1920 = 1280 * 1.5.</p> 9192 * 9193 * @param distance The distance in "depth pixels", if negative the opposite 9194 * value is used 9195 * 9196 * @see #setRotationX(float) 9197 * @see #setRotationY(float) 9198 */ 9199 public void setCameraDistance(float distance) { 9200 invalidateViewProperty(true, false); 9201 9202 ensureTransformationInfo(); 9203 final float dpi = mResources.getDisplayMetrics().densityDpi; 9204 final TransformationInfo info = mTransformationInfo; 9205 if (info.mCamera == null) { 9206 info.mCamera = new Camera(); 9207 info.matrix3D = new Matrix(); 9208 } 9209 9210 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 9211 info.mMatrixDirty = true; 9212 9213 invalidateViewProperty(false, false); 9214 if (mDisplayList != null) { 9215 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 9216 } 9217 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9218 // View was rejected last time it was drawn by its parent; this may have changed 9219 invalidateParentIfNeeded(); 9220 } 9221 } 9222 9223 /** 9224 * The degrees that the view is rotated around the pivot point. 9225 * 9226 * @see #setRotation(float) 9227 * @see #getPivotX() 9228 * @see #getPivotY() 9229 * 9230 * @return The degrees of rotation. 9231 */ 9232 @ViewDebug.ExportedProperty(category = "drawing") 9233 public float getRotation() { 9234 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 9235 } 9236 9237 /** 9238 * Sets the degrees that the view is rotated around the pivot point. Increasing values 9239 * result in clockwise rotation. 9240 * 9241 * @param rotation The degrees of rotation. 9242 * 9243 * @see #getRotation() 9244 * @see #getPivotX() 9245 * @see #getPivotY() 9246 * @see #setRotationX(float) 9247 * @see #setRotationY(float) 9248 * 9249 * @attr ref android.R.styleable#View_rotation 9250 */ 9251 public void setRotation(float rotation) { 9252 ensureTransformationInfo(); 9253 final TransformationInfo info = mTransformationInfo; 9254 if (info.mRotation != rotation) { 9255 // Double-invalidation is necessary to capture view's old and new areas 9256 invalidateViewProperty(true, false); 9257 info.mRotation = rotation; 9258 info.mMatrixDirty = true; 9259 invalidateViewProperty(false, true); 9260 if (mDisplayList != null) { 9261 mDisplayList.setRotation(rotation); 9262 } 9263 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9264 // View was rejected last time it was drawn by its parent; this may have changed 9265 invalidateParentIfNeeded(); 9266 } 9267 } 9268 } 9269 9270 /** 9271 * The degrees that the view is rotated around the vertical axis through the pivot point. 9272 * 9273 * @see #getPivotX() 9274 * @see #getPivotY() 9275 * @see #setRotationY(float) 9276 * 9277 * @return The degrees of Y rotation. 9278 */ 9279 @ViewDebug.ExportedProperty(category = "drawing") 9280 public float getRotationY() { 9281 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 9282 } 9283 9284 /** 9285 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9286 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9287 * down the y axis. 9288 * 9289 * When rotating large views, it is recommended to adjust the camera distance 9290 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9291 * 9292 * @param rotationY The degrees of Y rotation. 9293 * 9294 * @see #getRotationY() 9295 * @see #getPivotX() 9296 * @see #getPivotY() 9297 * @see #setRotation(float) 9298 * @see #setRotationX(float) 9299 * @see #setCameraDistance(float) 9300 * 9301 * @attr ref android.R.styleable#View_rotationY 9302 */ 9303 public void setRotationY(float rotationY) { 9304 ensureTransformationInfo(); 9305 final TransformationInfo info = mTransformationInfo; 9306 if (info.mRotationY != rotationY) { 9307 invalidateViewProperty(true, false); 9308 info.mRotationY = rotationY; 9309 info.mMatrixDirty = true; 9310 invalidateViewProperty(false, true); 9311 if (mDisplayList != null) { 9312 mDisplayList.setRotationY(rotationY); 9313 } 9314 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9315 // View was rejected last time it was drawn by its parent; this may have changed 9316 invalidateParentIfNeeded(); 9317 } 9318 } 9319 } 9320 9321 /** 9322 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9323 * 9324 * @see #getPivotX() 9325 * @see #getPivotY() 9326 * @see #setRotationX(float) 9327 * 9328 * @return The degrees of X rotation. 9329 */ 9330 @ViewDebug.ExportedProperty(category = "drawing") 9331 public float getRotationX() { 9332 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9333 } 9334 9335 /** 9336 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9337 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9338 * x axis. 9339 * 9340 * When rotating large views, it is recommended to adjust the camera distance 9341 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9342 * 9343 * @param rotationX The degrees of X rotation. 9344 * 9345 * @see #getRotationX() 9346 * @see #getPivotX() 9347 * @see #getPivotY() 9348 * @see #setRotation(float) 9349 * @see #setRotationY(float) 9350 * @see #setCameraDistance(float) 9351 * 9352 * @attr ref android.R.styleable#View_rotationX 9353 */ 9354 public void setRotationX(float rotationX) { 9355 ensureTransformationInfo(); 9356 final TransformationInfo info = mTransformationInfo; 9357 if (info.mRotationX != rotationX) { 9358 invalidateViewProperty(true, false); 9359 info.mRotationX = rotationX; 9360 info.mMatrixDirty = true; 9361 invalidateViewProperty(false, true); 9362 if (mDisplayList != null) { 9363 mDisplayList.setRotationX(rotationX); 9364 } 9365 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9366 // View was rejected last time it was drawn by its parent; this may have changed 9367 invalidateParentIfNeeded(); 9368 } 9369 } 9370 } 9371 9372 /** 9373 * The amount that the view is scaled in x around the pivot point, as a proportion of 9374 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9375 * 9376 * <p>By default, this is 1.0f. 9377 * 9378 * @see #getPivotX() 9379 * @see #getPivotY() 9380 * @return The scaling factor. 9381 */ 9382 @ViewDebug.ExportedProperty(category = "drawing") 9383 public float getScaleX() { 9384 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9385 } 9386 9387 /** 9388 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9389 * the view's unscaled width. A value of 1 means that no scaling is applied. 9390 * 9391 * @param scaleX The scaling factor. 9392 * @see #getPivotX() 9393 * @see #getPivotY() 9394 * 9395 * @attr ref android.R.styleable#View_scaleX 9396 */ 9397 public void setScaleX(float scaleX) { 9398 ensureTransformationInfo(); 9399 final TransformationInfo info = mTransformationInfo; 9400 if (info.mScaleX != scaleX) { 9401 invalidateViewProperty(true, false); 9402 info.mScaleX = scaleX; 9403 info.mMatrixDirty = true; 9404 invalidateViewProperty(false, true); 9405 if (mDisplayList != null) { 9406 mDisplayList.setScaleX(scaleX); 9407 } 9408 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9409 // View was rejected last time it was drawn by its parent; this may have changed 9410 invalidateParentIfNeeded(); 9411 } 9412 } 9413 } 9414 9415 /** 9416 * The amount that the view is scaled in y around the pivot point, as a proportion of 9417 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9418 * 9419 * <p>By default, this is 1.0f. 9420 * 9421 * @see #getPivotX() 9422 * @see #getPivotY() 9423 * @return The scaling factor. 9424 */ 9425 @ViewDebug.ExportedProperty(category = "drawing") 9426 public float getScaleY() { 9427 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9428 } 9429 9430 /** 9431 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9432 * the view's unscaled width. A value of 1 means that no scaling is applied. 9433 * 9434 * @param scaleY The scaling factor. 9435 * @see #getPivotX() 9436 * @see #getPivotY() 9437 * 9438 * @attr ref android.R.styleable#View_scaleY 9439 */ 9440 public void setScaleY(float scaleY) { 9441 ensureTransformationInfo(); 9442 final TransformationInfo info = mTransformationInfo; 9443 if (info.mScaleY != scaleY) { 9444 invalidateViewProperty(true, false); 9445 info.mScaleY = scaleY; 9446 info.mMatrixDirty = true; 9447 invalidateViewProperty(false, true); 9448 if (mDisplayList != null) { 9449 mDisplayList.setScaleY(scaleY); 9450 } 9451 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9452 // View was rejected last time it was drawn by its parent; this may have changed 9453 invalidateParentIfNeeded(); 9454 } 9455 } 9456 } 9457 9458 /** 9459 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9460 * and {@link #setScaleX(float) scaled}. 9461 * 9462 * @see #getRotation() 9463 * @see #getScaleX() 9464 * @see #getScaleY() 9465 * @see #getPivotY() 9466 * @return The x location of the pivot point. 9467 * 9468 * @attr ref android.R.styleable#View_transformPivotX 9469 */ 9470 @ViewDebug.ExportedProperty(category = "drawing") 9471 public float getPivotX() { 9472 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9473 } 9474 9475 /** 9476 * Sets the x location of the point around which the view is 9477 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9478 * By default, the pivot point is centered on the object. 9479 * Setting this property disables this behavior and causes the view to use only the 9480 * explicitly set pivotX and pivotY values. 9481 * 9482 * @param pivotX The x location of the pivot point. 9483 * @see #getRotation() 9484 * @see #getScaleX() 9485 * @see #getScaleY() 9486 * @see #getPivotY() 9487 * 9488 * @attr ref android.R.styleable#View_transformPivotX 9489 */ 9490 public void setPivotX(float pivotX) { 9491 ensureTransformationInfo(); 9492 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9493 final TransformationInfo info = mTransformationInfo; 9494 if (info.mPivotX != pivotX) { 9495 invalidateViewProperty(true, false); 9496 info.mPivotX = pivotX; 9497 info.mMatrixDirty = true; 9498 invalidateViewProperty(false, true); 9499 if (mDisplayList != null) { 9500 mDisplayList.setPivotX(pivotX); 9501 } 9502 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9503 // View was rejected last time it was drawn by its parent; this may have changed 9504 invalidateParentIfNeeded(); 9505 } 9506 } 9507 } 9508 9509 /** 9510 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9511 * and {@link #setScaleY(float) scaled}. 9512 * 9513 * @see #getRotation() 9514 * @see #getScaleX() 9515 * @see #getScaleY() 9516 * @see #getPivotY() 9517 * @return The y location of the pivot point. 9518 * 9519 * @attr ref android.R.styleable#View_transformPivotY 9520 */ 9521 @ViewDebug.ExportedProperty(category = "drawing") 9522 public float getPivotY() { 9523 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9524 } 9525 9526 /** 9527 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9528 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9529 * Setting this property disables this behavior and causes the view to use only the 9530 * explicitly set pivotX and pivotY values. 9531 * 9532 * @param pivotY The y location of the pivot point. 9533 * @see #getRotation() 9534 * @see #getScaleX() 9535 * @see #getScaleY() 9536 * @see #getPivotY() 9537 * 9538 * @attr ref android.R.styleable#View_transformPivotY 9539 */ 9540 public void setPivotY(float pivotY) { 9541 ensureTransformationInfo(); 9542 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9543 final TransformationInfo info = mTransformationInfo; 9544 if (info.mPivotY != pivotY) { 9545 invalidateViewProperty(true, false); 9546 info.mPivotY = pivotY; 9547 info.mMatrixDirty = true; 9548 invalidateViewProperty(false, true); 9549 if (mDisplayList != null) { 9550 mDisplayList.setPivotY(pivotY); 9551 } 9552 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9553 // View was rejected last time it was drawn by its parent; this may have changed 9554 invalidateParentIfNeeded(); 9555 } 9556 } 9557 } 9558 9559 /** 9560 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9561 * completely transparent and 1 means the view is completely opaque. 9562 * 9563 * <p>By default this is 1.0f. 9564 * @return The opacity of the view. 9565 */ 9566 @ViewDebug.ExportedProperty(category = "drawing") 9567 public float getAlpha() { 9568 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9569 } 9570 9571 /** 9572 * Returns whether this View has content which overlaps. This function, intended to be 9573 * overridden by specific View types, is an optimization when alpha is set on a view. If 9574 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 9575 * and then composited it into place, which can be expensive. If the view has no overlapping 9576 * rendering, the view can draw each primitive with the appropriate alpha value directly. 9577 * An example of overlapping rendering is a TextView with a background image, such as a 9578 * Button. An example of non-overlapping rendering is a TextView with no background, or 9579 * an ImageView with only the foreground image. The default implementation returns true; 9580 * subclasses should override if they have cases which can be optimized. 9581 * 9582 * @return true if the content in this view might overlap, false otherwise. 9583 */ 9584 public boolean hasOverlappingRendering() { 9585 return true; 9586 } 9587 9588 /** 9589 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9590 * completely transparent and 1 means the view is completely opaque.</p> 9591 * 9592 * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant 9593 * performance implications, especially for large views. It is best to use the alpha property 9594 * sparingly and transiently, as in the case of fading animations.</p> 9595 * 9596 * <p>For a view with a frequently changing alpha, such as during a fading animation, it is 9597 * strongly recommended for performance reasons to either override 9598 * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a 9599 * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p> 9600 * 9601 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9602 * responsible for applying the opacity itself.</p> 9603 * 9604 * <p>Note that if the view is backed by a 9605 * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a 9606 * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than 9607 * 1.0 will supercede the alpha of the layer paint.</p> 9608 * 9609 * @param alpha The opacity of the view. 9610 * 9611 * @see #hasOverlappingRendering() 9612 * @see #setLayerType(int, android.graphics.Paint) 9613 * 9614 * @attr ref android.R.styleable#View_alpha 9615 */ 9616 public void setAlpha(float alpha) { 9617 ensureTransformationInfo(); 9618 if (mTransformationInfo.mAlpha != alpha) { 9619 mTransformationInfo.mAlpha = alpha; 9620 if (onSetAlpha((int) (alpha * 255))) { 9621 mPrivateFlags |= PFLAG_ALPHA_SET; 9622 // subclass is handling alpha - don't optimize rendering cache invalidation 9623 invalidateParentCaches(); 9624 invalidate(true); 9625 } else { 9626 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9627 invalidateViewProperty(true, false); 9628 if (mDisplayList != null) { 9629 mDisplayList.setAlpha(alpha); 9630 } 9631 } 9632 } 9633 } 9634 9635 /** 9636 * Faster version of setAlpha() which performs the same steps except there are 9637 * no calls to invalidate(). The caller of this function should perform proper invalidation 9638 * on the parent and this object. The return value indicates whether the subclass handles 9639 * alpha (the return value for onSetAlpha()). 9640 * 9641 * @param alpha The new value for the alpha property 9642 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9643 * the new value for the alpha property is different from the old value 9644 */ 9645 boolean setAlphaNoInvalidation(float alpha) { 9646 ensureTransformationInfo(); 9647 if (mTransformationInfo.mAlpha != alpha) { 9648 mTransformationInfo.mAlpha = alpha; 9649 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9650 if (subclassHandlesAlpha) { 9651 mPrivateFlags |= PFLAG_ALPHA_SET; 9652 return true; 9653 } else { 9654 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9655 if (mDisplayList != null) { 9656 mDisplayList.setAlpha(alpha); 9657 } 9658 } 9659 } 9660 return false; 9661 } 9662 9663 /** 9664 * Top position of this view relative to its parent. 9665 * 9666 * @return The top of this view, in pixels. 9667 */ 9668 @ViewDebug.CapturedViewProperty 9669 public final int getTop() { 9670 return mTop; 9671 } 9672 9673 /** 9674 * Sets the top position of this view relative to its parent. This method is meant to be called 9675 * by the layout system and should not generally be called otherwise, because the property 9676 * may be changed at any time by the layout. 9677 * 9678 * @param top The top of this view, in pixels. 9679 */ 9680 public final void setTop(int top) { 9681 if (top != mTop) { 9682 updateMatrix(); 9683 final boolean matrixIsIdentity = mTransformationInfo == null 9684 || mTransformationInfo.mMatrixIsIdentity; 9685 if (matrixIsIdentity) { 9686 if (mAttachInfo != null) { 9687 int minTop; 9688 int yLoc; 9689 if (top < mTop) { 9690 minTop = top; 9691 yLoc = top - mTop; 9692 } else { 9693 minTop = mTop; 9694 yLoc = 0; 9695 } 9696 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9697 } 9698 } else { 9699 // Double-invalidation is necessary to capture view's old and new areas 9700 invalidate(true); 9701 } 9702 9703 int width = mRight - mLeft; 9704 int oldHeight = mBottom - mTop; 9705 9706 mTop = top; 9707 if (mDisplayList != null) { 9708 mDisplayList.setTop(mTop); 9709 } 9710 9711 sizeChange(width, mBottom - mTop, width, oldHeight); 9712 9713 if (!matrixIsIdentity) { 9714 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9715 // A change in dimension means an auto-centered pivot point changes, too 9716 mTransformationInfo.mMatrixDirty = true; 9717 } 9718 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9719 invalidate(true); 9720 } 9721 mBackgroundSizeChanged = true; 9722 invalidateParentIfNeeded(); 9723 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9724 // View was rejected last time it was drawn by its parent; this may have changed 9725 invalidateParentIfNeeded(); 9726 } 9727 } 9728 } 9729 9730 /** 9731 * Bottom position of this view relative to its parent. 9732 * 9733 * @return The bottom of this view, in pixels. 9734 */ 9735 @ViewDebug.CapturedViewProperty 9736 public final int getBottom() { 9737 return mBottom; 9738 } 9739 9740 /** 9741 * True if this view has changed since the last time being drawn. 9742 * 9743 * @return The dirty state of this view. 9744 */ 9745 public boolean isDirty() { 9746 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 9747 } 9748 9749 /** 9750 * Sets the bottom position of this view relative to its parent. This method is meant to be 9751 * called by the layout system and should not generally be called otherwise, because the 9752 * property may be changed at any time by the layout. 9753 * 9754 * @param bottom The bottom of this view, in pixels. 9755 */ 9756 public final void setBottom(int bottom) { 9757 if (bottom != mBottom) { 9758 updateMatrix(); 9759 final boolean matrixIsIdentity = mTransformationInfo == null 9760 || mTransformationInfo.mMatrixIsIdentity; 9761 if (matrixIsIdentity) { 9762 if (mAttachInfo != null) { 9763 int maxBottom; 9764 if (bottom < mBottom) { 9765 maxBottom = mBottom; 9766 } else { 9767 maxBottom = bottom; 9768 } 9769 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9770 } 9771 } else { 9772 // Double-invalidation is necessary to capture view's old and new areas 9773 invalidate(true); 9774 } 9775 9776 int width = mRight - mLeft; 9777 int oldHeight = mBottom - mTop; 9778 9779 mBottom = bottom; 9780 if (mDisplayList != null) { 9781 mDisplayList.setBottom(mBottom); 9782 } 9783 9784 sizeChange(width, mBottom - mTop, width, oldHeight); 9785 9786 if (!matrixIsIdentity) { 9787 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9788 // A change in dimension means an auto-centered pivot point changes, too 9789 mTransformationInfo.mMatrixDirty = true; 9790 } 9791 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9792 invalidate(true); 9793 } 9794 mBackgroundSizeChanged = true; 9795 invalidateParentIfNeeded(); 9796 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9797 // View was rejected last time it was drawn by its parent; this may have changed 9798 invalidateParentIfNeeded(); 9799 } 9800 } 9801 } 9802 9803 /** 9804 * Left position of this view relative to its parent. 9805 * 9806 * @return The left edge of this view, in pixels. 9807 */ 9808 @ViewDebug.CapturedViewProperty 9809 public final int getLeft() { 9810 return mLeft; 9811 } 9812 9813 /** 9814 * Sets the left position of this view relative to its parent. This method is meant to be called 9815 * by the layout system and should not generally be called otherwise, because the property 9816 * may be changed at any time by the layout. 9817 * 9818 * @param left The bottom of this view, in pixels. 9819 */ 9820 public final void setLeft(int left) { 9821 if (left != mLeft) { 9822 updateMatrix(); 9823 final boolean matrixIsIdentity = mTransformationInfo == null 9824 || mTransformationInfo.mMatrixIsIdentity; 9825 if (matrixIsIdentity) { 9826 if (mAttachInfo != null) { 9827 int minLeft; 9828 int xLoc; 9829 if (left < mLeft) { 9830 minLeft = left; 9831 xLoc = left - mLeft; 9832 } else { 9833 minLeft = mLeft; 9834 xLoc = 0; 9835 } 9836 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9837 } 9838 } else { 9839 // Double-invalidation is necessary to capture view's old and new areas 9840 invalidate(true); 9841 } 9842 9843 int oldWidth = mRight - mLeft; 9844 int height = mBottom - mTop; 9845 9846 mLeft = left; 9847 if (mDisplayList != null) { 9848 mDisplayList.setLeft(left); 9849 } 9850 9851 sizeChange(mRight - mLeft, height, oldWidth, height); 9852 9853 if (!matrixIsIdentity) { 9854 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9855 // A change in dimension means an auto-centered pivot point changes, too 9856 mTransformationInfo.mMatrixDirty = true; 9857 } 9858 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9859 invalidate(true); 9860 } 9861 mBackgroundSizeChanged = true; 9862 invalidateParentIfNeeded(); 9863 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9864 // View was rejected last time it was drawn by its parent; this may have changed 9865 invalidateParentIfNeeded(); 9866 } 9867 } 9868 } 9869 9870 /** 9871 * Right position of this view relative to its parent. 9872 * 9873 * @return The right edge of this view, in pixels. 9874 */ 9875 @ViewDebug.CapturedViewProperty 9876 public final int getRight() { 9877 return mRight; 9878 } 9879 9880 /** 9881 * Sets the right position of this view relative to its parent. This method is meant to be called 9882 * by the layout system and should not generally be called otherwise, because the property 9883 * may be changed at any time by the layout. 9884 * 9885 * @param right The bottom of this view, in pixels. 9886 */ 9887 public final void setRight(int right) { 9888 if (right != mRight) { 9889 updateMatrix(); 9890 final boolean matrixIsIdentity = mTransformationInfo == null 9891 || mTransformationInfo.mMatrixIsIdentity; 9892 if (matrixIsIdentity) { 9893 if (mAttachInfo != null) { 9894 int maxRight; 9895 if (right < mRight) { 9896 maxRight = mRight; 9897 } else { 9898 maxRight = right; 9899 } 9900 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9901 } 9902 } else { 9903 // Double-invalidation is necessary to capture view's old and new areas 9904 invalidate(true); 9905 } 9906 9907 int oldWidth = mRight - mLeft; 9908 int height = mBottom - mTop; 9909 9910 mRight = right; 9911 if (mDisplayList != null) { 9912 mDisplayList.setRight(mRight); 9913 } 9914 9915 sizeChange(mRight - mLeft, height, oldWidth, height); 9916 9917 if (!matrixIsIdentity) { 9918 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9919 // A change in dimension means an auto-centered pivot point changes, too 9920 mTransformationInfo.mMatrixDirty = true; 9921 } 9922 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9923 invalidate(true); 9924 } 9925 mBackgroundSizeChanged = true; 9926 invalidateParentIfNeeded(); 9927 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9928 // View was rejected last time it was drawn by its parent; this may have changed 9929 invalidateParentIfNeeded(); 9930 } 9931 } 9932 } 9933 9934 /** 9935 * The visual x position of this view, in pixels. This is equivalent to the 9936 * {@link #setTranslationX(float) translationX} property plus the current 9937 * {@link #getLeft() left} property. 9938 * 9939 * @return The visual x position of this view, in pixels. 9940 */ 9941 @ViewDebug.ExportedProperty(category = "drawing") 9942 public float getX() { 9943 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9944 } 9945 9946 /** 9947 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9948 * {@link #setTranslationX(float) translationX} property to be the difference between 9949 * the x value passed in and the current {@link #getLeft() left} property. 9950 * 9951 * @param x The visual x position of this view, in pixels. 9952 */ 9953 public void setX(float x) { 9954 setTranslationX(x - mLeft); 9955 } 9956 9957 /** 9958 * The visual y position of this view, in pixels. This is equivalent to the 9959 * {@link #setTranslationY(float) translationY} property plus the current 9960 * {@link #getTop() top} property. 9961 * 9962 * @return The visual y position of this view, in pixels. 9963 */ 9964 @ViewDebug.ExportedProperty(category = "drawing") 9965 public float getY() { 9966 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9967 } 9968 9969 /** 9970 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9971 * {@link #setTranslationY(float) translationY} property to be the difference between 9972 * the y value passed in and the current {@link #getTop() top} property. 9973 * 9974 * @param y The visual y position of this view, in pixels. 9975 */ 9976 public void setY(float y) { 9977 setTranslationY(y - mTop); 9978 } 9979 9980 9981 /** 9982 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9983 * This position is post-layout, in addition to wherever the object's 9984 * layout placed it. 9985 * 9986 * @return The horizontal position of this view relative to its left position, in pixels. 9987 */ 9988 @ViewDebug.ExportedProperty(category = "drawing") 9989 public float getTranslationX() { 9990 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9991 } 9992 9993 /** 9994 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9995 * This effectively positions the object post-layout, in addition to wherever the object's 9996 * layout placed it. 9997 * 9998 * @param translationX The horizontal position of this view relative to its left position, 9999 * in pixels. 10000 * 10001 * @attr ref android.R.styleable#View_translationX 10002 */ 10003 public void setTranslationX(float translationX) { 10004 ensureTransformationInfo(); 10005 final TransformationInfo info = mTransformationInfo; 10006 if (info.mTranslationX != translationX) { 10007 // Double-invalidation is necessary to capture view's old and new areas 10008 invalidateViewProperty(true, false); 10009 info.mTranslationX = translationX; 10010 info.mMatrixDirty = true; 10011 invalidateViewProperty(false, true); 10012 if (mDisplayList != null) { 10013 mDisplayList.setTranslationX(translationX); 10014 } 10015 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10016 // View was rejected last time it was drawn by its parent; this may have changed 10017 invalidateParentIfNeeded(); 10018 } 10019 } 10020 } 10021 10022 /** 10023 * The horizontal location of this view relative to its {@link #getTop() top} position. 10024 * This position is post-layout, in addition to wherever the object's 10025 * layout placed it. 10026 * 10027 * @return The vertical position of this view relative to its top position, 10028 * in pixels. 10029 */ 10030 @ViewDebug.ExportedProperty(category = "drawing") 10031 public float getTranslationY() { 10032 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 10033 } 10034 10035 /** 10036 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 10037 * This effectively positions the object post-layout, in addition to wherever the object's 10038 * layout placed it. 10039 * 10040 * @param translationY The vertical position of this view relative to its top position, 10041 * in pixels. 10042 * 10043 * @attr ref android.R.styleable#View_translationY 10044 */ 10045 public void setTranslationY(float translationY) { 10046 ensureTransformationInfo(); 10047 final TransformationInfo info = mTransformationInfo; 10048 if (info.mTranslationY != translationY) { 10049 invalidateViewProperty(true, false); 10050 info.mTranslationY = translationY; 10051 info.mMatrixDirty = true; 10052 invalidateViewProperty(false, true); 10053 if (mDisplayList != null) { 10054 mDisplayList.setTranslationY(translationY); 10055 } 10056 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10057 // View was rejected last time it was drawn by its parent; this may have changed 10058 invalidateParentIfNeeded(); 10059 } 10060 } 10061 } 10062 10063 /** 10064 * Hit rectangle in parent's coordinates 10065 * 10066 * @param outRect The hit rectangle of the view. 10067 */ 10068 public void getHitRect(Rect outRect) { 10069 updateMatrix(); 10070 final TransformationInfo info = mTransformationInfo; 10071 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 10072 outRect.set(mLeft, mTop, mRight, mBottom); 10073 } else { 10074 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 10075 tmpRect.set(0, 0, getWidth(), getHeight()); 10076 info.mMatrix.mapRect(tmpRect); 10077 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 10078 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 10079 } 10080 } 10081 10082 /** 10083 * Determines whether the given point, in local coordinates is inside the view. 10084 */ 10085 /*package*/ final boolean pointInView(float localX, float localY) { 10086 return localX >= 0 && localX < (mRight - mLeft) 10087 && localY >= 0 && localY < (mBottom - mTop); 10088 } 10089 10090 /** 10091 * Utility method to determine whether the given point, in local coordinates, 10092 * is inside the view, where the area of the view is expanded by the slop factor. 10093 * This method is called while processing touch-move events to determine if the event 10094 * is still within the view. 10095 * 10096 * @hide 10097 */ 10098 public boolean pointInView(float localX, float localY, float slop) { 10099 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 10100 localY < ((mBottom - mTop) + slop); 10101 } 10102 10103 /** 10104 * When a view has focus and the user navigates away from it, the next view is searched for 10105 * starting from the rectangle filled in by this method. 10106 * 10107 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 10108 * of the view. However, if your view maintains some idea of internal selection, 10109 * such as a cursor, or a selected row or column, you should override this method and 10110 * fill in a more specific rectangle. 10111 * 10112 * @param r The rectangle to fill in, in this view's coordinates. 10113 */ 10114 public void getFocusedRect(Rect r) { 10115 getDrawingRect(r); 10116 } 10117 10118 /** 10119 * If some part of this view is not clipped by any of its parents, then 10120 * return that area in r in global (root) coordinates. To convert r to local 10121 * coordinates (without taking possible View rotations into account), offset 10122 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 10123 * If the view is completely clipped or translated out, return false. 10124 * 10125 * @param r If true is returned, r holds the global coordinates of the 10126 * visible portion of this view. 10127 * @param globalOffset If true is returned, globalOffset holds the dx,dy 10128 * between this view and its root. globalOffet may be null. 10129 * @return true if r is non-empty (i.e. part of the view is visible at the 10130 * root level. 10131 */ 10132 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 10133 int width = mRight - mLeft; 10134 int height = mBottom - mTop; 10135 if (width > 0 && height > 0) { 10136 r.set(0, 0, width, height); 10137 if (globalOffset != null) { 10138 globalOffset.set(-mScrollX, -mScrollY); 10139 } 10140 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 10141 } 10142 return false; 10143 } 10144 10145 public final boolean getGlobalVisibleRect(Rect r) { 10146 return getGlobalVisibleRect(r, null); 10147 } 10148 10149 public final boolean getLocalVisibleRect(Rect r) { 10150 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 10151 if (getGlobalVisibleRect(r, offset)) { 10152 r.offset(-offset.x, -offset.y); // make r local 10153 return true; 10154 } 10155 return false; 10156 } 10157 10158 /** 10159 * Offset this view's vertical location by the specified number of pixels. 10160 * 10161 * @param offset the number of pixels to offset the view by 10162 */ 10163 public void offsetTopAndBottom(int offset) { 10164 if (offset != 0) { 10165 updateMatrix(); 10166 final boolean matrixIsIdentity = mTransformationInfo == null 10167 || mTransformationInfo.mMatrixIsIdentity; 10168 if (matrixIsIdentity) { 10169 if (mDisplayList != null) { 10170 invalidateViewProperty(false, false); 10171 } else { 10172 final ViewParent p = mParent; 10173 if (p != null && mAttachInfo != null) { 10174 final Rect r = mAttachInfo.mTmpInvalRect; 10175 int minTop; 10176 int maxBottom; 10177 int yLoc; 10178 if (offset < 0) { 10179 minTop = mTop + offset; 10180 maxBottom = mBottom; 10181 yLoc = offset; 10182 } else { 10183 minTop = mTop; 10184 maxBottom = mBottom + offset; 10185 yLoc = 0; 10186 } 10187 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 10188 p.invalidateChild(this, r); 10189 } 10190 } 10191 } else { 10192 invalidateViewProperty(false, false); 10193 } 10194 10195 mTop += offset; 10196 mBottom += offset; 10197 if (mDisplayList != null) { 10198 mDisplayList.offsetTopAndBottom(offset); 10199 invalidateViewProperty(false, false); 10200 } else { 10201 if (!matrixIsIdentity) { 10202 invalidateViewProperty(false, true); 10203 } 10204 invalidateParentIfNeeded(); 10205 } 10206 } 10207 } 10208 10209 /** 10210 * Offset this view's horizontal location by the specified amount of pixels. 10211 * 10212 * @param offset the number of pixels to offset the view by 10213 */ 10214 public void offsetLeftAndRight(int offset) { 10215 if (offset != 0) { 10216 updateMatrix(); 10217 final boolean matrixIsIdentity = mTransformationInfo == null 10218 || mTransformationInfo.mMatrixIsIdentity; 10219 if (matrixIsIdentity) { 10220 if (mDisplayList != null) { 10221 invalidateViewProperty(false, false); 10222 } else { 10223 final ViewParent p = mParent; 10224 if (p != null && mAttachInfo != null) { 10225 final Rect r = mAttachInfo.mTmpInvalRect; 10226 int minLeft; 10227 int maxRight; 10228 if (offset < 0) { 10229 minLeft = mLeft + offset; 10230 maxRight = mRight; 10231 } else { 10232 minLeft = mLeft; 10233 maxRight = mRight + offset; 10234 } 10235 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 10236 p.invalidateChild(this, r); 10237 } 10238 } 10239 } else { 10240 invalidateViewProperty(false, false); 10241 } 10242 10243 mLeft += offset; 10244 mRight += offset; 10245 if (mDisplayList != null) { 10246 mDisplayList.offsetLeftAndRight(offset); 10247 invalidateViewProperty(false, false); 10248 } else { 10249 if (!matrixIsIdentity) { 10250 invalidateViewProperty(false, true); 10251 } 10252 invalidateParentIfNeeded(); 10253 } 10254 } 10255 } 10256 10257 /** 10258 * Get the LayoutParams associated with this view. All views should have 10259 * layout parameters. These supply parameters to the <i>parent</i> of this 10260 * view specifying how it should be arranged. There are many subclasses of 10261 * ViewGroup.LayoutParams, and these correspond to the different subclasses 10262 * of ViewGroup that are responsible for arranging their children. 10263 * 10264 * This method may return null if this View is not attached to a parent 10265 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 10266 * was not invoked successfully. When a View is attached to a parent 10267 * ViewGroup, this method must not return null. 10268 * 10269 * @return The LayoutParams associated with this view, or null if no 10270 * parameters have been set yet 10271 */ 10272 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 10273 public ViewGroup.LayoutParams getLayoutParams() { 10274 return mLayoutParams; 10275 } 10276 10277 /** 10278 * Set the layout parameters associated with this view. These supply 10279 * parameters to the <i>parent</i> of this view specifying how it should be 10280 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 10281 * correspond to the different subclasses of ViewGroup that are responsible 10282 * for arranging their children. 10283 * 10284 * @param params The layout parameters for this view, cannot be null 10285 */ 10286 public void setLayoutParams(ViewGroup.LayoutParams params) { 10287 if (params == null) { 10288 throw new NullPointerException("Layout parameters cannot be null"); 10289 } 10290 mLayoutParams = params; 10291 resolveLayoutParams(); 10292 if (mParent instanceof ViewGroup) { 10293 ((ViewGroup) mParent).onSetLayoutParams(this, params); 10294 } 10295 requestLayout(); 10296 } 10297 10298 /** 10299 * Resolve the layout parameters depending on the resolved layout direction 10300 * 10301 * @hide 10302 */ 10303 public void resolveLayoutParams() { 10304 if (mLayoutParams != null) { 10305 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10306 } 10307 } 10308 10309 /** 10310 * Set the scrolled position of your view. This will cause a call to 10311 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10312 * invalidated. 10313 * @param x the x position to scroll to 10314 * @param y the y position to scroll to 10315 */ 10316 public void scrollTo(int x, int y) { 10317 if (mScrollX != x || mScrollY != y) { 10318 int oldX = mScrollX; 10319 int oldY = mScrollY; 10320 mScrollX = x; 10321 mScrollY = y; 10322 invalidateParentCaches(); 10323 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10324 if (!awakenScrollBars()) { 10325 postInvalidateOnAnimation(); 10326 } 10327 } 10328 } 10329 10330 /** 10331 * Move the scrolled position of your view. This will cause a call to 10332 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10333 * invalidated. 10334 * @param x the amount of pixels to scroll by horizontally 10335 * @param y the amount of pixels to scroll by vertically 10336 */ 10337 public void scrollBy(int x, int y) { 10338 scrollTo(mScrollX + x, mScrollY + y); 10339 } 10340 10341 /** 10342 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10343 * animation to fade the scrollbars out after a default delay. If a subclass 10344 * provides animated scrolling, the start delay should equal the duration 10345 * of the scrolling animation.</p> 10346 * 10347 * <p>The animation starts only if at least one of the scrollbars is 10348 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10349 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10350 * this method returns true, and false otherwise. If the animation is 10351 * started, this method calls {@link #invalidate()}; in that case the 10352 * caller should not call {@link #invalidate()}.</p> 10353 * 10354 * <p>This method should be invoked every time a subclass directly updates 10355 * the scroll parameters.</p> 10356 * 10357 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10358 * and {@link #scrollTo(int, int)}.</p> 10359 * 10360 * @return true if the animation is played, false otherwise 10361 * 10362 * @see #awakenScrollBars(int) 10363 * @see #scrollBy(int, int) 10364 * @see #scrollTo(int, int) 10365 * @see #isHorizontalScrollBarEnabled() 10366 * @see #isVerticalScrollBarEnabled() 10367 * @see #setHorizontalScrollBarEnabled(boolean) 10368 * @see #setVerticalScrollBarEnabled(boolean) 10369 */ 10370 protected boolean awakenScrollBars() { 10371 return mScrollCache != null && 10372 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10373 } 10374 10375 /** 10376 * Trigger the scrollbars to draw. 10377 * This method differs from awakenScrollBars() only in its default duration. 10378 * initialAwakenScrollBars() will show the scroll bars for longer than 10379 * usual to give the user more of a chance to notice them. 10380 * 10381 * @return true if the animation is played, false otherwise. 10382 */ 10383 private boolean initialAwakenScrollBars() { 10384 return mScrollCache != null && 10385 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10386 } 10387 10388 /** 10389 * <p> 10390 * Trigger the scrollbars to draw. When invoked this method starts an 10391 * animation to fade the scrollbars out after a fixed delay. If a subclass 10392 * provides animated scrolling, the start delay should equal the duration of 10393 * the scrolling animation. 10394 * </p> 10395 * 10396 * <p> 10397 * The animation starts only if at least one of the scrollbars is enabled, 10398 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10399 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10400 * this method returns true, and false otherwise. If the animation is 10401 * started, this method calls {@link #invalidate()}; in that case the caller 10402 * should not call {@link #invalidate()}. 10403 * </p> 10404 * 10405 * <p> 10406 * This method should be invoked everytime a subclass directly updates the 10407 * scroll parameters. 10408 * </p> 10409 * 10410 * @param startDelay the delay, in milliseconds, after which the animation 10411 * should start; when the delay is 0, the animation starts 10412 * immediately 10413 * @return true if the animation is played, false otherwise 10414 * 10415 * @see #scrollBy(int, int) 10416 * @see #scrollTo(int, int) 10417 * @see #isHorizontalScrollBarEnabled() 10418 * @see #isVerticalScrollBarEnabled() 10419 * @see #setHorizontalScrollBarEnabled(boolean) 10420 * @see #setVerticalScrollBarEnabled(boolean) 10421 */ 10422 protected boolean awakenScrollBars(int startDelay) { 10423 return awakenScrollBars(startDelay, true); 10424 } 10425 10426 /** 10427 * <p> 10428 * Trigger the scrollbars to draw. When invoked this method starts an 10429 * animation to fade the scrollbars out after a fixed delay. If a subclass 10430 * provides animated scrolling, the start delay should equal the duration of 10431 * the scrolling animation. 10432 * </p> 10433 * 10434 * <p> 10435 * The animation starts only if at least one of the scrollbars is enabled, 10436 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10437 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10438 * this method returns true, and false otherwise. If the animation is 10439 * started, this method calls {@link #invalidate()} if the invalidate parameter 10440 * is set to true; in that case the caller 10441 * should not call {@link #invalidate()}. 10442 * </p> 10443 * 10444 * <p> 10445 * This method should be invoked everytime a subclass directly updates the 10446 * scroll parameters. 10447 * </p> 10448 * 10449 * @param startDelay the delay, in milliseconds, after which the animation 10450 * should start; when the delay is 0, the animation starts 10451 * immediately 10452 * 10453 * @param invalidate Wheter this method should call invalidate 10454 * 10455 * @return true if the animation is played, false otherwise 10456 * 10457 * @see #scrollBy(int, int) 10458 * @see #scrollTo(int, int) 10459 * @see #isHorizontalScrollBarEnabled() 10460 * @see #isVerticalScrollBarEnabled() 10461 * @see #setHorizontalScrollBarEnabled(boolean) 10462 * @see #setVerticalScrollBarEnabled(boolean) 10463 */ 10464 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10465 final ScrollabilityCache scrollCache = mScrollCache; 10466 10467 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10468 return false; 10469 } 10470 10471 if (scrollCache.scrollBar == null) { 10472 scrollCache.scrollBar = new ScrollBarDrawable(); 10473 } 10474 10475 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10476 10477 if (invalidate) { 10478 // Invalidate to show the scrollbars 10479 postInvalidateOnAnimation(); 10480 } 10481 10482 if (scrollCache.state == ScrollabilityCache.OFF) { 10483 // FIXME: this is copied from WindowManagerService. 10484 // We should get this value from the system when it 10485 // is possible to do so. 10486 final int KEY_REPEAT_FIRST_DELAY = 750; 10487 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10488 } 10489 10490 // Tell mScrollCache when we should start fading. This may 10491 // extend the fade start time if one was already scheduled 10492 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10493 scrollCache.fadeStartTime = fadeStartTime; 10494 scrollCache.state = ScrollabilityCache.ON; 10495 10496 // Schedule our fader to run, unscheduling any old ones first 10497 if (mAttachInfo != null) { 10498 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10499 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10500 } 10501 10502 return true; 10503 } 10504 10505 return false; 10506 } 10507 10508 /** 10509 * Do not invalidate views which are not visible and which are not running an animation. They 10510 * will not get drawn and they should not set dirty flags as if they will be drawn 10511 */ 10512 private boolean skipInvalidate() { 10513 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10514 (!(mParent instanceof ViewGroup) || 10515 !((ViewGroup) mParent).isViewTransitioning(this)); 10516 } 10517 /** 10518 * Mark the area defined by dirty as needing to be drawn. If the view is 10519 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10520 * in the future. This must be called from a UI thread. To call from a non-UI 10521 * thread, call {@link #postInvalidate()}. 10522 * 10523 * WARNING: This method is destructive to dirty. 10524 * @param dirty the rectangle representing the bounds of the dirty region 10525 */ 10526 public void invalidate(Rect dirty) { 10527 if (skipInvalidate()) { 10528 return; 10529 } 10530 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10531 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10532 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10533 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10534 mPrivateFlags |= PFLAG_INVALIDATED; 10535 mPrivateFlags |= PFLAG_DIRTY; 10536 final ViewParent p = mParent; 10537 final AttachInfo ai = mAttachInfo; 10538 //noinspection PointlessBooleanExpression,ConstantConditions 10539 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10540 if (p != null && ai != null && ai.mHardwareAccelerated) { 10541 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10542 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10543 p.invalidateChild(this, null); 10544 return; 10545 } 10546 } 10547 if (p != null && ai != null) { 10548 final int scrollX = mScrollX; 10549 final int scrollY = mScrollY; 10550 final Rect r = ai.mTmpInvalRect; 10551 r.set(dirty.left - scrollX, dirty.top - scrollY, 10552 dirty.right - scrollX, dirty.bottom - scrollY); 10553 mParent.invalidateChild(this, r); 10554 } 10555 } 10556 } 10557 10558 /** 10559 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10560 * The coordinates of the dirty rect are relative to the view. 10561 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10562 * will be called at some point in the future. This must be called from 10563 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10564 * @param l the left position of the dirty region 10565 * @param t the top position of the dirty region 10566 * @param r the right position of the dirty region 10567 * @param b the bottom position of the dirty region 10568 */ 10569 public void invalidate(int l, int t, int r, int b) { 10570 if (skipInvalidate()) { 10571 return; 10572 } 10573 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10574 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10575 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10576 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10577 mPrivateFlags |= PFLAG_INVALIDATED; 10578 mPrivateFlags |= PFLAG_DIRTY; 10579 final ViewParent p = mParent; 10580 final AttachInfo ai = mAttachInfo; 10581 //noinspection PointlessBooleanExpression,ConstantConditions 10582 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10583 if (p != null && ai != null && ai.mHardwareAccelerated) { 10584 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10585 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10586 p.invalidateChild(this, null); 10587 return; 10588 } 10589 } 10590 if (p != null && ai != null && l < r && t < b) { 10591 final int scrollX = mScrollX; 10592 final int scrollY = mScrollY; 10593 final Rect tmpr = ai.mTmpInvalRect; 10594 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10595 p.invalidateChild(this, tmpr); 10596 } 10597 } 10598 } 10599 10600 /** 10601 * Invalidate the whole view. If the view is visible, 10602 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10603 * the future. This must be called from a UI thread. To call from a non-UI thread, 10604 * call {@link #postInvalidate()}. 10605 */ 10606 public void invalidate() { 10607 invalidate(true); 10608 } 10609 10610 /** 10611 * This is where the invalidate() work actually happens. A full invalidate() 10612 * causes the drawing cache to be invalidated, but this function can be called with 10613 * invalidateCache set to false to skip that invalidation step for cases that do not 10614 * need it (for example, a component that remains at the same dimensions with the same 10615 * content). 10616 * 10617 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10618 * well. This is usually true for a full invalidate, but may be set to false if the 10619 * View's contents or dimensions have not changed. 10620 */ 10621 void invalidate(boolean invalidateCache) { 10622 if (skipInvalidate()) { 10623 return; 10624 } 10625 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10626 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10627 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10628 mLastIsOpaque = isOpaque(); 10629 mPrivateFlags &= ~PFLAG_DRAWN; 10630 mPrivateFlags |= PFLAG_DIRTY; 10631 if (invalidateCache) { 10632 mPrivateFlags |= PFLAG_INVALIDATED; 10633 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10634 } 10635 final AttachInfo ai = mAttachInfo; 10636 final ViewParent p = mParent; 10637 //noinspection PointlessBooleanExpression,ConstantConditions 10638 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10639 if (p != null && ai != null && ai.mHardwareAccelerated) { 10640 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10641 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10642 p.invalidateChild(this, null); 10643 return; 10644 } 10645 } 10646 10647 if (p != null && ai != null) { 10648 final Rect r = ai.mTmpInvalRect; 10649 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10650 // Don't call invalidate -- we don't want to internally scroll 10651 // our own bounds 10652 p.invalidateChild(this, r); 10653 } 10654 } 10655 } 10656 10657 /** 10658 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10659 * set any flags or handle all of the cases handled by the default invalidation methods. 10660 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10661 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10662 * walk up the hierarchy, transforming the dirty rect as necessary. 10663 * 10664 * The method also handles normal invalidation logic if display list properties are not 10665 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10666 * backup approach, to handle these cases used in the various property-setting methods. 10667 * 10668 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10669 * are not being used in this view 10670 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10671 * list properties are not being used in this view 10672 */ 10673 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10674 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10675 if (invalidateParent) { 10676 invalidateParentCaches(); 10677 } 10678 if (forceRedraw) { 10679 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10680 } 10681 invalidate(false); 10682 } else { 10683 final AttachInfo ai = mAttachInfo; 10684 final ViewParent p = mParent; 10685 if (p != null && ai != null) { 10686 final Rect r = ai.mTmpInvalRect; 10687 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10688 if (mParent instanceof ViewGroup) { 10689 ((ViewGroup) mParent).invalidateChildFast(this, r); 10690 } else { 10691 mParent.invalidateChild(this, r); 10692 } 10693 } 10694 } 10695 } 10696 10697 /** 10698 * Utility method to transform a given Rect by the current matrix of this view. 10699 */ 10700 void transformRect(final Rect rect) { 10701 if (!getMatrix().isIdentity()) { 10702 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10703 boundingRect.set(rect); 10704 getMatrix().mapRect(boundingRect); 10705 rect.set((int) Math.floor(boundingRect.left), 10706 (int) Math.floor(boundingRect.top), 10707 (int) Math.ceil(boundingRect.right), 10708 (int) Math.ceil(boundingRect.bottom)); 10709 } 10710 } 10711 10712 /** 10713 * Used to indicate that the parent of this view should clear its caches. This functionality 10714 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10715 * which is necessary when various parent-managed properties of the view change, such as 10716 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10717 * clears the parent caches and does not causes an invalidate event. 10718 * 10719 * @hide 10720 */ 10721 protected void invalidateParentCaches() { 10722 if (mParent instanceof View) { 10723 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10724 } 10725 } 10726 10727 /** 10728 * Used to indicate that the parent of this view should be invalidated. This functionality 10729 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10730 * which is necessary when various parent-managed properties of the view change, such as 10731 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10732 * an invalidation event to the parent. 10733 * 10734 * @hide 10735 */ 10736 protected void invalidateParentIfNeeded() { 10737 if (isHardwareAccelerated() && mParent instanceof View) { 10738 ((View) mParent).invalidate(true); 10739 } 10740 } 10741 10742 /** 10743 * Indicates whether this View is opaque. An opaque View guarantees that it will 10744 * draw all the pixels overlapping its bounds using a fully opaque color. 10745 * 10746 * Subclasses of View should override this method whenever possible to indicate 10747 * whether an instance is opaque. Opaque Views are treated in a special way by 10748 * the View hierarchy, possibly allowing it to perform optimizations during 10749 * invalidate/draw passes. 10750 * 10751 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10752 */ 10753 @ViewDebug.ExportedProperty(category = "drawing") 10754 public boolean isOpaque() { 10755 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 10756 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10757 } 10758 10759 /** 10760 * @hide 10761 */ 10762 protected void computeOpaqueFlags() { 10763 // Opaque if: 10764 // - Has a background 10765 // - Background is opaque 10766 // - Doesn't have scrollbars or scrollbars overlay 10767 10768 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10769 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 10770 } else { 10771 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 10772 } 10773 10774 final int flags = mViewFlags; 10775 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10776 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || 10777 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { 10778 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 10779 } else { 10780 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 10781 } 10782 } 10783 10784 /** 10785 * @hide 10786 */ 10787 protected boolean hasOpaqueScrollbars() { 10788 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 10789 } 10790 10791 /** 10792 * @return A handler associated with the thread running the View. This 10793 * handler can be used to pump events in the UI events queue. 10794 */ 10795 public Handler getHandler() { 10796 final AttachInfo attachInfo = mAttachInfo; 10797 if (attachInfo != null) { 10798 return attachInfo.mHandler; 10799 } 10800 return null; 10801 } 10802 10803 /** 10804 * Gets the view root associated with the View. 10805 * @return The view root, or null if none. 10806 * @hide 10807 */ 10808 public ViewRootImpl getViewRootImpl() { 10809 if (mAttachInfo != null) { 10810 return mAttachInfo.mViewRootImpl; 10811 } 10812 return null; 10813 } 10814 10815 /** 10816 * <p>Causes the Runnable to be added to the message queue. 10817 * The runnable will be run on the user interface thread.</p> 10818 * 10819 * @param action The Runnable that will be executed. 10820 * 10821 * @return Returns true if the Runnable was successfully placed in to the 10822 * message queue. Returns false on failure, usually because the 10823 * looper processing the message queue is exiting. 10824 * 10825 * @see #postDelayed 10826 * @see #removeCallbacks 10827 */ 10828 public boolean post(Runnable action) { 10829 final AttachInfo attachInfo = mAttachInfo; 10830 if (attachInfo != null) { 10831 return attachInfo.mHandler.post(action); 10832 } 10833 // Assume that post will succeed later 10834 ViewRootImpl.getRunQueue().post(action); 10835 return true; 10836 } 10837 10838 /** 10839 * <p>Causes the Runnable to be added to the message queue, to be run 10840 * after the specified amount of time elapses. 10841 * The runnable will be run on the user interface thread.</p> 10842 * 10843 * @param action The Runnable that will be executed. 10844 * @param delayMillis The delay (in milliseconds) until the Runnable 10845 * will be executed. 10846 * 10847 * @return true if the Runnable was successfully placed in to the 10848 * message queue. Returns false on failure, usually because the 10849 * looper processing the message queue is exiting. Note that a 10850 * result of true does not mean the Runnable will be processed -- 10851 * if the looper is quit before the delivery time of the message 10852 * occurs then the message will be dropped. 10853 * 10854 * @see #post 10855 * @see #removeCallbacks 10856 */ 10857 public boolean postDelayed(Runnable action, long delayMillis) { 10858 final AttachInfo attachInfo = mAttachInfo; 10859 if (attachInfo != null) { 10860 return attachInfo.mHandler.postDelayed(action, delayMillis); 10861 } 10862 // Assume that post will succeed later 10863 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10864 return true; 10865 } 10866 10867 /** 10868 * <p>Causes the Runnable to execute on the next animation time step. 10869 * The runnable will be run on the user interface thread.</p> 10870 * 10871 * @param action The Runnable that will be executed. 10872 * 10873 * @see #postOnAnimationDelayed 10874 * @see #removeCallbacks 10875 */ 10876 public void postOnAnimation(Runnable action) { 10877 final AttachInfo attachInfo = mAttachInfo; 10878 if (attachInfo != null) { 10879 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10880 Choreographer.CALLBACK_ANIMATION, action, null); 10881 } else { 10882 // Assume that post will succeed later 10883 ViewRootImpl.getRunQueue().post(action); 10884 } 10885 } 10886 10887 /** 10888 * <p>Causes the Runnable to execute on the next animation time step, 10889 * after the specified amount of time elapses. 10890 * The runnable will be run on the user interface thread.</p> 10891 * 10892 * @param action The Runnable that will be executed. 10893 * @param delayMillis The delay (in milliseconds) until the Runnable 10894 * will be executed. 10895 * 10896 * @see #postOnAnimation 10897 * @see #removeCallbacks 10898 */ 10899 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10900 final AttachInfo attachInfo = mAttachInfo; 10901 if (attachInfo != null) { 10902 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10903 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10904 } else { 10905 // Assume that post will succeed later 10906 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10907 } 10908 } 10909 10910 /** 10911 * <p>Removes the specified Runnable from the message queue.</p> 10912 * 10913 * @param action The Runnable to remove from the message handling queue 10914 * 10915 * @return true if this view could ask the Handler to remove the Runnable, 10916 * false otherwise. When the returned value is true, the Runnable 10917 * may or may not have been actually removed from the message queue 10918 * (for instance, if the Runnable was not in the queue already.) 10919 * 10920 * @see #post 10921 * @see #postDelayed 10922 * @see #postOnAnimation 10923 * @see #postOnAnimationDelayed 10924 */ 10925 public boolean removeCallbacks(Runnable action) { 10926 if (action != null) { 10927 final AttachInfo attachInfo = mAttachInfo; 10928 if (attachInfo != null) { 10929 attachInfo.mHandler.removeCallbacks(action); 10930 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10931 Choreographer.CALLBACK_ANIMATION, action, null); 10932 } else { 10933 // Assume that post will succeed later 10934 ViewRootImpl.getRunQueue().removeCallbacks(action); 10935 } 10936 } 10937 return true; 10938 } 10939 10940 /** 10941 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10942 * Use this to invalidate the View from a non-UI thread.</p> 10943 * 10944 * <p>This method can be invoked from outside of the UI thread 10945 * only when this View is attached to a window.</p> 10946 * 10947 * @see #invalidate() 10948 * @see #postInvalidateDelayed(long) 10949 */ 10950 public void postInvalidate() { 10951 postInvalidateDelayed(0); 10952 } 10953 10954 /** 10955 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10956 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10957 * 10958 * <p>This method can be invoked from outside of the UI thread 10959 * only when this View is attached to a window.</p> 10960 * 10961 * @param left The left coordinate of the rectangle to invalidate. 10962 * @param top The top coordinate of the rectangle to invalidate. 10963 * @param right The right coordinate of the rectangle to invalidate. 10964 * @param bottom The bottom coordinate of the rectangle to invalidate. 10965 * 10966 * @see #invalidate(int, int, int, int) 10967 * @see #invalidate(Rect) 10968 * @see #postInvalidateDelayed(long, int, int, int, int) 10969 */ 10970 public void postInvalidate(int left, int top, int right, int bottom) { 10971 postInvalidateDelayed(0, left, top, right, bottom); 10972 } 10973 10974 /** 10975 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10976 * loop. Waits for the specified amount of time.</p> 10977 * 10978 * <p>This method can be invoked from outside of the UI thread 10979 * only when this View is attached to a window.</p> 10980 * 10981 * @param delayMilliseconds the duration in milliseconds to delay the 10982 * invalidation by 10983 * 10984 * @see #invalidate() 10985 * @see #postInvalidate() 10986 */ 10987 public void postInvalidateDelayed(long delayMilliseconds) { 10988 // We try only with the AttachInfo because there's no point in invalidating 10989 // if we are not attached to our window 10990 final AttachInfo attachInfo = mAttachInfo; 10991 if (attachInfo != null) { 10992 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10993 } 10994 } 10995 10996 /** 10997 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10998 * through the event loop. Waits for the specified amount of time.</p> 10999 * 11000 * <p>This method can be invoked from outside of the UI thread 11001 * only when this View is attached to a window.</p> 11002 * 11003 * @param delayMilliseconds the duration in milliseconds to delay the 11004 * invalidation by 11005 * @param left The left coordinate of the rectangle to invalidate. 11006 * @param top The top coordinate of the rectangle to invalidate. 11007 * @param right The right coordinate of the rectangle to invalidate. 11008 * @param bottom The bottom coordinate of the rectangle to invalidate. 11009 * 11010 * @see #invalidate(int, int, int, int) 11011 * @see #invalidate(Rect) 11012 * @see #postInvalidate(int, int, int, int) 11013 */ 11014 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 11015 int right, int bottom) { 11016 11017 // We try only with the AttachInfo because there's no point in invalidating 11018 // if we are not attached to our window 11019 final AttachInfo attachInfo = mAttachInfo; 11020 if (attachInfo != null) { 11021 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11022 info.target = this; 11023 info.left = left; 11024 info.top = top; 11025 info.right = right; 11026 info.bottom = bottom; 11027 11028 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 11029 } 11030 } 11031 11032 /** 11033 * <p>Cause an invalidate to happen on the next animation time step, typically the 11034 * next display frame.</p> 11035 * 11036 * <p>This method can be invoked from outside of the UI thread 11037 * only when this View is attached to a window.</p> 11038 * 11039 * @see #invalidate() 11040 */ 11041 public void postInvalidateOnAnimation() { 11042 // We try only with the AttachInfo because there's no point in invalidating 11043 // if we are not attached to our window 11044 final AttachInfo attachInfo = mAttachInfo; 11045 if (attachInfo != null) { 11046 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 11047 } 11048 } 11049 11050 /** 11051 * <p>Cause an invalidate of the specified area to happen on the next animation 11052 * time step, typically the next display frame.</p> 11053 * 11054 * <p>This method can be invoked from outside of the UI thread 11055 * only when this View is attached to a window.</p> 11056 * 11057 * @param left The left coordinate of the rectangle to invalidate. 11058 * @param top The top coordinate of the rectangle to invalidate. 11059 * @param right The right coordinate of the rectangle to invalidate. 11060 * @param bottom The bottom coordinate of the rectangle to invalidate. 11061 * 11062 * @see #invalidate(int, int, int, int) 11063 * @see #invalidate(Rect) 11064 */ 11065 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 11066 // We try only with the AttachInfo because there's no point in invalidating 11067 // if we are not attached to our window 11068 final AttachInfo attachInfo = mAttachInfo; 11069 if (attachInfo != null) { 11070 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11071 info.target = this; 11072 info.left = left; 11073 info.top = top; 11074 info.right = right; 11075 info.bottom = bottom; 11076 11077 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 11078 } 11079 } 11080 11081 /** 11082 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 11083 * This event is sent at most once every 11084 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 11085 */ 11086 private void postSendViewScrolledAccessibilityEventCallback() { 11087 if (mSendViewScrolledAccessibilityEvent == null) { 11088 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 11089 } 11090 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 11091 mSendViewScrolledAccessibilityEvent.mIsPending = true; 11092 postDelayed(mSendViewScrolledAccessibilityEvent, 11093 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 11094 } 11095 } 11096 11097 /** 11098 * Called by a parent to request that a child update its values for mScrollX 11099 * and mScrollY if necessary. This will typically be done if the child is 11100 * animating a scroll using a {@link android.widget.Scroller Scroller} 11101 * object. 11102 */ 11103 public void computeScroll() { 11104 } 11105 11106 /** 11107 * <p>Indicate whether the horizontal edges are faded when the view is 11108 * scrolled horizontally.</p> 11109 * 11110 * @return true if the horizontal edges should are faded on scroll, false 11111 * otherwise 11112 * 11113 * @see #setHorizontalFadingEdgeEnabled(boolean) 11114 * 11115 * @attr ref android.R.styleable#View_requiresFadingEdge 11116 */ 11117 public boolean isHorizontalFadingEdgeEnabled() { 11118 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 11119 } 11120 11121 /** 11122 * <p>Define whether the horizontal edges should be faded when this view 11123 * is scrolled horizontally.</p> 11124 * 11125 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 11126 * be faded when the view is scrolled 11127 * horizontally 11128 * 11129 * @see #isHorizontalFadingEdgeEnabled() 11130 * 11131 * @attr ref android.R.styleable#View_requiresFadingEdge 11132 */ 11133 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 11134 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 11135 if (horizontalFadingEdgeEnabled) { 11136 initScrollCache(); 11137 } 11138 11139 mViewFlags ^= FADING_EDGE_HORIZONTAL; 11140 } 11141 } 11142 11143 /** 11144 * <p>Indicate whether the vertical edges are faded when the view is 11145 * scrolled horizontally.</p> 11146 * 11147 * @return true if the vertical edges should are faded on scroll, false 11148 * otherwise 11149 * 11150 * @see #setVerticalFadingEdgeEnabled(boolean) 11151 * 11152 * @attr ref android.R.styleable#View_requiresFadingEdge 11153 */ 11154 public boolean isVerticalFadingEdgeEnabled() { 11155 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 11156 } 11157 11158 /** 11159 * <p>Define whether the vertical edges should be faded when this view 11160 * is scrolled vertically.</p> 11161 * 11162 * @param verticalFadingEdgeEnabled true if the vertical edges should 11163 * be faded when the view is scrolled 11164 * vertically 11165 * 11166 * @see #isVerticalFadingEdgeEnabled() 11167 * 11168 * @attr ref android.R.styleable#View_requiresFadingEdge 11169 */ 11170 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 11171 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 11172 if (verticalFadingEdgeEnabled) { 11173 initScrollCache(); 11174 } 11175 11176 mViewFlags ^= FADING_EDGE_VERTICAL; 11177 } 11178 } 11179 11180 /** 11181 * Returns the strength, or intensity, of the top faded edge. The strength is 11182 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11183 * returns 0.0 or 1.0 but no value in between. 11184 * 11185 * Subclasses should override this method to provide a smoother fade transition 11186 * when scrolling occurs. 11187 * 11188 * @return the intensity of the top fade as a float between 0.0f and 1.0f 11189 */ 11190 protected float getTopFadingEdgeStrength() { 11191 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 11192 } 11193 11194 /** 11195 * Returns the strength, or intensity, of the bottom faded edge. The strength is 11196 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11197 * returns 0.0 or 1.0 but no value in between. 11198 * 11199 * Subclasses should override this method to provide a smoother fade transition 11200 * when scrolling occurs. 11201 * 11202 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 11203 */ 11204 protected float getBottomFadingEdgeStrength() { 11205 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 11206 computeVerticalScrollRange() ? 1.0f : 0.0f; 11207 } 11208 11209 /** 11210 * Returns the strength, or intensity, of the left faded edge. The strength is 11211 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11212 * returns 0.0 or 1.0 but no value in between. 11213 * 11214 * Subclasses should override this method to provide a smoother fade transition 11215 * when scrolling occurs. 11216 * 11217 * @return the intensity of the left fade as a float between 0.0f and 1.0f 11218 */ 11219 protected float getLeftFadingEdgeStrength() { 11220 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 11221 } 11222 11223 /** 11224 * Returns the strength, or intensity, of the right faded edge. The strength is 11225 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11226 * returns 0.0 or 1.0 but no value in between. 11227 * 11228 * Subclasses should override this method to provide a smoother fade transition 11229 * when scrolling occurs. 11230 * 11231 * @return the intensity of the right fade as a float between 0.0f and 1.0f 11232 */ 11233 protected float getRightFadingEdgeStrength() { 11234 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 11235 computeHorizontalScrollRange() ? 1.0f : 0.0f; 11236 } 11237 11238 /** 11239 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 11240 * scrollbar is not drawn by default.</p> 11241 * 11242 * @return true if the horizontal scrollbar should be painted, false 11243 * otherwise 11244 * 11245 * @see #setHorizontalScrollBarEnabled(boolean) 11246 */ 11247 public boolean isHorizontalScrollBarEnabled() { 11248 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11249 } 11250 11251 /** 11252 * <p>Define whether the horizontal scrollbar should be drawn or not. The 11253 * scrollbar is not drawn by default.</p> 11254 * 11255 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 11256 * be painted 11257 * 11258 * @see #isHorizontalScrollBarEnabled() 11259 */ 11260 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 11261 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 11262 mViewFlags ^= SCROLLBARS_HORIZONTAL; 11263 computeOpaqueFlags(); 11264 resolvePadding(); 11265 } 11266 } 11267 11268 /** 11269 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 11270 * scrollbar is not drawn by default.</p> 11271 * 11272 * @return true if the vertical scrollbar should be painted, false 11273 * otherwise 11274 * 11275 * @see #setVerticalScrollBarEnabled(boolean) 11276 */ 11277 public boolean isVerticalScrollBarEnabled() { 11278 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 11279 } 11280 11281 /** 11282 * <p>Define whether the vertical scrollbar should be drawn or not. The 11283 * scrollbar is not drawn by default.</p> 11284 * 11285 * @param verticalScrollBarEnabled true if the vertical scrollbar should 11286 * be painted 11287 * 11288 * @see #isVerticalScrollBarEnabled() 11289 */ 11290 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 11291 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 11292 mViewFlags ^= SCROLLBARS_VERTICAL; 11293 computeOpaqueFlags(); 11294 resolvePadding(); 11295 } 11296 } 11297 11298 /** 11299 * @hide 11300 */ 11301 protected void recomputePadding() { 11302 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11303 } 11304 11305 /** 11306 * Define whether scrollbars will fade when the view is not scrolling. 11307 * 11308 * @param fadeScrollbars wheter to enable fading 11309 * 11310 * @attr ref android.R.styleable#View_fadeScrollbars 11311 */ 11312 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11313 initScrollCache(); 11314 final ScrollabilityCache scrollabilityCache = mScrollCache; 11315 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11316 if (fadeScrollbars) { 11317 scrollabilityCache.state = ScrollabilityCache.OFF; 11318 } else { 11319 scrollabilityCache.state = ScrollabilityCache.ON; 11320 } 11321 } 11322 11323 /** 11324 * 11325 * Returns true if scrollbars will fade when this view is not scrolling 11326 * 11327 * @return true if scrollbar fading is enabled 11328 * 11329 * @attr ref android.R.styleable#View_fadeScrollbars 11330 */ 11331 public boolean isScrollbarFadingEnabled() { 11332 return mScrollCache != null && mScrollCache.fadeScrollBars; 11333 } 11334 11335 /** 11336 * 11337 * Returns the delay before scrollbars fade. 11338 * 11339 * @return the delay before scrollbars fade 11340 * 11341 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11342 */ 11343 public int getScrollBarDefaultDelayBeforeFade() { 11344 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11345 mScrollCache.scrollBarDefaultDelayBeforeFade; 11346 } 11347 11348 /** 11349 * Define the delay before scrollbars fade. 11350 * 11351 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11352 * 11353 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11354 */ 11355 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11356 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11357 } 11358 11359 /** 11360 * 11361 * Returns the scrollbar fade duration. 11362 * 11363 * @return the scrollbar fade duration 11364 * 11365 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11366 */ 11367 public int getScrollBarFadeDuration() { 11368 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11369 mScrollCache.scrollBarFadeDuration; 11370 } 11371 11372 /** 11373 * Define the scrollbar fade duration. 11374 * 11375 * @param scrollBarFadeDuration - the scrollbar fade duration 11376 * 11377 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11378 */ 11379 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11380 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11381 } 11382 11383 /** 11384 * 11385 * Returns the scrollbar size. 11386 * 11387 * @return the scrollbar size 11388 * 11389 * @attr ref android.R.styleable#View_scrollbarSize 11390 */ 11391 public int getScrollBarSize() { 11392 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11393 mScrollCache.scrollBarSize; 11394 } 11395 11396 /** 11397 * Define the scrollbar size. 11398 * 11399 * @param scrollBarSize - the scrollbar size 11400 * 11401 * @attr ref android.R.styleable#View_scrollbarSize 11402 */ 11403 public void setScrollBarSize(int scrollBarSize) { 11404 getScrollCache().scrollBarSize = scrollBarSize; 11405 } 11406 11407 /** 11408 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11409 * inset. When inset, they add to the padding of the view. And the scrollbars 11410 * can be drawn inside the padding area or on the edge of the view. For example, 11411 * if a view has a background drawable and you want to draw the scrollbars 11412 * inside the padding specified by the drawable, you can use 11413 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11414 * appear at the edge of the view, ignoring the padding, then you can use 11415 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11416 * @param style the style of the scrollbars. Should be one of 11417 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11418 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11419 * @see #SCROLLBARS_INSIDE_OVERLAY 11420 * @see #SCROLLBARS_INSIDE_INSET 11421 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11422 * @see #SCROLLBARS_OUTSIDE_INSET 11423 * 11424 * @attr ref android.R.styleable#View_scrollbarStyle 11425 */ 11426 public void setScrollBarStyle(int style) { 11427 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11428 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11429 computeOpaqueFlags(); 11430 resolvePadding(); 11431 } 11432 } 11433 11434 /** 11435 * <p>Returns the current scrollbar style.</p> 11436 * @return the current scrollbar style 11437 * @see #SCROLLBARS_INSIDE_OVERLAY 11438 * @see #SCROLLBARS_INSIDE_INSET 11439 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11440 * @see #SCROLLBARS_OUTSIDE_INSET 11441 * 11442 * @attr ref android.R.styleable#View_scrollbarStyle 11443 */ 11444 @ViewDebug.ExportedProperty(mapping = { 11445 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11446 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11447 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11448 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11449 }) 11450 public int getScrollBarStyle() { 11451 return mViewFlags & SCROLLBARS_STYLE_MASK; 11452 } 11453 11454 /** 11455 * <p>Compute the horizontal range that the horizontal scrollbar 11456 * represents.</p> 11457 * 11458 * <p>The range is expressed in arbitrary units that must be the same as the 11459 * units used by {@link #computeHorizontalScrollExtent()} and 11460 * {@link #computeHorizontalScrollOffset()}.</p> 11461 * 11462 * <p>The default range is the drawing width of this view.</p> 11463 * 11464 * @return the total horizontal range represented by the horizontal 11465 * scrollbar 11466 * 11467 * @see #computeHorizontalScrollExtent() 11468 * @see #computeHorizontalScrollOffset() 11469 * @see android.widget.ScrollBarDrawable 11470 */ 11471 protected int computeHorizontalScrollRange() { 11472 return getWidth(); 11473 } 11474 11475 /** 11476 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11477 * within the horizontal range. This value is used to compute the position 11478 * of the thumb within the scrollbar's track.</p> 11479 * 11480 * <p>The range is expressed in arbitrary units that must be the same as the 11481 * units used by {@link #computeHorizontalScrollRange()} and 11482 * {@link #computeHorizontalScrollExtent()}.</p> 11483 * 11484 * <p>The default offset is the scroll offset of this view.</p> 11485 * 11486 * @return the horizontal offset of the scrollbar's thumb 11487 * 11488 * @see #computeHorizontalScrollRange() 11489 * @see #computeHorizontalScrollExtent() 11490 * @see android.widget.ScrollBarDrawable 11491 */ 11492 protected int computeHorizontalScrollOffset() { 11493 return mScrollX; 11494 } 11495 11496 /** 11497 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11498 * within the horizontal range. This value is used to compute the length 11499 * of the thumb within the scrollbar's track.</p> 11500 * 11501 * <p>The range is expressed in arbitrary units that must be the same as the 11502 * units used by {@link #computeHorizontalScrollRange()} and 11503 * {@link #computeHorizontalScrollOffset()}.</p> 11504 * 11505 * <p>The default extent is the drawing width of this view.</p> 11506 * 11507 * @return the horizontal extent of the scrollbar's thumb 11508 * 11509 * @see #computeHorizontalScrollRange() 11510 * @see #computeHorizontalScrollOffset() 11511 * @see android.widget.ScrollBarDrawable 11512 */ 11513 protected int computeHorizontalScrollExtent() { 11514 return getWidth(); 11515 } 11516 11517 /** 11518 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11519 * 11520 * <p>The range is expressed in arbitrary units that must be the same as the 11521 * units used by {@link #computeVerticalScrollExtent()} and 11522 * {@link #computeVerticalScrollOffset()}.</p> 11523 * 11524 * @return the total vertical range represented by the vertical scrollbar 11525 * 11526 * <p>The default range is the drawing height of this view.</p> 11527 * 11528 * @see #computeVerticalScrollExtent() 11529 * @see #computeVerticalScrollOffset() 11530 * @see android.widget.ScrollBarDrawable 11531 */ 11532 protected int computeVerticalScrollRange() { 11533 return getHeight(); 11534 } 11535 11536 /** 11537 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11538 * within the horizontal range. This value is used to compute the position 11539 * of the thumb within the scrollbar's track.</p> 11540 * 11541 * <p>The range is expressed in arbitrary units that must be the same as the 11542 * units used by {@link #computeVerticalScrollRange()} and 11543 * {@link #computeVerticalScrollExtent()}.</p> 11544 * 11545 * <p>The default offset is the scroll offset of this view.</p> 11546 * 11547 * @return the vertical offset of the scrollbar's thumb 11548 * 11549 * @see #computeVerticalScrollRange() 11550 * @see #computeVerticalScrollExtent() 11551 * @see android.widget.ScrollBarDrawable 11552 */ 11553 protected int computeVerticalScrollOffset() { 11554 return mScrollY; 11555 } 11556 11557 /** 11558 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11559 * within the vertical range. This value is used to compute the length 11560 * of the thumb within the scrollbar's track.</p> 11561 * 11562 * <p>The range is expressed in arbitrary units that must be the same as the 11563 * units used by {@link #computeVerticalScrollRange()} and 11564 * {@link #computeVerticalScrollOffset()}.</p> 11565 * 11566 * <p>The default extent is the drawing height of this view.</p> 11567 * 11568 * @return the vertical extent of the scrollbar's thumb 11569 * 11570 * @see #computeVerticalScrollRange() 11571 * @see #computeVerticalScrollOffset() 11572 * @see android.widget.ScrollBarDrawable 11573 */ 11574 protected int computeVerticalScrollExtent() { 11575 return getHeight(); 11576 } 11577 11578 /** 11579 * Check if this view can be scrolled horizontally in a certain direction. 11580 * 11581 * @param direction Negative to check scrolling left, positive to check scrolling right. 11582 * @return true if this view can be scrolled in the specified direction, false otherwise. 11583 */ 11584 public boolean canScrollHorizontally(int direction) { 11585 final int offset = computeHorizontalScrollOffset(); 11586 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11587 if (range == 0) return false; 11588 if (direction < 0) { 11589 return offset > 0; 11590 } else { 11591 return offset < range - 1; 11592 } 11593 } 11594 11595 /** 11596 * Check if this view can be scrolled vertically in a certain direction. 11597 * 11598 * @param direction Negative to check scrolling up, positive to check scrolling down. 11599 * @return true if this view can be scrolled in the specified direction, false otherwise. 11600 */ 11601 public boolean canScrollVertically(int direction) { 11602 final int offset = computeVerticalScrollOffset(); 11603 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11604 if (range == 0) return false; 11605 if (direction < 0) { 11606 return offset > 0; 11607 } else { 11608 return offset < range - 1; 11609 } 11610 } 11611 11612 /** 11613 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11614 * scrollbars are painted only if they have been awakened first.</p> 11615 * 11616 * @param canvas the canvas on which to draw the scrollbars 11617 * 11618 * @see #awakenScrollBars(int) 11619 */ 11620 protected final void onDrawScrollBars(Canvas canvas) { 11621 // scrollbars are drawn only when the animation is running 11622 final ScrollabilityCache cache = mScrollCache; 11623 if (cache != null) { 11624 11625 int state = cache.state; 11626 11627 if (state == ScrollabilityCache.OFF) { 11628 return; 11629 } 11630 11631 boolean invalidate = false; 11632 11633 if (state == ScrollabilityCache.FADING) { 11634 // We're fading -- get our fade interpolation 11635 if (cache.interpolatorValues == null) { 11636 cache.interpolatorValues = new float[1]; 11637 } 11638 11639 float[] values = cache.interpolatorValues; 11640 11641 // Stops the animation if we're done 11642 if (cache.scrollBarInterpolator.timeToValues(values) == 11643 Interpolator.Result.FREEZE_END) { 11644 cache.state = ScrollabilityCache.OFF; 11645 } else { 11646 cache.scrollBar.setAlpha(Math.round(values[0])); 11647 } 11648 11649 // This will make the scroll bars inval themselves after 11650 // drawing. We only want this when we're fading so that 11651 // we prevent excessive redraws 11652 invalidate = true; 11653 } else { 11654 // We're just on -- but we may have been fading before so 11655 // reset alpha 11656 cache.scrollBar.setAlpha(255); 11657 } 11658 11659 11660 final int viewFlags = mViewFlags; 11661 11662 final boolean drawHorizontalScrollBar = 11663 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11664 final boolean drawVerticalScrollBar = 11665 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11666 && !isVerticalScrollBarHidden(); 11667 11668 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11669 final int width = mRight - mLeft; 11670 final int height = mBottom - mTop; 11671 11672 final ScrollBarDrawable scrollBar = cache.scrollBar; 11673 11674 final int scrollX = mScrollX; 11675 final int scrollY = mScrollY; 11676 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11677 11678 int left; 11679 int top; 11680 int right; 11681 int bottom; 11682 11683 if (drawHorizontalScrollBar) { 11684 int size = scrollBar.getSize(false); 11685 if (size <= 0) { 11686 size = cache.scrollBarSize; 11687 } 11688 11689 scrollBar.setParameters(computeHorizontalScrollRange(), 11690 computeHorizontalScrollOffset(), 11691 computeHorizontalScrollExtent(), false); 11692 final int verticalScrollBarGap = drawVerticalScrollBar ? 11693 getVerticalScrollbarWidth() : 0; 11694 top = scrollY + height - size - (mUserPaddingBottom & inside); 11695 left = scrollX + (mPaddingLeft & inside); 11696 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11697 bottom = top + size; 11698 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11699 if (invalidate) { 11700 invalidate(left, top, right, bottom); 11701 } 11702 } 11703 11704 if (drawVerticalScrollBar) { 11705 int size = scrollBar.getSize(true); 11706 if (size <= 0) { 11707 size = cache.scrollBarSize; 11708 } 11709 11710 scrollBar.setParameters(computeVerticalScrollRange(), 11711 computeVerticalScrollOffset(), 11712 computeVerticalScrollExtent(), true); 11713 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11714 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11715 verticalScrollbarPosition = isLayoutRtl() ? 11716 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11717 } 11718 switch (verticalScrollbarPosition) { 11719 default: 11720 case SCROLLBAR_POSITION_RIGHT: 11721 left = scrollX + width - size - (mUserPaddingRight & inside); 11722 break; 11723 case SCROLLBAR_POSITION_LEFT: 11724 left = scrollX + (mUserPaddingLeft & inside); 11725 break; 11726 } 11727 top = scrollY + (mPaddingTop & inside); 11728 right = left + size; 11729 bottom = scrollY + height - (mUserPaddingBottom & inside); 11730 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11731 if (invalidate) { 11732 invalidate(left, top, right, bottom); 11733 } 11734 } 11735 } 11736 } 11737 } 11738 11739 /** 11740 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11741 * FastScroller is visible. 11742 * @return whether to temporarily hide the vertical scrollbar 11743 * @hide 11744 */ 11745 protected boolean isVerticalScrollBarHidden() { 11746 return false; 11747 } 11748 11749 /** 11750 * <p>Draw the horizontal scrollbar if 11751 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11752 * 11753 * @param canvas the canvas on which to draw the scrollbar 11754 * @param scrollBar the scrollbar's drawable 11755 * 11756 * @see #isHorizontalScrollBarEnabled() 11757 * @see #computeHorizontalScrollRange() 11758 * @see #computeHorizontalScrollExtent() 11759 * @see #computeHorizontalScrollOffset() 11760 * @see android.widget.ScrollBarDrawable 11761 * @hide 11762 */ 11763 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11764 int l, int t, int r, int b) { 11765 scrollBar.setBounds(l, t, r, b); 11766 scrollBar.draw(canvas); 11767 } 11768 11769 /** 11770 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11771 * returns true.</p> 11772 * 11773 * @param canvas the canvas on which to draw the scrollbar 11774 * @param scrollBar the scrollbar's drawable 11775 * 11776 * @see #isVerticalScrollBarEnabled() 11777 * @see #computeVerticalScrollRange() 11778 * @see #computeVerticalScrollExtent() 11779 * @see #computeVerticalScrollOffset() 11780 * @see android.widget.ScrollBarDrawable 11781 * @hide 11782 */ 11783 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11784 int l, int t, int r, int b) { 11785 scrollBar.setBounds(l, t, r, b); 11786 scrollBar.draw(canvas); 11787 } 11788 11789 /** 11790 * Implement this to do your drawing. 11791 * 11792 * @param canvas the canvas on which the background will be drawn 11793 */ 11794 protected void onDraw(Canvas canvas) { 11795 } 11796 11797 /* 11798 * Caller is responsible for calling requestLayout if necessary. 11799 * (This allows addViewInLayout to not request a new layout.) 11800 */ 11801 void assignParent(ViewParent parent) { 11802 if (mParent == null) { 11803 mParent = parent; 11804 } else if (parent == null) { 11805 mParent = null; 11806 } else { 11807 throw new RuntimeException("view " + this + " being added, but" 11808 + " it already has a parent"); 11809 } 11810 } 11811 11812 /** 11813 * This is called when the view is attached to a window. At this point it 11814 * has a Surface and will start drawing. Note that this function is 11815 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11816 * however it may be called any time before the first onDraw -- including 11817 * before or after {@link #onMeasure(int, int)}. 11818 * 11819 * @see #onDetachedFromWindow() 11820 */ 11821 protected void onAttachedToWindow() { 11822 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 11823 mParent.requestTransparentRegion(this); 11824 } 11825 11826 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11827 initialAwakenScrollBars(); 11828 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 11829 } 11830 11831 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 11832 11833 jumpDrawablesToCurrentState(); 11834 11835 clearAccessibilityFocus(); 11836 resetSubtreeAccessibilityStateChanged(); 11837 11838 if (isFocused()) { 11839 InputMethodManager imm = InputMethodManager.peekInstance(); 11840 imm.focusIn(this); 11841 } 11842 11843 if (mDisplayList != null) { 11844 mDisplayList.clearDirty(); 11845 } 11846 } 11847 11848 /** 11849 * Resolve all RTL related properties. 11850 * 11851 * @return true if resolution of RTL properties has been done 11852 * 11853 * @hide 11854 */ 11855 public boolean resolveRtlPropertiesIfNeeded() { 11856 if (!needRtlPropertiesResolution()) return false; 11857 11858 // Order is important here: LayoutDirection MUST be resolved first 11859 if (!isLayoutDirectionResolved()) { 11860 resolveLayoutDirection(); 11861 resolveLayoutParams(); 11862 } 11863 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 11864 if (!isTextDirectionResolved()) { 11865 resolveTextDirection(); 11866 } 11867 if (!isTextAlignmentResolved()) { 11868 resolveTextAlignment(); 11869 } 11870 if (!isPaddingResolved()) { 11871 resolvePadding(); 11872 } 11873 if (!isDrawablesResolved()) { 11874 resolveDrawables(); 11875 } 11876 onRtlPropertiesChanged(getLayoutDirection()); 11877 return true; 11878 } 11879 11880 /** 11881 * Reset resolution of all RTL related properties. 11882 * 11883 * @hide 11884 */ 11885 public void resetRtlProperties() { 11886 resetResolvedLayoutDirection(); 11887 resetResolvedTextDirection(); 11888 resetResolvedTextAlignment(); 11889 resetResolvedPadding(); 11890 resetResolvedDrawables(); 11891 } 11892 11893 /** 11894 * @see #onScreenStateChanged(int) 11895 */ 11896 void dispatchScreenStateChanged(int screenState) { 11897 onScreenStateChanged(screenState); 11898 } 11899 11900 /** 11901 * This method is called whenever the state of the screen this view is 11902 * attached to changes. A state change will usually occurs when the screen 11903 * turns on or off (whether it happens automatically or the user does it 11904 * manually.) 11905 * 11906 * @param screenState The new state of the screen. Can be either 11907 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11908 */ 11909 public void onScreenStateChanged(int screenState) { 11910 } 11911 11912 /** 11913 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11914 */ 11915 private boolean hasRtlSupport() { 11916 return mContext.getApplicationInfo().hasRtlSupport(); 11917 } 11918 11919 /** 11920 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 11921 * RTL not supported) 11922 */ 11923 private boolean isRtlCompatibilityMode() { 11924 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 11925 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 11926 } 11927 11928 /** 11929 * @return true if RTL properties need resolution. 11930 * 11931 */ 11932 private boolean needRtlPropertiesResolution() { 11933 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 11934 } 11935 11936 /** 11937 * Called when any RTL property (layout direction or text direction or text alignment) has 11938 * been changed. 11939 * 11940 * Subclasses need to override this method to take care of cached information that depends on the 11941 * resolved layout direction, or to inform child views that inherit their layout direction. 11942 * 11943 * The default implementation does nothing. 11944 * 11945 * @param layoutDirection the direction of the layout 11946 * 11947 * @see #LAYOUT_DIRECTION_LTR 11948 * @see #LAYOUT_DIRECTION_RTL 11949 */ 11950 public void onRtlPropertiesChanged(int layoutDirection) { 11951 } 11952 11953 /** 11954 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11955 * that the parent directionality can and will be resolved before its children. 11956 * 11957 * @return true if resolution has been done, false otherwise. 11958 * 11959 * @hide 11960 */ 11961 public boolean resolveLayoutDirection() { 11962 // Clear any previous layout direction resolution 11963 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11964 11965 if (hasRtlSupport()) { 11966 // Set resolved depending on layout direction 11967 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 11968 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 11969 case LAYOUT_DIRECTION_INHERIT: 11970 // We cannot resolve yet. LTR is by default and let the resolution happen again 11971 // later to get the correct resolved value 11972 if (!canResolveLayoutDirection()) return false; 11973 11974 // Parent has not yet resolved, LTR is still the default 11975 try { 11976 if (!mParent.isLayoutDirectionResolved()) return false; 11977 11978 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11979 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11980 } 11981 } catch (AbstractMethodError e) { 11982 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 11983 " does not fully implement ViewParent", e); 11984 } 11985 break; 11986 case LAYOUT_DIRECTION_RTL: 11987 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11988 break; 11989 case LAYOUT_DIRECTION_LOCALE: 11990 if((LAYOUT_DIRECTION_RTL == 11991 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 11992 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11993 } 11994 break; 11995 default: 11996 // Nothing to do, LTR by default 11997 } 11998 } 11999 12000 // Set to resolved 12001 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 12002 return true; 12003 } 12004 12005 /** 12006 * Check if layout direction resolution can be done. 12007 * 12008 * @return true if layout direction resolution can be done otherwise return false. 12009 */ 12010 public boolean canResolveLayoutDirection() { 12011 switch (getRawLayoutDirection()) { 12012 case LAYOUT_DIRECTION_INHERIT: 12013 if (mParent != null) { 12014 try { 12015 return mParent.canResolveLayoutDirection(); 12016 } catch (AbstractMethodError e) { 12017 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 12018 " does not fully implement ViewParent", e); 12019 } 12020 } 12021 return false; 12022 12023 default: 12024 return true; 12025 } 12026 } 12027 12028 /** 12029 * Reset the resolved layout direction. Layout direction will be resolved during a call to 12030 * {@link #onMeasure(int, int)}. 12031 * 12032 * @hide 12033 */ 12034 public void resetResolvedLayoutDirection() { 12035 // Reset the current resolved bits 12036 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 12037 } 12038 12039 /** 12040 * @return true if the layout direction is inherited. 12041 * 12042 * @hide 12043 */ 12044 public boolean isLayoutDirectionInherited() { 12045 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 12046 } 12047 12048 /** 12049 * @return true if layout direction has been resolved. 12050 */ 12051 public boolean isLayoutDirectionResolved() { 12052 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 12053 } 12054 12055 /** 12056 * Return if padding has been resolved 12057 * 12058 * @hide 12059 */ 12060 boolean isPaddingResolved() { 12061 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 12062 } 12063 12064 /** 12065 * Resolve padding depending on layout direction. 12066 * 12067 * @hide 12068 */ 12069 public void resolvePadding() { 12070 if (!isRtlCompatibilityMode()) { 12071 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 12072 // If start / end padding are defined, they will be resolved (hence overriding) to 12073 // left / right or right / left depending on the resolved layout direction. 12074 // If start / end padding are not defined, use the left / right ones. 12075 int resolvedLayoutDirection = getLayoutDirection(); 12076 switch (resolvedLayoutDirection) { 12077 case LAYOUT_DIRECTION_RTL: 12078 if (mUserPaddingStart != UNDEFINED_PADDING) { 12079 mUserPaddingRight = mUserPaddingStart; 12080 } else { 12081 mUserPaddingRight = mUserPaddingRightInitial; 12082 } 12083 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12084 mUserPaddingLeft = mUserPaddingEnd; 12085 } else { 12086 mUserPaddingLeft = mUserPaddingLeftInitial; 12087 } 12088 break; 12089 case LAYOUT_DIRECTION_LTR: 12090 default: 12091 if (mUserPaddingStart != UNDEFINED_PADDING) { 12092 mUserPaddingLeft = mUserPaddingStart; 12093 } else { 12094 mUserPaddingLeft = mUserPaddingLeftInitial; 12095 } 12096 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12097 mUserPaddingRight = mUserPaddingEnd; 12098 } else { 12099 mUserPaddingRight = mUserPaddingRightInitial; 12100 } 12101 } 12102 12103 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 12104 12105 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, 12106 mUserPaddingBottom); 12107 onRtlPropertiesChanged(resolvedLayoutDirection); 12108 } 12109 12110 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 12111 } 12112 12113 /** 12114 * Reset the resolved layout direction. 12115 * 12116 * @hide 12117 */ 12118 public void resetResolvedPadding() { 12119 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 12120 } 12121 12122 /** 12123 * This is called when the view is detached from a window. At this point it 12124 * no longer has a surface for drawing. 12125 * 12126 * @see #onAttachedToWindow() 12127 */ 12128 protected void onDetachedFromWindow() { 12129 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 12130 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 12131 12132 removeUnsetPressCallback(); 12133 removeLongPressCallback(); 12134 removePerformClickCallback(); 12135 removeSendViewScrolledAccessibilityEventCallback(); 12136 12137 destroyDrawingCache(); 12138 12139 destroyLayer(false); 12140 12141 cleanupDraw(); 12142 12143 mCurrentAnimation = null; 12144 mCurrentScene = null; 12145 } 12146 12147 private void cleanupDraw() { 12148 if (mAttachInfo != null) { 12149 if (mDisplayList != null) { 12150 mDisplayList.markDirty(); 12151 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 12152 } 12153 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 12154 } else { 12155 // Should never happen 12156 clearDisplayList(); 12157 } 12158 } 12159 12160 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 12161 } 12162 12163 /** 12164 * @return The number of times this view has been attached to a window 12165 */ 12166 protected int getWindowAttachCount() { 12167 return mWindowAttachCount; 12168 } 12169 12170 /** 12171 * Retrieve a unique token identifying the window this view is attached to. 12172 * @return Return the window's token for use in 12173 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 12174 */ 12175 public IBinder getWindowToken() { 12176 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 12177 } 12178 12179 /** 12180 * Retrieve the {@link WindowId} for the window this view is 12181 * currently attached to. 12182 */ 12183 public WindowId getWindowId() { 12184 if (mAttachInfo == null) { 12185 return null; 12186 } 12187 if (mAttachInfo.mWindowId == null) { 12188 try { 12189 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 12190 mAttachInfo.mWindowToken); 12191 mAttachInfo.mWindowId = new WindowId( 12192 mAttachInfo.mIWindowId); 12193 } catch (RemoteException e) { 12194 } 12195 } 12196 return mAttachInfo.mWindowId; 12197 } 12198 12199 /** 12200 * Retrieve a unique token identifying the top-level "real" window of 12201 * the window that this view is attached to. That is, this is like 12202 * {@link #getWindowToken}, except if the window this view in is a panel 12203 * window (attached to another containing window), then the token of 12204 * the containing window is returned instead. 12205 * 12206 * @return Returns the associated window token, either 12207 * {@link #getWindowToken()} or the containing window's token. 12208 */ 12209 public IBinder getApplicationWindowToken() { 12210 AttachInfo ai = mAttachInfo; 12211 if (ai != null) { 12212 IBinder appWindowToken = ai.mPanelParentWindowToken; 12213 if (appWindowToken == null) { 12214 appWindowToken = ai.mWindowToken; 12215 } 12216 return appWindowToken; 12217 } 12218 return null; 12219 } 12220 12221 /** 12222 * Gets the logical display to which the view's window has been attached. 12223 * 12224 * @return The logical display, or null if the view is not currently attached to a window. 12225 */ 12226 public Display getDisplay() { 12227 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 12228 } 12229 12230 /** 12231 * Retrieve private session object this view hierarchy is using to 12232 * communicate with the window manager. 12233 * @return the session object to communicate with the window manager 12234 */ 12235 /*package*/ IWindowSession getWindowSession() { 12236 return mAttachInfo != null ? mAttachInfo.mSession : null; 12237 } 12238 12239 /** 12240 * @param info the {@link android.view.View.AttachInfo} to associated with 12241 * this view 12242 */ 12243 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 12244 //System.out.println("Attached! " + this); 12245 mAttachInfo = info; 12246 if (mOverlay != null) { 12247 mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); 12248 } 12249 mWindowAttachCount++; 12250 // We will need to evaluate the drawable state at least once. 12251 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 12252 if (mFloatingTreeObserver != null) { 12253 info.mTreeObserver.merge(mFloatingTreeObserver); 12254 mFloatingTreeObserver = null; 12255 } 12256 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 12257 mAttachInfo.mScrollContainers.add(this); 12258 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 12259 } 12260 performCollectViewAttributes(mAttachInfo, visibility); 12261 onAttachedToWindow(); 12262 12263 ListenerInfo li = mListenerInfo; 12264 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12265 li != null ? li.mOnAttachStateChangeListeners : null; 12266 if (listeners != null && listeners.size() > 0) { 12267 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12268 // perform the dispatching. The iterator is a safe guard against listeners that 12269 // could mutate the list by calling the various add/remove methods. This prevents 12270 // the array from being modified while we iterate it. 12271 for (OnAttachStateChangeListener listener : listeners) { 12272 listener.onViewAttachedToWindow(this); 12273 } 12274 } 12275 12276 int vis = info.mWindowVisibility; 12277 if (vis != GONE) { 12278 onWindowVisibilityChanged(vis); 12279 } 12280 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 12281 // If nobody has evaluated the drawable state yet, then do it now. 12282 refreshDrawableState(); 12283 } 12284 needGlobalAttributesUpdate(false); 12285 } 12286 12287 void dispatchDetachedFromWindow() { 12288 AttachInfo info = mAttachInfo; 12289 if (info != null) { 12290 int vis = info.mWindowVisibility; 12291 if (vis != GONE) { 12292 onWindowVisibilityChanged(GONE); 12293 } 12294 } 12295 12296 onDetachedFromWindow(); 12297 12298 ListenerInfo li = mListenerInfo; 12299 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12300 li != null ? li.mOnAttachStateChangeListeners : null; 12301 if (listeners != null && listeners.size() > 0) { 12302 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12303 // perform the dispatching. The iterator is a safe guard against listeners that 12304 // could mutate the list by calling the various add/remove methods. This prevents 12305 // the array from being modified while we iterate it. 12306 for (OnAttachStateChangeListener listener : listeners) { 12307 listener.onViewDetachedFromWindow(this); 12308 } 12309 } 12310 12311 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 12312 mAttachInfo.mScrollContainers.remove(this); 12313 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 12314 } 12315 12316 mAttachInfo = null; 12317 if (mOverlay != null) { 12318 mOverlay.getOverlayView().dispatchDetachedFromWindow(); 12319 } 12320 } 12321 12322 /** 12323 * Store this view hierarchy's frozen state into the given container. 12324 * 12325 * @param container The SparseArray in which to save the view's state. 12326 * 12327 * @see #restoreHierarchyState(android.util.SparseArray) 12328 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12329 * @see #onSaveInstanceState() 12330 */ 12331 public void saveHierarchyState(SparseArray<Parcelable> container) { 12332 dispatchSaveInstanceState(container); 12333 } 12334 12335 /** 12336 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 12337 * this view and its children. May be overridden to modify how freezing happens to a 12338 * view's children; for example, some views may want to not store state for their children. 12339 * 12340 * @param container The SparseArray in which to save the view's state. 12341 * 12342 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12343 * @see #saveHierarchyState(android.util.SparseArray) 12344 * @see #onSaveInstanceState() 12345 */ 12346 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 12347 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 12348 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12349 Parcelable state = onSaveInstanceState(); 12350 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12351 throw new IllegalStateException( 12352 "Derived class did not call super.onSaveInstanceState()"); 12353 } 12354 if (state != null) { 12355 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12356 // + ": " + state); 12357 container.put(mID, state); 12358 } 12359 } 12360 } 12361 12362 /** 12363 * Hook allowing a view to generate a representation of its internal state 12364 * that can later be used to create a new instance with that same state. 12365 * This state should only contain information that is not persistent or can 12366 * not be reconstructed later. For example, you will never store your 12367 * current position on screen because that will be computed again when a 12368 * new instance of the view is placed in its view hierarchy. 12369 * <p> 12370 * Some examples of things you may store here: the current cursor position 12371 * in a text view (but usually not the text itself since that is stored in a 12372 * content provider or other persistent storage), the currently selected 12373 * item in a list view. 12374 * 12375 * @return Returns a Parcelable object containing the view's current dynamic 12376 * state, or null if there is nothing interesting to save. The 12377 * default implementation returns null. 12378 * @see #onRestoreInstanceState(android.os.Parcelable) 12379 * @see #saveHierarchyState(android.util.SparseArray) 12380 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12381 * @see #setSaveEnabled(boolean) 12382 */ 12383 protected Parcelable onSaveInstanceState() { 12384 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12385 return BaseSavedState.EMPTY_STATE; 12386 } 12387 12388 /** 12389 * Restore this view hierarchy's frozen state from the given container. 12390 * 12391 * @param container The SparseArray which holds previously frozen states. 12392 * 12393 * @see #saveHierarchyState(android.util.SparseArray) 12394 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12395 * @see #onRestoreInstanceState(android.os.Parcelable) 12396 */ 12397 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12398 dispatchRestoreInstanceState(container); 12399 } 12400 12401 /** 12402 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12403 * state for this view and its children. May be overridden to modify how restoring 12404 * happens to a view's children; for example, some views may want to not store state 12405 * for their children. 12406 * 12407 * @param container The SparseArray which holds previously saved state. 12408 * 12409 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12410 * @see #restoreHierarchyState(android.util.SparseArray) 12411 * @see #onRestoreInstanceState(android.os.Parcelable) 12412 */ 12413 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12414 if (mID != NO_ID) { 12415 Parcelable state = container.get(mID); 12416 if (state != null) { 12417 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12418 // + ": " + state); 12419 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12420 onRestoreInstanceState(state); 12421 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12422 throw new IllegalStateException( 12423 "Derived class did not call super.onRestoreInstanceState()"); 12424 } 12425 } 12426 } 12427 } 12428 12429 /** 12430 * Hook allowing a view to re-apply a representation of its internal state that had previously 12431 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12432 * null state. 12433 * 12434 * @param state The frozen state that had previously been returned by 12435 * {@link #onSaveInstanceState}. 12436 * 12437 * @see #onSaveInstanceState() 12438 * @see #restoreHierarchyState(android.util.SparseArray) 12439 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12440 */ 12441 protected void onRestoreInstanceState(Parcelable state) { 12442 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12443 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12444 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12445 + "received " + state.getClass().toString() + " instead. This usually happens " 12446 + "when two views of different type have the same id in the same hierarchy. " 12447 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12448 + "other views do not use the same id."); 12449 } 12450 } 12451 12452 /** 12453 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12454 * 12455 * @return the drawing start time in milliseconds 12456 */ 12457 public long getDrawingTime() { 12458 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12459 } 12460 12461 /** 12462 * <p>Enables or disables the duplication of the parent's state into this view. When 12463 * duplication is enabled, this view gets its drawable state from its parent rather 12464 * than from its own internal properties.</p> 12465 * 12466 * <p>Note: in the current implementation, setting this property to true after the 12467 * view was added to a ViewGroup might have no effect at all. This property should 12468 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12469 * 12470 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12471 * property is enabled, an exception will be thrown.</p> 12472 * 12473 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12474 * parent, these states should not be affected by this method.</p> 12475 * 12476 * @param enabled True to enable duplication of the parent's drawable state, false 12477 * to disable it. 12478 * 12479 * @see #getDrawableState() 12480 * @see #isDuplicateParentStateEnabled() 12481 */ 12482 public void setDuplicateParentStateEnabled(boolean enabled) { 12483 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12484 } 12485 12486 /** 12487 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12488 * 12489 * @return True if this view's drawable state is duplicated from the parent, 12490 * false otherwise 12491 * 12492 * @see #getDrawableState() 12493 * @see #setDuplicateParentStateEnabled(boolean) 12494 */ 12495 public boolean isDuplicateParentStateEnabled() { 12496 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12497 } 12498 12499 /** 12500 * <p>Specifies the type of layer backing this view. The layer can be 12501 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12502 * {@link #LAYER_TYPE_HARDWARE}.</p> 12503 * 12504 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12505 * instance that controls how the layer is composed on screen. The following 12506 * properties of the paint are taken into account when composing the layer:</p> 12507 * <ul> 12508 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12509 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12510 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12511 * </ul> 12512 * 12513 * <p>If this view has an alpha value set to < 1.0 by calling 12514 * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded 12515 * by this view's alpha value.</p> 12516 * 12517 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE}, 12518 * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} 12519 * for more information on when and how to use layers.</p> 12520 * 12521 * @param layerType The type of layer to use with this view, must be one of 12522 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12523 * {@link #LAYER_TYPE_HARDWARE} 12524 * @param paint The paint used to compose the layer. This argument is optional 12525 * and can be null. It is ignored when the layer type is 12526 * {@link #LAYER_TYPE_NONE} 12527 * 12528 * @see #getLayerType() 12529 * @see #LAYER_TYPE_NONE 12530 * @see #LAYER_TYPE_SOFTWARE 12531 * @see #LAYER_TYPE_HARDWARE 12532 * @see #setAlpha(float) 12533 * 12534 * @attr ref android.R.styleable#View_layerType 12535 */ 12536 public void setLayerType(int layerType, Paint paint) { 12537 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12538 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12539 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12540 } 12541 12542 if (layerType == mLayerType) { 12543 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12544 mLayerPaint = paint == null ? new Paint() : paint; 12545 invalidateParentCaches(); 12546 invalidate(true); 12547 } 12548 return; 12549 } 12550 12551 // Destroy any previous software drawing cache if needed 12552 switch (mLayerType) { 12553 case LAYER_TYPE_HARDWARE: 12554 destroyLayer(false); 12555 // fall through - non-accelerated views may use software layer mechanism instead 12556 case LAYER_TYPE_SOFTWARE: 12557 destroyDrawingCache(); 12558 break; 12559 default: 12560 break; 12561 } 12562 12563 mLayerType = layerType; 12564 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12565 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12566 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12567 12568 invalidateParentCaches(); 12569 invalidate(true); 12570 } 12571 12572 /** 12573 * Updates the {@link Paint} object used with the current layer (used only if the current 12574 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12575 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12576 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12577 * ensure that the view gets redrawn immediately. 12578 * 12579 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12580 * instance that controls how the layer is composed on screen. The following 12581 * properties of the paint are taken into account when composing the layer:</p> 12582 * <ul> 12583 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12584 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12585 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12586 * </ul> 12587 * 12588 * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the 12589 * alpha value of the layer's paint is superceded by this view's alpha value.</p> 12590 * 12591 * @param paint The paint used to compose the layer. This argument is optional 12592 * and can be null. It is ignored when the layer type is 12593 * {@link #LAYER_TYPE_NONE} 12594 * 12595 * @see #setLayerType(int, android.graphics.Paint) 12596 */ 12597 public void setLayerPaint(Paint paint) { 12598 int layerType = getLayerType(); 12599 if (layerType != LAYER_TYPE_NONE) { 12600 mLayerPaint = paint == null ? new Paint() : paint; 12601 if (layerType == LAYER_TYPE_HARDWARE) { 12602 HardwareLayer layer = getHardwareLayer(); 12603 if (layer != null) { 12604 layer.setLayerPaint(paint); 12605 } 12606 invalidateViewProperty(false, false); 12607 } else { 12608 invalidate(); 12609 } 12610 } 12611 } 12612 12613 /** 12614 * Indicates whether this view has a static layer. A view with layer type 12615 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12616 * dynamic. 12617 */ 12618 boolean hasStaticLayer() { 12619 return true; 12620 } 12621 12622 /** 12623 * Indicates what type of layer is currently associated with this view. By default 12624 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12625 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12626 * for more information on the different types of layers. 12627 * 12628 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12629 * {@link #LAYER_TYPE_HARDWARE} 12630 * 12631 * @see #setLayerType(int, android.graphics.Paint) 12632 * @see #buildLayer() 12633 * @see #LAYER_TYPE_NONE 12634 * @see #LAYER_TYPE_SOFTWARE 12635 * @see #LAYER_TYPE_HARDWARE 12636 */ 12637 public int getLayerType() { 12638 return mLayerType; 12639 } 12640 12641 /** 12642 * Forces this view's layer to be created and this view to be rendered 12643 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 12644 * invoking this method will have no effect. 12645 * 12646 * This method can for instance be used to render a view into its layer before 12647 * starting an animation. If this view is complex, rendering into the layer 12648 * before starting the animation will avoid skipping frames. 12649 * 12650 * @throws IllegalStateException If this view is not attached to a window 12651 * 12652 * @see #setLayerType(int, android.graphics.Paint) 12653 */ 12654 public void buildLayer() { 12655 if (mLayerType == LAYER_TYPE_NONE) return; 12656 12657 final AttachInfo attachInfo = mAttachInfo; 12658 if (attachInfo == null) { 12659 throw new IllegalStateException("This view must be attached to a window first"); 12660 } 12661 12662 switch (mLayerType) { 12663 case LAYER_TYPE_HARDWARE: 12664 if (attachInfo.mHardwareRenderer != null && 12665 attachInfo.mHardwareRenderer.isEnabled() && 12666 attachInfo.mHardwareRenderer.validate()) { 12667 getHardwareLayer(); 12668 // TODO: We need a better way to handle this case 12669 // If views have registered pre-draw listeners they need 12670 // to be notified before we build the layer. Those listeners 12671 // may however rely on other events to happen first so we 12672 // cannot just invoke them here until they don't cancel the 12673 // current frame 12674 if (!attachInfo.mTreeObserver.hasOnPreDrawListeners()) { 12675 attachInfo.mViewRootImpl.dispatchFlushHardwareLayerUpdates(); 12676 } 12677 } 12678 break; 12679 case LAYER_TYPE_SOFTWARE: 12680 buildDrawingCache(true); 12681 break; 12682 } 12683 } 12684 12685 /** 12686 * <p>Returns a hardware layer that can be used to draw this view again 12687 * without executing its draw method.</p> 12688 * 12689 * @return A HardwareLayer ready to render, or null if an error occurred. 12690 */ 12691 HardwareLayer getHardwareLayer() { 12692 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 12693 !mAttachInfo.mHardwareRenderer.isEnabled()) { 12694 return null; 12695 } 12696 12697 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 12698 12699 final int width = mRight - mLeft; 12700 final int height = mBottom - mTop; 12701 12702 if (width == 0 || height == 0) { 12703 return null; 12704 } 12705 12706 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 12707 if (mHardwareLayer == null) { 12708 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 12709 width, height, isOpaque()); 12710 mLocalDirtyRect.set(0, 0, width, height); 12711 } else { 12712 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 12713 if (mHardwareLayer.resize(width, height)) { 12714 mLocalDirtyRect.set(0, 0, width, height); 12715 } 12716 } 12717 12718 // This should not be necessary but applications that change 12719 // the parameters of their background drawable without calling 12720 // this.setBackground(Drawable) can leave the view in a bad state 12721 // (for instance isOpaque() returns true, but the background is 12722 // not opaque.) 12723 computeOpaqueFlags(); 12724 12725 final boolean opaque = isOpaque(); 12726 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 12727 mHardwareLayer.setOpaque(opaque); 12728 mLocalDirtyRect.set(0, 0, width, height); 12729 } 12730 } 12731 12732 // The layer is not valid if the underlying GPU resources cannot be allocated 12733 if (!mHardwareLayer.isValid()) { 12734 return null; 12735 } 12736 12737 mHardwareLayer.setLayerPaint(mLayerPaint); 12738 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 12739 ViewRootImpl viewRoot = getViewRootImpl(); 12740 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 12741 12742 mLocalDirtyRect.setEmpty(); 12743 } 12744 12745 return mHardwareLayer; 12746 } 12747 12748 /** 12749 * Destroys this View's hardware layer if possible. 12750 * 12751 * @return True if the layer was destroyed, false otherwise. 12752 * 12753 * @see #setLayerType(int, android.graphics.Paint) 12754 * @see #LAYER_TYPE_HARDWARE 12755 */ 12756 boolean destroyLayer(boolean valid) { 12757 if (mHardwareLayer != null) { 12758 AttachInfo info = mAttachInfo; 12759 if (info != null && info.mHardwareRenderer != null && 12760 info.mHardwareRenderer.isEnabled() && 12761 (valid || info.mHardwareRenderer.validate())) { 12762 12763 info.mHardwareRenderer.cancelLayerUpdate(mHardwareLayer); 12764 mHardwareLayer.destroy(); 12765 mHardwareLayer = null; 12766 12767 if (mDisplayList != null) { 12768 mDisplayList.reset(); 12769 } 12770 invalidate(true); 12771 invalidateParentCaches(); 12772 } 12773 return true; 12774 } 12775 return false; 12776 } 12777 12778 /** 12779 * Destroys all hardware rendering resources. This method is invoked 12780 * when the system needs to reclaim resources. Upon execution of this 12781 * method, you should free any OpenGL resources created by the view. 12782 * 12783 * Note: you <strong>must</strong> call 12784 * <code>super.destroyHardwareResources()</code> when overriding 12785 * this method. 12786 * 12787 * @hide 12788 */ 12789 protected void destroyHardwareResources() { 12790 clearDisplayList(); 12791 destroyLayer(true); 12792 } 12793 12794 /** 12795 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12796 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12797 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12798 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12799 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12800 * null.</p> 12801 * 12802 * <p>Enabling the drawing cache is similar to 12803 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12804 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12805 * drawing cache has no effect on rendering because the system uses a different mechanism 12806 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12807 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12808 * for information on how to enable software and hardware layers.</p> 12809 * 12810 * <p>This API can be used to manually generate 12811 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12812 * {@link #getDrawingCache()}.</p> 12813 * 12814 * @param enabled true to enable the drawing cache, false otherwise 12815 * 12816 * @see #isDrawingCacheEnabled() 12817 * @see #getDrawingCache() 12818 * @see #buildDrawingCache() 12819 * @see #setLayerType(int, android.graphics.Paint) 12820 */ 12821 public void setDrawingCacheEnabled(boolean enabled) { 12822 mCachingFailed = false; 12823 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12824 } 12825 12826 /** 12827 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12828 * 12829 * @return true if the drawing cache is enabled 12830 * 12831 * @see #setDrawingCacheEnabled(boolean) 12832 * @see #getDrawingCache() 12833 */ 12834 @ViewDebug.ExportedProperty(category = "drawing") 12835 public boolean isDrawingCacheEnabled() { 12836 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12837 } 12838 12839 /** 12840 * Debugging utility which recursively outputs the dirty state of a view and its 12841 * descendants. 12842 * 12843 * @hide 12844 */ 12845 @SuppressWarnings({"UnusedDeclaration"}) 12846 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12847 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 12848 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 12849 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 12850 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 12851 if (clear) { 12852 mPrivateFlags &= clearMask; 12853 } 12854 if (this instanceof ViewGroup) { 12855 ViewGroup parent = (ViewGroup) this; 12856 final int count = parent.getChildCount(); 12857 for (int i = 0; i < count; i++) { 12858 final View child = parent.getChildAt(i); 12859 child.outputDirtyFlags(indent + " ", clear, clearMask); 12860 } 12861 } 12862 } 12863 12864 /** 12865 * This method is used by ViewGroup to cause its children to restore or recreate their 12866 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12867 * to recreate its own display list, which would happen if it went through the normal 12868 * draw/dispatchDraw mechanisms. 12869 * 12870 * @hide 12871 */ 12872 protected void dispatchGetDisplayList() {} 12873 12874 /** 12875 * A view that is not attached or hardware accelerated cannot create a display list. 12876 * This method checks these conditions and returns the appropriate result. 12877 * 12878 * @return true if view has the ability to create a display list, false otherwise. 12879 * 12880 * @hide 12881 */ 12882 public boolean canHaveDisplayList() { 12883 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12884 } 12885 12886 /** 12887 * @return The {@link HardwareRenderer} associated with that view or null if 12888 * hardware rendering is not supported or this view is not attached 12889 * to a window. 12890 * 12891 * @hide 12892 */ 12893 public HardwareRenderer getHardwareRenderer() { 12894 if (mAttachInfo != null) { 12895 return mAttachInfo.mHardwareRenderer; 12896 } 12897 return null; 12898 } 12899 12900 /** 12901 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12902 * Otherwise, the same display list will be returned (after having been rendered into 12903 * along the way, depending on the invalidation state of the view). 12904 * 12905 * @param displayList The previous version of this displayList, could be null. 12906 * @param isLayer Whether the requester of the display list is a layer. If so, 12907 * the view will avoid creating a layer inside the resulting display list. 12908 * @return A new or reused DisplayList object. 12909 */ 12910 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12911 if (!canHaveDisplayList()) { 12912 return null; 12913 } 12914 12915 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 12916 displayList == null || !displayList.isValid() || 12917 (!isLayer && mRecreateDisplayList))) { 12918 // Don't need to recreate the display list, just need to tell our 12919 // children to restore/recreate theirs 12920 if (displayList != null && displayList.isValid() && 12921 !isLayer && !mRecreateDisplayList) { 12922 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12923 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12924 dispatchGetDisplayList(); 12925 12926 return displayList; 12927 } 12928 12929 if (!isLayer) { 12930 // If we got here, we're recreating it. Mark it as such to ensure that 12931 // we copy in child display lists into ours in drawChild() 12932 mRecreateDisplayList = true; 12933 } 12934 if (displayList == null) { 12935 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(getClass().getName()); 12936 // If we're creating a new display list, make sure our parent gets invalidated 12937 // since they will need to recreate their display list to account for this 12938 // new child display list. 12939 invalidateParentCaches(); 12940 } 12941 12942 boolean caching = false; 12943 int width = mRight - mLeft; 12944 int height = mBottom - mTop; 12945 int layerType = getLayerType(); 12946 12947 final HardwareCanvas canvas = displayList.start(width, height); 12948 12949 try { 12950 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12951 if (layerType == LAYER_TYPE_HARDWARE) { 12952 final HardwareLayer layer = getHardwareLayer(); 12953 if (layer != null && layer.isValid()) { 12954 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12955 } else { 12956 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12957 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12958 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12959 } 12960 caching = true; 12961 } else { 12962 buildDrawingCache(true); 12963 Bitmap cache = getDrawingCache(true); 12964 if (cache != null) { 12965 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12966 caching = true; 12967 } 12968 } 12969 } else { 12970 12971 computeScroll(); 12972 12973 canvas.translate(-mScrollX, -mScrollY); 12974 if (!isLayer) { 12975 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12976 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12977 } 12978 12979 // Fast path for layouts with no backgrounds 12980 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 12981 dispatchDraw(canvas); 12982 if (mOverlay != null && !mOverlay.isEmpty()) { 12983 mOverlay.getOverlayView().draw(canvas); 12984 } 12985 } else { 12986 draw(canvas); 12987 } 12988 } 12989 } finally { 12990 displayList.end(); 12991 displayList.setCaching(caching); 12992 if (isLayer) { 12993 displayList.setLeftTopRightBottom(0, 0, width, height); 12994 } else { 12995 setDisplayListProperties(displayList); 12996 } 12997 } 12998 } else if (!isLayer) { 12999 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 13000 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13001 } 13002 13003 return displayList; 13004 } 13005 13006 /** 13007 * Get the DisplayList for the HardwareLayer 13008 * 13009 * @param layer The HardwareLayer whose DisplayList we want 13010 * @return A DisplayList fopr the specified HardwareLayer 13011 */ 13012 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 13013 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 13014 layer.setDisplayList(displayList); 13015 return displayList; 13016 } 13017 13018 13019 /** 13020 * <p>Returns a display list that can be used to draw this view again 13021 * without executing its draw method.</p> 13022 * 13023 * @return A DisplayList ready to replay, or null if caching is not enabled. 13024 * 13025 * @hide 13026 */ 13027 public DisplayList getDisplayList() { 13028 mDisplayList = getDisplayList(mDisplayList, false); 13029 return mDisplayList; 13030 } 13031 13032 private void clearDisplayList() { 13033 if (mDisplayList != null) { 13034 mDisplayList.clear(); 13035 } 13036 } 13037 13038 /** 13039 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 13040 * 13041 * @return A non-scaled bitmap representing this view or null if cache is disabled. 13042 * 13043 * @see #getDrawingCache(boolean) 13044 */ 13045 public Bitmap getDrawingCache() { 13046 return getDrawingCache(false); 13047 } 13048 13049 /** 13050 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 13051 * is null when caching is disabled. If caching is enabled and the cache is not ready, 13052 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 13053 * draw from the cache when the cache is enabled. To benefit from the cache, you must 13054 * request the drawing cache by calling this method and draw it on screen if the 13055 * returned bitmap is not null.</p> 13056 * 13057 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13058 * this method will create a bitmap of the same size as this view. Because this bitmap 13059 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13060 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13061 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13062 * size than the view. This implies that your application must be able to handle this 13063 * size.</p> 13064 * 13065 * @param autoScale Indicates whether the generated bitmap should be scaled based on 13066 * the current density of the screen when the application is in compatibility 13067 * mode. 13068 * 13069 * @return A bitmap representing this view or null if cache is disabled. 13070 * 13071 * @see #setDrawingCacheEnabled(boolean) 13072 * @see #isDrawingCacheEnabled() 13073 * @see #buildDrawingCache(boolean) 13074 * @see #destroyDrawingCache() 13075 */ 13076 public Bitmap getDrawingCache(boolean autoScale) { 13077 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 13078 return null; 13079 } 13080 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 13081 buildDrawingCache(autoScale); 13082 } 13083 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 13084 } 13085 13086 /** 13087 * <p>Frees the resources used by the drawing cache. If you call 13088 * {@link #buildDrawingCache()} manually without calling 13089 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13090 * should cleanup the cache with this method afterwards.</p> 13091 * 13092 * @see #setDrawingCacheEnabled(boolean) 13093 * @see #buildDrawingCache() 13094 * @see #getDrawingCache() 13095 */ 13096 public void destroyDrawingCache() { 13097 if (mDrawingCache != null) { 13098 mDrawingCache.recycle(); 13099 mDrawingCache = null; 13100 } 13101 if (mUnscaledDrawingCache != null) { 13102 mUnscaledDrawingCache.recycle(); 13103 mUnscaledDrawingCache = null; 13104 } 13105 } 13106 13107 /** 13108 * Setting a solid background color for the drawing cache's bitmaps will improve 13109 * performance and memory usage. Note, though that this should only be used if this 13110 * view will always be drawn on top of a solid color. 13111 * 13112 * @param color The background color to use for the drawing cache's bitmap 13113 * 13114 * @see #setDrawingCacheEnabled(boolean) 13115 * @see #buildDrawingCache() 13116 * @see #getDrawingCache() 13117 */ 13118 public void setDrawingCacheBackgroundColor(int color) { 13119 if (color != mDrawingCacheBackgroundColor) { 13120 mDrawingCacheBackgroundColor = color; 13121 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 13122 } 13123 } 13124 13125 /** 13126 * @see #setDrawingCacheBackgroundColor(int) 13127 * 13128 * @return The background color to used for the drawing cache's bitmap 13129 */ 13130 public int getDrawingCacheBackgroundColor() { 13131 return mDrawingCacheBackgroundColor; 13132 } 13133 13134 /** 13135 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 13136 * 13137 * @see #buildDrawingCache(boolean) 13138 */ 13139 public void buildDrawingCache() { 13140 buildDrawingCache(false); 13141 } 13142 13143 /** 13144 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 13145 * 13146 * <p>If you call {@link #buildDrawingCache()} manually without calling 13147 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13148 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 13149 * 13150 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13151 * this method will create a bitmap of the same size as this view. Because this bitmap 13152 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13153 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13154 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13155 * size than the view. This implies that your application must be able to handle this 13156 * size.</p> 13157 * 13158 * <p>You should avoid calling this method when hardware acceleration is enabled. If 13159 * you do not need the drawing cache bitmap, calling this method will increase memory 13160 * usage and cause the view to be rendered in software once, thus negatively impacting 13161 * performance.</p> 13162 * 13163 * @see #getDrawingCache() 13164 * @see #destroyDrawingCache() 13165 */ 13166 public void buildDrawingCache(boolean autoScale) { 13167 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 13168 mDrawingCache == null : mUnscaledDrawingCache == null)) { 13169 mCachingFailed = false; 13170 13171 int width = mRight - mLeft; 13172 int height = mBottom - mTop; 13173 13174 final AttachInfo attachInfo = mAttachInfo; 13175 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 13176 13177 if (autoScale && scalingRequired) { 13178 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 13179 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 13180 } 13181 13182 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 13183 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 13184 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 13185 13186 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 13187 final long drawingCacheSize = 13188 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 13189 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 13190 if (width > 0 && height > 0) { 13191 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 13192 + projectedBitmapSize + " bytes, only " 13193 + drawingCacheSize + " available"); 13194 } 13195 destroyDrawingCache(); 13196 mCachingFailed = true; 13197 return; 13198 } 13199 13200 boolean clear = true; 13201 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 13202 13203 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 13204 Bitmap.Config quality; 13205 if (!opaque) { 13206 // Never pick ARGB_4444 because it looks awful 13207 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 13208 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 13209 case DRAWING_CACHE_QUALITY_AUTO: 13210 quality = Bitmap.Config.ARGB_8888; 13211 break; 13212 case DRAWING_CACHE_QUALITY_LOW: 13213 quality = Bitmap.Config.ARGB_8888; 13214 break; 13215 case DRAWING_CACHE_QUALITY_HIGH: 13216 quality = Bitmap.Config.ARGB_8888; 13217 break; 13218 default: 13219 quality = Bitmap.Config.ARGB_8888; 13220 break; 13221 } 13222 } else { 13223 // Optimization for translucent windows 13224 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 13225 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 13226 } 13227 13228 // Try to cleanup memory 13229 if (bitmap != null) bitmap.recycle(); 13230 13231 try { 13232 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13233 width, height, quality); 13234 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 13235 if (autoScale) { 13236 mDrawingCache = bitmap; 13237 } else { 13238 mUnscaledDrawingCache = bitmap; 13239 } 13240 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 13241 } catch (OutOfMemoryError e) { 13242 // If there is not enough memory to create the bitmap cache, just 13243 // ignore the issue as bitmap caches are not required to draw the 13244 // view hierarchy 13245 if (autoScale) { 13246 mDrawingCache = null; 13247 } else { 13248 mUnscaledDrawingCache = null; 13249 } 13250 mCachingFailed = true; 13251 return; 13252 } 13253 13254 clear = drawingCacheBackgroundColor != 0; 13255 } 13256 13257 Canvas canvas; 13258 if (attachInfo != null) { 13259 canvas = attachInfo.mCanvas; 13260 if (canvas == null) { 13261 canvas = new Canvas(); 13262 } 13263 canvas.setBitmap(bitmap); 13264 // Temporarily clobber the cached Canvas in case one of our children 13265 // is also using a drawing cache. Without this, the children would 13266 // steal the canvas by attaching their own bitmap to it and bad, bad 13267 // thing would happen (invisible views, corrupted drawings, etc.) 13268 attachInfo.mCanvas = null; 13269 } else { 13270 // This case should hopefully never or seldom happen 13271 canvas = new Canvas(bitmap); 13272 } 13273 13274 if (clear) { 13275 bitmap.eraseColor(drawingCacheBackgroundColor); 13276 } 13277 13278 computeScroll(); 13279 final int restoreCount = canvas.save(); 13280 13281 if (autoScale && scalingRequired) { 13282 final float scale = attachInfo.mApplicationScale; 13283 canvas.scale(scale, scale); 13284 } 13285 13286 canvas.translate(-mScrollX, -mScrollY); 13287 13288 mPrivateFlags |= PFLAG_DRAWN; 13289 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 13290 mLayerType != LAYER_TYPE_NONE) { 13291 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 13292 } 13293 13294 // Fast path for layouts with no backgrounds 13295 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13296 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13297 dispatchDraw(canvas); 13298 if (mOverlay != null && !mOverlay.isEmpty()) { 13299 mOverlay.getOverlayView().draw(canvas); 13300 } 13301 } else { 13302 draw(canvas); 13303 } 13304 13305 canvas.restoreToCount(restoreCount); 13306 canvas.setBitmap(null); 13307 13308 if (attachInfo != null) { 13309 // Restore the cached Canvas for our siblings 13310 attachInfo.mCanvas = canvas; 13311 } 13312 } 13313 } 13314 13315 /** 13316 * Create a snapshot of the view into a bitmap. We should probably make 13317 * some form of this public, but should think about the API. 13318 */ 13319 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 13320 int width = mRight - mLeft; 13321 int height = mBottom - mTop; 13322 13323 final AttachInfo attachInfo = mAttachInfo; 13324 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 13325 width = (int) ((width * scale) + 0.5f); 13326 height = (int) ((height * scale) + 0.5f); 13327 13328 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13329 width > 0 ? width : 1, height > 0 ? height : 1, quality); 13330 if (bitmap == null) { 13331 throw new OutOfMemoryError(); 13332 } 13333 13334 Resources resources = getResources(); 13335 if (resources != null) { 13336 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 13337 } 13338 13339 Canvas canvas; 13340 if (attachInfo != null) { 13341 canvas = attachInfo.mCanvas; 13342 if (canvas == null) { 13343 canvas = new Canvas(); 13344 } 13345 canvas.setBitmap(bitmap); 13346 // Temporarily clobber the cached Canvas in case one of our children 13347 // is also using a drawing cache. Without this, the children would 13348 // steal the canvas by attaching their own bitmap to it and bad, bad 13349 // things would happen (invisible views, corrupted drawings, etc.) 13350 attachInfo.mCanvas = null; 13351 } else { 13352 // This case should hopefully never or seldom happen 13353 canvas = new Canvas(bitmap); 13354 } 13355 13356 if ((backgroundColor & 0xff000000) != 0) { 13357 bitmap.eraseColor(backgroundColor); 13358 } 13359 13360 computeScroll(); 13361 final int restoreCount = canvas.save(); 13362 canvas.scale(scale, scale); 13363 canvas.translate(-mScrollX, -mScrollY); 13364 13365 // Temporarily remove the dirty mask 13366 int flags = mPrivateFlags; 13367 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13368 13369 // Fast path for layouts with no backgrounds 13370 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13371 dispatchDraw(canvas); 13372 } else { 13373 draw(canvas); 13374 } 13375 13376 mPrivateFlags = flags; 13377 13378 canvas.restoreToCount(restoreCount); 13379 canvas.setBitmap(null); 13380 13381 if (attachInfo != null) { 13382 // Restore the cached Canvas for our siblings 13383 attachInfo.mCanvas = canvas; 13384 } 13385 13386 return bitmap; 13387 } 13388 13389 /** 13390 * Indicates whether this View is currently in edit mode. A View is usually 13391 * in edit mode when displayed within a developer tool. For instance, if 13392 * this View is being drawn by a visual user interface builder, this method 13393 * should return true. 13394 * 13395 * Subclasses should check the return value of this method to provide 13396 * different behaviors if their normal behavior might interfere with the 13397 * host environment. For instance: the class spawns a thread in its 13398 * constructor, the drawing code relies on device-specific features, etc. 13399 * 13400 * This method is usually checked in the drawing code of custom widgets. 13401 * 13402 * @return True if this View is in edit mode, false otherwise. 13403 */ 13404 public boolean isInEditMode() { 13405 return false; 13406 } 13407 13408 /** 13409 * If the View draws content inside its padding and enables fading edges, 13410 * it needs to support padding offsets. Padding offsets are added to the 13411 * fading edges to extend the length of the fade so that it covers pixels 13412 * drawn inside the padding. 13413 * 13414 * Subclasses of this class should override this method if they need 13415 * to draw content inside the padding. 13416 * 13417 * @return True if padding offset must be applied, false otherwise. 13418 * 13419 * @see #getLeftPaddingOffset() 13420 * @see #getRightPaddingOffset() 13421 * @see #getTopPaddingOffset() 13422 * @see #getBottomPaddingOffset() 13423 * 13424 * @since CURRENT 13425 */ 13426 protected boolean isPaddingOffsetRequired() { 13427 return false; 13428 } 13429 13430 /** 13431 * Amount by which to extend the left fading region. Called only when 13432 * {@link #isPaddingOffsetRequired()} returns true. 13433 * 13434 * @return The left padding offset in pixels. 13435 * 13436 * @see #isPaddingOffsetRequired() 13437 * 13438 * @since CURRENT 13439 */ 13440 protected int getLeftPaddingOffset() { 13441 return 0; 13442 } 13443 13444 /** 13445 * Amount by which to extend the right fading region. Called only when 13446 * {@link #isPaddingOffsetRequired()} returns true. 13447 * 13448 * @return The right padding offset in pixels. 13449 * 13450 * @see #isPaddingOffsetRequired() 13451 * 13452 * @since CURRENT 13453 */ 13454 protected int getRightPaddingOffset() { 13455 return 0; 13456 } 13457 13458 /** 13459 * Amount by which to extend the top fading region. Called only when 13460 * {@link #isPaddingOffsetRequired()} returns true. 13461 * 13462 * @return The top padding offset in pixels. 13463 * 13464 * @see #isPaddingOffsetRequired() 13465 * 13466 * @since CURRENT 13467 */ 13468 protected int getTopPaddingOffset() { 13469 return 0; 13470 } 13471 13472 /** 13473 * Amount by which to extend the bottom fading region. Called only when 13474 * {@link #isPaddingOffsetRequired()} returns true. 13475 * 13476 * @return The bottom padding offset in pixels. 13477 * 13478 * @see #isPaddingOffsetRequired() 13479 * 13480 * @since CURRENT 13481 */ 13482 protected int getBottomPaddingOffset() { 13483 return 0; 13484 } 13485 13486 /** 13487 * @hide 13488 * @param offsetRequired 13489 */ 13490 protected int getFadeTop(boolean offsetRequired) { 13491 int top = mPaddingTop; 13492 if (offsetRequired) top += getTopPaddingOffset(); 13493 return top; 13494 } 13495 13496 /** 13497 * @hide 13498 * @param offsetRequired 13499 */ 13500 protected int getFadeHeight(boolean offsetRequired) { 13501 int padding = mPaddingTop; 13502 if (offsetRequired) padding += getTopPaddingOffset(); 13503 return mBottom - mTop - mPaddingBottom - padding; 13504 } 13505 13506 /** 13507 * <p>Indicates whether this view is attached to a hardware accelerated 13508 * window or not.</p> 13509 * 13510 * <p>Even if this method returns true, it does not mean that every call 13511 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13512 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13513 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13514 * window is hardware accelerated, 13515 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13516 * return false, and this method will return true.</p> 13517 * 13518 * @return True if the view is attached to a window and the window is 13519 * hardware accelerated; false in any other case. 13520 */ 13521 public boolean isHardwareAccelerated() { 13522 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13523 } 13524 13525 /** 13526 * Sets a rectangular area on this view to which the view will be clipped 13527 * when it is drawn. Setting the value to null will remove the clip bounds 13528 * and the view will draw normally, using its full bounds. 13529 * 13530 * @param clipBounds The rectangular area, in the local coordinates of 13531 * this view, to which future drawing operations will be clipped. 13532 */ 13533 public void setClipBounds(Rect clipBounds) { 13534 if (clipBounds != null) { 13535 if (clipBounds.equals(mClipBounds)) { 13536 return; 13537 } 13538 if (mClipBounds == null) { 13539 invalidate(); 13540 mClipBounds = new Rect(clipBounds); 13541 } else { 13542 invalidate(Math.min(mClipBounds.left, clipBounds.left), 13543 Math.min(mClipBounds.top, clipBounds.top), 13544 Math.max(mClipBounds.right, clipBounds.right), 13545 Math.max(mClipBounds.bottom, clipBounds.bottom)); 13546 mClipBounds.set(clipBounds); 13547 } 13548 } else { 13549 if (mClipBounds != null) { 13550 invalidate(); 13551 mClipBounds = null; 13552 } 13553 } 13554 } 13555 13556 /** 13557 * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. 13558 * 13559 * @return A copy of the current clip bounds if clip bounds are set, 13560 * otherwise null. 13561 */ 13562 public Rect getClipBounds() { 13563 return (mClipBounds != null) ? new Rect(mClipBounds) : null; 13564 } 13565 13566 /** 13567 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13568 * case of an active Animation being run on the view. 13569 */ 13570 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13571 Animation a, boolean scalingRequired) { 13572 Transformation invalidationTransform; 13573 final int flags = parent.mGroupFlags; 13574 final boolean initialized = a.isInitialized(); 13575 if (!initialized) { 13576 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13577 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13578 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13579 onAnimationStart(); 13580 } 13581 13582 final Transformation t = parent.getChildTransformation(); 13583 boolean more = a.getTransformation(drawingTime, t, 1f); 13584 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13585 if (parent.mInvalidationTransformation == null) { 13586 parent.mInvalidationTransformation = new Transformation(); 13587 } 13588 invalidationTransform = parent.mInvalidationTransformation; 13589 a.getTransformation(drawingTime, invalidationTransform, 1f); 13590 } else { 13591 invalidationTransform = t; 13592 } 13593 13594 if (more) { 13595 if (!a.willChangeBounds()) { 13596 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13597 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13598 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13599 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13600 // The child need to draw an animation, potentially offscreen, so 13601 // make sure we do not cancel invalidate requests 13602 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13603 parent.invalidate(mLeft, mTop, mRight, mBottom); 13604 } 13605 } else { 13606 if (parent.mInvalidateRegion == null) { 13607 parent.mInvalidateRegion = new RectF(); 13608 } 13609 final RectF region = parent.mInvalidateRegion; 13610 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13611 invalidationTransform); 13612 13613 // The child need to draw an animation, potentially offscreen, so 13614 // make sure we do not cancel invalidate requests 13615 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13616 13617 final int left = mLeft + (int) region.left; 13618 final int top = mTop + (int) region.top; 13619 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13620 top + (int) (region.height() + .5f)); 13621 } 13622 } 13623 return more; 13624 } 13625 13626 /** 13627 * This method is called by getDisplayList() when a display list is created or re-rendered. 13628 * It sets or resets the current value of all properties on that display list (resetting is 13629 * necessary when a display list is being re-created, because we need to make sure that 13630 * previously-set transform values 13631 */ 13632 void setDisplayListProperties(DisplayList displayList) { 13633 if (displayList != null) { 13634 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13635 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13636 if (mParent instanceof ViewGroup) { 13637 displayList.setClipToBounds( 13638 (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 13639 } 13640 float alpha = 1; 13641 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 13642 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13643 ViewGroup parentVG = (ViewGroup) mParent; 13644 final Transformation t = parentVG.getChildTransformation(); 13645 if (parentVG.getChildStaticTransformation(this, t)) { 13646 final int transformType = t.getTransformationType(); 13647 if (transformType != Transformation.TYPE_IDENTITY) { 13648 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 13649 alpha = t.getAlpha(); 13650 } 13651 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 13652 displayList.setMatrix(t.getMatrix()); 13653 } 13654 } 13655 } 13656 } 13657 if (mTransformationInfo != null) { 13658 alpha *= mTransformationInfo.mAlpha; 13659 if (alpha < 1) { 13660 final int multipliedAlpha = (int) (255 * alpha); 13661 if (onSetAlpha(multipliedAlpha)) { 13662 alpha = 1; 13663 } 13664 } 13665 displayList.setTransformationInfo(alpha, 13666 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 13667 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 13668 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 13669 mTransformationInfo.mScaleY); 13670 if (mTransformationInfo.mCamera == null) { 13671 mTransformationInfo.mCamera = new Camera(); 13672 mTransformationInfo.matrix3D = new Matrix(); 13673 } 13674 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 13675 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 13676 displayList.setPivotX(getPivotX()); 13677 displayList.setPivotY(getPivotY()); 13678 } 13679 } else if (alpha < 1) { 13680 displayList.setAlpha(alpha); 13681 } 13682 } 13683 } 13684 13685 /** 13686 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 13687 * This draw() method is an implementation detail and is not intended to be overridden or 13688 * to be called from anywhere else other than ViewGroup.drawChild(). 13689 */ 13690 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 13691 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13692 boolean more = false; 13693 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 13694 final int flags = parent.mGroupFlags; 13695 13696 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 13697 parent.getChildTransformation().clear(); 13698 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13699 } 13700 13701 Transformation transformToApply = null; 13702 boolean concatMatrix = false; 13703 13704 boolean scalingRequired = false; 13705 boolean caching; 13706 int layerType = getLayerType(); 13707 13708 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 13709 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 13710 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 13711 caching = true; 13712 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 13713 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 13714 } else { 13715 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 13716 } 13717 13718 final Animation a = getAnimation(); 13719 if (a != null) { 13720 more = drawAnimation(parent, drawingTime, a, scalingRequired); 13721 concatMatrix = a.willChangeTransformationMatrix(); 13722 if (concatMatrix) { 13723 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13724 } 13725 transformToApply = parent.getChildTransformation(); 13726 } else { 13727 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == 13728 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { 13729 // No longer animating: clear out old animation matrix 13730 mDisplayList.setAnimationMatrix(null); 13731 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13732 } 13733 if (!useDisplayListProperties && 13734 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13735 final Transformation t = parent.getChildTransformation(); 13736 final boolean hasTransform = parent.getChildStaticTransformation(this, t); 13737 if (hasTransform) { 13738 final int transformType = t.getTransformationType(); 13739 transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null; 13740 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 13741 } 13742 } 13743 } 13744 13745 concatMatrix |= !childHasIdentityMatrix; 13746 13747 // Sets the flag as early as possible to allow draw() implementations 13748 // to call invalidate() successfully when doing animations 13749 mPrivateFlags |= PFLAG_DRAWN; 13750 13751 if (!concatMatrix && 13752 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 13753 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 13754 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 13755 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 13756 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 13757 return more; 13758 } 13759 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 13760 13761 if (hardwareAccelerated) { 13762 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 13763 // retain the flag's value temporarily in the mRecreateDisplayList flag 13764 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 13765 mPrivateFlags &= ~PFLAG_INVALIDATED; 13766 } 13767 13768 DisplayList displayList = null; 13769 Bitmap cache = null; 13770 boolean hasDisplayList = false; 13771 if (caching) { 13772 if (!hardwareAccelerated) { 13773 if (layerType != LAYER_TYPE_NONE) { 13774 layerType = LAYER_TYPE_SOFTWARE; 13775 buildDrawingCache(true); 13776 } 13777 cache = getDrawingCache(true); 13778 } else { 13779 switch (layerType) { 13780 case LAYER_TYPE_SOFTWARE: 13781 if (useDisplayListProperties) { 13782 hasDisplayList = canHaveDisplayList(); 13783 } else { 13784 buildDrawingCache(true); 13785 cache = getDrawingCache(true); 13786 } 13787 break; 13788 case LAYER_TYPE_HARDWARE: 13789 if (useDisplayListProperties) { 13790 hasDisplayList = canHaveDisplayList(); 13791 } 13792 break; 13793 case LAYER_TYPE_NONE: 13794 // Delay getting the display list until animation-driven alpha values are 13795 // set up and possibly passed on to the view 13796 hasDisplayList = canHaveDisplayList(); 13797 break; 13798 } 13799 } 13800 } 13801 useDisplayListProperties &= hasDisplayList; 13802 if (useDisplayListProperties) { 13803 displayList = getDisplayList(); 13804 if (!displayList.isValid()) { 13805 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13806 // to getDisplayList(), the display list will be marked invalid and we should not 13807 // try to use it again. 13808 displayList = null; 13809 hasDisplayList = false; 13810 useDisplayListProperties = false; 13811 } 13812 } 13813 13814 int sx = 0; 13815 int sy = 0; 13816 if (!hasDisplayList) { 13817 computeScroll(); 13818 sx = mScrollX; 13819 sy = mScrollY; 13820 } 13821 13822 final boolean hasNoCache = cache == null || hasDisplayList; 13823 final boolean offsetForScroll = cache == null && !hasDisplayList && 13824 layerType != LAYER_TYPE_HARDWARE; 13825 13826 int restoreTo = -1; 13827 if (!useDisplayListProperties || transformToApply != null) { 13828 restoreTo = canvas.save(); 13829 } 13830 if (offsetForScroll) { 13831 canvas.translate(mLeft - sx, mTop - sy); 13832 } else { 13833 if (!useDisplayListProperties) { 13834 canvas.translate(mLeft, mTop); 13835 } 13836 if (scalingRequired) { 13837 if (useDisplayListProperties) { 13838 // TODO: Might not need this if we put everything inside the DL 13839 restoreTo = canvas.save(); 13840 } 13841 // mAttachInfo cannot be null, otherwise scalingRequired == false 13842 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13843 canvas.scale(scale, scale); 13844 } 13845 } 13846 13847 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13848 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13849 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13850 if (transformToApply != null || !childHasIdentityMatrix) { 13851 int transX = 0; 13852 int transY = 0; 13853 13854 if (offsetForScroll) { 13855 transX = -sx; 13856 transY = -sy; 13857 } 13858 13859 if (transformToApply != null) { 13860 if (concatMatrix) { 13861 if (useDisplayListProperties) { 13862 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13863 } else { 13864 // Undo the scroll translation, apply the transformation matrix, 13865 // then redo the scroll translate to get the correct result. 13866 canvas.translate(-transX, -transY); 13867 canvas.concat(transformToApply.getMatrix()); 13868 canvas.translate(transX, transY); 13869 } 13870 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13871 } 13872 13873 float transformAlpha = transformToApply.getAlpha(); 13874 if (transformAlpha < 1) { 13875 alpha *= transformAlpha; 13876 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13877 } 13878 } 13879 13880 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13881 canvas.translate(-transX, -transY); 13882 canvas.concat(getMatrix()); 13883 canvas.translate(transX, transY); 13884 } 13885 } 13886 13887 // Deal with alpha if it is or used to be <1 13888 if (alpha < 1 || 13889 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13890 if (alpha < 1) { 13891 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13892 } else { 13893 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13894 } 13895 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13896 if (hasNoCache) { 13897 final int multipliedAlpha = (int) (255 * alpha); 13898 if (!onSetAlpha(multipliedAlpha)) { 13899 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13900 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13901 layerType != LAYER_TYPE_NONE) { 13902 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13903 } 13904 if (useDisplayListProperties) { 13905 displayList.setAlpha(alpha * getAlpha()); 13906 } else if (layerType == LAYER_TYPE_NONE) { 13907 final int scrollX = hasDisplayList ? 0 : sx; 13908 final int scrollY = hasDisplayList ? 0 : sy; 13909 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13910 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13911 } 13912 } else { 13913 // Alpha is handled by the child directly, clobber the layer's alpha 13914 mPrivateFlags |= PFLAG_ALPHA_SET; 13915 } 13916 } 13917 } 13918 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13919 onSetAlpha(255); 13920 mPrivateFlags &= ~PFLAG_ALPHA_SET; 13921 } 13922 13923 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13924 !useDisplayListProperties && cache == null) { 13925 if (offsetForScroll) { 13926 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13927 } else { 13928 if (!scalingRequired || cache == null) { 13929 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13930 } else { 13931 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13932 } 13933 } 13934 } 13935 13936 if (!useDisplayListProperties && hasDisplayList) { 13937 displayList = getDisplayList(); 13938 if (!displayList.isValid()) { 13939 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13940 // to getDisplayList(), the display list will be marked invalid and we should not 13941 // try to use it again. 13942 displayList = null; 13943 hasDisplayList = false; 13944 } 13945 } 13946 13947 if (hasNoCache) { 13948 boolean layerRendered = false; 13949 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13950 final HardwareLayer layer = getHardwareLayer(); 13951 if (layer != null && layer.isValid()) { 13952 mLayerPaint.setAlpha((int) (alpha * 255)); 13953 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13954 layerRendered = true; 13955 } else { 13956 final int scrollX = hasDisplayList ? 0 : sx; 13957 final int scrollY = hasDisplayList ? 0 : sy; 13958 canvas.saveLayer(scrollX, scrollY, 13959 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13960 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13961 } 13962 } 13963 13964 if (!layerRendered) { 13965 if (!hasDisplayList) { 13966 // Fast path for layouts with no backgrounds 13967 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13968 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13969 dispatchDraw(canvas); 13970 } else { 13971 draw(canvas); 13972 } 13973 } else { 13974 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13975 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13976 } 13977 } 13978 } else if (cache != null) { 13979 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13980 Paint cachePaint; 13981 13982 if (layerType == LAYER_TYPE_NONE) { 13983 cachePaint = parent.mCachePaint; 13984 if (cachePaint == null) { 13985 cachePaint = new Paint(); 13986 cachePaint.setDither(false); 13987 parent.mCachePaint = cachePaint; 13988 } 13989 if (alpha < 1) { 13990 cachePaint.setAlpha((int) (alpha * 255)); 13991 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13992 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13993 cachePaint.setAlpha(255); 13994 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13995 } 13996 } else { 13997 cachePaint = mLayerPaint; 13998 cachePaint.setAlpha((int) (alpha * 255)); 13999 } 14000 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 14001 } 14002 14003 if (restoreTo >= 0) { 14004 canvas.restoreToCount(restoreTo); 14005 } 14006 14007 if (a != null && !more) { 14008 if (!hardwareAccelerated && !a.getFillAfter()) { 14009 onSetAlpha(255); 14010 } 14011 parent.finishAnimatingView(this, a); 14012 } 14013 14014 if (more && hardwareAccelerated) { 14015 // invalidation is the trigger to recreate display lists, so if we're using 14016 // display lists to render, force an invalidate to allow the animation to 14017 // continue drawing another frame 14018 parent.invalidate(true); 14019 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 14020 // alpha animations should cause the child to recreate its display list 14021 invalidate(true); 14022 } 14023 } 14024 14025 mRecreateDisplayList = false; 14026 14027 return more; 14028 } 14029 14030 /** 14031 * Manually render this view (and all of its children) to the given Canvas. 14032 * The view must have already done a full layout before this function is 14033 * called. When implementing a view, implement 14034 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 14035 * If you do need to override this method, call the superclass version. 14036 * 14037 * @param canvas The Canvas to which the View is rendered. 14038 */ 14039 public void draw(Canvas canvas) { 14040 if (mClipBounds != null) { 14041 canvas.clipRect(mClipBounds); 14042 } 14043 final int privateFlags = mPrivateFlags; 14044 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 14045 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 14046 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 14047 14048 /* 14049 * Draw traversal performs several drawing steps which must be executed 14050 * in the appropriate order: 14051 * 14052 * 1. Draw the background 14053 * 2. If necessary, save the canvas' layers to prepare for fading 14054 * 3. Draw view's content 14055 * 4. Draw children 14056 * 5. If necessary, draw the fading edges and restore layers 14057 * 6. Draw decorations (scrollbars for instance) 14058 */ 14059 14060 // Step 1, draw the background, if needed 14061 int saveCount; 14062 14063 if (!dirtyOpaque) { 14064 final Drawable background = mBackground; 14065 if (background != null) { 14066 final int scrollX = mScrollX; 14067 final int scrollY = mScrollY; 14068 14069 if (mBackgroundSizeChanged) { 14070 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 14071 mBackgroundSizeChanged = false; 14072 } 14073 14074 if ((scrollX | scrollY) == 0) { 14075 background.draw(canvas); 14076 } else { 14077 canvas.translate(scrollX, scrollY); 14078 background.draw(canvas); 14079 canvas.translate(-scrollX, -scrollY); 14080 } 14081 } 14082 } 14083 14084 // skip step 2 & 5 if possible (common case) 14085 final int viewFlags = mViewFlags; 14086 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 14087 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 14088 if (!verticalEdges && !horizontalEdges) { 14089 // Step 3, draw the content 14090 if (!dirtyOpaque) onDraw(canvas); 14091 14092 // Step 4, draw the children 14093 dispatchDraw(canvas); 14094 14095 // Step 6, draw decorations (scrollbars) 14096 onDrawScrollBars(canvas); 14097 14098 if (mOverlay != null && !mOverlay.isEmpty()) { 14099 mOverlay.getOverlayView().dispatchDraw(canvas); 14100 } 14101 14102 // we're done... 14103 return; 14104 } 14105 14106 /* 14107 * Here we do the full fledged routine... 14108 * (this is an uncommon case where speed matters less, 14109 * this is why we repeat some of the tests that have been 14110 * done above) 14111 */ 14112 14113 boolean drawTop = false; 14114 boolean drawBottom = false; 14115 boolean drawLeft = false; 14116 boolean drawRight = false; 14117 14118 float topFadeStrength = 0.0f; 14119 float bottomFadeStrength = 0.0f; 14120 float leftFadeStrength = 0.0f; 14121 float rightFadeStrength = 0.0f; 14122 14123 // Step 2, save the canvas' layers 14124 int paddingLeft = mPaddingLeft; 14125 14126 final boolean offsetRequired = isPaddingOffsetRequired(); 14127 if (offsetRequired) { 14128 paddingLeft += getLeftPaddingOffset(); 14129 } 14130 14131 int left = mScrollX + paddingLeft; 14132 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 14133 int top = mScrollY + getFadeTop(offsetRequired); 14134 int bottom = top + getFadeHeight(offsetRequired); 14135 14136 if (offsetRequired) { 14137 right += getRightPaddingOffset(); 14138 bottom += getBottomPaddingOffset(); 14139 } 14140 14141 final ScrollabilityCache scrollabilityCache = mScrollCache; 14142 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 14143 int length = (int) fadeHeight; 14144 14145 // clip the fade length if top and bottom fades overlap 14146 // overlapping fades produce odd-looking artifacts 14147 if (verticalEdges && (top + length > bottom - length)) { 14148 length = (bottom - top) / 2; 14149 } 14150 14151 // also clip horizontal fades if necessary 14152 if (horizontalEdges && (left + length > right - length)) { 14153 length = (right - left) / 2; 14154 } 14155 14156 if (verticalEdges) { 14157 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 14158 drawTop = topFadeStrength * fadeHeight > 1.0f; 14159 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 14160 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 14161 } 14162 14163 if (horizontalEdges) { 14164 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 14165 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 14166 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 14167 drawRight = rightFadeStrength * fadeHeight > 1.0f; 14168 } 14169 14170 saveCount = canvas.getSaveCount(); 14171 14172 int solidColor = getSolidColor(); 14173 if (solidColor == 0) { 14174 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14175 14176 if (drawTop) { 14177 canvas.saveLayer(left, top, right, top + length, null, flags); 14178 } 14179 14180 if (drawBottom) { 14181 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 14182 } 14183 14184 if (drawLeft) { 14185 canvas.saveLayer(left, top, left + length, bottom, null, flags); 14186 } 14187 14188 if (drawRight) { 14189 canvas.saveLayer(right - length, top, right, bottom, null, flags); 14190 } 14191 } else { 14192 scrollabilityCache.setFadeColor(solidColor); 14193 } 14194 14195 // Step 3, draw the content 14196 if (!dirtyOpaque) onDraw(canvas); 14197 14198 // Step 4, draw the children 14199 dispatchDraw(canvas); 14200 14201 // Step 5, draw the fade effect and restore layers 14202 final Paint p = scrollabilityCache.paint; 14203 final Matrix matrix = scrollabilityCache.matrix; 14204 final Shader fade = scrollabilityCache.shader; 14205 14206 if (drawTop) { 14207 matrix.setScale(1, fadeHeight * topFadeStrength); 14208 matrix.postTranslate(left, top); 14209 fade.setLocalMatrix(matrix); 14210 canvas.drawRect(left, top, right, top + length, p); 14211 } 14212 14213 if (drawBottom) { 14214 matrix.setScale(1, fadeHeight * bottomFadeStrength); 14215 matrix.postRotate(180); 14216 matrix.postTranslate(left, bottom); 14217 fade.setLocalMatrix(matrix); 14218 canvas.drawRect(left, bottom - length, right, bottom, p); 14219 } 14220 14221 if (drawLeft) { 14222 matrix.setScale(1, fadeHeight * leftFadeStrength); 14223 matrix.postRotate(-90); 14224 matrix.postTranslate(left, top); 14225 fade.setLocalMatrix(matrix); 14226 canvas.drawRect(left, top, left + length, bottom, p); 14227 } 14228 14229 if (drawRight) { 14230 matrix.setScale(1, fadeHeight * rightFadeStrength); 14231 matrix.postRotate(90); 14232 matrix.postTranslate(right, top); 14233 fade.setLocalMatrix(matrix); 14234 canvas.drawRect(right - length, top, right, bottom, p); 14235 } 14236 14237 canvas.restoreToCount(saveCount); 14238 14239 // Step 6, draw decorations (scrollbars) 14240 onDrawScrollBars(canvas); 14241 14242 if (mOverlay != null && !mOverlay.isEmpty()) { 14243 mOverlay.getOverlayView().dispatchDraw(canvas); 14244 } 14245 } 14246 14247 /** 14248 * Returns the overlay for this view, creating it if it does not yet exist. 14249 * Adding drawables to the overlay will cause them to be displayed whenever 14250 * the view itself is redrawn. Objects in the overlay should be actively 14251 * managed: remove them when they should not be displayed anymore. The 14252 * overlay will always have the same size as its host view. 14253 * 14254 * <p>Note: Overlays do not currently work correctly with {@link 14255 * SurfaceView} or {@link TextureView}; contents in overlays for these 14256 * types of views may not display correctly.</p> 14257 * 14258 * @return The ViewOverlay object for this view. 14259 * @see ViewOverlay 14260 */ 14261 public ViewOverlay getOverlay() { 14262 if (mOverlay == null) { 14263 mOverlay = new ViewOverlay(mContext, this); 14264 } 14265 return mOverlay; 14266 } 14267 14268 /** 14269 * Override this if your view is known to always be drawn on top of a solid color background, 14270 * and needs to draw fading edges. Returning a non-zero color enables the view system to 14271 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 14272 * should be set to 0xFF. 14273 * 14274 * @see #setVerticalFadingEdgeEnabled(boolean) 14275 * @see #setHorizontalFadingEdgeEnabled(boolean) 14276 * 14277 * @return The known solid color background for this view, or 0 if the color may vary 14278 */ 14279 @ViewDebug.ExportedProperty(category = "drawing") 14280 public int getSolidColor() { 14281 return 0; 14282 } 14283 14284 /** 14285 * Build a human readable string representation of the specified view flags. 14286 * 14287 * @param flags the view flags to convert to a string 14288 * @return a String representing the supplied flags 14289 */ 14290 private static String printFlags(int flags) { 14291 String output = ""; 14292 int numFlags = 0; 14293 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 14294 output += "TAKES_FOCUS"; 14295 numFlags++; 14296 } 14297 14298 switch (flags & VISIBILITY_MASK) { 14299 case INVISIBLE: 14300 if (numFlags > 0) { 14301 output += " "; 14302 } 14303 output += "INVISIBLE"; 14304 // USELESS HERE numFlags++; 14305 break; 14306 case GONE: 14307 if (numFlags > 0) { 14308 output += " "; 14309 } 14310 output += "GONE"; 14311 // USELESS HERE numFlags++; 14312 break; 14313 default: 14314 break; 14315 } 14316 return output; 14317 } 14318 14319 /** 14320 * Build a human readable string representation of the specified private 14321 * view flags. 14322 * 14323 * @param privateFlags the private view flags to convert to a string 14324 * @return a String representing the supplied flags 14325 */ 14326 private static String printPrivateFlags(int privateFlags) { 14327 String output = ""; 14328 int numFlags = 0; 14329 14330 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 14331 output += "WANTS_FOCUS"; 14332 numFlags++; 14333 } 14334 14335 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 14336 if (numFlags > 0) { 14337 output += " "; 14338 } 14339 output += "FOCUSED"; 14340 numFlags++; 14341 } 14342 14343 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 14344 if (numFlags > 0) { 14345 output += " "; 14346 } 14347 output += "SELECTED"; 14348 numFlags++; 14349 } 14350 14351 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 14352 if (numFlags > 0) { 14353 output += " "; 14354 } 14355 output += "IS_ROOT_NAMESPACE"; 14356 numFlags++; 14357 } 14358 14359 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 14360 if (numFlags > 0) { 14361 output += " "; 14362 } 14363 output += "HAS_BOUNDS"; 14364 numFlags++; 14365 } 14366 14367 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 14368 if (numFlags > 0) { 14369 output += " "; 14370 } 14371 output += "DRAWN"; 14372 // USELESS HERE numFlags++; 14373 } 14374 return output; 14375 } 14376 14377 /** 14378 * <p>Indicates whether or not this view's layout will be requested during 14379 * the next hierarchy layout pass.</p> 14380 * 14381 * @return true if the layout will be forced during next layout pass 14382 */ 14383 public boolean isLayoutRequested() { 14384 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 14385 } 14386 14387 /** 14388 * Return true if o is a ViewGroup that is laying out using optical bounds. 14389 * @hide 14390 */ 14391 public static boolean isLayoutModeOptical(Object o) { 14392 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 14393 } 14394 14395 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 14396 Insets parentInsets = mParent instanceof View ? 14397 ((View) mParent).getOpticalInsets() : Insets.NONE; 14398 Insets childInsets = getOpticalInsets(); 14399 return setFrame( 14400 left + parentInsets.left - childInsets.left, 14401 top + parentInsets.top - childInsets.top, 14402 right + parentInsets.left + childInsets.right, 14403 bottom + parentInsets.top + childInsets.bottom); 14404 } 14405 14406 /** 14407 * Assign a size and position to a view and all of its 14408 * descendants 14409 * 14410 * <p>This is the second phase of the layout mechanism. 14411 * (The first is measuring). In this phase, each parent calls 14412 * layout on all of its children to position them. 14413 * This is typically done using the child measurements 14414 * that were stored in the measure pass().</p> 14415 * 14416 * <p>Derived classes should not override this method. 14417 * Derived classes with children should override 14418 * onLayout. In that method, they should 14419 * call layout on each of their children.</p> 14420 * 14421 * @param l Left position, relative to parent 14422 * @param t Top position, relative to parent 14423 * @param r Right position, relative to parent 14424 * @param b Bottom position, relative to parent 14425 */ 14426 @SuppressWarnings({"unchecked"}) 14427 public void layout(int l, int t, int r, int b) { 14428 if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) { 14429 onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec); 14430 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 14431 } 14432 14433 int oldL = mLeft; 14434 int oldT = mTop; 14435 int oldB = mBottom; 14436 int oldR = mRight; 14437 14438 boolean changed = isLayoutModeOptical(mParent) ? 14439 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14440 14441 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14442 onLayout(changed, l, t, r, b); 14443 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14444 14445 ListenerInfo li = mListenerInfo; 14446 if (li != null && li.mOnLayoutChangeListeners != null) { 14447 ArrayList<OnLayoutChangeListener> listenersCopy = 14448 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14449 int numListeners = listenersCopy.size(); 14450 for (int i = 0; i < numListeners; ++i) { 14451 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14452 } 14453 } 14454 } 14455 14456 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14457 mPrivateFlags3 |= PFLAG3_IS_LAID_OUT; 14458 } 14459 14460 /** 14461 * Called from layout when this view should 14462 * assign a size and position to each of its children. 14463 * 14464 * Derived classes with children should override 14465 * this method and call layout on each of 14466 * their children. 14467 * @param changed This is a new size or position for this view 14468 * @param left Left position, relative to parent 14469 * @param top Top position, relative to parent 14470 * @param right Right position, relative to parent 14471 * @param bottom Bottom position, relative to parent 14472 */ 14473 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14474 } 14475 14476 /** 14477 * Assign a size and position to this view. 14478 * 14479 * This is called from layout. 14480 * 14481 * @param left Left position, relative to parent 14482 * @param top Top position, relative to parent 14483 * @param right Right position, relative to parent 14484 * @param bottom Bottom position, relative to parent 14485 * @return true if the new size and position are different than the 14486 * previous ones 14487 * {@hide} 14488 */ 14489 protected boolean setFrame(int left, int top, int right, int bottom) { 14490 boolean changed = false; 14491 14492 if (DBG) { 14493 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14494 + right + "," + bottom + ")"); 14495 } 14496 14497 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14498 changed = true; 14499 14500 // Remember our drawn bit 14501 int drawn = mPrivateFlags & PFLAG_DRAWN; 14502 14503 int oldWidth = mRight - mLeft; 14504 int oldHeight = mBottom - mTop; 14505 int newWidth = right - left; 14506 int newHeight = bottom - top; 14507 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14508 14509 // Invalidate our old position 14510 invalidate(sizeChanged); 14511 14512 mLeft = left; 14513 mTop = top; 14514 mRight = right; 14515 mBottom = bottom; 14516 if (mDisplayList != null) { 14517 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14518 } 14519 14520 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14521 14522 14523 if (sizeChanged) { 14524 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14525 // A change in dimension means an auto-centered pivot point changes, too 14526 if (mTransformationInfo != null) { 14527 mTransformationInfo.mMatrixDirty = true; 14528 } 14529 } 14530 sizeChange(newWidth, newHeight, oldWidth, oldHeight); 14531 } 14532 14533 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14534 // If we are visible, force the DRAWN bit to on so that 14535 // this invalidate will go through (at least to our parent). 14536 // This is because someone may have invalidated this view 14537 // before this call to setFrame came in, thereby clearing 14538 // the DRAWN bit. 14539 mPrivateFlags |= PFLAG_DRAWN; 14540 invalidate(sizeChanged); 14541 // parent display list may need to be recreated based on a change in the bounds 14542 // of any child 14543 invalidateParentCaches(); 14544 } 14545 14546 // Reset drawn bit to original value (invalidate turns it off) 14547 mPrivateFlags |= drawn; 14548 14549 mBackgroundSizeChanged = true; 14550 14551 notifySubtreeAccessibilityStateChangedIfNeeded(); 14552 } 14553 return changed; 14554 } 14555 14556 private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { 14557 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14558 if (mOverlay != null) { 14559 mOverlay.getOverlayView().setRight(newWidth); 14560 mOverlay.getOverlayView().setBottom(newHeight); 14561 } 14562 } 14563 14564 /** 14565 * Finalize inflating a view from XML. This is called as the last phase 14566 * of inflation, after all child views have been added. 14567 * 14568 * <p>Even if the subclass overrides onFinishInflate, they should always be 14569 * sure to call the super method, so that we get called. 14570 */ 14571 protected void onFinishInflate() { 14572 } 14573 14574 /** 14575 * Returns the resources associated with this view. 14576 * 14577 * @return Resources object. 14578 */ 14579 public Resources getResources() { 14580 return mResources; 14581 } 14582 14583 /** 14584 * Invalidates the specified Drawable. 14585 * 14586 * @param drawable the drawable to invalidate 14587 */ 14588 public void invalidateDrawable(Drawable drawable) { 14589 if (verifyDrawable(drawable)) { 14590 final Rect dirty = drawable.getBounds(); 14591 final int scrollX = mScrollX; 14592 final int scrollY = mScrollY; 14593 14594 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14595 dirty.right + scrollX, dirty.bottom + scrollY); 14596 } 14597 } 14598 14599 /** 14600 * Schedules an action on a drawable to occur at a specified time. 14601 * 14602 * @param who the recipient of the action 14603 * @param what the action to run on the drawable 14604 * @param when the time at which the action must occur. Uses the 14605 * {@link SystemClock#uptimeMillis} timebase. 14606 */ 14607 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14608 if (verifyDrawable(who) && what != null) { 14609 final long delay = when - SystemClock.uptimeMillis(); 14610 if (mAttachInfo != null) { 14611 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14612 Choreographer.CALLBACK_ANIMATION, what, who, 14613 Choreographer.subtractFrameDelay(delay)); 14614 } else { 14615 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14616 } 14617 } 14618 } 14619 14620 /** 14621 * Cancels a scheduled action on a drawable. 14622 * 14623 * @param who the recipient of the action 14624 * @param what the action to cancel 14625 */ 14626 public void unscheduleDrawable(Drawable who, Runnable what) { 14627 if (verifyDrawable(who) && what != null) { 14628 if (mAttachInfo != null) { 14629 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14630 Choreographer.CALLBACK_ANIMATION, what, who); 14631 } else { 14632 ViewRootImpl.getRunQueue().removeCallbacks(what); 14633 } 14634 } 14635 } 14636 14637 /** 14638 * Unschedule any events associated with the given Drawable. This can be 14639 * used when selecting a new Drawable into a view, so that the previous 14640 * one is completely unscheduled. 14641 * 14642 * @param who The Drawable to unschedule. 14643 * 14644 * @see #drawableStateChanged 14645 */ 14646 public void unscheduleDrawable(Drawable who) { 14647 if (mAttachInfo != null && who != null) { 14648 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14649 Choreographer.CALLBACK_ANIMATION, null, who); 14650 } 14651 } 14652 14653 /** 14654 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 14655 * that the View directionality can and will be resolved before its Drawables. 14656 * 14657 * Will call {@link View#onResolveDrawables} when resolution is done. 14658 * 14659 * @hide 14660 */ 14661 protected void resolveDrawables() { 14662 if (canResolveLayoutDirection()) { 14663 if (mBackground != null) { 14664 mBackground.setLayoutDirection(getLayoutDirection()); 14665 } 14666 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 14667 onResolveDrawables(getLayoutDirection()); 14668 } 14669 } 14670 14671 /** 14672 * Called when layout direction has been resolved. 14673 * 14674 * The default implementation does nothing. 14675 * 14676 * @param layoutDirection The resolved layout direction. 14677 * 14678 * @see #LAYOUT_DIRECTION_LTR 14679 * @see #LAYOUT_DIRECTION_RTL 14680 * 14681 * @hide 14682 */ 14683 public void onResolveDrawables(int layoutDirection) { 14684 } 14685 14686 /** 14687 * @hide 14688 */ 14689 protected void resetResolvedDrawables() { 14690 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 14691 } 14692 14693 private boolean isDrawablesResolved() { 14694 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 14695 } 14696 14697 /** 14698 * If your view subclass is displaying its own Drawable objects, it should 14699 * override this function and return true for any Drawable it is 14700 * displaying. This allows animations for those drawables to be 14701 * scheduled. 14702 * 14703 * <p>Be sure to call through to the super class when overriding this 14704 * function. 14705 * 14706 * @param who The Drawable to verify. Return true if it is one you are 14707 * displaying, else return the result of calling through to the 14708 * super class. 14709 * 14710 * @return boolean If true than the Drawable is being displayed in the 14711 * view; else false and it is not allowed to animate. 14712 * 14713 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 14714 * @see #drawableStateChanged() 14715 */ 14716 protected boolean verifyDrawable(Drawable who) { 14717 return who == mBackground; 14718 } 14719 14720 /** 14721 * This function is called whenever the state of the view changes in such 14722 * a way that it impacts the state of drawables being shown. 14723 * 14724 * <p>Be sure to call through to the superclass when overriding this 14725 * function. 14726 * 14727 * @see Drawable#setState(int[]) 14728 */ 14729 protected void drawableStateChanged() { 14730 Drawable d = mBackground; 14731 if (d != null && d.isStateful()) { 14732 d.setState(getDrawableState()); 14733 } 14734 } 14735 14736 /** 14737 * Call this to force a view to update its drawable state. This will cause 14738 * drawableStateChanged to be called on this view. Views that are interested 14739 * in the new state should call getDrawableState. 14740 * 14741 * @see #drawableStateChanged 14742 * @see #getDrawableState 14743 */ 14744 public void refreshDrawableState() { 14745 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 14746 drawableStateChanged(); 14747 14748 ViewParent parent = mParent; 14749 if (parent != null) { 14750 parent.childDrawableStateChanged(this); 14751 } 14752 } 14753 14754 /** 14755 * Return an array of resource IDs of the drawable states representing the 14756 * current state of the view. 14757 * 14758 * @return The current drawable state 14759 * 14760 * @see Drawable#setState(int[]) 14761 * @see #drawableStateChanged() 14762 * @see #onCreateDrawableState(int) 14763 */ 14764 public final int[] getDrawableState() { 14765 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 14766 return mDrawableState; 14767 } else { 14768 mDrawableState = onCreateDrawableState(0); 14769 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 14770 return mDrawableState; 14771 } 14772 } 14773 14774 /** 14775 * Generate the new {@link android.graphics.drawable.Drawable} state for 14776 * this view. This is called by the view 14777 * system when the cached Drawable state is determined to be invalid. To 14778 * retrieve the current state, you should use {@link #getDrawableState}. 14779 * 14780 * @param extraSpace if non-zero, this is the number of extra entries you 14781 * would like in the returned array in which you can place your own 14782 * states. 14783 * 14784 * @return Returns an array holding the current {@link Drawable} state of 14785 * the view. 14786 * 14787 * @see #mergeDrawableStates(int[], int[]) 14788 */ 14789 protected int[] onCreateDrawableState(int extraSpace) { 14790 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 14791 mParent instanceof View) { 14792 return ((View) mParent).onCreateDrawableState(extraSpace); 14793 } 14794 14795 int[] drawableState; 14796 14797 int privateFlags = mPrivateFlags; 14798 14799 int viewStateIndex = 0; 14800 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 14801 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 14802 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 14803 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 14804 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 14805 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 14806 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 14807 HardwareRenderer.isAvailable()) { 14808 // This is set if HW acceleration is requested, even if the current 14809 // process doesn't allow it. This is just to allow app preview 14810 // windows to better match their app. 14811 viewStateIndex |= VIEW_STATE_ACCELERATED; 14812 } 14813 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 14814 14815 final int privateFlags2 = mPrivateFlags2; 14816 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 14817 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 14818 14819 drawableState = VIEW_STATE_SETS[viewStateIndex]; 14820 14821 //noinspection ConstantIfStatement 14822 if (false) { 14823 Log.i("View", "drawableStateIndex=" + viewStateIndex); 14824 Log.i("View", toString() 14825 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 14826 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 14827 + " fo=" + hasFocus() 14828 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 14829 + " wf=" + hasWindowFocus() 14830 + ": " + Arrays.toString(drawableState)); 14831 } 14832 14833 if (extraSpace == 0) { 14834 return drawableState; 14835 } 14836 14837 final int[] fullState; 14838 if (drawableState != null) { 14839 fullState = new int[drawableState.length + extraSpace]; 14840 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 14841 } else { 14842 fullState = new int[extraSpace]; 14843 } 14844 14845 return fullState; 14846 } 14847 14848 /** 14849 * Merge your own state values in <var>additionalState</var> into the base 14850 * state values <var>baseState</var> that were returned by 14851 * {@link #onCreateDrawableState(int)}. 14852 * 14853 * @param baseState The base state values returned by 14854 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 14855 * own additional state values. 14856 * 14857 * @param additionalState The additional state values you would like 14858 * added to <var>baseState</var>; this array is not modified. 14859 * 14860 * @return As a convenience, the <var>baseState</var> array you originally 14861 * passed into the function is returned. 14862 * 14863 * @see #onCreateDrawableState(int) 14864 */ 14865 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 14866 final int N = baseState.length; 14867 int i = N - 1; 14868 while (i >= 0 && baseState[i] == 0) { 14869 i--; 14870 } 14871 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 14872 return baseState; 14873 } 14874 14875 /** 14876 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 14877 * on all Drawable objects associated with this view. 14878 */ 14879 public void jumpDrawablesToCurrentState() { 14880 if (mBackground != null) { 14881 mBackground.jumpToCurrentState(); 14882 } 14883 } 14884 14885 /** 14886 * Sets the background color for this view. 14887 * @param color the color of the background 14888 */ 14889 @RemotableViewMethod 14890 public void setBackgroundColor(int color) { 14891 if (mBackground instanceof ColorDrawable) { 14892 ((ColorDrawable) mBackground.mutate()).setColor(color); 14893 computeOpaqueFlags(); 14894 mBackgroundResource = 0; 14895 } else { 14896 setBackground(new ColorDrawable(color)); 14897 } 14898 } 14899 14900 /** 14901 * Set the background to a given resource. The resource should refer to 14902 * a Drawable object or 0 to remove the background. 14903 * @param resid The identifier of the resource. 14904 * 14905 * @attr ref android.R.styleable#View_background 14906 */ 14907 @RemotableViewMethod 14908 public void setBackgroundResource(int resid) { 14909 if (resid != 0 && resid == mBackgroundResource) { 14910 return; 14911 } 14912 14913 Drawable d= null; 14914 if (resid != 0) { 14915 d = mResources.getDrawable(resid); 14916 } 14917 setBackground(d); 14918 14919 mBackgroundResource = resid; 14920 } 14921 14922 /** 14923 * Set the background to a given Drawable, or remove the background. If the 14924 * background has padding, this View's padding is set to the background's 14925 * padding. However, when a background is removed, this View's padding isn't 14926 * touched. If setting the padding is desired, please use 14927 * {@link #setPadding(int, int, int, int)}. 14928 * 14929 * @param background The Drawable to use as the background, or null to remove the 14930 * background 14931 */ 14932 public void setBackground(Drawable background) { 14933 //noinspection deprecation 14934 setBackgroundDrawable(background); 14935 } 14936 14937 /** 14938 * @deprecated use {@link #setBackground(Drawable)} instead 14939 */ 14940 @Deprecated 14941 public void setBackgroundDrawable(Drawable background) { 14942 computeOpaqueFlags(); 14943 14944 if (background == mBackground) { 14945 return; 14946 } 14947 14948 boolean requestLayout = false; 14949 14950 mBackgroundResource = 0; 14951 14952 /* 14953 * Regardless of whether we're setting a new background or not, we want 14954 * to clear the previous drawable. 14955 */ 14956 if (mBackground != null) { 14957 mBackground.setCallback(null); 14958 unscheduleDrawable(mBackground); 14959 } 14960 14961 if (background != null) { 14962 Rect padding = sThreadLocal.get(); 14963 if (padding == null) { 14964 padding = new Rect(); 14965 sThreadLocal.set(padding); 14966 } 14967 resetResolvedDrawables(); 14968 background.setLayoutDirection(getLayoutDirection()); 14969 if (background.getPadding(padding)) { 14970 resetResolvedPadding(); 14971 switch (background.getLayoutDirection()) { 14972 case LAYOUT_DIRECTION_RTL: 14973 mUserPaddingLeftInitial = padding.right; 14974 mUserPaddingRightInitial = padding.left; 14975 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 14976 break; 14977 case LAYOUT_DIRECTION_LTR: 14978 default: 14979 mUserPaddingLeftInitial = padding.left; 14980 mUserPaddingRightInitial = padding.right; 14981 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 14982 } 14983 } 14984 14985 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14986 // if it has a different minimum size, we should layout again 14987 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14988 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14989 requestLayout = true; 14990 } 14991 14992 background.setCallback(this); 14993 if (background.isStateful()) { 14994 background.setState(getDrawableState()); 14995 } 14996 background.setVisible(getVisibility() == VISIBLE, false); 14997 mBackground = background; 14998 14999 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 15000 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 15001 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 15002 requestLayout = true; 15003 } 15004 } else { 15005 /* Remove the background */ 15006 mBackground = null; 15007 15008 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 15009 /* 15010 * This view ONLY drew the background before and we're removing 15011 * the background, so now it won't draw anything 15012 * (hence we SKIP_DRAW) 15013 */ 15014 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 15015 mPrivateFlags |= PFLAG_SKIP_DRAW; 15016 } 15017 15018 /* 15019 * When the background is set, we try to apply its padding to this 15020 * View. When the background is removed, we don't touch this View's 15021 * padding. This is noted in the Javadocs. Hence, we don't need to 15022 * requestLayout(), the invalidate() below is sufficient. 15023 */ 15024 15025 // The old background's minimum size could have affected this 15026 // View's layout, so let's requestLayout 15027 requestLayout = true; 15028 } 15029 15030 computeOpaqueFlags(); 15031 15032 if (requestLayout) { 15033 requestLayout(); 15034 } 15035 15036 mBackgroundSizeChanged = true; 15037 invalidate(true); 15038 } 15039 15040 /** 15041 * Gets the background drawable 15042 * 15043 * @return The drawable used as the background for this view, if any. 15044 * 15045 * @see #setBackground(Drawable) 15046 * 15047 * @attr ref android.R.styleable#View_background 15048 */ 15049 public Drawable getBackground() { 15050 return mBackground; 15051 } 15052 15053 /** 15054 * Sets the padding. The view may add on the space required to display 15055 * the scrollbars, depending on the style and visibility of the scrollbars. 15056 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 15057 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 15058 * from the values set in this call. 15059 * 15060 * @attr ref android.R.styleable#View_padding 15061 * @attr ref android.R.styleable#View_paddingBottom 15062 * @attr ref android.R.styleable#View_paddingLeft 15063 * @attr ref android.R.styleable#View_paddingRight 15064 * @attr ref android.R.styleable#View_paddingTop 15065 * @param left the left padding in pixels 15066 * @param top the top padding in pixels 15067 * @param right the right padding in pixels 15068 * @param bottom the bottom padding in pixels 15069 */ 15070 public void setPadding(int left, int top, int right, int bottom) { 15071 resetResolvedPadding(); 15072 15073 mUserPaddingStart = UNDEFINED_PADDING; 15074 mUserPaddingEnd = UNDEFINED_PADDING; 15075 15076 mUserPaddingLeftInitial = left; 15077 mUserPaddingRightInitial = right; 15078 15079 internalSetPadding(left, top, right, bottom); 15080 } 15081 15082 /** 15083 * @hide 15084 */ 15085 protected void internalSetPadding(int left, int top, int right, int bottom) { 15086 mUserPaddingLeft = left; 15087 mUserPaddingRight = right; 15088 mUserPaddingBottom = bottom; 15089 15090 final int viewFlags = mViewFlags; 15091 boolean changed = false; 15092 15093 // Common case is there are no scroll bars. 15094 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 15095 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 15096 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 15097 ? 0 : getVerticalScrollbarWidth(); 15098 switch (mVerticalScrollbarPosition) { 15099 case SCROLLBAR_POSITION_DEFAULT: 15100 if (isLayoutRtl()) { 15101 left += offset; 15102 } else { 15103 right += offset; 15104 } 15105 break; 15106 case SCROLLBAR_POSITION_RIGHT: 15107 right += offset; 15108 break; 15109 case SCROLLBAR_POSITION_LEFT: 15110 left += offset; 15111 break; 15112 } 15113 } 15114 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 15115 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 15116 ? 0 : getHorizontalScrollbarHeight(); 15117 } 15118 } 15119 15120 if (mPaddingLeft != left) { 15121 changed = true; 15122 mPaddingLeft = left; 15123 } 15124 if (mPaddingTop != top) { 15125 changed = true; 15126 mPaddingTop = top; 15127 } 15128 if (mPaddingRight != right) { 15129 changed = true; 15130 mPaddingRight = right; 15131 } 15132 if (mPaddingBottom != bottom) { 15133 changed = true; 15134 mPaddingBottom = bottom; 15135 } 15136 15137 if (changed) { 15138 requestLayout(); 15139 } 15140 } 15141 15142 /** 15143 * Sets the relative padding. The view may add on the space required to display 15144 * the scrollbars, depending on the style and visibility of the scrollbars. 15145 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 15146 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 15147 * from the values set in this call. 15148 * 15149 * @attr ref android.R.styleable#View_padding 15150 * @attr ref android.R.styleable#View_paddingBottom 15151 * @attr ref android.R.styleable#View_paddingStart 15152 * @attr ref android.R.styleable#View_paddingEnd 15153 * @attr ref android.R.styleable#View_paddingTop 15154 * @param start the start padding in pixels 15155 * @param top the top padding in pixels 15156 * @param end the end padding in pixels 15157 * @param bottom the bottom padding in pixels 15158 */ 15159 public void setPaddingRelative(int start, int top, int end, int bottom) { 15160 resetResolvedPadding(); 15161 15162 mUserPaddingStart = start; 15163 mUserPaddingEnd = end; 15164 15165 switch(getLayoutDirection()) { 15166 case LAYOUT_DIRECTION_RTL: 15167 mUserPaddingLeftInitial = end; 15168 mUserPaddingRightInitial = start; 15169 internalSetPadding(end, top, start, bottom); 15170 break; 15171 case LAYOUT_DIRECTION_LTR: 15172 default: 15173 mUserPaddingLeftInitial = start; 15174 mUserPaddingRightInitial = end; 15175 internalSetPadding(start, top, end, bottom); 15176 } 15177 } 15178 15179 /** 15180 * Returns the top padding of this view. 15181 * 15182 * @return the top padding in pixels 15183 */ 15184 public int getPaddingTop() { 15185 return mPaddingTop; 15186 } 15187 15188 /** 15189 * Returns the bottom padding of this view. If there are inset and enabled 15190 * scrollbars, this value may include the space required to display the 15191 * scrollbars as well. 15192 * 15193 * @return the bottom padding in pixels 15194 */ 15195 public int getPaddingBottom() { 15196 return mPaddingBottom; 15197 } 15198 15199 /** 15200 * Returns the left padding of this view. If there are inset and enabled 15201 * scrollbars, this value may include the space required to display the 15202 * scrollbars as well. 15203 * 15204 * @return the left padding in pixels 15205 */ 15206 public int getPaddingLeft() { 15207 if (!isPaddingResolved()) { 15208 resolvePadding(); 15209 } 15210 return mPaddingLeft; 15211 } 15212 15213 /** 15214 * Returns the start padding of this view depending on its resolved layout direction. 15215 * If there are inset and enabled scrollbars, this value may include the space 15216 * required to display the scrollbars as well. 15217 * 15218 * @return the start padding in pixels 15219 */ 15220 public int getPaddingStart() { 15221 if (!isPaddingResolved()) { 15222 resolvePadding(); 15223 } 15224 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15225 mPaddingRight : mPaddingLeft; 15226 } 15227 15228 /** 15229 * Returns the right padding of this view. If there are inset and enabled 15230 * scrollbars, this value may include the space required to display the 15231 * scrollbars as well. 15232 * 15233 * @return the right padding in pixels 15234 */ 15235 public int getPaddingRight() { 15236 if (!isPaddingResolved()) { 15237 resolvePadding(); 15238 } 15239 return mPaddingRight; 15240 } 15241 15242 /** 15243 * Returns the end padding of this view depending on its resolved layout direction. 15244 * If there are inset and enabled scrollbars, this value may include the space 15245 * required to display the scrollbars as well. 15246 * 15247 * @return the end padding in pixels 15248 */ 15249 public int getPaddingEnd() { 15250 if (!isPaddingResolved()) { 15251 resolvePadding(); 15252 } 15253 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15254 mPaddingLeft : mPaddingRight; 15255 } 15256 15257 /** 15258 * Return if the padding as been set thru relative values 15259 * {@link #setPaddingRelative(int, int, int, int)} or thru 15260 * @attr ref android.R.styleable#View_paddingStart or 15261 * @attr ref android.R.styleable#View_paddingEnd 15262 * 15263 * @return true if the padding is relative or false if it is not. 15264 */ 15265 public boolean isPaddingRelative() { 15266 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 15267 } 15268 15269 Insets computeOpticalInsets() { 15270 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 15271 } 15272 15273 /** 15274 * @hide 15275 */ 15276 public void resetPaddingToInitialValues() { 15277 if (isRtlCompatibilityMode()) { 15278 mPaddingLeft = mUserPaddingLeftInitial; 15279 mPaddingRight = mUserPaddingRightInitial; 15280 return; 15281 } 15282 if (isLayoutRtl()) { 15283 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 15284 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 15285 } else { 15286 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 15287 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 15288 } 15289 } 15290 15291 /** 15292 * @hide 15293 */ 15294 public Insets getOpticalInsets() { 15295 if (mLayoutInsets == null) { 15296 mLayoutInsets = computeOpticalInsets(); 15297 } 15298 return mLayoutInsets; 15299 } 15300 15301 /** 15302 * Changes the selection state of this view. A view can be selected or not. 15303 * Note that selection is not the same as focus. Views are typically 15304 * selected in the context of an AdapterView like ListView or GridView; 15305 * the selected view is the view that is highlighted. 15306 * 15307 * @param selected true if the view must be selected, false otherwise 15308 */ 15309 public void setSelected(boolean selected) { 15310 //noinspection DoubleNegation 15311 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 15312 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 15313 if (!selected) resetPressedState(); 15314 invalidate(true); 15315 refreshDrawableState(); 15316 dispatchSetSelected(selected); 15317 notifyViewAccessibilityStateChangedIfNeeded(); 15318 } 15319 } 15320 15321 /** 15322 * Dispatch setSelected to all of this View's children. 15323 * 15324 * @see #setSelected(boolean) 15325 * 15326 * @param selected The new selected state 15327 */ 15328 protected void dispatchSetSelected(boolean selected) { 15329 } 15330 15331 /** 15332 * Indicates the selection state of this view. 15333 * 15334 * @return true if the view is selected, false otherwise 15335 */ 15336 @ViewDebug.ExportedProperty 15337 public boolean isSelected() { 15338 return (mPrivateFlags & PFLAG_SELECTED) != 0; 15339 } 15340 15341 /** 15342 * Changes the activated state of this view. A view can be activated or not. 15343 * Note that activation is not the same as selection. Selection is 15344 * a transient property, representing the view (hierarchy) the user is 15345 * currently interacting with. Activation is a longer-term state that the 15346 * user can move views in and out of. For example, in a list view with 15347 * single or multiple selection enabled, the views in the current selection 15348 * set are activated. (Um, yeah, we are deeply sorry about the terminology 15349 * here.) The activated state is propagated down to children of the view it 15350 * is set on. 15351 * 15352 * @param activated true if the view must be activated, false otherwise 15353 */ 15354 public void setActivated(boolean activated) { 15355 //noinspection DoubleNegation 15356 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 15357 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 15358 invalidate(true); 15359 refreshDrawableState(); 15360 dispatchSetActivated(activated); 15361 } 15362 } 15363 15364 /** 15365 * Dispatch setActivated to all of this View's children. 15366 * 15367 * @see #setActivated(boolean) 15368 * 15369 * @param activated The new activated state 15370 */ 15371 protected void dispatchSetActivated(boolean activated) { 15372 } 15373 15374 /** 15375 * Indicates the activation state of this view. 15376 * 15377 * @return true if the view is activated, false otherwise 15378 */ 15379 @ViewDebug.ExportedProperty 15380 public boolean isActivated() { 15381 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 15382 } 15383 15384 /** 15385 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 15386 * observer can be used to get notifications when global events, like 15387 * layout, happen. 15388 * 15389 * The returned ViewTreeObserver observer is not guaranteed to remain 15390 * valid for the lifetime of this View. If the caller of this method keeps 15391 * a long-lived reference to ViewTreeObserver, it should always check for 15392 * the return value of {@link ViewTreeObserver#isAlive()}. 15393 * 15394 * @return The ViewTreeObserver for this view's hierarchy. 15395 */ 15396 public ViewTreeObserver getViewTreeObserver() { 15397 if (mAttachInfo != null) { 15398 return mAttachInfo.mTreeObserver; 15399 } 15400 if (mFloatingTreeObserver == null) { 15401 mFloatingTreeObserver = new ViewTreeObserver(); 15402 } 15403 return mFloatingTreeObserver; 15404 } 15405 15406 /** 15407 * <p>Finds the topmost view in the current view hierarchy.</p> 15408 * 15409 * @return the topmost view containing this view 15410 */ 15411 public View getRootView() { 15412 if (mAttachInfo != null) { 15413 final View v = mAttachInfo.mRootView; 15414 if (v != null) { 15415 return v; 15416 } 15417 } 15418 15419 View parent = this; 15420 15421 while (parent.mParent != null && parent.mParent instanceof View) { 15422 parent = (View) parent.mParent; 15423 } 15424 15425 return parent; 15426 } 15427 15428 /** 15429 * Transforms a motion event from view-local coordinates to on-screen 15430 * coordinates. 15431 * 15432 * @param ev the view-local motion event 15433 * @return false if the transformation could not be applied 15434 * @hide 15435 */ 15436 public boolean toGlobalMotionEvent(MotionEvent ev) { 15437 final AttachInfo info = mAttachInfo; 15438 if (info == null) { 15439 return false; 15440 } 15441 15442 transformMotionEventToGlobal(ev); 15443 ev.offsetLocation(info.mWindowLeft, info.mWindowTop); 15444 return true; 15445 } 15446 15447 /** 15448 * Transforms a motion event from on-screen coordinates to view-local 15449 * coordinates. 15450 * 15451 * @param ev the on-screen motion event 15452 * @return false if the transformation could not be applied 15453 * @hide 15454 */ 15455 public boolean toLocalMotionEvent(MotionEvent ev) { 15456 final AttachInfo info = mAttachInfo; 15457 if (info == null) { 15458 return false; 15459 } 15460 15461 ev.offsetLocation(-info.mWindowLeft, -info.mWindowTop); 15462 transformMotionEventToLocal(ev); 15463 return true; 15464 } 15465 15466 /** 15467 * Recursive helper method that applies transformations in post-order. 15468 * 15469 * @param ev the on-screen motion event 15470 */ 15471 private void transformMotionEventToLocal(MotionEvent ev) { 15472 final ViewParent parent = mParent; 15473 if (parent instanceof View) { 15474 final View vp = (View) parent; 15475 vp.transformMotionEventToLocal(ev); 15476 ev.offsetLocation(vp.mScrollX, vp.mScrollY); 15477 } else if (parent instanceof ViewRootImpl) { 15478 final ViewRootImpl vr = (ViewRootImpl) parent; 15479 ev.offsetLocation(0, vr.mCurScrollY); 15480 } 15481 15482 ev.offsetLocation(-mLeft, -mTop); 15483 15484 if (!hasIdentityMatrix()) { 15485 ev.transform(getInverseMatrix()); 15486 } 15487 } 15488 15489 /** 15490 * Recursive helper method that applies transformations in pre-order. 15491 * 15492 * @param ev the on-screen motion event 15493 */ 15494 private void transformMotionEventToGlobal(MotionEvent ev) { 15495 if (!hasIdentityMatrix()) { 15496 ev.transform(getMatrix()); 15497 } 15498 15499 ev.offsetLocation(mLeft, mTop); 15500 15501 final ViewParent parent = mParent; 15502 if (parent instanceof View) { 15503 final View vp = (View) parent; 15504 ev.offsetLocation(-vp.mScrollX, -vp.mScrollY); 15505 vp.transformMotionEventToGlobal(ev); 15506 } else if (parent instanceof ViewRootImpl) { 15507 final ViewRootImpl vr = (ViewRootImpl) parent; 15508 ev.offsetLocation(0, -vr.mCurScrollY); 15509 } 15510 } 15511 15512 /** 15513 * <p>Computes the coordinates of this view on the screen. The argument 15514 * must be an array of two integers. After the method returns, the array 15515 * contains the x and y location in that order.</p> 15516 * 15517 * @param location an array of two integers in which to hold the coordinates 15518 */ 15519 public void getLocationOnScreen(int[] location) { 15520 getLocationInWindow(location); 15521 15522 final AttachInfo info = mAttachInfo; 15523 if (info != null) { 15524 location[0] += info.mWindowLeft; 15525 location[1] += info.mWindowTop; 15526 } 15527 } 15528 15529 /** 15530 * <p>Computes the coordinates of this view in its window. The argument 15531 * must be an array of two integers. After the method returns, the array 15532 * contains the x and y location in that order.</p> 15533 * 15534 * @param location an array of two integers in which to hold the coordinates 15535 */ 15536 public void getLocationInWindow(int[] location) { 15537 if (location == null || location.length < 2) { 15538 throw new IllegalArgumentException("location must be an array of two integers"); 15539 } 15540 15541 if (mAttachInfo == null) { 15542 // When the view is not attached to a window, this method does not make sense 15543 location[0] = location[1] = 0; 15544 return; 15545 } 15546 15547 float[] position = mAttachInfo.mTmpTransformLocation; 15548 position[0] = position[1] = 0.0f; 15549 15550 if (!hasIdentityMatrix()) { 15551 getMatrix().mapPoints(position); 15552 } 15553 15554 position[0] += mLeft; 15555 position[1] += mTop; 15556 15557 ViewParent viewParent = mParent; 15558 while (viewParent instanceof View) { 15559 final View view = (View) viewParent; 15560 15561 position[0] -= view.mScrollX; 15562 position[1] -= view.mScrollY; 15563 15564 if (!view.hasIdentityMatrix()) { 15565 view.getMatrix().mapPoints(position); 15566 } 15567 15568 position[0] += view.mLeft; 15569 position[1] += view.mTop; 15570 15571 viewParent = view.mParent; 15572 } 15573 15574 if (viewParent instanceof ViewRootImpl) { 15575 // *cough* 15576 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15577 position[1] -= vr.mCurScrollY; 15578 } 15579 15580 location[0] = (int) (position[0] + 0.5f); 15581 location[1] = (int) (position[1] + 0.5f); 15582 } 15583 15584 /** 15585 * {@hide} 15586 * @param id the id of the view to be found 15587 * @return the view of the specified id, null if cannot be found 15588 */ 15589 protected View findViewTraversal(int id) { 15590 if (id == mID) { 15591 return this; 15592 } 15593 return null; 15594 } 15595 15596 /** 15597 * {@hide} 15598 * @param tag the tag of the view to be found 15599 * @return the view of specified tag, null if cannot be found 15600 */ 15601 protected View findViewWithTagTraversal(Object tag) { 15602 if (tag != null && tag.equals(mTag)) { 15603 return this; 15604 } 15605 return null; 15606 } 15607 15608 /** 15609 * {@hide} 15610 * @param predicate The predicate to evaluate. 15611 * @param childToSkip If not null, ignores this child during the recursive traversal. 15612 * @return The first view that matches the predicate or null. 15613 */ 15614 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15615 if (predicate.apply(this)) { 15616 return this; 15617 } 15618 return null; 15619 } 15620 15621 /** 15622 * Look for a child view with the given id. If this view has the given 15623 * id, return this view. 15624 * 15625 * @param id The id to search for. 15626 * @return The view that has the given id in the hierarchy or null 15627 */ 15628 public final View findViewById(int id) { 15629 if (id < 0) { 15630 return null; 15631 } 15632 return findViewTraversal(id); 15633 } 15634 15635 /** 15636 * Finds a view by its unuque and stable accessibility id. 15637 * 15638 * @param accessibilityId The searched accessibility id. 15639 * @return The found view. 15640 */ 15641 final View findViewByAccessibilityId(int accessibilityId) { 15642 if (accessibilityId < 0) { 15643 return null; 15644 } 15645 return findViewByAccessibilityIdTraversal(accessibilityId); 15646 } 15647 15648 /** 15649 * Performs the traversal to find a view by its unuque and stable accessibility id. 15650 * 15651 * <strong>Note:</strong>This method does not stop at the root namespace 15652 * boundary since the user can touch the screen at an arbitrary location 15653 * potentially crossing the root namespace bounday which will send an 15654 * accessibility event to accessibility services and they should be able 15655 * to obtain the event source. Also accessibility ids are guaranteed to be 15656 * unique in the window. 15657 * 15658 * @param accessibilityId The accessibility id. 15659 * @return The found view. 15660 * 15661 * @hide 15662 */ 15663 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 15664 if (getAccessibilityViewId() == accessibilityId) { 15665 return this; 15666 } 15667 return null; 15668 } 15669 15670 /** 15671 * Look for a child view with the given tag. If this view has the given 15672 * tag, return this view. 15673 * 15674 * @param tag The tag to search for, using "tag.equals(getTag())". 15675 * @return The View that has the given tag in the hierarchy or null 15676 */ 15677 public final View findViewWithTag(Object tag) { 15678 if (tag == null) { 15679 return null; 15680 } 15681 return findViewWithTagTraversal(tag); 15682 } 15683 15684 /** 15685 * {@hide} 15686 * Look for a child view that matches the specified predicate. 15687 * If this view matches the predicate, return this view. 15688 * 15689 * @param predicate The predicate to evaluate. 15690 * @return The first view that matches the predicate or null. 15691 */ 15692 public final View findViewByPredicate(Predicate<View> predicate) { 15693 return findViewByPredicateTraversal(predicate, null); 15694 } 15695 15696 /** 15697 * {@hide} 15698 * Look for a child view that matches the specified predicate, 15699 * starting with the specified view and its descendents and then 15700 * recusively searching the ancestors and siblings of that view 15701 * until this view is reached. 15702 * 15703 * This method is useful in cases where the predicate does not match 15704 * a single unique view (perhaps multiple views use the same id) 15705 * and we are trying to find the view that is "closest" in scope to the 15706 * starting view. 15707 * 15708 * @param start The view to start from. 15709 * @param predicate The predicate to evaluate. 15710 * @return The first view that matches the predicate or null. 15711 */ 15712 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 15713 View childToSkip = null; 15714 for (;;) { 15715 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 15716 if (view != null || start == this) { 15717 return view; 15718 } 15719 15720 ViewParent parent = start.getParent(); 15721 if (parent == null || !(parent instanceof View)) { 15722 return null; 15723 } 15724 15725 childToSkip = start; 15726 start = (View) parent; 15727 } 15728 } 15729 15730 /** 15731 * Sets the identifier for this view. The identifier does not have to be 15732 * unique in this view's hierarchy. The identifier should be a positive 15733 * number. 15734 * 15735 * @see #NO_ID 15736 * @see #getId() 15737 * @see #findViewById(int) 15738 * 15739 * @param id a number used to identify the view 15740 * 15741 * @attr ref android.R.styleable#View_id 15742 */ 15743 public void setId(int id) { 15744 mID = id; 15745 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 15746 mID = generateViewId(); 15747 } 15748 } 15749 15750 /** 15751 * {@hide} 15752 * 15753 * @param isRoot true if the view belongs to the root namespace, false 15754 * otherwise 15755 */ 15756 public void setIsRootNamespace(boolean isRoot) { 15757 if (isRoot) { 15758 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 15759 } else { 15760 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 15761 } 15762 } 15763 15764 /** 15765 * {@hide} 15766 * 15767 * @return true if the view belongs to the root namespace, false otherwise 15768 */ 15769 public boolean isRootNamespace() { 15770 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 15771 } 15772 15773 /** 15774 * Returns this view's identifier. 15775 * 15776 * @return a positive integer used to identify the view or {@link #NO_ID} 15777 * if the view has no ID 15778 * 15779 * @see #setId(int) 15780 * @see #findViewById(int) 15781 * @attr ref android.R.styleable#View_id 15782 */ 15783 @ViewDebug.CapturedViewProperty 15784 public int getId() { 15785 return mID; 15786 } 15787 15788 /** 15789 * Returns this view's tag. 15790 * 15791 * @return the Object stored in this view as a tag 15792 * 15793 * @see #setTag(Object) 15794 * @see #getTag(int) 15795 */ 15796 @ViewDebug.ExportedProperty 15797 public Object getTag() { 15798 return mTag; 15799 } 15800 15801 /** 15802 * Sets the tag associated with this view. A tag can be used to mark 15803 * a view in its hierarchy and does not have to be unique within the 15804 * hierarchy. Tags can also be used to store data within a view without 15805 * resorting to another data structure. 15806 * 15807 * @param tag an Object to tag the view with 15808 * 15809 * @see #getTag() 15810 * @see #setTag(int, Object) 15811 */ 15812 public void setTag(final Object tag) { 15813 mTag = tag; 15814 } 15815 15816 /** 15817 * Returns the tag associated with this view and the specified key. 15818 * 15819 * @param key The key identifying the tag 15820 * 15821 * @return the Object stored in this view as a tag 15822 * 15823 * @see #setTag(int, Object) 15824 * @see #getTag() 15825 */ 15826 public Object getTag(int key) { 15827 if (mKeyedTags != null) return mKeyedTags.get(key); 15828 return null; 15829 } 15830 15831 /** 15832 * Sets a tag associated with this view and a key. A tag can be used 15833 * to mark a view in its hierarchy and does not have to be unique within 15834 * the hierarchy. Tags can also be used to store data within a view 15835 * without resorting to another data structure. 15836 * 15837 * The specified key should be an id declared in the resources of the 15838 * application to ensure it is unique (see the <a 15839 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 15840 * Keys identified as belonging to 15841 * the Android framework or not associated with any package will cause 15842 * an {@link IllegalArgumentException} to be thrown. 15843 * 15844 * @param key The key identifying the tag 15845 * @param tag An Object to tag the view with 15846 * 15847 * @throws IllegalArgumentException If they specified key is not valid 15848 * 15849 * @see #setTag(Object) 15850 * @see #getTag(int) 15851 */ 15852 public void setTag(int key, final Object tag) { 15853 // If the package id is 0x00 or 0x01, it's either an undefined package 15854 // or a framework id 15855 if ((key >>> 24) < 2) { 15856 throw new IllegalArgumentException("The key must be an application-specific " 15857 + "resource id."); 15858 } 15859 15860 setKeyedTag(key, tag); 15861 } 15862 15863 /** 15864 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 15865 * framework id. 15866 * 15867 * @hide 15868 */ 15869 public void setTagInternal(int key, Object tag) { 15870 if ((key >>> 24) != 0x1) { 15871 throw new IllegalArgumentException("The key must be a framework-specific " 15872 + "resource id."); 15873 } 15874 15875 setKeyedTag(key, tag); 15876 } 15877 15878 private void setKeyedTag(int key, Object tag) { 15879 if (mKeyedTags == null) { 15880 mKeyedTags = new SparseArray<Object>(2); 15881 } 15882 15883 mKeyedTags.put(key, tag); 15884 } 15885 15886 /** 15887 * Prints information about this view in the log output, with the tag 15888 * {@link #VIEW_LOG_TAG}. 15889 * 15890 * @hide 15891 */ 15892 public void debug() { 15893 debug(0); 15894 } 15895 15896 /** 15897 * Prints information about this view in the log output, with the tag 15898 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 15899 * indentation defined by the <code>depth</code>. 15900 * 15901 * @param depth the indentation level 15902 * 15903 * @hide 15904 */ 15905 protected void debug(int depth) { 15906 String output = debugIndent(depth - 1); 15907 15908 output += "+ " + this; 15909 int id = getId(); 15910 if (id != -1) { 15911 output += " (id=" + id + ")"; 15912 } 15913 Object tag = getTag(); 15914 if (tag != null) { 15915 output += " (tag=" + tag + ")"; 15916 } 15917 Log.d(VIEW_LOG_TAG, output); 15918 15919 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 15920 output = debugIndent(depth) + " FOCUSED"; 15921 Log.d(VIEW_LOG_TAG, output); 15922 } 15923 15924 output = debugIndent(depth); 15925 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 15926 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 15927 + "} "; 15928 Log.d(VIEW_LOG_TAG, output); 15929 15930 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 15931 || mPaddingBottom != 0) { 15932 output = debugIndent(depth); 15933 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 15934 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 15935 Log.d(VIEW_LOG_TAG, output); 15936 } 15937 15938 output = debugIndent(depth); 15939 output += "mMeasureWidth=" + mMeasuredWidth + 15940 " mMeasureHeight=" + mMeasuredHeight; 15941 Log.d(VIEW_LOG_TAG, output); 15942 15943 output = debugIndent(depth); 15944 if (mLayoutParams == null) { 15945 output += "BAD! no layout params"; 15946 } else { 15947 output = mLayoutParams.debug(output); 15948 } 15949 Log.d(VIEW_LOG_TAG, output); 15950 15951 output = debugIndent(depth); 15952 output += "flags={"; 15953 output += View.printFlags(mViewFlags); 15954 output += "}"; 15955 Log.d(VIEW_LOG_TAG, output); 15956 15957 output = debugIndent(depth); 15958 output += "privateFlags={"; 15959 output += View.printPrivateFlags(mPrivateFlags); 15960 output += "}"; 15961 Log.d(VIEW_LOG_TAG, output); 15962 } 15963 15964 /** 15965 * Creates a string of whitespaces used for indentation. 15966 * 15967 * @param depth the indentation level 15968 * @return a String containing (depth * 2 + 3) * 2 white spaces 15969 * 15970 * @hide 15971 */ 15972 protected static String debugIndent(int depth) { 15973 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 15974 for (int i = 0; i < (depth * 2) + 3; i++) { 15975 spaces.append(' ').append(' '); 15976 } 15977 return spaces.toString(); 15978 } 15979 15980 /** 15981 * <p>Return the offset of the widget's text baseline from the widget's top 15982 * boundary. If this widget does not support baseline alignment, this 15983 * method returns -1. </p> 15984 * 15985 * @return the offset of the baseline within the widget's bounds or -1 15986 * if baseline alignment is not supported 15987 */ 15988 @ViewDebug.ExportedProperty(category = "layout") 15989 public int getBaseline() { 15990 return -1; 15991 } 15992 15993 /** 15994 * Returns whether the view hierarchy is currently undergoing a layout pass. This 15995 * information is useful to avoid situations such as calling {@link #requestLayout()} during 15996 * a layout pass. 15997 * 15998 * @return whether the view hierarchy is currently undergoing a layout pass 15999 */ 16000 public boolean isInLayout() { 16001 ViewRootImpl viewRoot = getViewRootImpl(); 16002 return (viewRoot != null && viewRoot.isInLayout()); 16003 } 16004 16005 /** 16006 * Call this when something has changed which has invalidated the 16007 * layout of this view. This will schedule a layout pass of the view 16008 * tree. This should not be called while the view hierarchy is currently in a layout 16009 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 16010 * end of the current layout pass (and then layout will run again) or after the current 16011 * frame is drawn and the next layout occurs. 16012 * 16013 * <p>Subclasses which override this method should call the superclass method to 16014 * handle possible request-during-layout errors correctly.</p> 16015 */ 16016 public void requestLayout() { 16017 if (mMeasureCache != null) mMeasureCache.clear(); 16018 16019 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 16020 // Only trigger request-during-layout logic if this is the view requesting it, 16021 // not the views in its parent hierarchy 16022 ViewRootImpl viewRoot = getViewRootImpl(); 16023 if (viewRoot != null && viewRoot.isInLayout()) { 16024 if (!viewRoot.requestLayoutDuringLayout(this)) { 16025 return; 16026 } 16027 } 16028 mAttachInfo.mViewRequestingLayout = this; 16029 } 16030 16031 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 16032 mPrivateFlags |= PFLAG_INVALIDATED; 16033 16034 if (mParent != null && !mParent.isLayoutRequested()) { 16035 mParent.requestLayout(); 16036 } 16037 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 16038 mAttachInfo.mViewRequestingLayout = null; 16039 } 16040 } 16041 16042 /** 16043 * Forces this view to be laid out during the next layout pass. 16044 * This method does not call requestLayout() or forceLayout() 16045 * on the parent. 16046 */ 16047 public void forceLayout() { 16048 if (mMeasureCache != null) mMeasureCache.clear(); 16049 16050 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 16051 mPrivateFlags |= PFLAG_INVALIDATED; 16052 } 16053 16054 /** 16055 * <p> 16056 * This is called to find out how big a view should be. The parent 16057 * supplies constraint information in the width and height parameters. 16058 * </p> 16059 * 16060 * <p> 16061 * The actual measurement work of a view is performed in 16062 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 16063 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 16064 * </p> 16065 * 16066 * 16067 * @param widthMeasureSpec Horizontal space requirements as imposed by the 16068 * parent 16069 * @param heightMeasureSpec Vertical space requirements as imposed by the 16070 * parent 16071 * 16072 * @see #onMeasure(int, int) 16073 */ 16074 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 16075 boolean optical = isLayoutModeOptical(this); 16076 if (optical != isLayoutModeOptical(mParent)) { 16077 Insets insets = getOpticalInsets(); 16078 int oWidth = insets.left + insets.right; 16079 int oHeight = insets.top + insets.bottom; 16080 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 16081 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 16082 } 16083 16084 // Suppress sign extension for the low bytes 16085 long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL; 16086 if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2); 16087 16088 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 16089 widthMeasureSpec != mOldWidthMeasureSpec || 16090 heightMeasureSpec != mOldHeightMeasureSpec) { 16091 16092 // first clears the measured dimension flag 16093 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 16094 16095 resolveRtlPropertiesIfNeeded(); 16096 16097 int cacheIndex = (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT ? -1 : 16098 mMeasureCache.indexOfKey(key); 16099 if (cacheIndex < 0) { 16100 // measure ourselves, this should set the measured dimension flag back 16101 onMeasure(widthMeasureSpec, heightMeasureSpec); 16102 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16103 } else { 16104 long value = mMeasureCache.valueAt(cacheIndex); 16105 // Casting a long to int drops the high 32 bits, no mask needed 16106 setMeasuredDimension((int) (value >> 32), (int) value); 16107 mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16108 } 16109 16110 // flag not set, setMeasuredDimension() was not invoked, we raise 16111 // an exception to warn the developer 16112 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 16113 throw new IllegalStateException("onMeasure() did not set the" 16114 + " measured dimension by calling" 16115 + " setMeasuredDimension()"); 16116 } 16117 16118 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 16119 } 16120 16121 mOldWidthMeasureSpec = widthMeasureSpec; 16122 mOldHeightMeasureSpec = heightMeasureSpec; 16123 16124 mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 | 16125 (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension 16126 } 16127 16128 /** 16129 * <p> 16130 * Measure the view and its content to determine the measured width and the 16131 * measured height. This method is invoked by {@link #measure(int, int)} and 16132 * should be overriden by subclasses to provide accurate and efficient 16133 * measurement of their contents. 16134 * </p> 16135 * 16136 * <p> 16137 * <strong>CONTRACT:</strong> When overriding this method, you 16138 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 16139 * measured width and height of this view. Failure to do so will trigger an 16140 * <code>IllegalStateException</code>, thrown by 16141 * {@link #measure(int, int)}. Calling the superclass' 16142 * {@link #onMeasure(int, int)} is a valid use. 16143 * </p> 16144 * 16145 * <p> 16146 * The base class implementation of measure defaults to the background size, 16147 * unless a larger size is allowed by the MeasureSpec. Subclasses should 16148 * override {@link #onMeasure(int, int)} to provide better measurements of 16149 * their content. 16150 * </p> 16151 * 16152 * <p> 16153 * If this method is overridden, it is the subclass's responsibility to make 16154 * sure the measured height and width are at least the view's minimum height 16155 * and width ({@link #getSuggestedMinimumHeight()} and 16156 * {@link #getSuggestedMinimumWidth()}). 16157 * </p> 16158 * 16159 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 16160 * The requirements are encoded with 16161 * {@link android.view.View.MeasureSpec}. 16162 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 16163 * The requirements are encoded with 16164 * {@link android.view.View.MeasureSpec}. 16165 * 16166 * @see #getMeasuredWidth() 16167 * @see #getMeasuredHeight() 16168 * @see #setMeasuredDimension(int, int) 16169 * @see #getSuggestedMinimumHeight() 16170 * @see #getSuggestedMinimumWidth() 16171 * @see android.view.View.MeasureSpec#getMode(int) 16172 * @see android.view.View.MeasureSpec#getSize(int) 16173 */ 16174 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 16175 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 16176 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 16177 } 16178 16179 /** 16180 * <p>This method must be called by {@link #onMeasure(int, int)} to store the 16181 * measured width and measured height. Failing to do so will trigger an 16182 * exception at measurement time.</p> 16183 * 16184 * @param measuredWidth The measured width of this view. May be a complex 16185 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16186 * {@link #MEASURED_STATE_TOO_SMALL}. 16187 * @param measuredHeight The measured height of this view. May be a complex 16188 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16189 * {@link #MEASURED_STATE_TOO_SMALL}. 16190 */ 16191 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 16192 boolean optical = isLayoutModeOptical(this); 16193 if (optical != isLayoutModeOptical(mParent)) { 16194 Insets insets = getOpticalInsets(); 16195 int opticalWidth = insets.left + insets.right; 16196 int opticalHeight = insets.top + insets.bottom; 16197 16198 measuredWidth += optical ? opticalWidth : -opticalWidth; 16199 measuredHeight += optical ? opticalHeight : -opticalHeight; 16200 } 16201 mMeasuredWidth = measuredWidth; 16202 mMeasuredHeight = measuredHeight; 16203 16204 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 16205 } 16206 16207 /** 16208 * Merge two states as returned by {@link #getMeasuredState()}. 16209 * @param curState The current state as returned from a view or the result 16210 * of combining multiple views. 16211 * @param newState The new view state to combine. 16212 * @return Returns a new integer reflecting the combination of the two 16213 * states. 16214 */ 16215 public static int combineMeasuredStates(int curState, int newState) { 16216 return curState | newState; 16217 } 16218 16219 /** 16220 * Version of {@link #resolveSizeAndState(int, int, int)} 16221 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 16222 */ 16223 public static int resolveSize(int size, int measureSpec) { 16224 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 16225 } 16226 16227 /** 16228 * Utility to reconcile a desired size and state, with constraints imposed 16229 * by a MeasureSpec. Will take the desired size, unless a different size 16230 * is imposed by the constraints. The returned value is a compound integer, 16231 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 16232 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 16233 * size is smaller than the size the view wants to be. 16234 * 16235 * @param size How big the view wants to be 16236 * @param measureSpec Constraints imposed by the parent 16237 * @return Size information bit mask as defined by 16238 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 16239 */ 16240 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 16241 int result = size; 16242 int specMode = MeasureSpec.getMode(measureSpec); 16243 int specSize = MeasureSpec.getSize(measureSpec); 16244 switch (specMode) { 16245 case MeasureSpec.UNSPECIFIED: 16246 result = size; 16247 break; 16248 case MeasureSpec.AT_MOST: 16249 if (specSize < size) { 16250 result = specSize | MEASURED_STATE_TOO_SMALL; 16251 } else { 16252 result = size; 16253 } 16254 break; 16255 case MeasureSpec.EXACTLY: 16256 result = specSize; 16257 break; 16258 } 16259 return result | (childMeasuredState&MEASURED_STATE_MASK); 16260 } 16261 16262 /** 16263 * Utility to return a default size. Uses the supplied size if the 16264 * MeasureSpec imposed no constraints. Will get larger if allowed 16265 * by the MeasureSpec. 16266 * 16267 * @param size Default size for this view 16268 * @param measureSpec Constraints imposed by the parent 16269 * @return The size this view should be. 16270 */ 16271 public static int getDefaultSize(int size, int measureSpec) { 16272 int result = size; 16273 int specMode = MeasureSpec.getMode(measureSpec); 16274 int specSize = MeasureSpec.getSize(measureSpec); 16275 16276 switch (specMode) { 16277 case MeasureSpec.UNSPECIFIED: 16278 result = size; 16279 break; 16280 case MeasureSpec.AT_MOST: 16281 case MeasureSpec.EXACTLY: 16282 result = specSize; 16283 break; 16284 } 16285 return result; 16286 } 16287 16288 /** 16289 * Returns the suggested minimum height that the view should use. This 16290 * returns the maximum of the view's minimum height 16291 * and the background's minimum height 16292 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 16293 * <p> 16294 * When being used in {@link #onMeasure(int, int)}, the caller should still 16295 * ensure the returned height is within the requirements of the parent. 16296 * 16297 * @return The suggested minimum height of the view. 16298 */ 16299 protected int getSuggestedMinimumHeight() { 16300 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 16301 16302 } 16303 16304 /** 16305 * Returns the suggested minimum width that the view should use. This 16306 * returns the maximum of the view's minimum width) 16307 * and the background's minimum width 16308 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 16309 * <p> 16310 * When being used in {@link #onMeasure(int, int)}, the caller should still 16311 * ensure the returned width is within the requirements of the parent. 16312 * 16313 * @return The suggested minimum width of the view. 16314 */ 16315 protected int getSuggestedMinimumWidth() { 16316 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 16317 } 16318 16319 /** 16320 * Returns the minimum height of the view. 16321 * 16322 * @return the minimum height the view will try to be. 16323 * 16324 * @see #setMinimumHeight(int) 16325 * 16326 * @attr ref android.R.styleable#View_minHeight 16327 */ 16328 public int getMinimumHeight() { 16329 return mMinHeight; 16330 } 16331 16332 /** 16333 * Sets the minimum height of the view. It is not guaranteed the view will 16334 * be able to achieve this minimum height (for example, if its parent layout 16335 * constrains it with less available height). 16336 * 16337 * @param minHeight The minimum height the view will try to be. 16338 * 16339 * @see #getMinimumHeight() 16340 * 16341 * @attr ref android.R.styleable#View_minHeight 16342 */ 16343 public void setMinimumHeight(int minHeight) { 16344 mMinHeight = minHeight; 16345 requestLayout(); 16346 } 16347 16348 /** 16349 * Returns the minimum width of the view. 16350 * 16351 * @return the minimum width the view will try to be. 16352 * 16353 * @see #setMinimumWidth(int) 16354 * 16355 * @attr ref android.R.styleable#View_minWidth 16356 */ 16357 public int getMinimumWidth() { 16358 return mMinWidth; 16359 } 16360 16361 /** 16362 * Sets the minimum width of the view. It is not guaranteed the view will 16363 * be able to achieve this minimum width (for example, if its parent layout 16364 * constrains it with less available width). 16365 * 16366 * @param minWidth The minimum width the view will try to be. 16367 * 16368 * @see #getMinimumWidth() 16369 * 16370 * @attr ref android.R.styleable#View_minWidth 16371 */ 16372 public void setMinimumWidth(int minWidth) { 16373 mMinWidth = minWidth; 16374 requestLayout(); 16375 16376 } 16377 16378 /** 16379 * Get the animation currently associated with this view. 16380 * 16381 * @return The animation that is currently playing or 16382 * scheduled to play for this view. 16383 */ 16384 public Animation getAnimation() { 16385 return mCurrentAnimation; 16386 } 16387 16388 /** 16389 * Start the specified animation now. 16390 * 16391 * @param animation the animation to start now 16392 */ 16393 public void startAnimation(Animation animation) { 16394 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 16395 setAnimation(animation); 16396 invalidateParentCaches(); 16397 invalidate(true); 16398 } 16399 16400 /** 16401 * Cancels any animations for this view. 16402 */ 16403 public void clearAnimation() { 16404 if (mCurrentAnimation != null) { 16405 mCurrentAnimation.detach(); 16406 } 16407 mCurrentAnimation = null; 16408 invalidateParentIfNeeded(); 16409 } 16410 16411 /** 16412 * Sets the next animation to play for this view. 16413 * If you want the animation to play immediately, use 16414 * {@link #startAnimation(android.view.animation.Animation)} instead. 16415 * This method provides allows fine-grained 16416 * control over the start time and invalidation, but you 16417 * must make sure that 1) the animation has a start time set, and 16418 * 2) the view's parent (which controls animations on its children) 16419 * will be invalidated when the animation is supposed to 16420 * start. 16421 * 16422 * @param animation The next animation, or null. 16423 */ 16424 public void setAnimation(Animation animation) { 16425 mCurrentAnimation = animation; 16426 16427 if (animation != null) { 16428 // If the screen is off assume the animation start time is now instead of 16429 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 16430 // would cause the animation to start when the screen turns back on 16431 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 16432 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 16433 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 16434 } 16435 animation.reset(); 16436 } 16437 } 16438 16439 /** 16440 * Invoked by a parent ViewGroup to notify the start of the animation 16441 * currently associated with this view. If you override this method, 16442 * always call super.onAnimationStart(); 16443 * 16444 * @see #setAnimation(android.view.animation.Animation) 16445 * @see #getAnimation() 16446 */ 16447 protected void onAnimationStart() { 16448 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 16449 } 16450 16451 /** 16452 * Invoked by a parent ViewGroup to notify the end of the animation 16453 * currently associated with this view. If you override this method, 16454 * always call super.onAnimationEnd(); 16455 * 16456 * @see #setAnimation(android.view.animation.Animation) 16457 * @see #getAnimation() 16458 */ 16459 protected void onAnimationEnd() { 16460 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 16461 } 16462 16463 /** 16464 * Invoked if there is a Transform that involves alpha. Subclass that can 16465 * draw themselves with the specified alpha should return true, and then 16466 * respect that alpha when their onDraw() is called. If this returns false 16467 * then the view may be redirected to draw into an offscreen buffer to 16468 * fulfill the request, which will look fine, but may be slower than if the 16469 * subclass handles it internally. The default implementation returns false. 16470 * 16471 * @param alpha The alpha (0..255) to apply to the view's drawing 16472 * @return true if the view can draw with the specified alpha. 16473 */ 16474 protected boolean onSetAlpha(int alpha) { 16475 return false; 16476 } 16477 16478 /** 16479 * This is used by the RootView to perform an optimization when 16480 * the view hierarchy contains one or several SurfaceView. 16481 * SurfaceView is always considered transparent, but its children are not, 16482 * therefore all View objects remove themselves from the global transparent 16483 * region (passed as a parameter to this function). 16484 * 16485 * @param region The transparent region for this ViewAncestor (window). 16486 * 16487 * @return Returns true if the effective visibility of the view at this 16488 * point is opaque, regardless of the transparent region; returns false 16489 * if it is possible for underlying windows to be seen behind the view. 16490 * 16491 * {@hide} 16492 */ 16493 public boolean gatherTransparentRegion(Region region) { 16494 final AttachInfo attachInfo = mAttachInfo; 16495 if (region != null && attachInfo != null) { 16496 final int pflags = mPrivateFlags; 16497 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 16498 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 16499 // remove it from the transparent region. 16500 final int[] location = attachInfo.mTransparentLocation; 16501 getLocationInWindow(location); 16502 region.op(location[0], location[1], location[0] + mRight - mLeft, 16503 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 16504 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 16505 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 16506 // exists, so we remove the background drawable's non-transparent 16507 // parts from this transparent region. 16508 applyDrawableToTransparentRegion(mBackground, region); 16509 } 16510 } 16511 return true; 16512 } 16513 16514 /** 16515 * Play a sound effect for this view. 16516 * 16517 * <p>The framework will play sound effects for some built in actions, such as 16518 * clicking, but you may wish to play these effects in your widget, 16519 * for instance, for internal navigation. 16520 * 16521 * <p>The sound effect will only be played if sound effects are enabled by the user, and 16522 * {@link #isSoundEffectsEnabled()} is true. 16523 * 16524 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 16525 */ 16526 public void playSoundEffect(int soundConstant) { 16527 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 16528 return; 16529 } 16530 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 16531 } 16532 16533 /** 16534 * BZZZTT!!1! 16535 * 16536 * <p>Provide haptic feedback to the user for this view. 16537 * 16538 * <p>The framework will provide haptic feedback for some built in actions, 16539 * such as long presses, but you may wish to provide feedback for your 16540 * own widget. 16541 * 16542 * <p>The feedback will only be performed if 16543 * {@link #isHapticFeedbackEnabled()} is true. 16544 * 16545 * @param feedbackConstant One of the constants defined in 16546 * {@link HapticFeedbackConstants} 16547 */ 16548 public boolean performHapticFeedback(int feedbackConstant) { 16549 return performHapticFeedback(feedbackConstant, 0); 16550 } 16551 16552 /** 16553 * BZZZTT!!1! 16554 * 16555 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 16556 * 16557 * @param feedbackConstant One of the constants defined in 16558 * {@link HapticFeedbackConstants} 16559 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 16560 */ 16561 public boolean performHapticFeedback(int feedbackConstant, int flags) { 16562 if (mAttachInfo == null) { 16563 return false; 16564 } 16565 //noinspection SimplifiableIfStatement 16566 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 16567 && !isHapticFeedbackEnabled()) { 16568 return false; 16569 } 16570 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 16571 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 16572 } 16573 16574 /** 16575 * Request that the visibility of the status bar or other screen/window 16576 * decorations be changed. 16577 * 16578 * <p>This method is used to put the over device UI into temporary modes 16579 * where the user's attention is focused more on the application content, 16580 * by dimming or hiding surrounding system affordances. This is typically 16581 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16582 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16583 * to be placed behind the action bar (and with these flags other system 16584 * affordances) so that smooth transitions between hiding and showing them 16585 * can be done. 16586 * 16587 * <p>Two representative examples of the use of system UI visibility is 16588 * implementing a content browsing application (like a magazine reader) 16589 * and a video playing application. 16590 * 16591 * <p>The first code shows a typical implementation of a View in a content 16592 * browsing application. In this implementation, the application goes 16593 * into a content-oriented mode by hiding the status bar and action bar, 16594 * and putting the navigation elements into lights out mode. The user can 16595 * then interact with content while in this mode. Such an application should 16596 * provide an easy way for the user to toggle out of the mode (such as to 16597 * check information in the status bar or access notifications). In the 16598 * implementation here, this is done simply by tapping on the content. 16599 * 16600 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16601 * content} 16602 * 16603 * <p>This second code sample shows a typical implementation of a View 16604 * in a video playing application. In this situation, while the video is 16605 * playing the application would like to go into a complete full-screen mode, 16606 * to use as much of the display as possible for the video. When in this state 16607 * the user can not interact with the application; the system intercepts 16608 * touching on the screen to pop the UI out of full screen mode. See 16609 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16610 * 16611 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16612 * content} 16613 * 16614 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16615 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16616 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16617 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16618 */ 16619 public void setSystemUiVisibility(int visibility) { 16620 if (visibility != mSystemUiVisibility) { 16621 mSystemUiVisibility = visibility; 16622 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16623 mParent.recomputeViewAttributes(this); 16624 } 16625 } 16626 } 16627 16628 /** 16629 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 16630 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16631 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16632 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16633 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16634 */ 16635 public int getSystemUiVisibility() { 16636 return mSystemUiVisibility; 16637 } 16638 16639 /** 16640 * Returns the current system UI visibility that is currently set for 16641 * the entire window. This is the combination of the 16642 * {@link #setSystemUiVisibility(int)} values supplied by all of the 16643 * views in the window. 16644 */ 16645 public int getWindowSystemUiVisibility() { 16646 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 16647 } 16648 16649 /** 16650 * Override to find out when the window's requested system UI visibility 16651 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 16652 * This is different from the callbacks received through 16653 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 16654 * in that this is only telling you about the local request of the window, 16655 * not the actual values applied by the system. 16656 */ 16657 public void onWindowSystemUiVisibilityChanged(int visible) { 16658 } 16659 16660 /** 16661 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 16662 * the view hierarchy. 16663 */ 16664 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 16665 onWindowSystemUiVisibilityChanged(visible); 16666 } 16667 16668 /** 16669 * Set a listener to receive callbacks when the visibility of the system bar changes. 16670 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 16671 */ 16672 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 16673 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 16674 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16675 mParent.recomputeViewAttributes(this); 16676 } 16677 } 16678 16679 /** 16680 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 16681 * the view hierarchy. 16682 */ 16683 public void dispatchSystemUiVisibilityChanged(int visibility) { 16684 ListenerInfo li = mListenerInfo; 16685 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 16686 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 16687 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 16688 } 16689 } 16690 16691 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 16692 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 16693 if (val != mSystemUiVisibility) { 16694 setSystemUiVisibility(val); 16695 return true; 16696 } 16697 return false; 16698 } 16699 16700 /** @hide */ 16701 public void setDisabledSystemUiVisibility(int flags) { 16702 if (mAttachInfo != null) { 16703 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 16704 mAttachInfo.mDisabledSystemUiVisibility = flags; 16705 if (mParent != null) { 16706 mParent.recomputeViewAttributes(this); 16707 } 16708 } 16709 } 16710 } 16711 16712 /** 16713 * Creates an image that the system displays during the drag and drop 16714 * operation. This is called a "drag shadow". The default implementation 16715 * for a DragShadowBuilder based on a View returns an image that has exactly the same 16716 * appearance as the given View. The default also positions the center of the drag shadow 16717 * directly under the touch point. If no View is provided (the constructor with no parameters 16718 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 16719 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 16720 * default is an invisible drag shadow. 16721 * <p> 16722 * You are not required to use the View you provide to the constructor as the basis of the 16723 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 16724 * anything you want as the drag shadow. 16725 * </p> 16726 * <p> 16727 * You pass a DragShadowBuilder object to the system when you start the drag. The system 16728 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 16729 * size and position of the drag shadow. It uses this data to construct a 16730 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 16731 * so that your application can draw the shadow image in the Canvas. 16732 * </p> 16733 * 16734 * <div class="special reference"> 16735 * <h3>Developer Guides</h3> 16736 * <p>For a guide to implementing drag and drop features, read the 16737 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16738 * </div> 16739 */ 16740 public static class DragShadowBuilder { 16741 private final WeakReference<View> mView; 16742 16743 /** 16744 * Constructs a shadow image builder based on a View. By default, the resulting drag 16745 * shadow will have the same appearance and dimensions as the View, with the touch point 16746 * over the center of the View. 16747 * @param view A View. Any View in scope can be used. 16748 */ 16749 public DragShadowBuilder(View view) { 16750 mView = new WeakReference<View>(view); 16751 } 16752 16753 /** 16754 * Construct a shadow builder object with no associated View. This 16755 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 16756 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 16757 * to supply the drag shadow's dimensions and appearance without 16758 * reference to any View object. If they are not overridden, then the result is an 16759 * invisible drag shadow. 16760 */ 16761 public DragShadowBuilder() { 16762 mView = new WeakReference<View>(null); 16763 } 16764 16765 /** 16766 * Returns the View object that had been passed to the 16767 * {@link #View.DragShadowBuilder(View)} 16768 * constructor. If that View parameter was {@code null} or if the 16769 * {@link #View.DragShadowBuilder()} 16770 * constructor was used to instantiate the builder object, this method will return 16771 * null. 16772 * 16773 * @return The View object associate with this builder object. 16774 */ 16775 @SuppressWarnings({"JavadocReference"}) 16776 final public View getView() { 16777 return mView.get(); 16778 } 16779 16780 /** 16781 * Provides the metrics for the shadow image. These include the dimensions of 16782 * the shadow image, and the point within that shadow that should 16783 * be centered under the touch location while dragging. 16784 * <p> 16785 * The default implementation sets the dimensions of the shadow to be the 16786 * same as the dimensions of the View itself and centers the shadow under 16787 * the touch point. 16788 * </p> 16789 * 16790 * @param shadowSize A {@link android.graphics.Point} containing the width and height 16791 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 16792 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 16793 * image. 16794 * 16795 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 16796 * shadow image that should be underneath the touch point during the drag and drop 16797 * operation. Your application must set {@link android.graphics.Point#x} to the 16798 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 16799 */ 16800 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 16801 final View view = mView.get(); 16802 if (view != null) { 16803 shadowSize.set(view.getWidth(), view.getHeight()); 16804 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 16805 } else { 16806 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 16807 } 16808 } 16809 16810 /** 16811 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 16812 * based on the dimensions it received from the 16813 * {@link #onProvideShadowMetrics(Point, Point)} callback. 16814 * 16815 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 16816 */ 16817 public void onDrawShadow(Canvas canvas) { 16818 final View view = mView.get(); 16819 if (view != null) { 16820 view.draw(canvas); 16821 } else { 16822 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 16823 } 16824 } 16825 } 16826 16827 /** 16828 * Starts a drag and drop operation. When your application calls this method, it passes a 16829 * {@link android.view.View.DragShadowBuilder} object to the system. The 16830 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 16831 * to get metrics for the drag shadow, and then calls the object's 16832 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 16833 * <p> 16834 * Once the system has the drag shadow, it begins the drag and drop operation by sending 16835 * drag events to all the View objects in your application that are currently visible. It does 16836 * this either by calling the View object's drag listener (an implementation of 16837 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 16838 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 16839 * Both are passed a {@link android.view.DragEvent} object that has a 16840 * {@link android.view.DragEvent#getAction()} value of 16841 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 16842 * </p> 16843 * <p> 16844 * Your application can invoke startDrag() on any attached View object. The View object does not 16845 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 16846 * be related to the View the user selected for dragging. 16847 * </p> 16848 * @param data A {@link android.content.ClipData} object pointing to the data to be 16849 * transferred by the drag and drop operation. 16850 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 16851 * drag shadow. 16852 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 16853 * drop operation. This Object is put into every DragEvent object sent by the system during the 16854 * current drag. 16855 * <p> 16856 * myLocalState is a lightweight mechanism for the sending information from the dragged View 16857 * to the target Views. For example, it can contain flags that differentiate between a 16858 * a copy operation and a move operation. 16859 * </p> 16860 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 16861 * so the parameter should be set to 0. 16862 * @return {@code true} if the method completes successfully, or 16863 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 16864 * do a drag, and so no drag operation is in progress. 16865 */ 16866 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 16867 Object myLocalState, int flags) { 16868 if (ViewDebug.DEBUG_DRAG) { 16869 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 16870 } 16871 boolean okay = false; 16872 16873 Point shadowSize = new Point(); 16874 Point shadowTouchPoint = new Point(); 16875 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 16876 16877 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 16878 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 16879 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 16880 } 16881 16882 if (ViewDebug.DEBUG_DRAG) { 16883 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 16884 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 16885 } 16886 Surface surface = new Surface(); 16887 try { 16888 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 16889 flags, shadowSize.x, shadowSize.y, surface); 16890 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 16891 + " surface=" + surface); 16892 if (token != null) { 16893 Canvas canvas = surface.lockCanvas(null); 16894 try { 16895 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 16896 shadowBuilder.onDrawShadow(canvas); 16897 } finally { 16898 surface.unlockCanvasAndPost(canvas); 16899 } 16900 16901 final ViewRootImpl root = getViewRootImpl(); 16902 16903 // Cache the local state object for delivery with DragEvents 16904 root.setLocalDragState(myLocalState); 16905 16906 // repurpose 'shadowSize' for the last touch point 16907 root.getLastTouchPoint(shadowSize); 16908 16909 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 16910 shadowSize.x, shadowSize.y, 16911 shadowTouchPoint.x, shadowTouchPoint.y, data); 16912 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 16913 16914 // Off and running! Release our local surface instance; the drag 16915 // shadow surface is now managed by the system process. 16916 surface.release(); 16917 } 16918 } catch (Exception e) { 16919 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 16920 surface.destroy(); 16921 } 16922 16923 return okay; 16924 } 16925 16926 /** 16927 * Handles drag events sent by the system following a call to 16928 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 16929 *<p> 16930 * When the system calls this method, it passes a 16931 * {@link android.view.DragEvent} object. A call to 16932 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 16933 * in DragEvent. The method uses these to determine what is happening in the drag and drop 16934 * operation. 16935 * @param event The {@link android.view.DragEvent} sent by the system. 16936 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 16937 * in DragEvent, indicating the type of drag event represented by this object. 16938 * @return {@code true} if the method was successful, otherwise {@code false}. 16939 * <p> 16940 * The method should return {@code true} in response to an action type of 16941 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 16942 * operation. 16943 * </p> 16944 * <p> 16945 * The method should also return {@code true} in response to an action type of 16946 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 16947 * {@code false} if it didn't. 16948 * </p> 16949 */ 16950 public boolean onDragEvent(DragEvent event) { 16951 return false; 16952 } 16953 16954 /** 16955 * Detects if this View is enabled and has a drag event listener. 16956 * If both are true, then it calls the drag event listener with the 16957 * {@link android.view.DragEvent} it received. If the drag event listener returns 16958 * {@code true}, then dispatchDragEvent() returns {@code true}. 16959 * <p> 16960 * For all other cases, the method calls the 16961 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 16962 * method and returns its result. 16963 * </p> 16964 * <p> 16965 * This ensures that a drag event is always consumed, even if the View does not have a drag 16966 * event listener. However, if the View has a listener and the listener returns true, then 16967 * onDragEvent() is not called. 16968 * </p> 16969 */ 16970 public boolean dispatchDragEvent(DragEvent event) { 16971 ListenerInfo li = mListenerInfo; 16972 //noinspection SimplifiableIfStatement 16973 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 16974 && li.mOnDragListener.onDrag(this, event)) { 16975 return true; 16976 } 16977 return onDragEvent(event); 16978 } 16979 16980 boolean canAcceptDrag() { 16981 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 16982 } 16983 16984 /** 16985 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 16986 * it is ever exposed at all. 16987 * @hide 16988 */ 16989 public void onCloseSystemDialogs(String reason) { 16990 } 16991 16992 /** 16993 * Given a Drawable whose bounds have been set to draw into this view, 16994 * update a Region being computed for 16995 * {@link #gatherTransparentRegion(android.graphics.Region)} so 16996 * that any non-transparent parts of the Drawable are removed from the 16997 * given transparent region. 16998 * 16999 * @param dr The Drawable whose transparency is to be applied to the region. 17000 * @param region A Region holding the current transparency information, 17001 * where any parts of the region that are set are considered to be 17002 * transparent. On return, this region will be modified to have the 17003 * transparency information reduced by the corresponding parts of the 17004 * Drawable that are not transparent. 17005 * {@hide} 17006 */ 17007 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 17008 if (DBG) { 17009 Log.i("View", "Getting transparent region for: " + this); 17010 } 17011 final Region r = dr.getTransparentRegion(); 17012 final Rect db = dr.getBounds(); 17013 final AttachInfo attachInfo = mAttachInfo; 17014 if (r != null && attachInfo != null) { 17015 final int w = getRight()-getLeft(); 17016 final int h = getBottom()-getTop(); 17017 if (db.left > 0) { 17018 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 17019 r.op(0, 0, db.left, h, Region.Op.UNION); 17020 } 17021 if (db.right < w) { 17022 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 17023 r.op(db.right, 0, w, h, Region.Op.UNION); 17024 } 17025 if (db.top > 0) { 17026 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 17027 r.op(0, 0, w, db.top, Region.Op.UNION); 17028 } 17029 if (db.bottom < h) { 17030 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 17031 r.op(0, db.bottom, w, h, Region.Op.UNION); 17032 } 17033 final int[] location = attachInfo.mTransparentLocation; 17034 getLocationInWindow(location); 17035 r.translate(location[0], location[1]); 17036 region.op(r, Region.Op.INTERSECT); 17037 } else { 17038 region.op(db, Region.Op.DIFFERENCE); 17039 } 17040 } 17041 17042 private void checkForLongClick(int delayOffset) { 17043 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 17044 mHasPerformedLongPress = false; 17045 17046 if (mPendingCheckForLongPress == null) { 17047 mPendingCheckForLongPress = new CheckForLongPress(); 17048 } 17049 mPendingCheckForLongPress.rememberWindowAttachCount(); 17050 postDelayed(mPendingCheckForLongPress, 17051 ViewConfiguration.getLongPressTimeout() - delayOffset); 17052 } 17053 } 17054 17055 /** 17056 * Inflate a view from an XML resource. This convenience method wraps the {@link 17057 * LayoutInflater} class, which provides a full range of options for view inflation. 17058 * 17059 * @param context The Context object for your activity or application. 17060 * @param resource The resource ID to inflate 17061 * @param root A view group that will be the parent. Used to properly inflate the 17062 * layout_* parameters. 17063 * @see LayoutInflater 17064 */ 17065 public static View inflate(Context context, int resource, ViewGroup root) { 17066 LayoutInflater factory = LayoutInflater.from(context); 17067 return factory.inflate(resource, root); 17068 } 17069 17070 /** 17071 * Scroll the view with standard behavior for scrolling beyond the normal 17072 * content boundaries. Views that call this method should override 17073 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 17074 * results of an over-scroll operation. 17075 * 17076 * Views can use this method to handle any touch or fling-based scrolling. 17077 * 17078 * @param deltaX Change in X in pixels 17079 * @param deltaY Change in Y in pixels 17080 * @param scrollX Current X scroll value in pixels before applying deltaX 17081 * @param scrollY Current Y scroll value in pixels before applying deltaY 17082 * @param scrollRangeX Maximum content scroll range along the X axis 17083 * @param scrollRangeY Maximum content scroll range along the Y axis 17084 * @param maxOverScrollX Number of pixels to overscroll by in either direction 17085 * along the X axis. 17086 * @param maxOverScrollY Number of pixels to overscroll by in either direction 17087 * along the Y axis. 17088 * @param isTouchEvent true if this scroll operation is the result of a touch event. 17089 * @return true if scrolling was clamped to an over-scroll boundary along either 17090 * axis, false otherwise. 17091 */ 17092 @SuppressWarnings({"UnusedParameters"}) 17093 protected boolean overScrollBy(int deltaX, int deltaY, 17094 int scrollX, int scrollY, 17095 int scrollRangeX, int scrollRangeY, 17096 int maxOverScrollX, int maxOverScrollY, 17097 boolean isTouchEvent) { 17098 final int overScrollMode = mOverScrollMode; 17099 final boolean canScrollHorizontal = 17100 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 17101 final boolean canScrollVertical = 17102 computeVerticalScrollRange() > computeVerticalScrollExtent(); 17103 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 17104 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 17105 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 17106 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 17107 17108 int newScrollX = scrollX + deltaX; 17109 if (!overScrollHorizontal) { 17110 maxOverScrollX = 0; 17111 } 17112 17113 int newScrollY = scrollY + deltaY; 17114 if (!overScrollVertical) { 17115 maxOverScrollY = 0; 17116 } 17117 17118 // Clamp values if at the limits and record 17119 final int left = -maxOverScrollX; 17120 final int right = maxOverScrollX + scrollRangeX; 17121 final int top = -maxOverScrollY; 17122 final int bottom = maxOverScrollY + scrollRangeY; 17123 17124 boolean clampedX = false; 17125 if (newScrollX > right) { 17126 newScrollX = right; 17127 clampedX = true; 17128 } else if (newScrollX < left) { 17129 newScrollX = left; 17130 clampedX = true; 17131 } 17132 17133 boolean clampedY = false; 17134 if (newScrollY > bottom) { 17135 newScrollY = bottom; 17136 clampedY = true; 17137 } else if (newScrollY < top) { 17138 newScrollY = top; 17139 clampedY = true; 17140 } 17141 17142 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 17143 17144 return clampedX || clampedY; 17145 } 17146 17147 /** 17148 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 17149 * respond to the results of an over-scroll operation. 17150 * 17151 * @param scrollX New X scroll value in pixels 17152 * @param scrollY New Y scroll value in pixels 17153 * @param clampedX True if scrollX was clamped to an over-scroll boundary 17154 * @param clampedY True if scrollY was clamped to an over-scroll boundary 17155 */ 17156 protected void onOverScrolled(int scrollX, int scrollY, 17157 boolean clampedX, boolean clampedY) { 17158 // Intentionally empty. 17159 } 17160 17161 /** 17162 * Returns the over-scroll mode for this view. The result will be 17163 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17164 * (allow over-scrolling only if the view content is larger than the container), 17165 * or {@link #OVER_SCROLL_NEVER}. 17166 * 17167 * @return This view's over-scroll mode. 17168 */ 17169 public int getOverScrollMode() { 17170 return mOverScrollMode; 17171 } 17172 17173 /** 17174 * Set the over-scroll mode for this view. Valid over-scroll modes are 17175 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17176 * (allow over-scrolling only if the view content is larger than the container), 17177 * or {@link #OVER_SCROLL_NEVER}. 17178 * 17179 * Setting the over-scroll mode of a view will have an effect only if the 17180 * view is capable of scrolling. 17181 * 17182 * @param overScrollMode The new over-scroll mode for this view. 17183 */ 17184 public void setOverScrollMode(int overScrollMode) { 17185 if (overScrollMode != OVER_SCROLL_ALWAYS && 17186 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 17187 overScrollMode != OVER_SCROLL_NEVER) { 17188 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 17189 } 17190 mOverScrollMode = overScrollMode; 17191 } 17192 17193 /** 17194 * Gets a scale factor that determines the distance the view should scroll 17195 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 17196 * @return The vertical scroll scale factor. 17197 * @hide 17198 */ 17199 protected float getVerticalScrollFactor() { 17200 if (mVerticalScrollFactor == 0) { 17201 TypedValue outValue = new TypedValue(); 17202 if (!mContext.getTheme().resolveAttribute( 17203 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 17204 throw new IllegalStateException( 17205 "Expected theme to define listPreferredItemHeight."); 17206 } 17207 mVerticalScrollFactor = outValue.getDimension( 17208 mContext.getResources().getDisplayMetrics()); 17209 } 17210 return mVerticalScrollFactor; 17211 } 17212 17213 /** 17214 * Gets a scale factor that determines the distance the view should scroll 17215 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 17216 * @return The horizontal scroll scale factor. 17217 * @hide 17218 */ 17219 protected float getHorizontalScrollFactor() { 17220 // TODO: Should use something else. 17221 return getVerticalScrollFactor(); 17222 } 17223 17224 /** 17225 * Return the value specifying the text direction or policy that was set with 17226 * {@link #setTextDirection(int)}. 17227 * 17228 * @return the defined text direction. It can be one of: 17229 * 17230 * {@link #TEXT_DIRECTION_INHERIT}, 17231 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17232 * {@link #TEXT_DIRECTION_ANY_RTL}, 17233 * {@link #TEXT_DIRECTION_LTR}, 17234 * {@link #TEXT_DIRECTION_RTL}, 17235 * {@link #TEXT_DIRECTION_LOCALE} 17236 * 17237 * @attr ref android.R.styleable#View_textDirection 17238 * 17239 * @hide 17240 */ 17241 @ViewDebug.ExportedProperty(category = "text", mapping = { 17242 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17243 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17244 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17245 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17246 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17247 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17248 }) 17249 public int getRawTextDirection() { 17250 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 17251 } 17252 17253 /** 17254 * Set the text direction. 17255 * 17256 * @param textDirection the direction to set. Should be one of: 17257 * 17258 * {@link #TEXT_DIRECTION_INHERIT}, 17259 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17260 * {@link #TEXT_DIRECTION_ANY_RTL}, 17261 * {@link #TEXT_DIRECTION_LTR}, 17262 * {@link #TEXT_DIRECTION_RTL}, 17263 * {@link #TEXT_DIRECTION_LOCALE} 17264 * 17265 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 17266 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 17267 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 17268 * 17269 * @attr ref android.R.styleable#View_textDirection 17270 */ 17271 public void setTextDirection(int textDirection) { 17272 if (getRawTextDirection() != textDirection) { 17273 // Reset the current text direction and the resolved one 17274 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 17275 resetResolvedTextDirection(); 17276 // Set the new text direction 17277 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 17278 // Do resolution 17279 resolveTextDirection(); 17280 // Notify change 17281 onRtlPropertiesChanged(getLayoutDirection()); 17282 // Refresh 17283 requestLayout(); 17284 invalidate(true); 17285 } 17286 } 17287 17288 /** 17289 * Return the resolved text direction. 17290 * 17291 * @return the resolved text direction. Returns one of: 17292 * 17293 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17294 * {@link #TEXT_DIRECTION_ANY_RTL}, 17295 * {@link #TEXT_DIRECTION_LTR}, 17296 * {@link #TEXT_DIRECTION_RTL}, 17297 * {@link #TEXT_DIRECTION_LOCALE} 17298 * 17299 * @attr ref android.R.styleable#View_textDirection 17300 */ 17301 @ViewDebug.ExportedProperty(category = "text", mapping = { 17302 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17303 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17304 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17305 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17306 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17307 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17308 }) 17309 public int getTextDirection() { 17310 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 17311 } 17312 17313 /** 17314 * Resolve the text direction. 17315 * 17316 * @return true if resolution has been done, false otherwise. 17317 * 17318 * @hide 17319 */ 17320 public boolean resolveTextDirection() { 17321 // Reset any previous text direction resolution 17322 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17323 17324 if (hasRtlSupport()) { 17325 // Set resolved text direction flag depending on text direction flag 17326 final int textDirection = getRawTextDirection(); 17327 switch(textDirection) { 17328 case TEXT_DIRECTION_INHERIT: 17329 if (!canResolveTextDirection()) { 17330 // We cannot do the resolution if there is no parent, so use the default one 17331 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17332 // Resolution will need to happen again later 17333 return false; 17334 } 17335 17336 // Parent has not yet resolved, so we still return the default 17337 try { 17338 if (!mParent.isTextDirectionResolved()) { 17339 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17340 // Resolution will need to happen again later 17341 return false; 17342 } 17343 } catch (AbstractMethodError e) { 17344 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17345 " does not fully implement ViewParent", e); 17346 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED | 17347 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17348 return true; 17349 } 17350 17351 // Set current resolved direction to the same value as the parent's one 17352 int parentResolvedDirection; 17353 try { 17354 parentResolvedDirection = mParent.getTextDirection(); 17355 } catch (AbstractMethodError e) { 17356 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17357 " does not fully implement ViewParent", e); 17358 parentResolvedDirection = TEXT_DIRECTION_LTR; 17359 } 17360 switch (parentResolvedDirection) { 17361 case TEXT_DIRECTION_FIRST_STRONG: 17362 case TEXT_DIRECTION_ANY_RTL: 17363 case TEXT_DIRECTION_LTR: 17364 case TEXT_DIRECTION_RTL: 17365 case TEXT_DIRECTION_LOCALE: 17366 mPrivateFlags2 |= 17367 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17368 break; 17369 default: 17370 // Default resolved direction is "first strong" heuristic 17371 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17372 } 17373 break; 17374 case TEXT_DIRECTION_FIRST_STRONG: 17375 case TEXT_DIRECTION_ANY_RTL: 17376 case TEXT_DIRECTION_LTR: 17377 case TEXT_DIRECTION_RTL: 17378 case TEXT_DIRECTION_LOCALE: 17379 // Resolved direction is the same as text direction 17380 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17381 break; 17382 default: 17383 // Default resolved direction is "first strong" heuristic 17384 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17385 } 17386 } else { 17387 // Default resolved direction is "first strong" heuristic 17388 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17389 } 17390 17391 // Set to resolved 17392 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 17393 return true; 17394 } 17395 17396 /** 17397 * Check if text direction resolution can be done. 17398 * 17399 * @return true if text direction resolution can be done otherwise return false. 17400 */ 17401 public boolean canResolveTextDirection() { 17402 switch (getRawTextDirection()) { 17403 case TEXT_DIRECTION_INHERIT: 17404 if (mParent != null) { 17405 try { 17406 return mParent.canResolveTextDirection(); 17407 } catch (AbstractMethodError e) { 17408 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17409 " does not fully implement ViewParent", e); 17410 } 17411 } 17412 return false; 17413 17414 default: 17415 return true; 17416 } 17417 } 17418 17419 /** 17420 * Reset resolved text direction. Text direction will be resolved during a call to 17421 * {@link #onMeasure(int, int)}. 17422 * 17423 * @hide 17424 */ 17425 public void resetResolvedTextDirection() { 17426 // Reset any previous text direction resolution 17427 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17428 // Set to default value 17429 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17430 } 17431 17432 /** 17433 * @return true if text direction is inherited. 17434 * 17435 * @hide 17436 */ 17437 public boolean isTextDirectionInherited() { 17438 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 17439 } 17440 17441 /** 17442 * @return true if text direction is resolved. 17443 */ 17444 public boolean isTextDirectionResolved() { 17445 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 17446 } 17447 17448 /** 17449 * Return the value specifying the text alignment or policy that was set with 17450 * {@link #setTextAlignment(int)}. 17451 * 17452 * @return the defined text alignment. It can be one of: 17453 * 17454 * {@link #TEXT_ALIGNMENT_INHERIT}, 17455 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17456 * {@link #TEXT_ALIGNMENT_CENTER}, 17457 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17458 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17459 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17460 * {@link #TEXT_ALIGNMENT_VIEW_END} 17461 * 17462 * @attr ref android.R.styleable#View_textAlignment 17463 * 17464 * @hide 17465 */ 17466 @ViewDebug.ExportedProperty(category = "text", mapping = { 17467 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17468 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17469 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17470 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17471 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17472 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17473 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17474 }) 17475 public int getRawTextAlignment() { 17476 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 17477 } 17478 17479 /** 17480 * Set the text alignment. 17481 * 17482 * @param textAlignment The text alignment to set. Should be one of 17483 * 17484 * {@link #TEXT_ALIGNMENT_INHERIT}, 17485 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17486 * {@link #TEXT_ALIGNMENT_CENTER}, 17487 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17488 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17489 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17490 * {@link #TEXT_ALIGNMENT_VIEW_END} 17491 * 17492 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 17493 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 17494 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 17495 * 17496 * @attr ref android.R.styleable#View_textAlignment 17497 */ 17498 public void setTextAlignment(int textAlignment) { 17499 if (textAlignment != getRawTextAlignment()) { 17500 // Reset the current and resolved text alignment 17501 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 17502 resetResolvedTextAlignment(); 17503 // Set the new text alignment 17504 mPrivateFlags2 |= 17505 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 17506 // Do resolution 17507 resolveTextAlignment(); 17508 // Notify change 17509 onRtlPropertiesChanged(getLayoutDirection()); 17510 // Refresh 17511 requestLayout(); 17512 invalidate(true); 17513 } 17514 } 17515 17516 /** 17517 * Return the resolved text alignment. 17518 * 17519 * @return the resolved text alignment. Returns one of: 17520 * 17521 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17522 * {@link #TEXT_ALIGNMENT_CENTER}, 17523 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17524 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17525 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17526 * {@link #TEXT_ALIGNMENT_VIEW_END} 17527 * 17528 * @attr ref android.R.styleable#View_textAlignment 17529 */ 17530 @ViewDebug.ExportedProperty(category = "text", mapping = { 17531 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17532 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17533 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17534 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17535 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17536 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17537 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17538 }) 17539 public int getTextAlignment() { 17540 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 17541 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 17542 } 17543 17544 /** 17545 * Resolve the text alignment. 17546 * 17547 * @return true if resolution has been done, false otherwise. 17548 * 17549 * @hide 17550 */ 17551 public boolean resolveTextAlignment() { 17552 // Reset any previous text alignment resolution 17553 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17554 17555 if (hasRtlSupport()) { 17556 // Set resolved text alignment flag depending on text alignment flag 17557 final int textAlignment = getRawTextAlignment(); 17558 switch (textAlignment) { 17559 case TEXT_ALIGNMENT_INHERIT: 17560 // Check if we can resolve the text alignment 17561 if (!canResolveTextAlignment()) { 17562 // We cannot do the resolution if there is no parent so use the default 17563 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17564 // Resolution will need to happen again later 17565 return false; 17566 } 17567 17568 // Parent has not yet resolved, so we still return the default 17569 try { 17570 if (!mParent.isTextAlignmentResolved()) { 17571 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17572 // Resolution will need to happen again later 17573 return false; 17574 } 17575 } catch (AbstractMethodError e) { 17576 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17577 " does not fully implement ViewParent", e); 17578 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED | 17579 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17580 return true; 17581 } 17582 17583 int parentResolvedTextAlignment; 17584 try { 17585 parentResolvedTextAlignment = mParent.getTextAlignment(); 17586 } catch (AbstractMethodError e) { 17587 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17588 " does not fully implement ViewParent", e); 17589 parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY; 17590 } 17591 switch (parentResolvedTextAlignment) { 17592 case TEXT_ALIGNMENT_GRAVITY: 17593 case TEXT_ALIGNMENT_TEXT_START: 17594 case TEXT_ALIGNMENT_TEXT_END: 17595 case TEXT_ALIGNMENT_CENTER: 17596 case TEXT_ALIGNMENT_VIEW_START: 17597 case TEXT_ALIGNMENT_VIEW_END: 17598 // Resolved text alignment is the same as the parent resolved 17599 // text alignment 17600 mPrivateFlags2 |= 17601 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17602 break; 17603 default: 17604 // Use default resolved text alignment 17605 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17606 } 17607 break; 17608 case TEXT_ALIGNMENT_GRAVITY: 17609 case TEXT_ALIGNMENT_TEXT_START: 17610 case TEXT_ALIGNMENT_TEXT_END: 17611 case TEXT_ALIGNMENT_CENTER: 17612 case TEXT_ALIGNMENT_VIEW_START: 17613 case TEXT_ALIGNMENT_VIEW_END: 17614 // Resolved text alignment is the same as text alignment 17615 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17616 break; 17617 default: 17618 // Use default resolved text alignment 17619 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17620 } 17621 } else { 17622 // Use default resolved text alignment 17623 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17624 } 17625 17626 // Set the resolved 17627 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17628 return true; 17629 } 17630 17631 /** 17632 * Check if text alignment resolution can be done. 17633 * 17634 * @return true if text alignment resolution can be done otherwise return false. 17635 */ 17636 public boolean canResolveTextAlignment() { 17637 switch (getRawTextAlignment()) { 17638 case TEXT_DIRECTION_INHERIT: 17639 if (mParent != null) { 17640 try { 17641 return mParent.canResolveTextAlignment(); 17642 } catch (AbstractMethodError e) { 17643 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17644 " does not fully implement ViewParent", e); 17645 } 17646 } 17647 return false; 17648 17649 default: 17650 return true; 17651 } 17652 } 17653 17654 /** 17655 * Reset resolved text alignment. Text alignment will be resolved during a call to 17656 * {@link #onMeasure(int, int)}. 17657 * 17658 * @hide 17659 */ 17660 public void resetResolvedTextAlignment() { 17661 // Reset any previous text alignment resolution 17662 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17663 // Set to default 17664 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17665 } 17666 17667 /** 17668 * @return true if text alignment is inherited. 17669 * 17670 * @hide 17671 */ 17672 public boolean isTextAlignmentInherited() { 17673 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 17674 } 17675 17676 /** 17677 * @return true if text alignment is resolved. 17678 */ 17679 public boolean isTextAlignmentResolved() { 17680 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17681 } 17682 17683 /** 17684 * Generate a value suitable for use in {@link #setId(int)}. 17685 * This value will not collide with ID values generated at build time by aapt for R.id. 17686 * 17687 * @return a generated ID value 17688 */ 17689 public static int generateViewId() { 17690 for (;;) { 17691 final int result = sNextGeneratedId.get(); 17692 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 17693 int newValue = result + 1; 17694 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 17695 if (sNextGeneratedId.compareAndSet(result, newValue)) { 17696 return result; 17697 } 17698 } 17699 } 17700 17701 // 17702 // Properties 17703 // 17704 /** 17705 * A Property wrapper around the <code>alpha</code> functionality handled by the 17706 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 17707 */ 17708 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 17709 @Override 17710 public void setValue(View object, float value) { 17711 object.setAlpha(value); 17712 } 17713 17714 @Override 17715 public Float get(View object) { 17716 return object.getAlpha(); 17717 } 17718 }; 17719 17720 /** 17721 * A Property wrapper around the <code>translationX</code> functionality handled by the 17722 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 17723 */ 17724 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 17725 @Override 17726 public void setValue(View object, float value) { 17727 object.setTranslationX(value); 17728 } 17729 17730 @Override 17731 public Float get(View object) { 17732 return object.getTranslationX(); 17733 } 17734 }; 17735 17736 /** 17737 * A Property wrapper around the <code>translationY</code> functionality handled by the 17738 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 17739 */ 17740 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 17741 @Override 17742 public void setValue(View object, float value) { 17743 object.setTranslationY(value); 17744 } 17745 17746 @Override 17747 public Float get(View object) { 17748 return object.getTranslationY(); 17749 } 17750 }; 17751 17752 /** 17753 * A Property wrapper around the <code>x</code> functionality handled by the 17754 * {@link View#setX(float)} and {@link View#getX()} methods. 17755 */ 17756 public static final Property<View, Float> X = new FloatProperty<View>("x") { 17757 @Override 17758 public void setValue(View object, float value) { 17759 object.setX(value); 17760 } 17761 17762 @Override 17763 public Float get(View object) { 17764 return object.getX(); 17765 } 17766 }; 17767 17768 /** 17769 * A Property wrapper around the <code>y</code> functionality handled by the 17770 * {@link View#setY(float)} and {@link View#getY()} methods. 17771 */ 17772 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 17773 @Override 17774 public void setValue(View object, float value) { 17775 object.setY(value); 17776 } 17777 17778 @Override 17779 public Float get(View object) { 17780 return object.getY(); 17781 } 17782 }; 17783 17784 /** 17785 * A Property wrapper around the <code>rotation</code> functionality handled by the 17786 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 17787 */ 17788 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 17789 @Override 17790 public void setValue(View object, float value) { 17791 object.setRotation(value); 17792 } 17793 17794 @Override 17795 public Float get(View object) { 17796 return object.getRotation(); 17797 } 17798 }; 17799 17800 /** 17801 * A Property wrapper around the <code>rotationX</code> functionality handled by the 17802 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 17803 */ 17804 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 17805 @Override 17806 public void setValue(View object, float value) { 17807 object.setRotationX(value); 17808 } 17809 17810 @Override 17811 public Float get(View object) { 17812 return object.getRotationX(); 17813 } 17814 }; 17815 17816 /** 17817 * A Property wrapper around the <code>rotationY</code> functionality handled by the 17818 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 17819 */ 17820 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 17821 @Override 17822 public void setValue(View object, float value) { 17823 object.setRotationY(value); 17824 } 17825 17826 @Override 17827 public Float get(View object) { 17828 return object.getRotationY(); 17829 } 17830 }; 17831 17832 /** 17833 * A Property wrapper around the <code>scaleX</code> functionality handled by the 17834 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 17835 */ 17836 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 17837 @Override 17838 public void setValue(View object, float value) { 17839 object.setScaleX(value); 17840 } 17841 17842 @Override 17843 public Float get(View object) { 17844 return object.getScaleX(); 17845 } 17846 }; 17847 17848 /** 17849 * A Property wrapper around the <code>scaleY</code> functionality handled by the 17850 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 17851 */ 17852 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 17853 @Override 17854 public void setValue(View object, float value) { 17855 object.setScaleY(value); 17856 } 17857 17858 @Override 17859 public Float get(View object) { 17860 return object.getScaleY(); 17861 } 17862 }; 17863 17864 /** 17865 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 17866 * Each MeasureSpec represents a requirement for either the width or the height. 17867 * A MeasureSpec is comprised of a size and a mode. There are three possible 17868 * modes: 17869 * <dl> 17870 * <dt>UNSPECIFIED</dt> 17871 * <dd> 17872 * The parent has not imposed any constraint on the child. It can be whatever size 17873 * it wants. 17874 * </dd> 17875 * 17876 * <dt>EXACTLY</dt> 17877 * <dd> 17878 * The parent has determined an exact size for the child. The child is going to be 17879 * given those bounds regardless of how big it wants to be. 17880 * </dd> 17881 * 17882 * <dt>AT_MOST</dt> 17883 * <dd> 17884 * The child can be as large as it wants up to the specified size. 17885 * </dd> 17886 * </dl> 17887 * 17888 * MeasureSpecs are implemented as ints to reduce object allocation. This class 17889 * is provided to pack and unpack the <size, mode> tuple into the int. 17890 */ 17891 public static class MeasureSpec { 17892 private static final int MODE_SHIFT = 30; 17893 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 17894 17895 /** 17896 * Measure specification mode: The parent has not imposed any constraint 17897 * on the child. It can be whatever size it wants. 17898 */ 17899 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 17900 17901 /** 17902 * Measure specification mode: The parent has determined an exact size 17903 * for the child. The child is going to be given those bounds regardless 17904 * of how big it wants to be. 17905 */ 17906 public static final int EXACTLY = 1 << MODE_SHIFT; 17907 17908 /** 17909 * Measure specification mode: The child can be as large as it wants up 17910 * to the specified size. 17911 */ 17912 public static final int AT_MOST = 2 << MODE_SHIFT; 17913 17914 /** 17915 * Creates a measure specification based on the supplied size and mode. 17916 * 17917 * The mode must always be one of the following: 17918 * <ul> 17919 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 17920 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 17921 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 17922 * </ul> 17923 * 17924 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 17925 * implementation was such that the order of arguments did not matter 17926 * and overflow in either value could impact the resulting MeasureSpec. 17927 * {@link android.widget.RelativeLayout} was affected by this bug. 17928 * Apps targeting API levels greater than 17 will get the fixed, more strict 17929 * behavior.</p> 17930 * 17931 * @param size the size of the measure specification 17932 * @param mode the mode of the measure specification 17933 * @return the measure specification based on size and mode 17934 */ 17935 public static int makeMeasureSpec(int size, int mode) { 17936 if (sUseBrokenMakeMeasureSpec) { 17937 return size + mode; 17938 } else { 17939 return (size & ~MODE_MASK) | (mode & MODE_MASK); 17940 } 17941 } 17942 17943 /** 17944 * Extracts the mode from the supplied measure specification. 17945 * 17946 * @param measureSpec the measure specification to extract the mode from 17947 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 17948 * {@link android.view.View.MeasureSpec#AT_MOST} or 17949 * {@link android.view.View.MeasureSpec#EXACTLY} 17950 */ 17951 public static int getMode(int measureSpec) { 17952 return (measureSpec & MODE_MASK); 17953 } 17954 17955 /** 17956 * Extracts the size from the supplied measure specification. 17957 * 17958 * @param measureSpec the measure specification to extract the size from 17959 * @return the size in pixels defined in the supplied measure specification 17960 */ 17961 public static int getSize(int measureSpec) { 17962 return (measureSpec & ~MODE_MASK); 17963 } 17964 17965 static int adjust(int measureSpec, int delta) { 17966 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 17967 } 17968 17969 /** 17970 * Returns a String representation of the specified measure 17971 * specification. 17972 * 17973 * @param measureSpec the measure specification to convert to a String 17974 * @return a String with the following format: "MeasureSpec: MODE SIZE" 17975 */ 17976 public static String toString(int measureSpec) { 17977 int mode = getMode(measureSpec); 17978 int size = getSize(measureSpec); 17979 17980 StringBuilder sb = new StringBuilder("MeasureSpec: "); 17981 17982 if (mode == UNSPECIFIED) 17983 sb.append("UNSPECIFIED "); 17984 else if (mode == EXACTLY) 17985 sb.append("EXACTLY "); 17986 else if (mode == AT_MOST) 17987 sb.append("AT_MOST "); 17988 else 17989 sb.append(mode).append(" "); 17990 17991 sb.append(size); 17992 return sb.toString(); 17993 } 17994 } 17995 17996 class CheckForLongPress implements Runnable { 17997 17998 private int mOriginalWindowAttachCount; 17999 18000 public void run() { 18001 if (isPressed() && (mParent != null) 18002 && mOriginalWindowAttachCount == mWindowAttachCount) { 18003 if (performLongClick()) { 18004 mHasPerformedLongPress = true; 18005 } 18006 } 18007 } 18008 18009 public void rememberWindowAttachCount() { 18010 mOriginalWindowAttachCount = mWindowAttachCount; 18011 } 18012 } 18013 18014 private final class CheckForTap implements Runnable { 18015 public void run() { 18016 mPrivateFlags &= ~PFLAG_PREPRESSED; 18017 setPressed(true); 18018 checkForLongClick(ViewConfiguration.getTapTimeout()); 18019 } 18020 } 18021 18022 private final class PerformClick implements Runnable { 18023 public void run() { 18024 performClick(); 18025 } 18026 } 18027 18028 /** @hide */ 18029 public void hackTurnOffWindowResizeAnim(boolean off) { 18030 mAttachInfo.mTurnOffWindowResizeAnim = off; 18031 } 18032 18033 /** 18034 * This method returns a ViewPropertyAnimator object, which can be used to animate 18035 * specific properties on this View. 18036 * 18037 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 18038 */ 18039 public ViewPropertyAnimator animate() { 18040 if (mAnimator == null) { 18041 mAnimator = new ViewPropertyAnimator(this); 18042 } 18043 return mAnimator; 18044 } 18045 18046 /** 18047 * Set the current Scene that this view is in. The current scene is set only 18048 * on the root view of a scene, not for every view in that hierarchy. This 18049 * information is used by Scene to determine whether there is a previous 18050 * scene which should be exited before the new scene is entered. 18051 * 18052 * @param scene The new scene being set on the view 18053 * 18054 * @hide 18055 */ 18056 public void setCurrentScene(Scene scene) { 18057 mCurrentScene = scene; 18058 } 18059 18060 /** 18061 * Gets the current {@link Scene} set on this view. A scene is set on a view 18062 * only if that view is the scene root. 18063 * 18064 * @return The current Scene set on this view. A value of null indicates that 18065 * no Scene is current set. 18066 */ 18067 public Scene getCurrentScene() { 18068 return mCurrentScene; 18069 } 18070 18071 /** 18072 * Interface definition for a callback to be invoked when a hardware key event is 18073 * dispatched to this view. The callback will be invoked before the key event is 18074 * given to the view. This is only useful for hardware keyboards; a software input 18075 * method has no obligation to trigger this listener. 18076 */ 18077 public interface OnKeyListener { 18078 /** 18079 * Called when a hardware key is dispatched to a view. This allows listeners to 18080 * get a chance to respond before the target view. 18081 * <p>Key presses in software keyboards will generally NOT trigger this method, 18082 * although some may elect to do so in some situations. Do not assume a 18083 * software input method has to be key-based; even if it is, it may use key presses 18084 * in a different way than you expect, so there is no way to reliably catch soft 18085 * input key presses. 18086 * 18087 * @param v The view the key has been dispatched to. 18088 * @param keyCode The code for the physical key that was pressed 18089 * @param event The KeyEvent object containing full information about 18090 * the event. 18091 * @return True if the listener has consumed the event, false otherwise. 18092 */ 18093 boolean onKey(View v, int keyCode, KeyEvent event); 18094 } 18095 18096 /** 18097 * Interface definition for a callback to be invoked when a touch event is 18098 * dispatched to this view. The callback will be invoked before the touch 18099 * event is given to the view. 18100 */ 18101 public interface OnTouchListener { 18102 /** 18103 * Called when a touch event is dispatched to a view. This allows listeners to 18104 * get a chance to respond before the target view. 18105 * 18106 * @param v The view the touch event has been dispatched to. 18107 * @param event The MotionEvent object containing full information about 18108 * the event. 18109 * @return True if the listener has consumed the event, false otherwise. 18110 */ 18111 boolean onTouch(View v, MotionEvent event); 18112 } 18113 18114 /** 18115 * Interface definition for a callback to be invoked when a hover event is 18116 * dispatched to this view. The callback will be invoked before the hover 18117 * event is given to the view. 18118 */ 18119 public interface OnHoverListener { 18120 /** 18121 * Called when a hover event is dispatched to a view. This allows listeners to 18122 * get a chance to respond before the target view. 18123 * 18124 * @param v The view the hover event has been dispatched to. 18125 * @param event The MotionEvent object containing full information about 18126 * the event. 18127 * @return True if the listener has consumed the event, false otherwise. 18128 */ 18129 boolean onHover(View v, MotionEvent event); 18130 } 18131 18132 /** 18133 * Interface definition for a callback to be invoked when a generic motion event is 18134 * dispatched to this view. The callback will be invoked before the generic motion 18135 * event is given to the view. 18136 */ 18137 public interface OnGenericMotionListener { 18138 /** 18139 * Called when a generic motion event is dispatched to a view. This allows listeners to 18140 * get a chance to respond before the target view. 18141 * 18142 * @param v The view the generic motion event has been dispatched to. 18143 * @param event The MotionEvent object containing full information about 18144 * the event. 18145 * @return True if the listener has consumed the event, false otherwise. 18146 */ 18147 boolean onGenericMotion(View v, MotionEvent event); 18148 } 18149 18150 /** 18151 * Interface definition for a callback to be invoked when a view has been clicked and held. 18152 */ 18153 public interface OnLongClickListener { 18154 /** 18155 * Called when a view has been clicked and held. 18156 * 18157 * @param v The view that was clicked and held. 18158 * 18159 * @return true if the callback consumed the long click, false otherwise. 18160 */ 18161 boolean onLongClick(View v); 18162 } 18163 18164 /** 18165 * Interface definition for a callback to be invoked when a drag is being dispatched 18166 * to this view. The callback will be invoked before the hosting view's own 18167 * onDrag(event) method. If the listener wants to fall back to the hosting view's 18168 * onDrag(event) behavior, it should return 'false' from this callback. 18169 * 18170 * <div class="special reference"> 18171 * <h3>Developer Guides</h3> 18172 * <p>For a guide to implementing drag and drop features, read the 18173 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 18174 * </div> 18175 */ 18176 public interface OnDragListener { 18177 /** 18178 * Called when a drag event is dispatched to a view. This allows listeners 18179 * to get a chance to override base View behavior. 18180 * 18181 * @param v The View that received the drag event. 18182 * @param event The {@link android.view.DragEvent} object for the drag event. 18183 * @return {@code true} if the drag event was handled successfully, or {@code false} 18184 * if the drag event was not handled. Note that {@code false} will trigger the View 18185 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 18186 */ 18187 boolean onDrag(View v, DragEvent event); 18188 } 18189 18190 /** 18191 * Interface definition for a callback to be invoked when the focus state of 18192 * a view changed. 18193 */ 18194 public interface OnFocusChangeListener { 18195 /** 18196 * Called when the focus state of a view has changed. 18197 * 18198 * @param v The view whose state has changed. 18199 * @param hasFocus The new focus state of v. 18200 */ 18201 void onFocusChange(View v, boolean hasFocus); 18202 } 18203 18204 /** 18205 * Interface definition for a callback to be invoked when a view is clicked. 18206 */ 18207 public interface OnClickListener { 18208 /** 18209 * Called when a view has been clicked. 18210 * 18211 * @param v The view that was clicked. 18212 */ 18213 void onClick(View v); 18214 } 18215 18216 /** 18217 * Interface definition for a callback to be invoked when the context menu 18218 * for this view is being built. 18219 */ 18220 public interface OnCreateContextMenuListener { 18221 /** 18222 * Called when the context menu for this view is being built. It is not 18223 * safe to hold onto the menu after this method returns. 18224 * 18225 * @param menu The context menu that is being built 18226 * @param v The view for which the context menu is being built 18227 * @param menuInfo Extra information about the item for which the 18228 * context menu should be shown. This information will vary 18229 * depending on the class of v. 18230 */ 18231 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 18232 } 18233 18234 /** 18235 * Interface definition for a callback to be invoked when the status bar changes 18236 * visibility. This reports <strong>global</strong> changes to the system UI 18237 * state, not what the application is requesting. 18238 * 18239 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 18240 */ 18241 public interface OnSystemUiVisibilityChangeListener { 18242 /** 18243 * Called when the status bar changes visibility because of a call to 18244 * {@link View#setSystemUiVisibility(int)}. 18245 * 18246 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 18247 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 18248 * This tells you the <strong>global</strong> state of these UI visibility 18249 * flags, not what your app is currently applying. 18250 */ 18251 public void onSystemUiVisibilityChange(int visibility); 18252 } 18253 18254 /** 18255 * Interface definition for a callback to be invoked when this view is attached 18256 * or detached from its window. 18257 */ 18258 public interface OnAttachStateChangeListener { 18259 /** 18260 * Called when the view is attached to a window. 18261 * @param v The view that was attached 18262 */ 18263 public void onViewAttachedToWindow(View v); 18264 /** 18265 * Called when the view is detached from a window. 18266 * @param v The view that was detached 18267 */ 18268 public void onViewDetachedFromWindow(View v); 18269 } 18270 18271 private final class UnsetPressedState implements Runnable { 18272 public void run() { 18273 setPressed(false); 18274 } 18275 } 18276 18277 /** 18278 * Base class for derived classes that want to save and restore their own 18279 * state in {@link android.view.View#onSaveInstanceState()}. 18280 */ 18281 public static class BaseSavedState extends AbsSavedState { 18282 /** 18283 * Constructor used when reading from a parcel. Reads the state of the superclass. 18284 * 18285 * @param source 18286 */ 18287 public BaseSavedState(Parcel source) { 18288 super(source); 18289 } 18290 18291 /** 18292 * Constructor called by derived classes when creating their SavedState objects 18293 * 18294 * @param superState The state of the superclass of this view 18295 */ 18296 public BaseSavedState(Parcelable superState) { 18297 super(superState); 18298 } 18299 18300 public static final Parcelable.Creator<BaseSavedState> CREATOR = 18301 new Parcelable.Creator<BaseSavedState>() { 18302 public BaseSavedState createFromParcel(Parcel in) { 18303 return new BaseSavedState(in); 18304 } 18305 18306 public BaseSavedState[] newArray(int size) { 18307 return new BaseSavedState[size]; 18308 } 18309 }; 18310 } 18311 18312 /** 18313 * A set of information given to a view when it is attached to its parent 18314 * window. 18315 */ 18316 static class AttachInfo { 18317 interface Callbacks { 18318 void playSoundEffect(int effectId); 18319 boolean performHapticFeedback(int effectId, boolean always); 18320 } 18321 18322 /** 18323 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 18324 * to a Handler. This class contains the target (View) to invalidate and 18325 * the coordinates of the dirty rectangle. 18326 * 18327 * For performance purposes, this class also implements a pool of up to 18328 * POOL_LIMIT objects that get reused. This reduces memory allocations 18329 * whenever possible. 18330 */ 18331 static class InvalidateInfo { 18332 private static final int POOL_LIMIT = 10; 18333 18334 private static final SynchronizedPool<InvalidateInfo> sPool = 18335 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 18336 18337 View target; 18338 18339 int left; 18340 int top; 18341 int right; 18342 int bottom; 18343 18344 public static InvalidateInfo obtain() { 18345 InvalidateInfo instance = sPool.acquire(); 18346 return (instance != null) ? instance : new InvalidateInfo(); 18347 } 18348 18349 public void recycle() { 18350 target = null; 18351 sPool.release(this); 18352 } 18353 } 18354 18355 final IWindowSession mSession; 18356 18357 final IWindow mWindow; 18358 18359 final IBinder mWindowToken; 18360 18361 final Display mDisplay; 18362 18363 final Callbacks mRootCallbacks; 18364 18365 HardwareCanvas mHardwareCanvas; 18366 18367 IWindowId mIWindowId; 18368 WindowId mWindowId; 18369 18370 /** 18371 * The top view of the hierarchy. 18372 */ 18373 View mRootView; 18374 18375 IBinder mPanelParentWindowToken; 18376 Surface mSurface; 18377 18378 boolean mHardwareAccelerated; 18379 boolean mHardwareAccelerationRequested; 18380 HardwareRenderer mHardwareRenderer; 18381 18382 boolean mScreenOn; 18383 18384 /** 18385 * Scale factor used by the compatibility mode 18386 */ 18387 float mApplicationScale; 18388 18389 /** 18390 * Indicates whether the application is in compatibility mode 18391 */ 18392 boolean mScalingRequired; 18393 18394 /** 18395 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 18396 */ 18397 boolean mTurnOffWindowResizeAnim; 18398 18399 /** 18400 * Left position of this view's window 18401 */ 18402 int mWindowLeft; 18403 18404 /** 18405 * Top position of this view's window 18406 */ 18407 int mWindowTop; 18408 18409 /** 18410 * Indicates whether views need to use 32-bit drawing caches 18411 */ 18412 boolean mUse32BitDrawingCache; 18413 18414 /** 18415 * For windows that are full-screen but using insets to layout inside 18416 * of the screen areas, these are the current insets to appear inside 18417 * the overscan area of the display. 18418 */ 18419 final Rect mOverscanInsets = new Rect(); 18420 18421 /** 18422 * For windows that are full-screen but using insets to layout inside 18423 * of the screen decorations, these are the current insets for the 18424 * content of the window. 18425 */ 18426 final Rect mContentInsets = new Rect(); 18427 18428 /** 18429 * For windows that are full-screen but using insets to layout inside 18430 * of the screen decorations, these are the current insets for the 18431 * actual visible parts of the window. 18432 */ 18433 final Rect mVisibleInsets = new Rect(); 18434 18435 /** 18436 * The internal insets given by this window. This value is 18437 * supplied by the client (through 18438 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 18439 * be given to the window manager when changed to be used in laying 18440 * out windows behind it. 18441 */ 18442 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 18443 = new ViewTreeObserver.InternalInsetsInfo(); 18444 18445 /** 18446 * All views in the window's hierarchy that serve as scroll containers, 18447 * used to determine if the window can be resized or must be panned 18448 * to adjust for a soft input area. 18449 */ 18450 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 18451 18452 final KeyEvent.DispatcherState mKeyDispatchState 18453 = new KeyEvent.DispatcherState(); 18454 18455 /** 18456 * Indicates whether the view's window currently has the focus. 18457 */ 18458 boolean mHasWindowFocus; 18459 18460 /** 18461 * The current visibility of the window. 18462 */ 18463 int mWindowVisibility; 18464 18465 /** 18466 * Indicates the time at which drawing started to occur. 18467 */ 18468 long mDrawingTime; 18469 18470 /** 18471 * Indicates whether or not ignoring the DIRTY_MASK flags. 18472 */ 18473 boolean mIgnoreDirtyState; 18474 18475 /** 18476 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 18477 * to avoid clearing that flag prematurely. 18478 */ 18479 boolean mSetIgnoreDirtyState = false; 18480 18481 /** 18482 * Indicates whether the view's window is currently in touch mode. 18483 */ 18484 boolean mInTouchMode; 18485 18486 /** 18487 * Indicates that ViewAncestor should trigger a global layout change 18488 * the next time it performs a traversal 18489 */ 18490 boolean mRecomputeGlobalAttributes; 18491 18492 /** 18493 * Always report new attributes at next traversal. 18494 */ 18495 boolean mForceReportNewAttributes; 18496 18497 /** 18498 * Set during a traveral if any views want to keep the screen on. 18499 */ 18500 boolean mKeepScreenOn; 18501 18502 /** 18503 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 18504 */ 18505 int mSystemUiVisibility; 18506 18507 /** 18508 * Hack to force certain system UI visibility flags to be cleared. 18509 */ 18510 int mDisabledSystemUiVisibility; 18511 18512 /** 18513 * Last global system UI visibility reported by the window manager. 18514 */ 18515 int mGlobalSystemUiVisibility; 18516 18517 /** 18518 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 18519 * attached. 18520 */ 18521 boolean mHasSystemUiListeners; 18522 18523 /** 18524 * Set if the window has requested to extend into the overscan region 18525 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 18526 */ 18527 boolean mOverscanRequested; 18528 18529 /** 18530 * Set if the visibility of any views has changed. 18531 */ 18532 boolean mViewVisibilityChanged; 18533 18534 /** 18535 * Set to true if a view has been scrolled. 18536 */ 18537 boolean mViewScrollChanged; 18538 18539 /** 18540 * Global to the view hierarchy used as a temporary for dealing with 18541 * x/y points in the transparent region computations. 18542 */ 18543 final int[] mTransparentLocation = new int[2]; 18544 18545 /** 18546 * Global to the view hierarchy used as a temporary for dealing with 18547 * x/y points in the ViewGroup.invalidateChild implementation. 18548 */ 18549 final int[] mInvalidateChildLocation = new int[2]; 18550 18551 18552 /** 18553 * Global to the view hierarchy used as a temporary for dealing with 18554 * x/y location when view is transformed. 18555 */ 18556 final float[] mTmpTransformLocation = new float[2]; 18557 18558 /** 18559 * The view tree observer used to dispatch global events like 18560 * layout, pre-draw, touch mode change, etc. 18561 */ 18562 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 18563 18564 /** 18565 * A Canvas used by the view hierarchy to perform bitmap caching. 18566 */ 18567 Canvas mCanvas; 18568 18569 /** 18570 * The view root impl. 18571 */ 18572 final ViewRootImpl mViewRootImpl; 18573 18574 /** 18575 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 18576 * handler can be used to pump events in the UI events queue. 18577 */ 18578 final Handler mHandler; 18579 18580 /** 18581 * Temporary for use in computing invalidate rectangles while 18582 * calling up the hierarchy. 18583 */ 18584 final Rect mTmpInvalRect = new Rect(); 18585 18586 /** 18587 * Temporary for use in computing hit areas with transformed views 18588 */ 18589 final RectF mTmpTransformRect = new RectF(); 18590 18591 /** 18592 * Temporary for use in transforming invalidation rect 18593 */ 18594 final Matrix mTmpMatrix = new Matrix(); 18595 18596 /** 18597 * Temporary for use in transforming invalidation rect 18598 */ 18599 final Transformation mTmpTransformation = new Transformation(); 18600 18601 /** 18602 * Temporary list for use in collecting focusable descendents of a view. 18603 */ 18604 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 18605 18606 /** 18607 * The id of the window for accessibility purposes. 18608 */ 18609 int mAccessibilityWindowId = View.NO_ID; 18610 18611 /** 18612 * Flags related to accessibility processing. 18613 * 18614 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 18615 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 18616 */ 18617 int mAccessibilityFetchFlags; 18618 18619 /** 18620 * The drawable for highlighting accessibility focus. 18621 */ 18622 Drawable mAccessibilityFocusDrawable; 18623 18624 /** 18625 * Show where the margins, bounds and layout bounds are for each view. 18626 */ 18627 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 18628 18629 /** 18630 * Point used to compute visible regions. 18631 */ 18632 final Point mPoint = new Point(); 18633 18634 /** 18635 * Used to track which View originated a requestLayout() call, used when 18636 * requestLayout() is called during layout. 18637 */ 18638 View mViewRequestingLayout; 18639 18640 /** 18641 * Creates a new set of attachment information with the specified 18642 * events handler and thread. 18643 * 18644 * @param handler the events handler the view must use 18645 */ 18646 AttachInfo(IWindowSession session, IWindow window, Display display, 18647 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 18648 mSession = session; 18649 mWindow = window; 18650 mWindowToken = window.asBinder(); 18651 mDisplay = display; 18652 mViewRootImpl = viewRootImpl; 18653 mHandler = handler; 18654 mRootCallbacks = effectPlayer; 18655 } 18656 } 18657 18658 /** 18659 * <p>ScrollabilityCache holds various fields used by a View when scrolling 18660 * is supported. This avoids keeping too many unused fields in most 18661 * instances of View.</p> 18662 */ 18663 private static class ScrollabilityCache implements Runnable { 18664 18665 /** 18666 * Scrollbars are not visible 18667 */ 18668 public static final int OFF = 0; 18669 18670 /** 18671 * Scrollbars are visible 18672 */ 18673 public static final int ON = 1; 18674 18675 /** 18676 * Scrollbars are fading away 18677 */ 18678 public static final int FADING = 2; 18679 18680 public boolean fadeScrollBars; 18681 18682 public int fadingEdgeLength; 18683 public int scrollBarDefaultDelayBeforeFade; 18684 public int scrollBarFadeDuration; 18685 18686 public int scrollBarSize; 18687 public ScrollBarDrawable scrollBar; 18688 public float[] interpolatorValues; 18689 public View host; 18690 18691 public final Paint paint; 18692 public final Matrix matrix; 18693 public Shader shader; 18694 18695 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 18696 18697 private static final float[] OPAQUE = { 255 }; 18698 private static final float[] TRANSPARENT = { 0.0f }; 18699 18700 /** 18701 * When fading should start. This time moves into the future every time 18702 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 18703 */ 18704 public long fadeStartTime; 18705 18706 18707 /** 18708 * The current state of the scrollbars: ON, OFF, or FADING 18709 */ 18710 public int state = OFF; 18711 18712 private int mLastColor; 18713 18714 public ScrollabilityCache(ViewConfiguration configuration, View host) { 18715 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 18716 scrollBarSize = configuration.getScaledScrollBarSize(); 18717 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 18718 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 18719 18720 paint = new Paint(); 18721 matrix = new Matrix(); 18722 // use use a height of 1, and then wack the matrix each time we 18723 // actually use it. 18724 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18725 paint.setShader(shader); 18726 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18727 18728 this.host = host; 18729 } 18730 18731 public void setFadeColor(int color) { 18732 if (color != mLastColor) { 18733 mLastColor = color; 18734 18735 if (color != 0) { 18736 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 18737 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 18738 paint.setShader(shader); 18739 // Restore the default transfer mode (src_over) 18740 paint.setXfermode(null); 18741 } else { 18742 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18743 paint.setShader(shader); 18744 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18745 } 18746 } 18747 } 18748 18749 public void run() { 18750 long now = AnimationUtils.currentAnimationTimeMillis(); 18751 if (now >= fadeStartTime) { 18752 18753 // the animation fades the scrollbars out by changing 18754 // the opacity (alpha) from fully opaque to fully 18755 // transparent 18756 int nextFrame = (int) now; 18757 int framesCount = 0; 18758 18759 Interpolator interpolator = scrollBarInterpolator; 18760 18761 // Start opaque 18762 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 18763 18764 // End transparent 18765 nextFrame += scrollBarFadeDuration; 18766 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 18767 18768 state = FADING; 18769 18770 // Kick off the fade animation 18771 host.invalidate(true); 18772 } 18773 } 18774 } 18775 18776 /** 18777 * Resuable callback for sending 18778 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 18779 */ 18780 private class SendViewScrolledAccessibilityEvent implements Runnable { 18781 public volatile boolean mIsPending; 18782 18783 public void run() { 18784 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 18785 mIsPending = false; 18786 } 18787 } 18788 18789 /** 18790 * <p> 18791 * This class represents a delegate that can be registered in a {@link View} 18792 * to enhance accessibility support via composition rather via inheritance. 18793 * It is specifically targeted to widget developers that extend basic View 18794 * classes i.e. classes in package android.view, that would like their 18795 * applications to be backwards compatible. 18796 * </p> 18797 * <div class="special reference"> 18798 * <h3>Developer Guides</h3> 18799 * <p>For more information about making applications accessible, read the 18800 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 18801 * developer guide.</p> 18802 * </div> 18803 * <p> 18804 * A scenario in which a developer would like to use an accessibility delegate 18805 * is overriding a method introduced in a later API version then the minimal API 18806 * version supported by the application. For example, the method 18807 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 18808 * in API version 4 when the accessibility APIs were first introduced. If a 18809 * developer would like his application to run on API version 4 devices (assuming 18810 * all other APIs used by the application are version 4 or lower) and take advantage 18811 * of this method, instead of overriding the method which would break the application's 18812 * backwards compatibility, he can override the corresponding method in this 18813 * delegate and register the delegate in the target View if the API version of 18814 * the system is high enough i.e. the API version is same or higher to the API 18815 * version that introduced 18816 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 18817 * </p> 18818 * <p> 18819 * Here is an example implementation: 18820 * </p> 18821 * <code><pre><p> 18822 * if (Build.VERSION.SDK_INT >= 14) { 18823 * // If the API version is equal of higher than the version in 18824 * // which onInitializeAccessibilityNodeInfo was introduced we 18825 * // register a delegate with a customized implementation. 18826 * View view = findViewById(R.id.view_id); 18827 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 18828 * public void onInitializeAccessibilityNodeInfo(View host, 18829 * AccessibilityNodeInfo info) { 18830 * // Let the default implementation populate the info. 18831 * super.onInitializeAccessibilityNodeInfo(host, info); 18832 * // Set some other information. 18833 * info.setEnabled(host.isEnabled()); 18834 * } 18835 * }); 18836 * } 18837 * </code></pre></p> 18838 * <p> 18839 * This delegate contains methods that correspond to the accessibility methods 18840 * in View. If a delegate has been specified the implementation in View hands 18841 * off handling to the corresponding method in this delegate. The default 18842 * implementation the delegate methods behaves exactly as the corresponding 18843 * method in View for the case of no accessibility delegate been set. Hence, 18844 * to customize the behavior of a View method, clients can override only the 18845 * corresponding delegate method without altering the behavior of the rest 18846 * accessibility related methods of the host view. 18847 * </p> 18848 */ 18849 public static class AccessibilityDelegate { 18850 18851 /** 18852 * Sends an accessibility event of the given type. If accessibility is not 18853 * enabled this method has no effect. 18854 * <p> 18855 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 18856 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 18857 * been set. 18858 * </p> 18859 * 18860 * @param host The View hosting the delegate. 18861 * @param eventType The type of the event to send. 18862 * 18863 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 18864 */ 18865 public void sendAccessibilityEvent(View host, int eventType) { 18866 host.sendAccessibilityEventInternal(eventType); 18867 } 18868 18869 /** 18870 * Performs the specified accessibility action on the view. For 18871 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 18872 * <p> 18873 * The default implementation behaves as 18874 * {@link View#performAccessibilityAction(int, Bundle) 18875 * View#performAccessibilityAction(int, Bundle)} for the case of 18876 * no accessibility delegate been set. 18877 * </p> 18878 * 18879 * @param action The action to perform. 18880 * @return Whether the action was performed. 18881 * 18882 * @see View#performAccessibilityAction(int, Bundle) 18883 * View#performAccessibilityAction(int, Bundle) 18884 */ 18885 public boolean performAccessibilityAction(View host, int action, Bundle args) { 18886 return host.performAccessibilityActionInternal(action, args); 18887 } 18888 18889 /** 18890 * Sends an accessibility event. This method behaves exactly as 18891 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 18892 * empty {@link AccessibilityEvent} and does not perform a check whether 18893 * accessibility is enabled. 18894 * <p> 18895 * The default implementation behaves as 18896 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18897 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 18898 * the case of no accessibility delegate been set. 18899 * </p> 18900 * 18901 * @param host The View hosting the delegate. 18902 * @param event The event to send. 18903 * 18904 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18905 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18906 */ 18907 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 18908 host.sendAccessibilityEventUncheckedInternal(event); 18909 } 18910 18911 /** 18912 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 18913 * to its children for adding their text content to the event. 18914 * <p> 18915 * The default implementation behaves as 18916 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18917 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 18918 * the case of no accessibility delegate been set. 18919 * </p> 18920 * 18921 * @param host The View hosting the delegate. 18922 * @param event The event. 18923 * @return True if the event population was completed. 18924 * 18925 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18926 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18927 */ 18928 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18929 return host.dispatchPopulateAccessibilityEventInternal(event); 18930 } 18931 18932 /** 18933 * Gives a chance to the host View to populate the accessibility event with its 18934 * text content. 18935 * <p> 18936 * The default implementation behaves as 18937 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 18938 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 18939 * the case of no accessibility delegate been set. 18940 * </p> 18941 * 18942 * @param host The View hosting the delegate. 18943 * @param event The accessibility event which to populate. 18944 * 18945 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 18946 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 18947 */ 18948 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18949 host.onPopulateAccessibilityEventInternal(event); 18950 } 18951 18952 /** 18953 * Initializes an {@link AccessibilityEvent} with information about the 18954 * the host View which is the event source. 18955 * <p> 18956 * The default implementation behaves as 18957 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 18958 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 18959 * the case of no accessibility delegate been set. 18960 * </p> 18961 * 18962 * @param host The View hosting the delegate. 18963 * @param event The event to initialize. 18964 * 18965 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 18966 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 18967 */ 18968 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 18969 host.onInitializeAccessibilityEventInternal(event); 18970 } 18971 18972 /** 18973 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 18974 * <p> 18975 * The default implementation behaves as 18976 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18977 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 18978 * the case of no accessibility delegate been set. 18979 * </p> 18980 * 18981 * @param host The View hosting the delegate. 18982 * @param info The instance to initialize. 18983 * 18984 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18985 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18986 */ 18987 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 18988 host.onInitializeAccessibilityNodeInfoInternal(info); 18989 } 18990 18991 /** 18992 * Called when a child of the host View has requested sending an 18993 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 18994 * to augment the event. 18995 * <p> 18996 * The default implementation behaves as 18997 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18998 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 18999 * the case of no accessibility delegate been set. 19000 * </p> 19001 * 19002 * @param host The View hosting the delegate. 19003 * @param child The child which requests sending the event. 19004 * @param event The event to be sent. 19005 * @return True if the event should be sent 19006 * 19007 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 19008 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 19009 */ 19010 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 19011 AccessibilityEvent event) { 19012 return host.onRequestSendAccessibilityEventInternal(child, event); 19013 } 19014 19015 /** 19016 * Gets the provider for managing a virtual view hierarchy rooted at this View 19017 * and reported to {@link android.accessibilityservice.AccessibilityService}s 19018 * that explore the window content. 19019 * <p> 19020 * The default implementation behaves as 19021 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 19022 * the case of no accessibility delegate been set. 19023 * </p> 19024 * 19025 * @return The provider. 19026 * 19027 * @see AccessibilityNodeProvider 19028 */ 19029 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 19030 return null; 19031 } 19032 19033 /** 19034 * Returns an {@link AccessibilityNodeInfo} representing the host view from the 19035 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 19036 * This method is responsible for obtaining an accessibility node info from a 19037 * pool of reusable instances and calling 19038 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host 19039 * view to initialize the former. 19040 * <p> 19041 * <strong>Note:</strong> The client is responsible for recycling the obtained 19042 * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object 19043 * creation. 19044 * </p> 19045 * <p> 19046 * The default implementation behaves as 19047 * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for 19048 * the case of no accessibility delegate been set. 19049 * </p> 19050 * @return A populated {@link AccessibilityNodeInfo}. 19051 * 19052 * @see AccessibilityNodeInfo 19053 * 19054 * @hide 19055 */ 19056 public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { 19057 return host.createAccessibilityNodeInfoInternal(); 19058 } 19059 } 19060 19061 private class MatchIdPredicate implements Predicate<View> { 19062 public int mId; 19063 19064 @Override 19065 public boolean apply(View view) { 19066 return (view.mID == mId); 19067 } 19068 } 19069 19070 private class MatchLabelForPredicate implements Predicate<View> { 19071 private int mLabeledId; 19072 19073 @Override 19074 public boolean apply(View view) { 19075 return (view.mLabelForId == mLabeledId); 19076 } 19077 } 19078 19079 private class SendViewStateChangedAccessibilityEvent implements Runnable { 19080 private boolean mPosted; 19081 private long mLastEventTimeMillis; 19082 19083 public void run() { 19084 mPosted = false; 19085 mLastEventTimeMillis = SystemClock.uptimeMillis(); 19086 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 19087 AccessibilityEvent event = AccessibilityEvent.obtain(); 19088 event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED); 19089 event.setContentChangeType(AccessibilityEvent.CONTENT_CHANGE_TYPE_NODE); 19090 sendAccessibilityEventUnchecked(event); 19091 } 19092 } 19093 19094 public void runOrPost() { 19095 if (mPosted) { 19096 return; 19097 } 19098 final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis; 19099 final long minEventIntevalMillis = 19100 ViewConfiguration.getSendRecurringAccessibilityEventsInterval(); 19101 if (timeSinceLastMillis >= minEventIntevalMillis) { 19102 removeCallbacks(this); 19103 run(); 19104 } else { 19105 postDelayed(this, minEventIntevalMillis - timeSinceLastMillis); 19106 mPosted = true; 19107 } 19108 } 19109 } 19110 19111 /** 19112 * Dump all private flags in readable format, useful for documentation and 19113 * sanity checking. 19114 */ 19115 private static void dumpFlags() { 19116 final HashMap<String, String> found = Maps.newHashMap(); 19117 try { 19118 for (Field field : View.class.getDeclaredFields()) { 19119 final int modifiers = field.getModifiers(); 19120 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 19121 if (field.getType().equals(int.class)) { 19122 final int value = field.getInt(null); 19123 dumpFlag(found, field.getName(), value); 19124 } else if (field.getType().equals(int[].class)) { 19125 final int[] values = (int[]) field.get(null); 19126 for (int i = 0; i < values.length; i++) { 19127 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 19128 } 19129 } 19130 } 19131 } 19132 } catch (IllegalAccessException e) { 19133 throw new RuntimeException(e); 19134 } 19135 19136 final ArrayList<String> keys = Lists.newArrayList(); 19137 keys.addAll(found.keySet()); 19138 Collections.sort(keys); 19139 for (String key : keys) { 19140 Log.d(VIEW_LOG_TAG, found.get(key)); 19141 } 19142 } 19143 19144 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 19145 // Sort flags by prefix, then by bits, always keeping unique keys 19146 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 19147 final int prefix = name.indexOf('_'); 19148 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 19149 final String output = bits + " " + name; 19150 found.put(key, output); 19151 } 19152} 19153