View.java revision 25b0c3096131e532e57f5aac48769430dca42c75
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.Log; 55import android.util.LongSparseLongArray; 56import android.util.Pools.SynchronizedPool; 57import android.util.Property; 58import android.util.SparseArray; 59import android.util.TypedValue; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.AccessibilityIterators.TextSegmentIterator; 62import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 63import android.view.AccessibilityIterators.WordTextSegmentIterator; 64import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 65import android.view.accessibility.AccessibilityEvent; 66import android.view.accessibility.AccessibilityEventSource; 67import android.view.accessibility.AccessibilityManager; 68import android.view.accessibility.AccessibilityNodeInfo; 69import android.view.accessibility.AccessibilityNodeProvider; 70import android.view.animation.Animation; 71import android.view.animation.AnimationUtils; 72import android.view.animation.Transformation; 73import android.view.inputmethod.EditorInfo; 74import android.view.inputmethod.InputConnection; 75import android.view.inputmethod.InputMethodManager; 76import android.view.transition.Scene; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85import com.google.android.collect.Lists; 86import com.google.android.collect.Maps; 87 88import java.lang.ref.WeakReference; 89import java.lang.reflect.Field; 90import java.lang.reflect.InvocationTargetException; 91import java.lang.reflect.Method; 92import java.lang.reflect.Modifier; 93import java.util.ArrayList; 94import java.util.Arrays; 95import java.util.Collections; 96import java.util.HashMap; 97import java.util.Locale; 98import java.util.concurrent.CopyOnWriteArrayList; 99import java.util.concurrent.atomic.AtomicInteger; 100 101/** 102 * <p> 103 * This class represents the basic building block for user interface components. A View 104 * occupies a rectangular area on the screen and is responsible for drawing and 105 * event handling. View is the base class for <em>widgets</em>, which are 106 * used to create interactive UI components (buttons, text fields, etc.). The 107 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 108 * are invisible containers that hold other Views (or other ViewGroups) and define 109 * their layout properties. 110 * </p> 111 * 112 * <div class="special reference"> 113 * <h3>Developer Guides</h3> 114 * <p>For information about using this class to develop your application's user interface, 115 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 116 * </div> 117 * 118 * <a name="Using"></a> 119 * <h3>Using Views</h3> 120 * <p> 121 * All of the views in a window are arranged in a single tree. You can add views 122 * either from code or by specifying a tree of views in one or more XML layout 123 * files. There are many specialized subclasses of views that act as controls or 124 * are capable of displaying text, images, or other content. 125 * </p> 126 * <p> 127 * Once you have created a tree of views, there are typically a few types of 128 * common operations you may wish to perform: 129 * <ul> 130 * <li><strong>Set properties:</strong> for example setting the text of a 131 * {@link android.widget.TextView}. The available properties and the methods 132 * that set them will vary among the different subclasses of views. Note that 133 * properties that are known at build time can be set in the XML layout 134 * files.</li> 135 * <li><strong>Set focus:</strong> The framework will handled moving focus in 136 * response to user input. To force focus to a specific view, call 137 * {@link #requestFocus}.</li> 138 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 139 * that will be notified when something interesting happens to the view. For 140 * example, all views will let you set a listener to be notified when the view 141 * gains or loses focus. You can register such a listener using 142 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 143 * Other view subclasses offer more specialized listeners. For example, a Button 144 * exposes a listener to notify clients when the button is clicked.</li> 145 * <li><strong>Set visibility:</strong> You can hide or show views using 146 * {@link #setVisibility(int)}.</li> 147 * </ul> 148 * </p> 149 * <p><em> 150 * Note: The Android framework is responsible for measuring, laying out and 151 * drawing views. You should not call methods that perform these actions on 152 * views yourself unless you are actually implementing a 153 * {@link android.view.ViewGroup}. 154 * </em></p> 155 * 156 * <a name="Lifecycle"></a> 157 * <h3>Implementing a Custom View</h3> 158 * 159 * <p> 160 * To implement a custom view, you will usually begin by providing overrides for 161 * some of the standard methods that the framework calls on all views. You do 162 * not need to override all of these methods. In fact, you can start by just 163 * overriding {@link #onDraw(android.graphics.Canvas)}. 164 * <table border="2" width="85%" align="center" cellpadding="5"> 165 * <thead> 166 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 167 * </thead> 168 * 169 * <tbody> 170 * <tr> 171 * <td rowspan="2">Creation</td> 172 * <td>Constructors</td> 173 * <td>There is a form of the constructor that are called when the view 174 * is created from code and a form that is called when the view is 175 * inflated from a layout file. The second form should parse and apply 176 * any attributes defined in the layout file. 177 * </td> 178 * </tr> 179 * <tr> 180 * <td><code>{@link #onFinishInflate()}</code></td> 181 * <td>Called after a view and all of its children has been inflated 182 * from XML.</td> 183 * </tr> 184 * 185 * <tr> 186 * <td rowspan="3">Layout</td> 187 * <td><code>{@link #onMeasure(int, int)}</code></td> 188 * <td>Called to determine the size requirements for this view and all 189 * of its children. 190 * </td> 191 * </tr> 192 * <tr> 193 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 194 * <td>Called when this view should assign a size and position to all 195 * of its children. 196 * </td> 197 * </tr> 198 * <tr> 199 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 200 * <td>Called when the size of this view has changed. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td>Drawing</td> 206 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 207 * <td>Called when the view should render its content. 208 * </td> 209 * </tr> 210 * 211 * <tr> 212 * <td rowspan="4">Event processing</td> 213 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 214 * <td>Called when a new hardware key event occurs. 215 * </td> 216 * </tr> 217 * <tr> 218 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 219 * <td>Called when a hardware key up event occurs. 220 * </td> 221 * </tr> 222 * <tr> 223 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 224 * <td>Called when a trackball motion event occurs. 225 * </td> 226 * </tr> 227 * <tr> 228 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 229 * <td>Called when a touch screen motion event occurs. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td rowspan="2">Focus</td> 235 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 236 * <td>Called when the view gains or loses focus. 237 * </td> 238 * </tr> 239 * 240 * <tr> 241 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 242 * <td>Called when the window containing the view gains or loses focus. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td rowspan="3">Attaching</td> 248 * <td><code>{@link #onAttachedToWindow()}</code></td> 249 * <td>Called when the view is attached to a window. 250 * </td> 251 * </tr> 252 * 253 * <tr> 254 * <td><code>{@link #onDetachedFromWindow}</code></td> 255 * <td>Called when the view is detached from its window. 256 * </td> 257 * </tr> 258 * 259 * <tr> 260 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 261 * <td>Called when the visibility of the window containing the view 262 * has changed. 263 * </td> 264 * </tr> 265 * </tbody> 266 * 267 * </table> 268 * </p> 269 * 270 * <a name="IDs"></a> 271 * <h3>IDs</h3> 272 * Views may have an integer id associated with them. These ids are typically 273 * assigned in the layout XML files, and are used to find specific views within 274 * the view tree. A common pattern is to: 275 * <ul> 276 * <li>Define a Button in the layout file and assign it a unique ID. 277 * <pre> 278 * <Button 279 * android:id="@+id/my_button" 280 * android:layout_width="wrap_content" 281 * android:layout_height="wrap_content" 282 * android:text="@string/my_button_text"/> 283 * </pre></li> 284 * <li>From the onCreate method of an Activity, find the Button 285 * <pre class="prettyprint"> 286 * Button myButton = (Button) findViewById(R.id.my_button); 287 * </pre></li> 288 * </ul> 289 * <p> 290 * View IDs need not be unique throughout the tree, but it is good practice to 291 * ensure that they are at least unique within the part of the tree you are 292 * searching. 293 * </p> 294 * 295 * <a name="Position"></a> 296 * <h3>Position</h3> 297 * <p> 298 * The geometry of a view is that of a rectangle. A view has a location, 299 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 300 * two dimensions, expressed as a width and a height. The unit for location 301 * and dimensions is the pixel. 302 * </p> 303 * 304 * <p> 305 * It is possible to retrieve the location of a view by invoking the methods 306 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 307 * coordinate of the rectangle representing the view. The latter returns the 308 * top, or Y, coordinate of the rectangle representing the view. These methods 309 * both return the location of the view relative to its parent. For instance, 310 * when getLeft() returns 20, that means the view is located 20 pixels to the 311 * right of the left edge of its direct parent. 312 * </p> 313 * 314 * <p> 315 * In addition, several convenience methods are offered to avoid unnecessary 316 * computations, namely {@link #getRight()} and {@link #getBottom()}. 317 * These methods return the coordinates of the right and bottom edges of the 318 * rectangle representing the view. For instance, calling {@link #getRight()} 319 * is similar to the following computation: <code>getLeft() + getWidth()</code> 320 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 321 * </p> 322 * 323 * <a name="SizePaddingMargins"></a> 324 * <h3>Size, padding and margins</h3> 325 * <p> 326 * The size of a view is expressed with a width and a height. A view actually 327 * possess two pairs of width and height values. 328 * </p> 329 * 330 * <p> 331 * The first pair is known as <em>measured width</em> and 332 * <em>measured height</em>. These dimensions define how big a view wants to be 333 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 334 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 335 * and {@link #getMeasuredHeight()}. 336 * </p> 337 * 338 * <p> 339 * The second pair is simply known as <em>width</em> and <em>height</em>, or 340 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 341 * dimensions define the actual size of the view on screen, at drawing time and 342 * after layout. These values may, but do not have to, be different from the 343 * measured width and height. The width and height can be obtained by calling 344 * {@link #getWidth()} and {@link #getHeight()}. 345 * </p> 346 * 347 * <p> 348 * To measure its dimensions, a view takes into account its padding. The padding 349 * is expressed in pixels for the left, top, right and bottom parts of the view. 350 * Padding can be used to offset the content of the view by a specific amount of 351 * pixels. For instance, a left padding of 2 will push the view's content by 352 * 2 pixels to the right of the left edge. Padding can be set using the 353 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 354 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 355 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 356 * {@link #getPaddingEnd()}. 357 * </p> 358 * 359 * <p> 360 * Even though a view can define a padding, it does not provide any support for 361 * margins. However, view groups provide such a support. Refer to 362 * {@link android.view.ViewGroup} and 363 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 364 * </p> 365 * 366 * <a name="Layout"></a> 367 * <h3>Layout</h3> 368 * <p> 369 * Layout is a two pass process: a measure pass and a layout pass. The measuring 370 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 371 * of the view tree. Each view pushes dimension specifications down the tree 372 * during the recursion. At the end of the measure pass, every view has stored 373 * its measurements. The second pass happens in 374 * {@link #layout(int,int,int,int)} and is also top-down. During 375 * this pass each parent is responsible for positioning all of its children 376 * using the sizes computed in the measure pass. 377 * </p> 378 * 379 * <p> 380 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 381 * {@link #getMeasuredHeight()} values must be set, along with those for all of 382 * that view's descendants. A view's measured width and measured height values 383 * must respect the constraints imposed by the view's parents. This guarantees 384 * that at the end of the measure pass, all parents accept all of their 385 * children's measurements. A parent view may call measure() more than once on 386 * its children. For example, the parent may measure each child once with 387 * unspecified dimensions to find out how big they want to be, then call 388 * measure() on them again with actual numbers if the sum of all the children's 389 * unconstrained sizes is too big or too small. 390 * </p> 391 * 392 * <p> 393 * The measure pass uses two classes to communicate dimensions. The 394 * {@link MeasureSpec} class is used by views to tell their parents how they 395 * want to be measured and positioned. The base LayoutParams class just 396 * describes how big the view wants to be for both width and height. For each 397 * dimension, it can specify one of: 398 * <ul> 399 * <li> an exact number 400 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 401 * (minus padding) 402 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 403 * enclose its content (plus padding). 404 * </ul> 405 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 406 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 407 * an X and Y value. 408 * </p> 409 * 410 * <p> 411 * MeasureSpecs are used to push requirements down the tree from parent to 412 * child. A MeasureSpec can be in one of three modes: 413 * <ul> 414 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 415 * of a child view. For example, a LinearLayout may call measure() on its child 416 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 417 * tall the child view wants to be given a width of 240 pixels. 418 * <li>EXACTLY: This is used by the parent to impose an exact size on the 419 * child. The child must use this size, and guarantee that all of its 420 * descendants will fit within this size. 421 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 422 * child. The child must gurantee that it and all of its descendants will fit 423 * within this size. 424 * </ul> 425 * </p> 426 * 427 * <p> 428 * To intiate a layout, call {@link #requestLayout}. This method is typically 429 * called by a view on itself when it believes that is can no longer fit within 430 * its current bounds. 431 * </p> 432 * 433 * <a name="Drawing"></a> 434 * <h3>Drawing</h3> 435 * <p> 436 * Drawing is handled by walking the tree and rendering each view that 437 * intersects the invalid region. Because the tree is traversed in-order, 438 * this means that parents will draw before (i.e., behind) their children, with 439 * siblings drawn in the order they appear in the tree. 440 * If you set a background drawable for a View, then the View will draw it for you 441 * before calling back to its <code>onDraw()</code> method. 442 * </p> 443 * 444 * <p> 445 * Note that the framework will not draw views that are not in the invalid region. 446 * </p> 447 * 448 * <p> 449 * To force a view to draw, call {@link #invalidate()}. 450 * </p> 451 * 452 * <a name="EventHandlingThreading"></a> 453 * <h3>Event Handling and Threading</h3> 454 * <p> 455 * The basic cycle of a view is as follows: 456 * <ol> 457 * <li>An event comes in and is dispatched to the appropriate view. The view 458 * handles the event and notifies any listeners.</li> 459 * <li>If in the course of processing the event, the view's bounds may need 460 * to be changed, the view will call {@link #requestLayout()}.</li> 461 * <li>Similarly, if in the course of processing the event the view's appearance 462 * may need to be changed, the view will call {@link #invalidate()}.</li> 463 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 464 * the framework will take care of measuring, laying out, and drawing the tree 465 * as appropriate.</li> 466 * </ol> 467 * </p> 468 * 469 * <p><em>Note: The entire view tree is single threaded. You must always be on 470 * the UI thread when calling any method on any view.</em> 471 * If you are doing work on other threads and want to update the state of a view 472 * from that thread, you should use a {@link Handler}. 473 * </p> 474 * 475 * <a name="FocusHandling"></a> 476 * <h3>Focus Handling</h3> 477 * <p> 478 * The framework will handle routine focus movement in response to user input. 479 * This includes changing the focus as views are removed or hidden, or as new 480 * views become available. Views indicate their willingness to take focus 481 * through the {@link #isFocusable} method. To change whether a view can take 482 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 483 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 484 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 485 * </p> 486 * <p> 487 * Focus movement is based on an algorithm which finds the nearest neighbor in a 488 * given direction. In rare cases, the default algorithm may not match the 489 * intended behavior of the developer. In these situations, you can provide 490 * explicit overrides by using these XML attributes in the layout file: 491 * <pre> 492 * nextFocusDown 493 * nextFocusLeft 494 * nextFocusRight 495 * nextFocusUp 496 * </pre> 497 * </p> 498 * 499 * 500 * <p> 501 * To get a particular view to take focus, call {@link #requestFocus()}. 502 * </p> 503 * 504 * <a name="TouchMode"></a> 505 * <h3>Touch Mode</h3> 506 * <p> 507 * When a user is navigating a user interface via directional keys such as a D-pad, it is 508 * necessary to give focus to actionable items such as buttons so the user can see 509 * what will take input. If the device has touch capabilities, however, and the user 510 * begins interacting with the interface by touching it, it is no longer necessary to 511 * always highlight, or give focus to, a particular view. This motivates a mode 512 * for interaction named 'touch mode'. 513 * </p> 514 * <p> 515 * For a touch capable device, once the user touches the screen, the device 516 * will enter touch mode. From this point onward, only views for which 517 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 518 * Other views that are touchable, like buttons, will not take focus when touched; they will 519 * only fire the on click listeners. 520 * </p> 521 * <p> 522 * Any time a user hits a directional key, such as a D-pad direction, the view device will 523 * exit touch mode, and find a view to take focus, so that the user may resume interacting 524 * with the user interface without touching the screen again. 525 * </p> 526 * <p> 527 * The touch mode state is maintained across {@link android.app.Activity}s. Call 528 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 529 * </p> 530 * 531 * <a name="Scrolling"></a> 532 * <h3>Scrolling</h3> 533 * <p> 534 * The framework provides basic support for views that wish to internally 535 * scroll their content. This includes keeping track of the X and Y scroll 536 * offset as well as mechanisms for drawing scrollbars. See 537 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 538 * {@link #awakenScrollBars()} for more details. 539 * </p> 540 * 541 * <a name="Tags"></a> 542 * <h3>Tags</h3> 543 * <p> 544 * Unlike IDs, tags are not used to identify views. Tags are essentially an 545 * extra piece of information that can be associated with a view. They are most 546 * often used as a convenience to store data related to views in the views 547 * themselves rather than by putting them in a separate structure. 548 * </p> 549 * 550 * <a name="Properties"></a> 551 * <h3>Properties</h3> 552 * <p> 553 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 554 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 555 * available both in the {@link Property} form as well as in similarly-named setter/getter 556 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 557 * be used to set persistent state associated with these rendering-related properties on the view. 558 * The properties and methods can also be used in conjunction with 559 * {@link android.animation.Animator Animator}-based animations, described more in the 560 * <a href="#Animation">Animation</a> section. 561 * </p> 562 * 563 * <a name="Animation"></a> 564 * <h3>Animation</h3> 565 * <p> 566 * Starting with Android 3.0, the preferred way of animating views is to use the 567 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 568 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 569 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 570 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 571 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 572 * makes animating these View properties particularly easy and efficient. 573 * </p> 574 * <p> 575 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 576 * You can attach an {@link Animation} object to a view using 577 * {@link #setAnimation(Animation)} or 578 * {@link #startAnimation(Animation)}. The animation can alter the scale, 579 * rotation, translation and alpha of a view over time. If the animation is 580 * attached to a view that has children, the animation will affect the entire 581 * subtree rooted by that node. When an animation is started, the framework will 582 * take care of redrawing the appropriate views until the animation completes. 583 * </p> 584 * 585 * <a name="Security"></a> 586 * <h3>Security</h3> 587 * <p> 588 * Sometimes it is essential that an application be able to verify that an action 589 * is being performed with the full knowledge and consent of the user, such as 590 * granting a permission request, making a purchase or clicking on an advertisement. 591 * Unfortunately, a malicious application could try to spoof the user into 592 * performing these actions, unaware, by concealing the intended purpose of the view. 593 * As a remedy, the framework offers a touch filtering mechanism that can be used to 594 * improve the security of views that provide access to sensitive functionality. 595 * </p><p> 596 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 597 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 598 * will discard touches that are received whenever the view's window is obscured by 599 * another visible window. As a result, the view will not receive touches whenever a 600 * toast, dialog or other window appears above the view's window. 601 * </p><p> 602 * For more fine-grained control over security, consider overriding the 603 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 604 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 605 * </p> 606 * 607 * @attr ref android.R.styleable#View_alpha 608 * @attr ref android.R.styleable#View_background 609 * @attr ref android.R.styleable#View_clickable 610 * @attr ref android.R.styleable#View_contentDescription 611 * @attr ref android.R.styleable#View_drawingCacheQuality 612 * @attr ref android.R.styleable#View_duplicateParentState 613 * @attr ref android.R.styleable#View_id 614 * @attr ref android.R.styleable#View_requiresFadingEdge 615 * @attr ref android.R.styleable#View_fadeScrollbars 616 * @attr ref android.R.styleable#View_fadingEdgeLength 617 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 618 * @attr ref android.R.styleable#View_fitsSystemWindows 619 * @attr ref android.R.styleable#View_isScrollContainer 620 * @attr ref android.R.styleable#View_focusable 621 * @attr ref android.R.styleable#View_focusableInTouchMode 622 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 623 * @attr ref android.R.styleable#View_keepScreenOn 624 * @attr ref android.R.styleable#View_layerType 625 * @attr ref android.R.styleable#View_layoutDirection 626 * @attr ref android.R.styleable#View_longClickable 627 * @attr ref android.R.styleable#View_minHeight 628 * @attr ref android.R.styleable#View_minWidth 629 * @attr ref android.R.styleable#View_nextFocusDown 630 * @attr ref android.R.styleable#View_nextFocusLeft 631 * @attr ref android.R.styleable#View_nextFocusRight 632 * @attr ref android.R.styleable#View_nextFocusUp 633 * @attr ref android.R.styleable#View_onClick 634 * @attr ref android.R.styleable#View_padding 635 * @attr ref android.R.styleable#View_paddingBottom 636 * @attr ref android.R.styleable#View_paddingLeft 637 * @attr ref android.R.styleable#View_paddingRight 638 * @attr ref android.R.styleable#View_paddingTop 639 * @attr ref android.R.styleable#View_paddingStart 640 * @attr ref android.R.styleable#View_paddingEnd 641 * @attr ref android.R.styleable#View_saveEnabled 642 * @attr ref android.R.styleable#View_rotation 643 * @attr ref android.R.styleable#View_rotationX 644 * @attr ref android.R.styleable#View_rotationY 645 * @attr ref android.R.styleable#View_scaleX 646 * @attr ref android.R.styleable#View_scaleY 647 * @attr ref android.R.styleable#View_scrollX 648 * @attr ref android.R.styleable#View_scrollY 649 * @attr ref android.R.styleable#View_scrollbarSize 650 * @attr ref android.R.styleable#View_scrollbarStyle 651 * @attr ref android.R.styleable#View_scrollbars 652 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 653 * @attr ref android.R.styleable#View_scrollbarFadeDuration 654 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 655 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 656 * @attr ref android.R.styleable#View_scrollbarThumbVertical 657 * @attr ref android.R.styleable#View_scrollbarTrackVertical 658 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 659 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 660 * @attr ref android.R.styleable#View_soundEffectsEnabled 661 * @attr ref android.R.styleable#View_tag 662 * @attr ref android.R.styleable#View_textAlignment 663 * @attr ref android.R.styleable#View_textDirection 664 * @attr ref android.R.styleable#View_transformPivotX 665 * @attr ref android.R.styleable#View_transformPivotY 666 * @attr ref android.R.styleable#View_translationX 667 * @attr ref android.R.styleable#View_translationY 668 * @attr ref android.R.styleable#View_visibility 669 * 670 * @see android.view.ViewGroup 671 */ 672public class View implements Drawable.Callback, KeyEvent.Callback, 673 AccessibilityEventSource { 674 private static final boolean DBG = false; 675 676 /** 677 * The logging tag used by this class with android.util.Log. 678 */ 679 protected static final String VIEW_LOG_TAG = "View"; 680 681 /** 682 * When set to true, apps will draw debugging information about their layouts. 683 * 684 * @hide 685 */ 686 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 687 688 /** 689 * Used to mark a View that has no ID. 690 */ 691 public static final int NO_ID = -1; 692 693 private static boolean sUseBrokenMakeMeasureSpec = false; 694 695 /** 696 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 697 * calling setFlags. 698 */ 699 private static final int NOT_FOCUSABLE = 0x00000000; 700 701 /** 702 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 703 * setFlags. 704 */ 705 private static final int FOCUSABLE = 0x00000001; 706 707 /** 708 * Mask for use with setFlags indicating bits used for focus. 709 */ 710 private static final int FOCUSABLE_MASK = 0x00000001; 711 712 /** 713 * This view will adjust its padding to fit sytem windows (e.g. status bar) 714 */ 715 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 716 717 /** 718 * This view is visible. 719 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 720 * android:visibility}. 721 */ 722 public static final int VISIBLE = 0x00000000; 723 724 /** 725 * This view is invisible, but it still takes up space for layout purposes. 726 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 727 * android:visibility}. 728 */ 729 public static final int INVISIBLE = 0x00000004; 730 731 /** 732 * This view is invisible, and it doesn't take any space for layout 733 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 734 * android:visibility}. 735 */ 736 public static final int GONE = 0x00000008; 737 738 /** 739 * Mask for use with setFlags indicating bits used for visibility. 740 * {@hide} 741 */ 742 static final int VISIBILITY_MASK = 0x0000000C; 743 744 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 745 746 /** 747 * This view is enabled. Interpretation varies by subclass. 748 * Use with ENABLED_MASK when calling setFlags. 749 * {@hide} 750 */ 751 static final int ENABLED = 0x00000000; 752 753 /** 754 * This view is disabled. Interpretation varies by subclass. 755 * Use with ENABLED_MASK when calling setFlags. 756 * {@hide} 757 */ 758 static final int DISABLED = 0x00000020; 759 760 /** 761 * Mask for use with setFlags indicating bits used for indicating whether 762 * this view is enabled 763 * {@hide} 764 */ 765 static final int ENABLED_MASK = 0x00000020; 766 767 /** 768 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 769 * called and further optimizations will be performed. It is okay to have 770 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 771 * {@hide} 772 */ 773 static final int WILL_NOT_DRAW = 0x00000080; 774 775 /** 776 * Mask for use with setFlags indicating bits used for indicating whether 777 * this view is will draw 778 * {@hide} 779 */ 780 static final int DRAW_MASK = 0x00000080; 781 782 /** 783 * <p>This view doesn't show scrollbars.</p> 784 * {@hide} 785 */ 786 static final int SCROLLBARS_NONE = 0x00000000; 787 788 /** 789 * <p>This view shows horizontal scrollbars.</p> 790 * {@hide} 791 */ 792 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 793 794 /** 795 * <p>This view shows vertical scrollbars.</p> 796 * {@hide} 797 */ 798 static final int SCROLLBARS_VERTICAL = 0x00000200; 799 800 /** 801 * <p>Mask for use with setFlags indicating bits used for indicating which 802 * scrollbars are enabled.</p> 803 * {@hide} 804 */ 805 static final int SCROLLBARS_MASK = 0x00000300; 806 807 /** 808 * Indicates that the view should filter touches when its window is obscured. 809 * Refer to the class comments for more information about this security feature. 810 * {@hide} 811 */ 812 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 813 814 /** 815 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 816 * that they are optional and should be skipped if the window has 817 * requested system UI flags that ignore those insets for layout. 818 */ 819 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 820 821 /** 822 * <p>This view doesn't show fading edges.</p> 823 * {@hide} 824 */ 825 static final int FADING_EDGE_NONE = 0x00000000; 826 827 /** 828 * <p>This view shows horizontal fading edges.</p> 829 * {@hide} 830 */ 831 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 832 833 /** 834 * <p>This view shows vertical fading edges.</p> 835 * {@hide} 836 */ 837 static final int FADING_EDGE_VERTICAL = 0x00002000; 838 839 /** 840 * <p>Mask for use with setFlags indicating bits used for indicating which 841 * fading edges are enabled.</p> 842 * {@hide} 843 */ 844 static final int FADING_EDGE_MASK = 0x00003000; 845 846 /** 847 * <p>Indicates this view can be clicked. When clickable, a View reacts 848 * to clicks by notifying the OnClickListener.<p> 849 * {@hide} 850 */ 851 static final int CLICKABLE = 0x00004000; 852 853 /** 854 * <p>Indicates this view is caching its drawing into a bitmap.</p> 855 * {@hide} 856 */ 857 static final int DRAWING_CACHE_ENABLED = 0x00008000; 858 859 /** 860 * <p>Indicates that no icicle should be saved for this view.<p> 861 * {@hide} 862 */ 863 static final int SAVE_DISABLED = 0x000010000; 864 865 /** 866 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 867 * property.</p> 868 * {@hide} 869 */ 870 static final int SAVE_DISABLED_MASK = 0x000010000; 871 872 /** 873 * <p>Indicates that no drawing cache should ever be created for this view.<p> 874 * {@hide} 875 */ 876 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 877 878 /** 879 * <p>Indicates this view can take / keep focus when int touch mode.</p> 880 * {@hide} 881 */ 882 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 883 884 /** 885 * <p>Enables low quality mode for the drawing cache.</p> 886 */ 887 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 888 889 /** 890 * <p>Enables high quality mode for the drawing cache.</p> 891 */ 892 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 893 894 /** 895 * <p>Enables automatic quality mode for the drawing cache.</p> 896 */ 897 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 898 899 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 900 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 901 }; 902 903 /** 904 * <p>Mask for use with setFlags indicating bits used for the cache 905 * quality property.</p> 906 * {@hide} 907 */ 908 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 909 910 /** 911 * <p> 912 * Indicates this view can be long clicked. When long clickable, a View 913 * reacts to long clicks by notifying the OnLongClickListener or showing a 914 * context menu. 915 * </p> 916 * {@hide} 917 */ 918 static final int LONG_CLICKABLE = 0x00200000; 919 920 /** 921 * <p>Indicates that this view gets its drawable states from its direct parent 922 * and ignores its original internal states.</p> 923 * 924 * @hide 925 */ 926 static final int DUPLICATE_PARENT_STATE = 0x00400000; 927 928 /** 929 * The scrollbar style to display the scrollbars inside the content area, 930 * without increasing the padding. The scrollbars will be overlaid with 931 * translucency on the view's content. 932 */ 933 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 934 935 /** 936 * The scrollbar style to display the scrollbars inside the padded area, 937 * increasing the padding of the view. The scrollbars will not overlap the 938 * content area of the view. 939 */ 940 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 941 942 /** 943 * The scrollbar style to display the scrollbars at the edge of the view, 944 * without increasing the padding. The scrollbars will be overlaid with 945 * translucency. 946 */ 947 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 948 949 /** 950 * The scrollbar style to display the scrollbars at the edge of the view, 951 * increasing the padding of the view. The scrollbars will only overlap the 952 * background, if any. 953 */ 954 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 955 956 /** 957 * Mask to check if the scrollbar style is overlay or inset. 958 * {@hide} 959 */ 960 static final int SCROLLBARS_INSET_MASK = 0x01000000; 961 962 /** 963 * Mask to check if the scrollbar style is inside or outside. 964 * {@hide} 965 */ 966 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 967 968 /** 969 * Mask for scrollbar style. 970 * {@hide} 971 */ 972 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 973 974 /** 975 * View flag indicating that the screen should remain on while the 976 * window containing this view is visible to the user. This effectively 977 * takes care of automatically setting the WindowManager's 978 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 979 */ 980 public static final int KEEP_SCREEN_ON = 0x04000000; 981 982 /** 983 * View flag indicating whether this view should have sound effects enabled 984 * for events such as clicking and touching. 985 */ 986 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 987 988 /** 989 * View flag indicating whether this view should have haptic feedback 990 * enabled for events such as long presses. 991 */ 992 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 993 994 /** 995 * <p>Indicates that the view hierarchy should stop saving state when 996 * it reaches this view. If state saving is initiated immediately at 997 * the view, it will be allowed. 998 * {@hide} 999 */ 1000 static final int PARENT_SAVE_DISABLED = 0x20000000; 1001 1002 /** 1003 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1004 * {@hide} 1005 */ 1006 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1007 1008 /** 1009 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1010 * should add all focusable Views regardless if they are focusable in touch mode. 1011 */ 1012 public static final int FOCUSABLES_ALL = 0x00000000; 1013 1014 /** 1015 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1016 * should add only Views focusable in touch mode. 1017 */ 1018 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1019 1020 /** 1021 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1022 * item. 1023 */ 1024 public static final int FOCUS_BACKWARD = 0x00000001; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1028 * item. 1029 */ 1030 public static final int FOCUS_FORWARD = 0x00000002; 1031 1032 /** 1033 * Use with {@link #focusSearch(int)}. Move focus to the left. 1034 */ 1035 public static final int FOCUS_LEFT = 0x00000011; 1036 1037 /** 1038 * Use with {@link #focusSearch(int)}. Move focus up. 1039 */ 1040 public static final int FOCUS_UP = 0x00000021; 1041 1042 /** 1043 * Use with {@link #focusSearch(int)}. Move focus to the right. 1044 */ 1045 public static final int FOCUS_RIGHT = 0x00000042; 1046 1047 /** 1048 * Use with {@link #focusSearch(int)}. Move focus down. 1049 */ 1050 public static final int FOCUS_DOWN = 0x00000082; 1051 1052 /** 1053 * Bits of {@link #getMeasuredWidthAndState()} and 1054 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1055 */ 1056 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1057 1058 /** 1059 * Bits of {@link #getMeasuredWidthAndState()} and 1060 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1061 */ 1062 public static final int MEASURED_STATE_MASK = 0xff000000; 1063 1064 /** 1065 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1066 * for functions that combine both width and height into a single int, 1067 * such as {@link #getMeasuredState()} and the childState argument of 1068 * {@link #resolveSizeAndState(int, int, int)}. 1069 */ 1070 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1071 1072 /** 1073 * Bit of {@link #getMeasuredWidthAndState()} and 1074 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1075 * is smaller that the space the view would like to have. 1076 */ 1077 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1078 1079 /** 1080 * Base View state sets 1081 */ 1082 // Singles 1083 /** 1084 * Indicates the view has no states set. States are used with 1085 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1086 * view depending on its state. 1087 * 1088 * @see android.graphics.drawable.Drawable 1089 * @see #getDrawableState() 1090 */ 1091 protected static final int[] EMPTY_STATE_SET; 1092 /** 1093 * Indicates the view is enabled. States are used with 1094 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1095 * view depending on its state. 1096 * 1097 * @see android.graphics.drawable.Drawable 1098 * @see #getDrawableState() 1099 */ 1100 protected static final int[] ENABLED_STATE_SET; 1101 /** 1102 * Indicates the view is focused. States are used with 1103 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1104 * view depending on its state. 1105 * 1106 * @see android.graphics.drawable.Drawable 1107 * @see #getDrawableState() 1108 */ 1109 protected static final int[] FOCUSED_STATE_SET; 1110 /** 1111 * Indicates the view is selected. States are used with 1112 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1113 * view depending on its state. 1114 * 1115 * @see android.graphics.drawable.Drawable 1116 * @see #getDrawableState() 1117 */ 1118 protected static final int[] SELECTED_STATE_SET; 1119 /** 1120 * Indicates the view is pressed. States are used with 1121 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1122 * view depending on its state. 1123 * 1124 * @see android.graphics.drawable.Drawable 1125 * @see #getDrawableState() 1126 */ 1127 protected static final int[] PRESSED_STATE_SET; 1128 /** 1129 * Indicates the view's window has focus. States are used with 1130 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1131 * view depending on its state. 1132 * 1133 * @see android.graphics.drawable.Drawable 1134 * @see #getDrawableState() 1135 */ 1136 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1137 // Doubles 1138 /** 1139 * Indicates the view is enabled and has the focus. 1140 * 1141 * @see #ENABLED_STATE_SET 1142 * @see #FOCUSED_STATE_SET 1143 */ 1144 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1145 /** 1146 * Indicates the view is enabled and selected. 1147 * 1148 * @see #ENABLED_STATE_SET 1149 * @see #SELECTED_STATE_SET 1150 */ 1151 protected static final int[] ENABLED_SELECTED_STATE_SET; 1152 /** 1153 * Indicates the view is enabled and that its window has focus. 1154 * 1155 * @see #ENABLED_STATE_SET 1156 * @see #WINDOW_FOCUSED_STATE_SET 1157 */ 1158 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1159 /** 1160 * Indicates the view is focused and selected. 1161 * 1162 * @see #FOCUSED_STATE_SET 1163 * @see #SELECTED_STATE_SET 1164 */ 1165 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1166 /** 1167 * Indicates the view has the focus and that its window has the focus. 1168 * 1169 * @see #FOCUSED_STATE_SET 1170 * @see #WINDOW_FOCUSED_STATE_SET 1171 */ 1172 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1173 /** 1174 * Indicates the view is selected and that its window has the focus. 1175 * 1176 * @see #SELECTED_STATE_SET 1177 * @see #WINDOW_FOCUSED_STATE_SET 1178 */ 1179 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1180 // Triples 1181 /** 1182 * Indicates the view is enabled, focused and selected. 1183 * 1184 * @see #ENABLED_STATE_SET 1185 * @see #FOCUSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 */ 1188 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1189 /** 1190 * Indicates the view is enabled, focused and its window has the focus. 1191 * 1192 * @see #ENABLED_STATE_SET 1193 * @see #FOCUSED_STATE_SET 1194 * @see #WINDOW_FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is enabled, selected and its window has the focus. 1199 * 1200 * @see #ENABLED_STATE_SET 1201 * @see #SELECTED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is focused, selected and its window has the focus. 1207 * 1208 * @see #FOCUSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #WINDOW_FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1213 /** 1214 * Indicates the view is enabled, focused, selected and its window 1215 * has the focus. 1216 * 1217 * @see #ENABLED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 * @see #SELECTED_STATE_SET 1220 * @see #WINDOW_FOCUSED_STATE_SET 1221 */ 1222 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1223 /** 1224 * Indicates the view is pressed and its window has the focus. 1225 * 1226 * @see #PRESSED_STATE_SET 1227 * @see #WINDOW_FOCUSED_STATE_SET 1228 */ 1229 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1230 /** 1231 * Indicates the view is pressed and selected. 1232 * 1233 * @see #PRESSED_STATE_SET 1234 * @see #SELECTED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_SELECTED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, selected and its window has the focus. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #SELECTED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed and focused. 1247 * 1248 * @see #PRESSED_STATE_SET 1249 * @see #FOCUSED_STATE_SET 1250 */ 1251 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1252 /** 1253 * Indicates the view is pressed, focused and its window has the focus. 1254 * 1255 * @see #PRESSED_STATE_SET 1256 * @see #FOCUSED_STATE_SET 1257 * @see #WINDOW_FOCUSED_STATE_SET 1258 */ 1259 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1260 /** 1261 * Indicates the view is pressed, focused and selected. 1262 * 1263 * @see #PRESSED_STATE_SET 1264 * @see #SELECTED_STATE_SET 1265 * @see #FOCUSED_STATE_SET 1266 */ 1267 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1268 /** 1269 * Indicates the view is pressed, focused, selected and its window has the focus. 1270 * 1271 * @see #PRESSED_STATE_SET 1272 * @see #FOCUSED_STATE_SET 1273 * @see #SELECTED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed and enabled. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #ENABLED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_ENABLED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, enabled and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #ENABLED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed, enabled and selected. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #ENABLED_STATE_SET 1297 * @see #SELECTED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, enabled, selected and its window has the 1302 * focus. 1303 * 1304 * @see #PRESSED_STATE_SET 1305 * @see #ENABLED_STATE_SET 1306 * @see #SELECTED_STATE_SET 1307 * @see #WINDOW_FOCUSED_STATE_SET 1308 */ 1309 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1310 /** 1311 * Indicates the view is pressed, enabled and focused. 1312 * 1313 * @see #PRESSED_STATE_SET 1314 * @see #ENABLED_STATE_SET 1315 * @see #FOCUSED_STATE_SET 1316 */ 1317 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1318 /** 1319 * Indicates the view is pressed, enabled, focused and its window has the 1320 * focus. 1321 * 1322 * @see #PRESSED_STATE_SET 1323 * @see #ENABLED_STATE_SET 1324 * @see #FOCUSED_STATE_SET 1325 * @see #WINDOW_FOCUSED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, enabled, focused and selected. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #ENABLED_STATE_SET 1333 * @see #SELECTED_STATE_SET 1334 * @see #FOCUSED_STATE_SET 1335 */ 1336 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1337 /** 1338 * Indicates the view is pressed, enabled, focused, selected and its window 1339 * has the focus. 1340 * 1341 * @see #PRESSED_STATE_SET 1342 * @see #ENABLED_STATE_SET 1343 * @see #SELECTED_STATE_SET 1344 * @see #FOCUSED_STATE_SET 1345 * @see #WINDOW_FOCUSED_STATE_SET 1346 */ 1347 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1348 1349 /** 1350 * The order here is very important to {@link #getDrawableState()} 1351 */ 1352 private static final int[][] VIEW_STATE_SETS; 1353 1354 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1355 static final int VIEW_STATE_SELECTED = 1 << 1; 1356 static final int VIEW_STATE_FOCUSED = 1 << 2; 1357 static final int VIEW_STATE_ENABLED = 1 << 3; 1358 static final int VIEW_STATE_PRESSED = 1 << 4; 1359 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1360 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1361 static final int VIEW_STATE_HOVERED = 1 << 7; 1362 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1363 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1364 1365 static final int[] VIEW_STATE_IDS = new int[] { 1366 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1367 R.attr.state_selected, VIEW_STATE_SELECTED, 1368 R.attr.state_focused, VIEW_STATE_FOCUSED, 1369 R.attr.state_enabled, VIEW_STATE_ENABLED, 1370 R.attr.state_pressed, VIEW_STATE_PRESSED, 1371 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1372 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1373 R.attr.state_hovered, VIEW_STATE_HOVERED, 1374 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1375 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1376 }; 1377 1378 static { 1379 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1380 throw new IllegalStateException( 1381 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1382 } 1383 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1384 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1385 int viewState = R.styleable.ViewDrawableStates[i]; 1386 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1387 if (VIEW_STATE_IDS[j] == viewState) { 1388 orderedIds[i * 2] = viewState; 1389 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1390 } 1391 } 1392 } 1393 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1394 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1395 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1396 int numBits = Integer.bitCount(i); 1397 int[] set = new int[numBits]; 1398 int pos = 0; 1399 for (int j = 0; j < orderedIds.length; j += 2) { 1400 if ((i & orderedIds[j+1]) != 0) { 1401 set[pos++] = orderedIds[j]; 1402 } 1403 } 1404 VIEW_STATE_SETS[i] = set; 1405 } 1406 1407 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1408 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1409 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1410 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1412 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1413 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1415 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1417 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1419 | VIEW_STATE_FOCUSED]; 1420 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1421 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1423 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1425 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1427 | VIEW_STATE_ENABLED]; 1428 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1429 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1430 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1431 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1432 | VIEW_STATE_ENABLED]; 1433 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1434 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1435 | VIEW_STATE_ENABLED]; 1436 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1437 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1438 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1439 1440 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1441 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1443 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1445 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1447 | VIEW_STATE_PRESSED]; 1448 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1449 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1450 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1452 | VIEW_STATE_PRESSED]; 1453 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1455 | VIEW_STATE_PRESSED]; 1456 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1457 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1458 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1459 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1461 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1463 | VIEW_STATE_PRESSED]; 1464 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1466 | VIEW_STATE_PRESSED]; 1467 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1468 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1469 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1470 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1471 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1472 | VIEW_STATE_PRESSED]; 1473 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1475 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1476 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1477 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1478 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1479 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1481 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1482 | VIEW_STATE_PRESSED]; 1483 } 1484 1485 /** 1486 * Accessibility event types that are dispatched for text population. 1487 */ 1488 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1489 AccessibilityEvent.TYPE_VIEW_CLICKED 1490 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1491 | AccessibilityEvent.TYPE_VIEW_SELECTED 1492 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1493 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1494 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1495 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1496 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1497 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1498 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1499 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1500 1501 /** 1502 * Temporary Rect currently for use in setBackground(). This will probably 1503 * be extended in the future to hold our own class with more than just 1504 * a Rect. :) 1505 */ 1506 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1507 1508 /** 1509 * Map used to store views' tags. 1510 */ 1511 private SparseArray<Object> mKeyedTags; 1512 1513 /** 1514 * The next available accessibility id. 1515 */ 1516 private static int sNextAccessibilityViewId; 1517 1518 /** 1519 * The animation currently associated with this view. 1520 * @hide 1521 */ 1522 protected Animation mCurrentAnimation = null; 1523 1524 /** 1525 * Width as measured during measure pass. 1526 * {@hide} 1527 */ 1528 @ViewDebug.ExportedProperty(category = "measurement") 1529 int mMeasuredWidth; 1530 1531 /** 1532 * Height as measured during measure pass. 1533 * {@hide} 1534 */ 1535 @ViewDebug.ExportedProperty(category = "measurement") 1536 int mMeasuredHeight; 1537 1538 /** 1539 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1540 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1541 * its display list. This flag, used only when hw accelerated, allows us to clear the 1542 * flag while retaining this information until it's needed (at getDisplayList() time and 1543 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1544 * 1545 * {@hide} 1546 */ 1547 boolean mRecreateDisplayList = false; 1548 1549 /** 1550 * The view's identifier. 1551 * {@hide} 1552 * 1553 * @see #setId(int) 1554 * @see #getId() 1555 */ 1556 @ViewDebug.ExportedProperty(resolveId = true) 1557 int mID = NO_ID; 1558 1559 /** 1560 * The stable ID of this view for accessibility purposes. 1561 */ 1562 int mAccessibilityViewId = NO_ID; 1563 1564 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1565 1566 SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent; 1567 1568 /** 1569 * The view's tag. 1570 * {@hide} 1571 * 1572 * @see #setTag(Object) 1573 * @see #getTag() 1574 */ 1575 protected Object mTag; 1576 1577 private Scene mCurrentScene = null; 1578 1579 // for mPrivateFlags: 1580 /** {@hide} */ 1581 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1582 /** {@hide} */ 1583 static final int PFLAG_FOCUSED = 0x00000002; 1584 /** {@hide} */ 1585 static final int PFLAG_SELECTED = 0x00000004; 1586 /** {@hide} */ 1587 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1588 /** {@hide} */ 1589 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1590 /** {@hide} */ 1591 static final int PFLAG_DRAWN = 0x00000020; 1592 /** 1593 * When this flag is set, this view is running an animation on behalf of its 1594 * children and should therefore not cancel invalidate requests, even if they 1595 * lie outside of this view's bounds. 1596 * 1597 * {@hide} 1598 */ 1599 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1600 /** {@hide} */ 1601 static final int PFLAG_SKIP_DRAW = 0x00000080; 1602 /** {@hide} */ 1603 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1604 /** {@hide} */ 1605 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1606 /** {@hide} */ 1607 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1608 /** {@hide} */ 1609 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1610 /** {@hide} */ 1611 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1612 /** {@hide} */ 1613 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1614 1615 private static final int PFLAG_PRESSED = 0x00004000; 1616 1617 /** {@hide} */ 1618 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1619 /** 1620 * Flag used to indicate that this view should be drawn once more (and only once 1621 * more) after its animation has completed. 1622 * {@hide} 1623 */ 1624 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1625 1626 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1627 1628 /** 1629 * Indicates that the View returned true when onSetAlpha() was called and that 1630 * the alpha must be restored. 1631 * {@hide} 1632 */ 1633 static final int PFLAG_ALPHA_SET = 0x00040000; 1634 1635 /** 1636 * Set by {@link #setScrollContainer(boolean)}. 1637 */ 1638 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1639 1640 /** 1641 * Set by {@link #setScrollContainer(boolean)}. 1642 */ 1643 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1644 1645 /** 1646 * View flag indicating whether this view was invalidated (fully or partially.) 1647 * 1648 * @hide 1649 */ 1650 static final int PFLAG_DIRTY = 0x00200000; 1651 1652 /** 1653 * View flag indicating whether this view was invalidated by an opaque 1654 * invalidate request. 1655 * 1656 * @hide 1657 */ 1658 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1659 1660 /** 1661 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1662 * 1663 * @hide 1664 */ 1665 static final int PFLAG_DIRTY_MASK = 0x00600000; 1666 1667 /** 1668 * Indicates whether the background is opaque. 1669 * 1670 * @hide 1671 */ 1672 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1673 1674 /** 1675 * Indicates whether the scrollbars are opaque. 1676 * 1677 * @hide 1678 */ 1679 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1680 1681 /** 1682 * Indicates whether the view is opaque. 1683 * 1684 * @hide 1685 */ 1686 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1687 1688 /** 1689 * Indicates a prepressed state; 1690 * the short time between ACTION_DOWN and recognizing 1691 * a 'real' press. Prepressed is used to recognize quick taps 1692 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1693 * 1694 * @hide 1695 */ 1696 private static final int PFLAG_PREPRESSED = 0x02000000; 1697 1698 /** 1699 * Indicates whether the view is temporarily detached. 1700 * 1701 * @hide 1702 */ 1703 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1704 1705 /** 1706 * Indicates that we should awaken scroll bars once attached 1707 * 1708 * @hide 1709 */ 1710 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1711 1712 /** 1713 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1714 * @hide 1715 */ 1716 private static final int PFLAG_HOVERED = 0x10000000; 1717 1718 /** 1719 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1720 * for transform operations 1721 * 1722 * @hide 1723 */ 1724 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1725 1726 /** {@hide} */ 1727 static final int PFLAG_ACTIVATED = 0x40000000; 1728 1729 /** 1730 * Indicates that this view was specifically invalidated, not just dirtied because some 1731 * child view was invalidated. The flag is used to determine when we need to recreate 1732 * a view's display list (as opposed to just returning a reference to its existing 1733 * display list). 1734 * 1735 * @hide 1736 */ 1737 static final int PFLAG_INVALIDATED = 0x80000000; 1738 1739 /** 1740 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1741 * 1742 * -------|-------|-------|-------| 1743 * PFLAG2_TEXT_ALIGNMENT_FLAGS[0] 1744 * PFLAG2_TEXT_DIRECTION_FLAGS[0] 1745 * 1 PFLAG2_DRAG_CAN_ACCEPT 1746 * 1 PFLAG2_DRAG_HOVERED 1747 * 1 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT 1748 * 11 PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1749 * 1 1 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT 1750 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1751 * 11 1 PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 1752 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1753 * 1 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT 1754 * 1 1 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT 1755 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1756 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1757 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1758 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1759 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1760 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1761 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1762 * 111 PFLAG2_TEXT_DIRECTION_MASK 1763 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1764 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1765 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1766 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1767 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1768 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1769 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1770 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1771 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1772 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1773 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1774 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1775 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1776 * 11 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1777 * 1 PFLAG2_HAS_TRANSIENT_STATE 1778 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1779 * 1 PFLAG2_ACCESSIBILITY_STATE_CHANGED 1780 * 1 PFLAG2_VIEW_QUICK_REJECTED 1781 * 1 PFLAG2_PADDING_RESOLVED 1782 * -------|-------|-------|-------| 1783 */ 1784 1785 /** 1786 * Indicates that this view has reported that it can accept the current drag's content. 1787 * Cleared when the drag operation concludes. 1788 * @hide 1789 */ 1790 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1791 1792 /** 1793 * Indicates that this view is currently directly under the drag location in a 1794 * drag-and-drop operation involving content that it can accept. Cleared when 1795 * the drag exits the view, or when the drag operation concludes. 1796 * @hide 1797 */ 1798 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1799 1800 /** 1801 * Horizontal layout direction of this view is from Left to Right. 1802 * Use with {@link #setLayoutDirection}. 1803 */ 1804 public static final int LAYOUT_DIRECTION_LTR = 0; 1805 1806 /** 1807 * Horizontal layout direction of this view is from Right to Left. 1808 * Use with {@link #setLayoutDirection}. 1809 */ 1810 public static final int LAYOUT_DIRECTION_RTL = 1; 1811 1812 /** 1813 * Horizontal layout direction of this view is inherited from its parent. 1814 * Use with {@link #setLayoutDirection}. 1815 */ 1816 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1817 1818 /** 1819 * Horizontal layout direction of this view is from deduced from the default language 1820 * script for the locale. Use with {@link #setLayoutDirection}. 1821 */ 1822 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1823 1824 /** 1825 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1826 * @hide 1827 */ 1828 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1829 1830 /** 1831 * Mask for use with private flags indicating bits used for horizontal layout direction. 1832 * @hide 1833 */ 1834 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1835 1836 /** 1837 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1838 * right-to-left direction. 1839 * @hide 1840 */ 1841 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1842 1843 /** 1844 * Indicates whether the view horizontal layout direction has been resolved. 1845 * @hide 1846 */ 1847 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1848 1849 /** 1850 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1851 * @hide 1852 */ 1853 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1854 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1855 1856 /* 1857 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1858 * flag value. 1859 * @hide 1860 */ 1861 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1862 LAYOUT_DIRECTION_LTR, 1863 LAYOUT_DIRECTION_RTL, 1864 LAYOUT_DIRECTION_INHERIT, 1865 LAYOUT_DIRECTION_LOCALE 1866 }; 1867 1868 /** 1869 * Default horizontal layout direction. 1870 */ 1871 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1872 1873 /** 1874 * Default horizontal layout direction. 1875 * @hide 1876 */ 1877 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1878 1879 /** 1880 * Indicates that the view is tracking some sort of transient state 1881 * that the app should not need to be aware of, but that the framework 1882 * should take special care to preserve. 1883 * 1884 * @hide 1885 */ 1886 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x1 << 22; 1887 1888 /** 1889 * Text direction is inherited thru {@link ViewGroup} 1890 */ 1891 public static final int TEXT_DIRECTION_INHERIT = 0; 1892 1893 /** 1894 * Text direction is using "first strong algorithm". The first strong directional character 1895 * determines the paragraph direction. If there is no strong directional character, the 1896 * paragraph direction is the view's resolved layout direction. 1897 */ 1898 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1899 1900 /** 1901 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1902 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1903 * If there are neither, the paragraph direction is the view's resolved layout direction. 1904 */ 1905 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1906 1907 /** 1908 * Text direction is forced to LTR. 1909 */ 1910 public static final int TEXT_DIRECTION_LTR = 3; 1911 1912 /** 1913 * Text direction is forced to RTL. 1914 */ 1915 public static final int TEXT_DIRECTION_RTL = 4; 1916 1917 /** 1918 * Text direction is coming from the system Locale. 1919 */ 1920 public static final int TEXT_DIRECTION_LOCALE = 5; 1921 1922 /** 1923 * Default text direction is inherited 1924 */ 1925 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1926 1927 /** 1928 * Default resolved text direction 1929 * @hide 1930 */ 1931 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 1932 1933 /** 1934 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1935 * @hide 1936 */ 1937 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1938 1939 /** 1940 * Mask for use with private flags indicating bits used for text direction. 1941 * @hide 1942 */ 1943 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1944 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1945 1946 /** 1947 * Array of text direction flags for mapping attribute "textDirection" to correct 1948 * flag value. 1949 * @hide 1950 */ 1951 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1952 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1953 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1954 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1955 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1956 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1957 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1958 }; 1959 1960 /** 1961 * Indicates whether the view text direction has been resolved. 1962 * @hide 1963 */ 1964 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1965 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1966 1967 /** 1968 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1969 * @hide 1970 */ 1971 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1972 1973 /** 1974 * Mask for use with private flags indicating bits used for resolved text direction. 1975 * @hide 1976 */ 1977 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1978 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1979 1980 /** 1981 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1982 * @hide 1983 */ 1984 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1985 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1986 1987 /* 1988 * Default text alignment. The text alignment of this View is inherited from its parent. 1989 * Use with {@link #setTextAlignment(int)} 1990 */ 1991 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1992 1993 /** 1994 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1995 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1996 * 1997 * Use with {@link #setTextAlignment(int)} 1998 */ 1999 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 2000 2001 /** 2002 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 2003 * 2004 * Use with {@link #setTextAlignment(int)} 2005 */ 2006 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2007 2008 /** 2009 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2010 * 2011 * Use with {@link #setTextAlignment(int)} 2012 */ 2013 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2014 2015 /** 2016 * Center the paragraph, e.g. ALIGN_CENTER. 2017 * 2018 * Use with {@link #setTextAlignment(int)} 2019 */ 2020 public static final int TEXT_ALIGNMENT_CENTER = 4; 2021 2022 /** 2023 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2024 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2025 * 2026 * Use with {@link #setTextAlignment(int)} 2027 */ 2028 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2029 2030 /** 2031 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2032 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2033 * 2034 * Use with {@link #setTextAlignment(int)} 2035 */ 2036 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2037 2038 /** 2039 * Default text alignment is inherited 2040 */ 2041 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2042 2043 /** 2044 * Default resolved text alignment 2045 * @hide 2046 */ 2047 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2048 2049 /** 2050 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2051 * @hide 2052 */ 2053 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2054 2055 /** 2056 * Mask for use with private flags indicating bits used for text alignment. 2057 * @hide 2058 */ 2059 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2060 2061 /** 2062 * Array of text direction flags for mapping attribute "textAlignment" to correct 2063 * flag value. 2064 * @hide 2065 */ 2066 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2067 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2068 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2069 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2070 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2071 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2072 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2073 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2074 }; 2075 2076 /** 2077 * Indicates whether the view text alignment has been resolved. 2078 * @hide 2079 */ 2080 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2081 2082 /** 2083 * Bit shift to get the resolved text alignment. 2084 * @hide 2085 */ 2086 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2087 2088 /** 2089 * Mask for use with private flags indicating bits used for text alignment. 2090 * @hide 2091 */ 2092 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2093 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2094 2095 /** 2096 * Indicates whether if the view text alignment has been resolved to gravity 2097 */ 2098 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2099 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2100 2101 // Accessiblity constants for mPrivateFlags2 2102 2103 /** 2104 * Shift for the bits in {@link #mPrivateFlags2} related to the 2105 * "importantForAccessibility" attribute. 2106 */ 2107 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2108 2109 /** 2110 * Automatically determine whether a view is important for accessibility. 2111 */ 2112 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2113 2114 /** 2115 * The view is important for accessibility. 2116 */ 2117 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2118 2119 /** 2120 * The view is not important for accessibility. 2121 */ 2122 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2123 2124 /** 2125 * The default whether the view is important for accessibility. 2126 */ 2127 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2128 2129 /** 2130 * Mask for obtainig the bits which specify how to determine 2131 * whether a view is important for accessibility. 2132 */ 2133 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2134 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2135 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2136 2137 /** 2138 * Flag indicating whether a view has accessibility focus. 2139 */ 2140 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000; 2141 2142 /** 2143 * Flag whether the accessibility state of the subtree rooted at this view changed. 2144 */ 2145 static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000; 2146 2147 /** 2148 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2149 * is used to check whether later changes to the view's transform should invalidate the 2150 * view to force the quickReject test to run again. 2151 */ 2152 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2153 2154 /** 2155 * Flag indicating that start/end padding has been resolved into left/right padding 2156 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2157 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2158 * during measurement. In some special cases this is required such as when an adapter-based 2159 * view measures prospective children without attaching them to a window. 2160 */ 2161 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2162 2163 /** 2164 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2165 */ 2166 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2167 2168 /** 2169 * Group of bits indicating that RTL properties resolution is done. 2170 */ 2171 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2172 PFLAG2_TEXT_DIRECTION_RESOLVED | 2173 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2174 PFLAG2_PADDING_RESOLVED | 2175 PFLAG2_DRAWABLE_RESOLVED; 2176 2177 // There are a couple of flags left in mPrivateFlags2 2178 2179 /* End of masks for mPrivateFlags2 */ 2180 2181 /* Masks for mPrivateFlags3 */ 2182 2183 /** 2184 * Flag indicating that view has a transform animation set on it. This is used to track whether 2185 * an animation is cleared between successive frames, in order to tell the associated 2186 * DisplayList to clear its animation matrix. 2187 */ 2188 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2189 2190 /** 2191 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2192 * animation is cleared between successive frames, in order to tell the associated 2193 * DisplayList to restore its alpha value. 2194 */ 2195 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2196 2197 /** 2198 * Flag indicating that the view has been through at least one layout since it 2199 * was last attached to a window. 2200 */ 2201 static final int PFLAG3_IS_LAID_OUT = 0x4; 2202 2203 /** 2204 * Flag indicating that a call to measure() was skipped and should be done 2205 * instead when layout() is invoked. 2206 */ 2207 static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8; 2208 2209 2210 /* End of masks for mPrivateFlags3 */ 2211 2212 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2213 2214 /** 2215 * Always allow a user to over-scroll this view, provided it is a 2216 * view that can scroll. 2217 * 2218 * @see #getOverScrollMode() 2219 * @see #setOverScrollMode(int) 2220 */ 2221 public static final int OVER_SCROLL_ALWAYS = 0; 2222 2223 /** 2224 * Allow a user to over-scroll this view only if the content is large 2225 * enough to meaningfully scroll, provided it is a view that can scroll. 2226 * 2227 * @see #getOverScrollMode() 2228 * @see #setOverScrollMode(int) 2229 */ 2230 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2231 2232 /** 2233 * Never allow a user to over-scroll this view. 2234 * 2235 * @see #getOverScrollMode() 2236 * @see #setOverScrollMode(int) 2237 */ 2238 public static final int OVER_SCROLL_NEVER = 2; 2239 2240 /** 2241 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2242 * requested the system UI (status bar) to be visible (the default). 2243 * 2244 * @see #setSystemUiVisibility(int) 2245 */ 2246 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2247 2248 /** 2249 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2250 * system UI to enter an unobtrusive "low profile" mode. 2251 * 2252 * <p>This is for use in games, book readers, video players, or any other 2253 * "immersive" application where the usual system chrome is deemed too distracting. 2254 * 2255 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2256 * 2257 * @see #setSystemUiVisibility(int) 2258 */ 2259 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2260 2261 /** 2262 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2263 * system navigation be temporarily hidden. 2264 * 2265 * <p>This is an even less obtrusive state than that called for by 2266 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2267 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2268 * those to disappear. This is useful (in conjunction with the 2269 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2270 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2271 * window flags) for displaying content using every last pixel on the display. 2272 * 2273 * <p>There is a limitation: because navigation controls are so important, the least user 2274 * interaction will cause them to reappear immediately. When this happens, both 2275 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2276 * so that both elements reappear at the same time. 2277 * 2278 * @see #setSystemUiVisibility(int) 2279 */ 2280 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2281 2282 /** 2283 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2284 * into the normal fullscreen mode so that its content can take over the screen 2285 * while still allowing the user to interact with the application. 2286 * 2287 * <p>This has the same visual effect as 2288 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2289 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2290 * meaning that non-critical screen decorations (such as the status bar) will be 2291 * hidden while the user is in the View's window, focusing the experience on 2292 * that content. Unlike the window flag, if you are using ActionBar in 2293 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2294 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2295 * hide the action bar. 2296 * 2297 * <p>This approach to going fullscreen is best used over the window flag when 2298 * it is a transient state -- that is, the application does this at certain 2299 * points in its user interaction where it wants to allow the user to focus 2300 * on content, but not as a continuous state. For situations where the application 2301 * would like to simply stay full screen the entire time (such as a game that 2302 * wants to take over the screen), the 2303 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2304 * is usually a better approach. The state set here will be removed by the system 2305 * in various situations (such as the user moving to another application) like 2306 * the other system UI states. 2307 * 2308 * <p>When using this flag, the application should provide some easy facility 2309 * for the user to go out of it. A common example would be in an e-book 2310 * reader, where tapping on the screen brings back whatever screen and UI 2311 * decorations that had been hidden while the user was immersed in reading 2312 * the book. 2313 * 2314 * @see #setSystemUiVisibility(int) 2315 */ 2316 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2317 2318 /** 2319 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2320 * flags, we would like a stable view of the content insets given to 2321 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2322 * will always represent the worst case that the application can expect 2323 * as a continuous state. In the stock Android UI this is the space for 2324 * the system bar, nav bar, and status bar, but not more transient elements 2325 * such as an input method. 2326 * 2327 * The stable layout your UI sees is based on the system UI modes you can 2328 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2329 * then you will get a stable layout for changes of the 2330 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2331 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2332 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2333 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2334 * with a stable layout. (Note that you should avoid using 2335 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2336 * 2337 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2338 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2339 * then a hidden status bar will be considered a "stable" state for purposes 2340 * here. This allows your UI to continually hide the status bar, while still 2341 * using the system UI flags to hide the action bar while still retaining 2342 * a stable layout. Note that changing the window fullscreen flag will never 2343 * provide a stable layout for a clean transition. 2344 * 2345 * <p>If you are using ActionBar in 2346 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2347 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2348 * insets it adds to those given to the application. 2349 */ 2350 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2351 2352 /** 2353 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2354 * to be layed out as if it has requested 2355 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2356 * allows it to avoid artifacts when switching in and out of that mode, at 2357 * the expense that some of its user interface may be covered by screen 2358 * decorations when they are shown. You can perform layout of your inner 2359 * UI elements to account for the navigation system UI through the 2360 * {@link #fitSystemWindows(Rect)} method. 2361 */ 2362 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2363 2364 /** 2365 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2366 * to be layed out as if it has requested 2367 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2368 * allows it to avoid artifacts when switching in and out of that mode, at 2369 * the expense that some of its user interface may be covered by screen 2370 * decorations when they are shown. You can perform layout of your inner 2371 * UI elements to account for non-fullscreen system UI through the 2372 * {@link #fitSystemWindows(Rect)} method. 2373 */ 2374 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2375 2376 /** 2377 * Flag for {@link #setSystemUiVisibility(int)}: View would like to receive touch events 2378 * when hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the 2379 * navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} instead of having the system 2380 * clear these flags upon interaction. The system may compensate by temporarily overlaying 2381 * transparent system ui while also delivering the event. 2382 */ 2383 public static final int SYSTEM_UI_FLAG_ALLOW_OVERLAY = 0x00000800; 2384 2385 /** 2386 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2387 */ 2388 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2389 2390 /** 2391 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2392 */ 2393 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2394 2395 /** 2396 * @hide 2397 * 2398 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2399 * out of the public fields to keep the undefined bits out of the developer's way. 2400 * 2401 * Flag to make the status bar not expandable. Unless you also 2402 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2403 */ 2404 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2405 2406 /** 2407 * @hide 2408 * 2409 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2410 * out of the public fields to keep the undefined bits out of the developer's way. 2411 * 2412 * Flag to hide notification icons and scrolling ticker text. 2413 */ 2414 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2415 2416 /** 2417 * @hide 2418 * 2419 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2420 * out of the public fields to keep the undefined bits out of the developer's way. 2421 * 2422 * Flag to disable incoming notification alerts. This will not block 2423 * icons, but it will block sound, vibrating and other visual or aural notifications. 2424 */ 2425 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2426 2427 /** 2428 * @hide 2429 * 2430 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2431 * out of the public fields to keep the undefined bits out of the developer's way. 2432 * 2433 * Flag to hide only the scrolling ticker. Note that 2434 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2435 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2436 */ 2437 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2438 2439 /** 2440 * @hide 2441 * 2442 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2443 * out of the public fields to keep the undefined bits out of the developer's way. 2444 * 2445 * Flag to hide the center system info area. 2446 */ 2447 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2448 2449 /** 2450 * @hide 2451 * 2452 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2453 * out of the public fields to keep the undefined bits out of the developer's way. 2454 * 2455 * Flag to hide only the home button. Don't use this 2456 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2457 */ 2458 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2459 2460 /** 2461 * @hide 2462 * 2463 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2464 * out of the public fields to keep the undefined bits out of the developer's way. 2465 * 2466 * Flag to hide only the back button. Don't use this 2467 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2468 */ 2469 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2470 2471 /** 2472 * @hide 2473 * 2474 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2475 * out of the public fields to keep the undefined bits out of the developer's way. 2476 * 2477 * Flag to hide only the clock. You might use this if your activity has 2478 * its own clock making the status bar's clock redundant. 2479 */ 2480 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2481 2482 /** 2483 * @hide 2484 * 2485 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2486 * out of the public fields to keep the undefined bits out of the developer's way. 2487 * 2488 * Flag to hide only the recent apps button. Don't use this 2489 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2490 */ 2491 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2492 2493 /** 2494 * @hide 2495 * 2496 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2497 * out of the public fields to keep the undefined bits out of the developer's way. 2498 * 2499 * Flag to disable the global search gesture. Don't use this 2500 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2501 */ 2502 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2503 2504 /** 2505 * @hide 2506 * 2507 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2508 * out of the public fields to keep the undefined bits out of the developer's way. 2509 * 2510 * Flag to specify that the status bar should temporarily overlay underlying content 2511 * that is otherwise assuming the status bar is hidden. The status bar may 2512 * have some degree of transparency while in this temporary overlay mode. 2513 */ 2514 public static final int STATUS_BAR_OVERLAY = 0x04000000; 2515 2516 /** 2517 * @hide 2518 * 2519 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2520 * out of the public fields to keep the undefined bits out of the developer's way. 2521 * 2522 * Flag to specify that the navigation bar should temporarily overlay underlying content 2523 * that is otherwise assuming the navigation bar is hidden. The navigation bar mayu 2524 * have some degree of transparency while in this temporary overlay mode. 2525 */ 2526 public static final int NAVIGATION_BAR_OVERLAY = 0x08000000; 2527 2528 /** 2529 * @hide 2530 */ 2531 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2532 2533 /** 2534 * These are the system UI flags that can be cleared by events outside 2535 * of an application. Currently this is just the ability to tap on the 2536 * screen while hiding the navigation bar to have it return. 2537 * @hide 2538 */ 2539 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2540 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2541 | SYSTEM_UI_FLAG_FULLSCREEN; 2542 2543 /** 2544 * Flags that can impact the layout in relation to system UI. 2545 */ 2546 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2547 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2548 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2549 2550 /** 2551 * Find views that render the specified text. 2552 * 2553 * @see #findViewsWithText(ArrayList, CharSequence, int) 2554 */ 2555 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2556 2557 /** 2558 * Find find views that contain the specified content description. 2559 * 2560 * @see #findViewsWithText(ArrayList, CharSequence, int) 2561 */ 2562 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2563 2564 /** 2565 * Find views that contain {@link AccessibilityNodeProvider}. Such 2566 * a View is a root of virtual view hierarchy and may contain the searched 2567 * text. If this flag is set Views with providers are automatically 2568 * added and it is a responsibility of the client to call the APIs of 2569 * the provider to determine whether the virtual tree rooted at this View 2570 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2571 * represeting the virtual views with this text. 2572 * 2573 * @see #findViewsWithText(ArrayList, CharSequence, int) 2574 * 2575 * @hide 2576 */ 2577 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2578 2579 /** 2580 * The undefined cursor position. 2581 * 2582 * @hide 2583 */ 2584 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2585 2586 /** 2587 * Indicates that the screen has changed state and is now off. 2588 * 2589 * @see #onScreenStateChanged(int) 2590 */ 2591 public static final int SCREEN_STATE_OFF = 0x0; 2592 2593 /** 2594 * Indicates that the screen has changed state and is now on. 2595 * 2596 * @see #onScreenStateChanged(int) 2597 */ 2598 public static final int SCREEN_STATE_ON = 0x1; 2599 2600 /** 2601 * Controls the over-scroll mode for this view. 2602 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2603 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2604 * and {@link #OVER_SCROLL_NEVER}. 2605 */ 2606 private int mOverScrollMode; 2607 2608 /** 2609 * The parent this view is attached to. 2610 * {@hide} 2611 * 2612 * @see #getParent() 2613 */ 2614 protected ViewParent mParent; 2615 2616 /** 2617 * {@hide} 2618 */ 2619 AttachInfo mAttachInfo; 2620 2621 /** 2622 * {@hide} 2623 */ 2624 @ViewDebug.ExportedProperty(flagMapping = { 2625 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2626 name = "FORCE_LAYOUT"), 2627 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2628 name = "LAYOUT_REQUIRED"), 2629 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2630 name = "DRAWING_CACHE_INVALID", outputIf = false), 2631 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2632 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2633 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2634 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2635 }) 2636 int mPrivateFlags; 2637 int mPrivateFlags2; 2638 int mPrivateFlags3; 2639 2640 /** 2641 * This view's request for the visibility of the status bar. 2642 * @hide 2643 */ 2644 @ViewDebug.ExportedProperty(flagMapping = { 2645 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2646 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2647 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2648 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2649 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2650 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2651 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2652 equals = SYSTEM_UI_FLAG_VISIBLE, 2653 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2654 }) 2655 int mSystemUiVisibility; 2656 2657 /** 2658 * Reference count for transient state. 2659 * @see #setHasTransientState(boolean) 2660 */ 2661 int mTransientStateCount = 0; 2662 2663 /** 2664 * Count of how many windows this view has been attached to. 2665 */ 2666 int mWindowAttachCount; 2667 2668 /** 2669 * The layout parameters associated with this view and used by the parent 2670 * {@link android.view.ViewGroup} to determine how this view should be 2671 * laid out. 2672 * {@hide} 2673 */ 2674 protected ViewGroup.LayoutParams mLayoutParams; 2675 2676 /** 2677 * The view flags hold various views states. 2678 * {@hide} 2679 */ 2680 @ViewDebug.ExportedProperty 2681 int mViewFlags; 2682 2683 static class TransformationInfo { 2684 /** 2685 * The transform matrix for the View. This transform is calculated internally 2686 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2687 * is used by default. Do *not* use this variable directly; instead call 2688 * getMatrix(), which will automatically recalculate the matrix if necessary 2689 * to get the correct matrix based on the latest rotation and scale properties. 2690 */ 2691 private final Matrix mMatrix = new Matrix(); 2692 2693 /** 2694 * The transform matrix for the View. This transform is calculated internally 2695 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2696 * is used by default. Do *not* use this variable directly; instead call 2697 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2698 * to get the correct matrix based on the latest rotation and scale properties. 2699 */ 2700 private Matrix mInverseMatrix; 2701 2702 /** 2703 * An internal variable that tracks whether we need to recalculate the 2704 * transform matrix, based on whether the rotation or scaleX/Y properties 2705 * have changed since the matrix was last calculated. 2706 */ 2707 boolean mMatrixDirty = false; 2708 2709 /** 2710 * An internal variable that tracks whether we need to recalculate the 2711 * transform matrix, based on whether the rotation or scaleX/Y properties 2712 * have changed since the matrix was last calculated. 2713 */ 2714 private boolean mInverseMatrixDirty = true; 2715 2716 /** 2717 * A variable that tracks whether we need to recalculate the 2718 * transform matrix, based on whether the rotation or scaleX/Y properties 2719 * have changed since the matrix was last calculated. This variable 2720 * is only valid after a call to updateMatrix() or to a function that 2721 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2722 */ 2723 private boolean mMatrixIsIdentity = true; 2724 2725 /** 2726 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2727 */ 2728 private Camera mCamera = null; 2729 2730 /** 2731 * This matrix is used when computing the matrix for 3D rotations. 2732 */ 2733 private Matrix matrix3D = null; 2734 2735 /** 2736 * These prev values are used to recalculate a centered pivot point when necessary. The 2737 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2738 * set), so thes values are only used then as well. 2739 */ 2740 private int mPrevWidth = -1; 2741 private int mPrevHeight = -1; 2742 2743 /** 2744 * The degrees rotation around the vertical axis through the pivot point. 2745 */ 2746 @ViewDebug.ExportedProperty 2747 float mRotationY = 0f; 2748 2749 /** 2750 * The degrees rotation around the horizontal axis through the pivot point. 2751 */ 2752 @ViewDebug.ExportedProperty 2753 float mRotationX = 0f; 2754 2755 /** 2756 * The degrees rotation around the pivot point. 2757 */ 2758 @ViewDebug.ExportedProperty 2759 float mRotation = 0f; 2760 2761 /** 2762 * The amount of translation of the object away from its left property (post-layout). 2763 */ 2764 @ViewDebug.ExportedProperty 2765 float mTranslationX = 0f; 2766 2767 /** 2768 * The amount of translation of the object away from its top property (post-layout). 2769 */ 2770 @ViewDebug.ExportedProperty 2771 float mTranslationY = 0f; 2772 2773 /** 2774 * The amount of scale in the x direction around the pivot point. A 2775 * value of 1 means no scaling is applied. 2776 */ 2777 @ViewDebug.ExportedProperty 2778 float mScaleX = 1f; 2779 2780 /** 2781 * The amount of scale in the y direction around the pivot point. A 2782 * value of 1 means no scaling is applied. 2783 */ 2784 @ViewDebug.ExportedProperty 2785 float mScaleY = 1f; 2786 2787 /** 2788 * The x location of the point around which the view is rotated and scaled. 2789 */ 2790 @ViewDebug.ExportedProperty 2791 float mPivotX = 0f; 2792 2793 /** 2794 * The y location of the point around which the view is rotated and scaled. 2795 */ 2796 @ViewDebug.ExportedProperty 2797 float mPivotY = 0f; 2798 2799 /** 2800 * The opacity of the View. This is a value from 0 to 1, where 0 means 2801 * completely transparent and 1 means completely opaque. 2802 */ 2803 @ViewDebug.ExportedProperty 2804 float mAlpha = 1f; 2805 } 2806 2807 TransformationInfo mTransformationInfo; 2808 2809 /** 2810 * Current clip bounds. to which all drawing of this view are constrained. 2811 */ 2812 private Rect mClipBounds = null; 2813 2814 private boolean mLastIsOpaque; 2815 2816 /** 2817 * Convenience value to check for float values that are close enough to zero to be considered 2818 * zero. 2819 */ 2820 private static final float NONZERO_EPSILON = .001f; 2821 2822 /** 2823 * The distance in pixels from the left edge of this view's parent 2824 * to the left edge of this view. 2825 * {@hide} 2826 */ 2827 @ViewDebug.ExportedProperty(category = "layout") 2828 protected int mLeft; 2829 /** 2830 * The distance in pixels from the left edge of this view's parent 2831 * to the right edge of this view. 2832 * {@hide} 2833 */ 2834 @ViewDebug.ExportedProperty(category = "layout") 2835 protected int mRight; 2836 /** 2837 * The distance in pixels from the top edge of this view's parent 2838 * to the top edge of this view. 2839 * {@hide} 2840 */ 2841 @ViewDebug.ExportedProperty(category = "layout") 2842 protected int mTop; 2843 /** 2844 * The distance in pixels from the top edge of this view's parent 2845 * to the bottom edge of this view. 2846 * {@hide} 2847 */ 2848 @ViewDebug.ExportedProperty(category = "layout") 2849 protected int mBottom; 2850 2851 /** 2852 * The offset, in pixels, by which the content of this view is scrolled 2853 * horizontally. 2854 * {@hide} 2855 */ 2856 @ViewDebug.ExportedProperty(category = "scrolling") 2857 protected int mScrollX; 2858 /** 2859 * The offset, in pixels, by which the content of this view is scrolled 2860 * vertically. 2861 * {@hide} 2862 */ 2863 @ViewDebug.ExportedProperty(category = "scrolling") 2864 protected int mScrollY; 2865 2866 /** 2867 * The left padding in pixels, that is the distance in pixels between the 2868 * left edge of this view and the left edge of its content. 2869 * {@hide} 2870 */ 2871 @ViewDebug.ExportedProperty(category = "padding") 2872 protected int mPaddingLeft = 0; 2873 /** 2874 * The right padding in pixels, that is the distance in pixels between the 2875 * right edge of this view and the right edge of its content. 2876 * {@hide} 2877 */ 2878 @ViewDebug.ExportedProperty(category = "padding") 2879 protected int mPaddingRight = 0; 2880 /** 2881 * The top padding in pixels, that is the distance in pixels between the 2882 * top edge of this view and the top edge of its content. 2883 * {@hide} 2884 */ 2885 @ViewDebug.ExportedProperty(category = "padding") 2886 protected int mPaddingTop; 2887 /** 2888 * The bottom padding in pixels, that is the distance in pixels between the 2889 * bottom edge of this view and the bottom edge of its content. 2890 * {@hide} 2891 */ 2892 @ViewDebug.ExportedProperty(category = "padding") 2893 protected int mPaddingBottom; 2894 2895 /** 2896 * The layout insets in pixels, that is the distance in pixels between the 2897 * visible edges of this view its bounds. 2898 */ 2899 private Insets mLayoutInsets; 2900 2901 /** 2902 * Briefly describes the view and is primarily used for accessibility support. 2903 */ 2904 private CharSequence mContentDescription; 2905 2906 /** 2907 * Specifies the id of a view for which this view serves as a label for 2908 * accessibility purposes. 2909 */ 2910 private int mLabelForId = View.NO_ID; 2911 2912 /** 2913 * Predicate for matching labeled view id with its label for 2914 * accessibility purposes. 2915 */ 2916 private MatchLabelForPredicate mMatchLabelForPredicate; 2917 2918 /** 2919 * Predicate for matching a view by its id. 2920 */ 2921 private MatchIdPredicate mMatchIdPredicate; 2922 2923 /** 2924 * Cache the paddingRight set by the user to append to the scrollbar's size. 2925 * 2926 * @hide 2927 */ 2928 @ViewDebug.ExportedProperty(category = "padding") 2929 protected int mUserPaddingRight; 2930 2931 /** 2932 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2933 * 2934 * @hide 2935 */ 2936 @ViewDebug.ExportedProperty(category = "padding") 2937 protected int mUserPaddingBottom; 2938 2939 /** 2940 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2941 * 2942 * @hide 2943 */ 2944 @ViewDebug.ExportedProperty(category = "padding") 2945 protected int mUserPaddingLeft; 2946 2947 /** 2948 * Cache the paddingStart set by the user to append to the scrollbar's size. 2949 * 2950 */ 2951 @ViewDebug.ExportedProperty(category = "padding") 2952 int mUserPaddingStart; 2953 2954 /** 2955 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2956 * 2957 */ 2958 @ViewDebug.ExportedProperty(category = "padding") 2959 int mUserPaddingEnd; 2960 2961 /** 2962 * Cache initial left padding. 2963 * 2964 * @hide 2965 */ 2966 int mUserPaddingLeftInitial; 2967 2968 /** 2969 * Cache initial right padding. 2970 * 2971 * @hide 2972 */ 2973 int mUserPaddingRightInitial; 2974 2975 /** 2976 * Default undefined padding 2977 */ 2978 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 2979 2980 /** 2981 * @hide 2982 */ 2983 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2984 /** 2985 * @hide 2986 */ 2987 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2988 2989 private LongSparseLongArray mMeasureCache; 2990 2991 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 2992 private Drawable mBackground; 2993 2994 private int mBackgroundResource; 2995 private boolean mBackgroundSizeChanged; 2996 2997 static class ListenerInfo { 2998 /** 2999 * Listener used to dispatch focus change events. 3000 * This field should be made private, so it is hidden from the SDK. 3001 * {@hide} 3002 */ 3003 protected OnFocusChangeListener mOnFocusChangeListener; 3004 3005 /** 3006 * Listeners for layout change events. 3007 */ 3008 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 3009 3010 /** 3011 * Listeners for attach events. 3012 */ 3013 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 3014 3015 /** 3016 * Listener used to dispatch click events. 3017 * This field should be made private, so it is hidden from the SDK. 3018 * {@hide} 3019 */ 3020 public OnClickListener mOnClickListener; 3021 3022 /** 3023 * Listener used to dispatch long click events. 3024 * This field should be made private, so it is hidden from the SDK. 3025 * {@hide} 3026 */ 3027 protected OnLongClickListener mOnLongClickListener; 3028 3029 /** 3030 * Listener used to build the context menu. 3031 * This field should be made private, so it is hidden from the SDK. 3032 * {@hide} 3033 */ 3034 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 3035 3036 private OnKeyListener mOnKeyListener; 3037 3038 private OnTouchListener mOnTouchListener; 3039 3040 private OnHoverListener mOnHoverListener; 3041 3042 private OnGenericMotionListener mOnGenericMotionListener; 3043 3044 private OnDragListener mOnDragListener; 3045 3046 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 3047 } 3048 3049 ListenerInfo mListenerInfo; 3050 3051 /** 3052 * The application environment this view lives in. 3053 * This field should be made private, so it is hidden from the SDK. 3054 * {@hide} 3055 */ 3056 protected Context mContext; 3057 3058 private final Resources mResources; 3059 3060 private ScrollabilityCache mScrollCache; 3061 3062 private int[] mDrawableState = null; 3063 3064 /** 3065 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3066 * the user may specify which view to go to next. 3067 */ 3068 private int mNextFocusLeftId = View.NO_ID; 3069 3070 /** 3071 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3072 * the user may specify which view to go to next. 3073 */ 3074 private int mNextFocusRightId = View.NO_ID; 3075 3076 /** 3077 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3078 * the user may specify which view to go to next. 3079 */ 3080 private int mNextFocusUpId = View.NO_ID; 3081 3082 /** 3083 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3084 * the user may specify which view to go to next. 3085 */ 3086 private int mNextFocusDownId = View.NO_ID; 3087 3088 /** 3089 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3090 * the user may specify which view to go to next. 3091 */ 3092 int mNextFocusForwardId = View.NO_ID; 3093 3094 private CheckForLongPress mPendingCheckForLongPress; 3095 private CheckForTap mPendingCheckForTap = null; 3096 private PerformClick mPerformClick; 3097 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3098 3099 private UnsetPressedState mUnsetPressedState; 3100 3101 /** 3102 * Whether the long press's action has been invoked. The tap's action is invoked on the 3103 * up event while a long press is invoked as soon as the long press duration is reached, so 3104 * a long press could be performed before the tap is checked, in which case the tap's action 3105 * should not be invoked. 3106 */ 3107 private boolean mHasPerformedLongPress; 3108 3109 /** 3110 * The minimum height of the view. We'll try our best to have the height 3111 * of this view to at least this amount. 3112 */ 3113 @ViewDebug.ExportedProperty(category = "measurement") 3114 private int mMinHeight; 3115 3116 /** 3117 * The minimum width of the view. We'll try our best to have the width 3118 * of this view to at least this amount. 3119 */ 3120 @ViewDebug.ExportedProperty(category = "measurement") 3121 private int mMinWidth; 3122 3123 /** 3124 * The delegate to handle touch events that are physically in this view 3125 * but should be handled by another view. 3126 */ 3127 private TouchDelegate mTouchDelegate = null; 3128 3129 /** 3130 * Solid color to use as a background when creating the drawing cache. Enables 3131 * the cache to use 16 bit bitmaps instead of 32 bit. 3132 */ 3133 private int mDrawingCacheBackgroundColor = 0; 3134 3135 /** 3136 * Special tree observer used when mAttachInfo is null. 3137 */ 3138 private ViewTreeObserver mFloatingTreeObserver; 3139 3140 /** 3141 * Cache the touch slop from the context that created the view. 3142 */ 3143 private int mTouchSlop; 3144 3145 /** 3146 * Object that handles automatic animation of view properties. 3147 */ 3148 private ViewPropertyAnimator mAnimator = null; 3149 3150 /** 3151 * Flag indicating that a drag can cross window boundaries. When 3152 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3153 * with this flag set, all visible applications will be able to participate 3154 * in the drag operation and receive the dragged content. 3155 * 3156 * @hide 3157 */ 3158 public static final int DRAG_FLAG_GLOBAL = 1; 3159 3160 /** 3161 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3162 */ 3163 private float mVerticalScrollFactor; 3164 3165 /** 3166 * Position of the vertical scroll bar. 3167 */ 3168 private int mVerticalScrollbarPosition; 3169 3170 /** 3171 * Position the scroll bar at the default position as determined by the system. 3172 */ 3173 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3174 3175 /** 3176 * Position the scroll bar along the left edge. 3177 */ 3178 public static final int SCROLLBAR_POSITION_LEFT = 1; 3179 3180 /** 3181 * Position the scroll bar along the right edge. 3182 */ 3183 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3184 3185 /** 3186 * Indicates that the view does not have a layer. 3187 * 3188 * @see #getLayerType() 3189 * @see #setLayerType(int, android.graphics.Paint) 3190 * @see #LAYER_TYPE_SOFTWARE 3191 * @see #LAYER_TYPE_HARDWARE 3192 */ 3193 public static final int LAYER_TYPE_NONE = 0; 3194 3195 /** 3196 * <p>Indicates that the view has a software layer. A software layer is backed 3197 * by a bitmap and causes the view to be rendered using Android's software 3198 * rendering pipeline, even if hardware acceleration is enabled.</p> 3199 * 3200 * <p>Software layers have various usages:</p> 3201 * <p>When the application is not using hardware acceleration, a software layer 3202 * is useful to apply a specific color filter and/or blending mode and/or 3203 * translucency to a view and all its children.</p> 3204 * <p>When the application is using hardware acceleration, a software layer 3205 * is useful to render drawing primitives not supported by the hardware 3206 * accelerated pipeline. It can also be used to cache a complex view tree 3207 * into a texture and reduce the complexity of drawing operations. For instance, 3208 * when animating a complex view tree with a translation, a software layer can 3209 * be used to render the view tree only once.</p> 3210 * <p>Software layers should be avoided when the affected view tree updates 3211 * often. Every update will require to re-render the software layer, which can 3212 * potentially be slow (particularly when hardware acceleration is turned on 3213 * since the layer will have to be uploaded into a hardware texture after every 3214 * update.)</p> 3215 * 3216 * @see #getLayerType() 3217 * @see #setLayerType(int, android.graphics.Paint) 3218 * @see #LAYER_TYPE_NONE 3219 * @see #LAYER_TYPE_HARDWARE 3220 */ 3221 public static final int LAYER_TYPE_SOFTWARE = 1; 3222 3223 /** 3224 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3225 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3226 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3227 * rendering pipeline, but only if hardware acceleration is turned on for the 3228 * view hierarchy. When hardware acceleration is turned off, hardware layers 3229 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3230 * 3231 * <p>A hardware layer is useful to apply a specific color filter and/or 3232 * blending mode and/or translucency to a view and all its children.</p> 3233 * <p>A hardware layer can be used to cache a complex view tree into a 3234 * texture and reduce the complexity of drawing operations. For instance, 3235 * when animating a complex view tree with a translation, a hardware layer can 3236 * be used to render the view tree only once.</p> 3237 * <p>A hardware layer can also be used to increase the rendering quality when 3238 * rotation transformations are applied on a view. It can also be used to 3239 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3240 * 3241 * @see #getLayerType() 3242 * @see #setLayerType(int, android.graphics.Paint) 3243 * @see #LAYER_TYPE_NONE 3244 * @see #LAYER_TYPE_SOFTWARE 3245 */ 3246 public static final int LAYER_TYPE_HARDWARE = 2; 3247 3248 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3249 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3250 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3251 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3252 }) 3253 int mLayerType = LAYER_TYPE_NONE; 3254 Paint mLayerPaint; 3255 Rect mLocalDirtyRect; 3256 private HardwareLayer mHardwareLayer; 3257 3258 /** 3259 * Set to true when drawing cache is enabled and cannot be created. 3260 * 3261 * @hide 3262 */ 3263 public boolean mCachingFailed; 3264 private Bitmap mDrawingCache; 3265 private Bitmap mUnscaledDrawingCache; 3266 3267 DisplayList mDisplayList; 3268 3269 /** 3270 * Set to true when the view is sending hover accessibility events because it 3271 * is the innermost hovered view. 3272 */ 3273 private boolean mSendingHoverAccessibilityEvents; 3274 3275 /** 3276 * Delegate for injecting accessibility functionality. 3277 */ 3278 AccessibilityDelegate mAccessibilityDelegate; 3279 3280 /** 3281 * The view's overlay layer. Developers get a reference to the overlay via getOverlay() 3282 * and add/remove objects to/from the overlay directly through the Overlay methods. 3283 */ 3284 ViewOverlay mOverlay; 3285 3286 /** 3287 * Consistency verifier for debugging purposes. 3288 * @hide 3289 */ 3290 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3291 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3292 new InputEventConsistencyVerifier(this, 0) : null; 3293 3294 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3295 3296 /** 3297 * Simple constructor to use when creating a view from code. 3298 * 3299 * @param context The Context the view is running in, through which it can 3300 * access the current theme, resources, etc. 3301 */ 3302 public View(Context context) { 3303 mContext = context; 3304 mResources = context != null ? context.getResources() : null; 3305 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3306 // Set some flags defaults 3307 mPrivateFlags2 = 3308 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3309 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3310 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3311 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3312 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3313 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3314 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3315 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3316 mUserPaddingStart = UNDEFINED_PADDING; 3317 mUserPaddingEnd = UNDEFINED_PADDING; 3318 3319 if (!sUseBrokenMakeMeasureSpec && context != null && 3320 context.getApplicationInfo().targetSdkVersion <= JELLY_BEAN_MR1) { 3321 // Older apps may need this compatibility hack for measurement. 3322 sUseBrokenMakeMeasureSpec = true; 3323 } 3324 } 3325 3326 /** 3327 * Constructor that is called when inflating a view from XML. This is called 3328 * when a view is being constructed from an XML file, supplying attributes 3329 * that were specified in the XML file. This version uses a default style of 3330 * 0, so the only attribute values applied are those in the Context's Theme 3331 * and the given AttributeSet. 3332 * 3333 * <p> 3334 * The method onFinishInflate() will be called after all children have been 3335 * added. 3336 * 3337 * @param context The Context the view is running in, through which it can 3338 * access the current theme, resources, etc. 3339 * @param attrs The attributes of the XML tag that is inflating the view. 3340 * @see #View(Context, AttributeSet, int) 3341 */ 3342 public View(Context context, AttributeSet attrs) { 3343 this(context, attrs, 0); 3344 } 3345 3346 /** 3347 * Perform inflation from XML and apply a class-specific base style. This 3348 * constructor of View allows subclasses to use their own base style when 3349 * they are inflating. For example, a Button class's constructor would call 3350 * this version of the super class constructor and supply 3351 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3352 * the theme's button style to modify all of the base view attributes (in 3353 * particular its background) as well as the Button class's attributes. 3354 * 3355 * @param context The Context the view is running in, through which it can 3356 * access the current theme, resources, etc. 3357 * @param attrs The attributes of the XML tag that is inflating the view. 3358 * @param defStyle The default style to apply to this view. If 0, no style 3359 * will be applied (beyond what is included in the theme). This may 3360 * either be an attribute resource, whose value will be retrieved 3361 * from the current theme, or an explicit style resource. 3362 * @see #View(Context, AttributeSet) 3363 */ 3364 public View(Context context, AttributeSet attrs, int defStyle) { 3365 this(context); 3366 3367 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3368 defStyle, 0); 3369 3370 Drawable background = null; 3371 3372 int leftPadding = -1; 3373 int topPadding = -1; 3374 int rightPadding = -1; 3375 int bottomPadding = -1; 3376 int startPadding = UNDEFINED_PADDING; 3377 int endPadding = UNDEFINED_PADDING; 3378 3379 int padding = -1; 3380 3381 int viewFlagValues = 0; 3382 int viewFlagMasks = 0; 3383 3384 boolean setScrollContainer = false; 3385 3386 int x = 0; 3387 int y = 0; 3388 3389 float tx = 0; 3390 float ty = 0; 3391 float rotation = 0; 3392 float rotationX = 0; 3393 float rotationY = 0; 3394 float sx = 1f; 3395 float sy = 1f; 3396 boolean transformSet = false; 3397 3398 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3399 int overScrollMode = mOverScrollMode; 3400 boolean initializeScrollbars = false; 3401 3402 boolean leftPaddingDefined = false; 3403 boolean rightPaddingDefined = false; 3404 boolean startPaddingDefined = false; 3405 boolean endPaddingDefined = false; 3406 3407 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3408 3409 final int N = a.getIndexCount(); 3410 for (int i = 0; i < N; i++) { 3411 int attr = a.getIndex(i); 3412 switch (attr) { 3413 case com.android.internal.R.styleable.View_background: 3414 background = a.getDrawable(attr); 3415 break; 3416 case com.android.internal.R.styleable.View_padding: 3417 padding = a.getDimensionPixelSize(attr, -1); 3418 mUserPaddingLeftInitial = padding; 3419 mUserPaddingRightInitial = padding; 3420 leftPaddingDefined = true; 3421 rightPaddingDefined = true; 3422 break; 3423 case com.android.internal.R.styleable.View_paddingLeft: 3424 leftPadding = a.getDimensionPixelSize(attr, -1); 3425 mUserPaddingLeftInitial = leftPadding; 3426 leftPaddingDefined = true; 3427 break; 3428 case com.android.internal.R.styleable.View_paddingTop: 3429 topPadding = a.getDimensionPixelSize(attr, -1); 3430 break; 3431 case com.android.internal.R.styleable.View_paddingRight: 3432 rightPadding = a.getDimensionPixelSize(attr, -1); 3433 mUserPaddingRightInitial = rightPadding; 3434 rightPaddingDefined = true; 3435 break; 3436 case com.android.internal.R.styleable.View_paddingBottom: 3437 bottomPadding = a.getDimensionPixelSize(attr, -1); 3438 break; 3439 case com.android.internal.R.styleable.View_paddingStart: 3440 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3441 startPaddingDefined = (startPadding != UNDEFINED_PADDING); 3442 break; 3443 case com.android.internal.R.styleable.View_paddingEnd: 3444 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3445 endPaddingDefined = (endPadding != UNDEFINED_PADDING); 3446 break; 3447 case com.android.internal.R.styleable.View_scrollX: 3448 x = a.getDimensionPixelOffset(attr, 0); 3449 break; 3450 case com.android.internal.R.styleable.View_scrollY: 3451 y = a.getDimensionPixelOffset(attr, 0); 3452 break; 3453 case com.android.internal.R.styleable.View_alpha: 3454 setAlpha(a.getFloat(attr, 1f)); 3455 break; 3456 case com.android.internal.R.styleable.View_transformPivotX: 3457 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3458 break; 3459 case com.android.internal.R.styleable.View_transformPivotY: 3460 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3461 break; 3462 case com.android.internal.R.styleable.View_translationX: 3463 tx = a.getDimensionPixelOffset(attr, 0); 3464 transformSet = true; 3465 break; 3466 case com.android.internal.R.styleable.View_translationY: 3467 ty = a.getDimensionPixelOffset(attr, 0); 3468 transformSet = true; 3469 break; 3470 case com.android.internal.R.styleable.View_rotation: 3471 rotation = a.getFloat(attr, 0); 3472 transformSet = true; 3473 break; 3474 case com.android.internal.R.styleable.View_rotationX: 3475 rotationX = a.getFloat(attr, 0); 3476 transformSet = true; 3477 break; 3478 case com.android.internal.R.styleable.View_rotationY: 3479 rotationY = a.getFloat(attr, 0); 3480 transformSet = true; 3481 break; 3482 case com.android.internal.R.styleable.View_scaleX: 3483 sx = a.getFloat(attr, 1f); 3484 transformSet = true; 3485 break; 3486 case com.android.internal.R.styleable.View_scaleY: 3487 sy = a.getFloat(attr, 1f); 3488 transformSet = true; 3489 break; 3490 case com.android.internal.R.styleable.View_id: 3491 mID = a.getResourceId(attr, NO_ID); 3492 break; 3493 case com.android.internal.R.styleable.View_tag: 3494 mTag = a.getText(attr); 3495 break; 3496 case com.android.internal.R.styleable.View_fitsSystemWindows: 3497 if (a.getBoolean(attr, false)) { 3498 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3499 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3500 } 3501 break; 3502 case com.android.internal.R.styleable.View_focusable: 3503 if (a.getBoolean(attr, false)) { 3504 viewFlagValues |= FOCUSABLE; 3505 viewFlagMasks |= FOCUSABLE_MASK; 3506 } 3507 break; 3508 case com.android.internal.R.styleable.View_focusableInTouchMode: 3509 if (a.getBoolean(attr, false)) { 3510 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3511 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3512 } 3513 break; 3514 case com.android.internal.R.styleable.View_clickable: 3515 if (a.getBoolean(attr, false)) { 3516 viewFlagValues |= CLICKABLE; 3517 viewFlagMasks |= CLICKABLE; 3518 } 3519 break; 3520 case com.android.internal.R.styleable.View_longClickable: 3521 if (a.getBoolean(attr, false)) { 3522 viewFlagValues |= LONG_CLICKABLE; 3523 viewFlagMasks |= LONG_CLICKABLE; 3524 } 3525 break; 3526 case com.android.internal.R.styleable.View_saveEnabled: 3527 if (!a.getBoolean(attr, true)) { 3528 viewFlagValues |= SAVE_DISABLED; 3529 viewFlagMasks |= SAVE_DISABLED_MASK; 3530 } 3531 break; 3532 case com.android.internal.R.styleable.View_duplicateParentState: 3533 if (a.getBoolean(attr, false)) { 3534 viewFlagValues |= DUPLICATE_PARENT_STATE; 3535 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3536 } 3537 break; 3538 case com.android.internal.R.styleable.View_visibility: 3539 final int visibility = a.getInt(attr, 0); 3540 if (visibility != 0) { 3541 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3542 viewFlagMasks |= VISIBILITY_MASK; 3543 } 3544 break; 3545 case com.android.internal.R.styleable.View_layoutDirection: 3546 // Clear any layout direction flags (included resolved bits) already set 3547 mPrivateFlags2 &= 3548 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3549 // Set the layout direction flags depending on the value of the attribute 3550 final int layoutDirection = a.getInt(attr, -1); 3551 final int value = (layoutDirection != -1) ? 3552 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3553 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3554 break; 3555 case com.android.internal.R.styleable.View_drawingCacheQuality: 3556 final int cacheQuality = a.getInt(attr, 0); 3557 if (cacheQuality != 0) { 3558 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3559 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3560 } 3561 break; 3562 case com.android.internal.R.styleable.View_contentDescription: 3563 setContentDescription(a.getString(attr)); 3564 break; 3565 case com.android.internal.R.styleable.View_labelFor: 3566 setLabelFor(a.getResourceId(attr, NO_ID)); 3567 break; 3568 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3569 if (!a.getBoolean(attr, true)) { 3570 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3571 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3572 } 3573 break; 3574 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3575 if (!a.getBoolean(attr, true)) { 3576 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3577 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3578 } 3579 break; 3580 case R.styleable.View_scrollbars: 3581 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3582 if (scrollbars != SCROLLBARS_NONE) { 3583 viewFlagValues |= scrollbars; 3584 viewFlagMasks |= SCROLLBARS_MASK; 3585 initializeScrollbars = true; 3586 } 3587 break; 3588 //noinspection deprecation 3589 case R.styleable.View_fadingEdge: 3590 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3591 // Ignore the attribute starting with ICS 3592 break; 3593 } 3594 // With builds < ICS, fall through and apply fading edges 3595 case R.styleable.View_requiresFadingEdge: 3596 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3597 if (fadingEdge != FADING_EDGE_NONE) { 3598 viewFlagValues |= fadingEdge; 3599 viewFlagMasks |= FADING_EDGE_MASK; 3600 initializeFadingEdge(a); 3601 } 3602 break; 3603 case R.styleable.View_scrollbarStyle: 3604 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3605 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3606 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3607 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3608 } 3609 break; 3610 case R.styleable.View_isScrollContainer: 3611 setScrollContainer = true; 3612 if (a.getBoolean(attr, false)) { 3613 setScrollContainer(true); 3614 } 3615 break; 3616 case com.android.internal.R.styleable.View_keepScreenOn: 3617 if (a.getBoolean(attr, false)) { 3618 viewFlagValues |= KEEP_SCREEN_ON; 3619 viewFlagMasks |= KEEP_SCREEN_ON; 3620 } 3621 break; 3622 case R.styleable.View_filterTouchesWhenObscured: 3623 if (a.getBoolean(attr, false)) { 3624 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3625 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3626 } 3627 break; 3628 case R.styleable.View_nextFocusLeft: 3629 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3630 break; 3631 case R.styleable.View_nextFocusRight: 3632 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3633 break; 3634 case R.styleable.View_nextFocusUp: 3635 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3636 break; 3637 case R.styleable.View_nextFocusDown: 3638 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3639 break; 3640 case R.styleable.View_nextFocusForward: 3641 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3642 break; 3643 case R.styleable.View_minWidth: 3644 mMinWidth = a.getDimensionPixelSize(attr, 0); 3645 break; 3646 case R.styleable.View_minHeight: 3647 mMinHeight = a.getDimensionPixelSize(attr, 0); 3648 break; 3649 case R.styleable.View_onClick: 3650 if (context.isRestricted()) { 3651 throw new IllegalStateException("The android:onClick attribute cannot " 3652 + "be used within a restricted context"); 3653 } 3654 3655 final String handlerName = a.getString(attr); 3656 if (handlerName != null) { 3657 setOnClickListener(new OnClickListener() { 3658 private Method mHandler; 3659 3660 public void onClick(View v) { 3661 if (mHandler == null) { 3662 try { 3663 mHandler = getContext().getClass().getMethod(handlerName, 3664 View.class); 3665 } catch (NoSuchMethodException e) { 3666 int id = getId(); 3667 String idText = id == NO_ID ? "" : " with id '" 3668 + getContext().getResources().getResourceEntryName( 3669 id) + "'"; 3670 throw new IllegalStateException("Could not find a method " + 3671 handlerName + "(View) in the activity " 3672 + getContext().getClass() + " for onClick handler" 3673 + " on view " + View.this.getClass() + idText, e); 3674 } 3675 } 3676 3677 try { 3678 mHandler.invoke(getContext(), View.this); 3679 } catch (IllegalAccessException e) { 3680 throw new IllegalStateException("Could not execute non " 3681 + "public method of the activity", e); 3682 } catch (InvocationTargetException e) { 3683 throw new IllegalStateException("Could not execute " 3684 + "method of the activity", e); 3685 } 3686 } 3687 }); 3688 } 3689 break; 3690 case R.styleable.View_overScrollMode: 3691 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3692 break; 3693 case R.styleable.View_verticalScrollbarPosition: 3694 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3695 break; 3696 case R.styleable.View_layerType: 3697 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3698 break; 3699 case R.styleable.View_textDirection: 3700 // Clear any text direction flag already set 3701 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3702 // Set the text direction flags depending on the value of the attribute 3703 final int textDirection = a.getInt(attr, -1); 3704 if (textDirection != -1) { 3705 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3706 } 3707 break; 3708 case R.styleable.View_textAlignment: 3709 // Clear any text alignment flag already set 3710 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3711 // Set the text alignment flag depending on the value of the attribute 3712 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3713 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3714 break; 3715 case R.styleable.View_importantForAccessibility: 3716 setImportantForAccessibility(a.getInt(attr, 3717 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3718 break; 3719 } 3720 } 3721 3722 setOverScrollMode(overScrollMode); 3723 3724 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3725 // the resolved layout direction). Those cached values will be used later during padding 3726 // resolution. 3727 mUserPaddingStart = startPadding; 3728 mUserPaddingEnd = endPadding; 3729 3730 if (background != null) { 3731 setBackground(background); 3732 } 3733 3734 if (padding >= 0) { 3735 leftPadding = padding; 3736 topPadding = padding; 3737 rightPadding = padding; 3738 bottomPadding = padding; 3739 mUserPaddingLeftInitial = padding; 3740 mUserPaddingRightInitial = padding; 3741 } 3742 3743 if (isRtlCompatibilityMode()) { 3744 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3745 // left / right padding are used if defined (meaning here nothing to do). If they are not 3746 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3747 // start / end and resolve them as left / right (layout direction is not taken into account). 3748 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3749 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3750 // defined. 3751 if (!leftPaddingDefined && startPaddingDefined) { 3752 leftPadding = startPadding; 3753 } 3754 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3755 if (!rightPaddingDefined && endPaddingDefined) { 3756 rightPadding = endPadding; 3757 } 3758 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3759 } else { 3760 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3761 // values defined. Otherwise, left /right values are used. 3762 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3763 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3764 // defined. 3765 final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined; 3766 3767 if (leftPaddingDefined && !hasRelativePadding) { 3768 mUserPaddingLeftInitial = leftPadding; 3769 } 3770 if (rightPaddingDefined && !hasRelativePadding) { 3771 mUserPaddingRightInitial = rightPadding; 3772 } 3773 } 3774 3775 internalSetPadding( 3776 mUserPaddingLeftInitial, 3777 topPadding >= 0 ? topPadding : mPaddingTop, 3778 mUserPaddingRightInitial, 3779 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3780 3781 if (viewFlagMasks != 0) { 3782 setFlags(viewFlagValues, viewFlagMasks); 3783 } 3784 3785 if (initializeScrollbars) { 3786 initializeScrollbars(a); 3787 } 3788 3789 a.recycle(); 3790 3791 // Needs to be called after mViewFlags is set 3792 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3793 recomputePadding(); 3794 } 3795 3796 if (x != 0 || y != 0) { 3797 scrollTo(x, y); 3798 } 3799 3800 if (transformSet) { 3801 setTranslationX(tx); 3802 setTranslationY(ty); 3803 setRotation(rotation); 3804 setRotationX(rotationX); 3805 setRotationY(rotationY); 3806 setScaleX(sx); 3807 setScaleY(sy); 3808 } 3809 3810 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3811 setScrollContainer(true); 3812 } 3813 3814 computeOpaqueFlags(); 3815 } 3816 3817 /** 3818 * Non-public constructor for use in testing 3819 */ 3820 View() { 3821 mResources = null; 3822 } 3823 3824 public String toString() { 3825 StringBuilder out = new StringBuilder(128); 3826 out.append(getClass().getName()); 3827 out.append('{'); 3828 out.append(Integer.toHexString(System.identityHashCode(this))); 3829 out.append(' '); 3830 switch (mViewFlags&VISIBILITY_MASK) { 3831 case VISIBLE: out.append('V'); break; 3832 case INVISIBLE: out.append('I'); break; 3833 case GONE: out.append('G'); break; 3834 default: out.append('.'); break; 3835 } 3836 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3837 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3838 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3839 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3840 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3841 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3842 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3843 out.append(' '); 3844 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3845 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3846 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3847 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3848 out.append('p'); 3849 } else { 3850 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3851 } 3852 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3853 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3854 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3855 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3856 out.append(' '); 3857 out.append(mLeft); 3858 out.append(','); 3859 out.append(mTop); 3860 out.append('-'); 3861 out.append(mRight); 3862 out.append(','); 3863 out.append(mBottom); 3864 final int id = getId(); 3865 if (id != NO_ID) { 3866 out.append(" #"); 3867 out.append(Integer.toHexString(id)); 3868 final Resources r = mResources; 3869 if (id != 0 && r != null) { 3870 try { 3871 String pkgname; 3872 switch (id&0xff000000) { 3873 case 0x7f000000: 3874 pkgname="app"; 3875 break; 3876 case 0x01000000: 3877 pkgname="android"; 3878 break; 3879 default: 3880 pkgname = r.getResourcePackageName(id); 3881 break; 3882 } 3883 String typename = r.getResourceTypeName(id); 3884 String entryname = r.getResourceEntryName(id); 3885 out.append(" "); 3886 out.append(pkgname); 3887 out.append(":"); 3888 out.append(typename); 3889 out.append("/"); 3890 out.append(entryname); 3891 } catch (Resources.NotFoundException e) { 3892 } 3893 } 3894 } 3895 out.append("}"); 3896 return out.toString(); 3897 } 3898 3899 /** 3900 * <p> 3901 * Initializes the fading edges from a given set of styled attributes. This 3902 * method should be called by subclasses that need fading edges and when an 3903 * instance of these subclasses is created programmatically rather than 3904 * being inflated from XML. This method is automatically called when the XML 3905 * is inflated. 3906 * </p> 3907 * 3908 * @param a the styled attributes set to initialize the fading edges from 3909 */ 3910 protected void initializeFadingEdge(TypedArray a) { 3911 initScrollCache(); 3912 3913 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3914 R.styleable.View_fadingEdgeLength, 3915 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3916 } 3917 3918 /** 3919 * Returns the size of the vertical faded edges used to indicate that more 3920 * content in this view is visible. 3921 * 3922 * @return The size in pixels of the vertical faded edge or 0 if vertical 3923 * faded edges are not enabled for this view. 3924 * @attr ref android.R.styleable#View_fadingEdgeLength 3925 */ 3926 public int getVerticalFadingEdgeLength() { 3927 if (isVerticalFadingEdgeEnabled()) { 3928 ScrollabilityCache cache = mScrollCache; 3929 if (cache != null) { 3930 return cache.fadingEdgeLength; 3931 } 3932 } 3933 return 0; 3934 } 3935 3936 /** 3937 * Set the size of the faded edge used to indicate that more content in this 3938 * view is available. Will not change whether the fading edge is enabled; use 3939 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3940 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3941 * for the vertical or horizontal fading edges. 3942 * 3943 * @param length The size in pixels of the faded edge used to indicate that more 3944 * content in this view is visible. 3945 */ 3946 public void setFadingEdgeLength(int length) { 3947 initScrollCache(); 3948 mScrollCache.fadingEdgeLength = length; 3949 } 3950 3951 /** 3952 * Returns the size of the horizontal faded edges used to indicate that more 3953 * content in this view is visible. 3954 * 3955 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3956 * faded edges are not enabled for this view. 3957 * @attr ref android.R.styleable#View_fadingEdgeLength 3958 */ 3959 public int getHorizontalFadingEdgeLength() { 3960 if (isHorizontalFadingEdgeEnabled()) { 3961 ScrollabilityCache cache = mScrollCache; 3962 if (cache != null) { 3963 return cache.fadingEdgeLength; 3964 } 3965 } 3966 return 0; 3967 } 3968 3969 /** 3970 * Returns the width of the vertical scrollbar. 3971 * 3972 * @return The width in pixels of the vertical scrollbar or 0 if there 3973 * is no vertical scrollbar. 3974 */ 3975 public int getVerticalScrollbarWidth() { 3976 ScrollabilityCache cache = mScrollCache; 3977 if (cache != null) { 3978 ScrollBarDrawable scrollBar = cache.scrollBar; 3979 if (scrollBar != null) { 3980 int size = scrollBar.getSize(true); 3981 if (size <= 0) { 3982 size = cache.scrollBarSize; 3983 } 3984 return size; 3985 } 3986 return 0; 3987 } 3988 return 0; 3989 } 3990 3991 /** 3992 * Returns the height of the horizontal scrollbar. 3993 * 3994 * @return The height in pixels of the horizontal scrollbar or 0 if 3995 * there is no horizontal scrollbar. 3996 */ 3997 protected int getHorizontalScrollbarHeight() { 3998 ScrollabilityCache cache = mScrollCache; 3999 if (cache != null) { 4000 ScrollBarDrawable scrollBar = cache.scrollBar; 4001 if (scrollBar != null) { 4002 int size = scrollBar.getSize(false); 4003 if (size <= 0) { 4004 size = cache.scrollBarSize; 4005 } 4006 return size; 4007 } 4008 return 0; 4009 } 4010 return 0; 4011 } 4012 4013 /** 4014 * <p> 4015 * Initializes the scrollbars from a given set of styled attributes. This 4016 * method should be called by subclasses that need scrollbars and when an 4017 * instance of these subclasses is created programmatically rather than 4018 * being inflated from XML. This method is automatically called when the XML 4019 * is inflated. 4020 * </p> 4021 * 4022 * @param a the styled attributes set to initialize the scrollbars from 4023 */ 4024 protected void initializeScrollbars(TypedArray a) { 4025 initScrollCache(); 4026 4027 final ScrollabilityCache scrollabilityCache = mScrollCache; 4028 4029 if (scrollabilityCache.scrollBar == null) { 4030 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 4031 } 4032 4033 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 4034 4035 if (!fadeScrollbars) { 4036 scrollabilityCache.state = ScrollabilityCache.ON; 4037 } 4038 scrollabilityCache.fadeScrollBars = fadeScrollbars; 4039 4040 4041 scrollabilityCache.scrollBarFadeDuration = a.getInt( 4042 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 4043 .getScrollBarFadeDuration()); 4044 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 4045 R.styleable.View_scrollbarDefaultDelayBeforeFade, 4046 ViewConfiguration.getScrollDefaultDelay()); 4047 4048 4049 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 4050 com.android.internal.R.styleable.View_scrollbarSize, 4051 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 4052 4053 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 4054 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 4055 4056 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 4057 if (thumb != null) { 4058 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 4059 } 4060 4061 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 4062 false); 4063 if (alwaysDraw) { 4064 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4065 } 4066 4067 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4068 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4069 4070 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4071 if (thumb != null) { 4072 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4073 } 4074 4075 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4076 false); 4077 if (alwaysDraw) { 4078 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4079 } 4080 4081 // Apply layout direction to the new Drawables if needed 4082 final int layoutDirection = getLayoutDirection(); 4083 if (track != null) { 4084 track.setLayoutDirection(layoutDirection); 4085 } 4086 if (thumb != null) { 4087 thumb.setLayoutDirection(layoutDirection); 4088 } 4089 4090 // Re-apply user/background padding so that scrollbar(s) get added 4091 resolvePadding(); 4092 } 4093 4094 /** 4095 * <p> 4096 * Initalizes the scrollability cache if necessary. 4097 * </p> 4098 */ 4099 private void initScrollCache() { 4100 if (mScrollCache == null) { 4101 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4102 } 4103 } 4104 4105 private ScrollabilityCache getScrollCache() { 4106 initScrollCache(); 4107 return mScrollCache; 4108 } 4109 4110 /** 4111 * Set the position of the vertical scroll bar. Should be one of 4112 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4113 * {@link #SCROLLBAR_POSITION_RIGHT}. 4114 * 4115 * @param position Where the vertical scroll bar should be positioned. 4116 */ 4117 public void setVerticalScrollbarPosition(int position) { 4118 if (mVerticalScrollbarPosition != position) { 4119 mVerticalScrollbarPosition = position; 4120 computeOpaqueFlags(); 4121 resolvePadding(); 4122 } 4123 } 4124 4125 /** 4126 * @return The position where the vertical scroll bar will show, if applicable. 4127 * @see #setVerticalScrollbarPosition(int) 4128 */ 4129 public int getVerticalScrollbarPosition() { 4130 return mVerticalScrollbarPosition; 4131 } 4132 4133 ListenerInfo getListenerInfo() { 4134 if (mListenerInfo != null) { 4135 return mListenerInfo; 4136 } 4137 mListenerInfo = new ListenerInfo(); 4138 return mListenerInfo; 4139 } 4140 4141 /** 4142 * Register a callback to be invoked when focus of this view changed. 4143 * 4144 * @param l The callback that will run. 4145 */ 4146 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4147 getListenerInfo().mOnFocusChangeListener = l; 4148 } 4149 4150 /** 4151 * Add a listener that will be called when the bounds of the view change due to 4152 * layout processing. 4153 * 4154 * @param listener The listener that will be called when layout bounds change. 4155 */ 4156 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4157 ListenerInfo li = getListenerInfo(); 4158 if (li.mOnLayoutChangeListeners == null) { 4159 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4160 } 4161 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4162 li.mOnLayoutChangeListeners.add(listener); 4163 } 4164 } 4165 4166 /** 4167 * Remove a listener for layout changes. 4168 * 4169 * @param listener The listener for layout bounds change. 4170 */ 4171 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4172 ListenerInfo li = mListenerInfo; 4173 if (li == null || li.mOnLayoutChangeListeners == null) { 4174 return; 4175 } 4176 li.mOnLayoutChangeListeners.remove(listener); 4177 } 4178 4179 /** 4180 * Add a listener for attach state changes. 4181 * 4182 * This listener will be called whenever this view is attached or detached 4183 * from a window. Remove the listener using 4184 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4185 * 4186 * @param listener Listener to attach 4187 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4188 */ 4189 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4190 ListenerInfo li = getListenerInfo(); 4191 if (li.mOnAttachStateChangeListeners == null) { 4192 li.mOnAttachStateChangeListeners 4193 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4194 } 4195 li.mOnAttachStateChangeListeners.add(listener); 4196 } 4197 4198 /** 4199 * Remove a listener for attach state changes. The listener will receive no further 4200 * notification of window attach/detach events. 4201 * 4202 * @param listener Listener to remove 4203 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4204 */ 4205 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4206 ListenerInfo li = mListenerInfo; 4207 if (li == null || li.mOnAttachStateChangeListeners == null) { 4208 return; 4209 } 4210 li.mOnAttachStateChangeListeners.remove(listener); 4211 } 4212 4213 /** 4214 * Returns the focus-change callback registered for this view. 4215 * 4216 * @return The callback, or null if one is not registered. 4217 */ 4218 public OnFocusChangeListener getOnFocusChangeListener() { 4219 ListenerInfo li = mListenerInfo; 4220 return li != null ? li.mOnFocusChangeListener : null; 4221 } 4222 4223 /** 4224 * Register a callback to be invoked when this view is clicked. If this view is not 4225 * clickable, it becomes clickable. 4226 * 4227 * @param l The callback that will run 4228 * 4229 * @see #setClickable(boolean) 4230 */ 4231 public void setOnClickListener(OnClickListener l) { 4232 if (!isClickable()) { 4233 setClickable(true); 4234 } 4235 getListenerInfo().mOnClickListener = l; 4236 } 4237 4238 /** 4239 * Return whether this view has an attached OnClickListener. Returns 4240 * true if there is a listener, false if there is none. 4241 */ 4242 public boolean hasOnClickListeners() { 4243 ListenerInfo li = mListenerInfo; 4244 return (li != null && li.mOnClickListener != null); 4245 } 4246 4247 /** 4248 * Register a callback to be invoked when this view is clicked and held. If this view is not 4249 * long clickable, it becomes long clickable. 4250 * 4251 * @param l The callback that will run 4252 * 4253 * @see #setLongClickable(boolean) 4254 */ 4255 public void setOnLongClickListener(OnLongClickListener l) { 4256 if (!isLongClickable()) { 4257 setLongClickable(true); 4258 } 4259 getListenerInfo().mOnLongClickListener = l; 4260 } 4261 4262 /** 4263 * Register a callback to be invoked when the context menu for this view is 4264 * being built. If this view is not long clickable, it becomes long clickable. 4265 * 4266 * @param l The callback that will run 4267 * 4268 */ 4269 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4270 if (!isLongClickable()) { 4271 setLongClickable(true); 4272 } 4273 getListenerInfo().mOnCreateContextMenuListener = l; 4274 } 4275 4276 /** 4277 * Call this view's OnClickListener, if it is defined. Performs all normal 4278 * actions associated with clicking: reporting accessibility event, playing 4279 * a sound, etc. 4280 * 4281 * @return True there was an assigned OnClickListener that was called, false 4282 * otherwise is returned. 4283 */ 4284 public boolean performClick() { 4285 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4286 4287 ListenerInfo li = mListenerInfo; 4288 if (li != null && li.mOnClickListener != null) { 4289 playSoundEffect(SoundEffectConstants.CLICK); 4290 li.mOnClickListener.onClick(this); 4291 return true; 4292 } 4293 4294 return false; 4295 } 4296 4297 /** 4298 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4299 * this only calls the listener, and does not do any associated clicking 4300 * actions like reporting an accessibility event. 4301 * 4302 * @return True there was an assigned OnClickListener that was called, false 4303 * otherwise is returned. 4304 */ 4305 public boolean callOnClick() { 4306 ListenerInfo li = mListenerInfo; 4307 if (li != null && li.mOnClickListener != null) { 4308 li.mOnClickListener.onClick(this); 4309 return true; 4310 } 4311 return false; 4312 } 4313 4314 /** 4315 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4316 * OnLongClickListener did not consume the event. 4317 * 4318 * @return True if one of the above receivers consumed the event, false otherwise. 4319 */ 4320 public boolean performLongClick() { 4321 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4322 4323 boolean handled = false; 4324 ListenerInfo li = mListenerInfo; 4325 if (li != null && li.mOnLongClickListener != null) { 4326 handled = li.mOnLongClickListener.onLongClick(View.this); 4327 } 4328 if (!handled) { 4329 handled = showContextMenu(); 4330 } 4331 if (handled) { 4332 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4333 } 4334 return handled; 4335 } 4336 4337 /** 4338 * Performs button-related actions during a touch down event. 4339 * 4340 * @param event The event. 4341 * @return True if the down was consumed. 4342 * 4343 * @hide 4344 */ 4345 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4346 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4347 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4348 return true; 4349 } 4350 } 4351 return false; 4352 } 4353 4354 /** 4355 * Bring up the context menu for this view. 4356 * 4357 * @return Whether a context menu was displayed. 4358 */ 4359 public boolean showContextMenu() { 4360 return getParent().showContextMenuForChild(this); 4361 } 4362 4363 /** 4364 * Bring up the context menu for this view, referring to the item under the specified point. 4365 * 4366 * @param x The referenced x coordinate. 4367 * @param y The referenced y coordinate. 4368 * @param metaState The keyboard modifiers that were pressed. 4369 * @return Whether a context menu was displayed. 4370 * 4371 * @hide 4372 */ 4373 public boolean showContextMenu(float x, float y, int metaState) { 4374 return showContextMenu(); 4375 } 4376 4377 /** 4378 * Start an action mode. 4379 * 4380 * @param callback Callback that will control the lifecycle of the action mode 4381 * @return The new action mode if it is started, null otherwise 4382 * 4383 * @see ActionMode 4384 */ 4385 public ActionMode startActionMode(ActionMode.Callback callback) { 4386 ViewParent parent = getParent(); 4387 if (parent == null) return null; 4388 return parent.startActionModeForChild(this, callback); 4389 } 4390 4391 /** 4392 * Register a callback to be invoked when a hardware key is pressed in this view. 4393 * Key presses in software input methods will generally not trigger the methods of 4394 * this listener. 4395 * @param l the key listener to attach to this view 4396 */ 4397 public void setOnKeyListener(OnKeyListener l) { 4398 getListenerInfo().mOnKeyListener = l; 4399 } 4400 4401 /** 4402 * Register a callback to be invoked when a touch event is sent to this view. 4403 * @param l the touch listener to attach to this view 4404 */ 4405 public void setOnTouchListener(OnTouchListener l) { 4406 getListenerInfo().mOnTouchListener = l; 4407 } 4408 4409 /** 4410 * Register a callback to be invoked when a generic motion event is sent to this view. 4411 * @param l the generic motion listener to attach to this view 4412 */ 4413 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4414 getListenerInfo().mOnGenericMotionListener = l; 4415 } 4416 4417 /** 4418 * Register a callback to be invoked when a hover event is sent to this view. 4419 * @param l the hover listener to attach to this view 4420 */ 4421 public void setOnHoverListener(OnHoverListener l) { 4422 getListenerInfo().mOnHoverListener = l; 4423 } 4424 4425 /** 4426 * Register a drag event listener callback object for this View. The parameter is 4427 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4428 * View, the system calls the 4429 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4430 * @param l An implementation of {@link android.view.View.OnDragListener}. 4431 */ 4432 public void setOnDragListener(OnDragListener l) { 4433 getListenerInfo().mOnDragListener = l; 4434 } 4435 4436 /** 4437 * Give this view focus. This will cause 4438 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4439 * 4440 * Note: this does not check whether this {@link View} should get focus, it just 4441 * gives it focus no matter what. It should only be called internally by framework 4442 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4443 * 4444 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4445 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4446 * focus moved when requestFocus() is called. It may not always 4447 * apply, in which case use the default View.FOCUS_DOWN. 4448 * @param previouslyFocusedRect The rectangle of the view that had focus 4449 * prior in this View's coordinate system. 4450 */ 4451 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4452 if (DBG) { 4453 System.out.println(this + " requestFocus()"); 4454 } 4455 4456 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4457 mPrivateFlags |= PFLAG_FOCUSED; 4458 4459 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4460 4461 if (mParent != null) { 4462 mParent.requestChildFocus(this, this); 4463 } 4464 4465 if (mAttachInfo != null) { 4466 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4467 } 4468 4469 onFocusChanged(true, direction, previouslyFocusedRect); 4470 refreshDrawableState(); 4471 } 4472 } 4473 4474 /** 4475 * Request that a rectangle of this view be visible on the screen, 4476 * scrolling if necessary just enough. 4477 * 4478 * <p>A View should call this if it maintains some notion of which part 4479 * of its content is interesting. For example, a text editing view 4480 * should call this when its cursor moves. 4481 * 4482 * @param rectangle The rectangle. 4483 * @return Whether any parent scrolled. 4484 */ 4485 public boolean requestRectangleOnScreen(Rect rectangle) { 4486 return requestRectangleOnScreen(rectangle, false); 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 * <p>When <code>immediate</code> is set to true, scrolling will not be 4498 * animated. 4499 * 4500 * @param rectangle The rectangle. 4501 * @param immediate True to forbid animated scrolling, false otherwise 4502 * @return Whether any parent scrolled. 4503 */ 4504 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4505 if (mParent == null) { 4506 return false; 4507 } 4508 4509 View child = this; 4510 4511 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4512 position.set(rectangle); 4513 4514 ViewParent parent = mParent; 4515 boolean scrolled = false; 4516 while (parent != null) { 4517 rectangle.set((int) position.left, (int) position.top, 4518 (int) position.right, (int) position.bottom); 4519 4520 scrolled |= parent.requestChildRectangleOnScreen(child, 4521 rectangle, immediate); 4522 4523 if (!child.hasIdentityMatrix()) { 4524 child.getMatrix().mapRect(position); 4525 } 4526 4527 position.offset(child.mLeft, child.mTop); 4528 4529 if (!(parent instanceof View)) { 4530 break; 4531 } 4532 4533 View parentView = (View) parent; 4534 4535 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4536 4537 child = parentView; 4538 parent = child.getParent(); 4539 } 4540 4541 return scrolled; 4542 } 4543 4544 /** 4545 * Called when this view wants to give up focus. If focus is cleared 4546 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4547 * <p> 4548 * <strong>Note:</strong> When a View clears focus the framework is trying 4549 * to give focus to the first focusable View from the top. Hence, if this 4550 * View is the first from the top that can take focus, then all callbacks 4551 * related to clearing focus will be invoked after wich the framework will 4552 * give focus to this view. 4553 * </p> 4554 */ 4555 public void clearFocus() { 4556 if (DBG) { 4557 System.out.println(this + " clearFocus()"); 4558 } 4559 4560 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4561 mPrivateFlags &= ~PFLAG_FOCUSED; 4562 4563 if (mParent != null) { 4564 mParent.clearChildFocus(this); 4565 } 4566 4567 onFocusChanged(false, 0, null); 4568 4569 refreshDrawableState(); 4570 4571 if (!rootViewRequestFocus()) { 4572 notifyGlobalFocusCleared(this); 4573 } 4574 } 4575 } 4576 4577 void notifyGlobalFocusCleared(View oldFocus) { 4578 if (oldFocus != null && mAttachInfo != null) { 4579 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 4580 } 4581 } 4582 4583 boolean rootViewRequestFocus() { 4584 final View root = getRootView(); 4585 return root != null && root.requestFocus(); 4586 } 4587 4588 /** 4589 * Called internally by the view system when a new view is getting focus. 4590 * This is what clears the old focus. 4591 */ 4592 void unFocus() { 4593 if (DBG) { 4594 System.out.println(this + " unFocus()"); 4595 } 4596 4597 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4598 mPrivateFlags &= ~PFLAG_FOCUSED; 4599 4600 onFocusChanged(false, 0, null); 4601 refreshDrawableState(); 4602 } 4603 } 4604 4605 /** 4606 * Returns true if this view has focus iteself, or is the ancestor of the 4607 * view that has focus. 4608 * 4609 * @return True if this view has or contains focus, false otherwise. 4610 */ 4611 @ViewDebug.ExportedProperty(category = "focus") 4612 public boolean hasFocus() { 4613 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4614 } 4615 4616 /** 4617 * Returns true if this view is focusable or if it contains a reachable View 4618 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4619 * is a View whose parents do not block descendants focus. 4620 * 4621 * Only {@link #VISIBLE} views are considered focusable. 4622 * 4623 * @return True if the view is focusable or if the view contains a focusable 4624 * View, false otherwise. 4625 * 4626 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4627 */ 4628 public boolean hasFocusable() { 4629 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4630 } 4631 4632 /** 4633 * Called by the view system when the focus state of this view changes. 4634 * When the focus change event is caused by directional navigation, direction 4635 * and previouslyFocusedRect provide insight into where the focus is coming from. 4636 * When overriding, be sure to call up through to the super class so that 4637 * the standard focus handling will occur. 4638 * 4639 * @param gainFocus True if the View has focus; false otherwise. 4640 * @param direction The direction focus has moved when requestFocus() 4641 * is called to give this view focus. Values are 4642 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4643 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4644 * It may not always apply, in which case use the default. 4645 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4646 * system, of the previously focused view. If applicable, this will be 4647 * passed in as finer grained information about where the focus is coming 4648 * from (in addition to direction). Will be <code>null</code> otherwise. 4649 */ 4650 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4651 if (gainFocus) { 4652 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4653 } else { 4654 notifyViewAccessibilityStateChangedIfNeeded(); 4655 } 4656 4657 InputMethodManager imm = InputMethodManager.peekInstance(); 4658 if (!gainFocus) { 4659 if (isPressed()) { 4660 setPressed(false); 4661 } 4662 if (imm != null && mAttachInfo != null 4663 && mAttachInfo.mHasWindowFocus) { 4664 imm.focusOut(this); 4665 } 4666 onFocusLost(); 4667 } else if (imm != null && mAttachInfo != null 4668 && mAttachInfo.mHasWindowFocus) { 4669 imm.focusIn(this); 4670 } 4671 4672 invalidate(true); 4673 ListenerInfo li = mListenerInfo; 4674 if (li != null && li.mOnFocusChangeListener != null) { 4675 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4676 } 4677 4678 if (mAttachInfo != null) { 4679 mAttachInfo.mKeyDispatchState.reset(this); 4680 } 4681 } 4682 4683 /** 4684 * Sends an accessibility event of the given type. If accessibility is 4685 * not enabled this method has no effect. The default implementation calls 4686 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4687 * to populate information about the event source (this View), then calls 4688 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4689 * populate the text content of the event source including its descendants, 4690 * and last calls 4691 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4692 * on its parent to resuest sending of the event to interested parties. 4693 * <p> 4694 * If an {@link AccessibilityDelegate} has been specified via calling 4695 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4696 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4697 * responsible for handling this call. 4698 * </p> 4699 * 4700 * @param eventType The type of the event to send, as defined by several types from 4701 * {@link android.view.accessibility.AccessibilityEvent}, such as 4702 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4703 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4704 * 4705 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4706 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4707 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4708 * @see AccessibilityDelegate 4709 */ 4710 public void sendAccessibilityEvent(int eventType) { 4711 // Excluded views do not send accessibility events. 4712 if (!includeForAccessibility()) { 4713 return; 4714 } 4715 if (mAccessibilityDelegate != null) { 4716 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4717 } else { 4718 sendAccessibilityEventInternal(eventType); 4719 } 4720 } 4721 4722 /** 4723 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4724 * {@link AccessibilityEvent} to make an announcement which is related to some 4725 * sort of a context change for which none of the events representing UI transitions 4726 * is a good fit. For example, announcing a new page in a book. If accessibility 4727 * is not enabled this method does nothing. 4728 * 4729 * @param text The announcement text. 4730 */ 4731 public void announceForAccessibility(CharSequence text) { 4732 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4733 AccessibilityEvent event = AccessibilityEvent.obtain( 4734 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4735 onInitializeAccessibilityEvent(event); 4736 event.getText().add(text); 4737 event.setContentDescription(null); 4738 mParent.requestSendAccessibilityEvent(this, event); 4739 } 4740 } 4741 4742 /** 4743 * @see #sendAccessibilityEvent(int) 4744 * 4745 * Note: Called from the default {@link AccessibilityDelegate}. 4746 */ 4747 void sendAccessibilityEventInternal(int eventType) { 4748 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4749 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4750 } 4751 } 4752 4753 /** 4754 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4755 * takes as an argument an empty {@link AccessibilityEvent} and does not 4756 * perform a check whether accessibility is enabled. 4757 * <p> 4758 * If an {@link AccessibilityDelegate} has been specified via calling 4759 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4760 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4761 * is responsible for handling this call. 4762 * </p> 4763 * 4764 * @param event The event to send. 4765 * 4766 * @see #sendAccessibilityEvent(int) 4767 */ 4768 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4769 if (mAccessibilityDelegate != null) { 4770 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4771 } else { 4772 sendAccessibilityEventUncheckedInternal(event); 4773 } 4774 } 4775 4776 /** 4777 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4778 * 4779 * Note: Called from the default {@link AccessibilityDelegate}. 4780 */ 4781 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4782 if (!isShown()) { 4783 return; 4784 } 4785 onInitializeAccessibilityEvent(event); 4786 // Only a subset of accessibility events populates text content. 4787 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4788 dispatchPopulateAccessibilityEvent(event); 4789 } 4790 // In the beginning we called #isShown(), so we know that getParent() is not null. 4791 getParent().requestSendAccessibilityEvent(this, event); 4792 } 4793 4794 /** 4795 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4796 * to its children for adding their text content to the event. Note that the 4797 * event text is populated in a separate dispatch path since we add to the 4798 * event not only the text of the source but also the text of all its descendants. 4799 * A typical implementation will call 4800 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4801 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4802 * on each child. Override this method if custom population of the event text 4803 * content is required. 4804 * <p> 4805 * If an {@link AccessibilityDelegate} has been specified via calling 4806 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4807 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4808 * is responsible for handling this call. 4809 * </p> 4810 * <p> 4811 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4812 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4813 * </p> 4814 * 4815 * @param event The event. 4816 * 4817 * @return True if the event population was completed. 4818 */ 4819 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4820 if (mAccessibilityDelegate != null) { 4821 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4822 } else { 4823 return dispatchPopulateAccessibilityEventInternal(event); 4824 } 4825 } 4826 4827 /** 4828 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4829 * 4830 * Note: Called from the default {@link AccessibilityDelegate}. 4831 */ 4832 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4833 onPopulateAccessibilityEvent(event); 4834 return false; 4835 } 4836 4837 /** 4838 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4839 * giving a chance to this View to populate the accessibility event with its 4840 * text content. While this method is free to modify event 4841 * attributes other than text content, doing so should normally be performed in 4842 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4843 * <p> 4844 * Example: Adding formatted date string to an accessibility event in addition 4845 * to the text added by the super implementation: 4846 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4847 * super.onPopulateAccessibilityEvent(event); 4848 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4849 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4850 * mCurrentDate.getTimeInMillis(), flags); 4851 * event.getText().add(selectedDateUtterance); 4852 * }</pre> 4853 * <p> 4854 * If an {@link AccessibilityDelegate} has been specified via calling 4855 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4856 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4857 * is responsible for handling this call. 4858 * </p> 4859 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4860 * information to the event, in case the default implementation has basic information to add. 4861 * </p> 4862 * 4863 * @param event The accessibility event which to populate. 4864 * 4865 * @see #sendAccessibilityEvent(int) 4866 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4867 */ 4868 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4869 if (mAccessibilityDelegate != null) { 4870 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4871 } else { 4872 onPopulateAccessibilityEventInternal(event); 4873 } 4874 } 4875 4876 /** 4877 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4878 * 4879 * Note: Called from the default {@link AccessibilityDelegate}. 4880 */ 4881 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4882 } 4883 4884 /** 4885 * Initializes an {@link AccessibilityEvent} with information about 4886 * this View which is the event source. In other words, the source of 4887 * an accessibility event is the view whose state change triggered firing 4888 * the event. 4889 * <p> 4890 * Example: Setting the password property of an event in addition 4891 * to properties set by the super implementation: 4892 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4893 * super.onInitializeAccessibilityEvent(event); 4894 * event.setPassword(true); 4895 * }</pre> 4896 * <p> 4897 * If an {@link AccessibilityDelegate} has been specified via calling 4898 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4899 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4900 * is responsible for handling this call. 4901 * </p> 4902 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4903 * information to the event, in case the default implementation has basic information to add. 4904 * </p> 4905 * @param event The event to initialize. 4906 * 4907 * @see #sendAccessibilityEvent(int) 4908 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4909 */ 4910 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4911 if (mAccessibilityDelegate != null) { 4912 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4913 } else { 4914 onInitializeAccessibilityEventInternal(event); 4915 } 4916 } 4917 4918 /** 4919 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4920 * 4921 * Note: Called from the default {@link AccessibilityDelegate}. 4922 */ 4923 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4924 event.setSource(this); 4925 event.setClassName(View.class.getName()); 4926 event.setPackageName(getContext().getPackageName()); 4927 event.setEnabled(isEnabled()); 4928 event.setContentDescription(mContentDescription); 4929 4930 switch (event.getEventType()) { 4931 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 4932 ArrayList<View> focusablesTempList = (mAttachInfo != null) 4933 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 4934 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 4935 event.setItemCount(focusablesTempList.size()); 4936 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4937 if (mAttachInfo != null) { 4938 focusablesTempList.clear(); 4939 } 4940 } break; 4941 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 4942 CharSequence text = getIterableTextForAccessibility(); 4943 if (text != null && text.length() > 0) { 4944 event.setFromIndex(getAccessibilitySelectionStart()); 4945 event.setToIndex(getAccessibilitySelectionEnd()); 4946 event.setItemCount(text.length()); 4947 } 4948 } break; 4949 } 4950 } 4951 4952 /** 4953 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4954 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4955 * This method is responsible for obtaining an accessibility node info from a 4956 * pool of reusable instances and calling 4957 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4958 * initialize the former. 4959 * <p> 4960 * Note: The client is responsible for recycling the obtained instance by calling 4961 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4962 * </p> 4963 * 4964 * @return A populated {@link AccessibilityNodeInfo}. 4965 * 4966 * @see AccessibilityNodeInfo 4967 */ 4968 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4969 if (mAccessibilityDelegate != null) { 4970 return mAccessibilityDelegate.createAccessibilityNodeInfo(this); 4971 } else { 4972 return createAccessibilityNodeInfoInternal(); 4973 } 4974 } 4975 4976 /** 4977 * @see #createAccessibilityNodeInfo() 4978 */ 4979 AccessibilityNodeInfo createAccessibilityNodeInfoInternal() { 4980 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4981 if (provider != null) { 4982 return provider.createAccessibilityNodeInfo(View.NO_ID); 4983 } else { 4984 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4985 onInitializeAccessibilityNodeInfo(info); 4986 return info; 4987 } 4988 } 4989 4990 /** 4991 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4992 * The base implementation sets: 4993 * <ul> 4994 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4995 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4996 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4997 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4998 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4999 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 5000 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 5001 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 5002 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 5003 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 5004 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 5005 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 5006 * </ul> 5007 * <p> 5008 * Subclasses should override this method, call the super implementation, 5009 * and set additional attributes. 5010 * </p> 5011 * <p> 5012 * If an {@link AccessibilityDelegate} has been specified via calling 5013 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5014 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 5015 * is responsible for handling this call. 5016 * </p> 5017 * 5018 * @param info The instance to initialize. 5019 */ 5020 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 5021 if (mAccessibilityDelegate != null) { 5022 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 5023 } else { 5024 onInitializeAccessibilityNodeInfoInternal(info); 5025 } 5026 } 5027 5028 /** 5029 * Gets the location of this view in screen coordintates. 5030 * 5031 * @param outRect The output location 5032 */ 5033 void getBoundsOnScreen(Rect outRect) { 5034 if (mAttachInfo == null) { 5035 return; 5036 } 5037 5038 RectF position = mAttachInfo.mTmpTransformRect; 5039 position.set(0, 0, mRight - mLeft, mBottom - mTop); 5040 5041 if (!hasIdentityMatrix()) { 5042 getMatrix().mapRect(position); 5043 } 5044 5045 position.offset(mLeft, mTop); 5046 5047 ViewParent parent = mParent; 5048 while (parent instanceof View) { 5049 View parentView = (View) parent; 5050 5051 position.offset(-parentView.mScrollX, -parentView.mScrollY); 5052 5053 if (!parentView.hasIdentityMatrix()) { 5054 parentView.getMatrix().mapRect(position); 5055 } 5056 5057 position.offset(parentView.mLeft, parentView.mTop); 5058 5059 parent = parentView.mParent; 5060 } 5061 5062 if (parent instanceof ViewRootImpl) { 5063 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5064 position.offset(0, -viewRootImpl.mCurScrollY); 5065 } 5066 5067 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5068 5069 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5070 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5071 } 5072 5073 /** 5074 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5075 * 5076 * Note: Called from the default {@link AccessibilityDelegate}. 5077 */ 5078 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5079 Rect bounds = mAttachInfo.mTmpInvalRect; 5080 5081 getDrawingRect(bounds); 5082 info.setBoundsInParent(bounds); 5083 5084 getBoundsOnScreen(bounds); 5085 info.setBoundsInScreen(bounds); 5086 5087 ViewParent parent = getParentForAccessibility(); 5088 if (parent instanceof View) { 5089 info.setParent((View) parent); 5090 } 5091 5092 if (mID != View.NO_ID) { 5093 View rootView = getRootView(); 5094 if (rootView == null) { 5095 rootView = this; 5096 } 5097 View label = rootView.findLabelForView(this, mID); 5098 if (label != null) { 5099 info.setLabeledBy(label); 5100 } 5101 5102 if ((mAttachInfo.mAccessibilityFetchFlags 5103 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 5104 && Resources.resourceHasPackage(mID)) { 5105 try { 5106 String viewId = getResources().getResourceName(mID); 5107 info.setViewIdResourceName(viewId); 5108 } catch (Resources.NotFoundException nfe) { 5109 /* ignore */ 5110 } 5111 } 5112 } 5113 5114 if (mLabelForId != View.NO_ID) { 5115 View rootView = getRootView(); 5116 if (rootView == null) { 5117 rootView = this; 5118 } 5119 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5120 if (labeled != null) { 5121 info.setLabelFor(labeled); 5122 } 5123 } 5124 5125 info.setVisibleToUser(isVisibleToUser()); 5126 5127 info.setPackageName(mContext.getPackageName()); 5128 info.setClassName(View.class.getName()); 5129 info.setContentDescription(getContentDescription()); 5130 5131 info.setEnabled(isEnabled()); 5132 info.setClickable(isClickable()); 5133 info.setFocusable(isFocusable()); 5134 info.setFocused(isFocused()); 5135 info.setAccessibilityFocused(isAccessibilityFocused()); 5136 info.setSelected(isSelected()); 5137 info.setLongClickable(isLongClickable()); 5138 5139 // TODO: These make sense only if we are in an AdapterView but all 5140 // views can be selected. Maybe from accessibility perspective 5141 // we should report as selectable view in an AdapterView. 5142 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5143 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5144 5145 if (isFocusable()) { 5146 if (isFocused()) { 5147 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5148 } else { 5149 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5150 } 5151 } 5152 5153 if (!isAccessibilityFocused()) { 5154 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5155 } else { 5156 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5157 } 5158 5159 if (isClickable() && isEnabled()) { 5160 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5161 } 5162 5163 if (isLongClickable() && isEnabled()) { 5164 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5165 } 5166 5167 CharSequence text = getIterableTextForAccessibility(); 5168 if (text != null && text.length() > 0) { 5169 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5170 5171 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5172 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5173 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5174 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5175 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5176 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5177 } 5178 } 5179 5180 private View findLabelForView(View view, int labeledId) { 5181 if (mMatchLabelForPredicate == null) { 5182 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5183 } 5184 mMatchLabelForPredicate.mLabeledId = labeledId; 5185 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5186 } 5187 5188 /** 5189 * Computes whether this view is visible to the user. Such a view is 5190 * attached, visible, all its predecessors are visible, it is not clipped 5191 * entirely by its predecessors, and has an alpha greater than zero. 5192 * 5193 * @return Whether the view is visible on the screen. 5194 * 5195 * @hide 5196 */ 5197 protected boolean isVisibleToUser() { 5198 return isVisibleToUser(null); 5199 } 5200 5201 /** 5202 * Computes whether the given portion of this view is visible to the user. 5203 * Such a view is attached, visible, all its predecessors are visible, 5204 * has an alpha greater than zero, and the specified portion is not 5205 * clipped entirely by its predecessors. 5206 * 5207 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5208 * <code>null</code>, and the entire view will be tested in this case. 5209 * When <code>true</code> is returned by the function, the actual visible 5210 * region will be stored in this parameter; that is, if boundInView is fully 5211 * contained within the view, no modification will be made, otherwise regions 5212 * outside of the visible area of the view will be clipped. 5213 * 5214 * @return Whether the specified portion of the view is visible on the screen. 5215 * 5216 * @hide 5217 */ 5218 protected boolean isVisibleToUser(Rect boundInView) { 5219 if (mAttachInfo != null) { 5220 // Attached to invisible window means this view is not visible. 5221 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5222 return false; 5223 } 5224 // An invisible predecessor or one with alpha zero means 5225 // that this view is not visible to the user. 5226 Object current = this; 5227 while (current instanceof View) { 5228 View view = (View) current; 5229 // We have attach info so this view is attached and there is no 5230 // need to check whether we reach to ViewRootImpl on the way up. 5231 if (view.getAlpha() <= 0 || view.getVisibility() != VISIBLE) { 5232 return false; 5233 } 5234 current = view.mParent; 5235 } 5236 // Check if the view is entirely covered by its predecessors. 5237 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5238 Point offset = mAttachInfo.mPoint; 5239 if (!getGlobalVisibleRect(visibleRect, offset)) { 5240 return false; 5241 } 5242 // Check if the visible portion intersects the rectangle of interest. 5243 if (boundInView != null) { 5244 visibleRect.offset(-offset.x, -offset.y); 5245 return boundInView.intersect(visibleRect); 5246 } 5247 return true; 5248 } 5249 return false; 5250 } 5251 5252 /** 5253 * Returns the delegate for implementing accessibility support via 5254 * composition. For more details see {@link AccessibilityDelegate}. 5255 * 5256 * @return The delegate, or null if none set. 5257 * 5258 * @hide 5259 */ 5260 public AccessibilityDelegate getAccessibilityDelegate() { 5261 return mAccessibilityDelegate; 5262 } 5263 5264 /** 5265 * Sets a delegate for implementing accessibility support via composition as 5266 * opposed to inheritance. The delegate's primary use is for implementing 5267 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5268 * 5269 * @param delegate The delegate instance. 5270 * 5271 * @see AccessibilityDelegate 5272 */ 5273 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5274 mAccessibilityDelegate = delegate; 5275 } 5276 5277 /** 5278 * Gets the provider for managing a virtual view hierarchy rooted at this View 5279 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5280 * that explore the window content. 5281 * <p> 5282 * If this method returns an instance, this instance is responsible for managing 5283 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5284 * View including the one representing the View itself. Similarly the returned 5285 * instance is responsible for performing accessibility actions on any virtual 5286 * view or the root view itself. 5287 * </p> 5288 * <p> 5289 * If an {@link AccessibilityDelegate} has been specified via calling 5290 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5291 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5292 * is responsible for handling this call. 5293 * </p> 5294 * 5295 * @return The provider. 5296 * 5297 * @see AccessibilityNodeProvider 5298 */ 5299 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5300 if (mAccessibilityDelegate != null) { 5301 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5302 } else { 5303 return null; 5304 } 5305 } 5306 5307 /** 5308 * Gets the unique identifier of this view on the screen for accessibility purposes. 5309 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5310 * 5311 * @return The view accessibility id. 5312 * 5313 * @hide 5314 */ 5315 public int getAccessibilityViewId() { 5316 if (mAccessibilityViewId == NO_ID) { 5317 mAccessibilityViewId = sNextAccessibilityViewId++; 5318 } 5319 return mAccessibilityViewId; 5320 } 5321 5322 /** 5323 * Gets the unique identifier of the window in which this View reseides. 5324 * 5325 * @return The window accessibility id. 5326 * 5327 * @hide 5328 */ 5329 public int getAccessibilityWindowId() { 5330 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5331 } 5332 5333 /** 5334 * Gets the {@link View} description. It briefly describes the view and is 5335 * primarily used for accessibility support. Set this property to enable 5336 * better accessibility support for your application. This is especially 5337 * true for views that do not have textual representation (For example, 5338 * ImageButton). 5339 * 5340 * @return The content description. 5341 * 5342 * @attr ref android.R.styleable#View_contentDescription 5343 */ 5344 @ViewDebug.ExportedProperty(category = "accessibility") 5345 public CharSequence getContentDescription() { 5346 return mContentDescription; 5347 } 5348 5349 /** 5350 * Sets the {@link View} description. It briefly describes the view and is 5351 * primarily used for accessibility support. Set this property to enable 5352 * better accessibility support for your application. This is especially 5353 * true for views that do not have textual representation (For example, 5354 * ImageButton). 5355 * 5356 * @param contentDescription The content description. 5357 * 5358 * @attr ref android.R.styleable#View_contentDescription 5359 */ 5360 @RemotableViewMethod 5361 public void setContentDescription(CharSequence contentDescription) { 5362 if (mContentDescription == null) { 5363 if (contentDescription == null) { 5364 return; 5365 } 5366 } else if (mContentDescription.equals(contentDescription)) { 5367 return; 5368 } 5369 mContentDescription = contentDescription; 5370 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5371 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5372 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5373 notifySubtreeAccessibilityStateChangedIfNeeded(); 5374 } else { 5375 notifyViewAccessibilityStateChangedIfNeeded(); 5376 } 5377 } 5378 5379 /** 5380 * Gets the id of a view for which this view serves as a label for 5381 * accessibility purposes. 5382 * 5383 * @return The labeled view id. 5384 */ 5385 @ViewDebug.ExportedProperty(category = "accessibility") 5386 public int getLabelFor() { 5387 return mLabelForId; 5388 } 5389 5390 /** 5391 * Sets the id of a view for which this view serves as a label for 5392 * accessibility purposes. 5393 * 5394 * @param id The labeled view id. 5395 */ 5396 @RemotableViewMethod 5397 public void setLabelFor(int id) { 5398 mLabelForId = id; 5399 if (mLabelForId != View.NO_ID 5400 && mID == View.NO_ID) { 5401 mID = generateViewId(); 5402 } 5403 } 5404 5405 /** 5406 * Invoked whenever this view loses focus, either by losing window focus or by losing 5407 * focus within its window. This method can be used to clear any state tied to the 5408 * focus. For instance, if a button is held pressed with the trackball and the window 5409 * loses focus, this method can be used to cancel the press. 5410 * 5411 * Subclasses of View overriding this method should always call super.onFocusLost(). 5412 * 5413 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5414 * @see #onWindowFocusChanged(boolean) 5415 * 5416 * @hide pending API council approval 5417 */ 5418 protected void onFocusLost() { 5419 resetPressedState(); 5420 } 5421 5422 private void resetPressedState() { 5423 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5424 return; 5425 } 5426 5427 if (isPressed()) { 5428 setPressed(false); 5429 5430 if (!mHasPerformedLongPress) { 5431 removeLongPressCallback(); 5432 } 5433 } 5434 } 5435 5436 /** 5437 * Returns true if this view has focus 5438 * 5439 * @return True if this view has focus, false otherwise. 5440 */ 5441 @ViewDebug.ExportedProperty(category = "focus") 5442 public boolean isFocused() { 5443 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5444 } 5445 5446 /** 5447 * Find the view in the hierarchy rooted at this view that currently has 5448 * focus. 5449 * 5450 * @return The view that currently has focus, or null if no focused view can 5451 * be found. 5452 */ 5453 public View findFocus() { 5454 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5455 } 5456 5457 /** 5458 * Indicates whether this view is one of the set of scrollable containers in 5459 * its window. 5460 * 5461 * @return whether this view is one of the set of scrollable containers in 5462 * its window 5463 * 5464 * @attr ref android.R.styleable#View_isScrollContainer 5465 */ 5466 public boolean isScrollContainer() { 5467 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5468 } 5469 5470 /** 5471 * Change whether this view is one of the set of scrollable containers in 5472 * its window. This will be used to determine whether the window can 5473 * resize or must pan when a soft input area is open -- scrollable 5474 * containers allow the window to use resize mode since the container 5475 * will appropriately shrink. 5476 * 5477 * @attr ref android.R.styleable#View_isScrollContainer 5478 */ 5479 public void setScrollContainer(boolean isScrollContainer) { 5480 if (isScrollContainer) { 5481 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5482 mAttachInfo.mScrollContainers.add(this); 5483 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5484 } 5485 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5486 } else { 5487 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5488 mAttachInfo.mScrollContainers.remove(this); 5489 } 5490 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5491 } 5492 } 5493 5494 /** 5495 * Returns the quality of the drawing cache. 5496 * 5497 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5498 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5499 * 5500 * @see #setDrawingCacheQuality(int) 5501 * @see #setDrawingCacheEnabled(boolean) 5502 * @see #isDrawingCacheEnabled() 5503 * 5504 * @attr ref android.R.styleable#View_drawingCacheQuality 5505 */ 5506 public int getDrawingCacheQuality() { 5507 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5508 } 5509 5510 /** 5511 * Set the drawing cache quality of this view. This value is used only when the 5512 * drawing cache is enabled 5513 * 5514 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5515 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5516 * 5517 * @see #getDrawingCacheQuality() 5518 * @see #setDrawingCacheEnabled(boolean) 5519 * @see #isDrawingCacheEnabled() 5520 * 5521 * @attr ref android.R.styleable#View_drawingCacheQuality 5522 */ 5523 public void setDrawingCacheQuality(int quality) { 5524 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5525 } 5526 5527 /** 5528 * Returns whether the screen should remain on, corresponding to the current 5529 * value of {@link #KEEP_SCREEN_ON}. 5530 * 5531 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5532 * 5533 * @see #setKeepScreenOn(boolean) 5534 * 5535 * @attr ref android.R.styleable#View_keepScreenOn 5536 */ 5537 public boolean getKeepScreenOn() { 5538 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5539 } 5540 5541 /** 5542 * Controls whether the screen should remain on, modifying the 5543 * value of {@link #KEEP_SCREEN_ON}. 5544 * 5545 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5546 * 5547 * @see #getKeepScreenOn() 5548 * 5549 * @attr ref android.R.styleable#View_keepScreenOn 5550 */ 5551 public void setKeepScreenOn(boolean keepScreenOn) { 5552 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5553 } 5554 5555 /** 5556 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5557 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5558 * 5559 * @attr ref android.R.styleable#View_nextFocusLeft 5560 */ 5561 public int getNextFocusLeftId() { 5562 return mNextFocusLeftId; 5563 } 5564 5565 /** 5566 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5567 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5568 * decide automatically. 5569 * 5570 * @attr ref android.R.styleable#View_nextFocusLeft 5571 */ 5572 public void setNextFocusLeftId(int nextFocusLeftId) { 5573 mNextFocusLeftId = nextFocusLeftId; 5574 } 5575 5576 /** 5577 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5578 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5579 * 5580 * @attr ref android.R.styleable#View_nextFocusRight 5581 */ 5582 public int getNextFocusRightId() { 5583 return mNextFocusRightId; 5584 } 5585 5586 /** 5587 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5588 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5589 * decide automatically. 5590 * 5591 * @attr ref android.R.styleable#View_nextFocusRight 5592 */ 5593 public void setNextFocusRightId(int nextFocusRightId) { 5594 mNextFocusRightId = nextFocusRightId; 5595 } 5596 5597 /** 5598 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5599 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5600 * 5601 * @attr ref android.R.styleable#View_nextFocusUp 5602 */ 5603 public int getNextFocusUpId() { 5604 return mNextFocusUpId; 5605 } 5606 5607 /** 5608 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5609 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5610 * decide automatically. 5611 * 5612 * @attr ref android.R.styleable#View_nextFocusUp 5613 */ 5614 public void setNextFocusUpId(int nextFocusUpId) { 5615 mNextFocusUpId = nextFocusUpId; 5616 } 5617 5618 /** 5619 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5620 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5621 * 5622 * @attr ref android.R.styleable#View_nextFocusDown 5623 */ 5624 public int getNextFocusDownId() { 5625 return mNextFocusDownId; 5626 } 5627 5628 /** 5629 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5630 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5631 * decide automatically. 5632 * 5633 * @attr ref android.R.styleable#View_nextFocusDown 5634 */ 5635 public void setNextFocusDownId(int nextFocusDownId) { 5636 mNextFocusDownId = nextFocusDownId; 5637 } 5638 5639 /** 5640 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5641 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5642 * 5643 * @attr ref android.R.styleable#View_nextFocusForward 5644 */ 5645 public int getNextFocusForwardId() { 5646 return mNextFocusForwardId; 5647 } 5648 5649 /** 5650 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5651 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5652 * decide automatically. 5653 * 5654 * @attr ref android.R.styleable#View_nextFocusForward 5655 */ 5656 public void setNextFocusForwardId(int nextFocusForwardId) { 5657 mNextFocusForwardId = nextFocusForwardId; 5658 } 5659 5660 /** 5661 * Returns the visibility of this view and all of its ancestors 5662 * 5663 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5664 */ 5665 public boolean isShown() { 5666 View current = this; 5667 //noinspection ConstantConditions 5668 do { 5669 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5670 return false; 5671 } 5672 ViewParent parent = current.mParent; 5673 if (parent == null) { 5674 return false; // We are not attached to the view root 5675 } 5676 if (!(parent instanceof View)) { 5677 return true; 5678 } 5679 current = (View) parent; 5680 } while (current != null); 5681 5682 return false; 5683 } 5684 5685 /** 5686 * Called by the view hierarchy when the content insets for a window have 5687 * changed, to allow it to adjust its content to fit within those windows. 5688 * The content insets tell you the space that the status bar, input method, 5689 * and other system windows infringe on the application's window. 5690 * 5691 * <p>You do not normally need to deal with this function, since the default 5692 * window decoration given to applications takes care of applying it to the 5693 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5694 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5695 * and your content can be placed under those system elements. You can then 5696 * use this method within your view hierarchy if you have parts of your UI 5697 * which you would like to ensure are not being covered. 5698 * 5699 * <p>The default implementation of this method simply applies the content 5700 * insets to the view's padding, consuming that content (modifying the 5701 * insets to be 0), and returning true. This behavior is off by default, but can 5702 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5703 * 5704 * <p>This function's traversal down the hierarchy is depth-first. The same content 5705 * insets object is propagated down the hierarchy, so any changes made to it will 5706 * be seen by all following views (including potentially ones above in 5707 * the hierarchy since this is a depth-first traversal). The first view 5708 * that returns true will abort the entire traversal. 5709 * 5710 * <p>The default implementation works well for a situation where it is 5711 * used with a container that covers the entire window, allowing it to 5712 * apply the appropriate insets to its content on all edges. If you need 5713 * a more complicated layout (such as two different views fitting system 5714 * windows, one on the top of the window, and one on the bottom), 5715 * you can override the method and handle the insets however you would like. 5716 * Note that the insets provided by the framework are always relative to the 5717 * far edges of the window, not accounting for the location of the called view 5718 * within that window. (In fact when this method is called you do not yet know 5719 * where the layout will place the view, as it is done before layout happens.) 5720 * 5721 * <p>Note: unlike many View methods, there is no dispatch phase to this 5722 * call. If you are overriding it in a ViewGroup and want to allow the 5723 * call to continue to your children, you must be sure to call the super 5724 * implementation. 5725 * 5726 * <p>Here is a sample layout that makes use of fitting system windows 5727 * to have controls for a video view placed inside of the window decorations 5728 * that it hides and shows. This can be used with code like the second 5729 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5730 * 5731 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5732 * 5733 * @param insets Current content insets of the window. Prior to 5734 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5735 * the insets or else you and Android will be unhappy. 5736 * 5737 * @return {@code true} if this view applied the insets and it should not 5738 * continue propagating further down the hierarchy, {@code false} otherwise. 5739 * @see #getFitsSystemWindows() 5740 * @see #setFitsSystemWindows(boolean) 5741 * @see #setSystemUiVisibility(int) 5742 */ 5743 protected boolean fitSystemWindows(Rect insets) { 5744 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5745 mUserPaddingStart = UNDEFINED_PADDING; 5746 mUserPaddingEnd = UNDEFINED_PADDING; 5747 Rect localInsets = sThreadLocal.get(); 5748 if (localInsets == null) { 5749 localInsets = new Rect(); 5750 sThreadLocal.set(localInsets); 5751 } 5752 boolean res = computeFitSystemWindows(insets, localInsets); 5753 internalSetPadding(localInsets.left, localInsets.top, 5754 localInsets.right, localInsets.bottom); 5755 return res; 5756 } 5757 return false; 5758 } 5759 5760 /** 5761 * @hide Compute the insets that should be consumed by this view and the ones 5762 * that should propagate to those under it. 5763 */ 5764 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 5765 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5766 || mAttachInfo == null 5767 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 5768 && !mAttachInfo.mOverscanRequested)) { 5769 outLocalInsets.set(inoutInsets); 5770 inoutInsets.set(0, 0, 0, 0); 5771 return true; 5772 } else { 5773 // The application wants to take care of fitting system window for 5774 // the content... however we still need to take care of any overscan here. 5775 final Rect overscan = mAttachInfo.mOverscanInsets; 5776 outLocalInsets.set(overscan); 5777 inoutInsets.left -= overscan.left; 5778 inoutInsets.top -= overscan.top; 5779 inoutInsets.right -= overscan.right; 5780 inoutInsets.bottom -= overscan.bottom; 5781 return false; 5782 } 5783 } 5784 5785 /** 5786 * Sets whether or not this view should account for system screen decorations 5787 * such as the status bar and inset its content; that is, controlling whether 5788 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5789 * executed. See that method for more details. 5790 * 5791 * <p>Note that if you are providing your own implementation of 5792 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5793 * flag to true -- your implementation will be overriding the default 5794 * implementation that checks this flag. 5795 * 5796 * @param fitSystemWindows If true, then the default implementation of 5797 * {@link #fitSystemWindows(Rect)} will be executed. 5798 * 5799 * @attr ref android.R.styleable#View_fitsSystemWindows 5800 * @see #getFitsSystemWindows() 5801 * @see #fitSystemWindows(Rect) 5802 * @see #setSystemUiVisibility(int) 5803 */ 5804 public void setFitsSystemWindows(boolean fitSystemWindows) { 5805 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5806 } 5807 5808 /** 5809 * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method 5810 * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)} 5811 * will be executed. 5812 * 5813 * @return {@code true} if the default implementation of 5814 * {@link #fitSystemWindows(Rect)} will be executed. 5815 * 5816 * @attr ref android.R.styleable#View_fitsSystemWindows 5817 * @see #setFitsSystemWindows(boolean) 5818 * @see #fitSystemWindows(Rect) 5819 * @see #setSystemUiVisibility(int) 5820 */ 5821 public boolean getFitsSystemWindows() { 5822 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5823 } 5824 5825 /** @hide */ 5826 public boolean fitsSystemWindows() { 5827 return getFitsSystemWindows(); 5828 } 5829 5830 /** 5831 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5832 */ 5833 public void requestFitSystemWindows() { 5834 if (mParent != null) { 5835 mParent.requestFitSystemWindows(); 5836 } 5837 } 5838 5839 /** 5840 * For use by PhoneWindow to make its own system window fitting optional. 5841 * @hide 5842 */ 5843 public void makeOptionalFitsSystemWindows() { 5844 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5845 } 5846 5847 /** 5848 * Returns the visibility status for this view. 5849 * 5850 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5851 * @attr ref android.R.styleable#View_visibility 5852 */ 5853 @ViewDebug.ExportedProperty(mapping = { 5854 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5855 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5856 @ViewDebug.IntToString(from = GONE, to = "GONE") 5857 }) 5858 public int getVisibility() { 5859 return mViewFlags & VISIBILITY_MASK; 5860 } 5861 5862 /** 5863 * Set the enabled state of this view. 5864 * 5865 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5866 * @attr ref android.R.styleable#View_visibility 5867 */ 5868 @RemotableViewMethod 5869 public void setVisibility(int visibility) { 5870 setFlags(visibility, VISIBILITY_MASK); 5871 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5872 } 5873 5874 /** 5875 * Returns the enabled status for this view. The interpretation of the 5876 * enabled state varies by subclass. 5877 * 5878 * @return True if this view is enabled, false otherwise. 5879 */ 5880 @ViewDebug.ExportedProperty 5881 public boolean isEnabled() { 5882 return (mViewFlags & ENABLED_MASK) == ENABLED; 5883 } 5884 5885 /** 5886 * Set the enabled state of this view. The interpretation of the enabled 5887 * state varies by subclass. 5888 * 5889 * @param enabled True if this view is enabled, false otherwise. 5890 */ 5891 @RemotableViewMethod 5892 public void setEnabled(boolean enabled) { 5893 if (enabled == isEnabled()) return; 5894 5895 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5896 5897 /* 5898 * The View most likely has to change its appearance, so refresh 5899 * the drawable state. 5900 */ 5901 refreshDrawableState(); 5902 5903 // Invalidate too, since the default behavior for views is to be 5904 // be drawn at 50% alpha rather than to change the drawable. 5905 invalidate(true); 5906 } 5907 5908 /** 5909 * Set whether this view can receive the focus. 5910 * 5911 * Setting this to false will also ensure that this view is not focusable 5912 * in touch mode. 5913 * 5914 * @param focusable If true, this view can receive the focus. 5915 * 5916 * @see #setFocusableInTouchMode(boolean) 5917 * @attr ref android.R.styleable#View_focusable 5918 */ 5919 public void setFocusable(boolean focusable) { 5920 if (!focusable) { 5921 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5922 } 5923 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5924 } 5925 5926 /** 5927 * Set whether this view can receive focus while in touch mode. 5928 * 5929 * Setting this to true will also ensure that this view is focusable. 5930 * 5931 * @param focusableInTouchMode If true, this view can receive the focus while 5932 * in touch mode. 5933 * 5934 * @see #setFocusable(boolean) 5935 * @attr ref android.R.styleable#View_focusableInTouchMode 5936 */ 5937 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5938 // Focusable in touch mode should always be set before the focusable flag 5939 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5940 // which, in touch mode, will not successfully request focus on this view 5941 // because the focusable in touch mode flag is not set 5942 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5943 if (focusableInTouchMode) { 5944 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5945 } 5946 } 5947 5948 /** 5949 * Set whether this view should have sound effects enabled for events such as 5950 * clicking and touching. 5951 * 5952 * <p>You may wish to disable sound effects for a view if you already play sounds, 5953 * for instance, a dial key that plays dtmf tones. 5954 * 5955 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5956 * @see #isSoundEffectsEnabled() 5957 * @see #playSoundEffect(int) 5958 * @attr ref android.R.styleable#View_soundEffectsEnabled 5959 */ 5960 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5961 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5962 } 5963 5964 /** 5965 * @return whether this view should have sound effects enabled for events such as 5966 * clicking and touching. 5967 * 5968 * @see #setSoundEffectsEnabled(boolean) 5969 * @see #playSoundEffect(int) 5970 * @attr ref android.R.styleable#View_soundEffectsEnabled 5971 */ 5972 @ViewDebug.ExportedProperty 5973 public boolean isSoundEffectsEnabled() { 5974 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5975 } 5976 5977 /** 5978 * Set whether this view should have haptic feedback for events such as 5979 * long presses. 5980 * 5981 * <p>You may wish to disable haptic feedback if your view already controls 5982 * its own haptic feedback. 5983 * 5984 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5985 * @see #isHapticFeedbackEnabled() 5986 * @see #performHapticFeedback(int) 5987 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5988 */ 5989 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5990 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5991 } 5992 5993 /** 5994 * @return whether this view should have haptic feedback enabled for events 5995 * long presses. 5996 * 5997 * @see #setHapticFeedbackEnabled(boolean) 5998 * @see #performHapticFeedback(int) 5999 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6000 */ 6001 @ViewDebug.ExportedProperty 6002 public boolean isHapticFeedbackEnabled() { 6003 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 6004 } 6005 6006 /** 6007 * Returns the layout direction for this view. 6008 * 6009 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 6010 * {@link #LAYOUT_DIRECTION_RTL}, 6011 * {@link #LAYOUT_DIRECTION_INHERIT} or 6012 * {@link #LAYOUT_DIRECTION_LOCALE}. 6013 * 6014 * @attr ref android.R.styleable#View_layoutDirection 6015 * 6016 * @hide 6017 */ 6018 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6019 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 6020 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 6021 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 6022 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 6023 }) 6024 public int getRawLayoutDirection() { 6025 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 6026 } 6027 6028 /** 6029 * Set the layout direction for this view. This will propagate a reset of layout direction 6030 * resolution to the view's children and resolve layout direction for this view. 6031 * 6032 * @param layoutDirection the layout direction to set. Should be one of: 6033 * 6034 * {@link #LAYOUT_DIRECTION_LTR}, 6035 * {@link #LAYOUT_DIRECTION_RTL}, 6036 * {@link #LAYOUT_DIRECTION_INHERIT}, 6037 * {@link #LAYOUT_DIRECTION_LOCALE}. 6038 * 6039 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 6040 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 6041 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 6042 * 6043 * @attr ref android.R.styleable#View_layoutDirection 6044 */ 6045 @RemotableViewMethod 6046 public void setLayoutDirection(int layoutDirection) { 6047 if (getRawLayoutDirection() != layoutDirection) { 6048 // Reset the current layout direction and the resolved one 6049 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 6050 resetRtlProperties(); 6051 // Set the new layout direction (filtered) 6052 mPrivateFlags2 |= 6053 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 6054 // We need to resolve all RTL properties as they all depend on layout direction 6055 resolveRtlPropertiesIfNeeded(); 6056 requestLayout(); 6057 invalidate(true); 6058 } 6059 } 6060 6061 /** 6062 * Returns the resolved layout direction for this view. 6063 * 6064 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6065 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6066 * 6067 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6068 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6069 * 6070 * @attr ref android.R.styleable#View_layoutDirection 6071 */ 6072 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6073 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6074 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6075 }) 6076 public int getLayoutDirection() { 6077 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6078 if (targetSdkVersion < JELLY_BEAN_MR1) { 6079 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6080 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6081 } 6082 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6083 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6084 } 6085 6086 /** 6087 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6088 * layout attribute and/or the inherited value from the parent 6089 * 6090 * @return true if the layout is right-to-left. 6091 * 6092 * @hide 6093 */ 6094 @ViewDebug.ExportedProperty(category = "layout") 6095 public boolean isLayoutRtl() { 6096 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6097 } 6098 6099 /** 6100 * Indicates whether the view is currently tracking transient state that the 6101 * app should not need to concern itself with saving and restoring, but that 6102 * the framework should take special note to preserve when possible. 6103 * 6104 * <p>A view with transient state cannot be trivially rebound from an external 6105 * data source, such as an adapter binding item views in a list. This may be 6106 * because the view is performing an animation, tracking user selection 6107 * of content, or similar.</p> 6108 * 6109 * @return true if the view has transient state 6110 */ 6111 @ViewDebug.ExportedProperty(category = "layout") 6112 public boolean hasTransientState() { 6113 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6114 } 6115 6116 /** 6117 * Set whether this view is currently tracking transient state that the 6118 * framework should attempt to preserve when possible. This flag is reference counted, 6119 * so every call to setHasTransientState(true) should be paired with a later call 6120 * to setHasTransientState(false). 6121 * 6122 * <p>A view with transient state cannot be trivially rebound from an external 6123 * data source, such as an adapter binding item views in a list. This may be 6124 * because the view is performing an animation, tracking user selection 6125 * of content, or similar.</p> 6126 * 6127 * @param hasTransientState true if this view has transient state 6128 */ 6129 public void setHasTransientState(boolean hasTransientState) { 6130 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6131 mTransientStateCount - 1; 6132 if (mTransientStateCount < 0) { 6133 mTransientStateCount = 0; 6134 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6135 "unmatched pair of setHasTransientState calls"); 6136 } else if ((hasTransientState && mTransientStateCount == 1) || 6137 (!hasTransientState && mTransientStateCount == 0)) { 6138 // update flag if we've just incremented up from 0 or decremented down to 0 6139 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6140 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6141 if (mParent != null) { 6142 try { 6143 mParent.childHasTransientStateChanged(this, hasTransientState); 6144 } catch (AbstractMethodError e) { 6145 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6146 " does not fully implement ViewParent", e); 6147 } 6148 } 6149 } 6150 } 6151 6152 /** 6153 * Returns true if this view is currently attached to a window. 6154 */ 6155 public boolean isAttachedToWindow() { 6156 return mAttachInfo != null; 6157 } 6158 6159 /** 6160 * Returns true if this view has been through at least one layout since it 6161 * was last attached to or detached from a window. 6162 */ 6163 public boolean isLaidOut() { 6164 return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT; 6165 } 6166 6167 /** 6168 * If this view doesn't do any drawing on its own, set this flag to 6169 * allow further optimizations. By default, this flag is not set on 6170 * View, but could be set on some View subclasses such as ViewGroup. 6171 * 6172 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6173 * you should clear this flag. 6174 * 6175 * @param willNotDraw whether or not this View draw on its own 6176 */ 6177 public void setWillNotDraw(boolean willNotDraw) { 6178 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6179 } 6180 6181 /** 6182 * Returns whether or not this View draws on its own. 6183 * 6184 * @return true if this view has nothing to draw, false otherwise 6185 */ 6186 @ViewDebug.ExportedProperty(category = "drawing") 6187 public boolean willNotDraw() { 6188 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 6189 } 6190 6191 /** 6192 * When a View's drawing cache is enabled, drawing is redirected to an 6193 * offscreen bitmap. Some views, like an ImageView, must be able to 6194 * bypass this mechanism if they already draw a single bitmap, to avoid 6195 * unnecessary usage of the memory. 6196 * 6197 * @param willNotCacheDrawing true if this view does not cache its 6198 * drawing, false otherwise 6199 */ 6200 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6201 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6202 } 6203 6204 /** 6205 * Returns whether or not this View can cache its drawing or not. 6206 * 6207 * @return true if this view does not cache its drawing, false otherwise 6208 */ 6209 @ViewDebug.ExportedProperty(category = "drawing") 6210 public boolean willNotCacheDrawing() { 6211 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6212 } 6213 6214 /** 6215 * Indicates whether this view reacts to click events or not. 6216 * 6217 * @return true if the view is clickable, false otherwise 6218 * 6219 * @see #setClickable(boolean) 6220 * @attr ref android.R.styleable#View_clickable 6221 */ 6222 @ViewDebug.ExportedProperty 6223 public boolean isClickable() { 6224 return (mViewFlags & CLICKABLE) == CLICKABLE; 6225 } 6226 6227 /** 6228 * Enables or disables click events for this view. When a view 6229 * is clickable it will change its state to "pressed" on every click. 6230 * Subclasses should set the view clickable to visually react to 6231 * user's clicks. 6232 * 6233 * @param clickable true to make the view clickable, false otherwise 6234 * 6235 * @see #isClickable() 6236 * @attr ref android.R.styleable#View_clickable 6237 */ 6238 public void setClickable(boolean clickable) { 6239 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6240 } 6241 6242 /** 6243 * Indicates whether this view reacts to long click events or not. 6244 * 6245 * @return true if the view is long clickable, false otherwise 6246 * 6247 * @see #setLongClickable(boolean) 6248 * @attr ref android.R.styleable#View_longClickable 6249 */ 6250 public boolean isLongClickable() { 6251 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6252 } 6253 6254 /** 6255 * Enables or disables long click events for this view. When a view is long 6256 * clickable it reacts to the user holding down the button for a longer 6257 * duration than a tap. This event can either launch the listener or a 6258 * context menu. 6259 * 6260 * @param longClickable true to make the view long clickable, false otherwise 6261 * @see #isLongClickable() 6262 * @attr ref android.R.styleable#View_longClickable 6263 */ 6264 public void setLongClickable(boolean longClickable) { 6265 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6266 } 6267 6268 /** 6269 * Sets the pressed state for this view. 6270 * 6271 * @see #isClickable() 6272 * @see #setClickable(boolean) 6273 * 6274 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6275 * the View's internal state from a previously set "pressed" state. 6276 */ 6277 public void setPressed(boolean pressed) { 6278 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6279 6280 if (pressed) { 6281 mPrivateFlags |= PFLAG_PRESSED; 6282 } else { 6283 mPrivateFlags &= ~PFLAG_PRESSED; 6284 } 6285 6286 if (needsRefresh) { 6287 refreshDrawableState(); 6288 } 6289 dispatchSetPressed(pressed); 6290 } 6291 6292 /** 6293 * Dispatch setPressed to all of this View's children. 6294 * 6295 * @see #setPressed(boolean) 6296 * 6297 * @param pressed The new pressed state 6298 */ 6299 protected void dispatchSetPressed(boolean pressed) { 6300 } 6301 6302 /** 6303 * Indicates whether the view is currently in pressed state. Unless 6304 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6305 * the pressed state. 6306 * 6307 * @see #setPressed(boolean) 6308 * @see #isClickable() 6309 * @see #setClickable(boolean) 6310 * 6311 * @return true if the view is currently pressed, false otherwise 6312 */ 6313 public boolean isPressed() { 6314 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6315 } 6316 6317 /** 6318 * Indicates whether this view will save its state (that is, 6319 * whether its {@link #onSaveInstanceState} method will be called). 6320 * 6321 * @return Returns true if the view state saving is enabled, else false. 6322 * 6323 * @see #setSaveEnabled(boolean) 6324 * @attr ref android.R.styleable#View_saveEnabled 6325 */ 6326 public boolean isSaveEnabled() { 6327 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6328 } 6329 6330 /** 6331 * Controls whether the saving of this view's state is 6332 * enabled (that is, whether its {@link #onSaveInstanceState} method 6333 * will be called). Note that even if freezing is enabled, the 6334 * view still must have an id assigned to it (via {@link #setId(int)}) 6335 * for its state to be saved. This flag can only disable the 6336 * saving of this view; any child views may still have their state saved. 6337 * 6338 * @param enabled Set to false to <em>disable</em> state saving, or true 6339 * (the default) to allow it. 6340 * 6341 * @see #isSaveEnabled() 6342 * @see #setId(int) 6343 * @see #onSaveInstanceState() 6344 * @attr ref android.R.styleable#View_saveEnabled 6345 */ 6346 public void setSaveEnabled(boolean enabled) { 6347 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6348 } 6349 6350 /** 6351 * Gets whether the framework should discard touches when the view's 6352 * window is obscured by another visible window. 6353 * Refer to the {@link View} security documentation for more details. 6354 * 6355 * @return True if touch filtering is enabled. 6356 * 6357 * @see #setFilterTouchesWhenObscured(boolean) 6358 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6359 */ 6360 @ViewDebug.ExportedProperty 6361 public boolean getFilterTouchesWhenObscured() { 6362 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6363 } 6364 6365 /** 6366 * Sets whether the framework should discard touches when the view's 6367 * window is obscured by another visible window. 6368 * Refer to the {@link View} security documentation for more details. 6369 * 6370 * @param enabled True if touch filtering should be enabled. 6371 * 6372 * @see #getFilterTouchesWhenObscured 6373 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6374 */ 6375 public void setFilterTouchesWhenObscured(boolean enabled) { 6376 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6377 FILTER_TOUCHES_WHEN_OBSCURED); 6378 } 6379 6380 /** 6381 * Indicates whether the entire hierarchy under this view will save its 6382 * state when a state saving traversal occurs from its parent. The default 6383 * is true; if false, these views will not be saved unless 6384 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6385 * 6386 * @return Returns true if the view state saving from parent is enabled, else false. 6387 * 6388 * @see #setSaveFromParentEnabled(boolean) 6389 */ 6390 public boolean isSaveFromParentEnabled() { 6391 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6392 } 6393 6394 /** 6395 * Controls whether the entire hierarchy under this view will save its 6396 * state when a state saving traversal occurs from its parent. The default 6397 * is true; if false, these views will not be saved unless 6398 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6399 * 6400 * @param enabled Set to false to <em>disable</em> state saving, or true 6401 * (the default) to allow it. 6402 * 6403 * @see #isSaveFromParentEnabled() 6404 * @see #setId(int) 6405 * @see #onSaveInstanceState() 6406 */ 6407 public void setSaveFromParentEnabled(boolean enabled) { 6408 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6409 } 6410 6411 6412 /** 6413 * Returns whether this View is able to take focus. 6414 * 6415 * @return True if this view can take focus, or false otherwise. 6416 * @attr ref android.R.styleable#View_focusable 6417 */ 6418 @ViewDebug.ExportedProperty(category = "focus") 6419 public final boolean isFocusable() { 6420 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6421 } 6422 6423 /** 6424 * When a view is focusable, it may not want to take focus when in touch mode. 6425 * For example, a button would like focus when the user is navigating via a D-pad 6426 * so that the user can click on it, but once the user starts touching the screen, 6427 * the button shouldn't take focus 6428 * @return Whether the view is focusable in touch mode. 6429 * @attr ref android.R.styleable#View_focusableInTouchMode 6430 */ 6431 @ViewDebug.ExportedProperty 6432 public final boolean isFocusableInTouchMode() { 6433 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6434 } 6435 6436 /** 6437 * Find the nearest view in the specified direction that can take focus. 6438 * This does not actually give focus to that view. 6439 * 6440 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6441 * 6442 * @return The nearest focusable in the specified direction, or null if none 6443 * can be found. 6444 */ 6445 public View focusSearch(int direction) { 6446 if (mParent != null) { 6447 return mParent.focusSearch(this, direction); 6448 } else { 6449 return null; 6450 } 6451 } 6452 6453 /** 6454 * This method is the last chance for the focused view and its ancestors to 6455 * respond to an arrow key. This is called when the focused view did not 6456 * consume the key internally, nor could the view system find a new view in 6457 * the requested direction to give focus to. 6458 * 6459 * @param focused The currently focused view. 6460 * @param direction The direction focus wants to move. One of FOCUS_UP, 6461 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6462 * @return True if the this view consumed this unhandled move. 6463 */ 6464 public boolean dispatchUnhandledMove(View focused, int direction) { 6465 return false; 6466 } 6467 6468 /** 6469 * If a user manually specified the next view id for a particular direction, 6470 * use the root to look up the view. 6471 * @param root The root view of the hierarchy containing this view. 6472 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6473 * or FOCUS_BACKWARD. 6474 * @return The user specified next view, or null if there is none. 6475 */ 6476 View findUserSetNextFocus(View root, int direction) { 6477 switch (direction) { 6478 case FOCUS_LEFT: 6479 if (mNextFocusLeftId == View.NO_ID) return null; 6480 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6481 case FOCUS_RIGHT: 6482 if (mNextFocusRightId == View.NO_ID) return null; 6483 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6484 case FOCUS_UP: 6485 if (mNextFocusUpId == View.NO_ID) return null; 6486 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6487 case FOCUS_DOWN: 6488 if (mNextFocusDownId == View.NO_ID) return null; 6489 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6490 case FOCUS_FORWARD: 6491 if (mNextFocusForwardId == View.NO_ID) return null; 6492 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6493 case FOCUS_BACKWARD: { 6494 if (mID == View.NO_ID) return null; 6495 final int id = mID; 6496 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6497 @Override 6498 public boolean apply(View t) { 6499 return t.mNextFocusForwardId == id; 6500 } 6501 }); 6502 } 6503 } 6504 return null; 6505 } 6506 6507 private View findViewInsideOutShouldExist(View root, int id) { 6508 if (mMatchIdPredicate == null) { 6509 mMatchIdPredicate = new MatchIdPredicate(); 6510 } 6511 mMatchIdPredicate.mId = id; 6512 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6513 if (result == null) { 6514 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6515 } 6516 return result; 6517 } 6518 6519 /** 6520 * Find and return all focusable views that are descendants of this view, 6521 * possibly including this view if it is focusable itself. 6522 * 6523 * @param direction The direction of the focus 6524 * @return A list of focusable views 6525 */ 6526 public ArrayList<View> getFocusables(int direction) { 6527 ArrayList<View> result = new ArrayList<View>(24); 6528 addFocusables(result, direction); 6529 return result; 6530 } 6531 6532 /** 6533 * Add any focusable views that are descendants of this view (possibly 6534 * including this view if it is focusable itself) to views. If we are in touch mode, 6535 * only add views that are also focusable in touch mode. 6536 * 6537 * @param views Focusable views found so far 6538 * @param direction The direction of the focus 6539 */ 6540 public void addFocusables(ArrayList<View> views, int direction) { 6541 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6542 } 6543 6544 /** 6545 * Adds any focusable views that are descendants of this view (possibly 6546 * including this view if it is focusable itself) to views. This method 6547 * adds all focusable views regardless if we are in touch mode or 6548 * only views focusable in touch mode if we are in touch mode or 6549 * only views that can take accessibility focus if accessibility is enabeld 6550 * depending on the focusable mode paramater. 6551 * 6552 * @param views Focusable views found so far or null if all we are interested is 6553 * the number of focusables. 6554 * @param direction The direction of the focus. 6555 * @param focusableMode The type of focusables to be added. 6556 * 6557 * @see #FOCUSABLES_ALL 6558 * @see #FOCUSABLES_TOUCH_MODE 6559 */ 6560 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6561 if (views == null) { 6562 return; 6563 } 6564 if (!isFocusable()) { 6565 return; 6566 } 6567 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6568 && isInTouchMode() && !isFocusableInTouchMode()) { 6569 return; 6570 } 6571 views.add(this); 6572 } 6573 6574 /** 6575 * Finds the Views that contain given text. The containment is case insensitive. 6576 * The search is performed by either the text that the View renders or the content 6577 * description that describes the view for accessibility purposes and the view does 6578 * not render or both. Clients can specify how the search is to be performed via 6579 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6580 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6581 * 6582 * @param outViews The output list of matching Views. 6583 * @param searched The text to match against. 6584 * 6585 * @see #FIND_VIEWS_WITH_TEXT 6586 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6587 * @see #setContentDescription(CharSequence) 6588 */ 6589 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6590 if (getAccessibilityNodeProvider() != null) { 6591 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6592 outViews.add(this); 6593 } 6594 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6595 && (searched != null && searched.length() > 0) 6596 && (mContentDescription != null && mContentDescription.length() > 0)) { 6597 String searchedLowerCase = searched.toString().toLowerCase(); 6598 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6599 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6600 outViews.add(this); 6601 } 6602 } 6603 } 6604 6605 /** 6606 * Find and return all touchable views that are descendants of this view, 6607 * possibly including this view if it is touchable itself. 6608 * 6609 * @return A list of touchable views 6610 */ 6611 public ArrayList<View> getTouchables() { 6612 ArrayList<View> result = new ArrayList<View>(); 6613 addTouchables(result); 6614 return result; 6615 } 6616 6617 /** 6618 * Add any touchable views that are descendants of this view (possibly 6619 * including this view if it is touchable itself) to views. 6620 * 6621 * @param views Touchable views found so far 6622 */ 6623 public void addTouchables(ArrayList<View> views) { 6624 final int viewFlags = mViewFlags; 6625 6626 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6627 && (viewFlags & ENABLED_MASK) == ENABLED) { 6628 views.add(this); 6629 } 6630 } 6631 6632 /** 6633 * Returns whether this View is accessibility focused. 6634 * 6635 * @return True if this View is accessibility focused. 6636 */ 6637 boolean isAccessibilityFocused() { 6638 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6639 } 6640 6641 /** 6642 * Call this to try to give accessibility focus to this view. 6643 * 6644 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6645 * returns false or the view is no visible or the view already has accessibility 6646 * focus. 6647 * 6648 * See also {@link #focusSearch(int)}, which is what you call to say that you 6649 * have focus, and you want your parent to look for the next one. 6650 * 6651 * @return Whether this view actually took accessibility focus. 6652 * 6653 * @hide 6654 */ 6655 public boolean requestAccessibilityFocus() { 6656 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6657 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6658 return false; 6659 } 6660 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6661 return false; 6662 } 6663 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6664 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6665 ViewRootImpl viewRootImpl = getViewRootImpl(); 6666 if (viewRootImpl != null) { 6667 viewRootImpl.setAccessibilityFocus(this, null); 6668 } 6669 invalidate(); 6670 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6671 return true; 6672 } 6673 return false; 6674 } 6675 6676 /** 6677 * Call this to try to clear accessibility focus of this view. 6678 * 6679 * See also {@link #focusSearch(int)}, which is what you call to say that you 6680 * have focus, and you want your parent to look for the next one. 6681 * 6682 * @hide 6683 */ 6684 public void clearAccessibilityFocus() { 6685 clearAccessibilityFocusNoCallbacks(); 6686 // Clear the global reference of accessibility focus if this 6687 // view or any of its descendants had accessibility focus. 6688 ViewRootImpl viewRootImpl = getViewRootImpl(); 6689 if (viewRootImpl != null) { 6690 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6691 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6692 viewRootImpl.setAccessibilityFocus(null, null); 6693 } 6694 } 6695 } 6696 6697 private void sendAccessibilityHoverEvent(int eventType) { 6698 // Since we are not delivering to a client accessibility events from not 6699 // important views (unless the clinet request that) we need to fire the 6700 // event from the deepest view exposed to the client. As a consequence if 6701 // the user crosses a not exposed view the client will see enter and exit 6702 // of the exposed predecessor followed by and enter and exit of that same 6703 // predecessor when entering and exiting the not exposed descendant. This 6704 // is fine since the client has a clear idea which view is hovered at the 6705 // price of a couple more events being sent. This is a simple and 6706 // working solution. 6707 View source = this; 6708 while (true) { 6709 if (source.includeForAccessibility()) { 6710 source.sendAccessibilityEvent(eventType); 6711 return; 6712 } 6713 ViewParent parent = source.getParent(); 6714 if (parent instanceof View) { 6715 source = (View) parent; 6716 } else { 6717 return; 6718 } 6719 } 6720 } 6721 6722 /** 6723 * Clears accessibility focus without calling any callback methods 6724 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6725 * is used for clearing accessibility focus when giving this focus to 6726 * another view. 6727 */ 6728 void clearAccessibilityFocusNoCallbacks() { 6729 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6730 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6731 invalidate(); 6732 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6733 } 6734 } 6735 6736 /** 6737 * Call this to try to give focus to a specific view or to one of its 6738 * descendants. 6739 * 6740 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6741 * false), or if it is focusable and it is not focusable in touch mode 6742 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6743 * 6744 * See also {@link #focusSearch(int)}, which is what you call to say that you 6745 * have focus, and you want your parent to look for the next one. 6746 * 6747 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6748 * {@link #FOCUS_DOWN} and <code>null</code>. 6749 * 6750 * @return Whether this view or one of its descendants actually took focus. 6751 */ 6752 public final boolean requestFocus() { 6753 return requestFocus(View.FOCUS_DOWN); 6754 } 6755 6756 /** 6757 * Call this to try to give focus to a specific view or to one of its 6758 * descendants and give it a hint about what direction focus is heading. 6759 * 6760 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6761 * false), or if it is focusable and it is not focusable in touch mode 6762 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6763 * 6764 * See also {@link #focusSearch(int)}, which is what you call to say that you 6765 * have focus, and you want your parent to look for the next one. 6766 * 6767 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6768 * <code>null</code> set for the previously focused rectangle. 6769 * 6770 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6771 * @return Whether this view or one of its descendants actually took focus. 6772 */ 6773 public final boolean requestFocus(int direction) { 6774 return requestFocus(direction, null); 6775 } 6776 6777 /** 6778 * Call this to try to give focus to a specific view or to one of its descendants 6779 * and give it hints about the direction and a specific rectangle that the focus 6780 * is coming from. The rectangle can help give larger views a finer grained hint 6781 * about where focus is coming from, and therefore, where to show selection, or 6782 * forward focus change internally. 6783 * 6784 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6785 * false), or if it is focusable and it is not focusable in touch mode 6786 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6787 * 6788 * A View will not take focus if it is not visible. 6789 * 6790 * A View will not take focus if one of its parents has 6791 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6792 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6793 * 6794 * See also {@link #focusSearch(int)}, which is what you call to say that you 6795 * have focus, and you want your parent to look for the next one. 6796 * 6797 * You may wish to override this method if your custom {@link View} has an internal 6798 * {@link View} that it wishes to forward the request to. 6799 * 6800 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6801 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6802 * to give a finer grained hint about where focus is coming from. May be null 6803 * if there is no hint. 6804 * @return Whether this view or one of its descendants actually took focus. 6805 */ 6806 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6807 return requestFocusNoSearch(direction, previouslyFocusedRect); 6808 } 6809 6810 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6811 // need to be focusable 6812 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6813 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6814 return false; 6815 } 6816 6817 // need to be focusable in touch mode if in touch mode 6818 if (isInTouchMode() && 6819 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6820 return false; 6821 } 6822 6823 // need to not have any parents blocking us 6824 if (hasAncestorThatBlocksDescendantFocus()) { 6825 return false; 6826 } 6827 6828 handleFocusGainInternal(direction, previouslyFocusedRect); 6829 return true; 6830 } 6831 6832 /** 6833 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6834 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6835 * touch mode to request focus when they are touched. 6836 * 6837 * @return Whether this view or one of its descendants actually took focus. 6838 * 6839 * @see #isInTouchMode() 6840 * 6841 */ 6842 public final boolean requestFocusFromTouch() { 6843 // Leave touch mode if we need to 6844 if (isInTouchMode()) { 6845 ViewRootImpl viewRoot = getViewRootImpl(); 6846 if (viewRoot != null) { 6847 viewRoot.ensureTouchMode(false); 6848 } 6849 } 6850 return requestFocus(View.FOCUS_DOWN); 6851 } 6852 6853 /** 6854 * @return Whether any ancestor of this view blocks descendant focus. 6855 */ 6856 private boolean hasAncestorThatBlocksDescendantFocus() { 6857 ViewParent ancestor = mParent; 6858 while (ancestor instanceof ViewGroup) { 6859 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6860 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6861 return true; 6862 } else { 6863 ancestor = vgAncestor.getParent(); 6864 } 6865 } 6866 return false; 6867 } 6868 6869 /** 6870 * Gets the mode for determining whether this View is important for accessibility 6871 * which is if it fires accessibility events and if it is reported to 6872 * accessibility services that query the screen. 6873 * 6874 * @return The mode for determining whether a View is important for accessibility. 6875 * 6876 * @attr ref android.R.styleable#View_importantForAccessibility 6877 * 6878 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6879 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6880 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6881 */ 6882 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6883 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6884 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6885 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6886 }) 6887 public int getImportantForAccessibility() { 6888 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6889 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6890 } 6891 6892 /** 6893 * Sets how to determine whether this view is important for accessibility 6894 * which is if it fires accessibility events and if it is reported to 6895 * accessibility services that query the screen. 6896 * 6897 * @param mode How to determine whether this view is important for accessibility. 6898 * 6899 * @attr ref android.R.styleable#View_importantForAccessibility 6900 * 6901 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6902 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6903 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6904 */ 6905 public void setImportantForAccessibility(int mode) { 6906 final boolean oldIncludeForAccessibility = includeForAccessibility(); 6907 if (mode != getImportantForAccessibility()) { 6908 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6909 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6910 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6911 if (oldIncludeForAccessibility != includeForAccessibility()) { 6912 notifySubtreeAccessibilityStateChangedIfNeeded(); 6913 } else { 6914 notifyViewAccessibilityStateChangedIfNeeded(); 6915 } 6916 } 6917 } 6918 6919 /** 6920 * Gets whether this view should be exposed for accessibility. 6921 * 6922 * @return Whether the view is exposed for accessibility. 6923 * 6924 * @hide 6925 */ 6926 public boolean isImportantForAccessibility() { 6927 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6928 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6929 switch (mode) { 6930 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6931 return true; 6932 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6933 return false; 6934 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6935 return isActionableForAccessibility() || hasListenersForAccessibility() 6936 || getAccessibilityNodeProvider() != null; 6937 default: 6938 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6939 + mode); 6940 } 6941 } 6942 6943 /** 6944 * Gets the parent for accessibility purposes. Note that the parent for 6945 * accessibility is not necessary the immediate parent. It is the first 6946 * predecessor that is important for accessibility. 6947 * 6948 * @return The parent for accessibility purposes. 6949 */ 6950 public ViewParent getParentForAccessibility() { 6951 if (mParent instanceof View) { 6952 View parentView = (View) mParent; 6953 if (parentView.includeForAccessibility()) { 6954 return mParent; 6955 } else { 6956 return mParent.getParentForAccessibility(); 6957 } 6958 } 6959 return null; 6960 } 6961 6962 /** 6963 * Adds the children of a given View for accessibility. Since some Views are 6964 * not important for accessibility the children for accessibility are not 6965 * necessarily direct children of the view, rather they are the first level of 6966 * descendants important for accessibility. 6967 * 6968 * @param children The list of children for accessibility. 6969 */ 6970 public void addChildrenForAccessibility(ArrayList<View> children) { 6971 if (includeForAccessibility()) { 6972 children.add(this); 6973 } 6974 } 6975 6976 /** 6977 * Whether to regard this view for accessibility. A view is regarded for 6978 * accessibility if it is important for accessibility or the querying 6979 * accessibility service has explicitly requested that view not 6980 * important for accessibility are regarded. 6981 * 6982 * @return Whether to regard the view for accessibility. 6983 * 6984 * @hide 6985 */ 6986 public boolean includeForAccessibility() { 6987 //noinspection SimplifiableIfStatement 6988 if (mAttachInfo != null) { 6989 return (mAttachInfo.mAccessibilityFetchFlags 6990 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 6991 || isImportantForAccessibility(); 6992 } 6993 return false; 6994 } 6995 6996 /** 6997 * Returns whether the View is considered actionable from 6998 * accessibility perspective. Such view are important for 6999 * accessibility. 7000 * 7001 * @return True if the view is actionable for accessibility. 7002 * 7003 * @hide 7004 */ 7005 public boolean isActionableForAccessibility() { 7006 return (isClickable() || isLongClickable() || isFocusable()); 7007 } 7008 7009 /** 7010 * Returns whether the View has registered callbacks wich makes it 7011 * important for accessibility. 7012 * 7013 * @return True if the view is actionable for accessibility. 7014 */ 7015 private boolean hasListenersForAccessibility() { 7016 ListenerInfo info = getListenerInfo(); 7017 return mTouchDelegate != null || info.mOnKeyListener != null 7018 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 7019 || info.mOnHoverListener != null || info.mOnDragListener != null; 7020 } 7021 7022 /** 7023 * Notifies that the accessibility state of this view changed. The change 7024 * is local to this view and does not represent structural changes such 7025 * as children and parent. For example, the view became focusable. The 7026 * notification is at at most once every 7027 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7028 * to avoid unnecessary load to the system. Also once a view has a pending 7029 * notifucation this method is a NOP until the notification has been sent. 7030 * 7031 * @hide 7032 */ 7033 public void notifyViewAccessibilityStateChangedIfNeeded() { 7034 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7035 return; 7036 } 7037 if (mSendViewStateChangedAccessibilityEvent == null) { 7038 mSendViewStateChangedAccessibilityEvent = 7039 new SendViewStateChangedAccessibilityEvent(); 7040 } 7041 mSendViewStateChangedAccessibilityEvent.runOrPost(); 7042 } 7043 7044 /** 7045 * Notifies that the accessibility state of this view changed. The change 7046 * is *not* local to this view and does represent structural changes such 7047 * as children and parent. For example, the view size changed. The 7048 * notification is at at most once every 7049 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7050 * to avoid unnecessary load to the system. Also once a view has a pending 7051 * notifucation this method is a NOP until the notification has been sent. 7052 * 7053 * @hide 7054 */ 7055 public void notifySubtreeAccessibilityStateChangedIfNeeded() { 7056 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7057 return; 7058 } 7059 if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) { 7060 mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7061 if (mParent != null) { 7062 try { 7063 mParent.childAccessibilityStateChanged(this); 7064 } catch (AbstractMethodError e) { 7065 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 7066 " does not fully implement ViewParent", e); 7067 } 7068 } 7069 } 7070 } 7071 7072 /** 7073 * Reset the flag indicating the accessibility state of the subtree rooted 7074 * at this view changed. 7075 */ 7076 void resetSubtreeAccessibilityStateChanged() { 7077 mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7078 } 7079 7080 /** 7081 * Performs the specified accessibility action on the view. For 7082 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 7083 * <p> 7084 * If an {@link AccessibilityDelegate} has been specified via calling 7085 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 7086 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 7087 * is responsible for handling this call. 7088 * </p> 7089 * 7090 * @param action The action to perform. 7091 * @param arguments Optional action arguments. 7092 * @return Whether the action was performed. 7093 */ 7094 public boolean performAccessibilityAction(int action, Bundle arguments) { 7095 if (mAccessibilityDelegate != null) { 7096 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 7097 } else { 7098 return performAccessibilityActionInternal(action, arguments); 7099 } 7100 } 7101 7102 /** 7103 * @see #performAccessibilityAction(int, Bundle) 7104 * 7105 * Note: Called from the default {@link AccessibilityDelegate}. 7106 */ 7107 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 7108 switch (action) { 7109 case AccessibilityNodeInfo.ACTION_CLICK: { 7110 if (isClickable()) { 7111 performClick(); 7112 return true; 7113 } 7114 } break; 7115 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 7116 if (isLongClickable()) { 7117 performLongClick(); 7118 return true; 7119 } 7120 } break; 7121 case AccessibilityNodeInfo.ACTION_FOCUS: { 7122 if (!hasFocus()) { 7123 // Get out of touch mode since accessibility 7124 // wants to move focus around. 7125 getViewRootImpl().ensureTouchMode(false); 7126 return requestFocus(); 7127 } 7128 } break; 7129 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 7130 if (hasFocus()) { 7131 clearFocus(); 7132 return !isFocused(); 7133 } 7134 } break; 7135 case AccessibilityNodeInfo.ACTION_SELECT: { 7136 if (!isSelected()) { 7137 setSelected(true); 7138 return isSelected(); 7139 } 7140 } break; 7141 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 7142 if (isSelected()) { 7143 setSelected(false); 7144 return !isSelected(); 7145 } 7146 } break; 7147 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 7148 if (!isAccessibilityFocused()) { 7149 return requestAccessibilityFocus(); 7150 } 7151 } break; 7152 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 7153 if (isAccessibilityFocused()) { 7154 clearAccessibilityFocus(); 7155 return true; 7156 } 7157 } break; 7158 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 7159 if (arguments != null) { 7160 final int granularity = arguments.getInt( 7161 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7162 final boolean extendSelection = arguments.getBoolean( 7163 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7164 return traverseAtGranularity(granularity, true, extendSelection); 7165 } 7166 } break; 7167 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 7168 if (arguments != null) { 7169 final int granularity = arguments.getInt( 7170 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7171 final boolean extendSelection = arguments.getBoolean( 7172 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7173 return traverseAtGranularity(granularity, false, extendSelection); 7174 } 7175 } break; 7176 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 7177 CharSequence text = getIterableTextForAccessibility(); 7178 if (text == null) { 7179 return false; 7180 } 7181 final int start = (arguments != null) ? arguments.getInt( 7182 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 7183 final int end = (arguments != null) ? arguments.getInt( 7184 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 7185 // Only cursor position can be specified (selection length == 0) 7186 if ((getAccessibilitySelectionStart() != start 7187 || getAccessibilitySelectionEnd() != end) 7188 && (start == end)) { 7189 setAccessibilitySelection(start, end); 7190 notifyViewAccessibilityStateChangedIfNeeded(); 7191 return true; 7192 } 7193 } break; 7194 } 7195 return false; 7196 } 7197 7198 private boolean traverseAtGranularity(int granularity, boolean forward, 7199 boolean extendSelection) { 7200 CharSequence text = getIterableTextForAccessibility(); 7201 if (text == null || text.length() == 0) { 7202 return false; 7203 } 7204 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7205 if (iterator == null) { 7206 return false; 7207 } 7208 int current = getAccessibilitySelectionEnd(); 7209 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7210 current = forward ? 0 : text.length(); 7211 } 7212 final int[] range = forward ? iterator.following(current) : iterator.preceding(current); 7213 if (range == null) { 7214 return false; 7215 } 7216 final int segmentStart = range[0]; 7217 final int segmentEnd = range[1]; 7218 int selectionStart; 7219 int selectionEnd; 7220 if (extendSelection && isAccessibilitySelectionExtendable()) { 7221 selectionStart = getAccessibilitySelectionStart(); 7222 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7223 selectionStart = forward ? segmentStart : segmentEnd; 7224 } 7225 selectionEnd = forward ? segmentEnd : segmentStart; 7226 } else { 7227 selectionStart = selectionEnd= forward ? segmentEnd : segmentStart; 7228 } 7229 setAccessibilitySelection(selectionStart, selectionEnd); 7230 final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY 7231 : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY; 7232 sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd); 7233 return true; 7234 } 7235 7236 /** 7237 * Gets the text reported for accessibility purposes. 7238 * 7239 * @return The accessibility text. 7240 * 7241 * @hide 7242 */ 7243 public CharSequence getIterableTextForAccessibility() { 7244 return getContentDescription(); 7245 } 7246 7247 /** 7248 * Gets whether accessibility selection can be extended. 7249 * 7250 * @return If selection is extensible. 7251 * 7252 * @hide 7253 */ 7254 public boolean isAccessibilitySelectionExtendable() { 7255 return false; 7256 } 7257 7258 /** 7259 * @hide 7260 */ 7261 public int getAccessibilitySelectionStart() { 7262 return mAccessibilityCursorPosition; 7263 } 7264 7265 /** 7266 * @hide 7267 */ 7268 public int getAccessibilitySelectionEnd() { 7269 return getAccessibilitySelectionStart(); 7270 } 7271 7272 /** 7273 * @hide 7274 */ 7275 public void setAccessibilitySelection(int start, int end) { 7276 if (start == end && end == mAccessibilityCursorPosition) { 7277 return; 7278 } 7279 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 7280 mAccessibilityCursorPosition = start; 7281 } else { 7282 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 7283 } 7284 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 7285 } 7286 7287 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7288 int fromIndex, int toIndex) { 7289 if (mParent == null) { 7290 return; 7291 } 7292 AccessibilityEvent event = AccessibilityEvent.obtain( 7293 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7294 onInitializeAccessibilityEvent(event); 7295 onPopulateAccessibilityEvent(event); 7296 event.setFromIndex(fromIndex); 7297 event.setToIndex(toIndex); 7298 event.setAction(action); 7299 event.setMovementGranularity(granularity); 7300 mParent.requestSendAccessibilityEvent(this, event); 7301 } 7302 7303 /** 7304 * @hide 7305 */ 7306 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7307 switch (granularity) { 7308 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7309 CharSequence text = getIterableTextForAccessibility(); 7310 if (text != null && text.length() > 0) { 7311 CharacterTextSegmentIterator iterator = 7312 CharacterTextSegmentIterator.getInstance( 7313 mContext.getResources().getConfiguration().locale); 7314 iterator.initialize(text.toString()); 7315 return iterator; 7316 } 7317 } break; 7318 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7319 CharSequence text = getIterableTextForAccessibility(); 7320 if (text != null && text.length() > 0) { 7321 WordTextSegmentIterator iterator = 7322 WordTextSegmentIterator.getInstance( 7323 mContext.getResources().getConfiguration().locale); 7324 iterator.initialize(text.toString()); 7325 return iterator; 7326 } 7327 } break; 7328 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7329 CharSequence text = getIterableTextForAccessibility(); 7330 if (text != null && text.length() > 0) { 7331 ParagraphTextSegmentIterator iterator = 7332 ParagraphTextSegmentIterator.getInstance(); 7333 iterator.initialize(text.toString()); 7334 return iterator; 7335 } 7336 } break; 7337 } 7338 return null; 7339 } 7340 7341 /** 7342 * @hide 7343 */ 7344 public void dispatchStartTemporaryDetach() { 7345 clearAccessibilityFocus(); 7346 clearDisplayList(); 7347 7348 onStartTemporaryDetach(); 7349 } 7350 7351 /** 7352 * This is called when a container is going to temporarily detach a child, with 7353 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7354 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7355 * {@link #onDetachedFromWindow()} when the container is done. 7356 */ 7357 public void onStartTemporaryDetach() { 7358 removeUnsetPressCallback(); 7359 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7360 } 7361 7362 /** 7363 * @hide 7364 */ 7365 public void dispatchFinishTemporaryDetach() { 7366 onFinishTemporaryDetach(); 7367 } 7368 7369 /** 7370 * Called after {@link #onStartTemporaryDetach} when the container is done 7371 * changing the view. 7372 */ 7373 public void onFinishTemporaryDetach() { 7374 } 7375 7376 /** 7377 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7378 * for this view's window. Returns null if the view is not currently attached 7379 * to the window. Normally you will not need to use this directly, but 7380 * just use the standard high-level event callbacks like 7381 * {@link #onKeyDown(int, KeyEvent)}. 7382 */ 7383 public KeyEvent.DispatcherState getKeyDispatcherState() { 7384 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7385 } 7386 7387 /** 7388 * Dispatch a key event before it is processed by any input method 7389 * associated with the view hierarchy. This can be used to intercept 7390 * key events in special situations before the IME consumes them; a 7391 * typical example would be handling the BACK key to update the application's 7392 * UI instead of allowing the IME to see it and close itself. 7393 * 7394 * @param event The key event to be dispatched. 7395 * @return True if the event was handled, false otherwise. 7396 */ 7397 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7398 return onKeyPreIme(event.getKeyCode(), event); 7399 } 7400 7401 /** 7402 * Dispatch a key event to the next view on the focus path. This path runs 7403 * from the top of the view tree down to the currently focused view. If this 7404 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7405 * the next node down the focus path. This method also fires any key 7406 * listeners. 7407 * 7408 * @param event The key event to be dispatched. 7409 * @return True if the event was handled, false otherwise. 7410 */ 7411 public boolean dispatchKeyEvent(KeyEvent event) { 7412 if (mInputEventConsistencyVerifier != null) { 7413 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7414 } 7415 7416 // Give any attached key listener a first crack at the event. 7417 //noinspection SimplifiableIfStatement 7418 ListenerInfo li = mListenerInfo; 7419 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7420 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7421 return true; 7422 } 7423 7424 if (event.dispatch(this, mAttachInfo != null 7425 ? mAttachInfo.mKeyDispatchState : null, this)) { 7426 return true; 7427 } 7428 7429 if (mInputEventConsistencyVerifier != null) { 7430 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7431 } 7432 return false; 7433 } 7434 7435 /** 7436 * Dispatches a key shortcut event. 7437 * 7438 * @param event The key event to be dispatched. 7439 * @return True if the event was handled by the view, false otherwise. 7440 */ 7441 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7442 return onKeyShortcut(event.getKeyCode(), event); 7443 } 7444 7445 /** 7446 * Pass the touch screen motion event down to the target view, or this 7447 * view if it is the target. 7448 * 7449 * @param event The motion event to be dispatched. 7450 * @return True if the event was handled by the view, false otherwise. 7451 */ 7452 public boolean dispatchTouchEvent(MotionEvent event) { 7453 if (mInputEventConsistencyVerifier != null) { 7454 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7455 } 7456 7457 if (onFilterTouchEventForSecurity(event)) { 7458 //noinspection SimplifiableIfStatement 7459 ListenerInfo li = mListenerInfo; 7460 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7461 && li.mOnTouchListener.onTouch(this, event)) { 7462 return true; 7463 } 7464 7465 if (onTouchEvent(event)) { 7466 return true; 7467 } 7468 } 7469 7470 if (mInputEventConsistencyVerifier != null) { 7471 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7472 } 7473 return false; 7474 } 7475 7476 /** 7477 * Filter the touch event to apply security policies. 7478 * 7479 * @param event The motion event to be filtered. 7480 * @return True if the event should be dispatched, false if the event should be dropped. 7481 * 7482 * @see #getFilterTouchesWhenObscured 7483 */ 7484 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7485 //noinspection RedundantIfStatement 7486 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7487 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7488 // Window is obscured, drop this touch. 7489 return false; 7490 } 7491 return true; 7492 } 7493 7494 /** 7495 * Pass a trackball motion event down to the focused view. 7496 * 7497 * @param event The motion event to be dispatched. 7498 * @return True if the event was handled by the view, false otherwise. 7499 */ 7500 public boolean dispatchTrackballEvent(MotionEvent event) { 7501 if (mInputEventConsistencyVerifier != null) { 7502 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7503 } 7504 7505 return onTrackballEvent(event); 7506 } 7507 7508 /** 7509 * Dispatch a generic motion event. 7510 * <p> 7511 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7512 * are delivered to the view under the pointer. All other generic motion events are 7513 * delivered to the focused view. Hover events are handled specially and are delivered 7514 * to {@link #onHoverEvent(MotionEvent)}. 7515 * </p> 7516 * 7517 * @param event The motion event to be dispatched. 7518 * @return True if the event was handled by the view, false otherwise. 7519 */ 7520 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7521 if (mInputEventConsistencyVerifier != null) { 7522 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7523 } 7524 7525 final int source = event.getSource(); 7526 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7527 final int action = event.getAction(); 7528 if (action == MotionEvent.ACTION_HOVER_ENTER 7529 || action == MotionEvent.ACTION_HOVER_MOVE 7530 || action == MotionEvent.ACTION_HOVER_EXIT) { 7531 if (dispatchHoverEvent(event)) { 7532 return true; 7533 } 7534 } else if (dispatchGenericPointerEvent(event)) { 7535 return true; 7536 } 7537 } else if (dispatchGenericFocusedEvent(event)) { 7538 return true; 7539 } 7540 7541 if (dispatchGenericMotionEventInternal(event)) { 7542 return true; 7543 } 7544 7545 if (mInputEventConsistencyVerifier != null) { 7546 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7547 } 7548 return false; 7549 } 7550 7551 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7552 //noinspection SimplifiableIfStatement 7553 ListenerInfo li = mListenerInfo; 7554 if (li != null && li.mOnGenericMotionListener != null 7555 && (mViewFlags & ENABLED_MASK) == ENABLED 7556 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7557 return true; 7558 } 7559 7560 if (onGenericMotionEvent(event)) { 7561 return true; 7562 } 7563 7564 if (mInputEventConsistencyVerifier != null) { 7565 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7566 } 7567 return false; 7568 } 7569 7570 /** 7571 * Dispatch a hover event. 7572 * <p> 7573 * Do not call this method directly. 7574 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7575 * </p> 7576 * 7577 * @param event The motion event to be dispatched. 7578 * @return True if the event was handled by the view, false otherwise. 7579 */ 7580 protected boolean dispatchHoverEvent(MotionEvent event) { 7581 ListenerInfo li = mListenerInfo; 7582 //noinspection SimplifiableIfStatement 7583 if (li != null && li.mOnHoverListener != null 7584 && (mViewFlags & ENABLED_MASK) == ENABLED 7585 && li.mOnHoverListener.onHover(this, event)) { 7586 return true; 7587 } 7588 7589 return onHoverEvent(event); 7590 } 7591 7592 /** 7593 * Returns true if the view has a child to which it has recently sent 7594 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7595 * it does not have a hovered child, then it must be the innermost hovered view. 7596 * @hide 7597 */ 7598 protected boolean hasHoveredChild() { 7599 return false; 7600 } 7601 7602 /** 7603 * Dispatch a generic motion event to the view under the first pointer. 7604 * <p> 7605 * Do not call this method directly. 7606 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7607 * </p> 7608 * 7609 * @param event The motion event to be dispatched. 7610 * @return True if the event was handled by the view, false otherwise. 7611 */ 7612 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7613 return false; 7614 } 7615 7616 /** 7617 * Dispatch a generic motion event to the currently focused view. 7618 * <p> 7619 * Do not call this method directly. 7620 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7621 * </p> 7622 * 7623 * @param event The motion event to be dispatched. 7624 * @return True if the event was handled by the view, false otherwise. 7625 */ 7626 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7627 return false; 7628 } 7629 7630 /** 7631 * Dispatch a pointer event. 7632 * <p> 7633 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7634 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7635 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7636 * and should not be expected to handle other pointing device features. 7637 * </p> 7638 * 7639 * @param event The motion event to be dispatched. 7640 * @return True if the event was handled by the view, false otherwise. 7641 * @hide 7642 */ 7643 public final boolean dispatchPointerEvent(MotionEvent event) { 7644 if (event.isTouchEvent()) { 7645 return dispatchTouchEvent(event); 7646 } else { 7647 return dispatchGenericMotionEvent(event); 7648 } 7649 } 7650 7651 /** 7652 * Called when the window containing this view gains or loses window focus. 7653 * ViewGroups should override to route to their children. 7654 * 7655 * @param hasFocus True if the window containing this view now has focus, 7656 * false otherwise. 7657 */ 7658 public void dispatchWindowFocusChanged(boolean hasFocus) { 7659 onWindowFocusChanged(hasFocus); 7660 } 7661 7662 /** 7663 * Called when the window containing this view gains or loses focus. Note 7664 * that this is separate from view focus: to receive key events, both 7665 * your view and its window must have focus. If a window is displayed 7666 * on top of yours that takes input focus, then your own window will lose 7667 * focus but the view focus will remain unchanged. 7668 * 7669 * @param hasWindowFocus True if the window containing this view now has 7670 * focus, false otherwise. 7671 */ 7672 public void onWindowFocusChanged(boolean hasWindowFocus) { 7673 InputMethodManager imm = InputMethodManager.peekInstance(); 7674 if (!hasWindowFocus) { 7675 if (isPressed()) { 7676 setPressed(false); 7677 } 7678 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7679 imm.focusOut(this); 7680 } 7681 removeLongPressCallback(); 7682 removeTapCallback(); 7683 onFocusLost(); 7684 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7685 imm.focusIn(this); 7686 } 7687 refreshDrawableState(); 7688 } 7689 7690 /** 7691 * Returns true if this view is in a window that currently has window focus. 7692 * Note that this is not the same as the view itself having focus. 7693 * 7694 * @return True if this view is in a window that currently has window focus. 7695 */ 7696 public boolean hasWindowFocus() { 7697 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7698 } 7699 7700 /** 7701 * Dispatch a view visibility change down the view hierarchy. 7702 * ViewGroups should override to route to their children. 7703 * @param changedView The view whose visibility changed. Could be 'this' or 7704 * an ancestor view. 7705 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7706 * {@link #INVISIBLE} or {@link #GONE}. 7707 */ 7708 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7709 onVisibilityChanged(changedView, visibility); 7710 } 7711 7712 /** 7713 * Called when the visibility of the view or an ancestor of the view is changed. 7714 * @param changedView The view whose visibility changed. Could be 'this' or 7715 * an ancestor view. 7716 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7717 * {@link #INVISIBLE} or {@link #GONE}. 7718 */ 7719 protected void onVisibilityChanged(View changedView, int visibility) { 7720 if (visibility == VISIBLE) { 7721 if (mAttachInfo != null) { 7722 initialAwakenScrollBars(); 7723 } else { 7724 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7725 } 7726 } 7727 } 7728 7729 /** 7730 * Dispatch a hint about whether this view is displayed. For instance, when 7731 * a View moves out of the screen, it might receives a display hint indicating 7732 * the view is not displayed. Applications should not <em>rely</em> on this hint 7733 * as there is no guarantee that they will receive one. 7734 * 7735 * @param hint A hint about whether or not this view is displayed: 7736 * {@link #VISIBLE} or {@link #INVISIBLE}. 7737 */ 7738 public void dispatchDisplayHint(int hint) { 7739 onDisplayHint(hint); 7740 } 7741 7742 /** 7743 * Gives this view a hint about whether is displayed or not. For instance, when 7744 * a View moves out of the screen, it might receives a display hint indicating 7745 * the view is not displayed. Applications should not <em>rely</em> on this hint 7746 * as there is no guarantee that they will receive one. 7747 * 7748 * @param hint A hint about whether or not this view is displayed: 7749 * {@link #VISIBLE} or {@link #INVISIBLE}. 7750 */ 7751 protected void onDisplayHint(int hint) { 7752 } 7753 7754 /** 7755 * Dispatch a window visibility change down the view hierarchy. 7756 * ViewGroups should override to route to their children. 7757 * 7758 * @param visibility The new visibility of the window. 7759 * 7760 * @see #onWindowVisibilityChanged(int) 7761 */ 7762 public void dispatchWindowVisibilityChanged(int visibility) { 7763 onWindowVisibilityChanged(visibility); 7764 } 7765 7766 /** 7767 * Called when the window containing has change its visibility 7768 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7769 * that this tells you whether or not your window is being made visible 7770 * to the window manager; this does <em>not</em> tell you whether or not 7771 * your window is obscured by other windows on the screen, even if it 7772 * is itself visible. 7773 * 7774 * @param visibility The new visibility of the window. 7775 */ 7776 protected void onWindowVisibilityChanged(int visibility) { 7777 if (visibility == VISIBLE) { 7778 initialAwakenScrollBars(); 7779 } 7780 } 7781 7782 /** 7783 * Returns the current visibility of the window this view is attached to 7784 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7785 * 7786 * @return Returns the current visibility of the view's window. 7787 */ 7788 public int getWindowVisibility() { 7789 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7790 } 7791 7792 /** 7793 * Retrieve the overall visible display size in which the window this view is 7794 * attached to has been positioned in. This takes into account screen 7795 * decorations above the window, for both cases where the window itself 7796 * is being position inside of them or the window is being placed under 7797 * then and covered insets are used for the window to position its content 7798 * inside. In effect, this tells you the available area where content can 7799 * be placed and remain visible to users. 7800 * 7801 * <p>This function requires an IPC back to the window manager to retrieve 7802 * the requested information, so should not be used in performance critical 7803 * code like drawing. 7804 * 7805 * @param outRect Filled in with the visible display frame. If the view 7806 * is not attached to a window, this is simply the raw display size. 7807 */ 7808 public void getWindowVisibleDisplayFrame(Rect outRect) { 7809 if (mAttachInfo != null) { 7810 try { 7811 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7812 } catch (RemoteException e) { 7813 return; 7814 } 7815 // XXX This is really broken, and probably all needs to be done 7816 // in the window manager, and we need to know more about whether 7817 // we want the area behind or in front of the IME. 7818 final Rect insets = mAttachInfo.mVisibleInsets; 7819 outRect.left += insets.left; 7820 outRect.top += insets.top; 7821 outRect.right -= insets.right; 7822 outRect.bottom -= insets.bottom; 7823 return; 7824 } 7825 // The view is not attached to a display so we don't have a context. 7826 // Make a best guess about the display size. 7827 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 7828 d.getRectSize(outRect); 7829 } 7830 7831 /** 7832 * Dispatch a notification about a resource configuration change down 7833 * the view hierarchy. 7834 * ViewGroups should override to route to their children. 7835 * 7836 * @param newConfig The new resource configuration. 7837 * 7838 * @see #onConfigurationChanged(android.content.res.Configuration) 7839 */ 7840 public void dispatchConfigurationChanged(Configuration newConfig) { 7841 onConfigurationChanged(newConfig); 7842 } 7843 7844 /** 7845 * Called when the current configuration of the resources being used 7846 * by the application have changed. You can use this to decide when 7847 * to reload resources that can changed based on orientation and other 7848 * configuration characterstics. You only need to use this if you are 7849 * not relying on the normal {@link android.app.Activity} mechanism of 7850 * recreating the activity instance upon a configuration change. 7851 * 7852 * @param newConfig The new resource configuration. 7853 */ 7854 protected void onConfigurationChanged(Configuration newConfig) { 7855 } 7856 7857 /** 7858 * Private function to aggregate all per-view attributes in to the view 7859 * root. 7860 */ 7861 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7862 performCollectViewAttributes(attachInfo, visibility); 7863 } 7864 7865 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7866 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7867 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7868 attachInfo.mKeepScreenOn = true; 7869 } 7870 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7871 ListenerInfo li = mListenerInfo; 7872 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7873 attachInfo.mHasSystemUiListeners = true; 7874 } 7875 } 7876 } 7877 7878 void needGlobalAttributesUpdate(boolean force) { 7879 final AttachInfo ai = mAttachInfo; 7880 if (ai != null && !ai.mRecomputeGlobalAttributes) { 7881 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7882 || ai.mHasSystemUiListeners) { 7883 ai.mRecomputeGlobalAttributes = true; 7884 } 7885 } 7886 } 7887 7888 /** 7889 * Returns whether the device is currently in touch mode. Touch mode is entered 7890 * once the user begins interacting with the device by touch, and affects various 7891 * things like whether focus is always visible to the user. 7892 * 7893 * @return Whether the device is in touch mode. 7894 */ 7895 @ViewDebug.ExportedProperty 7896 public boolean isInTouchMode() { 7897 if (mAttachInfo != null) { 7898 return mAttachInfo.mInTouchMode; 7899 } else { 7900 return ViewRootImpl.isInTouchMode(); 7901 } 7902 } 7903 7904 /** 7905 * Returns the context the view is running in, through which it can 7906 * access the current theme, resources, etc. 7907 * 7908 * @return The view's Context. 7909 */ 7910 @ViewDebug.CapturedViewProperty 7911 public final Context getContext() { 7912 return mContext; 7913 } 7914 7915 /** 7916 * Handle a key event before it is processed by any input method 7917 * associated with the view hierarchy. This can be used to intercept 7918 * key events in special situations before the IME consumes them; a 7919 * typical example would be handling the BACK key to update the application's 7920 * UI instead of allowing the IME to see it and close itself. 7921 * 7922 * @param keyCode The value in event.getKeyCode(). 7923 * @param event Description of the key event. 7924 * @return If you handled the event, return true. If you want to allow the 7925 * event to be handled by the next receiver, return false. 7926 */ 7927 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7928 return false; 7929 } 7930 7931 /** 7932 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7933 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7934 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7935 * is released, if the view is enabled and clickable. 7936 * 7937 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7938 * although some may elect to do so in some situations. Do not rely on this to 7939 * catch software key presses. 7940 * 7941 * @param keyCode A key code that represents the button pressed, from 7942 * {@link android.view.KeyEvent}. 7943 * @param event The KeyEvent object that defines the button action. 7944 */ 7945 public boolean onKeyDown(int keyCode, KeyEvent event) { 7946 boolean result = false; 7947 7948 if (KeyEvent.isConfirmKey(event.getKeyCode())) { 7949 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7950 return true; 7951 } 7952 // Long clickable items don't necessarily have to be clickable 7953 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7954 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7955 (event.getRepeatCount() == 0)) { 7956 setPressed(true); 7957 checkForLongClick(0); 7958 return true; 7959 } 7960 } 7961 return result; 7962 } 7963 7964 /** 7965 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7966 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7967 * the event). 7968 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7969 * although some may elect to do so in some situations. Do not rely on this to 7970 * catch software key presses. 7971 */ 7972 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7973 return false; 7974 } 7975 7976 /** 7977 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7978 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7979 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7980 * {@link KeyEvent#KEYCODE_ENTER} is released. 7981 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7982 * although some may elect to do so in some situations. Do not rely on this to 7983 * catch software key presses. 7984 * 7985 * @param keyCode A key code that represents the button pressed, from 7986 * {@link android.view.KeyEvent}. 7987 * @param event The KeyEvent object that defines the button action. 7988 */ 7989 public boolean onKeyUp(int keyCode, KeyEvent event) { 7990 boolean result = false; 7991 7992 switch (keyCode) { 7993 case KeyEvent.KEYCODE_DPAD_CENTER: 7994 case KeyEvent.KEYCODE_ENTER: { 7995 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7996 return true; 7997 } 7998 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7999 setPressed(false); 8000 8001 if (!mHasPerformedLongPress) { 8002 // This is a tap, so remove the longpress check 8003 removeLongPressCallback(); 8004 8005 result = performClick(); 8006 } 8007 } 8008 break; 8009 } 8010 } 8011 return result; 8012 } 8013 8014 /** 8015 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 8016 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 8017 * the event). 8018 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8019 * although some may elect to do so in some situations. Do not rely on this to 8020 * catch software key presses. 8021 * 8022 * @param keyCode A key code that represents the button pressed, from 8023 * {@link android.view.KeyEvent}. 8024 * @param repeatCount The number of times the action was made. 8025 * @param event The KeyEvent object that defines the button action. 8026 */ 8027 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 8028 return false; 8029 } 8030 8031 /** 8032 * Called on the focused view when a key shortcut event is not handled. 8033 * Override this method to implement local key shortcuts for the View. 8034 * Key shortcuts can also be implemented by setting the 8035 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 8036 * 8037 * @param keyCode The value in event.getKeyCode(). 8038 * @param event Description of the key event. 8039 * @return If you handled the event, return true. If you want to allow the 8040 * event to be handled by the next receiver, return false. 8041 */ 8042 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 8043 return false; 8044 } 8045 8046 /** 8047 * Check whether the called view is a text editor, in which case it 8048 * would make sense to automatically display a soft input window for 8049 * it. Subclasses should override this if they implement 8050 * {@link #onCreateInputConnection(EditorInfo)} to return true if 8051 * a call on that method would return a non-null InputConnection, and 8052 * they are really a first-class editor that the user would normally 8053 * start typing on when the go into a window containing your view. 8054 * 8055 * <p>The default implementation always returns false. This does 8056 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 8057 * will not be called or the user can not otherwise perform edits on your 8058 * view; it is just a hint to the system that this is not the primary 8059 * purpose of this view. 8060 * 8061 * @return Returns true if this view is a text editor, else false. 8062 */ 8063 public boolean onCheckIsTextEditor() { 8064 return false; 8065 } 8066 8067 /** 8068 * Create a new InputConnection for an InputMethod to interact 8069 * with the view. The default implementation returns null, since it doesn't 8070 * support input methods. You can override this to implement such support. 8071 * This is only needed for views that take focus and text input. 8072 * 8073 * <p>When implementing this, you probably also want to implement 8074 * {@link #onCheckIsTextEditor()} to indicate you will return a 8075 * non-null InputConnection. 8076 * 8077 * @param outAttrs Fill in with attribute information about the connection. 8078 */ 8079 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 8080 return null; 8081 } 8082 8083 /** 8084 * Called by the {@link android.view.inputmethod.InputMethodManager} 8085 * when a view who is not the current 8086 * input connection target is trying to make a call on the manager. The 8087 * default implementation returns false; you can override this to return 8088 * true for certain views if you are performing InputConnection proxying 8089 * to them. 8090 * @param view The View that is making the InputMethodManager call. 8091 * @return Return true to allow the call, false to reject. 8092 */ 8093 public boolean checkInputConnectionProxy(View view) { 8094 return false; 8095 } 8096 8097 /** 8098 * Show the context menu for this view. It is not safe to hold on to the 8099 * menu after returning from this method. 8100 * 8101 * You should normally not overload this method. Overload 8102 * {@link #onCreateContextMenu(ContextMenu)} or define an 8103 * {@link OnCreateContextMenuListener} to add items to the context menu. 8104 * 8105 * @param menu The context menu to populate 8106 */ 8107 public void createContextMenu(ContextMenu menu) { 8108 ContextMenuInfo menuInfo = getContextMenuInfo(); 8109 8110 // Sets the current menu info so all items added to menu will have 8111 // my extra info set. 8112 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 8113 8114 onCreateContextMenu(menu); 8115 ListenerInfo li = mListenerInfo; 8116 if (li != null && li.mOnCreateContextMenuListener != null) { 8117 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 8118 } 8119 8120 // Clear the extra information so subsequent items that aren't mine don't 8121 // have my extra info. 8122 ((MenuBuilder)menu).setCurrentMenuInfo(null); 8123 8124 if (mParent != null) { 8125 mParent.createContextMenu(menu); 8126 } 8127 } 8128 8129 /** 8130 * Views should implement this if they have extra information to associate 8131 * with the context menu. The return result is supplied as a parameter to 8132 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 8133 * callback. 8134 * 8135 * @return Extra information about the item for which the context menu 8136 * should be shown. This information will vary across different 8137 * subclasses of View. 8138 */ 8139 protected ContextMenuInfo getContextMenuInfo() { 8140 return null; 8141 } 8142 8143 /** 8144 * Views should implement this if the view itself is going to add items to 8145 * the context menu. 8146 * 8147 * @param menu the context menu to populate 8148 */ 8149 protected void onCreateContextMenu(ContextMenu menu) { 8150 } 8151 8152 /** 8153 * Implement this method to handle trackball motion events. The 8154 * <em>relative</em> movement of the trackball since the last event 8155 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 8156 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 8157 * that a movement of 1 corresponds to the user pressing one DPAD key (so 8158 * they will often be fractional values, representing the more fine-grained 8159 * movement information available from a trackball). 8160 * 8161 * @param event The motion event. 8162 * @return True if the event was handled, false otherwise. 8163 */ 8164 public boolean onTrackballEvent(MotionEvent event) { 8165 return false; 8166 } 8167 8168 /** 8169 * Implement this method to handle generic motion events. 8170 * <p> 8171 * Generic motion events describe joystick movements, mouse hovers, track pad 8172 * touches, scroll wheel movements and other input events. The 8173 * {@link MotionEvent#getSource() source} of the motion event specifies 8174 * the class of input that was received. Implementations of this method 8175 * must examine the bits in the source before processing the event. 8176 * The following code example shows how this is done. 8177 * </p><p> 8178 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8179 * are delivered to the view under the pointer. All other generic motion events are 8180 * delivered to the focused view. 8181 * </p> 8182 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 8183 * if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { 8184 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 8185 * // process the joystick movement... 8186 * return true; 8187 * } 8188 * } 8189 * if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { 8190 * switch (event.getAction()) { 8191 * case MotionEvent.ACTION_HOVER_MOVE: 8192 * // process the mouse hover movement... 8193 * return true; 8194 * case MotionEvent.ACTION_SCROLL: 8195 * // process the scroll wheel movement... 8196 * return true; 8197 * } 8198 * } 8199 * return super.onGenericMotionEvent(event); 8200 * }</pre> 8201 * 8202 * @param event The generic motion event being processed. 8203 * @return True if the event was handled, false otherwise. 8204 */ 8205 public boolean onGenericMotionEvent(MotionEvent event) { 8206 return false; 8207 } 8208 8209 /** 8210 * Implement this method to handle hover events. 8211 * <p> 8212 * This method is called whenever a pointer is hovering into, over, or out of the 8213 * bounds of a view and the view is not currently being touched. 8214 * Hover events are represented as pointer events with action 8215 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 8216 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 8217 * </p> 8218 * <ul> 8219 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 8220 * when the pointer enters the bounds of the view.</li> 8221 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 8222 * when the pointer has already entered the bounds of the view and has moved.</li> 8223 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 8224 * when the pointer has exited the bounds of the view or when the pointer is 8225 * about to go down due to a button click, tap, or similar user action that 8226 * causes the view to be touched.</li> 8227 * </ul> 8228 * <p> 8229 * The view should implement this method to return true to indicate that it is 8230 * handling the hover event, such as by changing its drawable state. 8231 * </p><p> 8232 * The default implementation calls {@link #setHovered} to update the hovered state 8233 * of the view when a hover enter or hover exit event is received, if the view 8234 * is enabled and is clickable. The default implementation also sends hover 8235 * accessibility events. 8236 * </p> 8237 * 8238 * @param event The motion event that describes the hover. 8239 * @return True if the view handled the hover event. 8240 * 8241 * @see #isHovered 8242 * @see #setHovered 8243 * @see #onHoverChanged 8244 */ 8245 public boolean onHoverEvent(MotionEvent event) { 8246 // The root view may receive hover (or touch) events that are outside the bounds of 8247 // the window. This code ensures that we only send accessibility events for 8248 // hovers that are actually within the bounds of the root view. 8249 final int action = event.getActionMasked(); 8250 if (!mSendingHoverAccessibilityEvents) { 8251 if ((action == MotionEvent.ACTION_HOVER_ENTER 8252 || action == MotionEvent.ACTION_HOVER_MOVE) 8253 && !hasHoveredChild() 8254 && pointInView(event.getX(), event.getY())) { 8255 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8256 mSendingHoverAccessibilityEvents = true; 8257 } 8258 } else { 8259 if (action == MotionEvent.ACTION_HOVER_EXIT 8260 || (action == MotionEvent.ACTION_MOVE 8261 && !pointInView(event.getX(), event.getY()))) { 8262 mSendingHoverAccessibilityEvents = false; 8263 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8264 // If the window does not have input focus we take away accessibility 8265 // focus as soon as the user stop hovering over the view. 8266 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8267 getViewRootImpl().setAccessibilityFocus(null, null); 8268 } 8269 } 8270 } 8271 8272 if (isHoverable()) { 8273 switch (action) { 8274 case MotionEvent.ACTION_HOVER_ENTER: 8275 setHovered(true); 8276 break; 8277 case MotionEvent.ACTION_HOVER_EXIT: 8278 setHovered(false); 8279 break; 8280 } 8281 8282 // Dispatch the event to onGenericMotionEvent before returning true. 8283 // This is to provide compatibility with existing applications that 8284 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8285 // break because of the new default handling for hoverable views 8286 // in onHoverEvent. 8287 // Note that onGenericMotionEvent will be called by default when 8288 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8289 dispatchGenericMotionEventInternal(event); 8290 // The event was already handled by calling setHovered(), so always 8291 // return true. 8292 return true; 8293 } 8294 8295 return false; 8296 } 8297 8298 /** 8299 * Returns true if the view should handle {@link #onHoverEvent} 8300 * by calling {@link #setHovered} to change its hovered state. 8301 * 8302 * @return True if the view is hoverable. 8303 */ 8304 private boolean isHoverable() { 8305 final int viewFlags = mViewFlags; 8306 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8307 return false; 8308 } 8309 8310 return (viewFlags & CLICKABLE) == CLICKABLE 8311 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8312 } 8313 8314 /** 8315 * Returns true if the view is currently hovered. 8316 * 8317 * @return True if the view is currently hovered. 8318 * 8319 * @see #setHovered 8320 * @see #onHoverChanged 8321 */ 8322 @ViewDebug.ExportedProperty 8323 public boolean isHovered() { 8324 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8325 } 8326 8327 /** 8328 * Sets whether the view is currently hovered. 8329 * <p> 8330 * Calling this method also changes the drawable state of the view. This 8331 * enables the view to react to hover by using different drawable resources 8332 * to change its appearance. 8333 * </p><p> 8334 * The {@link #onHoverChanged} method is called when the hovered state changes. 8335 * </p> 8336 * 8337 * @param hovered True if the view is hovered. 8338 * 8339 * @see #isHovered 8340 * @see #onHoverChanged 8341 */ 8342 public void setHovered(boolean hovered) { 8343 if (hovered) { 8344 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8345 mPrivateFlags |= PFLAG_HOVERED; 8346 refreshDrawableState(); 8347 onHoverChanged(true); 8348 } 8349 } else { 8350 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8351 mPrivateFlags &= ~PFLAG_HOVERED; 8352 refreshDrawableState(); 8353 onHoverChanged(false); 8354 } 8355 } 8356 } 8357 8358 /** 8359 * Implement this method to handle hover state changes. 8360 * <p> 8361 * This method is called whenever the hover state changes as a result of a 8362 * call to {@link #setHovered}. 8363 * </p> 8364 * 8365 * @param hovered The current hover state, as returned by {@link #isHovered}. 8366 * 8367 * @see #isHovered 8368 * @see #setHovered 8369 */ 8370 public void onHoverChanged(boolean hovered) { 8371 } 8372 8373 /** 8374 * Implement this method to handle touch screen motion events. 8375 * 8376 * @param event The motion event. 8377 * @return True if the event was handled, false otherwise. 8378 */ 8379 public boolean onTouchEvent(MotionEvent event) { 8380 final int viewFlags = mViewFlags; 8381 8382 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8383 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8384 setPressed(false); 8385 } 8386 // A disabled view that is clickable still consumes the touch 8387 // events, it just doesn't respond to them. 8388 return (((viewFlags & CLICKABLE) == CLICKABLE || 8389 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8390 } 8391 8392 if (mTouchDelegate != null) { 8393 if (mTouchDelegate.onTouchEvent(event)) { 8394 return true; 8395 } 8396 } 8397 8398 if (((viewFlags & CLICKABLE) == CLICKABLE || 8399 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8400 switch (event.getAction()) { 8401 case MotionEvent.ACTION_UP: 8402 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8403 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8404 // take focus if we don't have it already and we should in 8405 // touch mode. 8406 boolean focusTaken = false; 8407 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8408 focusTaken = requestFocus(); 8409 } 8410 8411 if (prepressed) { 8412 // The button is being released before we actually 8413 // showed it as pressed. Make it show the pressed 8414 // state now (before scheduling the click) to ensure 8415 // the user sees it. 8416 setPressed(true); 8417 } 8418 8419 if (!mHasPerformedLongPress) { 8420 // This is a tap, so remove the longpress check 8421 removeLongPressCallback(); 8422 8423 // Only perform take click actions if we were in the pressed state 8424 if (!focusTaken) { 8425 // Use a Runnable and post this rather than calling 8426 // performClick directly. This lets other visual state 8427 // of the view update before click actions start. 8428 if (mPerformClick == null) { 8429 mPerformClick = new PerformClick(); 8430 } 8431 if (!post(mPerformClick)) { 8432 performClick(); 8433 } 8434 } 8435 } 8436 8437 if (mUnsetPressedState == null) { 8438 mUnsetPressedState = new UnsetPressedState(); 8439 } 8440 8441 if (prepressed) { 8442 postDelayed(mUnsetPressedState, 8443 ViewConfiguration.getPressedStateDuration()); 8444 } else if (!post(mUnsetPressedState)) { 8445 // If the post failed, unpress right now 8446 mUnsetPressedState.run(); 8447 } 8448 removeTapCallback(); 8449 } 8450 break; 8451 8452 case MotionEvent.ACTION_DOWN: 8453 mHasPerformedLongPress = false; 8454 8455 if (performButtonActionOnTouchDown(event)) { 8456 break; 8457 } 8458 8459 // Walk up the hierarchy to determine if we're inside a scrolling container. 8460 boolean isInScrollingContainer = isInScrollingContainer(); 8461 8462 // For views inside a scrolling container, delay the pressed feedback for 8463 // a short period in case this is a scroll. 8464 if (isInScrollingContainer) { 8465 mPrivateFlags |= PFLAG_PREPRESSED; 8466 if (mPendingCheckForTap == null) { 8467 mPendingCheckForTap = new CheckForTap(); 8468 } 8469 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8470 } else { 8471 // Not inside a scrolling container, so show the feedback right away 8472 setPressed(true); 8473 checkForLongClick(0); 8474 } 8475 break; 8476 8477 case MotionEvent.ACTION_CANCEL: 8478 setPressed(false); 8479 removeTapCallback(); 8480 removeLongPressCallback(); 8481 break; 8482 8483 case MotionEvent.ACTION_MOVE: 8484 final int x = (int) event.getX(); 8485 final int y = (int) event.getY(); 8486 8487 // Be lenient about moving outside of buttons 8488 if (!pointInView(x, y, mTouchSlop)) { 8489 // Outside button 8490 removeTapCallback(); 8491 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8492 // Remove any future long press/tap checks 8493 removeLongPressCallback(); 8494 8495 setPressed(false); 8496 } 8497 } 8498 break; 8499 } 8500 return true; 8501 } 8502 8503 return false; 8504 } 8505 8506 /** 8507 * @hide 8508 */ 8509 public boolean isInScrollingContainer() { 8510 ViewParent p = getParent(); 8511 while (p != null && p instanceof ViewGroup) { 8512 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8513 return true; 8514 } 8515 p = p.getParent(); 8516 } 8517 return false; 8518 } 8519 8520 /** 8521 * Remove the longpress detection timer. 8522 */ 8523 private void removeLongPressCallback() { 8524 if (mPendingCheckForLongPress != null) { 8525 removeCallbacks(mPendingCheckForLongPress); 8526 } 8527 } 8528 8529 /** 8530 * Remove the pending click action 8531 */ 8532 private void removePerformClickCallback() { 8533 if (mPerformClick != null) { 8534 removeCallbacks(mPerformClick); 8535 } 8536 } 8537 8538 /** 8539 * Remove the prepress detection timer. 8540 */ 8541 private void removeUnsetPressCallback() { 8542 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8543 setPressed(false); 8544 removeCallbacks(mUnsetPressedState); 8545 } 8546 } 8547 8548 /** 8549 * Remove the tap detection timer. 8550 */ 8551 private void removeTapCallback() { 8552 if (mPendingCheckForTap != null) { 8553 mPrivateFlags &= ~PFLAG_PREPRESSED; 8554 removeCallbacks(mPendingCheckForTap); 8555 } 8556 } 8557 8558 /** 8559 * Cancels a pending long press. Your subclass can use this if you 8560 * want the context menu to come up if the user presses and holds 8561 * at the same place, but you don't want it to come up if they press 8562 * and then move around enough to cause scrolling. 8563 */ 8564 public void cancelLongPress() { 8565 removeLongPressCallback(); 8566 8567 /* 8568 * The prepressed state handled by the tap callback is a display 8569 * construct, but the tap callback will post a long press callback 8570 * less its own timeout. Remove it here. 8571 */ 8572 removeTapCallback(); 8573 } 8574 8575 /** 8576 * Remove the pending callback for sending a 8577 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8578 */ 8579 private void removeSendViewScrolledAccessibilityEventCallback() { 8580 if (mSendViewScrolledAccessibilityEvent != null) { 8581 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8582 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8583 } 8584 } 8585 8586 /** 8587 * Sets the TouchDelegate for this View. 8588 */ 8589 public void setTouchDelegate(TouchDelegate delegate) { 8590 mTouchDelegate = delegate; 8591 } 8592 8593 /** 8594 * Gets the TouchDelegate for this View. 8595 */ 8596 public TouchDelegate getTouchDelegate() { 8597 return mTouchDelegate; 8598 } 8599 8600 /** 8601 * Set flags controlling behavior of this view. 8602 * 8603 * @param flags Constant indicating the value which should be set 8604 * @param mask Constant indicating the bit range that should be changed 8605 */ 8606 void setFlags(int flags, int mask) { 8607 final boolean accessibilityEnabled = 8608 AccessibilityManager.getInstance(mContext).isEnabled(); 8609 final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility(); 8610 8611 int old = mViewFlags; 8612 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8613 8614 int changed = mViewFlags ^ old; 8615 if (changed == 0) { 8616 return; 8617 } 8618 int privateFlags = mPrivateFlags; 8619 8620 /* Check if the FOCUSABLE bit has changed */ 8621 if (((changed & FOCUSABLE_MASK) != 0) && 8622 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8623 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8624 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8625 /* Give up focus if we are no longer focusable */ 8626 clearFocus(); 8627 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8628 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8629 /* 8630 * Tell the view system that we are now available to take focus 8631 * if no one else already has it. 8632 */ 8633 if (mParent != null) mParent.focusableViewAvailable(this); 8634 } 8635 } 8636 8637 final int newVisibility = flags & VISIBILITY_MASK; 8638 if (newVisibility == VISIBLE) { 8639 if ((changed & VISIBILITY_MASK) != 0) { 8640 /* 8641 * If this view is becoming visible, invalidate it in case it changed while 8642 * it was not visible. Marking it drawn ensures that the invalidation will 8643 * go through. 8644 */ 8645 mPrivateFlags |= PFLAG_DRAWN; 8646 invalidate(true); 8647 8648 needGlobalAttributesUpdate(true); 8649 8650 // a view becoming visible is worth notifying the parent 8651 // about in case nothing has focus. even if this specific view 8652 // isn't focusable, it may contain something that is, so let 8653 // the root view try to give this focus if nothing else does. 8654 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8655 mParent.focusableViewAvailable(this); 8656 } 8657 } 8658 } 8659 8660 /* Check if the GONE bit has changed */ 8661 if ((changed & GONE) != 0) { 8662 needGlobalAttributesUpdate(false); 8663 requestLayout(); 8664 8665 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8666 if (hasFocus()) clearFocus(); 8667 clearAccessibilityFocus(); 8668 destroyDrawingCache(); 8669 if (mParent instanceof View) { 8670 // GONE views noop invalidation, so invalidate the parent 8671 ((View) mParent).invalidate(true); 8672 } 8673 // Mark the view drawn to ensure that it gets invalidated properly the next 8674 // time it is visible and gets invalidated 8675 mPrivateFlags |= PFLAG_DRAWN; 8676 } 8677 if (mAttachInfo != null) { 8678 mAttachInfo.mViewVisibilityChanged = true; 8679 } 8680 } 8681 8682 /* Check if the VISIBLE bit has changed */ 8683 if ((changed & INVISIBLE) != 0) { 8684 needGlobalAttributesUpdate(false); 8685 /* 8686 * If this view is becoming invisible, set the DRAWN flag so that 8687 * the next invalidate() will not be skipped. 8688 */ 8689 mPrivateFlags |= PFLAG_DRAWN; 8690 8691 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8692 // root view becoming invisible shouldn't clear focus and accessibility focus 8693 if (getRootView() != this) { 8694 clearFocus(); 8695 clearAccessibilityFocus(); 8696 } 8697 } 8698 if (mAttachInfo != null) { 8699 mAttachInfo.mViewVisibilityChanged = true; 8700 } 8701 } 8702 8703 if ((changed & VISIBILITY_MASK) != 0) { 8704 // If the view is invisible, cleanup its display list to free up resources 8705 if (newVisibility != VISIBLE) { 8706 cleanupDraw(); 8707 } 8708 8709 if (mParent instanceof ViewGroup) { 8710 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8711 (changed & VISIBILITY_MASK), newVisibility); 8712 ((View) mParent).invalidate(true); 8713 } else if (mParent != null) { 8714 mParent.invalidateChild(this, null); 8715 } 8716 dispatchVisibilityChanged(this, newVisibility); 8717 } 8718 8719 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8720 destroyDrawingCache(); 8721 } 8722 8723 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8724 destroyDrawingCache(); 8725 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8726 invalidateParentCaches(); 8727 } 8728 8729 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8730 destroyDrawingCache(); 8731 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8732 } 8733 8734 if ((changed & DRAW_MASK) != 0) { 8735 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8736 if (mBackground != null) { 8737 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8738 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8739 } else { 8740 mPrivateFlags |= PFLAG_SKIP_DRAW; 8741 } 8742 } else { 8743 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8744 } 8745 requestLayout(); 8746 invalidate(true); 8747 } 8748 8749 if ((changed & KEEP_SCREEN_ON) != 0) { 8750 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8751 mParent.recomputeViewAttributes(this); 8752 } 8753 } 8754 8755 if (accessibilityEnabled) { 8756 if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0 8757 || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0) { 8758 if (oldIncludeForAccessibility != includeForAccessibility()) { 8759 notifySubtreeAccessibilityStateChangedIfNeeded(); 8760 } else { 8761 notifyViewAccessibilityStateChangedIfNeeded(); 8762 } 8763 } 8764 if ((changed & ENABLED_MASK) != 0) { 8765 notifyViewAccessibilityStateChangedIfNeeded(); 8766 } 8767 } 8768 } 8769 8770 /** 8771 * Change the view's z order in the tree, so it's on top of other sibling 8772 * views. This ordering change may affect layout, if the parent container 8773 * uses an order-dependent layout scheme (e.g., LinearLayout). This 8774 * method should be followed by calls to {@link #requestLayout()} and 8775 * {@link View#invalidate()} on the parent. 8776 * 8777 * @see ViewGroup#bringChildToFront(View) 8778 */ 8779 public void bringToFront() { 8780 if (mParent != null) { 8781 mParent.bringChildToFront(this); 8782 } 8783 } 8784 8785 /** 8786 * This is called in response to an internal scroll in this view (i.e., the 8787 * view scrolled its own contents). This is typically as a result of 8788 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8789 * called. 8790 * 8791 * @param l Current horizontal scroll origin. 8792 * @param t Current vertical scroll origin. 8793 * @param oldl Previous horizontal scroll origin. 8794 * @param oldt Previous vertical scroll origin. 8795 */ 8796 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8797 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8798 postSendViewScrolledAccessibilityEventCallback(); 8799 } 8800 8801 mBackgroundSizeChanged = true; 8802 8803 final AttachInfo ai = mAttachInfo; 8804 if (ai != null) { 8805 ai.mViewScrollChanged = true; 8806 } 8807 } 8808 8809 /** 8810 * Interface definition for a callback to be invoked when the layout bounds of a view 8811 * changes due to layout processing. 8812 */ 8813 public interface OnLayoutChangeListener { 8814 /** 8815 * Called when the focus state of a view has changed. 8816 * 8817 * @param v The view whose state has changed. 8818 * @param left The new value of the view's left property. 8819 * @param top The new value of the view's top property. 8820 * @param right The new value of the view's right property. 8821 * @param bottom The new value of the view's bottom property. 8822 * @param oldLeft The previous value of the view's left property. 8823 * @param oldTop The previous value of the view's top property. 8824 * @param oldRight The previous value of the view's right property. 8825 * @param oldBottom The previous value of the view's bottom property. 8826 */ 8827 void onLayoutChange(View v, int left, int top, int right, int bottom, 8828 int oldLeft, int oldTop, int oldRight, int oldBottom); 8829 } 8830 8831 /** 8832 * This is called during layout when the size of this view has changed. If 8833 * you were just added to the view hierarchy, you're called with the old 8834 * values of 0. 8835 * 8836 * @param w Current width of this view. 8837 * @param h Current height of this view. 8838 * @param oldw Old width of this view. 8839 * @param oldh Old height of this view. 8840 */ 8841 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8842 } 8843 8844 /** 8845 * Called by draw to draw the child views. This may be overridden 8846 * by derived classes to gain control just before its children are drawn 8847 * (but after its own view has been drawn). 8848 * @param canvas the canvas on which to draw the view 8849 */ 8850 protected void dispatchDraw(Canvas canvas) { 8851 8852 } 8853 8854 /** 8855 * Gets the parent of this view. Note that the parent is a 8856 * ViewParent and not necessarily a View. 8857 * 8858 * @return Parent of this view. 8859 */ 8860 public final ViewParent getParent() { 8861 return mParent; 8862 } 8863 8864 /** 8865 * Set the horizontal scrolled position of your view. This will cause a call to 8866 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8867 * invalidated. 8868 * @param value the x position to scroll to 8869 */ 8870 public void setScrollX(int value) { 8871 scrollTo(value, mScrollY); 8872 } 8873 8874 /** 8875 * Set the vertical scrolled position of your view. This will cause a call to 8876 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8877 * invalidated. 8878 * @param value the y position to scroll to 8879 */ 8880 public void setScrollY(int value) { 8881 scrollTo(mScrollX, value); 8882 } 8883 8884 /** 8885 * Return the scrolled left position of this view. This is the left edge of 8886 * the displayed part of your view. You do not need to draw any pixels 8887 * farther left, since those are outside of the frame of your view on 8888 * screen. 8889 * 8890 * @return The left edge of the displayed part of your view, in pixels. 8891 */ 8892 public final int getScrollX() { 8893 return mScrollX; 8894 } 8895 8896 /** 8897 * Return the scrolled top position of this view. This is the top edge of 8898 * the displayed part of your view. You do not need to draw any pixels above 8899 * it, since those are outside of the frame of your view on screen. 8900 * 8901 * @return The top edge of the displayed part of your view, in pixels. 8902 */ 8903 public final int getScrollY() { 8904 return mScrollY; 8905 } 8906 8907 /** 8908 * Return the width of the your view. 8909 * 8910 * @return The width of your view, in pixels. 8911 */ 8912 @ViewDebug.ExportedProperty(category = "layout") 8913 public final int getWidth() { 8914 return mRight - mLeft; 8915 } 8916 8917 /** 8918 * Return the height of your view. 8919 * 8920 * @return The height of your view, in pixels. 8921 */ 8922 @ViewDebug.ExportedProperty(category = "layout") 8923 public final int getHeight() { 8924 return mBottom - mTop; 8925 } 8926 8927 /** 8928 * Return the visible drawing bounds of your view. Fills in the output 8929 * rectangle with the values from getScrollX(), getScrollY(), 8930 * getWidth(), and getHeight(). These bounds do not account for any 8931 * transformation properties currently set on the view, such as 8932 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 8933 * 8934 * @param outRect The (scrolled) drawing bounds of the view. 8935 */ 8936 public void getDrawingRect(Rect outRect) { 8937 outRect.left = mScrollX; 8938 outRect.top = mScrollY; 8939 outRect.right = mScrollX + (mRight - mLeft); 8940 outRect.bottom = mScrollY + (mBottom - mTop); 8941 } 8942 8943 /** 8944 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8945 * raw width component (that is the result is masked by 8946 * {@link #MEASURED_SIZE_MASK}). 8947 * 8948 * @return The raw measured width of this view. 8949 */ 8950 public final int getMeasuredWidth() { 8951 return mMeasuredWidth & MEASURED_SIZE_MASK; 8952 } 8953 8954 /** 8955 * Return the full width measurement information for this view as computed 8956 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8957 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8958 * This should be used during measurement and layout calculations only. Use 8959 * {@link #getWidth()} to see how wide a view is after layout. 8960 * 8961 * @return The measured width of this view as a bit mask. 8962 */ 8963 public final int getMeasuredWidthAndState() { 8964 return mMeasuredWidth; 8965 } 8966 8967 /** 8968 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8969 * raw width component (that is the result is masked by 8970 * {@link #MEASURED_SIZE_MASK}). 8971 * 8972 * @return The raw measured height of this view. 8973 */ 8974 public final int getMeasuredHeight() { 8975 return mMeasuredHeight & MEASURED_SIZE_MASK; 8976 } 8977 8978 /** 8979 * Return the full height measurement information for this view as computed 8980 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8981 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8982 * This should be used during measurement and layout calculations only. Use 8983 * {@link #getHeight()} to see how wide a view is after layout. 8984 * 8985 * @return The measured width of this view as a bit mask. 8986 */ 8987 public final int getMeasuredHeightAndState() { 8988 return mMeasuredHeight; 8989 } 8990 8991 /** 8992 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8993 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8994 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8995 * and the height component is at the shifted bits 8996 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8997 */ 8998 public final int getMeasuredState() { 8999 return (mMeasuredWidth&MEASURED_STATE_MASK) 9000 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 9001 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 9002 } 9003 9004 /** 9005 * The transform matrix of this view, which is calculated based on the current 9006 * roation, scale, and pivot properties. 9007 * 9008 * @see #getRotation() 9009 * @see #getScaleX() 9010 * @see #getScaleY() 9011 * @see #getPivotX() 9012 * @see #getPivotY() 9013 * @return The current transform matrix for the view 9014 */ 9015 public Matrix getMatrix() { 9016 if (mTransformationInfo != null) { 9017 updateMatrix(); 9018 return mTransformationInfo.mMatrix; 9019 } 9020 return Matrix.IDENTITY_MATRIX; 9021 } 9022 9023 /** 9024 * Utility function to determine if the value is far enough away from zero to be 9025 * considered non-zero. 9026 * @param value A floating point value to check for zero-ness 9027 * @return whether the passed-in value is far enough away from zero to be considered non-zero 9028 */ 9029 private static boolean nonzero(float value) { 9030 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 9031 } 9032 9033 /** 9034 * Returns true if the transform matrix is the identity matrix. 9035 * Recomputes the matrix if necessary. 9036 * 9037 * @return True if the transform matrix is the identity matrix, false otherwise. 9038 */ 9039 final boolean hasIdentityMatrix() { 9040 if (mTransformationInfo != null) { 9041 updateMatrix(); 9042 return mTransformationInfo.mMatrixIsIdentity; 9043 } 9044 return true; 9045 } 9046 9047 void ensureTransformationInfo() { 9048 if (mTransformationInfo == null) { 9049 mTransformationInfo = new TransformationInfo(); 9050 } 9051 } 9052 9053 /** 9054 * Recomputes the transform matrix if necessary. 9055 */ 9056 private void updateMatrix() { 9057 final TransformationInfo info = mTransformationInfo; 9058 if (info == null) { 9059 return; 9060 } 9061 if (info.mMatrixDirty) { 9062 // transform-related properties have changed since the last time someone 9063 // asked for the matrix; recalculate it with the current values 9064 9065 // Figure out if we need to update the pivot point 9066 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9067 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 9068 info.mPrevWidth = mRight - mLeft; 9069 info.mPrevHeight = mBottom - mTop; 9070 info.mPivotX = info.mPrevWidth / 2f; 9071 info.mPivotY = info.mPrevHeight / 2f; 9072 } 9073 } 9074 info.mMatrix.reset(); 9075 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 9076 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 9077 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 9078 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9079 } else { 9080 if (info.mCamera == null) { 9081 info.mCamera = new Camera(); 9082 info.matrix3D = new Matrix(); 9083 } 9084 info.mCamera.save(); 9085 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9086 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 9087 info.mCamera.getMatrix(info.matrix3D); 9088 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 9089 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 9090 info.mPivotY + info.mTranslationY); 9091 info.mMatrix.postConcat(info.matrix3D); 9092 info.mCamera.restore(); 9093 } 9094 info.mMatrixDirty = false; 9095 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 9096 info.mInverseMatrixDirty = true; 9097 } 9098 } 9099 9100 /** 9101 * Utility method to retrieve the inverse of the current mMatrix property. 9102 * We cache the matrix to avoid recalculating it when transform properties 9103 * have not changed. 9104 * 9105 * @return The inverse of the current matrix of this view. 9106 */ 9107 final Matrix getInverseMatrix() { 9108 final TransformationInfo info = mTransformationInfo; 9109 if (info != null) { 9110 updateMatrix(); 9111 if (info.mInverseMatrixDirty) { 9112 if (info.mInverseMatrix == null) { 9113 info.mInverseMatrix = new Matrix(); 9114 } 9115 info.mMatrix.invert(info.mInverseMatrix); 9116 info.mInverseMatrixDirty = false; 9117 } 9118 return info.mInverseMatrix; 9119 } 9120 return Matrix.IDENTITY_MATRIX; 9121 } 9122 9123 /** 9124 * Gets the distance along the Z axis from the camera to this view. 9125 * 9126 * @see #setCameraDistance(float) 9127 * 9128 * @return The distance along the Z axis. 9129 */ 9130 public float getCameraDistance() { 9131 ensureTransformationInfo(); 9132 final float dpi = mResources.getDisplayMetrics().densityDpi; 9133 final TransformationInfo info = mTransformationInfo; 9134 if (info.mCamera == null) { 9135 info.mCamera = new Camera(); 9136 info.matrix3D = new Matrix(); 9137 } 9138 return -(info.mCamera.getLocationZ() * dpi); 9139 } 9140 9141 /** 9142 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 9143 * views are drawn) from the camera to this view. The camera's distance 9144 * affects 3D transformations, for instance rotations around the X and Y 9145 * axis. If the rotationX or rotationY properties are changed and this view is 9146 * large (more than half the size of the screen), it is recommended to always 9147 * use a camera distance that's greater than the height (X axis rotation) or 9148 * the width (Y axis rotation) of this view.</p> 9149 * 9150 * <p>The distance of the camera from the view plane can have an affect on the 9151 * perspective distortion of the view when it is rotated around the x or y axis. 9152 * For example, a large distance will result in a large viewing angle, and there 9153 * will not be much perspective distortion of the view as it rotates. A short 9154 * distance may cause much more perspective distortion upon rotation, and can 9155 * also result in some drawing artifacts if the rotated view ends up partially 9156 * behind the camera (which is why the recommendation is to use a distance at 9157 * least as far as the size of the view, if the view is to be rotated.)</p> 9158 * 9159 * <p>The distance is expressed in "depth pixels." The default distance depends 9160 * on the screen density. For instance, on a medium density display, the 9161 * default distance is 1280. On a high density display, the default distance 9162 * is 1920.</p> 9163 * 9164 * <p>If you want to specify a distance that leads to visually consistent 9165 * results across various densities, use the following formula:</p> 9166 * <pre> 9167 * float scale = context.getResources().getDisplayMetrics().density; 9168 * view.setCameraDistance(distance * scale); 9169 * </pre> 9170 * 9171 * <p>The density scale factor of a high density display is 1.5, 9172 * and 1920 = 1280 * 1.5.</p> 9173 * 9174 * @param distance The distance in "depth pixels", if negative the opposite 9175 * value is used 9176 * 9177 * @see #setRotationX(float) 9178 * @see #setRotationY(float) 9179 */ 9180 public void setCameraDistance(float distance) { 9181 invalidateViewProperty(true, false); 9182 9183 ensureTransformationInfo(); 9184 final float dpi = mResources.getDisplayMetrics().densityDpi; 9185 final TransformationInfo info = mTransformationInfo; 9186 if (info.mCamera == null) { 9187 info.mCamera = new Camera(); 9188 info.matrix3D = new Matrix(); 9189 } 9190 9191 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 9192 info.mMatrixDirty = true; 9193 9194 invalidateViewProperty(false, false); 9195 if (mDisplayList != null) { 9196 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 9197 } 9198 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9199 // View was rejected last time it was drawn by its parent; this may have changed 9200 invalidateParentIfNeeded(); 9201 } 9202 } 9203 9204 /** 9205 * The degrees that the view is rotated around the pivot point. 9206 * 9207 * @see #setRotation(float) 9208 * @see #getPivotX() 9209 * @see #getPivotY() 9210 * 9211 * @return The degrees of rotation. 9212 */ 9213 @ViewDebug.ExportedProperty(category = "drawing") 9214 public float getRotation() { 9215 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 9216 } 9217 9218 /** 9219 * Sets the degrees that the view is rotated around the pivot point. Increasing values 9220 * result in clockwise rotation. 9221 * 9222 * @param rotation The degrees of rotation. 9223 * 9224 * @see #getRotation() 9225 * @see #getPivotX() 9226 * @see #getPivotY() 9227 * @see #setRotationX(float) 9228 * @see #setRotationY(float) 9229 * 9230 * @attr ref android.R.styleable#View_rotation 9231 */ 9232 public void setRotation(float rotation) { 9233 ensureTransformationInfo(); 9234 final TransformationInfo info = mTransformationInfo; 9235 if (info.mRotation != rotation) { 9236 // Double-invalidation is necessary to capture view's old and new areas 9237 invalidateViewProperty(true, false); 9238 info.mRotation = rotation; 9239 info.mMatrixDirty = true; 9240 invalidateViewProperty(false, true); 9241 if (mDisplayList != null) { 9242 mDisplayList.setRotation(rotation); 9243 } 9244 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9245 // View was rejected last time it was drawn by its parent; this may have changed 9246 invalidateParentIfNeeded(); 9247 } 9248 } 9249 } 9250 9251 /** 9252 * The degrees that the view is rotated around the vertical axis through the pivot point. 9253 * 9254 * @see #getPivotX() 9255 * @see #getPivotY() 9256 * @see #setRotationY(float) 9257 * 9258 * @return The degrees of Y rotation. 9259 */ 9260 @ViewDebug.ExportedProperty(category = "drawing") 9261 public float getRotationY() { 9262 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 9263 } 9264 9265 /** 9266 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9267 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9268 * down the y axis. 9269 * 9270 * When rotating large views, it is recommended to adjust the camera distance 9271 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9272 * 9273 * @param rotationY The degrees of Y rotation. 9274 * 9275 * @see #getRotationY() 9276 * @see #getPivotX() 9277 * @see #getPivotY() 9278 * @see #setRotation(float) 9279 * @see #setRotationX(float) 9280 * @see #setCameraDistance(float) 9281 * 9282 * @attr ref android.R.styleable#View_rotationY 9283 */ 9284 public void setRotationY(float rotationY) { 9285 ensureTransformationInfo(); 9286 final TransformationInfo info = mTransformationInfo; 9287 if (info.mRotationY != rotationY) { 9288 invalidateViewProperty(true, false); 9289 info.mRotationY = rotationY; 9290 info.mMatrixDirty = true; 9291 invalidateViewProperty(false, true); 9292 if (mDisplayList != null) { 9293 mDisplayList.setRotationY(rotationY); 9294 } 9295 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9296 // View was rejected last time it was drawn by its parent; this may have changed 9297 invalidateParentIfNeeded(); 9298 } 9299 } 9300 } 9301 9302 /** 9303 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9304 * 9305 * @see #getPivotX() 9306 * @see #getPivotY() 9307 * @see #setRotationX(float) 9308 * 9309 * @return The degrees of X rotation. 9310 */ 9311 @ViewDebug.ExportedProperty(category = "drawing") 9312 public float getRotationX() { 9313 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9314 } 9315 9316 /** 9317 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9318 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9319 * x axis. 9320 * 9321 * When rotating large views, it is recommended to adjust the camera distance 9322 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9323 * 9324 * @param rotationX The degrees of X rotation. 9325 * 9326 * @see #getRotationX() 9327 * @see #getPivotX() 9328 * @see #getPivotY() 9329 * @see #setRotation(float) 9330 * @see #setRotationY(float) 9331 * @see #setCameraDistance(float) 9332 * 9333 * @attr ref android.R.styleable#View_rotationX 9334 */ 9335 public void setRotationX(float rotationX) { 9336 ensureTransformationInfo(); 9337 final TransformationInfo info = mTransformationInfo; 9338 if (info.mRotationX != rotationX) { 9339 invalidateViewProperty(true, false); 9340 info.mRotationX = rotationX; 9341 info.mMatrixDirty = true; 9342 invalidateViewProperty(false, true); 9343 if (mDisplayList != null) { 9344 mDisplayList.setRotationX(rotationX); 9345 } 9346 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9347 // View was rejected last time it was drawn by its parent; this may have changed 9348 invalidateParentIfNeeded(); 9349 } 9350 } 9351 } 9352 9353 /** 9354 * The amount that the view is scaled in x around the pivot point, as a proportion of 9355 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9356 * 9357 * <p>By default, this is 1.0f. 9358 * 9359 * @see #getPivotX() 9360 * @see #getPivotY() 9361 * @return The scaling factor. 9362 */ 9363 @ViewDebug.ExportedProperty(category = "drawing") 9364 public float getScaleX() { 9365 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9366 } 9367 9368 /** 9369 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9370 * the view's unscaled width. A value of 1 means that no scaling is applied. 9371 * 9372 * @param scaleX The scaling factor. 9373 * @see #getPivotX() 9374 * @see #getPivotY() 9375 * 9376 * @attr ref android.R.styleable#View_scaleX 9377 */ 9378 public void setScaleX(float scaleX) { 9379 ensureTransformationInfo(); 9380 final TransformationInfo info = mTransformationInfo; 9381 if (info.mScaleX != scaleX) { 9382 invalidateViewProperty(true, false); 9383 info.mScaleX = scaleX; 9384 info.mMatrixDirty = true; 9385 invalidateViewProperty(false, true); 9386 if (mDisplayList != null) { 9387 mDisplayList.setScaleX(scaleX); 9388 } 9389 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9390 // View was rejected last time it was drawn by its parent; this may have changed 9391 invalidateParentIfNeeded(); 9392 } 9393 } 9394 } 9395 9396 /** 9397 * The amount that the view is scaled in y around the pivot point, as a proportion of 9398 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9399 * 9400 * <p>By default, this is 1.0f. 9401 * 9402 * @see #getPivotX() 9403 * @see #getPivotY() 9404 * @return The scaling factor. 9405 */ 9406 @ViewDebug.ExportedProperty(category = "drawing") 9407 public float getScaleY() { 9408 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9409 } 9410 9411 /** 9412 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9413 * the view's unscaled width. A value of 1 means that no scaling is applied. 9414 * 9415 * @param scaleY The scaling factor. 9416 * @see #getPivotX() 9417 * @see #getPivotY() 9418 * 9419 * @attr ref android.R.styleable#View_scaleY 9420 */ 9421 public void setScaleY(float scaleY) { 9422 ensureTransformationInfo(); 9423 final TransformationInfo info = mTransformationInfo; 9424 if (info.mScaleY != scaleY) { 9425 invalidateViewProperty(true, false); 9426 info.mScaleY = scaleY; 9427 info.mMatrixDirty = true; 9428 invalidateViewProperty(false, true); 9429 if (mDisplayList != null) { 9430 mDisplayList.setScaleY(scaleY); 9431 } 9432 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9433 // View was rejected last time it was drawn by its parent; this may have changed 9434 invalidateParentIfNeeded(); 9435 } 9436 } 9437 } 9438 9439 /** 9440 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9441 * and {@link #setScaleX(float) scaled}. 9442 * 9443 * @see #getRotation() 9444 * @see #getScaleX() 9445 * @see #getScaleY() 9446 * @see #getPivotY() 9447 * @return The x location of the pivot point. 9448 * 9449 * @attr ref android.R.styleable#View_transformPivotX 9450 */ 9451 @ViewDebug.ExportedProperty(category = "drawing") 9452 public float getPivotX() { 9453 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9454 } 9455 9456 /** 9457 * Sets the x location of the point around which the view is 9458 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9459 * By default, the pivot point is centered on the object. 9460 * Setting this property disables this behavior and causes the view to use only the 9461 * explicitly set pivotX and pivotY values. 9462 * 9463 * @param pivotX The x location of the pivot point. 9464 * @see #getRotation() 9465 * @see #getScaleX() 9466 * @see #getScaleY() 9467 * @see #getPivotY() 9468 * 9469 * @attr ref android.R.styleable#View_transformPivotX 9470 */ 9471 public void setPivotX(float pivotX) { 9472 ensureTransformationInfo(); 9473 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9474 final TransformationInfo info = mTransformationInfo; 9475 if (info.mPivotX != pivotX) { 9476 invalidateViewProperty(true, false); 9477 info.mPivotX = pivotX; 9478 info.mMatrixDirty = true; 9479 invalidateViewProperty(false, true); 9480 if (mDisplayList != null) { 9481 mDisplayList.setPivotX(pivotX); 9482 } 9483 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9484 // View was rejected last time it was drawn by its parent; this may have changed 9485 invalidateParentIfNeeded(); 9486 } 9487 } 9488 } 9489 9490 /** 9491 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9492 * and {@link #setScaleY(float) scaled}. 9493 * 9494 * @see #getRotation() 9495 * @see #getScaleX() 9496 * @see #getScaleY() 9497 * @see #getPivotY() 9498 * @return The y location of the pivot point. 9499 * 9500 * @attr ref android.R.styleable#View_transformPivotY 9501 */ 9502 @ViewDebug.ExportedProperty(category = "drawing") 9503 public float getPivotY() { 9504 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9505 } 9506 9507 /** 9508 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9509 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9510 * Setting this property disables this behavior and causes the view to use only the 9511 * explicitly set pivotX and pivotY values. 9512 * 9513 * @param pivotY The y location of the pivot point. 9514 * @see #getRotation() 9515 * @see #getScaleX() 9516 * @see #getScaleY() 9517 * @see #getPivotY() 9518 * 9519 * @attr ref android.R.styleable#View_transformPivotY 9520 */ 9521 public void setPivotY(float pivotY) { 9522 ensureTransformationInfo(); 9523 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9524 final TransformationInfo info = mTransformationInfo; 9525 if (info.mPivotY != pivotY) { 9526 invalidateViewProperty(true, false); 9527 info.mPivotY = pivotY; 9528 info.mMatrixDirty = true; 9529 invalidateViewProperty(false, true); 9530 if (mDisplayList != null) { 9531 mDisplayList.setPivotY(pivotY); 9532 } 9533 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9534 // View was rejected last time it was drawn by its parent; this may have changed 9535 invalidateParentIfNeeded(); 9536 } 9537 } 9538 } 9539 9540 /** 9541 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9542 * completely transparent and 1 means the view is completely opaque. 9543 * 9544 * <p>By default this is 1.0f. 9545 * @return The opacity of the view. 9546 */ 9547 @ViewDebug.ExportedProperty(category = "drawing") 9548 public float getAlpha() { 9549 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9550 } 9551 9552 /** 9553 * Returns whether this View has content which overlaps. This function, intended to be 9554 * overridden by specific View types, is an optimization when alpha is set on a view. If 9555 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 9556 * and then composited it into place, which can be expensive. If the view has no overlapping 9557 * rendering, the view can draw each primitive with the appropriate alpha value directly. 9558 * An example of overlapping rendering is a TextView with a background image, such as a 9559 * Button. An example of non-overlapping rendering is a TextView with no background, or 9560 * an ImageView with only the foreground image. The default implementation returns true; 9561 * subclasses should override if they have cases which can be optimized. 9562 * 9563 * @return true if the content in this view might overlap, false otherwise. 9564 */ 9565 public boolean hasOverlappingRendering() { 9566 return true; 9567 } 9568 9569 /** 9570 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9571 * completely transparent and 1 means the view is completely opaque.</p> 9572 * 9573 * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant 9574 * performance implications, especially for large views. It is best to use the alpha property 9575 * sparingly and transiently, as in the case of fading animations.</p> 9576 * 9577 * <p>For a view with a frequently changing alpha, such as during a fading animation, it is 9578 * strongly recommended for performance reasons to either override 9579 * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a 9580 * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p> 9581 * 9582 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9583 * responsible for applying the opacity itself.</p> 9584 * 9585 * <p>Note that if the view is backed by a 9586 * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a 9587 * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than 9588 * 1.0 will supercede the alpha of the layer paint.</p> 9589 * 9590 * @param alpha The opacity of the view. 9591 * 9592 * @see #hasOverlappingRendering() 9593 * @see #setLayerType(int, android.graphics.Paint) 9594 * 9595 * @attr ref android.R.styleable#View_alpha 9596 */ 9597 public void setAlpha(float alpha) { 9598 ensureTransformationInfo(); 9599 if (mTransformationInfo.mAlpha != alpha) { 9600 mTransformationInfo.mAlpha = alpha; 9601 if (onSetAlpha((int) (alpha * 255))) { 9602 mPrivateFlags |= PFLAG_ALPHA_SET; 9603 // subclass is handling alpha - don't optimize rendering cache invalidation 9604 invalidateParentCaches(); 9605 invalidate(true); 9606 } else { 9607 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9608 invalidateViewProperty(true, false); 9609 if (mDisplayList != null) { 9610 mDisplayList.setAlpha(alpha); 9611 } 9612 } 9613 } 9614 } 9615 9616 /** 9617 * Faster version of setAlpha() which performs the same steps except there are 9618 * no calls to invalidate(). The caller of this function should perform proper invalidation 9619 * on the parent and this object. The return value indicates whether the subclass handles 9620 * alpha (the return value for onSetAlpha()). 9621 * 9622 * @param alpha The new value for the alpha property 9623 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9624 * the new value for the alpha property is different from the old value 9625 */ 9626 boolean setAlphaNoInvalidation(float alpha) { 9627 ensureTransformationInfo(); 9628 if (mTransformationInfo.mAlpha != alpha) { 9629 mTransformationInfo.mAlpha = alpha; 9630 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9631 if (subclassHandlesAlpha) { 9632 mPrivateFlags |= PFLAG_ALPHA_SET; 9633 return true; 9634 } else { 9635 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9636 if (mDisplayList != null) { 9637 mDisplayList.setAlpha(alpha); 9638 } 9639 } 9640 } 9641 return false; 9642 } 9643 9644 /** 9645 * Top position of this view relative to its parent. 9646 * 9647 * @return The top of this view, in pixels. 9648 */ 9649 @ViewDebug.CapturedViewProperty 9650 public final int getTop() { 9651 return mTop; 9652 } 9653 9654 /** 9655 * Sets the top position of this view relative to its parent. This method is meant to be called 9656 * by the layout system and should not generally be called otherwise, because the property 9657 * may be changed at any time by the layout. 9658 * 9659 * @param top The top of this view, in pixels. 9660 */ 9661 public final void setTop(int top) { 9662 if (top != mTop) { 9663 updateMatrix(); 9664 final boolean matrixIsIdentity = mTransformationInfo == null 9665 || mTransformationInfo.mMatrixIsIdentity; 9666 if (matrixIsIdentity) { 9667 if (mAttachInfo != null) { 9668 int minTop; 9669 int yLoc; 9670 if (top < mTop) { 9671 minTop = top; 9672 yLoc = top - mTop; 9673 } else { 9674 minTop = mTop; 9675 yLoc = 0; 9676 } 9677 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9678 } 9679 } else { 9680 // Double-invalidation is necessary to capture view's old and new areas 9681 invalidate(true); 9682 } 9683 9684 int width = mRight - mLeft; 9685 int oldHeight = mBottom - mTop; 9686 9687 mTop = top; 9688 if (mDisplayList != null) { 9689 mDisplayList.setTop(mTop); 9690 } 9691 9692 sizeChange(width, mBottom - mTop, width, oldHeight); 9693 9694 if (!matrixIsIdentity) { 9695 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9696 // A change in dimension means an auto-centered pivot point changes, too 9697 mTransformationInfo.mMatrixDirty = true; 9698 } 9699 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9700 invalidate(true); 9701 } 9702 mBackgroundSizeChanged = true; 9703 invalidateParentIfNeeded(); 9704 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9705 // View was rejected last time it was drawn by its parent; this may have changed 9706 invalidateParentIfNeeded(); 9707 } 9708 } 9709 } 9710 9711 /** 9712 * Bottom position of this view relative to its parent. 9713 * 9714 * @return The bottom of this view, in pixels. 9715 */ 9716 @ViewDebug.CapturedViewProperty 9717 public final int getBottom() { 9718 return mBottom; 9719 } 9720 9721 /** 9722 * True if this view has changed since the last time being drawn. 9723 * 9724 * @return The dirty state of this view. 9725 */ 9726 public boolean isDirty() { 9727 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 9728 } 9729 9730 /** 9731 * Sets the bottom position of this view relative to its parent. This method is meant to be 9732 * called by the layout system and should not generally be called otherwise, because the 9733 * property may be changed at any time by the layout. 9734 * 9735 * @param bottom The bottom of this view, in pixels. 9736 */ 9737 public final void setBottom(int bottom) { 9738 if (bottom != mBottom) { 9739 updateMatrix(); 9740 final boolean matrixIsIdentity = mTransformationInfo == null 9741 || mTransformationInfo.mMatrixIsIdentity; 9742 if (matrixIsIdentity) { 9743 if (mAttachInfo != null) { 9744 int maxBottom; 9745 if (bottom < mBottom) { 9746 maxBottom = mBottom; 9747 } else { 9748 maxBottom = bottom; 9749 } 9750 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9751 } 9752 } else { 9753 // Double-invalidation is necessary to capture view's old and new areas 9754 invalidate(true); 9755 } 9756 9757 int width = mRight - mLeft; 9758 int oldHeight = mBottom - mTop; 9759 9760 mBottom = bottom; 9761 if (mDisplayList != null) { 9762 mDisplayList.setBottom(mBottom); 9763 } 9764 9765 sizeChange(width, mBottom - mTop, width, oldHeight); 9766 9767 if (!matrixIsIdentity) { 9768 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9769 // A change in dimension means an auto-centered pivot point changes, too 9770 mTransformationInfo.mMatrixDirty = true; 9771 } 9772 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9773 invalidate(true); 9774 } 9775 mBackgroundSizeChanged = true; 9776 invalidateParentIfNeeded(); 9777 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9778 // View was rejected last time it was drawn by its parent; this may have changed 9779 invalidateParentIfNeeded(); 9780 } 9781 } 9782 } 9783 9784 /** 9785 * Left position of this view relative to its parent. 9786 * 9787 * @return The left edge of this view, in pixels. 9788 */ 9789 @ViewDebug.CapturedViewProperty 9790 public final int getLeft() { 9791 return mLeft; 9792 } 9793 9794 /** 9795 * Sets the left position of this view relative to its parent. This method is meant to be called 9796 * by the layout system and should not generally be called otherwise, because the property 9797 * may be changed at any time by the layout. 9798 * 9799 * @param left The bottom of this view, in pixels. 9800 */ 9801 public final void setLeft(int left) { 9802 if (left != mLeft) { 9803 updateMatrix(); 9804 final boolean matrixIsIdentity = mTransformationInfo == null 9805 || mTransformationInfo.mMatrixIsIdentity; 9806 if (matrixIsIdentity) { 9807 if (mAttachInfo != null) { 9808 int minLeft; 9809 int xLoc; 9810 if (left < mLeft) { 9811 minLeft = left; 9812 xLoc = left - mLeft; 9813 } else { 9814 minLeft = mLeft; 9815 xLoc = 0; 9816 } 9817 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9818 } 9819 } else { 9820 // Double-invalidation is necessary to capture view's old and new areas 9821 invalidate(true); 9822 } 9823 9824 int oldWidth = mRight - mLeft; 9825 int height = mBottom - mTop; 9826 9827 mLeft = left; 9828 if (mDisplayList != null) { 9829 mDisplayList.setLeft(left); 9830 } 9831 9832 sizeChange(mRight - mLeft, height, oldWidth, height); 9833 9834 if (!matrixIsIdentity) { 9835 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9836 // A change in dimension means an auto-centered pivot point changes, too 9837 mTransformationInfo.mMatrixDirty = true; 9838 } 9839 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9840 invalidate(true); 9841 } 9842 mBackgroundSizeChanged = true; 9843 invalidateParentIfNeeded(); 9844 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9845 // View was rejected last time it was drawn by its parent; this may have changed 9846 invalidateParentIfNeeded(); 9847 } 9848 } 9849 } 9850 9851 /** 9852 * Right position of this view relative to its parent. 9853 * 9854 * @return The right edge of this view, in pixels. 9855 */ 9856 @ViewDebug.CapturedViewProperty 9857 public final int getRight() { 9858 return mRight; 9859 } 9860 9861 /** 9862 * Sets the right position of this view relative to its parent. This method is meant to be called 9863 * by the layout system and should not generally be called otherwise, because the property 9864 * may be changed at any time by the layout. 9865 * 9866 * @param right The bottom of this view, in pixels. 9867 */ 9868 public final void setRight(int right) { 9869 if (right != mRight) { 9870 updateMatrix(); 9871 final boolean matrixIsIdentity = mTransformationInfo == null 9872 || mTransformationInfo.mMatrixIsIdentity; 9873 if (matrixIsIdentity) { 9874 if (mAttachInfo != null) { 9875 int maxRight; 9876 if (right < mRight) { 9877 maxRight = mRight; 9878 } else { 9879 maxRight = right; 9880 } 9881 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9882 } 9883 } else { 9884 // Double-invalidation is necessary to capture view's old and new areas 9885 invalidate(true); 9886 } 9887 9888 int oldWidth = mRight - mLeft; 9889 int height = mBottom - mTop; 9890 9891 mRight = right; 9892 if (mDisplayList != null) { 9893 mDisplayList.setRight(mRight); 9894 } 9895 9896 sizeChange(mRight - mLeft, height, oldWidth, height); 9897 9898 if (!matrixIsIdentity) { 9899 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9900 // A change in dimension means an auto-centered pivot point changes, too 9901 mTransformationInfo.mMatrixDirty = true; 9902 } 9903 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9904 invalidate(true); 9905 } 9906 mBackgroundSizeChanged = true; 9907 invalidateParentIfNeeded(); 9908 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9909 // View was rejected last time it was drawn by its parent; this may have changed 9910 invalidateParentIfNeeded(); 9911 } 9912 } 9913 } 9914 9915 /** 9916 * The visual x position of this view, in pixels. This is equivalent to the 9917 * {@link #setTranslationX(float) translationX} property plus the current 9918 * {@link #getLeft() left} property. 9919 * 9920 * @return The visual x position of this view, in pixels. 9921 */ 9922 @ViewDebug.ExportedProperty(category = "drawing") 9923 public float getX() { 9924 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9925 } 9926 9927 /** 9928 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9929 * {@link #setTranslationX(float) translationX} property to be the difference between 9930 * the x value passed in and the current {@link #getLeft() left} property. 9931 * 9932 * @param x The visual x position of this view, in pixels. 9933 */ 9934 public void setX(float x) { 9935 setTranslationX(x - mLeft); 9936 } 9937 9938 /** 9939 * The visual y position of this view, in pixels. This is equivalent to the 9940 * {@link #setTranslationY(float) translationY} property plus the current 9941 * {@link #getTop() top} property. 9942 * 9943 * @return The visual y position of this view, in pixels. 9944 */ 9945 @ViewDebug.ExportedProperty(category = "drawing") 9946 public float getY() { 9947 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9948 } 9949 9950 /** 9951 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9952 * {@link #setTranslationY(float) translationY} property to be the difference between 9953 * the y value passed in and the current {@link #getTop() top} property. 9954 * 9955 * @param y The visual y position of this view, in pixels. 9956 */ 9957 public void setY(float y) { 9958 setTranslationY(y - mTop); 9959 } 9960 9961 9962 /** 9963 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9964 * This position is post-layout, in addition to wherever the object's 9965 * layout placed it. 9966 * 9967 * @return The horizontal position of this view relative to its left position, in pixels. 9968 */ 9969 @ViewDebug.ExportedProperty(category = "drawing") 9970 public float getTranslationX() { 9971 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9972 } 9973 9974 /** 9975 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9976 * This effectively positions the object post-layout, in addition to wherever the object's 9977 * layout placed it. 9978 * 9979 * @param translationX The horizontal position of this view relative to its left position, 9980 * in pixels. 9981 * 9982 * @attr ref android.R.styleable#View_translationX 9983 */ 9984 public void setTranslationX(float translationX) { 9985 ensureTransformationInfo(); 9986 final TransformationInfo info = mTransformationInfo; 9987 if (info.mTranslationX != translationX) { 9988 // Double-invalidation is necessary to capture view's old and new areas 9989 invalidateViewProperty(true, false); 9990 info.mTranslationX = translationX; 9991 info.mMatrixDirty = true; 9992 invalidateViewProperty(false, true); 9993 if (mDisplayList != null) { 9994 mDisplayList.setTranslationX(translationX); 9995 } 9996 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9997 // View was rejected last time it was drawn by its parent; this may have changed 9998 invalidateParentIfNeeded(); 9999 } 10000 } 10001 } 10002 10003 /** 10004 * The horizontal location of this view relative to its {@link #getTop() top} position. 10005 * This position is post-layout, in addition to wherever the object's 10006 * layout placed it. 10007 * 10008 * @return The vertical position of this view relative to its top position, 10009 * in pixels. 10010 */ 10011 @ViewDebug.ExportedProperty(category = "drawing") 10012 public float getTranslationY() { 10013 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 10014 } 10015 10016 /** 10017 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 10018 * This effectively positions the object post-layout, in addition to wherever the object's 10019 * layout placed it. 10020 * 10021 * @param translationY The vertical position of this view relative to its top position, 10022 * in pixels. 10023 * 10024 * @attr ref android.R.styleable#View_translationY 10025 */ 10026 public void setTranslationY(float translationY) { 10027 ensureTransformationInfo(); 10028 final TransformationInfo info = mTransformationInfo; 10029 if (info.mTranslationY != translationY) { 10030 invalidateViewProperty(true, false); 10031 info.mTranslationY = translationY; 10032 info.mMatrixDirty = true; 10033 invalidateViewProperty(false, true); 10034 if (mDisplayList != null) { 10035 mDisplayList.setTranslationY(translationY); 10036 } 10037 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10038 // View was rejected last time it was drawn by its parent; this may have changed 10039 invalidateParentIfNeeded(); 10040 } 10041 } 10042 } 10043 10044 /** 10045 * Hit rectangle in parent's coordinates 10046 * 10047 * @param outRect The hit rectangle of the view. 10048 */ 10049 public void getHitRect(Rect outRect) { 10050 updateMatrix(); 10051 final TransformationInfo info = mTransformationInfo; 10052 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 10053 outRect.set(mLeft, mTop, mRight, mBottom); 10054 } else { 10055 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 10056 tmpRect.set(0, 0, getWidth(), getHeight()); 10057 info.mMatrix.mapRect(tmpRect); 10058 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 10059 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 10060 } 10061 } 10062 10063 /** 10064 * Determines whether the given point, in local coordinates is inside the view. 10065 */ 10066 /*package*/ final boolean pointInView(float localX, float localY) { 10067 return localX >= 0 && localX < (mRight - mLeft) 10068 && localY >= 0 && localY < (mBottom - mTop); 10069 } 10070 10071 /** 10072 * Utility method to determine whether the given point, in local coordinates, 10073 * is inside the view, where the area of the view is expanded by the slop factor. 10074 * This method is called while processing touch-move events to determine if the event 10075 * is still within the view. 10076 * 10077 * @hide 10078 */ 10079 public boolean pointInView(float localX, float localY, float slop) { 10080 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 10081 localY < ((mBottom - mTop) + slop); 10082 } 10083 10084 /** 10085 * When a view has focus and the user navigates away from it, the next view is searched for 10086 * starting from the rectangle filled in by this method. 10087 * 10088 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 10089 * of the view. However, if your view maintains some idea of internal selection, 10090 * such as a cursor, or a selected row or column, you should override this method and 10091 * fill in a more specific rectangle. 10092 * 10093 * @param r The rectangle to fill in, in this view's coordinates. 10094 */ 10095 public void getFocusedRect(Rect r) { 10096 getDrawingRect(r); 10097 } 10098 10099 /** 10100 * If some part of this view is not clipped by any of its parents, then 10101 * return that area in r in global (root) coordinates. To convert r to local 10102 * coordinates (without taking possible View rotations into account), offset 10103 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 10104 * If the view is completely clipped or translated out, return false. 10105 * 10106 * @param r If true is returned, r holds the global coordinates of the 10107 * visible portion of this view. 10108 * @param globalOffset If true is returned, globalOffset holds the dx,dy 10109 * between this view and its root. globalOffet may be null. 10110 * @return true if r is non-empty (i.e. part of the view is visible at the 10111 * root level. 10112 */ 10113 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 10114 int width = mRight - mLeft; 10115 int height = mBottom - mTop; 10116 if (width > 0 && height > 0) { 10117 r.set(0, 0, width, height); 10118 if (globalOffset != null) { 10119 globalOffset.set(-mScrollX, -mScrollY); 10120 } 10121 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 10122 } 10123 return false; 10124 } 10125 10126 public final boolean getGlobalVisibleRect(Rect r) { 10127 return getGlobalVisibleRect(r, null); 10128 } 10129 10130 public final boolean getLocalVisibleRect(Rect r) { 10131 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 10132 if (getGlobalVisibleRect(r, offset)) { 10133 r.offset(-offset.x, -offset.y); // make r local 10134 return true; 10135 } 10136 return false; 10137 } 10138 10139 /** 10140 * Offset this view's vertical location by the specified number of pixels. 10141 * 10142 * @param offset the number of pixels to offset the view by 10143 */ 10144 public void offsetTopAndBottom(int offset) { 10145 if (offset != 0) { 10146 updateMatrix(); 10147 final boolean matrixIsIdentity = mTransformationInfo == null 10148 || mTransformationInfo.mMatrixIsIdentity; 10149 if (matrixIsIdentity) { 10150 if (mDisplayList != null) { 10151 invalidateViewProperty(false, false); 10152 } else { 10153 final ViewParent p = mParent; 10154 if (p != null && mAttachInfo != null) { 10155 final Rect r = mAttachInfo.mTmpInvalRect; 10156 int minTop; 10157 int maxBottom; 10158 int yLoc; 10159 if (offset < 0) { 10160 minTop = mTop + offset; 10161 maxBottom = mBottom; 10162 yLoc = offset; 10163 } else { 10164 minTop = mTop; 10165 maxBottom = mBottom + offset; 10166 yLoc = 0; 10167 } 10168 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 10169 p.invalidateChild(this, r); 10170 } 10171 } 10172 } else { 10173 invalidateViewProperty(false, false); 10174 } 10175 10176 mTop += offset; 10177 mBottom += offset; 10178 if (mDisplayList != null) { 10179 mDisplayList.offsetTopAndBottom(offset); 10180 invalidateViewProperty(false, false); 10181 } else { 10182 if (!matrixIsIdentity) { 10183 invalidateViewProperty(false, true); 10184 } 10185 invalidateParentIfNeeded(); 10186 } 10187 } 10188 } 10189 10190 /** 10191 * Offset this view's horizontal location by the specified amount of pixels. 10192 * 10193 * @param offset the number of pixels to offset the view by 10194 */ 10195 public void offsetLeftAndRight(int offset) { 10196 if (offset != 0) { 10197 updateMatrix(); 10198 final boolean matrixIsIdentity = mTransformationInfo == null 10199 || mTransformationInfo.mMatrixIsIdentity; 10200 if (matrixIsIdentity) { 10201 if (mDisplayList != null) { 10202 invalidateViewProperty(false, false); 10203 } else { 10204 final ViewParent p = mParent; 10205 if (p != null && mAttachInfo != null) { 10206 final Rect r = mAttachInfo.mTmpInvalRect; 10207 int minLeft; 10208 int maxRight; 10209 if (offset < 0) { 10210 minLeft = mLeft + offset; 10211 maxRight = mRight; 10212 } else { 10213 minLeft = mLeft; 10214 maxRight = mRight + offset; 10215 } 10216 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 10217 p.invalidateChild(this, r); 10218 } 10219 } 10220 } else { 10221 invalidateViewProperty(false, false); 10222 } 10223 10224 mLeft += offset; 10225 mRight += offset; 10226 if (mDisplayList != null) { 10227 mDisplayList.offsetLeftAndRight(offset); 10228 invalidateViewProperty(false, false); 10229 } else { 10230 if (!matrixIsIdentity) { 10231 invalidateViewProperty(false, true); 10232 } 10233 invalidateParentIfNeeded(); 10234 } 10235 } 10236 } 10237 10238 /** 10239 * Get the LayoutParams associated with this view. All views should have 10240 * layout parameters. These supply parameters to the <i>parent</i> of this 10241 * view specifying how it should be arranged. There are many subclasses of 10242 * ViewGroup.LayoutParams, and these correspond to the different subclasses 10243 * of ViewGroup that are responsible for arranging their children. 10244 * 10245 * This method may return null if this View is not attached to a parent 10246 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 10247 * was not invoked successfully. When a View is attached to a parent 10248 * ViewGroup, this method must not return null. 10249 * 10250 * @return The LayoutParams associated with this view, or null if no 10251 * parameters have been set yet 10252 */ 10253 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 10254 public ViewGroup.LayoutParams getLayoutParams() { 10255 return mLayoutParams; 10256 } 10257 10258 /** 10259 * Set the layout parameters associated with this view. These supply 10260 * parameters to the <i>parent</i> of this view specifying how it should be 10261 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 10262 * correspond to the different subclasses of ViewGroup that are responsible 10263 * for arranging their children. 10264 * 10265 * @param params The layout parameters for this view, cannot be null 10266 */ 10267 public void setLayoutParams(ViewGroup.LayoutParams params) { 10268 if (params == null) { 10269 throw new NullPointerException("Layout parameters cannot be null"); 10270 } 10271 mLayoutParams = params; 10272 resolveLayoutParams(); 10273 if (mParent instanceof ViewGroup) { 10274 ((ViewGroup) mParent).onSetLayoutParams(this, params); 10275 } 10276 requestLayout(); 10277 } 10278 10279 /** 10280 * Resolve the layout parameters depending on the resolved layout direction 10281 * 10282 * @hide 10283 */ 10284 public void resolveLayoutParams() { 10285 if (mLayoutParams != null) { 10286 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10287 } 10288 } 10289 10290 /** 10291 * Set the scrolled position of your view. This will cause a call to 10292 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10293 * invalidated. 10294 * @param x the x position to scroll to 10295 * @param y the y position to scroll to 10296 */ 10297 public void scrollTo(int x, int y) { 10298 if (mScrollX != x || mScrollY != y) { 10299 int oldX = mScrollX; 10300 int oldY = mScrollY; 10301 mScrollX = x; 10302 mScrollY = y; 10303 invalidateParentCaches(); 10304 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10305 if (!awakenScrollBars()) { 10306 postInvalidateOnAnimation(); 10307 } 10308 } 10309 } 10310 10311 /** 10312 * Move the scrolled position of your view. This will cause a call to 10313 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10314 * invalidated. 10315 * @param x the amount of pixels to scroll by horizontally 10316 * @param y the amount of pixels to scroll by vertically 10317 */ 10318 public void scrollBy(int x, int y) { 10319 scrollTo(mScrollX + x, mScrollY + y); 10320 } 10321 10322 /** 10323 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10324 * animation to fade the scrollbars out after a default delay. If a subclass 10325 * provides animated scrolling, the start delay should equal the duration 10326 * of the scrolling animation.</p> 10327 * 10328 * <p>The animation starts only if at least one of the scrollbars is 10329 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10330 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10331 * this method returns true, and false otherwise. If the animation is 10332 * started, this method calls {@link #invalidate()}; in that case the 10333 * caller should not call {@link #invalidate()}.</p> 10334 * 10335 * <p>This method should be invoked every time a subclass directly updates 10336 * the scroll parameters.</p> 10337 * 10338 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10339 * and {@link #scrollTo(int, int)}.</p> 10340 * 10341 * @return true if the animation is played, false otherwise 10342 * 10343 * @see #awakenScrollBars(int) 10344 * @see #scrollBy(int, int) 10345 * @see #scrollTo(int, int) 10346 * @see #isHorizontalScrollBarEnabled() 10347 * @see #isVerticalScrollBarEnabled() 10348 * @see #setHorizontalScrollBarEnabled(boolean) 10349 * @see #setVerticalScrollBarEnabled(boolean) 10350 */ 10351 protected boolean awakenScrollBars() { 10352 return mScrollCache != null && 10353 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10354 } 10355 10356 /** 10357 * Trigger the scrollbars to draw. 10358 * This method differs from awakenScrollBars() only in its default duration. 10359 * initialAwakenScrollBars() will show the scroll bars for longer than 10360 * usual to give the user more of a chance to notice them. 10361 * 10362 * @return true if the animation is played, false otherwise. 10363 */ 10364 private boolean initialAwakenScrollBars() { 10365 return mScrollCache != null && 10366 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10367 } 10368 10369 /** 10370 * <p> 10371 * Trigger the scrollbars to draw. When invoked this method starts an 10372 * animation to fade the scrollbars out after a fixed delay. If a subclass 10373 * provides animated scrolling, the start delay should equal the duration of 10374 * the scrolling animation. 10375 * </p> 10376 * 10377 * <p> 10378 * The animation starts only if at least one of the scrollbars is enabled, 10379 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10380 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10381 * this method returns true, and false otherwise. If the animation is 10382 * started, this method calls {@link #invalidate()}; in that case the caller 10383 * should not call {@link #invalidate()}. 10384 * </p> 10385 * 10386 * <p> 10387 * This method should be invoked everytime a subclass directly updates the 10388 * scroll parameters. 10389 * </p> 10390 * 10391 * @param startDelay the delay, in milliseconds, after which the animation 10392 * should start; when the delay is 0, the animation starts 10393 * immediately 10394 * @return true if the animation is played, false otherwise 10395 * 10396 * @see #scrollBy(int, int) 10397 * @see #scrollTo(int, int) 10398 * @see #isHorizontalScrollBarEnabled() 10399 * @see #isVerticalScrollBarEnabled() 10400 * @see #setHorizontalScrollBarEnabled(boolean) 10401 * @see #setVerticalScrollBarEnabled(boolean) 10402 */ 10403 protected boolean awakenScrollBars(int startDelay) { 10404 return awakenScrollBars(startDelay, true); 10405 } 10406 10407 /** 10408 * <p> 10409 * Trigger the scrollbars to draw. When invoked this method starts an 10410 * animation to fade the scrollbars out after a fixed delay. If a subclass 10411 * provides animated scrolling, the start delay should equal the duration of 10412 * the scrolling animation. 10413 * </p> 10414 * 10415 * <p> 10416 * The animation starts only if at least one of the scrollbars is enabled, 10417 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10418 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10419 * this method returns true, and false otherwise. If the animation is 10420 * started, this method calls {@link #invalidate()} if the invalidate parameter 10421 * is set to true; in that case the caller 10422 * should not call {@link #invalidate()}. 10423 * </p> 10424 * 10425 * <p> 10426 * This method should be invoked everytime a subclass directly updates the 10427 * scroll parameters. 10428 * </p> 10429 * 10430 * @param startDelay the delay, in milliseconds, after which the animation 10431 * should start; when the delay is 0, the animation starts 10432 * immediately 10433 * 10434 * @param invalidate Wheter this method should call invalidate 10435 * 10436 * @return true if the animation is played, false otherwise 10437 * 10438 * @see #scrollBy(int, int) 10439 * @see #scrollTo(int, int) 10440 * @see #isHorizontalScrollBarEnabled() 10441 * @see #isVerticalScrollBarEnabled() 10442 * @see #setHorizontalScrollBarEnabled(boolean) 10443 * @see #setVerticalScrollBarEnabled(boolean) 10444 */ 10445 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10446 final ScrollabilityCache scrollCache = mScrollCache; 10447 10448 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10449 return false; 10450 } 10451 10452 if (scrollCache.scrollBar == null) { 10453 scrollCache.scrollBar = new ScrollBarDrawable(); 10454 } 10455 10456 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10457 10458 if (invalidate) { 10459 // Invalidate to show the scrollbars 10460 postInvalidateOnAnimation(); 10461 } 10462 10463 if (scrollCache.state == ScrollabilityCache.OFF) { 10464 // FIXME: this is copied from WindowManagerService. 10465 // We should get this value from the system when it 10466 // is possible to do so. 10467 final int KEY_REPEAT_FIRST_DELAY = 750; 10468 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10469 } 10470 10471 // Tell mScrollCache when we should start fading. This may 10472 // extend the fade start time if one was already scheduled 10473 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10474 scrollCache.fadeStartTime = fadeStartTime; 10475 scrollCache.state = ScrollabilityCache.ON; 10476 10477 // Schedule our fader to run, unscheduling any old ones first 10478 if (mAttachInfo != null) { 10479 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10480 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10481 } 10482 10483 return true; 10484 } 10485 10486 return false; 10487 } 10488 10489 /** 10490 * Do not invalidate views which are not visible and which are not running an animation. They 10491 * will not get drawn and they should not set dirty flags as if they will be drawn 10492 */ 10493 private boolean skipInvalidate() { 10494 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10495 (!(mParent instanceof ViewGroup) || 10496 !((ViewGroup) mParent).isViewTransitioning(this)); 10497 } 10498 /** 10499 * Mark the area defined by dirty as needing to be drawn. If the view is 10500 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10501 * in the future. This must be called from a UI thread. To call from a non-UI 10502 * thread, call {@link #postInvalidate()}. 10503 * 10504 * WARNING: This method is destructive to dirty. 10505 * @param dirty the rectangle representing the bounds of the dirty region 10506 */ 10507 public void invalidate(Rect dirty) { 10508 if (skipInvalidate()) { 10509 return; 10510 } 10511 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10512 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10513 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10514 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10515 mPrivateFlags |= PFLAG_INVALIDATED; 10516 mPrivateFlags |= PFLAG_DIRTY; 10517 final ViewParent p = mParent; 10518 final AttachInfo ai = mAttachInfo; 10519 //noinspection PointlessBooleanExpression,ConstantConditions 10520 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10521 if (p != null && ai != null && ai.mHardwareAccelerated) { 10522 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10523 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10524 p.invalidateChild(this, null); 10525 return; 10526 } 10527 } 10528 if (p != null && ai != null) { 10529 final int scrollX = mScrollX; 10530 final int scrollY = mScrollY; 10531 final Rect r = ai.mTmpInvalRect; 10532 r.set(dirty.left - scrollX, dirty.top - scrollY, 10533 dirty.right - scrollX, dirty.bottom - scrollY); 10534 mParent.invalidateChild(this, r); 10535 } 10536 } 10537 } 10538 10539 /** 10540 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10541 * The coordinates of the dirty rect are relative to the view. 10542 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10543 * will be called at some point in the future. This must be called from 10544 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10545 * @param l the left position of the dirty region 10546 * @param t the top position of the dirty region 10547 * @param r the right position of the dirty region 10548 * @param b the bottom position of the dirty region 10549 */ 10550 public void invalidate(int l, int t, int r, int b) { 10551 if (skipInvalidate()) { 10552 return; 10553 } 10554 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10555 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10556 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10557 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10558 mPrivateFlags |= PFLAG_INVALIDATED; 10559 mPrivateFlags |= PFLAG_DIRTY; 10560 final ViewParent p = mParent; 10561 final AttachInfo ai = mAttachInfo; 10562 //noinspection PointlessBooleanExpression,ConstantConditions 10563 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10564 if (p != null && ai != null && ai.mHardwareAccelerated) { 10565 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10566 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10567 p.invalidateChild(this, null); 10568 return; 10569 } 10570 } 10571 if (p != null && ai != null && l < r && t < b) { 10572 final int scrollX = mScrollX; 10573 final int scrollY = mScrollY; 10574 final Rect tmpr = ai.mTmpInvalRect; 10575 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10576 p.invalidateChild(this, tmpr); 10577 } 10578 } 10579 } 10580 10581 /** 10582 * Invalidate the whole view. If the view is visible, 10583 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10584 * the future. This must be called from a UI thread. To call from a non-UI thread, 10585 * call {@link #postInvalidate()}. 10586 */ 10587 public void invalidate() { 10588 invalidate(true); 10589 } 10590 10591 /** 10592 * This is where the invalidate() work actually happens. A full invalidate() 10593 * causes the drawing cache to be invalidated, but this function can be called with 10594 * invalidateCache set to false to skip that invalidation step for cases that do not 10595 * need it (for example, a component that remains at the same dimensions with the same 10596 * content). 10597 * 10598 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10599 * well. This is usually true for a full invalidate, but may be set to false if the 10600 * View's contents or dimensions have not changed. 10601 */ 10602 void invalidate(boolean invalidateCache) { 10603 if (skipInvalidate()) { 10604 return; 10605 } 10606 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10607 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10608 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10609 mLastIsOpaque = isOpaque(); 10610 mPrivateFlags &= ~PFLAG_DRAWN; 10611 mPrivateFlags |= PFLAG_DIRTY; 10612 if (invalidateCache) { 10613 mPrivateFlags |= PFLAG_INVALIDATED; 10614 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10615 } 10616 final AttachInfo ai = mAttachInfo; 10617 final ViewParent p = mParent; 10618 //noinspection PointlessBooleanExpression,ConstantConditions 10619 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10620 if (p != null && ai != null && ai.mHardwareAccelerated) { 10621 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10622 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10623 p.invalidateChild(this, null); 10624 return; 10625 } 10626 } 10627 10628 if (p != null && ai != null) { 10629 final Rect r = ai.mTmpInvalRect; 10630 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10631 // Don't call invalidate -- we don't want to internally scroll 10632 // our own bounds 10633 p.invalidateChild(this, r); 10634 } 10635 } 10636 } 10637 10638 /** 10639 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10640 * set any flags or handle all of the cases handled by the default invalidation methods. 10641 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10642 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10643 * walk up the hierarchy, transforming the dirty rect as necessary. 10644 * 10645 * The method also handles normal invalidation logic if display list properties are not 10646 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10647 * backup approach, to handle these cases used in the various property-setting methods. 10648 * 10649 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10650 * are not being used in this view 10651 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10652 * list properties are not being used in this view 10653 */ 10654 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10655 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10656 if (invalidateParent) { 10657 invalidateParentCaches(); 10658 } 10659 if (forceRedraw) { 10660 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10661 } 10662 invalidate(false); 10663 } else { 10664 final AttachInfo ai = mAttachInfo; 10665 final ViewParent p = mParent; 10666 if (p != null && ai != null) { 10667 final Rect r = ai.mTmpInvalRect; 10668 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10669 if (mParent instanceof ViewGroup) { 10670 ((ViewGroup) mParent).invalidateChildFast(this, r); 10671 } else { 10672 mParent.invalidateChild(this, r); 10673 } 10674 } 10675 } 10676 } 10677 10678 /** 10679 * Utility method to transform a given Rect by the current matrix of this view. 10680 */ 10681 void transformRect(final Rect rect) { 10682 if (!getMatrix().isIdentity()) { 10683 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10684 boundingRect.set(rect); 10685 getMatrix().mapRect(boundingRect); 10686 rect.set((int) Math.floor(boundingRect.left), 10687 (int) Math.floor(boundingRect.top), 10688 (int) Math.ceil(boundingRect.right), 10689 (int) Math.ceil(boundingRect.bottom)); 10690 } 10691 } 10692 10693 /** 10694 * Used to indicate that the parent of this view should clear its caches. This functionality 10695 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10696 * which is necessary when various parent-managed properties of the view change, such as 10697 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10698 * clears the parent caches and does not causes an invalidate event. 10699 * 10700 * @hide 10701 */ 10702 protected void invalidateParentCaches() { 10703 if (mParent instanceof View) { 10704 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10705 } 10706 } 10707 10708 /** 10709 * Used to indicate that the parent of this view should be invalidated. This functionality 10710 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10711 * which is necessary when various parent-managed properties of the view change, such as 10712 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10713 * an invalidation event to the parent. 10714 * 10715 * @hide 10716 */ 10717 protected void invalidateParentIfNeeded() { 10718 if (isHardwareAccelerated() && mParent instanceof View) { 10719 ((View) mParent).invalidate(true); 10720 } 10721 } 10722 10723 /** 10724 * Indicates whether this View is opaque. An opaque View guarantees that it will 10725 * draw all the pixels overlapping its bounds using a fully opaque color. 10726 * 10727 * Subclasses of View should override this method whenever possible to indicate 10728 * whether an instance is opaque. Opaque Views are treated in a special way by 10729 * the View hierarchy, possibly allowing it to perform optimizations during 10730 * invalidate/draw passes. 10731 * 10732 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10733 */ 10734 @ViewDebug.ExportedProperty(category = "drawing") 10735 public boolean isOpaque() { 10736 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 10737 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10738 } 10739 10740 /** 10741 * @hide 10742 */ 10743 protected void computeOpaqueFlags() { 10744 // Opaque if: 10745 // - Has a background 10746 // - Background is opaque 10747 // - Doesn't have scrollbars or scrollbars overlay 10748 10749 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10750 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 10751 } else { 10752 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 10753 } 10754 10755 final int flags = mViewFlags; 10756 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10757 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || 10758 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { 10759 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 10760 } else { 10761 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 10762 } 10763 } 10764 10765 /** 10766 * @hide 10767 */ 10768 protected boolean hasOpaqueScrollbars() { 10769 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 10770 } 10771 10772 /** 10773 * @return A handler associated with the thread running the View. This 10774 * handler can be used to pump events in the UI events queue. 10775 */ 10776 public Handler getHandler() { 10777 final AttachInfo attachInfo = mAttachInfo; 10778 if (attachInfo != null) { 10779 return attachInfo.mHandler; 10780 } 10781 return null; 10782 } 10783 10784 /** 10785 * Gets the view root associated with the View. 10786 * @return The view root, or null if none. 10787 * @hide 10788 */ 10789 public ViewRootImpl getViewRootImpl() { 10790 if (mAttachInfo != null) { 10791 return mAttachInfo.mViewRootImpl; 10792 } 10793 return null; 10794 } 10795 10796 /** 10797 * <p>Causes the Runnable to be added to the message queue. 10798 * The runnable will be run on the user interface thread.</p> 10799 * 10800 * @param action The Runnable that will be executed. 10801 * 10802 * @return Returns true if the Runnable was successfully placed in to the 10803 * message queue. Returns false on failure, usually because the 10804 * looper processing the message queue is exiting. 10805 * 10806 * @see #postDelayed 10807 * @see #removeCallbacks 10808 */ 10809 public boolean post(Runnable action) { 10810 final AttachInfo attachInfo = mAttachInfo; 10811 if (attachInfo != null) { 10812 return attachInfo.mHandler.post(action); 10813 } 10814 // Assume that post will succeed later 10815 ViewRootImpl.getRunQueue().post(action); 10816 return true; 10817 } 10818 10819 /** 10820 * <p>Causes the Runnable to be added to the message queue, to be run 10821 * after the specified amount of time elapses. 10822 * The runnable will be run on the user interface thread.</p> 10823 * 10824 * @param action The Runnable that will be executed. 10825 * @param delayMillis The delay (in milliseconds) until the Runnable 10826 * will be executed. 10827 * 10828 * @return true if the Runnable was successfully placed in to the 10829 * message queue. Returns false on failure, usually because the 10830 * looper processing the message queue is exiting. Note that a 10831 * result of true does not mean the Runnable will be processed -- 10832 * if the looper is quit before the delivery time of the message 10833 * occurs then the message will be dropped. 10834 * 10835 * @see #post 10836 * @see #removeCallbacks 10837 */ 10838 public boolean postDelayed(Runnable action, long delayMillis) { 10839 final AttachInfo attachInfo = mAttachInfo; 10840 if (attachInfo != null) { 10841 return attachInfo.mHandler.postDelayed(action, delayMillis); 10842 } 10843 // Assume that post will succeed later 10844 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10845 return true; 10846 } 10847 10848 /** 10849 * <p>Causes the Runnable to execute on the next animation time step. 10850 * The runnable will be run on the user interface thread.</p> 10851 * 10852 * @param action The Runnable that will be executed. 10853 * 10854 * @see #postOnAnimationDelayed 10855 * @see #removeCallbacks 10856 */ 10857 public void postOnAnimation(Runnable action) { 10858 final AttachInfo attachInfo = mAttachInfo; 10859 if (attachInfo != null) { 10860 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10861 Choreographer.CALLBACK_ANIMATION, action, null); 10862 } else { 10863 // Assume that post will succeed later 10864 ViewRootImpl.getRunQueue().post(action); 10865 } 10866 } 10867 10868 /** 10869 * <p>Causes the Runnable to execute on the next animation time step, 10870 * after the specified amount of time elapses. 10871 * The runnable will be run on the user interface thread.</p> 10872 * 10873 * @param action The Runnable that will be executed. 10874 * @param delayMillis The delay (in milliseconds) until the Runnable 10875 * will be executed. 10876 * 10877 * @see #postOnAnimation 10878 * @see #removeCallbacks 10879 */ 10880 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10881 final AttachInfo attachInfo = mAttachInfo; 10882 if (attachInfo != null) { 10883 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10884 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10885 } else { 10886 // Assume that post will succeed later 10887 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10888 } 10889 } 10890 10891 /** 10892 * <p>Removes the specified Runnable from the message queue.</p> 10893 * 10894 * @param action The Runnable to remove from the message handling queue 10895 * 10896 * @return true if this view could ask the Handler to remove the Runnable, 10897 * false otherwise. When the returned value is true, the Runnable 10898 * may or may not have been actually removed from the message queue 10899 * (for instance, if the Runnable was not in the queue already.) 10900 * 10901 * @see #post 10902 * @see #postDelayed 10903 * @see #postOnAnimation 10904 * @see #postOnAnimationDelayed 10905 */ 10906 public boolean removeCallbacks(Runnable action) { 10907 if (action != null) { 10908 final AttachInfo attachInfo = mAttachInfo; 10909 if (attachInfo != null) { 10910 attachInfo.mHandler.removeCallbacks(action); 10911 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10912 Choreographer.CALLBACK_ANIMATION, action, null); 10913 } else { 10914 // Assume that post will succeed later 10915 ViewRootImpl.getRunQueue().removeCallbacks(action); 10916 } 10917 } 10918 return true; 10919 } 10920 10921 /** 10922 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10923 * Use this to invalidate the View from a non-UI thread.</p> 10924 * 10925 * <p>This method can be invoked from outside of the UI thread 10926 * only when this View is attached to a window.</p> 10927 * 10928 * @see #invalidate() 10929 * @see #postInvalidateDelayed(long) 10930 */ 10931 public void postInvalidate() { 10932 postInvalidateDelayed(0); 10933 } 10934 10935 /** 10936 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10937 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10938 * 10939 * <p>This method can be invoked from outside of the UI thread 10940 * only when this View is attached to a window.</p> 10941 * 10942 * @param left The left coordinate of the rectangle to invalidate. 10943 * @param top The top coordinate of the rectangle to invalidate. 10944 * @param right The right coordinate of the rectangle to invalidate. 10945 * @param bottom The bottom coordinate of the rectangle to invalidate. 10946 * 10947 * @see #invalidate(int, int, int, int) 10948 * @see #invalidate(Rect) 10949 * @see #postInvalidateDelayed(long, int, int, int, int) 10950 */ 10951 public void postInvalidate(int left, int top, int right, int bottom) { 10952 postInvalidateDelayed(0, left, top, right, bottom); 10953 } 10954 10955 /** 10956 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10957 * loop. Waits for the specified amount of time.</p> 10958 * 10959 * <p>This method can be invoked from outside of the UI thread 10960 * only when this View is attached to a window.</p> 10961 * 10962 * @param delayMilliseconds the duration in milliseconds to delay the 10963 * invalidation by 10964 * 10965 * @see #invalidate() 10966 * @see #postInvalidate() 10967 */ 10968 public void postInvalidateDelayed(long delayMilliseconds) { 10969 // We try only with the AttachInfo because there's no point in invalidating 10970 // if we are not attached to our window 10971 final AttachInfo attachInfo = mAttachInfo; 10972 if (attachInfo != null) { 10973 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10974 } 10975 } 10976 10977 /** 10978 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10979 * through the event loop. Waits for the specified amount of time.</p> 10980 * 10981 * <p>This method can be invoked from outside of the UI thread 10982 * only when this View is attached to a window.</p> 10983 * 10984 * @param delayMilliseconds the duration in milliseconds to delay the 10985 * invalidation by 10986 * @param left The left coordinate of the rectangle to invalidate. 10987 * @param top The top coordinate of the rectangle to invalidate. 10988 * @param right The right coordinate of the rectangle to invalidate. 10989 * @param bottom The bottom coordinate of the rectangle to invalidate. 10990 * 10991 * @see #invalidate(int, int, int, int) 10992 * @see #invalidate(Rect) 10993 * @see #postInvalidate(int, int, int, int) 10994 */ 10995 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10996 int right, int bottom) { 10997 10998 // We try only with the AttachInfo because there's no point in invalidating 10999 // if we are not attached to our window 11000 final AttachInfo attachInfo = mAttachInfo; 11001 if (attachInfo != null) { 11002 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11003 info.target = this; 11004 info.left = left; 11005 info.top = top; 11006 info.right = right; 11007 info.bottom = bottom; 11008 11009 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 11010 } 11011 } 11012 11013 /** 11014 * <p>Cause an invalidate to happen on the next animation time step, typically the 11015 * next display frame.</p> 11016 * 11017 * <p>This method can be invoked from outside of the UI thread 11018 * only when this View is attached to a window.</p> 11019 * 11020 * @see #invalidate() 11021 */ 11022 public void postInvalidateOnAnimation() { 11023 // We try only with the AttachInfo because there's no point in invalidating 11024 // if we are not attached to our window 11025 final AttachInfo attachInfo = mAttachInfo; 11026 if (attachInfo != null) { 11027 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 11028 } 11029 } 11030 11031 /** 11032 * <p>Cause an invalidate of the specified area to happen on the next animation 11033 * time step, typically the next display frame.</p> 11034 * 11035 * <p>This method can be invoked from outside of the UI thread 11036 * only when this View is attached to a window.</p> 11037 * 11038 * @param left The left coordinate of the rectangle to invalidate. 11039 * @param top The top coordinate of the rectangle to invalidate. 11040 * @param right The right coordinate of the rectangle to invalidate. 11041 * @param bottom The bottom coordinate of the rectangle to invalidate. 11042 * 11043 * @see #invalidate(int, int, int, int) 11044 * @see #invalidate(Rect) 11045 */ 11046 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 11047 // We try only with the AttachInfo because there's no point in invalidating 11048 // if we are not attached to our window 11049 final AttachInfo attachInfo = mAttachInfo; 11050 if (attachInfo != null) { 11051 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11052 info.target = this; 11053 info.left = left; 11054 info.top = top; 11055 info.right = right; 11056 info.bottom = bottom; 11057 11058 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 11059 } 11060 } 11061 11062 /** 11063 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 11064 * This event is sent at most once every 11065 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 11066 */ 11067 private void postSendViewScrolledAccessibilityEventCallback() { 11068 if (mSendViewScrolledAccessibilityEvent == null) { 11069 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 11070 } 11071 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 11072 mSendViewScrolledAccessibilityEvent.mIsPending = true; 11073 postDelayed(mSendViewScrolledAccessibilityEvent, 11074 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 11075 } 11076 } 11077 11078 /** 11079 * Called by a parent to request that a child update its values for mScrollX 11080 * and mScrollY if necessary. This will typically be done if the child is 11081 * animating a scroll using a {@link android.widget.Scroller Scroller} 11082 * object. 11083 */ 11084 public void computeScroll() { 11085 } 11086 11087 /** 11088 * <p>Indicate whether the horizontal edges are faded when the view is 11089 * scrolled horizontally.</p> 11090 * 11091 * @return true if the horizontal edges should are faded on scroll, false 11092 * otherwise 11093 * 11094 * @see #setHorizontalFadingEdgeEnabled(boolean) 11095 * 11096 * @attr ref android.R.styleable#View_requiresFadingEdge 11097 */ 11098 public boolean isHorizontalFadingEdgeEnabled() { 11099 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 11100 } 11101 11102 /** 11103 * <p>Define whether the horizontal edges should be faded when this view 11104 * is scrolled horizontally.</p> 11105 * 11106 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 11107 * be faded when the view is scrolled 11108 * horizontally 11109 * 11110 * @see #isHorizontalFadingEdgeEnabled() 11111 * 11112 * @attr ref android.R.styleable#View_requiresFadingEdge 11113 */ 11114 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 11115 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 11116 if (horizontalFadingEdgeEnabled) { 11117 initScrollCache(); 11118 } 11119 11120 mViewFlags ^= FADING_EDGE_HORIZONTAL; 11121 } 11122 } 11123 11124 /** 11125 * <p>Indicate whether the vertical edges are faded when the view is 11126 * scrolled horizontally.</p> 11127 * 11128 * @return true if the vertical edges should are faded on scroll, false 11129 * otherwise 11130 * 11131 * @see #setVerticalFadingEdgeEnabled(boolean) 11132 * 11133 * @attr ref android.R.styleable#View_requiresFadingEdge 11134 */ 11135 public boolean isVerticalFadingEdgeEnabled() { 11136 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 11137 } 11138 11139 /** 11140 * <p>Define whether the vertical edges should be faded when this view 11141 * is scrolled vertically.</p> 11142 * 11143 * @param verticalFadingEdgeEnabled true if the vertical edges should 11144 * be faded when the view is scrolled 11145 * vertically 11146 * 11147 * @see #isVerticalFadingEdgeEnabled() 11148 * 11149 * @attr ref android.R.styleable#View_requiresFadingEdge 11150 */ 11151 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 11152 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 11153 if (verticalFadingEdgeEnabled) { 11154 initScrollCache(); 11155 } 11156 11157 mViewFlags ^= FADING_EDGE_VERTICAL; 11158 } 11159 } 11160 11161 /** 11162 * Returns the strength, or intensity, of the top faded edge. The strength is 11163 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11164 * returns 0.0 or 1.0 but no value in between. 11165 * 11166 * Subclasses should override this method to provide a smoother fade transition 11167 * when scrolling occurs. 11168 * 11169 * @return the intensity of the top fade as a float between 0.0f and 1.0f 11170 */ 11171 protected float getTopFadingEdgeStrength() { 11172 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 11173 } 11174 11175 /** 11176 * Returns the strength, or intensity, of the bottom faded edge. The strength is 11177 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11178 * returns 0.0 or 1.0 but no value in between. 11179 * 11180 * Subclasses should override this method to provide a smoother fade transition 11181 * when scrolling occurs. 11182 * 11183 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 11184 */ 11185 protected float getBottomFadingEdgeStrength() { 11186 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 11187 computeVerticalScrollRange() ? 1.0f : 0.0f; 11188 } 11189 11190 /** 11191 * Returns the strength, or intensity, of the left faded edge. The strength is 11192 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11193 * returns 0.0 or 1.0 but no value in between. 11194 * 11195 * Subclasses should override this method to provide a smoother fade transition 11196 * when scrolling occurs. 11197 * 11198 * @return the intensity of the left fade as a float between 0.0f and 1.0f 11199 */ 11200 protected float getLeftFadingEdgeStrength() { 11201 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 11202 } 11203 11204 /** 11205 * Returns the strength, or intensity, of the right faded edge. The strength is 11206 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11207 * returns 0.0 or 1.0 but no value in between. 11208 * 11209 * Subclasses should override this method to provide a smoother fade transition 11210 * when scrolling occurs. 11211 * 11212 * @return the intensity of the right fade as a float between 0.0f and 1.0f 11213 */ 11214 protected float getRightFadingEdgeStrength() { 11215 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 11216 computeHorizontalScrollRange() ? 1.0f : 0.0f; 11217 } 11218 11219 /** 11220 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 11221 * scrollbar is not drawn by default.</p> 11222 * 11223 * @return true if the horizontal scrollbar should be painted, false 11224 * otherwise 11225 * 11226 * @see #setHorizontalScrollBarEnabled(boolean) 11227 */ 11228 public boolean isHorizontalScrollBarEnabled() { 11229 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11230 } 11231 11232 /** 11233 * <p>Define whether the horizontal scrollbar should be drawn or not. The 11234 * scrollbar is not drawn by default.</p> 11235 * 11236 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 11237 * be painted 11238 * 11239 * @see #isHorizontalScrollBarEnabled() 11240 */ 11241 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 11242 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 11243 mViewFlags ^= SCROLLBARS_HORIZONTAL; 11244 computeOpaqueFlags(); 11245 resolvePadding(); 11246 } 11247 } 11248 11249 /** 11250 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 11251 * scrollbar is not drawn by default.</p> 11252 * 11253 * @return true if the vertical scrollbar should be painted, false 11254 * otherwise 11255 * 11256 * @see #setVerticalScrollBarEnabled(boolean) 11257 */ 11258 public boolean isVerticalScrollBarEnabled() { 11259 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 11260 } 11261 11262 /** 11263 * <p>Define whether the vertical scrollbar should be drawn or not. The 11264 * scrollbar is not drawn by default.</p> 11265 * 11266 * @param verticalScrollBarEnabled true if the vertical scrollbar should 11267 * be painted 11268 * 11269 * @see #isVerticalScrollBarEnabled() 11270 */ 11271 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 11272 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 11273 mViewFlags ^= SCROLLBARS_VERTICAL; 11274 computeOpaqueFlags(); 11275 resolvePadding(); 11276 } 11277 } 11278 11279 /** 11280 * @hide 11281 */ 11282 protected void recomputePadding() { 11283 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11284 } 11285 11286 /** 11287 * Define whether scrollbars will fade when the view is not scrolling. 11288 * 11289 * @param fadeScrollbars wheter to enable fading 11290 * 11291 * @attr ref android.R.styleable#View_fadeScrollbars 11292 */ 11293 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11294 initScrollCache(); 11295 final ScrollabilityCache scrollabilityCache = mScrollCache; 11296 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11297 if (fadeScrollbars) { 11298 scrollabilityCache.state = ScrollabilityCache.OFF; 11299 } else { 11300 scrollabilityCache.state = ScrollabilityCache.ON; 11301 } 11302 } 11303 11304 /** 11305 * 11306 * Returns true if scrollbars will fade when this view is not scrolling 11307 * 11308 * @return true if scrollbar fading is enabled 11309 * 11310 * @attr ref android.R.styleable#View_fadeScrollbars 11311 */ 11312 public boolean isScrollbarFadingEnabled() { 11313 return mScrollCache != null && mScrollCache.fadeScrollBars; 11314 } 11315 11316 /** 11317 * 11318 * Returns the delay before scrollbars fade. 11319 * 11320 * @return the delay before scrollbars fade 11321 * 11322 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11323 */ 11324 public int getScrollBarDefaultDelayBeforeFade() { 11325 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11326 mScrollCache.scrollBarDefaultDelayBeforeFade; 11327 } 11328 11329 /** 11330 * Define the delay before scrollbars fade. 11331 * 11332 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11333 * 11334 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11335 */ 11336 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11337 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11338 } 11339 11340 /** 11341 * 11342 * Returns the scrollbar fade duration. 11343 * 11344 * @return the scrollbar fade duration 11345 * 11346 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11347 */ 11348 public int getScrollBarFadeDuration() { 11349 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11350 mScrollCache.scrollBarFadeDuration; 11351 } 11352 11353 /** 11354 * Define the scrollbar fade duration. 11355 * 11356 * @param scrollBarFadeDuration - the scrollbar fade duration 11357 * 11358 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11359 */ 11360 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11361 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11362 } 11363 11364 /** 11365 * 11366 * Returns the scrollbar size. 11367 * 11368 * @return the scrollbar size 11369 * 11370 * @attr ref android.R.styleable#View_scrollbarSize 11371 */ 11372 public int getScrollBarSize() { 11373 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11374 mScrollCache.scrollBarSize; 11375 } 11376 11377 /** 11378 * Define the scrollbar size. 11379 * 11380 * @param scrollBarSize - the scrollbar size 11381 * 11382 * @attr ref android.R.styleable#View_scrollbarSize 11383 */ 11384 public void setScrollBarSize(int scrollBarSize) { 11385 getScrollCache().scrollBarSize = scrollBarSize; 11386 } 11387 11388 /** 11389 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11390 * inset. When inset, they add to the padding of the view. And the scrollbars 11391 * can be drawn inside the padding area or on the edge of the view. For example, 11392 * if a view has a background drawable and you want to draw the scrollbars 11393 * inside the padding specified by the drawable, you can use 11394 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11395 * appear at the edge of the view, ignoring the padding, then you can use 11396 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11397 * @param style the style of the scrollbars. Should be one of 11398 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11399 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11400 * @see #SCROLLBARS_INSIDE_OVERLAY 11401 * @see #SCROLLBARS_INSIDE_INSET 11402 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11403 * @see #SCROLLBARS_OUTSIDE_INSET 11404 * 11405 * @attr ref android.R.styleable#View_scrollbarStyle 11406 */ 11407 public void setScrollBarStyle(int style) { 11408 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11409 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11410 computeOpaqueFlags(); 11411 resolvePadding(); 11412 } 11413 } 11414 11415 /** 11416 * <p>Returns the current scrollbar style.</p> 11417 * @return the current scrollbar style 11418 * @see #SCROLLBARS_INSIDE_OVERLAY 11419 * @see #SCROLLBARS_INSIDE_INSET 11420 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11421 * @see #SCROLLBARS_OUTSIDE_INSET 11422 * 11423 * @attr ref android.R.styleable#View_scrollbarStyle 11424 */ 11425 @ViewDebug.ExportedProperty(mapping = { 11426 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11427 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11428 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11429 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11430 }) 11431 public int getScrollBarStyle() { 11432 return mViewFlags & SCROLLBARS_STYLE_MASK; 11433 } 11434 11435 /** 11436 * <p>Compute the horizontal range that the horizontal scrollbar 11437 * represents.</p> 11438 * 11439 * <p>The range is expressed in arbitrary units that must be the same as the 11440 * units used by {@link #computeHorizontalScrollExtent()} and 11441 * {@link #computeHorizontalScrollOffset()}.</p> 11442 * 11443 * <p>The default range is the drawing width of this view.</p> 11444 * 11445 * @return the total horizontal range represented by the horizontal 11446 * scrollbar 11447 * 11448 * @see #computeHorizontalScrollExtent() 11449 * @see #computeHorizontalScrollOffset() 11450 * @see android.widget.ScrollBarDrawable 11451 */ 11452 protected int computeHorizontalScrollRange() { 11453 return getWidth(); 11454 } 11455 11456 /** 11457 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11458 * within the horizontal range. This value is used to compute the position 11459 * of the thumb within the scrollbar's track.</p> 11460 * 11461 * <p>The range is expressed in arbitrary units that must be the same as the 11462 * units used by {@link #computeHorizontalScrollRange()} and 11463 * {@link #computeHorizontalScrollExtent()}.</p> 11464 * 11465 * <p>The default offset is the scroll offset of this view.</p> 11466 * 11467 * @return the horizontal offset of the scrollbar's thumb 11468 * 11469 * @see #computeHorizontalScrollRange() 11470 * @see #computeHorizontalScrollExtent() 11471 * @see android.widget.ScrollBarDrawable 11472 */ 11473 protected int computeHorizontalScrollOffset() { 11474 return mScrollX; 11475 } 11476 11477 /** 11478 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11479 * within the horizontal range. This value is used to compute the length 11480 * of the thumb within the scrollbar's track.</p> 11481 * 11482 * <p>The range is expressed in arbitrary units that must be the same as the 11483 * units used by {@link #computeHorizontalScrollRange()} and 11484 * {@link #computeHorizontalScrollOffset()}.</p> 11485 * 11486 * <p>The default extent is the drawing width of this view.</p> 11487 * 11488 * @return the horizontal extent of the scrollbar's thumb 11489 * 11490 * @see #computeHorizontalScrollRange() 11491 * @see #computeHorizontalScrollOffset() 11492 * @see android.widget.ScrollBarDrawable 11493 */ 11494 protected int computeHorizontalScrollExtent() { 11495 return getWidth(); 11496 } 11497 11498 /** 11499 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11500 * 11501 * <p>The range is expressed in arbitrary units that must be the same as the 11502 * units used by {@link #computeVerticalScrollExtent()} and 11503 * {@link #computeVerticalScrollOffset()}.</p> 11504 * 11505 * @return the total vertical range represented by the vertical scrollbar 11506 * 11507 * <p>The default range is the drawing height of this view.</p> 11508 * 11509 * @see #computeVerticalScrollExtent() 11510 * @see #computeVerticalScrollOffset() 11511 * @see android.widget.ScrollBarDrawable 11512 */ 11513 protected int computeVerticalScrollRange() { 11514 return getHeight(); 11515 } 11516 11517 /** 11518 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11519 * within the horizontal range. This value is used to compute the position 11520 * of the thumb within the scrollbar's track.</p> 11521 * 11522 * <p>The range is expressed in arbitrary units that must be the same as the 11523 * units used by {@link #computeVerticalScrollRange()} and 11524 * {@link #computeVerticalScrollExtent()}.</p> 11525 * 11526 * <p>The default offset is the scroll offset of this view.</p> 11527 * 11528 * @return the vertical offset of the scrollbar's thumb 11529 * 11530 * @see #computeVerticalScrollRange() 11531 * @see #computeVerticalScrollExtent() 11532 * @see android.widget.ScrollBarDrawable 11533 */ 11534 protected int computeVerticalScrollOffset() { 11535 return mScrollY; 11536 } 11537 11538 /** 11539 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11540 * within the vertical range. This value is used to compute the length 11541 * of the thumb within the scrollbar's track.</p> 11542 * 11543 * <p>The range is expressed in arbitrary units that must be the same as the 11544 * units used by {@link #computeVerticalScrollRange()} and 11545 * {@link #computeVerticalScrollOffset()}.</p> 11546 * 11547 * <p>The default extent is the drawing height of this view.</p> 11548 * 11549 * @return the vertical extent of the scrollbar's thumb 11550 * 11551 * @see #computeVerticalScrollRange() 11552 * @see #computeVerticalScrollOffset() 11553 * @see android.widget.ScrollBarDrawable 11554 */ 11555 protected int computeVerticalScrollExtent() { 11556 return getHeight(); 11557 } 11558 11559 /** 11560 * Check if this view can be scrolled horizontally in a certain direction. 11561 * 11562 * @param direction Negative to check scrolling left, positive to check scrolling right. 11563 * @return true if this view can be scrolled in the specified direction, false otherwise. 11564 */ 11565 public boolean canScrollHorizontally(int direction) { 11566 final int offset = computeHorizontalScrollOffset(); 11567 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11568 if (range == 0) return false; 11569 if (direction < 0) { 11570 return offset > 0; 11571 } else { 11572 return offset < range - 1; 11573 } 11574 } 11575 11576 /** 11577 * Check if this view can be scrolled vertically in a certain direction. 11578 * 11579 * @param direction Negative to check scrolling up, positive to check scrolling down. 11580 * @return true if this view can be scrolled in the specified direction, false otherwise. 11581 */ 11582 public boolean canScrollVertically(int direction) { 11583 final int offset = computeVerticalScrollOffset(); 11584 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11585 if (range == 0) return false; 11586 if (direction < 0) { 11587 return offset > 0; 11588 } else { 11589 return offset < range - 1; 11590 } 11591 } 11592 11593 /** 11594 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11595 * scrollbars are painted only if they have been awakened first.</p> 11596 * 11597 * @param canvas the canvas on which to draw the scrollbars 11598 * 11599 * @see #awakenScrollBars(int) 11600 */ 11601 protected final void onDrawScrollBars(Canvas canvas) { 11602 // scrollbars are drawn only when the animation is running 11603 final ScrollabilityCache cache = mScrollCache; 11604 if (cache != null) { 11605 11606 int state = cache.state; 11607 11608 if (state == ScrollabilityCache.OFF) { 11609 return; 11610 } 11611 11612 boolean invalidate = false; 11613 11614 if (state == ScrollabilityCache.FADING) { 11615 // We're fading -- get our fade interpolation 11616 if (cache.interpolatorValues == null) { 11617 cache.interpolatorValues = new float[1]; 11618 } 11619 11620 float[] values = cache.interpolatorValues; 11621 11622 // Stops the animation if we're done 11623 if (cache.scrollBarInterpolator.timeToValues(values) == 11624 Interpolator.Result.FREEZE_END) { 11625 cache.state = ScrollabilityCache.OFF; 11626 } else { 11627 cache.scrollBar.setAlpha(Math.round(values[0])); 11628 } 11629 11630 // This will make the scroll bars inval themselves after 11631 // drawing. We only want this when we're fading so that 11632 // we prevent excessive redraws 11633 invalidate = true; 11634 } else { 11635 // We're just on -- but we may have been fading before so 11636 // reset alpha 11637 cache.scrollBar.setAlpha(255); 11638 } 11639 11640 11641 final int viewFlags = mViewFlags; 11642 11643 final boolean drawHorizontalScrollBar = 11644 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11645 final boolean drawVerticalScrollBar = 11646 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11647 && !isVerticalScrollBarHidden(); 11648 11649 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11650 final int width = mRight - mLeft; 11651 final int height = mBottom - mTop; 11652 11653 final ScrollBarDrawable scrollBar = cache.scrollBar; 11654 11655 final int scrollX = mScrollX; 11656 final int scrollY = mScrollY; 11657 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11658 11659 int left; 11660 int top; 11661 int right; 11662 int bottom; 11663 11664 if (drawHorizontalScrollBar) { 11665 int size = scrollBar.getSize(false); 11666 if (size <= 0) { 11667 size = cache.scrollBarSize; 11668 } 11669 11670 scrollBar.setParameters(computeHorizontalScrollRange(), 11671 computeHorizontalScrollOffset(), 11672 computeHorizontalScrollExtent(), false); 11673 final int verticalScrollBarGap = drawVerticalScrollBar ? 11674 getVerticalScrollbarWidth() : 0; 11675 top = scrollY + height - size - (mUserPaddingBottom & inside); 11676 left = scrollX + (mPaddingLeft & inside); 11677 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11678 bottom = top + size; 11679 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11680 if (invalidate) { 11681 invalidate(left, top, right, bottom); 11682 } 11683 } 11684 11685 if (drawVerticalScrollBar) { 11686 int size = scrollBar.getSize(true); 11687 if (size <= 0) { 11688 size = cache.scrollBarSize; 11689 } 11690 11691 scrollBar.setParameters(computeVerticalScrollRange(), 11692 computeVerticalScrollOffset(), 11693 computeVerticalScrollExtent(), true); 11694 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11695 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11696 verticalScrollbarPosition = isLayoutRtl() ? 11697 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11698 } 11699 switch (verticalScrollbarPosition) { 11700 default: 11701 case SCROLLBAR_POSITION_RIGHT: 11702 left = scrollX + width - size - (mUserPaddingRight & inside); 11703 break; 11704 case SCROLLBAR_POSITION_LEFT: 11705 left = scrollX + (mUserPaddingLeft & inside); 11706 break; 11707 } 11708 top = scrollY + (mPaddingTop & inside); 11709 right = left + size; 11710 bottom = scrollY + height - (mUserPaddingBottom & inside); 11711 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11712 if (invalidate) { 11713 invalidate(left, top, right, bottom); 11714 } 11715 } 11716 } 11717 } 11718 } 11719 11720 /** 11721 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11722 * FastScroller is visible. 11723 * @return whether to temporarily hide the vertical scrollbar 11724 * @hide 11725 */ 11726 protected boolean isVerticalScrollBarHidden() { 11727 return false; 11728 } 11729 11730 /** 11731 * <p>Draw the horizontal scrollbar if 11732 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11733 * 11734 * @param canvas the canvas on which to draw the scrollbar 11735 * @param scrollBar the scrollbar's drawable 11736 * 11737 * @see #isHorizontalScrollBarEnabled() 11738 * @see #computeHorizontalScrollRange() 11739 * @see #computeHorizontalScrollExtent() 11740 * @see #computeHorizontalScrollOffset() 11741 * @see android.widget.ScrollBarDrawable 11742 * @hide 11743 */ 11744 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11745 int l, int t, int r, int b) { 11746 scrollBar.setBounds(l, t, r, b); 11747 scrollBar.draw(canvas); 11748 } 11749 11750 /** 11751 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11752 * returns true.</p> 11753 * 11754 * @param canvas the canvas on which to draw the scrollbar 11755 * @param scrollBar the scrollbar's drawable 11756 * 11757 * @see #isVerticalScrollBarEnabled() 11758 * @see #computeVerticalScrollRange() 11759 * @see #computeVerticalScrollExtent() 11760 * @see #computeVerticalScrollOffset() 11761 * @see android.widget.ScrollBarDrawable 11762 * @hide 11763 */ 11764 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11765 int l, int t, int r, int b) { 11766 scrollBar.setBounds(l, t, r, b); 11767 scrollBar.draw(canvas); 11768 } 11769 11770 /** 11771 * Implement this to do your drawing. 11772 * 11773 * @param canvas the canvas on which the background will be drawn 11774 */ 11775 protected void onDraw(Canvas canvas) { 11776 } 11777 11778 /* 11779 * Caller is responsible for calling requestLayout if necessary. 11780 * (This allows addViewInLayout to not request a new layout.) 11781 */ 11782 void assignParent(ViewParent parent) { 11783 if (mParent == null) { 11784 mParent = parent; 11785 } else if (parent == null) { 11786 mParent = null; 11787 } else { 11788 throw new RuntimeException("view " + this + " being added, but" 11789 + " it already has a parent"); 11790 } 11791 } 11792 11793 /** 11794 * This is called when the view is attached to a window. At this point it 11795 * has a Surface and will start drawing. Note that this function is 11796 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11797 * however it may be called any time before the first onDraw -- including 11798 * before or after {@link #onMeasure(int, int)}. 11799 * 11800 * @see #onDetachedFromWindow() 11801 */ 11802 protected void onAttachedToWindow() { 11803 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 11804 mParent.requestTransparentRegion(this); 11805 } 11806 11807 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11808 initialAwakenScrollBars(); 11809 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 11810 } 11811 11812 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 11813 11814 jumpDrawablesToCurrentState(); 11815 11816 clearAccessibilityFocus(); 11817 resetSubtreeAccessibilityStateChanged(); 11818 11819 if (isFocused()) { 11820 InputMethodManager imm = InputMethodManager.peekInstance(); 11821 imm.focusIn(this); 11822 } 11823 11824 if (mDisplayList != null) { 11825 mDisplayList.clearDirty(); 11826 } 11827 } 11828 11829 /** 11830 * Resolve all RTL related properties. 11831 * 11832 * @return true if resolution of RTL properties has been done 11833 * 11834 * @hide 11835 */ 11836 public boolean resolveRtlPropertiesIfNeeded() { 11837 if (!needRtlPropertiesResolution()) return false; 11838 11839 // Order is important here: LayoutDirection MUST be resolved first 11840 if (!isLayoutDirectionResolved()) { 11841 resolveLayoutDirection(); 11842 resolveLayoutParams(); 11843 } 11844 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 11845 if (!isTextDirectionResolved()) { 11846 resolveTextDirection(); 11847 } 11848 if (!isTextAlignmentResolved()) { 11849 resolveTextAlignment(); 11850 } 11851 if (!isPaddingResolved()) { 11852 resolvePadding(); 11853 } 11854 if (!isDrawablesResolved()) { 11855 resolveDrawables(); 11856 } 11857 onRtlPropertiesChanged(getLayoutDirection()); 11858 return true; 11859 } 11860 11861 /** 11862 * Reset resolution of all RTL related properties. 11863 * 11864 * @hide 11865 */ 11866 public void resetRtlProperties() { 11867 resetResolvedLayoutDirection(); 11868 resetResolvedTextDirection(); 11869 resetResolvedTextAlignment(); 11870 resetResolvedPadding(); 11871 resetResolvedDrawables(); 11872 } 11873 11874 /** 11875 * @see #onScreenStateChanged(int) 11876 */ 11877 void dispatchScreenStateChanged(int screenState) { 11878 onScreenStateChanged(screenState); 11879 } 11880 11881 /** 11882 * This method is called whenever the state of the screen this view is 11883 * attached to changes. A state change will usually occurs when the screen 11884 * turns on or off (whether it happens automatically or the user does it 11885 * manually.) 11886 * 11887 * @param screenState The new state of the screen. Can be either 11888 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11889 */ 11890 public void onScreenStateChanged(int screenState) { 11891 } 11892 11893 /** 11894 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11895 */ 11896 private boolean hasRtlSupport() { 11897 return mContext.getApplicationInfo().hasRtlSupport(); 11898 } 11899 11900 /** 11901 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 11902 * RTL not supported) 11903 */ 11904 private boolean isRtlCompatibilityMode() { 11905 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 11906 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 11907 } 11908 11909 /** 11910 * @return true if RTL properties need resolution. 11911 * 11912 */ 11913 private boolean needRtlPropertiesResolution() { 11914 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 11915 } 11916 11917 /** 11918 * Called when any RTL property (layout direction or text direction or text alignment) has 11919 * been changed. 11920 * 11921 * Subclasses need to override this method to take care of cached information that depends on the 11922 * resolved layout direction, or to inform child views that inherit their layout direction. 11923 * 11924 * The default implementation does nothing. 11925 * 11926 * @param layoutDirection the direction of the layout 11927 * 11928 * @see #LAYOUT_DIRECTION_LTR 11929 * @see #LAYOUT_DIRECTION_RTL 11930 */ 11931 public void onRtlPropertiesChanged(int layoutDirection) { 11932 } 11933 11934 /** 11935 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11936 * that the parent directionality can and will be resolved before its children. 11937 * 11938 * @return true if resolution has been done, false otherwise. 11939 * 11940 * @hide 11941 */ 11942 public boolean resolveLayoutDirection() { 11943 // Clear any previous layout direction resolution 11944 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11945 11946 if (hasRtlSupport()) { 11947 // Set resolved depending on layout direction 11948 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 11949 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 11950 case LAYOUT_DIRECTION_INHERIT: 11951 // We cannot resolve yet. LTR is by default and let the resolution happen again 11952 // later to get the correct resolved value 11953 if (!canResolveLayoutDirection()) return false; 11954 11955 // Parent has not yet resolved, LTR is still the default 11956 try { 11957 if (!mParent.isLayoutDirectionResolved()) return false; 11958 11959 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11960 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11961 } 11962 } catch (AbstractMethodError e) { 11963 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 11964 " does not fully implement ViewParent", e); 11965 } 11966 break; 11967 case LAYOUT_DIRECTION_RTL: 11968 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11969 break; 11970 case LAYOUT_DIRECTION_LOCALE: 11971 if((LAYOUT_DIRECTION_RTL == 11972 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 11973 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11974 } 11975 break; 11976 default: 11977 // Nothing to do, LTR by default 11978 } 11979 } 11980 11981 // Set to resolved 11982 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11983 return true; 11984 } 11985 11986 /** 11987 * Check if layout direction resolution can be done. 11988 * 11989 * @return true if layout direction resolution can be done otherwise return false. 11990 */ 11991 public boolean canResolveLayoutDirection() { 11992 switch (getRawLayoutDirection()) { 11993 case LAYOUT_DIRECTION_INHERIT: 11994 if (mParent != null) { 11995 try { 11996 return mParent.canResolveLayoutDirection(); 11997 } catch (AbstractMethodError e) { 11998 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 11999 " does not fully implement ViewParent", e); 12000 } 12001 } 12002 return false; 12003 12004 default: 12005 return true; 12006 } 12007 } 12008 12009 /** 12010 * Reset the resolved layout direction. Layout direction will be resolved during a call to 12011 * {@link #onMeasure(int, int)}. 12012 * 12013 * @hide 12014 */ 12015 public void resetResolvedLayoutDirection() { 12016 // Reset the current resolved bits 12017 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 12018 } 12019 12020 /** 12021 * @return true if the layout direction is inherited. 12022 * 12023 * @hide 12024 */ 12025 public boolean isLayoutDirectionInherited() { 12026 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 12027 } 12028 12029 /** 12030 * @return true if layout direction has been resolved. 12031 */ 12032 public boolean isLayoutDirectionResolved() { 12033 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 12034 } 12035 12036 /** 12037 * Return if padding has been resolved 12038 * 12039 * @hide 12040 */ 12041 boolean isPaddingResolved() { 12042 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 12043 } 12044 12045 /** 12046 * Resolve padding depending on layout direction. 12047 * 12048 * @hide 12049 */ 12050 public void resolvePadding() { 12051 if (!isRtlCompatibilityMode()) { 12052 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 12053 // If start / end padding are defined, they will be resolved (hence overriding) to 12054 // left / right or right / left depending on the resolved layout direction. 12055 // If start / end padding are not defined, use the left / right ones. 12056 int resolvedLayoutDirection = getLayoutDirection(); 12057 switch (resolvedLayoutDirection) { 12058 case LAYOUT_DIRECTION_RTL: 12059 if (mUserPaddingStart != UNDEFINED_PADDING) { 12060 mUserPaddingRight = mUserPaddingStart; 12061 } else { 12062 mUserPaddingRight = mUserPaddingRightInitial; 12063 } 12064 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12065 mUserPaddingLeft = mUserPaddingEnd; 12066 } else { 12067 mUserPaddingLeft = mUserPaddingLeftInitial; 12068 } 12069 break; 12070 case LAYOUT_DIRECTION_LTR: 12071 default: 12072 if (mUserPaddingStart != UNDEFINED_PADDING) { 12073 mUserPaddingLeft = mUserPaddingStart; 12074 } else { 12075 mUserPaddingLeft = mUserPaddingLeftInitial; 12076 } 12077 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12078 mUserPaddingRight = mUserPaddingEnd; 12079 } else { 12080 mUserPaddingRight = mUserPaddingRightInitial; 12081 } 12082 } 12083 12084 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 12085 12086 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, 12087 mUserPaddingBottom); 12088 onRtlPropertiesChanged(resolvedLayoutDirection); 12089 } 12090 12091 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 12092 } 12093 12094 /** 12095 * Reset the resolved layout direction. 12096 * 12097 * @hide 12098 */ 12099 public void resetResolvedPadding() { 12100 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 12101 } 12102 12103 /** 12104 * This is called when the view is detached from a window. At this point it 12105 * no longer has a surface for drawing. 12106 * 12107 * @see #onAttachedToWindow() 12108 */ 12109 protected void onDetachedFromWindow() { 12110 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 12111 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 12112 12113 removeUnsetPressCallback(); 12114 removeLongPressCallback(); 12115 removePerformClickCallback(); 12116 removeSendViewScrolledAccessibilityEventCallback(); 12117 12118 destroyDrawingCache(); 12119 12120 destroyLayer(false); 12121 12122 cleanupDraw(); 12123 12124 mCurrentAnimation = null; 12125 mCurrentScene = null; 12126 } 12127 12128 private void cleanupDraw() { 12129 if (mAttachInfo != null) { 12130 if (mDisplayList != null) { 12131 mDisplayList.markDirty(); 12132 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 12133 } 12134 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 12135 } else { 12136 // Should never happen 12137 clearDisplayList(); 12138 } 12139 } 12140 12141 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 12142 } 12143 12144 /** 12145 * @return The number of times this view has been attached to a window 12146 */ 12147 protected int getWindowAttachCount() { 12148 return mWindowAttachCount; 12149 } 12150 12151 /** 12152 * Retrieve a unique token identifying the window this view is attached to. 12153 * @return Return the window's token for use in 12154 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 12155 */ 12156 public IBinder getWindowToken() { 12157 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 12158 } 12159 12160 /** 12161 * Retrieve the {@link WindowId} for the window this view is 12162 * currently attached to. 12163 */ 12164 public WindowId getWindowId() { 12165 if (mAttachInfo == null) { 12166 return null; 12167 } 12168 if (mAttachInfo.mWindowId == null) { 12169 try { 12170 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 12171 mAttachInfo.mWindowToken); 12172 mAttachInfo.mWindowId = new WindowId( 12173 mAttachInfo.mIWindowId); 12174 } catch (RemoteException e) { 12175 } 12176 } 12177 return mAttachInfo.mWindowId; 12178 } 12179 12180 /** 12181 * Retrieve a unique token identifying the top-level "real" window of 12182 * the window that this view is attached to. That is, this is like 12183 * {@link #getWindowToken}, except if the window this view in is a panel 12184 * window (attached to another containing window), then the token of 12185 * the containing window is returned instead. 12186 * 12187 * @return Returns the associated window token, either 12188 * {@link #getWindowToken()} or the containing window's token. 12189 */ 12190 public IBinder getApplicationWindowToken() { 12191 AttachInfo ai = mAttachInfo; 12192 if (ai != null) { 12193 IBinder appWindowToken = ai.mPanelParentWindowToken; 12194 if (appWindowToken == null) { 12195 appWindowToken = ai.mWindowToken; 12196 } 12197 return appWindowToken; 12198 } 12199 return null; 12200 } 12201 12202 /** 12203 * Gets the logical display to which the view's window has been attached. 12204 * 12205 * @return The logical display, or null if the view is not currently attached to a window. 12206 */ 12207 public Display getDisplay() { 12208 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 12209 } 12210 12211 /** 12212 * Retrieve private session object this view hierarchy is using to 12213 * communicate with the window manager. 12214 * @return the session object to communicate with the window manager 12215 */ 12216 /*package*/ IWindowSession getWindowSession() { 12217 return mAttachInfo != null ? mAttachInfo.mSession : null; 12218 } 12219 12220 /** 12221 * @param info the {@link android.view.View.AttachInfo} to associated with 12222 * this view 12223 */ 12224 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 12225 //System.out.println("Attached! " + this); 12226 mAttachInfo = info; 12227 if (mOverlay != null) { 12228 mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); 12229 } 12230 mWindowAttachCount++; 12231 // We will need to evaluate the drawable state at least once. 12232 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 12233 if (mFloatingTreeObserver != null) { 12234 info.mTreeObserver.merge(mFloatingTreeObserver); 12235 mFloatingTreeObserver = null; 12236 } 12237 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 12238 mAttachInfo.mScrollContainers.add(this); 12239 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 12240 } 12241 performCollectViewAttributes(mAttachInfo, visibility); 12242 onAttachedToWindow(); 12243 12244 ListenerInfo li = mListenerInfo; 12245 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12246 li != null ? li.mOnAttachStateChangeListeners : null; 12247 if (listeners != null && listeners.size() > 0) { 12248 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12249 // perform the dispatching. The iterator is a safe guard against listeners that 12250 // could mutate the list by calling the various add/remove methods. This prevents 12251 // the array from being modified while we iterate it. 12252 for (OnAttachStateChangeListener listener : listeners) { 12253 listener.onViewAttachedToWindow(this); 12254 } 12255 } 12256 12257 int vis = info.mWindowVisibility; 12258 if (vis != GONE) { 12259 onWindowVisibilityChanged(vis); 12260 } 12261 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 12262 // If nobody has evaluated the drawable state yet, then do it now. 12263 refreshDrawableState(); 12264 } 12265 needGlobalAttributesUpdate(false); 12266 } 12267 12268 void dispatchDetachedFromWindow() { 12269 AttachInfo info = mAttachInfo; 12270 if (info != null) { 12271 int vis = info.mWindowVisibility; 12272 if (vis != GONE) { 12273 onWindowVisibilityChanged(GONE); 12274 } 12275 } 12276 12277 onDetachedFromWindow(); 12278 12279 ListenerInfo li = mListenerInfo; 12280 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12281 li != null ? li.mOnAttachStateChangeListeners : null; 12282 if (listeners != null && listeners.size() > 0) { 12283 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12284 // perform the dispatching. The iterator is a safe guard against listeners that 12285 // could mutate the list by calling the various add/remove methods. This prevents 12286 // the array from being modified while we iterate it. 12287 for (OnAttachStateChangeListener listener : listeners) { 12288 listener.onViewDetachedFromWindow(this); 12289 } 12290 } 12291 12292 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 12293 mAttachInfo.mScrollContainers.remove(this); 12294 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 12295 } 12296 12297 mAttachInfo = null; 12298 if (mOverlay != null) { 12299 mOverlay.getOverlayView().dispatchDetachedFromWindow(); 12300 } 12301 } 12302 12303 /** 12304 * Store this view hierarchy's frozen state into the given container. 12305 * 12306 * @param container The SparseArray in which to save the view's state. 12307 * 12308 * @see #restoreHierarchyState(android.util.SparseArray) 12309 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12310 * @see #onSaveInstanceState() 12311 */ 12312 public void saveHierarchyState(SparseArray<Parcelable> container) { 12313 dispatchSaveInstanceState(container); 12314 } 12315 12316 /** 12317 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 12318 * this view and its children. May be overridden to modify how freezing happens to a 12319 * view's children; for example, some views may want to not store state for their children. 12320 * 12321 * @param container The SparseArray in which to save the view's state. 12322 * 12323 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12324 * @see #saveHierarchyState(android.util.SparseArray) 12325 * @see #onSaveInstanceState() 12326 */ 12327 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 12328 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 12329 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12330 Parcelable state = onSaveInstanceState(); 12331 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12332 throw new IllegalStateException( 12333 "Derived class did not call super.onSaveInstanceState()"); 12334 } 12335 if (state != null) { 12336 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12337 // + ": " + state); 12338 container.put(mID, state); 12339 } 12340 } 12341 } 12342 12343 /** 12344 * Hook allowing a view to generate a representation of its internal state 12345 * that can later be used to create a new instance with that same state. 12346 * This state should only contain information that is not persistent or can 12347 * not be reconstructed later. For example, you will never store your 12348 * current position on screen because that will be computed again when a 12349 * new instance of the view is placed in its view hierarchy. 12350 * <p> 12351 * Some examples of things you may store here: the current cursor position 12352 * in a text view (but usually not the text itself since that is stored in a 12353 * content provider or other persistent storage), the currently selected 12354 * item in a list view. 12355 * 12356 * @return Returns a Parcelable object containing the view's current dynamic 12357 * state, or null if there is nothing interesting to save. The 12358 * default implementation returns null. 12359 * @see #onRestoreInstanceState(android.os.Parcelable) 12360 * @see #saveHierarchyState(android.util.SparseArray) 12361 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12362 * @see #setSaveEnabled(boolean) 12363 */ 12364 protected Parcelable onSaveInstanceState() { 12365 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12366 return BaseSavedState.EMPTY_STATE; 12367 } 12368 12369 /** 12370 * Restore this view hierarchy's frozen state from the given container. 12371 * 12372 * @param container The SparseArray which holds previously frozen states. 12373 * 12374 * @see #saveHierarchyState(android.util.SparseArray) 12375 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12376 * @see #onRestoreInstanceState(android.os.Parcelable) 12377 */ 12378 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12379 dispatchRestoreInstanceState(container); 12380 } 12381 12382 /** 12383 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12384 * state for this view and its children. May be overridden to modify how restoring 12385 * happens to a view's children; for example, some views may want to not store state 12386 * for their children. 12387 * 12388 * @param container The SparseArray which holds previously saved state. 12389 * 12390 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12391 * @see #restoreHierarchyState(android.util.SparseArray) 12392 * @see #onRestoreInstanceState(android.os.Parcelable) 12393 */ 12394 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12395 if (mID != NO_ID) { 12396 Parcelable state = container.get(mID); 12397 if (state != null) { 12398 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12399 // + ": " + state); 12400 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12401 onRestoreInstanceState(state); 12402 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12403 throw new IllegalStateException( 12404 "Derived class did not call super.onRestoreInstanceState()"); 12405 } 12406 } 12407 } 12408 } 12409 12410 /** 12411 * Hook allowing a view to re-apply a representation of its internal state that had previously 12412 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12413 * null state. 12414 * 12415 * @param state The frozen state that had previously been returned by 12416 * {@link #onSaveInstanceState}. 12417 * 12418 * @see #onSaveInstanceState() 12419 * @see #restoreHierarchyState(android.util.SparseArray) 12420 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12421 */ 12422 protected void onRestoreInstanceState(Parcelable state) { 12423 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12424 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12425 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12426 + "received " + state.getClass().toString() + " instead. This usually happens " 12427 + "when two views of different type have the same id in the same hierarchy. " 12428 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12429 + "other views do not use the same id."); 12430 } 12431 } 12432 12433 /** 12434 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12435 * 12436 * @return the drawing start time in milliseconds 12437 */ 12438 public long getDrawingTime() { 12439 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12440 } 12441 12442 /** 12443 * <p>Enables or disables the duplication of the parent's state into this view. When 12444 * duplication is enabled, this view gets its drawable state from its parent rather 12445 * than from its own internal properties.</p> 12446 * 12447 * <p>Note: in the current implementation, setting this property to true after the 12448 * view was added to a ViewGroup might have no effect at all. This property should 12449 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12450 * 12451 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12452 * property is enabled, an exception will be thrown.</p> 12453 * 12454 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12455 * parent, these states should not be affected by this method.</p> 12456 * 12457 * @param enabled True to enable duplication of the parent's drawable state, false 12458 * to disable it. 12459 * 12460 * @see #getDrawableState() 12461 * @see #isDuplicateParentStateEnabled() 12462 */ 12463 public void setDuplicateParentStateEnabled(boolean enabled) { 12464 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12465 } 12466 12467 /** 12468 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12469 * 12470 * @return True if this view's drawable state is duplicated from the parent, 12471 * false otherwise 12472 * 12473 * @see #getDrawableState() 12474 * @see #setDuplicateParentStateEnabled(boolean) 12475 */ 12476 public boolean isDuplicateParentStateEnabled() { 12477 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12478 } 12479 12480 /** 12481 * <p>Specifies the type of layer backing this view. The layer can be 12482 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12483 * {@link #LAYER_TYPE_HARDWARE}.</p> 12484 * 12485 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12486 * instance that controls how the layer is composed on screen. The following 12487 * properties of the paint are taken into account when composing the layer:</p> 12488 * <ul> 12489 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12490 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12491 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12492 * </ul> 12493 * 12494 * <p>If this view has an alpha value set to < 1.0 by calling 12495 * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded 12496 * by this view's alpha value.</p> 12497 * 12498 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE}, 12499 * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} 12500 * for more information on when and how to use layers.</p> 12501 * 12502 * @param layerType The type of layer to use with this view, must be one of 12503 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12504 * {@link #LAYER_TYPE_HARDWARE} 12505 * @param paint The paint used to compose the layer. This argument is optional 12506 * and can be null. It is ignored when the layer type is 12507 * {@link #LAYER_TYPE_NONE} 12508 * 12509 * @see #getLayerType() 12510 * @see #LAYER_TYPE_NONE 12511 * @see #LAYER_TYPE_SOFTWARE 12512 * @see #LAYER_TYPE_HARDWARE 12513 * @see #setAlpha(float) 12514 * 12515 * @attr ref android.R.styleable#View_layerType 12516 */ 12517 public void setLayerType(int layerType, Paint paint) { 12518 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12519 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12520 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12521 } 12522 12523 if (layerType == mLayerType) { 12524 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12525 mLayerPaint = paint == null ? new Paint() : paint; 12526 invalidateParentCaches(); 12527 invalidate(true); 12528 } 12529 return; 12530 } 12531 12532 // Destroy any previous software drawing cache if needed 12533 switch (mLayerType) { 12534 case LAYER_TYPE_HARDWARE: 12535 destroyLayer(false); 12536 // fall through - non-accelerated views may use software layer mechanism instead 12537 case LAYER_TYPE_SOFTWARE: 12538 destroyDrawingCache(); 12539 break; 12540 default: 12541 break; 12542 } 12543 12544 mLayerType = layerType; 12545 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12546 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12547 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12548 12549 invalidateParentCaches(); 12550 invalidate(true); 12551 } 12552 12553 /** 12554 * Updates the {@link Paint} object used with the current layer (used only if the current 12555 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12556 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12557 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12558 * ensure that the view gets redrawn immediately. 12559 * 12560 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12561 * instance that controls how the layer is composed on screen. The following 12562 * properties of the paint are taken into account when composing the layer:</p> 12563 * <ul> 12564 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12565 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12566 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12567 * </ul> 12568 * 12569 * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the 12570 * alpha value of the layer's paint is superceded by this view's alpha value.</p> 12571 * 12572 * @param paint The paint used to compose the layer. This argument is optional 12573 * and can be null. It is ignored when the layer type is 12574 * {@link #LAYER_TYPE_NONE} 12575 * 12576 * @see #setLayerType(int, android.graphics.Paint) 12577 */ 12578 public void setLayerPaint(Paint paint) { 12579 int layerType = getLayerType(); 12580 if (layerType != LAYER_TYPE_NONE) { 12581 mLayerPaint = paint == null ? new Paint() : paint; 12582 if (layerType == LAYER_TYPE_HARDWARE) { 12583 HardwareLayer layer = getHardwareLayer(); 12584 if (layer != null) { 12585 layer.setLayerPaint(paint); 12586 } 12587 invalidateViewProperty(false, false); 12588 } else { 12589 invalidate(); 12590 } 12591 } 12592 } 12593 12594 /** 12595 * Indicates whether this view has a static layer. A view with layer type 12596 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12597 * dynamic. 12598 */ 12599 boolean hasStaticLayer() { 12600 return true; 12601 } 12602 12603 /** 12604 * Indicates what type of layer is currently associated with this view. By default 12605 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12606 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12607 * for more information on the different types of layers. 12608 * 12609 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12610 * {@link #LAYER_TYPE_HARDWARE} 12611 * 12612 * @see #setLayerType(int, android.graphics.Paint) 12613 * @see #buildLayer() 12614 * @see #LAYER_TYPE_NONE 12615 * @see #LAYER_TYPE_SOFTWARE 12616 * @see #LAYER_TYPE_HARDWARE 12617 */ 12618 public int getLayerType() { 12619 return mLayerType; 12620 } 12621 12622 /** 12623 * Forces this view's layer to be created and this view to be rendered 12624 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 12625 * invoking this method will have no effect. 12626 * 12627 * This method can for instance be used to render a view into its layer before 12628 * starting an animation. If this view is complex, rendering into the layer 12629 * before starting the animation will avoid skipping frames. 12630 * 12631 * @throws IllegalStateException If this view is not attached to a window 12632 * 12633 * @see #setLayerType(int, android.graphics.Paint) 12634 */ 12635 public void buildLayer() { 12636 if (mLayerType == LAYER_TYPE_NONE) return; 12637 12638 final AttachInfo attachInfo = mAttachInfo; 12639 if (attachInfo == null) { 12640 throw new IllegalStateException("This view must be attached to a window first"); 12641 } 12642 12643 switch (mLayerType) { 12644 case LAYER_TYPE_HARDWARE: 12645 if (attachInfo.mHardwareRenderer != null && 12646 attachInfo.mHardwareRenderer.isEnabled() && 12647 attachInfo.mHardwareRenderer.validate()) { 12648 getHardwareLayer(); 12649 // TODO: We need a better way to handle this case 12650 // If views have registered pre-draw listeners they need 12651 // to be notified before we build the layer. Those listeners 12652 // may however rely on other events to happen first so we 12653 // cannot just invoke them here until they don't cancel the 12654 // current frame 12655 if (!attachInfo.mTreeObserver.hasOnPreDrawListeners()) { 12656 attachInfo.mViewRootImpl.dispatchFlushHardwareLayerUpdates(); 12657 } 12658 } 12659 break; 12660 case LAYER_TYPE_SOFTWARE: 12661 buildDrawingCache(true); 12662 break; 12663 } 12664 } 12665 12666 /** 12667 * <p>Returns a hardware layer that can be used to draw this view again 12668 * without executing its draw method.</p> 12669 * 12670 * @return A HardwareLayer ready to render, or null if an error occurred. 12671 */ 12672 HardwareLayer getHardwareLayer() { 12673 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 12674 !mAttachInfo.mHardwareRenderer.isEnabled()) { 12675 return null; 12676 } 12677 12678 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 12679 12680 final int width = mRight - mLeft; 12681 final int height = mBottom - mTop; 12682 12683 if (width == 0 || height == 0) { 12684 return null; 12685 } 12686 12687 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 12688 if (mHardwareLayer == null) { 12689 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 12690 width, height, isOpaque()); 12691 mLocalDirtyRect.set(0, 0, width, height); 12692 } else { 12693 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 12694 if (mHardwareLayer.resize(width, height)) { 12695 mLocalDirtyRect.set(0, 0, width, height); 12696 } 12697 } 12698 12699 // This should not be necessary but applications that change 12700 // the parameters of their background drawable without calling 12701 // this.setBackground(Drawable) can leave the view in a bad state 12702 // (for instance isOpaque() returns true, but the background is 12703 // not opaque.) 12704 computeOpaqueFlags(); 12705 12706 final boolean opaque = isOpaque(); 12707 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 12708 mHardwareLayer.setOpaque(opaque); 12709 mLocalDirtyRect.set(0, 0, width, height); 12710 } 12711 } 12712 12713 // The layer is not valid if the underlying GPU resources cannot be allocated 12714 if (!mHardwareLayer.isValid()) { 12715 return null; 12716 } 12717 12718 mHardwareLayer.setLayerPaint(mLayerPaint); 12719 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 12720 ViewRootImpl viewRoot = getViewRootImpl(); 12721 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 12722 12723 mLocalDirtyRect.setEmpty(); 12724 } 12725 12726 return mHardwareLayer; 12727 } 12728 12729 /** 12730 * Destroys this View's hardware layer if possible. 12731 * 12732 * @return True if the layer was destroyed, false otherwise. 12733 * 12734 * @see #setLayerType(int, android.graphics.Paint) 12735 * @see #LAYER_TYPE_HARDWARE 12736 */ 12737 boolean destroyLayer(boolean valid) { 12738 if (mHardwareLayer != null) { 12739 AttachInfo info = mAttachInfo; 12740 if (info != null && info.mHardwareRenderer != null && 12741 info.mHardwareRenderer.isEnabled() && 12742 (valid || info.mHardwareRenderer.validate())) { 12743 12744 info.mHardwareRenderer.cancelLayerUpdate(mHardwareLayer); 12745 mHardwareLayer.destroy(); 12746 mHardwareLayer = null; 12747 12748 if (mDisplayList != null) { 12749 mDisplayList.reset(); 12750 } 12751 invalidate(true); 12752 invalidateParentCaches(); 12753 } 12754 return true; 12755 } 12756 return false; 12757 } 12758 12759 /** 12760 * Destroys all hardware rendering resources. This method is invoked 12761 * when the system needs to reclaim resources. Upon execution of this 12762 * method, you should free any OpenGL resources created by the view. 12763 * 12764 * Note: you <strong>must</strong> call 12765 * <code>super.destroyHardwareResources()</code> when overriding 12766 * this method. 12767 * 12768 * @hide 12769 */ 12770 protected void destroyHardwareResources() { 12771 clearDisplayList(); 12772 destroyLayer(true); 12773 } 12774 12775 /** 12776 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12777 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12778 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12779 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12780 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12781 * null.</p> 12782 * 12783 * <p>Enabling the drawing cache is similar to 12784 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12785 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12786 * drawing cache has no effect on rendering because the system uses a different mechanism 12787 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12788 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12789 * for information on how to enable software and hardware layers.</p> 12790 * 12791 * <p>This API can be used to manually generate 12792 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12793 * {@link #getDrawingCache()}.</p> 12794 * 12795 * @param enabled true to enable the drawing cache, false otherwise 12796 * 12797 * @see #isDrawingCacheEnabled() 12798 * @see #getDrawingCache() 12799 * @see #buildDrawingCache() 12800 * @see #setLayerType(int, android.graphics.Paint) 12801 */ 12802 public void setDrawingCacheEnabled(boolean enabled) { 12803 mCachingFailed = false; 12804 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12805 } 12806 12807 /** 12808 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12809 * 12810 * @return true if the drawing cache is enabled 12811 * 12812 * @see #setDrawingCacheEnabled(boolean) 12813 * @see #getDrawingCache() 12814 */ 12815 @ViewDebug.ExportedProperty(category = "drawing") 12816 public boolean isDrawingCacheEnabled() { 12817 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12818 } 12819 12820 /** 12821 * Debugging utility which recursively outputs the dirty state of a view and its 12822 * descendants. 12823 * 12824 * @hide 12825 */ 12826 @SuppressWarnings({"UnusedDeclaration"}) 12827 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12828 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 12829 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 12830 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 12831 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 12832 if (clear) { 12833 mPrivateFlags &= clearMask; 12834 } 12835 if (this instanceof ViewGroup) { 12836 ViewGroup parent = (ViewGroup) this; 12837 final int count = parent.getChildCount(); 12838 for (int i = 0; i < count; i++) { 12839 final View child = parent.getChildAt(i); 12840 child.outputDirtyFlags(indent + " ", clear, clearMask); 12841 } 12842 } 12843 } 12844 12845 /** 12846 * This method is used by ViewGroup to cause its children to restore or recreate their 12847 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12848 * to recreate its own display list, which would happen if it went through the normal 12849 * draw/dispatchDraw mechanisms. 12850 * 12851 * @hide 12852 */ 12853 protected void dispatchGetDisplayList() {} 12854 12855 /** 12856 * A view that is not attached or hardware accelerated cannot create a display list. 12857 * This method checks these conditions and returns the appropriate result. 12858 * 12859 * @return true if view has the ability to create a display list, false otherwise. 12860 * 12861 * @hide 12862 */ 12863 public boolean canHaveDisplayList() { 12864 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12865 } 12866 12867 /** 12868 * @return The {@link HardwareRenderer} associated with that view or null if 12869 * hardware rendering is not supported or this view is not attached 12870 * to a window. 12871 * 12872 * @hide 12873 */ 12874 public HardwareRenderer getHardwareRenderer() { 12875 if (mAttachInfo != null) { 12876 return mAttachInfo.mHardwareRenderer; 12877 } 12878 return null; 12879 } 12880 12881 /** 12882 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12883 * Otherwise, the same display list will be returned (after having been rendered into 12884 * along the way, depending on the invalidation state of the view). 12885 * 12886 * @param displayList The previous version of this displayList, could be null. 12887 * @param isLayer Whether the requester of the display list is a layer. If so, 12888 * the view will avoid creating a layer inside the resulting display list. 12889 * @return A new or reused DisplayList object. 12890 */ 12891 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12892 if (!canHaveDisplayList()) { 12893 return null; 12894 } 12895 12896 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 12897 displayList == null || !displayList.isValid() || 12898 (!isLayer && mRecreateDisplayList))) { 12899 // Don't need to recreate the display list, just need to tell our 12900 // children to restore/recreate theirs 12901 if (displayList != null && displayList.isValid() && 12902 !isLayer && !mRecreateDisplayList) { 12903 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12904 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12905 dispatchGetDisplayList(); 12906 12907 return displayList; 12908 } 12909 12910 if (!isLayer) { 12911 // If we got here, we're recreating it. Mark it as such to ensure that 12912 // we copy in child display lists into ours in drawChild() 12913 mRecreateDisplayList = true; 12914 } 12915 if (displayList == null) { 12916 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(getClass().getName()); 12917 // If we're creating a new display list, make sure our parent gets invalidated 12918 // since they will need to recreate their display list to account for this 12919 // new child display list. 12920 invalidateParentCaches(); 12921 } 12922 12923 boolean caching = false; 12924 int width = mRight - mLeft; 12925 int height = mBottom - mTop; 12926 int layerType = getLayerType(); 12927 12928 final HardwareCanvas canvas = displayList.start(width, height); 12929 12930 try { 12931 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12932 if (layerType == LAYER_TYPE_HARDWARE) { 12933 final HardwareLayer layer = getHardwareLayer(); 12934 if (layer != null && layer.isValid()) { 12935 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12936 } else { 12937 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12938 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12939 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12940 } 12941 caching = true; 12942 } else { 12943 buildDrawingCache(true); 12944 Bitmap cache = getDrawingCache(true); 12945 if (cache != null) { 12946 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12947 caching = true; 12948 } 12949 } 12950 } else { 12951 12952 computeScroll(); 12953 12954 canvas.translate(-mScrollX, -mScrollY); 12955 if (!isLayer) { 12956 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12957 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12958 } 12959 12960 // Fast path for layouts with no backgrounds 12961 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 12962 dispatchDraw(canvas); 12963 if (mOverlay != null && !mOverlay.isEmpty()) { 12964 mOverlay.getOverlayView().draw(canvas); 12965 } 12966 } else { 12967 draw(canvas); 12968 } 12969 } 12970 } finally { 12971 displayList.end(); 12972 displayList.setCaching(caching); 12973 if (isLayer) { 12974 displayList.setLeftTopRightBottom(0, 0, width, height); 12975 } else { 12976 setDisplayListProperties(displayList); 12977 } 12978 } 12979 } else if (!isLayer) { 12980 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12981 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12982 } 12983 12984 return displayList; 12985 } 12986 12987 /** 12988 * Get the DisplayList for the HardwareLayer 12989 * 12990 * @param layer The HardwareLayer whose DisplayList we want 12991 * @return A DisplayList fopr the specified HardwareLayer 12992 */ 12993 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12994 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12995 layer.setDisplayList(displayList); 12996 return displayList; 12997 } 12998 12999 13000 /** 13001 * <p>Returns a display list that can be used to draw this view again 13002 * without executing its draw method.</p> 13003 * 13004 * @return A DisplayList ready to replay, or null if caching is not enabled. 13005 * 13006 * @hide 13007 */ 13008 public DisplayList getDisplayList() { 13009 mDisplayList = getDisplayList(mDisplayList, false); 13010 return mDisplayList; 13011 } 13012 13013 private void clearDisplayList() { 13014 if (mDisplayList != null) { 13015 mDisplayList.clear(); 13016 } 13017 } 13018 13019 /** 13020 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 13021 * 13022 * @return A non-scaled bitmap representing this view or null if cache is disabled. 13023 * 13024 * @see #getDrawingCache(boolean) 13025 */ 13026 public Bitmap getDrawingCache() { 13027 return getDrawingCache(false); 13028 } 13029 13030 /** 13031 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 13032 * is null when caching is disabled. If caching is enabled and the cache is not ready, 13033 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 13034 * draw from the cache when the cache is enabled. To benefit from the cache, you must 13035 * request the drawing cache by calling this method and draw it on screen if the 13036 * returned bitmap is not null.</p> 13037 * 13038 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13039 * this method will create a bitmap of the same size as this view. Because this bitmap 13040 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13041 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13042 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13043 * size than the view. This implies that your application must be able to handle this 13044 * size.</p> 13045 * 13046 * @param autoScale Indicates whether the generated bitmap should be scaled based on 13047 * the current density of the screen when the application is in compatibility 13048 * mode. 13049 * 13050 * @return A bitmap representing this view or null if cache is disabled. 13051 * 13052 * @see #setDrawingCacheEnabled(boolean) 13053 * @see #isDrawingCacheEnabled() 13054 * @see #buildDrawingCache(boolean) 13055 * @see #destroyDrawingCache() 13056 */ 13057 public Bitmap getDrawingCache(boolean autoScale) { 13058 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 13059 return null; 13060 } 13061 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 13062 buildDrawingCache(autoScale); 13063 } 13064 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 13065 } 13066 13067 /** 13068 * <p>Frees the resources used by the drawing cache. If you call 13069 * {@link #buildDrawingCache()} manually without calling 13070 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13071 * should cleanup the cache with this method afterwards.</p> 13072 * 13073 * @see #setDrawingCacheEnabled(boolean) 13074 * @see #buildDrawingCache() 13075 * @see #getDrawingCache() 13076 */ 13077 public void destroyDrawingCache() { 13078 if (mDrawingCache != null) { 13079 mDrawingCache.recycle(); 13080 mDrawingCache = null; 13081 } 13082 if (mUnscaledDrawingCache != null) { 13083 mUnscaledDrawingCache.recycle(); 13084 mUnscaledDrawingCache = null; 13085 } 13086 } 13087 13088 /** 13089 * Setting a solid background color for the drawing cache's bitmaps will improve 13090 * performance and memory usage. Note, though that this should only be used if this 13091 * view will always be drawn on top of a solid color. 13092 * 13093 * @param color The background color to use for the drawing cache's bitmap 13094 * 13095 * @see #setDrawingCacheEnabled(boolean) 13096 * @see #buildDrawingCache() 13097 * @see #getDrawingCache() 13098 */ 13099 public void setDrawingCacheBackgroundColor(int color) { 13100 if (color != mDrawingCacheBackgroundColor) { 13101 mDrawingCacheBackgroundColor = color; 13102 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 13103 } 13104 } 13105 13106 /** 13107 * @see #setDrawingCacheBackgroundColor(int) 13108 * 13109 * @return The background color to used for the drawing cache's bitmap 13110 */ 13111 public int getDrawingCacheBackgroundColor() { 13112 return mDrawingCacheBackgroundColor; 13113 } 13114 13115 /** 13116 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 13117 * 13118 * @see #buildDrawingCache(boolean) 13119 */ 13120 public void buildDrawingCache() { 13121 buildDrawingCache(false); 13122 } 13123 13124 /** 13125 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 13126 * 13127 * <p>If you call {@link #buildDrawingCache()} manually without calling 13128 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13129 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 13130 * 13131 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13132 * this method will create a bitmap of the same size as this view. Because this bitmap 13133 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13134 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13135 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13136 * size than the view. This implies that your application must be able to handle this 13137 * size.</p> 13138 * 13139 * <p>You should avoid calling this method when hardware acceleration is enabled. If 13140 * you do not need the drawing cache bitmap, calling this method will increase memory 13141 * usage and cause the view to be rendered in software once, thus negatively impacting 13142 * performance.</p> 13143 * 13144 * @see #getDrawingCache() 13145 * @see #destroyDrawingCache() 13146 */ 13147 public void buildDrawingCache(boolean autoScale) { 13148 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 13149 mDrawingCache == null : mUnscaledDrawingCache == null)) { 13150 mCachingFailed = false; 13151 13152 int width = mRight - mLeft; 13153 int height = mBottom - mTop; 13154 13155 final AttachInfo attachInfo = mAttachInfo; 13156 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 13157 13158 if (autoScale && scalingRequired) { 13159 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 13160 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 13161 } 13162 13163 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 13164 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 13165 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 13166 13167 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 13168 final long drawingCacheSize = 13169 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 13170 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 13171 if (width > 0 && height > 0) { 13172 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 13173 + projectedBitmapSize + " bytes, only " 13174 + drawingCacheSize + " available"); 13175 } 13176 destroyDrawingCache(); 13177 mCachingFailed = true; 13178 return; 13179 } 13180 13181 boolean clear = true; 13182 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 13183 13184 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 13185 Bitmap.Config quality; 13186 if (!opaque) { 13187 // Never pick ARGB_4444 because it looks awful 13188 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 13189 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 13190 case DRAWING_CACHE_QUALITY_AUTO: 13191 quality = Bitmap.Config.ARGB_8888; 13192 break; 13193 case DRAWING_CACHE_QUALITY_LOW: 13194 quality = Bitmap.Config.ARGB_8888; 13195 break; 13196 case DRAWING_CACHE_QUALITY_HIGH: 13197 quality = Bitmap.Config.ARGB_8888; 13198 break; 13199 default: 13200 quality = Bitmap.Config.ARGB_8888; 13201 break; 13202 } 13203 } else { 13204 // Optimization for translucent windows 13205 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 13206 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 13207 } 13208 13209 // Try to cleanup memory 13210 if (bitmap != null) bitmap.recycle(); 13211 13212 try { 13213 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13214 width, height, quality); 13215 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 13216 if (autoScale) { 13217 mDrawingCache = bitmap; 13218 } else { 13219 mUnscaledDrawingCache = bitmap; 13220 } 13221 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 13222 } catch (OutOfMemoryError e) { 13223 // If there is not enough memory to create the bitmap cache, just 13224 // ignore the issue as bitmap caches are not required to draw the 13225 // view hierarchy 13226 if (autoScale) { 13227 mDrawingCache = null; 13228 } else { 13229 mUnscaledDrawingCache = null; 13230 } 13231 mCachingFailed = true; 13232 return; 13233 } 13234 13235 clear = drawingCacheBackgroundColor != 0; 13236 } 13237 13238 Canvas canvas; 13239 if (attachInfo != null) { 13240 canvas = attachInfo.mCanvas; 13241 if (canvas == null) { 13242 canvas = new Canvas(); 13243 } 13244 canvas.setBitmap(bitmap); 13245 // Temporarily clobber the cached Canvas in case one of our children 13246 // is also using a drawing cache. Without this, the children would 13247 // steal the canvas by attaching their own bitmap to it and bad, bad 13248 // thing would happen (invisible views, corrupted drawings, etc.) 13249 attachInfo.mCanvas = null; 13250 } else { 13251 // This case should hopefully never or seldom happen 13252 canvas = new Canvas(bitmap); 13253 } 13254 13255 if (clear) { 13256 bitmap.eraseColor(drawingCacheBackgroundColor); 13257 } 13258 13259 computeScroll(); 13260 final int restoreCount = canvas.save(); 13261 13262 if (autoScale && scalingRequired) { 13263 final float scale = attachInfo.mApplicationScale; 13264 canvas.scale(scale, scale); 13265 } 13266 13267 canvas.translate(-mScrollX, -mScrollY); 13268 13269 mPrivateFlags |= PFLAG_DRAWN; 13270 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 13271 mLayerType != LAYER_TYPE_NONE) { 13272 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 13273 } 13274 13275 // Fast path for layouts with no backgrounds 13276 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13277 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13278 dispatchDraw(canvas); 13279 if (mOverlay != null && !mOverlay.isEmpty()) { 13280 mOverlay.getOverlayView().draw(canvas); 13281 } 13282 } else { 13283 draw(canvas); 13284 } 13285 13286 canvas.restoreToCount(restoreCount); 13287 canvas.setBitmap(null); 13288 13289 if (attachInfo != null) { 13290 // Restore the cached Canvas for our siblings 13291 attachInfo.mCanvas = canvas; 13292 } 13293 } 13294 } 13295 13296 /** 13297 * Create a snapshot of the view into a bitmap. We should probably make 13298 * some form of this public, but should think about the API. 13299 */ 13300 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 13301 int width = mRight - mLeft; 13302 int height = mBottom - mTop; 13303 13304 final AttachInfo attachInfo = mAttachInfo; 13305 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 13306 width = (int) ((width * scale) + 0.5f); 13307 height = (int) ((height * scale) + 0.5f); 13308 13309 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13310 width > 0 ? width : 1, height > 0 ? height : 1, quality); 13311 if (bitmap == null) { 13312 throw new OutOfMemoryError(); 13313 } 13314 13315 Resources resources = getResources(); 13316 if (resources != null) { 13317 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 13318 } 13319 13320 Canvas canvas; 13321 if (attachInfo != null) { 13322 canvas = attachInfo.mCanvas; 13323 if (canvas == null) { 13324 canvas = new Canvas(); 13325 } 13326 canvas.setBitmap(bitmap); 13327 // Temporarily clobber the cached Canvas in case one of our children 13328 // is also using a drawing cache. Without this, the children would 13329 // steal the canvas by attaching their own bitmap to it and bad, bad 13330 // things would happen (invisible views, corrupted drawings, etc.) 13331 attachInfo.mCanvas = null; 13332 } else { 13333 // This case should hopefully never or seldom happen 13334 canvas = new Canvas(bitmap); 13335 } 13336 13337 if ((backgroundColor & 0xff000000) != 0) { 13338 bitmap.eraseColor(backgroundColor); 13339 } 13340 13341 computeScroll(); 13342 final int restoreCount = canvas.save(); 13343 canvas.scale(scale, scale); 13344 canvas.translate(-mScrollX, -mScrollY); 13345 13346 // Temporarily remove the dirty mask 13347 int flags = mPrivateFlags; 13348 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13349 13350 // Fast path for layouts with no backgrounds 13351 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13352 dispatchDraw(canvas); 13353 } else { 13354 draw(canvas); 13355 } 13356 13357 mPrivateFlags = flags; 13358 13359 canvas.restoreToCount(restoreCount); 13360 canvas.setBitmap(null); 13361 13362 if (attachInfo != null) { 13363 // Restore the cached Canvas for our siblings 13364 attachInfo.mCanvas = canvas; 13365 } 13366 13367 return bitmap; 13368 } 13369 13370 /** 13371 * Indicates whether this View is currently in edit mode. A View is usually 13372 * in edit mode when displayed within a developer tool. For instance, if 13373 * this View is being drawn by a visual user interface builder, this method 13374 * should return true. 13375 * 13376 * Subclasses should check the return value of this method to provide 13377 * different behaviors if their normal behavior might interfere with the 13378 * host environment. For instance: the class spawns a thread in its 13379 * constructor, the drawing code relies on device-specific features, etc. 13380 * 13381 * This method is usually checked in the drawing code of custom widgets. 13382 * 13383 * @return True if this View is in edit mode, false otherwise. 13384 */ 13385 public boolean isInEditMode() { 13386 return false; 13387 } 13388 13389 /** 13390 * If the View draws content inside its padding and enables fading edges, 13391 * it needs to support padding offsets. Padding offsets are added to the 13392 * fading edges to extend the length of the fade so that it covers pixels 13393 * drawn inside the padding. 13394 * 13395 * Subclasses of this class should override this method if they need 13396 * to draw content inside the padding. 13397 * 13398 * @return True if padding offset must be applied, false otherwise. 13399 * 13400 * @see #getLeftPaddingOffset() 13401 * @see #getRightPaddingOffset() 13402 * @see #getTopPaddingOffset() 13403 * @see #getBottomPaddingOffset() 13404 * 13405 * @since CURRENT 13406 */ 13407 protected boolean isPaddingOffsetRequired() { 13408 return false; 13409 } 13410 13411 /** 13412 * Amount by which to extend the left fading region. Called only when 13413 * {@link #isPaddingOffsetRequired()} returns true. 13414 * 13415 * @return The left padding offset in pixels. 13416 * 13417 * @see #isPaddingOffsetRequired() 13418 * 13419 * @since CURRENT 13420 */ 13421 protected int getLeftPaddingOffset() { 13422 return 0; 13423 } 13424 13425 /** 13426 * Amount by which to extend the right fading region. Called only when 13427 * {@link #isPaddingOffsetRequired()} returns true. 13428 * 13429 * @return The right padding offset in pixels. 13430 * 13431 * @see #isPaddingOffsetRequired() 13432 * 13433 * @since CURRENT 13434 */ 13435 protected int getRightPaddingOffset() { 13436 return 0; 13437 } 13438 13439 /** 13440 * Amount by which to extend the top fading region. Called only when 13441 * {@link #isPaddingOffsetRequired()} returns true. 13442 * 13443 * @return The top padding offset in pixels. 13444 * 13445 * @see #isPaddingOffsetRequired() 13446 * 13447 * @since CURRENT 13448 */ 13449 protected int getTopPaddingOffset() { 13450 return 0; 13451 } 13452 13453 /** 13454 * Amount by which to extend the bottom fading region. Called only when 13455 * {@link #isPaddingOffsetRequired()} returns true. 13456 * 13457 * @return The bottom padding offset in pixels. 13458 * 13459 * @see #isPaddingOffsetRequired() 13460 * 13461 * @since CURRENT 13462 */ 13463 protected int getBottomPaddingOffset() { 13464 return 0; 13465 } 13466 13467 /** 13468 * @hide 13469 * @param offsetRequired 13470 */ 13471 protected int getFadeTop(boolean offsetRequired) { 13472 int top = mPaddingTop; 13473 if (offsetRequired) top += getTopPaddingOffset(); 13474 return top; 13475 } 13476 13477 /** 13478 * @hide 13479 * @param offsetRequired 13480 */ 13481 protected int getFadeHeight(boolean offsetRequired) { 13482 int padding = mPaddingTop; 13483 if (offsetRequired) padding += getTopPaddingOffset(); 13484 return mBottom - mTop - mPaddingBottom - padding; 13485 } 13486 13487 /** 13488 * <p>Indicates whether this view is attached to a hardware accelerated 13489 * window or not.</p> 13490 * 13491 * <p>Even if this method returns true, it does not mean that every call 13492 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13493 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13494 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13495 * window is hardware accelerated, 13496 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13497 * return false, and this method will return true.</p> 13498 * 13499 * @return True if the view is attached to a window and the window is 13500 * hardware accelerated; false in any other case. 13501 */ 13502 public boolean isHardwareAccelerated() { 13503 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13504 } 13505 13506 /** 13507 * Sets a rectangular area on this view to which the view will be clipped 13508 * when it is drawn. Setting the value to null will remove the clip bounds 13509 * and the view will draw normally, using its full bounds. 13510 * 13511 * @param clipBounds The rectangular area, in the local coordinates of 13512 * this view, to which future drawing operations will be clipped. 13513 */ 13514 public void setClipBounds(Rect clipBounds) { 13515 if (clipBounds != null) { 13516 if (clipBounds.equals(mClipBounds)) { 13517 return; 13518 } 13519 if (mClipBounds == null) { 13520 invalidate(); 13521 mClipBounds = new Rect(clipBounds); 13522 } else { 13523 invalidate(Math.min(mClipBounds.left, clipBounds.left), 13524 Math.min(mClipBounds.top, clipBounds.top), 13525 Math.max(mClipBounds.right, clipBounds.right), 13526 Math.max(mClipBounds.bottom, clipBounds.bottom)); 13527 mClipBounds.set(clipBounds); 13528 } 13529 } else { 13530 if (mClipBounds != null) { 13531 invalidate(); 13532 mClipBounds = null; 13533 } 13534 } 13535 } 13536 13537 /** 13538 * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. 13539 * 13540 * @return A copy of the current clip bounds if clip bounds are set, 13541 * otherwise null. 13542 */ 13543 public Rect getClipBounds() { 13544 return (mClipBounds != null) ? new Rect(mClipBounds) : null; 13545 } 13546 13547 /** 13548 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13549 * case of an active Animation being run on the view. 13550 */ 13551 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13552 Animation a, boolean scalingRequired) { 13553 Transformation invalidationTransform; 13554 final int flags = parent.mGroupFlags; 13555 final boolean initialized = a.isInitialized(); 13556 if (!initialized) { 13557 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13558 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13559 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13560 onAnimationStart(); 13561 } 13562 13563 final Transformation t = parent.getChildTransformation(); 13564 boolean more = a.getTransformation(drawingTime, t, 1f); 13565 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13566 if (parent.mInvalidationTransformation == null) { 13567 parent.mInvalidationTransformation = new Transformation(); 13568 } 13569 invalidationTransform = parent.mInvalidationTransformation; 13570 a.getTransformation(drawingTime, invalidationTransform, 1f); 13571 } else { 13572 invalidationTransform = t; 13573 } 13574 13575 if (more) { 13576 if (!a.willChangeBounds()) { 13577 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13578 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13579 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13580 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13581 // The child need to draw an animation, potentially offscreen, so 13582 // make sure we do not cancel invalidate requests 13583 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13584 parent.invalidate(mLeft, mTop, mRight, mBottom); 13585 } 13586 } else { 13587 if (parent.mInvalidateRegion == null) { 13588 parent.mInvalidateRegion = new RectF(); 13589 } 13590 final RectF region = parent.mInvalidateRegion; 13591 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13592 invalidationTransform); 13593 13594 // The child need to draw an animation, potentially offscreen, so 13595 // make sure we do not cancel invalidate requests 13596 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13597 13598 final int left = mLeft + (int) region.left; 13599 final int top = mTop + (int) region.top; 13600 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13601 top + (int) (region.height() + .5f)); 13602 } 13603 } 13604 return more; 13605 } 13606 13607 /** 13608 * This method is called by getDisplayList() when a display list is created or re-rendered. 13609 * It sets or resets the current value of all properties on that display list (resetting is 13610 * necessary when a display list is being re-created, because we need to make sure that 13611 * previously-set transform values 13612 */ 13613 void setDisplayListProperties(DisplayList displayList) { 13614 if (displayList != null) { 13615 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13616 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13617 if (mParent instanceof ViewGroup) { 13618 displayList.setClipToBounds( 13619 (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 13620 } 13621 float alpha = 1; 13622 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 13623 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13624 ViewGroup parentVG = (ViewGroup) mParent; 13625 final Transformation t = parentVG.getChildTransformation(); 13626 if (parentVG.getChildStaticTransformation(this, t)) { 13627 final int transformType = t.getTransformationType(); 13628 if (transformType != Transformation.TYPE_IDENTITY) { 13629 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 13630 alpha = t.getAlpha(); 13631 } 13632 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 13633 displayList.setMatrix(t.getMatrix()); 13634 } 13635 } 13636 } 13637 } 13638 if (mTransformationInfo != null) { 13639 alpha *= mTransformationInfo.mAlpha; 13640 if (alpha < 1) { 13641 final int multipliedAlpha = (int) (255 * alpha); 13642 if (onSetAlpha(multipliedAlpha)) { 13643 alpha = 1; 13644 } 13645 } 13646 displayList.setTransformationInfo(alpha, 13647 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 13648 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 13649 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 13650 mTransformationInfo.mScaleY); 13651 if (mTransformationInfo.mCamera == null) { 13652 mTransformationInfo.mCamera = new Camera(); 13653 mTransformationInfo.matrix3D = new Matrix(); 13654 } 13655 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 13656 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 13657 displayList.setPivotX(getPivotX()); 13658 displayList.setPivotY(getPivotY()); 13659 } 13660 } else if (alpha < 1) { 13661 displayList.setAlpha(alpha); 13662 } 13663 } 13664 } 13665 13666 /** 13667 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 13668 * This draw() method is an implementation detail and is not intended to be overridden or 13669 * to be called from anywhere else other than ViewGroup.drawChild(). 13670 */ 13671 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 13672 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13673 boolean more = false; 13674 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 13675 final int flags = parent.mGroupFlags; 13676 13677 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 13678 parent.getChildTransformation().clear(); 13679 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13680 } 13681 13682 Transformation transformToApply = null; 13683 boolean concatMatrix = false; 13684 13685 boolean scalingRequired = false; 13686 boolean caching; 13687 int layerType = getLayerType(); 13688 13689 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 13690 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 13691 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 13692 caching = true; 13693 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 13694 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 13695 } else { 13696 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 13697 } 13698 13699 final Animation a = getAnimation(); 13700 if (a != null) { 13701 more = drawAnimation(parent, drawingTime, a, scalingRequired); 13702 concatMatrix = a.willChangeTransformationMatrix(); 13703 if (concatMatrix) { 13704 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13705 } 13706 transformToApply = parent.getChildTransformation(); 13707 } else { 13708 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == 13709 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { 13710 // No longer animating: clear out old animation matrix 13711 mDisplayList.setAnimationMatrix(null); 13712 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13713 } 13714 if (!useDisplayListProperties && 13715 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13716 final Transformation t = parent.getChildTransformation(); 13717 final boolean hasTransform = parent.getChildStaticTransformation(this, t); 13718 if (hasTransform) { 13719 final int transformType = t.getTransformationType(); 13720 transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null; 13721 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 13722 } 13723 } 13724 } 13725 13726 concatMatrix |= !childHasIdentityMatrix; 13727 13728 // Sets the flag as early as possible to allow draw() implementations 13729 // to call invalidate() successfully when doing animations 13730 mPrivateFlags |= PFLAG_DRAWN; 13731 13732 if (!concatMatrix && 13733 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 13734 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 13735 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 13736 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 13737 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 13738 return more; 13739 } 13740 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 13741 13742 if (hardwareAccelerated) { 13743 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 13744 // retain the flag's value temporarily in the mRecreateDisplayList flag 13745 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 13746 mPrivateFlags &= ~PFLAG_INVALIDATED; 13747 } 13748 13749 DisplayList displayList = null; 13750 Bitmap cache = null; 13751 boolean hasDisplayList = false; 13752 if (caching) { 13753 if (!hardwareAccelerated) { 13754 if (layerType != LAYER_TYPE_NONE) { 13755 layerType = LAYER_TYPE_SOFTWARE; 13756 buildDrawingCache(true); 13757 } 13758 cache = getDrawingCache(true); 13759 } else { 13760 switch (layerType) { 13761 case LAYER_TYPE_SOFTWARE: 13762 if (useDisplayListProperties) { 13763 hasDisplayList = canHaveDisplayList(); 13764 } else { 13765 buildDrawingCache(true); 13766 cache = getDrawingCache(true); 13767 } 13768 break; 13769 case LAYER_TYPE_HARDWARE: 13770 if (useDisplayListProperties) { 13771 hasDisplayList = canHaveDisplayList(); 13772 } 13773 break; 13774 case LAYER_TYPE_NONE: 13775 // Delay getting the display list until animation-driven alpha values are 13776 // set up and possibly passed on to the view 13777 hasDisplayList = canHaveDisplayList(); 13778 break; 13779 } 13780 } 13781 } 13782 useDisplayListProperties &= hasDisplayList; 13783 if (useDisplayListProperties) { 13784 displayList = getDisplayList(); 13785 if (!displayList.isValid()) { 13786 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13787 // to getDisplayList(), the display list will be marked invalid and we should not 13788 // try to use it again. 13789 displayList = null; 13790 hasDisplayList = false; 13791 useDisplayListProperties = false; 13792 } 13793 } 13794 13795 int sx = 0; 13796 int sy = 0; 13797 if (!hasDisplayList) { 13798 computeScroll(); 13799 sx = mScrollX; 13800 sy = mScrollY; 13801 } 13802 13803 final boolean hasNoCache = cache == null || hasDisplayList; 13804 final boolean offsetForScroll = cache == null && !hasDisplayList && 13805 layerType != LAYER_TYPE_HARDWARE; 13806 13807 int restoreTo = -1; 13808 if (!useDisplayListProperties || transformToApply != null) { 13809 restoreTo = canvas.save(); 13810 } 13811 if (offsetForScroll) { 13812 canvas.translate(mLeft - sx, mTop - sy); 13813 } else { 13814 if (!useDisplayListProperties) { 13815 canvas.translate(mLeft, mTop); 13816 } 13817 if (scalingRequired) { 13818 if (useDisplayListProperties) { 13819 // TODO: Might not need this if we put everything inside the DL 13820 restoreTo = canvas.save(); 13821 } 13822 // mAttachInfo cannot be null, otherwise scalingRequired == false 13823 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13824 canvas.scale(scale, scale); 13825 } 13826 } 13827 13828 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13829 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13830 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13831 if (transformToApply != null || !childHasIdentityMatrix) { 13832 int transX = 0; 13833 int transY = 0; 13834 13835 if (offsetForScroll) { 13836 transX = -sx; 13837 transY = -sy; 13838 } 13839 13840 if (transformToApply != null) { 13841 if (concatMatrix) { 13842 if (useDisplayListProperties) { 13843 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13844 } else { 13845 // Undo the scroll translation, apply the transformation matrix, 13846 // then redo the scroll translate to get the correct result. 13847 canvas.translate(-transX, -transY); 13848 canvas.concat(transformToApply.getMatrix()); 13849 canvas.translate(transX, transY); 13850 } 13851 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13852 } 13853 13854 float transformAlpha = transformToApply.getAlpha(); 13855 if (transformAlpha < 1) { 13856 alpha *= transformAlpha; 13857 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13858 } 13859 } 13860 13861 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13862 canvas.translate(-transX, -transY); 13863 canvas.concat(getMatrix()); 13864 canvas.translate(transX, transY); 13865 } 13866 } 13867 13868 // Deal with alpha if it is or used to be <1 13869 if (alpha < 1 || 13870 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13871 if (alpha < 1) { 13872 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13873 } else { 13874 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13875 } 13876 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13877 if (hasNoCache) { 13878 final int multipliedAlpha = (int) (255 * alpha); 13879 if (!onSetAlpha(multipliedAlpha)) { 13880 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13881 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13882 layerType != LAYER_TYPE_NONE) { 13883 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13884 } 13885 if (useDisplayListProperties) { 13886 displayList.setAlpha(alpha * getAlpha()); 13887 } else if (layerType == LAYER_TYPE_NONE) { 13888 final int scrollX = hasDisplayList ? 0 : sx; 13889 final int scrollY = hasDisplayList ? 0 : sy; 13890 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13891 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13892 } 13893 } else { 13894 // Alpha is handled by the child directly, clobber the layer's alpha 13895 mPrivateFlags |= PFLAG_ALPHA_SET; 13896 } 13897 } 13898 } 13899 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13900 onSetAlpha(255); 13901 mPrivateFlags &= ~PFLAG_ALPHA_SET; 13902 } 13903 13904 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13905 !useDisplayListProperties && cache == null) { 13906 if (offsetForScroll) { 13907 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13908 } else { 13909 if (!scalingRequired || cache == null) { 13910 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13911 } else { 13912 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13913 } 13914 } 13915 } 13916 13917 if (!useDisplayListProperties && hasDisplayList) { 13918 displayList = getDisplayList(); 13919 if (!displayList.isValid()) { 13920 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13921 // to getDisplayList(), the display list will be marked invalid and we should not 13922 // try to use it again. 13923 displayList = null; 13924 hasDisplayList = false; 13925 } 13926 } 13927 13928 if (hasNoCache) { 13929 boolean layerRendered = false; 13930 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13931 final HardwareLayer layer = getHardwareLayer(); 13932 if (layer != null && layer.isValid()) { 13933 mLayerPaint.setAlpha((int) (alpha * 255)); 13934 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13935 layerRendered = true; 13936 } else { 13937 final int scrollX = hasDisplayList ? 0 : sx; 13938 final int scrollY = hasDisplayList ? 0 : sy; 13939 canvas.saveLayer(scrollX, scrollY, 13940 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13941 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13942 } 13943 } 13944 13945 if (!layerRendered) { 13946 if (!hasDisplayList) { 13947 // Fast path for layouts with no backgrounds 13948 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13949 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13950 dispatchDraw(canvas); 13951 } else { 13952 draw(canvas); 13953 } 13954 } else { 13955 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13956 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13957 } 13958 } 13959 } else if (cache != null) { 13960 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13961 Paint cachePaint; 13962 13963 if (layerType == LAYER_TYPE_NONE) { 13964 cachePaint = parent.mCachePaint; 13965 if (cachePaint == null) { 13966 cachePaint = new Paint(); 13967 cachePaint.setDither(false); 13968 parent.mCachePaint = cachePaint; 13969 } 13970 if (alpha < 1) { 13971 cachePaint.setAlpha((int) (alpha * 255)); 13972 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13973 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13974 cachePaint.setAlpha(255); 13975 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13976 } 13977 } else { 13978 cachePaint = mLayerPaint; 13979 cachePaint.setAlpha((int) (alpha * 255)); 13980 } 13981 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13982 } 13983 13984 if (restoreTo >= 0) { 13985 canvas.restoreToCount(restoreTo); 13986 } 13987 13988 if (a != null && !more) { 13989 if (!hardwareAccelerated && !a.getFillAfter()) { 13990 onSetAlpha(255); 13991 } 13992 parent.finishAnimatingView(this, a); 13993 } 13994 13995 if (more && hardwareAccelerated) { 13996 // invalidation is the trigger to recreate display lists, so if we're using 13997 // display lists to render, force an invalidate to allow the animation to 13998 // continue drawing another frame 13999 parent.invalidate(true); 14000 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 14001 // alpha animations should cause the child to recreate its display list 14002 invalidate(true); 14003 } 14004 } 14005 14006 mRecreateDisplayList = false; 14007 14008 return more; 14009 } 14010 14011 /** 14012 * Manually render this view (and all of its children) to the given Canvas. 14013 * The view must have already done a full layout before this function is 14014 * called. When implementing a view, implement 14015 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 14016 * If you do need to override this method, call the superclass version. 14017 * 14018 * @param canvas The Canvas to which the View is rendered. 14019 */ 14020 public void draw(Canvas canvas) { 14021 if (mClipBounds != null) { 14022 canvas.clipRect(mClipBounds); 14023 } 14024 final int privateFlags = mPrivateFlags; 14025 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 14026 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 14027 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 14028 14029 /* 14030 * Draw traversal performs several drawing steps which must be executed 14031 * in the appropriate order: 14032 * 14033 * 1. Draw the background 14034 * 2. If necessary, save the canvas' layers to prepare for fading 14035 * 3. Draw view's content 14036 * 4. Draw children 14037 * 5. If necessary, draw the fading edges and restore layers 14038 * 6. Draw decorations (scrollbars for instance) 14039 */ 14040 14041 // Step 1, draw the background, if needed 14042 int saveCount; 14043 14044 if (!dirtyOpaque) { 14045 final Drawable background = mBackground; 14046 if (background != null) { 14047 final int scrollX = mScrollX; 14048 final int scrollY = mScrollY; 14049 14050 if (mBackgroundSizeChanged) { 14051 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 14052 mBackgroundSizeChanged = false; 14053 } 14054 14055 if ((scrollX | scrollY) == 0) { 14056 background.draw(canvas); 14057 } else { 14058 canvas.translate(scrollX, scrollY); 14059 background.draw(canvas); 14060 canvas.translate(-scrollX, -scrollY); 14061 } 14062 } 14063 } 14064 14065 // skip step 2 & 5 if possible (common case) 14066 final int viewFlags = mViewFlags; 14067 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 14068 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 14069 if (!verticalEdges && !horizontalEdges) { 14070 // Step 3, draw the content 14071 if (!dirtyOpaque) onDraw(canvas); 14072 14073 // Step 4, draw the children 14074 dispatchDraw(canvas); 14075 14076 // Step 6, draw decorations (scrollbars) 14077 onDrawScrollBars(canvas); 14078 14079 if (mOverlay != null && !mOverlay.isEmpty()) { 14080 mOverlay.getOverlayView().dispatchDraw(canvas); 14081 } 14082 14083 // we're done... 14084 return; 14085 } 14086 14087 /* 14088 * Here we do the full fledged routine... 14089 * (this is an uncommon case where speed matters less, 14090 * this is why we repeat some of the tests that have been 14091 * done above) 14092 */ 14093 14094 boolean drawTop = false; 14095 boolean drawBottom = false; 14096 boolean drawLeft = false; 14097 boolean drawRight = false; 14098 14099 float topFadeStrength = 0.0f; 14100 float bottomFadeStrength = 0.0f; 14101 float leftFadeStrength = 0.0f; 14102 float rightFadeStrength = 0.0f; 14103 14104 // Step 2, save the canvas' layers 14105 int paddingLeft = mPaddingLeft; 14106 14107 final boolean offsetRequired = isPaddingOffsetRequired(); 14108 if (offsetRequired) { 14109 paddingLeft += getLeftPaddingOffset(); 14110 } 14111 14112 int left = mScrollX + paddingLeft; 14113 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 14114 int top = mScrollY + getFadeTop(offsetRequired); 14115 int bottom = top + getFadeHeight(offsetRequired); 14116 14117 if (offsetRequired) { 14118 right += getRightPaddingOffset(); 14119 bottom += getBottomPaddingOffset(); 14120 } 14121 14122 final ScrollabilityCache scrollabilityCache = mScrollCache; 14123 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 14124 int length = (int) fadeHeight; 14125 14126 // clip the fade length if top and bottom fades overlap 14127 // overlapping fades produce odd-looking artifacts 14128 if (verticalEdges && (top + length > bottom - length)) { 14129 length = (bottom - top) / 2; 14130 } 14131 14132 // also clip horizontal fades if necessary 14133 if (horizontalEdges && (left + length > right - length)) { 14134 length = (right - left) / 2; 14135 } 14136 14137 if (verticalEdges) { 14138 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 14139 drawTop = topFadeStrength * fadeHeight > 1.0f; 14140 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 14141 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 14142 } 14143 14144 if (horizontalEdges) { 14145 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 14146 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 14147 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 14148 drawRight = rightFadeStrength * fadeHeight > 1.0f; 14149 } 14150 14151 saveCount = canvas.getSaveCount(); 14152 14153 int solidColor = getSolidColor(); 14154 if (solidColor == 0) { 14155 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14156 14157 if (drawTop) { 14158 canvas.saveLayer(left, top, right, top + length, null, flags); 14159 } 14160 14161 if (drawBottom) { 14162 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 14163 } 14164 14165 if (drawLeft) { 14166 canvas.saveLayer(left, top, left + length, bottom, null, flags); 14167 } 14168 14169 if (drawRight) { 14170 canvas.saveLayer(right - length, top, right, bottom, null, flags); 14171 } 14172 } else { 14173 scrollabilityCache.setFadeColor(solidColor); 14174 } 14175 14176 // Step 3, draw the content 14177 if (!dirtyOpaque) onDraw(canvas); 14178 14179 // Step 4, draw the children 14180 dispatchDraw(canvas); 14181 14182 // Step 5, draw the fade effect and restore layers 14183 final Paint p = scrollabilityCache.paint; 14184 final Matrix matrix = scrollabilityCache.matrix; 14185 final Shader fade = scrollabilityCache.shader; 14186 14187 if (drawTop) { 14188 matrix.setScale(1, fadeHeight * topFadeStrength); 14189 matrix.postTranslate(left, top); 14190 fade.setLocalMatrix(matrix); 14191 canvas.drawRect(left, top, right, top + length, p); 14192 } 14193 14194 if (drawBottom) { 14195 matrix.setScale(1, fadeHeight * bottomFadeStrength); 14196 matrix.postRotate(180); 14197 matrix.postTranslate(left, bottom); 14198 fade.setLocalMatrix(matrix); 14199 canvas.drawRect(left, bottom - length, right, bottom, p); 14200 } 14201 14202 if (drawLeft) { 14203 matrix.setScale(1, fadeHeight * leftFadeStrength); 14204 matrix.postRotate(-90); 14205 matrix.postTranslate(left, top); 14206 fade.setLocalMatrix(matrix); 14207 canvas.drawRect(left, top, left + length, bottom, p); 14208 } 14209 14210 if (drawRight) { 14211 matrix.setScale(1, fadeHeight * rightFadeStrength); 14212 matrix.postRotate(90); 14213 matrix.postTranslate(right, top); 14214 fade.setLocalMatrix(matrix); 14215 canvas.drawRect(right - length, top, right, bottom, p); 14216 } 14217 14218 canvas.restoreToCount(saveCount); 14219 14220 // Step 6, draw decorations (scrollbars) 14221 onDrawScrollBars(canvas); 14222 14223 if (mOverlay != null && !mOverlay.isEmpty()) { 14224 mOverlay.getOverlayView().dispatchDraw(canvas); 14225 } 14226 } 14227 14228 /** 14229 * Returns the overlay for this view, creating it if it does not yet exist. 14230 * Adding drawables to the overlay will cause them to be displayed whenever 14231 * the view itself is redrawn. Objects in the overlay should be actively 14232 * managed: remove them when they should not be displayed anymore. The 14233 * overlay will always have the same size as its host view. 14234 * 14235 * <p>Note: Overlays do not currently work correctly with {@link 14236 * SurfaceView} or {@link TextureView}; contents in overlays for these 14237 * types of views may not display correctly.</p> 14238 * 14239 * @return The ViewOverlay object for this view. 14240 * @see ViewOverlay 14241 */ 14242 public ViewOverlay getOverlay() { 14243 if (mOverlay == null) { 14244 mOverlay = new ViewOverlay(mContext, this); 14245 } 14246 return mOverlay; 14247 } 14248 14249 /** 14250 * Override this if your view is known to always be drawn on top of a solid color background, 14251 * and needs to draw fading edges. Returning a non-zero color enables the view system to 14252 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 14253 * should be set to 0xFF. 14254 * 14255 * @see #setVerticalFadingEdgeEnabled(boolean) 14256 * @see #setHorizontalFadingEdgeEnabled(boolean) 14257 * 14258 * @return The known solid color background for this view, or 0 if the color may vary 14259 */ 14260 @ViewDebug.ExportedProperty(category = "drawing") 14261 public int getSolidColor() { 14262 return 0; 14263 } 14264 14265 /** 14266 * Build a human readable string representation of the specified view flags. 14267 * 14268 * @param flags the view flags to convert to a string 14269 * @return a String representing the supplied flags 14270 */ 14271 private static String printFlags(int flags) { 14272 String output = ""; 14273 int numFlags = 0; 14274 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 14275 output += "TAKES_FOCUS"; 14276 numFlags++; 14277 } 14278 14279 switch (flags & VISIBILITY_MASK) { 14280 case INVISIBLE: 14281 if (numFlags > 0) { 14282 output += " "; 14283 } 14284 output += "INVISIBLE"; 14285 // USELESS HERE numFlags++; 14286 break; 14287 case GONE: 14288 if (numFlags > 0) { 14289 output += " "; 14290 } 14291 output += "GONE"; 14292 // USELESS HERE numFlags++; 14293 break; 14294 default: 14295 break; 14296 } 14297 return output; 14298 } 14299 14300 /** 14301 * Build a human readable string representation of the specified private 14302 * view flags. 14303 * 14304 * @param privateFlags the private view flags to convert to a string 14305 * @return a String representing the supplied flags 14306 */ 14307 private static String printPrivateFlags(int privateFlags) { 14308 String output = ""; 14309 int numFlags = 0; 14310 14311 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 14312 output += "WANTS_FOCUS"; 14313 numFlags++; 14314 } 14315 14316 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 14317 if (numFlags > 0) { 14318 output += " "; 14319 } 14320 output += "FOCUSED"; 14321 numFlags++; 14322 } 14323 14324 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 14325 if (numFlags > 0) { 14326 output += " "; 14327 } 14328 output += "SELECTED"; 14329 numFlags++; 14330 } 14331 14332 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 14333 if (numFlags > 0) { 14334 output += " "; 14335 } 14336 output += "IS_ROOT_NAMESPACE"; 14337 numFlags++; 14338 } 14339 14340 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 14341 if (numFlags > 0) { 14342 output += " "; 14343 } 14344 output += "HAS_BOUNDS"; 14345 numFlags++; 14346 } 14347 14348 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 14349 if (numFlags > 0) { 14350 output += " "; 14351 } 14352 output += "DRAWN"; 14353 // USELESS HERE numFlags++; 14354 } 14355 return output; 14356 } 14357 14358 /** 14359 * <p>Indicates whether or not this view's layout will be requested during 14360 * the next hierarchy layout pass.</p> 14361 * 14362 * @return true if the layout will be forced during next layout pass 14363 */ 14364 public boolean isLayoutRequested() { 14365 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 14366 } 14367 14368 /** 14369 * Return true if o is a ViewGroup that is laying out using optical bounds. 14370 * @hide 14371 */ 14372 public static boolean isLayoutModeOptical(Object o) { 14373 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 14374 } 14375 14376 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 14377 Insets parentInsets = mParent instanceof View ? 14378 ((View) mParent).getOpticalInsets() : Insets.NONE; 14379 Insets childInsets = getOpticalInsets(); 14380 return setFrame( 14381 left + parentInsets.left - childInsets.left, 14382 top + parentInsets.top - childInsets.top, 14383 right + parentInsets.left + childInsets.right, 14384 bottom + parentInsets.top + childInsets.bottom); 14385 } 14386 14387 /** 14388 * Assign a size and position to a view and all of its 14389 * descendants 14390 * 14391 * <p>This is the second phase of the layout mechanism. 14392 * (The first is measuring). In this phase, each parent calls 14393 * layout on all of its children to position them. 14394 * This is typically done using the child measurements 14395 * that were stored in the measure pass().</p> 14396 * 14397 * <p>Derived classes should not override this method. 14398 * Derived classes with children should override 14399 * onLayout. In that method, they should 14400 * call layout on each of their children.</p> 14401 * 14402 * @param l Left position, relative to parent 14403 * @param t Top position, relative to parent 14404 * @param r Right position, relative to parent 14405 * @param b Bottom position, relative to parent 14406 */ 14407 @SuppressWarnings({"unchecked"}) 14408 public void layout(int l, int t, int r, int b) { 14409 if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) { 14410 onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec); 14411 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 14412 } 14413 14414 int oldL = mLeft; 14415 int oldT = mTop; 14416 int oldB = mBottom; 14417 int oldR = mRight; 14418 14419 boolean changed = isLayoutModeOptical(mParent) ? 14420 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14421 14422 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14423 onLayout(changed, l, t, r, b); 14424 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14425 14426 ListenerInfo li = mListenerInfo; 14427 if (li != null && li.mOnLayoutChangeListeners != null) { 14428 ArrayList<OnLayoutChangeListener> listenersCopy = 14429 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14430 int numListeners = listenersCopy.size(); 14431 for (int i = 0; i < numListeners; ++i) { 14432 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14433 } 14434 } 14435 } 14436 14437 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14438 mPrivateFlags3 |= PFLAG3_IS_LAID_OUT; 14439 } 14440 14441 /** 14442 * Called from layout when this view should 14443 * assign a size and position to each of its children. 14444 * 14445 * Derived classes with children should override 14446 * this method and call layout on each of 14447 * their children. 14448 * @param changed This is a new size or position for this view 14449 * @param left Left position, relative to parent 14450 * @param top Top position, relative to parent 14451 * @param right Right position, relative to parent 14452 * @param bottom Bottom position, relative to parent 14453 */ 14454 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14455 } 14456 14457 /** 14458 * Assign a size and position to this view. 14459 * 14460 * This is called from layout. 14461 * 14462 * @param left Left position, relative to parent 14463 * @param top Top position, relative to parent 14464 * @param right Right position, relative to parent 14465 * @param bottom Bottom position, relative to parent 14466 * @return true if the new size and position are different than the 14467 * previous ones 14468 * {@hide} 14469 */ 14470 protected boolean setFrame(int left, int top, int right, int bottom) { 14471 boolean changed = false; 14472 14473 if (DBG) { 14474 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14475 + right + "," + bottom + ")"); 14476 } 14477 14478 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14479 changed = true; 14480 14481 // Remember our drawn bit 14482 int drawn = mPrivateFlags & PFLAG_DRAWN; 14483 14484 int oldWidth = mRight - mLeft; 14485 int oldHeight = mBottom - mTop; 14486 int newWidth = right - left; 14487 int newHeight = bottom - top; 14488 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14489 14490 // Invalidate our old position 14491 invalidate(sizeChanged); 14492 14493 mLeft = left; 14494 mTop = top; 14495 mRight = right; 14496 mBottom = bottom; 14497 if (mDisplayList != null) { 14498 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14499 } 14500 14501 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14502 14503 14504 if (sizeChanged) { 14505 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14506 // A change in dimension means an auto-centered pivot point changes, too 14507 if (mTransformationInfo != null) { 14508 mTransformationInfo.mMatrixDirty = true; 14509 } 14510 } 14511 sizeChange(newWidth, newHeight, oldWidth, oldHeight); 14512 } 14513 14514 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14515 // If we are visible, force the DRAWN bit to on so that 14516 // this invalidate will go through (at least to our parent). 14517 // This is because someone may have invalidated this view 14518 // before this call to setFrame came in, thereby clearing 14519 // the DRAWN bit. 14520 mPrivateFlags |= PFLAG_DRAWN; 14521 invalidate(sizeChanged); 14522 // parent display list may need to be recreated based on a change in the bounds 14523 // of any child 14524 invalidateParentCaches(); 14525 } 14526 14527 // Reset drawn bit to original value (invalidate turns it off) 14528 mPrivateFlags |= drawn; 14529 14530 mBackgroundSizeChanged = true; 14531 14532 notifySubtreeAccessibilityStateChangedIfNeeded(); 14533 } 14534 return changed; 14535 } 14536 14537 private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { 14538 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14539 if (mOverlay != null) { 14540 mOverlay.getOverlayView().setRight(newWidth); 14541 mOverlay.getOverlayView().setBottom(newHeight); 14542 } 14543 } 14544 14545 /** 14546 * Finalize inflating a view from XML. This is called as the last phase 14547 * of inflation, after all child views have been added. 14548 * 14549 * <p>Even if the subclass overrides onFinishInflate, they should always be 14550 * sure to call the super method, so that we get called. 14551 */ 14552 protected void onFinishInflate() { 14553 } 14554 14555 /** 14556 * Returns the resources associated with this view. 14557 * 14558 * @return Resources object. 14559 */ 14560 public Resources getResources() { 14561 return mResources; 14562 } 14563 14564 /** 14565 * Invalidates the specified Drawable. 14566 * 14567 * @param drawable the drawable to invalidate 14568 */ 14569 public void invalidateDrawable(Drawable drawable) { 14570 if (verifyDrawable(drawable)) { 14571 final Rect dirty = drawable.getBounds(); 14572 final int scrollX = mScrollX; 14573 final int scrollY = mScrollY; 14574 14575 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14576 dirty.right + scrollX, dirty.bottom + scrollY); 14577 } 14578 } 14579 14580 /** 14581 * Schedules an action on a drawable to occur at a specified time. 14582 * 14583 * @param who the recipient of the action 14584 * @param what the action to run on the drawable 14585 * @param when the time at which the action must occur. Uses the 14586 * {@link SystemClock#uptimeMillis} timebase. 14587 */ 14588 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14589 if (verifyDrawable(who) && what != null) { 14590 final long delay = when - SystemClock.uptimeMillis(); 14591 if (mAttachInfo != null) { 14592 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14593 Choreographer.CALLBACK_ANIMATION, what, who, 14594 Choreographer.subtractFrameDelay(delay)); 14595 } else { 14596 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14597 } 14598 } 14599 } 14600 14601 /** 14602 * Cancels a scheduled action on a drawable. 14603 * 14604 * @param who the recipient of the action 14605 * @param what the action to cancel 14606 */ 14607 public void unscheduleDrawable(Drawable who, Runnable what) { 14608 if (verifyDrawable(who) && what != null) { 14609 if (mAttachInfo != null) { 14610 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14611 Choreographer.CALLBACK_ANIMATION, what, who); 14612 } else { 14613 ViewRootImpl.getRunQueue().removeCallbacks(what); 14614 } 14615 } 14616 } 14617 14618 /** 14619 * Unschedule any events associated with the given Drawable. This can be 14620 * used when selecting a new Drawable into a view, so that the previous 14621 * one is completely unscheduled. 14622 * 14623 * @param who The Drawable to unschedule. 14624 * 14625 * @see #drawableStateChanged 14626 */ 14627 public void unscheduleDrawable(Drawable who) { 14628 if (mAttachInfo != null && who != null) { 14629 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14630 Choreographer.CALLBACK_ANIMATION, null, who); 14631 } 14632 } 14633 14634 /** 14635 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 14636 * that the View directionality can and will be resolved before its Drawables. 14637 * 14638 * Will call {@link View#onResolveDrawables} when resolution is done. 14639 * 14640 * @hide 14641 */ 14642 protected void resolveDrawables() { 14643 if (canResolveLayoutDirection()) { 14644 if (mBackground != null) { 14645 mBackground.setLayoutDirection(getLayoutDirection()); 14646 } 14647 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 14648 onResolveDrawables(getLayoutDirection()); 14649 } 14650 } 14651 14652 /** 14653 * Called when layout direction has been resolved. 14654 * 14655 * The default implementation does nothing. 14656 * 14657 * @param layoutDirection The resolved layout direction. 14658 * 14659 * @see #LAYOUT_DIRECTION_LTR 14660 * @see #LAYOUT_DIRECTION_RTL 14661 * 14662 * @hide 14663 */ 14664 public void onResolveDrawables(int layoutDirection) { 14665 } 14666 14667 /** 14668 * @hide 14669 */ 14670 protected void resetResolvedDrawables() { 14671 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 14672 } 14673 14674 private boolean isDrawablesResolved() { 14675 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 14676 } 14677 14678 /** 14679 * If your view subclass is displaying its own Drawable objects, it should 14680 * override this function and return true for any Drawable it is 14681 * displaying. This allows animations for those drawables to be 14682 * scheduled. 14683 * 14684 * <p>Be sure to call through to the super class when overriding this 14685 * function. 14686 * 14687 * @param who The Drawable to verify. Return true if it is one you are 14688 * displaying, else return the result of calling through to the 14689 * super class. 14690 * 14691 * @return boolean If true than the Drawable is being displayed in the 14692 * view; else false and it is not allowed to animate. 14693 * 14694 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 14695 * @see #drawableStateChanged() 14696 */ 14697 protected boolean verifyDrawable(Drawable who) { 14698 return who == mBackground; 14699 } 14700 14701 /** 14702 * This function is called whenever the state of the view changes in such 14703 * a way that it impacts the state of drawables being shown. 14704 * 14705 * <p>Be sure to call through to the superclass when overriding this 14706 * function. 14707 * 14708 * @see Drawable#setState(int[]) 14709 */ 14710 protected void drawableStateChanged() { 14711 Drawable d = mBackground; 14712 if (d != null && d.isStateful()) { 14713 d.setState(getDrawableState()); 14714 } 14715 } 14716 14717 /** 14718 * Call this to force a view to update its drawable state. This will cause 14719 * drawableStateChanged to be called on this view. Views that are interested 14720 * in the new state should call getDrawableState. 14721 * 14722 * @see #drawableStateChanged 14723 * @see #getDrawableState 14724 */ 14725 public void refreshDrawableState() { 14726 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 14727 drawableStateChanged(); 14728 14729 ViewParent parent = mParent; 14730 if (parent != null) { 14731 parent.childDrawableStateChanged(this); 14732 } 14733 } 14734 14735 /** 14736 * Return an array of resource IDs of the drawable states representing the 14737 * current state of the view. 14738 * 14739 * @return The current drawable state 14740 * 14741 * @see Drawable#setState(int[]) 14742 * @see #drawableStateChanged() 14743 * @see #onCreateDrawableState(int) 14744 */ 14745 public final int[] getDrawableState() { 14746 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 14747 return mDrawableState; 14748 } else { 14749 mDrawableState = onCreateDrawableState(0); 14750 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 14751 return mDrawableState; 14752 } 14753 } 14754 14755 /** 14756 * Generate the new {@link android.graphics.drawable.Drawable} state for 14757 * this view. This is called by the view 14758 * system when the cached Drawable state is determined to be invalid. To 14759 * retrieve the current state, you should use {@link #getDrawableState}. 14760 * 14761 * @param extraSpace if non-zero, this is the number of extra entries you 14762 * would like in the returned array in which you can place your own 14763 * states. 14764 * 14765 * @return Returns an array holding the current {@link Drawable} state of 14766 * the view. 14767 * 14768 * @see #mergeDrawableStates(int[], int[]) 14769 */ 14770 protected int[] onCreateDrawableState(int extraSpace) { 14771 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 14772 mParent instanceof View) { 14773 return ((View) mParent).onCreateDrawableState(extraSpace); 14774 } 14775 14776 int[] drawableState; 14777 14778 int privateFlags = mPrivateFlags; 14779 14780 int viewStateIndex = 0; 14781 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 14782 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 14783 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 14784 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 14785 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 14786 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 14787 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 14788 HardwareRenderer.isAvailable()) { 14789 // This is set if HW acceleration is requested, even if the current 14790 // process doesn't allow it. This is just to allow app preview 14791 // windows to better match their app. 14792 viewStateIndex |= VIEW_STATE_ACCELERATED; 14793 } 14794 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 14795 14796 final int privateFlags2 = mPrivateFlags2; 14797 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 14798 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 14799 14800 drawableState = VIEW_STATE_SETS[viewStateIndex]; 14801 14802 //noinspection ConstantIfStatement 14803 if (false) { 14804 Log.i("View", "drawableStateIndex=" + viewStateIndex); 14805 Log.i("View", toString() 14806 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 14807 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 14808 + " fo=" + hasFocus() 14809 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 14810 + " wf=" + hasWindowFocus() 14811 + ": " + Arrays.toString(drawableState)); 14812 } 14813 14814 if (extraSpace == 0) { 14815 return drawableState; 14816 } 14817 14818 final int[] fullState; 14819 if (drawableState != null) { 14820 fullState = new int[drawableState.length + extraSpace]; 14821 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 14822 } else { 14823 fullState = new int[extraSpace]; 14824 } 14825 14826 return fullState; 14827 } 14828 14829 /** 14830 * Merge your own state values in <var>additionalState</var> into the base 14831 * state values <var>baseState</var> that were returned by 14832 * {@link #onCreateDrawableState(int)}. 14833 * 14834 * @param baseState The base state values returned by 14835 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 14836 * own additional state values. 14837 * 14838 * @param additionalState The additional state values you would like 14839 * added to <var>baseState</var>; this array is not modified. 14840 * 14841 * @return As a convenience, the <var>baseState</var> array you originally 14842 * passed into the function is returned. 14843 * 14844 * @see #onCreateDrawableState(int) 14845 */ 14846 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 14847 final int N = baseState.length; 14848 int i = N - 1; 14849 while (i >= 0 && baseState[i] == 0) { 14850 i--; 14851 } 14852 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 14853 return baseState; 14854 } 14855 14856 /** 14857 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 14858 * on all Drawable objects associated with this view. 14859 */ 14860 public void jumpDrawablesToCurrentState() { 14861 if (mBackground != null) { 14862 mBackground.jumpToCurrentState(); 14863 } 14864 } 14865 14866 /** 14867 * Sets the background color for this view. 14868 * @param color the color of the background 14869 */ 14870 @RemotableViewMethod 14871 public void setBackgroundColor(int color) { 14872 if (mBackground instanceof ColorDrawable) { 14873 ((ColorDrawable) mBackground.mutate()).setColor(color); 14874 computeOpaqueFlags(); 14875 mBackgroundResource = 0; 14876 } else { 14877 setBackground(new ColorDrawable(color)); 14878 } 14879 } 14880 14881 /** 14882 * Set the background to a given resource. The resource should refer to 14883 * a Drawable object or 0 to remove the background. 14884 * @param resid The identifier of the resource. 14885 * 14886 * @attr ref android.R.styleable#View_background 14887 */ 14888 @RemotableViewMethod 14889 public void setBackgroundResource(int resid) { 14890 if (resid != 0 && resid == mBackgroundResource) { 14891 return; 14892 } 14893 14894 Drawable d= null; 14895 if (resid != 0) { 14896 d = mResources.getDrawable(resid); 14897 } 14898 setBackground(d); 14899 14900 mBackgroundResource = resid; 14901 } 14902 14903 /** 14904 * Set the background to a given Drawable, or remove the background. If the 14905 * background has padding, this View's padding is set to the background's 14906 * padding. However, when a background is removed, this View's padding isn't 14907 * touched. If setting the padding is desired, please use 14908 * {@link #setPadding(int, int, int, int)}. 14909 * 14910 * @param background The Drawable to use as the background, or null to remove the 14911 * background 14912 */ 14913 public void setBackground(Drawable background) { 14914 //noinspection deprecation 14915 setBackgroundDrawable(background); 14916 } 14917 14918 /** 14919 * @deprecated use {@link #setBackground(Drawable)} instead 14920 */ 14921 @Deprecated 14922 public void setBackgroundDrawable(Drawable background) { 14923 computeOpaqueFlags(); 14924 14925 if (background == mBackground) { 14926 return; 14927 } 14928 14929 boolean requestLayout = false; 14930 14931 mBackgroundResource = 0; 14932 14933 /* 14934 * Regardless of whether we're setting a new background or not, we want 14935 * to clear the previous drawable. 14936 */ 14937 if (mBackground != null) { 14938 mBackground.setCallback(null); 14939 unscheduleDrawable(mBackground); 14940 } 14941 14942 if (background != null) { 14943 Rect padding = sThreadLocal.get(); 14944 if (padding == null) { 14945 padding = new Rect(); 14946 sThreadLocal.set(padding); 14947 } 14948 resetResolvedDrawables(); 14949 background.setLayoutDirection(getLayoutDirection()); 14950 if (background.getPadding(padding)) { 14951 resetResolvedPadding(); 14952 switch (background.getLayoutDirection()) { 14953 case LAYOUT_DIRECTION_RTL: 14954 mUserPaddingLeftInitial = padding.right; 14955 mUserPaddingRightInitial = padding.left; 14956 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 14957 break; 14958 case LAYOUT_DIRECTION_LTR: 14959 default: 14960 mUserPaddingLeftInitial = padding.left; 14961 mUserPaddingRightInitial = padding.right; 14962 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 14963 } 14964 } 14965 14966 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14967 // if it has a different minimum size, we should layout again 14968 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14969 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14970 requestLayout = true; 14971 } 14972 14973 background.setCallback(this); 14974 if (background.isStateful()) { 14975 background.setState(getDrawableState()); 14976 } 14977 background.setVisible(getVisibility() == VISIBLE, false); 14978 mBackground = background; 14979 14980 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 14981 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 14982 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 14983 requestLayout = true; 14984 } 14985 } else { 14986 /* Remove the background */ 14987 mBackground = null; 14988 14989 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 14990 /* 14991 * This view ONLY drew the background before and we're removing 14992 * the background, so now it won't draw anything 14993 * (hence we SKIP_DRAW) 14994 */ 14995 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 14996 mPrivateFlags |= PFLAG_SKIP_DRAW; 14997 } 14998 14999 /* 15000 * When the background is set, we try to apply its padding to this 15001 * View. When the background is removed, we don't touch this View's 15002 * padding. This is noted in the Javadocs. Hence, we don't need to 15003 * requestLayout(), the invalidate() below is sufficient. 15004 */ 15005 15006 // The old background's minimum size could have affected this 15007 // View's layout, so let's requestLayout 15008 requestLayout = true; 15009 } 15010 15011 computeOpaqueFlags(); 15012 15013 if (requestLayout) { 15014 requestLayout(); 15015 } 15016 15017 mBackgroundSizeChanged = true; 15018 invalidate(true); 15019 } 15020 15021 /** 15022 * Gets the background drawable 15023 * 15024 * @return The drawable used as the background for this view, if any. 15025 * 15026 * @see #setBackground(Drawable) 15027 * 15028 * @attr ref android.R.styleable#View_background 15029 */ 15030 public Drawable getBackground() { 15031 return mBackground; 15032 } 15033 15034 /** 15035 * Sets the padding. The view may add on the space required to display 15036 * the scrollbars, depending on the style and visibility of the scrollbars. 15037 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 15038 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 15039 * from the values set in this call. 15040 * 15041 * @attr ref android.R.styleable#View_padding 15042 * @attr ref android.R.styleable#View_paddingBottom 15043 * @attr ref android.R.styleable#View_paddingLeft 15044 * @attr ref android.R.styleable#View_paddingRight 15045 * @attr ref android.R.styleable#View_paddingTop 15046 * @param left the left padding in pixels 15047 * @param top the top padding in pixels 15048 * @param right the right padding in pixels 15049 * @param bottom the bottom padding in pixels 15050 */ 15051 public void setPadding(int left, int top, int right, int bottom) { 15052 resetResolvedPadding(); 15053 15054 mUserPaddingStart = UNDEFINED_PADDING; 15055 mUserPaddingEnd = UNDEFINED_PADDING; 15056 15057 mUserPaddingLeftInitial = left; 15058 mUserPaddingRightInitial = right; 15059 15060 internalSetPadding(left, top, right, bottom); 15061 } 15062 15063 /** 15064 * @hide 15065 */ 15066 protected void internalSetPadding(int left, int top, int right, int bottom) { 15067 mUserPaddingLeft = left; 15068 mUserPaddingRight = right; 15069 mUserPaddingBottom = bottom; 15070 15071 final int viewFlags = mViewFlags; 15072 boolean changed = false; 15073 15074 // Common case is there are no scroll bars. 15075 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 15076 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 15077 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 15078 ? 0 : getVerticalScrollbarWidth(); 15079 switch (mVerticalScrollbarPosition) { 15080 case SCROLLBAR_POSITION_DEFAULT: 15081 if (isLayoutRtl()) { 15082 left += offset; 15083 } else { 15084 right += offset; 15085 } 15086 break; 15087 case SCROLLBAR_POSITION_RIGHT: 15088 right += offset; 15089 break; 15090 case SCROLLBAR_POSITION_LEFT: 15091 left += offset; 15092 break; 15093 } 15094 } 15095 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 15096 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 15097 ? 0 : getHorizontalScrollbarHeight(); 15098 } 15099 } 15100 15101 if (mPaddingLeft != left) { 15102 changed = true; 15103 mPaddingLeft = left; 15104 } 15105 if (mPaddingTop != top) { 15106 changed = true; 15107 mPaddingTop = top; 15108 } 15109 if (mPaddingRight != right) { 15110 changed = true; 15111 mPaddingRight = right; 15112 } 15113 if (mPaddingBottom != bottom) { 15114 changed = true; 15115 mPaddingBottom = bottom; 15116 } 15117 15118 if (changed) { 15119 requestLayout(); 15120 } 15121 } 15122 15123 /** 15124 * Sets the relative padding. The view may add on the space required to display 15125 * the scrollbars, depending on the style and visibility of the scrollbars. 15126 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 15127 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 15128 * from the values set in this call. 15129 * 15130 * @attr ref android.R.styleable#View_padding 15131 * @attr ref android.R.styleable#View_paddingBottom 15132 * @attr ref android.R.styleable#View_paddingStart 15133 * @attr ref android.R.styleable#View_paddingEnd 15134 * @attr ref android.R.styleable#View_paddingTop 15135 * @param start the start padding in pixels 15136 * @param top the top padding in pixels 15137 * @param end the end padding in pixels 15138 * @param bottom the bottom padding in pixels 15139 */ 15140 public void setPaddingRelative(int start, int top, int end, int bottom) { 15141 resetResolvedPadding(); 15142 15143 mUserPaddingStart = start; 15144 mUserPaddingEnd = end; 15145 15146 switch(getLayoutDirection()) { 15147 case LAYOUT_DIRECTION_RTL: 15148 mUserPaddingLeftInitial = end; 15149 mUserPaddingRightInitial = start; 15150 internalSetPadding(end, top, start, bottom); 15151 break; 15152 case LAYOUT_DIRECTION_LTR: 15153 default: 15154 mUserPaddingLeftInitial = start; 15155 mUserPaddingRightInitial = end; 15156 internalSetPadding(start, top, end, bottom); 15157 } 15158 } 15159 15160 /** 15161 * Returns the top padding of this view. 15162 * 15163 * @return the top padding in pixels 15164 */ 15165 public int getPaddingTop() { 15166 return mPaddingTop; 15167 } 15168 15169 /** 15170 * Returns the bottom padding of this view. If there are inset and enabled 15171 * scrollbars, this value may include the space required to display the 15172 * scrollbars as well. 15173 * 15174 * @return the bottom padding in pixels 15175 */ 15176 public int getPaddingBottom() { 15177 return mPaddingBottom; 15178 } 15179 15180 /** 15181 * Returns the left padding of this view. If there are inset and enabled 15182 * scrollbars, this value may include the space required to display the 15183 * scrollbars as well. 15184 * 15185 * @return the left padding in pixels 15186 */ 15187 public int getPaddingLeft() { 15188 if (!isPaddingResolved()) { 15189 resolvePadding(); 15190 } 15191 return mPaddingLeft; 15192 } 15193 15194 /** 15195 * Returns the start padding of this view depending on its resolved layout direction. 15196 * If there are inset and enabled scrollbars, this value may include the space 15197 * required to display the scrollbars as well. 15198 * 15199 * @return the start padding in pixels 15200 */ 15201 public int getPaddingStart() { 15202 if (!isPaddingResolved()) { 15203 resolvePadding(); 15204 } 15205 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15206 mPaddingRight : mPaddingLeft; 15207 } 15208 15209 /** 15210 * Returns the right padding of this view. If there are inset and enabled 15211 * scrollbars, this value may include the space required to display the 15212 * scrollbars as well. 15213 * 15214 * @return the right padding in pixels 15215 */ 15216 public int getPaddingRight() { 15217 if (!isPaddingResolved()) { 15218 resolvePadding(); 15219 } 15220 return mPaddingRight; 15221 } 15222 15223 /** 15224 * Returns the end padding of this view depending on its resolved layout direction. 15225 * If there are inset and enabled scrollbars, this value may include the space 15226 * required to display the scrollbars as well. 15227 * 15228 * @return the end padding in pixels 15229 */ 15230 public int getPaddingEnd() { 15231 if (!isPaddingResolved()) { 15232 resolvePadding(); 15233 } 15234 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15235 mPaddingLeft : mPaddingRight; 15236 } 15237 15238 /** 15239 * Return if the padding as been set thru relative values 15240 * {@link #setPaddingRelative(int, int, int, int)} or thru 15241 * @attr ref android.R.styleable#View_paddingStart or 15242 * @attr ref android.R.styleable#View_paddingEnd 15243 * 15244 * @return true if the padding is relative or false if it is not. 15245 */ 15246 public boolean isPaddingRelative() { 15247 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 15248 } 15249 15250 Insets computeOpticalInsets() { 15251 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 15252 } 15253 15254 /** 15255 * @hide 15256 */ 15257 public void resetPaddingToInitialValues() { 15258 if (isRtlCompatibilityMode()) { 15259 mPaddingLeft = mUserPaddingLeftInitial; 15260 mPaddingRight = mUserPaddingRightInitial; 15261 return; 15262 } 15263 if (isLayoutRtl()) { 15264 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 15265 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 15266 } else { 15267 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 15268 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 15269 } 15270 } 15271 15272 /** 15273 * @hide 15274 */ 15275 public Insets getOpticalInsets() { 15276 if (mLayoutInsets == null) { 15277 mLayoutInsets = computeOpticalInsets(); 15278 } 15279 return mLayoutInsets; 15280 } 15281 15282 /** 15283 * Changes the selection state of this view. A view can be selected or not. 15284 * Note that selection is not the same as focus. Views are typically 15285 * selected in the context of an AdapterView like ListView or GridView; 15286 * the selected view is the view that is highlighted. 15287 * 15288 * @param selected true if the view must be selected, false otherwise 15289 */ 15290 public void setSelected(boolean selected) { 15291 //noinspection DoubleNegation 15292 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 15293 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 15294 if (!selected) resetPressedState(); 15295 invalidate(true); 15296 refreshDrawableState(); 15297 dispatchSetSelected(selected); 15298 notifyViewAccessibilityStateChangedIfNeeded(); 15299 } 15300 } 15301 15302 /** 15303 * Dispatch setSelected to all of this View's children. 15304 * 15305 * @see #setSelected(boolean) 15306 * 15307 * @param selected The new selected state 15308 */ 15309 protected void dispatchSetSelected(boolean selected) { 15310 } 15311 15312 /** 15313 * Indicates the selection state of this view. 15314 * 15315 * @return true if the view is selected, false otherwise 15316 */ 15317 @ViewDebug.ExportedProperty 15318 public boolean isSelected() { 15319 return (mPrivateFlags & PFLAG_SELECTED) != 0; 15320 } 15321 15322 /** 15323 * Changes the activated state of this view. A view can be activated or not. 15324 * Note that activation is not the same as selection. Selection is 15325 * a transient property, representing the view (hierarchy) the user is 15326 * currently interacting with. Activation is a longer-term state that the 15327 * user can move views in and out of. For example, in a list view with 15328 * single or multiple selection enabled, the views in the current selection 15329 * set are activated. (Um, yeah, we are deeply sorry about the terminology 15330 * here.) The activated state is propagated down to children of the view it 15331 * is set on. 15332 * 15333 * @param activated true if the view must be activated, false otherwise 15334 */ 15335 public void setActivated(boolean activated) { 15336 //noinspection DoubleNegation 15337 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 15338 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 15339 invalidate(true); 15340 refreshDrawableState(); 15341 dispatchSetActivated(activated); 15342 } 15343 } 15344 15345 /** 15346 * Dispatch setActivated to all of this View's children. 15347 * 15348 * @see #setActivated(boolean) 15349 * 15350 * @param activated The new activated state 15351 */ 15352 protected void dispatchSetActivated(boolean activated) { 15353 } 15354 15355 /** 15356 * Indicates the activation state of this view. 15357 * 15358 * @return true if the view is activated, false otherwise 15359 */ 15360 @ViewDebug.ExportedProperty 15361 public boolean isActivated() { 15362 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 15363 } 15364 15365 /** 15366 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 15367 * observer can be used to get notifications when global events, like 15368 * layout, happen. 15369 * 15370 * The returned ViewTreeObserver observer is not guaranteed to remain 15371 * valid for the lifetime of this View. If the caller of this method keeps 15372 * a long-lived reference to ViewTreeObserver, it should always check for 15373 * the return value of {@link ViewTreeObserver#isAlive()}. 15374 * 15375 * @return The ViewTreeObserver for this view's hierarchy. 15376 */ 15377 public ViewTreeObserver getViewTreeObserver() { 15378 if (mAttachInfo != null) { 15379 return mAttachInfo.mTreeObserver; 15380 } 15381 if (mFloatingTreeObserver == null) { 15382 mFloatingTreeObserver = new ViewTreeObserver(); 15383 } 15384 return mFloatingTreeObserver; 15385 } 15386 15387 /** 15388 * <p>Finds the topmost view in the current view hierarchy.</p> 15389 * 15390 * @return the topmost view containing this view 15391 */ 15392 public View getRootView() { 15393 if (mAttachInfo != null) { 15394 final View v = mAttachInfo.mRootView; 15395 if (v != null) { 15396 return v; 15397 } 15398 } 15399 15400 View parent = this; 15401 15402 while (parent.mParent != null && parent.mParent instanceof View) { 15403 parent = (View) parent.mParent; 15404 } 15405 15406 return parent; 15407 } 15408 15409 /** 15410 * <p>Computes the coordinates of this view on the screen. The argument 15411 * must be an array of two integers. After the method returns, the array 15412 * contains the x and y location in that order.</p> 15413 * 15414 * @param location an array of two integers in which to hold the coordinates 15415 */ 15416 public void getLocationOnScreen(int[] location) { 15417 getLocationInWindow(location); 15418 15419 final AttachInfo info = mAttachInfo; 15420 if (info != null) { 15421 location[0] += info.mWindowLeft; 15422 location[1] += info.mWindowTop; 15423 } 15424 } 15425 15426 /** 15427 * <p>Computes the coordinates of this view in its window. The argument 15428 * must be an array of two integers. After the method returns, the array 15429 * contains the x and y location in that order.</p> 15430 * 15431 * @param location an array of two integers in which to hold the coordinates 15432 */ 15433 public void getLocationInWindow(int[] location) { 15434 if (location == null || location.length < 2) { 15435 throw new IllegalArgumentException("location must be an array of two integers"); 15436 } 15437 15438 if (mAttachInfo == null) { 15439 // When the view is not attached to a window, this method does not make sense 15440 location[0] = location[1] = 0; 15441 return; 15442 } 15443 15444 float[] position = mAttachInfo.mTmpTransformLocation; 15445 position[0] = position[1] = 0.0f; 15446 15447 if (!hasIdentityMatrix()) { 15448 getMatrix().mapPoints(position); 15449 } 15450 15451 position[0] += mLeft; 15452 position[1] += mTop; 15453 15454 ViewParent viewParent = mParent; 15455 while (viewParent instanceof View) { 15456 final View view = (View) viewParent; 15457 15458 position[0] -= view.mScrollX; 15459 position[1] -= view.mScrollY; 15460 15461 if (!view.hasIdentityMatrix()) { 15462 view.getMatrix().mapPoints(position); 15463 } 15464 15465 position[0] += view.mLeft; 15466 position[1] += view.mTop; 15467 15468 viewParent = view.mParent; 15469 } 15470 15471 if (viewParent instanceof ViewRootImpl) { 15472 // *cough* 15473 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15474 position[1] -= vr.mCurScrollY; 15475 } 15476 15477 location[0] = (int) (position[0] + 0.5f); 15478 location[1] = (int) (position[1] + 0.5f); 15479 } 15480 15481 /** 15482 * {@hide} 15483 * @param id the id of the view to be found 15484 * @return the view of the specified id, null if cannot be found 15485 */ 15486 protected View findViewTraversal(int id) { 15487 if (id == mID) { 15488 return this; 15489 } 15490 return null; 15491 } 15492 15493 /** 15494 * {@hide} 15495 * @param tag the tag of the view to be found 15496 * @return the view of specified tag, null if cannot be found 15497 */ 15498 protected View findViewWithTagTraversal(Object tag) { 15499 if (tag != null && tag.equals(mTag)) { 15500 return this; 15501 } 15502 return null; 15503 } 15504 15505 /** 15506 * {@hide} 15507 * @param predicate The predicate to evaluate. 15508 * @param childToSkip If not null, ignores this child during the recursive traversal. 15509 * @return The first view that matches the predicate or null. 15510 */ 15511 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15512 if (predicate.apply(this)) { 15513 return this; 15514 } 15515 return null; 15516 } 15517 15518 /** 15519 * Look for a child view with the given id. If this view has the given 15520 * id, return this view. 15521 * 15522 * @param id The id to search for. 15523 * @return The view that has the given id in the hierarchy or null 15524 */ 15525 public final View findViewById(int id) { 15526 if (id < 0) { 15527 return null; 15528 } 15529 return findViewTraversal(id); 15530 } 15531 15532 /** 15533 * Finds a view by its unuque and stable accessibility id. 15534 * 15535 * @param accessibilityId The searched accessibility id. 15536 * @return The found view. 15537 */ 15538 final View findViewByAccessibilityId(int accessibilityId) { 15539 if (accessibilityId < 0) { 15540 return null; 15541 } 15542 return findViewByAccessibilityIdTraversal(accessibilityId); 15543 } 15544 15545 /** 15546 * Performs the traversal to find a view by its unuque and stable accessibility id. 15547 * 15548 * <strong>Note:</strong>This method does not stop at the root namespace 15549 * boundary since the user can touch the screen at an arbitrary location 15550 * potentially crossing the root namespace bounday which will send an 15551 * accessibility event to accessibility services and they should be able 15552 * to obtain the event source. Also accessibility ids are guaranteed to be 15553 * unique in the window. 15554 * 15555 * @param accessibilityId The accessibility id. 15556 * @return The found view. 15557 * 15558 * @hide 15559 */ 15560 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 15561 if (getAccessibilityViewId() == accessibilityId) { 15562 return this; 15563 } 15564 return null; 15565 } 15566 15567 /** 15568 * Look for a child view with the given tag. If this view has the given 15569 * tag, return this view. 15570 * 15571 * @param tag The tag to search for, using "tag.equals(getTag())". 15572 * @return The View that has the given tag in the hierarchy or null 15573 */ 15574 public final View findViewWithTag(Object tag) { 15575 if (tag == null) { 15576 return null; 15577 } 15578 return findViewWithTagTraversal(tag); 15579 } 15580 15581 /** 15582 * {@hide} 15583 * Look for a child view that matches the specified predicate. 15584 * If this view matches the predicate, return this view. 15585 * 15586 * @param predicate The predicate to evaluate. 15587 * @return The first view that matches the predicate or null. 15588 */ 15589 public final View findViewByPredicate(Predicate<View> predicate) { 15590 return findViewByPredicateTraversal(predicate, null); 15591 } 15592 15593 /** 15594 * {@hide} 15595 * Look for a child view that matches the specified predicate, 15596 * starting with the specified view and its descendents and then 15597 * recusively searching the ancestors and siblings of that view 15598 * until this view is reached. 15599 * 15600 * This method is useful in cases where the predicate does not match 15601 * a single unique view (perhaps multiple views use the same id) 15602 * and we are trying to find the view that is "closest" in scope to the 15603 * starting view. 15604 * 15605 * @param start The view to start from. 15606 * @param predicate The predicate to evaluate. 15607 * @return The first view that matches the predicate or null. 15608 */ 15609 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 15610 View childToSkip = null; 15611 for (;;) { 15612 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 15613 if (view != null || start == this) { 15614 return view; 15615 } 15616 15617 ViewParent parent = start.getParent(); 15618 if (parent == null || !(parent instanceof View)) { 15619 return null; 15620 } 15621 15622 childToSkip = start; 15623 start = (View) parent; 15624 } 15625 } 15626 15627 /** 15628 * Sets the identifier for this view. The identifier does not have to be 15629 * unique in this view's hierarchy. The identifier should be a positive 15630 * number. 15631 * 15632 * @see #NO_ID 15633 * @see #getId() 15634 * @see #findViewById(int) 15635 * 15636 * @param id a number used to identify the view 15637 * 15638 * @attr ref android.R.styleable#View_id 15639 */ 15640 public void setId(int id) { 15641 mID = id; 15642 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 15643 mID = generateViewId(); 15644 } 15645 } 15646 15647 /** 15648 * {@hide} 15649 * 15650 * @param isRoot true if the view belongs to the root namespace, false 15651 * otherwise 15652 */ 15653 public void setIsRootNamespace(boolean isRoot) { 15654 if (isRoot) { 15655 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 15656 } else { 15657 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 15658 } 15659 } 15660 15661 /** 15662 * {@hide} 15663 * 15664 * @return true if the view belongs to the root namespace, false otherwise 15665 */ 15666 public boolean isRootNamespace() { 15667 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 15668 } 15669 15670 /** 15671 * Returns this view's identifier. 15672 * 15673 * @return a positive integer used to identify the view or {@link #NO_ID} 15674 * if the view has no ID 15675 * 15676 * @see #setId(int) 15677 * @see #findViewById(int) 15678 * @attr ref android.R.styleable#View_id 15679 */ 15680 @ViewDebug.CapturedViewProperty 15681 public int getId() { 15682 return mID; 15683 } 15684 15685 /** 15686 * Returns this view's tag. 15687 * 15688 * @return the Object stored in this view as a tag 15689 * 15690 * @see #setTag(Object) 15691 * @see #getTag(int) 15692 */ 15693 @ViewDebug.ExportedProperty 15694 public Object getTag() { 15695 return mTag; 15696 } 15697 15698 /** 15699 * Sets the tag associated with this view. A tag can be used to mark 15700 * a view in its hierarchy and does not have to be unique within the 15701 * hierarchy. Tags can also be used to store data within a view without 15702 * resorting to another data structure. 15703 * 15704 * @param tag an Object to tag the view with 15705 * 15706 * @see #getTag() 15707 * @see #setTag(int, Object) 15708 */ 15709 public void setTag(final Object tag) { 15710 mTag = tag; 15711 } 15712 15713 /** 15714 * Returns the tag associated with this view and the specified key. 15715 * 15716 * @param key The key identifying the tag 15717 * 15718 * @return the Object stored in this view as a tag 15719 * 15720 * @see #setTag(int, Object) 15721 * @see #getTag() 15722 */ 15723 public Object getTag(int key) { 15724 if (mKeyedTags != null) return mKeyedTags.get(key); 15725 return null; 15726 } 15727 15728 /** 15729 * Sets a tag associated with this view and a key. A tag can be used 15730 * to mark a view in its hierarchy and does not have to be unique within 15731 * the hierarchy. Tags can also be used to store data within a view 15732 * without resorting to another data structure. 15733 * 15734 * The specified key should be an id declared in the resources of the 15735 * application to ensure it is unique (see the <a 15736 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 15737 * Keys identified as belonging to 15738 * the Android framework or not associated with any package will cause 15739 * an {@link IllegalArgumentException} to be thrown. 15740 * 15741 * @param key The key identifying the tag 15742 * @param tag An Object to tag the view with 15743 * 15744 * @throws IllegalArgumentException If they specified key is not valid 15745 * 15746 * @see #setTag(Object) 15747 * @see #getTag(int) 15748 */ 15749 public void setTag(int key, final Object tag) { 15750 // If the package id is 0x00 or 0x01, it's either an undefined package 15751 // or a framework id 15752 if ((key >>> 24) < 2) { 15753 throw new IllegalArgumentException("The key must be an application-specific " 15754 + "resource id."); 15755 } 15756 15757 setKeyedTag(key, tag); 15758 } 15759 15760 /** 15761 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 15762 * framework id. 15763 * 15764 * @hide 15765 */ 15766 public void setTagInternal(int key, Object tag) { 15767 if ((key >>> 24) != 0x1) { 15768 throw new IllegalArgumentException("The key must be a framework-specific " 15769 + "resource id."); 15770 } 15771 15772 setKeyedTag(key, tag); 15773 } 15774 15775 private void setKeyedTag(int key, Object tag) { 15776 if (mKeyedTags == null) { 15777 mKeyedTags = new SparseArray<Object>(2); 15778 } 15779 15780 mKeyedTags.put(key, tag); 15781 } 15782 15783 /** 15784 * Prints information about this view in the log output, with the tag 15785 * {@link #VIEW_LOG_TAG}. 15786 * 15787 * @hide 15788 */ 15789 public void debug() { 15790 debug(0); 15791 } 15792 15793 /** 15794 * Prints information about this view in the log output, with the tag 15795 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 15796 * indentation defined by the <code>depth</code>. 15797 * 15798 * @param depth the indentation level 15799 * 15800 * @hide 15801 */ 15802 protected void debug(int depth) { 15803 String output = debugIndent(depth - 1); 15804 15805 output += "+ " + this; 15806 int id = getId(); 15807 if (id != -1) { 15808 output += " (id=" + id + ")"; 15809 } 15810 Object tag = getTag(); 15811 if (tag != null) { 15812 output += " (tag=" + tag + ")"; 15813 } 15814 Log.d(VIEW_LOG_TAG, output); 15815 15816 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 15817 output = debugIndent(depth) + " FOCUSED"; 15818 Log.d(VIEW_LOG_TAG, output); 15819 } 15820 15821 output = debugIndent(depth); 15822 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 15823 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 15824 + "} "; 15825 Log.d(VIEW_LOG_TAG, output); 15826 15827 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 15828 || mPaddingBottom != 0) { 15829 output = debugIndent(depth); 15830 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 15831 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 15832 Log.d(VIEW_LOG_TAG, output); 15833 } 15834 15835 output = debugIndent(depth); 15836 output += "mMeasureWidth=" + mMeasuredWidth + 15837 " mMeasureHeight=" + mMeasuredHeight; 15838 Log.d(VIEW_LOG_TAG, output); 15839 15840 output = debugIndent(depth); 15841 if (mLayoutParams == null) { 15842 output += "BAD! no layout params"; 15843 } else { 15844 output = mLayoutParams.debug(output); 15845 } 15846 Log.d(VIEW_LOG_TAG, output); 15847 15848 output = debugIndent(depth); 15849 output += "flags={"; 15850 output += View.printFlags(mViewFlags); 15851 output += "}"; 15852 Log.d(VIEW_LOG_TAG, output); 15853 15854 output = debugIndent(depth); 15855 output += "privateFlags={"; 15856 output += View.printPrivateFlags(mPrivateFlags); 15857 output += "}"; 15858 Log.d(VIEW_LOG_TAG, output); 15859 } 15860 15861 /** 15862 * Creates a string of whitespaces used for indentation. 15863 * 15864 * @param depth the indentation level 15865 * @return a String containing (depth * 2 + 3) * 2 white spaces 15866 * 15867 * @hide 15868 */ 15869 protected static String debugIndent(int depth) { 15870 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 15871 for (int i = 0; i < (depth * 2) + 3; i++) { 15872 spaces.append(' ').append(' '); 15873 } 15874 return spaces.toString(); 15875 } 15876 15877 /** 15878 * <p>Return the offset of the widget's text baseline from the widget's top 15879 * boundary. If this widget does not support baseline alignment, this 15880 * method returns -1. </p> 15881 * 15882 * @return the offset of the baseline within the widget's bounds or -1 15883 * if baseline alignment is not supported 15884 */ 15885 @ViewDebug.ExportedProperty(category = "layout") 15886 public int getBaseline() { 15887 return -1; 15888 } 15889 15890 /** 15891 * Returns whether the view hierarchy is currently undergoing a layout pass. This 15892 * information is useful to avoid situations such as calling {@link #requestLayout()} during 15893 * a layout pass. 15894 * 15895 * @return whether the view hierarchy is currently undergoing a layout pass 15896 */ 15897 public boolean isInLayout() { 15898 ViewRootImpl viewRoot = getViewRootImpl(); 15899 return (viewRoot != null && viewRoot.isInLayout()); 15900 } 15901 15902 /** 15903 * Call this when something has changed which has invalidated the 15904 * layout of this view. This will schedule a layout pass of the view 15905 * tree. This should not be called while the view hierarchy is currently in a layout 15906 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 15907 * end of the current layout pass (and then layout will run again) or after the current 15908 * frame is drawn and the next layout occurs. 15909 * 15910 * <p>Subclasses which override this method should call the superclass method to 15911 * handle possible request-during-layout errors correctly.</p> 15912 */ 15913 public void requestLayout() { 15914 if (mMeasureCache != null) mMeasureCache.clear(); 15915 15916 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 15917 // Only trigger request-during-layout logic if this is the view requesting it, 15918 // not the views in its parent hierarchy 15919 ViewRootImpl viewRoot = getViewRootImpl(); 15920 if (viewRoot != null && viewRoot.isInLayout()) { 15921 if (!viewRoot.requestLayoutDuringLayout(this)) { 15922 return; 15923 } 15924 } 15925 mAttachInfo.mViewRequestingLayout = this; 15926 } 15927 15928 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15929 mPrivateFlags |= PFLAG_INVALIDATED; 15930 15931 if (mParent != null && !mParent.isLayoutRequested()) { 15932 mParent.requestLayout(); 15933 } 15934 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 15935 mAttachInfo.mViewRequestingLayout = null; 15936 } 15937 } 15938 15939 /** 15940 * Forces this view to be laid out during the next layout pass. 15941 * This method does not call requestLayout() or forceLayout() 15942 * on the parent. 15943 */ 15944 public void forceLayout() { 15945 if (mMeasureCache != null) mMeasureCache.clear(); 15946 15947 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15948 mPrivateFlags |= PFLAG_INVALIDATED; 15949 } 15950 15951 /** 15952 * <p> 15953 * This is called to find out how big a view should be. The parent 15954 * supplies constraint information in the width and height parameters. 15955 * </p> 15956 * 15957 * <p> 15958 * The actual measurement work of a view is performed in 15959 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 15960 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 15961 * </p> 15962 * 15963 * 15964 * @param widthMeasureSpec Horizontal space requirements as imposed by the 15965 * parent 15966 * @param heightMeasureSpec Vertical space requirements as imposed by the 15967 * parent 15968 * 15969 * @see #onMeasure(int, int) 15970 */ 15971 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 15972 boolean optical = isLayoutModeOptical(this); 15973 if (optical != isLayoutModeOptical(mParent)) { 15974 Insets insets = getOpticalInsets(); 15975 int oWidth = insets.left + insets.right; 15976 int oHeight = insets.top + insets.bottom; 15977 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 15978 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 15979 } 15980 15981 // Suppress sign extension for the low bytes 15982 long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL; 15983 if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2); 15984 15985 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 15986 widthMeasureSpec != mOldWidthMeasureSpec || 15987 heightMeasureSpec != mOldHeightMeasureSpec) { 15988 15989 // first clears the measured dimension flag 15990 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 15991 15992 resolveRtlPropertiesIfNeeded(); 15993 15994 int cacheIndex = mMeasureCache.indexOfKey(key); 15995 if (cacheIndex < 0) { 15996 // measure ourselves, this should set the measured dimension flag back 15997 onMeasure(widthMeasureSpec, heightMeasureSpec); 15998 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 15999 } else { 16000 long value = mMeasureCache.valueAt(cacheIndex); 16001 // Casting a long to int drops the high 32 bits, no mask needed 16002 setMeasuredDimension((int) (value >> 32), (int) value); 16003 mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16004 } 16005 16006 // flag not set, setMeasuredDimension() was not invoked, we raise 16007 // an exception to warn the developer 16008 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 16009 throw new IllegalStateException("onMeasure() did not set the" 16010 + " measured dimension by calling" 16011 + " setMeasuredDimension()"); 16012 } 16013 16014 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 16015 } 16016 16017 mOldWidthMeasureSpec = widthMeasureSpec; 16018 mOldHeightMeasureSpec = heightMeasureSpec; 16019 16020 mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 | 16021 (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension 16022 } 16023 16024 /** 16025 * <p> 16026 * Measure the view and its content to determine the measured width and the 16027 * measured height. This method is invoked by {@link #measure(int, int)} and 16028 * should be overriden by subclasses to provide accurate and efficient 16029 * measurement of their contents. 16030 * </p> 16031 * 16032 * <p> 16033 * <strong>CONTRACT:</strong> When overriding this method, you 16034 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 16035 * measured width and height of this view. Failure to do so will trigger an 16036 * <code>IllegalStateException</code>, thrown by 16037 * {@link #measure(int, int)}. Calling the superclass' 16038 * {@link #onMeasure(int, int)} is a valid use. 16039 * </p> 16040 * 16041 * <p> 16042 * The base class implementation of measure defaults to the background size, 16043 * unless a larger size is allowed by the MeasureSpec. Subclasses should 16044 * override {@link #onMeasure(int, int)} to provide better measurements of 16045 * their content. 16046 * </p> 16047 * 16048 * <p> 16049 * If this method is overridden, it is the subclass's responsibility to make 16050 * sure the measured height and width are at least the view's minimum height 16051 * and width ({@link #getSuggestedMinimumHeight()} and 16052 * {@link #getSuggestedMinimumWidth()}). 16053 * </p> 16054 * 16055 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 16056 * The requirements are encoded with 16057 * {@link android.view.View.MeasureSpec}. 16058 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 16059 * The requirements are encoded with 16060 * {@link android.view.View.MeasureSpec}. 16061 * 16062 * @see #getMeasuredWidth() 16063 * @see #getMeasuredHeight() 16064 * @see #setMeasuredDimension(int, int) 16065 * @see #getSuggestedMinimumHeight() 16066 * @see #getSuggestedMinimumWidth() 16067 * @see android.view.View.MeasureSpec#getMode(int) 16068 * @see android.view.View.MeasureSpec#getSize(int) 16069 */ 16070 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 16071 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 16072 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 16073 } 16074 16075 /** 16076 * <p>This method must be called by {@link #onMeasure(int, int)} to store the 16077 * measured width and measured height. Failing to do so will trigger an 16078 * exception at measurement time.</p> 16079 * 16080 * @param measuredWidth The measured width of this view. May be a complex 16081 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16082 * {@link #MEASURED_STATE_TOO_SMALL}. 16083 * @param measuredHeight The measured height of this view. May be a complex 16084 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16085 * {@link #MEASURED_STATE_TOO_SMALL}. 16086 */ 16087 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 16088 boolean optical = isLayoutModeOptical(this); 16089 if (optical != isLayoutModeOptical(mParent)) { 16090 Insets insets = getOpticalInsets(); 16091 int opticalWidth = insets.left + insets.right; 16092 int opticalHeight = insets.top + insets.bottom; 16093 16094 measuredWidth += optical ? opticalWidth : -opticalWidth; 16095 measuredHeight += optical ? opticalHeight : -opticalHeight; 16096 } 16097 mMeasuredWidth = measuredWidth; 16098 mMeasuredHeight = measuredHeight; 16099 16100 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 16101 } 16102 16103 /** 16104 * Merge two states as returned by {@link #getMeasuredState()}. 16105 * @param curState The current state as returned from a view or the result 16106 * of combining multiple views. 16107 * @param newState The new view state to combine. 16108 * @return Returns a new integer reflecting the combination of the two 16109 * states. 16110 */ 16111 public static int combineMeasuredStates(int curState, int newState) { 16112 return curState | newState; 16113 } 16114 16115 /** 16116 * Version of {@link #resolveSizeAndState(int, int, int)} 16117 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 16118 */ 16119 public static int resolveSize(int size, int measureSpec) { 16120 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 16121 } 16122 16123 /** 16124 * Utility to reconcile a desired size and state, with constraints imposed 16125 * by a MeasureSpec. Will take the desired size, unless a different size 16126 * is imposed by the constraints. The returned value is a compound integer, 16127 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 16128 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 16129 * size is smaller than the size the view wants to be. 16130 * 16131 * @param size How big the view wants to be 16132 * @param measureSpec Constraints imposed by the parent 16133 * @return Size information bit mask as defined by 16134 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 16135 */ 16136 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 16137 int result = size; 16138 int specMode = MeasureSpec.getMode(measureSpec); 16139 int specSize = MeasureSpec.getSize(measureSpec); 16140 switch (specMode) { 16141 case MeasureSpec.UNSPECIFIED: 16142 result = size; 16143 break; 16144 case MeasureSpec.AT_MOST: 16145 if (specSize < size) { 16146 result = specSize | MEASURED_STATE_TOO_SMALL; 16147 } else { 16148 result = size; 16149 } 16150 break; 16151 case MeasureSpec.EXACTLY: 16152 result = specSize; 16153 break; 16154 } 16155 return result | (childMeasuredState&MEASURED_STATE_MASK); 16156 } 16157 16158 /** 16159 * Utility to return a default size. Uses the supplied size if the 16160 * MeasureSpec imposed no constraints. Will get larger if allowed 16161 * by the MeasureSpec. 16162 * 16163 * @param size Default size for this view 16164 * @param measureSpec Constraints imposed by the parent 16165 * @return The size this view should be. 16166 */ 16167 public static int getDefaultSize(int size, int measureSpec) { 16168 int result = size; 16169 int specMode = MeasureSpec.getMode(measureSpec); 16170 int specSize = MeasureSpec.getSize(measureSpec); 16171 16172 switch (specMode) { 16173 case MeasureSpec.UNSPECIFIED: 16174 result = size; 16175 break; 16176 case MeasureSpec.AT_MOST: 16177 case MeasureSpec.EXACTLY: 16178 result = specSize; 16179 break; 16180 } 16181 return result; 16182 } 16183 16184 /** 16185 * Returns the suggested minimum height that the view should use. This 16186 * returns the maximum of the view's minimum height 16187 * and the background's minimum height 16188 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 16189 * <p> 16190 * When being used in {@link #onMeasure(int, int)}, the caller should still 16191 * ensure the returned height is within the requirements of the parent. 16192 * 16193 * @return The suggested minimum height of the view. 16194 */ 16195 protected int getSuggestedMinimumHeight() { 16196 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 16197 16198 } 16199 16200 /** 16201 * Returns the suggested minimum width that the view should use. This 16202 * returns the maximum of the view's minimum width) 16203 * and the background's minimum width 16204 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 16205 * <p> 16206 * When being used in {@link #onMeasure(int, int)}, the caller should still 16207 * ensure the returned width is within the requirements of the parent. 16208 * 16209 * @return The suggested minimum width of the view. 16210 */ 16211 protected int getSuggestedMinimumWidth() { 16212 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 16213 } 16214 16215 /** 16216 * Returns the minimum height of the view. 16217 * 16218 * @return the minimum height the view will try to be. 16219 * 16220 * @see #setMinimumHeight(int) 16221 * 16222 * @attr ref android.R.styleable#View_minHeight 16223 */ 16224 public int getMinimumHeight() { 16225 return mMinHeight; 16226 } 16227 16228 /** 16229 * Sets the minimum height of the view. It is not guaranteed the view will 16230 * be able to achieve this minimum height (for example, if its parent layout 16231 * constrains it with less available height). 16232 * 16233 * @param minHeight The minimum height the view will try to be. 16234 * 16235 * @see #getMinimumHeight() 16236 * 16237 * @attr ref android.R.styleable#View_minHeight 16238 */ 16239 public void setMinimumHeight(int minHeight) { 16240 mMinHeight = minHeight; 16241 requestLayout(); 16242 } 16243 16244 /** 16245 * Returns the minimum width of the view. 16246 * 16247 * @return the minimum width the view will try to be. 16248 * 16249 * @see #setMinimumWidth(int) 16250 * 16251 * @attr ref android.R.styleable#View_minWidth 16252 */ 16253 public int getMinimumWidth() { 16254 return mMinWidth; 16255 } 16256 16257 /** 16258 * Sets the minimum width of the view. It is not guaranteed the view will 16259 * be able to achieve this minimum width (for example, if its parent layout 16260 * constrains it with less available width). 16261 * 16262 * @param minWidth The minimum width the view will try to be. 16263 * 16264 * @see #getMinimumWidth() 16265 * 16266 * @attr ref android.R.styleable#View_minWidth 16267 */ 16268 public void setMinimumWidth(int minWidth) { 16269 mMinWidth = minWidth; 16270 requestLayout(); 16271 16272 } 16273 16274 /** 16275 * Get the animation currently associated with this view. 16276 * 16277 * @return The animation that is currently playing or 16278 * scheduled to play for this view. 16279 */ 16280 public Animation getAnimation() { 16281 return mCurrentAnimation; 16282 } 16283 16284 /** 16285 * Start the specified animation now. 16286 * 16287 * @param animation the animation to start now 16288 */ 16289 public void startAnimation(Animation animation) { 16290 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 16291 setAnimation(animation); 16292 invalidateParentCaches(); 16293 invalidate(true); 16294 } 16295 16296 /** 16297 * Cancels any animations for this view. 16298 */ 16299 public void clearAnimation() { 16300 if (mCurrentAnimation != null) { 16301 mCurrentAnimation.detach(); 16302 } 16303 mCurrentAnimation = null; 16304 invalidateParentIfNeeded(); 16305 } 16306 16307 /** 16308 * Sets the next animation to play for this view. 16309 * If you want the animation to play immediately, use 16310 * {@link #startAnimation(android.view.animation.Animation)} instead. 16311 * This method provides allows fine-grained 16312 * control over the start time and invalidation, but you 16313 * must make sure that 1) the animation has a start time set, and 16314 * 2) the view's parent (which controls animations on its children) 16315 * will be invalidated when the animation is supposed to 16316 * start. 16317 * 16318 * @param animation The next animation, or null. 16319 */ 16320 public void setAnimation(Animation animation) { 16321 mCurrentAnimation = animation; 16322 16323 if (animation != null) { 16324 // If the screen is off assume the animation start time is now instead of 16325 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 16326 // would cause the animation to start when the screen turns back on 16327 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 16328 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 16329 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 16330 } 16331 animation.reset(); 16332 } 16333 } 16334 16335 /** 16336 * Invoked by a parent ViewGroup to notify the start of the animation 16337 * currently associated with this view. If you override this method, 16338 * always call super.onAnimationStart(); 16339 * 16340 * @see #setAnimation(android.view.animation.Animation) 16341 * @see #getAnimation() 16342 */ 16343 protected void onAnimationStart() { 16344 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 16345 } 16346 16347 /** 16348 * Invoked by a parent ViewGroup to notify the end of the animation 16349 * currently associated with this view. If you override this method, 16350 * always call super.onAnimationEnd(); 16351 * 16352 * @see #setAnimation(android.view.animation.Animation) 16353 * @see #getAnimation() 16354 */ 16355 protected void onAnimationEnd() { 16356 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 16357 } 16358 16359 /** 16360 * Invoked if there is a Transform that involves alpha. Subclass that can 16361 * draw themselves with the specified alpha should return true, and then 16362 * respect that alpha when their onDraw() is called. If this returns false 16363 * then the view may be redirected to draw into an offscreen buffer to 16364 * fulfill the request, which will look fine, but may be slower than if the 16365 * subclass handles it internally. The default implementation returns false. 16366 * 16367 * @param alpha The alpha (0..255) to apply to the view's drawing 16368 * @return true if the view can draw with the specified alpha. 16369 */ 16370 protected boolean onSetAlpha(int alpha) { 16371 return false; 16372 } 16373 16374 /** 16375 * This is used by the RootView to perform an optimization when 16376 * the view hierarchy contains one or several SurfaceView. 16377 * SurfaceView is always considered transparent, but its children are not, 16378 * therefore all View objects remove themselves from the global transparent 16379 * region (passed as a parameter to this function). 16380 * 16381 * @param region The transparent region for this ViewAncestor (window). 16382 * 16383 * @return Returns true if the effective visibility of the view at this 16384 * point is opaque, regardless of the transparent region; returns false 16385 * if it is possible for underlying windows to be seen behind the view. 16386 * 16387 * {@hide} 16388 */ 16389 public boolean gatherTransparentRegion(Region region) { 16390 final AttachInfo attachInfo = mAttachInfo; 16391 if (region != null && attachInfo != null) { 16392 final int pflags = mPrivateFlags; 16393 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 16394 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 16395 // remove it from the transparent region. 16396 final int[] location = attachInfo.mTransparentLocation; 16397 getLocationInWindow(location); 16398 region.op(location[0], location[1], location[0] + mRight - mLeft, 16399 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 16400 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 16401 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 16402 // exists, so we remove the background drawable's non-transparent 16403 // parts from this transparent region. 16404 applyDrawableToTransparentRegion(mBackground, region); 16405 } 16406 } 16407 return true; 16408 } 16409 16410 /** 16411 * Play a sound effect for this view. 16412 * 16413 * <p>The framework will play sound effects for some built in actions, such as 16414 * clicking, but you may wish to play these effects in your widget, 16415 * for instance, for internal navigation. 16416 * 16417 * <p>The sound effect will only be played if sound effects are enabled by the user, and 16418 * {@link #isSoundEffectsEnabled()} is true. 16419 * 16420 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 16421 */ 16422 public void playSoundEffect(int soundConstant) { 16423 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 16424 return; 16425 } 16426 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 16427 } 16428 16429 /** 16430 * BZZZTT!!1! 16431 * 16432 * <p>Provide haptic feedback to the user for this view. 16433 * 16434 * <p>The framework will provide haptic feedback for some built in actions, 16435 * such as long presses, but you may wish to provide feedback for your 16436 * own widget. 16437 * 16438 * <p>The feedback will only be performed if 16439 * {@link #isHapticFeedbackEnabled()} is true. 16440 * 16441 * @param feedbackConstant One of the constants defined in 16442 * {@link HapticFeedbackConstants} 16443 */ 16444 public boolean performHapticFeedback(int feedbackConstant) { 16445 return performHapticFeedback(feedbackConstant, 0); 16446 } 16447 16448 /** 16449 * BZZZTT!!1! 16450 * 16451 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 16452 * 16453 * @param feedbackConstant One of the constants defined in 16454 * {@link HapticFeedbackConstants} 16455 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 16456 */ 16457 public boolean performHapticFeedback(int feedbackConstant, int flags) { 16458 if (mAttachInfo == null) { 16459 return false; 16460 } 16461 //noinspection SimplifiableIfStatement 16462 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 16463 && !isHapticFeedbackEnabled()) { 16464 return false; 16465 } 16466 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 16467 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 16468 } 16469 16470 /** 16471 * Request that the visibility of the status bar or other screen/window 16472 * decorations be changed. 16473 * 16474 * <p>This method is used to put the over device UI into temporary modes 16475 * where the user's attention is focused more on the application content, 16476 * by dimming or hiding surrounding system affordances. This is typically 16477 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16478 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16479 * to be placed behind the action bar (and with these flags other system 16480 * affordances) so that smooth transitions between hiding and showing them 16481 * can be done. 16482 * 16483 * <p>Two representative examples of the use of system UI visibility is 16484 * implementing a content browsing application (like a magazine reader) 16485 * and a video playing application. 16486 * 16487 * <p>The first code shows a typical implementation of a View in a content 16488 * browsing application. In this implementation, the application goes 16489 * into a content-oriented mode by hiding the status bar and action bar, 16490 * and putting the navigation elements into lights out mode. The user can 16491 * then interact with content while in this mode. Such an application should 16492 * provide an easy way for the user to toggle out of the mode (such as to 16493 * check information in the status bar or access notifications). In the 16494 * implementation here, this is done simply by tapping on the content. 16495 * 16496 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16497 * content} 16498 * 16499 * <p>This second code sample shows a typical implementation of a View 16500 * in a video playing application. In this situation, while the video is 16501 * playing the application would like to go into a complete full-screen mode, 16502 * to use as much of the display as possible for the video. When in this state 16503 * the user can not interact with the application; the system intercepts 16504 * touching on the screen to pop the UI out of full screen mode. See 16505 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16506 * 16507 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16508 * content} 16509 * 16510 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16511 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16512 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16513 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16514 */ 16515 public void setSystemUiVisibility(int visibility) { 16516 if (visibility != mSystemUiVisibility) { 16517 mSystemUiVisibility = visibility; 16518 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16519 mParent.recomputeViewAttributes(this); 16520 } 16521 } 16522 } 16523 16524 /** 16525 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 16526 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16527 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16528 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16529 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16530 */ 16531 public int getSystemUiVisibility() { 16532 return mSystemUiVisibility; 16533 } 16534 16535 /** 16536 * Returns the current system UI visibility that is currently set for 16537 * the entire window. This is the combination of the 16538 * {@link #setSystemUiVisibility(int)} values supplied by all of the 16539 * views in the window. 16540 */ 16541 public int getWindowSystemUiVisibility() { 16542 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 16543 } 16544 16545 /** 16546 * Override to find out when the window's requested system UI visibility 16547 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 16548 * This is different from the callbacks received through 16549 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 16550 * in that this is only telling you about the local request of the window, 16551 * not the actual values applied by the system. 16552 */ 16553 public void onWindowSystemUiVisibilityChanged(int visible) { 16554 } 16555 16556 /** 16557 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 16558 * the view hierarchy. 16559 */ 16560 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 16561 onWindowSystemUiVisibilityChanged(visible); 16562 } 16563 16564 /** 16565 * Set a listener to receive callbacks when the visibility of the system bar changes. 16566 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 16567 */ 16568 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 16569 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 16570 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16571 mParent.recomputeViewAttributes(this); 16572 } 16573 } 16574 16575 /** 16576 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 16577 * the view hierarchy. 16578 */ 16579 public void dispatchSystemUiVisibilityChanged(int visibility) { 16580 ListenerInfo li = mListenerInfo; 16581 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 16582 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 16583 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 16584 } 16585 } 16586 16587 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 16588 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 16589 if (val != mSystemUiVisibility) { 16590 setSystemUiVisibility(val); 16591 return true; 16592 } 16593 return false; 16594 } 16595 16596 /** @hide */ 16597 public void setDisabledSystemUiVisibility(int flags) { 16598 if (mAttachInfo != null) { 16599 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 16600 mAttachInfo.mDisabledSystemUiVisibility = flags; 16601 if (mParent != null) { 16602 mParent.recomputeViewAttributes(this); 16603 } 16604 } 16605 } 16606 } 16607 16608 /** 16609 * Creates an image that the system displays during the drag and drop 16610 * operation. This is called a "drag shadow". The default implementation 16611 * for a DragShadowBuilder based on a View returns an image that has exactly the same 16612 * appearance as the given View. The default also positions the center of the drag shadow 16613 * directly under the touch point. If no View is provided (the constructor with no parameters 16614 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 16615 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 16616 * default is an invisible drag shadow. 16617 * <p> 16618 * You are not required to use the View you provide to the constructor as the basis of the 16619 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 16620 * anything you want as the drag shadow. 16621 * </p> 16622 * <p> 16623 * You pass a DragShadowBuilder object to the system when you start the drag. The system 16624 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 16625 * size and position of the drag shadow. It uses this data to construct a 16626 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 16627 * so that your application can draw the shadow image in the Canvas. 16628 * </p> 16629 * 16630 * <div class="special reference"> 16631 * <h3>Developer Guides</h3> 16632 * <p>For a guide to implementing drag and drop features, read the 16633 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16634 * </div> 16635 */ 16636 public static class DragShadowBuilder { 16637 private final WeakReference<View> mView; 16638 16639 /** 16640 * Constructs a shadow image builder based on a View. By default, the resulting drag 16641 * shadow will have the same appearance and dimensions as the View, with the touch point 16642 * over the center of the View. 16643 * @param view A View. Any View in scope can be used. 16644 */ 16645 public DragShadowBuilder(View view) { 16646 mView = new WeakReference<View>(view); 16647 } 16648 16649 /** 16650 * Construct a shadow builder object with no associated View. This 16651 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 16652 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 16653 * to supply the drag shadow's dimensions and appearance without 16654 * reference to any View object. If they are not overridden, then the result is an 16655 * invisible drag shadow. 16656 */ 16657 public DragShadowBuilder() { 16658 mView = new WeakReference<View>(null); 16659 } 16660 16661 /** 16662 * Returns the View object that had been passed to the 16663 * {@link #View.DragShadowBuilder(View)} 16664 * constructor. If that View parameter was {@code null} or if the 16665 * {@link #View.DragShadowBuilder()} 16666 * constructor was used to instantiate the builder object, this method will return 16667 * null. 16668 * 16669 * @return The View object associate with this builder object. 16670 */ 16671 @SuppressWarnings({"JavadocReference"}) 16672 final public View getView() { 16673 return mView.get(); 16674 } 16675 16676 /** 16677 * Provides the metrics for the shadow image. These include the dimensions of 16678 * the shadow image, and the point within that shadow that should 16679 * be centered under the touch location while dragging. 16680 * <p> 16681 * The default implementation sets the dimensions of the shadow to be the 16682 * same as the dimensions of the View itself and centers the shadow under 16683 * the touch point. 16684 * </p> 16685 * 16686 * @param shadowSize A {@link android.graphics.Point} containing the width and height 16687 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 16688 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 16689 * image. 16690 * 16691 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 16692 * shadow image that should be underneath the touch point during the drag and drop 16693 * operation. Your application must set {@link android.graphics.Point#x} to the 16694 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 16695 */ 16696 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 16697 final View view = mView.get(); 16698 if (view != null) { 16699 shadowSize.set(view.getWidth(), view.getHeight()); 16700 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 16701 } else { 16702 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 16703 } 16704 } 16705 16706 /** 16707 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 16708 * based on the dimensions it received from the 16709 * {@link #onProvideShadowMetrics(Point, Point)} callback. 16710 * 16711 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 16712 */ 16713 public void onDrawShadow(Canvas canvas) { 16714 final View view = mView.get(); 16715 if (view != null) { 16716 view.draw(canvas); 16717 } else { 16718 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 16719 } 16720 } 16721 } 16722 16723 /** 16724 * Starts a drag and drop operation. When your application calls this method, it passes a 16725 * {@link android.view.View.DragShadowBuilder} object to the system. The 16726 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 16727 * to get metrics for the drag shadow, and then calls the object's 16728 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 16729 * <p> 16730 * Once the system has the drag shadow, it begins the drag and drop operation by sending 16731 * drag events to all the View objects in your application that are currently visible. It does 16732 * this either by calling the View object's drag listener (an implementation of 16733 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 16734 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 16735 * Both are passed a {@link android.view.DragEvent} object that has a 16736 * {@link android.view.DragEvent#getAction()} value of 16737 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 16738 * </p> 16739 * <p> 16740 * Your application can invoke startDrag() on any attached View object. The View object does not 16741 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 16742 * be related to the View the user selected for dragging. 16743 * </p> 16744 * @param data A {@link android.content.ClipData} object pointing to the data to be 16745 * transferred by the drag and drop operation. 16746 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 16747 * drag shadow. 16748 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 16749 * drop operation. This Object is put into every DragEvent object sent by the system during the 16750 * current drag. 16751 * <p> 16752 * myLocalState is a lightweight mechanism for the sending information from the dragged View 16753 * to the target Views. For example, it can contain flags that differentiate between a 16754 * a copy operation and a move operation. 16755 * </p> 16756 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 16757 * so the parameter should be set to 0. 16758 * @return {@code true} if the method completes successfully, or 16759 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 16760 * do a drag, and so no drag operation is in progress. 16761 */ 16762 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 16763 Object myLocalState, int flags) { 16764 if (ViewDebug.DEBUG_DRAG) { 16765 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 16766 } 16767 boolean okay = false; 16768 16769 Point shadowSize = new Point(); 16770 Point shadowTouchPoint = new Point(); 16771 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 16772 16773 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 16774 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 16775 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 16776 } 16777 16778 if (ViewDebug.DEBUG_DRAG) { 16779 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 16780 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 16781 } 16782 Surface surface = new Surface(); 16783 try { 16784 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 16785 flags, shadowSize.x, shadowSize.y, surface); 16786 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 16787 + " surface=" + surface); 16788 if (token != null) { 16789 Canvas canvas = surface.lockCanvas(null); 16790 try { 16791 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 16792 shadowBuilder.onDrawShadow(canvas); 16793 } finally { 16794 surface.unlockCanvasAndPost(canvas); 16795 } 16796 16797 final ViewRootImpl root = getViewRootImpl(); 16798 16799 // Cache the local state object for delivery with DragEvents 16800 root.setLocalDragState(myLocalState); 16801 16802 // repurpose 'shadowSize' for the last touch point 16803 root.getLastTouchPoint(shadowSize); 16804 16805 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 16806 shadowSize.x, shadowSize.y, 16807 shadowTouchPoint.x, shadowTouchPoint.y, data); 16808 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 16809 16810 // Off and running! Release our local surface instance; the drag 16811 // shadow surface is now managed by the system process. 16812 surface.release(); 16813 } 16814 } catch (Exception e) { 16815 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 16816 surface.destroy(); 16817 } 16818 16819 return okay; 16820 } 16821 16822 /** 16823 * Handles drag events sent by the system following a call to 16824 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 16825 *<p> 16826 * When the system calls this method, it passes a 16827 * {@link android.view.DragEvent} object. A call to 16828 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 16829 * in DragEvent. The method uses these to determine what is happening in the drag and drop 16830 * operation. 16831 * @param event The {@link android.view.DragEvent} sent by the system. 16832 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 16833 * in DragEvent, indicating the type of drag event represented by this object. 16834 * @return {@code true} if the method was successful, otherwise {@code false}. 16835 * <p> 16836 * The method should return {@code true} in response to an action type of 16837 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 16838 * operation. 16839 * </p> 16840 * <p> 16841 * The method should also return {@code true} in response to an action type of 16842 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 16843 * {@code false} if it didn't. 16844 * </p> 16845 */ 16846 public boolean onDragEvent(DragEvent event) { 16847 return false; 16848 } 16849 16850 /** 16851 * Detects if this View is enabled and has a drag event listener. 16852 * If both are true, then it calls the drag event listener with the 16853 * {@link android.view.DragEvent} it received. If the drag event listener returns 16854 * {@code true}, then dispatchDragEvent() returns {@code true}. 16855 * <p> 16856 * For all other cases, the method calls the 16857 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 16858 * method and returns its result. 16859 * </p> 16860 * <p> 16861 * This ensures that a drag event is always consumed, even if the View does not have a drag 16862 * event listener. However, if the View has a listener and the listener returns true, then 16863 * onDragEvent() is not called. 16864 * </p> 16865 */ 16866 public boolean dispatchDragEvent(DragEvent event) { 16867 ListenerInfo li = mListenerInfo; 16868 //noinspection SimplifiableIfStatement 16869 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 16870 && li.mOnDragListener.onDrag(this, event)) { 16871 return true; 16872 } 16873 return onDragEvent(event); 16874 } 16875 16876 boolean canAcceptDrag() { 16877 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 16878 } 16879 16880 /** 16881 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 16882 * it is ever exposed at all. 16883 * @hide 16884 */ 16885 public void onCloseSystemDialogs(String reason) { 16886 } 16887 16888 /** 16889 * Given a Drawable whose bounds have been set to draw into this view, 16890 * update a Region being computed for 16891 * {@link #gatherTransparentRegion(android.graphics.Region)} so 16892 * that any non-transparent parts of the Drawable are removed from the 16893 * given transparent region. 16894 * 16895 * @param dr The Drawable whose transparency is to be applied to the region. 16896 * @param region A Region holding the current transparency information, 16897 * where any parts of the region that are set are considered to be 16898 * transparent. On return, this region will be modified to have the 16899 * transparency information reduced by the corresponding parts of the 16900 * Drawable that are not transparent. 16901 * {@hide} 16902 */ 16903 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 16904 if (DBG) { 16905 Log.i("View", "Getting transparent region for: " + this); 16906 } 16907 final Region r = dr.getTransparentRegion(); 16908 final Rect db = dr.getBounds(); 16909 final AttachInfo attachInfo = mAttachInfo; 16910 if (r != null && attachInfo != null) { 16911 final int w = getRight()-getLeft(); 16912 final int h = getBottom()-getTop(); 16913 if (db.left > 0) { 16914 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 16915 r.op(0, 0, db.left, h, Region.Op.UNION); 16916 } 16917 if (db.right < w) { 16918 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 16919 r.op(db.right, 0, w, h, Region.Op.UNION); 16920 } 16921 if (db.top > 0) { 16922 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 16923 r.op(0, 0, w, db.top, Region.Op.UNION); 16924 } 16925 if (db.bottom < h) { 16926 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 16927 r.op(0, db.bottom, w, h, Region.Op.UNION); 16928 } 16929 final int[] location = attachInfo.mTransparentLocation; 16930 getLocationInWindow(location); 16931 r.translate(location[0], location[1]); 16932 region.op(r, Region.Op.INTERSECT); 16933 } else { 16934 region.op(db, Region.Op.DIFFERENCE); 16935 } 16936 } 16937 16938 private void checkForLongClick(int delayOffset) { 16939 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 16940 mHasPerformedLongPress = false; 16941 16942 if (mPendingCheckForLongPress == null) { 16943 mPendingCheckForLongPress = new CheckForLongPress(); 16944 } 16945 mPendingCheckForLongPress.rememberWindowAttachCount(); 16946 postDelayed(mPendingCheckForLongPress, 16947 ViewConfiguration.getLongPressTimeout() - delayOffset); 16948 } 16949 } 16950 16951 /** 16952 * Inflate a view from an XML resource. This convenience method wraps the {@link 16953 * LayoutInflater} class, which provides a full range of options for view inflation. 16954 * 16955 * @param context The Context object for your activity or application. 16956 * @param resource The resource ID to inflate 16957 * @param root A view group that will be the parent. Used to properly inflate the 16958 * layout_* parameters. 16959 * @see LayoutInflater 16960 */ 16961 public static View inflate(Context context, int resource, ViewGroup root) { 16962 LayoutInflater factory = LayoutInflater.from(context); 16963 return factory.inflate(resource, root); 16964 } 16965 16966 /** 16967 * Scroll the view with standard behavior for scrolling beyond the normal 16968 * content boundaries. Views that call this method should override 16969 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 16970 * results of an over-scroll operation. 16971 * 16972 * Views can use this method to handle any touch or fling-based scrolling. 16973 * 16974 * @param deltaX Change in X in pixels 16975 * @param deltaY Change in Y in pixels 16976 * @param scrollX Current X scroll value in pixels before applying deltaX 16977 * @param scrollY Current Y scroll value in pixels before applying deltaY 16978 * @param scrollRangeX Maximum content scroll range along the X axis 16979 * @param scrollRangeY Maximum content scroll range along the Y axis 16980 * @param maxOverScrollX Number of pixels to overscroll by in either direction 16981 * along the X axis. 16982 * @param maxOverScrollY Number of pixels to overscroll by in either direction 16983 * along the Y axis. 16984 * @param isTouchEvent true if this scroll operation is the result of a touch event. 16985 * @return true if scrolling was clamped to an over-scroll boundary along either 16986 * axis, false otherwise. 16987 */ 16988 @SuppressWarnings({"UnusedParameters"}) 16989 protected boolean overScrollBy(int deltaX, int deltaY, 16990 int scrollX, int scrollY, 16991 int scrollRangeX, int scrollRangeY, 16992 int maxOverScrollX, int maxOverScrollY, 16993 boolean isTouchEvent) { 16994 final int overScrollMode = mOverScrollMode; 16995 final boolean canScrollHorizontal = 16996 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 16997 final boolean canScrollVertical = 16998 computeVerticalScrollRange() > computeVerticalScrollExtent(); 16999 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 17000 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 17001 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 17002 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 17003 17004 int newScrollX = scrollX + deltaX; 17005 if (!overScrollHorizontal) { 17006 maxOverScrollX = 0; 17007 } 17008 17009 int newScrollY = scrollY + deltaY; 17010 if (!overScrollVertical) { 17011 maxOverScrollY = 0; 17012 } 17013 17014 // Clamp values if at the limits and record 17015 final int left = -maxOverScrollX; 17016 final int right = maxOverScrollX + scrollRangeX; 17017 final int top = -maxOverScrollY; 17018 final int bottom = maxOverScrollY + scrollRangeY; 17019 17020 boolean clampedX = false; 17021 if (newScrollX > right) { 17022 newScrollX = right; 17023 clampedX = true; 17024 } else if (newScrollX < left) { 17025 newScrollX = left; 17026 clampedX = true; 17027 } 17028 17029 boolean clampedY = false; 17030 if (newScrollY > bottom) { 17031 newScrollY = bottom; 17032 clampedY = true; 17033 } else if (newScrollY < top) { 17034 newScrollY = top; 17035 clampedY = true; 17036 } 17037 17038 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 17039 17040 return clampedX || clampedY; 17041 } 17042 17043 /** 17044 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 17045 * respond to the results of an over-scroll operation. 17046 * 17047 * @param scrollX New X scroll value in pixels 17048 * @param scrollY New Y scroll value in pixels 17049 * @param clampedX True if scrollX was clamped to an over-scroll boundary 17050 * @param clampedY True if scrollY was clamped to an over-scroll boundary 17051 */ 17052 protected void onOverScrolled(int scrollX, int scrollY, 17053 boolean clampedX, boolean clampedY) { 17054 // Intentionally empty. 17055 } 17056 17057 /** 17058 * Returns the over-scroll mode for this view. The result will be 17059 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17060 * (allow over-scrolling only if the view content is larger than the container), 17061 * or {@link #OVER_SCROLL_NEVER}. 17062 * 17063 * @return This view's over-scroll mode. 17064 */ 17065 public int getOverScrollMode() { 17066 return mOverScrollMode; 17067 } 17068 17069 /** 17070 * Set the over-scroll mode for this view. Valid over-scroll modes are 17071 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17072 * (allow over-scrolling only if the view content is larger than the container), 17073 * or {@link #OVER_SCROLL_NEVER}. 17074 * 17075 * Setting the over-scroll mode of a view will have an effect only if the 17076 * view is capable of scrolling. 17077 * 17078 * @param overScrollMode The new over-scroll mode for this view. 17079 */ 17080 public void setOverScrollMode(int overScrollMode) { 17081 if (overScrollMode != OVER_SCROLL_ALWAYS && 17082 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 17083 overScrollMode != OVER_SCROLL_NEVER) { 17084 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 17085 } 17086 mOverScrollMode = overScrollMode; 17087 } 17088 17089 /** 17090 * Gets a scale factor that determines the distance the view should scroll 17091 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 17092 * @return The vertical scroll scale factor. 17093 * @hide 17094 */ 17095 protected float getVerticalScrollFactor() { 17096 if (mVerticalScrollFactor == 0) { 17097 TypedValue outValue = new TypedValue(); 17098 if (!mContext.getTheme().resolveAttribute( 17099 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 17100 throw new IllegalStateException( 17101 "Expected theme to define listPreferredItemHeight."); 17102 } 17103 mVerticalScrollFactor = outValue.getDimension( 17104 mContext.getResources().getDisplayMetrics()); 17105 } 17106 return mVerticalScrollFactor; 17107 } 17108 17109 /** 17110 * Gets a scale factor that determines the distance the view should scroll 17111 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 17112 * @return The horizontal scroll scale factor. 17113 * @hide 17114 */ 17115 protected float getHorizontalScrollFactor() { 17116 // TODO: Should use something else. 17117 return getVerticalScrollFactor(); 17118 } 17119 17120 /** 17121 * Return the value specifying the text direction or policy that was set with 17122 * {@link #setTextDirection(int)}. 17123 * 17124 * @return the defined text direction. It can be one of: 17125 * 17126 * {@link #TEXT_DIRECTION_INHERIT}, 17127 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17128 * {@link #TEXT_DIRECTION_ANY_RTL}, 17129 * {@link #TEXT_DIRECTION_LTR}, 17130 * {@link #TEXT_DIRECTION_RTL}, 17131 * {@link #TEXT_DIRECTION_LOCALE} 17132 * 17133 * @attr ref android.R.styleable#View_textDirection 17134 * 17135 * @hide 17136 */ 17137 @ViewDebug.ExportedProperty(category = "text", mapping = { 17138 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17139 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17140 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17141 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17142 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17143 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17144 }) 17145 public int getRawTextDirection() { 17146 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 17147 } 17148 17149 /** 17150 * Set the text direction. 17151 * 17152 * @param textDirection the direction to set. Should be one of: 17153 * 17154 * {@link #TEXT_DIRECTION_INHERIT}, 17155 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17156 * {@link #TEXT_DIRECTION_ANY_RTL}, 17157 * {@link #TEXT_DIRECTION_LTR}, 17158 * {@link #TEXT_DIRECTION_RTL}, 17159 * {@link #TEXT_DIRECTION_LOCALE} 17160 * 17161 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 17162 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 17163 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 17164 * 17165 * @attr ref android.R.styleable#View_textDirection 17166 */ 17167 public void setTextDirection(int textDirection) { 17168 if (getRawTextDirection() != textDirection) { 17169 // Reset the current text direction and the resolved one 17170 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 17171 resetResolvedTextDirection(); 17172 // Set the new text direction 17173 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 17174 // Do resolution 17175 resolveTextDirection(); 17176 // Notify change 17177 onRtlPropertiesChanged(getLayoutDirection()); 17178 // Refresh 17179 requestLayout(); 17180 invalidate(true); 17181 } 17182 } 17183 17184 /** 17185 * Return the resolved text direction. 17186 * 17187 * @return the resolved text direction. Returns one of: 17188 * 17189 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17190 * {@link #TEXT_DIRECTION_ANY_RTL}, 17191 * {@link #TEXT_DIRECTION_LTR}, 17192 * {@link #TEXT_DIRECTION_RTL}, 17193 * {@link #TEXT_DIRECTION_LOCALE} 17194 * 17195 * @attr ref android.R.styleable#View_textDirection 17196 */ 17197 @ViewDebug.ExportedProperty(category = "text", mapping = { 17198 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17199 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17200 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17201 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17202 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17203 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17204 }) 17205 public int getTextDirection() { 17206 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 17207 } 17208 17209 /** 17210 * Resolve the text direction. 17211 * 17212 * @return true if resolution has been done, false otherwise. 17213 * 17214 * @hide 17215 */ 17216 public boolean resolveTextDirection() { 17217 // Reset any previous text direction resolution 17218 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17219 17220 if (hasRtlSupport()) { 17221 // Set resolved text direction flag depending on text direction flag 17222 final int textDirection = getRawTextDirection(); 17223 switch(textDirection) { 17224 case TEXT_DIRECTION_INHERIT: 17225 if (!canResolveTextDirection()) { 17226 // We cannot do the resolution if there is no parent, so use the default one 17227 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17228 // Resolution will need to happen again later 17229 return false; 17230 } 17231 17232 // Parent has not yet resolved, so we still return the default 17233 try { 17234 if (!mParent.isTextDirectionResolved()) { 17235 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17236 // Resolution will need to happen again later 17237 return false; 17238 } 17239 } catch (AbstractMethodError e) { 17240 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17241 " does not fully implement ViewParent", e); 17242 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED | 17243 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17244 return true; 17245 } 17246 17247 // Set current resolved direction to the same value as the parent's one 17248 int parentResolvedDirection; 17249 try { 17250 parentResolvedDirection = mParent.getTextDirection(); 17251 } catch (AbstractMethodError e) { 17252 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17253 " does not fully implement ViewParent", e); 17254 parentResolvedDirection = TEXT_DIRECTION_LTR; 17255 } 17256 switch (parentResolvedDirection) { 17257 case TEXT_DIRECTION_FIRST_STRONG: 17258 case TEXT_DIRECTION_ANY_RTL: 17259 case TEXT_DIRECTION_LTR: 17260 case TEXT_DIRECTION_RTL: 17261 case TEXT_DIRECTION_LOCALE: 17262 mPrivateFlags2 |= 17263 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17264 break; 17265 default: 17266 // Default resolved direction is "first strong" heuristic 17267 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17268 } 17269 break; 17270 case TEXT_DIRECTION_FIRST_STRONG: 17271 case TEXT_DIRECTION_ANY_RTL: 17272 case TEXT_DIRECTION_LTR: 17273 case TEXT_DIRECTION_RTL: 17274 case TEXT_DIRECTION_LOCALE: 17275 // Resolved direction is the same as text direction 17276 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17277 break; 17278 default: 17279 // Default resolved direction is "first strong" heuristic 17280 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17281 } 17282 } else { 17283 // Default resolved direction is "first strong" heuristic 17284 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17285 } 17286 17287 // Set to resolved 17288 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 17289 return true; 17290 } 17291 17292 /** 17293 * Check if text direction resolution can be done. 17294 * 17295 * @return true if text direction resolution can be done otherwise return false. 17296 */ 17297 public boolean canResolveTextDirection() { 17298 switch (getRawTextDirection()) { 17299 case TEXT_DIRECTION_INHERIT: 17300 if (mParent != null) { 17301 try { 17302 return mParent.canResolveTextDirection(); 17303 } catch (AbstractMethodError e) { 17304 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17305 " does not fully implement ViewParent", e); 17306 } 17307 } 17308 return false; 17309 17310 default: 17311 return true; 17312 } 17313 } 17314 17315 /** 17316 * Reset resolved text direction. Text direction will be resolved during a call to 17317 * {@link #onMeasure(int, int)}. 17318 * 17319 * @hide 17320 */ 17321 public void resetResolvedTextDirection() { 17322 // Reset any previous text direction resolution 17323 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17324 // Set to default value 17325 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17326 } 17327 17328 /** 17329 * @return true if text direction is inherited. 17330 * 17331 * @hide 17332 */ 17333 public boolean isTextDirectionInherited() { 17334 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 17335 } 17336 17337 /** 17338 * @return true if text direction is resolved. 17339 */ 17340 public boolean isTextDirectionResolved() { 17341 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 17342 } 17343 17344 /** 17345 * Return the value specifying the text alignment or policy that was set with 17346 * {@link #setTextAlignment(int)}. 17347 * 17348 * @return the defined text alignment. It can be one of: 17349 * 17350 * {@link #TEXT_ALIGNMENT_INHERIT}, 17351 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17352 * {@link #TEXT_ALIGNMENT_CENTER}, 17353 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17354 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17355 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17356 * {@link #TEXT_ALIGNMENT_VIEW_END} 17357 * 17358 * @attr ref android.R.styleable#View_textAlignment 17359 * 17360 * @hide 17361 */ 17362 @ViewDebug.ExportedProperty(category = "text", mapping = { 17363 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17364 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17365 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17366 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17367 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17368 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17369 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17370 }) 17371 public int getRawTextAlignment() { 17372 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 17373 } 17374 17375 /** 17376 * Set the text alignment. 17377 * 17378 * @param textAlignment The text alignment to set. Should be one of 17379 * 17380 * {@link #TEXT_ALIGNMENT_INHERIT}, 17381 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17382 * {@link #TEXT_ALIGNMENT_CENTER}, 17383 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17384 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17385 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17386 * {@link #TEXT_ALIGNMENT_VIEW_END} 17387 * 17388 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 17389 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 17390 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 17391 * 17392 * @attr ref android.R.styleable#View_textAlignment 17393 */ 17394 public void setTextAlignment(int textAlignment) { 17395 if (textAlignment != getRawTextAlignment()) { 17396 // Reset the current and resolved text alignment 17397 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 17398 resetResolvedTextAlignment(); 17399 // Set the new text alignment 17400 mPrivateFlags2 |= 17401 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 17402 // Do resolution 17403 resolveTextAlignment(); 17404 // Notify change 17405 onRtlPropertiesChanged(getLayoutDirection()); 17406 // Refresh 17407 requestLayout(); 17408 invalidate(true); 17409 } 17410 } 17411 17412 /** 17413 * Return the resolved text alignment. 17414 * 17415 * @return the resolved text alignment. Returns one of: 17416 * 17417 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17418 * {@link #TEXT_ALIGNMENT_CENTER}, 17419 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17420 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17421 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17422 * {@link #TEXT_ALIGNMENT_VIEW_END} 17423 * 17424 * @attr ref android.R.styleable#View_textAlignment 17425 */ 17426 @ViewDebug.ExportedProperty(category = "text", mapping = { 17427 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17428 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17429 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17430 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17431 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17432 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17433 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17434 }) 17435 public int getTextAlignment() { 17436 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 17437 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 17438 } 17439 17440 /** 17441 * Resolve the text alignment. 17442 * 17443 * @return true if resolution has been done, false otherwise. 17444 * 17445 * @hide 17446 */ 17447 public boolean resolveTextAlignment() { 17448 // Reset any previous text alignment resolution 17449 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17450 17451 if (hasRtlSupport()) { 17452 // Set resolved text alignment flag depending on text alignment flag 17453 final int textAlignment = getRawTextAlignment(); 17454 switch (textAlignment) { 17455 case TEXT_ALIGNMENT_INHERIT: 17456 // Check if we can resolve the text alignment 17457 if (!canResolveTextAlignment()) { 17458 // We cannot do the resolution if there is no parent so use the default 17459 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17460 // Resolution will need to happen again later 17461 return false; 17462 } 17463 17464 // Parent has not yet resolved, so we still return the default 17465 try { 17466 if (!mParent.isTextAlignmentResolved()) { 17467 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17468 // Resolution will need to happen again later 17469 return false; 17470 } 17471 } catch (AbstractMethodError e) { 17472 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17473 " does not fully implement ViewParent", e); 17474 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED | 17475 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17476 return true; 17477 } 17478 17479 int parentResolvedTextAlignment; 17480 try { 17481 parentResolvedTextAlignment = mParent.getTextAlignment(); 17482 } catch (AbstractMethodError e) { 17483 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17484 " does not fully implement ViewParent", e); 17485 parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY; 17486 } 17487 switch (parentResolvedTextAlignment) { 17488 case TEXT_ALIGNMENT_GRAVITY: 17489 case TEXT_ALIGNMENT_TEXT_START: 17490 case TEXT_ALIGNMENT_TEXT_END: 17491 case TEXT_ALIGNMENT_CENTER: 17492 case TEXT_ALIGNMENT_VIEW_START: 17493 case TEXT_ALIGNMENT_VIEW_END: 17494 // Resolved text alignment is the same as the parent resolved 17495 // text alignment 17496 mPrivateFlags2 |= 17497 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17498 break; 17499 default: 17500 // Use default resolved text alignment 17501 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17502 } 17503 break; 17504 case TEXT_ALIGNMENT_GRAVITY: 17505 case TEXT_ALIGNMENT_TEXT_START: 17506 case TEXT_ALIGNMENT_TEXT_END: 17507 case TEXT_ALIGNMENT_CENTER: 17508 case TEXT_ALIGNMENT_VIEW_START: 17509 case TEXT_ALIGNMENT_VIEW_END: 17510 // Resolved text alignment is the same as text alignment 17511 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17512 break; 17513 default: 17514 // Use default resolved text alignment 17515 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17516 } 17517 } else { 17518 // Use default resolved text alignment 17519 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17520 } 17521 17522 // Set the resolved 17523 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17524 return true; 17525 } 17526 17527 /** 17528 * Check if text alignment resolution can be done. 17529 * 17530 * @return true if text alignment resolution can be done otherwise return false. 17531 */ 17532 public boolean canResolveTextAlignment() { 17533 switch (getRawTextAlignment()) { 17534 case TEXT_DIRECTION_INHERIT: 17535 if (mParent != null) { 17536 try { 17537 return mParent.canResolveTextAlignment(); 17538 } catch (AbstractMethodError e) { 17539 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17540 " does not fully implement ViewParent", e); 17541 } 17542 } 17543 return false; 17544 17545 default: 17546 return true; 17547 } 17548 } 17549 17550 /** 17551 * Reset resolved text alignment. Text alignment will be resolved during a call to 17552 * {@link #onMeasure(int, int)}. 17553 * 17554 * @hide 17555 */ 17556 public void resetResolvedTextAlignment() { 17557 // Reset any previous text alignment resolution 17558 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17559 // Set to default 17560 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17561 } 17562 17563 /** 17564 * @return true if text alignment is inherited. 17565 * 17566 * @hide 17567 */ 17568 public boolean isTextAlignmentInherited() { 17569 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 17570 } 17571 17572 /** 17573 * @return true if text alignment is resolved. 17574 */ 17575 public boolean isTextAlignmentResolved() { 17576 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17577 } 17578 17579 /** 17580 * Generate a value suitable for use in {@link #setId(int)}. 17581 * This value will not collide with ID values generated at build time by aapt for R.id. 17582 * 17583 * @return a generated ID value 17584 */ 17585 public static int generateViewId() { 17586 for (;;) { 17587 final int result = sNextGeneratedId.get(); 17588 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 17589 int newValue = result + 1; 17590 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 17591 if (sNextGeneratedId.compareAndSet(result, newValue)) { 17592 return result; 17593 } 17594 } 17595 } 17596 17597 // 17598 // Properties 17599 // 17600 /** 17601 * A Property wrapper around the <code>alpha</code> functionality handled by the 17602 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 17603 */ 17604 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 17605 @Override 17606 public void setValue(View object, float value) { 17607 object.setAlpha(value); 17608 } 17609 17610 @Override 17611 public Float get(View object) { 17612 return object.getAlpha(); 17613 } 17614 }; 17615 17616 /** 17617 * A Property wrapper around the <code>translationX</code> functionality handled by the 17618 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 17619 */ 17620 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 17621 @Override 17622 public void setValue(View object, float value) { 17623 object.setTranslationX(value); 17624 } 17625 17626 @Override 17627 public Float get(View object) { 17628 return object.getTranslationX(); 17629 } 17630 }; 17631 17632 /** 17633 * A Property wrapper around the <code>translationY</code> functionality handled by the 17634 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 17635 */ 17636 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 17637 @Override 17638 public void setValue(View object, float value) { 17639 object.setTranslationY(value); 17640 } 17641 17642 @Override 17643 public Float get(View object) { 17644 return object.getTranslationY(); 17645 } 17646 }; 17647 17648 /** 17649 * A Property wrapper around the <code>x</code> functionality handled by the 17650 * {@link View#setX(float)} and {@link View#getX()} methods. 17651 */ 17652 public static final Property<View, Float> X = new FloatProperty<View>("x") { 17653 @Override 17654 public void setValue(View object, float value) { 17655 object.setX(value); 17656 } 17657 17658 @Override 17659 public Float get(View object) { 17660 return object.getX(); 17661 } 17662 }; 17663 17664 /** 17665 * A Property wrapper around the <code>y</code> functionality handled by the 17666 * {@link View#setY(float)} and {@link View#getY()} methods. 17667 */ 17668 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 17669 @Override 17670 public void setValue(View object, float value) { 17671 object.setY(value); 17672 } 17673 17674 @Override 17675 public Float get(View object) { 17676 return object.getY(); 17677 } 17678 }; 17679 17680 /** 17681 * A Property wrapper around the <code>rotation</code> functionality handled by the 17682 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 17683 */ 17684 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 17685 @Override 17686 public void setValue(View object, float value) { 17687 object.setRotation(value); 17688 } 17689 17690 @Override 17691 public Float get(View object) { 17692 return object.getRotation(); 17693 } 17694 }; 17695 17696 /** 17697 * A Property wrapper around the <code>rotationX</code> functionality handled by the 17698 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 17699 */ 17700 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 17701 @Override 17702 public void setValue(View object, float value) { 17703 object.setRotationX(value); 17704 } 17705 17706 @Override 17707 public Float get(View object) { 17708 return object.getRotationX(); 17709 } 17710 }; 17711 17712 /** 17713 * A Property wrapper around the <code>rotationY</code> functionality handled by the 17714 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 17715 */ 17716 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 17717 @Override 17718 public void setValue(View object, float value) { 17719 object.setRotationY(value); 17720 } 17721 17722 @Override 17723 public Float get(View object) { 17724 return object.getRotationY(); 17725 } 17726 }; 17727 17728 /** 17729 * A Property wrapper around the <code>scaleX</code> functionality handled by the 17730 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 17731 */ 17732 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 17733 @Override 17734 public void setValue(View object, float value) { 17735 object.setScaleX(value); 17736 } 17737 17738 @Override 17739 public Float get(View object) { 17740 return object.getScaleX(); 17741 } 17742 }; 17743 17744 /** 17745 * A Property wrapper around the <code>scaleY</code> functionality handled by the 17746 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 17747 */ 17748 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 17749 @Override 17750 public void setValue(View object, float value) { 17751 object.setScaleY(value); 17752 } 17753 17754 @Override 17755 public Float get(View object) { 17756 return object.getScaleY(); 17757 } 17758 }; 17759 17760 /** 17761 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 17762 * Each MeasureSpec represents a requirement for either the width or the height. 17763 * A MeasureSpec is comprised of a size and a mode. There are three possible 17764 * modes: 17765 * <dl> 17766 * <dt>UNSPECIFIED</dt> 17767 * <dd> 17768 * The parent has not imposed any constraint on the child. It can be whatever size 17769 * it wants. 17770 * </dd> 17771 * 17772 * <dt>EXACTLY</dt> 17773 * <dd> 17774 * The parent has determined an exact size for the child. The child is going to be 17775 * given those bounds regardless of how big it wants to be. 17776 * </dd> 17777 * 17778 * <dt>AT_MOST</dt> 17779 * <dd> 17780 * The child can be as large as it wants up to the specified size. 17781 * </dd> 17782 * </dl> 17783 * 17784 * MeasureSpecs are implemented as ints to reduce object allocation. This class 17785 * is provided to pack and unpack the <size, mode> tuple into the int. 17786 */ 17787 public static class MeasureSpec { 17788 private static final int MODE_SHIFT = 30; 17789 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 17790 17791 /** 17792 * Measure specification mode: The parent has not imposed any constraint 17793 * on the child. It can be whatever size it wants. 17794 */ 17795 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 17796 17797 /** 17798 * Measure specification mode: The parent has determined an exact size 17799 * for the child. The child is going to be given those bounds regardless 17800 * of how big it wants to be. 17801 */ 17802 public static final int EXACTLY = 1 << MODE_SHIFT; 17803 17804 /** 17805 * Measure specification mode: The child can be as large as it wants up 17806 * to the specified size. 17807 */ 17808 public static final int AT_MOST = 2 << MODE_SHIFT; 17809 17810 /** 17811 * Creates a measure specification based on the supplied size and mode. 17812 * 17813 * The mode must always be one of the following: 17814 * <ul> 17815 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 17816 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 17817 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 17818 * </ul> 17819 * 17820 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 17821 * implementation was such that the order of arguments did not matter 17822 * and overflow in either value could impact the resulting MeasureSpec. 17823 * {@link android.widget.RelativeLayout} was affected by this bug. 17824 * Apps targeting API levels greater than 17 will get the fixed, more strict 17825 * behavior.</p> 17826 * 17827 * @param size the size of the measure specification 17828 * @param mode the mode of the measure specification 17829 * @return the measure specification based on size and mode 17830 */ 17831 public static int makeMeasureSpec(int size, int mode) { 17832 if (sUseBrokenMakeMeasureSpec) { 17833 return size + mode; 17834 } else { 17835 return (size & ~MODE_MASK) | (mode & MODE_MASK); 17836 } 17837 } 17838 17839 /** 17840 * Extracts the mode from the supplied measure specification. 17841 * 17842 * @param measureSpec the measure specification to extract the mode from 17843 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 17844 * {@link android.view.View.MeasureSpec#AT_MOST} or 17845 * {@link android.view.View.MeasureSpec#EXACTLY} 17846 */ 17847 public static int getMode(int measureSpec) { 17848 return (measureSpec & MODE_MASK); 17849 } 17850 17851 /** 17852 * Extracts the size from the supplied measure specification. 17853 * 17854 * @param measureSpec the measure specification to extract the size from 17855 * @return the size in pixels defined in the supplied measure specification 17856 */ 17857 public static int getSize(int measureSpec) { 17858 return (measureSpec & ~MODE_MASK); 17859 } 17860 17861 static int adjust(int measureSpec, int delta) { 17862 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 17863 } 17864 17865 /** 17866 * Returns a String representation of the specified measure 17867 * specification. 17868 * 17869 * @param measureSpec the measure specification to convert to a String 17870 * @return a String with the following format: "MeasureSpec: MODE SIZE" 17871 */ 17872 public static String toString(int measureSpec) { 17873 int mode = getMode(measureSpec); 17874 int size = getSize(measureSpec); 17875 17876 StringBuilder sb = new StringBuilder("MeasureSpec: "); 17877 17878 if (mode == UNSPECIFIED) 17879 sb.append("UNSPECIFIED "); 17880 else if (mode == EXACTLY) 17881 sb.append("EXACTLY "); 17882 else if (mode == AT_MOST) 17883 sb.append("AT_MOST "); 17884 else 17885 sb.append(mode).append(" "); 17886 17887 sb.append(size); 17888 return sb.toString(); 17889 } 17890 } 17891 17892 class CheckForLongPress implements Runnable { 17893 17894 private int mOriginalWindowAttachCount; 17895 17896 public void run() { 17897 if (isPressed() && (mParent != null) 17898 && mOriginalWindowAttachCount == mWindowAttachCount) { 17899 if (performLongClick()) { 17900 mHasPerformedLongPress = true; 17901 } 17902 } 17903 } 17904 17905 public void rememberWindowAttachCount() { 17906 mOriginalWindowAttachCount = mWindowAttachCount; 17907 } 17908 } 17909 17910 private final class CheckForTap implements Runnable { 17911 public void run() { 17912 mPrivateFlags &= ~PFLAG_PREPRESSED; 17913 setPressed(true); 17914 checkForLongClick(ViewConfiguration.getTapTimeout()); 17915 } 17916 } 17917 17918 private final class PerformClick implements Runnable { 17919 public void run() { 17920 performClick(); 17921 } 17922 } 17923 17924 /** @hide */ 17925 public void hackTurnOffWindowResizeAnim(boolean off) { 17926 mAttachInfo.mTurnOffWindowResizeAnim = off; 17927 } 17928 17929 /** 17930 * This method returns a ViewPropertyAnimator object, which can be used to animate 17931 * specific properties on this View. 17932 * 17933 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 17934 */ 17935 public ViewPropertyAnimator animate() { 17936 if (mAnimator == null) { 17937 mAnimator = new ViewPropertyAnimator(this); 17938 } 17939 return mAnimator; 17940 } 17941 17942 /** 17943 * Set the current Scene that this view is in. The current scene is set only 17944 * on the root view of a scene, not for every view in that hierarchy. This 17945 * information is used by Scene to determine whether there is a previous 17946 * scene which should be exited before the new scene is entered. 17947 * 17948 * @param scene The new scene being set on the view 17949 * 17950 * @hide 17951 */ 17952 public void setCurrentScene(Scene scene) { 17953 mCurrentScene = scene; 17954 } 17955 17956 /** 17957 * Gets the current {@link Scene} set on this view. A scene is set on a view 17958 * only if that view is the scene root. 17959 * 17960 * @return The current Scene set on this view. A value of null indicates that 17961 * no Scene is current set. 17962 */ 17963 public Scene getCurrentScene() { 17964 return mCurrentScene; 17965 } 17966 17967 /** 17968 * Interface definition for a callback to be invoked when a hardware key event is 17969 * dispatched to this view. The callback will be invoked before the key event is 17970 * given to the view. This is only useful for hardware keyboards; a software input 17971 * method has no obligation to trigger this listener. 17972 */ 17973 public interface OnKeyListener { 17974 /** 17975 * Called when a hardware key is dispatched to a view. This allows listeners to 17976 * get a chance to respond before the target view. 17977 * <p>Key presses in software keyboards will generally NOT trigger this method, 17978 * although some may elect to do so in some situations. Do not assume a 17979 * software input method has to be key-based; even if it is, it may use key presses 17980 * in a different way than you expect, so there is no way to reliably catch soft 17981 * input key presses. 17982 * 17983 * @param v The view the key has been dispatched to. 17984 * @param keyCode The code for the physical key that was pressed 17985 * @param event The KeyEvent object containing full information about 17986 * the event. 17987 * @return True if the listener has consumed the event, false otherwise. 17988 */ 17989 boolean onKey(View v, int keyCode, KeyEvent event); 17990 } 17991 17992 /** 17993 * Interface definition for a callback to be invoked when a touch event is 17994 * dispatched to this view. The callback will be invoked before the touch 17995 * event is given to the view. 17996 */ 17997 public interface OnTouchListener { 17998 /** 17999 * Called when a touch event is dispatched to a view. This allows listeners to 18000 * get a chance to respond before the target view. 18001 * 18002 * @param v The view the touch event has been dispatched to. 18003 * @param event The MotionEvent object containing full information about 18004 * the event. 18005 * @return True if the listener has consumed the event, false otherwise. 18006 */ 18007 boolean onTouch(View v, MotionEvent event); 18008 } 18009 18010 /** 18011 * Interface definition for a callback to be invoked when a hover event is 18012 * dispatched to this view. The callback will be invoked before the hover 18013 * event is given to the view. 18014 */ 18015 public interface OnHoverListener { 18016 /** 18017 * Called when a hover event is dispatched to a view. This allows listeners to 18018 * get a chance to respond before the target view. 18019 * 18020 * @param v The view the hover event has been dispatched to. 18021 * @param event The MotionEvent object containing full information about 18022 * the event. 18023 * @return True if the listener has consumed the event, false otherwise. 18024 */ 18025 boolean onHover(View v, MotionEvent event); 18026 } 18027 18028 /** 18029 * Interface definition for a callback to be invoked when a generic motion event is 18030 * dispatched to this view. The callback will be invoked before the generic motion 18031 * event is given to the view. 18032 */ 18033 public interface OnGenericMotionListener { 18034 /** 18035 * Called when a generic motion event is dispatched to a view. This allows listeners to 18036 * get a chance to respond before the target view. 18037 * 18038 * @param v The view the generic motion event has been dispatched to. 18039 * @param event The MotionEvent object containing full information about 18040 * the event. 18041 * @return True if the listener has consumed the event, false otherwise. 18042 */ 18043 boolean onGenericMotion(View v, MotionEvent event); 18044 } 18045 18046 /** 18047 * Interface definition for a callback to be invoked when a view has been clicked and held. 18048 */ 18049 public interface OnLongClickListener { 18050 /** 18051 * Called when a view has been clicked and held. 18052 * 18053 * @param v The view that was clicked and held. 18054 * 18055 * @return true if the callback consumed the long click, false otherwise. 18056 */ 18057 boolean onLongClick(View v); 18058 } 18059 18060 /** 18061 * Interface definition for a callback to be invoked when a drag is being dispatched 18062 * to this view. The callback will be invoked before the hosting view's own 18063 * onDrag(event) method. If the listener wants to fall back to the hosting view's 18064 * onDrag(event) behavior, it should return 'false' from this callback. 18065 * 18066 * <div class="special reference"> 18067 * <h3>Developer Guides</h3> 18068 * <p>For a guide to implementing drag and drop features, read the 18069 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 18070 * </div> 18071 */ 18072 public interface OnDragListener { 18073 /** 18074 * Called when a drag event is dispatched to a view. This allows listeners 18075 * to get a chance to override base View behavior. 18076 * 18077 * @param v The View that received the drag event. 18078 * @param event The {@link android.view.DragEvent} object for the drag event. 18079 * @return {@code true} if the drag event was handled successfully, or {@code false} 18080 * if the drag event was not handled. Note that {@code false} will trigger the View 18081 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 18082 */ 18083 boolean onDrag(View v, DragEvent event); 18084 } 18085 18086 /** 18087 * Interface definition for a callback to be invoked when the focus state of 18088 * a view changed. 18089 */ 18090 public interface OnFocusChangeListener { 18091 /** 18092 * Called when the focus state of a view has changed. 18093 * 18094 * @param v The view whose state has changed. 18095 * @param hasFocus The new focus state of v. 18096 */ 18097 void onFocusChange(View v, boolean hasFocus); 18098 } 18099 18100 /** 18101 * Interface definition for a callback to be invoked when a view is clicked. 18102 */ 18103 public interface OnClickListener { 18104 /** 18105 * Called when a view has been clicked. 18106 * 18107 * @param v The view that was clicked. 18108 */ 18109 void onClick(View v); 18110 } 18111 18112 /** 18113 * Interface definition for a callback to be invoked when the context menu 18114 * for this view is being built. 18115 */ 18116 public interface OnCreateContextMenuListener { 18117 /** 18118 * Called when the context menu for this view is being built. It is not 18119 * safe to hold onto the menu after this method returns. 18120 * 18121 * @param menu The context menu that is being built 18122 * @param v The view for which the context menu is being built 18123 * @param menuInfo Extra information about the item for which the 18124 * context menu should be shown. This information will vary 18125 * depending on the class of v. 18126 */ 18127 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 18128 } 18129 18130 /** 18131 * Interface definition for a callback to be invoked when the status bar changes 18132 * visibility. This reports <strong>global</strong> changes to the system UI 18133 * state, not what the application is requesting. 18134 * 18135 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 18136 */ 18137 public interface OnSystemUiVisibilityChangeListener { 18138 /** 18139 * Called when the status bar changes visibility because of a call to 18140 * {@link View#setSystemUiVisibility(int)}. 18141 * 18142 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 18143 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 18144 * This tells you the <strong>global</strong> state of these UI visibility 18145 * flags, not what your app is currently applying. 18146 */ 18147 public void onSystemUiVisibilityChange(int visibility); 18148 } 18149 18150 /** 18151 * Interface definition for a callback to be invoked when this view is attached 18152 * or detached from its window. 18153 */ 18154 public interface OnAttachStateChangeListener { 18155 /** 18156 * Called when the view is attached to a window. 18157 * @param v The view that was attached 18158 */ 18159 public void onViewAttachedToWindow(View v); 18160 /** 18161 * Called when the view is detached from a window. 18162 * @param v The view that was detached 18163 */ 18164 public void onViewDetachedFromWindow(View v); 18165 } 18166 18167 private final class UnsetPressedState implements Runnable { 18168 public void run() { 18169 setPressed(false); 18170 } 18171 } 18172 18173 /** 18174 * Base class for derived classes that want to save and restore their own 18175 * state in {@link android.view.View#onSaveInstanceState()}. 18176 */ 18177 public static class BaseSavedState extends AbsSavedState { 18178 /** 18179 * Constructor used when reading from a parcel. Reads the state of the superclass. 18180 * 18181 * @param source 18182 */ 18183 public BaseSavedState(Parcel source) { 18184 super(source); 18185 } 18186 18187 /** 18188 * Constructor called by derived classes when creating their SavedState objects 18189 * 18190 * @param superState The state of the superclass of this view 18191 */ 18192 public BaseSavedState(Parcelable superState) { 18193 super(superState); 18194 } 18195 18196 public static final Parcelable.Creator<BaseSavedState> CREATOR = 18197 new Parcelable.Creator<BaseSavedState>() { 18198 public BaseSavedState createFromParcel(Parcel in) { 18199 return new BaseSavedState(in); 18200 } 18201 18202 public BaseSavedState[] newArray(int size) { 18203 return new BaseSavedState[size]; 18204 } 18205 }; 18206 } 18207 18208 /** 18209 * A set of information given to a view when it is attached to its parent 18210 * window. 18211 */ 18212 static class AttachInfo { 18213 interface Callbacks { 18214 void playSoundEffect(int effectId); 18215 boolean performHapticFeedback(int effectId, boolean always); 18216 } 18217 18218 /** 18219 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 18220 * to a Handler. This class contains the target (View) to invalidate and 18221 * the coordinates of the dirty rectangle. 18222 * 18223 * For performance purposes, this class also implements a pool of up to 18224 * POOL_LIMIT objects that get reused. This reduces memory allocations 18225 * whenever possible. 18226 */ 18227 static class InvalidateInfo { 18228 private static final int POOL_LIMIT = 10; 18229 18230 private static final SynchronizedPool<InvalidateInfo> sPool = 18231 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 18232 18233 View target; 18234 18235 int left; 18236 int top; 18237 int right; 18238 int bottom; 18239 18240 public static InvalidateInfo obtain() { 18241 InvalidateInfo instance = sPool.acquire(); 18242 return (instance != null) ? instance : new InvalidateInfo(); 18243 } 18244 18245 public void recycle() { 18246 target = null; 18247 sPool.release(this); 18248 } 18249 } 18250 18251 final IWindowSession mSession; 18252 18253 final IWindow mWindow; 18254 18255 final IBinder mWindowToken; 18256 18257 final Display mDisplay; 18258 18259 final Callbacks mRootCallbacks; 18260 18261 HardwareCanvas mHardwareCanvas; 18262 18263 IWindowId mIWindowId; 18264 WindowId mWindowId; 18265 18266 /** 18267 * The top view of the hierarchy. 18268 */ 18269 View mRootView; 18270 18271 IBinder mPanelParentWindowToken; 18272 Surface mSurface; 18273 18274 boolean mHardwareAccelerated; 18275 boolean mHardwareAccelerationRequested; 18276 HardwareRenderer mHardwareRenderer; 18277 18278 boolean mScreenOn; 18279 18280 /** 18281 * Scale factor used by the compatibility mode 18282 */ 18283 float mApplicationScale; 18284 18285 /** 18286 * Indicates whether the application is in compatibility mode 18287 */ 18288 boolean mScalingRequired; 18289 18290 /** 18291 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 18292 */ 18293 boolean mTurnOffWindowResizeAnim; 18294 18295 /** 18296 * Left position of this view's window 18297 */ 18298 int mWindowLeft; 18299 18300 /** 18301 * Top position of this view's window 18302 */ 18303 int mWindowTop; 18304 18305 /** 18306 * Indicates whether views need to use 32-bit drawing caches 18307 */ 18308 boolean mUse32BitDrawingCache; 18309 18310 /** 18311 * For windows that are full-screen but using insets to layout inside 18312 * of the screen areas, these are the current insets to appear inside 18313 * the overscan area of the display. 18314 */ 18315 final Rect mOverscanInsets = new Rect(); 18316 18317 /** 18318 * For windows that are full-screen but using insets to layout inside 18319 * of the screen decorations, these are the current insets for the 18320 * content of the window. 18321 */ 18322 final Rect mContentInsets = new Rect(); 18323 18324 /** 18325 * For windows that are full-screen but using insets to layout inside 18326 * of the screen decorations, these are the current insets for the 18327 * actual visible parts of the window. 18328 */ 18329 final Rect mVisibleInsets = new Rect(); 18330 18331 /** 18332 * The internal insets given by this window. This value is 18333 * supplied by the client (through 18334 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 18335 * be given to the window manager when changed to be used in laying 18336 * out windows behind it. 18337 */ 18338 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 18339 = new ViewTreeObserver.InternalInsetsInfo(); 18340 18341 /** 18342 * All views in the window's hierarchy that serve as scroll containers, 18343 * used to determine if the window can be resized or must be panned 18344 * to adjust for a soft input area. 18345 */ 18346 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 18347 18348 final KeyEvent.DispatcherState mKeyDispatchState 18349 = new KeyEvent.DispatcherState(); 18350 18351 /** 18352 * Indicates whether the view's window currently has the focus. 18353 */ 18354 boolean mHasWindowFocus; 18355 18356 /** 18357 * The current visibility of the window. 18358 */ 18359 int mWindowVisibility; 18360 18361 /** 18362 * Indicates the time at which drawing started to occur. 18363 */ 18364 long mDrawingTime; 18365 18366 /** 18367 * Indicates whether or not ignoring the DIRTY_MASK flags. 18368 */ 18369 boolean mIgnoreDirtyState; 18370 18371 /** 18372 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 18373 * to avoid clearing that flag prematurely. 18374 */ 18375 boolean mSetIgnoreDirtyState = false; 18376 18377 /** 18378 * Indicates whether the view's window is currently in touch mode. 18379 */ 18380 boolean mInTouchMode; 18381 18382 /** 18383 * Indicates that ViewAncestor should trigger a global layout change 18384 * the next time it performs a traversal 18385 */ 18386 boolean mRecomputeGlobalAttributes; 18387 18388 /** 18389 * Always report new attributes at next traversal. 18390 */ 18391 boolean mForceReportNewAttributes; 18392 18393 /** 18394 * Set during a traveral if any views want to keep the screen on. 18395 */ 18396 boolean mKeepScreenOn; 18397 18398 /** 18399 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 18400 */ 18401 int mSystemUiVisibility; 18402 18403 /** 18404 * Hack to force certain system UI visibility flags to be cleared. 18405 */ 18406 int mDisabledSystemUiVisibility; 18407 18408 /** 18409 * Last global system UI visibility reported by the window manager. 18410 */ 18411 int mGlobalSystemUiVisibility; 18412 18413 /** 18414 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 18415 * attached. 18416 */ 18417 boolean mHasSystemUiListeners; 18418 18419 /** 18420 * Set if the window has requested to extend into the overscan region 18421 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 18422 */ 18423 boolean mOverscanRequested; 18424 18425 /** 18426 * Set if the visibility of any views has changed. 18427 */ 18428 boolean mViewVisibilityChanged; 18429 18430 /** 18431 * Set to true if a view has been scrolled. 18432 */ 18433 boolean mViewScrollChanged; 18434 18435 /** 18436 * Global to the view hierarchy used as a temporary for dealing with 18437 * x/y points in the transparent region computations. 18438 */ 18439 final int[] mTransparentLocation = new int[2]; 18440 18441 /** 18442 * Global to the view hierarchy used as a temporary for dealing with 18443 * x/y points in the ViewGroup.invalidateChild implementation. 18444 */ 18445 final int[] mInvalidateChildLocation = new int[2]; 18446 18447 18448 /** 18449 * Global to the view hierarchy used as a temporary for dealing with 18450 * x/y location when view is transformed. 18451 */ 18452 final float[] mTmpTransformLocation = new float[2]; 18453 18454 /** 18455 * The view tree observer used to dispatch global events like 18456 * layout, pre-draw, touch mode change, etc. 18457 */ 18458 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 18459 18460 /** 18461 * A Canvas used by the view hierarchy to perform bitmap caching. 18462 */ 18463 Canvas mCanvas; 18464 18465 /** 18466 * The view root impl. 18467 */ 18468 final ViewRootImpl mViewRootImpl; 18469 18470 /** 18471 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 18472 * handler can be used to pump events in the UI events queue. 18473 */ 18474 final Handler mHandler; 18475 18476 /** 18477 * Temporary for use in computing invalidate rectangles while 18478 * calling up the hierarchy. 18479 */ 18480 final Rect mTmpInvalRect = new Rect(); 18481 18482 /** 18483 * Temporary for use in computing hit areas with transformed views 18484 */ 18485 final RectF mTmpTransformRect = new RectF(); 18486 18487 /** 18488 * Temporary for use in transforming invalidation rect 18489 */ 18490 final Matrix mTmpMatrix = new Matrix(); 18491 18492 /** 18493 * Temporary for use in transforming invalidation rect 18494 */ 18495 final Transformation mTmpTransformation = new Transformation(); 18496 18497 /** 18498 * Temporary list for use in collecting focusable descendents of a view. 18499 */ 18500 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 18501 18502 /** 18503 * The id of the window for accessibility purposes. 18504 */ 18505 int mAccessibilityWindowId = View.NO_ID; 18506 18507 /** 18508 * Flags related to accessibility processing. 18509 * 18510 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 18511 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 18512 */ 18513 int mAccessibilityFetchFlags; 18514 18515 /** 18516 * The drawable for highlighting accessibility focus. 18517 */ 18518 Drawable mAccessibilityFocusDrawable; 18519 18520 /** 18521 * Show where the margins, bounds and layout bounds are for each view. 18522 */ 18523 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 18524 18525 /** 18526 * Point used to compute visible regions. 18527 */ 18528 final Point mPoint = new Point(); 18529 18530 /** 18531 * Used to track which View originated a requestLayout() call, used when 18532 * requestLayout() is called during layout. 18533 */ 18534 View mViewRequestingLayout; 18535 18536 /** 18537 * Creates a new set of attachment information with the specified 18538 * events handler and thread. 18539 * 18540 * @param handler the events handler the view must use 18541 */ 18542 AttachInfo(IWindowSession session, IWindow window, Display display, 18543 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 18544 mSession = session; 18545 mWindow = window; 18546 mWindowToken = window.asBinder(); 18547 mDisplay = display; 18548 mViewRootImpl = viewRootImpl; 18549 mHandler = handler; 18550 mRootCallbacks = effectPlayer; 18551 } 18552 } 18553 18554 /** 18555 * <p>ScrollabilityCache holds various fields used by a View when scrolling 18556 * is supported. This avoids keeping too many unused fields in most 18557 * instances of View.</p> 18558 */ 18559 private static class ScrollabilityCache implements Runnable { 18560 18561 /** 18562 * Scrollbars are not visible 18563 */ 18564 public static final int OFF = 0; 18565 18566 /** 18567 * Scrollbars are visible 18568 */ 18569 public static final int ON = 1; 18570 18571 /** 18572 * Scrollbars are fading away 18573 */ 18574 public static final int FADING = 2; 18575 18576 public boolean fadeScrollBars; 18577 18578 public int fadingEdgeLength; 18579 public int scrollBarDefaultDelayBeforeFade; 18580 public int scrollBarFadeDuration; 18581 18582 public int scrollBarSize; 18583 public ScrollBarDrawable scrollBar; 18584 public float[] interpolatorValues; 18585 public View host; 18586 18587 public final Paint paint; 18588 public final Matrix matrix; 18589 public Shader shader; 18590 18591 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 18592 18593 private static final float[] OPAQUE = { 255 }; 18594 private static final float[] TRANSPARENT = { 0.0f }; 18595 18596 /** 18597 * When fading should start. This time moves into the future every time 18598 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 18599 */ 18600 public long fadeStartTime; 18601 18602 18603 /** 18604 * The current state of the scrollbars: ON, OFF, or FADING 18605 */ 18606 public int state = OFF; 18607 18608 private int mLastColor; 18609 18610 public ScrollabilityCache(ViewConfiguration configuration, View host) { 18611 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 18612 scrollBarSize = configuration.getScaledScrollBarSize(); 18613 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 18614 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 18615 18616 paint = new Paint(); 18617 matrix = new Matrix(); 18618 // use use a height of 1, and then wack the matrix each time we 18619 // actually use it. 18620 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18621 paint.setShader(shader); 18622 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18623 18624 this.host = host; 18625 } 18626 18627 public void setFadeColor(int color) { 18628 if (color != mLastColor) { 18629 mLastColor = color; 18630 18631 if (color != 0) { 18632 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 18633 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 18634 paint.setShader(shader); 18635 // Restore the default transfer mode (src_over) 18636 paint.setXfermode(null); 18637 } else { 18638 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18639 paint.setShader(shader); 18640 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18641 } 18642 } 18643 } 18644 18645 public void run() { 18646 long now = AnimationUtils.currentAnimationTimeMillis(); 18647 if (now >= fadeStartTime) { 18648 18649 // the animation fades the scrollbars out by changing 18650 // the opacity (alpha) from fully opaque to fully 18651 // transparent 18652 int nextFrame = (int) now; 18653 int framesCount = 0; 18654 18655 Interpolator interpolator = scrollBarInterpolator; 18656 18657 // Start opaque 18658 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 18659 18660 // End transparent 18661 nextFrame += scrollBarFadeDuration; 18662 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 18663 18664 state = FADING; 18665 18666 // Kick off the fade animation 18667 host.invalidate(true); 18668 } 18669 } 18670 } 18671 18672 /** 18673 * Resuable callback for sending 18674 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 18675 */ 18676 private class SendViewScrolledAccessibilityEvent implements Runnable { 18677 public volatile boolean mIsPending; 18678 18679 public void run() { 18680 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 18681 mIsPending = false; 18682 } 18683 } 18684 18685 /** 18686 * <p> 18687 * This class represents a delegate that can be registered in a {@link View} 18688 * to enhance accessibility support via composition rather via inheritance. 18689 * It is specifically targeted to widget developers that extend basic View 18690 * classes i.e. classes in package android.view, that would like their 18691 * applications to be backwards compatible. 18692 * </p> 18693 * <div class="special reference"> 18694 * <h3>Developer Guides</h3> 18695 * <p>For more information about making applications accessible, read the 18696 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 18697 * developer guide.</p> 18698 * </div> 18699 * <p> 18700 * A scenario in which a developer would like to use an accessibility delegate 18701 * is overriding a method introduced in a later API version then the minimal API 18702 * version supported by the application. For example, the method 18703 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 18704 * in API version 4 when the accessibility APIs were first introduced. If a 18705 * developer would like his application to run on API version 4 devices (assuming 18706 * all other APIs used by the application are version 4 or lower) and take advantage 18707 * of this method, instead of overriding the method which would break the application's 18708 * backwards compatibility, he can override the corresponding method in this 18709 * delegate and register the delegate in the target View if the API version of 18710 * the system is high enough i.e. the API version is same or higher to the API 18711 * version that introduced 18712 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 18713 * </p> 18714 * <p> 18715 * Here is an example implementation: 18716 * </p> 18717 * <code><pre><p> 18718 * if (Build.VERSION.SDK_INT >= 14) { 18719 * // If the API version is equal of higher than the version in 18720 * // which onInitializeAccessibilityNodeInfo was introduced we 18721 * // register a delegate with a customized implementation. 18722 * View view = findViewById(R.id.view_id); 18723 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 18724 * public void onInitializeAccessibilityNodeInfo(View host, 18725 * AccessibilityNodeInfo info) { 18726 * // Let the default implementation populate the info. 18727 * super.onInitializeAccessibilityNodeInfo(host, info); 18728 * // Set some other information. 18729 * info.setEnabled(host.isEnabled()); 18730 * } 18731 * }); 18732 * } 18733 * </code></pre></p> 18734 * <p> 18735 * This delegate contains methods that correspond to the accessibility methods 18736 * in View. If a delegate has been specified the implementation in View hands 18737 * off handling to the corresponding method in this delegate. The default 18738 * implementation the delegate methods behaves exactly as the corresponding 18739 * method in View for the case of no accessibility delegate been set. Hence, 18740 * to customize the behavior of a View method, clients can override only the 18741 * corresponding delegate method without altering the behavior of the rest 18742 * accessibility related methods of the host view. 18743 * </p> 18744 */ 18745 public static class AccessibilityDelegate { 18746 18747 /** 18748 * Sends an accessibility event of the given type. If accessibility is not 18749 * enabled this method has no effect. 18750 * <p> 18751 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 18752 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 18753 * been set. 18754 * </p> 18755 * 18756 * @param host The View hosting the delegate. 18757 * @param eventType The type of the event to send. 18758 * 18759 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 18760 */ 18761 public void sendAccessibilityEvent(View host, int eventType) { 18762 host.sendAccessibilityEventInternal(eventType); 18763 } 18764 18765 /** 18766 * Performs the specified accessibility action on the view. For 18767 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 18768 * <p> 18769 * The default implementation behaves as 18770 * {@link View#performAccessibilityAction(int, Bundle) 18771 * View#performAccessibilityAction(int, Bundle)} for the case of 18772 * no accessibility delegate been set. 18773 * </p> 18774 * 18775 * @param action The action to perform. 18776 * @return Whether the action was performed. 18777 * 18778 * @see View#performAccessibilityAction(int, Bundle) 18779 * View#performAccessibilityAction(int, Bundle) 18780 */ 18781 public boolean performAccessibilityAction(View host, int action, Bundle args) { 18782 return host.performAccessibilityActionInternal(action, args); 18783 } 18784 18785 /** 18786 * Sends an accessibility event. This method behaves exactly as 18787 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 18788 * empty {@link AccessibilityEvent} and does not perform a check whether 18789 * accessibility is enabled. 18790 * <p> 18791 * The default implementation behaves as 18792 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18793 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 18794 * the case of no accessibility delegate been set. 18795 * </p> 18796 * 18797 * @param host The View hosting the delegate. 18798 * @param event The event to send. 18799 * 18800 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18801 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18802 */ 18803 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 18804 host.sendAccessibilityEventUncheckedInternal(event); 18805 } 18806 18807 /** 18808 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 18809 * to its children for adding their text content to the event. 18810 * <p> 18811 * The default implementation behaves as 18812 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18813 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 18814 * the case of no accessibility delegate been set. 18815 * </p> 18816 * 18817 * @param host The View hosting the delegate. 18818 * @param event The event. 18819 * @return True if the event population was completed. 18820 * 18821 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18822 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18823 */ 18824 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18825 return host.dispatchPopulateAccessibilityEventInternal(event); 18826 } 18827 18828 /** 18829 * Gives a chance to the host View to populate the accessibility event with its 18830 * text content. 18831 * <p> 18832 * The default implementation behaves as 18833 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 18834 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 18835 * the case of no accessibility delegate been set. 18836 * </p> 18837 * 18838 * @param host The View hosting the delegate. 18839 * @param event The accessibility event which to populate. 18840 * 18841 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 18842 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 18843 */ 18844 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18845 host.onPopulateAccessibilityEventInternal(event); 18846 } 18847 18848 /** 18849 * Initializes an {@link AccessibilityEvent} with information about the 18850 * the host View which is the event source. 18851 * <p> 18852 * The default implementation behaves as 18853 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 18854 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 18855 * the case of no accessibility delegate been set. 18856 * </p> 18857 * 18858 * @param host The View hosting the delegate. 18859 * @param event The event to initialize. 18860 * 18861 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 18862 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 18863 */ 18864 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 18865 host.onInitializeAccessibilityEventInternal(event); 18866 } 18867 18868 /** 18869 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 18870 * <p> 18871 * The default implementation behaves as 18872 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18873 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 18874 * the case of no accessibility delegate been set. 18875 * </p> 18876 * 18877 * @param host The View hosting the delegate. 18878 * @param info The instance to initialize. 18879 * 18880 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18881 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18882 */ 18883 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 18884 host.onInitializeAccessibilityNodeInfoInternal(info); 18885 } 18886 18887 /** 18888 * Called when a child of the host View has requested sending an 18889 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 18890 * to augment the event. 18891 * <p> 18892 * The default implementation behaves as 18893 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18894 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 18895 * the case of no accessibility delegate been set. 18896 * </p> 18897 * 18898 * @param host The View hosting the delegate. 18899 * @param child The child which requests sending the event. 18900 * @param event The event to be sent. 18901 * @return True if the event should be sent 18902 * 18903 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18904 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18905 */ 18906 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 18907 AccessibilityEvent event) { 18908 return host.onRequestSendAccessibilityEventInternal(child, event); 18909 } 18910 18911 /** 18912 * Gets the provider for managing a virtual view hierarchy rooted at this View 18913 * and reported to {@link android.accessibilityservice.AccessibilityService}s 18914 * that explore the window content. 18915 * <p> 18916 * The default implementation behaves as 18917 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 18918 * the case of no accessibility delegate been set. 18919 * </p> 18920 * 18921 * @return The provider. 18922 * 18923 * @see AccessibilityNodeProvider 18924 */ 18925 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 18926 return null; 18927 } 18928 18929 /** 18930 * Returns an {@link AccessibilityNodeInfo} representing the host view from the 18931 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 18932 * This method is responsible for obtaining an accessibility node info from a 18933 * pool of reusable instances and calling 18934 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host 18935 * view to initialize the former. 18936 * <p> 18937 * <strong>Note:</strong> The client is responsible for recycling the obtained 18938 * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object 18939 * creation. 18940 * </p> 18941 * <p> 18942 * The default implementation behaves as 18943 * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for 18944 * the case of no accessibility delegate been set. 18945 * </p> 18946 * @return A populated {@link AccessibilityNodeInfo}. 18947 * 18948 * @see AccessibilityNodeInfo 18949 * 18950 * @hide 18951 */ 18952 public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { 18953 return host.createAccessibilityNodeInfoInternal(); 18954 } 18955 } 18956 18957 private class MatchIdPredicate implements Predicate<View> { 18958 public int mId; 18959 18960 @Override 18961 public boolean apply(View view) { 18962 return (view.mID == mId); 18963 } 18964 } 18965 18966 private class MatchLabelForPredicate implements Predicate<View> { 18967 private int mLabeledId; 18968 18969 @Override 18970 public boolean apply(View view) { 18971 return (view.mLabelForId == mLabeledId); 18972 } 18973 } 18974 18975 private class SendViewStateChangedAccessibilityEvent implements Runnable { 18976 private boolean mPosted; 18977 private long mLastEventTimeMillis; 18978 18979 public void run() { 18980 mPosted = false; 18981 mLastEventTimeMillis = SystemClock.uptimeMillis(); 18982 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 18983 AccessibilityEvent event = AccessibilityEvent.obtain(); 18984 event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED); 18985 event.setContentChangeType(AccessibilityEvent.CONTENT_CHANGE_TYPE_NODE); 18986 sendAccessibilityEventUnchecked(event); 18987 } 18988 } 18989 18990 public void runOrPost() { 18991 if (mPosted) { 18992 return; 18993 } 18994 final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis; 18995 final long minEventIntevalMillis = 18996 ViewConfiguration.getSendRecurringAccessibilityEventsInterval(); 18997 if (timeSinceLastMillis >= minEventIntevalMillis) { 18998 removeCallbacks(this); 18999 run(); 19000 } else { 19001 postDelayed(this, minEventIntevalMillis - timeSinceLastMillis); 19002 mPosted = true; 19003 } 19004 } 19005 } 19006 19007 /** 19008 * Dump all private flags in readable format, useful for documentation and 19009 * sanity checking. 19010 */ 19011 private static void dumpFlags() { 19012 final HashMap<String, String> found = Maps.newHashMap(); 19013 try { 19014 for (Field field : View.class.getDeclaredFields()) { 19015 final int modifiers = field.getModifiers(); 19016 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 19017 if (field.getType().equals(int.class)) { 19018 final int value = field.getInt(null); 19019 dumpFlag(found, field.getName(), value); 19020 } else if (field.getType().equals(int[].class)) { 19021 final int[] values = (int[]) field.get(null); 19022 for (int i = 0; i < values.length; i++) { 19023 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 19024 } 19025 } 19026 } 19027 } 19028 } catch (IllegalAccessException e) { 19029 throw new RuntimeException(e); 19030 } 19031 19032 final ArrayList<String> keys = Lists.newArrayList(); 19033 keys.addAll(found.keySet()); 19034 Collections.sort(keys); 19035 for (String key : keys) { 19036 Log.d(VIEW_LOG_TAG, found.get(key)); 19037 } 19038 } 19039 19040 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 19041 // Sort flags by prefix, then by bits, always keeping unique keys 19042 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 19043 final int prefix = name.indexOf('_'); 19044 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 19045 final String output = bits + " " + name; 19046 found.put(key, output); 19047 } 19048} 19049