View.java revision e3f23a36d86fedf6c8c6503378cd6d2190c5ab23
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.Build; 44import android.os.Bundle; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Parcel; 48import android.os.Parcelable; 49import android.os.RemoteException; 50import android.os.SystemClock; 51import android.os.SystemProperties; 52import android.text.TextUtils; 53import android.util.AttributeSet; 54import android.util.FloatProperty; 55import android.util.Log; 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.widget.ScrollBarDrawable; 77 78import static android.os.Build.VERSION_CODES.*; 79import static java.lang.Math.max; 80 81import com.android.internal.R; 82import com.android.internal.util.Predicate; 83import com.android.internal.view.menu.MenuBuilder; 84import com.google.android.collect.Lists; 85import com.google.android.collect.Maps; 86 87import java.lang.ref.WeakReference; 88import java.lang.reflect.Field; 89import java.lang.reflect.InvocationTargetException; 90import java.lang.reflect.Method; 91import java.lang.reflect.Modifier; 92import java.util.ArrayList; 93import java.util.Arrays; 94import java.util.Collections; 95import java.util.HashMap; 96import java.util.Locale; 97import java.util.concurrent.CopyOnWriteArrayList; 98import java.util.concurrent.atomic.AtomicInteger; 99 100/** 101 * <p> 102 * This class represents the basic building block for user interface components. A View 103 * occupies a rectangular area on the screen and is responsible for drawing and 104 * event handling. View is the base class for <em>widgets</em>, which are 105 * used to create interactive UI components (buttons, text fields, etc.). The 106 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 107 * are invisible containers that hold other Views (or other ViewGroups) and define 108 * their layout properties. 109 * </p> 110 * 111 * <div class="special reference"> 112 * <h3>Developer Guides</h3> 113 * <p>For information about using this class to develop your application's user interface, 114 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 115 * </div> 116 * 117 * <a name="Using"></a> 118 * <h3>Using Views</h3> 119 * <p> 120 * All of the views in a window are arranged in a single tree. You can add views 121 * either from code or by specifying a tree of views in one or more XML layout 122 * files. There are many specialized subclasses of views that act as controls or 123 * are capable of displaying text, images, or other content. 124 * </p> 125 * <p> 126 * Once you have created a tree of views, there are typically a few types of 127 * common operations you may wish to perform: 128 * <ul> 129 * <li><strong>Set properties:</strong> for example setting the text of a 130 * {@link android.widget.TextView}. The available properties and the methods 131 * that set them will vary among the different subclasses of views. Note that 132 * properties that are known at build time can be set in the XML layout 133 * files.</li> 134 * <li><strong>Set focus:</strong> The framework will handled moving focus in 135 * response to user input. To force focus to a specific view, call 136 * {@link #requestFocus}.</li> 137 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 138 * that will be notified when something interesting happens to the view. For 139 * example, all views will let you set a listener to be notified when the view 140 * gains or loses focus. You can register such a listener using 141 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 142 * Other view subclasses offer more specialized listeners. For example, a Button 143 * exposes a listener to notify clients when the button is clicked.</li> 144 * <li><strong>Set visibility:</strong> You can hide or show views using 145 * {@link #setVisibility(int)}.</li> 146 * </ul> 147 * </p> 148 * <p><em> 149 * Note: The Android framework is responsible for measuring, laying out and 150 * drawing views. You should not call methods that perform these actions on 151 * views yourself unless you are actually implementing a 152 * {@link android.view.ViewGroup}. 153 * </em></p> 154 * 155 * <a name="Lifecycle"></a> 156 * <h3>Implementing a Custom View</h3> 157 * 158 * <p> 159 * To implement a custom view, you will usually begin by providing overrides for 160 * some of the standard methods that the framework calls on all views. You do 161 * not need to override all of these methods. In fact, you can start by just 162 * overriding {@link #onDraw(android.graphics.Canvas)}. 163 * <table border="2" width="85%" align="center" cellpadding="5"> 164 * <thead> 165 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 166 * </thead> 167 * 168 * <tbody> 169 * <tr> 170 * <td rowspan="2">Creation</td> 171 * <td>Constructors</td> 172 * <td>There is a form of the constructor that are called when the view 173 * is created from code and a form that is called when the view is 174 * inflated from a layout file. The second form should parse and apply 175 * any attributes defined in the layout file. 176 * </td> 177 * </tr> 178 * <tr> 179 * <td><code>{@link #onFinishInflate()}</code></td> 180 * <td>Called after a view and all of its children has been inflated 181 * from XML.</td> 182 * </tr> 183 * 184 * <tr> 185 * <td rowspan="3">Layout</td> 186 * <td><code>{@link #onMeasure(int, int)}</code></td> 187 * <td>Called to determine the size requirements for this view and all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 193 * <td>Called when this view should assign a size and position to all 194 * of its children. 195 * </td> 196 * </tr> 197 * <tr> 198 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 199 * <td>Called when the size of this view has changed. 200 * </td> 201 * </tr> 202 * 203 * <tr> 204 * <td>Drawing</td> 205 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 206 * <td>Called when the view should render its content. 207 * </td> 208 * </tr> 209 * 210 * <tr> 211 * <td rowspan="4">Event processing</td> 212 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 213 * <td>Called when a new hardware key event occurs. 214 * </td> 215 * </tr> 216 * <tr> 217 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 218 * <td>Called when a hardware key up event occurs. 219 * </td> 220 * </tr> 221 * <tr> 222 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 223 * <td>Called when a trackball motion event occurs. 224 * </td> 225 * </tr> 226 * <tr> 227 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 228 * <td>Called when a touch screen motion event occurs. 229 * </td> 230 * </tr> 231 * 232 * <tr> 233 * <td rowspan="2">Focus</td> 234 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 235 * <td>Called when the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 241 * <td>Called when the window containing the view gains or loses focus. 242 * </td> 243 * </tr> 244 * 245 * <tr> 246 * <td rowspan="3">Attaching</td> 247 * <td><code>{@link #onAttachedToWindow()}</code></td> 248 * <td>Called when the view is attached to a window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onDetachedFromWindow}</code></td> 254 * <td>Called when the view is detached from its window. 255 * </td> 256 * </tr> 257 * 258 * <tr> 259 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 260 * <td>Called when the visibility of the window containing the view 261 * has changed. 262 * </td> 263 * </tr> 264 * </tbody> 265 * 266 * </table> 267 * </p> 268 * 269 * <a name="IDs"></a> 270 * <h3>IDs</h3> 271 * Views may have an integer id associated with them. These ids are typically 272 * assigned in the layout XML files, and are used to find specific views within 273 * the view tree. A common pattern is to: 274 * <ul> 275 * <li>Define a Button in the layout file and assign it a unique ID. 276 * <pre> 277 * <Button 278 * android:id="@+id/my_button" 279 * android:layout_width="wrap_content" 280 * android:layout_height="wrap_content" 281 * android:text="@string/my_button_text"/> 282 * </pre></li> 283 * <li>From the onCreate method of an Activity, find the Button 284 * <pre class="prettyprint"> 285 * Button myButton = (Button) findViewById(R.id.my_button); 286 * </pre></li> 287 * </ul> 288 * <p> 289 * View IDs need not be unique throughout the tree, but it is good practice to 290 * ensure that they are at least unique within the part of the tree you are 291 * searching. 292 * </p> 293 * 294 * <a name="Position"></a> 295 * <h3>Position</h3> 296 * <p> 297 * The geometry of a view is that of a rectangle. A view has a location, 298 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 299 * two dimensions, expressed as a width and a height. The unit for location 300 * and dimensions is the pixel. 301 * </p> 302 * 303 * <p> 304 * It is possible to retrieve the location of a view by invoking the methods 305 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 306 * coordinate of the rectangle representing the view. The latter returns the 307 * top, or Y, coordinate of the rectangle representing the view. These methods 308 * both return the location of the view relative to its parent. For instance, 309 * when getLeft() returns 20, that means the view is located 20 pixels to the 310 * right of the left edge of its direct parent. 311 * </p> 312 * 313 * <p> 314 * In addition, several convenience methods are offered to avoid unnecessary 315 * computations, namely {@link #getRight()} and {@link #getBottom()}. 316 * These methods return the coordinates of the right and bottom edges of the 317 * rectangle representing the view. For instance, calling {@link #getRight()} 318 * is similar to the following computation: <code>getLeft() + getWidth()</code> 319 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 320 * </p> 321 * 322 * <a name="SizePaddingMargins"></a> 323 * <h3>Size, padding and margins</h3> 324 * <p> 325 * The size of a view is expressed with a width and a height. A view actually 326 * possess two pairs of width and height values. 327 * </p> 328 * 329 * <p> 330 * The first pair is known as <em>measured width</em> and 331 * <em>measured height</em>. These dimensions define how big a view wants to be 332 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 333 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 334 * and {@link #getMeasuredHeight()}. 335 * </p> 336 * 337 * <p> 338 * The second pair is simply known as <em>width</em> and <em>height</em>, or 339 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 340 * dimensions define the actual size of the view on screen, at drawing time and 341 * after layout. These values may, but do not have to, be different from the 342 * measured width and height. The width and height can be obtained by calling 343 * {@link #getWidth()} and {@link #getHeight()}. 344 * </p> 345 * 346 * <p> 347 * To measure its dimensions, a view takes into account its padding. The padding 348 * is expressed in pixels for the left, top, right and bottom parts of the view. 349 * Padding can be used to offset the content of the view by a specific amount of 350 * pixels. For instance, a left padding of 2 will push the view's content by 351 * 2 pixels to the right of the left edge. Padding can be set using the 352 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 353 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 354 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 355 * {@link #getPaddingEnd()}. 356 * </p> 357 * 358 * <p> 359 * Even though a view can define a padding, it does not provide any support for 360 * margins. However, view groups provide such a support. Refer to 361 * {@link android.view.ViewGroup} and 362 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 363 * </p> 364 * 365 * <a name="Layout"></a> 366 * <h3>Layout</h3> 367 * <p> 368 * Layout is a two pass process: a measure pass and a layout pass. The measuring 369 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 370 * of the view tree. Each view pushes dimension specifications down the tree 371 * during the recursion. At the end of the measure pass, every view has stored 372 * its measurements. The second pass happens in 373 * {@link #layout(int,int,int,int)} and is also top-down. During 374 * this pass each parent is responsible for positioning all of its children 375 * using the sizes computed in the measure pass. 376 * </p> 377 * 378 * <p> 379 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 380 * {@link #getMeasuredHeight()} values must be set, along with those for all of 381 * that view's descendants. A view's measured width and measured height values 382 * must respect the constraints imposed by the view's parents. This guarantees 383 * that at the end of the measure pass, all parents accept all of their 384 * children's measurements. A parent view may call measure() more than once on 385 * its children. For example, the parent may measure each child once with 386 * unspecified dimensions to find out how big they want to be, then call 387 * measure() on them again with actual numbers if the sum of all the children's 388 * unconstrained sizes is too big or too small. 389 * </p> 390 * 391 * <p> 392 * The measure pass uses two classes to communicate dimensions. The 393 * {@link MeasureSpec} class is used by views to tell their parents how they 394 * want to be measured and positioned. The base LayoutParams class just 395 * describes how big the view wants to be for both width and height. For each 396 * dimension, it can specify one of: 397 * <ul> 398 * <li> an exact number 399 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 400 * (minus padding) 401 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 402 * enclose its content (plus padding). 403 * </ul> 404 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 405 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 406 * an X and Y value. 407 * </p> 408 * 409 * <p> 410 * MeasureSpecs are used to push requirements down the tree from parent to 411 * child. A MeasureSpec can be in one of three modes: 412 * <ul> 413 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 414 * of a child view. For example, a LinearLayout may call measure() on its child 415 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 416 * tall the child view wants to be given a width of 240 pixels. 417 * <li>EXACTLY: This is used by the parent to impose an exact size on the 418 * child. The child must use this size, and guarantee that all of its 419 * descendants will fit within this size. 420 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 421 * child. The child must gurantee that it and all of its descendants will fit 422 * within this size. 423 * </ul> 424 * </p> 425 * 426 * <p> 427 * To intiate a layout, call {@link #requestLayout}. This method is typically 428 * called by a view on itself when it believes that is can no longer fit within 429 * its current bounds. 430 * </p> 431 * 432 * <a name="Drawing"></a> 433 * <h3>Drawing</h3> 434 * <p> 435 * Drawing is handled by walking the tree and rendering each view that 436 * intersects the invalid region. Because the tree is traversed in-order, 437 * this means that parents will draw before (i.e., behind) their children, with 438 * siblings drawn in the order they appear in the tree. 439 * If you set a background drawable for a View, then the View will draw it for you 440 * before calling back to its <code>onDraw()</code> method. 441 * </p> 442 * 443 * <p> 444 * Note that the framework will not draw views that are not in the invalid region. 445 * </p> 446 * 447 * <p> 448 * To force a view to draw, call {@link #invalidate()}. 449 * </p> 450 * 451 * <a name="EventHandlingThreading"></a> 452 * <h3>Event Handling and Threading</h3> 453 * <p> 454 * The basic cycle of a view is as follows: 455 * <ol> 456 * <li>An event comes in and is dispatched to the appropriate view. The view 457 * handles the event and notifies any listeners.</li> 458 * <li>If in the course of processing the event, the view's bounds may need 459 * to be changed, the view will call {@link #requestLayout()}.</li> 460 * <li>Similarly, if in the course of processing the event the view's appearance 461 * may need to be changed, the view will call {@link #invalidate()}.</li> 462 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 463 * the framework will take care of measuring, laying out, and drawing the tree 464 * as appropriate.</li> 465 * </ol> 466 * </p> 467 * 468 * <p><em>Note: The entire view tree is single threaded. You must always be on 469 * the UI thread when calling any method on any view.</em> 470 * If you are doing work on other threads and want to update the state of a view 471 * from that thread, you should use a {@link Handler}. 472 * </p> 473 * 474 * <a name="FocusHandling"></a> 475 * <h3>Focus Handling</h3> 476 * <p> 477 * The framework will handle routine focus movement in response to user input. 478 * This includes changing the focus as views are removed or hidden, or as new 479 * views become available. Views indicate their willingness to take focus 480 * through the {@link #isFocusable} method. To change whether a view can take 481 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 482 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 483 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 484 * </p> 485 * <p> 486 * Focus movement is based on an algorithm which finds the nearest neighbor in a 487 * given direction. In rare cases, the default algorithm may not match the 488 * intended behavior of the developer. In these situations, you can provide 489 * explicit overrides by using these XML attributes in the layout file: 490 * <pre> 491 * nextFocusDown 492 * nextFocusLeft 493 * nextFocusRight 494 * nextFocusUp 495 * </pre> 496 * </p> 497 * 498 * 499 * <p> 500 * To get a particular view to take focus, call {@link #requestFocus()}. 501 * </p> 502 * 503 * <a name="TouchMode"></a> 504 * <h3>Touch Mode</h3> 505 * <p> 506 * When a user is navigating a user interface via directional keys such as a D-pad, it is 507 * necessary to give focus to actionable items such as buttons so the user can see 508 * what will take input. If the device has touch capabilities, however, and the user 509 * begins interacting with the interface by touching it, it is no longer necessary to 510 * always highlight, or give focus to, a particular view. This motivates a mode 511 * for interaction named 'touch mode'. 512 * </p> 513 * <p> 514 * For a touch capable device, once the user touches the screen, the device 515 * will enter touch mode. From this point onward, only views for which 516 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 517 * Other views that are touchable, like buttons, will not take focus when touched; they will 518 * only fire the on click listeners. 519 * </p> 520 * <p> 521 * Any time a user hits a directional key, such as a D-pad direction, the view device will 522 * exit touch mode, and find a view to take focus, so that the user may resume interacting 523 * with the user interface without touching the screen again. 524 * </p> 525 * <p> 526 * The touch mode state is maintained across {@link android.app.Activity}s. Call 527 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 528 * </p> 529 * 530 * <a name="Scrolling"></a> 531 * <h3>Scrolling</h3> 532 * <p> 533 * The framework provides basic support for views that wish to internally 534 * scroll their content. This includes keeping track of the X and Y scroll 535 * offset as well as mechanisms for drawing scrollbars. See 536 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 537 * {@link #awakenScrollBars()} for more details. 538 * </p> 539 * 540 * <a name="Tags"></a> 541 * <h3>Tags</h3> 542 * <p> 543 * Unlike IDs, tags are not used to identify views. Tags are essentially an 544 * extra piece of information that can be associated with a view. They are most 545 * often used as a convenience to store data related to views in the views 546 * themselves rather than by putting them in a separate structure. 547 * </p> 548 * 549 * <a name="Properties"></a> 550 * <h3>Properties</h3> 551 * <p> 552 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 553 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 554 * available both in the {@link Property} form as well as in similarly-named setter/getter 555 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 556 * be used to set persistent state associated with these rendering-related properties on the view. 557 * The properties and methods can also be used in conjunction with 558 * {@link android.animation.Animator Animator}-based animations, described more in the 559 * <a href="#Animation">Animation</a> section. 560 * </p> 561 * 562 * <a name="Animation"></a> 563 * <h3>Animation</h3> 564 * <p> 565 * Starting with Android 3.0, the preferred way of animating views is to use the 566 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 567 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 568 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 569 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 570 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 571 * makes animating these View properties particularly easy and efficient. 572 * </p> 573 * <p> 574 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 575 * You can attach an {@link Animation} object to a view using 576 * {@link #setAnimation(Animation)} or 577 * {@link #startAnimation(Animation)}. The animation can alter the scale, 578 * rotation, translation and alpha of a view over time. If the animation is 579 * attached to a view that has children, the animation will affect the entire 580 * subtree rooted by that node. When an animation is started, the framework will 581 * take care of redrawing the appropriate views until the animation completes. 582 * </p> 583 * 584 * <a name="Security"></a> 585 * <h3>Security</h3> 586 * <p> 587 * Sometimes it is essential that an application be able to verify that an action 588 * is being performed with the full knowledge and consent of the user, such as 589 * granting a permission request, making a purchase or clicking on an advertisement. 590 * Unfortunately, a malicious application could try to spoof the user into 591 * performing these actions, unaware, by concealing the intended purpose of the view. 592 * As a remedy, the framework offers a touch filtering mechanism that can be used to 593 * improve the security of views that provide access to sensitive functionality. 594 * </p><p> 595 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 596 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 597 * will discard touches that are received whenever the view's window is obscured by 598 * another visible window. As a result, the view will not receive touches whenever a 599 * toast, dialog or other window appears above the view's window. 600 * </p><p> 601 * For more fine-grained control over security, consider overriding the 602 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 603 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 604 * </p> 605 * 606 * @attr ref android.R.styleable#View_alpha 607 * @attr ref android.R.styleable#View_background 608 * @attr ref android.R.styleable#View_clickable 609 * @attr ref android.R.styleable#View_contentDescription 610 * @attr ref android.R.styleable#View_drawingCacheQuality 611 * @attr ref android.R.styleable#View_duplicateParentState 612 * @attr ref android.R.styleable#View_id 613 * @attr ref android.R.styleable#View_requiresFadingEdge 614 * @attr ref android.R.styleable#View_fadeScrollbars 615 * @attr ref android.R.styleable#View_fadingEdgeLength 616 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 617 * @attr ref android.R.styleable#View_fitsSystemWindows 618 * @attr ref android.R.styleable#View_isScrollContainer 619 * @attr ref android.R.styleable#View_focusable 620 * @attr ref android.R.styleable#View_focusableInTouchMode 621 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 622 * @attr ref android.R.styleable#View_keepScreenOn 623 * @attr ref android.R.styleable#View_layerType 624 * @attr ref android.R.styleable#View_layoutDirection 625 * @attr ref android.R.styleable#View_longClickable 626 * @attr ref android.R.styleable#View_minHeight 627 * @attr ref android.R.styleable#View_minWidth 628 * @attr ref android.R.styleable#View_nextFocusDown 629 * @attr ref android.R.styleable#View_nextFocusLeft 630 * @attr ref android.R.styleable#View_nextFocusRight 631 * @attr ref android.R.styleable#View_nextFocusUp 632 * @attr ref android.R.styleable#View_onClick 633 * @attr ref android.R.styleable#View_padding 634 * @attr ref android.R.styleable#View_paddingBottom 635 * @attr ref android.R.styleable#View_paddingLeft 636 * @attr ref android.R.styleable#View_paddingRight 637 * @attr ref android.R.styleable#View_paddingTop 638 * @attr ref android.R.styleable#View_paddingStart 639 * @attr ref android.R.styleable#View_paddingEnd 640 * @attr ref android.R.styleable#View_saveEnabled 641 * @attr ref android.R.styleable#View_rotation 642 * @attr ref android.R.styleable#View_rotationX 643 * @attr ref android.R.styleable#View_rotationY 644 * @attr ref android.R.styleable#View_scaleX 645 * @attr ref android.R.styleable#View_scaleY 646 * @attr ref android.R.styleable#View_scrollX 647 * @attr ref android.R.styleable#View_scrollY 648 * @attr ref android.R.styleable#View_scrollbarSize 649 * @attr ref android.R.styleable#View_scrollbarStyle 650 * @attr ref android.R.styleable#View_scrollbars 651 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 652 * @attr ref android.R.styleable#View_scrollbarFadeDuration 653 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 654 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 655 * @attr ref android.R.styleable#View_scrollbarThumbVertical 656 * @attr ref android.R.styleable#View_scrollbarTrackVertical 657 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 658 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 659 * @attr ref android.R.styleable#View_soundEffectsEnabled 660 * @attr ref android.R.styleable#View_tag 661 * @attr ref android.R.styleable#View_textAlignment 662 * @attr ref android.R.styleable#View_textDirection 663 * @attr ref android.R.styleable#View_transformPivotX 664 * @attr ref android.R.styleable#View_transformPivotY 665 * @attr ref android.R.styleable#View_translationX 666 * @attr ref android.R.styleable#View_translationY 667 * @attr ref android.R.styleable#View_visibility 668 * 669 * @see android.view.ViewGroup 670 */ 671public class View implements Drawable.Callback, KeyEvent.Callback, 672 AccessibilityEventSource { 673 private static final boolean DBG = false; 674 675 /** 676 * The logging tag used by this class with android.util.Log. 677 */ 678 protected static final String VIEW_LOG_TAG = "View"; 679 680 /** 681 * When set to true, apps will draw debugging information about their layouts. 682 * 683 * @hide 684 */ 685 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 686 687 /** 688 * Used to mark a View that has no ID. 689 */ 690 public static final int NO_ID = -1; 691 692 private static boolean sUseBrokenMakeMeasureSpec = false; 693 694 /** 695 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 696 * calling setFlags. 697 */ 698 private static final int NOT_FOCUSABLE = 0x00000000; 699 700 /** 701 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 702 * setFlags. 703 */ 704 private static final int FOCUSABLE = 0x00000001; 705 706 /** 707 * Mask for use with setFlags indicating bits used for focus. 708 */ 709 private static final int FOCUSABLE_MASK = 0x00000001; 710 711 /** 712 * This view will adjust its padding to fit sytem windows (e.g. status bar) 713 */ 714 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 715 716 /** 717 * This view is visible. 718 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 719 * android:visibility}. 720 */ 721 public static final int VISIBLE = 0x00000000; 722 723 /** 724 * This view is invisible, but it still takes up space for layout purposes. 725 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 726 * android:visibility}. 727 */ 728 public static final int INVISIBLE = 0x00000004; 729 730 /** 731 * This view is invisible, and it doesn't take any space for layout 732 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 733 * android:visibility}. 734 */ 735 public static final int GONE = 0x00000008; 736 737 /** 738 * Mask for use with setFlags indicating bits used for visibility. 739 * {@hide} 740 */ 741 static final int VISIBILITY_MASK = 0x0000000C; 742 743 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 744 745 /** 746 * This view is enabled. Interpretation varies by subclass. 747 * Use with ENABLED_MASK when calling setFlags. 748 * {@hide} 749 */ 750 static final int ENABLED = 0x00000000; 751 752 /** 753 * This view is disabled. Interpretation varies by subclass. 754 * Use with ENABLED_MASK when calling setFlags. 755 * {@hide} 756 */ 757 static final int DISABLED = 0x00000020; 758 759 /** 760 * Mask for use with setFlags indicating bits used for indicating whether 761 * this view is enabled 762 * {@hide} 763 */ 764 static final int ENABLED_MASK = 0x00000020; 765 766 /** 767 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 768 * called and further optimizations will be performed. It is okay to have 769 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 770 * {@hide} 771 */ 772 static final int WILL_NOT_DRAW = 0x00000080; 773 774 /** 775 * Mask for use with setFlags indicating bits used for indicating whether 776 * this view is will draw 777 * {@hide} 778 */ 779 static final int DRAW_MASK = 0x00000080; 780 781 /** 782 * <p>This view doesn't show scrollbars.</p> 783 * {@hide} 784 */ 785 static final int SCROLLBARS_NONE = 0x00000000; 786 787 /** 788 * <p>This view shows horizontal scrollbars.</p> 789 * {@hide} 790 */ 791 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 792 793 /** 794 * <p>This view shows vertical scrollbars.</p> 795 * {@hide} 796 */ 797 static final int SCROLLBARS_VERTICAL = 0x00000200; 798 799 /** 800 * <p>Mask for use with setFlags indicating bits used for indicating which 801 * scrollbars are enabled.</p> 802 * {@hide} 803 */ 804 static final int SCROLLBARS_MASK = 0x00000300; 805 806 /** 807 * Indicates that the view should filter touches when its window is obscured. 808 * Refer to the class comments for more information about this security feature. 809 * {@hide} 810 */ 811 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 812 813 /** 814 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 815 * that they are optional and should be skipped if the window has 816 * requested system UI flags that ignore those insets for layout. 817 */ 818 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 819 820 /** 821 * <p>This view doesn't show fading edges.</p> 822 * {@hide} 823 */ 824 static final int FADING_EDGE_NONE = 0x00000000; 825 826 /** 827 * <p>This view shows horizontal fading edges.</p> 828 * {@hide} 829 */ 830 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 831 832 /** 833 * <p>This view shows vertical fading edges.</p> 834 * {@hide} 835 */ 836 static final int FADING_EDGE_VERTICAL = 0x00002000; 837 838 /** 839 * <p>Mask for use with setFlags indicating bits used for indicating which 840 * fading edges are enabled.</p> 841 * {@hide} 842 */ 843 static final int FADING_EDGE_MASK = 0x00003000; 844 845 /** 846 * <p>Indicates this view can be clicked. When clickable, a View reacts 847 * to clicks by notifying the OnClickListener.<p> 848 * {@hide} 849 */ 850 static final int CLICKABLE = 0x00004000; 851 852 /** 853 * <p>Indicates this view is caching its drawing into a bitmap.</p> 854 * {@hide} 855 */ 856 static final int DRAWING_CACHE_ENABLED = 0x00008000; 857 858 /** 859 * <p>Indicates that no icicle should be saved for this view.<p> 860 * {@hide} 861 */ 862 static final int SAVE_DISABLED = 0x000010000; 863 864 /** 865 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 866 * property.</p> 867 * {@hide} 868 */ 869 static final int SAVE_DISABLED_MASK = 0x000010000; 870 871 /** 872 * <p>Indicates that no drawing cache should ever be created for this view.<p> 873 * {@hide} 874 */ 875 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 876 877 /** 878 * <p>Indicates this view can take / keep focus when int touch mode.</p> 879 * {@hide} 880 */ 881 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 882 883 /** 884 * <p>Enables low quality mode for the drawing cache.</p> 885 */ 886 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 887 888 /** 889 * <p>Enables high quality mode for the drawing cache.</p> 890 */ 891 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 892 893 /** 894 * <p>Enables automatic quality mode for the drawing cache.</p> 895 */ 896 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 897 898 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 899 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 900 }; 901 902 /** 903 * <p>Mask for use with setFlags indicating bits used for the cache 904 * quality property.</p> 905 * {@hide} 906 */ 907 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 908 909 /** 910 * <p> 911 * Indicates this view can be long clicked. When long clickable, a View 912 * reacts to long clicks by notifying the OnLongClickListener or showing a 913 * context menu. 914 * </p> 915 * {@hide} 916 */ 917 static final int LONG_CLICKABLE = 0x00200000; 918 919 /** 920 * <p>Indicates that this view gets its drawable states from its direct parent 921 * and ignores its original internal states.</p> 922 * 923 * @hide 924 */ 925 static final int DUPLICATE_PARENT_STATE = 0x00400000; 926 927 /** 928 * The scrollbar style to display the scrollbars inside the content area, 929 * without increasing the padding. The scrollbars will be overlaid with 930 * translucency on the view's content. 931 */ 932 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 933 934 /** 935 * The scrollbar style to display the scrollbars inside the padded area, 936 * increasing the padding of the view. The scrollbars will not overlap the 937 * content area of the view. 938 */ 939 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 940 941 /** 942 * The scrollbar style to display the scrollbars at the edge of the view, 943 * without increasing the padding. The scrollbars will be overlaid with 944 * translucency. 945 */ 946 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 947 948 /** 949 * The scrollbar style to display the scrollbars at the edge of the view, 950 * increasing the padding of the view. The scrollbars will only overlap the 951 * background, if any. 952 */ 953 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 954 955 /** 956 * Mask to check if the scrollbar style is overlay or inset. 957 * {@hide} 958 */ 959 static final int SCROLLBARS_INSET_MASK = 0x01000000; 960 961 /** 962 * Mask to check if the scrollbar style is inside or outside. 963 * {@hide} 964 */ 965 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 966 967 /** 968 * Mask for scrollbar style. 969 * {@hide} 970 */ 971 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 972 973 /** 974 * View flag indicating that the screen should remain on while the 975 * window containing this view is visible to the user. This effectively 976 * takes care of automatically setting the WindowManager's 977 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 978 */ 979 public static final int KEEP_SCREEN_ON = 0x04000000; 980 981 /** 982 * View flag indicating whether this view should have sound effects enabled 983 * for events such as clicking and touching. 984 */ 985 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 986 987 /** 988 * View flag indicating whether this view should have haptic feedback 989 * enabled for events such as long presses. 990 */ 991 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 992 993 /** 994 * <p>Indicates that the view hierarchy should stop saving state when 995 * it reaches this view. If state saving is initiated immediately at 996 * the view, it will be allowed. 997 * {@hide} 998 */ 999 static final int PARENT_SAVE_DISABLED = 0x20000000; 1000 1001 /** 1002 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1003 * {@hide} 1004 */ 1005 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1006 1007 /** 1008 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1009 * should add all focusable Views regardless if they are focusable in touch mode. 1010 */ 1011 public static final int FOCUSABLES_ALL = 0x00000000; 1012 1013 /** 1014 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1015 * should add only Views focusable in touch mode. 1016 */ 1017 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1018 1019 /** 1020 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1021 * item. 1022 */ 1023 public static final int FOCUS_BACKWARD = 0x00000001; 1024 1025 /** 1026 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1027 * item. 1028 */ 1029 public static final int FOCUS_FORWARD = 0x00000002; 1030 1031 /** 1032 * Use with {@link #focusSearch(int)}. Move focus to the left. 1033 */ 1034 public static final int FOCUS_LEFT = 0x00000011; 1035 1036 /** 1037 * Use with {@link #focusSearch(int)}. Move focus up. 1038 */ 1039 public static final int FOCUS_UP = 0x00000021; 1040 1041 /** 1042 * Use with {@link #focusSearch(int)}. Move focus to the right. 1043 */ 1044 public static final int FOCUS_RIGHT = 0x00000042; 1045 1046 /** 1047 * Use with {@link #focusSearch(int)}. Move focus down. 1048 */ 1049 public static final int FOCUS_DOWN = 0x00000082; 1050 1051 /** 1052 * Bits of {@link #getMeasuredWidthAndState()} and 1053 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1054 */ 1055 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1056 1057 /** 1058 * Bits of {@link #getMeasuredWidthAndState()} and 1059 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1060 */ 1061 public static final int MEASURED_STATE_MASK = 0xff000000; 1062 1063 /** 1064 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1065 * for functions that combine both width and height into a single int, 1066 * such as {@link #getMeasuredState()} and the childState argument of 1067 * {@link #resolveSizeAndState(int, int, int)}. 1068 */ 1069 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1070 1071 /** 1072 * Bit of {@link #getMeasuredWidthAndState()} and 1073 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1074 * is smaller that the space the view would like to have. 1075 */ 1076 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1077 1078 /** 1079 * Base View state sets 1080 */ 1081 // Singles 1082 /** 1083 * Indicates the view has no states set. States are used with 1084 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1085 * view depending on its state. 1086 * 1087 * @see android.graphics.drawable.Drawable 1088 * @see #getDrawableState() 1089 */ 1090 protected static final int[] EMPTY_STATE_SET; 1091 /** 1092 * Indicates the view is enabled. States are used with 1093 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1094 * view depending on its state. 1095 * 1096 * @see android.graphics.drawable.Drawable 1097 * @see #getDrawableState() 1098 */ 1099 protected static final int[] ENABLED_STATE_SET; 1100 /** 1101 * Indicates the view is focused. States are used with 1102 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1103 * view depending on its state. 1104 * 1105 * @see android.graphics.drawable.Drawable 1106 * @see #getDrawableState() 1107 */ 1108 protected static final int[] FOCUSED_STATE_SET; 1109 /** 1110 * Indicates the view is selected. States are used with 1111 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1112 * view depending on its state. 1113 * 1114 * @see android.graphics.drawable.Drawable 1115 * @see #getDrawableState() 1116 */ 1117 protected static final int[] SELECTED_STATE_SET; 1118 /** 1119 * Indicates the view is pressed. States are used with 1120 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1121 * view depending on its state. 1122 * 1123 * @see android.graphics.drawable.Drawable 1124 * @see #getDrawableState() 1125 * @hide 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 /** 1567 * The view's tag. 1568 * {@hide} 1569 * 1570 * @see #setTag(Object) 1571 * @see #getTag() 1572 */ 1573 protected Object mTag; 1574 1575 // for mPrivateFlags: 1576 /** {@hide} */ 1577 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1578 /** {@hide} */ 1579 static final int PFLAG_FOCUSED = 0x00000002; 1580 /** {@hide} */ 1581 static final int PFLAG_SELECTED = 0x00000004; 1582 /** {@hide} */ 1583 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1584 /** {@hide} */ 1585 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1586 /** {@hide} */ 1587 static final int PFLAG_DRAWN = 0x00000020; 1588 /** 1589 * When this flag is set, this view is running an animation on behalf of its 1590 * children and should therefore not cancel invalidate requests, even if they 1591 * lie outside of this view's bounds. 1592 * 1593 * {@hide} 1594 */ 1595 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1596 /** {@hide} */ 1597 static final int PFLAG_SKIP_DRAW = 0x00000080; 1598 /** {@hide} */ 1599 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1600 /** {@hide} */ 1601 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1602 /** {@hide} */ 1603 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1604 /** {@hide} */ 1605 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1606 /** {@hide} */ 1607 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1608 /** {@hide} */ 1609 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1610 1611 private static final int PFLAG_PRESSED = 0x00004000; 1612 1613 /** {@hide} */ 1614 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1615 /** 1616 * Flag used to indicate that this view should be drawn once more (and only once 1617 * more) after its animation has completed. 1618 * {@hide} 1619 */ 1620 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1621 1622 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1623 1624 /** 1625 * Indicates that the View returned true when onSetAlpha() was called and that 1626 * the alpha must be restored. 1627 * {@hide} 1628 */ 1629 static final int PFLAG_ALPHA_SET = 0x00040000; 1630 1631 /** 1632 * Set by {@link #setScrollContainer(boolean)}. 1633 */ 1634 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1635 1636 /** 1637 * Set by {@link #setScrollContainer(boolean)}. 1638 */ 1639 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1640 1641 /** 1642 * View flag indicating whether this view was invalidated (fully or partially.) 1643 * 1644 * @hide 1645 */ 1646 static final int PFLAG_DIRTY = 0x00200000; 1647 1648 /** 1649 * View flag indicating whether this view was invalidated by an opaque 1650 * invalidate request. 1651 * 1652 * @hide 1653 */ 1654 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1655 1656 /** 1657 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1658 * 1659 * @hide 1660 */ 1661 static final int PFLAG_DIRTY_MASK = 0x00600000; 1662 1663 /** 1664 * Indicates whether the background is opaque. 1665 * 1666 * @hide 1667 */ 1668 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1669 1670 /** 1671 * Indicates whether the scrollbars are opaque. 1672 * 1673 * @hide 1674 */ 1675 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1676 1677 /** 1678 * Indicates whether the view is opaque. 1679 * 1680 * @hide 1681 */ 1682 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1683 1684 /** 1685 * Indicates a prepressed state; 1686 * the short time between ACTION_DOWN and recognizing 1687 * a 'real' press. Prepressed is used to recognize quick taps 1688 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1689 * 1690 * @hide 1691 */ 1692 private static final int PFLAG_PREPRESSED = 0x02000000; 1693 1694 /** 1695 * Indicates whether the view is temporarily detached. 1696 * 1697 * @hide 1698 */ 1699 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1700 1701 /** 1702 * Indicates that we should awaken scroll bars once attached 1703 * 1704 * @hide 1705 */ 1706 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1707 1708 /** 1709 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1710 * @hide 1711 */ 1712 private static final int PFLAG_HOVERED = 0x10000000; 1713 1714 /** 1715 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1716 * for transform operations 1717 * 1718 * @hide 1719 */ 1720 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1721 1722 /** {@hide} */ 1723 static final int PFLAG_ACTIVATED = 0x40000000; 1724 1725 /** 1726 * Indicates that this view was specifically invalidated, not just dirtied because some 1727 * child view was invalidated. The flag is used to determine when we need to recreate 1728 * a view's display list (as opposed to just returning a reference to its existing 1729 * display list). 1730 * 1731 * @hide 1732 */ 1733 static final int PFLAG_INVALIDATED = 0x80000000; 1734 1735 /** 1736 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1737 * 1738 * -------|-------|-------|-------| 1739 * PFLAG2_TEXT_ALIGNMENT_FLAGS[0] 1740 * PFLAG2_TEXT_DIRECTION_FLAGS[0] 1741 * 1 PFLAG2_DRAG_CAN_ACCEPT 1742 * 1 PFLAG2_DRAG_HOVERED 1743 * 1 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT 1744 * 11 PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1745 * 1 1 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT 1746 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1747 * 11 1 PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 1748 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1749 * 1 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT 1750 * 1 1 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT 1751 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1752 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1753 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1754 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1755 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1756 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1757 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1758 * 111 PFLAG2_TEXT_DIRECTION_MASK 1759 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1760 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1761 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1762 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1763 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1764 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1765 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1766 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1767 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1768 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1769 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1770 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1771 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1772 * 11 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1773 * 1 PFLAG2_HAS_TRANSIENT_STATE 1774 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1775 * 1 PFLAG2_ACCESSIBILITY_STATE_CHANGED 1776 * 1 PFLAG2_VIEW_QUICK_REJECTED 1777 * 1 PFLAG2_PADDING_RESOLVED 1778 * -------|-------|-------|-------| 1779 */ 1780 1781 /** 1782 * Indicates that this view has reported that it can accept the current drag's content. 1783 * Cleared when the drag operation concludes. 1784 * @hide 1785 */ 1786 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1787 1788 /** 1789 * Indicates that this view is currently directly under the drag location in a 1790 * drag-and-drop operation involving content that it can accept. Cleared when 1791 * the drag exits the view, or when the drag operation concludes. 1792 * @hide 1793 */ 1794 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1795 1796 /** 1797 * Horizontal layout direction of this view is from Left to Right. 1798 * Use with {@link #setLayoutDirection}. 1799 */ 1800 public static final int LAYOUT_DIRECTION_LTR = 0; 1801 1802 /** 1803 * Horizontal layout direction of this view is from Right to Left. 1804 * Use with {@link #setLayoutDirection}. 1805 */ 1806 public static final int LAYOUT_DIRECTION_RTL = 1; 1807 1808 /** 1809 * Horizontal layout direction of this view is inherited from its parent. 1810 * Use with {@link #setLayoutDirection}. 1811 */ 1812 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1813 1814 /** 1815 * Horizontal layout direction of this view is from deduced from the default language 1816 * script for the locale. Use with {@link #setLayoutDirection}. 1817 */ 1818 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1819 1820 /** 1821 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1822 * @hide 1823 */ 1824 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1825 1826 /** 1827 * Mask for use with private flags indicating bits used for horizontal layout direction. 1828 * @hide 1829 */ 1830 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1831 1832 /** 1833 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1834 * right-to-left direction. 1835 * @hide 1836 */ 1837 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1838 1839 /** 1840 * Indicates whether the view horizontal layout direction has been resolved. 1841 * @hide 1842 */ 1843 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1844 1845 /** 1846 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1847 * @hide 1848 */ 1849 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1850 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1851 1852 /* 1853 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1854 * flag value. 1855 * @hide 1856 */ 1857 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1858 LAYOUT_DIRECTION_LTR, 1859 LAYOUT_DIRECTION_RTL, 1860 LAYOUT_DIRECTION_INHERIT, 1861 LAYOUT_DIRECTION_LOCALE 1862 }; 1863 1864 /** 1865 * Default horizontal layout direction. 1866 */ 1867 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1868 1869 /** 1870 * Default horizontal layout direction. 1871 * @hide 1872 */ 1873 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1874 1875 /** 1876 * Indicates that the view is tracking some sort of transient state 1877 * that the app should not need to be aware of, but that the framework 1878 * should take special care to preserve. 1879 * 1880 * @hide 1881 */ 1882 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x1 << 22; 1883 1884 /** 1885 * Text direction is inherited thru {@link ViewGroup} 1886 */ 1887 public static final int TEXT_DIRECTION_INHERIT = 0; 1888 1889 /** 1890 * Text direction is using "first strong algorithm". The first strong directional character 1891 * determines the paragraph direction. If there is no strong directional character, the 1892 * paragraph direction is the view's resolved layout direction. 1893 */ 1894 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1895 1896 /** 1897 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1898 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1899 * If there are neither, the paragraph direction is the view's resolved layout direction. 1900 */ 1901 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1902 1903 /** 1904 * Text direction is forced to LTR. 1905 */ 1906 public static final int TEXT_DIRECTION_LTR = 3; 1907 1908 /** 1909 * Text direction is forced to RTL. 1910 */ 1911 public static final int TEXT_DIRECTION_RTL = 4; 1912 1913 /** 1914 * Text direction is coming from the system Locale. 1915 */ 1916 public static final int TEXT_DIRECTION_LOCALE = 5; 1917 1918 /** 1919 * Default text direction is inherited 1920 */ 1921 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1922 1923 /** 1924 * Default resolved text direction 1925 * @hide 1926 */ 1927 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 1928 1929 /** 1930 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1931 * @hide 1932 */ 1933 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1934 1935 /** 1936 * Mask for use with private flags indicating bits used for text direction. 1937 * @hide 1938 */ 1939 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1940 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1941 1942 /** 1943 * Array of text direction flags for mapping attribute "textDirection" to correct 1944 * flag value. 1945 * @hide 1946 */ 1947 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1948 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1949 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1950 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1951 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1952 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1953 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1954 }; 1955 1956 /** 1957 * Indicates whether the view text direction has been resolved. 1958 * @hide 1959 */ 1960 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1961 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1962 1963 /** 1964 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1965 * @hide 1966 */ 1967 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1968 1969 /** 1970 * Mask for use with private flags indicating bits used for resolved text direction. 1971 * @hide 1972 */ 1973 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1974 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1975 1976 /** 1977 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1978 * @hide 1979 */ 1980 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1981 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1982 1983 /* 1984 * Default text alignment. The text alignment of this View is inherited from its parent. 1985 * Use with {@link #setTextAlignment(int)} 1986 */ 1987 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1988 1989 /** 1990 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1991 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1992 * 1993 * Use with {@link #setTextAlignment(int)} 1994 */ 1995 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1996 1997 /** 1998 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1999 * 2000 * Use with {@link #setTextAlignment(int)} 2001 */ 2002 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2003 2004 /** 2005 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2006 * 2007 * Use with {@link #setTextAlignment(int)} 2008 */ 2009 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2010 2011 /** 2012 * Center the paragraph, e.g. ALIGN_CENTER. 2013 * 2014 * Use with {@link #setTextAlignment(int)} 2015 */ 2016 public static final int TEXT_ALIGNMENT_CENTER = 4; 2017 2018 /** 2019 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2020 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2021 * 2022 * Use with {@link #setTextAlignment(int)} 2023 */ 2024 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2025 2026 /** 2027 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2028 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2029 * 2030 * Use with {@link #setTextAlignment(int)} 2031 */ 2032 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2033 2034 /** 2035 * Default text alignment is inherited 2036 */ 2037 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2038 2039 /** 2040 * Default resolved text alignment 2041 * @hide 2042 */ 2043 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2044 2045 /** 2046 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2047 * @hide 2048 */ 2049 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2050 2051 /** 2052 * Mask for use with private flags indicating bits used for text alignment. 2053 * @hide 2054 */ 2055 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2056 2057 /** 2058 * Array of text direction flags for mapping attribute "textAlignment" to correct 2059 * flag value. 2060 * @hide 2061 */ 2062 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2063 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2064 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2065 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2066 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2067 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2068 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2069 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2070 }; 2071 2072 /** 2073 * Indicates whether the view text alignment has been resolved. 2074 * @hide 2075 */ 2076 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2077 2078 /** 2079 * Bit shift to get the resolved text alignment. 2080 * @hide 2081 */ 2082 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2083 2084 /** 2085 * Mask for use with private flags indicating bits used for text alignment. 2086 * @hide 2087 */ 2088 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2089 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2090 2091 /** 2092 * Indicates whether if the view text alignment has been resolved to gravity 2093 */ 2094 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2095 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2096 2097 // Accessiblity constants for mPrivateFlags2 2098 2099 /** 2100 * Shift for the bits in {@link #mPrivateFlags2} related to the 2101 * "importantForAccessibility" attribute. 2102 */ 2103 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2104 2105 /** 2106 * Automatically determine whether a view is important for accessibility. 2107 */ 2108 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2109 2110 /** 2111 * The view is important for accessibility. 2112 */ 2113 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2114 2115 /** 2116 * The view is not important for accessibility. 2117 */ 2118 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2119 2120 /** 2121 * The default whether the view is important for accessibility. 2122 */ 2123 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2124 2125 /** 2126 * Mask for obtainig the bits which specify how to determine 2127 * whether a view is important for accessibility. 2128 */ 2129 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2130 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2131 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2132 2133 /** 2134 * Flag indicating whether a view has accessibility focus. 2135 */ 2136 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x00000040 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2137 2138 /** 2139 * Flag indicating whether a view state for accessibility has changed. 2140 */ 2141 static final int PFLAG2_ACCESSIBILITY_STATE_CHANGED = 0x00000080 2142 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2143 2144 /** 2145 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2146 * is used to check whether later changes to the view's transform should invalidate the 2147 * view to force the quickReject test to run again. 2148 */ 2149 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2150 2151 /** 2152 * Flag indicating that start/end padding has been resolved into left/right padding 2153 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2154 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2155 * during measurement. In some special cases this is required such as when an adapter-based 2156 * view measures prospective children without attaching them to a window. 2157 */ 2158 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2159 2160 /** 2161 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2162 */ 2163 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2164 2165 /** 2166 * Group of bits indicating that RTL properties resolution is done. 2167 */ 2168 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2169 PFLAG2_TEXT_DIRECTION_RESOLVED | 2170 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2171 PFLAG2_PADDING_RESOLVED | 2172 PFLAG2_DRAWABLE_RESOLVED; 2173 2174 // There are a couple of flags left in mPrivateFlags2 2175 2176 /* End of masks for mPrivateFlags2 */ 2177 2178 /* Masks for mPrivateFlags3 */ 2179 2180 /** 2181 * Flag indicating that view has a transform animation set on it. This is used to track whether 2182 * an animation is cleared between successive frames, in order to tell the associated 2183 * DisplayList to clear its animation matrix. 2184 */ 2185 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2186 2187 /** 2188 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2189 * animation is cleared between successive frames, in order to tell the associated 2190 * DisplayList to restore its alpha value. 2191 */ 2192 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2193 2194 2195 /* End of masks for mPrivateFlags3 */ 2196 2197 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2198 2199 /** 2200 * Always allow a user to over-scroll this view, provided it is a 2201 * view that can scroll. 2202 * 2203 * @see #getOverScrollMode() 2204 * @see #setOverScrollMode(int) 2205 */ 2206 public static final int OVER_SCROLL_ALWAYS = 0; 2207 2208 /** 2209 * Allow a user to over-scroll this view only if the content is large 2210 * enough to meaningfully scroll, provided it is a view that can scroll. 2211 * 2212 * @see #getOverScrollMode() 2213 * @see #setOverScrollMode(int) 2214 */ 2215 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2216 2217 /** 2218 * Never allow a user to over-scroll this view. 2219 * 2220 * @see #getOverScrollMode() 2221 * @see #setOverScrollMode(int) 2222 */ 2223 public static final int OVER_SCROLL_NEVER = 2; 2224 2225 /** 2226 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2227 * requested the system UI (status bar) to be visible (the default). 2228 * 2229 * @see #setSystemUiVisibility(int) 2230 */ 2231 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2232 2233 /** 2234 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2235 * system UI to enter an unobtrusive "low profile" mode. 2236 * 2237 * <p>This is for use in games, book readers, video players, or any other 2238 * "immersive" application where the usual system chrome is deemed too distracting. 2239 * 2240 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2241 * 2242 * @see #setSystemUiVisibility(int) 2243 */ 2244 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2245 2246 /** 2247 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2248 * system navigation be temporarily hidden. 2249 * 2250 * <p>This is an even less obtrusive state than that called for by 2251 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2252 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2253 * those to disappear. This is useful (in conjunction with the 2254 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2255 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2256 * window flags) for displaying content using every last pixel on the display. 2257 * 2258 * <p>There is a limitation: because navigation controls are so important, the least user 2259 * interaction will cause them to reappear immediately. When this happens, both 2260 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2261 * so that both elements reappear at the same time. 2262 * 2263 * @see #setSystemUiVisibility(int) 2264 */ 2265 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2266 2267 /** 2268 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2269 * into the normal fullscreen mode so that its content can take over the screen 2270 * while still allowing the user to interact with the application. 2271 * 2272 * <p>This has the same visual effect as 2273 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2274 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2275 * meaning that non-critical screen decorations (such as the status bar) will be 2276 * hidden while the user is in the View's window, focusing the experience on 2277 * that content. Unlike the window flag, if you are using ActionBar in 2278 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2279 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2280 * hide the action bar. 2281 * 2282 * <p>This approach to going fullscreen is best used over the window flag when 2283 * it is a transient state -- that is, the application does this at certain 2284 * points in its user interaction where it wants to allow the user to focus 2285 * on content, but not as a continuous state. For situations where the application 2286 * would like to simply stay full screen the entire time (such as a game that 2287 * wants to take over the screen), the 2288 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2289 * is usually a better approach. The state set here will be removed by the system 2290 * in various situations (such as the user moving to another application) like 2291 * the other system UI states. 2292 * 2293 * <p>When using this flag, the application should provide some easy facility 2294 * for the user to go out of it. A common example would be in an e-book 2295 * reader, where tapping on the screen brings back whatever screen and UI 2296 * decorations that had been hidden while the user was immersed in reading 2297 * the book. 2298 * 2299 * @see #setSystemUiVisibility(int) 2300 */ 2301 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2302 2303 /** 2304 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2305 * flags, we would like a stable view of the content insets given to 2306 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2307 * will always represent the worst case that the application can expect 2308 * as a continuous state. In the stock Android UI this is the space for 2309 * the system bar, nav bar, and status bar, but not more transient elements 2310 * such as an input method. 2311 * 2312 * The stable layout your UI sees is based on the system UI modes you can 2313 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2314 * then you will get a stable layout for changes of the 2315 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2316 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2317 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2318 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2319 * with a stable layout. (Note that you should avoid using 2320 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2321 * 2322 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2323 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2324 * then a hidden status bar will be considered a "stable" state for purposes 2325 * here. This allows your UI to continually hide the status bar, while still 2326 * using the system UI flags to hide the action bar while still retaining 2327 * a stable layout. Note that changing the window fullscreen flag will never 2328 * provide a stable layout for a clean transition. 2329 * 2330 * <p>If you are using ActionBar in 2331 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2332 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2333 * insets it adds to those given to the application. 2334 */ 2335 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2336 2337 /** 2338 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2339 * to be layed out as if it has requested 2340 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2341 * allows it to avoid artifacts when switching in and out of that mode, at 2342 * the expense that some of its user interface may be covered by screen 2343 * decorations when they are shown. You can perform layout of your inner 2344 * UI elements to account for the navagation system UI through the 2345 * {@link #fitSystemWindows(Rect)} method. 2346 */ 2347 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2348 2349 /** 2350 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2351 * to be layed out as if it has requested 2352 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2353 * allows it to avoid artifacts when switching in and out of that mode, at 2354 * the expense that some of its user interface may be covered by screen 2355 * decorations when they are shown. You can perform layout of your inner 2356 * UI elements to account for non-fullscreen system UI through the 2357 * {@link #fitSystemWindows(Rect)} method. 2358 */ 2359 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2360 2361 /** 2362 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2363 */ 2364 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2365 2366 /** 2367 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2368 */ 2369 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2370 2371 /** 2372 * @hide 2373 * 2374 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2375 * out of the public fields to keep the undefined bits out of the developer's way. 2376 * 2377 * Flag to make the status bar not expandable. Unless you also 2378 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2379 */ 2380 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2381 2382 /** 2383 * @hide 2384 * 2385 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2386 * out of the public fields to keep the undefined bits out of the developer's way. 2387 * 2388 * Flag to hide notification icons and scrolling ticker text. 2389 */ 2390 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2391 2392 /** 2393 * @hide 2394 * 2395 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2396 * out of the public fields to keep the undefined bits out of the developer's way. 2397 * 2398 * Flag to disable incoming notification alerts. This will not block 2399 * icons, but it will block sound, vibrating and other visual or aural notifications. 2400 */ 2401 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2402 2403 /** 2404 * @hide 2405 * 2406 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2407 * out of the public fields to keep the undefined bits out of the developer's way. 2408 * 2409 * Flag to hide only the scrolling ticker. Note that 2410 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2411 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2412 */ 2413 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2414 2415 /** 2416 * @hide 2417 * 2418 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2419 * out of the public fields to keep the undefined bits out of the developer's way. 2420 * 2421 * Flag to hide the center system info area. 2422 */ 2423 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2424 2425 /** 2426 * @hide 2427 * 2428 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2429 * out of the public fields to keep the undefined bits out of the developer's way. 2430 * 2431 * Flag to hide only the home button. Don't use this 2432 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2433 */ 2434 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2435 2436 /** 2437 * @hide 2438 * 2439 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2440 * out of the public fields to keep the undefined bits out of the developer's way. 2441 * 2442 * Flag to hide only the back button. Don't use this 2443 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2444 */ 2445 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2446 2447 /** 2448 * @hide 2449 * 2450 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2451 * out of the public fields to keep the undefined bits out of the developer's way. 2452 * 2453 * Flag to hide only the clock. You might use this if your activity has 2454 * its own clock making the status bar's clock redundant. 2455 */ 2456 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2457 2458 /** 2459 * @hide 2460 * 2461 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2462 * out of the public fields to keep the undefined bits out of the developer's way. 2463 * 2464 * Flag to hide only the recent apps button. Don't use this 2465 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2466 */ 2467 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2468 2469 /** 2470 * @hide 2471 * 2472 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2473 * out of the public fields to keep the undefined bits out of the developer's way. 2474 * 2475 * Flag to disable the global search gesture. Don't use this 2476 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2477 */ 2478 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2479 2480 /** 2481 * @hide 2482 */ 2483 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2484 2485 /** 2486 * These are the system UI flags that can be cleared by events outside 2487 * of an application. Currently this is just the ability to tap on the 2488 * screen while hiding the navigation bar to have it return. 2489 * @hide 2490 */ 2491 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2492 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2493 | SYSTEM_UI_FLAG_FULLSCREEN; 2494 2495 /** 2496 * Flags that can impact the layout in relation to system UI. 2497 */ 2498 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2499 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2500 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2501 2502 /** 2503 * Find views that render the specified text. 2504 * 2505 * @see #findViewsWithText(ArrayList, CharSequence, int) 2506 */ 2507 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2508 2509 /** 2510 * Find find views that contain the specified content description. 2511 * 2512 * @see #findViewsWithText(ArrayList, CharSequence, int) 2513 */ 2514 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2515 2516 /** 2517 * Find views that contain {@link AccessibilityNodeProvider}. Such 2518 * a View is a root of virtual view hierarchy and may contain the searched 2519 * text. If this flag is set Views with providers are automatically 2520 * added and it is a responsibility of the client to call the APIs of 2521 * the provider to determine whether the virtual tree rooted at this View 2522 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2523 * represeting the virtual views with this text. 2524 * 2525 * @see #findViewsWithText(ArrayList, CharSequence, int) 2526 * 2527 * @hide 2528 */ 2529 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2530 2531 /** 2532 * The undefined cursor position. 2533 * 2534 * @hide 2535 */ 2536 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2537 2538 /** 2539 * Indicates that the screen has changed state and is now off. 2540 * 2541 * @see #onScreenStateChanged(int) 2542 */ 2543 public static final int SCREEN_STATE_OFF = 0x0; 2544 2545 /** 2546 * Indicates that the screen has changed state and is now on. 2547 * 2548 * @see #onScreenStateChanged(int) 2549 */ 2550 public static final int SCREEN_STATE_ON = 0x1; 2551 2552 /** 2553 * Controls the over-scroll mode for this view. 2554 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2555 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2556 * and {@link #OVER_SCROLL_NEVER}. 2557 */ 2558 private int mOverScrollMode; 2559 2560 /** 2561 * The parent this view is attached to. 2562 * {@hide} 2563 * 2564 * @see #getParent() 2565 */ 2566 protected ViewParent mParent; 2567 2568 /** 2569 * {@hide} 2570 */ 2571 AttachInfo mAttachInfo; 2572 2573 /** 2574 * {@hide} 2575 */ 2576 @ViewDebug.ExportedProperty(flagMapping = { 2577 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2578 name = "FORCE_LAYOUT"), 2579 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2580 name = "LAYOUT_REQUIRED"), 2581 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2582 name = "DRAWING_CACHE_INVALID", outputIf = false), 2583 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2584 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2585 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2586 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2587 }) 2588 int mPrivateFlags; 2589 int mPrivateFlags2; 2590 int mPrivateFlags3; 2591 2592 /** 2593 * This view's request for the visibility of the status bar. 2594 * @hide 2595 */ 2596 @ViewDebug.ExportedProperty(flagMapping = { 2597 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2598 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2599 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2600 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2601 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2602 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2603 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2604 equals = SYSTEM_UI_FLAG_VISIBLE, 2605 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2606 }) 2607 int mSystemUiVisibility; 2608 2609 /** 2610 * Reference count for transient state. 2611 * @see #setHasTransientState(boolean) 2612 */ 2613 int mTransientStateCount = 0; 2614 2615 /** 2616 * Count of how many windows this view has been attached to. 2617 */ 2618 int mWindowAttachCount; 2619 2620 /** 2621 * The layout parameters associated with this view and used by the parent 2622 * {@link android.view.ViewGroup} to determine how this view should be 2623 * laid out. 2624 * {@hide} 2625 */ 2626 protected ViewGroup.LayoutParams mLayoutParams; 2627 2628 /** 2629 * The view flags hold various views states. 2630 * {@hide} 2631 */ 2632 @ViewDebug.ExportedProperty 2633 int mViewFlags; 2634 2635 static class TransformationInfo { 2636 /** 2637 * The transform matrix for the View. This transform is calculated internally 2638 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2639 * is used by default. Do *not* use this variable directly; instead call 2640 * getMatrix(), which will automatically recalculate the matrix if necessary 2641 * to get the correct matrix based on the latest rotation and scale properties. 2642 */ 2643 private final Matrix mMatrix = new Matrix(); 2644 2645 /** 2646 * The transform matrix for the View. This transform is calculated internally 2647 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2648 * is used by default. Do *not* use this variable directly; instead call 2649 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2650 * to get the correct matrix based on the latest rotation and scale properties. 2651 */ 2652 private Matrix mInverseMatrix; 2653 2654 /** 2655 * An internal variable that tracks whether we need to recalculate the 2656 * transform matrix, based on whether the rotation or scaleX/Y properties 2657 * have changed since the matrix was last calculated. 2658 */ 2659 boolean mMatrixDirty = false; 2660 2661 /** 2662 * An internal variable that tracks whether we need to recalculate the 2663 * transform matrix, based on whether the rotation or scaleX/Y properties 2664 * have changed since the matrix was last calculated. 2665 */ 2666 private boolean mInverseMatrixDirty = true; 2667 2668 /** 2669 * A variable that tracks whether we need to recalculate the 2670 * transform matrix, based on whether the rotation or scaleX/Y properties 2671 * have changed since the matrix was last calculated. This variable 2672 * is only valid after a call to updateMatrix() or to a function that 2673 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2674 */ 2675 private boolean mMatrixIsIdentity = true; 2676 2677 /** 2678 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2679 */ 2680 private Camera mCamera = null; 2681 2682 /** 2683 * This matrix is used when computing the matrix for 3D rotations. 2684 */ 2685 private Matrix matrix3D = null; 2686 2687 /** 2688 * These prev values are used to recalculate a centered pivot point when necessary. The 2689 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2690 * set), so thes values are only used then as well. 2691 */ 2692 private int mPrevWidth = -1; 2693 private int mPrevHeight = -1; 2694 2695 /** 2696 * The degrees rotation around the vertical axis through the pivot point. 2697 */ 2698 @ViewDebug.ExportedProperty 2699 float mRotationY = 0f; 2700 2701 /** 2702 * The degrees rotation around the horizontal axis through the pivot point. 2703 */ 2704 @ViewDebug.ExportedProperty 2705 float mRotationX = 0f; 2706 2707 /** 2708 * The degrees rotation around the pivot point. 2709 */ 2710 @ViewDebug.ExportedProperty 2711 float mRotation = 0f; 2712 2713 /** 2714 * The amount of translation of the object away from its left property (post-layout). 2715 */ 2716 @ViewDebug.ExportedProperty 2717 float mTranslationX = 0f; 2718 2719 /** 2720 * The amount of translation of the object away from its top property (post-layout). 2721 */ 2722 @ViewDebug.ExportedProperty 2723 float mTranslationY = 0f; 2724 2725 /** 2726 * The amount of scale in the x direction around the pivot point. A 2727 * value of 1 means no scaling is applied. 2728 */ 2729 @ViewDebug.ExportedProperty 2730 float mScaleX = 1f; 2731 2732 /** 2733 * The amount of scale in the y direction around the pivot point. A 2734 * value of 1 means no scaling is applied. 2735 */ 2736 @ViewDebug.ExportedProperty 2737 float mScaleY = 1f; 2738 2739 /** 2740 * The x location of the point around which the view is rotated and scaled. 2741 */ 2742 @ViewDebug.ExportedProperty 2743 float mPivotX = 0f; 2744 2745 /** 2746 * The y location of the point around which the view is rotated and scaled. 2747 */ 2748 @ViewDebug.ExportedProperty 2749 float mPivotY = 0f; 2750 2751 /** 2752 * The opacity of the View. This is a value from 0 to 1, where 0 means 2753 * completely transparent and 1 means completely opaque. 2754 */ 2755 @ViewDebug.ExportedProperty 2756 float mAlpha = 1f; 2757 } 2758 2759 TransformationInfo mTransformationInfo; 2760 2761 private boolean mLastIsOpaque; 2762 2763 /** 2764 * Convenience value to check for float values that are close enough to zero to be considered 2765 * zero. 2766 */ 2767 private static final float NONZERO_EPSILON = .001f; 2768 2769 /** 2770 * The distance in pixels from the left edge of this view's parent 2771 * to the left edge of this view. 2772 * {@hide} 2773 */ 2774 @ViewDebug.ExportedProperty(category = "layout") 2775 protected int mLeft; 2776 /** 2777 * The distance in pixels from the left edge of this view's parent 2778 * to the right edge of this view. 2779 * {@hide} 2780 */ 2781 @ViewDebug.ExportedProperty(category = "layout") 2782 protected int mRight; 2783 /** 2784 * The distance in pixels from the top edge of this view's parent 2785 * to the top edge of this view. 2786 * {@hide} 2787 */ 2788 @ViewDebug.ExportedProperty(category = "layout") 2789 protected int mTop; 2790 /** 2791 * The distance in pixels from the top edge of this view's parent 2792 * to the bottom edge of this view. 2793 * {@hide} 2794 */ 2795 @ViewDebug.ExportedProperty(category = "layout") 2796 protected int mBottom; 2797 2798 /** 2799 * The offset, in pixels, by which the content of this view is scrolled 2800 * horizontally. 2801 * {@hide} 2802 */ 2803 @ViewDebug.ExportedProperty(category = "scrolling") 2804 protected int mScrollX; 2805 /** 2806 * The offset, in pixels, by which the content of this view is scrolled 2807 * vertically. 2808 * {@hide} 2809 */ 2810 @ViewDebug.ExportedProperty(category = "scrolling") 2811 protected int mScrollY; 2812 2813 /** 2814 * The left padding in pixels, that is the distance in pixels between the 2815 * left edge of this view and the left edge of its content. 2816 * {@hide} 2817 */ 2818 @ViewDebug.ExportedProperty(category = "padding") 2819 protected int mPaddingLeft = 0; 2820 /** 2821 * The right padding in pixels, that is the distance in pixels between the 2822 * right edge of this view and the right edge of its content. 2823 * {@hide} 2824 */ 2825 @ViewDebug.ExportedProperty(category = "padding") 2826 protected int mPaddingRight = 0; 2827 /** 2828 * The top padding in pixels, that is the distance in pixels between the 2829 * top edge of this view and the top edge of its content. 2830 * {@hide} 2831 */ 2832 @ViewDebug.ExportedProperty(category = "padding") 2833 protected int mPaddingTop; 2834 /** 2835 * The bottom padding in pixels, that is the distance in pixels between the 2836 * bottom edge of this view and the bottom edge of its content. 2837 * {@hide} 2838 */ 2839 @ViewDebug.ExportedProperty(category = "padding") 2840 protected int mPaddingBottom; 2841 2842 /** 2843 * The layout insets in pixels, that is the distance in pixels between the 2844 * visible edges of this view its bounds. 2845 */ 2846 private Insets mLayoutInsets; 2847 2848 /** 2849 * Briefly describes the view and is primarily used for accessibility support. 2850 */ 2851 private CharSequence mContentDescription; 2852 2853 /** 2854 * Specifies the id of a view for which this view serves as a label for 2855 * accessibility purposes. 2856 */ 2857 private int mLabelForId = View.NO_ID; 2858 2859 /** 2860 * Predicate for matching labeled view id with its label for 2861 * accessibility purposes. 2862 */ 2863 private MatchLabelForPredicate mMatchLabelForPredicate; 2864 2865 /** 2866 * Predicate for matching a view by its id. 2867 */ 2868 private MatchIdPredicate mMatchIdPredicate; 2869 2870 /** 2871 * Cache the paddingRight set by the user to append to the scrollbar's size. 2872 * 2873 * @hide 2874 */ 2875 @ViewDebug.ExportedProperty(category = "padding") 2876 protected int mUserPaddingRight; 2877 2878 /** 2879 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2880 * 2881 * @hide 2882 */ 2883 @ViewDebug.ExportedProperty(category = "padding") 2884 protected int mUserPaddingBottom; 2885 2886 /** 2887 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2888 * 2889 * @hide 2890 */ 2891 @ViewDebug.ExportedProperty(category = "padding") 2892 protected int mUserPaddingLeft; 2893 2894 /** 2895 * Cache the paddingStart set by the user to append to the scrollbar's size. 2896 * 2897 */ 2898 @ViewDebug.ExportedProperty(category = "padding") 2899 int mUserPaddingStart; 2900 2901 /** 2902 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2903 * 2904 */ 2905 @ViewDebug.ExportedProperty(category = "padding") 2906 int mUserPaddingEnd; 2907 2908 /** 2909 * Cache initial left padding. 2910 * 2911 * @hide 2912 */ 2913 int mUserPaddingLeftInitial = 0; 2914 2915 /** 2916 * Cache initial right padding. 2917 * 2918 * @hide 2919 */ 2920 int mUserPaddingRightInitial = 0; 2921 2922 /** 2923 * Default undefined padding 2924 */ 2925 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 2926 2927 /** 2928 * @hide 2929 */ 2930 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2931 /** 2932 * @hide 2933 */ 2934 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2935 2936 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 2937 private Drawable mBackground; 2938 2939 private int mBackgroundResource; 2940 private boolean mBackgroundSizeChanged; 2941 2942 static class ListenerInfo { 2943 /** 2944 * Listener used to dispatch focus change events. 2945 * This field should be made private, so it is hidden from the SDK. 2946 * {@hide} 2947 */ 2948 protected OnFocusChangeListener mOnFocusChangeListener; 2949 2950 /** 2951 * Listeners for layout change events. 2952 */ 2953 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2954 2955 /** 2956 * Listeners for attach events. 2957 */ 2958 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2959 2960 /** 2961 * Listener used to dispatch click events. 2962 * This field should be made private, so it is hidden from the SDK. 2963 * {@hide} 2964 */ 2965 public OnClickListener mOnClickListener; 2966 2967 /** 2968 * Listener used to dispatch long click events. 2969 * This field should be made private, so it is hidden from the SDK. 2970 * {@hide} 2971 */ 2972 protected OnLongClickListener mOnLongClickListener; 2973 2974 /** 2975 * Listener used to build the context menu. 2976 * This field should be made private, so it is hidden from the SDK. 2977 * {@hide} 2978 */ 2979 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2980 2981 private OnKeyListener mOnKeyListener; 2982 2983 private OnTouchListener mOnTouchListener; 2984 2985 private OnHoverListener mOnHoverListener; 2986 2987 private OnGenericMotionListener mOnGenericMotionListener; 2988 2989 private OnDragListener mOnDragListener; 2990 2991 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2992 } 2993 2994 ListenerInfo mListenerInfo; 2995 2996 /** 2997 * The application environment this view lives in. 2998 * This field should be made private, so it is hidden from the SDK. 2999 * {@hide} 3000 */ 3001 protected Context mContext; 3002 3003 private final Resources mResources; 3004 3005 private ScrollabilityCache mScrollCache; 3006 3007 private int[] mDrawableState = null; 3008 3009 /** 3010 * Set to true when drawing cache is enabled and cannot be created. 3011 * 3012 * @hide 3013 */ 3014 public boolean mCachingFailed; 3015 3016 private Bitmap mDrawingCache; 3017 private Bitmap mUnscaledDrawingCache; 3018 private HardwareLayer mHardwareLayer; 3019 DisplayList mDisplayList; 3020 3021 /** 3022 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3023 * the user may specify which view to go to next. 3024 */ 3025 private int mNextFocusLeftId = View.NO_ID; 3026 3027 /** 3028 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3029 * the user may specify which view to go to next. 3030 */ 3031 private int mNextFocusRightId = View.NO_ID; 3032 3033 /** 3034 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3035 * the user may specify which view to go to next. 3036 */ 3037 private int mNextFocusUpId = View.NO_ID; 3038 3039 /** 3040 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3041 * the user may specify which view to go to next. 3042 */ 3043 private int mNextFocusDownId = View.NO_ID; 3044 3045 /** 3046 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3047 * the user may specify which view to go to next. 3048 */ 3049 int mNextFocusForwardId = View.NO_ID; 3050 3051 private CheckForLongPress mPendingCheckForLongPress; 3052 private CheckForTap mPendingCheckForTap = null; 3053 private PerformClick mPerformClick; 3054 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3055 3056 private UnsetPressedState mUnsetPressedState; 3057 3058 /** 3059 * Whether the long press's action has been invoked. The tap's action is invoked on the 3060 * up event while a long press is invoked as soon as the long press duration is reached, so 3061 * a long press could be performed before the tap is checked, in which case the tap's action 3062 * should not be invoked. 3063 */ 3064 private boolean mHasPerformedLongPress; 3065 3066 /** 3067 * The minimum height of the view. We'll try our best to have the height 3068 * of this view to at least this amount. 3069 */ 3070 @ViewDebug.ExportedProperty(category = "measurement") 3071 private int mMinHeight; 3072 3073 /** 3074 * The minimum width of the view. We'll try our best to have the width 3075 * of this view to at least this amount. 3076 */ 3077 @ViewDebug.ExportedProperty(category = "measurement") 3078 private int mMinWidth; 3079 3080 /** 3081 * The delegate to handle touch events that are physically in this view 3082 * but should be handled by another view. 3083 */ 3084 private TouchDelegate mTouchDelegate = null; 3085 3086 /** 3087 * Solid color to use as a background when creating the drawing cache. Enables 3088 * the cache to use 16 bit bitmaps instead of 32 bit. 3089 */ 3090 private int mDrawingCacheBackgroundColor = 0; 3091 3092 /** 3093 * Special tree observer used when mAttachInfo is null. 3094 */ 3095 private ViewTreeObserver mFloatingTreeObserver; 3096 3097 /** 3098 * Cache the touch slop from the context that created the view. 3099 */ 3100 private int mTouchSlop; 3101 3102 /** 3103 * Object that handles automatic animation of view properties. 3104 */ 3105 private ViewPropertyAnimator mAnimator = null; 3106 3107 /** 3108 * Flag indicating that a drag can cross window boundaries. When 3109 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3110 * with this flag set, all visible applications will be able to participate 3111 * in the drag operation and receive the dragged content. 3112 * 3113 * @hide 3114 */ 3115 public static final int DRAG_FLAG_GLOBAL = 1; 3116 3117 /** 3118 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3119 */ 3120 private float mVerticalScrollFactor; 3121 3122 /** 3123 * Position of the vertical scroll bar. 3124 */ 3125 private int mVerticalScrollbarPosition; 3126 3127 /** 3128 * Position the scroll bar at the default position as determined by the system. 3129 */ 3130 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3131 3132 /** 3133 * Position the scroll bar along the left edge. 3134 */ 3135 public static final int SCROLLBAR_POSITION_LEFT = 1; 3136 3137 /** 3138 * Position the scroll bar along the right edge. 3139 */ 3140 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3141 3142 /** 3143 * Indicates that the view does not have a layer. 3144 * 3145 * @see #getLayerType() 3146 * @see #setLayerType(int, android.graphics.Paint) 3147 * @see #LAYER_TYPE_SOFTWARE 3148 * @see #LAYER_TYPE_HARDWARE 3149 */ 3150 public static final int LAYER_TYPE_NONE = 0; 3151 3152 /** 3153 * <p>Indicates that the view has a software layer. A software layer is backed 3154 * by a bitmap and causes the view to be rendered using Android's software 3155 * rendering pipeline, even if hardware acceleration is enabled.</p> 3156 * 3157 * <p>Software layers have various usages:</p> 3158 * <p>When the application is not using hardware acceleration, a software layer 3159 * is useful to apply a specific color filter and/or blending mode and/or 3160 * translucency to a view and all its children.</p> 3161 * <p>When the application is using hardware acceleration, a software layer 3162 * is useful to render drawing primitives not supported by the hardware 3163 * accelerated pipeline. It can also be used to cache a complex view tree 3164 * into a texture and reduce the complexity of drawing operations. For instance, 3165 * when animating a complex view tree with a translation, a software layer can 3166 * be used to render the view tree only once.</p> 3167 * <p>Software layers should be avoided when the affected view tree updates 3168 * often. Every update will require to re-render the software layer, which can 3169 * potentially be slow (particularly when hardware acceleration is turned on 3170 * since the layer will have to be uploaded into a hardware texture after every 3171 * update.)</p> 3172 * 3173 * @see #getLayerType() 3174 * @see #setLayerType(int, android.graphics.Paint) 3175 * @see #LAYER_TYPE_NONE 3176 * @see #LAYER_TYPE_HARDWARE 3177 */ 3178 public static final int LAYER_TYPE_SOFTWARE = 1; 3179 3180 /** 3181 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3182 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3183 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3184 * rendering pipeline, but only if hardware acceleration is turned on for the 3185 * view hierarchy. When hardware acceleration is turned off, hardware layers 3186 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3187 * 3188 * <p>A hardware layer is useful to apply a specific color filter and/or 3189 * blending mode and/or translucency to a view and all its children.</p> 3190 * <p>A hardware layer can be used to cache a complex view tree into a 3191 * texture and reduce the complexity of drawing operations. For instance, 3192 * when animating a complex view tree with a translation, a hardware layer can 3193 * be used to render the view tree only once.</p> 3194 * <p>A hardware layer can also be used to increase the rendering quality when 3195 * rotation transformations are applied on a view. It can also be used to 3196 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3197 * 3198 * @see #getLayerType() 3199 * @see #setLayerType(int, android.graphics.Paint) 3200 * @see #LAYER_TYPE_NONE 3201 * @see #LAYER_TYPE_SOFTWARE 3202 */ 3203 public static final int LAYER_TYPE_HARDWARE = 2; 3204 3205 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3206 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3207 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3208 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3209 }) 3210 int mLayerType = LAYER_TYPE_NONE; 3211 Paint mLayerPaint; 3212 Rect mLocalDirtyRect; 3213 3214 /** 3215 * Set to true when the view is sending hover accessibility events because it 3216 * is the innermost hovered view. 3217 */ 3218 private boolean mSendingHoverAccessibilityEvents; 3219 3220 /** 3221 * Delegate for injecting accessibility functionality. 3222 */ 3223 AccessibilityDelegate mAccessibilityDelegate; 3224 3225 /** 3226 * Consistency verifier for debugging purposes. 3227 * @hide 3228 */ 3229 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3230 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3231 new InputEventConsistencyVerifier(this, 0) : null; 3232 3233 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3234 3235 /** 3236 * Simple constructor to use when creating a view from code. 3237 * 3238 * @param context The Context the view is running in, through which it can 3239 * access the current theme, resources, etc. 3240 */ 3241 public View(Context context) { 3242 mContext = context; 3243 mResources = context != null ? context.getResources() : null; 3244 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3245 // Set some flags defaults 3246 mPrivateFlags2 = 3247 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3248 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3249 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3250 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3251 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3252 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3253 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3254 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3255 mUserPaddingStart = UNDEFINED_PADDING; 3256 mUserPaddingEnd = UNDEFINED_PADDING; 3257 3258 if (!sUseBrokenMakeMeasureSpec && context.getApplicationInfo().targetSdkVersion <= 3259 Build.VERSION_CODES.JELLY_BEAN_MR1 ) { 3260 // Older apps may need this compatibility hack for measurement. 3261 sUseBrokenMakeMeasureSpec = true; 3262 } 3263 } 3264 3265 /** 3266 * Constructor that is called when inflating a view from XML. This is called 3267 * when a view is being constructed from an XML file, supplying attributes 3268 * that were specified in the XML file. This version uses a default style of 3269 * 0, so the only attribute values applied are those in the Context's Theme 3270 * and the given AttributeSet. 3271 * 3272 * <p> 3273 * The method onFinishInflate() will be called after all children have been 3274 * added. 3275 * 3276 * @param context The Context the view is running in, through which it can 3277 * access the current theme, resources, etc. 3278 * @param attrs The attributes of the XML tag that is inflating the view. 3279 * @see #View(Context, AttributeSet, int) 3280 */ 3281 public View(Context context, AttributeSet attrs) { 3282 this(context, attrs, 0); 3283 } 3284 3285 /** 3286 * Perform inflation from XML and apply a class-specific base style. This 3287 * constructor of View allows subclasses to use their own base style when 3288 * they are inflating. For example, a Button class's constructor would call 3289 * this version of the super class constructor and supply 3290 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3291 * the theme's button style to modify all of the base view attributes (in 3292 * particular its background) as well as the Button class's attributes. 3293 * 3294 * @param context The Context the view is running in, through which it can 3295 * access the current theme, resources, etc. 3296 * @param attrs The attributes of the XML tag that is inflating the view. 3297 * @param defStyle The default style to apply to this view. If 0, no style 3298 * will be applied (beyond what is included in the theme). This may 3299 * either be an attribute resource, whose value will be retrieved 3300 * from the current theme, or an explicit style resource. 3301 * @see #View(Context, AttributeSet) 3302 */ 3303 public View(Context context, AttributeSet attrs, int defStyle) { 3304 this(context); 3305 3306 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3307 defStyle, 0); 3308 3309 Drawable background = null; 3310 3311 int leftPadding = -1; 3312 int topPadding = -1; 3313 int rightPadding = -1; 3314 int bottomPadding = -1; 3315 int startPadding = UNDEFINED_PADDING; 3316 int endPadding = UNDEFINED_PADDING; 3317 3318 int padding = -1; 3319 3320 int viewFlagValues = 0; 3321 int viewFlagMasks = 0; 3322 3323 boolean setScrollContainer = false; 3324 3325 int x = 0; 3326 int y = 0; 3327 3328 float tx = 0; 3329 float ty = 0; 3330 float rotation = 0; 3331 float rotationX = 0; 3332 float rotationY = 0; 3333 float sx = 1f; 3334 float sy = 1f; 3335 boolean transformSet = false; 3336 3337 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3338 int overScrollMode = mOverScrollMode; 3339 boolean initializeScrollbars = false; 3340 3341 boolean leftPaddingDefined = false; 3342 boolean rightPaddingDefined = false; 3343 boolean startPaddingDefined = false; 3344 boolean endPaddingDefined = false; 3345 3346 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3347 3348 final int N = a.getIndexCount(); 3349 for (int i = 0; i < N; i++) { 3350 int attr = a.getIndex(i); 3351 switch (attr) { 3352 case com.android.internal.R.styleable.View_background: 3353 background = a.getDrawable(attr); 3354 break; 3355 case com.android.internal.R.styleable.View_padding: 3356 padding = a.getDimensionPixelSize(attr, -1); 3357 mUserPaddingLeftInitial = padding; 3358 mUserPaddingRightInitial = padding; 3359 leftPaddingDefined = true; 3360 rightPaddingDefined = true; 3361 break; 3362 case com.android.internal.R.styleable.View_paddingLeft: 3363 leftPadding = a.getDimensionPixelSize(attr, -1); 3364 mUserPaddingLeftInitial = leftPadding; 3365 leftPaddingDefined = true; 3366 break; 3367 case com.android.internal.R.styleable.View_paddingTop: 3368 topPadding = a.getDimensionPixelSize(attr, -1); 3369 break; 3370 case com.android.internal.R.styleable.View_paddingRight: 3371 rightPadding = a.getDimensionPixelSize(attr, -1); 3372 mUserPaddingRightInitial = rightPadding; 3373 rightPaddingDefined = true; 3374 break; 3375 case com.android.internal.R.styleable.View_paddingBottom: 3376 bottomPadding = a.getDimensionPixelSize(attr, -1); 3377 break; 3378 case com.android.internal.R.styleable.View_paddingStart: 3379 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3380 startPaddingDefined = true; 3381 break; 3382 case com.android.internal.R.styleable.View_paddingEnd: 3383 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3384 endPaddingDefined = true; 3385 break; 3386 case com.android.internal.R.styleable.View_scrollX: 3387 x = a.getDimensionPixelOffset(attr, 0); 3388 break; 3389 case com.android.internal.R.styleable.View_scrollY: 3390 y = a.getDimensionPixelOffset(attr, 0); 3391 break; 3392 case com.android.internal.R.styleable.View_alpha: 3393 setAlpha(a.getFloat(attr, 1f)); 3394 break; 3395 case com.android.internal.R.styleable.View_transformPivotX: 3396 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3397 break; 3398 case com.android.internal.R.styleable.View_transformPivotY: 3399 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3400 break; 3401 case com.android.internal.R.styleable.View_translationX: 3402 tx = a.getDimensionPixelOffset(attr, 0); 3403 transformSet = true; 3404 break; 3405 case com.android.internal.R.styleable.View_translationY: 3406 ty = a.getDimensionPixelOffset(attr, 0); 3407 transformSet = true; 3408 break; 3409 case com.android.internal.R.styleable.View_rotation: 3410 rotation = a.getFloat(attr, 0); 3411 transformSet = true; 3412 break; 3413 case com.android.internal.R.styleable.View_rotationX: 3414 rotationX = a.getFloat(attr, 0); 3415 transformSet = true; 3416 break; 3417 case com.android.internal.R.styleable.View_rotationY: 3418 rotationY = a.getFloat(attr, 0); 3419 transformSet = true; 3420 break; 3421 case com.android.internal.R.styleable.View_scaleX: 3422 sx = a.getFloat(attr, 1f); 3423 transformSet = true; 3424 break; 3425 case com.android.internal.R.styleable.View_scaleY: 3426 sy = a.getFloat(attr, 1f); 3427 transformSet = true; 3428 break; 3429 case com.android.internal.R.styleable.View_id: 3430 mID = a.getResourceId(attr, NO_ID); 3431 break; 3432 case com.android.internal.R.styleable.View_tag: 3433 mTag = a.getText(attr); 3434 break; 3435 case com.android.internal.R.styleable.View_fitsSystemWindows: 3436 if (a.getBoolean(attr, false)) { 3437 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3438 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3439 } 3440 break; 3441 case com.android.internal.R.styleable.View_focusable: 3442 if (a.getBoolean(attr, false)) { 3443 viewFlagValues |= FOCUSABLE; 3444 viewFlagMasks |= FOCUSABLE_MASK; 3445 } 3446 break; 3447 case com.android.internal.R.styleable.View_focusableInTouchMode: 3448 if (a.getBoolean(attr, false)) { 3449 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3450 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3451 } 3452 break; 3453 case com.android.internal.R.styleable.View_clickable: 3454 if (a.getBoolean(attr, false)) { 3455 viewFlagValues |= CLICKABLE; 3456 viewFlagMasks |= CLICKABLE; 3457 } 3458 break; 3459 case com.android.internal.R.styleable.View_longClickable: 3460 if (a.getBoolean(attr, false)) { 3461 viewFlagValues |= LONG_CLICKABLE; 3462 viewFlagMasks |= LONG_CLICKABLE; 3463 } 3464 break; 3465 case com.android.internal.R.styleable.View_saveEnabled: 3466 if (!a.getBoolean(attr, true)) { 3467 viewFlagValues |= SAVE_DISABLED; 3468 viewFlagMasks |= SAVE_DISABLED_MASK; 3469 } 3470 break; 3471 case com.android.internal.R.styleable.View_duplicateParentState: 3472 if (a.getBoolean(attr, false)) { 3473 viewFlagValues |= DUPLICATE_PARENT_STATE; 3474 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3475 } 3476 break; 3477 case com.android.internal.R.styleable.View_visibility: 3478 final int visibility = a.getInt(attr, 0); 3479 if (visibility != 0) { 3480 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3481 viewFlagMasks |= VISIBILITY_MASK; 3482 } 3483 break; 3484 case com.android.internal.R.styleable.View_layoutDirection: 3485 // Clear any layout direction flags (included resolved bits) already set 3486 mPrivateFlags2 &= 3487 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3488 // Set the layout direction flags depending on the value of the attribute 3489 final int layoutDirection = a.getInt(attr, -1); 3490 final int value = (layoutDirection != -1) ? 3491 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3492 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3493 break; 3494 case com.android.internal.R.styleable.View_drawingCacheQuality: 3495 final int cacheQuality = a.getInt(attr, 0); 3496 if (cacheQuality != 0) { 3497 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3498 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3499 } 3500 break; 3501 case com.android.internal.R.styleable.View_contentDescription: 3502 setContentDescription(a.getString(attr)); 3503 break; 3504 case com.android.internal.R.styleable.View_labelFor: 3505 setLabelFor(a.getResourceId(attr, NO_ID)); 3506 break; 3507 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3508 if (!a.getBoolean(attr, true)) { 3509 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3510 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3511 } 3512 break; 3513 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3514 if (!a.getBoolean(attr, true)) { 3515 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3516 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3517 } 3518 break; 3519 case R.styleable.View_scrollbars: 3520 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3521 if (scrollbars != SCROLLBARS_NONE) { 3522 viewFlagValues |= scrollbars; 3523 viewFlagMasks |= SCROLLBARS_MASK; 3524 initializeScrollbars = true; 3525 } 3526 break; 3527 //noinspection deprecation 3528 case R.styleable.View_fadingEdge: 3529 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3530 // Ignore the attribute starting with ICS 3531 break; 3532 } 3533 // With builds < ICS, fall through and apply fading edges 3534 case R.styleable.View_requiresFadingEdge: 3535 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3536 if (fadingEdge != FADING_EDGE_NONE) { 3537 viewFlagValues |= fadingEdge; 3538 viewFlagMasks |= FADING_EDGE_MASK; 3539 initializeFadingEdge(a); 3540 } 3541 break; 3542 case R.styleable.View_scrollbarStyle: 3543 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3544 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3545 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3546 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3547 } 3548 break; 3549 case R.styleable.View_isScrollContainer: 3550 setScrollContainer = true; 3551 if (a.getBoolean(attr, false)) { 3552 setScrollContainer(true); 3553 } 3554 break; 3555 case com.android.internal.R.styleable.View_keepScreenOn: 3556 if (a.getBoolean(attr, false)) { 3557 viewFlagValues |= KEEP_SCREEN_ON; 3558 viewFlagMasks |= KEEP_SCREEN_ON; 3559 } 3560 break; 3561 case R.styleable.View_filterTouchesWhenObscured: 3562 if (a.getBoolean(attr, false)) { 3563 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3564 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3565 } 3566 break; 3567 case R.styleable.View_nextFocusLeft: 3568 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3569 break; 3570 case R.styleable.View_nextFocusRight: 3571 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3572 break; 3573 case R.styleable.View_nextFocusUp: 3574 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3575 break; 3576 case R.styleable.View_nextFocusDown: 3577 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3578 break; 3579 case R.styleable.View_nextFocusForward: 3580 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3581 break; 3582 case R.styleable.View_minWidth: 3583 mMinWidth = a.getDimensionPixelSize(attr, 0); 3584 break; 3585 case R.styleable.View_minHeight: 3586 mMinHeight = a.getDimensionPixelSize(attr, 0); 3587 break; 3588 case R.styleable.View_onClick: 3589 if (context.isRestricted()) { 3590 throw new IllegalStateException("The android:onClick attribute cannot " 3591 + "be used within a restricted context"); 3592 } 3593 3594 final String handlerName = a.getString(attr); 3595 if (handlerName != null) { 3596 setOnClickListener(new OnClickListener() { 3597 private Method mHandler; 3598 3599 public void onClick(View v) { 3600 if (mHandler == null) { 3601 try { 3602 mHandler = getContext().getClass().getMethod(handlerName, 3603 View.class); 3604 } catch (NoSuchMethodException e) { 3605 int id = getId(); 3606 String idText = id == NO_ID ? "" : " with id '" 3607 + getContext().getResources().getResourceEntryName( 3608 id) + "'"; 3609 throw new IllegalStateException("Could not find a method " + 3610 handlerName + "(View) in the activity " 3611 + getContext().getClass() + " for onClick handler" 3612 + " on view " + View.this.getClass() + idText, e); 3613 } 3614 } 3615 3616 try { 3617 mHandler.invoke(getContext(), View.this); 3618 } catch (IllegalAccessException e) { 3619 throw new IllegalStateException("Could not execute non " 3620 + "public method of the activity", e); 3621 } catch (InvocationTargetException e) { 3622 throw new IllegalStateException("Could not execute " 3623 + "method of the activity", e); 3624 } 3625 } 3626 }); 3627 } 3628 break; 3629 case R.styleable.View_overScrollMode: 3630 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3631 break; 3632 case R.styleable.View_verticalScrollbarPosition: 3633 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3634 break; 3635 case R.styleable.View_layerType: 3636 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3637 break; 3638 case R.styleable.View_textDirection: 3639 // Clear any text direction flag already set 3640 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3641 // Set the text direction flags depending on the value of the attribute 3642 final int textDirection = a.getInt(attr, -1); 3643 if (textDirection != -1) { 3644 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3645 } 3646 break; 3647 case R.styleable.View_textAlignment: 3648 // Clear any text alignment flag already set 3649 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3650 // Set the text alignment flag depending on the value of the attribute 3651 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3652 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3653 break; 3654 case R.styleable.View_importantForAccessibility: 3655 setImportantForAccessibility(a.getInt(attr, 3656 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3657 break; 3658 } 3659 } 3660 3661 setOverScrollMode(overScrollMode); 3662 3663 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3664 // the resolved layout direction). Those cached values will be used later during padding 3665 // resolution. 3666 mUserPaddingStart = startPadding; 3667 mUserPaddingEnd = endPadding; 3668 3669 if (background != null) { 3670 setBackground(background); 3671 } 3672 3673 if (padding >= 0) { 3674 leftPadding = padding; 3675 topPadding = padding; 3676 rightPadding = padding; 3677 bottomPadding = padding; 3678 mUserPaddingLeftInitial = padding; 3679 mUserPaddingRightInitial = padding; 3680 } 3681 3682 if (isRtlCompatibilityMode()) { 3683 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3684 // left / right padding are used if defined (meaning here nothing to do). If they are not 3685 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3686 // start / end and resolve them as left / right (layout direction is not taken into account). 3687 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3688 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3689 // defined. 3690 if (!leftPaddingDefined && startPaddingDefined) { 3691 leftPadding = startPadding; 3692 } 3693 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3694 if (!rightPaddingDefined && endPaddingDefined) { 3695 rightPadding = endPadding; 3696 } 3697 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3698 } else { 3699 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3700 // values defined. Otherwise, left /right values are used. 3701 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3702 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3703 // defined. 3704 if (leftPaddingDefined) { 3705 mUserPaddingLeftInitial = leftPadding; 3706 } 3707 if (rightPaddingDefined) { 3708 mUserPaddingRightInitial = rightPadding; 3709 } 3710 } 3711 3712 internalSetPadding( 3713 mUserPaddingLeftInitial, 3714 topPadding >= 0 ? topPadding : mPaddingTop, 3715 mUserPaddingRightInitial, 3716 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3717 3718 if (viewFlagMasks != 0) { 3719 setFlags(viewFlagValues, viewFlagMasks); 3720 } 3721 3722 if (initializeScrollbars) { 3723 initializeScrollbars(a); 3724 } 3725 3726 a.recycle(); 3727 3728 // Needs to be called after mViewFlags is set 3729 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3730 recomputePadding(); 3731 } 3732 3733 if (x != 0 || y != 0) { 3734 scrollTo(x, y); 3735 } 3736 3737 if (transformSet) { 3738 setTranslationX(tx); 3739 setTranslationY(ty); 3740 setRotation(rotation); 3741 setRotationX(rotationX); 3742 setRotationY(rotationY); 3743 setScaleX(sx); 3744 setScaleY(sy); 3745 } 3746 3747 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3748 setScrollContainer(true); 3749 } 3750 3751 computeOpaqueFlags(); 3752 } 3753 3754 /** 3755 * Non-public constructor for use in testing 3756 */ 3757 View() { 3758 mResources = null; 3759 } 3760 3761 public String toString() { 3762 StringBuilder out = new StringBuilder(128); 3763 out.append(getClass().getName()); 3764 out.append('{'); 3765 out.append(Integer.toHexString(System.identityHashCode(this))); 3766 out.append(' '); 3767 switch (mViewFlags&VISIBILITY_MASK) { 3768 case VISIBLE: out.append('V'); break; 3769 case INVISIBLE: out.append('I'); break; 3770 case GONE: out.append('G'); break; 3771 default: out.append('.'); break; 3772 } 3773 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3774 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3775 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3776 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3777 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3778 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3779 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3780 out.append(' '); 3781 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3782 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3783 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3784 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3785 out.append('p'); 3786 } else { 3787 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3788 } 3789 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3790 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3791 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3792 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3793 out.append(' '); 3794 out.append(mLeft); 3795 out.append(','); 3796 out.append(mTop); 3797 out.append('-'); 3798 out.append(mRight); 3799 out.append(','); 3800 out.append(mBottom); 3801 final int id = getId(); 3802 if (id != NO_ID) { 3803 out.append(" #"); 3804 out.append(Integer.toHexString(id)); 3805 final Resources r = mResources; 3806 if (id != 0 && r != null) { 3807 try { 3808 String pkgname; 3809 switch (id&0xff000000) { 3810 case 0x7f000000: 3811 pkgname="app"; 3812 break; 3813 case 0x01000000: 3814 pkgname="android"; 3815 break; 3816 default: 3817 pkgname = r.getResourcePackageName(id); 3818 break; 3819 } 3820 String typename = r.getResourceTypeName(id); 3821 String entryname = r.getResourceEntryName(id); 3822 out.append(" "); 3823 out.append(pkgname); 3824 out.append(":"); 3825 out.append(typename); 3826 out.append("/"); 3827 out.append(entryname); 3828 } catch (Resources.NotFoundException e) { 3829 } 3830 } 3831 } 3832 out.append("}"); 3833 return out.toString(); 3834 } 3835 3836 /** 3837 * <p> 3838 * Initializes the fading edges from a given set of styled attributes. This 3839 * method should be called by subclasses that need fading edges and when an 3840 * instance of these subclasses is created programmatically rather than 3841 * being inflated from XML. This method is automatically called when the XML 3842 * is inflated. 3843 * </p> 3844 * 3845 * @param a the styled attributes set to initialize the fading edges from 3846 */ 3847 protected void initializeFadingEdge(TypedArray a) { 3848 initScrollCache(); 3849 3850 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3851 R.styleable.View_fadingEdgeLength, 3852 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3853 } 3854 3855 /** 3856 * Returns the size of the vertical faded edges used to indicate that more 3857 * content in this view is visible. 3858 * 3859 * @return The size in pixels of the vertical faded edge or 0 if vertical 3860 * faded edges are not enabled for this view. 3861 * @attr ref android.R.styleable#View_fadingEdgeLength 3862 */ 3863 public int getVerticalFadingEdgeLength() { 3864 if (isVerticalFadingEdgeEnabled()) { 3865 ScrollabilityCache cache = mScrollCache; 3866 if (cache != null) { 3867 return cache.fadingEdgeLength; 3868 } 3869 } 3870 return 0; 3871 } 3872 3873 /** 3874 * Set the size of the faded edge used to indicate that more content in this 3875 * view is available. Will not change whether the fading edge is enabled; use 3876 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3877 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3878 * for the vertical or horizontal fading edges. 3879 * 3880 * @param length The size in pixels of the faded edge used to indicate that more 3881 * content in this view is visible. 3882 */ 3883 public void setFadingEdgeLength(int length) { 3884 initScrollCache(); 3885 mScrollCache.fadingEdgeLength = length; 3886 } 3887 3888 /** 3889 * Returns the size of the horizontal faded edges used to indicate that more 3890 * content in this view is visible. 3891 * 3892 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3893 * faded edges are not enabled for this view. 3894 * @attr ref android.R.styleable#View_fadingEdgeLength 3895 */ 3896 public int getHorizontalFadingEdgeLength() { 3897 if (isHorizontalFadingEdgeEnabled()) { 3898 ScrollabilityCache cache = mScrollCache; 3899 if (cache != null) { 3900 return cache.fadingEdgeLength; 3901 } 3902 } 3903 return 0; 3904 } 3905 3906 /** 3907 * Returns the width of the vertical scrollbar. 3908 * 3909 * @return The width in pixels of the vertical scrollbar or 0 if there 3910 * is no vertical scrollbar. 3911 */ 3912 public int getVerticalScrollbarWidth() { 3913 ScrollabilityCache cache = mScrollCache; 3914 if (cache != null) { 3915 ScrollBarDrawable scrollBar = cache.scrollBar; 3916 if (scrollBar != null) { 3917 int size = scrollBar.getSize(true); 3918 if (size <= 0) { 3919 size = cache.scrollBarSize; 3920 } 3921 return size; 3922 } 3923 return 0; 3924 } 3925 return 0; 3926 } 3927 3928 /** 3929 * Returns the height of the horizontal scrollbar. 3930 * 3931 * @return The height in pixels of the horizontal scrollbar or 0 if 3932 * there is no horizontal scrollbar. 3933 */ 3934 protected int getHorizontalScrollbarHeight() { 3935 ScrollabilityCache cache = mScrollCache; 3936 if (cache != null) { 3937 ScrollBarDrawable scrollBar = cache.scrollBar; 3938 if (scrollBar != null) { 3939 int size = scrollBar.getSize(false); 3940 if (size <= 0) { 3941 size = cache.scrollBarSize; 3942 } 3943 return size; 3944 } 3945 return 0; 3946 } 3947 return 0; 3948 } 3949 3950 /** 3951 * <p> 3952 * Initializes the scrollbars from a given set of styled attributes. This 3953 * method should be called by subclasses that need scrollbars and when an 3954 * instance of these subclasses is created programmatically rather than 3955 * being inflated from XML. This method is automatically called when the XML 3956 * is inflated. 3957 * </p> 3958 * 3959 * @param a the styled attributes set to initialize the scrollbars from 3960 */ 3961 protected void initializeScrollbars(TypedArray a) { 3962 initScrollCache(); 3963 3964 final ScrollabilityCache scrollabilityCache = mScrollCache; 3965 3966 if (scrollabilityCache.scrollBar == null) { 3967 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3968 } 3969 3970 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3971 3972 if (!fadeScrollbars) { 3973 scrollabilityCache.state = ScrollabilityCache.ON; 3974 } 3975 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3976 3977 3978 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3979 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3980 .getScrollBarFadeDuration()); 3981 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3982 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3983 ViewConfiguration.getScrollDefaultDelay()); 3984 3985 3986 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3987 com.android.internal.R.styleable.View_scrollbarSize, 3988 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3989 3990 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3991 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3992 3993 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3994 if (thumb != null) { 3995 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3996 } 3997 3998 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3999 false); 4000 if (alwaysDraw) { 4001 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4002 } 4003 4004 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4005 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4006 4007 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4008 if (thumb != null) { 4009 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4010 } 4011 4012 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4013 false); 4014 if (alwaysDraw) { 4015 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4016 } 4017 4018 // Apply layout direction to the new Drawables if needed 4019 final int layoutDirection = getLayoutDirection(); 4020 if (track != null) { 4021 track.setLayoutDirection(layoutDirection); 4022 } 4023 if (thumb != null) { 4024 thumb.setLayoutDirection(layoutDirection); 4025 } 4026 4027 // Re-apply user/background padding so that scrollbar(s) get added 4028 resolvePadding(); 4029 } 4030 4031 /** 4032 * <p> 4033 * Initalizes the scrollability cache if necessary. 4034 * </p> 4035 */ 4036 private void initScrollCache() { 4037 if (mScrollCache == null) { 4038 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4039 } 4040 } 4041 4042 private ScrollabilityCache getScrollCache() { 4043 initScrollCache(); 4044 return mScrollCache; 4045 } 4046 4047 /** 4048 * Set the position of the vertical scroll bar. Should be one of 4049 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4050 * {@link #SCROLLBAR_POSITION_RIGHT}. 4051 * 4052 * @param position Where the vertical scroll bar should be positioned. 4053 */ 4054 public void setVerticalScrollbarPosition(int position) { 4055 if (mVerticalScrollbarPosition != position) { 4056 mVerticalScrollbarPosition = position; 4057 computeOpaqueFlags(); 4058 resolvePadding(); 4059 } 4060 } 4061 4062 /** 4063 * @return The position where the vertical scroll bar will show, if applicable. 4064 * @see #setVerticalScrollbarPosition(int) 4065 */ 4066 public int getVerticalScrollbarPosition() { 4067 return mVerticalScrollbarPosition; 4068 } 4069 4070 ListenerInfo getListenerInfo() { 4071 if (mListenerInfo != null) { 4072 return mListenerInfo; 4073 } 4074 mListenerInfo = new ListenerInfo(); 4075 return mListenerInfo; 4076 } 4077 4078 /** 4079 * Register a callback to be invoked when focus of this view changed. 4080 * 4081 * @param l The callback that will run. 4082 */ 4083 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4084 getListenerInfo().mOnFocusChangeListener = l; 4085 } 4086 4087 /** 4088 * Add a listener that will be called when the bounds of the view change due to 4089 * layout processing. 4090 * 4091 * @param listener The listener that will be called when layout bounds change. 4092 */ 4093 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4094 ListenerInfo li = getListenerInfo(); 4095 if (li.mOnLayoutChangeListeners == null) { 4096 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4097 } 4098 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4099 li.mOnLayoutChangeListeners.add(listener); 4100 } 4101 } 4102 4103 /** 4104 * Remove a listener for layout changes. 4105 * 4106 * @param listener The listener for layout bounds change. 4107 */ 4108 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4109 ListenerInfo li = mListenerInfo; 4110 if (li == null || li.mOnLayoutChangeListeners == null) { 4111 return; 4112 } 4113 li.mOnLayoutChangeListeners.remove(listener); 4114 } 4115 4116 /** 4117 * Add a listener for attach state changes. 4118 * 4119 * This listener will be called whenever this view is attached or detached 4120 * from a window. Remove the listener using 4121 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4122 * 4123 * @param listener Listener to attach 4124 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4125 */ 4126 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4127 ListenerInfo li = getListenerInfo(); 4128 if (li.mOnAttachStateChangeListeners == null) { 4129 li.mOnAttachStateChangeListeners 4130 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4131 } 4132 li.mOnAttachStateChangeListeners.add(listener); 4133 } 4134 4135 /** 4136 * Remove a listener for attach state changes. The listener will receive no further 4137 * notification of window attach/detach events. 4138 * 4139 * @param listener Listener to remove 4140 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4141 */ 4142 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4143 ListenerInfo li = mListenerInfo; 4144 if (li == null || li.mOnAttachStateChangeListeners == null) { 4145 return; 4146 } 4147 li.mOnAttachStateChangeListeners.remove(listener); 4148 } 4149 4150 /** 4151 * Returns the focus-change callback registered for this view. 4152 * 4153 * @return The callback, or null if one is not registered. 4154 */ 4155 public OnFocusChangeListener getOnFocusChangeListener() { 4156 ListenerInfo li = mListenerInfo; 4157 return li != null ? li.mOnFocusChangeListener : null; 4158 } 4159 4160 /** 4161 * Register a callback to be invoked when this view is clicked. If this view is not 4162 * clickable, it becomes clickable. 4163 * 4164 * @param l The callback that will run 4165 * 4166 * @see #setClickable(boolean) 4167 */ 4168 public void setOnClickListener(OnClickListener l) { 4169 if (!isClickable()) { 4170 setClickable(true); 4171 } 4172 getListenerInfo().mOnClickListener = l; 4173 } 4174 4175 /** 4176 * Return whether this view has an attached OnClickListener. Returns 4177 * true if there is a listener, false if there is none. 4178 */ 4179 public boolean hasOnClickListeners() { 4180 ListenerInfo li = mListenerInfo; 4181 return (li != null && li.mOnClickListener != null); 4182 } 4183 4184 /** 4185 * Register a callback to be invoked when this view is clicked and held. If this view is not 4186 * long clickable, it becomes long clickable. 4187 * 4188 * @param l The callback that will run 4189 * 4190 * @see #setLongClickable(boolean) 4191 */ 4192 public void setOnLongClickListener(OnLongClickListener l) { 4193 if (!isLongClickable()) { 4194 setLongClickable(true); 4195 } 4196 getListenerInfo().mOnLongClickListener = l; 4197 } 4198 4199 /** 4200 * Register a callback to be invoked when the context menu for this view is 4201 * being built. If this view is not long clickable, it becomes long clickable. 4202 * 4203 * @param l The callback that will run 4204 * 4205 */ 4206 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4207 if (!isLongClickable()) { 4208 setLongClickable(true); 4209 } 4210 getListenerInfo().mOnCreateContextMenuListener = l; 4211 } 4212 4213 /** 4214 * Call this view's OnClickListener, if it is defined. Performs all normal 4215 * actions associated with clicking: reporting accessibility event, playing 4216 * a sound, etc. 4217 * 4218 * @return True there was an assigned OnClickListener that was called, false 4219 * otherwise is returned. 4220 */ 4221 public boolean performClick() { 4222 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4223 4224 ListenerInfo li = mListenerInfo; 4225 if (li != null && li.mOnClickListener != null) { 4226 playSoundEffect(SoundEffectConstants.CLICK); 4227 li.mOnClickListener.onClick(this); 4228 return true; 4229 } 4230 4231 return false; 4232 } 4233 4234 /** 4235 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4236 * this only calls the listener, and does not do any associated clicking 4237 * actions like reporting an accessibility event. 4238 * 4239 * @return True there was an assigned OnClickListener that was called, false 4240 * otherwise is returned. 4241 */ 4242 public boolean callOnClick() { 4243 ListenerInfo li = mListenerInfo; 4244 if (li != null && li.mOnClickListener != null) { 4245 li.mOnClickListener.onClick(this); 4246 return true; 4247 } 4248 return false; 4249 } 4250 4251 /** 4252 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4253 * OnLongClickListener did not consume the event. 4254 * 4255 * @return True if one of the above receivers consumed the event, false otherwise. 4256 */ 4257 public boolean performLongClick() { 4258 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4259 4260 boolean handled = false; 4261 ListenerInfo li = mListenerInfo; 4262 if (li != null && li.mOnLongClickListener != null) { 4263 handled = li.mOnLongClickListener.onLongClick(View.this); 4264 } 4265 if (!handled) { 4266 handled = showContextMenu(); 4267 } 4268 if (handled) { 4269 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4270 } 4271 return handled; 4272 } 4273 4274 /** 4275 * Performs button-related actions during a touch down event. 4276 * 4277 * @param event The event. 4278 * @return True if the down was consumed. 4279 * 4280 * @hide 4281 */ 4282 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4283 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4284 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4285 return true; 4286 } 4287 } 4288 return false; 4289 } 4290 4291 /** 4292 * Bring up the context menu for this view. 4293 * 4294 * @return Whether a context menu was displayed. 4295 */ 4296 public boolean showContextMenu() { 4297 return getParent().showContextMenuForChild(this); 4298 } 4299 4300 /** 4301 * Bring up the context menu for this view, referring to the item under the specified point. 4302 * 4303 * @param x The referenced x coordinate. 4304 * @param y The referenced y coordinate. 4305 * @param metaState The keyboard modifiers that were pressed. 4306 * @return Whether a context menu was displayed. 4307 * 4308 * @hide 4309 */ 4310 public boolean showContextMenu(float x, float y, int metaState) { 4311 return showContextMenu(); 4312 } 4313 4314 /** 4315 * Start an action mode. 4316 * 4317 * @param callback Callback that will control the lifecycle of the action mode 4318 * @return The new action mode if it is started, null otherwise 4319 * 4320 * @see ActionMode 4321 */ 4322 public ActionMode startActionMode(ActionMode.Callback callback) { 4323 ViewParent parent = getParent(); 4324 if (parent == null) return null; 4325 return parent.startActionModeForChild(this, callback); 4326 } 4327 4328 /** 4329 * Register a callback to be invoked when a hardware key is pressed in this view. 4330 * Key presses in software input methods will generally not trigger the methods of 4331 * this listener. 4332 * @param l the key listener to attach to this view 4333 */ 4334 public void setOnKeyListener(OnKeyListener l) { 4335 getListenerInfo().mOnKeyListener = l; 4336 } 4337 4338 /** 4339 * Register a callback to be invoked when a touch event is sent to this view. 4340 * @param l the touch listener to attach to this view 4341 */ 4342 public void setOnTouchListener(OnTouchListener l) { 4343 getListenerInfo().mOnTouchListener = l; 4344 } 4345 4346 /** 4347 * Register a callback to be invoked when a generic motion event is sent to this view. 4348 * @param l the generic motion listener to attach to this view 4349 */ 4350 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4351 getListenerInfo().mOnGenericMotionListener = l; 4352 } 4353 4354 /** 4355 * Register a callback to be invoked when a hover event is sent to this view. 4356 * @param l the hover listener to attach to this view 4357 */ 4358 public void setOnHoverListener(OnHoverListener l) { 4359 getListenerInfo().mOnHoverListener = l; 4360 } 4361 4362 /** 4363 * Register a drag event listener callback object for this View. The parameter is 4364 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4365 * View, the system calls the 4366 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4367 * @param l An implementation of {@link android.view.View.OnDragListener}. 4368 */ 4369 public void setOnDragListener(OnDragListener l) { 4370 getListenerInfo().mOnDragListener = l; 4371 } 4372 4373 /** 4374 * Give this view focus. This will cause 4375 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4376 * 4377 * Note: this does not check whether this {@link View} should get focus, it just 4378 * gives it focus no matter what. It should only be called internally by framework 4379 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4380 * 4381 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4382 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4383 * focus moved when requestFocus() is called. It may not always 4384 * apply, in which case use the default View.FOCUS_DOWN. 4385 * @param previouslyFocusedRect The rectangle of the view that had focus 4386 * prior in this View's coordinate system. 4387 */ 4388 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4389 if (DBG) { 4390 System.out.println(this + " requestFocus()"); 4391 } 4392 4393 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4394 mPrivateFlags |= PFLAG_FOCUSED; 4395 4396 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4397 4398 if (mParent != null) { 4399 mParent.requestChildFocus(this, this); 4400 } 4401 4402 if (mAttachInfo != null) { 4403 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4404 } 4405 4406 onFocusChanged(true, direction, previouslyFocusedRect); 4407 refreshDrawableState(); 4408 4409 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4410 notifyAccessibilityStateChanged(); 4411 } 4412 } 4413 } 4414 4415 /** 4416 * Request that a rectangle of this view be visible on the screen, 4417 * scrolling if necessary just enough. 4418 * 4419 * <p>A View should call this if it maintains some notion of which part 4420 * of its content is interesting. For example, a text editing view 4421 * should call this when its cursor moves. 4422 * 4423 * @param rectangle The rectangle. 4424 * @return Whether any parent scrolled. 4425 */ 4426 public boolean requestRectangleOnScreen(Rect rectangle) { 4427 return requestRectangleOnScreen(rectangle, false); 4428 } 4429 4430 /** 4431 * Request that a rectangle of this view be visible on the screen, 4432 * scrolling if necessary just enough. 4433 * 4434 * <p>A View should call this if it maintains some notion of which part 4435 * of its content is interesting. For example, a text editing view 4436 * should call this when its cursor moves. 4437 * 4438 * <p>When <code>immediate</code> is set to true, scrolling will not be 4439 * animated. 4440 * 4441 * @param rectangle The rectangle. 4442 * @param immediate True to forbid animated scrolling, false otherwise 4443 * @return Whether any parent scrolled. 4444 */ 4445 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4446 if (mParent == null) { 4447 return false; 4448 } 4449 4450 View child = this; 4451 4452 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4453 position.set(rectangle); 4454 4455 ViewParent parent = mParent; 4456 boolean scrolled = false; 4457 while (parent != null) { 4458 rectangle.set((int) position.left, (int) position.top, 4459 (int) position.right, (int) position.bottom); 4460 4461 scrolled |= parent.requestChildRectangleOnScreen(child, 4462 rectangle, immediate); 4463 4464 if (!child.hasIdentityMatrix()) { 4465 child.getMatrix().mapRect(position); 4466 } 4467 4468 position.offset(child.mLeft, child.mTop); 4469 4470 if (!(parent instanceof View)) { 4471 break; 4472 } 4473 4474 View parentView = (View) parent; 4475 4476 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4477 4478 child = parentView; 4479 parent = child.getParent(); 4480 } 4481 4482 return scrolled; 4483 } 4484 4485 /** 4486 * Called when this view wants to give up focus. If focus is cleared 4487 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4488 * <p> 4489 * <strong>Note:</strong> When a View clears focus the framework is trying 4490 * to give focus to the first focusable View from the top. Hence, if this 4491 * View is the first from the top that can take focus, then all callbacks 4492 * related to clearing focus will be invoked after wich the framework will 4493 * give focus to this view. 4494 * </p> 4495 */ 4496 public void clearFocus() { 4497 if (DBG) { 4498 System.out.println(this + " clearFocus()"); 4499 } 4500 4501 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4502 mPrivateFlags &= ~PFLAG_FOCUSED; 4503 4504 if (mParent != null) { 4505 mParent.clearChildFocus(this); 4506 } 4507 4508 onFocusChanged(false, 0, null); 4509 4510 refreshDrawableState(); 4511 4512 if (!rootViewRequestFocus()) { 4513 notifyGlobalFocusCleared(this); 4514 } 4515 4516 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4517 notifyAccessibilityStateChanged(); 4518 } 4519 } 4520 } 4521 4522 void notifyGlobalFocusCleared(View oldFocus) { 4523 if (oldFocus != null && mAttachInfo != null) { 4524 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 4525 } 4526 } 4527 4528 boolean rootViewRequestFocus() { 4529 View root = getRootView(); 4530 if (root != null) { 4531 return root.requestFocus(); 4532 } 4533 return false; 4534 } 4535 4536 /** 4537 * Called internally by the view system when a new view is getting focus. 4538 * This is what clears the old focus. 4539 */ 4540 void unFocus() { 4541 if (DBG) { 4542 System.out.println(this + " unFocus()"); 4543 } 4544 4545 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4546 mPrivateFlags &= ~PFLAG_FOCUSED; 4547 4548 onFocusChanged(false, 0, null); 4549 refreshDrawableState(); 4550 4551 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4552 notifyAccessibilityStateChanged(); 4553 } 4554 } 4555 } 4556 4557 /** 4558 * Returns true if this view has focus iteself, or is the ancestor of the 4559 * view that has focus. 4560 * 4561 * @return True if this view has or contains focus, false otherwise. 4562 */ 4563 @ViewDebug.ExportedProperty(category = "focus") 4564 public boolean hasFocus() { 4565 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4566 } 4567 4568 /** 4569 * Returns true if this view is focusable or if it contains a reachable View 4570 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4571 * is a View whose parents do not block descendants focus. 4572 * 4573 * Only {@link #VISIBLE} views are considered focusable. 4574 * 4575 * @return True if the view is focusable or if the view contains a focusable 4576 * View, false otherwise. 4577 * 4578 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4579 */ 4580 public boolean hasFocusable() { 4581 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4582 } 4583 4584 /** 4585 * Called by the view system when the focus state of this view changes. 4586 * When the focus change event is caused by directional navigation, direction 4587 * and previouslyFocusedRect provide insight into where the focus is coming from. 4588 * When overriding, be sure to call up through to the super class so that 4589 * the standard focus handling will occur. 4590 * 4591 * @param gainFocus True if the View has focus; false otherwise. 4592 * @param direction The direction focus has moved when requestFocus() 4593 * is called to give this view focus. Values are 4594 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4595 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4596 * It may not always apply, in which case use the default. 4597 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4598 * system, of the previously focused view. If applicable, this will be 4599 * passed in as finer grained information about where the focus is coming 4600 * from (in addition to direction). Will be <code>null</code> otherwise. 4601 */ 4602 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4603 if (gainFocus) { 4604 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4605 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4606 } 4607 } 4608 4609 InputMethodManager imm = InputMethodManager.peekInstance(); 4610 if (!gainFocus) { 4611 if (isPressed()) { 4612 setPressed(false); 4613 } 4614 if (imm != null && mAttachInfo != null 4615 && mAttachInfo.mHasWindowFocus) { 4616 imm.focusOut(this); 4617 } 4618 onFocusLost(); 4619 } else if (imm != null && mAttachInfo != null 4620 && mAttachInfo.mHasWindowFocus) { 4621 imm.focusIn(this); 4622 } 4623 4624 invalidate(true); 4625 ListenerInfo li = mListenerInfo; 4626 if (li != null && li.mOnFocusChangeListener != null) { 4627 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4628 } 4629 4630 if (mAttachInfo != null) { 4631 mAttachInfo.mKeyDispatchState.reset(this); 4632 } 4633 } 4634 4635 /** 4636 * Sends an accessibility event of the given type. If accessibility is 4637 * not enabled this method has no effect. The default implementation calls 4638 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4639 * to populate information about the event source (this View), then calls 4640 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4641 * populate the text content of the event source including its descendants, 4642 * and last calls 4643 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4644 * on its parent to resuest sending of the event to interested parties. 4645 * <p> 4646 * If an {@link AccessibilityDelegate} has been specified via calling 4647 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4648 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4649 * responsible for handling this call. 4650 * </p> 4651 * 4652 * @param eventType The type of the event to send, as defined by several types from 4653 * {@link android.view.accessibility.AccessibilityEvent}, such as 4654 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4655 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4656 * 4657 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4658 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4659 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4660 * @see AccessibilityDelegate 4661 */ 4662 public void sendAccessibilityEvent(int eventType) { 4663 if (mAccessibilityDelegate != null) { 4664 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4665 } else { 4666 sendAccessibilityEventInternal(eventType); 4667 } 4668 } 4669 4670 /** 4671 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4672 * {@link AccessibilityEvent} to make an announcement which is related to some 4673 * sort of a context change for which none of the events representing UI transitions 4674 * is a good fit. For example, announcing a new page in a book. If accessibility 4675 * is not enabled this method does nothing. 4676 * 4677 * @param text The announcement text. 4678 */ 4679 public void announceForAccessibility(CharSequence text) { 4680 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4681 AccessibilityEvent event = AccessibilityEvent.obtain( 4682 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4683 onInitializeAccessibilityEvent(event); 4684 event.getText().add(text); 4685 event.setContentDescription(null); 4686 mParent.requestSendAccessibilityEvent(this, event); 4687 } 4688 } 4689 4690 /** 4691 * @see #sendAccessibilityEvent(int) 4692 * 4693 * Note: Called from the default {@link AccessibilityDelegate}. 4694 */ 4695 void sendAccessibilityEventInternal(int eventType) { 4696 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4697 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4698 } 4699 } 4700 4701 /** 4702 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4703 * takes as an argument an empty {@link AccessibilityEvent} and does not 4704 * perform a check whether accessibility is enabled. 4705 * <p> 4706 * If an {@link AccessibilityDelegate} has been specified via calling 4707 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4708 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4709 * is responsible for handling this call. 4710 * </p> 4711 * 4712 * @param event The event to send. 4713 * 4714 * @see #sendAccessibilityEvent(int) 4715 */ 4716 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4717 if (mAccessibilityDelegate != null) { 4718 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4719 } else { 4720 sendAccessibilityEventUncheckedInternal(event); 4721 } 4722 } 4723 4724 /** 4725 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4726 * 4727 * Note: Called from the default {@link AccessibilityDelegate}. 4728 */ 4729 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4730 if (!isShown()) { 4731 return; 4732 } 4733 onInitializeAccessibilityEvent(event); 4734 // Only a subset of accessibility events populates text content. 4735 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4736 dispatchPopulateAccessibilityEvent(event); 4737 } 4738 // In the beginning we called #isShown(), so we know that getParent() is not null. 4739 getParent().requestSendAccessibilityEvent(this, event); 4740 } 4741 4742 /** 4743 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4744 * to its children for adding their text content to the event. Note that the 4745 * event text is populated in a separate dispatch path since we add to the 4746 * event not only the text of the source but also the text of all its descendants. 4747 * A typical implementation will call 4748 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4749 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4750 * on each child. Override this method if custom population of the event text 4751 * content is required. 4752 * <p> 4753 * If an {@link AccessibilityDelegate} has been specified via calling 4754 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4755 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4756 * is responsible for handling this call. 4757 * </p> 4758 * <p> 4759 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4760 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4761 * </p> 4762 * 4763 * @param event The event. 4764 * 4765 * @return True if the event population was completed. 4766 */ 4767 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4768 if (mAccessibilityDelegate != null) { 4769 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4770 } else { 4771 return dispatchPopulateAccessibilityEventInternal(event); 4772 } 4773 } 4774 4775 /** 4776 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4777 * 4778 * Note: Called from the default {@link AccessibilityDelegate}. 4779 */ 4780 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4781 onPopulateAccessibilityEvent(event); 4782 return false; 4783 } 4784 4785 /** 4786 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4787 * giving a chance to this View to populate the accessibility event with its 4788 * text content. While this method is free to modify event 4789 * attributes other than text content, doing so should normally be performed in 4790 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4791 * <p> 4792 * Example: Adding formatted date string to an accessibility event in addition 4793 * to the text added by the super implementation: 4794 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4795 * super.onPopulateAccessibilityEvent(event); 4796 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4797 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4798 * mCurrentDate.getTimeInMillis(), flags); 4799 * event.getText().add(selectedDateUtterance); 4800 * }</pre> 4801 * <p> 4802 * If an {@link AccessibilityDelegate} has been specified via calling 4803 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4804 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4805 * is responsible for handling this call. 4806 * </p> 4807 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4808 * information to the event, in case the default implementation has basic information to add. 4809 * </p> 4810 * 4811 * @param event The accessibility event which to populate. 4812 * 4813 * @see #sendAccessibilityEvent(int) 4814 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4815 */ 4816 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4817 if (mAccessibilityDelegate != null) { 4818 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4819 } else { 4820 onPopulateAccessibilityEventInternal(event); 4821 } 4822 } 4823 4824 /** 4825 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4826 * 4827 * Note: Called from the default {@link AccessibilityDelegate}. 4828 */ 4829 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4830 4831 } 4832 4833 /** 4834 * Initializes an {@link AccessibilityEvent} with information about 4835 * this View which is the event source. In other words, the source of 4836 * an accessibility event is the view whose state change triggered firing 4837 * the event. 4838 * <p> 4839 * Example: Setting the password property of an event in addition 4840 * to properties set by the super implementation: 4841 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4842 * super.onInitializeAccessibilityEvent(event); 4843 * event.setPassword(true); 4844 * }</pre> 4845 * <p> 4846 * If an {@link AccessibilityDelegate} has been specified via calling 4847 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4848 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4849 * is responsible for handling this call. 4850 * </p> 4851 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4852 * information to the event, in case the default implementation has basic information to add. 4853 * </p> 4854 * @param event The event to initialize. 4855 * 4856 * @see #sendAccessibilityEvent(int) 4857 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4858 */ 4859 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4860 if (mAccessibilityDelegate != null) { 4861 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4862 } else { 4863 onInitializeAccessibilityEventInternal(event); 4864 } 4865 } 4866 4867 /** 4868 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4869 * 4870 * Note: Called from the default {@link AccessibilityDelegate}. 4871 */ 4872 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4873 event.setSource(this); 4874 event.setClassName(View.class.getName()); 4875 event.setPackageName(getContext().getPackageName()); 4876 event.setEnabled(isEnabled()); 4877 event.setContentDescription(mContentDescription); 4878 4879 switch (event.getEventType()) { 4880 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 4881 ArrayList<View> focusablesTempList = (mAttachInfo != null) 4882 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 4883 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 4884 event.setItemCount(focusablesTempList.size()); 4885 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4886 if (mAttachInfo != null) { 4887 focusablesTempList.clear(); 4888 } 4889 } break; 4890 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 4891 CharSequence text = getIterableTextForAccessibility(); 4892 if (text != null && text.length() > 0) { 4893 event.setFromIndex(getAccessibilitySelectionStart()); 4894 event.setToIndex(getAccessibilitySelectionEnd()); 4895 event.setItemCount(text.length()); 4896 } 4897 } break; 4898 } 4899 } 4900 4901 /** 4902 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4903 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4904 * This method is responsible for obtaining an accessibility node info from a 4905 * pool of reusable instances and calling 4906 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4907 * initialize the former. 4908 * <p> 4909 * Note: The client is responsible for recycling the obtained instance by calling 4910 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4911 * </p> 4912 * 4913 * @return A populated {@link AccessibilityNodeInfo}. 4914 * 4915 * @see AccessibilityNodeInfo 4916 */ 4917 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4918 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4919 if (provider != null) { 4920 return provider.createAccessibilityNodeInfo(View.NO_ID); 4921 } else { 4922 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4923 onInitializeAccessibilityNodeInfo(info); 4924 return info; 4925 } 4926 } 4927 4928 /** 4929 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4930 * The base implementation sets: 4931 * <ul> 4932 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4933 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4934 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4935 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4936 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4937 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4938 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4939 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4940 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4941 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4942 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4943 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4944 * </ul> 4945 * <p> 4946 * Subclasses should override this method, call the super implementation, 4947 * and set additional attributes. 4948 * </p> 4949 * <p> 4950 * If an {@link AccessibilityDelegate} has been specified via calling 4951 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4952 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4953 * is responsible for handling this call. 4954 * </p> 4955 * 4956 * @param info The instance to initialize. 4957 */ 4958 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4959 if (mAccessibilityDelegate != null) { 4960 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4961 } else { 4962 onInitializeAccessibilityNodeInfoInternal(info); 4963 } 4964 } 4965 4966 /** 4967 * Gets the location of this view in screen coordintates. 4968 * 4969 * @param outRect The output location 4970 */ 4971 void getBoundsOnScreen(Rect outRect) { 4972 if (mAttachInfo == null) { 4973 return; 4974 } 4975 4976 RectF position = mAttachInfo.mTmpTransformRect; 4977 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4978 4979 if (!hasIdentityMatrix()) { 4980 getMatrix().mapRect(position); 4981 } 4982 4983 position.offset(mLeft, mTop); 4984 4985 ViewParent parent = mParent; 4986 while (parent instanceof View) { 4987 View parentView = (View) parent; 4988 4989 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4990 4991 if (!parentView.hasIdentityMatrix()) { 4992 parentView.getMatrix().mapRect(position); 4993 } 4994 4995 position.offset(parentView.mLeft, parentView.mTop); 4996 4997 parent = parentView.mParent; 4998 } 4999 5000 if (parent instanceof ViewRootImpl) { 5001 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5002 position.offset(0, -viewRootImpl.mCurScrollY); 5003 } 5004 5005 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5006 5007 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5008 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5009 } 5010 5011 /** 5012 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5013 * 5014 * Note: Called from the default {@link AccessibilityDelegate}. 5015 */ 5016 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5017 Rect bounds = mAttachInfo.mTmpInvalRect; 5018 5019 getDrawingRect(bounds); 5020 info.setBoundsInParent(bounds); 5021 5022 getBoundsOnScreen(bounds); 5023 info.setBoundsInScreen(bounds); 5024 5025 ViewParent parent = getParentForAccessibility(); 5026 if (parent instanceof View) { 5027 info.setParent((View) parent); 5028 } 5029 5030 if (mID != View.NO_ID) { 5031 View rootView = getRootView(); 5032 if (rootView == null) { 5033 rootView = this; 5034 } 5035 View label = rootView.findLabelForView(this, mID); 5036 if (label != null) { 5037 info.setLabeledBy(label); 5038 } 5039 5040 if ((mAttachInfo.mAccessibilityFetchFlags 5041 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0) { 5042 try { 5043 String viewId = getResources().getResourceName(mID); 5044 info.setViewIdResourceName(viewId); 5045 } catch (Resources.NotFoundException nfe) { 5046 /* ignore */ 5047 } 5048 } 5049 } 5050 5051 if (mLabelForId != View.NO_ID) { 5052 View rootView = getRootView(); 5053 if (rootView == null) { 5054 rootView = this; 5055 } 5056 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5057 if (labeled != null) { 5058 info.setLabelFor(labeled); 5059 } 5060 } 5061 5062 info.setVisibleToUser(isVisibleToUser()); 5063 5064 info.setPackageName(mContext.getPackageName()); 5065 info.setClassName(View.class.getName()); 5066 info.setContentDescription(getContentDescription()); 5067 5068 info.setEnabled(isEnabled()); 5069 info.setClickable(isClickable()); 5070 info.setFocusable(isFocusable()); 5071 info.setFocused(isFocused()); 5072 info.setAccessibilityFocused(isAccessibilityFocused()); 5073 info.setSelected(isSelected()); 5074 info.setLongClickable(isLongClickable()); 5075 5076 // TODO: These make sense only if we are in an AdapterView but all 5077 // views can be selected. Maybe from accessibility perspective 5078 // we should report as selectable view in an AdapterView. 5079 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5080 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5081 5082 if (isFocusable()) { 5083 if (isFocused()) { 5084 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5085 } else { 5086 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5087 } 5088 } 5089 5090 if (!isAccessibilityFocused()) { 5091 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5092 } else { 5093 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5094 } 5095 5096 if (isClickable() && isEnabled()) { 5097 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5098 } 5099 5100 if (isLongClickable() && isEnabled()) { 5101 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5102 } 5103 5104 CharSequence text = getIterableTextForAccessibility(); 5105 if (text != null && text.length() > 0) { 5106 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5107 5108 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5109 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5110 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5111 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5112 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5113 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5114 } 5115 } 5116 5117 private View findLabelForView(View view, int labeledId) { 5118 if (mMatchLabelForPredicate == null) { 5119 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5120 } 5121 mMatchLabelForPredicate.mLabeledId = labeledId; 5122 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5123 } 5124 5125 /** 5126 * Computes whether this view is visible to the user. Such a view is 5127 * attached, visible, all its predecessors are visible, it is not clipped 5128 * entirely by its predecessors, and has an alpha greater than zero. 5129 * 5130 * @return Whether the view is visible on the screen. 5131 * 5132 * @hide 5133 */ 5134 protected boolean isVisibleToUser() { 5135 return isVisibleToUser(null); 5136 } 5137 5138 /** 5139 * Computes whether the given portion of this view is visible to the user. 5140 * Such a view is attached, visible, all its predecessors are visible, 5141 * has an alpha greater than zero, and the specified portion is not 5142 * clipped entirely by its predecessors. 5143 * 5144 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5145 * <code>null</code>, and the entire view will be tested in this case. 5146 * When <code>true</code> is returned by the function, the actual visible 5147 * region will be stored in this parameter; that is, if boundInView is fully 5148 * contained within the view, no modification will be made, otherwise regions 5149 * outside of the visible area of the view will be clipped. 5150 * 5151 * @return Whether the specified portion of the view is visible on the screen. 5152 * 5153 * @hide 5154 */ 5155 protected boolean isVisibleToUser(Rect boundInView) { 5156 if (mAttachInfo != null) { 5157 // Attached to invisible window means this view is not visible. 5158 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5159 return false; 5160 } 5161 // An invisible predecessor or one with alpha zero means 5162 // that this view is not visible to the user. 5163 Object current = this; 5164 while (current instanceof View) { 5165 View view = (View) current; 5166 // We have attach info so this view is attached and there is no 5167 // need to check whether we reach to ViewRootImpl on the way up. 5168 if (view.getAlpha() <= 0 || view.getVisibility() != VISIBLE) { 5169 return false; 5170 } 5171 current = view.mParent; 5172 } 5173 // Check if the view is entirely covered by its predecessors. 5174 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5175 Point offset = mAttachInfo.mPoint; 5176 if (!getGlobalVisibleRect(visibleRect, offset)) { 5177 return false; 5178 } 5179 // Check if the visible portion intersects the rectangle of interest. 5180 if (boundInView != null) { 5181 visibleRect.offset(-offset.x, -offset.y); 5182 return boundInView.intersect(visibleRect); 5183 } 5184 return true; 5185 } 5186 return false; 5187 } 5188 5189 /** 5190 * Returns the delegate for implementing accessibility support via 5191 * composition. For more details see {@link AccessibilityDelegate}. 5192 * 5193 * @return The delegate, or null if none set. 5194 * 5195 * @hide 5196 */ 5197 public AccessibilityDelegate getAccessibilityDelegate() { 5198 return mAccessibilityDelegate; 5199 } 5200 5201 /** 5202 * Sets a delegate for implementing accessibility support via composition as 5203 * opposed to inheritance. The delegate's primary use is for implementing 5204 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5205 * 5206 * @param delegate The delegate instance. 5207 * 5208 * @see AccessibilityDelegate 5209 */ 5210 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5211 mAccessibilityDelegate = delegate; 5212 } 5213 5214 /** 5215 * Gets the provider for managing a virtual view hierarchy rooted at this View 5216 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5217 * that explore the window content. 5218 * <p> 5219 * If this method returns an instance, this instance is responsible for managing 5220 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5221 * View including the one representing the View itself. Similarly the returned 5222 * instance is responsible for performing accessibility actions on any virtual 5223 * view or the root view itself. 5224 * </p> 5225 * <p> 5226 * If an {@link AccessibilityDelegate} has been specified via calling 5227 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5228 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5229 * is responsible for handling this call. 5230 * </p> 5231 * 5232 * @return The provider. 5233 * 5234 * @see AccessibilityNodeProvider 5235 */ 5236 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5237 if (mAccessibilityDelegate != null) { 5238 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5239 } else { 5240 return null; 5241 } 5242 } 5243 5244 /** 5245 * Gets the unique identifier of this view on the screen for accessibility purposes. 5246 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5247 * 5248 * @return The view accessibility id. 5249 * 5250 * @hide 5251 */ 5252 public int getAccessibilityViewId() { 5253 if (mAccessibilityViewId == NO_ID) { 5254 mAccessibilityViewId = sNextAccessibilityViewId++; 5255 } 5256 return mAccessibilityViewId; 5257 } 5258 5259 /** 5260 * Gets the unique identifier of the window in which this View reseides. 5261 * 5262 * @return The window accessibility id. 5263 * 5264 * @hide 5265 */ 5266 public int getAccessibilityWindowId() { 5267 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5268 } 5269 5270 /** 5271 * Gets the {@link View} description. It briefly describes the view and is 5272 * primarily used for accessibility support. Set this property to enable 5273 * better accessibility support for your application. This is especially 5274 * true for views that do not have textual representation (For example, 5275 * ImageButton). 5276 * 5277 * @return The content description. 5278 * 5279 * @attr ref android.R.styleable#View_contentDescription 5280 */ 5281 @ViewDebug.ExportedProperty(category = "accessibility") 5282 public CharSequence getContentDescription() { 5283 return mContentDescription; 5284 } 5285 5286 /** 5287 * Sets the {@link View} description. It briefly describes the view and is 5288 * primarily used for accessibility support. Set this property to enable 5289 * better accessibility support for your application. This is especially 5290 * true for views that do not have textual representation (For example, 5291 * ImageButton). 5292 * 5293 * @param contentDescription The content description. 5294 * 5295 * @attr ref android.R.styleable#View_contentDescription 5296 */ 5297 @RemotableViewMethod 5298 public void setContentDescription(CharSequence contentDescription) { 5299 if (mContentDescription == null) { 5300 if (contentDescription == null) { 5301 return; 5302 } 5303 } else if (mContentDescription.equals(contentDescription)) { 5304 return; 5305 } 5306 mContentDescription = contentDescription; 5307 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5308 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5309 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5310 } 5311 notifyAccessibilityStateChanged(); 5312 } 5313 5314 /** 5315 * Gets the id of a view for which this view serves as a label for 5316 * accessibility purposes. 5317 * 5318 * @return The labeled view id. 5319 */ 5320 @ViewDebug.ExportedProperty(category = "accessibility") 5321 public int getLabelFor() { 5322 return mLabelForId; 5323 } 5324 5325 /** 5326 * Sets the id of a view for which this view serves as a label for 5327 * accessibility purposes. 5328 * 5329 * @param id The labeled view id. 5330 */ 5331 @RemotableViewMethod 5332 public void setLabelFor(int id) { 5333 mLabelForId = id; 5334 if (mLabelForId != View.NO_ID 5335 && mID == View.NO_ID) { 5336 mID = generateViewId(); 5337 } 5338 } 5339 5340 /** 5341 * Invoked whenever this view loses focus, either by losing window focus or by losing 5342 * focus within its window. This method can be used to clear any state tied to the 5343 * focus. For instance, if a button is held pressed with the trackball and the window 5344 * loses focus, this method can be used to cancel the press. 5345 * 5346 * Subclasses of View overriding this method should always call super.onFocusLost(). 5347 * 5348 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5349 * @see #onWindowFocusChanged(boolean) 5350 * 5351 * @hide pending API council approval 5352 */ 5353 protected void onFocusLost() { 5354 resetPressedState(); 5355 } 5356 5357 private void resetPressedState() { 5358 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5359 return; 5360 } 5361 5362 if (isPressed()) { 5363 setPressed(false); 5364 5365 if (!mHasPerformedLongPress) { 5366 removeLongPressCallback(); 5367 } 5368 } 5369 } 5370 5371 /** 5372 * Returns true if this view has focus 5373 * 5374 * @return True if this view has focus, false otherwise. 5375 */ 5376 @ViewDebug.ExportedProperty(category = "focus") 5377 public boolean isFocused() { 5378 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5379 } 5380 5381 /** 5382 * Find the view in the hierarchy rooted at this view that currently has 5383 * focus. 5384 * 5385 * @return The view that currently has focus, or null if no focused view can 5386 * be found. 5387 */ 5388 public View findFocus() { 5389 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5390 } 5391 5392 /** 5393 * Indicates whether this view is one of the set of scrollable containers in 5394 * its window. 5395 * 5396 * @return whether this view is one of the set of scrollable containers in 5397 * its window 5398 * 5399 * @attr ref android.R.styleable#View_isScrollContainer 5400 */ 5401 public boolean isScrollContainer() { 5402 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5403 } 5404 5405 /** 5406 * Change whether this view is one of the set of scrollable containers in 5407 * its window. This will be used to determine whether the window can 5408 * resize or must pan when a soft input area is open -- scrollable 5409 * containers allow the window to use resize mode since the container 5410 * will appropriately shrink. 5411 * 5412 * @attr ref android.R.styleable#View_isScrollContainer 5413 */ 5414 public void setScrollContainer(boolean isScrollContainer) { 5415 if (isScrollContainer) { 5416 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5417 mAttachInfo.mScrollContainers.add(this); 5418 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5419 } 5420 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5421 } else { 5422 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5423 mAttachInfo.mScrollContainers.remove(this); 5424 } 5425 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5426 } 5427 } 5428 5429 /** 5430 * Returns the quality of the drawing cache. 5431 * 5432 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5433 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5434 * 5435 * @see #setDrawingCacheQuality(int) 5436 * @see #setDrawingCacheEnabled(boolean) 5437 * @see #isDrawingCacheEnabled() 5438 * 5439 * @attr ref android.R.styleable#View_drawingCacheQuality 5440 */ 5441 public int getDrawingCacheQuality() { 5442 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5443 } 5444 5445 /** 5446 * Set the drawing cache quality of this view. This value is used only when the 5447 * drawing cache is enabled 5448 * 5449 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5450 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5451 * 5452 * @see #getDrawingCacheQuality() 5453 * @see #setDrawingCacheEnabled(boolean) 5454 * @see #isDrawingCacheEnabled() 5455 * 5456 * @attr ref android.R.styleable#View_drawingCacheQuality 5457 */ 5458 public void setDrawingCacheQuality(int quality) { 5459 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5460 } 5461 5462 /** 5463 * Returns whether the screen should remain on, corresponding to the current 5464 * value of {@link #KEEP_SCREEN_ON}. 5465 * 5466 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5467 * 5468 * @see #setKeepScreenOn(boolean) 5469 * 5470 * @attr ref android.R.styleable#View_keepScreenOn 5471 */ 5472 public boolean getKeepScreenOn() { 5473 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5474 } 5475 5476 /** 5477 * Controls whether the screen should remain on, modifying the 5478 * value of {@link #KEEP_SCREEN_ON}. 5479 * 5480 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5481 * 5482 * @see #getKeepScreenOn() 5483 * 5484 * @attr ref android.R.styleable#View_keepScreenOn 5485 */ 5486 public void setKeepScreenOn(boolean keepScreenOn) { 5487 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5488 } 5489 5490 /** 5491 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5492 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5493 * 5494 * @attr ref android.R.styleable#View_nextFocusLeft 5495 */ 5496 public int getNextFocusLeftId() { 5497 return mNextFocusLeftId; 5498 } 5499 5500 /** 5501 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5502 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5503 * decide automatically. 5504 * 5505 * @attr ref android.R.styleable#View_nextFocusLeft 5506 */ 5507 public void setNextFocusLeftId(int nextFocusLeftId) { 5508 mNextFocusLeftId = nextFocusLeftId; 5509 } 5510 5511 /** 5512 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5513 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5514 * 5515 * @attr ref android.R.styleable#View_nextFocusRight 5516 */ 5517 public int getNextFocusRightId() { 5518 return mNextFocusRightId; 5519 } 5520 5521 /** 5522 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5523 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5524 * decide automatically. 5525 * 5526 * @attr ref android.R.styleable#View_nextFocusRight 5527 */ 5528 public void setNextFocusRightId(int nextFocusRightId) { 5529 mNextFocusRightId = nextFocusRightId; 5530 } 5531 5532 /** 5533 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5534 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5535 * 5536 * @attr ref android.R.styleable#View_nextFocusUp 5537 */ 5538 public int getNextFocusUpId() { 5539 return mNextFocusUpId; 5540 } 5541 5542 /** 5543 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5544 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5545 * decide automatically. 5546 * 5547 * @attr ref android.R.styleable#View_nextFocusUp 5548 */ 5549 public void setNextFocusUpId(int nextFocusUpId) { 5550 mNextFocusUpId = nextFocusUpId; 5551 } 5552 5553 /** 5554 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5555 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5556 * 5557 * @attr ref android.R.styleable#View_nextFocusDown 5558 */ 5559 public int getNextFocusDownId() { 5560 return mNextFocusDownId; 5561 } 5562 5563 /** 5564 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5565 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5566 * decide automatically. 5567 * 5568 * @attr ref android.R.styleable#View_nextFocusDown 5569 */ 5570 public void setNextFocusDownId(int nextFocusDownId) { 5571 mNextFocusDownId = nextFocusDownId; 5572 } 5573 5574 /** 5575 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5576 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5577 * 5578 * @attr ref android.R.styleable#View_nextFocusForward 5579 */ 5580 public int getNextFocusForwardId() { 5581 return mNextFocusForwardId; 5582 } 5583 5584 /** 5585 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5586 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5587 * decide automatically. 5588 * 5589 * @attr ref android.R.styleable#View_nextFocusForward 5590 */ 5591 public void setNextFocusForwardId(int nextFocusForwardId) { 5592 mNextFocusForwardId = nextFocusForwardId; 5593 } 5594 5595 /** 5596 * Returns the visibility of this view and all of its ancestors 5597 * 5598 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5599 */ 5600 public boolean isShown() { 5601 View current = this; 5602 //noinspection ConstantConditions 5603 do { 5604 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5605 return false; 5606 } 5607 ViewParent parent = current.mParent; 5608 if (parent == null) { 5609 return false; // We are not attached to the view root 5610 } 5611 if (!(parent instanceof View)) { 5612 return true; 5613 } 5614 current = (View) parent; 5615 } while (current != null); 5616 5617 return false; 5618 } 5619 5620 /** 5621 * Called by the view hierarchy when the content insets for a window have 5622 * changed, to allow it to adjust its content to fit within those windows. 5623 * The content insets tell you the space that the status bar, input method, 5624 * and other system windows infringe on the application's window. 5625 * 5626 * <p>You do not normally need to deal with this function, since the default 5627 * window decoration given to applications takes care of applying it to the 5628 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5629 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5630 * and your content can be placed under those system elements. You can then 5631 * use this method within your view hierarchy if you have parts of your UI 5632 * which you would like to ensure are not being covered. 5633 * 5634 * <p>The default implementation of this method simply applies the content 5635 * inset's to the view's padding, consuming that content (modifying the 5636 * insets to be 0), and returning true. This behavior is off by default, but can 5637 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5638 * 5639 * <p>This function's traversal down the hierarchy is depth-first. The same content 5640 * insets object is propagated down the hierarchy, so any changes made to it will 5641 * be seen by all following views (including potentially ones above in 5642 * the hierarchy since this is a depth-first traversal). The first view 5643 * that returns true will abort the entire traversal. 5644 * 5645 * <p>The default implementation works well for a situation where it is 5646 * used with a container that covers the entire window, allowing it to 5647 * apply the appropriate insets to its content on all edges. If you need 5648 * a more complicated layout (such as two different views fitting system 5649 * windows, one on the top of the window, and one on the bottom), 5650 * you can override the method and handle the insets however you would like. 5651 * Note that the insets provided by the framework are always relative to the 5652 * far edges of the window, not accounting for the location of the called view 5653 * within that window. (In fact when this method is called you do not yet know 5654 * where the layout will place the view, as it is done before layout happens.) 5655 * 5656 * <p>Note: unlike many View methods, there is no dispatch phase to this 5657 * call. If you are overriding it in a ViewGroup and want to allow the 5658 * call to continue to your children, you must be sure to call the super 5659 * implementation. 5660 * 5661 * <p>Here is a sample layout that makes use of fitting system windows 5662 * to have controls for a video view placed inside of the window decorations 5663 * that it hides and shows. This can be used with code like the second 5664 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5665 * 5666 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5667 * 5668 * @param insets Current content insets of the window. Prior to 5669 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5670 * the insets or else you and Android will be unhappy. 5671 * 5672 * @return Return true if this view applied the insets and it should not 5673 * continue propagating further down the hierarchy, false otherwise. 5674 * @see #getFitsSystemWindows() 5675 * @see #setFitsSystemWindows(boolean) 5676 * @see #setSystemUiVisibility(int) 5677 */ 5678 protected boolean fitSystemWindows(Rect insets) { 5679 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5680 mUserPaddingStart = UNDEFINED_PADDING; 5681 mUserPaddingEnd = UNDEFINED_PADDING; 5682 Rect localInsets = sThreadLocal.get(); 5683 if (localInsets == null) { 5684 localInsets = new Rect(); 5685 sThreadLocal.set(localInsets); 5686 } 5687 boolean res = computeFitSystemWindows(insets, localInsets); 5688 internalSetPadding(localInsets.left, localInsets.top, 5689 localInsets.right, localInsets.bottom); 5690 return res; 5691 } 5692 return false; 5693 } 5694 5695 /** 5696 * @hide Compute the insets that should be consumed by this view and the ones 5697 * that should propagate to those under it. 5698 */ 5699 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 5700 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5701 || mAttachInfo == null 5702 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 5703 && !mAttachInfo.mOverscanRequested)) { 5704 outLocalInsets.set(inoutInsets); 5705 inoutInsets.set(0, 0, 0, 0); 5706 return true; 5707 } else { 5708 // The application wants to take care of fitting system window for 5709 // the content... however we still need to take care of any overscan here. 5710 final Rect overscan = mAttachInfo.mOverscanInsets; 5711 outLocalInsets.set(overscan); 5712 inoutInsets.left -= overscan.left; 5713 inoutInsets.top -= overscan.top; 5714 inoutInsets.right -= overscan.right; 5715 inoutInsets.bottom -= overscan.bottom; 5716 return false; 5717 } 5718 } 5719 5720 /** 5721 * Sets whether or not this view should account for system screen decorations 5722 * such as the status bar and inset its content; that is, controlling whether 5723 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5724 * executed. See that method for more details. 5725 * 5726 * <p>Note that if you are providing your own implementation of 5727 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5728 * flag to true -- your implementation will be overriding the default 5729 * implementation that checks this flag. 5730 * 5731 * @param fitSystemWindows If true, then the default implementation of 5732 * {@link #fitSystemWindows(Rect)} will be executed. 5733 * 5734 * @attr ref android.R.styleable#View_fitsSystemWindows 5735 * @see #getFitsSystemWindows() 5736 * @see #fitSystemWindows(Rect) 5737 * @see #setSystemUiVisibility(int) 5738 */ 5739 public void setFitsSystemWindows(boolean fitSystemWindows) { 5740 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5741 } 5742 5743 /** 5744 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5745 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5746 * will be executed. 5747 * 5748 * @return Returns true if the default implementation of 5749 * {@link #fitSystemWindows(Rect)} will be executed. 5750 * 5751 * @attr ref android.R.styleable#View_fitsSystemWindows 5752 * @see #setFitsSystemWindows() 5753 * @see #fitSystemWindows(Rect) 5754 * @see #setSystemUiVisibility(int) 5755 */ 5756 public boolean getFitsSystemWindows() { 5757 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5758 } 5759 5760 /** @hide */ 5761 public boolean fitsSystemWindows() { 5762 return getFitsSystemWindows(); 5763 } 5764 5765 /** 5766 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5767 */ 5768 public void requestFitSystemWindows() { 5769 if (mParent != null) { 5770 mParent.requestFitSystemWindows(); 5771 } 5772 } 5773 5774 /** 5775 * For use by PhoneWindow to make its own system window fitting optional. 5776 * @hide 5777 */ 5778 public void makeOptionalFitsSystemWindows() { 5779 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5780 } 5781 5782 /** 5783 * Returns the visibility status for this view. 5784 * 5785 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5786 * @attr ref android.R.styleable#View_visibility 5787 */ 5788 @ViewDebug.ExportedProperty(mapping = { 5789 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5790 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5791 @ViewDebug.IntToString(from = GONE, to = "GONE") 5792 }) 5793 public int getVisibility() { 5794 return mViewFlags & VISIBILITY_MASK; 5795 } 5796 5797 /** 5798 * Set the enabled state of this view. 5799 * 5800 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5801 * @attr ref android.R.styleable#View_visibility 5802 */ 5803 @RemotableViewMethod 5804 public void setVisibility(int visibility) { 5805 setFlags(visibility, VISIBILITY_MASK); 5806 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5807 } 5808 5809 /** 5810 * Returns the enabled status for this view. The interpretation of the 5811 * enabled state varies by subclass. 5812 * 5813 * @return True if this view is enabled, false otherwise. 5814 */ 5815 @ViewDebug.ExportedProperty 5816 public boolean isEnabled() { 5817 return (mViewFlags & ENABLED_MASK) == ENABLED; 5818 } 5819 5820 /** 5821 * Set the enabled state of this view. The interpretation of the enabled 5822 * state varies by subclass. 5823 * 5824 * @param enabled True if this view is enabled, false otherwise. 5825 */ 5826 @RemotableViewMethod 5827 public void setEnabled(boolean enabled) { 5828 if (enabled == isEnabled()) return; 5829 5830 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5831 5832 /* 5833 * The View most likely has to change its appearance, so refresh 5834 * the drawable state. 5835 */ 5836 refreshDrawableState(); 5837 5838 // Invalidate too, since the default behavior for views is to be 5839 // be drawn at 50% alpha rather than to change the drawable. 5840 invalidate(true); 5841 } 5842 5843 /** 5844 * Set whether this view can receive the focus. 5845 * 5846 * Setting this to false will also ensure that this view is not focusable 5847 * in touch mode. 5848 * 5849 * @param focusable If true, this view can receive the focus. 5850 * 5851 * @see #setFocusableInTouchMode(boolean) 5852 * @attr ref android.R.styleable#View_focusable 5853 */ 5854 public void setFocusable(boolean focusable) { 5855 if (!focusable) { 5856 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5857 } 5858 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5859 } 5860 5861 /** 5862 * Set whether this view can receive focus while in touch mode. 5863 * 5864 * Setting this to true will also ensure that this view is focusable. 5865 * 5866 * @param focusableInTouchMode If true, this view can receive the focus while 5867 * in touch mode. 5868 * 5869 * @see #setFocusable(boolean) 5870 * @attr ref android.R.styleable#View_focusableInTouchMode 5871 */ 5872 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5873 // Focusable in touch mode should always be set before the focusable flag 5874 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5875 // which, in touch mode, will not successfully request focus on this view 5876 // because the focusable in touch mode flag is not set 5877 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5878 if (focusableInTouchMode) { 5879 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5880 } 5881 } 5882 5883 /** 5884 * Set whether this view should have sound effects enabled for events such as 5885 * clicking and touching. 5886 * 5887 * <p>You may wish to disable sound effects for a view if you already play sounds, 5888 * for instance, a dial key that plays dtmf tones. 5889 * 5890 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5891 * @see #isSoundEffectsEnabled() 5892 * @see #playSoundEffect(int) 5893 * @attr ref android.R.styleable#View_soundEffectsEnabled 5894 */ 5895 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5896 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5897 } 5898 5899 /** 5900 * @return whether this view should have sound effects enabled for events such as 5901 * clicking and touching. 5902 * 5903 * @see #setSoundEffectsEnabled(boolean) 5904 * @see #playSoundEffect(int) 5905 * @attr ref android.R.styleable#View_soundEffectsEnabled 5906 */ 5907 @ViewDebug.ExportedProperty 5908 public boolean isSoundEffectsEnabled() { 5909 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5910 } 5911 5912 /** 5913 * Set whether this view should have haptic feedback for events such as 5914 * long presses. 5915 * 5916 * <p>You may wish to disable haptic feedback if your view already controls 5917 * its own haptic feedback. 5918 * 5919 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5920 * @see #isHapticFeedbackEnabled() 5921 * @see #performHapticFeedback(int) 5922 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5923 */ 5924 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5925 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5926 } 5927 5928 /** 5929 * @return whether this view should have haptic feedback enabled for events 5930 * long presses. 5931 * 5932 * @see #setHapticFeedbackEnabled(boolean) 5933 * @see #performHapticFeedback(int) 5934 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5935 */ 5936 @ViewDebug.ExportedProperty 5937 public boolean isHapticFeedbackEnabled() { 5938 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5939 } 5940 5941 /** 5942 * Returns the layout direction for this view. 5943 * 5944 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5945 * {@link #LAYOUT_DIRECTION_RTL}, 5946 * {@link #LAYOUT_DIRECTION_INHERIT} or 5947 * {@link #LAYOUT_DIRECTION_LOCALE}. 5948 * 5949 * @attr ref android.R.styleable#View_layoutDirection 5950 * 5951 * @hide 5952 */ 5953 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5954 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5955 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5956 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5957 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5958 }) 5959 public int getRawLayoutDirection() { 5960 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 5961 } 5962 5963 /** 5964 * Set the layout direction for this view. This will propagate a reset of layout direction 5965 * resolution to the view's children and resolve layout direction for this view. 5966 * 5967 * @param layoutDirection the layout direction to set. Should be one of: 5968 * 5969 * {@link #LAYOUT_DIRECTION_LTR}, 5970 * {@link #LAYOUT_DIRECTION_RTL}, 5971 * {@link #LAYOUT_DIRECTION_INHERIT}, 5972 * {@link #LAYOUT_DIRECTION_LOCALE}. 5973 * 5974 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 5975 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 5976 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 5977 * 5978 * @attr ref android.R.styleable#View_layoutDirection 5979 */ 5980 @RemotableViewMethod 5981 public void setLayoutDirection(int layoutDirection) { 5982 if (getRawLayoutDirection() != layoutDirection) { 5983 // Reset the current layout direction and the resolved one 5984 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 5985 resetRtlProperties(); 5986 // Set the new layout direction (filtered) 5987 mPrivateFlags2 |= 5988 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 5989 // We need to resolve all RTL properties as they all depend on layout direction 5990 resolveRtlPropertiesIfNeeded(); 5991 requestLayout(); 5992 invalidate(true); 5993 } 5994 } 5995 5996 /** 5997 * Returns the resolved layout direction for this view. 5998 * 5999 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6000 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6001 * 6002 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6003 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6004 * 6005 * @attr ref android.R.styleable#View_layoutDirection 6006 */ 6007 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6008 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6009 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6010 }) 6011 public int getLayoutDirection() { 6012 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6013 if (targetSdkVersion < JELLY_BEAN_MR1) { 6014 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6015 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6016 } 6017 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6018 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6019 } 6020 6021 /** 6022 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6023 * layout attribute and/or the inherited value from the parent 6024 * 6025 * @return true if the layout is right-to-left. 6026 * 6027 * @hide 6028 */ 6029 @ViewDebug.ExportedProperty(category = "layout") 6030 public boolean isLayoutRtl() { 6031 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6032 } 6033 6034 /** 6035 * Indicates whether the view is currently tracking transient state that the 6036 * app should not need to concern itself with saving and restoring, but that 6037 * the framework should take special note to preserve when possible. 6038 * 6039 * <p>A view with transient state cannot be trivially rebound from an external 6040 * data source, such as an adapter binding item views in a list. This may be 6041 * because the view is performing an animation, tracking user selection 6042 * of content, or similar.</p> 6043 * 6044 * @return true if the view has transient state 6045 */ 6046 @ViewDebug.ExportedProperty(category = "layout") 6047 public boolean hasTransientState() { 6048 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6049 } 6050 6051 /** 6052 * Set whether this view is currently tracking transient state that the 6053 * framework should attempt to preserve when possible. This flag is reference counted, 6054 * so every call to setHasTransientState(true) should be paired with a later call 6055 * to setHasTransientState(false). 6056 * 6057 * <p>A view with transient state cannot be trivially rebound from an external 6058 * data source, such as an adapter binding item views in a list. This may be 6059 * because the view is performing an animation, tracking user selection 6060 * of content, or similar.</p> 6061 * 6062 * @param hasTransientState true if this view has transient state 6063 */ 6064 public void setHasTransientState(boolean hasTransientState) { 6065 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6066 mTransientStateCount - 1; 6067 if (mTransientStateCount < 0) { 6068 mTransientStateCount = 0; 6069 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6070 "unmatched pair of setHasTransientState calls"); 6071 } 6072 if ((hasTransientState && mTransientStateCount == 1) || 6073 (!hasTransientState && mTransientStateCount == 0)) { 6074 // update flag if we've just incremented up from 0 or decremented down to 0 6075 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6076 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6077 if (mParent != null) { 6078 try { 6079 mParent.childHasTransientStateChanged(this, hasTransientState); 6080 } catch (AbstractMethodError e) { 6081 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6082 " does not fully implement ViewParent", e); 6083 } 6084 } 6085 } 6086 } 6087 6088 /** 6089 * If this view doesn't do any drawing on its own, set this flag to 6090 * allow further optimizations. By default, this flag is not set on 6091 * View, but could be set on some View subclasses such as ViewGroup. 6092 * 6093 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6094 * you should clear this flag. 6095 * 6096 * @param willNotDraw whether or not this View draw on its own 6097 */ 6098 public void setWillNotDraw(boolean willNotDraw) { 6099 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6100 } 6101 6102 /** 6103 * Returns whether or not this View draws on its own. 6104 * 6105 * @return true if this view has nothing to draw, false otherwise 6106 */ 6107 @ViewDebug.ExportedProperty(category = "drawing") 6108 public boolean willNotDraw() { 6109 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 6110 } 6111 6112 /** 6113 * When a View's drawing cache is enabled, drawing is redirected to an 6114 * offscreen bitmap. Some views, like an ImageView, must be able to 6115 * bypass this mechanism if they already draw a single bitmap, to avoid 6116 * unnecessary usage of the memory. 6117 * 6118 * @param willNotCacheDrawing true if this view does not cache its 6119 * drawing, false otherwise 6120 */ 6121 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6122 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6123 } 6124 6125 /** 6126 * Returns whether or not this View can cache its drawing or not. 6127 * 6128 * @return true if this view does not cache its drawing, false otherwise 6129 */ 6130 @ViewDebug.ExportedProperty(category = "drawing") 6131 public boolean willNotCacheDrawing() { 6132 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6133 } 6134 6135 /** 6136 * Indicates whether this view reacts to click events or not. 6137 * 6138 * @return true if the view is clickable, false otherwise 6139 * 6140 * @see #setClickable(boolean) 6141 * @attr ref android.R.styleable#View_clickable 6142 */ 6143 @ViewDebug.ExportedProperty 6144 public boolean isClickable() { 6145 return (mViewFlags & CLICKABLE) == CLICKABLE; 6146 } 6147 6148 /** 6149 * Enables or disables click events for this view. When a view 6150 * is clickable it will change its state to "pressed" on every click. 6151 * Subclasses should set the view clickable to visually react to 6152 * user's clicks. 6153 * 6154 * @param clickable true to make the view clickable, false otherwise 6155 * 6156 * @see #isClickable() 6157 * @attr ref android.R.styleable#View_clickable 6158 */ 6159 public void setClickable(boolean clickable) { 6160 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6161 } 6162 6163 /** 6164 * Indicates whether this view reacts to long click events or not. 6165 * 6166 * @return true if the view is long clickable, false otherwise 6167 * 6168 * @see #setLongClickable(boolean) 6169 * @attr ref android.R.styleable#View_longClickable 6170 */ 6171 public boolean isLongClickable() { 6172 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6173 } 6174 6175 /** 6176 * Enables or disables long click events for this view. When a view is long 6177 * clickable it reacts to the user holding down the button for a longer 6178 * duration than a tap. This event can either launch the listener or a 6179 * context menu. 6180 * 6181 * @param longClickable true to make the view long clickable, false otherwise 6182 * @see #isLongClickable() 6183 * @attr ref android.R.styleable#View_longClickable 6184 */ 6185 public void setLongClickable(boolean longClickable) { 6186 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6187 } 6188 6189 /** 6190 * Sets the pressed state for this view. 6191 * 6192 * @see #isClickable() 6193 * @see #setClickable(boolean) 6194 * 6195 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6196 * the View's internal state from a previously set "pressed" state. 6197 */ 6198 public void setPressed(boolean pressed) { 6199 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6200 6201 if (pressed) { 6202 mPrivateFlags |= PFLAG_PRESSED; 6203 } else { 6204 mPrivateFlags &= ~PFLAG_PRESSED; 6205 } 6206 6207 if (needsRefresh) { 6208 refreshDrawableState(); 6209 } 6210 dispatchSetPressed(pressed); 6211 } 6212 6213 /** 6214 * Dispatch setPressed to all of this View's children. 6215 * 6216 * @see #setPressed(boolean) 6217 * 6218 * @param pressed The new pressed state 6219 */ 6220 protected void dispatchSetPressed(boolean pressed) { 6221 } 6222 6223 /** 6224 * Indicates whether the view is currently in pressed state. Unless 6225 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6226 * the pressed state. 6227 * 6228 * @see #setPressed(boolean) 6229 * @see #isClickable() 6230 * @see #setClickable(boolean) 6231 * 6232 * @return true if the view is currently pressed, false otherwise 6233 */ 6234 public boolean isPressed() { 6235 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6236 } 6237 6238 /** 6239 * Indicates whether this view will save its state (that is, 6240 * whether its {@link #onSaveInstanceState} method will be called). 6241 * 6242 * @return Returns true if the view state saving is enabled, else false. 6243 * 6244 * @see #setSaveEnabled(boolean) 6245 * @attr ref android.R.styleable#View_saveEnabled 6246 */ 6247 public boolean isSaveEnabled() { 6248 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6249 } 6250 6251 /** 6252 * Controls whether the saving of this view's state is 6253 * enabled (that is, whether its {@link #onSaveInstanceState} method 6254 * will be called). Note that even if freezing is enabled, the 6255 * view still must have an id assigned to it (via {@link #setId(int)}) 6256 * for its state to be saved. This flag can only disable the 6257 * saving of this view; any child views may still have their state saved. 6258 * 6259 * @param enabled Set to false to <em>disable</em> state saving, or true 6260 * (the default) to allow it. 6261 * 6262 * @see #isSaveEnabled() 6263 * @see #setId(int) 6264 * @see #onSaveInstanceState() 6265 * @attr ref android.R.styleable#View_saveEnabled 6266 */ 6267 public void setSaveEnabled(boolean enabled) { 6268 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6269 } 6270 6271 /** 6272 * Gets whether the framework should discard touches when the view's 6273 * window is obscured by another visible window. 6274 * Refer to the {@link View} security documentation for more details. 6275 * 6276 * @return True if touch filtering is enabled. 6277 * 6278 * @see #setFilterTouchesWhenObscured(boolean) 6279 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6280 */ 6281 @ViewDebug.ExportedProperty 6282 public boolean getFilterTouchesWhenObscured() { 6283 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6284 } 6285 6286 /** 6287 * Sets whether the framework should discard touches when the view's 6288 * window is obscured by another visible window. 6289 * Refer to the {@link View} security documentation for more details. 6290 * 6291 * @param enabled True if touch filtering should be enabled. 6292 * 6293 * @see #getFilterTouchesWhenObscured 6294 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6295 */ 6296 public void setFilterTouchesWhenObscured(boolean enabled) { 6297 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6298 FILTER_TOUCHES_WHEN_OBSCURED); 6299 } 6300 6301 /** 6302 * Indicates whether the entire hierarchy under this view will save its 6303 * state when a state saving traversal occurs from its parent. The default 6304 * is true; if false, these views will not be saved unless 6305 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6306 * 6307 * @return Returns true if the view state saving from parent is enabled, else false. 6308 * 6309 * @see #setSaveFromParentEnabled(boolean) 6310 */ 6311 public boolean isSaveFromParentEnabled() { 6312 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6313 } 6314 6315 /** 6316 * Controls whether the entire hierarchy under this view will save its 6317 * state when a state saving traversal occurs from its parent. The default 6318 * is true; if false, these views will not be saved unless 6319 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6320 * 6321 * @param enabled Set to false to <em>disable</em> state saving, or true 6322 * (the default) to allow it. 6323 * 6324 * @see #isSaveFromParentEnabled() 6325 * @see #setId(int) 6326 * @see #onSaveInstanceState() 6327 */ 6328 public void setSaveFromParentEnabled(boolean enabled) { 6329 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6330 } 6331 6332 6333 /** 6334 * Returns whether this View is able to take focus. 6335 * 6336 * @return True if this view can take focus, or false otherwise. 6337 * @attr ref android.R.styleable#View_focusable 6338 */ 6339 @ViewDebug.ExportedProperty(category = "focus") 6340 public final boolean isFocusable() { 6341 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6342 } 6343 6344 /** 6345 * When a view is focusable, it may not want to take focus when in touch mode. 6346 * For example, a button would like focus when the user is navigating via a D-pad 6347 * so that the user can click on it, but once the user starts touching the screen, 6348 * the button shouldn't take focus 6349 * @return Whether the view is focusable in touch mode. 6350 * @attr ref android.R.styleable#View_focusableInTouchMode 6351 */ 6352 @ViewDebug.ExportedProperty 6353 public final boolean isFocusableInTouchMode() { 6354 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6355 } 6356 6357 /** 6358 * Find the nearest view in the specified direction that can take focus. 6359 * This does not actually give focus to that view. 6360 * 6361 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6362 * 6363 * @return The nearest focusable in the specified direction, or null if none 6364 * can be found. 6365 */ 6366 public View focusSearch(int direction) { 6367 if (mParent != null) { 6368 return mParent.focusSearch(this, direction); 6369 } else { 6370 return null; 6371 } 6372 } 6373 6374 /** 6375 * This method is the last chance for the focused view and its ancestors to 6376 * respond to an arrow key. This is called when the focused view did not 6377 * consume the key internally, nor could the view system find a new view in 6378 * the requested direction to give focus to. 6379 * 6380 * @param focused The currently focused view. 6381 * @param direction The direction focus wants to move. One of FOCUS_UP, 6382 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6383 * @return True if the this view consumed this unhandled move. 6384 */ 6385 public boolean dispatchUnhandledMove(View focused, int direction) { 6386 return false; 6387 } 6388 6389 /** 6390 * If a user manually specified the next view id for a particular direction, 6391 * use the root to look up the view. 6392 * @param root The root view of the hierarchy containing this view. 6393 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6394 * or FOCUS_BACKWARD. 6395 * @return The user specified next view, or null if there is none. 6396 */ 6397 View findUserSetNextFocus(View root, int direction) { 6398 switch (direction) { 6399 case FOCUS_LEFT: 6400 if (mNextFocusLeftId == View.NO_ID) return null; 6401 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6402 case FOCUS_RIGHT: 6403 if (mNextFocusRightId == View.NO_ID) return null; 6404 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6405 case FOCUS_UP: 6406 if (mNextFocusUpId == View.NO_ID) return null; 6407 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6408 case FOCUS_DOWN: 6409 if (mNextFocusDownId == View.NO_ID) return null; 6410 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6411 case FOCUS_FORWARD: 6412 if (mNextFocusForwardId == View.NO_ID) return null; 6413 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6414 case FOCUS_BACKWARD: { 6415 if (mID == View.NO_ID) return null; 6416 final int id = mID; 6417 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6418 @Override 6419 public boolean apply(View t) { 6420 return t.mNextFocusForwardId == id; 6421 } 6422 }); 6423 } 6424 } 6425 return null; 6426 } 6427 6428 private View findViewInsideOutShouldExist(View root, int id) { 6429 if (mMatchIdPredicate == null) { 6430 mMatchIdPredicate = new MatchIdPredicate(); 6431 } 6432 mMatchIdPredicate.mId = id; 6433 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6434 if (result == null) { 6435 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6436 } 6437 return result; 6438 } 6439 6440 /** 6441 * Find and return all focusable views that are descendants of this view, 6442 * possibly including this view if it is focusable itself. 6443 * 6444 * @param direction The direction of the focus 6445 * @return A list of focusable views 6446 */ 6447 public ArrayList<View> getFocusables(int direction) { 6448 ArrayList<View> result = new ArrayList<View>(24); 6449 addFocusables(result, direction); 6450 return result; 6451 } 6452 6453 /** 6454 * Add any focusable views that are descendants of this view (possibly 6455 * including this view if it is focusable itself) to views. If we are in touch mode, 6456 * only add views that are also focusable in touch mode. 6457 * 6458 * @param views Focusable views found so far 6459 * @param direction The direction of the focus 6460 */ 6461 public void addFocusables(ArrayList<View> views, int direction) { 6462 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6463 } 6464 6465 /** 6466 * Adds any focusable views that are descendants of this view (possibly 6467 * including this view if it is focusable itself) to views. This method 6468 * adds all focusable views regardless if we are in touch mode or 6469 * only views focusable in touch mode if we are in touch mode or 6470 * only views that can take accessibility focus if accessibility is enabeld 6471 * depending on the focusable mode paramater. 6472 * 6473 * @param views Focusable views found so far or null if all we are interested is 6474 * the number of focusables. 6475 * @param direction The direction of the focus. 6476 * @param focusableMode The type of focusables to be added. 6477 * 6478 * @see #FOCUSABLES_ALL 6479 * @see #FOCUSABLES_TOUCH_MODE 6480 */ 6481 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6482 if (views == null) { 6483 return; 6484 } 6485 if (!isFocusable()) { 6486 return; 6487 } 6488 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6489 && isInTouchMode() && !isFocusableInTouchMode()) { 6490 return; 6491 } 6492 views.add(this); 6493 } 6494 6495 /** 6496 * Finds the Views that contain given text. The containment is case insensitive. 6497 * The search is performed by either the text that the View renders or the content 6498 * description that describes the view for accessibility purposes and the view does 6499 * not render or both. Clients can specify how the search is to be performed via 6500 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6501 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6502 * 6503 * @param outViews The output list of matching Views. 6504 * @param searched The text to match against. 6505 * 6506 * @see #FIND_VIEWS_WITH_TEXT 6507 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6508 * @see #setContentDescription(CharSequence) 6509 */ 6510 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6511 if (getAccessibilityNodeProvider() != null) { 6512 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6513 outViews.add(this); 6514 } 6515 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6516 && (searched != null && searched.length() > 0) 6517 && (mContentDescription != null && mContentDescription.length() > 0)) { 6518 String searchedLowerCase = searched.toString().toLowerCase(); 6519 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6520 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6521 outViews.add(this); 6522 } 6523 } 6524 } 6525 6526 /** 6527 * Find and return all touchable views that are descendants of this view, 6528 * possibly including this view if it is touchable itself. 6529 * 6530 * @return A list of touchable views 6531 */ 6532 public ArrayList<View> getTouchables() { 6533 ArrayList<View> result = new ArrayList<View>(); 6534 addTouchables(result); 6535 return result; 6536 } 6537 6538 /** 6539 * Add any touchable views that are descendants of this view (possibly 6540 * including this view if it is touchable itself) to views. 6541 * 6542 * @param views Touchable views found so far 6543 */ 6544 public void addTouchables(ArrayList<View> views) { 6545 final int viewFlags = mViewFlags; 6546 6547 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6548 && (viewFlags & ENABLED_MASK) == ENABLED) { 6549 views.add(this); 6550 } 6551 } 6552 6553 /** 6554 * Returns whether this View is accessibility focused. 6555 * 6556 * @return True if this View is accessibility focused. 6557 */ 6558 boolean isAccessibilityFocused() { 6559 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6560 } 6561 6562 /** 6563 * Call this to try to give accessibility focus to this view. 6564 * 6565 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6566 * returns false or the view is no visible or the view already has accessibility 6567 * focus. 6568 * 6569 * See also {@link #focusSearch(int)}, which is what you call to say that you 6570 * have focus, and you want your parent to look for the next one. 6571 * 6572 * @return Whether this view actually took accessibility focus. 6573 * 6574 * @hide 6575 */ 6576 public boolean requestAccessibilityFocus() { 6577 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6578 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6579 return false; 6580 } 6581 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6582 return false; 6583 } 6584 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6585 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6586 ViewRootImpl viewRootImpl = getViewRootImpl(); 6587 if (viewRootImpl != null) { 6588 viewRootImpl.setAccessibilityFocus(this, null); 6589 } 6590 invalidate(); 6591 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6592 notifyAccessibilityStateChanged(); 6593 return true; 6594 } 6595 return false; 6596 } 6597 6598 /** 6599 * Call this to try to clear accessibility focus of this view. 6600 * 6601 * See also {@link #focusSearch(int)}, which is what you call to say that you 6602 * have focus, and you want your parent to look for the next one. 6603 * 6604 * @hide 6605 */ 6606 public void clearAccessibilityFocus() { 6607 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6608 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6609 invalidate(); 6610 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6611 notifyAccessibilityStateChanged(); 6612 } 6613 // Clear the global reference of accessibility focus if this 6614 // view or any of its descendants had accessibility focus. 6615 ViewRootImpl viewRootImpl = getViewRootImpl(); 6616 if (viewRootImpl != null) { 6617 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6618 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6619 viewRootImpl.setAccessibilityFocus(null, null); 6620 } 6621 } 6622 } 6623 6624 private void sendAccessibilityHoverEvent(int eventType) { 6625 // Since we are not delivering to a client accessibility events from not 6626 // important views (unless the clinet request that) we need to fire the 6627 // event from the deepest view exposed to the client. As a consequence if 6628 // the user crosses a not exposed view the client will see enter and exit 6629 // of the exposed predecessor followed by and enter and exit of that same 6630 // predecessor when entering and exiting the not exposed descendant. This 6631 // is fine since the client has a clear idea which view is hovered at the 6632 // price of a couple more events being sent. This is a simple and 6633 // working solution. 6634 View source = this; 6635 while (true) { 6636 if (source.includeForAccessibility()) { 6637 source.sendAccessibilityEvent(eventType); 6638 return; 6639 } 6640 ViewParent parent = source.getParent(); 6641 if (parent instanceof View) { 6642 source = (View) parent; 6643 } else { 6644 return; 6645 } 6646 } 6647 } 6648 6649 /** 6650 * Clears accessibility focus without calling any callback methods 6651 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6652 * is used for clearing accessibility focus when giving this focus to 6653 * another view. 6654 */ 6655 void clearAccessibilityFocusNoCallbacks() { 6656 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6657 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6658 invalidate(); 6659 } 6660 } 6661 6662 /** 6663 * Call this to try to give focus to a specific view or to one of its 6664 * descendants. 6665 * 6666 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6667 * false), or if it is focusable and it is not focusable in touch mode 6668 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6669 * 6670 * See also {@link #focusSearch(int)}, which is what you call to say that you 6671 * have focus, and you want your parent to look for the next one. 6672 * 6673 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6674 * {@link #FOCUS_DOWN} and <code>null</code>. 6675 * 6676 * @return Whether this view or one of its descendants actually took focus. 6677 */ 6678 public final boolean requestFocus() { 6679 return requestFocus(View.FOCUS_DOWN); 6680 } 6681 6682 /** 6683 * Call this to try to give focus to a specific view or to one of its 6684 * descendants and give it a hint about what direction focus is heading. 6685 * 6686 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6687 * false), or if it is focusable and it is not focusable in touch mode 6688 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6689 * 6690 * See also {@link #focusSearch(int)}, which is what you call to say that you 6691 * have focus, and you want your parent to look for the next one. 6692 * 6693 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6694 * <code>null</code> set for the previously focused rectangle. 6695 * 6696 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6697 * @return Whether this view or one of its descendants actually took focus. 6698 */ 6699 public final boolean requestFocus(int direction) { 6700 return requestFocus(direction, null); 6701 } 6702 6703 /** 6704 * Call this to try to give focus to a specific view or to one of its descendants 6705 * and give it hints about the direction and a specific rectangle that the focus 6706 * is coming from. The rectangle can help give larger views a finer grained hint 6707 * about where focus is coming from, and therefore, where to show selection, or 6708 * forward focus change internally. 6709 * 6710 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6711 * false), or if it is focusable and it is not focusable in touch mode 6712 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6713 * 6714 * A View will not take focus if it is not visible. 6715 * 6716 * A View will not take focus if one of its parents has 6717 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6718 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6719 * 6720 * See also {@link #focusSearch(int)}, which is what you call to say that you 6721 * have focus, and you want your parent to look for the next one. 6722 * 6723 * You may wish to override this method if your custom {@link View} has an internal 6724 * {@link View} that it wishes to forward the request to. 6725 * 6726 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6727 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6728 * to give a finer grained hint about where focus is coming from. May be null 6729 * if there is no hint. 6730 * @return Whether this view or one of its descendants actually took focus. 6731 */ 6732 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6733 return requestFocusNoSearch(direction, previouslyFocusedRect); 6734 } 6735 6736 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6737 // need to be focusable 6738 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6739 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6740 return false; 6741 } 6742 6743 // need to be focusable in touch mode if in touch mode 6744 if (isInTouchMode() && 6745 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6746 return false; 6747 } 6748 6749 // need to not have any parents blocking us 6750 if (hasAncestorThatBlocksDescendantFocus()) { 6751 return false; 6752 } 6753 6754 handleFocusGainInternal(direction, previouslyFocusedRect); 6755 return true; 6756 } 6757 6758 /** 6759 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6760 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6761 * touch mode to request focus when they are touched. 6762 * 6763 * @return Whether this view or one of its descendants actually took focus. 6764 * 6765 * @see #isInTouchMode() 6766 * 6767 */ 6768 public final boolean requestFocusFromTouch() { 6769 // Leave touch mode if we need to 6770 if (isInTouchMode()) { 6771 ViewRootImpl viewRoot = getViewRootImpl(); 6772 if (viewRoot != null) { 6773 viewRoot.ensureTouchMode(false); 6774 } 6775 } 6776 return requestFocus(View.FOCUS_DOWN); 6777 } 6778 6779 /** 6780 * @return Whether any ancestor of this view blocks descendant focus. 6781 */ 6782 private boolean hasAncestorThatBlocksDescendantFocus() { 6783 ViewParent ancestor = mParent; 6784 while (ancestor instanceof ViewGroup) { 6785 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6786 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6787 return true; 6788 } else { 6789 ancestor = vgAncestor.getParent(); 6790 } 6791 } 6792 return false; 6793 } 6794 6795 /** 6796 * Gets the mode for determining whether this View is important for accessibility 6797 * which is if it fires accessibility events and if it is reported to 6798 * accessibility services that query the screen. 6799 * 6800 * @return The mode for determining whether a View is important for accessibility. 6801 * 6802 * @attr ref android.R.styleable#View_importantForAccessibility 6803 * 6804 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6805 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6806 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6807 */ 6808 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6809 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6810 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6811 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6812 }) 6813 public int getImportantForAccessibility() { 6814 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6815 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6816 } 6817 6818 /** 6819 * Sets how to determine whether this view is important for accessibility 6820 * which is if it fires accessibility events and if it is reported to 6821 * accessibility services that query the screen. 6822 * 6823 * @param mode How to determine whether this view is important for accessibility. 6824 * 6825 * @attr ref android.R.styleable#View_importantForAccessibility 6826 * 6827 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6828 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6829 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6830 */ 6831 public void setImportantForAccessibility(int mode) { 6832 if (mode != getImportantForAccessibility()) { 6833 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6834 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6835 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6836 notifyAccessibilityStateChanged(); 6837 } 6838 } 6839 6840 /** 6841 * Gets whether this view should be exposed for accessibility. 6842 * 6843 * @return Whether the view is exposed for accessibility. 6844 * 6845 * @hide 6846 */ 6847 public boolean isImportantForAccessibility() { 6848 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6849 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6850 switch (mode) { 6851 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6852 return true; 6853 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6854 return false; 6855 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6856 return isActionableForAccessibility() || hasListenersForAccessibility() 6857 || getAccessibilityNodeProvider() != null; 6858 default: 6859 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6860 + mode); 6861 } 6862 } 6863 6864 /** 6865 * Gets the parent for accessibility purposes. Note that the parent for 6866 * accessibility is not necessary the immediate parent. It is the first 6867 * predecessor that is important for accessibility. 6868 * 6869 * @return The parent for accessibility purposes. 6870 */ 6871 public ViewParent getParentForAccessibility() { 6872 if (mParent instanceof View) { 6873 View parentView = (View) mParent; 6874 if (parentView.includeForAccessibility()) { 6875 return mParent; 6876 } else { 6877 return mParent.getParentForAccessibility(); 6878 } 6879 } 6880 return null; 6881 } 6882 6883 /** 6884 * Adds the children of a given View for accessibility. Since some Views are 6885 * not important for accessibility the children for accessibility are not 6886 * necessarily direct children of the riew, rather they are the first level of 6887 * descendants important for accessibility. 6888 * 6889 * @param children The list of children for accessibility. 6890 */ 6891 public void addChildrenForAccessibility(ArrayList<View> children) { 6892 if (includeForAccessibility()) { 6893 children.add(this); 6894 } 6895 } 6896 6897 /** 6898 * Whether to regard this view for accessibility. A view is regarded for 6899 * accessibility if it is important for accessibility or the querying 6900 * accessibility service has explicitly requested that view not 6901 * important for accessibility are regarded. 6902 * 6903 * @return Whether to regard the view for accessibility. 6904 * 6905 * @hide 6906 */ 6907 public boolean includeForAccessibility() { 6908 if (mAttachInfo != null) { 6909 return (mAttachInfo.mAccessibilityFetchFlags 6910 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 6911 || isImportantForAccessibility(); 6912 } 6913 return false; 6914 } 6915 6916 /** 6917 * Returns whether the View is considered actionable from 6918 * accessibility perspective. Such view are important for 6919 * accessibility. 6920 * 6921 * @return True if the view is actionable for accessibility. 6922 * 6923 * @hide 6924 */ 6925 public boolean isActionableForAccessibility() { 6926 return (isClickable() || isLongClickable() || isFocusable()); 6927 } 6928 6929 /** 6930 * Returns whether the View has registered callbacks wich makes it 6931 * important for accessibility. 6932 * 6933 * @return True if the view is actionable for accessibility. 6934 */ 6935 private boolean hasListenersForAccessibility() { 6936 ListenerInfo info = getListenerInfo(); 6937 return mTouchDelegate != null || info.mOnKeyListener != null 6938 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6939 || info.mOnHoverListener != null || info.mOnDragListener != null; 6940 } 6941 6942 /** 6943 * Notifies accessibility services that some view's important for 6944 * accessibility state has changed. Note that such notifications 6945 * are made at most once every 6946 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6947 * to avoid unnecessary load to the system. Also once a view has 6948 * made a notifucation this method is a NOP until the notification has 6949 * been sent to clients. 6950 * 6951 * @hide 6952 * 6953 * TODO: Makse sure this method is called for any view state change 6954 * that is interesting for accessilility purposes. 6955 */ 6956 public void notifyAccessibilityStateChanged() { 6957 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6958 return; 6959 } 6960 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_STATE_CHANGED) == 0) { 6961 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_STATE_CHANGED; 6962 if (mParent != null) { 6963 mParent.childAccessibilityStateChanged(this); 6964 } 6965 } 6966 } 6967 6968 /** 6969 * Reset the state indicating the this view has requested clients 6970 * interested in its accessibility state to be notified. 6971 * 6972 * @hide 6973 */ 6974 public void resetAccessibilityStateChanged() { 6975 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_STATE_CHANGED; 6976 } 6977 6978 /** 6979 * Performs the specified accessibility action on the view. For 6980 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6981 * <p> 6982 * If an {@link AccessibilityDelegate} has been specified via calling 6983 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6984 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6985 * is responsible for handling this call. 6986 * </p> 6987 * 6988 * @param action The action to perform. 6989 * @param arguments Optional action arguments. 6990 * @return Whether the action was performed. 6991 */ 6992 public boolean performAccessibilityAction(int action, Bundle arguments) { 6993 if (mAccessibilityDelegate != null) { 6994 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6995 } else { 6996 return performAccessibilityActionInternal(action, arguments); 6997 } 6998 } 6999 7000 /** 7001 * @see #performAccessibilityAction(int, Bundle) 7002 * 7003 * Note: Called from the default {@link AccessibilityDelegate}. 7004 */ 7005 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 7006 switch (action) { 7007 case AccessibilityNodeInfo.ACTION_CLICK: { 7008 if (isClickable()) { 7009 performClick(); 7010 return true; 7011 } 7012 } break; 7013 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 7014 if (isLongClickable()) { 7015 performLongClick(); 7016 return true; 7017 } 7018 } break; 7019 case AccessibilityNodeInfo.ACTION_FOCUS: { 7020 if (!hasFocus()) { 7021 // Get out of touch mode since accessibility 7022 // wants to move focus around. 7023 getViewRootImpl().ensureTouchMode(false); 7024 return requestFocus(); 7025 } 7026 } break; 7027 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 7028 if (hasFocus()) { 7029 clearFocus(); 7030 return !isFocused(); 7031 } 7032 } break; 7033 case AccessibilityNodeInfo.ACTION_SELECT: { 7034 if (!isSelected()) { 7035 setSelected(true); 7036 return isSelected(); 7037 } 7038 } break; 7039 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 7040 if (isSelected()) { 7041 setSelected(false); 7042 return !isSelected(); 7043 } 7044 } break; 7045 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 7046 if (!isAccessibilityFocused()) { 7047 return requestAccessibilityFocus(); 7048 } 7049 } break; 7050 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 7051 if (isAccessibilityFocused()) { 7052 clearAccessibilityFocus(); 7053 return true; 7054 } 7055 } break; 7056 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 7057 if (arguments != null) { 7058 final int granularity = arguments.getInt( 7059 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7060 final boolean extendSelection = arguments.getBoolean( 7061 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7062 return nextAtGranularity(granularity, extendSelection); 7063 } 7064 } break; 7065 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 7066 if (arguments != null) { 7067 final int granularity = arguments.getInt( 7068 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7069 final boolean extendSelection = arguments.getBoolean( 7070 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7071 return previousAtGranularity(granularity, extendSelection); 7072 } 7073 } break; 7074 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 7075 CharSequence text = getIterableTextForAccessibility(); 7076 if (text == null) { 7077 return false; 7078 } 7079 final int start = (arguments != null) ? arguments.getInt( 7080 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 7081 final int end = (arguments != null) ? arguments.getInt( 7082 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 7083 // Only cursor position can be specified (selection length == 0) 7084 if ((getAccessibilitySelectionStart() != start 7085 || getAccessibilitySelectionEnd() != end) 7086 && (start == end)) { 7087 setAccessibilitySelection(start, end); 7088 notifyAccessibilityStateChanged(); 7089 return true; 7090 } 7091 } break; 7092 } 7093 return false; 7094 } 7095 7096 private boolean nextAtGranularity(int granularity, boolean extendSelection) { 7097 CharSequence text = getIterableTextForAccessibility(); 7098 if (text == null || text.length() == 0) { 7099 return false; 7100 } 7101 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7102 if (iterator == null) { 7103 return false; 7104 } 7105 int current = getAccessibilitySelectionEnd(); 7106 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7107 current = 0; 7108 } 7109 final int[] range = iterator.following(current); 7110 if (range == null) { 7111 return false; 7112 } 7113 final int start = range[0]; 7114 final int end = range[1]; 7115 if (extendSelection && isAccessibilitySelectionExtendable()) { 7116 int selectionStart = getAccessibilitySelectionStart(); 7117 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7118 selectionStart = start; 7119 } 7120 setAccessibilitySelection(selectionStart, end); 7121 } else { 7122 setAccessibilitySelection(end, end); 7123 } 7124 sendViewTextTraversedAtGranularityEvent( 7125 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 7126 granularity, start, end); 7127 return true; 7128 } 7129 7130 private boolean previousAtGranularity(int granularity, boolean extendSelection) { 7131 CharSequence text = getIterableTextForAccessibility(); 7132 if (text == null || text.length() == 0) { 7133 return false; 7134 } 7135 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7136 if (iterator == null) { 7137 return false; 7138 } 7139 int current = getAccessibilitySelectionStart(); 7140 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7141 current = text.length(); 7142 } 7143 final int[] range = iterator.preceding(current); 7144 if (range == null) { 7145 return false; 7146 } 7147 final int start = range[0]; 7148 final int end = range[1]; 7149 if (extendSelection && isAccessibilitySelectionExtendable()) { 7150 int selectionEnd = getAccessibilitySelectionEnd(); 7151 if (selectionEnd == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7152 selectionEnd = end; 7153 } 7154 setAccessibilitySelection(start, selectionEnd); 7155 } else { 7156 setAccessibilitySelection(start, start); 7157 } 7158 sendViewTextTraversedAtGranularityEvent( 7159 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 7160 granularity, start, end); 7161 return true; 7162 } 7163 7164 /** 7165 * Gets the text reported for accessibility purposes. 7166 * 7167 * @return The accessibility text. 7168 * 7169 * @hide 7170 */ 7171 public CharSequence getIterableTextForAccessibility() { 7172 return getContentDescription(); 7173 } 7174 7175 /** 7176 * Gets whether accessibility selection can be extended. 7177 * 7178 * @return If selection is extensible. 7179 * 7180 * @hide 7181 */ 7182 public boolean isAccessibilitySelectionExtendable() { 7183 return false; 7184 } 7185 7186 /** 7187 * @hide 7188 */ 7189 public int getAccessibilitySelectionStart() { 7190 return mAccessibilityCursorPosition; 7191 } 7192 7193 /** 7194 * @hide 7195 */ 7196 public int getAccessibilitySelectionEnd() { 7197 return getAccessibilitySelectionStart(); 7198 } 7199 7200 /** 7201 * @hide 7202 */ 7203 public void setAccessibilitySelection(int start, int end) { 7204 if (start == end && end == mAccessibilityCursorPosition) { 7205 return; 7206 } 7207 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 7208 mAccessibilityCursorPosition = start; 7209 } else { 7210 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 7211 } 7212 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 7213 } 7214 7215 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7216 int fromIndex, int toIndex) { 7217 if (mParent == null) { 7218 return; 7219 } 7220 AccessibilityEvent event = AccessibilityEvent.obtain( 7221 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7222 onInitializeAccessibilityEvent(event); 7223 onPopulateAccessibilityEvent(event); 7224 event.setFromIndex(fromIndex); 7225 event.setToIndex(toIndex); 7226 event.setAction(action); 7227 event.setMovementGranularity(granularity); 7228 mParent.requestSendAccessibilityEvent(this, event); 7229 } 7230 7231 /** 7232 * @hide 7233 */ 7234 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7235 switch (granularity) { 7236 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7237 CharSequence text = getIterableTextForAccessibility(); 7238 if (text != null && text.length() > 0) { 7239 CharacterTextSegmentIterator iterator = 7240 CharacterTextSegmentIterator.getInstance( 7241 mContext.getResources().getConfiguration().locale); 7242 iterator.initialize(text.toString()); 7243 return iterator; 7244 } 7245 } break; 7246 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7247 CharSequence text = getIterableTextForAccessibility(); 7248 if (text != null && text.length() > 0) { 7249 WordTextSegmentIterator iterator = 7250 WordTextSegmentIterator.getInstance( 7251 mContext.getResources().getConfiguration().locale); 7252 iterator.initialize(text.toString()); 7253 return iterator; 7254 } 7255 } break; 7256 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7257 CharSequence text = getIterableTextForAccessibility(); 7258 if (text != null && text.length() > 0) { 7259 ParagraphTextSegmentIterator iterator = 7260 ParagraphTextSegmentIterator.getInstance(); 7261 iterator.initialize(text.toString()); 7262 return iterator; 7263 } 7264 } break; 7265 } 7266 return null; 7267 } 7268 7269 /** 7270 * @hide 7271 */ 7272 public void dispatchStartTemporaryDetach() { 7273 clearAccessibilityFocus(); 7274 clearDisplayList(); 7275 7276 onStartTemporaryDetach(); 7277 } 7278 7279 /** 7280 * This is called when a container is going to temporarily detach a child, with 7281 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7282 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7283 * {@link #onDetachedFromWindow()} when the container is done. 7284 */ 7285 public void onStartTemporaryDetach() { 7286 removeUnsetPressCallback(); 7287 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7288 } 7289 7290 /** 7291 * @hide 7292 */ 7293 public void dispatchFinishTemporaryDetach() { 7294 onFinishTemporaryDetach(); 7295 } 7296 7297 /** 7298 * Called after {@link #onStartTemporaryDetach} when the container is done 7299 * changing the view. 7300 */ 7301 public void onFinishTemporaryDetach() { 7302 } 7303 7304 /** 7305 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7306 * for this view's window. Returns null if the view is not currently attached 7307 * to the window. Normally you will not need to use this directly, but 7308 * just use the standard high-level event callbacks like 7309 * {@link #onKeyDown(int, KeyEvent)}. 7310 */ 7311 public KeyEvent.DispatcherState getKeyDispatcherState() { 7312 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7313 } 7314 7315 /** 7316 * Dispatch a key event before it is processed by any input method 7317 * associated with the view hierarchy. This can be used to intercept 7318 * key events in special situations before the IME consumes them; a 7319 * typical example would be handling the BACK key to update the application's 7320 * UI instead of allowing the IME to see it and close itself. 7321 * 7322 * @param event The key event to be dispatched. 7323 * @return True if the event was handled, false otherwise. 7324 */ 7325 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7326 return onKeyPreIme(event.getKeyCode(), event); 7327 } 7328 7329 /** 7330 * Dispatch a key event to the next view on the focus path. This path runs 7331 * from the top of the view tree down to the currently focused view. If this 7332 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7333 * the next node down the focus path. This method also fires any key 7334 * listeners. 7335 * 7336 * @param event The key event to be dispatched. 7337 * @return True if the event was handled, false otherwise. 7338 */ 7339 public boolean dispatchKeyEvent(KeyEvent event) { 7340 if (mInputEventConsistencyVerifier != null) { 7341 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7342 } 7343 7344 // Give any attached key listener a first crack at the event. 7345 //noinspection SimplifiableIfStatement 7346 ListenerInfo li = mListenerInfo; 7347 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7348 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7349 return true; 7350 } 7351 7352 if (event.dispatch(this, mAttachInfo != null 7353 ? mAttachInfo.mKeyDispatchState : null, this)) { 7354 return true; 7355 } 7356 7357 if (mInputEventConsistencyVerifier != null) { 7358 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7359 } 7360 return false; 7361 } 7362 7363 /** 7364 * Dispatches a key shortcut event. 7365 * 7366 * @param event The key event to be dispatched. 7367 * @return True if the event was handled by the view, false otherwise. 7368 */ 7369 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7370 return onKeyShortcut(event.getKeyCode(), event); 7371 } 7372 7373 /** 7374 * Pass the touch screen motion event down to the target view, or this 7375 * view if it is the target. 7376 * 7377 * @param event The motion event to be dispatched. 7378 * @return True if the event was handled by the view, false otherwise. 7379 */ 7380 public boolean dispatchTouchEvent(MotionEvent event) { 7381 if (mInputEventConsistencyVerifier != null) { 7382 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7383 } 7384 7385 if (onFilterTouchEventForSecurity(event)) { 7386 //noinspection SimplifiableIfStatement 7387 ListenerInfo li = mListenerInfo; 7388 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7389 && li.mOnTouchListener.onTouch(this, event)) { 7390 return true; 7391 } 7392 7393 if (onTouchEvent(event)) { 7394 return true; 7395 } 7396 } 7397 7398 if (mInputEventConsistencyVerifier != null) { 7399 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7400 } 7401 return false; 7402 } 7403 7404 /** 7405 * Filter the touch event to apply security policies. 7406 * 7407 * @param event The motion event to be filtered. 7408 * @return True if the event should be dispatched, false if the event should be dropped. 7409 * 7410 * @see #getFilterTouchesWhenObscured 7411 */ 7412 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7413 //noinspection RedundantIfStatement 7414 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7415 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7416 // Window is obscured, drop this touch. 7417 return false; 7418 } 7419 return true; 7420 } 7421 7422 /** 7423 * Pass a trackball motion event down to the focused view. 7424 * 7425 * @param event The motion event to be dispatched. 7426 * @return True if the event was handled by the view, false otherwise. 7427 */ 7428 public boolean dispatchTrackballEvent(MotionEvent event) { 7429 if (mInputEventConsistencyVerifier != null) { 7430 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7431 } 7432 7433 return onTrackballEvent(event); 7434 } 7435 7436 /** 7437 * Dispatch a generic motion event. 7438 * <p> 7439 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7440 * are delivered to the view under the pointer. All other generic motion events are 7441 * delivered to the focused view. Hover events are handled specially and are delivered 7442 * to {@link #onHoverEvent(MotionEvent)}. 7443 * </p> 7444 * 7445 * @param event The motion event to be dispatched. 7446 * @return True if the event was handled by the view, false otherwise. 7447 */ 7448 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7449 if (mInputEventConsistencyVerifier != null) { 7450 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7451 } 7452 7453 final int source = event.getSource(); 7454 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7455 final int action = event.getAction(); 7456 if (action == MotionEvent.ACTION_HOVER_ENTER 7457 || action == MotionEvent.ACTION_HOVER_MOVE 7458 || action == MotionEvent.ACTION_HOVER_EXIT) { 7459 if (dispatchHoverEvent(event)) { 7460 return true; 7461 } 7462 } else if (dispatchGenericPointerEvent(event)) { 7463 return true; 7464 } 7465 } else if (dispatchGenericFocusedEvent(event)) { 7466 return true; 7467 } 7468 7469 if (dispatchGenericMotionEventInternal(event)) { 7470 return true; 7471 } 7472 7473 if (mInputEventConsistencyVerifier != null) { 7474 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7475 } 7476 return false; 7477 } 7478 7479 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7480 //noinspection SimplifiableIfStatement 7481 ListenerInfo li = mListenerInfo; 7482 if (li != null && li.mOnGenericMotionListener != null 7483 && (mViewFlags & ENABLED_MASK) == ENABLED 7484 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7485 return true; 7486 } 7487 7488 if (onGenericMotionEvent(event)) { 7489 return true; 7490 } 7491 7492 if (mInputEventConsistencyVerifier != null) { 7493 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7494 } 7495 return false; 7496 } 7497 7498 /** 7499 * Dispatch a hover event. 7500 * <p> 7501 * Do not call this method directly. 7502 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7503 * </p> 7504 * 7505 * @param event The motion event to be dispatched. 7506 * @return True if the event was handled by the view, false otherwise. 7507 */ 7508 protected boolean dispatchHoverEvent(MotionEvent event) { 7509 //noinspection SimplifiableIfStatement 7510 ListenerInfo li = mListenerInfo; 7511 if (li != null && li.mOnHoverListener != null 7512 && (mViewFlags & ENABLED_MASK) == ENABLED 7513 && li.mOnHoverListener.onHover(this, event)) { 7514 return true; 7515 } 7516 7517 return onHoverEvent(event); 7518 } 7519 7520 /** 7521 * Returns true if the view has a child to which it has recently sent 7522 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7523 * it does not have a hovered child, then it must be the innermost hovered view. 7524 * @hide 7525 */ 7526 protected boolean hasHoveredChild() { 7527 return false; 7528 } 7529 7530 /** 7531 * Dispatch a generic motion event to the view under the first pointer. 7532 * <p> 7533 * Do not call this method directly. 7534 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7535 * </p> 7536 * 7537 * @param event The motion event to be dispatched. 7538 * @return True if the event was handled by the view, false otherwise. 7539 */ 7540 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7541 return false; 7542 } 7543 7544 /** 7545 * Dispatch a generic motion event to the currently focused view. 7546 * <p> 7547 * Do not call this method directly. 7548 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7549 * </p> 7550 * 7551 * @param event The motion event to be dispatched. 7552 * @return True if the event was handled by the view, false otherwise. 7553 */ 7554 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7555 return false; 7556 } 7557 7558 /** 7559 * Dispatch a pointer event. 7560 * <p> 7561 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7562 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7563 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7564 * and should not be expected to handle other pointing device features. 7565 * </p> 7566 * 7567 * @param event The motion event to be dispatched. 7568 * @return True if the event was handled by the view, false otherwise. 7569 * @hide 7570 */ 7571 public final boolean dispatchPointerEvent(MotionEvent event) { 7572 if (event.isTouchEvent()) { 7573 return dispatchTouchEvent(event); 7574 } else { 7575 return dispatchGenericMotionEvent(event); 7576 } 7577 } 7578 7579 /** 7580 * Called when the window containing this view gains or loses window focus. 7581 * ViewGroups should override to route to their children. 7582 * 7583 * @param hasFocus True if the window containing this view now has focus, 7584 * false otherwise. 7585 */ 7586 public void dispatchWindowFocusChanged(boolean hasFocus) { 7587 onWindowFocusChanged(hasFocus); 7588 } 7589 7590 /** 7591 * Called when the window containing this view gains or loses focus. Note 7592 * that this is separate from view focus: to receive key events, both 7593 * your view and its window must have focus. If a window is displayed 7594 * on top of yours that takes input focus, then your own window will lose 7595 * focus but the view focus will remain unchanged. 7596 * 7597 * @param hasWindowFocus True if the window containing this view now has 7598 * focus, false otherwise. 7599 */ 7600 public void onWindowFocusChanged(boolean hasWindowFocus) { 7601 InputMethodManager imm = InputMethodManager.peekInstance(); 7602 if (!hasWindowFocus) { 7603 if (isPressed()) { 7604 setPressed(false); 7605 } 7606 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7607 imm.focusOut(this); 7608 } 7609 removeLongPressCallback(); 7610 removeTapCallback(); 7611 onFocusLost(); 7612 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7613 imm.focusIn(this); 7614 } 7615 refreshDrawableState(); 7616 } 7617 7618 /** 7619 * Returns true if this view is in a window that currently has window focus. 7620 * Note that this is not the same as the view itself having focus. 7621 * 7622 * @return True if this view is in a window that currently has window focus. 7623 */ 7624 public boolean hasWindowFocus() { 7625 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7626 } 7627 7628 /** 7629 * Dispatch a view visibility change down the view hierarchy. 7630 * ViewGroups should override to route to their children. 7631 * @param changedView The view whose visibility changed. Could be 'this' or 7632 * an ancestor view. 7633 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7634 * {@link #INVISIBLE} or {@link #GONE}. 7635 */ 7636 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7637 onVisibilityChanged(changedView, visibility); 7638 } 7639 7640 /** 7641 * Called when the visibility of the view or an ancestor of the view is changed. 7642 * @param changedView The view whose visibility changed. Could be 'this' or 7643 * an ancestor view. 7644 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7645 * {@link #INVISIBLE} or {@link #GONE}. 7646 */ 7647 protected void onVisibilityChanged(View changedView, int visibility) { 7648 if (visibility == VISIBLE) { 7649 if (mAttachInfo != null) { 7650 initialAwakenScrollBars(); 7651 } else { 7652 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7653 } 7654 } 7655 } 7656 7657 /** 7658 * Dispatch a hint about whether this view is displayed. For instance, when 7659 * a View moves out of the screen, it might receives a display hint indicating 7660 * the view is not displayed. Applications should not <em>rely</em> on this hint 7661 * as there is no guarantee that they will receive one. 7662 * 7663 * @param hint A hint about whether or not this view is displayed: 7664 * {@link #VISIBLE} or {@link #INVISIBLE}. 7665 */ 7666 public void dispatchDisplayHint(int hint) { 7667 onDisplayHint(hint); 7668 } 7669 7670 /** 7671 * Gives this view a hint about whether is displayed or not. For instance, when 7672 * a View moves out of the screen, it might receives a display hint indicating 7673 * the view is not displayed. Applications should not <em>rely</em> on this hint 7674 * as there is no guarantee that they will receive one. 7675 * 7676 * @param hint A hint about whether or not this view is displayed: 7677 * {@link #VISIBLE} or {@link #INVISIBLE}. 7678 */ 7679 protected void onDisplayHint(int hint) { 7680 } 7681 7682 /** 7683 * Dispatch a window visibility change down the view hierarchy. 7684 * ViewGroups should override to route to their children. 7685 * 7686 * @param visibility The new visibility of the window. 7687 * 7688 * @see #onWindowVisibilityChanged(int) 7689 */ 7690 public void dispatchWindowVisibilityChanged(int visibility) { 7691 onWindowVisibilityChanged(visibility); 7692 } 7693 7694 /** 7695 * Called when the window containing has change its visibility 7696 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7697 * that this tells you whether or not your window is being made visible 7698 * to the window manager; this does <em>not</em> tell you whether or not 7699 * your window is obscured by other windows on the screen, even if it 7700 * is itself visible. 7701 * 7702 * @param visibility The new visibility of the window. 7703 */ 7704 protected void onWindowVisibilityChanged(int visibility) { 7705 if (visibility == VISIBLE) { 7706 initialAwakenScrollBars(); 7707 } 7708 } 7709 7710 /** 7711 * Returns the current visibility of the window this view is attached to 7712 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7713 * 7714 * @return Returns the current visibility of the view's window. 7715 */ 7716 public int getWindowVisibility() { 7717 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7718 } 7719 7720 /** 7721 * Retrieve the overall visible display size in which the window this view is 7722 * attached to has been positioned in. This takes into account screen 7723 * decorations above the window, for both cases where the window itself 7724 * is being position inside of them or the window is being placed under 7725 * then and covered insets are used for the window to position its content 7726 * inside. In effect, this tells you the available area where content can 7727 * be placed and remain visible to users. 7728 * 7729 * <p>This function requires an IPC back to the window manager to retrieve 7730 * the requested information, so should not be used in performance critical 7731 * code like drawing. 7732 * 7733 * @param outRect Filled in with the visible display frame. If the view 7734 * is not attached to a window, this is simply the raw display size. 7735 */ 7736 public void getWindowVisibleDisplayFrame(Rect outRect) { 7737 if (mAttachInfo != null) { 7738 try { 7739 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7740 } catch (RemoteException e) { 7741 return; 7742 } 7743 // XXX This is really broken, and probably all needs to be done 7744 // in the window manager, and we need to know more about whether 7745 // we want the area behind or in front of the IME. 7746 final Rect insets = mAttachInfo.mVisibleInsets; 7747 outRect.left += insets.left; 7748 outRect.top += insets.top; 7749 outRect.right -= insets.right; 7750 outRect.bottom -= insets.bottom; 7751 return; 7752 } 7753 // The view is not attached to a display so we don't have a context. 7754 // Make a best guess about the display size. 7755 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 7756 d.getRectSize(outRect); 7757 } 7758 7759 /** 7760 * Dispatch a notification about a resource configuration change down 7761 * the view hierarchy. 7762 * ViewGroups should override to route to their children. 7763 * 7764 * @param newConfig The new resource configuration. 7765 * 7766 * @see #onConfigurationChanged(android.content.res.Configuration) 7767 */ 7768 public void dispatchConfigurationChanged(Configuration newConfig) { 7769 onConfigurationChanged(newConfig); 7770 } 7771 7772 /** 7773 * Called when the current configuration of the resources being used 7774 * by the application have changed. You can use this to decide when 7775 * to reload resources that can changed based on orientation and other 7776 * configuration characterstics. You only need to use this if you are 7777 * not relying on the normal {@link android.app.Activity} mechanism of 7778 * recreating the activity instance upon a configuration change. 7779 * 7780 * @param newConfig The new resource configuration. 7781 */ 7782 protected void onConfigurationChanged(Configuration newConfig) { 7783 } 7784 7785 /** 7786 * Private function to aggregate all per-view attributes in to the view 7787 * root. 7788 */ 7789 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7790 performCollectViewAttributes(attachInfo, visibility); 7791 } 7792 7793 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7794 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7795 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7796 attachInfo.mKeepScreenOn = true; 7797 } 7798 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7799 ListenerInfo li = mListenerInfo; 7800 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7801 attachInfo.mHasSystemUiListeners = true; 7802 } 7803 } 7804 } 7805 7806 void needGlobalAttributesUpdate(boolean force) { 7807 final AttachInfo ai = mAttachInfo; 7808 if (ai != null && !ai.mRecomputeGlobalAttributes) { 7809 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7810 || ai.mHasSystemUiListeners) { 7811 ai.mRecomputeGlobalAttributes = true; 7812 } 7813 } 7814 } 7815 7816 /** 7817 * Returns whether the device is currently in touch mode. Touch mode is entered 7818 * once the user begins interacting with the device by touch, and affects various 7819 * things like whether focus is always visible to the user. 7820 * 7821 * @return Whether the device is in touch mode. 7822 */ 7823 @ViewDebug.ExportedProperty 7824 public boolean isInTouchMode() { 7825 if (mAttachInfo != null) { 7826 return mAttachInfo.mInTouchMode; 7827 } else { 7828 return ViewRootImpl.isInTouchMode(); 7829 } 7830 } 7831 7832 /** 7833 * Returns the context the view is running in, through which it can 7834 * access the current theme, resources, etc. 7835 * 7836 * @return The view's Context. 7837 */ 7838 @ViewDebug.CapturedViewProperty 7839 public final Context getContext() { 7840 return mContext; 7841 } 7842 7843 /** 7844 * Handle a key event before it is processed by any input method 7845 * associated with the view hierarchy. This can be used to intercept 7846 * key events in special situations before the IME consumes them; a 7847 * typical example would be handling the BACK key to update the application's 7848 * UI instead of allowing the IME to see it and close itself. 7849 * 7850 * @param keyCode The value in event.getKeyCode(). 7851 * @param event Description of the key event. 7852 * @return If you handled the event, return true. If you want to allow the 7853 * event to be handled by the next receiver, return false. 7854 */ 7855 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7856 return false; 7857 } 7858 7859 /** 7860 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7861 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7862 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7863 * is released, if the view is enabled and clickable. 7864 * 7865 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7866 * although some may elect to do so in some situations. Do not rely on this to 7867 * catch software key presses. 7868 * 7869 * @param keyCode A key code that represents the button pressed, from 7870 * {@link android.view.KeyEvent}. 7871 * @param event The KeyEvent object that defines the button action. 7872 */ 7873 public boolean onKeyDown(int keyCode, KeyEvent event) { 7874 boolean result = false; 7875 7876 switch (keyCode) { 7877 case KeyEvent.KEYCODE_DPAD_CENTER: 7878 case KeyEvent.KEYCODE_ENTER: { 7879 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7880 return true; 7881 } 7882 // Long clickable items don't necessarily have to be clickable 7883 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7884 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7885 (event.getRepeatCount() == 0)) { 7886 setPressed(true); 7887 checkForLongClick(0); 7888 return true; 7889 } 7890 break; 7891 } 7892 } 7893 return result; 7894 } 7895 7896 /** 7897 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7898 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7899 * the event). 7900 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7901 * although some may elect to do so in some situations. Do not rely on this to 7902 * catch software key presses. 7903 */ 7904 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7905 return false; 7906 } 7907 7908 /** 7909 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7910 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7911 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7912 * {@link KeyEvent#KEYCODE_ENTER} is released. 7913 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7914 * although some may elect to do so in some situations. Do not rely on this to 7915 * catch software key presses. 7916 * 7917 * @param keyCode A key code that represents the button pressed, from 7918 * {@link android.view.KeyEvent}. 7919 * @param event The KeyEvent object that defines the button action. 7920 */ 7921 public boolean onKeyUp(int keyCode, KeyEvent event) { 7922 boolean result = false; 7923 7924 switch (keyCode) { 7925 case KeyEvent.KEYCODE_DPAD_CENTER: 7926 case KeyEvent.KEYCODE_ENTER: { 7927 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7928 return true; 7929 } 7930 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7931 setPressed(false); 7932 7933 if (!mHasPerformedLongPress) { 7934 // This is a tap, so remove the longpress check 7935 removeLongPressCallback(); 7936 7937 result = performClick(); 7938 } 7939 } 7940 break; 7941 } 7942 } 7943 return result; 7944 } 7945 7946 /** 7947 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7948 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7949 * the event). 7950 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7951 * although some may elect to do so in some situations. Do not rely on this to 7952 * catch software key presses. 7953 * 7954 * @param keyCode A key code that represents the button pressed, from 7955 * {@link android.view.KeyEvent}. 7956 * @param repeatCount The number of times the action was made. 7957 * @param event The KeyEvent object that defines the button action. 7958 */ 7959 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7960 return false; 7961 } 7962 7963 /** 7964 * Called on the focused view when a key shortcut event is not handled. 7965 * Override this method to implement local key shortcuts for the View. 7966 * Key shortcuts can also be implemented by setting the 7967 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7968 * 7969 * @param keyCode The value in event.getKeyCode(). 7970 * @param event Description of the key event. 7971 * @return If you handled the event, return true. If you want to allow the 7972 * event to be handled by the next receiver, return false. 7973 */ 7974 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7975 return false; 7976 } 7977 7978 /** 7979 * Check whether the called view is a text editor, in which case it 7980 * would make sense to automatically display a soft input window for 7981 * it. Subclasses should override this if they implement 7982 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7983 * a call on that method would return a non-null InputConnection, and 7984 * they are really a first-class editor that the user would normally 7985 * start typing on when the go into a window containing your view. 7986 * 7987 * <p>The default implementation always returns false. This does 7988 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7989 * will not be called or the user can not otherwise perform edits on your 7990 * view; it is just a hint to the system that this is not the primary 7991 * purpose of this view. 7992 * 7993 * @return Returns true if this view is a text editor, else false. 7994 */ 7995 public boolean onCheckIsTextEditor() { 7996 return false; 7997 } 7998 7999 /** 8000 * Create a new InputConnection for an InputMethod to interact 8001 * with the view. The default implementation returns null, since it doesn't 8002 * support input methods. You can override this to implement such support. 8003 * This is only needed for views that take focus and text input. 8004 * 8005 * <p>When implementing this, you probably also want to implement 8006 * {@link #onCheckIsTextEditor()} to indicate you will return a 8007 * non-null InputConnection. 8008 * 8009 * @param outAttrs Fill in with attribute information about the connection. 8010 */ 8011 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 8012 return null; 8013 } 8014 8015 /** 8016 * Called by the {@link android.view.inputmethod.InputMethodManager} 8017 * when a view who is not the current 8018 * input connection target is trying to make a call on the manager. The 8019 * default implementation returns false; you can override this to return 8020 * true for certain views if you are performing InputConnection proxying 8021 * to them. 8022 * @param view The View that is making the InputMethodManager call. 8023 * @return Return true to allow the call, false to reject. 8024 */ 8025 public boolean checkInputConnectionProxy(View view) { 8026 return false; 8027 } 8028 8029 /** 8030 * Show the context menu for this view. It is not safe to hold on to the 8031 * menu after returning from this method. 8032 * 8033 * You should normally not overload this method. Overload 8034 * {@link #onCreateContextMenu(ContextMenu)} or define an 8035 * {@link OnCreateContextMenuListener} to add items to the context menu. 8036 * 8037 * @param menu The context menu to populate 8038 */ 8039 public void createContextMenu(ContextMenu menu) { 8040 ContextMenuInfo menuInfo = getContextMenuInfo(); 8041 8042 // Sets the current menu info so all items added to menu will have 8043 // my extra info set. 8044 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 8045 8046 onCreateContextMenu(menu); 8047 ListenerInfo li = mListenerInfo; 8048 if (li != null && li.mOnCreateContextMenuListener != null) { 8049 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 8050 } 8051 8052 // Clear the extra information so subsequent items that aren't mine don't 8053 // have my extra info. 8054 ((MenuBuilder)menu).setCurrentMenuInfo(null); 8055 8056 if (mParent != null) { 8057 mParent.createContextMenu(menu); 8058 } 8059 } 8060 8061 /** 8062 * Views should implement this if they have extra information to associate 8063 * with the context menu. The return result is supplied as a parameter to 8064 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 8065 * callback. 8066 * 8067 * @return Extra information about the item for which the context menu 8068 * should be shown. This information will vary across different 8069 * subclasses of View. 8070 */ 8071 protected ContextMenuInfo getContextMenuInfo() { 8072 return null; 8073 } 8074 8075 /** 8076 * Views should implement this if the view itself is going to add items to 8077 * the context menu. 8078 * 8079 * @param menu the context menu to populate 8080 */ 8081 protected void onCreateContextMenu(ContextMenu menu) { 8082 } 8083 8084 /** 8085 * Implement this method to handle trackball motion events. The 8086 * <em>relative</em> movement of the trackball since the last event 8087 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 8088 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 8089 * that a movement of 1 corresponds to the user pressing one DPAD key (so 8090 * they will often be fractional values, representing the more fine-grained 8091 * movement information available from a trackball). 8092 * 8093 * @param event The motion event. 8094 * @return True if the event was handled, false otherwise. 8095 */ 8096 public boolean onTrackballEvent(MotionEvent event) { 8097 return false; 8098 } 8099 8100 /** 8101 * Implement this method to handle generic motion events. 8102 * <p> 8103 * Generic motion events describe joystick movements, mouse hovers, track pad 8104 * touches, scroll wheel movements and other input events. The 8105 * {@link MotionEvent#getSource() source} of the motion event specifies 8106 * the class of input that was received. Implementations of this method 8107 * must examine the bits in the source before processing the event. 8108 * The following code example shows how this is done. 8109 * </p><p> 8110 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8111 * are delivered to the view under the pointer. All other generic motion events are 8112 * delivered to the focused view. 8113 * </p> 8114 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 8115 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 8116 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 8117 * // process the joystick movement... 8118 * return true; 8119 * } 8120 * } 8121 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 8122 * switch (event.getAction()) { 8123 * case MotionEvent.ACTION_HOVER_MOVE: 8124 * // process the mouse hover movement... 8125 * return true; 8126 * case MotionEvent.ACTION_SCROLL: 8127 * // process the scroll wheel movement... 8128 * return true; 8129 * } 8130 * } 8131 * return super.onGenericMotionEvent(event); 8132 * }</pre> 8133 * 8134 * @param event The generic motion event being processed. 8135 * @return True if the event was handled, false otherwise. 8136 */ 8137 public boolean onGenericMotionEvent(MotionEvent event) { 8138 return false; 8139 } 8140 8141 /** 8142 * Implement this method to handle hover events. 8143 * <p> 8144 * This method is called whenever a pointer is hovering into, over, or out of the 8145 * bounds of a view and the view is not currently being touched. 8146 * Hover events are represented as pointer events with action 8147 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 8148 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 8149 * </p> 8150 * <ul> 8151 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 8152 * when the pointer enters the bounds of the view.</li> 8153 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 8154 * when the pointer has already entered the bounds of the view and has moved.</li> 8155 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 8156 * when the pointer has exited the bounds of the view or when the pointer is 8157 * about to go down due to a button click, tap, or similar user action that 8158 * causes the view to be touched.</li> 8159 * </ul> 8160 * <p> 8161 * The view should implement this method to return true to indicate that it is 8162 * handling the hover event, such as by changing its drawable state. 8163 * </p><p> 8164 * The default implementation calls {@link #setHovered} to update the hovered state 8165 * of the view when a hover enter or hover exit event is received, if the view 8166 * is enabled and is clickable. The default implementation also sends hover 8167 * accessibility events. 8168 * </p> 8169 * 8170 * @param event The motion event that describes the hover. 8171 * @return True if the view handled the hover event. 8172 * 8173 * @see #isHovered 8174 * @see #setHovered 8175 * @see #onHoverChanged 8176 */ 8177 public boolean onHoverEvent(MotionEvent event) { 8178 // The root view may receive hover (or touch) events that are outside the bounds of 8179 // the window. This code ensures that we only send accessibility events for 8180 // hovers that are actually within the bounds of the root view. 8181 final int action = event.getActionMasked(); 8182 if (!mSendingHoverAccessibilityEvents) { 8183 if ((action == MotionEvent.ACTION_HOVER_ENTER 8184 || action == MotionEvent.ACTION_HOVER_MOVE) 8185 && !hasHoveredChild() 8186 && pointInView(event.getX(), event.getY())) { 8187 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8188 mSendingHoverAccessibilityEvents = true; 8189 } 8190 } else { 8191 if (action == MotionEvent.ACTION_HOVER_EXIT 8192 || (action == MotionEvent.ACTION_MOVE 8193 && !pointInView(event.getX(), event.getY()))) { 8194 mSendingHoverAccessibilityEvents = false; 8195 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8196 // If the window does not have input focus we take away accessibility 8197 // focus as soon as the user stop hovering over the view. 8198 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8199 getViewRootImpl().setAccessibilityFocus(null, null); 8200 } 8201 } 8202 } 8203 8204 if (isHoverable()) { 8205 switch (action) { 8206 case MotionEvent.ACTION_HOVER_ENTER: 8207 setHovered(true); 8208 break; 8209 case MotionEvent.ACTION_HOVER_EXIT: 8210 setHovered(false); 8211 break; 8212 } 8213 8214 // Dispatch the event to onGenericMotionEvent before returning true. 8215 // This is to provide compatibility with existing applications that 8216 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8217 // break because of the new default handling for hoverable views 8218 // in onHoverEvent. 8219 // Note that onGenericMotionEvent will be called by default when 8220 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8221 return dispatchGenericMotionEventInternal(event); 8222 } 8223 8224 return false; 8225 } 8226 8227 /** 8228 * Returns true if the view should handle {@link #onHoverEvent} 8229 * by calling {@link #setHovered} to change its hovered state. 8230 * 8231 * @return True if the view is hoverable. 8232 */ 8233 private boolean isHoverable() { 8234 final int viewFlags = mViewFlags; 8235 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8236 return false; 8237 } 8238 8239 return (viewFlags & CLICKABLE) == CLICKABLE 8240 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8241 } 8242 8243 /** 8244 * Returns true if the view is currently hovered. 8245 * 8246 * @return True if the view is currently hovered. 8247 * 8248 * @see #setHovered 8249 * @see #onHoverChanged 8250 */ 8251 @ViewDebug.ExportedProperty 8252 public boolean isHovered() { 8253 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8254 } 8255 8256 /** 8257 * Sets whether the view is currently hovered. 8258 * <p> 8259 * Calling this method also changes the drawable state of the view. This 8260 * enables the view to react to hover by using different drawable resources 8261 * to change its appearance. 8262 * </p><p> 8263 * The {@link #onHoverChanged} method is called when the hovered state changes. 8264 * </p> 8265 * 8266 * @param hovered True if the view is hovered. 8267 * 8268 * @see #isHovered 8269 * @see #onHoverChanged 8270 */ 8271 public void setHovered(boolean hovered) { 8272 if (hovered) { 8273 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8274 mPrivateFlags |= PFLAG_HOVERED; 8275 refreshDrawableState(); 8276 onHoverChanged(true); 8277 } 8278 } else { 8279 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8280 mPrivateFlags &= ~PFLAG_HOVERED; 8281 refreshDrawableState(); 8282 onHoverChanged(false); 8283 } 8284 } 8285 } 8286 8287 /** 8288 * Implement this method to handle hover state changes. 8289 * <p> 8290 * This method is called whenever the hover state changes as a result of a 8291 * call to {@link #setHovered}. 8292 * </p> 8293 * 8294 * @param hovered The current hover state, as returned by {@link #isHovered}. 8295 * 8296 * @see #isHovered 8297 * @see #setHovered 8298 */ 8299 public void onHoverChanged(boolean hovered) { 8300 } 8301 8302 /** 8303 * Implement this method to handle touch screen motion events. 8304 * 8305 * @param event The motion event. 8306 * @return True if the event was handled, false otherwise. 8307 */ 8308 public boolean onTouchEvent(MotionEvent event) { 8309 final int viewFlags = mViewFlags; 8310 8311 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8312 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8313 setPressed(false); 8314 } 8315 // A disabled view that is clickable still consumes the touch 8316 // events, it just doesn't respond to them. 8317 return (((viewFlags & CLICKABLE) == CLICKABLE || 8318 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8319 } 8320 8321 if (mTouchDelegate != null) { 8322 if (mTouchDelegate.onTouchEvent(event)) { 8323 return true; 8324 } 8325 } 8326 8327 if (((viewFlags & CLICKABLE) == CLICKABLE || 8328 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8329 switch (event.getAction()) { 8330 case MotionEvent.ACTION_UP: 8331 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8332 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8333 // take focus if we don't have it already and we should in 8334 // touch mode. 8335 boolean focusTaken = false; 8336 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8337 focusTaken = requestFocus(); 8338 } 8339 8340 if (prepressed) { 8341 // The button is being released before we actually 8342 // showed it as pressed. Make it show the pressed 8343 // state now (before scheduling the click) to ensure 8344 // the user sees it. 8345 setPressed(true); 8346 } 8347 8348 if (!mHasPerformedLongPress) { 8349 // This is a tap, so remove the longpress check 8350 removeLongPressCallback(); 8351 8352 // Only perform take click actions if we were in the pressed state 8353 if (!focusTaken) { 8354 // Use a Runnable and post this rather than calling 8355 // performClick directly. This lets other visual state 8356 // of the view update before click actions start. 8357 if (mPerformClick == null) { 8358 mPerformClick = new PerformClick(); 8359 } 8360 if (!post(mPerformClick)) { 8361 performClick(); 8362 } 8363 } 8364 } 8365 8366 if (mUnsetPressedState == null) { 8367 mUnsetPressedState = new UnsetPressedState(); 8368 } 8369 8370 if (prepressed) { 8371 postDelayed(mUnsetPressedState, 8372 ViewConfiguration.getPressedStateDuration()); 8373 } else if (!post(mUnsetPressedState)) { 8374 // If the post failed, unpress right now 8375 mUnsetPressedState.run(); 8376 } 8377 removeTapCallback(); 8378 } 8379 break; 8380 8381 case MotionEvent.ACTION_DOWN: 8382 mHasPerformedLongPress = false; 8383 8384 if (performButtonActionOnTouchDown(event)) { 8385 break; 8386 } 8387 8388 // Walk up the hierarchy to determine if we're inside a scrolling container. 8389 boolean isInScrollingContainer = isInScrollingContainer(); 8390 8391 // For views inside a scrolling container, delay the pressed feedback for 8392 // a short period in case this is a scroll. 8393 if (isInScrollingContainer) { 8394 mPrivateFlags |= PFLAG_PREPRESSED; 8395 if (mPendingCheckForTap == null) { 8396 mPendingCheckForTap = new CheckForTap(); 8397 } 8398 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8399 } else { 8400 // Not inside a scrolling container, so show the feedback right away 8401 setPressed(true); 8402 checkForLongClick(0); 8403 } 8404 break; 8405 8406 case MotionEvent.ACTION_CANCEL: 8407 setPressed(false); 8408 removeTapCallback(); 8409 removeLongPressCallback(); 8410 break; 8411 8412 case MotionEvent.ACTION_MOVE: 8413 final int x = (int) event.getX(); 8414 final int y = (int) event.getY(); 8415 8416 // Be lenient about moving outside of buttons 8417 if (!pointInView(x, y, mTouchSlop)) { 8418 // Outside button 8419 removeTapCallback(); 8420 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8421 // Remove any future long press/tap checks 8422 removeLongPressCallback(); 8423 8424 setPressed(false); 8425 } 8426 } 8427 break; 8428 } 8429 return true; 8430 } 8431 8432 return false; 8433 } 8434 8435 /** 8436 * @hide 8437 */ 8438 public boolean isInScrollingContainer() { 8439 ViewParent p = getParent(); 8440 while (p != null && p instanceof ViewGroup) { 8441 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8442 return true; 8443 } 8444 p = p.getParent(); 8445 } 8446 return false; 8447 } 8448 8449 /** 8450 * Remove the longpress detection timer. 8451 */ 8452 private void removeLongPressCallback() { 8453 if (mPendingCheckForLongPress != null) { 8454 removeCallbacks(mPendingCheckForLongPress); 8455 } 8456 } 8457 8458 /** 8459 * Remove the pending click action 8460 */ 8461 private void removePerformClickCallback() { 8462 if (mPerformClick != null) { 8463 removeCallbacks(mPerformClick); 8464 } 8465 } 8466 8467 /** 8468 * Remove the prepress detection timer. 8469 */ 8470 private void removeUnsetPressCallback() { 8471 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8472 setPressed(false); 8473 removeCallbacks(mUnsetPressedState); 8474 } 8475 } 8476 8477 /** 8478 * Remove the tap detection timer. 8479 */ 8480 private void removeTapCallback() { 8481 if (mPendingCheckForTap != null) { 8482 mPrivateFlags &= ~PFLAG_PREPRESSED; 8483 removeCallbacks(mPendingCheckForTap); 8484 } 8485 } 8486 8487 /** 8488 * Cancels a pending long press. Your subclass can use this if you 8489 * want the context menu to come up if the user presses and holds 8490 * at the same place, but you don't want it to come up if they press 8491 * and then move around enough to cause scrolling. 8492 */ 8493 public void cancelLongPress() { 8494 removeLongPressCallback(); 8495 8496 /* 8497 * The prepressed state handled by the tap callback is a display 8498 * construct, but the tap callback will post a long press callback 8499 * less its own timeout. Remove it here. 8500 */ 8501 removeTapCallback(); 8502 } 8503 8504 /** 8505 * Remove the pending callback for sending a 8506 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8507 */ 8508 private void removeSendViewScrolledAccessibilityEventCallback() { 8509 if (mSendViewScrolledAccessibilityEvent != null) { 8510 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8511 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8512 } 8513 } 8514 8515 /** 8516 * Sets the TouchDelegate for this View. 8517 */ 8518 public void setTouchDelegate(TouchDelegate delegate) { 8519 mTouchDelegate = delegate; 8520 } 8521 8522 /** 8523 * Gets the TouchDelegate for this View. 8524 */ 8525 public TouchDelegate getTouchDelegate() { 8526 return mTouchDelegate; 8527 } 8528 8529 /** 8530 * Set flags controlling behavior of this view. 8531 * 8532 * @param flags Constant indicating the value which should be set 8533 * @param mask Constant indicating the bit range that should be changed 8534 */ 8535 void setFlags(int flags, int mask) { 8536 int old = mViewFlags; 8537 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8538 8539 int changed = mViewFlags ^ old; 8540 if (changed == 0) { 8541 return; 8542 } 8543 int privateFlags = mPrivateFlags; 8544 8545 /* Check if the FOCUSABLE bit has changed */ 8546 if (((changed & FOCUSABLE_MASK) != 0) && 8547 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8548 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8549 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8550 /* Give up focus if we are no longer focusable */ 8551 clearFocus(); 8552 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8553 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8554 /* 8555 * Tell the view system that we are now available to take focus 8556 * if no one else already has it. 8557 */ 8558 if (mParent != null) mParent.focusableViewAvailable(this); 8559 } 8560 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8561 notifyAccessibilityStateChanged(); 8562 } 8563 } 8564 8565 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8566 if ((changed & VISIBILITY_MASK) != 0) { 8567 /* 8568 * If this view is becoming visible, invalidate it in case it changed while 8569 * it was not visible. Marking it drawn ensures that the invalidation will 8570 * go through. 8571 */ 8572 mPrivateFlags |= PFLAG_DRAWN; 8573 invalidate(true); 8574 8575 needGlobalAttributesUpdate(true); 8576 8577 // a view becoming visible is worth notifying the parent 8578 // about in case nothing has focus. even if this specific view 8579 // isn't focusable, it may contain something that is, so let 8580 // the root view try to give this focus if nothing else does. 8581 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8582 mParent.focusableViewAvailable(this); 8583 } 8584 } 8585 } 8586 8587 /* Check if the GONE bit has changed */ 8588 if ((changed & GONE) != 0) { 8589 needGlobalAttributesUpdate(false); 8590 requestLayout(); 8591 8592 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8593 if (hasFocus()) clearFocus(); 8594 clearAccessibilityFocus(); 8595 destroyDrawingCache(); 8596 if (mParent instanceof View) { 8597 // GONE views noop invalidation, so invalidate the parent 8598 ((View) mParent).invalidate(true); 8599 } 8600 // Mark the view drawn to ensure that it gets invalidated properly the next 8601 // time it is visible and gets invalidated 8602 mPrivateFlags |= PFLAG_DRAWN; 8603 } 8604 if (mAttachInfo != null) { 8605 mAttachInfo.mViewVisibilityChanged = true; 8606 } 8607 } 8608 8609 /* Check if the VISIBLE bit has changed */ 8610 if ((changed & INVISIBLE) != 0) { 8611 needGlobalAttributesUpdate(false); 8612 /* 8613 * If this view is becoming invisible, set the DRAWN flag so that 8614 * the next invalidate() will not be skipped. 8615 */ 8616 mPrivateFlags |= PFLAG_DRAWN; 8617 8618 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8619 // root view becoming invisible shouldn't clear focus and accessibility focus 8620 if (getRootView() != this) { 8621 clearFocus(); 8622 clearAccessibilityFocus(); 8623 } 8624 } 8625 if (mAttachInfo != null) { 8626 mAttachInfo.mViewVisibilityChanged = true; 8627 } 8628 } 8629 8630 if ((changed & VISIBILITY_MASK) != 0) { 8631 if (mParent instanceof ViewGroup) { 8632 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8633 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8634 ((View) mParent).invalidate(true); 8635 } else if (mParent != null) { 8636 mParent.invalidateChild(this, null); 8637 } 8638 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8639 } 8640 8641 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8642 destroyDrawingCache(); 8643 } 8644 8645 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8646 destroyDrawingCache(); 8647 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8648 invalidateParentCaches(); 8649 } 8650 8651 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8652 destroyDrawingCache(); 8653 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8654 } 8655 8656 if ((changed & DRAW_MASK) != 0) { 8657 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8658 if (mBackground != null) { 8659 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8660 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8661 } else { 8662 mPrivateFlags |= PFLAG_SKIP_DRAW; 8663 } 8664 } else { 8665 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8666 } 8667 requestLayout(); 8668 invalidate(true); 8669 } 8670 8671 if ((changed & KEEP_SCREEN_ON) != 0) { 8672 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8673 mParent.recomputeViewAttributes(this); 8674 } 8675 } 8676 8677 if (AccessibilityManager.getInstance(mContext).isEnabled() 8678 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8679 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8680 notifyAccessibilityStateChanged(); 8681 } 8682 } 8683 8684 /** 8685 * Change the view's z order in the tree, so it's on top of other sibling 8686 * views 8687 */ 8688 public void bringToFront() { 8689 if (mParent != null) { 8690 mParent.bringChildToFront(this); 8691 } 8692 } 8693 8694 /** 8695 * This is called in response to an internal scroll in this view (i.e., the 8696 * view scrolled its own contents). This is typically as a result of 8697 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8698 * called. 8699 * 8700 * @param l Current horizontal scroll origin. 8701 * @param t Current vertical scroll origin. 8702 * @param oldl Previous horizontal scroll origin. 8703 * @param oldt Previous vertical scroll origin. 8704 */ 8705 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8706 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8707 postSendViewScrolledAccessibilityEventCallback(); 8708 } 8709 8710 mBackgroundSizeChanged = true; 8711 8712 final AttachInfo ai = mAttachInfo; 8713 if (ai != null) { 8714 ai.mViewScrollChanged = true; 8715 } 8716 } 8717 8718 /** 8719 * Interface definition for a callback to be invoked when the layout bounds of a view 8720 * changes due to layout processing. 8721 */ 8722 public interface OnLayoutChangeListener { 8723 /** 8724 * Called when the focus state of a view has changed. 8725 * 8726 * @param v The view whose state has changed. 8727 * @param left The new value of the view's left property. 8728 * @param top The new value of the view's top property. 8729 * @param right The new value of the view's right property. 8730 * @param bottom The new value of the view's bottom property. 8731 * @param oldLeft The previous value of the view's left property. 8732 * @param oldTop The previous value of the view's top property. 8733 * @param oldRight The previous value of the view's right property. 8734 * @param oldBottom The previous value of the view's bottom property. 8735 */ 8736 void onLayoutChange(View v, int left, int top, int right, int bottom, 8737 int oldLeft, int oldTop, int oldRight, int oldBottom); 8738 } 8739 8740 /** 8741 * This is called during layout when the size of this view has changed. If 8742 * you were just added to the view hierarchy, you're called with the old 8743 * values of 0. 8744 * 8745 * @param w Current width of this view. 8746 * @param h Current height of this view. 8747 * @param oldw Old width of this view. 8748 * @param oldh Old height of this view. 8749 */ 8750 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8751 } 8752 8753 /** 8754 * Called by draw to draw the child views. This may be overridden 8755 * by derived classes to gain control just before its children are drawn 8756 * (but after its own view has been drawn). 8757 * @param canvas the canvas on which to draw the view 8758 */ 8759 protected void dispatchDraw(Canvas canvas) { 8760 8761 } 8762 8763 /** 8764 * Gets the parent of this view. Note that the parent is a 8765 * ViewParent and not necessarily a View. 8766 * 8767 * @return Parent of this view. 8768 */ 8769 public final ViewParent getParent() { 8770 return mParent; 8771 } 8772 8773 /** 8774 * Set the horizontal scrolled position of your view. This will cause a call to 8775 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8776 * invalidated. 8777 * @param value the x position to scroll to 8778 */ 8779 public void setScrollX(int value) { 8780 scrollTo(value, mScrollY); 8781 } 8782 8783 /** 8784 * Set the vertical scrolled position of your view. This will cause a call to 8785 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8786 * invalidated. 8787 * @param value the y position to scroll to 8788 */ 8789 public void setScrollY(int value) { 8790 scrollTo(mScrollX, value); 8791 } 8792 8793 /** 8794 * Return the scrolled left position of this view. This is the left edge of 8795 * the displayed part of your view. You do not need to draw any pixels 8796 * farther left, since those are outside of the frame of your view on 8797 * screen. 8798 * 8799 * @return The left edge of the displayed part of your view, in pixels. 8800 */ 8801 public final int getScrollX() { 8802 return mScrollX; 8803 } 8804 8805 /** 8806 * Return the scrolled top position of this view. This is the top edge of 8807 * the displayed part of your view. You do not need to draw any pixels above 8808 * it, since those are outside of the frame of your view on screen. 8809 * 8810 * @return The top edge of the displayed part of your view, in pixels. 8811 */ 8812 public final int getScrollY() { 8813 return mScrollY; 8814 } 8815 8816 /** 8817 * Return the width of the your view. 8818 * 8819 * @return The width of your view, in pixels. 8820 */ 8821 @ViewDebug.ExportedProperty(category = "layout") 8822 public final int getWidth() { 8823 return mRight - mLeft; 8824 } 8825 8826 /** 8827 * Return the height of your view. 8828 * 8829 * @return The height of your view, in pixels. 8830 */ 8831 @ViewDebug.ExportedProperty(category = "layout") 8832 public final int getHeight() { 8833 return mBottom - mTop; 8834 } 8835 8836 /** 8837 * Return the visible drawing bounds of your view. Fills in the output 8838 * rectangle with the values from getScrollX(), getScrollY(), 8839 * getWidth(), and getHeight(). These bounds do not account for any 8840 * transformation properties currently set on the view, such as 8841 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 8842 * 8843 * @param outRect The (scrolled) drawing bounds of the view. 8844 */ 8845 public void getDrawingRect(Rect outRect) { 8846 outRect.left = mScrollX; 8847 outRect.top = mScrollY; 8848 outRect.right = mScrollX + (mRight - mLeft); 8849 outRect.bottom = mScrollY + (mBottom - mTop); 8850 } 8851 8852 /** 8853 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8854 * raw width component (that is the result is masked by 8855 * {@link #MEASURED_SIZE_MASK}). 8856 * 8857 * @return The raw measured width of this view. 8858 */ 8859 public final int getMeasuredWidth() { 8860 return mMeasuredWidth & MEASURED_SIZE_MASK; 8861 } 8862 8863 /** 8864 * Return the full width measurement information for this view as computed 8865 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8866 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8867 * This should be used during measurement and layout calculations only. Use 8868 * {@link #getWidth()} to see how wide a view is after layout. 8869 * 8870 * @return The measured width of this view as a bit mask. 8871 */ 8872 public final int getMeasuredWidthAndState() { 8873 return mMeasuredWidth; 8874 } 8875 8876 /** 8877 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8878 * raw width component (that is the result is masked by 8879 * {@link #MEASURED_SIZE_MASK}). 8880 * 8881 * @return The raw measured height of this view. 8882 */ 8883 public final int getMeasuredHeight() { 8884 return mMeasuredHeight & MEASURED_SIZE_MASK; 8885 } 8886 8887 /** 8888 * Return the full height measurement information for this view as computed 8889 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8890 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8891 * This should be used during measurement and layout calculations only. Use 8892 * {@link #getHeight()} to see how wide a view is after layout. 8893 * 8894 * @return The measured width of this view as a bit mask. 8895 */ 8896 public final int getMeasuredHeightAndState() { 8897 return mMeasuredHeight; 8898 } 8899 8900 /** 8901 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8902 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8903 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8904 * and the height component is at the shifted bits 8905 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8906 */ 8907 public final int getMeasuredState() { 8908 return (mMeasuredWidth&MEASURED_STATE_MASK) 8909 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8910 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8911 } 8912 8913 /** 8914 * The transform matrix of this view, which is calculated based on the current 8915 * roation, scale, and pivot properties. 8916 * 8917 * @see #getRotation() 8918 * @see #getScaleX() 8919 * @see #getScaleY() 8920 * @see #getPivotX() 8921 * @see #getPivotY() 8922 * @return The current transform matrix for the view 8923 */ 8924 public Matrix getMatrix() { 8925 if (mTransformationInfo != null) { 8926 updateMatrix(); 8927 return mTransformationInfo.mMatrix; 8928 } 8929 return Matrix.IDENTITY_MATRIX; 8930 } 8931 8932 /** 8933 * Utility function to determine if the value is far enough away from zero to be 8934 * considered non-zero. 8935 * @param value A floating point value to check for zero-ness 8936 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8937 */ 8938 private static boolean nonzero(float value) { 8939 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8940 } 8941 8942 /** 8943 * Returns true if the transform matrix is the identity matrix. 8944 * Recomputes the matrix if necessary. 8945 * 8946 * @return True if the transform matrix is the identity matrix, false otherwise. 8947 */ 8948 final boolean hasIdentityMatrix() { 8949 if (mTransformationInfo != null) { 8950 updateMatrix(); 8951 return mTransformationInfo.mMatrixIsIdentity; 8952 } 8953 return true; 8954 } 8955 8956 void ensureTransformationInfo() { 8957 if (mTransformationInfo == null) { 8958 mTransformationInfo = new TransformationInfo(); 8959 } 8960 } 8961 8962 /** 8963 * Recomputes the transform matrix if necessary. 8964 */ 8965 private void updateMatrix() { 8966 final TransformationInfo info = mTransformationInfo; 8967 if (info == null) { 8968 return; 8969 } 8970 if (info.mMatrixDirty) { 8971 // transform-related properties have changed since the last time someone 8972 // asked for the matrix; recalculate it with the current values 8973 8974 // Figure out if we need to update the pivot point 8975 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 8976 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8977 info.mPrevWidth = mRight - mLeft; 8978 info.mPrevHeight = mBottom - mTop; 8979 info.mPivotX = info.mPrevWidth / 2f; 8980 info.mPivotY = info.mPrevHeight / 2f; 8981 } 8982 } 8983 info.mMatrix.reset(); 8984 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8985 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8986 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8987 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8988 } else { 8989 if (info.mCamera == null) { 8990 info.mCamera = new Camera(); 8991 info.matrix3D = new Matrix(); 8992 } 8993 info.mCamera.save(); 8994 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8995 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8996 info.mCamera.getMatrix(info.matrix3D); 8997 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8998 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8999 info.mPivotY + info.mTranslationY); 9000 info.mMatrix.postConcat(info.matrix3D); 9001 info.mCamera.restore(); 9002 } 9003 info.mMatrixDirty = false; 9004 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 9005 info.mInverseMatrixDirty = true; 9006 } 9007 } 9008 9009 /** 9010 * Utility method to retrieve the inverse of the current mMatrix property. 9011 * We cache the matrix to avoid recalculating it when transform properties 9012 * have not changed. 9013 * 9014 * @return The inverse of the current matrix of this view. 9015 */ 9016 final Matrix getInverseMatrix() { 9017 final TransformationInfo info = mTransformationInfo; 9018 if (info != null) { 9019 updateMatrix(); 9020 if (info.mInverseMatrixDirty) { 9021 if (info.mInverseMatrix == null) { 9022 info.mInverseMatrix = new Matrix(); 9023 } 9024 info.mMatrix.invert(info.mInverseMatrix); 9025 info.mInverseMatrixDirty = false; 9026 } 9027 return info.mInverseMatrix; 9028 } 9029 return Matrix.IDENTITY_MATRIX; 9030 } 9031 9032 /** 9033 * Gets the distance along the Z axis from the camera to this view. 9034 * 9035 * @see #setCameraDistance(float) 9036 * 9037 * @return The distance along the Z axis. 9038 */ 9039 public float getCameraDistance() { 9040 ensureTransformationInfo(); 9041 final float dpi = mResources.getDisplayMetrics().densityDpi; 9042 final TransformationInfo info = mTransformationInfo; 9043 if (info.mCamera == null) { 9044 info.mCamera = new Camera(); 9045 info.matrix3D = new Matrix(); 9046 } 9047 return -(info.mCamera.getLocationZ() * dpi); 9048 } 9049 9050 /** 9051 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 9052 * views are drawn) from the camera to this view. The camera's distance 9053 * affects 3D transformations, for instance rotations around the X and Y 9054 * axis. If the rotationX or rotationY properties are changed and this view is 9055 * large (more than half the size of the screen), it is recommended to always 9056 * use a camera distance that's greater than the height (X axis rotation) or 9057 * the width (Y axis rotation) of this view.</p> 9058 * 9059 * <p>The distance of the camera from the view plane can have an affect on the 9060 * perspective distortion of the view when it is rotated around the x or y axis. 9061 * For example, a large distance will result in a large viewing angle, and there 9062 * will not be much perspective distortion of the view as it rotates. A short 9063 * distance may cause much more perspective distortion upon rotation, and can 9064 * also result in some drawing artifacts if the rotated view ends up partially 9065 * behind the camera (which is why the recommendation is to use a distance at 9066 * least as far as the size of the view, if the view is to be rotated.)</p> 9067 * 9068 * <p>The distance is expressed in "depth pixels." The default distance depends 9069 * on the screen density. For instance, on a medium density display, the 9070 * default distance is 1280. On a high density display, the default distance 9071 * is 1920.</p> 9072 * 9073 * <p>If you want to specify a distance that leads to visually consistent 9074 * results across various densities, use the following formula:</p> 9075 * <pre> 9076 * float scale = context.getResources().getDisplayMetrics().density; 9077 * view.setCameraDistance(distance * scale); 9078 * </pre> 9079 * 9080 * <p>The density scale factor of a high density display is 1.5, 9081 * and 1920 = 1280 * 1.5.</p> 9082 * 9083 * @param distance The distance in "depth pixels", if negative the opposite 9084 * value is used 9085 * 9086 * @see #setRotationX(float) 9087 * @see #setRotationY(float) 9088 */ 9089 public void setCameraDistance(float distance) { 9090 invalidateViewProperty(true, false); 9091 9092 ensureTransformationInfo(); 9093 final float dpi = mResources.getDisplayMetrics().densityDpi; 9094 final TransformationInfo info = mTransformationInfo; 9095 if (info.mCamera == null) { 9096 info.mCamera = new Camera(); 9097 info.matrix3D = new Matrix(); 9098 } 9099 9100 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 9101 info.mMatrixDirty = true; 9102 9103 invalidateViewProperty(false, false); 9104 if (mDisplayList != null) { 9105 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 9106 } 9107 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9108 // View was rejected last time it was drawn by its parent; this may have changed 9109 invalidateParentIfNeeded(); 9110 } 9111 } 9112 9113 /** 9114 * The degrees that the view is rotated around the pivot point. 9115 * 9116 * @see #setRotation(float) 9117 * @see #getPivotX() 9118 * @see #getPivotY() 9119 * 9120 * @return The degrees of rotation. 9121 */ 9122 @ViewDebug.ExportedProperty(category = "drawing") 9123 public float getRotation() { 9124 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 9125 } 9126 9127 /** 9128 * Sets the degrees that the view is rotated around the pivot point. Increasing values 9129 * result in clockwise rotation. 9130 * 9131 * @param rotation The degrees of rotation. 9132 * 9133 * @see #getRotation() 9134 * @see #getPivotX() 9135 * @see #getPivotY() 9136 * @see #setRotationX(float) 9137 * @see #setRotationY(float) 9138 * 9139 * @attr ref android.R.styleable#View_rotation 9140 */ 9141 public void setRotation(float rotation) { 9142 ensureTransformationInfo(); 9143 final TransformationInfo info = mTransformationInfo; 9144 if (info.mRotation != rotation) { 9145 // Double-invalidation is necessary to capture view's old and new areas 9146 invalidateViewProperty(true, false); 9147 info.mRotation = rotation; 9148 info.mMatrixDirty = true; 9149 invalidateViewProperty(false, true); 9150 if (mDisplayList != null) { 9151 mDisplayList.setRotation(rotation); 9152 } 9153 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9154 // View was rejected last time it was drawn by its parent; this may have changed 9155 invalidateParentIfNeeded(); 9156 } 9157 } 9158 } 9159 9160 /** 9161 * The degrees that the view is rotated around the vertical axis through the pivot point. 9162 * 9163 * @see #getPivotX() 9164 * @see #getPivotY() 9165 * @see #setRotationY(float) 9166 * 9167 * @return The degrees of Y rotation. 9168 */ 9169 @ViewDebug.ExportedProperty(category = "drawing") 9170 public float getRotationY() { 9171 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 9172 } 9173 9174 /** 9175 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9176 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9177 * down the y axis. 9178 * 9179 * When rotating large views, it is recommended to adjust the camera distance 9180 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9181 * 9182 * @param rotationY The degrees of Y rotation. 9183 * 9184 * @see #getRotationY() 9185 * @see #getPivotX() 9186 * @see #getPivotY() 9187 * @see #setRotation(float) 9188 * @see #setRotationX(float) 9189 * @see #setCameraDistance(float) 9190 * 9191 * @attr ref android.R.styleable#View_rotationY 9192 */ 9193 public void setRotationY(float rotationY) { 9194 ensureTransformationInfo(); 9195 final TransformationInfo info = mTransformationInfo; 9196 if (info.mRotationY != rotationY) { 9197 invalidateViewProperty(true, false); 9198 info.mRotationY = rotationY; 9199 info.mMatrixDirty = true; 9200 invalidateViewProperty(false, true); 9201 if (mDisplayList != null) { 9202 mDisplayList.setRotationY(rotationY); 9203 } 9204 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9205 // View was rejected last time it was drawn by its parent; this may have changed 9206 invalidateParentIfNeeded(); 9207 } 9208 } 9209 } 9210 9211 /** 9212 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9213 * 9214 * @see #getPivotX() 9215 * @see #getPivotY() 9216 * @see #setRotationX(float) 9217 * 9218 * @return The degrees of X rotation. 9219 */ 9220 @ViewDebug.ExportedProperty(category = "drawing") 9221 public float getRotationX() { 9222 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9223 } 9224 9225 /** 9226 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9227 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9228 * x axis. 9229 * 9230 * When rotating large views, it is recommended to adjust the camera distance 9231 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9232 * 9233 * @param rotationX The degrees of X rotation. 9234 * 9235 * @see #getRotationX() 9236 * @see #getPivotX() 9237 * @see #getPivotY() 9238 * @see #setRotation(float) 9239 * @see #setRotationY(float) 9240 * @see #setCameraDistance(float) 9241 * 9242 * @attr ref android.R.styleable#View_rotationX 9243 */ 9244 public void setRotationX(float rotationX) { 9245 ensureTransformationInfo(); 9246 final TransformationInfo info = mTransformationInfo; 9247 if (info.mRotationX != rotationX) { 9248 invalidateViewProperty(true, false); 9249 info.mRotationX = rotationX; 9250 info.mMatrixDirty = true; 9251 invalidateViewProperty(false, true); 9252 if (mDisplayList != null) { 9253 mDisplayList.setRotationX(rotationX); 9254 } 9255 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9256 // View was rejected last time it was drawn by its parent; this may have changed 9257 invalidateParentIfNeeded(); 9258 } 9259 } 9260 } 9261 9262 /** 9263 * The amount that the view is scaled in x around the pivot point, as a proportion of 9264 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9265 * 9266 * <p>By default, this is 1.0f. 9267 * 9268 * @see #getPivotX() 9269 * @see #getPivotY() 9270 * @return The scaling factor. 9271 */ 9272 @ViewDebug.ExportedProperty(category = "drawing") 9273 public float getScaleX() { 9274 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9275 } 9276 9277 /** 9278 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9279 * the view's unscaled width. A value of 1 means that no scaling is applied. 9280 * 9281 * @param scaleX The scaling factor. 9282 * @see #getPivotX() 9283 * @see #getPivotY() 9284 * 9285 * @attr ref android.R.styleable#View_scaleX 9286 */ 9287 public void setScaleX(float scaleX) { 9288 ensureTransformationInfo(); 9289 final TransformationInfo info = mTransformationInfo; 9290 if (info.mScaleX != scaleX) { 9291 invalidateViewProperty(true, false); 9292 info.mScaleX = scaleX; 9293 info.mMatrixDirty = true; 9294 invalidateViewProperty(false, true); 9295 if (mDisplayList != null) { 9296 mDisplayList.setScaleX(scaleX); 9297 } 9298 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9299 // View was rejected last time it was drawn by its parent; this may have changed 9300 invalidateParentIfNeeded(); 9301 } 9302 } 9303 } 9304 9305 /** 9306 * The amount that the view is scaled in y around the pivot point, as a proportion of 9307 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9308 * 9309 * <p>By default, this is 1.0f. 9310 * 9311 * @see #getPivotX() 9312 * @see #getPivotY() 9313 * @return The scaling factor. 9314 */ 9315 @ViewDebug.ExportedProperty(category = "drawing") 9316 public float getScaleY() { 9317 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9318 } 9319 9320 /** 9321 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9322 * the view's unscaled width. A value of 1 means that no scaling is applied. 9323 * 9324 * @param scaleY The scaling factor. 9325 * @see #getPivotX() 9326 * @see #getPivotY() 9327 * 9328 * @attr ref android.R.styleable#View_scaleY 9329 */ 9330 public void setScaleY(float scaleY) { 9331 ensureTransformationInfo(); 9332 final TransformationInfo info = mTransformationInfo; 9333 if (info.mScaleY != scaleY) { 9334 invalidateViewProperty(true, false); 9335 info.mScaleY = scaleY; 9336 info.mMatrixDirty = true; 9337 invalidateViewProperty(false, true); 9338 if (mDisplayList != null) { 9339 mDisplayList.setScaleY(scaleY); 9340 } 9341 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9342 // View was rejected last time it was drawn by its parent; this may have changed 9343 invalidateParentIfNeeded(); 9344 } 9345 } 9346 } 9347 9348 /** 9349 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9350 * and {@link #setScaleX(float) scaled}. 9351 * 9352 * @see #getRotation() 9353 * @see #getScaleX() 9354 * @see #getScaleY() 9355 * @see #getPivotY() 9356 * @return The x location of the pivot point. 9357 * 9358 * @attr ref android.R.styleable#View_transformPivotX 9359 */ 9360 @ViewDebug.ExportedProperty(category = "drawing") 9361 public float getPivotX() { 9362 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9363 } 9364 9365 /** 9366 * Sets the x location of the point around which the view is 9367 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9368 * By default, the pivot point is centered on the object. 9369 * Setting this property disables this behavior and causes the view to use only the 9370 * explicitly set pivotX and pivotY values. 9371 * 9372 * @param pivotX The x location of the pivot point. 9373 * @see #getRotation() 9374 * @see #getScaleX() 9375 * @see #getScaleY() 9376 * @see #getPivotY() 9377 * 9378 * @attr ref android.R.styleable#View_transformPivotX 9379 */ 9380 public void setPivotX(float pivotX) { 9381 ensureTransformationInfo(); 9382 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9383 final TransformationInfo info = mTransformationInfo; 9384 if (info.mPivotX != pivotX) { 9385 invalidateViewProperty(true, false); 9386 info.mPivotX = pivotX; 9387 info.mMatrixDirty = true; 9388 invalidateViewProperty(false, true); 9389 if (mDisplayList != null) { 9390 mDisplayList.setPivotX(pivotX); 9391 } 9392 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9393 // View was rejected last time it was drawn by its parent; this may have changed 9394 invalidateParentIfNeeded(); 9395 } 9396 } 9397 } 9398 9399 /** 9400 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9401 * and {@link #setScaleY(float) scaled}. 9402 * 9403 * @see #getRotation() 9404 * @see #getScaleX() 9405 * @see #getScaleY() 9406 * @see #getPivotY() 9407 * @return The y location of the pivot point. 9408 * 9409 * @attr ref android.R.styleable#View_transformPivotY 9410 */ 9411 @ViewDebug.ExportedProperty(category = "drawing") 9412 public float getPivotY() { 9413 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9414 } 9415 9416 /** 9417 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9418 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9419 * Setting this property disables this behavior and causes the view to use only the 9420 * explicitly set pivotX and pivotY values. 9421 * 9422 * @param pivotY The y location of the pivot point. 9423 * @see #getRotation() 9424 * @see #getScaleX() 9425 * @see #getScaleY() 9426 * @see #getPivotY() 9427 * 9428 * @attr ref android.R.styleable#View_transformPivotY 9429 */ 9430 public void setPivotY(float pivotY) { 9431 ensureTransformationInfo(); 9432 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9433 final TransformationInfo info = mTransformationInfo; 9434 if (info.mPivotY != pivotY) { 9435 invalidateViewProperty(true, false); 9436 info.mPivotY = pivotY; 9437 info.mMatrixDirty = true; 9438 invalidateViewProperty(false, true); 9439 if (mDisplayList != null) { 9440 mDisplayList.setPivotY(pivotY); 9441 } 9442 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9443 // View was rejected last time it was drawn by its parent; this may have changed 9444 invalidateParentIfNeeded(); 9445 } 9446 } 9447 } 9448 9449 /** 9450 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9451 * completely transparent and 1 means the view is completely opaque. 9452 * 9453 * <p>By default this is 1.0f. 9454 * @return The opacity of the view. 9455 */ 9456 @ViewDebug.ExportedProperty(category = "drawing") 9457 public float getAlpha() { 9458 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9459 } 9460 9461 /** 9462 * Returns whether this View has content which overlaps. This function, intended to be 9463 * overridden by specific View types, is an optimization when alpha is set on a view. If 9464 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 9465 * and then composited it into place, which can be expensive. If the view has no overlapping 9466 * rendering, the view can draw each primitive with the appropriate alpha value directly. 9467 * An example of overlapping rendering is a TextView with a background image, such as a 9468 * Button. An example of non-overlapping rendering is a TextView with no background, or 9469 * an ImageView with only the foreground image. The default implementation returns true; 9470 * subclasses should override if they have cases which can be optimized. 9471 * 9472 * @return true if the content in this view might overlap, false otherwise. 9473 */ 9474 public boolean hasOverlappingRendering() { 9475 return true; 9476 } 9477 9478 /** 9479 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9480 * completely transparent and 1 means the view is completely opaque.</p> 9481 * 9482 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9483 * responsible for applying the opacity itself. Otherwise, calling this method is 9484 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 9485 * setting a hardware layer.</p> 9486 * 9487 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 9488 * performance implications. It is generally best to use the alpha property sparingly and 9489 * transiently, as in the case of fading animations.</p> 9490 * 9491 * @param alpha The opacity of the view. 9492 * 9493 * @see #setLayerType(int, android.graphics.Paint) 9494 * 9495 * @attr ref android.R.styleable#View_alpha 9496 */ 9497 public void setAlpha(float alpha) { 9498 ensureTransformationInfo(); 9499 if (mTransformationInfo.mAlpha != alpha) { 9500 mTransformationInfo.mAlpha = alpha; 9501 if (onSetAlpha((int) (alpha * 255))) { 9502 mPrivateFlags |= PFLAG_ALPHA_SET; 9503 // subclass is handling alpha - don't optimize rendering cache invalidation 9504 invalidateParentCaches(); 9505 invalidate(true); 9506 } else { 9507 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9508 invalidateViewProperty(true, false); 9509 if (mDisplayList != null) { 9510 mDisplayList.setAlpha(alpha); 9511 } 9512 } 9513 } 9514 } 9515 9516 /** 9517 * Faster version of setAlpha() which performs the same steps except there are 9518 * no calls to invalidate(). The caller of this function should perform proper invalidation 9519 * on the parent and this object. The return value indicates whether the subclass handles 9520 * alpha (the return value for onSetAlpha()). 9521 * 9522 * @param alpha The new value for the alpha property 9523 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9524 * the new value for the alpha property is different from the old value 9525 */ 9526 boolean setAlphaNoInvalidation(float alpha) { 9527 ensureTransformationInfo(); 9528 if (mTransformationInfo.mAlpha != alpha) { 9529 mTransformationInfo.mAlpha = alpha; 9530 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9531 if (subclassHandlesAlpha) { 9532 mPrivateFlags |= PFLAG_ALPHA_SET; 9533 return true; 9534 } else { 9535 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9536 if (mDisplayList != null) { 9537 mDisplayList.setAlpha(alpha); 9538 } 9539 } 9540 } 9541 return false; 9542 } 9543 9544 /** 9545 * Top position of this view relative to its parent. 9546 * 9547 * @return The top of this view, in pixels. 9548 */ 9549 @ViewDebug.CapturedViewProperty 9550 public final int getTop() { 9551 return mTop; 9552 } 9553 9554 /** 9555 * Sets the top position of this view relative to its parent. This method is meant to be called 9556 * by the layout system and should not generally be called otherwise, because the property 9557 * may be changed at any time by the layout. 9558 * 9559 * @param top The top of this view, in pixels. 9560 */ 9561 public final void setTop(int top) { 9562 if (top != mTop) { 9563 updateMatrix(); 9564 final boolean matrixIsIdentity = mTransformationInfo == null 9565 || mTransformationInfo.mMatrixIsIdentity; 9566 if (matrixIsIdentity) { 9567 if (mAttachInfo != null) { 9568 int minTop; 9569 int yLoc; 9570 if (top < mTop) { 9571 minTop = top; 9572 yLoc = top - mTop; 9573 } else { 9574 minTop = mTop; 9575 yLoc = 0; 9576 } 9577 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9578 } 9579 } else { 9580 // Double-invalidation is necessary to capture view's old and new areas 9581 invalidate(true); 9582 } 9583 9584 int width = mRight - mLeft; 9585 int oldHeight = mBottom - mTop; 9586 9587 mTop = top; 9588 if (mDisplayList != null) { 9589 mDisplayList.setTop(mTop); 9590 } 9591 9592 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9593 9594 if (!matrixIsIdentity) { 9595 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9596 // A change in dimension means an auto-centered pivot point changes, too 9597 mTransformationInfo.mMatrixDirty = true; 9598 } 9599 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9600 invalidate(true); 9601 } 9602 mBackgroundSizeChanged = true; 9603 invalidateParentIfNeeded(); 9604 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9605 // View was rejected last time it was drawn by its parent; this may have changed 9606 invalidateParentIfNeeded(); 9607 } 9608 } 9609 } 9610 9611 /** 9612 * Bottom position of this view relative to its parent. 9613 * 9614 * @return The bottom of this view, in pixels. 9615 */ 9616 @ViewDebug.CapturedViewProperty 9617 public final int getBottom() { 9618 return mBottom; 9619 } 9620 9621 /** 9622 * True if this view has changed since the last time being drawn. 9623 * 9624 * @return The dirty state of this view. 9625 */ 9626 public boolean isDirty() { 9627 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 9628 } 9629 9630 /** 9631 * Sets the bottom position of this view relative to its parent. This method is meant to be 9632 * called by the layout system and should not generally be called otherwise, because the 9633 * property may be changed at any time by the layout. 9634 * 9635 * @param bottom The bottom of this view, in pixels. 9636 */ 9637 public final void setBottom(int bottom) { 9638 if (bottom != mBottom) { 9639 updateMatrix(); 9640 final boolean matrixIsIdentity = mTransformationInfo == null 9641 || mTransformationInfo.mMatrixIsIdentity; 9642 if (matrixIsIdentity) { 9643 if (mAttachInfo != null) { 9644 int maxBottom; 9645 if (bottom < mBottom) { 9646 maxBottom = mBottom; 9647 } else { 9648 maxBottom = bottom; 9649 } 9650 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9651 } 9652 } else { 9653 // Double-invalidation is necessary to capture view's old and new areas 9654 invalidate(true); 9655 } 9656 9657 int width = mRight - mLeft; 9658 int oldHeight = mBottom - mTop; 9659 9660 mBottom = bottom; 9661 if (mDisplayList != null) { 9662 mDisplayList.setBottom(mBottom); 9663 } 9664 9665 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9666 9667 if (!matrixIsIdentity) { 9668 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9669 // A change in dimension means an auto-centered pivot point changes, too 9670 mTransformationInfo.mMatrixDirty = true; 9671 } 9672 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9673 invalidate(true); 9674 } 9675 mBackgroundSizeChanged = true; 9676 invalidateParentIfNeeded(); 9677 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9678 // View was rejected last time it was drawn by its parent; this may have changed 9679 invalidateParentIfNeeded(); 9680 } 9681 } 9682 } 9683 9684 /** 9685 * Left position of this view relative to its parent. 9686 * 9687 * @return The left edge of this view, in pixels. 9688 */ 9689 @ViewDebug.CapturedViewProperty 9690 public final int getLeft() { 9691 return mLeft; 9692 } 9693 9694 /** 9695 * Sets the left position of this view relative to its parent. This method is meant to be called 9696 * by the layout system and should not generally be called otherwise, because the property 9697 * may be changed at any time by the layout. 9698 * 9699 * @param left The bottom of this view, in pixels. 9700 */ 9701 public final void setLeft(int left) { 9702 if (left != mLeft) { 9703 updateMatrix(); 9704 final boolean matrixIsIdentity = mTransformationInfo == null 9705 || mTransformationInfo.mMatrixIsIdentity; 9706 if (matrixIsIdentity) { 9707 if (mAttachInfo != null) { 9708 int minLeft; 9709 int xLoc; 9710 if (left < mLeft) { 9711 minLeft = left; 9712 xLoc = left - mLeft; 9713 } else { 9714 minLeft = mLeft; 9715 xLoc = 0; 9716 } 9717 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9718 } 9719 } else { 9720 // Double-invalidation is necessary to capture view's old and new areas 9721 invalidate(true); 9722 } 9723 9724 int oldWidth = mRight - mLeft; 9725 int height = mBottom - mTop; 9726 9727 mLeft = left; 9728 if (mDisplayList != null) { 9729 mDisplayList.setLeft(left); 9730 } 9731 9732 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9733 9734 if (!matrixIsIdentity) { 9735 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9736 // A change in dimension means an auto-centered pivot point changes, too 9737 mTransformationInfo.mMatrixDirty = true; 9738 } 9739 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9740 invalidate(true); 9741 } 9742 mBackgroundSizeChanged = true; 9743 invalidateParentIfNeeded(); 9744 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9745 // View was rejected last time it was drawn by its parent; this may have changed 9746 invalidateParentIfNeeded(); 9747 } 9748 } 9749 } 9750 9751 /** 9752 * Right position of this view relative to its parent. 9753 * 9754 * @return The right edge of this view, in pixels. 9755 */ 9756 @ViewDebug.CapturedViewProperty 9757 public final int getRight() { 9758 return mRight; 9759 } 9760 9761 /** 9762 * Sets the right position of this view relative to its parent. This method is meant to be called 9763 * by the layout system and should not generally be called otherwise, because the property 9764 * may be changed at any time by the layout. 9765 * 9766 * @param right The bottom of this view, in pixels. 9767 */ 9768 public final void setRight(int right) { 9769 if (right != mRight) { 9770 updateMatrix(); 9771 final boolean matrixIsIdentity = mTransformationInfo == null 9772 || mTransformationInfo.mMatrixIsIdentity; 9773 if (matrixIsIdentity) { 9774 if (mAttachInfo != null) { 9775 int maxRight; 9776 if (right < mRight) { 9777 maxRight = mRight; 9778 } else { 9779 maxRight = right; 9780 } 9781 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9782 } 9783 } else { 9784 // Double-invalidation is necessary to capture view's old and new areas 9785 invalidate(true); 9786 } 9787 9788 int oldWidth = mRight - mLeft; 9789 int height = mBottom - mTop; 9790 9791 mRight = right; 9792 if (mDisplayList != null) { 9793 mDisplayList.setRight(mRight); 9794 } 9795 9796 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9797 9798 if (!matrixIsIdentity) { 9799 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9800 // A change in dimension means an auto-centered pivot point changes, too 9801 mTransformationInfo.mMatrixDirty = true; 9802 } 9803 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9804 invalidate(true); 9805 } 9806 mBackgroundSizeChanged = true; 9807 invalidateParentIfNeeded(); 9808 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9809 // View was rejected last time it was drawn by its parent; this may have changed 9810 invalidateParentIfNeeded(); 9811 } 9812 } 9813 } 9814 9815 /** 9816 * The visual x position of this view, in pixels. This is equivalent to the 9817 * {@link #setTranslationX(float) translationX} property plus the current 9818 * {@link #getLeft() left} property. 9819 * 9820 * @return The visual x position of this view, in pixels. 9821 */ 9822 @ViewDebug.ExportedProperty(category = "drawing") 9823 public float getX() { 9824 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9825 } 9826 9827 /** 9828 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9829 * {@link #setTranslationX(float) translationX} property to be the difference between 9830 * the x value passed in and the current {@link #getLeft() left} property. 9831 * 9832 * @param x The visual x position of this view, in pixels. 9833 */ 9834 public void setX(float x) { 9835 setTranslationX(x - mLeft); 9836 } 9837 9838 /** 9839 * The visual y position of this view, in pixels. This is equivalent to the 9840 * {@link #setTranslationY(float) translationY} property plus the current 9841 * {@link #getTop() top} property. 9842 * 9843 * @return The visual y position of this view, in pixels. 9844 */ 9845 @ViewDebug.ExportedProperty(category = "drawing") 9846 public float getY() { 9847 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9848 } 9849 9850 /** 9851 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9852 * {@link #setTranslationY(float) translationY} property to be the difference between 9853 * the y value passed in and the current {@link #getTop() top} property. 9854 * 9855 * @param y The visual y position of this view, in pixels. 9856 */ 9857 public void setY(float y) { 9858 setTranslationY(y - mTop); 9859 } 9860 9861 9862 /** 9863 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9864 * This position is post-layout, in addition to wherever the object's 9865 * layout placed it. 9866 * 9867 * @return The horizontal position of this view relative to its left position, in pixels. 9868 */ 9869 @ViewDebug.ExportedProperty(category = "drawing") 9870 public float getTranslationX() { 9871 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9872 } 9873 9874 /** 9875 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9876 * This effectively positions the object post-layout, in addition to wherever the object's 9877 * layout placed it. 9878 * 9879 * @param translationX The horizontal position of this view relative to its left position, 9880 * in pixels. 9881 * 9882 * @attr ref android.R.styleable#View_translationX 9883 */ 9884 public void setTranslationX(float translationX) { 9885 ensureTransformationInfo(); 9886 final TransformationInfo info = mTransformationInfo; 9887 if (info.mTranslationX != translationX) { 9888 // Double-invalidation is necessary to capture view's old and new areas 9889 invalidateViewProperty(true, false); 9890 info.mTranslationX = translationX; 9891 info.mMatrixDirty = true; 9892 invalidateViewProperty(false, true); 9893 if (mDisplayList != null) { 9894 mDisplayList.setTranslationX(translationX); 9895 } 9896 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9897 // View was rejected last time it was drawn by its parent; this may have changed 9898 invalidateParentIfNeeded(); 9899 } 9900 } 9901 } 9902 9903 /** 9904 * The horizontal location of this view relative to its {@link #getTop() top} position. 9905 * This position is post-layout, in addition to wherever the object's 9906 * layout placed it. 9907 * 9908 * @return The vertical position of this view relative to its top position, 9909 * in pixels. 9910 */ 9911 @ViewDebug.ExportedProperty(category = "drawing") 9912 public float getTranslationY() { 9913 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9914 } 9915 9916 /** 9917 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9918 * This effectively positions the object post-layout, in addition to wherever the object's 9919 * layout placed it. 9920 * 9921 * @param translationY The vertical position of this view relative to its top position, 9922 * in pixels. 9923 * 9924 * @attr ref android.R.styleable#View_translationY 9925 */ 9926 public void setTranslationY(float translationY) { 9927 ensureTransformationInfo(); 9928 final TransformationInfo info = mTransformationInfo; 9929 if (info.mTranslationY != translationY) { 9930 invalidateViewProperty(true, false); 9931 info.mTranslationY = translationY; 9932 info.mMatrixDirty = true; 9933 invalidateViewProperty(false, true); 9934 if (mDisplayList != null) { 9935 mDisplayList.setTranslationY(translationY); 9936 } 9937 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9938 // View was rejected last time it was drawn by its parent; this may have changed 9939 invalidateParentIfNeeded(); 9940 } 9941 } 9942 } 9943 9944 /** 9945 * Hit rectangle in parent's coordinates 9946 * 9947 * @param outRect The hit rectangle of the view. 9948 */ 9949 public void getHitRect(Rect outRect) { 9950 updateMatrix(); 9951 final TransformationInfo info = mTransformationInfo; 9952 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9953 outRect.set(mLeft, mTop, mRight, mBottom); 9954 } else { 9955 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9956 tmpRect.set(0, 0, getWidth(), getHeight()); 9957 info.mMatrix.mapRect(tmpRect); 9958 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9959 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9960 } 9961 } 9962 9963 /** 9964 * Determines whether the given point, in local coordinates is inside the view. 9965 */ 9966 /*package*/ final boolean pointInView(float localX, float localY) { 9967 return localX >= 0 && localX < (mRight - mLeft) 9968 && localY >= 0 && localY < (mBottom - mTop); 9969 } 9970 9971 /** 9972 * Utility method to determine whether the given point, in local coordinates, 9973 * is inside the view, where the area of the view is expanded by the slop factor. 9974 * This method is called while processing touch-move events to determine if the event 9975 * is still within the view. 9976 */ 9977 private boolean pointInView(float localX, float localY, float slop) { 9978 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9979 localY < ((mBottom - mTop) + slop); 9980 } 9981 9982 /** 9983 * When a view has focus and the user navigates away from it, the next view is searched for 9984 * starting from the rectangle filled in by this method. 9985 * 9986 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 9987 * of the view. However, if your view maintains some idea of internal selection, 9988 * such as a cursor, or a selected row or column, you should override this method and 9989 * fill in a more specific rectangle. 9990 * 9991 * @param r The rectangle to fill in, in this view's coordinates. 9992 */ 9993 public void getFocusedRect(Rect r) { 9994 getDrawingRect(r); 9995 } 9996 9997 /** 9998 * If some part of this view is not clipped by any of its parents, then 9999 * return that area in r in global (root) coordinates. To convert r to local 10000 * coordinates (without taking possible View rotations into account), offset 10001 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 10002 * If the view is completely clipped or translated out, return false. 10003 * 10004 * @param r If true is returned, r holds the global coordinates of the 10005 * visible portion of this view. 10006 * @param globalOffset If true is returned, globalOffset holds the dx,dy 10007 * between this view and its root. globalOffet may be null. 10008 * @return true if r is non-empty (i.e. part of the view is visible at the 10009 * root level. 10010 */ 10011 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 10012 int width = mRight - mLeft; 10013 int height = mBottom - mTop; 10014 if (width > 0 && height > 0) { 10015 r.set(0, 0, width, height); 10016 if (globalOffset != null) { 10017 globalOffset.set(-mScrollX, -mScrollY); 10018 } 10019 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 10020 } 10021 return false; 10022 } 10023 10024 public final boolean getGlobalVisibleRect(Rect r) { 10025 return getGlobalVisibleRect(r, null); 10026 } 10027 10028 public final boolean getLocalVisibleRect(Rect r) { 10029 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 10030 if (getGlobalVisibleRect(r, offset)) { 10031 r.offset(-offset.x, -offset.y); // make r local 10032 return true; 10033 } 10034 return false; 10035 } 10036 10037 /** 10038 * Offset this view's vertical location by the specified number of pixels. 10039 * 10040 * @param offset the number of pixels to offset the view by 10041 */ 10042 public void offsetTopAndBottom(int offset) { 10043 if (offset != 0) { 10044 updateMatrix(); 10045 final boolean matrixIsIdentity = mTransformationInfo == null 10046 || mTransformationInfo.mMatrixIsIdentity; 10047 if (matrixIsIdentity) { 10048 if (mDisplayList != null) { 10049 invalidateViewProperty(false, false); 10050 } else { 10051 final ViewParent p = mParent; 10052 if (p != null && mAttachInfo != null) { 10053 final Rect r = mAttachInfo.mTmpInvalRect; 10054 int minTop; 10055 int maxBottom; 10056 int yLoc; 10057 if (offset < 0) { 10058 minTop = mTop + offset; 10059 maxBottom = mBottom; 10060 yLoc = offset; 10061 } else { 10062 minTop = mTop; 10063 maxBottom = mBottom + offset; 10064 yLoc = 0; 10065 } 10066 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 10067 p.invalidateChild(this, r); 10068 } 10069 } 10070 } else { 10071 invalidateViewProperty(false, false); 10072 } 10073 10074 mTop += offset; 10075 mBottom += offset; 10076 if (mDisplayList != null) { 10077 mDisplayList.offsetTopAndBottom(offset); 10078 invalidateViewProperty(false, false); 10079 } else { 10080 if (!matrixIsIdentity) { 10081 invalidateViewProperty(false, true); 10082 } 10083 invalidateParentIfNeeded(); 10084 } 10085 } 10086 } 10087 10088 /** 10089 * Offset this view's horizontal location by the specified amount of pixels. 10090 * 10091 * @param offset the numer of pixels to offset the view by 10092 */ 10093 public void offsetLeftAndRight(int offset) { 10094 if (offset != 0) { 10095 updateMatrix(); 10096 final boolean matrixIsIdentity = mTransformationInfo == null 10097 || mTransformationInfo.mMatrixIsIdentity; 10098 if (matrixIsIdentity) { 10099 if (mDisplayList != null) { 10100 invalidateViewProperty(false, false); 10101 } else { 10102 final ViewParent p = mParent; 10103 if (p != null && mAttachInfo != null) { 10104 final Rect r = mAttachInfo.mTmpInvalRect; 10105 int minLeft; 10106 int maxRight; 10107 if (offset < 0) { 10108 minLeft = mLeft + offset; 10109 maxRight = mRight; 10110 } else { 10111 minLeft = mLeft; 10112 maxRight = mRight + offset; 10113 } 10114 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 10115 p.invalidateChild(this, r); 10116 } 10117 } 10118 } else { 10119 invalidateViewProperty(false, false); 10120 } 10121 10122 mLeft += offset; 10123 mRight += offset; 10124 if (mDisplayList != null) { 10125 mDisplayList.offsetLeftAndRight(offset); 10126 invalidateViewProperty(false, false); 10127 } else { 10128 if (!matrixIsIdentity) { 10129 invalidateViewProperty(false, true); 10130 } 10131 invalidateParentIfNeeded(); 10132 } 10133 } 10134 } 10135 10136 /** 10137 * Get the LayoutParams associated with this view. All views should have 10138 * layout parameters. These supply parameters to the <i>parent</i> of this 10139 * view specifying how it should be arranged. There are many subclasses of 10140 * ViewGroup.LayoutParams, and these correspond to the different subclasses 10141 * of ViewGroup that are responsible for arranging their children. 10142 * 10143 * This method may return null if this View is not attached to a parent 10144 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 10145 * was not invoked successfully. When a View is attached to a parent 10146 * ViewGroup, this method must not return null. 10147 * 10148 * @return The LayoutParams associated with this view, or null if no 10149 * parameters have been set yet 10150 */ 10151 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 10152 public ViewGroup.LayoutParams getLayoutParams() { 10153 return mLayoutParams; 10154 } 10155 10156 /** 10157 * Set the layout parameters associated with this view. These supply 10158 * parameters to the <i>parent</i> of this view specifying how it should be 10159 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 10160 * correspond to the different subclasses of ViewGroup that are responsible 10161 * for arranging their children. 10162 * 10163 * @param params The layout parameters for this view, cannot be null 10164 */ 10165 public void setLayoutParams(ViewGroup.LayoutParams params) { 10166 if (params == null) { 10167 throw new NullPointerException("Layout parameters cannot be null"); 10168 } 10169 mLayoutParams = params; 10170 resolveLayoutParams(); 10171 if (mParent instanceof ViewGroup) { 10172 ((ViewGroup) mParent).onSetLayoutParams(this, params); 10173 } 10174 requestLayout(); 10175 } 10176 10177 /** 10178 * Resolve the layout parameters depending on the resolved layout direction 10179 * 10180 * @hide 10181 */ 10182 public void resolveLayoutParams() { 10183 if (mLayoutParams != null) { 10184 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10185 } 10186 } 10187 10188 /** 10189 * Set the scrolled position of your view. This will cause a call to 10190 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10191 * invalidated. 10192 * @param x the x position to scroll to 10193 * @param y the y position to scroll to 10194 */ 10195 public void scrollTo(int x, int y) { 10196 if (mScrollX != x || mScrollY != y) { 10197 int oldX = mScrollX; 10198 int oldY = mScrollY; 10199 mScrollX = x; 10200 mScrollY = y; 10201 invalidateParentCaches(); 10202 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10203 if (!awakenScrollBars()) { 10204 postInvalidateOnAnimation(); 10205 } 10206 } 10207 } 10208 10209 /** 10210 * Move the scrolled position of your view. This will cause a call to 10211 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10212 * invalidated. 10213 * @param x the amount of pixels to scroll by horizontally 10214 * @param y the amount of pixels to scroll by vertically 10215 */ 10216 public void scrollBy(int x, int y) { 10217 scrollTo(mScrollX + x, mScrollY + y); 10218 } 10219 10220 /** 10221 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10222 * animation to fade the scrollbars out after a default delay. If a subclass 10223 * provides animated scrolling, the start delay should equal the duration 10224 * of the scrolling animation.</p> 10225 * 10226 * <p>The animation starts only if at least one of the scrollbars is 10227 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10228 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10229 * this method returns true, and false otherwise. If the animation is 10230 * started, this method calls {@link #invalidate()}; in that case the 10231 * caller should not call {@link #invalidate()}.</p> 10232 * 10233 * <p>This method should be invoked every time a subclass directly updates 10234 * the scroll parameters.</p> 10235 * 10236 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10237 * and {@link #scrollTo(int, int)}.</p> 10238 * 10239 * @return true if the animation is played, false otherwise 10240 * 10241 * @see #awakenScrollBars(int) 10242 * @see #scrollBy(int, int) 10243 * @see #scrollTo(int, int) 10244 * @see #isHorizontalScrollBarEnabled() 10245 * @see #isVerticalScrollBarEnabled() 10246 * @see #setHorizontalScrollBarEnabled(boolean) 10247 * @see #setVerticalScrollBarEnabled(boolean) 10248 */ 10249 protected boolean awakenScrollBars() { 10250 return mScrollCache != null && 10251 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10252 } 10253 10254 /** 10255 * Trigger the scrollbars to draw. 10256 * This method differs from awakenScrollBars() only in its default duration. 10257 * initialAwakenScrollBars() will show the scroll bars for longer than 10258 * usual to give the user more of a chance to notice them. 10259 * 10260 * @return true if the animation is played, false otherwise. 10261 */ 10262 private boolean initialAwakenScrollBars() { 10263 return mScrollCache != null && 10264 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10265 } 10266 10267 /** 10268 * <p> 10269 * Trigger the scrollbars to draw. When invoked this method starts an 10270 * animation to fade the scrollbars out after a fixed delay. If a subclass 10271 * provides animated scrolling, the start delay should equal the duration of 10272 * the scrolling animation. 10273 * </p> 10274 * 10275 * <p> 10276 * The animation starts only if at least one of the scrollbars is enabled, 10277 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10278 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10279 * this method returns true, and false otherwise. If the animation is 10280 * started, this method calls {@link #invalidate()}; in that case the caller 10281 * should not call {@link #invalidate()}. 10282 * </p> 10283 * 10284 * <p> 10285 * This method should be invoked everytime a subclass directly updates the 10286 * scroll parameters. 10287 * </p> 10288 * 10289 * @param startDelay the delay, in milliseconds, after which the animation 10290 * should start; when the delay is 0, the animation starts 10291 * immediately 10292 * @return true if the animation is played, false otherwise 10293 * 10294 * @see #scrollBy(int, int) 10295 * @see #scrollTo(int, int) 10296 * @see #isHorizontalScrollBarEnabled() 10297 * @see #isVerticalScrollBarEnabled() 10298 * @see #setHorizontalScrollBarEnabled(boolean) 10299 * @see #setVerticalScrollBarEnabled(boolean) 10300 */ 10301 protected boolean awakenScrollBars(int startDelay) { 10302 return awakenScrollBars(startDelay, true); 10303 } 10304 10305 /** 10306 * <p> 10307 * Trigger the scrollbars to draw. When invoked this method starts an 10308 * animation to fade the scrollbars out after a fixed delay. If a subclass 10309 * provides animated scrolling, the start delay should equal the duration of 10310 * the scrolling animation. 10311 * </p> 10312 * 10313 * <p> 10314 * The animation starts only if at least one of the scrollbars is enabled, 10315 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10316 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10317 * this method returns true, and false otherwise. If the animation is 10318 * started, this method calls {@link #invalidate()} if the invalidate parameter 10319 * is set to true; in that case the caller 10320 * should not call {@link #invalidate()}. 10321 * </p> 10322 * 10323 * <p> 10324 * This method should be invoked everytime a subclass directly updates the 10325 * scroll parameters. 10326 * </p> 10327 * 10328 * @param startDelay the delay, in milliseconds, after which the animation 10329 * should start; when the delay is 0, the animation starts 10330 * immediately 10331 * 10332 * @param invalidate Wheter this method should call invalidate 10333 * 10334 * @return true if the animation is played, false otherwise 10335 * 10336 * @see #scrollBy(int, int) 10337 * @see #scrollTo(int, int) 10338 * @see #isHorizontalScrollBarEnabled() 10339 * @see #isVerticalScrollBarEnabled() 10340 * @see #setHorizontalScrollBarEnabled(boolean) 10341 * @see #setVerticalScrollBarEnabled(boolean) 10342 */ 10343 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10344 final ScrollabilityCache scrollCache = mScrollCache; 10345 10346 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10347 return false; 10348 } 10349 10350 if (scrollCache.scrollBar == null) { 10351 scrollCache.scrollBar = new ScrollBarDrawable(); 10352 } 10353 10354 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10355 10356 if (invalidate) { 10357 // Invalidate to show the scrollbars 10358 postInvalidateOnAnimation(); 10359 } 10360 10361 if (scrollCache.state == ScrollabilityCache.OFF) { 10362 // FIXME: this is copied from WindowManagerService. 10363 // We should get this value from the system when it 10364 // is possible to do so. 10365 final int KEY_REPEAT_FIRST_DELAY = 750; 10366 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10367 } 10368 10369 // Tell mScrollCache when we should start fading. This may 10370 // extend the fade start time if one was already scheduled 10371 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10372 scrollCache.fadeStartTime = fadeStartTime; 10373 scrollCache.state = ScrollabilityCache.ON; 10374 10375 // Schedule our fader to run, unscheduling any old ones first 10376 if (mAttachInfo != null) { 10377 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10378 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10379 } 10380 10381 return true; 10382 } 10383 10384 return false; 10385 } 10386 10387 /** 10388 * Do not invalidate views which are not visible and which are not running an animation. They 10389 * will not get drawn and they should not set dirty flags as if they will be drawn 10390 */ 10391 private boolean skipInvalidate() { 10392 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10393 (!(mParent instanceof ViewGroup) || 10394 !((ViewGroup) mParent).isViewTransitioning(this)); 10395 } 10396 /** 10397 * Mark the area defined by dirty as needing to be drawn. If the view is 10398 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10399 * in the future. This must be called from a UI thread. To call from a non-UI 10400 * thread, call {@link #postInvalidate()}. 10401 * 10402 * WARNING: This method is destructive to dirty. 10403 * @param dirty the rectangle representing the bounds of the dirty region 10404 */ 10405 public void invalidate(Rect dirty) { 10406 if (skipInvalidate()) { 10407 return; 10408 } 10409 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10410 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10411 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10412 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10413 mPrivateFlags |= PFLAG_INVALIDATED; 10414 mPrivateFlags |= PFLAG_DIRTY; 10415 final ViewParent p = mParent; 10416 final AttachInfo ai = mAttachInfo; 10417 //noinspection PointlessBooleanExpression,ConstantConditions 10418 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10419 if (p != null && ai != null && ai.mHardwareAccelerated) { 10420 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10421 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10422 p.invalidateChild(this, null); 10423 return; 10424 } 10425 } 10426 if (p != null && ai != null) { 10427 final int scrollX = mScrollX; 10428 final int scrollY = mScrollY; 10429 final Rect r = ai.mTmpInvalRect; 10430 r.set(dirty.left - scrollX, dirty.top - scrollY, 10431 dirty.right - scrollX, dirty.bottom - scrollY); 10432 mParent.invalidateChild(this, r); 10433 } 10434 } 10435 } 10436 10437 /** 10438 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10439 * The coordinates of the dirty rect are relative to the view. 10440 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10441 * will be called at some point in the future. This must be called from 10442 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10443 * @param l the left position of the dirty region 10444 * @param t the top position of the dirty region 10445 * @param r the right position of the dirty region 10446 * @param b the bottom position of the dirty region 10447 */ 10448 public void invalidate(int l, int t, int r, int b) { 10449 if (skipInvalidate()) { 10450 return; 10451 } 10452 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10453 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10454 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10455 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10456 mPrivateFlags |= PFLAG_INVALIDATED; 10457 mPrivateFlags |= PFLAG_DIRTY; 10458 final ViewParent p = mParent; 10459 final AttachInfo ai = mAttachInfo; 10460 //noinspection PointlessBooleanExpression,ConstantConditions 10461 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10462 if (p != null && ai != null && ai.mHardwareAccelerated) { 10463 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10464 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10465 p.invalidateChild(this, null); 10466 return; 10467 } 10468 } 10469 if (p != null && ai != null && l < r && t < b) { 10470 final int scrollX = mScrollX; 10471 final int scrollY = mScrollY; 10472 final Rect tmpr = ai.mTmpInvalRect; 10473 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10474 p.invalidateChild(this, tmpr); 10475 } 10476 } 10477 } 10478 10479 /** 10480 * Invalidate the whole view. If the view is visible, 10481 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10482 * the future. This must be called from a UI thread. To call from a non-UI thread, 10483 * call {@link #postInvalidate()}. 10484 */ 10485 public void invalidate() { 10486 invalidate(true); 10487 } 10488 10489 /** 10490 * This is where the invalidate() work actually happens. A full invalidate() 10491 * causes the drawing cache to be invalidated, but this function can be called with 10492 * invalidateCache set to false to skip that invalidation step for cases that do not 10493 * need it (for example, a component that remains at the same dimensions with the same 10494 * content). 10495 * 10496 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10497 * well. This is usually true for a full invalidate, but may be set to false if the 10498 * View's contents or dimensions have not changed. 10499 */ 10500 void invalidate(boolean invalidateCache) { 10501 if (skipInvalidate()) { 10502 return; 10503 } 10504 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10505 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10506 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10507 mLastIsOpaque = isOpaque(); 10508 mPrivateFlags &= ~PFLAG_DRAWN; 10509 mPrivateFlags |= PFLAG_DIRTY; 10510 if (invalidateCache) { 10511 mPrivateFlags |= PFLAG_INVALIDATED; 10512 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10513 } 10514 final AttachInfo ai = mAttachInfo; 10515 final ViewParent p = mParent; 10516 //noinspection PointlessBooleanExpression,ConstantConditions 10517 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10518 if (p != null && ai != null && ai.mHardwareAccelerated) { 10519 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10520 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10521 p.invalidateChild(this, null); 10522 return; 10523 } 10524 } 10525 10526 if (p != null && ai != null) { 10527 final Rect r = ai.mTmpInvalRect; 10528 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10529 // Don't call invalidate -- we don't want to internally scroll 10530 // our own bounds 10531 p.invalidateChild(this, r); 10532 } 10533 } 10534 } 10535 10536 /** 10537 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10538 * set any flags or handle all of the cases handled by the default invalidation methods. 10539 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10540 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10541 * walk up the hierarchy, transforming the dirty rect as necessary. 10542 * 10543 * The method also handles normal invalidation logic if display list properties are not 10544 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10545 * backup approach, to handle these cases used in the various property-setting methods. 10546 * 10547 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10548 * are not being used in this view 10549 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10550 * list properties are not being used in this view 10551 */ 10552 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10553 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10554 if (invalidateParent) { 10555 invalidateParentCaches(); 10556 } 10557 if (forceRedraw) { 10558 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10559 } 10560 invalidate(false); 10561 } else { 10562 final AttachInfo ai = mAttachInfo; 10563 final ViewParent p = mParent; 10564 if (p != null && ai != null) { 10565 final Rect r = ai.mTmpInvalRect; 10566 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10567 if (mParent instanceof ViewGroup) { 10568 ((ViewGroup) mParent).invalidateChildFast(this, r); 10569 } else { 10570 mParent.invalidateChild(this, r); 10571 } 10572 } 10573 } 10574 } 10575 10576 /** 10577 * Utility method to transform a given Rect by the current matrix of this view. 10578 */ 10579 void transformRect(final Rect rect) { 10580 if (!getMatrix().isIdentity()) { 10581 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10582 boundingRect.set(rect); 10583 getMatrix().mapRect(boundingRect); 10584 rect.set((int) (boundingRect.left - 0.5f), 10585 (int) (boundingRect.top - 0.5f), 10586 (int) (boundingRect.right + 0.5f), 10587 (int) (boundingRect.bottom + 0.5f)); 10588 } 10589 } 10590 10591 /** 10592 * Used to indicate that the parent of this view should clear its caches. This functionality 10593 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10594 * which is necessary when various parent-managed properties of the view change, such as 10595 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10596 * clears the parent caches and does not causes an invalidate event. 10597 * 10598 * @hide 10599 */ 10600 protected void invalidateParentCaches() { 10601 if (mParent instanceof View) { 10602 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10603 } 10604 } 10605 10606 /** 10607 * Used to indicate that the parent of this view should be invalidated. This functionality 10608 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10609 * which is necessary when various parent-managed properties of the view change, such as 10610 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10611 * an invalidation event to the parent. 10612 * 10613 * @hide 10614 */ 10615 protected void invalidateParentIfNeeded() { 10616 if (isHardwareAccelerated() && mParent instanceof View) { 10617 ((View) mParent).invalidate(true); 10618 } 10619 } 10620 10621 /** 10622 * Indicates whether this View is opaque. An opaque View guarantees that it will 10623 * draw all the pixels overlapping its bounds using a fully opaque color. 10624 * 10625 * Subclasses of View should override this method whenever possible to indicate 10626 * whether an instance is opaque. Opaque Views are treated in a special way by 10627 * the View hierarchy, possibly allowing it to perform optimizations during 10628 * invalidate/draw passes. 10629 * 10630 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10631 */ 10632 @ViewDebug.ExportedProperty(category = "drawing") 10633 public boolean isOpaque() { 10634 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 10635 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10636 } 10637 10638 /** 10639 * @hide 10640 */ 10641 protected void computeOpaqueFlags() { 10642 // Opaque if: 10643 // - Has a background 10644 // - Background is opaque 10645 // - Doesn't have scrollbars or scrollbars are inside overlay 10646 10647 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10648 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 10649 } else { 10650 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 10651 } 10652 10653 final int flags = mViewFlags; 10654 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10655 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10656 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 10657 } else { 10658 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 10659 } 10660 } 10661 10662 /** 10663 * @hide 10664 */ 10665 protected boolean hasOpaqueScrollbars() { 10666 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 10667 } 10668 10669 /** 10670 * @return A handler associated with the thread running the View. This 10671 * handler can be used to pump events in the UI events queue. 10672 */ 10673 public Handler getHandler() { 10674 if (mAttachInfo != null) { 10675 return mAttachInfo.mHandler; 10676 } 10677 return null; 10678 } 10679 10680 /** 10681 * Gets the view root associated with the View. 10682 * @return The view root, or null if none. 10683 * @hide 10684 */ 10685 public ViewRootImpl getViewRootImpl() { 10686 if (mAttachInfo != null) { 10687 return mAttachInfo.mViewRootImpl; 10688 } 10689 return null; 10690 } 10691 10692 /** 10693 * <p>Causes the Runnable to be added to the message queue. 10694 * The runnable will be run on the user interface thread.</p> 10695 * 10696 * @param action The Runnable that will be executed. 10697 * 10698 * @return Returns true if the Runnable was successfully placed in to the 10699 * message queue. Returns false on failure, usually because the 10700 * looper processing the message queue is exiting. 10701 * 10702 * @see #postDelayed 10703 * @see #removeCallbacks 10704 */ 10705 public boolean post(Runnable action) { 10706 final AttachInfo attachInfo = mAttachInfo; 10707 if (attachInfo != null) { 10708 return attachInfo.mHandler.post(action); 10709 } 10710 // Assume that post will succeed later 10711 ViewRootImpl.getRunQueue().post(action); 10712 return true; 10713 } 10714 10715 /** 10716 * <p>Causes the Runnable to be added to the message queue, to be run 10717 * after the specified amount of time elapses. 10718 * The runnable will be run on the user interface thread.</p> 10719 * 10720 * @param action The Runnable that will be executed. 10721 * @param delayMillis The delay (in milliseconds) until the Runnable 10722 * will be executed. 10723 * 10724 * @return true if the Runnable was successfully placed in to the 10725 * message queue. Returns false on failure, usually because the 10726 * looper processing the message queue is exiting. Note that a 10727 * result of true does not mean the Runnable will be processed -- 10728 * if the looper is quit before the delivery time of the message 10729 * occurs then the message will be dropped. 10730 * 10731 * @see #post 10732 * @see #removeCallbacks 10733 */ 10734 public boolean postDelayed(Runnable action, long delayMillis) { 10735 final AttachInfo attachInfo = mAttachInfo; 10736 if (attachInfo != null) { 10737 return attachInfo.mHandler.postDelayed(action, delayMillis); 10738 } 10739 // Assume that post will succeed later 10740 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10741 return true; 10742 } 10743 10744 /** 10745 * <p>Causes the Runnable to execute on the next animation time step. 10746 * The runnable will be run on the user interface thread.</p> 10747 * 10748 * @param action The Runnable that will be executed. 10749 * 10750 * @see #postOnAnimationDelayed 10751 * @see #removeCallbacks 10752 */ 10753 public void postOnAnimation(Runnable action) { 10754 final AttachInfo attachInfo = mAttachInfo; 10755 if (attachInfo != null) { 10756 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10757 Choreographer.CALLBACK_ANIMATION, action, null); 10758 } else { 10759 // Assume that post will succeed later 10760 ViewRootImpl.getRunQueue().post(action); 10761 } 10762 } 10763 10764 /** 10765 * <p>Causes the Runnable to execute on the next animation time step, 10766 * after the specified amount of time elapses. 10767 * The runnable will be run on the user interface thread.</p> 10768 * 10769 * @param action The Runnable that will be executed. 10770 * @param delayMillis The delay (in milliseconds) until the Runnable 10771 * will be executed. 10772 * 10773 * @see #postOnAnimation 10774 * @see #removeCallbacks 10775 */ 10776 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10777 final AttachInfo attachInfo = mAttachInfo; 10778 if (attachInfo != null) { 10779 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10780 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10781 } else { 10782 // Assume that post will succeed later 10783 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10784 } 10785 } 10786 10787 /** 10788 * <p>Removes the specified Runnable from the message queue.</p> 10789 * 10790 * @param action The Runnable to remove from the message handling queue 10791 * 10792 * @return true if this view could ask the Handler to remove the Runnable, 10793 * false otherwise. When the returned value is true, the Runnable 10794 * may or may not have been actually removed from the message queue 10795 * (for instance, if the Runnable was not in the queue already.) 10796 * 10797 * @see #post 10798 * @see #postDelayed 10799 * @see #postOnAnimation 10800 * @see #postOnAnimationDelayed 10801 */ 10802 public boolean removeCallbacks(Runnable action) { 10803 if (action != null) { 10804 final AttachInfo attachInfo = mAttachInfo; 10805 if (attachInfo != null) { 10806 attachInfo.mHandler.removeCallbacks(action); 10807 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10808 Choreographer.CALLBACK_ANIMATION, action, null); 10809 } else { 10810 // Assume that post will succeed later 10811 ViewRootImpl.getRunQueue().removeCallbacks(action); 10812 } 10813 } 10814 return true; 10815 } 10816 10817 /** 10818 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10819 * Use this to invalidate the View from a non-UI thread.</p> 10820 * 10821 * <p>This method can be invoked from outside of the UI thread 10822 * only when this View is attached to a window.</p> 10823 * 10824 * @see #invalidate() 10825 * @see #postInvalidateDelayed(long) 10826 */ 10827 public void postInvalidate() { 10828 postInvalidateDelayed(0); 10829 } 10830 10831 /** 10832 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10833 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10834 * 10835 * <p>This method can be invoked from outside of the UI thread 10836 * only when this View is attached to a window.</p> 10837 * 10838 * @param left The left coordinate of the rectangle to invalidate. 10839 * @param top The top coordinate of the rectangle to invalidate. 10840 * @param right The right coordinate of the rectangle to invalidate. 10841 * @param bottom The bottom coordinate of the rectangle to invalidate. 10842 * 10843 * @see #invalidate(int, int, int, int) 10844 * @see #invalidate(Rect) 10845 * @see #postInvalidateDelayed(long, int, int, int, int) 10846 */ 10847 public void postInvalidate(int left, int top, int right, int bottom) { 10848 postInvalidateDelayed(0, left, top, right, bottom); 10849 } 10850 10851 /** 10852 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10853 * loop. Waits for the specified amount of time.</p> 10854 * 10855 * <p>This method can be invoked from outside of the UI thread 10856 * only when this View is attached to a window.</p> 10857 * 10858 * @param delayMilliseconds the duration in milliseconds to delay the 10859 * invalidation by 10860 * 10861 * @see #invalidate() 10862 * @see #postInvalidate() 10863 */ 10864 public void postInvalidateDelayed(long delayMilliseconds) { 10865 // We try only with the AttachInfo because there's no point in invalidating 10866 // if we are not attached to our window 10867 final AttachInfo attachInfo = mAttachInfo; 10868 if (attachInfo != null) { 10869 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10870 } 10871 } 10872 10873 /** 10874 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10875 * through the event loop. Waits for the specified amount of time.</p> 10876 * 10877 * <p>This method can be invoked from outside of the UI thread 10878 * only when this View is attached to a window.</p> 10879 * 10880 * @param delayMilliseconds the duration in milliseconds to delay the 10881 * invalidation by 10882 * @param left The left coordinate of the rectangle to invalidate. 10883 * @param top The top coordinate of the rectangle to invalidate. 10884 * @param right The right coordinate of the rectangle to invalidate. 10885 * @param bottom The bottom coordinate of the rectangle to invalidate. 10886 * 10887 * @see #invalidate(int, int, int, int) 10888 * @see #invalidate(Rect) 10889 * @see #postInvalidate(int, int, int, int) 10890 */ 10891 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10892 int right, int bottom) { 10893 10894 // We try only with the AttachInfo because there's no point in invalidating 10895 // if we are not attached to our window 10896 final AttachInfo attachInfo = mAttachInfo; 10897 if (attachInfo != null) { 10898 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 10899 info.target = this; 10900 info.left = left; 10901 info.top = top; 10902 info.right = right; 10903 info.bottom = bottom; 10904 10905 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10906 } 10907 } 10908 10909 /** 10910 * <p>Cause an invalidate to happen on the next animation time step, typically the 10911 * next display frame.</p> 10912 * 10913 * <p>This method can be invoked from outside of the UI thread 10914 * only when this View is attached to a window.</p> 10915 * 10916 * @see #invalidate() 10917 */ 10918 public void postInvalidateOnAnimation() { 10919 // We try only with the AttachInfo because there's no point in invalidating 10920 // if we are not attached to our window 10921 final AttachInfo attachInfo = mAttachInfo; 10922 if (attachInfo != null) { 10923 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10924 } 10925 } 10926 10927 /** 10928 * <p>Cause an invalidate of the specified area to happen on the next animation 10929 * time step, typically the next display frame.</p> 10930 * 10931 * <p>This method can be invoked from outside of the UI thread 10932 * only when this View is attached to a window.</p> 10933 * 10934 * @param left The left coordinate of the rectangle to invalidate. 10935 * @param top The top coordinate of the rectangle to invalidate. 10936 * @param right The right coordinate of the rectangle to invalidate. 10937 * @param bottom The bottom coordinate of the rectangle to invalidate. 10938 * 10939 * @see #invalidate(int, int, int, int) 10940 * @see #invalidate(Rect) 10941 */ 10942 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10943 // We try only with the AttachInfo because there's no point in invalidating 10944 // if we are not attached to our window 10945 final AttachInfo attachInfo = mAttachInfo; 10946 if (attachInfo != null) { 10947 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 10948 info.target = this; 10949 info.left = left; 10950 info.top = top; 10951 info.right = right; 10952 info.bottom = bottom; 10953 10954 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10955 } 10956 } 10957 10958 /** 10959 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10960 * This event is sent at most once every 10961 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10962 */ 10963 private void postSendViewScrolledAccessibilityEventCallback() { 10964 if (mSendViewScrolledAccessibilityEvent == null) { 10965 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10966 } 10967 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10968 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10969 postDelayed(mSendViewScrolledAccessibilityEvent, 10970 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10971 } 10972 } 10973 10974 /** 10975 * Called by a parent to request that a child update its values for mScrollX 10976 * and mScrollY if necessary. This will typically be done if the child is 10977 * animating a scroll using a {@link android.widget.Scroller Scroller} 10978 * object. 10979 */ 10980 public void computeScroll() { 10981 } 10982 10983 /** 10984 * <p>Indicate whether the horizontal edges are faded when the view is 10985 * scrolled horizontally.</p> 10986 * 10987 * @return true if the horizontal edges should are faded on scroll, false 10988 * otherwise 10989 * 10990 * @see #setHorizontalFadingEdgeEnabled(boolean) 10991 * 10992 * @attr ref android.R.styleable#View_requiresFadingEdge 10993 */ 10994 public boolean isHorizontalFadingEdgeEnabled() { 10995 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10996 } 10997 10998 /** 10999 * <p>Define whether the horizontal edges should be faded when this view 11000 * is scrolled horizontally.</p> 11001 * 11002 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 11003 * be faded when the view is scrolled 11004 * horizontally 11005 * 11006 * @see #isHorizontalFadingEdgeEnabled() 11007 * 11008 * @attr ref android.R.styleable#View_requiresFadingEdge 11009 */ 11010 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 11011 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 11012 if (horizontalFadingEdgeEnabled) { 11013 initScrollCache(); 11014 } 11015 11016 mViewFlags ^= FADING_EDGE_HORIZONTAL; 11017 } 11018 } 11019 11020 /** 11021 * <p>Indicate whether the vertical edges are faded when the view is 11022 * scrolled horizontally.</p> 11023 * 11024 * @return true if the vertical edges should are faded on scroll, false 11025 * otherwise 11026 * 11027 * @see #setVerticalFadingEdgeEnabled(boolean) 11028 * 11029 * @attr ref android.R.styleable#View_requiresFadingEdge 11030 */ 11031 public boolean isVerticalFadingEdgeEnabled() { 11032 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 11033 } 11034 11035 /** 11036 * <p>Define whether the vertical edges should be faded when this view 11037 * is scrolled vertically.</p> 11038 * 11039 * @param verticalFadingEdgeEnabled true if the vertical edges should 11040 * be faded when the view is scrolled 11041 * vertically 11042 * 11043 * @see #isVerticalFadingEdgeEnabled() 11044 * 11045 * @attr ref android.R.styleable#View_requiresFadingEdge 11046 */ 11047 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 11048 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 11049 if (verticalFadingEdgeEnabled) { 11050 initScrollCache(); 11051 } 11052 11053 mViewFlags ^= FADING_EDGE_VERTICAL; 11054 } 11055 } 11056 11057 /** 11058 * Returns the strength, or intensity, of the top faded edge. The strength is 11059 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11060 * returns 0.0 or 1.0 but no value in between. 11061 * 11062 * Subclasses should override this method to provide a smoother fade transition 11063 * when scrolling occurs. 11064 * 11065 * @return the intensity of the top fade as a float between 0.0f and 1.0f 11066 */ 11067 protected float getTopFadingEdgeStrength() { 11068 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 11069 } 11070 11071 /** 11072 * Returns the strength, or intensity, of the bottom faded edge. The strength is 11073 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11074 * returns 0.0 or 1.0 but no value in between. 11075 * 11076 * Subclasses should override this method to provide a smoother fade transition 11077 * when scrolling occurs. 11078 * 11079 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 11080 */ 11081 protected float getBottomFadingEdgeStrength() { 11082 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 11083 computeVerticalScrollRange() ? 1.0f : 0.0f; 11084 } 11085 11086 /** 11087 * Returns the strength, or intensity, of the left faded edge. The strength is 11088 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11089 * returns 0.0 or 1.0 but no value in between. 11090 * 11091 * Subclasses should override this method to provide a smoother fade transition 11092 * when scrolling occurs. 11093 * 11094 * @return the intensity of the left fade as a float between 0.0f and 1.0f 11095 */ 11096 protected float getLeftFadingEdgeStrength() { 11097 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 11098 } 11099 11100 /** 11101 * Returns the strength, or intensity, of the right faded edge. The strength is 11102 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11103 * returns 0.0 or 1.0 but no value in between. 11104 * 11105 * Subclasses should override this method to provide a smoother fade transition 11106 * when scrolling occurs. 11107 * 11108 * @return the intensity of the right fade as a float between 0.0f and 1.0f 11109 */ 11110 protected float getRightFadingEdgeStrength() { 11111 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 11112 computeHorizontalScrollRange() ? 1.0f : 0.0f; 11113 } 11114 11115 /** 11116 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 11117 * scrollbar is not drawn by default.</p> 11118 * 11119 * @return true if the horizontal scrollbar should be painted, false 11120 * otherwise 11121 * 11122 * @see #setHorizontalScrollBarEnabled(boolean) 11123 */ 11124 public boolean isHorizontalScrollBarEnabled() { 11125 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11126 } 11127 11128 /** 11129 * <p>Define whether the horizontal scrollbar should be drawn or not. The 11130 * scrollbar is not drawn by default.</p> 11131 * 11132 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 11133 * be painted 11134 * 11135 * @see #isHorizontalScrollBarEnabled() 11136 */ 11137 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 11138 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 11139 mViewFlags ^= SCROLLBARS_HORIZONTAL; 11140 computeOpaqueFlags(); 11141 resolvePadding(); 11142 } 11143 } 11144 11145 /** 11146 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 11147 * scrollbar is not drawn by default.</p> 11148 * 11149 * @return true if the vertical scrollbar should be painted, false 11150 * otherwise 11151 * 11152 * @see #setVerticalScrollBarEnabled(boolean) 11153 */ 11154 public boolean isVerticalScrollBarEnabled() { 11155 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 11156 } 11157 11158 /** 11159 * <p>Define whether the vertical scrollbar should be drawn or not. The 11160 * scrollbar is not drawn by default.</p> 11161 * 11162 * @param verticalScrollBarEnabled true if the vertical scrollbar should 11163 * be painted 11164 * 11165 * @see #isVerticalScrollBarEnabled() 11166 */ 11167 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 11168 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 11169 mViewFlags ^= SCROLLBARS_VERTICAL; 11170 computeOpaqueFlags(); 11171 resolvePadding(); 11172 } 11173 } 11174 11175 /** 11176 * @hide 11177 */ 11178 protected void recomputePadding() { 11179 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11180 } 11181 11182 /** 11183 * Define whether scrollbars will fade when the view is not scrolling. 11184 * 11185 * @param fadeScrollbars wheter to enable fading 11186 * 11187 * @attr ref android.R.styleable#View_fadeScrollbars 11188 */ 11189 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11190 initScrollCache(); 11191 final ScrollabilityCache scrollabilityCache = mScrollCache; 11192 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11193 if (fadeScrollbars) { 11194 scrollabilityCache.state = ScrollabilityCache.OFF; 11195 } else { 11196 scrollabilityCache.state = ScrollabilityCache.ON; 11197 } 11198 } 11199 11200 /** 11201 * 11202 * Returns true if scrollbars will fade when this view is not scrolling 11203 * 11204 * @return true if scrollbar fading is enabled 11205 * 11206 * @attr ref android.R.styleable#View_fadeScrollbars 11207 */ 11208 public boolean isScrollbarFadingEnabled() { 11209 return mScrollCache != null && mScrollCache.fadeScrollBars; 11210 } 11211 11212 /** 11213 * 11214 * Returns the delay before scrollbars fade. 11215 * 11216 * @return the delay before scrollbars fade 11217 * 11218 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11219 */ 11220 public int getScrollBarDefaultDelayBeforeFade() { 11221 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11222 mScrollCache.scrollBarDefaultDelayBeforeFade; 11223 } 11224 11225 /** 11226 * Define the delay before scrollbars fade. 11227 * 11228 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11229 * 11230 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11231 */ 11232 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11233 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11234 } 11235 11236 /** 11237 * 11238 * Returns the scrollbar fade duration. 11239 * 11240 * @return the scrollbar fade duration 11241 * 11242 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11243 */ 11244 public int getScrollBarFadeDuration() { 11245 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11246 mScrollCache.scrollBarFadeDuration; 11247 } 11248 11249 /** 11250 * Define the scrollbar fade duration. 11251 * 11252 * @param scrollBarFadeDuration - the scrollbar fade duration 11253 * 11254 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11255 */ 11256 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11257 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11258 } 11259 11260 /** 11261 * 11262 * Returns the scrollbar size. 11263 * 11264 * @return the scrollbar size 11265 * 11266 * @attr ref android.R.styleable#View_scrollbarSize 11267 */ 11268 public int getScrollBarSize() { 11269 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11270 mScrollCache.scrollBarSize; 11271 } 11272 11273 /** 11274 * Define the scrollbar size. 11275 * 11276 * @param scrollBarSize - the scrollbar size 11277 * 11278 * @attr ref android.R.styleable#View_scrollbarSize 11279 */ 11280 public void setScrollBarSize(int scrollBarSize) { 11281 getScrollCache().scrollBarSize = scrollBarSize; 11282 } 11283 11284 /** 11285 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11286 * inset. When inset, they add to the padding of the view. And the scrollbars 11287 * can be drawn inside the padding area or on the edge of the view. For example, 11288 * if a view has a background drawable and you want to draw the scrollbars 11289 * inside the padding specified by the drawable, you can use 11290 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11291 * appear at the edge of the view, ignoring the padding, then you can use 11292 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11293 * @param style the style of the scrollbars. Should be one of 11294 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11295 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11296 * @see #SCROLLBARS_INSIDE_OVERLAY 11297 * @see #SCROLLBARS_INSIDE_INSET 11298 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11299 * @see #SCROLLBARS_OUTSIDE_INSET 11300 * 11301 * @attr ref android.R.styleable#View_scrollbarStyle 11302 */ 11303 public void setScrollBarStyle(int style) { 11304 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11305 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11306 computeOpaqueFlags(); 11307 resolvePadding(); 11308 } 11309 } 11310 11311 /** 11312 * <p>Returns the current scrollbar style.</p> 11313 * @return the current scrollbar style 11314 * @see #SCROLLBARS_INSIDE_OVERLAY 11315 * @see #SCROLLBARS_INSIDE_INSET 11316 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11317 * @see #SCROLLBARS_OUTSIDE_INSET 11318 * 11319 * @attr ref android.R.styleable#View_scrollbarStyle 11320 */ 11321 @ViewDebug.ExportedProperty(mapping = { 11322 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11323 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11324 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11325 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11326 }) 11327 public int getScrollBarStyle() { 11328 return mViewFlags & SCROLLBARS_STYLE_MASK; 11329 } 11330 11331 /** 11332 * <p>Compute the horizontal range that the horizontal scrollbar 11333 * represents.</p> 11334 * 11335 * <p>The range is expressed in arbitrary units that must be the same as the 11336 * units used by {@link #computeHorizontalScrollExtent()} and 11337 * {@link #computeHorizontalScrollOffset()}.</p> 11338 * 11339 * <p>The default range is the drawing width of this view.</p> 11340 * 11341 * @return the total horizontal range represented by the horizontal 11342 * scrollbar 11343 * 11344 * @see #computeHorizontalScrollExtent() 11345 * @see #computeHorizontalScrollOffset() 11346 * @see android.widget.ScrollBarDrawable 11347 */ 11348 protected int computeHorizontalScrollRange() { 11349 return getWidth(); 11350 } 11351 11352 /** 11353 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11354 * within the horizontal range. This value is used to compute the position 11355 * of the thumb within the scrollbar's track.</p> 11356 * 11357 * <p>The range is expressed in arbitrary units that must be the same as the 11358 * units used by {@link #computeHorizontalScrollRange()} and 11359 * {@link #computeHorizontalScrollExtent()}.</p> 11360 * 11361 * <p>The default offset is the scroll offset of this view.</p> 11362 * 11363 * @return the horizontal offset of the scrollbar's thumb 11364 * 11365 * @see #computeHorizontalScrollRange() 11366 * @see #computeHorizontalScrollExtent() 11367 * @see android.widget.ScrollBarDrawable 11368 */ 11369 protected int computeHorizontalScrollOffset() { 11370 return mScrollX; 11371 } 11372 11373 /** 11374 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11375 * within the horizontal range. This value is used to compute the length 11376 * of the thumb within the scrollbar's track.</p> 11377 * 11378 * <p>The range is expressed in arbitrary units that must be the same as the 11379 * units used by {@link #computeHorizontalScrollRange()} and 11380 * {@link #computeHorizontalScrollOffset()}.</p> 11381 * 11382 * <p>The default extent is the drawing width of this view.</p> 11383 * 11384 * @return the horizontal extent of the scrollbar's thumb 11385 * 11386 * @see #computeHorizontalScrollRange() 11387 * @see #computeHorizontalScrollOffset() 11388 * @see android.widget.ScrollBarDrawable 11389 */ 11390 protected int computeHorizontalScrollExtent() { 11391 return getWidth(); 11392 } 11393 11394 /** 11395 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11396 * 11397 * <p>The range is expressed in arbitrary units that must be the same as the 11398 * units used by {@link #computeVerticalScrollExtent()} and 11399 * {@link #computeVerticalScrollOffset()}.</p> 11400 * 11401 * @return the total vertical range represented by the vertical scrollbar 11402 * 11403 * <p>The default range is the drawing height of this view.</p> 11404 * 11405 * @see #computeVerticalScrollExtent() 11406 * @see #computeVerticalScrollOffset() 11407 * @see android.widget.ScrollBarDrawable 11408 */ 11409 protected int computeVerticalScrollRange() { 11410 return getHeight(); 11411 } 11412 11413 /** 11414 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11415 * within the horizontal range. This value is used to compute the position 11416 * of the thumb within the scrollbar's track.</p> 11417 * 11418 * <p>The range is expressed in arbitrary units that must be the same as the 11419 * units used by {@link #computeVerticalScrollRange()} and 11420 * {@link #computeVerticalScrollExtent()}.</p> 11421 * 11422 * <p>The default offset is the scroll offset of this view.</p> 11423 * 11424 * @return the vertical offset of the scrollbar's thumb 11425 * 11426 * @see #computeVerticalScrollRange() 11427 * @see #computeVerticalScrollExtent() 11428 * @see android.widget.ScrollBarDrawable 11429 */ 11430 protected int computeVerticalScrollOffset() { 11431 return mScrollY; 11432 } 11433 11434 /** 11435 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11436 * within the vertical range. This value is used to compute the length 11437 * of the thumb within the scrollbar's track.</p> 11438 * 11439 * <p>The range is expressed in arbitrary units that must be the same as the 11440 * units used by {@link #computeVerticalScrollRange()} and 11441 * {@link #computeVerticalScrollOffset()}.</p> 11442 * 11443 * <p>The default extent is the drawing height of this view.</p> 11444 * 11445 * @return the vertical extent of the scrollbar's thumb 11446 * 11447 * @see #computeVerticalScrollRange() 11448 * @see #computeVerticalScrollOffset() 11449 * @see android.widget.ScrollBarDrawable 11450 */ 11451 protected int computeVerticalScrollExtent() { 11452 return getHeight(); 11453 } 11454 11455 /** 11456 * Check if this view can be scrolled horizontally in a certain direction. 11457 * 11458 * @param direction Negative to check scrolling left, positive to check scrolling right. 11459 * @return true if this view can be scrolled in the specified direction, false otherwise. 11460 */ 11461 public boolean canScrollHorizontally(int direction) { 11462 final int offset = computeHorizontalScrollOffset(); 11463 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11464 if (range == 0) return false; 11465 if (direction < 0) { 11466 return offset > 0; 11467 } else { 11468 return offset < range - 1; 11469 } 11470 } 11471 11472 /** 11473 * Check if this view can be scrolled vertically in a certain direction. 11474 * 11475 * @param direction Negative to check scrolling up, positive to check scrolling down. 11476 * @return true if this view can be scrolled in the specified direction, false otherwise. 11477 */ 11478 public boolean canScrollVertically(int direction) { 11479 final int offset = computeVerticalScrollOffset(); 11480 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11481 if (range == 0) return false; 11482 if (direction < 0) { 11483 return offset > 0; 11484 } else { 11485 return offset < range - 1; 11486 } 11487 } 11488 11489 /** 11490 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11491 * scrollbars are painted only if they have been awakened first.</p> 11492 * 11493 * @param canvas the canvas on which to draw the scrollbars 11494 * 11495 * @see #awakenScrollBars(int) 11496 */ 11497 protected final void onDrawScrollBars(Canvas canvas) { 11498 // scrollbars are drawn only when the animation is running 11499 final ScrollabilityCache cache = mScrollCache; 11500 if (cache != null) { 11501 11502 int state = cache.state; 11503 11504 if (state == ScrollabilityCache.OFF) { 11505 return; 11506 } 11507 11508 boolean invalidate = false; 11509 11510 if (state == ScrollabilityCache.FADING) { 11511 // We're fading -- get our fade interpolation 11512 if (cache.interpolatorValues == null) { 11513 cache.interpolatorValues = new float[1]; 11514 } 11515 11516 float[] values = cache.interpolatorValues; 11517 11518 // Stops the animation if we're done 11519 if (cache.scrollBarInterpolator.timeToValues(values) == 11520 Interpolator.Result.FREEZE_END) { 11521 cache.state = ScrollabilityCache.OFF; 11522 } else { 11523 cache.scrollBar.setAlpha(Math.round(values[0])); 11524 } 11525 11526 // This will make the scroll bars inval themselves after 11527 // drawing. We only want this when we're fading so that 11528 // we prevent excessive redraws 11529 invalidate = true; 11530 } else { 11531 // We're just on -- but we may have been fading before so 11532 // reset alpha 11533 cache.scrollBar.setAlpha(255); 11534 } 11535 11536 11537 final int viewFlags = mViewFlags; 11538 11539 final boolean drawHorizontalScrollBar = 11540 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11541 final boolean drawVerticalScrollBar = 11542 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11543 && !isVerticalScrollBarHidden(); 11544 11545 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11546 final int width = mRight - mLeft; 11547 final int height = mBottom - mTop; 11548 11549 final ScrollBarDrawable scrollBar = cache.scrollBar; 11550 11551 final int scrollX = mScrollX; 11552 final int scrollY = mScrollY; 11553 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11554 11555 int left, top, right, bottom; 11556 11557 if (drawHorizontalScrollBar) { 11558 int size = scrollBar.getSize(false); 11559 if (size <= 0) { 11560 size = cache.scrollBarSize; 11561 } 11562 11563 scrollBar.setParameters(computeHorizontalScrollRange(), 11564 computeHorizontalScrollOffset(), 11565 computeHorizontalScrollExtent(), false); 11566 final int verticalScrollBarGap = drawVerticalScrollBar ? 11567 getVerticalScrollbarWidth() : 0; 11568 top = scrollY + height - size - (mUserPaddingBottom & inside); 11569 left = scrollX + (mPaddingLeft & inside); 11570 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11571 bottom = top + size; 11572 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11573 if (invalidate) { 11574 invalidate(left, top, right, bottom); 11575 } 11576 } 11577 11578 if (drawVerticalScrollBar) { 11579 int size = scrollBar.getSize(true); 11580 if (size <= 0) { 11581 size = cache.scrollBarSize; 11582 } 11583 11584 scrollBar.setParameters(computeVerticalScrollRange(), 11585 computeVerticalScrollOffset(), 11586 computeVerticalScrollExtent(), true); 11587 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11588 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11589 verticalScrollbarPosition = isLayoutRtl() ? 11590 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11591 } 11592 switch (verticalScrollbarPosition) { 11593 default: 11594 case SCROLLBAR_POSITION_RIGHT: 11595 left = scrollX + width - size - (mUserPaddingRight & inside); 11596 break; 11597 case SCROLLBAR_POSITION_LEFT: 11598 left = scrollX + (mUserPaddingLeft & inside); 11599 break; 11600 } 11601 top = scrollY + (mPaddingTop & inside); 11602 right = left + size; 11603 bottom = scrollY + height - (mUserPaddingBottom & inside); 11604 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11605 if (invalidate) { 11606 invalidate(left, top, right, bottom); 11607 } 11608 } 11609 } 11610 } 11611 } 11612 11613 /** 11614 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11615 * FastScroller is visible. 11616 * @return whether to temporarily hide the vertical scrollbar 11617 * @hide 11618 */ 11619 protected boolean isVerticalScrollBarHidden() { 11620 return false; 11621 } 11622 11623 /** 11624 * <p>Draw the horizontal scrollbar if 11625 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11626 * 11627 * @param canvas the canvas on which to draw the scrollbar 11628 * @param scrollBar the scrollbar's drawable 11629 * 11630 * @see #isHorizontalScrollBarEnabled() 11631 * @see #computeHorizontalScrollRange() 11632 * @see #computeHorizontalScrollExtent() 11633 * @see #computeHorizontalScrollOffset() 11634 * @see android.widget.ScrollBarDrawable 11635 * @hide 11636 */ 11637 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11638 int l, int t, int r, int b) { 11639 scrollBar.setBounds(l, t, r, b); 11640 scrollBar.draw(canvas); 11641 } 11642 11643 /** 11644 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11645 * returns true.</p> 11646 * 11647 * @param canvas the canvas on which to draw the scrollbar 11648 * @param scrollBar the scrollbar's drawable 11649 * 11650 * @see #isVerticalScrollBarEnabled() 11651 * @see #computeVerticalScrollRange() 11652 * @see #computeVerticalScrollExtent() 11653 * @see #computeVerticalScrollOffset() 11654 * @see android.widget.ScrollBarDrawable 11655 * @hide 11656 */ 11657 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11658 int l, int t, int r, int b) { 11659 scrollBar.setBounds(l, t, r, b); 11660 scrollBar.draw(canvas); 11661 } 11662 11663 /** 11664 * Implement this to do your drawing. 11665 * 11666 * @param canvas the canvas on which the background will be drawn 11667 */ 11668 protected void onDraw(Canvas canvas) { 11669 } 11670 11671 /* 11672 * Caller is responsible for calling requestLayout if necessary. 11673 * (This allows addViewInLayout to not request a new layout.) 11674 */ 11675 void assignParent(ViewParent parent) { 11676 if (mParent == null) { 11677 mParent = parent; 11678 } else if (parent == null) { 11679 mParent = null; 11680 } else { 11681 throw new RuntimeException("view " + this + " being added, but" 11682 + " it already has a parent"); 11683 } 11684 } 11685 11686 /** 11687 * This is called when the view is attached to a window. At this point it 11688 * has a Surface and will start drawing. Note that this function is 11689 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11690 * however it may be called any time before the first onDraw -- including 11691 * before or after {@link #onMeasure(int, int)}. 11692 * 11693 * @see #onDetachedFromWindow() 11694 */ 11695 protected void onAttachedToWindow() { 11696 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 11697 mParent.requestTransparentRegion(this); 11698 } 11699 11700 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11701 initialAwakenScrollBars(); 11702 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 11703 } 11704 11705 jumpDrawablesToCurrentState(); 11706 11707 clearAccessibilityFocus(); 11708 if (isFocused()) { 11709 InputMethodManager imm = InputMethodManager.peekInstance(); 11710 imm.focusIn(this); 11711 } 11712 11713 if (mDisplayList != null) { 11714 mDisplayList.clearDirty(); 11715 } 11716 } 11717 11718 /** 11719 * Resolve all RTL related properties. 11720 * 11721 * @hide 11722 */ 11723 public void resolveRtlPropertiesIfNeeded() { 11724 if (!needRtlPropertiesResolution()) return; 11725 11726 // Order is important here: LayoutDirection MUST be resolved first 11727 if (!isLayoutDirectionResolved()) { 11728 resolveLayoutDirection(); 11729 resolveLayoutParams(); 11730 } 11731 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 11732 if (!isTextDirectionResolved()) { 11733 resolveTextDirection(); 11734 } 11735 if (!isTextAlignmentResolved()) { 11736 resolveTextAlignment(); 11737 } 11738 if (!isPaddingResolved()) { 11739 resolvePadding(); 11740 } 11741 if (!isDrawablesResolved()) { 11742 resolveDrawables(); 11743 } 11744 onRtlPropertiesChanged(getLayoutDirection()); 11745 } 11746 11747 /** 11748 * Reset resolution of all RTL related properties. 11749 * 11750 * @hide 11751 */ 11752 public void resetRtlProperties() { 11753 resetResolvedLayoutDirection(); 11754 resetResolvedTextDirection(); 11755 resetResolvedTextAlignment(); 11756 resetResolvedPadding(); 11757 resetResolvedDrawables(); 11758 } 11759 11760 /** 11761 * @see #onScreenStateChanged(int) 11762 */ 11763 void dispatchScreenStateChanged(int screenState) { 11764 onScreenStateChanged(screenState); 11765 } 11766 11767 /** 11768 * This method is called whenever the state of the screen this view is 11769 * attached to changes. A state change will usually occurs when the screen 11770 * turns on or off (whether it happens automatically or the user does it 11771 * manually.) 11772 * 11773 * @param screenState The new state of the screen. Can be either 11774 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11775 */ 11776 public void onScreenStateChanged(int screenState) { 11777 } 11778 11779 /** 11780 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11781 */ 11782 private boolean hasRtlSupport() { 11783 return mContext.getApplicationInfo().hasRtlSupport(); 11784 } 11785 11786 /** 11787 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 11788 * RTL not supported) 11789 */ 11790 private boolean isRtlCompatibilityMode() { 11791 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 11792 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 11793 } 11794 11795 /** 11796 * @return true if RTL properties need resolution. 11797 */ 11798 private boolean needRtlPropertiesResolution() { 11799 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 11800 } 11801 11802 /** 11803 * Called when any RTL property (layout direction or text direction or text alignment) has 11804 * been changed. 11805 * 11806 * Subclasses need to override this method to take care of cached information that depends on the 11807 * resolved layout direction, or to inform child views that inherit their layout direction. 11808 * 11809 * The default implementation does nothing. 11810 * 11811 * @param layoutDirection the direction of the layout 11812 * 11813 * @see #LAYOUT_DIRECTION_LTR 11814 * @see #LAYOUT_DIRECTION_RTL 11815 */ 11816 public void onRtlPropertiesChanged(int layoutDirection) { 11817 } 11818 11819 /** 11820 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11821 * that the parent directionality can and will be resolved before its children. 11822 * 11823 * @return true if resolution has been done, false otherwise. 11824 * 11825 * @hide 11826 */ 11827 public boolean resolveLayoutDirection() { 11828 // Clear any previous layout direction resolution 11829 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11830 11831 if (hasRtlSupport()) { 11832 // Set resolved depending on layout direction 11833 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 11834 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 11835 case LAYOUT_DIRECTION_INHERIT: 11836 // We cannot resolve yet. LTR is by default and let the resolution happen again 11837 // later to get the correct resolved value 11838 if (!canResolveLayoutDirection()) return false; 11839 11840 // Parent has not yet resolved, LTR is still the default 11841 if (!mParent.isLayoutDirectionResolved()) return false; 11842 11843 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11844 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11845 } 11846 break; 11847 case LAYOUT_DIRECTION_RTL: 11848 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11849 break; 11850 case LAYOUT_DIRECTION_LOCALE: 11851 if((LAYOUT_DIRECTION_RTL == 11852 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 11853 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11854 } 11855 break; 11856 default: 11857 // Nothing to do, LTR by default 11858 } 11859 } 11860 11861 // Set to resolved 11862 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11863 return true; 11864 } 11865 11866 /** 11867 * Check if layout direction resolution can be done. 11868 * 11869 * @return true if layout direction resolution can be done otherwise return false. 11870 * 11871 * @hide 11872 */ 11873 public boolean canResolveLayoutDirection() { 11874 switch (getRawLayoutDirection()) { 11875 case LAYOUT_DIRECTION_INHERIT: 11876 return (mParent != null) && mParent.canResolveLayoutDirection(); 11877 default: 11878 return true; 11879 } 11880 } 11881 11882 /** 11883 * Reset the resolved layout direction. Layout direction will be resolved during a call to 11884 * {@link #onMeasure(int, int)}. 11885 * 11886 * @hide 11887 */ 11888 public void resetResolvedLayoutDirection() { 11889 // Reset the current resolved bits 11890 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11891 } 11892 11893 /** 11894 * @return true if the layout direction is inherited. 11895 * 11896 * @hide 11897 */ 11898 public boolean isLayoutDirectionInherited() { 11899 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 11900 } 11901 11902 /** 11903 * @return true if layout direction has been resolved. 11904 * @hide 11905 */ 11906 public boolean isLayoutDirectionResolved() { 11907 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11908 } 11909 11910 /** 11911 * Return if padding has been resolved 11912 * 11913 * @hide 11914 */ 11915 boolean isPaddingResolved() { 11916 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 11917 } 11918 11919 /** 11920 * Resolve padding depending on layout direction. 11921 * 11922 * @hide 11923 */ 11924 public void resolvePadding() { 11925 if (!isRtlCompatibilityMode()) { 11926 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 11927 // If start / end padding are defined, they will be resolved (hence overriding) to 11928 // left / right or right / left depending on the resolved layout direction. 11929 // If start / end padding are not defined, use the left / right ones. 11930 int resolvedLayoutDirection = getLayoutDirection(); 11931 // Set user padding to initial values ... 11932 mUserPaddingLeft = mUserPaddingLeftInitial; 11933 mUserPaddingRight = mUserPaddingRightInitial; 11934 // ... then resolve it. 11935 switch (resolvedLayoutDirection) { 11936 case LAYOUT_DIRECTION_RTL: 11937 if (mUserPaddingStart != UNDEFINED_PADDING) { 11938 mUserPaddingRight = mUserPaddingStart; 11939 } 11940 if (mUserPaddingEnd != UNDEFINED_PADDING) { 11941 mUserPaddingLeft = mUserPaddingEnd; 11942 } 11943 break; 11944 case LAYOUT_DIRECTION_LTR: 11945 default: 11946 if (mUserPaddingStart != UNDEFINED_PADDING) { 11947 mUserPaddingLeft = mUserPaddingStart; 11948 } 11949 if (mUserPaddingEnd != UNDEFINED_PADDING) { 11950 mUserPaddingRight = mUserPaddingEnd; 11951 } 11952 } 11953 11954 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11955 11956 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, 11957 mUserPaddingBottom); 11958 onRtlPropertiesChanged(resolvedLayoutDirection); 11959 } 11960 11961 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 11962 } 11963 11964 /** 11965 * Reset the resolved layout direction. 11966 * 11967 * @hide 11968 */ 11969 public void resetResolvedPadding() { 11970 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 11971 } 11972 11973 /** 11974 * This is called when the view is detached from a window. At this point it 11975 * no longer has a surface for drawing. 11976 * 11977 * @see #onAttachedToWindow() 11978 */ 11979 protected void onDetachedFromWindow() { 11980 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 11981 11982 removeUnsetPressCallback(); 11983 removeLongPressCallback(); 11984 removePerformClickCallback(); 11985 removeSendViewScrolledAccessibilityEventCallback(); 11986 11987 destroyDrawingCache(); 11988 11989 destroyLayer(false); 11990 11991 if (mAttachInfo != null) { 11992 if (mDisplayList != null) { 11993 mDisplayList.markDirty(); 11994 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11995 } 11996 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11997 } else { 11998 // Should never happen 11999 clearDisplayList(); 12000 } 12001 12002 mCurrentAnimation = null; 12003 12004 resetAccessibilityStateChanged(); 12005 } 12006 12007 /** 12008 * @return The number of times this view has been attached to a window 12009 */ 12010 protected int getWindowAttachCount() { 12011 return mWindowAttachCount; 12012 } 12013 12014 /** 12015 * Retrieve a unique token identifying the window this view is attached to. 12016 * @return Return the window's token for use in 12017 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 12018 */ 12019 public IBinder getWindowToken() { 12020 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 12021 } 12022 12023 /** 12024 * Retrieve the {@link WindowId} for the window this view is 12025 * currently attached to. 12026 */ 12027 public WindowId getWindowId() { 12028 if (mAttachInfo == null) { 12029 return null; 12030 } 12031 if (mAttachInfo.mWindowId == null) { 12032 try { 12033 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 12034 mAttachInfo.mWindowToken); 12035 mAttachInfo.mWindowId = new WindowId( 12036 mAttachInfo.mIWindowId); 12037 } catch (RemoteException e) { 12038 } 12039 } 12040 return mAttachInfo.mWindowId; 12041 } 12042 12043 /** 12044 * Retrieve a unique token identifying the top-level "real" window of 12045 * the window that this view is attached to. That is, this is like 12046 * {@link #getWindowToken}, except if the window this view in is a panel 12047 * window (attached to another containing window), then the token of 12048 * the containing window is returned instead. 12049 * 12050 * @return Returns the associated window token, either 12051 * {@link #getWindowToken()} or the containing window's token. 12052 */ 12053 public IBinder getApplicationWindowToken() { 12054 AttachInfo ai = mAttachInfo; 12055 if (ai != null) { 12056 IBinder appWindowToken = ai.mPanelParentWindowToken; 12057 if (appWindowToken == null) { 12058 appWindowToken = ai.mWindowToken; 12059 } 12060 return appWindowToken; 12061 } 12062 return null; 12063 } 12064 12065 /** 12066 * Gets the logical display to which the view's window has been attached. 12067 * 12068 * @return The logical display, or null if the view is not currently attached to a window. 12069 */ 12070 public Display getDisplay() { 12071 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 12072 } 12073 12074 /** 12075 * Retrieve private session object this view hierarchy is using to 12076 * communicate with the window manager. 12077 * @return the session object to communicate with the window manager 12078 */ 12079 /*package*/ IWindowSession getWindowSession() { 12080 return mAttachInfo != null ? mAttachInfo.mSession : null; 12081 } 12082 12083 /** 12084 * @param info the {@link android.view.View.AttachInfo} to associated with 12085 * this view 12086 */ 12087 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 12088 //System.out.println("Attached! " + this); 12089 mAttachInfo = info; 12090 mWindowAttachCount++; 12091 // We will need to evaluate the drawable state at least once. 12092 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 12093 if (mFloatingTreeObserver != null) { 12094 info.mTreeObserver.merge(mFloatingTreeObserver); 12095 mFloatingTreeObserver = null; 12096 } 12097 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 12098 mAttachInfo.mScrollContainers.add(this); 12099 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 12100 } 12101 performCollectViewAttributes(mAttachInfo, visibility); 12102 onAttachedToWindow(); 12103 12104 ListenerInfo li = mListenerInfo; 12105 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12106 li != null ? li.mOnAttachStateChangeListeners : null; 12107 if (listeners != null && listeners.size() > 0) { 12108 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12109 // perform the dispatching. The iterator is a safe guard against listeners that 12110 // could mutate the list by calling the various add/remove methods. This prevents 12111 // the array from being modified while we iterate it. 12112 for (OnAttachStateChangeListener listener : listeners) { 12113 listener.onViewAttachedToWindow(this); 12114 } 12115 } 12116 12117 int vis = info.mWindowVisibility; 12118 if (vis != GONE) { 12119 onWindowVisibilityChanged(vis); 12120 } 12121 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 12122 // If nobody has evaluated the drawable state yet, then do it now. 12123 refreshDrawableState(); 12124 } 12125 needGlobalAttributesUpdate(false); 12126 } 12127 12128 void dispatchDetachedFromWindow() { 12129 AttachInfo info = mAttachInfo; 12130 if (info != null) { 12131 int vis = info.mWindowVisibility; 12132 if (vis != GONE) { 12133 onWindowVisibilityChanged(GONE); 12134 } 12135 } 12136 12137 onDetachedFromWindow(); 12138 12139 ListenerInfo li = mListenerInfo; 12140 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12141 li != null ? li.mOnAttachStateChangeListeners : null; 12142 if (listeners != null && listeners.size() > 0) { 12143 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12144 // perform the dispatching. The iterator is a safe guard against listeners that 12145 // could mutate the list by calling the various add/remove methods. This prevents 12146 // the array from being modified while we iterate it. 12147 for (OnAttachStateChangeListener listener : listeners) { 12148 listener.onViewDetachedFromWindow(this); 12149 } 12150 } 12151 12152 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 12153 mAttachInfo.mScrollContainers.remove(this); 12154 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 12155 } 12156 12157 mAttachInfo = null; 12158 } 12159 12160 /** 12161 * Store this view hierarchy's frozen state into the given container. 12162 * 12163 * @param container The SparseArray in which to save the view's state. 12164 * 12165 * @see #restoreHierarchyState(android.util.SparseArray) 12166 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12167 * @see #onSaveInstanceState() 12168 */ 12169 public void saveHierarchyState(SparseArray<Parcelable> container) { 12170 dispatchSaveInstanceState(container); 12171 } 12172 12173 /** 12174 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 12175 * this view and its children. May be overridden to modify how freezing happens to a 12176 * view's children; for example, some views may want to not store state for their children. 12177 * 12178 * @param container The SparseArray in which to save the view's state. 12179 * 12180 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12181 * @see #saveHierarchyState(android.util.SparseArray) 12182 * @see #onSaveInstanceState() 12183 */ 12184 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 12185 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 12186 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12187 Parcelable state = onSaveInstanceState(); 12188 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12189 throw new IllegalStateException( 12190 "Derived class did not call super.onSaveInstanceState()"); 12191 } 12192 if (state != null) { 12193 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12194 // + ": " + state); 12195 container.put(mID, state); 12196 } 12197 } 12198 } 12199 12200 /** 12201 * Hook allowing a view to generate a representation of its internal state 12202 * that can later be used to create a new instance with that same state. 12203 * This state should only contain information that is not persistent or can 12204 * not be reconstructed later. For example, you will never store your 12205 * current position on screen because that will be computed again when a 12206 * new instance of the view is placed in its view hierarchy. 12207 * <p> 12208 * Some examples of things you may store here: the current cursor position 12209 * in a text view (but usually not the text itself since that is stored in a 12210 * content provider or other persistent storage), the currently selected 12211 * item in a list view. 12212 * 12213 * @return Returns a Parcelable object containing the view's current dynamic 12214 * state, or null if there is nothing interesting to save. The 12215 * default implementation returns null. 12216 * @see #onRestoreInstanceState(android.os.Parcelable) 12217 * @see #saveHierarchyState(android.util.SparseArray) 12218 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12219 * @see #setSaveEnabled(boolean) 12220 */ 12221 protected Parcelable onSaveInstanceState() { 12222 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12223 return BaseSavedState.EMPTY_STATE; 12224 } 12225 12226 /** 12227 * Restore this view hierarchy's frozen state from the given container. 12228 * 12229 * @param container The SparseArray which holds previously frozen states. 12230 * 12231 * @see #saveHierarchyState(android.util.SparseArray) 12232 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12233 * @see #onRestoreInstanceState(android.os.Parcelable) 12234 */ 12235 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12236 dispatchRestoreInstanceState(container); 12237 } 12238 12239 /** 12240 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12241 * state for this view and its children. May be overridden to modify how restoring 12242 * happens to a view's children; for example, some views may want to not store state 12243 * for their children. 12244 * 12245 * @param container The SparseArray which holds previously saved state. 12246 * 12247 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12248 * @see #restoreHierarchyState(android.util.SparseArray) 12249 * @see #onRestoreInstanceState(android.os.Parcelable) 12250 */ 12251 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12252 if (mID != NO_ID) { 12253 Parcelable state = container.get(mID); 12254 if (state != null) { 12255 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12256 // + ": " + state); 12257 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12258 onRestoreInstanceState(state); 12259 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12260 throw new IllegalStateException( 12261 "Derived class did not call super.onRestoreInstanceState()"); 12262 } 12263 } 12264 } 12265 } 12266 12267 /** 12268 * Hook allowing a view to re-apply a representation of its internal state that had previously 12269 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12270 * null state. 12271 * 12272 * @param state The frozen state that had previously been returned by 12273 * {@link #onSaveInstanceState}. 12274 * 12275 * @see #onSaveInstanceState() 12276 * @see #restoreHierarchyState(android.util.SparseArray) 12277 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12278 */ 12279 protected void onRestoreInstanceState(Parcelable state) { 12280 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12281 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12282 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12283 + "received " + state.getClass().toString() + " instead. This usually happens " 12284 + "when two views of different type have the same id in the same hierarchy. " 12285 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12286 + "other views do not use the same id."); 12287 } 12288 } 12289 12290 /** 12291 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12292 * 12293 * @return the drawing start time in milliseconds 12294 */ 12295 public long getDrawingTime() { 12296 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12297 } 12298 12299 /** 12300 * <p>Enables or disables the duplication of the parent's state into this view. When 12301 * duplication is enabled, this view gets its drawable state from its parent rather 12302 * than from its own internal properties.</p> 12303 * 12304 * <p>Note: in the current implementation, setting this property to true after the 12305 * view was added to a ViewGroup might have no effect at all. This property should 12306 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12307 * 12308 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12309 * property is enabled, an exception will be thrown.</p> 12310 * 12311 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12312 * parent, these states should not be affected by this method.</p> 12313 * 12314 * @param enabled True to enable duplication of the parent's drawable state, false 12315 * to disable it. 12316 * 12317 * @see #getDrawableState() 12318 * @see #isDuplicateParentStateEnabled() 12319 */ 12320 public void setDuplicateParentStateEnabled(boolean enabled) { 12321 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12322 } 12323 12324 /** 12325 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12326 * 12327 * @return True if this view's drawable state is duplicated from the parent, 12328 * false otherwise 12329 * 12330 * @see #getDrawableState() 12331 * @see #setDuplicateParentStateEnabled(boolean) 12332 */ 12333 public boolean isDuplicateParentStateEnabled() { 12334 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12335 } 12336 12337 /** 12338 * <p>Specifies the type of layer backing this view. The layer can be 12339 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 12340 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 12341 * 12342 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12343 * instance that controls how the layer is composed on screen. The following 12344 * properties of the paint are taken into account when composing the layer:</p> 12345 * <ul> 12346 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12347 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12348 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12349 * </ul> 12350 * 12351 * <p>If this view has an alpha value set to < 1.0 by calling 12352 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 12353 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 12354 * equivalent to setting a hardware layer on this view and providing a paint with 12355 * the desired alpha value.</p> 12356 * 12357 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 12358 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 12359 * for more information on when and how to use layers.</p> 12360 * 12361 * @param layerType The type of layer to use with this view, must be one of 12362 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12363 * {@link #LAYER_TYPE_HARDWARE} 12364 * @param paint The paint used to compose the layer. This argument is optional 12365 * and can be null. It is ignored when the layer type is 12366 * {@link #LAYER_TYPE_NONE} 12367 * 12368 * @see #getLayerType() 12369 * @see #LAYER_TYPE_NONE 12370 * @see #LAYER_TYPE_SOFTWARE 12371 * @see #LAYER_TYPE_HARDWARE 12372 * @see #setAlpha(float) 12373 * 12374 * @attr ref android.R.styleable#View_layerType 12375 */ 12376 public void setLayerType(int layerType, Paint paint) { 12377 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12378 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12379 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12380 } 12381 12382 if (layerType == mLayerType) { 12383 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12384 mLayerPaint = paint == null ? new Paint() : paint; 12385 invalidateParentCaches(); 12386 invalidate(true); 12387 } 12388 return; 12389 } 12390 12391 // Destroy any previous software drawing cache if needed 12392 switch (mLayerType) { 12393 case LAYER_TYPE_HARDWARE: 12394 destroyLayer(false); 12395 // fall through - non-accelerated views may use software layer mechanism instead 12396 case LAYER_TYPE_SOFTWARE: 12397 destroyDrawingCache(); 12398 break; 12399 default: 12400 break; 12401 } 12402 12403 mLayerType = layerType; 12404 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12405 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12406 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12407 12408 invalidateParentCaches(); 12409 invalidate(true); 12410 } 12411 12412 /** 12413 * Updates the {@link Paint} object used with the current layer (used only if the current 12414 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12415 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12416 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12417 * ensure that the view gets redrawn immediately. 12418 * 12419 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12420 * instance that controls how the layer is composed on screen. The following 12421 * properties of the paint are taken into account when composing the layer:</p> 12422 * <ul> 12423 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12424 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12425 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12426 * </ul> 12427 * 12428 * <p>If this view has an alpha value set to < 1.0 by calling 12429 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 12430 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 12431 * equivalent to setting a hardware layer on this view and providing a paint with 12432 * the desired alpha value.</p> 12433 * 12434 * @param paint The paint used to compose the layer. This argument is optional 12435 * and can be null. It is ignored when the layer type is 12436 * {@link #LAYER_TYPE_NONE} 12437 * 12438 * @see #setLayerType(int, android.graphics.Paint) 12439 */ 12440 public void setLayerPaint(Paint paint) { 12441 int layerType = getLayerType(); 12442 if (layerType != LAYER_TYPE_NONE) { 12443 mLayerPaint = paint == null ? new Paint() : paint; 12444 if (layerType == LAYER_TYPE_HARDWARE) { 12445 HardwareLayer layer = getHardwareLayer(); 12446 if (layer != null) { 12447 layer.setLayerPaint(paint); 12448 } 12449 invalidateViewProperty(false, false); 12450 } else { 12451 invalidate(); 12452 } 12453 } 12454 } 12455 12456 /** 12457 * Indicates whether this view has a static layer. A view with layer type 12458 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12459 * dynamic. 12460 */ 12461 boolean hasStaticLayer() { 12462 return true; 12463 } 12464 12465 /** 12466 * Indicates what type of layer is currently associated with this view. By default 12467 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12468 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12469 * for more information on the different types of layers. 12470 * 12471 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12472 * {@link #LAYER_TYPE_HARDWARE} 12473 * 12474 * @see #setLayerType(int, android.graphics.Paint) 12475 * @see #buildLayer() 12476 * @see #LAYER_TYPE_NONE 12477 * @see #LAYER_TYPE_SOFTWARE 12478 * @see #LAYER_TYPE_HARDWARE 12479 */ 12480 public int getLayerType() { 12481 return mLayerType; 12482 } 12483 12484 /** 12485 * Forces this view's layer to be created and this view to be rendered 12486 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 12487 * invoking this method will have no effect. 12488 * 12489 * This method can for instance be used to render a view into its layer before 12490 * starting an animation. If this view is complex, rendering into the layer 12491 * before starting the animation will avoid skipping frames. 12492 * 12493 * @throws IllegalStateException If this view is not attached to a window 12494 * 12495 * @see #setLayerType(int, android.graphics.Paint) 12496 */ 12497 public void buildLayer() { 12498 if (mLayerType == LAYER_TYPE_NONE) return; 12499 12500 if (mAttachInfo == null) { 12501 throw new IllegalStateException("This view must be attached to a window first"); 12502 } 12503 12504 switch (mLayerType) { 12505 case LAYER_TYPE_HARDWARE: 12506 if (mAttachInfo.mHardwareRenderer != null && 12507 mAttachInfo.mHardwareRenderer.isEnabled() && 12508 mAttachInfo.mHardwareRenderer.validate()) { 12509 getHardwareLayer(); 12510 } 12511 break; 12512 case LAYER_TYPE_SOFTWARE: 12513 buildDrawingCache(true); 12514 break; 12515 } 12516 } 12517 12518 /** 12519 * <p>Returns a hardware layer that can be used to draw this view again 12520 * without executing its draw method.</p> 12521 * 12522 * @return A HardwareLayer ready to render, or null if an error occurred. 12523 */ 12524 HardwareLayer getHardwareLayer() { 12525 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 12526 !mAttachInfo.mHardwareRenderer.isEnabled()) { 12527 return null; 12528 } 12529 12530 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 12531 12532 final int width = mRight - mLeft; 12533 final int height = mBottom - mTop; 12534 12535 if (width == 0 || height == 0) { 12536 return null; 12537 } 12538 12539 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 12540 if (mHardwareLayer == null) { 12541 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 12542 width, height, isOpaque()); 12543 mLocalDirtyRect.set(0, 0, width, height); 12544 } else { 12545 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 12546 if (mHardwareLayer.resize(width, height)) { 12547 mLocalDirtyRect.set(0, 0, width, height); 12548 } 12549 } 12550 12551 // This should not be necessary but applications that change 12552 // the parameters of their background drawable without calling 12553 // this.setBackground(Drawable) can leave the view in a bad state 12554 // (for instance isOpaque() returns true, but the background is 12555 // not opaque.) 12556 computeOpaqueFlags(); 12557 12558 final boolean opaque = isOpaque(); 12559 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 12560 mHardwareLayer.setOpaque(opaque); 12561 mLocalDirtyRect.set(0, 0, width, height); 12562 } 12563 } 12564 12565 // The layer is not valid if the underlying GPU resources cannot be allocated 12566 if (!mHardwareLayer.isValid()) { 12567 return null; 12568 } 12569 12570 mHardwareLayer.setLayerPaint(mLayerPaint); 12571 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 12572 ViewRootImpl viewRoot = getViewRootImpl(); 12573 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 12574 12575 mLocalDirtyRect.setEmpty(); 12576 } 12577 12578 return mHardwareLayer; 12579 } 12580 12581 /** 12582 * Destroys this View's hardware layer if possible. 12583 * 12584 * @return True if the layer was destroyed, false otherwise. 12585 * 12586 * @see #setLayerType(int, android.graphics.Paint) 12587 * @see #LAYER_TYPE_HARDWARE 12588 */ 12589 boolean destroyLayer(boolean valid) { 12590 if (mHardwareLayer != null) { 12591 AttachInfo info = mAttachInfo; 12592 if (info != null && info.mHardwareRenderer != null && 12593 info.mHardwareRenderer.isEnabled() && 12594 (valid || info.mHardwareRenderer.validate())) { 12595 mHardwareLayer.destroy(); 12596 mHardwareLayer = null; 12597 12598 if (mDisplayList != null) { 12599 mDisplayList.reset(); 12600 } 12601 invalidate(true); 12602 invalidateParentCaches(); 12603 } 12604 return true; 12605 } 12606 return false; 12607 } 12608 12609 /** 12610 * Destroys all hardware rendering resources. This method is invoked 12611 * when the system needs to reclaim resources. Upon execution of this 12612 * method, you should free any OpenGL resources created by the view. 12613 * 12614 * Note: you <strong>must</strong> call 12615 * <code>super.destroyHardwareResources()</code> when overriding 12616 * this method. 12617 * 12618 * @hide 12619 */ 12620 protected void destroyHardwareResources() { 12621 destroyLayer(true); 12622 } 12623 12624 /** 12625 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12626 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12627 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12628 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12629 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12630 * null.</p> 12631 * 12632 * <p>Enabling the drawing cache is similar to 12633 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12634 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12635 * drawing cache has no effect on rendering because the system uses a different mechanism 12636 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12637 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12638 * for information on how to enable software and hardware layers.</p> 12639 * 12640 * <p>This API can be used to manually generate 12641 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12642 * {@link #getDrawingCache()}.</p> 12643 * 12644 * @param enabled true to enable the drawing cache, false otherwise 12645 * 12646 * @see #isDrawingCacheEnabled() 12647 * @see #getDrawingCache() 12648 * @see #buildDrawingCache() 12649 * @see #setLayerType(int, android.graphics.Paint) 12650 */ 12651 public void setDrawingCacheEnabled(boolean enabled) { 12652 mCachingFailed = false; 12653 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12654 } 12655 12656 /** 12657 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12658 * 12659 * @return true if the drawing cache is enabled 12660 * 12661 * @see #setDrawingCacheEnabled(boolean) 12662 * @see #getDrawingCache() 12663 */ 12664 @ViewDebug.ExportedProperty(category = "drawing") 12665 public boolean isDrawingCacheEnabled() { 12666 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12667 } 12668 12669 /** 12670 * Debugging utility which recursively outputs the dirty state of a view and its 12671 * descendants. 12672 * 12673 * @hide 12674 */ 12675 @SuppressWarnings({"UnusedDeclaration"}) 12676 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12677 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 12678 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 12679 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 12680 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 12681 if (clear) { 12682 mPrivateFlags &= clearMask; 12683 } 12684 if (this instanceof ViewGroup) { 12685 ViewGroup parent = (ViewGroup) this; 12686 final int count = parent.getChildCount(); 12687 for (int i = 0; i < count; i++) { 12688 final View child = parent.getChildAt(i); 12689 child.outputDirtyFlags(indent + " ", clear, clearMask); 12690 } 12691 } 12692 } 12693 12694 /** 12695 * This method is used by ViewGroup to cause its children to restore or recreate their 12696 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12697 * to recreate its own display list, which would happen if it went through the normal 12698 * draw/dispatchDraw mechanisms. 12699 * 12700 * @hide 12701 */ 12702 protected void dispatchGetDisplayList() {} 12703 12704 /** 12705 * A view that is not attached or hardware accelerated cannot create a display list. 12706 * This method checks these conditions and returns the appropriate result. 12707 * 12708 * @return true if view has the ability to create a display list, false otherwise. 12709 * 12710 * @hide 12711 */ 12712 public boolean canHaveDisplayList() { 12713 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12714 } 12715 12716 /** 12717 * @return The {@link HardwareRenderer} associated with that view or null if 12718 * hardware rendering is not supported or this view is not attached 12719 * to a window. 12720 * 12721 * @hide 12722 */ 12723 public HardwareRenderer getHardwareRenderer() { 12724 if (mAttachInfo != null) { 12725 return mAttachInfo.mHardwareRenderer; 12726 } 12727 return null; 12728 } 12729 12730 /** 12731 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12732 * Otherwise, the same display list will be returned (after having been rendered into 12733 * along the way, depending on the invalidation state of the view). 12734 * 12735 * @param displayList The previous version of this displayList, could be null. 12736 * @param isLayer Whether the requester of the display list is a layer. If so, 12737 * the view will avoid creating a layer inside the resulting display list. 12738 * @return A new or reused DisplayList object. 12739 */ 12740 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12741 if (!canHaveDisplayList()) { 12742 return null; 12743 } 12744 12745 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 12746 displayList == null || !displayList.isValid() || 12747 (!isLayer && mRecreateDisplayList))) { 12748 // Don't need to recreate the display list, just need to tell our 12749 // children to restore/recreate theirs 12750 if (displayList != null && displayList.isValid() && 12751 !isLayer && !mRecreateDisplayList) { 12752 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12753 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12754 dispatchGetDisplayList(); 12755 12756 return displayList; 12757 } 12758 12759 if (!isLayer) { 12760 // If we got here, we're recreating it. Mark it as such to ensure that 12761 // we copy in child display lists into ours in drawChild() 12762 mRecreateDisplayList = true; 12763 } 12764 if (displayList == null) { 12765 final String name = getClass().getSimpleName(); 12766 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12767 // If we're creating a new display list, make sure our parent gets invalidated 12768 // since they will need to recreate their display list to account for this 12769 // new child display list. 12770 invalidateParentCaches(); 12771 } 12772 12773 boolean caching = false; 12774 int width = mRight - mLeft; 12775 int height = mBottom - mTop; 12776 int layerType = getLayerType(); 12777 12778 final HardwareCanvas canvas = displayList.start(width, height); 12779 12780 try { 12781 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12782 if (layerType == LAYER_TYPE_HARDWARE) { 12783 final HardwareLayer layer = getHardwareLayer(); 12784 if (layer != null && layer.isValid()) { 12785 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12786 } else { 12787 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12788 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12789 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12790 } 12791 caching = true; 12792 } else { 12793 buildDrawingCache(true); 12794 Bitmap cache = getDrawingCache(true); 12795 if (cache != null) { 12796 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12797 caching = true; 12798 } 12799 } 12800 } else { 12801 12802 computeScroll(); 12803 12804 canvas.translate(-mScrollX, -mScrollY); 12805 if (!isLayer) { 12806 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12807 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12808 } 12809 12810 // Fast path for layouts with no backgrounds 12811 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 12812 dispatchDraw(canvas); 12813 } else { 12814 draw(canvas); 12815 } 12816 } 12817 } finally { 12818 displayList.end(); 12819 displayList.setCaching(caching); 12820 if (isLayer) { 12821 displayList.setLeftTopRightBottom(0, 0, width, height); 12822 } else { 12823 setDisplayListProperties(displayList); 12824 } 12825 } 12826 } else if (!isLayer) { 12827 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12828 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12829 } 12830 12831 return displayList; 12832 } 12833 12834 /** 12835 * Get the DisplayList for the HardwareLayer 12836 * 12837 * @param layer The HardwareLayer whose DisplayList we want 12838 * @return A DisplayList fopr the specified HardwareLayer 12839 */ 12840 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12841 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12842 layer.setDisplayList(displayList); 12843 return displayList; 12844 } 12845 12846 12847 /** 12848 * <p>Returns a display list that can be used to draw this view again 12849 * without executing its draw method.</p> 12850 * 12851 * @return A DisplayList ready to replay, or null if caching is not enabled. 12852 * 12853 * @hide 12854 */ 12855 public DisplayList getDisplayList() { 12856 mDisplayList = getDisplayList(mDisplayList, false); 12857 return mDisplayList; 12858 } 12859 12860 private void clearDisplayList() { 12861 if (mDisplayList != null) { 12862 mDisplayList.clear(); 12863 } 12864 } 12865 12866 /** 12867 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12868 * 12869 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12870 * 12871 * @see #getDrawingCache(boolean) 12872 */ 12873 public Bitmap getDrawingCache() { 12874 return getDrawingCache(false); 12875 } 12876 12877 /** 12878 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12879 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12880 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12881 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12882 * request the drawing cache by calling this method and draw it on screen if the 12883 * returned bitmap is not null.</p> 12884 * 12885 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12886 * this method will create a bitmap of the same size as this view. Because this bitmap 12887 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12888 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12889 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12890 * size than the view. This implies that your application must be able to handle this 12891 * size.</p> 12892 * 12893 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12894 * the current density of the screen when the application is in compatibility 12895 * mode. 12896 * 12897 * @return A bitmap representing this view or null if cache is disabled. 12898 * 12899 * @see #setDrawingCacheEnabled(boolean) 12900 * @see #isDrawingCacheEnabled() 12901 * @see #buildDrawingCache(boolean) 12902 * @see #destroyDrawingCache() 12903 */ 12904 public Bitmap getDrawingCache(boolean autoScale) { 12905 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12906 return null; 12907 } 12908 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12909 buildDrawingCache(autoScale); 12910 } 12911 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12912 } 12913 12914 /** 12915 * <p>Frees the resources used by the drawing cache. If you call 12916 * {@link #buildDrawingCache()} manually without calling 12917 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12918 * should cleanup the cache with this method afterwards.</p> 12919 * 12920 * @see #setDrawingCacheEnabled(boolean) 12921 * @see #buildDrawingCache() 12922 * @see #getDrawingCache() 12923 */ 12924 public void destroyDrawingCache() { 12925 if (mDrawingCache != null) { 12926 mDrawingCache.recycle(); 12927 mDrawingCache = null; 12928 } 12929 if (mUnscaledDrawingCache != null) { 12930 mUnscaledDrawingCache.recycle(); 12931 mUnscaledDrawingCache = null; 12932 } 12933 } 12934 12935 /** 12936 * Setting a solid background color for the drawing cache's bitmaps will improve 12937 * performance and memory usage. Note, though that this should only be used if this 12938 * view will always be drawn on top of a solid color. 12939 * 12940 * @param color The background color to use for the drawing cache's bitmap 12941 * 12942 * @see #setDrawingCacheEnabled(boolean) 12943 * @see #buildDrawingCache() 12944 * @see #getDrawingCache() 12945 */ 12946 public void setDrawingCacheBackgroundColor(int color) { 12947 if (color != mDrawingCacheBackgroundColor) { 12948 mDrawingCacheBackgroundColor = color; 12949 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 12950 } 12951 } 12952 12953 /** 12954 * @see #setDrawingCacheBackgroundColor(int) 12955 * 12956 * @return The background color to used for the drawing cache's bitmap 12957 */ 12958 public int getDrawingCacheBackgroundColor() { 12959 return mDrawingCacheBackgroundColor; 12960 } 12961 12962 /** 12963 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12964 * 12965 * @see #buildDrawingCache(boolean) 12966 */ 12967 public void buildDrawingCache() { 12968 buildDrawingCache(false); 12969 } 12970 12971 /** 12972 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12973 * 12974 * <p>If you call {@link #buildDrawingCache()} manually without calling 12975 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12976 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12977 * 12978 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12979 * this method will create a bitmap of the same size as this view. Because this bitmap 12980 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12981 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12982 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12983 * size than the view. This implies that your application must be able to handle this 12984 * size.</p> 12985 * 12986 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12987 * you do not need the drawing cache bitmap, calling this method will increase memory 12988 * usage and cause the view to be rendered in software once, thus negatively impacting 12989 * performance.</p> 12990 * 12991 * @see #getDrawingCache() 12992 * @see #destroyDrawingCache() 12993 */ 12994 public void buildDrawingCache(boolean autoScale) { 12995 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 12996 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12997 mCachingFailed = false; 12998 12999 int width = mRight - mLeft; 13000 int height = mBottom - mTop; 13001 13002 final AttachInfo attachInfo = mAttachInfo; 13003 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 13004 13005 if (autoScale && scalingRequired) { 13006 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 13007 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 13008 } 13009 13010 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 13011 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 13012 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 13013 13014 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 13015 final long drawingCacheSize = 13016 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 13017 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 13018 if (width > 0 && height > 0) { 13019 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 13020 + projectedBitmapSize + " bytes, only " 13021 + drawingCacheSize + " available"); 13022 } 13023 destroyDrawingCache(); 13024 mCachingFailed = true; 13025 return; 13026 } 13027 13028 boolean clear = true; 13029 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 13030 13031 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 13032 Bitmap.Config quality; 13033 if (!opaque) { 13034 // Never pick ARGB_4444 because it looks awful 13035 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 13036 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 13037 case DRAWING_CACHE_QUALITY_AUTO: 13038 quality = Bitmap.Config.ARGB_8888; 13039 break; 13040 case DRAWING_CACHE_QUALITY_LOW: 13041 quality = Bitmap.Config.ARGB_8888; 13042 break; 13043 case DRAWING_CACHE_QUALITY_HIGH: 13044 quality = Bitmap.Config.ARGB_8888; 13045 break; 13046 default: 13047 quality = Bitmap.Config.ARGB_8888; 13048 break; 13049 } 13050 } else { 13051 // Optimization for translucent windows 13052 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 13053 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 13054 } 13055 13056 // Try to cleanup memory 13057 if (bitmap != null) bitmap.recycle(); 13058 13059 try { 13060 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13061 width, height, quality); 13062 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 13063 if (autoScale) { 13064 mDrawingCache = bitmap; 13065 } else { 13066 mUnscaledDrawingCache = bitmap; 13067 } 13068 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 13069 } catch (OutOfMemoryError e) { 13070 // If there is not enough memory to create the bitmap cache, just 13071 // ignore the issue as bitmap caches are not required to draw the 13072 // view hierarchy 13073 if (autoScale) { 13074 mDrawingCache = null; 13075 } else { 13076 mUnscaledDrawingCache = null; 13077 } 13078 mCachingFailed = true; 13079 return; 13080 } 13081 13082 clear = drawingCacheBackgroundColor != 0; 13083 } 13084 13085 Canvas canvas; 13086 if (attachInfo != null) { 13087 canvas = attachInfo.mCanvas; 13088 if (canvas == null) { 13089 canvas = new Canvas(); 13090 } 13091 canvas.setBitmap(bitmap); 13092 // Temporarily clobber the cached Canvas in case one of our children 13093 // is also using a drawing cache. Without this, the children would 13094 // steal the canvas by attaching their own bitmap to it and bad, bad 13095 // thing would happen (invisible views, corrupted drawings, etc.) 13096 attachInfo.mCanvas = null; 13097 } else { 13098 // This case should hopefully never or seldom happen 13099 canvas = new Canvas(bitmap); 13100 } 13101 13102 if (clear) { 13103 bitmap.eraseColor(drawingCacheBackgroundColor); 13104 } 13105 13106 computeScroll(); 13107 final int restoreCount = canvas.save(); 13108 13109 if (autoScale && scalingRequired) { 13110 final float scale = attachInfo.mApplicationScale; 13111 canvas.scale(scale, scale); 13112 } 13113 13114 canvas.translate(-mScrollX, -mScrollY); 13115 13116 mPrivateFlags |= PFLAG_DRAWN; 13117 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 13118 mLayerType != LAYER_TYPE_NONE) { 13119 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 13120 } 13121 13122 // Fast path for layouts with no backgrounds 13123 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13124 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13125 dispatchDraw(canvas); 13126 } else { 13127 draw(canvas); 13128 } 13129 13130 canvas.restoreToCount(restoreCount); 13131 canvas.setBitmap(null); 13132 13133 if (attachInfo != null) { 13134 // Restore the cached Canvas for our siblings 13135 attachInfo.mCanvas = canvas; 13136 } 13137 } 13138 } 13139 13140 /** 13141 * Create a snapshot of the view into a bitmap. We should probably make 13142 * some form of this public, but should think about the API. 13143 */ 13144 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 13145 int width = mRight - mLeft; 13146 int height = mBottom - mTop; 13147 13148 final AttachInfo attachInfo = mAttachInfo; 13149 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 13150 width = (int) ((width * scale) + 0.5f); 13151 height = (int) ((height * scale) + 0.5f); 13152 13153 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13154 width > 0 ? width : 1, height > 0 ? height : 1, quality); 13155 if (bitmap == null) { 13156 throw new OutOfMemoryError(); 13157 } 13158 13159 Resources resources = getResources(); 13160 if (resources != null) { 13161 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 13162 } 13163 13164 Canvas canvas; 13165 if (attachInfo != null) { 13166 canvas = attachInfo.mCanvas; 13167 if (canvas == null) { 13168 canvas = new Canvas(); 13169 } 13170 canvas.setBitmap(bitmap); 13171 // Temporarily clobber the cached Canvas in case one of our children 13172 // is also using a drawing cache. Without this, the children would 13173 // steal the canvas by attaching their own bitmap to it and bad, bad 13174 // things would happen (invisible views, corrupted drawings, etc.) 13175 attachInfo.mCanvas = null; 13176 } else { 13177 // This case should hopefully never or seldom happen 13178 canvas = new Canvas(bitmap); 13179 } 13180 13181 if ((backgroundColor & 0xff000000) != 0) { 13182 bitmap.eraseColor(backgroundColor); 13183 } 13184 13185 computeScroll(); 13186 final int restoreCount = canvas.save(); 13187 canvas.scale(scale, scale); 13188 canvas.translate(-mScrollX, -mScrollY); 13189 13190 // Temporarily remove the dirty mask 13191 int flags = mPrivateFlags; 13192 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13193 13194 // Fast path for layouts with no backgrounds 13195 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13196 dispatchDraw(canvas); 13197 } else { 13198 draw(canvas); 13199 } 13200 13201 mPrivateFlags = flags; 13202 13203 canvas.restoreToCount(restoreCount); 13204 canvas.setBitmap(null); 13205 13206 if (attachInfo != null) { 13207 // Restore the cached Canvas for our siblings 13208 attachInfo.mCanvas = canvas; 13209 } 13210 13211 return bitmap; 13212 } 13213 13214 /** 13215 * Indicates whether this View is currently in edit mode. A View is usually 13216 * in edit mode when displayed within a developer tool. For instance, if 13217 * this View is being drawn by a visual user interface builder, this method 13218 * should return true. 13219 * 13220 * Subclasses should check the return value of this method to provide 13221 * different behaviors if their normal behavior might interfere with the 13222 * host environment. For instance: the class spawns a thread in its 13223 * constructor, the drawing code relies on device-specific features, etc. 13224 * 13225 * This method is usually checked in the drawing code of custom widgets. 13226 * 13227 * @return True if this View is in edit mode, false otherwise. 13228 */ 13229 public boolean isInEditMode() { 13230 return false; 13231 } 13232 13233 /** 13234 * If the View draws content inside its padding and enables fading edges, 13235 * it needs to support padding offsets. Padding offsets are added to the 13236 * fading edges to extend the length of the fade so that it covers pixels 13237 * drawn inside the padding. 13238 * 13239 * Subclasses of this class should override this method if they need 13240 * to draw content inside the padding. 13241 * 13242 * @return True if padding offset must be applied, false otherwise. 13243 * 13244 * @see #getLeftPaddingOffset() 13245 * @see #getRightPaddingOffset() 13246 * @see #getTopPaddingOffset() 13247 * @see #getBottomPaddingOffset() 13248 * 13249 * @since CURRENT 13250 */ 13251 protected boolean isPaddingOffsetRequired() { 13252 return false; 13253 } 13254 13255 /** 13256 * Amount by which to extend the left fading region. Called only when 13257 * {@link #isPaddingOffsetRequired()} returns true. 13258 * 13259 * @return The left padding offset in pixels. 13260 * 13261 * @see #isPaddingOffsetRequired() 13262 * 13263 * @since CURRENT 13264 */ 13265 protected int getLeftPaddingOffset() { 13266 return 0; 13267 } 13268 13269 /** 13270 * Amount by which to extend the right fading region. Called only when 13271 * {@link #isPaddingOffsetRequired()} returns true. 13272 * 13273 * @return The right padding offset in pixels. 13274 * 13275 * @see #isPaddingOffsetRequired() 13276 * 13277 * @since CURRENT 13278 */ 13279 protected int getRightPaddingOffset() { 13280 return 0; 13281 } 13282 13283 /** 13284 * Amount by which to extend the top fading region. Called only when 13285 * {@link #isPaddingOffsetRequired()} returns true. 13286 * 13287 * @return The top padding offset in pixels. 13288 * 13289 * @see #isPaddingOffsetRequired() 13290 * 13291 * @since CURRENT 13292 */ 13293 protected int getTopPaddingOffset() { 13294 return 0; 13295 } 13296 13297 /** 13298 * Amount by which to extend the bottom fading region. Called only when 13299 * {@link #isPaddingOffsetRequired()} returns true. 13300 * 13301 * @return The bottom padding offset in pixels. 13302 * 13303 * @see #isPaddingOffsetRequired() 13304 * 13305 * @since CURRENT 13306 */ 13307 protected int getBottomPaddingOffset() { 13308 return 0; 13309 } 13310 13311 /** 13312 * @hide 13313 * @param offsetRequired 13314 */ 13315 protected int getFadeTop(boolean offsetRequired) { 13316 int top = mPaddingTop; 13317 if (offsetRequired) top += getTopPaddingOffset(); 13318 return top; 13319 } 13320 13321 /** 13322 * @hide 13323 * @param offsetRequired 13324 */ 13325 protected int getFadeHeight(boolean offsetRequired) { 13326 int padding = mPaddingTop; 13327 if (offsetRequired) padding += getTopPaddingOffset(); 13328 return mBottom - mTop - mPaddingBottom - padding; 13329 } 13330 13331 /** 13332 * <p>Indicates whether this view is attached to a hardware accelerated 13333 * window or not.</p> 13334 * 13335 * <p>Even if this method returns true, it does not mean that every call 13336 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13337 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13338 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13339 * window is hardware accelerated, 13340 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13341 * return false, and this method will return true.</p> 13342 * 13343 * @return True if the view is attached to a window and the window is 13344 * hardware accelerated; false in any other case. 13345 */ 13346 public boolean isHardwareAccelerated() { 13347 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13348 } 13349 13350 /** 13351 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13352 * case of an active Animation being run on the view. 13353 */ 13354 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13355 Animation a, boolean scalingRequired) { 13356 Transformation invalidationTransform; 13357 final int flags = parent.mGroupFlags; 13358 final boolean initialized = a.isInitialized(); 13359 if (!initialized) { 13360 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13361 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13362 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13363 onAnimationStart(); 13364 } 13365 13366 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 13367 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13368 if (parent.mInvalidationTransformation == null) { 13369 parent.mInvalidationTransformation = new Transformation(); 13370 } 13371 invalidationTransform = parent.mInvalidationTransformation; 13372 a.getTransformation(drawingTime, invalidationTransform, 1f); 13373 } else { 13374 invalidationTransform = parent.mChildTransformation; 13375 } 13376 13377 if (more) { 13378 if (!a.willChangeBounds()) { 13379 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13380 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13381 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13382 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13383 // The child need to draw an animation, potentially offscreen, so 13384 // make sure we do not cancel invalidate requests 13385 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13386 parent.invalidate(mLeft, mTop, mRight, mBottom); 13387 } 13388 } else { 13389 if (parent.mInvalidateRegion == null) { 13390 parent.mInvalidateRegion = new RectF(); 13391 } 13392 final RectF region = parent.mInvalidateRegion; 13393 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13394 invalidationTransform); 13395 13396 // The child need to draw an animation, potentially offscreen, so 13397 // make sure we do not cancel invalidate requests 13398 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13399 13400 final int left = mLeft + (int) region.left; 13401 final int top = mTop + (int) region.top; 13402 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13403 top + (int) (region.height() + .5f)); 13404 } 13405 } 13406 return more; 13407 } 13408 13409 /** 13410 * This method is called by getDisplayList() when a display list is created or re-rendered. 13411 * It sets or resets the current value of all properties on that display list (resetting is 13412 * necessary when a display list is being re-created, because we need to make sure that 13413 * previously-set transform values 13414 */ 13415 void setDisplayListProperties(DisplayList displayList) { 13416 if (displayList != null) { 13417 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13418 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13419 if (mParent instanceof ViewGroup) { 13420 displayList.setClipChildren( 13421 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 13422 } 13423 float alpha = 1; 13424 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 13425 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13426 ViewGroup parentVG = (ViewGroup) mParent; 13427 final boolean hasTransform = 13428 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 13429 if (hasTransform) { 13430 Transformation transform = parentVG.mChildTransformation; 13431 final int transformType = parentVG.mChildTransformation.getTransformationType(); 13432 if (transformType != Transformation.TYPE_IDENTITY) { 13433 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 13434 alpha = transform.getAlpha(); 13435 } 13436 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 13437 displayList.setMatrix(transform.getMatrix()); 13438 } 13439 } 13440 } 13441 } 13442 if (mTransformationInfo != null) { 13443 alpha *= mTransformationInfo.mAlpha; 13444 if (alpha < 1) { 13445 final int multipliedAlpha = (int) (255 * alpha); 13446 if (onSetAlpha(multipliedAlpha)) { 13447 alpha = 1; 13448 } 13449 } 13450 displayList.setTransformationInfo(alpha, 13451 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 13452 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 13453 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 13454 mTransformationInfo.mScaleY); 13455 if (mTransformationInfo.mCamera == null) { 13456 mTransformationInfo.mCamera = new Camera(); 13457 mTransformationInfo.matrix3D = new Matrix(); 13458 } 13459 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 13460 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 13461 displayList.setPivotX(getPivotX()); 13462 displayList.setPivotY(getPivotY()); 13463 } 13464 } else if (alpha < 1) { 13465 displayList.setAlpha(alpha); 13466 } 13467 } 13468 } 13469 13470 /** 13471 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 13472 * This draw() method is an implementation detail and is not intended to be overridden or 13473 * to be called from anywhere else other than ViewGroup.drawChild(). 13474 */ 13475 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 13476 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13477 boolean more = false; 13478 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 13479 final int flags = parent.mGroupFlags; 13480 13481 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 13482 parent.mChildTransformation.clear(); 13483 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13484 } 13485 13486 Transformation transformToApply = null; 13487 boolean concatMatrix = false; 13488 13489 boolean scalingRequired = false; 13490 boolean caching; 13491 int layerType = getLayerType(); 13492 13493 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 13494 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 13495 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 13496 caching = true; 13497 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 13498 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 13499 } else { 13500 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 13501 } 13502 13503 final Animation a = getAnimation(); 13504 if (a != null) { 13505 more = drawAnimation(parent, drawingTime, a, scalingRequired); 13506 concatMatrix = a.willChangeTransformationMatrix(); 13507 if (concatMatrix) { 13508 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13509 } 13510 transformToApply = parent.mChildTransformation; 13511 } else { 13512 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == 13513 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { 13514 // No longer animating: clear out old animation matrix 13515 mDisplayList.setAnimationMatrix(null); 13516 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13517 } 13518 if (!useDisplayListProperties && 13519 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13520 final boolean hasTransform = 13521 parent.getChildStaticTransformation(this, parent.mChildTransformation); 13522 if (hasTransform) { 13523 final int transformType = parent.mChildTransformation.getTransformationType(); 13524 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 13525 parent.mChildTransformation : null; 13526 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 13527 } 13528 } 13529 } 13530 13531 concatMatrix |= !childHasIdentityMatrix; 13532 13533 // Sets the flag as early as possible to allow draw() implementations 13534 // to call invalidate() successfully when doing animations 13535 mPrivateFlags |= PFLAG_DRAWN; 13536 13537 if (!concatMatrix && 13538 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 13539 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 13540 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 13541 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 13542 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 13543 return more; 13544 } 13545 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 13546 13547 if (hardwareAccelerated) { 13548 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 13549 // retain the flag's value temporarily in the mRecreateDisplayList flag 13550 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 13551 mPrivateFlags &= ~PFLAG_INVALIDATED; 13552 } 13553 13554 DisplayList displayList = null; 13555 Bitmap cache = null; 13556 boolean hasDisplayList = false; 13557 if (caching) { 13558 if (!hardwareAccelerated) { 13559 if (layerType != LAYER_TYPE_NONE) { 13560 layerType = LAYER_TYPE_SOFTWARE; 13561 buildDrawingCache(true); 13562 } 13563 cache = getDrawingCache(true); 13564 } else { 13565 switch (layerType) { 13566 case LAYER_TYPE_SOFTWARE: 13567 if (useDisplayListProperties) { 13568 hasDisplayList = canHaveDisplayList(); 13569 } else { 13570 buildDrawingCache(true); 13571 cache = getDrawingCache(true); 13572 } 13573 break; 13574 case LAYER_TYPE_HARDWARE: 13575 if (useDisplayListProperties) { 13576 hasDisplayList = canHaveDisplayList(); 13577 } 13578 break; 13579 case LAYER_TYPE_NONE: 13580 // Delay getting the display list until animation-driven alpha values are 13581 // set up and possibly passed on to the view 13582 hasDisplayList = canHaveDisplayList(); 13583 break; 13584 } 13585 } 13586 } 13587 useDisplayListProperties &= hasDisplayList; 13588 if (useDisplayListProperties) { 13589 displayList = getDisplayList(); 13590 if (!displayList.isValid()) { 13591 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13592 // to getDisplayList(), the display list will be marked invalid and we should not 13593 // try to use it again. 13594 displayList = null; 13595 hasDisplayList = false; 13596 useDisplayListProperties = false; 13597 } 13598 } 13599 13600 int sx = 0; 13601 int sy = 0; 13602 if (!hasDisplayList) { 13603 computeScroll(); 13604 sx = mScrollX; 13605 sy = mScrollY; 13606 } 13607 13608 final boolean hasNoCache = cache == null || hasDisplayList; 13609 final boolean offsetForScroll = cache == null && !hasDisplayList && 13610 layerType != LAYER_TYPE_HARDWARE; 13611 13612 int restoreTo = -1; 13613 if (!useDisplayListProperties || transformToApply != null) { 13614 restoreTo = canvas.save(); 13615 } 13616 if (offsetForScroll) { 13617 canvas.translate(mLeft - sx, mTop - sy); 13618 } else { 13619 if (!useDisplayListProperties) { 13620 canvas.translate(mLeft, mTop); 13621 } 13622 if (scalingRequired) { 13623 if (useDisplayListProperties) { 13624 // TODO: Might not need this if we put everything inside the DL 13625 restoreTo = canvas.save(); 13626 } 13627 // mAttachInfo cannot be null, otherwise scalingRequired == false 13628 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13629 canvas.scale(scale, scale); 13630 } 13631 } 13632 13633 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13634 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13635 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13636 if (transformToApply != null || !childHasIdentityMatrix) { 13637 int transX = 0; 13638 int transY = 0; 13639 13640 if (offsetForScroll) { 13641 transX = -sx; 13642 transY = -sy; 13643 } 13644 13645 if (transformToApply != null) { 13646 if (concatMatrix) { 13647 if (useDisplayListProperties) { 13648 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13649 } else { 13650 // Undo the scroll translation, apply the transformation matrix, 13651 // then redo the scroll translate to get the correct result. 13652 canvas.translate(-transX, -transY); 13653 canvas.concat(transformToApply.getMatrix()); 13654 canvas.translate(transX, transY); 13655 } 13656 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13657 } 13658 13659 float transformAlpha = transformToApply.getAlpha(); 13660 if (transformAlpha < 1) { 13661 alpha *= transformAlpha; 13662 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13663 } 13664 } 13665 13666 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13667 canvas.translate(-transX, -transY); 13668 canvas.concat(getMatrix()); 13669 canvas.translate(transX, transY); 13670 } 13671 } 13672 13673 // Deal with alpha if it is or used to be <1 13674 if (alpha < 1 || 13675 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13676 if (alpha < 1) { 13677 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13678 } else { 13679 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13680 } 13681 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13682 if (hasNoCache) { 13683 final int multipliedAlpha = (int) (255 * alpha); 13684 if (!onSetAlpha(multipliedAlpha)) { 13685 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13686 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13687 layerType != LAYER_TYPE_NONE) { 13688 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13689 } 13690 if (useDisplayListProperties) { 13691 displayList.setAlpha(alpha * getAlpha()); 13692 } else if (layerType == LAYER_TYPE_NONE) { 13693 final int scrollX = hasDisplayList ? 0 : sx; 13694 final int scrollY = hasDisplayList ? 0 : sy; 13695 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13696 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13697 } 13698 } else { 13699 // Alpha is handled by the child directly, clobber the layer's alpha 13700 mPrivateFlags |= PFLAG_ALPHA_SET; 13701 } 13702 } 13703 } 13704 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13705 onSetAlpha(255); 13706 mPrivateFlags &= ~PFLAG_ALPHA_SET; 13707 } 13708 13709 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13710 !useDisplayListProperties && layerType == LAYER_TYPE_NONE) { 13711 if (offsetForScroll) { 13712 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13713 } else { 13714 if (!scalingRequired || cache == null) { 13715 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13716 } else { 13717 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13718 } 13719 } 13720 } 13721 13722 if (!useDisplayListProperties && hasDisplayList) { 13723 displayList = getDisplayList(); 13724 if (!displayList.isValid()) { 13725 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13726 // to getDisplayList(), the display list will be marked invalid and we should not 13727 // try to use it again. 13728 displayList = null; 13729 hasDisplayList = false; 13730 } 13731 } 13732 13733 if (hasNoCache) { 13734 boolean layerRendered = false; 13735 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13736 final HardwareLayer layer = getHardwareLayer(); 13737 if (layer != null && layer.isValid()) { 13738 mLayerPaint.setAlpha((int) (alpha * 255)); 13739 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13740 layerRendered = true; 13741 } else { 13742 final int scrollX = hasDisplayList ? 0 : sx; 13743 final int scrollY = hasDisplayList ? 0 : sy; 13744 canvas.saveLayer(scrollX, scrollY, 13745 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13746 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13747 } 13748 } 13749 13750 if (!layerRendered) { 13751 if (!hasDisplayList) { 13752 // Fast path for layouts with no backgrounds 13753 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13754 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13755 dispatchDraw(canvas); 13756 } else { 13757 draw(canvas); 13758 } 13759 } else { 13760 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13761 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13762 } 13763 } 13764 } else if (cache != null) { 13765 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13766 Paint cachePaint; 13767 13768 if (layerType == LAYER_TYPE_NONE) { 13769 cachePaint = parent.mCachePaint; 13770 if (cachePaint == null) { 13771 cachePaint = new Paint(); 13772 cachePaint.setDither(false); 13773 parent.mCachePaint = cachePaint; 13774 } 13775 if (alpha < 1) { 13776 cachePaint.setAlpha((int) (alpha * 255)); 13777 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13778 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13779 cachePaint.setAlpha(255); 13780 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13781 } 13782 } else { 13783 cachePaint = mLayerPaint; 13784 cachePaint.setAlpha((int) (alpha * 255)); 13785 } 13786 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13787 } 13788 13789 if (restoreTo >= 0) { 13790 canvas.restoreToCount(restoreTo); 13791 } 13792 13793 if (a != null && !more) { 13794 if (!hardwareAccelerated && !a.getFillAfter()) { 13795 onSetAlpha(255); 13796 } 13797 parent.finishAnimatingView(this, a); 13798 } 13799 13800 if (more && hardwareAccelerated) { 13801 // invalidation is the trigger to recreate display lists, so if we're using 13802 // display lists to render, force an invalidate to allow the animation to 13803 // continue drawing another frame 13804 parent.invalidate(true); 13805 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13806 // alpha animations should cause the child to recreate its display list 13807 invalidate(true); 13808 } 13809 } 13810 13811 mRecreateDisplayList = false; 13812 13813 return more; 13814 } 13815 13816 /** 13817 * Manually render this view (and all of its children) to the given Canvas. 13818 * The view must have already done a full layout before this function is 13819 * called. When implementing a view, implement 13820 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13821 * If you do need to override this method, call the superclass version. 13822 * 13823 * @param canvas The Canvas to which the View is rendered. 13824 */ 13825 public void draw(Canvas canvas) { 13826 final int privateFlags = mPrivateFlags; 13827 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 13828 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13829 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 13830 13831 /* 13832 * Draw traversal performs several drawing steps which must be executed 13833 * in the appropriate order: 13834 * 13835 * 1. Draw the background 13836 * 2. If necessary, save the canvas' layers to prepare for fading 13837 * 3. Draw view's content 13838 * 4. Draw children 13839 * 5. If necessary, draw the fading edges and restore layers 13840 * 6. Draw decorations (scrollbars for instance) 13841 */ 13842 13843 // Step 1, draw the background, if needed 13844 int saveCount; 13845 13846 if (!dirtyOpaque) { 13847 final Drawable background = mBackground; 13848 if (background != null) { 13849 final int scrollX = mScrollX; 13850 final int scrollY = mScrollY; 13851 13852 if (mBackgroundSizeChanged) { 13853 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13854 mBackgroundSizeChanged = false; 13855 } 13856 13857 if ((scrollX | scrollY) == 0) { 13858 background.draw(canvas); 13859 } else { 13860 canvas.translate(scrollX, scrollY); 13861 background.draw(canvas); 13862 canvas.translate(-scrollX, -scrollY); 13863 } 13864 } 13865 } 13866 13867 // skip step 2 & 5 if possible (common case) 13868 final int viewFlags = mViewFlags; 13869 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13870 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13871 if (!verticalEdges && !horizontalEdges) { 13872 // Step 3, draw the content 13873 if (!dirtyOpaque) onDraw(canvas); 13874 13875 // Step 4, draw the children 13876 dispatchDraw(canvas); 13877 13878 // Step 6, draw decorations (scrollbars) 13879 onDrawScrollBars(canvas); 13880 13881 // we're done... 13882 return; 13883 } 13884 13885 /* 13886 * Here we do the full fledged routine... 13887 * (this is an uncommon case where speed matters less, 13888 * this is why we repeat some of the tests that have been 13889 * done above) 13890 */ 13891 13892 boolean drawTop = false; 13893 boolean drawBottom = false; 13894 boolean drawLeft = false; 13895 boolean drawRight = false; 13896 13897 float topFadeStrength = 0.0f; 13898 float bottomFadeStrength = 0.0f; 13899 float leftFadeStrength = 0.0f; 13900 float rightFadeStrength = 0.0f; 13901 13902 // Step 2, save the canvas' layers 13903 int paddingLeft = mPaddingLeft; 13904 13905 final boolean offsetRequired = isPaddingOffsetRequired(); 13906 if (offsetRequired) { 13907 paddingLeft += getLeftPaddingOffset(); 13908 } 13909 13910 int left = mScrollX + paddingLeft; 13911 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13912 int top = mScrollY + getFadeTop(offsetRequired); 13913 int bottom = top + getFadeHeight(offsetRequired); 13914 13915 if (offsetRequired) { 13916 right += getRightPaddingOffset(); 13917 bottom += getBottomPaddingOffset(); 13918 } 13919 13920 final ScrollabilityCache scrollabilityCache = mScrollCache; 13921 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13922 int length = (int) fadeHeight; 13923 13924 // clip the fade length if top and bottom fades overlap 13925 // overlapping fades produce odd-looking artifacts 13926 if (verticalEdges && (top + length > bottom - length)) { 13927 length = (bottom - top) / 2; 13928 } 13929 13930 // also clip horizontal fades if necessary 13931 if (horizontalEdges && (left + length > right - length)) { 13932 length = (right - left) / 2; 13933 } 13934 13935 if (verticalEdges) { 13936 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13937 drawTop = topFadeStrength * fadeHeight > 1.0f; 13938 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13939 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13940 } 13941 13942 if (horizontalEdges) { 13943 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13944 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13945 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13946 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13947 } 13948 13949 saveCount = canvas.getSaveCount(); 13950 13951 int solidColor = getSolidColor(); 13952 if (solidColor == 0) { 13953 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13954 13955 if (drawTop) { 13956 canvas.saveLayer(left, top, right, top + length, null, flags); 13957 } 13958 13959 if (drawBottom) { 13960 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13961 } 13962 13963 if (drawLeft) { 13964 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13965 } 13966 13967 if (drawRight) { 13968 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13969 } 13970 } else { 13971 scrollabilityCache.setFadeColor(solidColor); 13972 } 13973 13974 // Step 3, draw the content 13975 if (!dirtyOpaque) onDraw(canvas); 13976 13977 // Step 4, draw the children 13978 dispatchDraw(canvas); 13979 13980 // Step 5, draw the fade effect and restore layers 13981 final Paint p = scrollabilityCache.paint; 13982 final Matrix matrix = scrollabilityCache.matrix; 13983 final Shader fade = scrollabilityCache.shader; 13984 13985 if (drawTop) { 13986 matrix.setScale(1, fadeHeight * topFadeStrength); 13987 matrix.postTranslate(left, top); 13988 fade.setLocalMatrix(matrix); 13989 canvas.drawRect(left, top, right, top + length, p); 13990 } 13991 13992 if (drawBottom) { 13993 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13994 matrix.postRotate(180); 13995 matrix.postTranslate(left, bottom); 13996 fade.setLocalMatrix(matrix); 13997 canvas.drawRect(left, bottom - length, right, bottom, p); 13998 } 13999 14000 if (drawLeft) { 14001 matrix.setScale(1, fadeHeight * leftFadeStrength); 14002 matrix.postRotate(-90); 14003 matrix.postTranslate(left, top); 14004 fade.setLocalMatrix(matrix); 14005 canvas.drawRect(left, top, left + length, bottom, p); 14006 } 14007 14008 if (drawRight) { 14009 matrix.setScale(1, fadeHeight * rightFadeStrength); 14010 matrix.postRotate(90); 14011 matrix.postTranslate(right, top); 14012 fade.setLocalMatrix(matrix); 14013 canvas.drawRect(right - length, top, right, bottom, p); 14014 } 14015 14016 canvas.restoreToCount(saveCount); 14017 14018 // Step 6, draw decorations (scrollbars) 14019 onDrawScrollBars(canvas); 14020 } 14021 14022 /** 14023 * Override this if your view is known to always be drawn on top of a solid color background, 14024 * and needs to draw fading edges. Returning a non-zero color enables the view system to 14025 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 14026 * should be set to 0xFF. 14027 * 14028 * @see #setVerticalFadingEdgeEnabled(boolean) 14029 * @see #setHorizontalFadingEdgeEnabled(boolean) 14030 * 14031 * @return The known solid color background for this view, or 0 if the color may vary 14032 */ 14033 @ViewDebug.ExportedProperty(category = "drawing") 14034 public int getSolidColor() { 14035 return 0; 14036 } 14037 14038 /** 14039 * Build a human readable string representation of the specified view flags. 14040 * 14041 * @param flags the view flags to convert to a string 14042 * @return a String representing the supplied flags 14043 */ 14044 private static String printFlags(int flags) { 14045 String output = ""; 14046 int numFlags = 0; 14047 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 14048 output += "TAKES_FOCUS"; 14049 numFlags++; 14050 } 14051 14052 switch (flags & VISIBILITY_MASK) { 14053 case INVISIBLE: 14054 if (numFlags > 0) { 14055 output += " "; 14056 } 14057 output += "INVISIBLE"; 14058 // USELESS HERE numFlags++; 14059 break; 14060 case GONE: 14061 if (numFlags > 0) { 14062 output += " "; 14063 } 14064 output += "GONE"; 14065 // USELESS HERE numFlags++; 14066 break; 14067 default: 14068 break; 14069 } 14070 return output; 14071 } 14072 14073 /** 14074 * Build a human readable string representation of the specified private 14075 * view flags. 14076 * 14077 * @param privateFlags the private view flags to convert to a string 14078 * @return a String representing the supplied flags 14079 */ 14080 private static String printPrivateFlags(int privateFlags) { 14081 String output = ""; 14082 int numFlags = 0; 14083 14084 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 14085 output += "WANTS_FOCUS"; 14086 numFlags++; 14087 } 14088 14089 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 14090 if (numFlags > 0) { 14091 output += " "; 14092 } 14093 output += "FOCUSED"; 14094 numFlags++; 14095 } 14096 14097 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 14098 if (numFlags > 0) { 14099 output += " "; 14100 } 14101 output += "SELECTED"; 14102 numFlags++; 14103 } 14104 14105 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 14106 if (numFlags > 0) { 14107 output += " "; 14108 } 14109 output += "IS_ROOT_NAMESPACE"; 14110 numFlags++; 14111 } 14112 14113 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 14114 if (numFlags > 0) { 14115 output += " "; 14116 } 14117 output += "HAS_BOUNDS"; 14118 numFlags++; 14119 } 14120 14121 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 14122 if (numFlags > 0) { 14123 output += " "; 14124 } 14125 output += "DRAWN"; 14126 // USELESS HERE numFlags++; 14127 } 14128 return output; 14129 } 14130 14131 /** 14132 * <p>Indicates whether or not this view's layout will be requested during 14133 * the next hierarchy layout pass.</p> 14134 * 14135 * @return true if the layout will be forced during next layout pass 14136 */ 14137 public boolean isLayoutRequested() { 14138 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 14139 } 14140 14141 /** 14142 * Return true if o is a ViewGroup that is laying out using optical bounds. 14143 * @hide 14144 */ 14145 public static boolean isLayoutModeOptical(Object o) { 14146 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 14147 } 14148 14149 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 14150 Insets parentInsets = mParent instanceof View ? 14151 ((View) mParent).getOpticalInsets() : Insets.NONE; 14152 Insets childInsets = getOpticalInsets(); 14153 return setFrame( 14154 left + parentInsets.left - childInsets.left, 14155 top + parentInsets.top - childInsets.top, 14156 right + parentInsets.left + childInsets.right, 14157 bottom + parentInsets.top + childInsets.bottom); 14158 } 14159 14160 /** 14161 * Assign a size and position to a view and all of its 14162 * descendants 14163 * 14164 * <p>This is the second phase of the layout mechanism. 14165 * (The first is measuring). In this phase, each parent calls 14166 * layout on all of its children to position them. 14167 * This is typically done using the child measurements 14168 * that were stored in the measure pass().</p> 14169 * 14170 * <p>Derived classes should not override this method. 14171 * Derived classes with children should override 14172 * onLayout. In that method, they should 14173 * call layout on each of their children.</p> 14174 * 14175 * @param l Left position, relative to parent 14176 * @param t Top position, relative to parent 14177 * @param r Right position, relative to parent 14178 * @param b Bottom position, relative to parent 14179 */ 14180 @SuppressWarnings({"unchecked"}) 14181 public void layout(int l, int t, int r, int b) { 14182 int oldL = mLeft; 14183 int oldT = mTop; 14184 int oldB = mBottom; 14185 int oldR = mRight; 14186 boolean changed = isLayoutModeOptical(mParent) ? 14187 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14188 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14189 onLayout(changed, l, t, r, b); 14190 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14191 14192 ListenerInfo li = mListenerInfo; 14193 if (li != null && li.mOnLayoutChangeListeners != null) { 14194 ArrayList<OnLayoutChangeListener> listenersCopy = 14195 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14196 int numListeners = listenersCopy.size(); 14197 for (int i = 0; i < numListeners; ++i) { 14198 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14199 } 14200 } 14201 } 14202 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14203 } 14204 14205 /** 14206 * Called from layout when this view should 14207 * assign a size and position to each of its children. 14208 * 14209 * Derived classes with children should override 14210 * this method and call layout on each of 14211 * their children. 14212 * @param changed This is a new size or position for this view 14213 * @param left Left position, relative to parent 14214 * @param top Top position, relative to parent 14215 * @param right Right position, relative to parent 14216 * @param bottom Bottom position, relative to parent 14217 */ 14218 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14219 } 14220 14221 /** 14222 * Assign a size and position to this view. 14223 * 14224 * This is called from layout. 14225 * 14226 * @param left Left position, relative to parent 14227 * @param top Top position, relative to parent 14228 * @param right Right position, relative to parent 14229 * @param bottom Bottom position, relative to parent 14230 * @return true if the new size and position are different than the 14231 * previous ones 14232 * {@hide} 14233 */ 14234 protected boolean setFrame(int left, int top, int right, int bottom) { 14235 boolean changed = false; 14236 14237 if (DBG) { 14238 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14239 + right + "," + bottom + ")"); 14240 } 14241 14242 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14243 changed = true; 14244 14245 // Remember our drawn bit 14246 int drawn = mPrivateFlags & PFLAG_DRAWN; 14247 14248 int oldWidth = mRight - mLeft; 14249 int oldHeight = mBottom - mTop; 14250 int newWidth = right - left; 14251 int newHeight = bottom - top; 14252 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14253 14254 // Invalidate our old position 14255 invalidate(sizeChanged); 14256 14257 mLeft = left; 14258 mTop = top; 14259 mRight = right; 14260 mBottom = bottom; 14261 if (mDisplayList != null) { 14262 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14263 } 14264 14265 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14266 14267 14268 if (sizeChanged) { 14269 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14270 // A change in dimension means an auto-centered pivot point changes, too 14271 if (mTransformationInfo != null) { 14272 mTransformationInfo.mMatrixDirty = true; 14273 } 14274 } 14275 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14276 } 14277 14278 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14279 // If we are visible, force the DRAWN bit to on so that 14280 // this invalidate will go through (at least to our parent). 14281 // This is because someone may have invalidated this view 14282 // before this call to setFrame came in, thereby clearing 14283 // the DRAWN bit. 14284 mPrivateFlags |= PFLAG_DRAWN; 14285 invalidate(sizeChanged); 14286 // parent display list may need to be recreated based on a change in the bounds 14287 // of any child 14288 invalidateParentCaches(); 14289 } 14290 14291 // Reset drawn bit to original value (invalidate turns it off) 14292 mPrivateFlags |= drawn; 14293 14294 mBackgroundSizeChanged = true; 14295 } 14296 return changed; 14297 } 14298 14299 /** 14300 * Finalize inflating a view from XML. This is called as the last phase 14301 * of inflation, after all child views have been added. 14302 * 14303 * <p>Even if the subclass overrides onFinishInflate, they should always be 14304 * sure to call the super method, so that we get called. 14305 */ 14306 protected void onFinishInflate() { 14307 } 14308 14309 /** 14310 * Returns the resources associated with this view. 14311 * 14312 * @return Resources object. 14313 */ 14314 public Resources getResources() { 14315 return mResources; 14316 } 14317 14318 /** 14319 * Invalidates the specified Drawable. 14320 * 14321 * @param drawable the drawable to invalidate 14322 */ 14323 public void invalidateDrawable(Drawable drawable) { 14324 if (verifyDrawable(drawable)) { 14325 final Rect dirty = drawable.getBounds(); 14326 final int scrollX = mScrollX; 14327 final int scrollY = mScrollY; 14328 14329 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14330 dirty.right + scrollX, dirty.bottom + scrollY); 14331 } 14332 } 14333 14334 /** 14335 * Schedules an action on a drawable to occur at a specified time. 14336 * 14337 * @param who the recipient of the action 14338 * @param what the action to run on the drawable 14339 * @param when the time at which the action must occur. Uses the 14340 * {@link SystemClock#uptimeMillis} timebase. 14341 */ 14342 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14343 if (verifyDrawable(who) && what != null) { 14344 final long delay = when - SystemClock.uptimeMillis(); 14345 if (mAttachInfo != null) { 14346 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14347 Choreographer.CALLBACK_ANIMATION, what, who, 14348 Choreographer.subtractFrameDelay(delay)); 14349 } else { 14350 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14351 } 14352 } 14353 } 14354 14355 /** 14356 * Cancels a scheduled action on a drawable. 14357 * 14358 * @param who the recipient of the action 14359 * @param what the action to cancel 14360 */ 14361 public void unscheduleDrawable(Drawable who, Runnable what) { 14362 if (verifyDrawable(who) && what != null) { 14363 if (mAttachInfo != null) { 14364 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14365 Choreographer.CALLBACK_ANIMATION, what, who); 14366 } else { 14367 ViewRootImpl.getRunQueue().removeCallbacks(what); 14368 } 14369 } 14370 } 14371 14372 /** 14373 * Unschedule any events associated with the given Drawable. This can be 14374 * used when selecting a new Drawable into a view, so that the previous 14375 * one is completely unscheduled. 14376 * 14377 * @param who The Drawable to unschedule. 14378 * 14379 * @see #drawableStateChanged 14380 */ 14381 public void unscheduleDrawable(Drawable who) { 14382 if (mAttachInfo != null && who != null) { 14383 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14384 Choreographer.CALLBACK_ANIMATION, null, who); 14385 } 14386 } 14387 14388 /** 14389 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 14390 * that the View directionality can and will be resolved before its Drawables. 14391 * 14392 * Will call {@link View#onResolveDrawables} when resolution is done. 14393 * 14394 * @hide 14395 */ 14396 protected void resolveDrawables() { 14397 if (canResolveLayoutDirection()) { 14398 if (mBackground != null) { 14399 mBackground.setLayoutDirection(getLayoutDirection()); 14400 } 14401 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 14402 onResolveDrawables(getLayoutDirection()); 14403 } 14404 } 14405 14406 /** 14407 * Called when layout direction has been resolved. 14408 * 14409 * The default implementation does nothing. 14410 * 14411 * @param layoutDirection The resolved layout direction. 14412 * 14413 * @see #LAYOUT_DIRECTION_LTR 14414 * @see #LAYOUT_DIRECTION_RTL 14415 * 14416 * @hide 14417 */ 14418 public void onResolveDrawables(int layoutDirection) { 14419 } 14420 14421 /** 14422 * @hide 14423 */ 14424 protected void resetResolvedDrawables() { 14425 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 14426 } 14427 14428 private boolean isDrawablesResolved() { 14429 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 14430 } 14431 14432 /** 14433 * If your view subclass is displaying its own Drawable objects, it should 14434 * override this function and return true for any Drawable it is 14435 * displaying. This allows animations for those drawables to be 14436 * scheduled. 14437 * 14438 * <p>Be sure to call through to the super class when overriding this 14439 * function. 14440 * 14441 * @param who The Drawable to verify. Return true if it is one you are 14442 * displaying, else return the result of calling through to the 14443 * super class. 14444 * 14445 * @return boolean If true than the Drawable is being displayed in the 14446 * view; else false and it is not allowed to animate. 14447 * 14448 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 14449 * @see #drawableStateChanged() 14450 */ 14451 protected boolean verifyDrawable(Drawable who) { 14452 return who == mBackground; 14453 } 14454 14455 /** 14456 * This function is called whenever the state of the view changes in such 14457 * a way that it impacts the state of drawables being shown. 14458 * 14459 * <p>Be sure to call through to the superclass when overriding this 14460 * function. 14461 * 14462 * @see Drawable#setState(int[]) 14463 */ 14464 protected void drawableStateChanged() { 14465 Drawable d = mBackground; 14466 if (d != null && d.isStateful()) { 14467 d.setState(getDrawableState()); 14468 } 14469 } 14470 14471 /** 14472 * Call this to force a view to update its drawable state. This will cause 14473 * drawableStateChanged to be called on this view. Views that are interested 14474 * in the new state should call getDrawableState. 14475 * 14476 * @see #drawableStateChanged 14477 * @see #getDrawableState 14478 */ 14479 public void refreshDrawableState() { 14480 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 14481 drawableStateChanged(); 14482 14483 ViewParent parent = mParent; 14484 if (parent != null) { 14485 parent.childDrawableStateChanged(this); 14486 } 14487 } 14488 14489 /** 14490 * Return an array of resource IDs of the drawable states representing the 14491 * current state of the view. 14492 * 14493 * @return The current drawable state 14494 * 14495 * @see Drawable#setState(int[]) 14496 * @see #drawableStateChanged() 14497 * @see #onCreateDrawableState(int) 14498 */ 14499 public final int[] getDrawableState() { 14500 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 14501 return mDrawableState; 14502 } else { 14503 mDrawableState = onCreateDrawableState(0); 14504 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 14505 return mDrawableState; 14506 } 14507 } 14508 14509 /** 14510 * Generate the new {@link android.graphics.drawable.Drawable} state for 14511 * this view. This is called by the view 14512 * system when the cached Drawable state is determined to be invalid. To 14513 * retrieve the current state, you should use {@link #getDrawableState}. 14514 * 14515 * @param extraSpace if non-zero, this is the number of extra entries you 14516 * would like in the returned array in which you can place your own 14517 * states. 14518 * 14519 * @return Returns an array holding the current {@link Drawable} state of 14520 * the view. 14521 * 14522 * @see #mergeDrawableStates(int[], int[]) 14523 */ 14524 protected int[] onCreateDrawableState(int extraSpace) { 14525 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 14526 mParent instanceof View) { 14527 return ((View) mParent).onCreateDrawableState(extraSpace); 14528 } 14529 14530 int[] drawableState; 14531 14532 int privateFlags = mPrivateFlags; 14533 14534 int viewStateIndex = 0; 14535 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 14536 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 14537 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 14538 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 14539 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 14540 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 14541 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 14542 HardwareRenderer.isAvailable()) { 14543 // This is set if HW acceleration is requested, even if the current 14544 // process doesn't allow it. This is just to allow app preview 14545 // windows to better match their app. 14546 viewStateIndex |= VIEW_STATE_ACCELERATED; 14547 } 14548 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 14549 14550 final int privateFlags2 = mPrivateFlags2; 14551 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 14552 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 14553 14554 drawableState = VIEW_STATE_SETS[viewStateIndex]; 14555 14556 //noinspection ConstantIfStatement 14557 if (false) { 14558 Log.i("View", "drawableStateIndex=" + viewStateIndex); 14559 Log.i("View", toString() 14560 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 14561 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 14562 + " fo=" + hasFocus() 14563 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 14564 + " wf=" + hasWindowFocus() 14565 + ": " + Arrays.toString(drawableState)); 14566 } 14567 14568 if (extraSpace == 0) { 14569 return drawableState; 14570 } 14571 14572 final int[] fullState; 14573 if (drawableState != null) { 14574 fullState = new int[drawableState.length + extraSpace]; 14575 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 14576 } else { 14577 fullState = new int[extraSpace]; 14578 } 14579 14580 return fullState; 14581 } 14582 14583 /** 14584 * Merge your own state values in <var>additionalState</var> into the base 14585 * state values <var>baseState</var> that were returned by 14586 * {@link #onCreateDrawableState(int)}. 14587 * 14588 * @param baseState The base state values returned by 14589 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 14590 * own additional state values. 14591 * 14592 * @param additionalState The additional state values you would like 14593 * added to <var>baseState</var>; this array is not modified. 14594 * 14595 * @return As a convenience, the <var>baseState</var> array you originally 14596 * passed into the function is returned. 14597 * 14598 * @see #onCreateDrawableState(int) 14599 */ 14600 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 14601 final int N = baseState.length; 14602 int i = N - 1; 14603 while (i >= 0 && baseState[i] == 0) { 14604 i--; 14605 } 14606 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 14607 return baseState; 14608 } 14609 14610 /** 14611 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 14612 * on all Drawable objects associated with this view. 14613 */ 14614 public void jumpDrawablesToCurrentState() { 14615 if (mBackground != null) { 14616 mBackground.jumpToCurrentState(); 14617 } 14618 } 14619 14620 /** 14621 * Sets the background color for this view. 14622 * @param color the color of the background 14623 */ 14624 @RemotableViewMethod 14625 public void setBackgroundColor(int color) { 14626 if (mBackground instanceof ColorDrawable) { 14627 ((ColorDrawable) mBackground.mutate()).setColor(color); 14628 computeOpaqueFlags(); 14629 mBackgroundResource = 0; 14630 } else { 14631 setBackground(new ColorDrawable(color)); 14632 } 14633 } 14634 14635 /** 14636 * Set the background to a given resource. The resource should refer to 14637 * a Drawable object or 0 to remove the background. 14638 * @param resid The identifier of the resource. 14639 * 14640 * @attr ref android.R.styleable#View_background 14641 */ 14642 @RemotableViewMethod 14643 public void setBackgroundResource(int resid) { 14644 if (resid != 0 && resid == mBackgroundResource) { 14645 return; 14646 } 14647 14648 Drawable d= null; 14649 if (resid != 0) { 14650 d = mResources.getDrawable(resid); 14651 } 14652 setBackground(d); 14653 14654 mBackgroundResource = resid; 14655 } 14656 14657 /** 14658 * Set the background to a given Drawable, or remove the background. If the 14659 * background has padding, this View's padding is set to the background's 14660 * padding. However, when a background is removed, this View's padding isn't 14661 * touched. If setting the padding is desired, please use 14662 * {@link #setPadding(int, int, int, int)}. 14663 * 14664 * @param background The Drawable to use as the background, or null to remove the 14665 * background 14666 */ 14667 public void setBackground(Drawable background) { 14668 //noinspection deprecation 14669 setBackgroundDrawable(background); 14670 } 14671 14672 /** 14673 * @deprecated use {@link #setBackground(Drawable)} instead 14674 */ 14675 @Deprecated 14676 public void setBackgroundDrawable(Drawable background) { 14677 computeOpaqueFlags(); 14678 14679 if (background == mBackground) { 14680 return; 14681 } 14682 14683 boolean requestLayout = false; 14684 14685 mBackgroundResource = 0; 14686 14687 /* 14688 * Regardless of whether we're setting a new background or not, we want 14689 * to clear the previous drawable. 14690 */ 14691 if (mBackground != null) { 14692 mBackground.setCallback(null); 14693 unscheduleDrawable(mBackground); 14694 } 14695 14696 if (background != null) { 14697 Rect padding = sThreadLocal.get(); 14698 if (padding == null) { 14699 padding = new Rect(); 14700 sThreadLocal.set(padding); 14701 } 14702 resetResolvedDrawables(); 14703 background.setLayoutDirection(getLayoutDirection()); 14704 if (background.getPadding(padding)) { 14705 resetResolvedPadding(); 14706 switch (background.getLayoutDirection()) { 14707 case LAYOUT_DIRECTION_RTL: 14708 mUserPaddingLeftInitial = padding.right; 14709 mUserPaddingRightInitial = padding.left; 14710 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 14711 break; 14712 case LAYOUT_DIRECTION_LTR: 14713 default: 14714 mUserPaddingLeftInitial = padding.left; 14715 mUserPaddingRightInitial = padding.right; 14716 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 14717 } 14718 } 14719 14720 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14721 // if it has a different minimum size, we should layout again 14722 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14723 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14724 requestLayout = true; 14725 } 14726 14727 background.setCallback(this); 14728 if (background.isStateful()) { 14729 background.setState(getDrawableState()); 14730 } 14731 background.setVisible(getVisibility() == VISIBLE, false); 14732 mBackground = background; 14733 14734 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 14735 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 14736 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 14737 requestLayout = true; 14738 } 14739 } else { 14740 /* Remove the background */ 14741 mBackground = null; 14742 14743 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 14744 /* 14745 * This view ONLY drew the background before and we're removing 14746 * the background, so now it won't draw anything 14747 * (hence we SKIP_DRAW) 14748 */ 14749 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 14750 mPrivateFlags |= PFLAG_SKIP_DRAW; 14751 } 14752 14753 /* 14754 * When the background is set, we try to apply its padding to this 14755 * View. When the background is removed, we don't touch this View's 14756 * padding. This is noted in the Javadocs. Hence, we don't need to 14757 * requestLayout(), the invalidate() below is sufficient. 14758 */ 14759 14760 // The old background's minimum size could have affected this 14761 // View's layout, so let's requestLayout 14762 requestLayout = true; 14763 } 14764 14765 computeOpaqueFlags(); 14766 14767 if (requestLayout) { 14768 requestLayout(); 14769 } 14770 14771 mBackgroundSizeChanged = true; 14772 invalidate(true); 14773 } 14774 14775 /** 14776 * Gets the background drawable 14777 * 14778 * @return The drawable used as the background for this view, if any. 14779 * 14780 * @see #setBackground(Drawable) 14781 * 14782 * @attr ref android.R.styleable#View_background 14783 */ 14784 public Drawable getBackground() { 14785 return mBackground; 14786 } 14787 14788 /** 14789 * Sets the padding. The view may add on the space required to display 14790 * the scrollbars, depending on the style and visibility of the scrollbars. 14791 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14792 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14793 * from the values set in this call. 14794 * 14795 * @attr ref android.R.styleable#View_padding 14796 * @attr ref android.R.styleable#View_paddingBottom 14797 * @attr ref android.R.styleable#View_paddingLeft 14798 * @attr ref android.R.styleable#View_paddingRight 14799 * @attr ref android.R.styleable#View_paddingTop 14800 * @param left the left padding in pixels 14801 * @param top the top padding in pixels 14802 * @param right the right padding in pixels 14803 * @param bottom the bottom padding in pixels 14804 */ 14805 public void setPadding(int left, int top, int right, int bottom) { 14806 resetResolvedPadding(); 14807 14808 mUserPaddingStart = UNDEFINED_PADDING; 14809 mUserPaddingEnd = UNDEFINED_PADDING; 14810 14811 mUserPaddingLeftInitial = left; 14812 mUserPaddingRightInitial = right; 14813 14814 internalSetPadding(left, top, right, bottom); 14815 } 14816 14817 /** 14818 * @hide 14819 */ 14820 protected void internalSetPadding(int left, int top, int right, int bottom) { 14821 mUserPaddingLeft = left; 14822 mUserPaddingRight = right; 14823 mUserPaddingBottom = bottom; 14824 14825 final int viewFlags = mViewFlags; 14826 boolean changed = false; 14827 14828 // Common case is there are no scroll bars. 14829 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14830 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14831 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14832 ? 0 : getVerticalScrollbarWidth(); 14833 switch (mVerticalScrollbarPosition) { 14834 case SCROLLBAR_POSITION_DEFAULT: 14835 if (isLayoutRtl()) { 14836 left += offset; 14837 } else { 14838 right += offset; 14839 } 14840 break; 14841 case SCROLLBAR_POSITION_RIGHT: 14842 right += offset; 14843 break; 14844 case SCROLLBAR_POSITION_LEFT: 14845 left += offset; 14846 break; 14847 } 14848 } 14849 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14850 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14851 ? 0 : getHorizontalScrollbarHeight(); 14852 } 14853 } 14854 14855 if (mPaddingLeft != left) { 14856 changed = true; 14857 mPaddingLeft = left; 14858 } 14859 if (mPaddingTop != top) { 14860 changed = true; 14861 mPaddingTop = top; 14862 } 14863 if (mPaddingRight != right) { 14864 changed = true; 14865 mPaddingRight = right; 14866 } 14867 if (mPaddingBottom != bottom) { 14868 changed = true; 14869 mPaddingBottom = bottom; 14870 } 14871 14872 if (changed) { 14873 requestLayout(); 14874 } 14875 } 14876 14877 /** 14878 * Sets the relative padding. The view may add on the space required to display 14879 * the scrollbars, depending on the style and visibility of the scrollbars. 14880 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14881 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14882 * from the values set in this call. 14883 * 14884 * @attr ref android.R.styleable#View_padding 14885 * @attr ref android.R.styleable#View_paddingBottom 14886 * @attr ref android.R.styleable#View_paddingStart 14887 * @attr ref android.R.styleable#View_paddingEnd 14888 * @attr ref android.R.styleable#View_paddingTop 14889 * @param start the start padding in pixels 14890 * @param top the top padding in pixels 14891 * @param end the end padding in pixels 14892 * @param bottom the bottom padding in pixels 14893 */ 14894 public void setPaddingRelative(int start, int top, int end, int bottom) { 14895 resetResolvedPadding(); 14896 14897 mUserPaddingStart = start; 14898 mUserPaddingEnd = end; 14899 14900 switch(getLayoutDirection()) { 14901 case LAYOUT_DIRECTION_RTL: 14902 mUserPaddingLeftInitial = end; 14903 mUserPaddingRightInitial = start; 14904 internalSetPadding(end, top, start, bottom); 14905 break; 14906 case LAYOUT_DIRECTION_LTR: 14907 default: 14908 mUserPaddingLeftInitial = start; 14909 mUserPaddingRightInitial = end; 14910 internalSetPadding(start, top, end, bottom); 14911 } 14912 } 14913 14914 /** 14915 * Returns the top padding of this view. 14916 * 14917 * @return the top padding in pixels 14918 */ 14919 public int getPaddingTop() { 14920 return mPaddingTop; 14921 } 14922 14923 /** 14924 * Returns the bottom padding of this view. If there are inset and enabled 14925 * scrollbars, this value may include the space required to display the 14926 * scrollbars as well. 14927 * 14928 * @return the bottom padding in pixels 14929 */ 14930 public int getPaddingBottom() { 14931 return mPaddingBottom; 14932 } 14933 14934 /** 14935 * Returns the left padding of this view. If there are inset and enabled 14936 * scrollbars, this value may include the space required to display the 14937 * scrollbars as well. 14938 * 14939 * @return the left padding in pixels 14940 */ 14941 public int getPaddingLeft() { 14942 if (!isPaddingResolved()) { 14943 resolvePadding(); 14944 } 14945 return mPaddingLeft; 14946 } 14947 14948 /** 14949 * Returns the start padding of this view depending on its resolved layout direction. 14950 * If there are inset and enabled scrollbars, this value may include the space 14951 * required to display the scrollbars as well. 14952 * 14953 * @return the start padding in pixels 14954 */ 14955 public int getPaddingStart() { 14956 if (!isPaddingResolved()) { 14957 resolvePadding(); 14958 } 14959 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14960 mPaddingRight : mPaddingLeft; 14961 } 14962 14963 /** 14964 * Returns the right padding of this view. If there are inset and enabled 14965 * scrollbars, this value may include the space required to display the 14966 * scrollbars as well. 14967 * 14968 * @return the right padding in pixels 14969 */ 14970 public int getPaddingRight() { 14971 if (!isPaddingResolved()) { 14972 resolvePadding(); 14973 } 14974 return mPaddingRight; 14975 } 14976 14977 /** 14978 * Returns the end padding of this view depending on its resolved layout direction. 14979 * If there are inset and enabled scrollbars, this value may include the space 14980 * required to display the scrollbars as well. 14981 * 14982 * @return the end padding in pixels 14983 */ 14984 public int getPaddingEnd() { 14985 if (!isPaddingResolved()) { 14986 resolvePadding(); 14987 } 14988 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14989 mPaddingLeft : mPaddingRight; 14990 } 14991 14992 /** 14993 * Return if the padding as been set thru relative values 14994 * {@link #setPaddingRelative(int, int, int, int)} or thru 14995 * @attr ref android.R.styleable#View_paddingStart or 14996 * @attr ref android.R.styleable#View_paddingEnd 14997 * 14998 * @return true if the padding is relative or false if it is not. 14999 */ 15000 public boolean isPaddingRelative() { 15001 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 15002 } 15003 15004 Insets computeOpticalInsets() { 15005 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 15006 } 15007 15008 /** 15009 * @hide 15010 */ 15011 public void resetPaddingToInitialValues() { 15012 if (isRtlCompatibilityMode()) { 15013 mPaddingLeft = mUserPaddingLeftInitial; 15014 mPaddingRight = mUserPaddingRightInitial; 15015 return; 15016 } 15017 if (isLayoutRtl()) { 15018 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 15019 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 15020 } else { 15021 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 15022 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 15023 } 15024 } 15025 15026 /** 15027 * @hide 15028 */ 15029 public Insets getOpticalInsets() { 15030 if (mLayoutInsets == null) { 15031 mLayoutInsets = computeOpticalInsets(); 15032 } 15033 return mLayoutInsets; 15034 } 15035 15036 /** 15037 * Changes the selection state of this view. A view can be selected or not. 15038 * Note that selection is not the same as focus. Views are typically 15039 * selected in the context of an AdapterView like ListView or GridView; 15040 * the selected view is the view that is highlighted. 15041 * 15042 * @param selected true if the view must be selected, false otherwise 15043 */ 15044 public void setSelected(boolean selected) { 15045 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 15046 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 15047 if (!selected) resetPressedState(); 15048 invalidate(true); 15049 refreshDrawableState(); 15050 dispatchSetSelected(selected); 15051 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 15052 notifyAccessibilityStateChanged(); 15053 } 15054 } 15055 } 15056 15057 /** 15058 * Dispatch setSelected to all of this View's children. 15059 * 15060 * @see #setSelected(boolean) 15061 * 15062 * @param selected The new selected state 15063 */ 15064 protected void dispatchSetSelected(boolean selected) { 15065 } 15066 15067 /** 15068 * Indicates the selection state of this view. 15069 * 15070 * @return true if the view is selected, false otherwise 15071 */ 15072 @ViewDebug.ExportedProperty 15073 public boolean isSelected() { 15074 return (mPrivateFlags & PFLAG_SELECTED) != 0; 15075 } 15076 15077 /** 15078 * Changes the activated state of this view. A view can be activated or not. 15079 * Note that activation is not the same as selection. Selection is 15080 * a transient property, representing the view (hierarchy) the user is 15081 * currently interacting with. Activation is a longer-term state that the 15082 * user can move views in and out of. For example, in a list view with 15083 * single or multiple selection enabled, the views in the current selection 15084 * set are activated. (Um, yeah, we are deeply sorry about the terminology 15085 * here.) The activated state is propagated down to children of the view it 15086 * is set on. 15087 * 15088 * @param activated true if the view must be activated, false otherwise 15089 */ 15090 public void setActivated(boolean activated) { 15091 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 15092 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 15093 invalidate(true); 15094 refreshDrawableState(); 15095 dispatchSetActivated(activated); 15096 } 15097 } 15098 15099 /** 15100 * Dispatch setActivated to all of this View's children. 15101 * 15102 * @see #setActivated(boolean) 15103 * 15104 * @param activated The new activated state 15105 */ 15106 protected void dispatchSetActivated(boolean activated) { 15107 } 15108 15109 /** 15110 * Indicates the activation state of this view. 15111 * 15112 * @return true if the view is activated, false otherwise 15113 */ 15114 @ViewDebug.ExportedProperty 15115 public boolean isActivated() { 15116 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 15117 } 15118 15119 /** 15120 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 15121 * observer can be used to get notifications when global events, like 15122 * layout, happen. 15123 * 15124 * The returned ViewTreeObserver observer is not guaranteed to remain 15125 * valid for the lifetime of this View. If the caller of this method keeps 15126 * a long-lived reference to ViewTreeObserver, it should always check for 15127 * the return value of {@link ViewTreeObserver#isAlive()}. 15128 * 15129 * @return The ViewTreeObserver for this view's hierarchy. 15130 */ 15131 public ViewTreeObserver getViewTreeObserver() { 15132 if (mAttachInfo != null) { 15133 return mAttachInfo.mTreeObserver; 15134 } 15135 if (mFloatingTreeObserver == null) { 15136 mFloatingTreeObserver = new ViewTreeObserver(); 15137 } 15138 return mFloatingTreeObserver; 15139 } 15140 15141 /** 15142 * <p>Finds the topmost view in the current view hierarchy.</p> 15143 * 15144 * @return the topmost view containing this view 15145 */ 15146 public View getRootView() { 15147 if (mAttachInfo != null) { 15148 final View v = mAttachInfo.mRootView; 15149 if (v != null) { 15150 return v; 15151 } 15152 } 15153 15154 View parent = this; 15155 15156 while (parent.mParent != null && parent.mParent instanceof View) { 15157 parent = (View) parent.mParent; 15158 } 15159 15160 return parent; 15161 } 15162 15163 /** 15164 * <p>Computes the coordinates of this view on the screen. The argument 15165 * must be an array of two integers. After the method returns, the array 15166 * contains the x and y location in that order.</p> 15167 * 15168 * @param location an array of two integers in which to hold the coordinates 15169 */ 15170 public void getLocationOnScreen(int[] location) { 15171 getLocationInWindow(location); 15172 15173 final AttachInfo info = mAttachInfo; 15174 if (info != null) { 15175 location[0] += info.mWindowLeft; 15176 location[1] += info.mWindowTop; 15177 } 15178 } 15179 15180 /** 15181 * <p>Computes the coordinates of this view in its window. The argument 15182 * must be an array of two integers. After the method returns, the array 15183 * contains the x and y location in that order.</p> 15184 * 15185 * @param location an array of two integers in which to hold the coordinates 15186 */ 15187 public void getLocationInWindow(int[] location) { 15188 if (location == null || location.length < 2) { 15189 throw new IllegalArgumentException("location must be an array of two integers"); 15190 } 15191 15192 if (mAttachInfo == null) { 15193 // When the view is not attached to a window, this method does not make sense 15194 location[0] = location[1] = 0; 15195 return; 15196 } 15197 15198 float[] position = mAttachInfo.mTmpTransformLocation; 15199 position[0] = position[1] = 0.0f; 15200 15201 if (!hasIdentityMatrix()) { 15202 getMatrix().mapPoints(position); 15203 } 15204 15205 position[0] += mLeft; 15206 position[1] += mTop; 15207 15208 ViewParent viewParent = mParent; 15209 while (viewParent instanceof View) { 15210 final View view = (View) viewParent; 15211 15212 position[0] -= view.mScrollX; 15213 position[1] -= view.mScrollY; 15214 15215 if (!view.hasIdentityMatrix()) { 15216 view.getMatrix().mapPoints(position); 15217 } 15218 15219 position[0] += view.mLeft; 15220 position[1] += view.mTop; 15221 15222 viewParent = view.mParent; 15223 } 15224 15225 if (viewParent instanceof ViewRootImpl) { 15226 // *cough* 15227 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15228 position[1] -= vr.mCurScrollY; 15229 } 15230 15231 location[0] = (int) (position[0] + 0.5f); 15232 location[1] = (int) (position[1] + 0.5f); 15233 } 15234 15235 /** 15236 * {@hide} 15237 * @param id the id of the view to be found 15238 * @return the view of the specified id, null if cannot be found 15239 */ 15240 protected View findViewTraversal(int id) { 15241 if (id == mID) { 15242 return this; 15243 } 15244 return null; 15245 } 15246 15247 /** 15248 * {@hide} 15249 * @param tag the tag of the view to be found 15250 * @return the view of specified tag, null if cannot be found 15251 */ 15252 protected View findViewWithTagTraversal(Object tag) { 15253 if (tag != null && tag.equals(mTag)) { 15254 return this; 15255 } 15256 return null; 15257 } 15258 15259 /** 15260 * {@hide} 15261 * @param predicate The predicate to evaluate. 15262 * @param childToSkip If not null, ignores this child during the recursive traversal. 15263 * @return The first view that matches the predicate or null. 15264 */ 15265 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15266 if (predicate.apply(this)) { 15267 return this; 15268 } 15269 return null; 15270 } 15271 15272 /** 15273 * Look for a child view with the given id. If this view has the given 15274 * id, return this view. 15275 * 15276 * @param id The id to search for. 15277 * @return The view that has the given id in the hierarchy or null 15278 */ 15279 public final View findViewById(int id) { 15280 if (id < 0) { 15281 return null; 15282 } 15283 return findViewTraversal(id); 15284 } 15285 15286 /** 15287 * Finds a view by its unuque and stable accessibility id. 15288 * 15289 * @param accessibilityId The searched accessibility id. 15290 * @return The found view. 15291 */ 15292 final View findViewByAccessibilityId(int accessibilityId) { 15293 if (accessibilityId < 0) { 15294 return null; 15295 } 15296 return findViewByAccessibilityIdTraversal(accessibilityId); 15297 } 15298 15299 /** 15300 * Performs the traversal to find a view by its unuque and stable accessibility id. 15301 * 15302 * <strong>Note:</strong>This method does not stop at the root namespace 15303 * boundary since the user can touch the screen at an arbitrary location 15304 * potentially crossing the root namespace bounday which will send an 15305 * accessibility event to accessibility services and they should be able 15306 * to obtain the event source. Also accessibility ids are guaranteed to be 15307 * unique in the window. 15308 * 15309 * @param accessibilityId The accessibility id. 15310 * @return The found view. 15311 */ 15312 View findViewByAccessibilityIdTraversal(int accessibilityId) { 15313 if (getAccessibilityViewId() == accessibilityId) { 15314 return this; 15315 } 15316 return null; 15317 } 15318 15319 /** 15320 * Look for a child view with the given tag. If this view has the given 15321 * tag, return this view. 15322 * 15323 * @param tag The tag to search for, using "tag.equals(getTag())". 15324 * @return The View that has the given tag in the hierarchy or null 15325 */ 15326 public final View findViewWithTag(Object tag) { 15327 if (tag == null) { 15328 return null; 15329 } 15330 return findViewWithTagTraversal(tag); 15331 } 15332 15333 /** 15334 * {@hide} 15335 * Look for a child view that matches the specified predicate. 15336 * If this view matches the predicate, return this view. 15337 * 15338 * @param predicate The predicate to evaluate. 15339 * @return The first view that matches the predicate or null. 15340 */ 15341 public final View findViewByPredicate(Predicate<View> predicate) { 15342 return findViewByPredicateTraversal(predicate, null); 15343 } 15344 15345 /** 15346 * {@hide} 15347 * Look for a child view that matches the specified predicate, 15348 * starting with the specified view and its descendents and then 15349 * recusively searching the ancestors and siblings of that view 15350 * until this view is reached. 15351 * 15352 * This method is useful in cases where the predicate does not match 15353 * a single unique view (perhaps multiple views use the same id) 15354 * and we are trying to find the view that is "closest" in scope to the 15355 * starting view. 15356 * 15357 * @param start The view to start from. 15358 * @param predicate The predicate to evaluate. 15359 * @return The first view that matches the predicate or null. 15360 */ 15361 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 15362 View childToSkip = null; 15363 for (;;) { 15364 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 15365 if (view != null || start == this) { 15366 return view; 15367 } 15368 15369 ViewParent parent = start.getParent(); 15370 if (parent == null || !(parent instanceof View)) { 15371 return null; 15372 } 15373 15374 childToSkip = start; 15375 start = (View) parent; 15376 } 15377 } 15378 15379 /** 15380 * Sets the identifier for this view. The identifier does not have to be 15381 * unique in this view's hierarchy. The identifier should be a positive 15382 * number. 15383 * 15384 * @see #NO_ID 15385 * @see #getId() 15386 * @see #findViewById(int) 15387 * 15388 * @param id a number used to identify the view 15389 * 15390 * @attr ref android.R.styleable#View_id 15391 */ 15392 public void setId(int id) { 15393 mID = id; 15394 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 15395 mID = generateViewId(); 15396 } 15397 } 15398 15399 /** 15400 * {@hide} 15401 * 15402 * @param isRoot true if the view belongs to the root namespace, false 15403 * otherwise 15404 */ 15405 public void setIsRootNamespace(boolean isRoot) { 15406 if (isRoot) { 15407 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 15408 } else { 15409 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 15410 } 15411 } 15412 15413 /** 15414 * {@hide} 15415 * 15416 * @return true if the view belongs to the root namespace, false otherwise 15417 */ 15418 public boolean isRootNamespace() { 15419 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 15420 } 15421 15422 /** 15423 * Returns this view's identifier. 15424 * 15425 * @return a positive integer used to identify the view or {@link #NO_ID} 15426 * if the view has no ID 15427 * 15428 * @see #setId(int) 15429 * @see #findViewById(int) 15430 * @attr ref android.R.styleable#View_id 15431 */ 15432 @ViewDebug.CapturedViewProperty 15433 public int getId() { 15434 return mID; 15435 } 15436 15437 /** 15438 * Returns this view's tag. 15439 * 15440 * @return the Object stored in this view as a tag 15441 * 15442 * @see #setTag(Object) 15443 * @see #getTag(int) 15444 */ 15445 @ViewDebug.ExportedProperty 15446 public Object getTag() { 15447 return mTag; 15448 } 15449 15450 /** 15451 * Sets the tag associated with this view. A tag can be used to mark 15452 * a view in its hierarchy and does not have to be unique within the 15453 * hierarchy. Tags can also be used to store data within a view without 15454 * resorting to another data structure. 15455 * 15456 * @param tag an Object to tag the view with 15457 * 15458 * @see #getTag() 15459 * @see #setTag(int, Object) 15460 */ 15461 public void setTag(final Object tag) { 15462 mTag = tag; 15463 } 15464 15465 /** 15466 * Returns the tag associated with this view and the specified key. 15467 * 15468 * @param key The key identifying the tag 15469 * 15470 * @return the Object stored in this view as a tag 15471 * 15472 * @see #setTag(int, Object) 15473 * @see #getTag() 15474 */ 15475 public Object getTag(int key) { 15476 if (mKeyedTags != null) return mKeyedTags.get(key); 15477 return null; 15478 } 15479 15480 /** 15481 * Sets a tag associated with this view and a key. A tag can be used 15482 * to mark a view in its hierarchy and does not have to be unique within 15483 * the hierarchy. Tags can also be used to store data within a view 15484 * without resorting to another data structure. 15485 * 15486 * The specified key should be an id declared in the resources of the 15487 * application to ensure it is unique (see the <a 15488 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 15489 * Keys identified as belonging to 15490 * the Android framework or not associated with any package will cause 15491 * an {@link IllegalArgumentException} to be thrown. 15492 * 15493 * @param key The key identifying the tag 15494 * @param tag An Object to tag the view with 15495 * 15496 * @throws IllegalArgumentException If they specified key is not valid 15497 * 15498 * @see #setTag(Object) 15499 * @see #getTag(int) 15500 */ 15501 public void setTag(int key, final Object tag) { 15502 // If the package id is 0x00 or 0x01, it's either an undefined package 15503 // or a framework id 15504 if ((key >>> 24) < 2) { 15505 throw new IllegalArgumentException("The key must be an application-specific " 15506 + "resource id."); 15507 } 15508 15509 setKeyedTag(key, tag); 15510 } 15511 15512 /** 15513 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 15514 * framework id. 15515 * 15516 * @hide 15517 */ 15518 public void setTagInternal(int key, Object tag) { 15519 if ((key >>> 24) != 0x1) { 15520 throw new IllegalArgumentException("The key must be a framework-specific " 15521 + "resource id."); 15522 } 15523 15524 setKeyedTag(key, tag); 15525 } 15526 15527 private void setKeyedTag(int key, Object tag) { 15528 if (mKeyedTags == null) { 15529 mKeyedTags = new SparseArray<Object>(); 15530 } 15531 15532 mKeyedTags.put(key, tag); 15533 } 15534 15535 /** 15536 * Prints information about this view in the log output, with the tag 15537 * {@link #VIEW_LOG_TAG}. 15538 * 15539 * @hide 15540 */ 15541 public void debug() { 15542 debug(0); 15543 } 15544 15545 /** 15546 * Prints information about this view in the log output, with the tag 15547 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 15548 * indentation defined by the <code>depth</code>. 15549 * 15550 * @param depth the indentation level 15551 * 15552 * @hide 15553 */ 15554 protected void debug(int depth) { 15555 String output = debugIndent(depth - 1); 15556 15557 output += "+ " + this; 15558 int id = getId(); 15559 if (id != -1) { 15560 output += " (id=" + id + ")"; 15561 } 15562 Object tag = getTag(); 15563 if (tag != null) { 15564 output += " (tag=" + tag + ")"; 15565 } 15566 Log.d(VIEW_LOG_TAG, output); 15567 15568 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 15569 output = debugIndent(depth) + " FOCUSED"; 15570 Log.d(VIEW_LOG_TAG, output); 15571 } 15572 15573 output = debugIndent(depth); 15574 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 15575 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 15576 + "} "; 15577 Log.d(VIEW_LOG_TAG, output); 15578 15579 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 15580 || mPaddingBottom != 0) { 15581 output = debugIndent(depth); 15582 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 15583 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 15584 Log.d(VIEW_LOG_TAG, output); 15585 } 15586 15587 output = debugIndent(depth); 15588 output += "mMeasureWidth=" + mMeasuredWidth + 15589 " mMeasureHeight=" + mMeasuredHeight; 15590 Log.d(VIEW_LOG_TAG, output); 15591 15592 output = debugIndent(depth); 15593 if (mLayoutParams == null) { 15594 output += "BAD! no layout params"; 15595 } else { 15596 output = mLayoutParams.debug(output); 15597 } 15598 Log.d(VIEW_LOG_TAG, output); 15599 15600 output = debugIndent(depth); 15601 output += "flags={"; 15602 output += View.printFlags(mViewFlags); 15603 output += "}"; 15604 Log.d(VIEW_LOG_TAG, output); 15605 15606 output = debugIndent(depth); 15607 output += "privateFlags={"; 15608 output += View.printPrivateFlags(mPrivateFlags); 15609 output += "}"; 15610 Log.d(VIEW_LOG_TAG, output); 15611 } 15612 15613 /** 15614 * Creates a string of whitespaces used for indentation. 15615 * 15616 * @param depth the indentation level 15617 * @return a String containing (depth * 2 + 3) * 2 white spaces 15618 * 15619 * @hide 15620 */ 15621 protected static String debugIndent(int depth) { 15622 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 15623 for (int i = 0; i < (depth * 2) + 3; i++) { 15624 spaces.append(' ').append(' '); 15625 } 15626 return spaces.toString(); 15627 } 15628 15629 /** 15630 * <p>Return the offset of the widget's text baseline from the widget's top 15631 * boundary. If this widget does not support baseline alignment, this 15632 * method returns -1. </p> 15633 * 15634 * @return the offset of the baseline within the widget's bounds or -1 15635 * if baseline alignment is not supported 15636 */ 15637 @ViewDebug.ExportedProperty(category = "layout") 15638 public int getBaseline() { 15639 return -1; 15640 } 15641 15642 /** 15643 * Returns whether the view hierarchy is currently undergoing a layout pass. This 15644 * information is useful to avoid situations such as calling {@link #requestLayout()} during 15645 * a layout pass. 15646 * 15647 * @return whether the view hierarchy is currently undergoing a layout pass 15648 */ 15649 public boolean isInLayout() { 15650 ViewRootImpl viewRoot = getViewRootImpl(); 15651 return (viewRoot != null && viewRoot.isInLayout()); 15652 } 15653 15654 /** 15655 * Call this when something has changed which has invalidated the 15656 * layout of this view. This will schedule a layout pass of the view 15657 * tree. This should not be called while the view hierarchy is currently in a layout 15658 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 15659 * end of the current layout pass (and then layout will run again) or after the current 15660 * frame is drawn and the next layout occurs. 15661 * 15662 * <p>Subclasses which override this method should call the superclass method to 15663 * handle possible request-during-layout errors correctly.</p> 15664 */ 15665 public void requestLayout() { 15666 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 15667 // Only trigger request-during-layout logic if this is the view requesting it, 15668 // not the views in its parent hierarchy 15669 ViewRootImpl viewRoot = getViewRootImpl(); 15670 if (viewRoot != null && viewRoot.isInLayout()) { 15671 if (!viewRoot.requestLayoutDuringLayout(this)) { 15672 return; 15673 } 15674 } 15675 mAttachInfo.mViewRequestingLayout = this; 15676 } 15677 15678 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15679 mPrivateFlags |= PFLAG_INVALIDATED; 15680 15681 if (mParent != null && !mParent.isLayoutRequested()) { 15682 mParent.requestLayout(); 15683 } 15684 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 15685 mAttachInfo.mViewRequestingLayout = null; 15686 } 15687 } 15688 15689 /** 15690 * Forces this view to be laid out during the next layout pass. 15691 * This method does not call requestLayout() or forceLayout() 15692 * on the parent. 15693 */ 15694 public void forceLayout() { 15695 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15696 mPrivateFlags |= PFLAG_INVALIDATED; 15697 } 15698 15699 /** 15700 * <p> 15701 * This is called to find out how big a view should be. The parent 15702 * supplies constraint information in the width and height parameters. 15703 * </p> 15704 * 15705 * <p> 15706 * The actual measurement work of a view is performed in 15707 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 15708 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 15709 * </p> 15710 * 15711 * 15712 * @param widthMeasureSpec Horizontal space requirements as imposed by the 15713 * parent 15714 * @param heightMeasureSpec Vertical space requirements as imposed by the 15715 * parent 15716 * 15717 * @see #onMeasure(int, int) 15718 */ 15719 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 15720 boolean optical = isLayoutModeOptical(this); 15721 if (optical != isLayoutModeOptical(mParent)) { 15722 Insets insets = getOpticalInsets(); 15723 int oWidth = insets.left + insets.right; 15724 int oHeight = insets.top + insets.bottom; 15725 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 15726 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 15727 } 15728 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 15729 widthMeasureSpec != mOldWidthMeasureSpec || 15730 heightMeasureSpec != mOldHeightMeasureSpec) { 15731 15732 // first clears the measured dimension flag 15733 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 15734 15735 resolveRtlPropertiesIfNeeded(); 15736 15737 // measure ourselves, this should set the measured dimension flag back 15738 onMeasure(widthMeasureSpec, heightMeasureSpec); 15739 15740 // flag not set, setMeasuredDimension() was not invoked, we raise 15741 // an exception to warn the developer 15742 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 15743 throw new IllegalStateException("onMeasure() did not set the" 15744 + " measured dimension by calling" 15745 + " setMeasuredDimension()"); 15746 } 15747 15748 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 15749 } 15750 15751 mOldWidthMeasureSpec = widthMeasureSpec; 15752 mOldHeightMeasureSpec = heightMeasureSpec; 15753 } 15754 15755 /** 15756 * <p> 15757 * Measure the view and its content to determine the measured width and the 15758 * measured height. This method is invoked by {@link #measure(int, int)} and 15759 * should be overriden by subclasses to provide accurate and efficient 15760 * measurement of their contents. 15761 * </p> 15762 * 15763 * <p> 15764 * <strong>CONTRACT:</strong> When overriding this method, you 15765 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15766 * measured width and height of this view. Failure to do so will trigger an 15767 * <code>IllegalStateException</code>, thrown by 15768 * {@link #measure(int, int)}. Calling the superclass' 15769 * {@link #onMeasure(int, int)} is a valid use. 15770 * </p> 15771 * 15772 * <p> 15773 * The base class implementation of measure defaults to the background size, 15774 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15775 * override {@link #onMeasure(int, int)} to provide better measurements of 15776 * their content. 15777 * </p> 15778 * 15779 * <p> 15780 * If this method is overridden, it is the subclass's responsibility to make 15781 * sure the measured height and width are at least the view's minimum height 15782 * and width ({@link #getSuggestedMinimumHeight()} and 15783 * {@link #getSuggestedMinimumWidth()}). 15784 * </p> 15785 * 15786 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15787 * The requirements are encoded with 15788 * {@link android.view.View.MeasureSpec}. 15789 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15790 * The requirements are encoded with 15791 * {@link android.view.View.MeasureSpec}. 15792 * 15793 * @see #getMeasuredWidth() 15794 * @see #getMeasuredHeight() 15795 * @see #setMeasuredDimension(int, int) 15796 * @see #getSuggestedMinimumHeight() 15797 * @see #getSuggestedMinimumWidth() 15798 * @see android.view.View.MeasureSpec#getMode(int) 15799 * @see android.view.View.MeasureSpec#getSize(int) 15800 */ 15801 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15802 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15803 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15804 } 15805 15806 /** 15807 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15808 * measured width and measured height. Failing to do so will trigger an 15809 * exception at measurement time.</p> 15810 * 15811 * @param measuredWidth The measured width of this view. May be a complex 15812 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15813 * {@link #MEASURED_STATE_TOO_SMALL}. 15814 * @param measuredHeight The measured height of this view. May be a complex 15815 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15816 * {@link #MEASURED_STATE_TOO_SMALL}. 15817 */ 15818 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15819 boolean optical = isLayoutModeOptical(this); 15820 if (optical != isLayoutModeOptical(mParent)) { 15821 Insets insets = getOpticalInsets(); 15822 int opticalWidth = insets.left + insets.right; 15823 int opticalHeight = insets.top + insets.bottom; 15824 15825 measuredWidth += optical ? opticalWidth : -opticalWidth; 15826 measuredHeight += optical ? opticalHeight : -opticalHeight; 15827 } 15828 mMeasuredWidth = measuredWidth; 15829 mMeasuredHeight = measuredHeight; 15830 15831 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 15832 } 15833 15834 /** 15835 * Merge two states as returned by {@link #getMeasuredState()}. 15836 * @param curState The current state as returned from a view or the result 15837 * of combining multiple views. 15838 * @param newState The new view state to combine. 15839 * @return Returns a new integer reflecting the combination of the two 15840 * states. 15841 */ 15842 public static int combineMeasuredStates(int curState, int newState) { 15843 return curState | newState; 15844 } 15845 15846 /** 15847 * Version of {@link #resolveSizeAndState(int, int, int)} 15848 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15849 */ 15850 public static int resolveSize(int size, int measureSpec) { 15851 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15852 } 15853 15854 /** 15855 * Utility to reconcile a desired size and state, with constraints imposed 15856 * by a MeasureSpec. Will take the desired size, unless a different size 15857 * is imposed by the constraints. The returned value is a compound integer, 15858 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15859 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15860 * size is smaller than the size the view wants to be. 15861 * 15862 * @param size How big the view wants to be 15863 * @param measureSpec Constraints imposed by the parent 15864 * @return Size information bit mask as defined by 15865 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15866 */ 15867 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15868 int result = size; 15869 int specMode = MeasureSpec.getMode(measureSpec); 15870 int specSize = MeasureSpec.getSize(measureSpec); 15871 switch (specMode) { 15872 case MeasureSpec.UNSPECIFIED: 15873 result = size; 15874 break; 15875 case MeasureSpec.AT_MOST: 15876 if (specSize < size) { 15877 result = specSize | MEASURED_STATE_TOO_SMALL; 15878 } else { 15879 result = size; 15880 } 15881 break; 15882 case MeasureSpec.EXACTLY: 15883 result = specSize; 15884 break; 15885 } 15886 return result | (childMeasuredState&MEASURED_STATE_MASK); 15887 } 15888 15889 /** 15890 * Utility to return a default size. Uses the supplied size if the 15891 * MeasureSpec imposed no constraints. Will get larger if allowed 15892 * by the MeasureSpec. 15893 * 15894 * @param size Default size for this view 15895 * @param measureSpec Constraints imposed by the parent 15896 * @return The size this view should be. 15897 */ 15898 public static int getDefaultSize(int size, int measureSpec) { 15899 int result = size; 15900 int specMode = MeasureSpec.getMode(measureSpec); 15901 int specSize = MeasureSpec.getSize(measureSpec); 15902 15903 switch (specMode) { 15904 case MeasureSpec.UNSPECIFIED: 15905 result = size; 15906 break; 15907 case MeasureSpec.AT_MOST: 15908 case MeasureSpec.EXACTLY: 15909 result = specSize; 15910 break; 15911 } 15912 return result; 15913 } 15914 15915 /** 15916 * Returns the suggested minimum height that the view should use. This 15917 * returns the maximum of the view's minimum height 15918 * and the background's minimum height 15919 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15920 * <p> 15921 * When being used in {@link #onMeasure(int, int)}, the caller should still 15922 * ensure the returned height is within the requirements of the parent. 15923 * 15924 * @return The suggested minimum height of the view. 15925 */ 15926 protected int getSuggestedMinimumHeight() { 15927 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15928 15929 } 15930 15931 /** 15932 * Returns the suggested minimum width that the view should use. This 15933 * returns the maximum of the view's minimum width) 15934 * and the background's minimum width 15935 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15936 * <p> 15937 * When being used in {@link #onMeasure(int, int)}, the caller should still 15938 * ensure the returned width is within the requirements of the parent. 15939 * 15940 * @return The suggested minimum width of the view. 15941 */ 15942 protected int getSuggestedMinimumWidth() { 15943 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15944 } 15945 15946 /** 15947 * Returns the minimum height of the view. 15948 * 15949 * @return the minimum height the view will try to be. 15950 * 15951 * @see #setMinimumHeight(int) 15952 * 15953 * @attr ref android.R.styleable#View_minHeight 15954 */ 15955 public int getMinimumHeight() { 15956 return mMinHeight; 15957 } 15958 15959 /** 15960 * Sets the minimum height of the view. It is not guaranteed the view will 15961 * be able to achieve this minimum height (for example, if its parent layout 15962 * constrains it with less available height). 15963 * 15964 * @param minHeight The minimum height the view will try to be. 15965 * 15966 * @see #getMinimumHeight() 15967 * 15968 * @attr ref android.R.styleable#View_minHeight 15969 */ 15970 public void setMinimumHeight(int minHeight) { 15971 mMinHeight = minHeight; 15972 requestLayout(); 15973 } 15974 15975 /** 15976 * Returns the minimum width of the view. 15977 * 15978 * @return the minimum width the view will try to be. 15979 * 15980 * @see #setMinimumWidth(int) 15981 * 15982 * @attr ref android.R.styleable#View_minWidth 15983 */ 15984 public int getMinimumWidth() { 15985 return mMinWidth; 15986 } 15987 15988 /** 15989 * Sets the minimum width of the view. It is not guaranteed the view will 15990 * be able to achieve this minimum width (for example, if its parent layout 15991 * constrains it with less available width). 15992 * 15993 * @param minWidth The minimum width the view will try to be. 15994 * 15995 * @see #getMinimumWidth() 15996 * 15997 * @attr ref android.R.styleable#View_minWidth 15998 */ 15999 public void setMinimumWidth(int minWidth) { 16000 mMinWidth = minWidth; 16001 requestLayout(); 16002 16003 } 16004 16005 /** 16006 * Get the animation currently associated with this view. 16007 * 16008 * @return The animation that is currently playing or 16009 * scheduled to play for this view. 16010 */ 16011 public Animation getAnimation() { 16012 return mCurrentAnimation; 16013 } 16014 16015 /** 16016 * Start the specified animation now. 16017 * 16018 * @param animation the animation to start now 16019 */ 16020 public void startAnimation(Animation animation) { 16021 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 16022 setAnimation(animation); 16023 invalidateParentCaches(); 16024 invalidate(true); 16025 } 16026 16027 /** 16028 * Cancels any animations for this view. 16029 */ 16030 public void clearAnimation() { 16031 if (mCurrentAnimation != null) { 16032 mCurrentAnimation.detach(); 16033 } 16034 mCurrentAnimation = null; 16035 invalidateParentIfNeeded(); 16036 } 16037 16038 /** 16039 * Sets the next animation to play for this view. 16040 * If you want the animation to play immediately, use 16041 * {@link #startAnimation(android.view.animation.Animation)} instead. 16042 * This method provides allows fine-grained 16043 * control over the start time and invalidation, but you 16044 * must make sure that 1) the animation has a start time set, and 16045 * 2) the view's parent (which controls animations on its children) 16046 * will be invalidated when the animation is supposed to 16047 * start. 16048 * 16049 * @param animation The next animation, or null. 16050 */ 16051 public void setAnimation(Animation animation) { 16052 mCurrentAnimation = animation; 16053 16054 if (animation != null) { 16055 // If the screen is off assume the animation start time is now instead of 16056 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 16057 // would cause the animation to start when the screen turns back on 16058 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 16059 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 16060 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 16061 } 16062 animation.reset(); 16063 } 16064 } 16065 16066 /** 16067 * Invoked by a parent ViewGroup to notify the start of the animation 16068 * currently associated with this view. If you override this method, 16069 * always call super.onAnimationStart(); 16070 * 16071 * @see #setAnimation(android.view.animation.Animation) 16072 * @see #getAnimation() 16073 */ 16074 protected void onAnimationStart() { 16075 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 16076 } 16077 16078 /** 16079 * Invoked by a parent ViewGroup to notify the end of the animation 16080 * currently associated with this view. If you override this method, 16081 * always call super.onAnimationEnd(); 16082 * 16083 * @see #setAnimation(android.view.animation.Animation) 16084 * @see #getAnimation() 16085 */ 16086 protected void onAnimationEnd() { 16087 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 16088 } 16089 16090 /** 16091 * Invoked if there is a Transform that involves alpha. Subclass that can 16092 * draw themselves with the specified alpha should return true, and then 16093 * respect that alpha when their onDraw() is called. If this returns false 16094 * then the view may be redirected to draw into an offscreen buffer to 16095 * fulfill the request, which will look fine, but may be slower than if the 16096 * subclass handles it internally. The default implementation returns false. 16097 * 16098 * @param alpha The alpha (0..255) to apply to the view's drawing 16099 * @return true if the view can draw with the specified alpha. 16100 */ 16101 protected boolean onSetAlpha(int alpha) { 16102 return false; 16103 } 16104 16105 /** 16106 * This is used by the RootView to perform an optimization when 16107 * the view hierarchy contains one or several SurfaceView. 16108 * SurfaceView is always considered transparent, but its children are not, 16109 * therefore all View objects remove themselves from the global transparent 16110 * region (passed as a parameter to this function). 16111 * 16112 * @param region The transparent region for this ViewAncestor (window). 16113 * 16114 * @return Returns true if the effective visibility of the view at this 16115 * point is opaque, regardless of the transparent region; returns false 16116 * if it is possible for underlying windows to be seen behind the view. 16117 * 16118 * {@hide} 16119 */ 16120 public boolean gatherTransparentRegion(Region region) { 16121 final AttachInfo attachInfo = mAttachInfo; 16122 if (region != null && attachInfo != null) { 16123 final int pflags = mPrivateFlags; 16124 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 16125 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 16126 // remove it from the transparent region. 16127 final int[] location = attachInfo.mTransparentLocation; 16128 getLocationInWindow(location); 16129 region.op(location[0], location[1], location[0] + mRight - mLeft, 16130 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 16131 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 16132 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 16133 // exists, so we remove the background drawable's non-transparent 16134 // parts from this transparent region. 16135 applyDrawableToTransparentRegion(mBackground, region); 16136 } 16137 } 16138 return true; 16139 } 16140 16141 /** 16142 * Play a sound effect for this view. 16143 * 16144 * <p>The framework will play sound effects for some built in actions, such as 16145 * clicking, but you may wish to play these effects in your widget, 16146 * for instance, for internal navigation. 16147 * 16148 * <p>The sound effect will only be played if sound effects are enabled by the user, and 16149 * {@link #isSoundEffectsEnabled()} is true. 16150 * 16151 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 16152 */ 16153 public void playSoundEffect(int soundConstant) { 16154 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 16155 return; 16156 } 16157 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 16158 } 16159 16160 /** 16161 * BZZZTT!!1! 16162 * 16163 * <p>Provide haptic feedback to the user for this view. 16164 * 16165 * <p>The framework will provide haptic feedback for some built in actions, 16166 * such as long presses, but you may wish to provide feedback for your 16167 * own widget. 16168 * 16169 * <p>The feedback will only be performed if 16170 * {@link #isHapticFeedbackEnabled()} is true. 16171 * 16172 * @param feedbackConstant One of the constants defined in 16173 * {@link HapticFeedbackConstants} 16174 */ 16175 public boolean performHapticFeedback(int feedbackConstant) { 16176 return performHapticFeedback(feedbackConstant, 0); 16177 } 16178 16179 /** 16180 * BZZZTT!!1! 16181 * 16182 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 16183 * 16184 * @param feedbackConstant One of the constants defined in 16185 * {@link HapticFeedbackConstants} 16186 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 16187 */ 16188 public boolean performHapticFeedback(int feedbackConstant, int flags) { 16189 if (mAttachInfo == null) { 16190 return false; 16191 } 16192 //noinspection SimplifiableIfStatement 16193 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 16194 && !isHapticFeedbackEnabled()) { 16195 return false; 16196 } 16197 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 16198 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 16199 } 16200 16201 /** 16202 * Request that the visibility of the status bar or other screen/window 16203 * decorations be changed. 16204 * 16205 * <p>This method is used to put the over device UI into temporary modes 16206 * where the user's attention is focused more on the application content, 16207 * by dimming or hiding surrounding system affordances. This is typically 16208 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16209 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16210 * to be placed behind the action bar (and with these flags other system 16211 * affordances) so that smooth transitions between hiding and showing them 16212 * can be done. 16213 * 16214 * <p>Two representative examples of the use of system UI visibility is 16215 * implementing a content browsing application (like a magazine reader) 16216 * and a video playing application. 16217 * 16218 * <p>The first code shows a typical implementation of a View in a content 16219 * browsing application. In this implementation, the application goes 16220 * into a content-oriented mode by hiding the status bar and action bar, 16221 * and putting the navigation elements into lights out mode. The user can 16222 * then interact with content while in this mode. Such an application should 16223 * provide an easy way for the user to toggle out of the mode (such as to 16224 * check information in the status bar or access notifications). In the 16225 * implementation here, this is done simply by tapping on the content. 16226 * 16227 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16228 * content} 16229 * 16230 * <p>This second code sample shows a typical implementation of a View 16231 * in a video playing application. In this situation, while the video is 16232 * playing the application would like to go into a complete full-screen mode, 16233 * to use as much of the display as possible for the video. When in this state 16234 * the user can not interact with the application; the system intercepts 16235 * touching on the screen to pop the UI out of full screen mode. See 16236 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16237 * 16238 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16239 * content} 16240 * 16241 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16242 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16243 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16244 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16245 */ 16246 public void setSystemUiVisibility(int visibility) { 16247 if (visibility != mSystemUiVisibility) { 16248 mSystemUiVisibility = visibility; 16249 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16250 mParent.recomputeViewAttributes(this); 16251 } 16252 } 16253 } 16254 16255 /** 16256 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 16257 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16258 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16259 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16260 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16261 */ 16262 public int getSystemUiVisibility() { 16263 return mSystemUiVisibility; 16264 } 16265 16266 /** 16267 * Returns the current system UI visibility that is currently set for 16268 * the entire window. This is the combination of the 16269 * {@link #setSystemUiVisibility(int)} values supplied by all of the 16270 * views in the window. 16271 */ 16272 public int getWindowSystemUiVisibility() { 16273 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 16274 } 16275 16276 /** 16277 * Override to find out when the window's requested system UI visibility 16278 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 16279 * This is different from the callbacks recieved through 16280 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 16281 * in that this is only telling you about the local request of the window, 16282 * not the actual values applied by the system. 16283 */ 16284 public void onWindowSystemUiVisibilityChanged(int visible) { 16285 } 16286 16287 /** 16288 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 16289 * the view hierarchy. 16290 */ 16291 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 16292 onWindowSystemUiVisibilityChanged(visible); 16293 } 16294 16295 /** 16296 * Set a listener to receive callbacks when the visibility of the system bar changes. 16297 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 16298 */ 16299 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 16300 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 16301 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16302 mParent.recomputeViewAttributes(this); 16303 } 16304 } 16305 16306 /** 16307 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 16308 * the view hierarchy. 16309 */ 16310 public void dispatchSystemUiVisibilityChanged(int visibility) { 16311 ListenerInfo li = mListenerInfo; 16312 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 16313 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 16314 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 16315 } 16316 } 16317 16318 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 16319 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 16320 if (val != mSystemUiVisibility) { 16321 setSystemUiVisibility(val); 16322 return true; 16323 } 16324 return false; 16325 } 16326 16327 /** @hide */ 16328 public void setDisabledSystemUiVisibility(int flags) { 16329 if (mAttachInfo != null) { 16330 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 16331 mAttachInfo.mDisabledSystemUiVisibility = flags; 16332 if (mParent != null) { 16333 mParent.recomputeViewAttributes(this); 16334 } 16335 } 16336 } 16337 } 16338 16339 /** 16340 * Creates an image that the system displays during the drag and drop 16341 * operation. This is called a "drag shadow". The default implementation 16342 * for a DragShadowBuilder based on a View returns an image that has exactly the same 16343 * appearance as the given View. The default also positions the center of the drag shadow 16344 * directly under the touch point. If no View is provided (the constructor with no parameters 16345 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 16346 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 16347 * default is an invisible drag shadow. 16348 * <p> 16349 * You are not required to use the View you provide to the constructor as the basis of the 16350 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 16351 * anything you want as the drag shadow. 16352 * </p> 16353 * <p> 16354 * You pass a DragShadowBuilder object to the system when you start the drag. The system 16355 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 16356 * size and position of the drag shadow. It uses this data to construct a 16357 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 16358 * so that your application can draw the shadow image in the Canvas. 16359 * </p> 16360 * 16361 * <div class="special reference"> 16362 * <h3>Developer Guides</h3> 16363 * <p>For a guide to implementing drag and drop features, read the 16364 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16365 * </div> 16366 */ 16367 public static class DragShadowBuilder { 16368 private final WeakReference<View> mView; 16369 16370 /** 16371 * Constructs a shadow image builder based on a View. By default, the resulting drag 16372 * shadow will have the same appearance and dimensions as the View, with the touch point 16373 * over the center of the View. 16374 * @param view A View. Any View in scope can be used. 16375 */ 16376 public DragShadowBuilder(View view) { 16377 mView = new WeakReference<View>(view); 16378 } 16379 16380 /** 16381 * Construct a shadow builder object with no associated View. This 16382 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 16383 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 16384 * to supply the drag shadow's dimensions and appearance without 16385 * reference to any View object. If they are not overridden, then the result is an 16386 * invisible drag shadow. 16387 */ 16388 public DragShadowBuilder() { 16389 mView = new WeakReference<View>(null); 16390 } 16391 16392 /** 16393 * Returns the View object that had been passed to the 16394 * {@link #View.DragShadowBuilder(View)} 16395 * constructor. If that View parameter was {@code null} or if the 16396 * {@link #View.DragShadowBuilder()} 16397 * constructor was used to instantiate the builder object, this method will return 16398 * null. 16399 * 16400 * @return The View object associate with this builder object. 16401 */ 16402 @SuppressWarnings({"JavadocReference"}) 16403 final public View getView() { 16404 return mView.get(); 16405 } 16406 16407 /** 16408 * Provides the metrics for the shadow image. These include the dimensions of 16409 * the shadow image, and the point within that shadow that should 16410 * be centered under the touch location while dragging. 16411 * <p> 16412 * The default implementation sets the dimensions of the shadow to be the 16413 * same as the dimensions of the View itself and centers the shadow under 16414 * the touch point. 16415 * </p> 16416 * 16417 * @param shadowSize A {@link android.graphics.Point} containing the width and height 16418 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 16419 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 16420 * image. 16421 * 16422 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 16423 * shadow image that should be underneath the touch point during the drag and drop 16424 * operation. Your application must set {@link android.graphics.Point#x} to the 16425 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 16426 */ 16427 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 16428 final View view = mView.get(); 16429 if (view != null) { 16430 shadowSize.set(view.getWidth(), view.getHeight()); 16431 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 16432 } else { 16433 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 16434 } 16435 } 16436 16437 /** 16438 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 16439 * based on the dimensions it received from the 16440 * {@link #onProvideShadowMetrics(Point, Point)} callback. 16441 * 16442 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 16443 */ 16444 public void onDrawShadow(Canvas canvas) { 16445 final View view = mView.get(); 16446 if (view != null) { 16447 view.draw(canvas); 16448 } else { 16449 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 16450 } 16451 } 16452 } 16453 16454 /** 16455 * Starts a drag and drop operation. When your application calls this method, it passes a 16456 * {@link android.view.View.DragShadowBuilder} object to the system. The 16457 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 16458 * to get metrics for the drag shadow, and then calls the object's 16459 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 16460 * <p> 16461 * Once the system has the drag shadow, it begins the drag and drop operation by sending 16462 * drag events to all the View objects in your application that are currently visible. It does 16463 * this either by calling the View object's drag listener (an implementation of 16464 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 16465 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 16466 * Both are passed a {@link android.view.DragEvent} object that has a 16467 * {@link android.view.DragEvent#getAction()} value of 16468 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 16469 * </p> 16470 * <p> 16471 * Your application can invoke startDrag() on any attached View object. The View object does not 16472 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 16473 * be related to the View the user selected for dragging. 16474 * </p> 16475 * @param data A {@link android.content.ClipData} object pointing to the data to be 16476 * transferred by the drag and drop operation. 16477 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 16478 * drag shadow. 16479 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 16480 * drop operation. This Object is put into every DragEvent object sent by the system during the 16481 * current drag. 16482 * <p> 16483 * myLocalState is a lightweight mechanism for the sending information from the dragged View 16484 * to the target Views. For example, it can contain flags that differentiate between a 16485 * a copy operation and a move operation. 16486 * </p> 16487 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 16488 * so the parameter should be set to 0. 16489 * @return {@code true} if the method completes successfully, or 16490 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 16491 * do a drag, and so no drag operation is in progress. 16492 */ 16493 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 16494 Object myLocalState, int flags) { 16495 if (ViewDebug.DEBUG_DRAG) { 16496 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 16497 } 16498 boolean okay = false; 16499 16500 Point shadowSize = new Point(); 16501 Point shadowTouchPoint = new Point(); 16502 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 16503 16504 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 16505 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 16506 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 16507 } 16508 16509 if (ViewDebug.DEBUG_DRAG) { 16510 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 16511 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 16512 } 16513 Surface surface = new Surface(); 16514 try { 16515 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 16516 flags, shadowSize.x, shadowSize.y, surface); 16517 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 16518 + " surface=" + surface); 16519 if (token != null) { 16520 Canvas canvas = surface.lockCanvas(null); 16521 try { 16522 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 16523 shadowBuilder.onDrawShadow(canvas); 16524 } finally { 16525 surface.unlockCanvasAndPost(canvas); 16526 } 16527 16528 final ViewRootImpl root = getViewRootImpl(); 16529 16530 // Cache the local state object for delivery with DragEvents 16531 root.setLocalDragState(myLocalState); 16532 16533 // repurpose 'shadowSize' for the last touch point 16534 root.getLastTouchPoint(shadowSize); 16535 16536 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 16537 shadowSize.x, shadowSize.y, 16538 shadowTouchPoint.x, shadowTouchPoint.y, data); 16539 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 16540 16541 // Off and running! Release our local surface instance; the drag 16542 // shadow surface is now managed by the system process. 16543 surface.release(); 16544 } 16545 } catch (Exception e) { 16546 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 16547 surface.destroy(); 16548 } 16549 16550 return okay; 16551 } 16552 16553 /** 16554 * Handles drag events sent by the system following a call to 16555 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 16556 *<p> 16557 * When the system calls this method, it passes a 16558 * {@link android.view.DragEvent} object. A call to 16559 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 16560 * in DragEvent. The method uses these to determine what is happening in the drag and drop 16561 * operation. 16562 * @param event The {@link android.view.DragEvent} sent by the system. 16563 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 16564 * in DragEvent, indicating the type of drag event represented by this object. 16565 * @return {@code true} if the method was successful, otherwise {@code false}. 16566 * <p> 16567 * The method should return {@code true} in response to an action type of 16568 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 16569 * operation. 16570 * </p> 16571 * <p> 16572 * The method should also return {@code true} in response to an action type of 16573 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 16574 * {@code false} if it didn't. 16575 * </p> 16576 */ 16577 public boolean onDragEvent(DragEvent event) { 16578 return false; 16579 } 16580 16581 /** 16582 * Detects if this View is enabled and has a drag event listener. 16583 * If both are true, then it calls the drag event listener with the 16584 * {@link android.view.DragEvent} it received. If the drag event listener returns 16585 * {@code true}, then dispatchDragEvent() returns {@code true}. 16586 * <p> 16587 * For all other cases, the method calls the 16588 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 16589 * method and returns its result. 16590 * </p> 16591 * <p> 16592 * This ensures that a drag event is always consumed, even if the View does not have a drag 16593 * event listener. However, if the View has a listener and the listener returns true, then 16594 * onDragEvent() is not called. 16595 * </p> 16596 */ 16597 public boolean dispatchDragEvent(DragEvent event) { 16598 //noinspection SimplifiableIfStatement 16599 ListenerInfo li = mListenerInfo; 16600 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 16601 && li.mOnDragListener.onDrag(this, event)) { 16602 return true; 16603 } 16604 return onDragEvent(event); 16605 } 16606 16607 boolean canAcceptDrag() { 16608 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 16609 } 16610 16611 /** 16612 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 16613 * it is ever exposed at all. 16614 * @hide 16615 */ 16616 public void onCloseSystemDialogs(String reason) { 16617 } 16618 16619 /** 16620 * Given a Drawable whose bounds have been set to draw into this view, 16621 * update a Region being computed for 16622 * {@link #gatherTransparentRegion(android.graphics.Region)} so 16623 * that any non-transparent parts of the Drawable are removed from the 16624 * given transparent region. 16625 * 16626 * @param dr The Drawable whose transparency is to be applied to the region. 16627 * @param region A Region holding the current transparency information, 16628 * where any parts of the region that are set are considered to be 16629 * transparent. On return, this region will be modified to have the 16630 * transparency information reduced by the corresponding parts of the 16631 * Drawable that are not transparent. 16632 * {@hide} 16633 */ 16634 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 16635 if (DBG) { 16636 Log.i("View", "Getting transparent region for: " + this); 16637 } 16638 final Region r = dr.getTransparentRegion(); 16639 final Rect db = dr.getBounds(); 16640 final AttachInfo attachInfo = mAttachInfo; 16641 if (r != null && attachInfo != null) { 16642 final int w = getRight()-getLeft(); 16643 final int h = getBottom()-getTop(); 16644 if (db.left > 0) { 16645 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 16646 r.op(0, 0, db.left, h, Region.Op.UNION); 16647 } 16648 if (db.right < w) { 16649 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 16650 r.op(db.right, 0, w, h, Region.Op.UNION); 16651 } 16652 if (db.top > 0) { 16653 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 16654 r.op(0, 0, w, db.top, Region.Op.UNION); 16655 } 16656 if (db.bottom < h) { 16657 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 16658 r.op(0, db.bottom, w, h, Region.Op.UNION); 16659 } 16660 final int[] location = attachInfo.mTransparentLocation; 16661 getLocationInWindow(location); 16662 r.translate(location[0], location[1]); 16663 region.op(r, Region.Op.INTERSECT); 16664 } else { 16665 region.op(db, Region.Op.DIFFERENCE); 16666 } 16667 } 16668 16669 private void checkForLongClick(int delayOffset) { 16670 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 16671 mHasPerformedLongPress = false; 16672 16673 if (mPendingCheckForLongPress == null) { 16674 mPendingCheckForLongPress = new CheckForLongPress(); 16675 } 16676 mPendingCheckForLongPress.rememberWindowAttachCount(); 16677 postDelayed(mPendingCheckForLongPress, 16678 ViewConfiguration.getLongPressTimeout() - delayOffset); 16679 } 16680 } 16681 16682 /** 16683 * Inflate a view from an XML resource. This convenience method wraps the {@link 16684 * LayoutInflater} class, which provides a full range of options for view inflation. 16685 * 16686 * @param context The Context object for your activity or application. 16687 * @param resource The resource ID to inflate 16688 * @param root A view group that will be the parent. Used to properly inflate the 16689 * layout_* parameters. 16690 * @see LayoutInflater 16691 */ 16692 public static View inflate(Context context, int resource, ViewGroup root) { 16693 LayoutInflater factory = LayoutInflater.from(context); 16694 return factory.inflate(resource, root); 16695 } 16696 16697 /** 16698 * Scroll the view with standard behavior for scrolling beyond the normal 16699 * content boundaries. Views that call this method should override 16700 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 16701 * results of an over-scroll operation. 16702 * 16703 * Views can use this method to handle any touch or fling-based scrolling. 16704 * 16705 * @param deltaX Change in X in pixels 16706 * @param deltaY Change in Y in pixels 16707 * @param scrollX Current X scroll value in pixels before applying deltaX 16708 * @param scrollY Current Y scroll value in pixels before applying deltaY 16709 * @param scrollRangeX Maximum content scroll range along the X axis 16710 * @param scrollRangeY Maximum content scroll range along the Y axis 16711 * @param maxOverScrollX Number of pixels to overscroll by in either direction 16712 * along the X axis. 16713 * @param maxOverScrollY Number of pixels to overscroll by in either direction 16714 * along the Y axis. 16715 * @param isTouchEvent true if this scroll operation is the result of a touch event. 16716 * @return true if scrolling was clamped to an over-scroll boundary along either 16717 * axis, false otherwise. 16718 */ 16719 @SuppressWarnings({"UnusedParameters"}) 16720 protected boolean overScrollBy(int deltaX, int deltaY, 16721 int scrollX, int scrollY, 16722 int scrollRangeX, int scrollRangeY, 16723 int maxOverScrollX, int maxOverScrollY, 16724 boolean isTouchEvent) { 16725 final int overScrollMode = mOverScrollMode; 16726 final boolean canScrollHorizontal = 16727 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 16728 final boolean canScrollVertical = 16729 computeVerticalScrollRange() > computeVerticalScrollExtent(); 16730 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 16731 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 16732 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 16733 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 16734 16735 int newScrollX = scrollX + deltaX; 16736 if (!overScrollHorizontal) { 16737 maxOverScrollX = 0; 16738 } 16739 16740 int newScrollY = scrollY + deltaY; 16741 if (!overScrollVertical) { 16742 maxOverScrollY = 0; 16743 } 16744 16745 // Clamp values if at the limits and record 16746 final int left = -maxOverScrollX; 16747 final int right = maxOverScrollX + scrollRangeX; 16748 final int top = -maxOverScrollY; 16749 final int bottom = maxOverScrollY + scrollRangeY; 16750 16751 boolean clampedX = false; 16752 if (newScrollX > right) { 16753 newScrollX = right; 16754 clampedX = true; 16755 } else if (newScrollX < left) { 16756 newScrollX = left; 16757 clampedX = true; 16758 } 16759 16760 boolean clampedY = false; 16761 if (newScrollY > bottom) { 16762 newScrollY = bottom; 16763 clampedY = true; 16764 } else if (newScrollY < top) { 16765 newScrollY = top; 16766 clampedY = true; 16767 } 16768 16769 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16770 16771 return clampedX || clampedY; 16772 } 16773 16774 /** 16775 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16776 * respond to the results of an over-scroll operation. 16777 * 16778 * @param scrollX New X scroll value in pixels 16779 * @param scrollY New Y scroll value in pixels 16780 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16781 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16782 */ 16783 protected void onOverScrolled(int scrollX, int scrollY, 16784 boolean clampedX, boolean clampedY) { 16785 // Intentionally empty. 16786 } 16787 16788 /** 16789 * Returns the over-scroll mode for this view. The result will be 16790 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16791 * (allow over-scrolling only if the view content is larger than the container), 16792 * or {@link #OVER_SCROLL_NEVER}. 16793 * 16794 * @return This view's over-scroll mode. 16795 */ 16796 public int getOverScrollMode() { 16797 return mOverScrollMode; 16798 } 16799 16800 /** 16801 * Set the over-scroll mode for this view. Valid over-scroll modes are 16802 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16803 * (allow over-scrolling only if the view content is larger than the container), 16804 * or {@link #OVER_SCROLL_NEVER}. 16805 * 16806 * Setting the over-scroll mode of a view will have an effect only if the 16807 * view is capable of scrolling. 16808 * 16809 * @param overScrollMode The new over-scroll mode for this view. 16810 */ 16811 public void setOverScrollMode(int overScrollMode) { 16812 if (overScrollMode != OVER_SCROLL_ALWAYS && 16813 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16814 overScrollMode != OVER_SCROLL_NEVER) { 16815 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16816 } 16817 mOverScrollMode = overScrollMode; 16818 } 16819 16820 /** 16821 * Gets a scale factor that determines the distance the view should scroll 16822 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16823 * @return The vertical scroll scale factor. 16824 * @hide 16825 */ 16826 protected float getVerticalScrollFactor() { 16827 if (mVerticalScrollFactor == 0) { 16828 TypedValue outValue = new TypedValue(); 16829 if (!mContext.getTheme().resolveAttribute( 16830 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16831 throw new IllegalStateException( 16832 "Expected theme to define listPreferredItemHeight."); 16833 } 16834 mVerticalScrollFactor = outValue.getDimension( 16835 mContext.getResources().getDisplayMetrics()); 16836 } 16837 return mVerticalScrollFactor; 16838 } 16839 16840 /** 16841 * Gets a scale factor that determines the distance the view should scroll 16842 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16843 * @return The horizontal scroll scale factor. 16844 * @hide 16845 */ 16846 protected float getHorizontalScrollFactor() { 16847 // TODO: Should use something else. 16848 return getVerticalScrollFactor(); 16849 } 16850 16851 /** 16852 * Return the value specifying the text direction or policy that was set with 16853 * {@link #setTextDirection(int)}. 16854 * 16855 * @return the defined text direction. It can be one of: 16856 * 16857 * {@link #TEXT_DIRECTION_INHERIT}, 16858 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16859 * {@link #TEXT_DIRECTION_ANY_RTL}, 16860 * {@link #TEXT_DIRECTION_LTR}, 16861 * {@link #TEXT_DIRECTION_RTL}, 16862 * {@link #TEXT_DIRECTION_LOCALE} 16863 * 16864 * @attr ref android.R.styleable#View_textDirection 16865 * 16866 * @hide 16867 */ 16868 @ViewDebug.ExportedProperty(category = "text", mapping = { 16869 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16870 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16871 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16872 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16873 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16874 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16875 }) 16876 public int getRawTextDirection() { 16877 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 16878 } 16879 16880 /** 16881 * Set the text direction. 16882 * 16883 * @param textDirection the direction to set. Should be one of: 16884 * 16885 * {@link #TEXT_DIRECTION_INHERIT}, 16886 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16887 * {@link #TEXT_DIRECTION_ANY_RTL}, 16888 * {@link #TEXT_DIRECTION_LTR}, 16889 * {@link #TEXT_DIRECTION_RTL}, 16890 * {@link #TEXT_DIRECTION_LOCALE} 16891 * 16892 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 16893 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 16894 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 16895 * 16896 * @attr ref android.R.styleable#View_textDirection 16897 */ 16898 public void setTextDirection(int textDirection) { 16899 if (getRawTextDirection() != textDirection) { 16900 // Reset the current text direction and the resolved one 16901 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 16902 resetResolvedTextDirection(); 16903 // Set the new text direction 16904 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 16905 // Do resolution 16906 resolveTextDirection(); 16907 // Notify change 16908 onRtlPropertiesChanged(getLayoutDirection()); 16909 // Refresh 16910 requestLayout(); 16911 invalidate(true); 16912 } 16913 } 16914 16915 /** 16916 * Return the resolved text direction. 16917 * 16918 * @return the resolved text direction. Returns one of: 16919 * 16920 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16921 * {@link #TEXT_DIRECTION_ANY_RTL}, 16922 * {@link #TEXT_DIRECTION_LTR}, 16923 * {@link #TEXT_DIRECTION_RTL}, 16924 * {@link #TEXT_DIRECTION_LOCALE} 16925 * 16926 * @attr ref android.R.styleable#View_textDirection 16927 */ 16928 public int getTextDirection() { 16929 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16930 } 16931 16932 /** 16933 * Resolve the text direction. 16934 * 16935 * @return true if resolution has been done, false otherwise. 16936 * 16937 * @hide 16938 */ 16939 public boolean resolveTextDirection() { 16940 // Reset any previous text direction resolution 16941 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 16942 16943 if (hasRtlSupport()) { 16944 // Set resolved text direction flag depending on text direction flag 16945 final int textDirection = getRawTextDirection(); 16946 switch(textDirection) { 16947 case TEXT_DIRECTION_INHERIT: 16948 if (!canResolveTextDirection()) { 16949 // We cannot do the resolution if there is no parent, so use the default one 16950 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16951 // Resolution will need to happen again later 16952 return false; 16953 } 16954 16955 // Parent has not yet resolved, so we still return the default 16956 if (!mParent.isTextDirectionResolved()) { 16957 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16958 // Resolution will need to happen again later 16959 return false; 16960 } 16961 16962 // Set current resolved direction to the same value as the parent's one 16963 final int parentResolvedDirection = mParent.getTextDirection(); 16964 switch (parentResolvedDirection) { 16965 case TEXT_DIRECTION_FIRST_STRONG: 16966 case TEXT_DIRECTION_ANY_RTL: 16967 case TEXT_DIRECTION_LTR: 16968 case TEXT_DIRECTION_RTL: 16969 case TEXT_DIRECTION_LOCALE: 16970 mPrivateFlags2 |= 16971 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16972 break; 16973 default: 16974 // Default resolved direction is "first strong" heuristic 16975 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16976 } 16977 break; 16978 case TEXT_DIRECTION_FIRST_STRONG: 16979 case TEXT_DIRECTION_ANY_RTL: 16980 case TEXT_DIRECTION_LTR: 16981 case TEXT_DIRECTION_RTL: 16982 case TEXT_DIRECTION_LOCALE: 16983 // Resolved direction is the same as text direction 16984 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16985 break; 16986 default: 16987 // Default resolved direction is "first strong" heuristic 16988 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16989 } 16990 } else { 16991 // Default resolved direction is "first strong" heuristic 16992 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16993 } 16994 16995 // Set to resolved 16996 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 16997 return true; 16998 } 16999 17000 /** 17001 * Check if text direction resolution can be done. 17002 * 17003 * @return true if text direction resolution can be done otherwise return false. 17004 * 17005 * @hide 17006 */ 17007 public boolean canResolveTextDirection() { 17008 switch (getRawTextDirection()) { 17009 case TEXT_DIRECTION_INHERIT: 17010 return (mParent != null) && mParent.canResolveTextDirection(); 17011 default: 17012 return true; 17013 } 17014 } 17015 17016 /** 17017 * Reset resolved text direction. Text direction will be resolved during a call to 17018 * {@link #onMeasure(int, int)}. 17019 * 17020 * @hide 17021 */ 17022 public void resetResolvedTextDirection() { 17023 // Reset any previous text direction resolution 17024 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17025 // Set to default value 17026 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17027 } 17028 17029 /** 17030 * @return true if text direction is inherited. 17031 * 17032 * @hide 17033 */ 17034 public boolean isTextDirectionInherited() { 17035 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 17036 } 17037 17038 /** 17039 * @return true if text direction is resolved. 17040 * 17041 * @hide 17042 */ 17043 public boolean isTextDirectionResolved() { 17044 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 17045 } 17046 17047 /** 17048 * Return the value specifying the text alignment or policy that was set with 17049 * {@link #setTextAlignment(int)}. 17050 * 17051 * @return the defined text alignment. It can be one of: 17052 * 17053 * {@link #TEXT_ALIGNMENT_INHERIT}, 17054 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17055 * {@link #TEXT_ALIGNMENT_CENTER}, 17056 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17057 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17058 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17059 * {@link #TEXT_ALIGNMENT_VIEW_END} 17060 * 17061 * @attr ref android.R.styleable#View_textAlignment 17062 * 17063 * @hide 17064 */ 17065 @ViewDebug.ExportedProperty(category = "text", mapping = { 17066 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17067 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17068 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17069 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17070 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17071 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17072 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17073 }) 17074 public int getRawTextAlignment() { 17075 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 17076 } 17077 17078 /** 17079 * Set the text alignment. 17080 * 17081 * @param textAlignment The text alignment to set. Should be one of 17082 * 17083 * {@link #TEXT_ALIGNMENT_INHERIT}, 17084 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17085 * {@link #TEXT_ALIGNMENT_CENTER}, 17086 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17087 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17088 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17089 * {@link #TEXT_ALIGNMENT_VIEW_END} 17090 * 17091 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 17092 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 17093 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 17094 * 17095 * @attr ref android.R.styleable#View_textAlignment 17096 */ 17097 public void setTextAlignment(int textAlignment) { 17098 if (textAlignment != getRawTextAlignment()) { 17099 // Reset the current and resolved text alignment 17100 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 17101 resetResolvedTextAlignment(); 17102 // Set the new text alignment 17103 mPrivateFlags2 |= 17104 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 17105 // Do resolution 17106 resolveTextAlignment(); 17107 // Notify change 17108 onRtlPropertiesChanged(getLayoutDirection()); 17109 // Refresh 17110 requestLayout(); 17111 invalidate(true); 17112 } 17113 } 17114 17115 /** 17116 * Return the resolved text alignment. 17117 * 17118 * @return the resolved text alignment. Returns one of: 17119 * 17120 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17121 * {@link #TEXT_ALIGNMENT_CENTER}, 17122 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17123 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17124 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17125 * {@link #TEXT_ALIGNMENT_VIEW_END} 17126 * 17127 * @attr ref android.R.styleable#View_textAlignment 17128 */ 17129 @ViewDebug.ExportedProperty(category = "text", mapping = { 17130 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17131 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17132 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17133 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17134 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17135 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17136 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17137 }) 17138 public int getTextAlignment() { 17139 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 17140 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 17141 } 17142 17143 /** 17144 * Resolve the text alignment. 17145 * 17146 * @return true if resolution has been done, false otherwise. 17147 * 17148 * @hide 17149 */ 17150 public boolean resolveTextAlignment() { 17151 // Reset any previous text alignment resolution 17152 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17153 17154 if (hasRtlSupport()) { 17155 // Set resolved text alignment flag depending on text alignment flag 17156 final int textAlignment = getRawTextAlignment(); 17157 switch (textAlignment) { 17158 case TEXT_ALIGNMENT_INHERIT: 17159 // Check if we can resolve the text alignment 17160 if (!canResolveTextAlignment()) { 17161 // We cannot do the resolution if there is no parent so use the default 17162 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17163 // Resolution will need to happen again later 17164 return false; 17165 } 17166 17167 // Parent has not yet resolved, so we still return the default 17168 if (!mParent.isTextAlignmentResolved()) { 17169 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17170 // Resolution will need to happen again later 17171 return false; 17172 } 17173 17174 final int parentResolvedTextAlignment = mParent.getTextAlignment(); 17175 switch (parentResolvedTextAlignment) { 17176 case TEXT_ALIGNMENT_GRAVITY: 17177 case TEXT_ALIGNMENT_TEXT_START: 17178 case TEXT_ALIGNMENT_TEXT_END: 17179 case TEXT_ALIGNMENT_CENTER: 17180 case TEXT_ALIGNMENT_VIEW_START: 17181 case TEXT_ALIGNMENT_VIEW_END: 17182 // Resolved text alignment is the same as the parent resolved 17183 // text alignment 17184 mPrivateFlags2 |= 17185 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17186 break; 17187 default: 17188 // Use default resolved text alignment 17189 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17190 } 17191 break; 17192 case TEXT_ALIGNMENT_GRAVITY: 17193 case TEXT_ALIGNMENT_TEXT_START: 17194 case TEXT_ALIGNMENT_TEXT_END: 17195 case TEXT_ALIGNMENT_CENTER: 17196 case TEXT_ALIGNMENT_VIEW_START: 17197 case TEXT_ALIGNMENT_VIEW_END: 17198 // Resolved text alignment is the same as text alignment 17199 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17200 break; 17201 default: 17202 // Use default resolved text alignment 17203 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17204 } 17205 } else { 17206 // Use default resolved text alignment 17207 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17208 } 17209 17210 // Set the resolved 17211 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17212 return true; 17213 } 17214 17215 /** 17216 * Check if text alignment resolution can be done. 17217 * 17218 * @return true if text alignment resolution can be done otherwise return false. 17219 * 17220 * @hide 17221 */ 17222 public boolean canResolveTextAlignment() { 17223 switch (getRawTextAlignment()) { 17224 case TEXT_DIRECTION_INHERIT: 17225 return (mParent != null) && mParent.canResolveTextAlignment(); 17226 default: 17227 return true; 17228 } 17229 } 17230 17231 /** 17232 * Reset resolved text alignment. Text alignment will be resolved during a call to 17233 * {@link #onMeasure(int, int)}. 17234 * 17235 * @hide 17236 */ 17237 public void resetResolvedTextAlignment() { 17238 // Reset any previous text alignment resolution 17239 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17240 // Set to default 17241 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17242 } 17243 17244 /** 17245 * @return true if text alignment is inherited. 17246 * 17247 * @hide 17248 */ 17249 public boolean isTextAlignmentInherited() { 17250 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 17251 } 17252 17253 /** 17254 * @return true if text alignment is resolved. 17255 * 17256 * @hide 17257 */ 17258 public boolean isTextAlignmentResolved() { 17259 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17260 } 17261 17262 /** 17263 * Generate a value suitable for use in {@link #setId(int)}. 17264 * This value will not collide with ID values generated at build time by aapt for R.id. 17265 * 17266 * @return a generated ID value 17267 */ 17268 public static int generateViewId() { 17269 for (;;) { 17270 final int result = sNextGeneratedId.get(); 17271 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 17272 int newValue = result + 1; 17273 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 17274 if (sNextGeneratedId.compareAndSet(result, newValue)) { 17275 return result; 17276 } 17277 } 17278 } 17279 17280 // 17281 // Properties 17282 // 17283 /** 17284 * A Property wrapper around the <code>alpha</code> functionality handled by the 17285 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 17286 */ 17287 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 17288 @Override 17289 public void setValue(View object, float value) { 17290 object.setAlpha(value); 17291 } 17292 17293 @Override 17294 public Float get(View object) { 17295 return object.getAlpha(); 17296 } 17297 }; 17298 17299 /** 17300 * A Property wrapper around the <code>translationX</code> functionality handled by the 17301 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 17302 */ 17303 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 17304 @Override 17305 public void setValue(View object, float value) { 17306 object.setTranslationX(value); 17307 } 17308 17309 @Override 17310 public Float get(View object) { 17311 return object.getTranslationX(); 17312 } 17313 }; 17314 17315 /** 17316 * A Property wrapper around the <code>translationY</code> functionality handled by the 17317 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 17318 */ 17319 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 17320 @Override 17321 public void setValue(View object, float value) { 17322 object.setTranslationY(value); 17323 } 17324 17325 @Override 17326 public Float get(View object) { 17327 return object.getTranslationY(); 17328 } 17329 }; 17330 17331 /** 17332 * A Property wrapper around the <code>x</code> functionality handled by the 17333 * {@link View#setX(float)} and {@link View#getX()} methods. 17334 */ 17335 public static final Property<View, Float> X = new FloatProperty<View>("x") { 17336 @Override 17337 public void setValue(View object, float value) { 17338 object.setX(value); 17339 } 17340 17341 @Override 17342 public Float get(View object) { 17343 return object.getX(); 17344 } 17345 }; 17346 17347 /** 17348 * A Property wrapper around the <code>y</code> functionality handled by the 17349 * {@link View#setY(float)} and {@link View#getY()} methods. 17350 */ 17351 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 17352 @Override 17353 public void setValue(View object, float value) { 17354 object.setY(value); 17355 } 17356 17357 @Override 17358 public Float get(View object) { 17359 return object.getY(); 17360 } 17361 }; 17362 17363 /** 17364 * A Property wrapper around the <code>rotation</code> functionality handled by the 17365 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 17366 */ 17367 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 17368 @Override 17369 public void setValue(View object, float value) { 17370 object.setRotation(value); 17371 } 17372 17373 @Override 17374 public Float get(View object) { 17375 return object.getRotation(); 17376 } 17377 }; 17378 17379 /** 17380 * A Property wrapper around the <code>rotationX</code> functionality handled by the 17381 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 17382 */ 17383 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 17384 @Override 17385 public void setValue(View object, float value) { 17386 object.setRotationX(value); 17387 } 17388 17389 @Override 17390 public Float get(View object) { 17391 return object.getRotationX(); 17392 } 17393 }; 17394 17395 /** 17396 * A Property wrapper around the <code>rotationY</code> functionality handled by the 17397 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 17398 */ 17399 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 17400 @Override 17401 public void setValue(View object, float value) { 17402 object.setRotationY(value); 17403 } 17404 17405 @Override 17406 public Float get(View object) { 17407 return object.getRotationY(); 17408 } 17409 }; 17410 17411 /** 17412 * A Property wrapper around the <code>scaleX</code> functionality handled by the 17413 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 17414 */ 17415 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 17416 @Override 17417 public void setValue(View object, float value) { 17418 object.setScaleX(value); 17419 } 17420 17421 @Override 17422 public Float get(View object) { 17423 return object.getScaleX(); 17424 } 17425 }; 17426 17427 /** 17428 * A Property wrapper around the <code>scaleY</code> functionality handled by the 17429 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 17430 */ 17431 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 17432 @Override 17433 public void setValue(View object, float value) { 17434 object.setScaleY(value); 17435 } 17436 17437 @Override 17438 public Float get(View object) { 17439 return object.getScaleY(); 17440 } 17441 }; 17442 17443 /** 17444 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 17445 * Each MeasureSpec represents a requirement for either the width or the height. 17446 * A MeasureSpec is comprised of a size and a mode. There are three possible 17447 * modes: 17448 * <dl> 17449 * <dt>UNSPECIFIED</dt> 17450 * <dd> 17451 * The parent has not imposed any constraint on the child. It can be whatever size 17452 * it wants. 17453 * </dd> 17454 * 17455 * <dt>EXACTLY</dt> 17456 * <dd> 17457 * The parent has determined an exact size for the child. The child is going to be 17458 * given those bounds regardless of how big it wants to be. 17459 * </dd> 17460 * 17461 * <dt>AT_MOST</dt> 17462 * <dd> 17463 * The child can be as large as it wants up to the specified size. 17464 * </dd> 17465 * </dl> 17466 * 17467 * MeasureSpecs are implemented as ints to reduce object allocation. This class 17468 * is provided to pack and unpack the <size, mode> tuple into the int. 17469 */ 17470 public static class MeasureSpec { 17471 private static final int MODE_SHIFT = 30; 17472 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 17473 17474 /** 17475 * Measure specification mode: The parent has not imposed any constraint 17476 * on the child. It can be whatever size it wants. 17477 */ 17478 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 17479 17480 /** 17481 * Measure specification mode: The parent has determined an exact size 17482 * for the child. The child is going to be given those bounds regardless 17483 * of how big it wants to be. 17484 */ 17485 public static final int EXACTLY = 1 << MODE_SHIFT; 17486 17487 /** 17488 * Measure specification mode: The child can be as large as it wants up 17489 * to the specified size. 17490 */ 17491 public static final int AT_MOST = 2 << MODE_SHIFT; 17492 17493 /** 17494 * Creates a measure specification based on the supplied size and mode. 17495 * 17496 * The mode must always be one of the following: 17497 * <ul> 17498 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 17499 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 17500 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 17501 * </ul> 17502 * 17503 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 17504 * implementation was such that the order of arguments did not matter 17505 * and overflow in either value could impact the resulting MeasureSpec. 17506 * {@link android.widget.RelativeLayout} was affected by this bug. 17507 * Apps targeting API levels greater than 17 will get the fixed, more strict 17508 * behavior.</p> 17509 * 17510 * @param size the size of the measure specification 17511 * @param mode the mode of the measure specification 17512 * @return the measure specification based on size and mode 17513 */ 17514 public static int makeMeasureSpec(int size, int mode) { 17515 if (sUseBrokenMakeMeasureSpec) { 17516 return size + mode; 17517 } else { 17518 return (size & ~MODE_MASK) | (mode & MODE_MASK); 17519 } 17520 } 17521 17522 /** 17523 * Extracts the mode from the supplied measure specification. 17524 * 17525 * @param measureSpec the measure specification to extract the mode from 17526 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 17527 * {@link android.view.View.MeasureSpec#AT_MOST} or 17528 * {@link android.view.View.MeasureSpec#EXACTLY} 17529 */ 17530 public static int getMode(int measureSpec) { 17531 return (measureSpec & MODE_MASK); 17532 } 17533 17534 /** 17535 * Extracts the size from the supplied measure specification. 17536 * 17537 * @param measureSpec the measure specification to extract the size from 17538 * @return the size in pixels defined in the supplied measure specification 17539 */ 17540 public static int getSize(int measureSpec) { 17541 return (measureSpec & ~MODE_MASK); 17542 } 17543 17544 static int adjust(int measureSpec, int delta) { 17545 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 17546 } 17547 17548 /** 17549 * Returns a String representation of the specified measure 17550 * specification. 17551 * 17552 * @param measureSpec the measure specification to convert to a String 17553 * @return a String with the following format: "MeasureSpec: MODE SIZE" 17554 */ 17555 public static String toString(int measureSpec) { 17556 int mode = getMode(measureSpec); 17557 int size = getSize(measureSpec); 17558 17559 StringBuilder sb = new StringBuilder("MeasureSpec: "); 17560 17561 if (mode == UNSPECIFIED) 17562 sb.append("UNSPECIFIED "); 17563 else if (mode == EXACTLY) 17564 sb.append("EXACTLY "); 17565 else if (mode == AT_MOST) 17566 sb.append("AT_MOST "); 17567 else 17568 sb.append(mode).append(" "); 17569 17570 sb.append(size); 17571 return sb.toString(); 17572 } 17573 } 17574 17575 class CheckForLongPress implements Runnable { 17576 17577 private int mOriginalWindowAttachCount; 17578 17579 public void run() { 17580 if (isPressed() && (mParent != null) 17581 && mOriginalWindowAttachCount == mWindowAttachCount) { 17582 if (performLongClick()) { 17583 mHasPerformedLongPress = true; 17584 } 17585 } 17586 } 17587 17588 public void rememberWindowAttachCount() { 17589 mOriginalWindowAttachCount = mWindowAttachCount; 17590 } 17591 } 17592 17593 private final class CheckForTap implements Runnable { 17594 public void run() { 17595 mPrivateFlags &= ~PFLAG_PREPRESSED; 17596 setPressed(true); 17597 checkForLongClick(ViewConfiguration.getTapTimeout()); 17598 } 17599 } 17600 17601 private final class PerformClick implements Runnable { 17602 public void run() { 17603 performClick(); 17604 } 17605 } 17606 17607 /** @hide */ 17608 public void hackTurnOffWindowResizeAnim(boolean off) { 17609 mAttachInfo.mTurnOffWindowResizeAnim = off; 17610 } 17611 17612 /** 17613 * This method returns a ViewPropertyAnimator object, which can be used to animate 17614 * specific properties on this View. 17615 * 17616 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 17617 */ 17618 public ViewPropertyAnimator animate() { 17619 if (mAnimator == null) { 17620 mAnimator = new ViewPropertyAnimator(this); 17621 } 17622 return mAnimator; 17623 } 17624 17625 /** 17626 * Interface definition for a callback to be invoked when a hardware key event is 17627 * dispatched to this view. The callback will be invoked before the key event is 17628 * given to the view. This is only useful for hardware keyboards; a software input 17629 * method has no obligation to trigger this listener. 17630 */ 17631 public interface OnKeyListener { 17632 /** 17633 * Called when a hardware key is dispatched to a view. This allows listeners to 17634 * get a chance to respond before the target view. 17635 * <p>Key presses in software keyboards will generally NOT trigger this method, 17636 * although some may elect to do so in some situations. Do not assume a 17637 * software input method has to be key-based; even if it is, it may use key presses 17638 * in a different way than you expect, so there is no way to reliably catch soft 17639 * input key presses. 17640 * 17641 * @param v The view the key has been dispatched to. 17642 * @param keyCode The code for the physical key that was pressed 17643 * @param event The KeyEvent object containing full information about 17644 * the event. 17645 * @return True if the listener has consumed the event, false otherwise. 17646 */ 17647 boolean onKey(View v, int keyCode, KeyEvent event); 17648 } 17649 17650 /** 17651 * Interface definition for a callback to be invoked when a touch event is 17652 * dispatched to this view. The callback will be invoked before the touch 17653 * event is given to the view. 17654 */ 17655 public interface OnTouchListener { 17656 /** 17657 * Called when a touch event is dispatched to a view. This allows listeners to 17658 * get a chance to respond before the target view. 17659 * 17660 * @param v The view the touch event has been dispatched to. 17661 * @param event The MotionEvent object containing full information about 17662 * the event. 17663 * @return True if the listener has consumed the event, false otherwise. 17664 */ 17665 boolean onTouch(View v, MotionEvent event); 17666 } 17667 17668 /** 17669 * Interface definition for a callback to be invoked when a hover event is 17670 * dispatched to this view. The callback will be invoked before the hover 17671 * event is given to the view. 17672 */ 17673 public interface OnHoverListener { 17674 /** 17675 * Called when a hover event is dispatched to a view. This allows listeners to 17676 * get a chance to respond before the target view. 17677 * 17678 * @param v The view the hover event has been dispatched to. 17679 * @param event The MotionEvent object containing full information about 17680 * the event. 17681 * @return True if the listener has consumed the event, false otherwise. 17682 */ 17683 boolean onHover(View v, MotionEvent event); 17684 } 17685 17686 /** 17687 * Interface definition for a callback to be invoked when a generic motion event is 17688 * dispatched to this view. The callback will be invoked before the generic motion 17689 * event is given to the view. 17690 */ 17691 public interface OnGenericMotionListener { 17692 /** 17693 * Called when a generic motion event is dispatched to a view. This allows listeners to 17694 * get a chance to respond before the target view. 17695 * 17696 * @param v The view the generic motion event has been dispatched to. 17697 * @param event The MotionEvent object containing full information about 17698 * the event. 17699 * @return True if the listener has consumed the event, false otherwise. 17700 */ 17701 boolean onGenericMotion(View v, MotionEvent event); 17702 } 17703 17704 /** 17705 * Interface definition for a callback to be invoked when a view has been clicked and held. 17706 */ 17707 public interface OnLongClickListener { 17708 /** 17709 * Called when a view has been clicked and held. 17710 * 17711 * @param v The view that was clicked and held. 17712 * 17713 * @return true if the callback consumed the long click, false otherwise. 17714 */ 17715 boolean onLongClick(View v); 17716 } 17717 17718 /** 17719 * Interface definition for a callback to be invoked when a drag is being dispatched 17720 * to this view. The callback will be invoked before the hosting view's own 17721 * onDrag(event) method. If the listener wants to fall back to the hosting view's 17722 * onDrag(event) behavior, it should return 'false' from this callback. 17723 * 17724 * <div class="special reference"> 17725 * <h3>Developer Guides</h3> 17726 * <p>For a guide to implementing drag and drop features, read the 17727 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 17728 * </div> 17729 */ 17730 public interface OnDragListener { 17731 /** 17732 * Called when a drag event is dispatched to a view. This allows listeners 17733 * to get a chance to override base View behavior. 17734 * 17735 * @param v The View that received the drag event. 17736 * @param event The {@link android.view.DragEvent} object for the drag event. 17737 * @return {@code true} if the drag event was handled successfully, or {@code false} 17738 * if the drag event was not handled. Note that {@code false} will trigger the View 17739 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 17740 */ 17741 boolean onDrag(View v, DragEvent event); 17742 } 17743 17744 /** 17745 * Interface definition for a callback to be invoked when the focus state of 17746 * a view changed. 17747 */ 17748 public interface OnFocusChangeListener { 17749 /** 17750 * Called when the focus state of a view has changed. 17751 * 17752 * @param v The view whose state has changed. 17753 * @param hasFocus The new focus state of v. 17754 */ 17755 void onFocusChange(View v, boolean hasFocus); 17756 } 17757 17758 /** 17759 * Interface definition for a callback to be invoked when a view is clicked. 17760 */ 17761 public interface OnClickListener { 17762 /** 17763 * Called when a view has been clicked. 17764 * 17765 * @param v The view that was clicked. 17766 */ 17767 void onClick(View v); 17768 } 17769 17770 /** 17771 * Interface definition for a callback to be invoked when the context menu 17772 * for this view is being built. 17773 */ 17774 public interface OnCreateContextMenuListener { 17775 /** 17776 * Called when the context menu for this view is being built. It is not 17777 * safe to hold onto the menu after this method returns. 17778 * 17779 * @param menu The context menu that is being built 17780 * @param v The view for which the context menu is being built 17781 * @param menuInfo Extra information about the item for which the 17782 * context menu should be shown. This information will vary 17783 * depending on the class of v. 17784 */ 17785 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 17786 } 17787 17788 /** 17789 * Interface definition for a callback to be invoked when the status bar changes 17790 * visibility. This reports <strong>global</strong> changes to the system UI 17791 * state, not what the application is requesting. 17792 * 17793 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 17794 */ 17795 public interface OnSystemUiVisibilityChangeListener { 17796 /** 17797 * Called when the status bar changes visibility because of a call to 17798 * {@link View#setSystemUiVisibility(int)}. 17799 * 17800 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 17801 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 17802 * This tells you the <strong>global</strong> state of these UI visibility 17803 * flags, not what your app is currently applying. 17804 */ 17805 public void onSystemUiVisibilityChange(int visibility); 17806 } 17807 17808 /** 17809 * Interface definition for a callback to be invoked when this view is attached 17810 * or detached from its window. 17811 */ 17812 public interface OnAttachStateChangeListener { 17813 /** 17814 * Called when the view is attached to a window. 17815 * @param v The view that was attached 17816 */ 17817 public void onViewAttachedToWindow(View v); 17818 /** 17819 * Called when the view is detached from a window. 17820 * @param v The view that was detached 17821 */ 17822 public void onViewDetachedFromWindow(View v); 17823 } 17824 17825 private final class UnsetPressedState implements Runnable { 17826 public void run() { 17827 setPressed(false); 17828 } 17829 } 17830 17831 /** 17832 * Base class for derived classes that want to save and restore their own 17833 * state in {@link android.view.View#onSaveInstanceState()}. 17834 */ 17835 public static class BaseSavedState extends AbsSavedState { 17836 /** 17837 * Constructor used when reading from a parcel. Reads the state of the superclass. 17838 * 17839 * @param source 17840 */ 17841 public BaseSavedState(Parcel source) { 17842 super(source); 17843 } 17844 17845 /** 17846 * Constructor called by derived classes when creating their SavedState objects 17847 * 17848 * @param superState The state of the superclass of this view 17849 */ 17850 public BaseSavedState(Parcelable superState) { 17851 super(superState); 17852 } 17853 17854 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17855 new Parcelable.Creator<BaseSavedState>() { 17856 public BaseSavedState createFromParcel(Parcel in) { 17857 return new BaseSavedState(in); 17858 } 17859 17860 public BaseSavedState[] newArray(int size) { 17861 return new BaseSavedState[size]; 17862 } 17863 }; 17864 } 17865 17866 /** 17867 * A set of information given to a view when it is attached to its parent 17868 * window. 17869 */ 17870 static class AttachInfo { 17871 interface Callbacks { 17872 void playSoundEffect(int effectId); 17873 boolean performHapticFeedback(int effectId, boolean always); 17874 } 17875 17876 /** 17877 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17878 * to a Handler. This class contains the target (View) to invalidate and 17879 * the coordinates of the dirty rectangle. 17880 * 17881 * For performance purposes, this class also implements a pool of up to 17882 * POOL_LIMIT objects that get reused. This reduces memory allocations 17883 * whenever possible. 17884 */ 17885 static class InvalidateInfo { 17886 private static final int POOL_LIMIT = 10; 17887 17888 private static final SynchronizedPool<InvalidateInfo> sPool = 17889 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 17890 17891 View target; 17892 17893 int left; 17894 int top; 17895 int right; 17896 int bottom; 17897 17898 public static InvalidateInfo obtain() { 17899 InvalidateInfo instance = sPool.acquire(); 17900 return (instance != null) ? instance : new InvalidateInfo(); 17901 } 17902 17903 public void recycle() { 17904 target = null; 17905 sPool.release(this); 17906 } 17907 } 17908 17909 final IWindowSession mSession; 17910 17911 final IWindow mWindow; 17912 17913 final IBinder mWindowToken; 17914 17915 final Display mDisplay; 17916 17917 final Callbacks mRootCallbacks; 17918 17919 HardwareCanvas mHardwareCanvas; 17920 17921 IWindowId mIWindowId; 17922 WindowId mWindowId; 17923 17924 /** 17925 * The top view of the hierarchy. 17926 */ 17927 View mRootView; 17928 17929 IBinder mPanelParentWindowToken; 17930 Surface mSurface; 17931 17932 boolean mHardwareAccelerated; 17933 boolean mHardwareAccelerationRequested; 17934 HardwareRenderer mHardwareRenderer; 17935 17936 boolean mScreenOn; 17937 17938 /** 17939 * Scale factor used by the compatibility mode 17940 */ 17941 float mApplicationScale; 17942 17943 /** 17944 * Indicates whether the application is in compatibility mode 17945 */ 17946 boolean mScalingRequired; 17947 17948 /** 17949 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 17950 */ 17951 boolean mTurnOffWindowResizeAnim; 17952 17953 /** 17954 * Left position of this view's window 17955 */ 17956 int mWindowLeft; 17957 17958 /** 17959 * Top position of this view's window 17960 */ 17961 int mWindowTop; 17962 17963 /** 17964 * Indicates whether views need to use 32-bit drawing caches 17965 */ 17966 boolean mUse32BitDrawingCache; 17967 17968 /** 17969 * For windows that are full-screen but using insets to layout inside 17970 * of the screen areas, these are the current insets to appear inside 17971 * the overscan area of the display. 17972 */ 17973 final Rect mOverscanInsets = new Rect(); 17974 17975 /** 17976 * For windows that are full-screen but using insets to layout inside 17977 * of the screen decorations, these are the current insets for the 17978 * content of the window. 17979 */ 17980 final Rect mContentInsets = new Rect(); 17981 17982 /** 17983 * For windows that are full-screen but using insets to layout inside 17984 * of the screen decorations, these are the current insets for the 17985 * actual visible parts of the window. 17986 */ 17987 final Rect mVisibleInsets = new Rect(); 17988 17989 /** 17990 * The internal insets given by this window. This value is 17991 * supplied by the client (through 17992 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17993 * be given to the window manager when changed to be used in laying 17994 * out windows behind it. 17995 */ 17996 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17997 = new ViewTreeObserver.InternalInsetsInfo(); 17998 17999 /** 18000 * All views in the window's hierarchy that serve as scroll containers, 18001 * used to determine if the window can be resized or must be panned 18002 * to adjust for a soft input area. 18003 */ 18004 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 18005 18006 final KeyEvent.DispatcherState mKeyDispatchState 18007 = new KeyEvent.DispatcherState(); 18008 18009 /** 18010 * Indicates whether the view's window currently has the focus. 18011 */ 18012 boolean mHasWindowFocus; 18013 18014 /** 18015 * The current visibility of the window. 18016 */ 18017 int mWindowVisibility; 18018 18019 /** 18020 * Indicates the time at which drawing started to occur. 18021 */ 18022 long mDrawingTime; 18023 18024 /** 18025 * Indicates whether or not ignoring the DIRTY_MASK flags. 18026 */ 18027 boolean mIgnoreDirtyState; 18028 18029 /** 18030 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 18031 * to avoid clearing that flag prematurely. 18032 */ 18033 boolean mSetIgnoreDirtyState = false; 18034 18035 /** 18036 * Indicates whether the view's window is currently in touch mode. 18037 */ 18038 boolean mInTouchMode; 18039 18040 /** 18041 * Indicates that ViewAncestor should trigger a global layout change 18042 * the next time it performs a traversal 18043 */ 18044 boolean mRecomputeGlobalAttributes; 18045 18046 /** 18047 * Always report new attributes at next traversal. 18048 */ 18049 boolean mForceReportNewAttributes; 18050 18051 /** 18052 * Set during a traveral if any views want to keep the screen on. 18053 */ 18054 boolean mKeepScreenOn; 18055 18056 /** 18057 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 18058 */ 18059 int mSystemUiVisibility; 18060 18061 /** 18062 * Hack to force certain system UI visibility flags to be cleared. 18063 */ 18064 int mDisabledSystemUiVisibility; 18065 18066 /** 18067 * Last global system UI visibility reported by the window manager. 18068 */ 18069 int mGlobalSystemUiVisibility; 18070 18071 /** 18072 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 18073 * attached. 18074 */ 18075 boolean mHasSystemUiListeners; 18076 18077 /** 18078 * Set if the window has requested to extend into the overscan region 18079 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 18080 */ 18081 boolean mOverscanRequested; 18082 18083 /** 18084 * Set if the visibility of any views has changed. 18085 */ 18086 boolean mViewVisibilityChanged; 18087 18088 /** 18089 * Set to true if a view has been scrolled. 18090 */ 18091 boolean mViewScrollChanged; 18092 18093 /** 18094 * Global to the view hierarchy used as a temporary for dealing with 18095 * x/y points in the transparent region computations. 18096 */ 18097 final int[] mTransparentLocation = new int[2]; 18098 18099 /** 18100 * Global to the view hierarchy used as a temporary for dealing with 18101 * x/y points in the ViewGroup.invalidateChild implementation. 18102 */ 18103 final int[] mInvalidateChildLocation = new int[2]; 18104 18105 18106 /** 18107 * Global to the view hierarchy used as a temporary for dealing with 18108 * x/y location when view is transformed. 18109 */ 18110 final float[] mTmpTransformLocation = new float[2]; 18111 18112 /** 18113 * The view tree observer used to dispatch global events like 18114 * layout, pre-draw, touch mode change, etc. 18115 */ 18116 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 18117 18118 /** 18119 * A Canvas used by the view hierarchy to perform bitmap caching. 18120 */ 18121 Canvas mCanvas; 18122 18123 /** 18124 * The view root impl. 18125 */ 18126 final ViewRootImpl mViewRootImpl; 18127 18128 /** 18129 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 18130 * handler can be used to pump events in the UI events queue. 18131 */ 18132 final Handler mHandler; 18133 18134 /** 18135 * Temporary for use in computing invalidate rectangles while 18136 * calling up the hierarchy. 18137 */ 18138 final Rect mTmpInvalRect = new Rect(); 18139 18140 /** 18141 * Temporary for use in computing hit areas with transformed views 18142 */ 18143 final RectF mTmpTransformRect = new RectF(); 18144 18145 /** 18146 * Temporary for use in transforming invalidation rect 18147 */ 18148 final Matrix mTmpMatrix = new Matrix(); 18149 18150 /** 18151 * Temporary for use in transforming invalidation rect 18152 */ 18153 final Transformation mTmpTransformation = new Transformation(); 18154 18155 /** 18156 * Temporary list for use in collecting focusable descendents of a view. 18157 */ 18158 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 18159 18160 /** 18161 * The id of the window for accessibility purposes. 18162 */ 18163 int mAccessibilityWindowId = View.NO_ID; 18164 18165 /** 18166 * Flags related to accessibility processing. 18167 * 18168 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 18169 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 18170 */ 18171 int mAccessibilityFetchFlags; 18172 18173 /** 18174 * The drawable for highlighting accessibility focus. 18175 */ 18176 Drawable mAccessibilityFocusDrawable; 18177 18178 /** 18179 * Show where the margins, bounds and layout bounds are for each view. 18180 */ 18181 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 18182 18183 /** 18184 * Point used to compute visible regions. 18185 */ 18186 final Point mPoint = new Point(); 18187 18188 /** 18189 * Used to track which View originated a requestLayout() call, used when 18190 * requestLayout() is called during layout. 18191 */ 18192 View mViewRequestingLayout; 18193 18194 /** 18195 * Creates a new set of attachment information with the specified 18196 * events handler and thread. 18197 * 18198 * @param handler the events handler the view must use 18199 */ 18200 AttachInfo(IWindowSession session, IWindow window, Display display, 18201 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 18202 mSession = session; 18203 mWindow = window; 18204 mWindowToken = window.asBinder(); 18205 mDisplay = display; 18206 mViewRootImpl = viewRootImpl; 18207 mHandler = handler; 18208 mRootCallbacks = effectPlayer; 18209 } 18210 } 18211 18212 /** 18213 * <p>ScrollabilityCache holds various fields used by a View when scrolling 18214 * is supported. This avoids keeping too many unused fields in most 18215 * instances of View.</p> 18216 */ 18217 private static class ScrollabilityCache implements Runnable { 18218 18219 /** 18220 * Scrollbars are not visible 18221 */ 18222 public static final int OFF = 0; 18223 18224 /** 18225 * Scrollbars are visible 18226 */ 18227 public static final int ON = 1; 18228 18229 /** 18230 * Scrollbars are fading away 18231 */ 18232 public static final int FADING = 2; 18233 18234 public boolean fadeScrollBars; 18235 18236 public int fadingEdgeLength; 18237 public int scrollBarDefaultDelayBeforeFade; 18238 public int scrollBarFadeDuration; 18239 18240 public int scrollBarSize; 18241 public ScrollBarDrawable scrollBar; 18242 public float[] interpolatorValues; 18243 public View host; 18244 18245 public final Paint paint; 18246 public final Matrix matrix; 18247 public Shader shader; 18248 18249 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 18250 18251 private static final float[] OPAQUE = { 255 }; 18252 private static final float[] TRANSPARENT = { 0.0f }; 18253 18254 /** 18255 * When fading should start. This time moves into the future every time 18256 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 18257 */ 18258 public long fadeStartTime; 18259 18260 18261 /** 18262 * The current state of the scrollbars: ON, OFF, or FADING 18263 */ 18264 public int state = OFF; 18265 18266 private int mLastColor; 18267 18268 public ScrollabilityCache(ViewConfiguration configuration, View host) { 18269 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 18270 scrollBarSize = configuration.getScaledScrollBarSize(); 18271 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 18272 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 18273 18274 paint = new Paint(); 18275 matrix = new Matrix(); 18276 // use use a height of 1, and then wack the matrix each time we 18277 // actually use it. 18278 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18279 paint.setShader(shader); 18280 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18281 18282 this.host = host; 18283 } 18284 18285 public void setFadeColor(int color) { 18286 if (color != mLastColor) { 18287 mLastColor = color; 18288 18289 if (color != 0) { 18290 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 18291 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 18292 paint.setShader(shader); 18293 // Restore the default transfer mode (src_over) 18294 paint.setXfermode(null); 18295 } else { 18296 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18297 paint.setShader(shader); 18298 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18299 } 18300 } 18301 } 18302 18303 public void run() { 18304 long now = AnimationUtils.currentAnimationTimeMillis(); 18305 if (now >= fadeStartTime) { 18306 18307 // the animation fades the scrollbars out by changing 18308 // the opacity (alpha) from fully opaque to fully 18309 // transparent 18310 int nextFrame = (int) now; 18311 int framesCount = 0; 18312 18313 Interpolator interpolator = scrollBarInterpolator; 18314 18315 // Start opaque 18316 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 18317 18318 // End transparent 18319 nextFrame += scrollBarFadeDuration; 18320 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 18321 18322 state = FADING; 18323 18324 // Kick off the fade animation 18325 host.invalidate(true); 18326 } 18327 } 18328 } 18329 18330 /** 18331 * Resuable callback for sending 18332 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 18333 */ 18334 private class SendViewScrolledAccessibilityEvent implements Runnable { 18335 public volatile boolean mIsPending; 18336 18337 public void run() { 18338 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 18339 mIsPending = false; 18340 } 18341 } 18342 18343 /** 18344 * <p> 18345 * This class represents a delegate that can be registered in a {@link View} 18346 * to enhance accessibility support via composition rather via inheritance. 18347 * It is specifically targeted to widget developers that extend basic View 18348 * classes i.e. classes in package android.view, that would like their 18349 * applications to be backwards compatible. 18350 * </p> 18351 * <div class="special reference"> 18352 * <h3>Developer Guides</h3> 18353 * <p>For more information about making applications accessible, read the 18354 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 18355 * developer guide.</p> 18356 * </div> 18357 * <p> 18358 * A scenario in which a developer would like to use an accessibility delegate 18359 * is overriding a method introduced in a later API version then the minimal API 18360 * version supported by the application. For example, the method 18361 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 18362 * in API version 4 when the accessibility APIs were first introduced. If a 18363 * developer would like his application to run on API version 4 devices (assuming 18364 * all other APIs used by the application are version 4 or lower) and take advantage 18365 * of this method, instead of overriding the method which would break the application's 18366 * backwards compatibility, he can override the corresponding method in this 18367 * delegate and register the delegate in the target View if the API version of 18368 * the system is high enough i.e. the API version is same or higher to the API 18369 * version that introduced 18370 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 18371 * </p> 18372 * <p> 18373 * Here is an example implementation: 18374 * </p> 18375 * <code><pre><p> 18376 * if (Build.VERSION.SDK_INT >= 14) { 18377 * // If the API version is equal of higher than the version in 18378 * // which onInitializeAccessibilityNodeInfo was introduced we 18379 * // register a delegate with a customized implementation. 18380 * View view = findViewById(R.id.view_id); 18381 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 18382 * public void onInitializeAccessibilityNodeInfo(View host, 18383 * AccessibilityNodeInfo info) { 18384 * // Let the default implementation populate the info. 18385 * super.onInitializeAccessibilityNodeInfo(host, info); 18386 * // Set some other information. 18387 * info.setEnabled(host.isEnabled()); 18388 * } 18389 * }); 18390 * } 18391 * </code></pre></p> 18392 * <p> 18393 * This delegate contains methods that correspond to the accessibility methods 18394 * in View. If a delegate has been specified the implementation in View hands 18395 * off handling to the corresponding method in this delegate. The default 18396 * implementation the delegate methods behaves exactly as the corresponding 18397 * method in View for the case of no accessibility delegate been set. Hence, 18398 * to customize the behavior of a View method, clients can override only the 18399 * corresponding delegate method without altering the behavior of the rest 18400 * accessibility related methods of the host view. 18401 * </p> 18402 */ 18403 public static class AccessibilityDelegate { 18404 18405 /** 18406 * Sends an accessibility event of the given type. If accessibility is not 18407 * enabled this method has no effect. 18408 * <p> 18409 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 18410 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 18411 * been set. 18412 * </p> 18413 * 18414 * @param host The View hosting the delegate. 18415 * @param eventType The type of the event to send. 18416 * 18417 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 18418 */ 18419 public void sendAccessibilityEvent(View host, int eventType) { 18420 host.sendAccessibilityEventInternal(eventType); 18421 } 18422 18423 /** 18424 * Performs the specified accessibility action on the view. For 18425 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 18426 * <p> 18427 * The default implementation behaves as 18428 * {@link View#performAccessibilityAction(int, Bundle) 18429 * View#performAccessibilityAction(int, Bundle)} for the case of 18430 * no accessibility delegate been set. 18431 * </p> 18432 * 18433 * @param action The action to perform. 18434 * @return Whether the action was performed. 18435 * 18436 * @see View#performAccessibilityAction(int, Bundle) 18437 * View#performAccessibilityAction(int, Bundle) 18438 */ 18439 public boolean performAccessibilityAction(View host, int action, Bundle args) { 18440 return host.performAccessibilityActionInternal(action, args); 18441 } 18442 18443 /** 18444 * Sends an accessibility event. This method behaves exactly as 18445 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 18446 * empty {@link AccessibilityEvent} and does not perform a check whether 18447 * accessibility is enabled. 18448 * <p> 18449 * The default implementation behaves as 18450 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18451 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 18452 * the case of no accessibility delegate been set. 18453 * </p> 18454 * 18455 * @param host The View hosting the delegate. 18456 * @param event The event to send. 18457 * 18458 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18459 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18460 */ 18461 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 18462 host.sendAccessibilityEventUncheckedInternal(event); 18463 } 18464 18465 /** 18466 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 18467 * to its children for adding their text content to the event. 18468 * <p> 18469 * The default implementation behaves as 18470 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18471 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 18472 * the case of no accessibility delegate been set. 18473 * </p> 18474 * 18475 * @param host The View hosting the delegate. 18476 * @param event The event. 18477 * @return True if the event population was completed. 18478 * 18479 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18480 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18481 */ 18482 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18483 return host.dispatchPopulateAccessibilityEventInternal(event); 18484 } 18485 18486 /** 18487 * Gives a chance to the host View to populate the accessibility event with its 18488 * text content. 18489 * <p> 18490 * The default implementation behaves as 18491 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 18492 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 18493 * the case of no accessibility delegate been set. 18494 * </p> 18495 * 18496 * @param host The View hosting the delegate. 18497 * @param event The accessibility event which to populate. 18498 * 18499 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 18500 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 18501 */ 18502 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18503 host.onPopulateAccessibilityEventInternal(event); 18504 } 18505 18506 /** 18507 * Initializes an {@link AccessibilityEvent} with information about the 18508 * the host View which is the event source. 18509 * <p> 18510 * The default implementation behaves as 18511 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 18512 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 18513 * the case of no accessibility delegate been set. 18514 * </p> 18515 * 18516 * @param host The View hosting the delegate. 18517 * @param event The event to initialize. 18518 * 18519 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 18520 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 18521 */ 18522 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 18523 host.onInitializeAccessibilityEventInternal(event); 18524 } 18525 18526 /** 18527 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 18528 * <p> 18529 * The default implementation behaves as 18530 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18531 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 18532 * the case of no accessibility delegate been set. 18533 * </p> 18534 * 18535 * @param host The View hosting the delegate. 18536 * @param info The instance to initialize. 18537 * 18538 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18539 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18540 */ 18541 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 18542 host.onInitializeAccessibilityNodeInfoInternal(info); 18543 } 18544 18545 /** 18546 * Called when a child of the host View has requested sending an 18547 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 18548 * to augment the event. 18549 * <p> 18550 * The default implementation behaves as 18551 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18552 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 18553 * the case of no accessibility delegate been set. 18554 * </p> 18555 * 18556 * @param host The View hosting the delegate. 18557 * @param child The child which requests sending the event. 18558 * @param event The event to be sent. 18559 * @return True if the event should be sent 18560 * 18561 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18562 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18563 */ 18564 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 18565 AccessibilityEvent event) { 18566 return host.onRequestSendAccessibilityEventInternal(child, event); 18567 } 18568 18569 /** 18570 * Gets the provider for managing a virtual view hierarchy rooted at this View 18571 * and reported to {@link android.accessibilityservice.AccessibilityService}s 18572 * that explore the window content. 18573 * <p> 18574 * The default implementation behaves as 18575 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 18576 * the case of no accessibility delegate been set. 18577 * </p> 18578 * 18579 * @return The provider. 18580 * 18581 * @see AccessibilityNodeProvider 18582 */ 18583 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 18584 return null; 18585 } 18586 } 18587 18588 private class MatchIdPredicate implements Predicate<View> { 18589 public int mId; 18590 18591 @Override 18592 public boolean apply(View view) { 18593 return (view.mID == mId); 18594 } 18595 } 18596 18597 private class MatchLabelForPredicate implements Predicate<View> { 18598 private int mLabeledId; 18599 18600 @Override 18601 public boolean apply(View view) { 18602 return (view.mLabelForId == mLabeledId); 18603 } 18604 } 18605 18606 /** 18607 * Dump all private flags in readable format, useful for documentation and 18608 * sanity checking. 18609 */ 18610 private static void dumpFlags() { 18611 final HashMap<String, String> found = Maps.newHashMap(); 18612 try { 18613 for (Field field : View.class.getDeclaredFields()) { 18614 final int modifiers = field.getModifiers(); 18615 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 18616 if (field.getType().equals(int.class)) { 18617 final int value = field.getInt(null); 18618 dumpFlag(found, field.getName(), value); 18619 } else if (field.getType().equals(int[].class)) { 18620 final int[] values = (int[]) field.get(null); 18621 for (int i = 0; i < values.length; i++) { 18622 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 18623 } 18624 } 18625 } 18626 } 18627 } catch (IllegalAccessException e) { 18628 throw new RuntimeException(e); 18629 } 18630 18631 final ArrayList<String> keys = Lists.newArrayList(); 18632 keys.addAll(found.keySet()); 18633 Collections.sort(keys); 18634 for (String key : keys) { 18635 Log.d(VIEW_LOG_TAG, found.get(key)); 18636 } 18637 } 18638 18639 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 18640 // Sort flags by prefix, then by bits, always keeping unique keys 18641 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 18642 final int prefix = name.indexOf('_'); 18643 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 18644 final String output = bits + " " + name; 18645 found.put(key, output); 18646 } 18647} 18648