View.java revision 7a46dde1ae56a85fcb5cdac91173424b6355bf3c
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.hardware.display.DisplayManagerGlobal; 43import android.os.Bundle; 44import android.os.Handler; 45import android.os.IBinder; 46import android.os.Parcel; 47import android.os.Parcelable; 48import android.os.RemoteException; 49import android.os.SystemClock; 50import android.os.SystemProperties; 51import android.text.TextUtils; 52import android.util.AttributeSet; 53import android.util.FloatProperty; 54import android.util.Log; 55import android.util.LongSparseLongArray; 56import android.util.Pools.SynchronizedPool; 57import android.util.Property; 58import android.util.SparseArray; 59import android.util.TypedValue; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.AccessibilityIterators.TextSegmentIterator; 62import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 63import android.view.AccessibilityIterators.WordTextSegmentIterator; 64import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 65import android.view.accessibility.AccessibilityEvent; 66import android.view.accessibility.AccessibilityEventSource; 67import android.view.accessibility.AccessibilityManager; 68import android.view.accessibility.AccessibilityNodeInfo; 69import android.view.accessibility.AccessibilityNodeProvider; 70import android.view.animation.Animation; 71import android.view.animation.AnimationUtils; 72import android.view.animation.Transformation; 73import android.view.inputmethod.EditorInfo; 74import android.view.inputmethod.InputConnection; 75import android.view.inputmethod.InputMethodManager; 76import android.view.transition.Scene; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85import com.google.android.collect.Lists; 86import com.google.android.collect.Maps; 87 88import java.lang.ref.WeakReference; 89import java.lang.reflect.Field; 90import java.lang.reflect.InvocationTargetException; 91import java.lang.reflect.Method; 92import java.lang.reflect.Modifier; 93import java.util.ArrayList; 94import java.util.Arrays; 95import java.util.Collections; 96import java.util.HashMap; 97import java.util.Locale; 98import java.util.concurrent.CopyOnWriteArrayList; 99import java.util.concurrent.atomic.AtomicInteger; 100 101/** 102 * <p> 103 * This class represents the basic building block for user interface components. A View 104 * occupies a rectangular area on the screen and is responsible for drawing and 105 * event handling. View is the base class for <em>widgets</em>, which are 106 * used to create interactive UI components (buttons, text fields, etc.). The 107 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 108 * are invisible containers that hold other Views (or other ViewGroups) and define 109 * their layout properties. 110 * </p> 111 * 112 * <div class="special reference"> 113 * <h3>Developer Guides</h3> 114 * <p>For information about using this class to develop your application's user interface, 115 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 116 * </div> 117 * 118 * <a name="Using"></a> 119 * <h3>Using Views</h3> 120 * <p> 121 * All of the views in a window are arranged in a single tree. You can add views 122 * either from code or by specifying a tree of views in one or more XML layout 123 * files. There are many specialized subclasses of views that act as controls or 124 * are capable of displaying text, images, or other content. 125 * </p> 126 * <p> 127 * Once you have created a tree of views, there are typically a few types of 128 * common operations you may wish to perform: 129 * <ul> 130 * <li><strong>Set properties:</strong> for example setting the text of a 131 * {@link android.widget.TextView}. The available properties and the methods 132 * that set them will vary among the different subclasses of views. Note that 133 * properties that are known at build time can be set in the XML layout 134 * files.</li> 135 * <li><strong>Set focus:</strong> The framework will handled moving focus in 136 * response to user input. To force focus to a specific view, call 137 * {@link #requestFocus}.</li> 138 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 139 * that will be notified when something interesting happens to the view. For 140 * example, all views will let you set a listener to be notified when the view 141 * gains or loses focus. You can register such a listener using 142 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 143 * Other view subclasses offer more specialized listeners. For example, a Button 144 * exposes a listener to notify clients when the button is clicked.</li> 145 * <li><strong>Set visibility:</strong> You can hide or show views using 146 * {@link #setVisibility(int)}.</li> 147 * </ul> 148 * </p> 149 * <p><em> 150 * Note: The Android framework is responsible for measuring, laying out and 151 * drawing views. You should not call methods that perform these actions on 152 * views yourself unless you are actually implementing a 153 * {@link android.view.ViewGroup}. 154 * </em></p> 155 * 156 * <a name="Lifecycle"></a> 157 * <h3>Implementing a Custom View</h3> 158 * 159 * <p> 160 * To implement a custom view, you will usually begin by providing overrides for 161 * some of the standard methods that the framework calls on all views. You do 162 * not need to override all of these methods. In fact, you can start by just 163 * overriding {@link #onDraw(android.graphics.Canvas)}. 164 * <table border="2" width="85%" align="center" cellpadding="5"> 165 * <thead> 166 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 167 * </thead> 168 * 169 * <tbody> 170 * <tr> 171 * <td rowspan="2">Creation</td> 172 * <td>Constructors</td> 173 * <td>There is a form of the constructor that are called when the view 174 * is created from code and a form that is called when the view is 175 * inflated from a layout file. The second form should parse and apply 176 * any attributes defined in the layout file. 177 * </td> 178 * </tr> 179 * <tr> 180 * <td><code>{@link #onFinishInflate()}</code></td> 181 * <td>Called after a view and all of its children has been inflated 182 * from XML.</td> 183 * </tr> 184 * 185 * <tr> 186 * <td rowspan="3">Layout</td> 187 * <td><code>{@link #onMeasure(int, int)}</code></td> 188 * <td>Called to determine the size requirements for this view and all 189 * of its children. 190 * </td> 191 * </tr> 192 * <tr> 193 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 194 * <td>Called when this view should assign a size and position to all 195 * of its children. 196 * </td> 197 * </tr> 198 * <tr> 199 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 200 * <td>Called when the size of this view has changed. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td>Drawing</td> 206 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 207 * <td>Called when the view should render its content. 208 * </td> 209 * </tr> 210 * 211 * <tr> 212 * <td rowspan="4">Event processing</td> 213 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 214 * <td>Called when a new hardware key event occurs. 215 * </td> 216 * </tr> 217 * <tr> 218 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 219 * <td>Called when a hardware key up event occurs. 220 * </td> 221 * </tr> 222 * <tr> 223 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 224 * <td>Called when a trackball motion event occurs. 225 * </td> 226 * </tr> 227 * <tr> 228 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 229 * <td>Called when a touch screen motion event occurs. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td rowspan="2">Focus</td> 235 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 236 * <td>Called when the view gains or loses focus. 237 * </td> 238 * </tr> 239 * 240 * <tr> 241 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 242 * <td>Called when the window containing the view gains or loses focus. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td rowspan="3">Attaching</td> 248 * <td><code>{@link #onAttachedToWindow()}</code></td> 249 * <td>Called when the view is attached to a window. 250 * </td> 251 * </tr> 252 * 253 * <tr> 254 * <td><code>{@link #onDetachedFromWindow}</code></td> 255 * <td>Called when the view is detached from its window. 256 * </td> 257 * </tr> 258 * 259 * <tr> 260 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 261 * <td>Called when the visibility of the window containing the view 262 * has changed. 263 * </td> 264 * </tr> 265 * </tbody> 266 * 267 * </table> 268 * </p> 269 * 270 * <a name="IDs"></a> 271 * <h3>IDs</h3> 272 * Views may have an integer id associated with them. These ids are typically 273 * assigned in the layout XML files, and are used to find specific views within 274 * the view tree. A common pattern is to: 275 * <ul> 276 * <li>Define a Button in the layout file and assign it a unique ID. 277 * <pre> 278 * <Button 279 * android:id="@+id/my_button" 280 * android:layout_width="wrap_content" 281 * android:layout_height="wrap_content" 282 * android:text="@string/my_button_text"/> 283 * </pre></li> 284 * <li>From the onCreate method of an Activity, find the Button 285 * <pre class="prettyprint"> 286 * Button myButton = (Button) findViewById(R.id.my_button); 287 * </pre></li> 288 * </ul> 289 * <p> 290 * View IDs need not be unique throughout the tree, but it is good practice to 291 * ensure that they are at least unique within the part of the tree you are 292 * searching. 293 * </p> 294 * 295 * <a name="Position"></a> 296 * <h3>Position</h3> 297 * <p> 298 * The geometry of a view is that of a rectangle. A view has a location, 299 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 300 * two dimensions, expressed as a width and a height. The unit for location 301 * and dimensions is the pixel. 302 * </p> 303 * 304 * <p> 305 * It is possible to retrieve the location of a view by invoking the methods 306 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 307 * coordinate of the rectangle representing the view. The latter returns the 308 * top, or Y, coordinate of the rectangle representing the view. These methods 309 * both return the location of the view relative to its parent. For instance, 310 * when getLeft() returns 20, that means the view is located 20 pixels to the 311 * right of the left edge of its direct parent. 312 * </p> 313 * 314 * <p> 315 * In addition, several convenience methods are offered to avoid unnecessary 316 * computations, namely {@link #getRight()} and {@link #getBottom()}. 317 * These methods return the coordinates of the right and bottom edges of the 318 * rectangle representing the view. For instance, calling {@link #getRight()} 319 * is similar to the following computation: <code>getLeft() + getWidth()</code> 320 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 321 * </p> 322 * 323 * <a name="SizePaddingMargins"></a> 324 * <h3>Size, padding and margins</h3> 325 * <p> 326 * The size of a view is expressed with a width and a height. A view actually 327 * possess two pairs of width and height values. 328 * </p> 329 * 330 * <p> 331 * The first pair is known as <em>measured width</em> and 332 * <em>measured height</em>. These dimensions define how big a view wants to be 333 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 334 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 335 * and {@link #getMeasuredHeight()}. 336 * </p> 337 * 338 * <p> 339 * The second pair is simply known as <em>width</em> and <em>height</em>, or 340 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 341 * dimensions define the actual size of the view on screen, at drawing time and 342 * after layout. These values may, but do not have to, be different from the 343 * measured width and height. The width and height can be obtained by calling 344 * {@link #getWidth()} and {@link #getHeight()}. 345 * </p> 346 * 347 * <p> 348 * To measure its dimensions, a view takes into account its padding. The padding 349 * is expressed in pixels for the left, top, right and bottom parts of the view. 350 * Padding can be used to offset the content of the view by a specific amount of 351 * pixels. For instance, a left padding of 2 will push the view's content by 352 * 2 pixels to the right of the left edge. Padding can be set using the 353 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 354 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 355 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 356 * {@link #getPaddingEnd()}. 357 * </p> 358 * 359 * <p> 360 * Even though a view can define a padding, it does not provide any support for 361 * margins. However, view groups provide such a support. Refer to 362 * {@link android.view.ViewGroup} and 363 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 364 * </p> 365 * 366 * <a name="Layout"></a> 367 * <h3>Layout</h3> 368 * <p> 369 * Layout is a two pass process: a measure pass and a layout pass. The measuring 370 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 371 * of the view tree. Each view pushes dimension specifications down the tree 372 * during the recursion. At the end of the measure pass, every view has stored 373 * its measurements. The second pass happens in 374 * {@link #layout(int,int,int,int)} and is also top-down. During 375 * this pass each parent is responsible for positioning all of its children 376 * using the sizes computed in the measure pass. 377 * </p> 378 * 379 * <p> 380 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 381 * {@link #getMeasuredHeight()} values must be set, along with those for all of 382 * that view's descendants. A view's measured width and measured height values 383 * must respect the constraints imposed by the view's parents. This guarantees 384 * that at the end of the measure pass, all parents accept all of their 385 * children's measurements. A parent view may call measure() more than once on 386 * its children. For example, the parent may measure each child once with 387 * unspecified dimensions to find out how big they want to be, then call 388 * measure() on them again with actual numbers if the sum of all the children's 389 * unconstrained sizes is too big or too small. 390 * </p> 391 * 392 * <p> 393 * The measure pass uses two classes to communicate dimensions. The 394 * {@link MeasureSpec} class is used by views to tell their parents how they 395 * want to be measured and positioned. The base LayoutParams class just 396 * describes how big the view wants to be for both width and height. For each 397 * dimension, it can specify one of: 398 * <ul> 399 * <li> an exact number 400 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 401 * (minus padding) 402 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 403 * enclose its content (plus padding). 404 * </ul> 405 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 406 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 407 * an X and Y value. 408 * </p> 409 * 410 * <p> 411 * MeasureSpecs are used to push requirements down the tree from parent to 412 * child. A MeasureSpec can be in one of three modes: 413 * <ul> 414 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 415 * of a child view. For example, a LinearLayout may call measure() on its child 416 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 417 * tall the child view wants to be given a width of 240 pixels. 418 * <li>EXACTLY: This is used by the parent to impose an exact size on the 419 * child. The child must use this size, and guarantee that all of its 420 * descendants will fit within this size. 421 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 422 * child. The child must gurantee that it and all of its descendants will fit 423 * within this size. 424 * </ul> 425 * </p> 426 * 427 * <p> 428 * To intiate a layout, call {@link #requestLayout}. This method is typically 429 * called by a view on itself when it believes that is can no longer fit within 430 * its current bounds. 431 * </p> 432 * 433 * <a name="Drawing"></a> 434 * <h3>Drawing</h3> 435 * <p> 436 * Drawing is handled by walking the tree and rendering each view that 437 * intersects the invalid region. Because the tree is traversed in-order, 438 * this means that parents will draw before (i.e., behind) their children, with 439 * siblings drawn in the order they appear in the tree. 440 * If you set a background drawable for a View, then the View will draw it for you 441 * before calling back to its <code>onDraw()</code> method. 442 * </p> 443 * 444 * <p> 445 * Note that the framework will not draw views that are not in the invalid region. 446 * </p> 447 * 448 * <p> 449 * To force a view to draw, call {@link #invalidate()}. 450 * </p> 451 * 452 * <a name="EventHandlingThreading"></a> 453 * <h3>Event Handling and Threading</h3> 454 * <p> 455 * The basic cycle of a view is as follows: 456 * <ol> 457 * <li>An event comes in and is dispatched to the appropriate view. The view 458 * handles the event and notifies any listeners.</li> 459 * <li>If in the course of processing the event, the view's bounds may need 460 * to be changed, the view will call {@link #requestLayout()}.</li> 461 * <li>Similarly, if in the course of processing the event the view's appearance 462 * may need to be changed, the view will call {@link #invalidate()}.</li> 463 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 464 * the framework will take care of measuring, laying out, and drawing the tree 465 * as appropriate.</li> 466 * </ol> 467 * </p> 468 * 469 * <p><em>Note: The entire view tree is single threaded. You must always be on 470 * the UI thread when calling any method on any view.</em> 471 * If you are doing work on other threads and want to update the state of a view 472 * from that thread, you should use a {@link Handler}. 473 * </p> 474 * 475 * <a name="FocusHandling"></a> 476 * <h3>Focus Handling</h3> 477 * <p> 478 * The framework will handle routine focus movement in response to user input. 479 * This includes changing the focus as views are removed or hidden, or as new 480 * views become available. Views indicate their willingness to take focus 481 * through the {@link #isFocusable} method. To change whether a view can take 482 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 483 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 484 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 485 * </p> 486 * <p> 487 * Focus movement is based on an algorithm which finds the nearest neighbor in a 488 * given direction. In rare cases, the default algorithm may not match the 489 * intended behavior of the developer. In these situations, you can provide 490 * explicit overrides by using these XML attributes in the layout file: 491 * <pre> 492 * nextFocusDown 493 * nextFocusLeft 494 * nextFocusRight 495 * nextFocusUp 496 * </pre> 497 * </p> 498 * 499 * 500 * <p> 501 * To get a particular view to take focus, call {@link #requestFocus()}. 502 * </p> 503 * 504 * <a name="TouchMode"></a> 505 * <h3>Touch Mode</h3> 506 * <p> 507 * When a user is navigating a user interface via directional keys such as a D-pad, it is 508 * necessary to give focus to actionable items such as buttons so the user can see 509 * what will take input. If the device has touch capabilities, however, and the user 510 * begins interacting with the interface by touching it, it is no longer necessary to 511 * always highlight, or give focus to, a particular view. This motivates a mode 512 * for interaction named 'touch mode'. 513 * </p> 514 * <p> 515 * For a touch capable device, once the user touches the screen, the device 516 * will enter touch mode. From this point onward, only views for which 517 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 518 * Other views that are touchable, like buttons, will not take focus when touched; they will 519 * only fire the on click listeners. 520 * </p> 521 * <p> 522 * Any time a user hits a directional key, such as a D-pad direction, the view device will 523 * exit touch mode, and find a view to take focus, so that the user may resume interacting 524 * with the user interface without touching the screen again. 525 * </p> 526 * <p> 527 * The touch mode state is maintained across {@link android.app.Activity}s. Call 528 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 529 * </p> 530 * 531 * <a name="Scrolling"></a> 532 * <h3>Scrolling</h3> 533 * <p> 534 * The framework provides basic support for views that wish to internally 535 * scroll their content. This includes keeping track of the X and Y scroll 536 * offset as well as mechanisms for drawing scrollbars. See 537 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 538 * {@link #awakenScrollBars()} for more details. 539 * </p> 540 * 541 * <a name="Tags"></a> 542 * <h3>Tags</h3> 543 * <p> 544 * Unlike IDs, tags are not used to identify views. Tags are essentially an 545 * extra piece of information that can be associated with a view. They are most 546 * often used as a convenience to store data related to views in the views 547 * themselves rather than by putting them in a separate structure. 548 * </p> 549 * 550 * <a name="Properties"></a> 551 * <h3>Properties</h3> 552 * <p> 553 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 554 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 555 * available both in the {@link Property} form as well as in similarly-named setter/getter 556 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 557 * be used to set persistent state associated with these rendering-related properties on the view. 558 * The properties and methods can also be used in conjunction with 559 * {@link android.animation.Animator Animator}-based animations, described more in the 560 * <a href="#Animation">Animation</a> section. 561 * </p> 562 * 563 * <a name="Animation"></a> 564 * <h3>Animation</h3> 565 * <p> 566 * Starting with Android 3.0, the preferred way of animating views is to use the 567 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 568 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 569 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 570 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 571 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 572 * makes animating these View properties particularly easy and efficient. 573 * </p> 574 * <p> 575 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 576 * You can attach an {@link Animation} object to a view using 577 * {@link #setAnimation(Animation)} or 578 * {@link #startAnimation(Animation)}. The animation can alter the scale, 579 * rotation, translation and alpha of a view over time. If the animation is 580 * attached to a view that has children, the animation will affect the entire 581 * subtree rooted by that node. When an animation is started, the framework will 582 * take care of redrawing the appropriate views until the animation completes. 583 * </p> 584 * 585 * <a name="Security"></a> 586 * <h3>Security</h3> 587 * <p> 588 * Sometimes it is essential that an application be able to verify that an action 589 * is being performed with the full knowledge and consent of the user, such as 590 * granting a permission request, making a purchase or clicking on an advertisement. 591 * Unfortunately, a malicious application could try to spoof the user into 592 * performing these actions, unaware, by concealing the intended purpose of the view. 593 * As a remedy, the framework offers a touch filtering mechanism that can be used to 594 * improve the security of views that provide access to sensitive functionality. 595 * </p><p> 596 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 597 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 598 * will discard touches that are received whenever the view's window is obscured by 599 * another visible window. As a result, the view will not receive touches whenever a 600 * toast, dialog or other window appears above the view's window. 601 * </p><p> 602 * For more fine-grained control over security, consider overriding the 603 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 604 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 605 * </p> 606 * 607 * @attr ref android.R.styleable#View_alpha 608 * @attr ref android.R.styleable#View_background 609 * @attr ref android.R.styleable#View_clickable 610 * @attr ref android.R.styleable#View_contentDescription 611 * @attr ref android.R.styleable#View_drawingCacheQuality 612 * @attr ref android.R.styleable#View_duplicateParentState 613 * @attr ref android.R.styleable#View_id 614 * @attr ref android.R.styleable#View_requiresFadingEdge 615 * @attr ref android.R.styleable#View_fadeScrollbars 616 * @attr ref android.R.styleable#View_fadingEdgeLength 617 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 618 * @attr ref android.R.styleable#View_fitsSystemWindows 619 * @attr ref android.R.styleable#View_isScrollContainer 620 * @attr ref android.R.styleable#View_focusable 621 * @attr ref android.R.styleable#View_focusableInTouchMode 622 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 623 * @attr ref android.R.styleable#View_keepScreenOn 624 * @attr ref android.R.styleable#View_layerType 625 * @attr ref android.R.styleable#View_layoutDirection 626 * @attr ref android.R.styleable#View_longClickable 627 * @attr ref android.R.styleable#View_minHeight 628 * @attr ref android.R.styleable#View_minWidth 629 * @attr ref android.R.styleable#View_nextFocusDown 630 * @attr ref android.R.styleable#View_nextFocusLeft 631 * @attr ref android.R.styleable#View_nextFocusRight 632 * @attr ref android.R.styleable#View_nextFocusUp 633 * @attr ref android.R.styleable#View_onClick 634 * @attr ref android.R.styleable#View_padding 635 * @attr ref android.R.styleable#View_paddingBottom 636 * @attr ref android.R.styleable#View_paddingLeft 637 * @attr ref android.R.styleable#View_paddingRight 638 * @attr ref android.R.styleable#View_paddingTop 639 * @attr ref android.R.styleable#View_paddingStart 640 * @attr ref android.R.styleable#View_paddingEnd 641 * @attr ref android.R.styleable#View_saveEnabled 642 * @attr ref android.R.styleable#View_rotation 643 * @attr ref android.R.styleable#View_rotationX 644 * @attr ref android.R.styleable#View_rotationY 645 * @attr ref android.R.styleable#View_scaleX 646 * @attr ref android.R.styleable#View_scaleY 647 * @attr ref android.R.styleable#View_scrollX 648 * @attr ref android.R.styleable#View_scrollY 649 * @attr ref android.R.styleable#View_scrollbarSize 650 * @attr ref android.R.styleable#View_scrollbarStyle 651 * @attr ref android.R.styleable#View_scrollbars 652 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 653 * @attr ref android.R.styleable#View_scrollbarFadeDuration 654 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 655 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 656 * @attr ref android.R.styleable#View_scrollbarThumbVertical 657 * @attr ref android.R.styleable#View_scrollbarTrackVertical 658 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 659 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 660 * @attr ref android.R.styleable#View_soundEffectsEnabled 661 * @attr ref android.R.styleable#View_tag 662 * @attr ref android.R.styleable#View_textAlignment 663 * @attr ref android.R.styleable#View_textDirection 664 * @attr ref android.R.styleable#View_transformPivotX 665 * @attr ref android.R.styleable#View_transformPivotY 666 * @attr ref android.R.styleable#View_translationX 667 * @attr ref android.R.styleable#View_translationY 668 * @attr ref android.R.styleable#View_visibility 669 * 670 * @see android.view.ViewGroup 671 */ 672public class View implements Drawable.Callback, KeyEvent.Callback, 673 AccessibilityEventSource { 674 private static final boolean DBG = false; 675 676 /** 677 * The logging tag used by this class with android.util.Log. 678 */ 679 protected static final String VIEW_LOG_TAG = "View"; 680 681 /** 682 * When set to true, apps will draw debugging information about their layouts. 683 * 684 * @hide 685 */ 686 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 687 688 /** 689 * Used to mark a View that has no ID. 690 */ 691 public static final int NO_ID = -1; 692 693 private static boolean sUseBrokenMakeMeasureSpec = false; 694 695 /** 696 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 697 * calling setFlags. 698 */ 699 private static final int NOT_FOCUSABLE = 0x00000000; 700 701 /** 702 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 703 * setFlags. 704 */ 705 private static final int FOCUSABLE = 0x00000001; 706 707 /** 708 * Mask for use with setFlags indicating bits used for focus. 709 */ 710 private static final int FOCUSABLE_MASK = 0x00000001; 711 712 /** 713 * This view will adjust its padding to fit sytem windows (e.g. status bar) 714 */ 715 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 716 717 /** 718 * This view is visible. 719 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 720 * android:visibility}. 721 */ 722 public static final int VISIBLE = 0x00000000; 723 724 /** 725 * This view is invisible, but it still takes up space for layout purposes. 726 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 727 * android:visibility}. 728 */ 729 public static final int INVISIBLE = 0x00000004; 730 731 /** 732 * This view is invisible, and it doesn't take any space for layout 733 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 734 * android:visibility}. 735 */ 736 public static final int GONE = 0x00000008; 737 738 /** 739 * Mask for use with setFlags indicating bits used for visibility. 740 * {@hide} 741 */ 742 static final int VISIBILITY_MASK = 0x0000000C; 743 744 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 745 746 /** 747 * This view is enabled. Interpretation varies by subclass. 748 * Use with ENABLED_MASK when calling setFlags. 749 * {@hide} 750 */ 751 static final int ENABLED = 0x00000000; 752 753 /** 754 * This view is disabled. Interpretation varies by subclass. 755 * Use with ENABLED_MASK when calling setFlags. 756 * {@hide} 757 */ 758 static final int DISABLED = 0x00000020; 759 760 /** 761 * Mask for use with setFlags indicating bits used for indicating whether 762 * this view is enabled 763 * {@hide} 764 */ 765 static final int ENABLED_MASK = 0x00000020; 766 767 /** 768 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 769 * called and further optimizations will be performed. It is okay to have 770 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 771 * {@hide} 772 */ 773 static final int WILL_NOT_DRAW = 0x00000080; 774 775 /** 776 * Mask for use with setFlags indicating bits used for indicating whether 777 * this view is will draw 778 * {@hide} 779 */ 780 static final int DRAW_MASK = 0x00000080; 781 782 /** 783 * <p>This view doesn't show scrollbars.</p> 784 * {@hide} 785 */ 786 static final int SCROLLBARS_NONE = 0x00000000; 787 788 /** 789 * <p>This view shows horizontal scrollbars.</p> 790 * {@hide} 791 */ 792 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 793 794 /** 795 * <p>This view shows vertical scrollbars.</p> 796 * {@hide} 797 */ 798 static final int SCROLLBARS_VERTICAL = 0x00000200; 799 800 /** 801 * <p>Mask for use with setFlags indicating bits used for indicating which 802 * scrollbars are enabled.</p> 803 * {@hide} 804 */ 805 static final int SCROLLBARS_MASK = 0x00000300; 806 807 /** 808 * Indicates that the view should filter touches when its window is obscured. 809 * Refer to the class comments for more information about this security feature. 810 * {@hide} 811 */ 812 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 813 814 /** 815 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 816 * that they are optional and should be skipped if the window has 817 * requested system UI flags that ignore those insets for layout. 818 */ 819 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 820 821 /** 822 * <p>This view doesn't show fading edges.</p> 823 * {@hide} 824 */ 825 static final int FADING_EDGE_NONE = 0x00000000; 826 827 /** 828 * <p>This view shows horizontal fading edges.</p> 829 * {@hide} 830 */ 831 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 832 833 /** 834 * <p>This view shows vertical fading edges.</p> 835 * {@hide} 836 */ 837 static final int FADING_EDGE_VERTICAL = 0x00002000; 838 839 /** 840 * <p>Mask for use with setFlags indicating bits used for indicating which 841 * fading edges are enabled.</p> 842 * {@hide} 843 */ 844 static final int FADING_EDGE_MASK = 0x00003000; 845 846 /** 847 * <p>Indicates this view can be clicked. When clickable, a View reacts 848 * to clicks by notifying the OnClickListener.<p> 849 * {@hide} 850 */ 851 static final int CLICKABLE = 0x00004000; 852 853 /** 854 * <p>Indicates this view is caching its drawing into a bitmap.</p> 855 * {@hide} 856 */ 857 static final int DRAWING_CACHE_ENABLED = 0x00008000; 858 859 /** 860 * <p>Indicates that no icicle should be saved for this view.<p> 861 * {@hide} 862 */ 863 static final int SAVE_DISABLED = 0x000010000; 864 865 /** 866 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 867 * property.</p> 868 * {@hide} 869 */ 870 static final int SAVE_DISABLED_MASK = 0x000010000; 871 872 /** 873 * <p>Indicates that no drawing cache should ever be created for this view.<p> 874 * {@hide} 875 */ 876 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 877 878 /** 879 * <p>Indicates this view can take / keep focus when int touch mode.</p> 880 * {@hide} 881 */ 882 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 883 884 /** 885 * <p>Enables low quality mode for the drawing cache.</p> 886 */ 887 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 888 889 /** 890 * <p>Enables high quality mode for the drawing cache.</p> 891 */ 892 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 893 894 /** 895 * <p>Enables automatic quality mode for the drawing cache.</p> 896 */ 897 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 898 899 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 900 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 901 }; 902 903 /** 904 * <p>Mask for use with setFlags indicating bits used for the cache 905 * quality property.</p> 906 * {@hide} 907 */ 908 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 909 910 /** 911 * <p> 912 * Indicates this view can be long clicked. When long clickable, a View 913 * reacts to long clicks by notifying the OnLongClickListener or showing a 914 * context menu. 915 * </p> 916 * {@hide} 917 */ 918 static final int LONG_CLICKABLE = 0x00200000; 919 920 /** 921 * <p>Indicates that this view gets its drawable states from its direct parent 922 * and ignores its original internal states.</p> 923 * 924 * @hide 925 */ 926 static final int DUPLICATE_PARENT_STATE = 0x00400000; 927 928 /** 929 * The scrollbar style to display the scrollbars inside the content area, 930 * without increasing the padding. The scrollbars will be overlaid with 931 * translucency on the view's content. 932 */ 933 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 934 935 /** 936 * The scrollbar style to display the scrollbars inside the padded area, 937 * increasing the padding of the view. The scrollbars will not overlap the 938 * content area of the view. 939 */ 940 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 941 942 /** 943 * The scrollbar style to display the scrollbars at the edge of the view, 944 * without increasing the padding. The scrollbars will be overlaid with 945 * translucency. 946 */ 947 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 948 949 /** 950 * The scrollbar style to display the scrollbars at the edge of the view, 951 * increasing the padding of the view. The scrollbars will only overlap the 952 * background, if any. 953 */ 954 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 955 956 /** 957 * Mask to check if the scrollbar style is overlay or inset. 958 * {@hide} 959 */ 960 static final int SCROLLBARS_INSET_MASK = 0x01000000; 961 962 /** 963 * Mask to check if the scrollbar style is inside or outside. 964 * {@hide} 965 */ 966 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 967 968 /** 969 * Mask for scrollbar style. 970 * {@hide} 971 */ 972 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 973 974 /** 975 * View flag indicating that the screen should remain on while the 976 * window containing this view is visible to the user. This effectively 977 * takes care of automatically setting the WindowManager's 978 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 979 */ 980 public static final int KEEP_SCREEN_ON = 0x04000000; 981 982 /** 983 * View flag indicating whether this view should have sound effects enabled 984 * for events such as clicking and touching. 985 */ 986 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 987 988 /** 989 * View flag indicating whether this view should have haptic feedback 990 * enabled for events such as long presses. 991 */ 992 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 993 994 /** 995 * <p>Indicates that the view hierarchy should stop saving state when 996 * it reaches this view. If state saving is initiated immediately at 997 * the view, it will be allowed. 998 * {@hide} 999 */ 1000 static final int PARENT_SAVE_DISABLED = 0x20000000; 1001 1002 /** 1003 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1004 * {@hide} 1005 */ 1006 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1007 1008 /** 1009 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1010 * should add all focusable Views regardless if they are focusable in touch mode. 1011 */ 1012 public static final int FOCUSABLES_ALL = 0x00000000; 1013 1014 /** 1015 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1016 * should add only Views focusable in touch mode. 1017 */ 1018 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1019 1020 /** 1021 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1022 * item. 1023 */ 1024 public static final int FOCUS_BACKWARD = 0x00000001; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1028 * item. 1029 */ 1030 public static final int FOCUS_FORWARD = 0x00000002; 1031 1032 /** 1033 * Use with {@link #focusSearch(int)}. Move focus to the left. 1034 */ 1035 public static final int FOCUS_LEFT = 0x00000011; 1036 1037 /** 1038 * Use with {@link #focusSearch(int)}. Move focus up. 1039 */ 1040 public static final int FOCUS_UP = 0x00000021; 1041 1042 /** 1043 * Use with {@link #focusSearch(int)}. Move focus to the right. 1044 */ 1045 public static final int FOCUS_RIGHT = 0x00000042; 1046 1047 /** 1048 * Use with {@link #focusSearch(int)}. Move focus down. 1049 */ 1050 public static final int FOCUS_DOWN = 0x00000082; 1051 1052 /** 1053 * Bits of {@link #getMeasuredWidthAndState()} and 1054 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1055 */ 1056 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1057 1058 /** 1059 * Bits of {@link #getMeasuredWidthAndState()} and 1060 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1061 */ 1062 public static final int MEASURED_STATE_MASK = 0xff000000; 1063 1064 /** 1065 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1066 * for functions that combine both width and height into a single int, 1067 * such as {@link #getMeasuredState()} and the childState argument of 1068 * {@link #resolveSizeAndState(int, int, int)}. 1069 */ 1070 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1071 1072 /** 1073 * Bit of {@link #getMeasuredWidthAndState()} and 1074 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1075 * is smaller that the space the view would like to have. 1076 */ 1077 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1078 1079 /** 1080 * Base View state sets 1081 */ 1082 // Singles 1083 /** 1084 * Indicates the view has no states set. States are used with 1085 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1086 * view depending on its state. 1087 * 1088 * @see android.graphics.drawable.Drawable 1089 * @see #getDrawableState() 1090 */ 1091 protected static final int[] EMPTY_STATE_SET; 1092 /** 1093 * Indicates the view is enabled. States are used with 1094 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1095 * view depending on its state. 1096 * 1097 * @see android.graphics.drawable.Drawable 1098 * @see #getDrawableState() 1099 */ 1100 protected static final int[] ENABLED_STATE_SET; 1101 /** 1102 * Indicates the view is focused. States are used with 1103 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1104 * view depending on its state. 1105 * 1106 * @see android.graphics.drawable.Drawable 1107 * @see #getDrawableState() 1108 */ 1109 protected static final int[] FOCUSED_STATE_SET; 1110 /** 1111 * Indicates the view is selected. States are used with 1112 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1113 * view depending on its state. 1114 * 1115 * @see android.graphics.drawable.Drawable 1116 * @see #getDrawableState() 1117 */ 1118 protected static final int[] SELECTED_STATE_SET; 1119 /** 1120 * Indicates the view is pressed. States are used with 1121 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1122 * view depending on its state. 1123 * 1124 * @see android.graphics.drawable.Drawable 1125 * @see #getDrawableState() 1126 */ 1127 protected static final int[] PRESSED_STATE_SET; 1128 /** 1129 * Indicates the view's window has focus. States are used with 1130 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1131 * view depending on its state. 1132 * 1133 * @see android.graphics.drawable.Drawable 1134 * @see #getDrawableState() 1135 */ 1136 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1137 // Doubles 1138 /** 1139 * Indicates the view is enabled and has the focus. 1140 * 1141 * @see #ENABLED_STATE_SET 1142 * @see #FOCUSED_STATE_SET 1143 */ 1144 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1145 /** 1146 * Indicates the view is enabled and selected. 1147 * 1148 * @see #ENABLED_STATE_SET 1149 * @see #SELECTED_STATE_SET 1150 */ 1151 protected static final int[] ENABLED_SELECTED_STATE_SET; 1152 /** 1153 * Indicates the view is enabled and that its window has focus. 1154 * 1155 * @see #ENABLED_STATE_SET 1156 * @see #WINDOW_FOCUSED_STATE_SET 1157 */ 1158 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1159 /** 1160 * Indicates the view is focused and selected. 1161 * 1162 * @see #FOCUSED_STATE_SET 1163 * @see #SELECTED_STATE_SET 1164 */ 1165 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1166 /** 1167 * Indicates the view has the focus and that its window has the focus. 1168 * 1169 * @see #FOCUSED_STATE_SET 1170 * @see #WINDOW_FOCUSED_STATE_SET 1171 */ 1172 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1173 /** 1174 * Indicates the view is selected and that its window has the focus. 1175 * 1176 * @see #SELECTED_STATE_SET 1177 * @see #WINDOW_FOCUSED_STATE_SET 1178 */ 1179 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1180 // Triples 1181 /** 1182 * Indicates the view is enabled, focused and selected. 1183 * 1184 * @see #ENABLED_STATE_SET 1185 * @see #FOCUSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 */ 1188 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1189 /** 1190 * Indicates the view is enabled, focused and its window has the focus. 1191 * 1192 * @see #ENABLED_STATE_SET 1193 * @see #FOCUSED_STATE_SET 1194 * @see #WINDOW_FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is enabled, selected and its window has the focus. 1199 * 1200 * @see #ENABLED_STATE_SET 1201 * @see #SELECTED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is focused, selected and its window has the focus. 1207 * 1208 * @see #FOCUSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #WINDOW_FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1213 /** 1214 * Indicates the view is enabled, focused, selected and its window 1215 * has the focus. 1216 * 1217 * @see #ENABLED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 * @see #SELECTED_STATE_SET 1220 * @see #WINDOW_FOCUSED_STATE_SET 1221 */ 1222 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1223 /** 1224 * Indicates the view is pressed and its window has the focus. 1225 * 1226 * @see #PRESSED_STATE_SET 1227 * @see #WINDOW_FOCUSED_STATE_SET 1228 */ 1229 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1230 /** 1231 * Indicates the view is pressed and selected. 1232 * 1233 * @see #PRESSED_STATE_SET 1234 * @see #SELECTED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_SELECTED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, selected and its window has the focus. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #SELECTED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed and focused. 1247 * 1248 * @see #PRESSED_STATE_SET 1249 * @see #FOCUSED_STATE_SET 1250 */ 1251 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1252 /** 1253 * Indicates the view is pressed, focused and its window has the focus. 1254 * 1255 * @see #PRESSED_STATE_SET 1256 * @see #FOCUSED_STATE_SET 1257 * @see #WINDOW_FOCUSED_STATE_SET 1258 */ 1259 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1260 /** 1261 * Indicates the view is pressed, focused and selected. 1262 * 1263 * @see #PRESSED_STATE_SET 1264 * @see #SELECTED_STATE_SET 1265 * @see #FOCUSED_STATE_SET 1266 */ 1267 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1268 /** 1269 * Indicates the view is pressed, focused, selected and its window has the focus. 1270 * 1271 * @see #PRESSED_STATE_SET 1272 * @see #FOCUSED_STATE_SET 1273 * @see #SELECTED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed and enabled. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #ENABLED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_ENABLED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, enabled and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #ENABLED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed, enabled and selected. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #ENABLED_STATE_SET 1297 * @see #SELECTED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, enabled, selected and its window has the 1302 * focus. 1303 * 1304 * @see #PRESSED_STATE_SET 1305 * @see #ENABLED_STATE_SET 1306 * @see #SELECTED_STATE_SET 1307 * @see #WINDOW_FOCUSED_STATE_SET 1308 */ 1309 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1310 /** 1311 * Indicates the view is pressed, enabled and focused. 1312 * 1313 * @see #PRESSED_STATE_SET 1314 * @see #ENABLED_STATE_SET 1315 * @see #FOCUSED_STATE_SET 1316 */ 1317 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1318 /** 1319 * Indicates the view is pressed, enabled, focused and its window has the 1320 * focus. 1321 * 1322 * @see #PRESSED_STATE_SET 1323 * @see #ENABLED_STATE_SET 1324 * @see #FOCUSED_STATE_SET 1325 * @see #WINDOW_FOCUSED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, enabled, focused and selected. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #ENABLED_STATE_SET 1333 * @see #SELECTED_STATE_SET 1334 * @see #FOCUSED_STATE_SET 1335 */ 1336 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1337 /** 1338 * Indicates the view is pressed, enabled, focused, selected and its window 1339 * has the focus. 1340 * 1341 * @see #PRESSED_STATE_SET 1342 * @see #ENABLED_STATE_SET 1343 * @see #SELECTED_STATE_SET 1344 * @see #FOCUSED_STATE_SET 1345 * @see #WINDOW_FOCUSED_STATE_SET 1346 */ 1347 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1348 1349 /** 1350 * The order here is very important to {@link #getDrawableState()} 1351 */ 1352 private static final int[][] VIEW_STATE_SETS; 1353 1354 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1355 static final int VIEW_STATE_SELECTED = 1 << 1; 1356 static final int VIEW_STATE_FOCUSED = 1 << 2; 1357 static final int VIEW_STATE_ENABLED = 1 << 3; 1358 static final int VIEW_STATE_PRESSED = 1 << 4; 1359 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1360 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1361 static final int VIEW_STATE_HOVERED = 1 << 7; 1362 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1363 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1364 1365 static final int[] VIEW_STATE_IDS = new int[] { 1366 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1367 R.attr.state_selected, VIEW_STATE_SELECTED, 1368 R.attr.state_focused, VIEW_STATE_FOCUSED, 1369 R.attr.state_enabled, VIEW_STATE_ENABLED, 1370 R.attr.state_pressed, VIEW_STATE_PRESSED, 1371 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1372 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1373 R.attr.state_hovered, VIEW_STATE_HOVERED, 1374 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1375 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1376 }; 1377 1378 static { 1379 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1380 throw new IllegalStateException( 1381 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1382 } 1383 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1384 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1385 int viewState = R.styleable.ViewDrawableStates[i]; 1386 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1387 if (VIEW_STATE_IDS[j] == viewState) { 1388 orderedIds[i * 2] = viewState; 1389 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1390 } 1391 } 1392 } 1393 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1394 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1395 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1396 int numBits = Integer.bitCount(i); 1397 int[] set = new int[numBits]; 1398 int pos = 0; 1399 for (int j = 0; j < orderedIds.length; j += 2) { 1400 if ((i & orderedIds[j+1]) != 0) { 1401 set[pos++] = orderedIds[j]; 1402 } 1403 } 1404 VIEW_STATE_SETS[i] = set; 1405 } 1406 1407 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1408 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1409 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1410 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1412 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1413 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1415 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1417 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1419 | VIEW_STATE_FOCUSED]; 1420 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1421 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1423 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1425 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1427 | VIEW_STATE_ENABLED]; 1428 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1429 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1430 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1431 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1432 | VIEW_STATE_ENABLED]; 1433 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1434 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1435 | VIEW_STATE_ENABLED]; 1436 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1437 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1438 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1439 1440 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1441 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1443 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1445 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1447 | VIEW_STATE_PRESSED]; 1448 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1449 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1450 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1452 | VIEW_STATE_PRESSED]; 1453 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1455 | VIEW_STATE_PRESSED]; 1456 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1457 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1458 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1459 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1461 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1463 | VIEW_STATE_PRESSED]; 1464 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1466 | VIEW_STATE_PRESSED]; 1467 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1468 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1469 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1470 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1471 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1472 | VIEW_STATE_PRESSED]; 1473 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1475 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1476 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1477 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1478 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1479 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1481 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1482 | VIEW_STATE_PRESSED]; 1483 } 1484 1485 /** 1486 * Accessibility event types that are dispatched for text population. 1487 */ 1488 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1489 AccessibilityEvent.TYPE_VIEW_CLICKED 1490 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1491 | AccessibilityEvent.TYPE_VIEW_SELECTED 1492 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1493 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1494 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1495 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1496 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1497 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1498 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1499 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1500 1501 /** 1502 * Temporary Rect currently for use in setBackground(). This will probably 1503 * be extended in the future to hold our own class with more than just 1504 * a Rect. :) 1505 */ 1506 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1507 1508 /** 1509 * Map used to store views' tags. 1510 */ 1511 private SparseArray<Object> mKeyedTags; 1512 1513 /** 1514 * The next available accessibility id. 1515 */ 1516 private static int sNextAccessibilityViewId; 1517 1518 /** 1519 * The animation currently associated with this view. 1520 * @hide 1521 */ 1522 protected Animation mCurrentAnimation = null; 1523 1524 /** 1525 * Width as measured during measure pass. 1526 * {@hide} 1527 */ 1528 @ViewDebug.ExportedProperty(category = "measurement") 1529 int mMeasuredWidth; 1530 1531 /** 1532 * Height as measured during measure pass. 1533 * {@hide} 1534 */ 1535 @ViewDebug.ExportedProperty(category = "measurement") 1536 int mMeasuredHeight; 1537 1538 /** 1539 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1540 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1541 * its display list. This flag, used only when hw accelerated, allows us to clear the 1542 * flag while retaining this information until it's needed (at getDisplayList() time and 1543 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1544 * 1545 * {@hide} 1546 */ 1547 boolean mRecreateDisplayList = false; 1548 1549 /** 1550 * The view's identifier. 1551 * {@hide} 1552 * 1553 * @see #setId(int) 1554 * @see #getId() 1555 */ 1556 @ViewDebug.ExportedProperty(resolveId = true) 1557 int mID = NO_ID; 1558 1559 /** 1560 * The stable ID of this view for accessibility purposes. 1561 */ 1562 int mAccessibilityViewId = NO_ID; 1563 1564 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1565 1566 SendViewStateChangedAccessibilityEvent mSendViewStateChangedAccessibilityEvent; 1567 1568 /** 1569 * The view's tag. 1570 * {@hide} 1571 * 1572 * @see #setTag(Object) 1573 * @see #getTag() 1574 */ 1575 protected Object mTag; 1576 1577 private Scene mCurrentScene = null; 1578 1579 // for mPrivateFlags: 1580 /** {@hide} */ 1581 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1582 /** {@hide} */ 1583 static final int PFLAG_FOCUSED = 0x00000002; 1584 /** {@hide} */ 1585 static final int PFLAG_SELECTED = 0x00000004; 1586 /** {@hide} */ 1587 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1588 /** {@hide} */ 1589 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1590 /** {@hide} */ 1591 static final int PFLAG_DRAWN = 0x00000020; 1592 /** 1593 * When this flag is set, this view is running an animation on behalf of its 1594 * children and should therefore not cancel invalidate requests, even if they 1595 * lie outside of this view's bounds. 1596 * 1597 * {@hide} 1598 */ 1599 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1600 /** {@hide} */ 1601 static final int PFLAG_SKIP_DRAW = 0x00000080; 1602 /** {@hide} */ 1603 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1604 /** {@hide} */ 1605 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1606 /** {@hide} */ 1607 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1608 /** {@hide} */ 1609 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1610 /** {@hide} */ 1611 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1612 /** {@hide} */ 1613 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1614 1615 private static final int PFLAG_PRESSED = 0x00004000; 1616 1617 /** {@hide} */ 1618 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1619 /** 1620 * Flag used to indicate that this view should be drawn once more (and only once 1621 * more) after its animation has completed. 1622 * {@hide} 1623 */ 1624 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1625 1626 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1627 1628 /** 1629 * Indicates that the View returned true when onSetAlpha() was called and that 1630 * the alpha must be restored. 1631 * {@hide} 1632 */ 1633 static final int PFLAG_ALPHA_SET = 0x00040000; 1634 1635 /** 1636 * Set by {@link #setScrollContainer(boolean)}. 1637 */ 1638 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1639 1640 /** 1641 * Set by {@link #setScrollContainer(boolean)}. 1642 */ 1643 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1644 1645 /** 1646 * View flag indicating whether this view was invalidated (fully or partially.) 1647 * 1648 * @hide 1649 */ 1650 static final int PFLAG_DIRTY = 0x00200000; 1651 1652 /** 1653 * View flag indicating whether this view was invalidated by an opaque 1654 * invalidate request. 1655 * 1656 * @hide 1657 */ 1658 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1659 1660 /** 1661 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1662 * 1663 * @hide 1664 */ 1665 static final int PFLAG_DIRTY_MASK = 0x00600000; 1666 1667 /** 1668 * Indicates whether the background is opaque. 1669 * 1670 * @hide 1671 */ 1672 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1673 1674 /** 1675 * Indicates whether the scrollbars are opaque. 1676 * 1677 * @hide 1678 */ 1679 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1680 1681 /** 1682 * Indicates whether the view is opaque. 1683 * 1684 * @hide 1685 */ 1686 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1687 1688 /** 1689 * Indicates a prepressed state; 1690 * the short time between ACTION_DOWN and recognizing 1691 * a 'real' press. Prepressed is used to recognize quick taps 1692 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1693 * 1694 * @hide 1695 */ 1696 private static final int PFLAG_PREPRESSED = 0x02000000; 1697 1698 /** 1699 * Indicates whether the view is temporarily detached. 1700 * 1701 * @hide 1702 */ 1703 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1704 1705 /** 1706 * Indicates that we should awaken scroll bars once attached 1707 * 1708 * @hide 1709 */ 1710 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1711 1712 /** 1713 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1714 * @hide 1715 */ 1716 private static final int PFLAG_HOVERED = 0x10000000; 1717 1718 /** 1719 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1720 * for transform operations 1721 * 1722 * @hide 1723 */ 1724 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1725 1726 /** {@hide} */ 1727 static final int PFLAG_ACTIVATED = 0x40000000; 1728 1729 /** 1730 * Indicates that this view was specifically invalidated, not just dirtied because some 1731 * child view was invalidated. The flag is used to determine when we need to recreate 1732 * a view's display list (as opposed to just returning a reference to its existing 1733 * display list). 1734 * 1735 * @hide 1736 */ 1737 static final int PFLAG_INVALIDATED = 0x80000000; 1738 1739 /** 1740 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1741 * 1742 * -------|-------|-------|-------| 1743 * PFLAG2_TEXT_ALIGNMENT_FLAGS[0] 1744 * PFLAG2_TEXT_DIRECTION_FLAGS[0] 1745 * 1 PFLAG2_DRAG_CAN_ACCEPT 1746 * 1 PFLAG2_DRAG_HOVERED 1747 * 1 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT 1748 * 11 PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1749 * 1 1 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT 1750 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1751 * 11 1 PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 1752 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1753 * 1 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT 1754 * 1 1 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT 1755 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1756 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1757 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1758 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1759 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1760 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1761 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1762 * 111 PFLAG2_TEXT_DIRECTION_MASK 1763 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1764 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1765 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1766 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1767 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1768 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1769 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1770 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1771 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1772 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1773 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1774 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1775 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1776 * 11 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1777 * 1 PFLAG2_HAS_TRANSIENT_STATE 1778 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1779 * 1 PFLAG2_ACCESSIBILITY_STATE_CHANGED 1780 * 1 PFLAG2_VIEW_QUICK_REJECTED 1781 * 1 PFLAG2_PADDING_RESOLVED 1782 * -------|-------|-------|-------| 1783 */ 1784 1785 /** 1786 * Indicates that this view has reported that it can accept the current drag's content. 1787 * Cleared when the drag operation concludes. 1788 * @hide 1789 */ 1790 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1791 1792 /** 1793 * Indicates that this view is currently directly under the drag location in a 1794 * drag-and-drop operation involving content that it can accept. Cleared when 1795 * the drag exits the view, or when the drag operation concludes. 1796 * @hide 1797 */ 1798 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1799 1800 /** 1801 * Horizontal layout direction of this view is from Left to Right. 1802 * Use with {@link #setLayoutDirection}. 1803 */ 1804 public static final int LAYOUT_DIRECTION_LTR = 0; 1805 1806 /** 1807 * Horizontal layout direction of this view is from Right to Left. 1808 * Use with {@link #setLayoutDirection}. 1809 */ 1810 public static final int LAYOUT_DIRECTION_RTL = 1; 1811 1812 /** 1813 * Horizontal layout direction of this view is inherited from its parent. 1814 * Use with {@link #setLayoutDirection}. 1815 */ 1816 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1817 1818 /** 1819 * Horizontal layout direction of this view is from deduced from the default language 1820 * script for the locale. Use with {@link #setLayoutDirection}. 1821 */ 1822 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1823 1824 /** 1825 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1826 * @hide 1827 */ 1828 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1829 1830 /** 1831 * Mask for use with private flags indicating bits used for horizontal layout direction. 1832 * @hide 1833 */ 1834 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1835 1836 /** 1837 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1838 * right-to-left direction. 1839 * @hide 1840 */ 1841 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1842 1843 /** 1844 * Indicates whether the view horizontal layout direction has been resolved. 1845 * @hide 1846 */ 1847 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1848 1849 /** 1850 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1851 * @hide 1852 */ 1853 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1854 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1855 1856 /* 1857 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1858 * flag value. 1859 * @hide 1860 */ 1861 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1862 LAYOUT_DIRECTION_LTR, 1863 LAYOUT_DIRECTION_RTL, 1864 LAYOUT_DIRECTION_INHERIT, 1865 LAYOUT_DIRECTION_LOCALE 1866 }; 1867 1868 /** 1869 * Default horizontal layout direction. 1870 */ 1871 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1872 1873 /** 1874 * Default horizontal layout direction. 1875 * @hide 1876 */ 1877 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1878 1879 /** 1880 * Indicates that the view is tracking some sort of transient state 1881 * that the app should not need to be aware of, but that the framework 1882 * should take special care to preserve. 1883 * 1884 * @hide 1885 */ 1886 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x1 << 22; 1887 1888 /** 1889 * Text direction is inherited thru {@link ViewGroup} 1890 */ 1891 public static final int TEXT_DIRECTION_INHERIT = 0; 1892 1893 /** 1894 * Text direction is using "first strong algorithm". The first strong directional character 1895 * determines the paragraph direction. If there is no strong directional character, the 1896 * paragraph direction is the view's resolved layout direction. 1897 */ 1898 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1899 1900 /** 1901 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1902 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1903 * If there are neither, the paragraph direction is the view's resolved layout direction. 1904 */ 1905 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1906 1907 /** 1908 * Text direction is forced to LTR. 1909 */ 1910 public static final int TEXT_DIRECTION_LTR = 3; 1911 1912 /** 1913 * Text direction is forced to RTL. 1914 */ 1915 public static final int TEXT_DIRECTION_RTL = 4; 1916 1917 /** 1918 * Text direction is coming from the system Locale. 1919 */ 1920 public static final int TEXT_DIRECTION_LOCALE = 5; 1921 1922 /** 1923 * Default text direction is inherited 1924 */ 1925 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1926 1927 /** 1928 * Default resolved text direction 1929 * @hide 1930 */ 1931 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 1932 1933 /** 1934 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1935 * @hide 1936 */ 1937 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1938 1939 /** 1940 * Mask for use with private flags indicating bits used for text direction. 1941 * @hide 1942 */ 1943 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1944 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1945 1946 /** 1947 * Array of text direction flags for mapping attribute "textDirection" to correct 1948 * flag value. 1949 * @hide 1950 */ 1951 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1952 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1953 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1954 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1955 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1956 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1957 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1958 }; 1959 1960 /** 1961 * Indicates whether the view text direction has been resolved. 1962 * @hide 1963 */ 1964 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1965 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1966 1967 /** 1968 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1969 * @hide 1970 */ 1971 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1972 1973 /** 1974 * Mask for use with private flags indicating bits used for resolved text direction. 1975 * @hide 1976 */ 1977 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1978 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1979 1980 /** 1981 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1982 * @hide 1983 */ 1984 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1985 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1986 1987 /* 1988 * Default text alignment. The text alignment of this View is inherited from its parent. 1989 * Use with {@link #setTextAlignment(int)} 1990 */ 1991 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1992 1993 /** 1994 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1995 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1996 * 1997 * Use with {@link #setTextAlignment(int)} 1998 */ 1999 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 2000 2001 /** 2002 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 2003 * 2004 * Use with {@link #setTextAlignment(int)} 2005 */ 2006 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2007 2008 /** 2009 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2010 * 2011 * Use with {@link #setTextAlignment(int)} 2012 */ 2013 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2014 2015 /** 2016 * Center the paragraph, e.g. ALIGN_CENTER. 2017 * 2018 * Use with {@link #setTextAlignment(int)} 2019 */ 2020 public static final int TEXT_ALIGNMENT_CENTER = 4; 2021 2022 /** 2023 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2024 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2025 * 2026 * Use with {@link #setTextAlignment(int)} 2027 */ 2028 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2029 2030 /** 2031 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2032 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2033 * 2034 * Use with {@link #setTextAlignment(int)} 2035 */ 2036 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2037 2038 /** 2039 * Default text alignment is inherited 2040 */ 2041 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2042 2043 /** 2044 * Default resolved text alignment 2045 * @hide 2046 */ 2047 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2048 2049 /** 2050 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2051 * @hide 2052 */ 2053 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2054 2055 /** 2056 * Mask for use with private flags indicating bits used for text alignment. 2057 * @hide 2058 */ 2059 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2060 2061 /** 2062 * Array of text direction flags for mapping attribute "textAlignment" to correct 2063 * flag value. 2064 * @hide 2065 */ 2066 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2067 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2068 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2069 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2070 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2071 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2072 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2073 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2074 }; 2075 2076 /** 2077 * Indicates whether the view text alignment has been resolved. 2078 * @hide 2079 */ 2080 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2081 2082 /** 2083 * Bit shift to get the resolved text alignment. 2084 * @hide 2085 */ 2086 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2087 2088 /** 2089 * Mask for use with private flags indicating bits used for text alignment. 2090 * @hide 2091 */ 2092 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2093 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2094 2095 /** 2096 * Indicates whether if the view text alignment has been resolved to gravity 2097 */ 2098 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2099 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2100 2101 // Accessiblity constants for mPrivateFlags2 2102 2103 /** 2104 * Shift for the bits in {@link #mPrivateFlags2} related to the 2105 * "importantForAccessibility" attribute. 2106 */ 2107 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2108 2109 /** 2110 * Automatically determine whether a view is important for accessibility. 2111 */ 2112 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2113 2114 /** 2115 * The view is important for accessibility. 2116 */ 2117 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2118 2119 /** 2120 * The view is not important for accessibility. 2121 */ 2122 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2123 2124 /** 2125 * The default whether the view is important for accessibility. 2126 */ 2127 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2128 2129 /** 2130 * Mask for obtainig the bits which specify how to determine 2131 * whether a view is important for accessibility. 2132 */ 2133 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2134 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2135 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2136 2137 /** 2138 * Flag indicating whether a view has accessibility focus. 2139 */ 2140 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x04000000; 2141 2142 /** 2143 * Flag whether the accessibility state of the subtree rooted at this view changed. 2144 */ 2145 static final int PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED = 0x08000000; 2146 2147 /** 2148 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2149 * is used to check whether later changes to the view's transform should invalidate the 2150 * view to force the quickReject test to run again. 2151 */ 2152 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2153 2154 /** 2155 * Flag indicating that start/end padding has been resolved into left/right padding 2156 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2157 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2158 * during measurement. In some special cases this is required such as when an adapter-based 2159 * view measures prospective children without attaching them to a window. 2160 */ 2161 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2162 2163 /** 2164 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2165 */ 2166 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2167 2168 /** 2169 * Group of bits indicating that RTL properties resolution is done. 2170 */ 2171 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2172 PFLAG2_TEXT_DIRECTION_RESOLVED | 2173 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2174 PFLAG2_PADDING_RESOLVED | 2175 PFLAG2_DRAWABLE_RESOLVED; 2176 2177 // There are a couple of flags left in mPrivateFlags2 2178 2179 /* End of masks for mPrivateFlags2 */ 2180 2181 /* Masks for mPrivateFlags3 */ 2182 2183 /** 2184 * Flag indicating that view has a transform animation set on it. This is used to track whether 2185 * an animation is cleared between successive frames, in order to tell the associated 2186 * DisplayList to clear its animation matrix. 2187 */ 2188 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2189 2190 /** 2191 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2192 * animation is cleared between successive frames, in order to tell the associated 2193 * DisplayList to restore its alpha value. 2194 */ 2195 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2196 2197 /** 2198 * Flag indicating that the view has been through at least one layout since it 2199 * was last attached to a window. 2200 */ 2201 static final int PFLAG3_IS_LAID_OUT = 0x4; 2202 2203 /** 2204 * Flag indicating that a call to measure() was skipped and should be done 2205 * instead when layout() is invoked. 2206 */ 2207 static final int PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT = 0x8; 2208 2209 2210 /* End of masks for mPrivateFlags3 */ 2211 2212 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2213 2214 /** 2215 * Always allow a user to over-scroll this view, provided it is a 2216 * view that can scroll. 2217 * 2218 * @see #getOverScrollMode() 2219 * @see #setOverScrollMode(int) 2220 */ 2221 public static final int OVER_SCROLL_ALWAYS = 0; 2222 2223 /** 2224 * Allow a user to over-scroll this view only if the content is large 2225 * enough to meaningfully scroll, provided it is a view that can scroll. 2226 * 2227 * @see #getOverScrollMode() 2228 * @see #setOverScrollMode(int) 2229 */ 2230 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2231 2232 /** 2233 * Never allow a user to over-scroll this view. 2234 * 2235 * @see #getOverScrollMode() 2236 * @see #setOverScrollMode(int) 2237 */ 2238 public static final int OVER_SCROLL_NEVER = 2; 2239 2240 /** 2241 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2242 * requested the system UI (status bar) to be visible (the default). 2243 * 2244 * @see #setSystemUiVisibility(int) 2245 */ 2246 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2247 2248 /** 2249 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2250 * system UI to enter an unobtrusive "low profile" mode. 2251 * 2252 * <p>This is for use in games, book readers, video players, or any other 2253 * "immersive" application where the usual system chrome is deemed too distracting. 2254 * 2255 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2256 * 2257 * @see #setSystemUiVisibility(int) 2258 */ 2259 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2260 2261 /** 2262 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2263 * system navigation be temporarily hidden. 2264 * 2265 * <p>This is an even less obtrusive state than that called for by 2266 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2267 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2268 * those to disappear. This is useful (in conjunction with the 2269 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2270 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2271 * window flags) for displaying content using every last pixel on the display. 2272 * 2273 * <p>There is a limitation: because navigation controls are so important, the least user 2274 * interaction will cause them to reappear immediately. When this happens, both 2275 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2276 * so that both elements reappear at the same time. 2277 * 2278 * @see #setSystemUiVisibility(int) 2279 */ 2280 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2281 2282 /** 2283 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2284 * into the normal fullscreen mode so that its content can take over the screen 2285 * while still allowing the user to interact with the application. 2286 * 2287 * <p>This has the same visual effect as 2288 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2289 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2290 * meaning that non-critical screen decorations (such as the status bar) will be 2291 * hidden while the user is in the View's window, focusing the experience on 2292 * that content. Unlike the window flag, if you are using ActionBar in 2293 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2294 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2295 * hide the action bar. 2296 * 2297 * <p>This approach to going fullscreen is best used over the window flag when 2298 * it is a transient state -- that is, the application does this at certain 2299 * points in its user interaction where it wants to allow the user to focus 2300 * on content, but not as a continuous state. For situations where the application 2301 * would like to simply stay full screen the entire time (such as a game that 2302 * wants to take over the screen), the 2303 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2304 * is usually a better approach. The state set here will be removed by the system 2305 * in various situations (such as the user moving to another application) like 2306 * the other system UI states. 2307 * 2308 * <p>When using this flag, the application should provide some easy facility 2309 * for the user to go out of it. A common example would be in an e-book 2310 * reader, where tapping on the screen brings back whatever screen and UI 2311 * decorations that had been hidden while the user was immersed in reading 2312 * the book. 2313 * 2314 * @see #setSystemUiVisibility(int) 2315 */ 2316 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2317 2318 /** 2319 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2320 * flags, we would like a stable view of the content insets given to 2321 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2322 * will always represent the worst case that the application can expect 2323 * as a continuous state. In the stock Android UI this is the space for 2324 * the system bar, nav bar, and status bar, but not more transient elements 2325 * such as an input method. 2326 * 2327 * The stable layout your UI sees is based on the system UI modes you can 2328 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2329 * then you will get a stable layout for changes of the 2330 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2331 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2332 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2333 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2334 * with a stable layout. (Note that you should avoid using 2335 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2336 * 2337 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2338 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2339 * then a hidden status bar will be considered a "stable" state for purposes 2340 * here. This allows your UI to continually hide the status bar, while still 2341 * using the system UI flags to hide the action bar while still retaining 2342 * a stable layout. Note that changing the window fullscreen flag will never 2343 * provide a stable layout for a clean transition. 2344 * 2345 * <p>If you are using ActionBar in 2346 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2347 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2348 * insets it adds to those given to the application. 2349 */ 2350 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2351 2352 /** 2353 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2354 * to be layed out as if it has requested 2355 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2356 * allows it to avoid artifacts when switching in and out of that mode, at 2357 * the expense that some of its user interface may be covered by screen 2358 * decorations when they are shown. You can perform layout of your inner 2359 * UI elements to account for the navigation system UI through the 2360 * {@link #fitSystemWindows(Rect)} method. 2361 */ 2362 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2363 2364 /** 2365 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2366 * to be layed out as if it has requested 2367 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2368 * allows it to avoid artifacts when switching in and out of that mode, at 2369 * the expense that some of its user interface may be covered by screen 2370 * decorations when they are shown. You can perform layout of your inner 2371 * UI elements to account for non-fullscreen system UI through the 2372 * {@link #fitSystemWindows(Rect)} method. 2373 */ 2374 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2375 2376 /** 2377 * Flag for {@link #setSystemUiVisibility(int)}: View would like to receive touch events 2378 * when hiding the status bar with {@link #SYSTEM_UI_FLAG_FULLSCREEN} and/or hiding the 2379 * navigation bar with {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} instead of having the system 2380 * clear these flags upon interaction. The system may compensate by temporarily overlaying 2381 * transparent system ui while also delivering the event. 2382 */ 2383 public static final int SYSTEM_UI_FLAG_ALLOW_OVERLAY = 0x00000800; 2384 2385 /** 2386 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2387 */ 2388 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2389 2390 /** 2391 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2392 */ 2393 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2394 2395 /** 2396 * @hide 2397 * 2398 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2399 * out of the public fields to keep the undefined bits out of the developer's way. 2400 * 2401 * Flag to make the status bar not expandable. Unless you also 2402 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2403 */ 2404 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2405 2406 /** 2407 * @hide 2408 * 2409 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2410 * out of the public fields to keep the undefined bits out of the developer's way. 2411 * 2412 * Flag to hide notification icons and scrolling ticker text. 2413 */ 2414 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2415 2416 /** 2417 * @hide 2418 * 2419 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2420 * out of the public fields to keep the undefined bits out of the developer's way. 2421 * 2422 * Flag to disable incoming notification alerts. This will not block 2423 * icons, but it will block sound, vibrating and other visual or aural notifications. 2424 */ 2425 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2426 2427 /** 2428 * @hide 2429 * 2430 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2431 * out of the public fields to keep the undefined bits out of the developer's way. 2432 * 2433 * Flag to hide only the scrolling ticker. Note that 2434 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2435 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2436 */ 2437 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2438 2439 /** 2440 * @hide 2441 * 2442 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2443 * out of the public fields to keep the undefined bits out of the developer's way. 2444 * 2445 * Flag to hide the center system info area. 2446 */ 2447 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2448 2449 /** 2450 * @hide 2451 * 2452 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2453 * out of the public fields to keep the undefined bits out of the developer's way. 2454 * 2455 * Flag to hide only the home button. Don't use this 2456 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2457 */ 2458 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2459 2460 /** 2461 * @hide 2462 * 2463 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2464 * out of the public fields to keep the undefined bits out of the developer's way. 2465 * 2466 * Flag to hide only the back button. Don't use this 2467 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2468 */ 2469 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2470 2471 /** 2472 * @hide 2473 * 2474 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2475 * out of the public fields to keep the undefined bits out of the developer's way. 2476 * 2477 * Flag to hide only the clock. You might use this if your activity has 2478 * its own clock making the status bar's clock redundant. 2479 */ 2480 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2481 2482 /** 2483 * @hide 2484 * 2485 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2486 * out of the public fields to keep the undefined bits out of the developer's way. 2487 * 2488 * Flag to hide only the recent apps button. Don't use this 2489 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2490 */ 2491 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2492 2493 /** 2494 * @hide 2495 * 2496 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2497 * out of the public fields to keep the undefined bits out of the developer's way. 2498 * 2499 * Flag to disable the global search gesture. Don't use this 2500 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2501 */ 2502 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2503 2504 /** 2505 * @hide 2506 * 2507 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2508 * out of the public fields to keep the undefined bits out of the developer's way. 2509 * 2510 * Flag to specify that the status bar should temporarily overlay underlying content 2511 * that is otherwise assuming the status bar is hidden. The status bar may 2512 * have some degree of transparency while in this temporary overlay mode. 2513 */ 2514 public static final int STATUS_BAR_OVERLAY = 0x04000000; 2515 2516 /** 2517 * @hide 2518 * 2519 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2520 * out of the public fields to keep the undefined bits out of the developer's way. 2521 * 2522 * Flag to specify that the navigation bar should temporarily overlay underlying content 2523 * that is otherwise assuming the navigation bar is hidden. The navigation bar mayu 2524 * have some degree of transparency while in this temporary overlay mode. 2525 */ 2526 public static final int NAVIGATION_BAR_OVERLAY = 0x08000000; 2527 2528 /** 2529 * @hide 2530 */ 2531 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2532 2533 /** 2534 * These are the system UI flags that can be cleared by events outside 2535 * of an application. Currently this is just the ability to tap on the 2536 * screen while hiding the navigation bar to have it return. 2537 * @hide 2538 */ 2539 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2540 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2541 | SYSTEM_UI_FLAG_FULLSCREEN; 2542 2543 /** 2544 * Flags that can impact the layout in relation to system UI. 2545 */ 2546 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2547 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2548 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2549 2550 /** 2551 * Find views that render the specified text. 2552 * 2553 * @see #findViewsWithText(ArrayList, CharSequence, int) 2554 */ 2555 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2556 2557 /** 2558 * Find find views that contain the specified content description. 2559 * 2560 * @see #findViewsWithText(ArrayList, CharSequence, int) 2561 */ 2562 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2563 2564 /** 2565 * Find views that contain {@link AccessibilityNodeProvider}. Such 2566 * a View is a root of virtual view hierarchy and may contain the searched 2567 * text. If this flag is set Views with providers are automatically 2568 * added and it is a responsibility of the client to call the APIs of 2569 * the provider to determine whether the virtual tree rooted at this View 2570 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2571 * represeting the virtual views with this text. 2572 * 2573 * @see #findViewsWithText(ArrayList, CharSequence, int) 2574 * 2575 * @hide 2576 */ 2577 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2578 2579 /** 2580 * The undefined cursor position. 2581 * 2582 * @hide 2583 */ 2584 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2585 2586 /** 2587 * Indicates that the screen has changed state and is now off. 2588 * 2589 * @see #onScreenStateChanged(int) 2590 */ 2591 public static final int SCREEN_STATE_OFF = 0x0; 2592 2593 /** 2594 * Indicates that the screen has changed state and is now on. 2595 * 2596 * @see #onScreenStateChanged(int) 2597 */ 2598 public static final int SCREEN_STATE_ON = 0x1; 2599 2600 /** 2601 * Controls the over-scroll mode for this view. 2602 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2603 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2604 * and {@link #OVER_SCROLL_NEVER}. 2605 */ 2606 private int mOverScrollMode; 2607 2608 /** 2609 * The parent this view is attached to. 2610 * {@hide} 2611 * 2612 * @see #getParent() 2613 */ 2614 protected ViewParent mParent; 2615 2616 /** 2617 * {@hide} 2618 */ 2619 AttachInfo mAttachInfo; 2620 2621 /** 2622 * {@hide} 2623 */ 2624 @ViewDebug.ExportedProperty(flagMapping = { 2625 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2626 name = "FORCE_LAYOUT"), 2627 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2628 name = "LAYOUT_REQUIRED"), 2629 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2630 name = "DRAWING_CACHE_INVALID", outputIf = false), 2631 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2632 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2633 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2634 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2635 }) 2636 int mPrivateFlags; 2637 int mPrivateFlags2; 2638 int mPrivateFlags3; 2639 2640 /** 2641 * This view's request for the visibility of the status bar. 2642 * @hide 2643 */ 2644 @ViewDebug.ExportedProperty(flagMapping = { 2645 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2646 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2647 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2648 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2649 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2650 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2651 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2652 equals = SYSTEM_UI_FLAG_VISIBLE, 2653 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2654 }) 2655 int mSystemUiVisibility; 2656 2657 /** 2658 * Reference count for transient state. 2659 * @see #setHasTransientState(boolean) 2660 */ 2661 int mTransientStateCount = 0; 2662 2663 /** 2664 * Count of how many windows this view has been attached to. 2665 */ 2666 int mWindowAttachCount; 2667 2668 /** 2669 * The layout parameters associated with this view and used by the parent 2670 * {@link android.view.ViewGroup} to determine how this view should be 2671 * laid out. 2672 * {@hide} 2673 */ 2674 protected ViewGroup.LayoutParams mLayoutParams; 2675 2676 /** 2677 * The view flags hold various views states. 2678 * {@hide} 2679 */ 2680 @ViewDebug.ExportedProperty 2681 int mViewFlags; 2682 2683 static class TransformationInfo { 2684 /** 2685 * The transform matrix for the View. This transform is calculated internally 2686 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2687 * is used by default. Do *not* use this variable directly; instead call 2688 * getMatrix(), which will automatically recalculate the matrix if necessary 2689 * to get the correct matrix based on the latest rotation and scale properties. 2690 */ 2691 private final Matrix mMatrix = new Matrix(); 2692 2693 /** 2694 * The transform matrix for the View. This transform is calculated internally 2695 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2696 * is used by default. Do *not* use this variable directly; instead call 2697 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2698 * to get the correct matrix based on the latest rotation and scale properties. 2699 */ 2700 private Matrix mInverseMatrix; 2701 2702 /** 2703 * An internal variable that tracks whether we need to recalculate the 2704 * transform matrix, based on whether the rotation or scaleX/Y properties 2705 * have changed since the matrix was last calculated. 2706 */ 2707 boolean mMatrixDirty = false; 2708 2709 /** 2710 * An internal variable that tracks whether we need to recalculate the 2711 * transform matrix, based on whether the rotation or scaleX/Y properties 2712 * have changed since the matrix was last calculated. 2713 */ 2714 private boolean mInverseMatrixDirty = true; 2715 2716 /** 2717 * A variable that tracks whether we need to recalculate the 2718 * transform matrix, based on whether the rotation or scaleX/Y properties 2719 * have changed since the matrix was last calculated. This variable 2720 * is only valid after a call to updateMatrix() or to a function that 2721 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2722 */ 2723 private boolean mMatrixIsIdentity = true; 2724 2725 /** 2726 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2727 */ 2728 private Camera mCamera = null; 2729 2730 /** 2731 * This matrix is used when computing the matrix for 3D rotations. 2732 */ 2733 private Matrix matrix3D = null; 2734 2735 /** 2736 * These prev values are used to recalculate a centered pivot point when necessary. The 2737 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2738 * set), so thes values are only used then as well. 2739 */ 2740 private int mPrevWidth = -1; 2741 private int mPrevHeight = -1; 2742 2743 /** 2744 * The degrees rotation around the vertical axis through the pivot point. 2745 */ 2746 @ViewDebug.ExportedProperty 2747 float mRotationY = 0f; 2748 2749 /** 2750 * The degrees rotation around the horizontal axis through the pivot point. 2751 */ 2752 @ViewDebug.ExportedProperty 2753 float mRotationX = 0f; 2754 2755 /** 2756 * The degrees rotation around the pivot point. 2757 */ 2758 @ViewDebug.ExportedProperty 2759 float mRotation = 0f; 2760 2761 /** 2762 * The amount of translation of the object away from its left property (post-layout). 2763 */ 2764 @ViewDebug.ExportedProperty 2765 float mTranslationX = 0f; 2766 2767 /** 2768 * The amount of translation of the object away from its top property (post-layout). 2769 */ 2770 @ViewDebug.ExportedProperty 2771 float mTranslationY = 0f; 2772 2773 /** 2774 * The amount of scale in the x direction around the pivot point. A 2775 * value of 1 means no scaling is applied. 2776 */ 2777 @ViewDebug.ExportedProperty 2778 float mScaleX = 1f; 2779 2780 /** 2781 * The amount of scale in the y direction around the pivot point. A 2782 * value of 1 means no scaling is applied. 2783 */ 2784 @ViewDebug.ExportedProperty 2785 float mScaleY = 1f; 2786 2787 /** 2788 * The x location of the point around which the view is rotated and scaled. 2789 */ 2790 @ViewDebug.ExportedProperty 2791 float mPivotX = 0f; 2792 2793 /** 2794 * The y location of the point around which the view is rotated and scaled. 2795 */ 2796 @ViewDebug.ExportedProperty 2797 float mPivotY = 0f; 2798 2799 /** 2800 * The opacity of the View. This is a value from 0 to 1, where 0 means 2801 * completely transparent and 1 means completely opaque. 2802 */ 2803 @ViewDebug.ExportedProperty 2804 float mAlpha = 1f; 2805 } 2806 2807 TransformationInfo mTransformationInfo; 2808 2809 /** 2810 * Current clip bounds. to which all drawing of this view are constrained. 2811 */ 2812 private Rect mClipBounds = null; 2813 2814 private boolean mLastIsOpaque; 2815 2816 /** 2817 * Convenience value to check for float values that are close enough to zero to be considered 2818 * zero. 2819 */ 2820 private static final float NONZERO_EPSILON = .001f; 2821 2822 /** 2823 * The distance in pixels from the left edge of this view's parent 2824 * to the left edge of this view. 2825 * {@hide} 2826 */ 2827 @ViewDebug.ExportedProperty(category = "layout") 2828 protected int mLeft; 2829 /** 2830 * The distance in pixels from the left edge of this view's parent 2831 * to the right edge of this view. 2832 * {@hide} 2833 */ 2834 @ViewDebug.ExportedProperty(category = "layout") 2835 protected int mRight; 2836 /** 2837 * The distance in pixels from the top edge of this view's parent 2838 * to the top edge of this view. 2839 * {@hide} 2840 */ 2841 @ViewDebug.ExportedProperty(category = "layout") 2842 protected int mTop; 2843 /** 2844 * The distance in pixels from the top edge of this view's parent 2845 * to the bottom edge of this view. 2846 * {@hide} 2847 */ 2848 @ViewDebug.ExportedProperty(category = "layout") 2849 protected int mBottom; 2850 2851 /** 2852 * The offset, in pixels, by which the content of this view is scrolled 2853 * horizontally. 2854 * {@hide} 2855 */ 2856 @ViewDebug.ExportedProperty(category = "scrolling") 2857 protected int mScrollX; 2858 /** 2859 * The offset, in pixels, by which the content of this view is scrolled 2860 * vertically. 2861 * {@hide} 2862 */ 2863 @ViewDebug.ExportedProperty(category = "scrolling") 2864 protected int mScrollY; 2865 2866 /** 2867 * The left padding in pixels, that is the distance in pixels between the 2868 * left edge of this view and the left edge of its content. 2869 * {@hide} 2870 */ 2871 @ViewDebug.ExportedProperty(category = "padding") 2872 protected int mPaddingLeft = 0; 2873 /** 2874 * The right padding in pixels, that is the distance in pixels between the 2875 * right edge of this view and the right edge of its content. 2876 * {@hide} 2877 */ 2878 @ViewDebug.ExportedProperty(category = "padding") 2879 protected int mPaddingRight = 0; 2880 /** 2881 * The top padding in pixels, that is the distance in pixels between the 2882 * top edge of this view and the top edge of its content. 2883 * {@hide} 2884 */ 2885 @ViewDebug.ExportedProperty(category = "padding") 2886 protected int mPaddingTop; 2887 /** 2888 * The bottom padding in pixels, that is the distance in pixels between the 2889 * bottom edge of this view and the bottom edge of its content. 2890 * {@hide} 2891 */ 2892 @ViewDebug.ExportedProperty(category = "padding") 2893 protected int mPaddingBottom; 2894 2895 /** 2896 * The layout insets in pixels, that is the distance in pixels between the 2897 * visible edges of this view its bounds. 2898 */ 2899 private Insets mLayoutInsets; 2900 2901 /** 2902 * Briefly describes the view and is primarily used for accessibility support. 2903 */ 2904 private CharSequence mContentDescription; 2905 2906 /** 2907 * Specifies the id of a view for which this view serves as a label for 2908 * accessibility purposes. 2909 */ 2910 private int mLabelForId = View.NO_ID; 2911 2912 /** 2913 * Predicate for matching labeled view id with its label for 2914 * accessibility purposes. 2915 */ 2916 private MatchLabelForPredicate mMatchLabelForPredicate; 2917 2918 /** 2919 * Predicate for matching a view by its id. 2920 */ 2921 private MatchIdPredicate mMatchIdPredicate; 2922 2923 /** 2924 * Cache the paddingRight set by the user to append to the scrollbar's size. 2925 * 2926 * @hide 2927 */ 2928 @ViewDebug.ExportedProperty(category = "padding") 2929 protected int mUserPaddingRight; 2930 2931 /** 2932 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2933 * 2934 * @hide 2935 */ 2936 @ViewDebug.ExportedProperty(category = "padding") 2937 protected int mUserPaddingBottom; 2938 2939 /** 2940 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2941 * 2942 * @hide 2943 */ 2944 @ViewDebug.ExportedProperty(category = "padding") 2945 protected int mUserPaddingLeft; 2946 2947 /** 2948 * Cache the paddingStart set by the user to append to the scrollbar's size. 2949 * 2950 */ 2951 @ViewDebug.ExportedProperty(category = "padding") 2952 int mUserPaddingStart; 2953 2954 /** 2955 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2956 * 2957 */ 2958 @ViewDebug.ExportedProperty(category = "padding") 2959 int mUserPaddingEnd; 2960 2961 /** 2962 * Cache initial left padding. 2963 * 2964 * @hide 2965 */ 2966 int mUserPaddingLeftInitial; 2967 2968 /** 2969 * Cache initial right padding. 2970 * 2971 * @hide 2972 */ 2973 int mUserPaddingRightInitial; 2974 2975 /** 2976 * Default undefined padding 2977 */ 2978 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 2979 2980 /** 2981 * @hide 2982 */ 2983 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2984 /** 2985 * @hide 2986 */ 2987 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2988 2989 private LongSparseLongArray mMeasureCache; 2990 2991 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 2992 private Drawable mBackground; 2993 2994 private int mBackgroundResource; 2995 private boolean mBackgroundSizeChanged; 2996 2997 static class ListenerInfo { 2998 /** 2999 * Listener used to dispatch focus change events. 3000 * This field should be made private, so it is hidden from the SDK. 3001 * {@hide} 3002 */ 3003 protected OnFocusChangeListener mOnFocusChangeListener; 3004 3005 /** 3006 * Listeners for layout change events. 3007 */ 3008 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 3009 3010 /** 3011 * Listeners for attach events. 3012 */ 3013 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 3014 3015 /** 3016 * Listener used to dispatch click events. 3017 * This field should be made private, so it is hidden from the SDK. 3018 * {@hide} 3019 */ 3020 public OnClickListener mOnClickListener; 3021 3022 /** 3023 * Listener used to dispatch long click events. 3024 * This field should be made private, so it is hidden from the SDK. 3025 * {@hide} 3026 */ 3027 protected OnLongClickListener mOnLongClickListener; 3028 3029 /** 3030 * Listener used to build the context menu. 3031 * This field should be made private, so it is hidden from the SDK. 3032 * {@hide} 3033 */ 3034 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 3035 3036 private OnKeyListener mOnKeyListener; 3037 3038 private OnTouchListener mOnTouchListener; 3039 3040 private OnHoverListener mOnHoverListener; 3041 3042 private OnGenericMotionListener mOnGenericMotionListener; 3043 3044 private OnDragListener mOnDragListener; 3045 3046 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 3047 } 3048 3049 ListenerInfo mListenerInfo; 3050 3051 /** 3052 * The application environment this view lives in. 3053 * This field should be made private, so it is hidden from the SDK. 3054 * {@hide} 3055 */ 3056 protected Context mContext; 3057 3058 private final Resources mResources; 3059 3060 private ScrollabilityCache mScrollCache; 3061 3062 private int[] mDrawableState = null; 3063 3064 /** 3065 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3066 * the user may specify which view to go to next. 3067 */ 3068 private int mNextFocusLeftId = View.NO_ID; 3069 3070 /** 3071 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3072 * the user may specify which view to go to next. 3073 */ 3074 private int mNextFocusRightId = View.NO_ID; 3075 3076 /** 3077 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3078 * the user may specify which view to go to next. 3079 */ 3080 private int mNextFocusUpId = View.NO_ID; 3081 3082 /** 3083 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3084 * the user may specify which view to go to next. 3085 */ 3086 private int mNextFocusDownId = View.NO_ID; 3087 3088 /** 3089 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3090 * the user may specify which view to go to next. 3091 */ 3092 int mNextFocusForwardId = View.NO_ID; 3093 3094 private CheckForLongPress mPendingCheckForLongPress; 3095 private CheckForTap mPendingCheckForTap = null; 3096 private PerformClick mPerformClick; 3097 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3098 3099 private UnsetPressedState mUnsetPressedState; 3100 3101 /** 3102 * Whether the long press's action has been invoked. The tap's action is invoked on the 3103 * up event while a long press is invoked as soon as the long press duration is reached, so 3104 * a long press could be performed before the tap is checked, in which case the tap's action 3105 * should not be invoked. 3106 */ 3107 private boolean mHasPerformedLongPress; 3108 3109 /** 3110 * The minimum height of the view. We'll try our best to have the height 3111 * of this view to at least this amount. 3112 */ 3113 @ViewDebug.ExportedProperty(category = "measurement") 3114 private int mMinHeight; 3115 3116 /** 3117 * The minimum width of the view. We'll try our best to have the width 3118 * of this view to at least this amount. 3119 */ 3120 @ViewDebug.ExportedProperty(category = "measurement") 3121 private int mMinWidth; 3122 3123 /** 3124 * The delegate to handle touch events that are physically in this view 3125 * but should be handled by another view. 3126 */ 3127 private TouchDelegate mTouchDelegate = null; 3128 3129 /** 3130 * Solid color to use as a background when creating the drawing cache. Enables 3131 * the cache to use 16 bit bitmaps instead of 32 bit. 3132 */ 3133 private int mDrawingCacheBackgroundColor = 0; 3134 3135 /** 3136 * Special tree observer used when mAttachInfo is null. 3137 */ 3138 private ViewTreeObserver mFloatingTreeObserver; 3139 3140 /** 3141 * Cache the touch slop from the context that created the view. 3142 */ 3143 private int mTouchSlop; 3144 3145 /** 3146 * Object that handles automatic animation of view properties. 3147 */ 3148 private ViewPropertyAnimator mAnimator = null; 3149 3150 /** 3151 * Flag indicating that a drag can cross window boundaries. When 3152 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3153 * with this flag set, all visible applications will be able to participate 3154 * in the drag operation and receive the dragged content. 3155 * 3156 * @hide 3157 */ 3158 public static final int DRAG_FLAG_GLOBAL = 1; 3159 3160 /** 3161 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3162 */ 3163 private float mVerticalScrollFactor; 3164 3165 /** 3166 * Position of the vertical scroll bar. 3167 */ 3168 private int mVerticalScrollbarPosition; 3169 3170 /** 3171 * Position the scroll bar at the default position as determined by the system. 3172 */ 3173 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3174 3175 /** 3176 * Position the scroll bar along the left edge. 3177 */ 3178 public static final int SCROLLBAR_POSITION_LEFT = 1; 3179 3180 /** 3181 * Position the scroll bar along the right edge. 3182 */ 3183 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3184 3185 /** 3186 * Indicates that the view does not have a layer. 3187 * 3188 * @see #getLayerType() 3189 * @see #setLayerType(int, android.graphics.Paint) 3190 * @see #LAYER_TYPE_SOFTWARE 3191 * @see #LAYER_TYPE_HARDWARE 3192 */ 3193 public static final int LAYER_TYPE_NONE = 0; 3194 3195 /** 3196 * <p>Indicates that the view has a software layer. A software layer is backed 3197 * by a bitmap and causes the view to be rendered using Android's software 3198 * rendering pipeline, even if hardware acceleration is enabled.</p> 3199 * 3200 * <p>Software layers have various usages:</p> 3201 * <p>When the application is not using hardware acceleration, a software layer 3202 * is useful to apply a specific color filter and/or blending mode and/or 3203 * translucency to a view and all its children.</p> 3204 * <p>When the application is using hardware acceleration, a software layer 3205 * is useful to render drawing primitives not supported by the hardware 3206 * accelerated pipeline. It can also be used to cache a complex view tree 3207 * into a texture and reduce the complexity of drawing operations. For instance, 3208 * when animating a complex view tree with a translation, a software layer can 3209 * be used to render the view tree only once.</p> 3210 * <p>Software layers should be avoided when the affected view tree updates 3211 * often. Every update will require to re-render the software layer, which can 3212 * potentially be slow (particularly when hardware acceleration is turned on 3213 * since the layer will have to be uploaded into a hardware texture after every 3214 * update.)</p> 3215 * 3216 * @see #getLayerType() 3217 * @see #setLayerType(int, android.graphics.Paint) 3218 * @see #LAYER_TYPE_NONE 3219 * @see #LAYER_TYPE_HARDWARE 3220 */ 3221 public static final int LAYER_TYPE_SOFTWARE = 1; 3222 3223 /** 3224 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3225 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3226 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3227 * rendering pipeline, but only if hardware acceleration is turned on for the 3228 * view hierarchy. When hardware acceleration is turned off, hardware layers 3229 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3230 * 3231 * <p>A hardware layer is useful to apply a specific color filter and/or 3232 * blending mode and/or translucency to a view and all its children.</p> 3233 * <p>A hardware layer can be used to cache a complex view tree into a 3234 * texture and reduce the complexity of drawing operations. For instance, 3235 * when animating a complex view tree with a translation, a hardware layer can 3236 * be used to render the view tree only once.</p> 3237 * <p>A hardware layer can also be used to increase the rendering quality when 3238 * rotation transformations are applied on a view. It can also be used to 3239 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3240 * 3241 * @see #getLayerType() 3242 * @see #setLayerType(int, android.graphics.Paint) 3243 * @see #LAYER_TYPE_NONE 3244 * @see #LAYER_TYPE_SOFTWARE 3245 */ 3246 public static final int LAYER_TYPE_HARDWARE = 2; 3247 3248 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3249 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3250 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3251 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3252 }) 3253 int mLayerType = LAYER_TYPE_NONE; 3254 Paint mLayerPaint; 3255 Rect mLocalDirtyRect; 3256 private HardwareLayer mHardwareLayer; 3257 3258 /** 3259 * Set to true when drawing cache is enabled and cannot be created. 3260 * 3261 * @hide 3262 */ 3263 public boolean mCachingFailed; 3264 private Bitmap mDrawingCache; 3265 private Bitmap mUnscaledDrawingCache; 3266 3267 DisplayList mDisplayList; 3268 3269 /** 3270 * Set to true when the view is sending hover accessibility events because it 3271 * is the innermost hovered view. 3272 */ 3273 private boolean mSendingHoverAccessibilityEvents; 3274 3275 /** 3276 * Delegate for injecting accessibility functionality. 3277 */ 3278 AccessibilityDelegate mAccessibilityDelegate; 3279 3280 /** 3281 * The view's overlay layer. Developers get a reference to the overlay via getOverlay() 3282 * and add/remove objects to/from the overlay directly through the Overlay methods. 3283 */ 3284 ViewOverlay mOverlay; 3285 3286 /** 3287 * Consistency verifier for debugging purposes. 3288 * @hide 3289 */ 3290 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3291 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3292 new InputEventConsistencyVerifier(this, 0) : null; 3293 3294 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3295 3296 /** 3297 * Simple constructor to use when creating a view from code. 3298 * 3299 * @param context The Context the view is running in, through which it can 3300 * access the current theme, resources, etc. 3301 */ 3302 public View(Context context) { 3303 mContext = context; 3304 mResources = context != null ? context.getResources() : null; 3305 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3306 // Set some flags defaults 3307 mPrivateFlags2 = 3308 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3309 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3310 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3311 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3312 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3313 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3314 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3315 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3316 mUserPaddingStart = UNDEFINED_PADDING; 3317 mUserPaddingEnd = UNDEFINED_PADDING; 3318 3319 if (!sUseBrokenMakeMeasureSpec && context != null && 3320 context.getApplicationInfo().targetSdkVersion <= JELLY_BEAN_MR1) { 3321 // Older apps may need this compatibility hack for measurement. 3322 sUseBrokenMakeMeasureSpec = true; 3323 } 3324 } 3325 3326 /** 3327 * Constructor that is called when inflating a view from XML. This is called 3328 * when a view is being constructed from an XML file, supplying attributes 3329 * that were specified in the XML file. This version uses a default style of 3330 * 0, so the only attribute values applied are those in the Context's Theme 3331 * and the given AttributeSet. 3332 * 3333 * <p> 3334 * The method onFinishInflate() will be called after all children have been 3335 * added. 3336 * 3337 * @param context The Context the view is running in, through which it can 3338 * access the current theme, resources, etc. 3339 * @param attrs The attributes of the XML tag that is inflating the view. 3340 * @see #View(Context, AttributeSet, int) 3341 */ 3342 public View(Context context, AttributeSet attrs) { 3343 this(context, attrs, 0); 3344 } 3345 3346 /** 3347 * Perform inflation from XML and apply a class-specific base style. This 3348 * constructor of View allows subclasses to use their own base style when 3349 * they are inflating. For example, a Button class's constructor would call 3350 * this version of the super class constructor and supply 3351 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3352 * the theme's button style to modify all of the base view attributes (in 3353 * particular its background) as well as the Button class's attributes. 3354 * 3355 * @param context The Context the view is running in, through which it can 3356 * access the current theme, resources, etc. 3357 * @param attrs The attributes of the XML tag that is inflating the view. 3358 * @param defStyle The default style to apply to this view. If 0, no style 3359 * will be applied (beyond what is included in the theme). This may 3360 * either be an attribute resource, whose value will be retrieved 3361 * from the current theme, or an explicit style resource. 3362 * @see #View(Context, AttributeSet) 3363 */ 3364 public View(Context context, AttributeSet attrs, int defStyle) { 3365 this(context); 3366 3367 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3368 defStyle, 0); 3369 3370 Drawable background = null; 3371 3372 int leftPadding = -1; 3373 int topPadding = -1; 3374 int rightPadding = -1; 3375 int bottomPadding = -1; 3376 int startPadding = UNDEFINED_PADDING; 3377 int endPadding = UNDEFINED_PADDING; 3378 3379 int padding = -1; 3380 3381 int viewFlagValues = 0; 3382 int viewFlagMasks = 0; 3383 3384 boolean setScrollContainer = false; 3385 3386 int x = 0; 3387 int y = 0; 3388 3389 float tx = 0; 3390 float ty = 0; 3391 float rotation = 0; 3392 float rotationX = 0; 3393 float rotationY = 0; 3394 float sx = 1f; 3395 float sy = 1f; 3396 boolean transformSet = false; 3397 3398 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3399 int overScrollMode = mOverScrollMode; 3400 boolean initializeScrollbars = false; 3401 3402 boolean leftPaddingDefined = false; 3403 boolean rightPaddingDefined = false; 3404 boolean startPaddingDefined = false; 3405 boolean endPaddingDefined = false; 3406 3407 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3408 3409 final int N = a.getIndexCount(); 3410 for (int i = 0; i < N; i++) { 3411 int attr = a.getIndex(i); 3412 switch (attr) { 3413 case com.android.internal.R.styleable.View_background: 3414 background = a.getDrawable(attr); 3415 break; 3416 case com.android.internal.R.styleable.View_padding: 3417 padding = a.getDimensionPixelSize(attr, -1); 3418 mUserPaddingLeftInitial = padding; 3419 mUserPaddingRightInitial = padding; 3420 leftPaddingDefined = true; 3421 rightPaddingDefined = true; 3422 break; 3423 case com.android.internal.R.styleable.View_paddingLeft: 3424 leftPadding = a.getDimensionPixelSize(attr, -1); 3425 mUserPaddingLeftInitial = leftPadding; 3426 leftPaddingDefined = true; 3427 break; 3428 case com.android.internal.R.styleable.View_paddingTop: 3429 topPadding = a.getDimensionPixelSize(attr, -1); 3430 break; 3431 case com.android.internal.R.styleable.View_paddingRight: 3432 rightPadding = a.getDimensionPixelSize(attr, -1); 3433 mUserPaddingRightInitial = rightPadding; 3434 rightPaddingDefined = true; 3435 break; 3436 case com.android.internal.R.styleable.View_paddingBottom: 3437 bottomPadding = a.getDimensionPixelSize(attr, -1); 3438 break; 3439 case com.android.internal.R.styleable.View_paddingStart: 3440 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3441 startPaddingDefined = (startPadding != UNDEFINED_PADDING); 3442 break; 3443 case com.android.internal.R.styleable.View_paddingEnd: 3444 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3445 endPaddingDefined = (endPadding != UNDEFINED_PADDING); 3446 break; 3447 case com.android.internal.R.styleable.View_scrollX: 3448 x = a.getDimensionPixelOffset(attr, 0); 3449 break; 3450 case com.android.internal.R.styleable.View_scrollY: 3451 y = a.getDimensionPixelOffset(attr, 0); 3452 break; 3453 case com.android.internal.R.styleable.View_alpha: 3454 setAlpha(a.getFloat(attr, 1f)); 3455 break; 3456 case com.android.internal.R.styleable.View_transformPivotX: 3457 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3458 break; 3459 case com.android.internal.R.styleable.View_transformPivotY: 3460 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3461 break; 3462 case com.android.internal.R.styleable.View_translationX: 3463 tx = a.getDimensionPixelOffset(attr, 0); 3464 transformSet = true; 3465 break; 3466 case com.android.internal.R.styleable.View_translationY: 3467 ty = a.getDimensionPixelOffset(attr, 0); 3468 transformSet = true; 3469 break; 3470 case com.android.internal.R.styleable.View_rotation: 3471 rotation = a.getFloat(attr, 0); 3472 transformSet = true; 3473 break; 3474 case com.android.internal.R.styleable.View_rotationX: 3475 rotationX = a.getFloat(attr, 0); 3476 transformSet = true; 3477 break; 3478 case com.android.internal.R.styleable.View_rotationY: 3479 rotationY = a.getFloat(attr, 0); 3480 transformSet = true; 3481 break; 3482 case com.android.internal.R.styleable.View_scaleX: 3483 sx = a.getFloat(attr, 1f); 3484 transformSet = true; 3485 break; 3486 case com.android.internal.R.styleable.View_scaleY: 3487 sy = a.getFloat(attr, 1f); 3488 transformSet = true; 3489 break; 3490 case com.android.internal.R.styleable.View_id: 3491 mID = a.getResourceId(attr, NO_ID); 3492 break; 3493 case com.android.internal.R.styleable.View_tag: 3494 mTag = a.getText(attr); 3495 break; 3496 case com.android.internal.R.styleable.View_fitsSystemWindows: 3497 if (a.getBoolean(attr, false)) { 3498 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3499 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3500 } 3501 break; 3502 case com.android.internal.R.styleable.View_focusable: 3503 if (a.getBoolean(attr, false)) { 3504 viewFlagValues |= FOCUSABLE; 3505 viewFlagMasks |= FOCUSABLE_MASK; 3506 } 3507 break; 3508 case com.android.internal.R.styleable.View_focusableInTouchMode: 3509 if (a.getBoolean(attr, false)) { 3510 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3511 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3512 } 3513 break; 3514 case com.android.internal.R.styleable.View_clickable: 3515 if (a.getBoolean(attr, false)) { 3516 viewFlagValues |= CLICKABLE; 3517 viewFlagMasks |= CLICKABLE; 3518 } 3519 break; 3520 case com.android.internal.R.styleable.View_longClickable: 3521 if (a.getBoolean(attr, false)) { 3522 viewFlagValues |= LONG_CLICKABLE; 3523 viewFlagMasks |= LONG_CLICKABLE; 3524 } 3525 break; 3526 case com.android.internal.R.styleable.View_saveEnabled: 3527 if (!a.getBoolean(attr, true)) { 3528 viewFlagValues |= SAVE_DISABLED; 3529 viewFlagMasks |= SAVE_DISABLED_MASK; 3530 } 3531 break; 3532 case com.android.internal.R.styleable.View_duplicateParentState: 3533 if (a.getBoolean(attr, false)) { 3534 viewFlagValues |= DUPLICATE_PARENT_STATE; 3535 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3536 } 3537 break; 3538 case com.android.internal.R.styleable.View_visibility: 3539 final int visibility = a.getInt(attr, 0); 3540 if (visibility != 0) { 3541 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3542 viewFlagMasks |= VISIBILITY_MASK; 3543 } 3544 break; 3545 case com.android.internal.R.styleable.View_layoutDirection: 3546 // Clear any layout direction flags (included resolved bits) already set 3547 mPrivateFlags2 &= 3548 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3549 // Set the layout direction flags depending on the value of the attribute 3550 final int layoutDirection = a.getInt(attr, -1); 3551 final int value = (layoutDirection != -1) ? 3552 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3553 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3554 break; 3555 case com.android.internal.R.styleable.View_drawingCacheQuality: 3556 final int cacheQuality = a.getInt(attr, 0); 3557 if (cacheQuality != 0) { 3558 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3559 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3560 } 3561 break; 3562 case com.android.internal.R.styleable.View_contentDescription: 3563 setContentDescription(a.getString(attr)); 3564 break; 3565 case com.android.internal.R.styleable.View_labelFor: 3566 setLabelFor(a.getResourceId(attr, NO_ID)); 3567 break; 3568 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3569 if (!a.getBoolean(attr, true)) { 3570 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3571 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3572 } 3573 break; 3574 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3575 if (!a.getBoolean(attr, true)) { 3576 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3577 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3578 } 3579 break; 3580 case R.styleable.View_scrollbars: 3581 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3582 if (scrollbars != SCROLLBARS_NONE) { 3583 viewFlagValues |= scrollbars; 3584 viewFlagMasks |= SCROLLBARS_MASK; 3585 initializeScrollbars = true; 3586 } 3587 break; 3588 //noinspection deprecation 3589 case R.styleable.View_fadingEdge: 3590 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3591 // Ignore the attribute starting with ICS 3592 break; 3593 } 3594 // With builds < ICS, fall through and apply fading edges 3595 case R.styleable.View_requiresFadingEdge: 3596 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3597 if (fadingEdge != FADING_EDGE_NONE) { 3598 viewFlagValues |= fadingEdge; 3599 viewFlagMasks |= FADING_EDGE_MASK; 3600 initializeFadingEdge(a); 3601 } 3602 break; 3603 case R.styleable.View_scrollbarStyle: 3604 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3605 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3606 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3607 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3608 } 3609 break; 3610 case R.styleable.View_isScrollContainer: 3611 setScrollContainer = true; 3612 if (a.getBoolean(attr, false)) { 3613 setScrollContainer(true); 3614 } 3615 break; 3616 case com.android.internal.R.styleable.View_keepScreenOn: 3617 if (a.getBoolean(attr, false)) { 3618 viewFlagValues |= KEEP_SCREEN_ON; 3619 viewFlagMasks |= KEEP_SCREEN_ON; 3620 } 3621 break; 3622 case R.styleable.View_filterTouchesWhenObscured: 3623 if (a.getBoolean(attr, false)) { 3624 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3625 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3626 } 3627 break; 3628 case R.styleable.View_nextFocusLeft: 3629 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3630 break; 3631 case R.styleable.View_nextFocusRight: 3632 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3633 break; 3634 case R.styleable.View_nextFocusUp: 3635 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3636 break; 3637 case R.styleable.View_nextFocusDown: 3638 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3639 break; 3640 case R.styleable.View_nextFocusForward: 3641 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3642 break; 3643 case R.styleable.View_minWidth: 3644 mMinWidth = a.getDimensionPixelSize(attr, 0); 3645 break; 3646 case R.styleable.View_minHeight: 3647 mMinHeight = a.getDimensionPixelSize(attr, 0); 3648 break; 3649 case R.styleable.View_onClick: 3650 if (context.isRestricted()) { 3651 throw new IllegalStateException("The android:onClick attribute cannot " 3652 + "be used within a restricted context"); 3653 } 3654 3655 final String handlerName = a.getString(attr); 3656 if (handlerName != null) { 3657 setOnClickListener(new OnClickListener() { 3658 private Method mHandler; 3659 3660 public void onClick(View v) { 3661 if (mHandler == null) { 3662 try { 3663 mHandler = getContext().getClass().getMethod(handlerName, 3664 View.class); 3665 } catch (NoSuchMethodException e) { 3666 int id = getId(); 3667 String idText = id == NO_ID ? "" : " with id '" 3668 + getContext().getResources().getResourceEntryName( 3669 id) + "'"; 3670 throw new IllegalStateException("Could not find a method " + 3671 handlerName + "(View) in the activity " 3672 + getContext().getClass() + " for onClick handler" 3673 + " on view " + View.this.getClass() + idText, e); 3674 } 3675 } 3676 3677 try { 3678 mHandler.invoke(getContext(), View.this); 3679 } catch (IllegalAccessException e) { 3680 throw new IllegalStateException("Could not execute non " 3681 + "public method of the activity", e); 3682 } catch (InvocationTargetException e) { 3683 throw new IllegalStateException("Could not execute " 3684 + "method of the activity", e); 3685 } 3686 } 3687 }); 3688 } 3689 break; 3690 case R.styleable.View_overScrollMode: 3691 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3692 break; 3693 case R.styleable.View_verticalScrollbarPosition: 3694 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3695 break; 3696 case R.styleable.View_layerType: 3697 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3698 break; 3699 case R.styleable.View_textDirection: 3700 // Clear any text direction flag already set 3701 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3702 // Set the text direction flags depending on the value of the attribute 3703 final int textDirection = a.getInt(attr, -1); 3704 if (textDirection != -1) { 3705 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3706 } 3707 break; 3708 case R.styleable.View_textAlignment: 3709 // Clear any text alignment flag already set 3710 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3711 // Set the text alignment flag depending on the value of the attribute 3712 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3713 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3714 break; 3715 case R.styleable.View_importantForAccessibility: 3716 setImportantForAccessibility(a.getInt(attr, 3717 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3718 break; 3719 } 3720 } 3721 3722 setOverScrollMode(overScrollMode); 3723 3724 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3725 // the resolved layout direction). Those cached values will be used later during padding 3726 // resolution. 3727 mUserPaddingStart = startPadding; 3728 mUserPaddingEnd = endPadding; 3729 3730 if (background != null) { 3731 setBackground(background); 3732 } 3733 3734 if (padding >= 0) { 3735 leftPadding = padding; 3736 topPadding = padding; 3737 rightPadding = padding; 3738 bottomPadding = padding; 3739 mUserPaddingLeftInitial = padding; 3740 mUserPaddingRightInitial = padding; 3741 } 3742 3743 if (isRtlCompatibilityMode()) { 3744 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3745 // left / right padding are used if defined (meaning here nothing to do). If they are not 3746 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3747 // start / end and resolve them as left / right (layout direction is not taken into account). 3748 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3749 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3750 // defined. 3751 if (!leftPaddingDefined && startPaddingDefined) { 3752 leftPadding = startPadding; 3753 } 3754 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3755 if (!rightPaddingDefined && endPaddingDefined) { 3756 rightPadding = endPadding; 3757 } 3758 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3759 } else { 3760 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3761 // values defined. Otherwise, left /right values are used. 3762 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3763 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3764 // defined. 3765 final boolean hasRelativePadding = startPaddingDefined || endPaddingDefined; 3766 3767 if (leftPaddingDefined && !hasRelativePadding) { 3768 mUserPaddingLeftInitial = leftPadding; 3769 } 3770 if (rightPaddingDefined && !hasRelativePadding) { 3771 mUserPaddingRightInitial = rightPadding; 3772 } 3773 } 3774 3775 internalSetPadding( 3776 mUserPaddingLeftInitial, 3777 topPadding >= 0 ? topPadding : mPaddingTop, 3778 mUserPaddingRightInitial, 3779 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3780 3781 if (viewFlagMasks != 0) { 3782 setFlags(viewFlagValues, viewFlagMasks); 3783 } 3784 3785 if (initializeScrollbars) { 3786 initializeScrollbars(a); 3787 } 3788 3789 a.recycle(); 3790 3791 // Needs to be called after mViewFlags is set 3792 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3793 recomputePadding(); 3794 } 3795 3796 if (x != 0 || y != 0) { 3797 scrollTo(x, y); 3798 } 3799 3800 if (transformSet) { 3801 setTranslationX(tx); 3802 setTranslationY(ty); 3803 setRotation(rotation); 3804 setRotationX(rotationX); 3805 setRotationY(rotationY); 3806 setScaleX(sx); 3807 setScaleY(sy); 3808 } 3809 3810 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3811 setScrollContainer(true); 3812 } 3813 3814 computeOpaqueFlags(); 3815 } 3816 3817 /** 3818 * Non-public constructor for use in testing 3819 */ 3820 View() { 3821 mResources = null; 3822 } 3823 3824 public String toString() { 3825 StringBuilder out = new StringBuilder(128); 3826 out.append(getClass().getName()); 3827 out.append('{'); 3828 out.append(Integer.toHexString(System.identityHashCode(this))); 3829 out.append(' '); 3830 switch (mViewFlags&VISIBILITY_MASK) { 3831 case VISIBLE: out.append('V'); break; 3832 case INVISIBLE: out.append('I'); break; 3833 case GONE: out.append('G'); break; 3834 default: out.append('.'); break; 3835 } 3836 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3837 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3838 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3839 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3840 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3841 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3842 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3843 out.append(' '); 3844 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3845 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3846 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3847 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3848 out.append('p'); 3849 } else { 3850 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3851 } 3852 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3853 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3854 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3855 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3856 out.append(' '); 3857 out.append(mLeft); 3858 out.append(','); 3859 out.append(mTop); 3860 out.append('-'); 3861 out.append(mRight); 3862 out.append(','); 3863 out.append(mBottom); 3864 final int id = getId(); 3865 if (id != NO_ID) { 3866 out.append(" #"); 3867 out.append(Integer.toHexString(id)); 3868 final Resources r = mResources; 3869 if (id != 0 && r != null) { 3870 try { 3871 String pkgname; 3872 switch (id&0xff000000) { 3873 case 0x7f000000: 3874 pkgname="app"; 3875 break; 3876 case 0x01000000: 3877 pkgname="android"; 3878 break; 3879 default: 3880 pkgname = r.getResourcePackageName(id); 3881 break; 3882 } 3883 String typename = r.getResourceTypeName(id); 3884 String entryname = r.getResourceEntryName(id); 3885 out.append(" "); 3886 out.append(pkgname); 3887 out.append(":"); 3888 out.append(typename); 3889 out.append("/"); 3890 out.append(entryname); 3891 } catch (Resources.NotFoundException e) { 3892 } 3893 } 3894 } 3895 out.append("}"); 3896 return out.toString(); 3897 } 3898 3899 /** 3900 * <p> 3901 * Initializes the fading edges from a given set of styled attributes. This 3902 * method should be called by subclasses that need fading edges and when an 3903 * instance of these subclasses is created programmatically rather than 3904 * being inflated from XML. This method is automatically called when the XML 3905 * is inflated. 3906 * </p> 3907 * 3908 * @param a the styled attributes set to initialize the fading edges from 3909 */ 3910 protected void initializeFadingEdge(TypedArray a) { 3911 initScrollCache(); 3912 3913 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3914 R.styleable.View_fadingEdgeLength, 3915 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3916 } 3917 3918 /** 3919 * Returns the size of the vertical faded edges used to indicate that more 3920 * content in this view is visible. 3921 * 3922 * @return The size in pixels of the vertical faded edge or 0 if vertical 3923 * faded edges are not enabled for this view. 3924 * @attr ref android.R.styleable#View_fadingEdgeLength 3925 */ 3926 public int getVerticalFadingEdgeLength() { 3927 if (isVerticalFadingEdgeEnabled()) { 3928 ScrollabilityCache cache = mScrollCache; 3929 if (cache != null) { 3930 return cache.fadingEdgeLength; 3931 } 3932 } 3933 return 0; 3934 } 3935 3936 /** 3937 * Set the size of the faded edge used to indicate that more content in this 3938 * view is available. Will not change whether the fading edge is enabled; use 3939 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3940 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3941 * for the vertical or horizontal fading edges. 3942 * 3943 * @param length The size in pixels of the faded edge used to indicate that more 3944 * content in this view is visible. 3945 */ 3946 public void setFadingEdgeLength(int length) { 3947 initScrollCache(); 3948 mScrollCache.fadingEdgeLength = length; 3949 } 3950 3951 /** 3952 * Returns the size of the horizontal faded edges used to indicate that more 3953 * content in this view is visible. 3954 * 3955 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3956 * faded edges are not enabled for this view. 3957 * @attr ref android.R.styleable#View_fadingEdgeLength 3958 */ 3959 public int getHorizontalFadingEdgeLength() { 3960 if (isHorizontalFadingEdgeEnabled()) { 3961 ScrollabilityCache cache = mScrollCache; 3962 if (cache != null) { 3963 return cache.fadingEdgeLength; 3964 } 3965 } 3966 return 0; 3967 } 3968 3969 /** 3970 * Returns the width of the vertical scrollbar. 3971 * 3972 * @return The width in pixels of the vertical scrollbar or 0 if there 3973 * is no vertical scrollbar. 3974 */ 3975 public int getVerticalScrollbarWidth() { 3976 ScrollabilityCache cache = mScrollCache; 3977 if (cache != null) { 3978 ScrollBarDrawable scrollBar = cache.scrollBar; 3979 if (scrollBar != null) { 3980 int size = scrollBar.getSize(true); 3981 if (size <= 0) { 3982 size = cache.scrollBarSize; 3983 } 3984 return size; 3985 } 3986 return 0; 3987 } 3988 return 0; 3989 } 3990 3991 /** 3992 * Returns the height of the horizontal scrollbar. 3993 * 3994 * @return The height in pixels of the horizontal scrollbar or 0 if 3995 * there is no horizontal scrollbar. 3996 */ 3997 protected int getHorizontalScrollbarHeight() { 3998 ScrollabilityCache cache = mScrollCache; 3999 if (cache != null) { 4000 ScrollBarDrawable scrollBar = cache.scrollBar; 4001 if (scrollBar != null) { 4002 int size = scrollBar.getSize(false); 4003 if (size <= 0) { 4004 size = cache.scrollBarSize; 4005 } 4006 return size; 4007 } 4008 return 0; 4009 } 4010 return 0; 4011 } 4012 4013 /** 4014 * <p> 4015 * Initializes the scrollbars from a given set of styled attributes. This 4016 * method should be called by subclasses that need scrollbars and when an 4017 * instance of these subclasses is created programmatically rather than 4018 * being inflated from XML. This method is automatically called when the XML 4019 * is inflated. 4020 * </p> 4021 * 4022 * @param a the styled attributes set to initialize the scrollbars from 4023 */ 4024 protected void initializeScrollbars(TypedArray a) { 4025 initScrollCache(); 4026 4027 final ScrollabilityCache scrollabilityCache = mScrollCache; 4028 4029 if (scrollabilityCache.scrollBar == null) { 4030 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 4031 } 4032 4033 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 4034 4035 if (!fadeScrollbars) { 4036 scrollabilityCache.state = ScrollabilityCache.ON; 4037 } 4038 scrollabilityCache.fadeScrollBars = fadeScrollbars; 4039 4040 4041 scrollabilityCache.scrollBarFadeDuration = a.getInt( 4042 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 4043 .getScrollBarFadeDuration()); 4044 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 4045 R.styleable.View_scrollbarDefaultDelayBeforeFade, 4046 ViewConfiguration.getScrollDefaultDelay()); 4047 4048 4049 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 4050 com.android.internal.R.styleable.View_scrollbarSize, 4051 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 4052 4053 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 4054 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 4055 4056 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 4057 if (thumb != null) { 4058 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 4059 } 4060 4061 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 4062 false); 4063 if (alwaysDraw) { 4064 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4065 } 4066 4067 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4068 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4069 4070 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4071 if (thumb != null) { 4072 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4073 } 4074 4075 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4076 false); 4077 if (alwaysDraw) { 4078 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4079 } 4080 4081 // Apply layout direction to the new Drawables if needed 4082 final int layoutDirection = getLayoutDirection(); 4083 if (track != null) { 4084 track.setLayoutDirection(layoutDirection); 4085 } 4086 if (thumb != null) { 4087 thumb.setLayoutDirection(layoutDirection); 4088 } 4089 4090 // Re-apply user/background padding so that scrollbar(s) get added 4091 resolvePadding(); 4092 } 4093 4094 /** 4095 * <p> 4096 * Initalizes the scrollability cache if necessary. 4097 * </p> 4098 */ 4099 private void initScrollCache() { 4100 if (mScrollCache == null) { 4101 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4102 } 4103 } 4104 4105 private ScrollabilityCache getScrollCache() { 4106 initScrollCache(); 4107 return mScrollCache; 4108 } 4109 4110 /** 4111 * Set the position of the vertical scroll bar. Should be one of 4112 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4113 * {@link #SCROLLBAR_POSITION_RIGHT}. 4114 * 4115 * @param position Where the vertical scroll bar should be positioned. 4116 */ 4117 public void setVerticalScrollbarPosition(int position) { 4118 if (mVerticalScrollbarPosition != position) { 4119 mVerticalScrollbarPosition = position; 4120 computeOpaqueFlags(); 4121 resolvePadding(); 4122 } 4123 } 4124 4125 /** 4126 * @return The position where the vertical scroll bar will show, if applicable. 4127 * @see #setVerticalScrollbarPosition(int) 4128 */ 4129 public int getVerticalScrollbarPosition() { 4130 return mVerticalScrollbarPosition; 4131 } 4132 4133 ListenerInfo getListenerInfo() { 4134 if (mListenerInfo != null) { 4135 return mListenerInfo; 4136 } 4137 mListenerInfo = new ListenerInfo(); 4138 return mListenerInfo; 4139 } 4140 4141 /** 4142 * Register a callback to be invoked when focus of this view changed. 4143 * 4144 * @param l The callback that will run. 4145 */ 4146 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4147 getListenerInfo().mOnFocusChangeListener = l; 4148 } 4149 4150 /** 4151 * Add a listener that will be called when the bounds of the view change due to 4152 * layout processing. 4153 * 4154 * @param listener The listener that will be called when layout bounds change. 4155 */ 4156 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4157 ListenerInfo li = getListenerInfo(); 4158 if (li.mOnLayoutChangeListeners == null) { 4159 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4160 } 4161 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4162 li.mOnLayoutChangeListeners.add(listener); 4163 } 4164 } 4165 4166 /** 4167 * Remove a listener for layout changes. 4168 * 4169 * @param listener The listener for layout bounds change. 4170 */ 4171 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4172 ListenerInfo li = mListenerInfo; 4173 if (li == null || li.mOnLayoutChangeListeners == null) { 4174 return; 4175 } 4176 li.mOnLayoutChangeListeners.remove(listener); 4177 } 4178 4179 /** 4180 * Add a listener for attach state changes. 4181 * 4182 * This listener will be called whenever this view is attached or detached 4183 * from a window. Remove the listener using 4184 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4185 * 4186 * @param listener Listener to attach 4187 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4188 */ 4189 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4190 ListenerInfo li = getListenerInfo(); 4191 if (li.mOnAttachStateChangeListeners == null) { 4192 li.mOnAttachStateChangeListeners 4193 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4194 } 4195 li.mOnAttachStateChangeListeners.add(listener); 4196 } 4197 4198 /** 4199 * Remove a listener for attach state changes. The listener will receive no further 4200 * notification of window attach/detach events. 4201 * 4202 * @param listener Listener to remove 4203 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4204 */ 4205 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4206 ListenerInfo li = mListenerInfo; 4207 if (li == null || li.mOnAttachStateChangeListeners == null) { 4208 return; 4209 } 4210 li.mOnAttachStateChangeListeners.remove(listener); 4211 } 4212 4213 /** 4214 * Returns the focus-change callback registered for this view. 4215 * 4216 * @return The callback, or null if one is not registered. 4217 */ 4218 public OnFocusChangeListener getOnFocusChangeListener() { 4219 ListenerInfo li = mListenerInfo; 4220 return li != null ? li.mOnFocusChangeListener : null; 4221 } 4222 4223 /** 4224 * Register a callback to be invoked when this view is clicked. If this view is not 4225 * clickable, it becomes clickable. 4226 * 4227 * @param l The callback that will run 4228 * 4229 * @see #setClickable(boolean) 4230 */ 4231 public void setOnClickListener(OnClickListener l) { 4232 if (!isClickable()) { 4233 setClickable(true); 4234 } 4235 getListenerInfo().mOnClickListener = l; 4236 } 4237 4238 /** 4239 * Return whether this view has an attached OnClickListener. Returns 4240 * true if there is a listener, false if there is none. 4241 */ 4242 public boolean hasOnClickListeners() { 4243 ListenerInfo li = mListenerInfo; 4244 return (li != null && li.mOnClickListener != null); 4245 } 4246 4247 /** 4248 * Register a callback to be invoked when this view is clicked and held. If this view is not 4249 * long clickable, it becomes long clickable. 4250 * 4251 * @param l The callback that will run 4252 * 4253 * @see #setLongClickable(boolean) 4254 */ 4255 public void setOnLongClickListener(OnLongClickListener l) { 4256 if (!isLongClickable()) { 4257 setLongClickable(true); 4258 } 4259 getListenerInfo().mOnLongClickListener = l; 4260 } 4261 4262 /** 4263 * Register a callback to be invoked when the context menu for this view is 4264 * being built. If this view is not long clickable, it becomes long clickable. 4265 * 4266 * @param l The callback that will run 4267 * 4268 */ 4269 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4270 if (!isLongClickable()) { 4271 setLongClickable(true); 4272 } 4273 getListenerInfo().mOnCreateContextMenuListener = l; 4274 } 4275 4276 /** 4277 * Call this view's OnClickListener, if it is defined. Performs all normal 4278 * actions associated with clicking: reporting accessibility event, playing 4279 * a sound, etc. 4280 * 4281 * @return True there was an assigned OnClickListener that was called, false 4282 * otherwise is returned. 4283 */ 4284 public boolean performClick() { 4285 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4286 4287 ListenerInfo li = mListenerInfo; 4288 if (li != null && li.mOnClickListener != null) { 4289 playSoundEffect(SoundEffectConstants.CLICK); 4290 li.mOnClickListener.onClick(this); 4291 return true; 4292 } 4293 4294 return false; 4295 } 4296 4297 /** 4298 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4299 * this only calls the listener, and does not do any associated clicking 4300 * actions like reporting an accessibility event. 4301 * 4302 * @return True there was an assigned OnClickListener that was called, false 4303 * otherwise is returned. 4304 */ 4305 public boolean callOnClick() { 4306 ListenerInfo li = mListenerInfo; 4307 if (li != null && li.mOnClickListener != null) { 4308 li.mOnClickListener.onClick(this); 4309 return true; 4310 } 4311 return false; 4312 } 4313 4314 /** 4315 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4316 * OnLongClickListener did not consume the event. 4317 * 4318 * @return True if one of the above receivers consumed the event, false otherwise. 4319 */ 4320 public boolean performLongClick() { 4321 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4322 4323 boolean handled = false; 4324 ListenerInfo li = mListenerInfo; 4325 if (li != null && li.mOnLongClickListener != null) { 4326 handled = li.mOnLongClickListener.onLongClick(View.this); 4327 } 4328 if (!handled) { 4329 handled = showContextMenu(); 4330 } 4331 if (handled) { 4332 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4333 } 4334 return handled; 4335 } 4336 4337 /** 4338 * Performs button-related actions during a touch down event. 4339 * 4340 * @param event The event. 4341 * @return True if the down was consumed. 4342 * 4343 * @hide 4344 */ 4345 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4346 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4347 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4348 return true; 4349 } 4350 } 4351 return false; 4352 } 4353 4354 /** 4355 * Bring up the context menu for this view. 4356 * 4357 * @return Whether a context menu was displayed. 4358 */ 4359 public boolean showContextMenu() { 4360 return getParent().showContextMenuForChild(this); 4361 } 4362 4363 /** 4364 * Bring up the context menu for this view, referring to the item under the specified point. 4365 * 4366 * @param x The referenced x coordinate. 4367 * @param y The referenced y coordinate. 4368 * @param metaState The keyboard modifiers that were pressed. 4369 * @return Whether a context menu was displayed. 4370 * 4371 * @hide 4372 */ 4373 public boolean showContextMenu(float x, float y, int metaState) { 4374 return showContextMenu(); 4375 } 4376 4377 /** 4378 * Start an action mode. 4379 * 4380 * @param callback Callback that will control the lifecycle of the action mode 4381 * @return The new action mode if it is started, null otherwise 4382 * 4383 * @see ActionMode 4384 */ 4385 public ActionMode startActionMode(ActionMode.Callback callback) { 4386 ViewParent parent = getParent(); 4387 if (parent == null) return null; 4388 return parent.startActionModeForChild(this, callback); 4389 } 4390 4391 /** 4392 * Register a callback to be invoked when a hardware key is pressed in this view. 4393 * Key presses in software input methods will generally not trigger the methods of 4394 * this listener. 4395 * @param l the key listener to attach to this view 4396 */ 4397 public void setOnKeyListener(OnKeyListener l) { 4398 getListenerInfo().mOnKeyListener = l; 4399 } 4400 4401 /** 4402 * Register a callback to be invoked when a touch event is sent to this view. 4403 * @param l the touch listener to attach to this view 4404 */ 4405 public void setOnTouchListener(OnTouchListener l) { 4406 getListenerInfo().mOnTouchListener = l; 4407 } 4408 4409 /** 4410 * Register a callback to be invoked when a generic motion event is sent to this view. 4411 * @param l the generic motion listener to attach to this view 4412 */ 4413 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4414 getListenerInfo().mOnGenericMotionListener = l; 4415 } 4416 4417 /** 4418 * Register a callback to be invoked when a hover event is sent to this view. 4419 * @param l the hover listener to attach to this view 4420 */ 4421 public void setOnHoverListener(OnHoverListener l) { 4422 getListenerInfo().mOnHoverListener = l; 4423 } 4424 4425 /** 4426 * Register a drag event listener callback object for this View. The parameter is 4427 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4428 * View, the system calls the 4429 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4430 * @param l An implementation of {@link android.view.View.OnDragListener}. 4431 */ 4432 public void setOnDragListener(OnDragListener l) { 4433 getListenerInfo().mOnDragListener = l; 4434 } 4435 4436 /** 4437 * Give this view focus. This will cause 4438 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4439 * 4440 * Note: this does not check whether this {@link View} should get focus, it just 4441 * gives it focus no matter what. It should only be called internally by framework 4442 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4443 * 4444 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4445 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4446 * focus moved when requestFocus() is called. It may not always 4447 * apply, in which case use the default View.FOCUS_DOWN. 4448 * @param previouslyFocusedRect The rectangle of the view that had focus 4449 * prior in this View's coordinate system. 4450 */ 4451 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4452 if (DBG) { 4453 System.out.println(this + " requestFocus()"); 4454 } 4455 4456 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4457 mPrivateFlags |= PFLAG_FOCUSED; 4458 4459 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4460 4461 if (mParent != null) { 4462 mParent.requestChildFocus(this, this); 4463 } 4464 4465 if (mAttachInfo != null) { 4466 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4467 } 4468 4469 onFocusChanged(true, direction, previouslyFocusedRect); 4470 refreshDrawableState(); 4471 } 4472 } 4473 4474 /** 4475 * Request that a rectangle of this view be visible on the screen, 4476 * scrolling if necessary just enough. 4477 * 4478 * <p>A View should call this if it maintains some notion of which part 4479 * of its content is interesting. For example, a text editing view 4480 * should call this when its cursor moves. 4481 * 4482 * @param rectangle The rectangle. 4483 * @return Whether any parent scrolled. 4484 */ 4485 public boolean requestRectangleOnScreen(Rect rectangle) { 4486 return requestRectangleOnScreen(rectangle, false); 4487 } 4488 4489 /** 4490 * Request that a rectangle of this view be visible on the screen, 4491 * scrolling if necessary just enough. 4492 * 4493 * <p>A View should call this if it maintains some notion of which part 4494 * of its content is interesting. For example, a text editing view 4495 * should call this when its cursor moves. 4496 * 4497 * <p>When <code>immediate</code> is set to true, scrolling will not be 4498 * animated. 4499 * 4500 * @param rectangle The rectangle. 4501 * @param immediate True to forbid animated scrolling, false otherwise 4502 * @return Whether any parent scrolled. 4503 */ 4504 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4505 if (mParent == null) { 4506 return false; 4507 } 4508 4509 View child = this; 4510 4511 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4512 position.set(rectangle); 4513 4514 ViewParent parent = mParent; 4515 boolean scrolled = false; 4516 while (parent != null) { 4517 rectangle.set((int) position.left, (int) position.top, 4518 (int) position.right, (int) position.bottom); 4519 4520 scrolled |= parent.requestChildRectangleOnScreen(child, 4521 rectangle, immediate); 4522 4523 if (!child.hasIdentityMatrix()) { 4524 child.getMatrix().mapRect(position); 4525 } 4526 4527 position.offset(child.mLeft, child.mTop); 4528 4529 if (!(parent instanceof View)) { 4530 break; 4531 } 4532 4533 View parentView = (View) parent; 4534 4535 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4536 4537 child = parentView; 4538 parent = child.getParent(); 4539 } 4540 4541 return scrolled; 4542 } 4543 4544 /** 4545 * Called when this view wants to give up focus. If focus is cleared 4546 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4547 * <p> 4548 * <strong>Note:</strong> When a View clears focus the framework is trying 4549 * to give focus to the first focusable View from the top. Hence, if this 4550 * View is the first from the top that can take focus, then all callbacks 4551 * related to clearing focus will be invoked after wich the framework will 4552 * give focus to this view. 4553 * </p> 4554 */ 4555 public void clearFocus() { 4556 if (DBG) { 4557 System.out.println(this + " clearFocus()"); 4558 } 4559 4560 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4561 mPrivateFlags &= ~PFLAG_FOCUSED; 4562 4563 if (mParent != null) { 4564 mParent.clearChildFocus(this); 4565 } 4566 4567 onFocusChanged(false, 0, null); 4568 4569 refreshDrawableState(); 4570 4571 if (!rootViewRequestFocus()) { 4572 notifyGlobalFocusCleared(this); 4573 } 4574 } 4575 } 4576 4577 void notifyGlobalFocusCleared(View oldFocus) { 4578 if (oldFocus != null && mAttachInfo != null) { 4579 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 4580 } 4581 } 4582 4583 boolean rootViewRequestFocus() { 4584 final View root = getRootView(); 4585 return root != null && root.requestFocus(); 4586 } 4587 4588 /** 4589 * Called internally by the view system when a new view is getting focus. 4590 * This is what clears the old focus. 4591 */ 4592 void unFocus() { 4593 if (DBG) { 4594 System.out.println(this + " unFocus()"); 4595 } 4596 4597 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4598 mPrivateFlags &= ~PFLAG_FOCUSED; 4599 4600 onFocusChanged(false, 0, null); 4601 refreshDrawableState(); 4602 } 4603 } 4604 4605 /** 4606 * Returns true if this view has focus iteself, or is the ancestor of the 4607 * view that has focus. 4608 * 4609 * @return True if this view has or contains focus, false otherwise. 4610 */ 4611 @ViewDebug.ExportedProperty(category = "focus") 4612 public boolean hasFocus() { 4613 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4614 } 4615 4616 /** 4617 * Returns true if this view is focusable or if it contains a reachable View 4618 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4619 * is a View whose parents do not block descendants focus. 4620 * 4621 * Only {@link #VISIBLE} views are considered focusable. 4622 * 4623 * @return True if the view is focusable or if the view contains a focusable 4624 * View, false otherwise. 4625 * 4626 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4627 */ 4628 public boolean hasFocusable() { 4629 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4630 } 4631 4632 /** 4633 * Called by the view system when the focus state of this view changes. 4634 * When the focus change event is caused by directional navigation, direction 4635 * and previouslyFocusedRect provide insight into where the focus is coming from. 4636 * When overriding, be sure to call up through to the super class so that 4637 * the standard focus handling will occur. 4638 * 4639 * @param gainFocus True if the View has focus; false otherwise. 4640 * @param direction The direction focus has moved when requestFocus() 4641 * is called to give this view focus. Values are 4642 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4643 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4644 * It may not always apply, in which case use the default. 4645 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4646 * system, of the previously focused view. If applicable, this will be 4647 * passed in as finer grained information about where the focus is coming 4648 * from (in addition to direction). Will be <code>null</code> otherwise. 4649 */ 4650 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4651 if (gainFocus) { 4652 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4653 } else { 4654 notifyViewAccessibilityStateChangedIfNeeded(); 4655 } 4656 4657 InputMethodManager imm = InputMethodManager.peekInstance(); 4658 if (!gainFocus) { 4659 if (isPressed()) { 4660 setPressed(false); 4661 } 4662 if (imm != null && mAttachInfo != null 4663 && mAttachInfo.mHasWindowFocus) { 4664 imm.focusOut(this); 4665 } 4666 onFocusLost(); 4667 } else if (imm != null && mAttachInfo != null 4668 && mAttachInfo.mHasWindowFocus) { 4669 imm.focusIn(this); 4670 } 4671 4672 invalidate(true); 4673 ListenerInfo li = mListenerInfo; 4674 if (li != null && li.mOnFocusChangeListener != null) { 4675 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4676 } 4677 4678 if (mAttachInfo != null) { 4679 mAttachInfo.mKeyDispatchState.reset(this); 4680 } 4681 } 4682 4683 /** 4684 * Sends an accessibility event of the given type. If accessibility is 4685 * not enabled this method has no effect. The default implementation calls 4686 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4687 * to populate information about the event source (this View), then calls 4688 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4689 * populate the text content of the event source including its descendants, 4690 * and last calls 4691 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4692 * on its parent to resuest sending of the event to interested parties. 4693 * <p> 4694 * If an {@link AccessibilityDelegate} has been specified via calling 4695 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4696 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4697 * responsible for handling this call. 4698 * </p> 4699 * 4700 * @param eventType The type of the event to send, as defined by several types from 4701 * {@link android.view.accessibility.AccessibilityEvent}, such as 4702 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4703 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4704 * 4705 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4706 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4707 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4708 * @see AccessibilityDelegate 4709 */ 4710 public void sendAccessibilityEvent(int eventType) { 4711 // Excluded views do not send accessibility events. 4712 if (!includeForAccessibility()) { 4713 return; 4714 } 4715 if (mAccessibilityDelegate != null) { 4716 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4717 } else { 4718 sendAccessibilityEventInternal(eventType); 4719 } 4720 } 4721 4722 /** 4723 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4724 * {@link AccessibilityEvent} to make an announcement which is related to some 4725 * sort of a context change for which none of the events representing UI transitions 4726 * is a good fit. For example, announcing a new page in a book. If accessibility 4727 * is not enabled this method does nothing. 4728 * 4729 * @param text The announcement text. 4730 */ 4731 public void announceForAccessibility(CharSequence text) { 4732 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4733 AccessibilityEvent event = AccessibilityEvent.obtain( 4734 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4735 onInitializeAccessibilityEvent(event); 4736 event.getText().add(text); 4737 event.setContentDescription(null); 4738 mParent.requestSendAccessibilityEvent(this, event); 4739 } 4740 } 4741 4742 /** 4743 * @see #sendAccessibilityEvent(int) 4744 * 4745 * Note: Called from the default {@link AccessibilityDelegate}. 4746 */ 4747 void sendAccessibilityEventInternal(int eventType) { 4748 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4749 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4750 } 4751 } 4752 4753 /** 4754 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4755 * takes as an argument an empty {@link AccessibilityEvent} and does not 4756 * perform a check whether accessibility is enabled. 4757 * <p> 4758 * If an {@link AccessibilityDelegate} has been specified via calling 4759 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4760 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4761 * is responsible for handling this call. 4762 * </p> 4763 * 4764 * @param event The event to send. 4765 * 4766 * @see #sendAccessibilityEvent(int) 4767 */ 4768 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4769 if (mAccessibilityDelegate != null) { 4770 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4771 } else { 4772 sendAccessibilityEventUncheckedInternal(event); 4773 } 4774 } 4775 4776 /** 4777 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4778 * 4779 * Note: Called from the default {@link AccessibilityDelegate}. 4780 */ 4781 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4782 if (!isShown()) { 4783 return; 4784 } 4785 onInitializeAccessibilityEvent(event); 4786 // Only a subset of accessibility events populates text content. 4787 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4788 dispatchPopulateAccessibilityEvent(event); 4789 } 4790 // In the beginning we called #isShown(), so we know that getParent() is not null. 4791 getParent().requestSendAccessibilityEvent(this, event); 4792 } 4793 4794 /** 4795 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4796 * to its children for adding their text content to the event. Note that the 4797 * event text is populated in a separate dispatch path since we add to the 4798 * event not only the text of the source but also the text of all its descendants. 4799 * A typical implementation will call 4800 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4801 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4802 * on each child. Override this method if custom population of the event text 4803 * content is required. 4804 * <p> 4805 * If an {@link AccessibilityDelegate} has been specified via calling 4806 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4807 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4808 * is responsible for handling this call. 4809 * </p> 4810 * <p> 4811 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4812 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4813 * </p> 4814 * 4815 * @param event The event. 4816 * 4817 * @return True if the event population was completed. 4818 */ 4819 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4820 if (mAccessibilityDelegate != null) { 4821 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4822 } else { 4823 return dispatchPopulateAccessibilityEventInternal(event); 4824 } 4825 } 4826 4827 /** 4828 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4829 * 4830 * Note: Called from the default {@link AccessibilityDelegate}. 4831 */ 4832 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4833 onPopulateAccessibilityEvent(event); 4834 return false; 4835 } 4836 4837 /** 4838 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4839 * giving a chance to this View to populate the accessibility event with its 4840 * text content. While this method is free to modify event 4841 * attributes other than text content, doing so should normally be performed in 4842 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4843 * <p> 4844 * Example: Adding formatted date string to an accessibility event in addition 4845 * to the text added by the super implementation: 4846 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4847 * super.onPopulateAccessibilityEvent(event); 4848 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4849 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4850 * mCurrentDate.getTimeInMillis(), flags); 4851 * event.getText().add(selectedDateUtterance); 4852 * }</pre> 4853 * <p> 4854 * If an {@link AccessibilityDelegate} has been specified via calling 4855 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4856 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4857 * is responsible for handling this call. 4858 * </p> 4859 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4860 * information to the event, in case the default implementation has basic information to add. 4861 * </p> 4862 * 4863 * @param event The accessibility event which to populate. 4864 * 4865 * @see #sendAccessibilityEvent(int) 4866 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4867 */ 4868 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4869 if (mAccessibilityDelegate != null) { 4870 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4871 } else { 4872 onPopulateAccessibilityEventInternal(event); 4873 } 4874 } 4875 4876 /** 4877 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4878 * 4879 * Note: Called from the default {@link AccessibilityDelegate}. 4880 */ 4881 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4882 } 4883 4884 /** 4885 * Initializes an {@link AccessibilityEvent} with information about 4886 * this View which is the event source. In other words, the source of 4887 * an accessibility event is the view whose state change triggered firing 4888 * the event. 4889 * <p> 4890 * Example: Setting the password property of an event in addition 4891 * to properties set by the super implementation: 4892 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4893 * super.onInitializeAccessibilityEvent(event); 4894 * event.setPassword(true); 4895 * }</pre> 4896 * <p> 4897 * If an {@link AccessibilityDelegate} has been specified via calling 4898 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4899 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4900 * is responsible for handling this call. 4901 * </p> 4902 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4903 * information to the event, in case the default implementation has basic information to add. 4904 * </p> 4905 * @param event The event to initialize. 4906 * 4907 * @see #sendAccessibilityEvent(int) 4908 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4909 */ 4910 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4911 if (mAccessibilityDelegate != null) { 4912 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4913 } else { 4914 onInitializeAccessibilityEventInternal(event); 4915 } 4916 } 4917 4918 /** 4919 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4920 * 4921 * Note: Called from the default {@link AccessibilityDelegate}. 4922 */ 4923 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4924 event.setSource(this); 4925 event.setClassName(View.class.getName()); 4926 event.setPackageName(getContext().getPackageName()); 4927 event.setEnabled(isEnabled()); 4928 event.setContentDescription(mContentDescription); 4929 4930 switch (event.getEventType()) { 4931 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 4932 ArrayList<View> focusablesTempList = (mAttachInfo != null) 4933 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 4934 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 4935 event.setItemCount(focusablesTempList.size()); 4936 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4937 if (mAttachInfo != null) { 4938 focusablesTempList.clear(); 4939 } 4940 } break; 4941 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 4942 CharSequence text = getIterableTextForAccessibility(); 4943 if (text != null && text.length() > 0) { 4944 event.setFromIndex(getAccessibilitySelectionStart()); 4945 event.setToIndex(getAccessibilitySelectionEnd()); 4946 event.setItemCount(text.length()); 4947 } 4948 } break; 4949 } 4950 } 4951 4952 /** 4953 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4954 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4955 * This method is responsible for obtaining an accessibility node info from a 4956 * pool of reusable instances and calling 4957 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4958 * initialize the former. 4959 * <p> 4960 * Note: The client is responsible for recycling the obtained instance by calling 4961 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4962 * </p> 4963 * 4964 * @return A populated {@link AccessibilityNodeInfo}. 4965 * 4966 * @see AccessibilityNodeInfo 4967 */ 4968 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4969 if (mAccessibilityDelegate != null) { 4970 return mAccessibilityDelegate.createAccessibilityNodeInfo(this); 4971 } else { 4972 return createAccessibilityNodeInfoInternal(); 4973 } 4974 } 4975 4976 /** 4977 * @see #createAccessibilityNodeInfo() 4978 */ 4979 AccessibilityNodeInfo createAccessibilityNodeInfoInternal() { 4980 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4981 if (provider != null) { 4982 return provider.createAccessibilityNodeInfo(View.NO_ID); 4983 } else { 4984 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4985 onInitializeAccessibilityNodeInfo(info); 4986 return info; 4987 } 4988 } 4989 4990 /** 4991 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4992 * The base implementation sets: 4993 * <ul> 4994 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4995 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4996 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4997 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4998 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4999 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 5000 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 5001 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 5002 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 5003 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 5004 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 5005 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 5006 * </ul> 5007 * <p> 5008 * Subclasses should override this method, call the super implementation, 5009 * and set additional attributes. 5010 * </p> 5011 * <p> 5012 * If an {@link AccessibilityDelegate} has been specified via calling 5013 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5014 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 5015 * is responsible for handling this call. 5016 * </p> 5017 * 5018 * @param info The instance to initialize. 5019 */ 5020 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 5021 if (mAccessibilityDelegate != null) { 5022 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 5023 } else { 5024 onInitializeAccessibilityNodeInfoInternal(info); 5025 } 5026 } 5027 5028 /** 5029 * Gets the location of this view in screen coordintates. 5030 * 5031 * @param outRect The output location 5032 */ 5033 void getBoundsOnScreen(Rect outRect) { 5034 if (mAttachInfo == null) { 5035 return; 5036 } 5037 5038 RectF position = mAttachInfo.mTmpTransformRect; 5039 position.set(0, 0, mRight - mLeft, mBottom - mTop); 5040 5041 if (!hasIdentityMatrix()) { 5042 getMatrix().mapRect(position); 5043 } 5044 5045 position.offset(mLeft, mTop); 5046 5047 ViewParent parent = mParent; 5048 while (parent instanceof View) { 5049 View parentView = (View) parent; 5050 5051 position.offset(-parentView.mScrollX, -parentView.mScrollY); 5052 5053 if (!parentView.hasIdentityMatrix()) { 5054 parentView.getMatrix().mapRect(position); 5055 } 5056 5057 position.offset(parentView.mLeft, parentView.mTop); 5058 5059 parent = parentView.mParent; 5060 } 5061 5062 if (parent instanceof ViewRootImpl) { 5063 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5064 position.offset(0, -viewRootImpl.mCurScrollY); 5065 } 5066 5067 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5068 5069 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5070 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5071 } 5072 5073 /** 5074 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5075 * 5076 * Note: Called from the default {@link AccessibilityDelegate}. 5077 */ 5078 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5079 Rect bounds = mAttachInfo.mTmpInvalRect; 5080 5081 getDrawingRect(bounds); 5082 info.setBoundsInParent(bounds); 5083 5084 getBoundsOnScreen(bounds); 5085 info.setBoundsInScreen(bounds); 5086 5087 ViewParent parent = getParentForAccessibility(); 5088 if (parent instanceof View) { 5089 info.setParent((View) parent); 5090 } 5091 5092 if (mID != View.NO_ID) { 5093 View rootView = getRootView(); 5094 if (rootView == null) { 5095 rootView = this; 5096 } 5097 View label = rootView.findLabelForView(this, mID); 5098 if (label != null) { 5099 info.setLabeledBy(label); 5100 } 5101 5102 if ((mAttachInfo.mAccessibilityFetchFlags 5103 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 5104 && Resources.resourceHasPackage(mID)) { 5105 try { 5106 String viewId = getResources().getResourceName(mID); 5107 info.setViewIdResourceName(viewId); 5108 } catch (Resources.NotFoundException nfe) { 5109 /* ignore */ 5110 } 5111 } 5112 } 5113 5114 if (mLabelForId != View.NO_ID) { 5115 View rootView = getRootView(); 5116 if (rootView == null) { 5117 rootView = this; 5118 } 5119 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5120 if (labeled != null) { 5121 info.setLabelFor(labeled); 5122 } 5123 } 5124 5125 info.setVisibleToUser(isVisibleToUser()); 5126 5127 info.setPackageName(mContext.getPackageName()); 5128 info.setClassName(View.class.getName()); 5129 info.setContentDescription(getContentDescription()); 5130 5131 info.setEnabled(isEnabled()); 5132 info.setClickable(isClickable()); 5133 info.setFocusable(isFocusable()); 5134 info.setFocused(isFocused()); 5135 info.setAccessibilityFocused(isAccessibilityFocused()); 5136 info.setSelected(isSelected()); 5137 info.setLongClickable(isLongClickable()); 5138 5139 // TODO: These make sense only if we are in an AdapterView but all 5140 // views can be selected. Maybe from accessibility perspective 5141 // we should report as selectable view in an AdapterView. 5142 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5143 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5144 5145 if (isFocusable()) { 5146 if (isFocused()) { 5147 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5148 } else { 5149 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5150 } 5151 } 5152 5153 if (!isAccessibilityFocused()) { 5154 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5155 } else { 5156 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5157 } 5158 5159 if (isClickable() && isEnabled()) { 5160 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5161 } 5162 5163 if (isLongClickable() && isEnabled()) { 5164 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5165 } 5166 5167 CharSequence text = getIterableTextForAccessibility(); 5168 if (text != null && text.length() > 0) { 5169 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5170 5171 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5172 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5173 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5174 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5175 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5176 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5177 } 5178 } 5179 5180 private View findLabelForView(View view, int labeledId) { 5181 if (mMatchLabelForPredicate == null) { 5182 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5183 } 5184 mMatchLabelForPredicate.mLabeledId = labeledId; 5185 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5186 } 5187 5188 /** 5189 * Computes whether this view is visible to the user. Such a view is 5190 * attached, visible, all its predecessors are visible, it is not clipped 5191 * entirely by its predecessors, and has an alpha greater than zero. 5192 * 5193 * @return Whether the view is visible on the screen. 5194 * 5195 * @hide 5196 */ 5197 protected boolean isVisibleToUser() { 5198 return isVisibleToUser(null); 5199 } 5200 5201 /** 5202 * Computes whether the given portion of this view is visible to the user. 5203 * Such a view is attached, visible, all its predecessors are visible, 5204 * has an alpha greater than zero, and the specified portion is not 5205 * clipped entirely by its predecessors. 5206 * 5207 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5208 * <code>null</code>, and the entire view will be tested in this case. 5209 * When <code>true</code> is returned by the function, the actual visible 5210 * region will be stored in this parameter; that is, if boundInView is fully 5211 * contained within the view, no modification will be made, otherwise regions 5212 * outside of the visible area of the view will be clipped. 5213 * 5214 * @return Whether the specified portion of the view is visible on the screen. 5215 * 5216 * @hide 5217 */ 5218 protected boolean isVisibleToUser(Rect boundInView) { 5219 if (mAttachInfo != null) { 5220 // Attached to invisible window means this view is not visible. 5221 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5222 return false; 5223 } 5224 // An invisible predecessor or one with alpha zero means 5225 // that this view is not visible to the user. 5226 Object current = this; 5227 while (current instanceof View) { 5228 View view = (View) current; 5229 // We have attach info so this view is attached and there is no 5230 // need to check whether we reach to ViewRootImpl on the way up. 5231 if (view.getAlpha() <= 0 || view.getVisibility() != VISIBLE) { 5232 return false; 5233 } 5234 current = view.mParent; 5235 } 5236 // Check if the view is entirely covered by its predecessors. 5237 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5238 Point offset = mAttachInfo.mPoint; 5239 if (!getGlobalVisibleRect(visibleRect, offset)) { 5240 return false; 5241 } 5242 // Check if the visible portion intersects the rectangle of interest. 5243 if (boundInView != null) { 5244 visibleRect.offset(-offset.x, -offset.y); 5245 return boundInView.intersect(visibleRect); 5246 } 5247 return true; 5248 } 5249 return false; 5250 } 5251 5252 /** 5253 * Returns the delegate for implementing accessibility support via 5254 * composition. For more details see {@link AccessibilityDelegate}. 5255 * 5256 * @return The delegate, or null if none set. 5257 * 5258 * @hide 5259 */ 5260 public AccessibilityDelegate getAccessibilityDelegate() { 5261 return mAccessibilityDelegate; 5262 } 5263 5264 /** 5265 * Sets a delegate for implementing accessibility support via composition as 5266 * opposed to inheritance. The delegate's primary use is for implementing 5267 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5268 * 5269 * @param delegate The delegate instance. 5270 * 5271 * @see AccessibilityDelegate 5272 */ 5273 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5274 mAccessibilityDelegate = delegate; 5275 } 5276 5277 /** 5278 * Gets the provider for managing a virtual view hierarchy rooted at this View 5279 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5280 * that explore the window content. 5281 * <p> 5282 * If this method returns an instance, this instance is responsible for managing 5283 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5284 * View including the one representing the View itself. Similarly the returned 5285 * instance is responsible for performing accessibility actions on any virtual 5286 * view or the root view itself. 5287 * </p> 5288 * <p> 5289 * If an {@link AccessibilityDelegate} has been specified via calling 5290 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5291 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5292 * is responsible for handling this call. 5293 * </p> 5294 * 5295 * @return The provider. 5296 * 5297 * @see AccessibilityNodeProvider 5298 */ 5299 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5300 if (mAccessibilityDelegate != null) { 5301 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5302 } else { 5303 return null; 5304 } 5305 } 5306 5307 /** 5308 * Gets the unique identifier of this view on the screen for accessibility purposes. 5309 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5310 * 5311 * @return The view accessibility id. 5312 * 5313 * @hide 5314 */ 5315 public int getAccessibilityViewId() { 5316 if (mAccessibilityViewId == NO_ID) { 5317 mAccessibilityViewId = sNextAccessibilityViewId++; 5318 } 5319 return mAccessibilityViewId; 5320 } 5321 5322 /** 5323 * Gets the unique identifier of the window in which this View reseides. 5324 * 5325 * @return The window accessibility id. 5326 * 5327 * @hide 5328 */ 5329 public int getAccessibilityWindowId() { 5330 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5331 } 5332 5333 /** 5334 * Gets the {@link View} description. It briefly describes the view and is 5335 * primarily used for accessibility support. Set this property to enable 5336 * better accessibility support for your application. This is especially 5337 * true for views that do not have textual representation (For example, 5338 * ImageButton). 5339 * 5340 * @return The content description. 5341 * 5342 * @attr ref android.R.styleable#View_contentDescription 5343 */ 5344 @ViewDebug.ExportedProperty(category = "accessibility") 5345 public CharSequence getContentDescription() { 5346 return mContentDescription; 5347 } 5348 5349 /** 5350 * Sets the {@link View} description. It briefly describes the view and is 5351 * primarily used for accessibility support. Set this property to enable 5352 * better accessibility support for your application. This is especially 5353 * true for views that do not have textual representation (For example, 5354 * ImageButton). 5355 * 5356 * @param contentDescription The content description. 5357 * 5358 * @attr ref android.R.styleable#View_contentDescription 5359 */ 5360 @RemotableViewMethod 5361 public void setContentDescription(CharSequence contentDescription) { 5362 if (mContentDescription == null) { 5363 if (contentDescription == null) { 5364 return; 5365 } 5366 } else if (mContentDescription.equals(contentDescription)) { 5367 return; 5368 } 5369 mContentDescription = contentDescription; 5370 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5371 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5372 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5373 notifySubtreeAccessibilityStateChangedIfNeeded(); 5374 } else { 5375 notifyViewAccessibilityStateChangedIfNeeded(); 5376 } 5377 } 5378 5379 /** 5380 * Gets the id of a view for which this view serves as a label for 5381 * accessibility purposes. 5382 * 5383 * @return The labeled view id. 5384 */ 5385 @ViewDebug.ExportedProperty(category = "accessibility") 5386 public int getLabelFor() { 5387 return mLabelForId; 5388 } 5389 5390 /** 5391 * Sets the id of a view for which this view serves as a label for 5392 * accessibility purposes. 5393 * 5394 * @param id The labeled view id. 5395 */ 5396 @RemotableViewMethod 5397 public void setLabelFor(int id) { 5398 mLabelForId = id; 5399 if (mLabelForId != View.NO_ID 5400 && mID == View.NO_ID) { 5401 mID = generateViewId(); 5402 } 5403 } 5404 5405 /** 5406 * Invoked whenever this view loses focus, either by losing window focus or by losing 5407 * focus within its window. This method can be used to clear any state tied to the 5408 * focus. For instance, if a button is held pressed with the trackball and the window 5409 * loses focus, this method can be used to cancel the press. 5410 * 5411 * Subclasses of View overriding this method should always call super.onFocusLost(). 5412 * 5413 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5414 * @see #onWindowFocusChanged(boolean) 5415 * 5416 * @hide pending API council approval 5417 */ 5418 protected void onFocusLost() { 5419 resetPressedState(); 5420 } 5421 5422 private void resetPressedState() { 5423 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5424 return; 5425 } 5426 5427 if (isPressed()) { 5428 setPressed(false); 5429 5430 if (!mHasPerformedLongPress) { 5431 removeLongPressCallback(); 5432 } 5433 } 5434 } 5435 5436 /** 5437 * Returns true if this view has focus 5438 * 5439 * @return True if this view has focus, false otherwise. 5440 */ 5441 @ViewDebug.ExportedProperty(category = "focus") 5442 public boolean isFocused() { 5443 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5444 } 5445 5446 /** 5447 * Find the view in the hierarchy rooted at this view that currently has 5448 * focus. 5449 * 5450 * @return The view that currently has focus, or null if no focused view can 5451 * be found. 5452 */ 5453 public View findFocus() { 5454 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5455 } 5456 5457 /** 5458 * Indicates whether this view is one of the set of scrollable containers in 5459 * its window. 5460 * 5461 * @return whether this view is one of the set of scrollable containers in 5462 * its window 5463 * 5464 * @attr ref android.R.styleable#View_isScrollContainer 5465 */ 5466 public boolean isScrollContainer() { 5467 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5468 } 5469 5470 /** 5471 * Change whether this view is one of the set of scrollable containers in 5472 * its window. This will be used to determine whether the window can 5473 * resize or must pan when a soft input area is open -- scrollable 5474 * containers allow the window to use resize mode since the container 5475 * will appropriately shrink. 5476 * 5477 * @attr ref android.R.styleable#View_isScrollContainer 5478 */ 5479 public void setScrollContainer(boolean isScrollContainer) { 5480 if (isScrollContainer) { 5481 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5482 mAttachInfo.mScrollContainers.add(this); 5483 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5484 } 5485 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5486 } else { 5487 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5488 mAttachInfo.mScrollContainers.remove(this); 5489 } 5490 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5491 } 5492 } 5493 5494 /** 5495 * Returns the quality of the drawing cache. 5496 * 5497 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5498 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5499 * 5500 * @see #setDrawingCacheQuality(int) 5501 * @see #setDrawingCacheEnabled(boolean) 5502 * @see #isDrawingCacheEnabled() 5503 * 5504 * @attr ref android.R.styleable#View_drawingCacheQuality 5505 */ 5506 public int getDrawingCacheQuality() { 5507 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5508 } 5509 5510 /** 5511 * Set the drawing cache quality of this view. This value is used only when the 5512 * drawing cache is enabled 5513 * 5514 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5515 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5516 * 5517 * @see #getDrawingCacheQuality() 5518 * @see #setDrawingCacheEnabled(boolean) 5519 * @see #isDrawingCacheEnabled() 5520 * 5521 * @attr ref android.R.styleable#View_drawingCacheQuality 5522 */ 5523 public void setDrawingCacheQuality(int quality) { 5524 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5525 } 5526 5527 /** 5528 * Returns whether the screen should remain on, corresponding to the current 5529 * value of {@link #KEEP_SCREEN_ON}. 5530 * 5531 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5532 * 5533 * @see #setKeepScreenOn(boolean) 5534 * 5535 * @attr ref android.R.styleable#View_keepScreenOn 5536 */ 5537 public boolean getKeepScreenOn() { 5538 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5539 } 5540 5541 /** 5542 * Controls whether the screen should remain on, modifying the 5543 * value of {@link #KEEP_SCREEN_ON}. 5544 * 5545 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5546 * 5547 * @see #getKeepScreenOn() 5548 * 5549 * @attr ref android.R.styleable#View_keepScreenOn 5550 */ 5551 public void setKeepScreenOn(boolean keepScreenOn) { 5552 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5553 } 5554 5555 /** 5556 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5557 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5558 * 5559 * @attr ref android.R.styleable#View_nextFocusLeft 5560 */ 5561 public int getNextFocusLeftId() { 5562 return mNextFocusLeftId; 5563 } 5564 5565 /** 5566 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5567 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5568 * decide automatically. 5569 * 5570 * @attr ref android.R.styleable#View_nextFocusLeft 5571 */ 5572 public void setNextFocusLeftId(int nextFocusLeftId) { 5573 mNextFocusLeftId = nextFocusLeftId; 5574 } 5575 5576 /** 5577 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5578 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5579 * 5580 * @attr ref android.R.styleable#View_nextFocusRight 5581 */ 5582 public int getNextFocusRightId() { 5583 return mNextFocusRightId; 5584 } 5585 5586 /** 5587 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5588 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5589 * decide automatically. 5590 * 5591 * @attr ref android.R.styleable#View_nextFocusRight 5592 */ 5593 public void setNextFocusRightId(int nextFocusRightId) { 5594 mNextFocusRightId = nextFocusRightId; 5595 } 5596 5597 /** 5598 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5599 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5600 * 5601 * @attr ref android.R.styleable#View_nextFocusUp 5602 */ 5603 public int getNextFocusUpId() { 5604 return mNextFocusUpId; 5605 } 5606 5607 /** 5608 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5609 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5610 * decide automatically. 5611 * 5612 * @attr ref android.R.styleable#View_nextFocusUp 5613 */ 5614 public void setNextFocusUpId(int nextFocusUpId) { 5615 mNextFocusUpId = nextFocusUpId; 5616 } 5617 5618 /** 5619 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5620 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5621 * 5622 * @attr ref android.R.styleable#View_nextFocusDown 5623 */ 5624 public int getNextFocusDownId() { 5625 return mNextFocusDownId; 5626 } 5627 5628 /** 5629 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5630 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5631 * decide automatically. 5632 * 5633 * @attr ref android.R.styleable#View_nextFocusDown 5634 */ 5635 public void setNextFocusDownId(int nextFocusDownId) { 5636 mNextFocusDownId = nextFocusDownId; 5637 } 5638 5639 /** 5640 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5641 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5642 * 5643 * @attr ref android.R.styleable#View_nextFocusForward 5644 */ 5645 public int getNextFocusForwardId() { 5646 return mNextFocusForwardId; 5647 } 5648 5649 /** 5650 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5651 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5652 * decide automatically. 5653 * 5654 * @attr ref android.R.styleable#View_nextFocusForward 5655 */ 5656 public void setNextFocusForwardId(int nextFocusForwardId) { 5657 mNextFocusForwardId = nextFocusForwardId; 5658 } 5659 5660 /** 5661 * Returns the visibility of this view and all of its ancestors 5662 * 5663 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5664 */ 5665 public boolean isShown() { 5666 View current = this; 5667 //noinspection ConstantConditions 5668 do { 5669 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5670 return false; 5671 } 5672 ViewParent parent = current.mParent; 5673 if (parent == null) { 5674 return false; // We are not attached to the view root 5675 } 5676 if (!(parent instanceof View)) { 5677 return true; 5678 } 5679 current = (View) parent; 5680 } while (current != null); 5681 5682 return false; 5683 } 5684 5685 /** 5686 * Called by the view hierarchy when the content insets for a window have 5687 * changed, to allow it to adjust its content to fit within those windows. 5688 * The content insets tell you the space that the status bar, input method, 5689 * and other system windows infringe on the application's window. 5690 * 5691 * <p>You do not normally need to deal with this function, since the default 5692 * window decoration given to applications takes care of applying it to the 5693 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5694 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5695 * and your content can be placed under those system elements. You can then 5696 * use this method within your view hierarchy if you have parts of your UI 5697 * which you would like to ensure are not being covered. 5698 * 5699 * <p>The default implementation of this method simply applies the content 5700 * insets to the view's padding, consuming that content (modifying the 5701 * insets to be 0), and returning true. This behavior is off by default, but can 5702 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5703 * 5704 * <p>This function's traversal down the hierarchy is depth-first. The same content 5705 * insets object is propagated down the hierarchy, so any changes made to it will 5706 * be seen by all following views (including potentially ones above in 5707 * the hierarchy since this is a depth-first traversal). The first view 5708 * that returns true will abort the entire traversal. 5709 * 5710 * <p>The default implementation works well for a situation where it is 5711 * used with a container that covers the entire window, allowing it to 5712 * apply the appropriate insets to its content on all edges. If you need 5713 * a more complicated layout (such as two different views fitting system 5714 * windows, one on the top of the window, and one on the bottom), 5715 * you can override the method and handle the insets however you would like. 5716 * Note that the insets provided by the framework are always relative to the 5717 * far edges of the window, not accounting for the location of the called view 5718 * within that window. (In fact when this method is called you do not yet know 5719 * where the layout will place the view, as it is done before layout happens.) 5720 * 5721 * <p>Note: unlike many View methods, there is no dispatch phase to this 5722 * call. If you are overriding it in a ViewGroup and want to allow the 5723 * call to continue to your children, you must be sure to call the super 5724 * implementation. 5725 * 5726 * <p>Here is a sample layout that makes use of fitting system windows 5727 * to have controls for a video view placed inside of the window decorations 5728 * that it hides and shows. This can be used with code like the second 5729 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5730 * 5731 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5732 * 5733 * @param insets Current content insets of the window. Prior to 5734 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5735 * the insets or else you and Android will be unhappy. 5736 * 5737 * @return {@code true} if this view applied the insets and it should not 5738 * continue propagating further down the hierarchy, {@code false} otherwise. 5739 * @see #getFitsSystemWindows() 5740 * @see #setFitsSystemWindows(boolean) 5741 * @see #setSystemUiVisibility(int) 5742 */ 5743 protected boolean fitSystemWindows(Rect insets) { 5744 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5745 mUserPaddingStart = UNDEFINED_PADDING; 5746 mUserPaddingEnd = UNDEFINED_PADDING; 5747 Rect localInsets = sThreadLocal.get(); 5748 if (localInsets == null) { 5749 localInsets = new Rect(); 5750 sThreadLocal.set(localInsets); 5751 } 5752 boolean res = computeFitSystemWindows(insets, localInsets); 5753 internalSetPadding(localInsets.left, localInsets.top, 5754 localInsets.right, localInsets.bottom); 5755 return res; 5756 } 5757 return false; 5758 } 5759 5760 /** 5761 * @hide Compute the insets that should be consumed by this view and the ones 5762 * that should propagate to those under it. 5763 */ 5764 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 5765 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5766 || mAttachInfo == null 5767 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 5768 && !mAttachInfo.mOverscanRequested)) { 5769 outLocalInsets.set(inoutInsets); 5770 inoutInsets.set(0, 0, 0, 0); 5771 return true; 5772 } else { 5773 // The application wants to take care of fitting system window for 5774 // the content... however we still need to take care of any overscan here. 5775 final Rect overscan = mAttachInfo.mOverscanInsets; 5776 outLocalInsets.set(overscan); 5777 inoutInsets.left -= overscan.left; 5778 inoutInsets.top -= overscan.top; 5779 inoutInsets.right -= overscan.right; 5780 inoutInsets.bottom -= overscan.bottom; 5781 return false; 5782 } 5783 } 5784 5785 /** 5786 * Sets whether or not this view should account for system screen decorations 5787 * such as the status bar and inset its content; that is, controlling whether 5788 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5789 * executed. See that method for more details. 5790 * 5791 * <p>Note that if you are providing your own implementation of 5792 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5793 * flag to true -- your implementation will be overriding the default 5794 * implementation that checks this flag. 5795 * 5796 * @param fitSystemWindows If true, then the default implementation of 5797 * {@link #fitSystemWindows(Rect)} will be executed. 5798 * 5799 * @attr ref android.R.styleable#View_fitsSystemWindows 5800 * @see #getFitsSystemWindows() 5801 * @see #fitSystemWindows(Rect) 5802 * @see #setSystemUiVisibility(int) 5803 */ 5804 public void setFitsSystemWindows(boolean fitSystemWindows) { 5805 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5806 } 5807 5808 /** 5809 * Check for state of {@link #setFitsSystemWindows(boolean)}. If this method 5810 * returns {@code true}, the default implementation of {@link #fitSystemWindows(Rect)} 5811 * will be executed. 5812 * 5813 * @return {@code true} if the default implementation of 5814 * {@link #fitSystemWindows(Rect)} will be executed. 5815 * 5816 * @attr ref android.R.styleable#View_fitsSystemWindows 5817 * @see #setFitsSystemWindows(boolean) 5818 * @see #fitSystemWindows(Rect) 5819 * @see #setSystemUiVisibility(int) 5820 */ 5821 public boolean getFitsSystemWindows() { 5822 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5823 } 5824 5825 /** @hide */ 5826 public boolean fitsSystemWindows() { 5827 return getFitsSystemWindows(); 5828 } 5829 5830 /** 5831 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5832 */ 5833 public void requestFitSystemWindows() { 5834 if (mParent != null) { 5835 mParent.requestFitSystemWindows(); 5836 } 5837 } 5838 5839 /** 5840 * For use by PhoneWindow to make its own system window fitting optional. 5841 * @hide 5842 */ 5843 public void makeOptionalFitsSystemWindows() { 5844 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5845 } 5846 5847 /** 5848 * Returns the visibility status for this view. 5849 * 5850 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5851 * @attr ref android.R.styleable#View_visibility 5852 */ 5853 @ViewDebug.ExportedProperty(mapping = { 5854 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5855 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5856 @ViewDebug.IntToString(from = GONE, to = "GONE") 5857 }) 5858 public int getVisibility() { 5859 return mViewFlags & VISIBILITY_MASK; 5860 } 5861 5862 /** 5863 * Set the enabled state of this view. 5864 * 5865 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5866 * @attr ref android.R.styleable#View_visibility 5867 */ 5868 @RemotableViewMethod 5869 public void setVisibility(int visibility) { 5870 setFlags(visibility, VISIBILITY_MASK); 5871 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5872 } 5873 5874 /** 5875 * Returns the enabled status for this view. The interpretation of the 5876 * enabled state varies by subclass. 5877 * 5878 * @return True if this view is enabled, false otherwise. 5879 */ 5880 @ViewDebug.ExportedProperty 5881 public boolean isEnabled() { 5882 return (mViewFlags & ENABLED_MASK) == ENABLED; 5883 } 5884 5885 /** 5886 * Set the enabled state of this view. The interpretation of the enabled 5887 * state varies by subclass. 5888 * 5889 * @param enabled True if this view is enabled, false otherwise. 5890 */ 5891 @RemotableViewMethod 5892 public void setEnabled(boolean enabled) { 5893 if (enabled == isEnabled()) return; 5894 5895 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5896 5897 /* 5898 * The View most likely has to change its appearance, so refresh 5899 * the drawable state. 5900 */ 5901 refreshDrawableState(); 5902 5903 // Invalidate too, since the default behavior for views is to be 5904 // be drawn at 50% alpha rather than to change the drawable. 5905 invalidate(true); 5906 } 5907 5908 /** 5909 * Set whether this view can receive the focus. 5910 * 5911 * Setting this to false will also ensure that this view is not focusable 5912 * in touch mode. 5913 * 5914 * @param focusable If true, this view can receive the focus. 5915 * 5916 * @see #setFocusableInTouchMode(boolean) 5917 * @attr ref android.R.styleable#View_focusable 5918 */ 5919 public void setFocusable(boolean focusable) { 5920 if (!focusable) { 5921 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5922 } 5923 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5924 } 5925 5926 /** 5927 * Set whether this view can receive focus while in touch mode. 5928 * 5929 * Setting this to true will also ensure that this view is focusable. 5930 * 5931 * @param focusableInTouchMode If true, this view can receive the focus while 5932 * in touch mode. 5933 * 5934 * @see #setFocusable(boolean) 5935 * @attr ref android.R.styleable#View_focusableInTouchMode 5936 */ 5937 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5938 // Focusable in touch mode should always be set before the focusable flag 5939 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5940 // which, in touch mode, will not successfully request focus on this view 5941 // because the focusable in touch mode flag is not set 5942 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5943 if (focusableInTouchMode) { 5944 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5945 } 5946 } 5947 5948 /** 5949 * Set whether this view should have sound effects enabled for events such as 5950 * clicking and touching. 5951 * 5952 * <p>You may wish to disable sound effects for a view if you already play sounds, 5953 * for instance, a dial key that plays dtmf tones. 5954 * 5955 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5956 * @see #isSoundEffectsEnabled() 5957 * @see #playSoundEffect(int) 5958 * @attr ref android.R.styleable#View_soundEffectsEnabled 5959 */ 5960 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5961 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5962 } 5963 5964 /** 5965 * @return whether this view should have sound effects enabled for events such as 5966 * clicking and touching. 5967 * 5968 * @see #setSoundEffectsEnabled(boolean) 5969 * @see #playSoundEffect(int) 5970 * @attr ref android.R.styleable#View_soundEffectsEnabled 5971 */ 5972 @ViewDebug.ExportedProperty 5973 public boolean isSoundEffectsEnabled() { 5974 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5975 } 5976 5977 /** 5978 * Set whether this view should have haptic feedback for events such as 5979 * long presses. 5980 * 5981 * <p>You may wish to disable haptic feedback if your view already controls 5982 * its own haptic feedback. 5983 * 5984 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5985 * @see #isHapticFeedbackEnabled() 5986 * @see #performHapticFeedback(int) 5987 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5988 */ 5989 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5990 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5991 } 5992 5993 /** 5994 * @return whether this view should have haptic feedback enabled for events 5995 * long presses. 5996 * 5997 * @see #setHapticFeedbackEnabled(boolean) 5998 * @see #performHapticFeedback(int) 5999 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 6000 */ 6001 @ViewDebug.ExportedProperty 6002 public boolean isHapticFeedbackEnabled() { 6003 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 6004 } 6005 6006 /** 6007 * Returns the layout direction for this view. 6008 * 6009 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 6010 * {@link #LAYOUT_DIRECTION_RTL}, 6011 * {@link #LAYOUT_DIRECTION_INHERIT} or 6012 * {@link #LAYOUT_DIRECTION_LOCALE}. 6013 * 6014 * @attr ref android.R.styleable#View_layoutDirection 6015 * 6016 * @hide 6017 */ 6018 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6019 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 6020 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 6021 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 6022 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 6023 }) 6024 public int getRawLayoutDirection() { 6025 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 6026 } 6027 6028 /** 6029 * Set the layout direction for this view. This will propagate a reset of layout direction 6030 * resolution to the view's children and resolve layout direction for this view. 6031 * 6032 * @param layoutDirection the layout direction to set. Should be one of: 6033 * 6034 * {@link #LAYOUT_DIRECTION_LTR}, 6035 * {@link #LAYOUT_DIRECTION_RTL}, 6036 * {@link #LAYOUT_DIRECTION_INHERIT}, 6037 * {@link #LAYOUT_DIRECTION_LOCALE}. 6038 * 6039 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 6040 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 6041 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 6042 * 6043 * @attr ref android.R.styleable#View_layoutDirection 6044 */ 6045 @RemotableViewMethod 6046 public void setLayoutDirection(int layoutDirection) { 6047 if (getRawLayoutDirection() != layoutDirection) { 6048 // Reset the current layout direction and the resolved one 6049 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 6050 resetRtlProperties(); 6051 // Set the new layout direction (filtered) 6052 mPrivateFlags2 |= 6053 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 6054 // We need to resolve all RTL properties as they all depend on layout direction 6055 resolveRtlPropertiesIfNeeded(); 6056 requestLayout(); 6057 invalidate(true); 6058 } 6059 } 6060 6061 /** 6062 * Returns the resolved layout direction for this view. 6063 * 6064 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6065 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6066 * 6067 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6068 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6069 * 6070 * @attr ref android.R.styleable#View_layoutDirection 6071 */ 6072 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6073 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6074 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6075 }) 6076 public int getLayoutDirection() { 6077 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6078 if (targetSdkVersion < JELLY_BEAN_MR1) { 6079 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6080 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6081 } 6082 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6083 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6084 } 6085 6086 /** 6087 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6088 * layout attribute and/or the inherited value from the parent 6089 * 6090 * @return true if the layout is right-to-left. 6091 * 6092 * @hide 6093 */ 6094 @ViewDebug.ExportedProperty(category = "layout") 6095 public boolean isLayoutRtl() { 6096 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6097 } 6098 6099 /** 6100 * Indicates whether the view is currently tracking transient state that the 6101 * app should not need to concern itself with saving and restoring, but that 6102 * the framework should take special note to preserve when possible. 6103 * 6104 * <p>A view with transient state cannot be trivially rebound from an external 6105 * data source, such as an adapter binding item views in a list. This may be 6106 * because the view is performing an animation, tracking user selection 6107 * of content, or similar.</p> 6108 * 6109 * @return true if the view has transient state 6110 */ 6111 @ViewDebug.ExportedProperty(category = "layout") 6112 public boolean hasTransientState() { 6113 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6114 } 6115 6116 /** 6117 * Set whether this view is currently tracking transient state that the 6118 * framework should attempt to preserve when possible. This flag is reference counted, 6119 * so every call to setHasTransientState(true) should be paired with a later call 6120 * to setHasTransientState(false). 6121 * 6122 * <p>A view with transient state cannot be trivially rebound from an external 6123 * data source, such as an adapter binding item views in a list. This may be 6124 * because the view is performing an animation, tracking user selection 6125 * of content, or similar.</p> 6126 * 6127 * @param hasTransientState true if this view has transient state 6128 */ 6129 public void setHasTransientState(boolean hasTransientState) { 6130 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6131 mTransientStateCount - 1; 6132 if (mTransientStateCount < 0) { 6133 mTransientStateCount = 0; 6134 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6135 "unmatched pair of setHasTransientState calls"); 6136 } else if ((hasTransientState && mTransientStateCount == 1) || 6137 (!hasTransientState && mTransientStateCount == 0)) { 6138 // update flag if we've just incremented up from 0 or decremented down to 0 6139 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6140 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6141 if (mParent != null) { 6142 try { 6143 mParent.childHasTransientStateChanged(this, hasTransientState); 6144 } catch (AbstractMethodError e) { 6145 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6146 " does not fully implement ViewParent", e); 6147 } 6148 } 6149 } 6150 } 6151 6152 /** 6153 * Returns true if this view is currently attached to a window. 6154 */ 6155 public boolean isAttachedToWindow() { 6156 return mAttachInfo != null; 6157 } 6158 6159 /** 6160 * Returns true if this view has been through at least one layout since it 6161 * was last attached to or detached from a window. 6162 */ 6163 public boolean isLaidOut() { 6164 return (mPrivateFlags3 & PFLAG3_IS_LAID_OUT) == PFLAG3_IS_LAID_OUT; 6165 } 6166 6167 /** 6168 * If this view doesn't do any drawing on its own, set this flag to 6169 * allow further optimizations. By default, this flag is not set on 6170 * View, but could be set on some View subclasses such as ViewGroup. 6171 * 6172 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6173 * you should clear this flag. 6174 * 6175 * @param willNotDraw whether or not this View draw on its own 6176 */ 6177 public void setWillNotDraw(boolean willNotDraw) { 6178 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6179 } 6180 6181 /** 6182 * Returns whether or not this View draws on its own. 6183 * 6184 * @return true if this view has nothing to draw, false otherwise 6185 */ 6186 @ViewDebug.ExportedProperty(category = "drawing") 6187 public boolean willNotDraw() { 6188 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 6189 } 6190 6191 /** 6192 * When a View's drawing cache is enabled, drawing is redirected to an 6193 * offscreen bitmap. Some views, like an ImageView, must be able to 6194 * bypass this mechanism if they already draw a single bitmap, to avoid 6195 * unnecessary usage of the memory. 6196 * 6197 * @param willNotCacheDrawing true if this view does not cache its 6198 * drawing, false otherwise 6199 */ 6200 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6201 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6202 } 6203 6204 /** 6205 * Returns whether or not this View can cache its drawing or not. 6206 * 6207 * @return true if this view does not cache its drawing, false otherwise 6208 */ 6209 @ViewDebug.ExportedProperty(category = "drawing") 6210 public boolean willNotCacheDrawing() { 6211 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6212 } 6213 6214 /** 6215 * Indicates whether this view reacts to click events or not. 6216 * 6217 * @return true if the view is clickable, false otherwise 6218 * 6219 * @see #setClickable(boolean) 6220 * @attr ref android.R.styleable#View_clickable 6221 */ 6222 @ViewDebug.ExportedProperty 6223 public boolean isClickable() { 6224 return (mViewFlags & CLICKABLE) == CLICKABLE; 6225 } 6226 6227 /** 6228 * Enables or disables click events for this view. When a view 6229 * is clickable it will change its state to "pressed" on every click. 6230 * Subclasses should set the view clickable to visually react to 6231 * user's clicks. 6232 * 6233 * @param clickable true to make the view clickable, false otherwise 6234 * 6235 * @see #isClickable() 6236 * @attr ref android.R.styleable#View_clickable 6237 */ 6238 public void setClickable(boolean clickable) { 6239 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6240 } 6241 6242 /** 6243 * Indicates whether this view reacts to long click events or not. 6244 * 6245 * @return true if the view is long clickable, false otherwise 6246 * 6247 * @see #setLongClickable(boolean) 6248 * @attr ref android.R.styleable#View_longClickable 6249 */ 6250 public boolean isLongClickable() { 6251 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6252 } 6253 6254 /** 6255 * Enables or disables long click events for this view. When a view is long 6256 * clickable it reacts to the user holding down the button for a longer 6257 * duration than a tap. This event can either launch the listener or a 6258 * context menu. 6259 * 6260 * @param longClickable true to make the view long clickable, false otherwise 6261 * @see #isLongClickable() 6262 * @attr ref android.R.styleable#View_longClickable 6263 */ 6264 public void setLongClickable(boolean longClickable) { 6265 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6266 } 6267 6268 /** 6269 * Sets the pressed state for this view. 6270 * 6271 * @see #isClickable() 6272 * @see #setClickable(boolean) 6273 * 6274 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6275 * the View's internal state from a previously set "pressed" state. 6276 */ 6277 public void setPressed(boolean pressed) { 6278 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6279 6280 if (pressed) { 6281 mPrivateFlags |= PFLAG_PRESSED; 6282 } else { 6283 mPrivateFlags &= ~PFLAG_PRESSED; 6284 } 6285 6286 if (needsRefresh) { 6287 refreshDrawableState(); 6288 } 6289 dispatchSetPressed(pressed); 6290 } 6291 6292 /** 6293 * Dispatch setPressed to all of this View's children. 6294 * 6295 * @see #setPressed(boolean) 6296 * 6297 * @param pressed The new pressed state 6298 */ 6299 protected void dispatchSetPressed(boolean pressed) { 6300 } 6301 6302 /** 6303 * Indicates whether the view is currently in pressed state. Unless 6304 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6305 * the pressed state. 6306 * 6307 * @see #setPressed(boolean) 6308 * @see #isClickable() 6309 * @see #setClickable(boolean) 6310 * 6311 * @return true if the view is currently pressed, false otherwise 6312 */ 6313 public boolean isPressed() { 6314 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6315 } 6316 6317 /** 6318 * Indicates whether this view will save its state (that is, 6319 * whether its {@link #onSaveInstanceState} method will be called). 6320 * 6321 * @return Returns true if the view state saving is enabled, else false. 6322 * 6323 * @see #setSaveEnabled(boolean) 6324 * @attr ref android.R.styleable#View_saveEnabled 6325 */ 6326 public boolean isSaveEnabled() { 6327 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6328 } 6329 6330 /** 6331 * Controls whether the saving of this view's state is 6332 * enabled (that is, whether its {@link #onSaveInstanceState} method 6333 * will be called). Note that even if freezing is enabled, the 6334 * view still must have an id assigned to it (via {@link #setId(int)}) 6335 * for its state to be saved. This flag can only disable the 6336 * saving of this view; any child views may still have their state saved. 6337 * 6338 * @param enabled Set to false to <em>disable</em> state saving, or true 6339 * (the default) to allow it. 6340 * 6341 * @see #isSaveEnabled() 6342 * @see #setId(int) 6343 * @see #onSaveInstanceState() 6344 * @attr ref android.R.styleable#View_saveEnabled 6345 */ 6346 public void setSaveEnabled(boolean enabled) { 6347 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6348 } 6349 6350 /** 6351 * Gets whether the framework should discard touches when the view's 6352 * window is obscured by another visible window. 6353 * Refer to the {@link View} security documentation for more details. 6354 * 6355 * @return True if touch filtering is enabled. 6356 * 6357 * @see #setFilterTouchesWhenObscured(boolean) 6358 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6359 */ 6360 @ViewDebug.ExportedProperty 6361 public boolean getFilterTouchesWhenObscured() { 6362 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6363 } 6364 6365 /** 6366 * Sets whether the framework should discard touches when the view's 6367 * window is obscured by another visible window. 6368 * Refer to the {@link View} security documentation for more details. 6369 * 6370 * @param enabled True if touch filtering should be enabled. 6371 * 6372 * @see #getFilterTouchesWhenObscured 6373 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6374 */ 6375 public void setFilterTouchesWhenObscured(boolean enabled) { 6376 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6377 FILTER_TOUCHES_WHEN_OBSCURED); 6378 } 6379 6380 /** 6381 * Indicates whether the entire hierarchy under this view will save its 6382 * state when a state saving traversal occurs from its parent. The default 6383 * is true; if false, these views will not be saved unless 6384 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6385 * 6386 * @return Returns true if the view state saving from parent is enabled, else false. 6387 * 6388 * @see #setSaveFromParentEnabled(boolean) 6389 */ 6390 public boolean isSaveFromParentEnabled() { 6391 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6392 } 6393 6394 /** 6395 * Controls whether the entire hierarchy under this view will save its 6396 * state when a state saving traversal occurs from its parent. The default 6397 * is true; if false, these views will not be saved unless 6398 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6399 * 6400 * @param enabled Set to false to <em>disable</em> state saving, or true 6401 * (the default) to allow it. 6402 * 6403 * @see #isSaveFromParentEnabled() 6404 * @see #setId(int) 6405 * @see #onSaveInstanceState() 6406 */ 6407 public void setSaveFromParentEnabled(boolean enabled) { 6408 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6409 } 6410 6411 6412 /** 6413 * Returns whether this View is able to take focus. 6414 * 6415 * @return True if this view can take focus, or false otherwise. 6416 * @attr ref android.R.styleable#View_focusable 6417 */ 6418 @ViewDebug.ExportedProperty(category = "focus") 6419 public final boolean isFocusable() { 6420 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6421 } 6422 6423 /** 6424 * When a view is focusable, it may not want to take focus when in touch mode. 6425 * For example, a button would like focus when the user is navigating via a D-pad 6426 * so that the user can click on it, but once the user starts touching the screen, 6427 * the button shouldn't take focus 6428 * @return Whether the view is focusable in touch mode. 6429 * @attr ref android.R.styleable#View_focusableInTouchMode 6430 */ 6431 @ViewDebug.ExportedProperty 6432 public final boolean isFocusableInTouchMode() { 6433 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6434 } 6435 6436 /** 6437 * Find the nearest view in the specified direction that can take focus. 6438 * This does not actually give focus to that view. 6439 * 6440 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6441 * 6442 * @return The nearest focusable in the specified direction, or null if none 6443 * can be found. 6444 */ 6445 public View focusSearch(int direction) { 6446 if (mParent != null) { 6447 return mParent.focusSearch(this, direction); 6448 } else { 6449 return null; 6450 } 6451 } 6452 6453 /** 6454 * This method is the last chance for the focused view and its ancestors to 6455 * respond to an arrow key. This is called when the focused view did not 6456 * consume the key internally, nor could the view system find a new view in 6457 * the requested direction to give focus to. 6458 * 6459 * @param focused The currently focused view. 6460 * @param direction The direction focus wants to move. One of FOCUS_UP, 6461 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6462 * @return True if the this view consumed this unhandled move. 6463 */ 6464 public boolean dispatchUnhandledMove(View focused, int direction) { 6465 return false; 6466 } 6467 6468 /** 6469 * If a user manually specified the next view id for a particular direction, 6470 * use the root to look up the view. 6471 * @param root The root view of the hierarchy containing this view. 6472 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6473 * or FOCUS_BACKWARD. 6474 * @return The user specified next view, or null if there is none. 6475 */ 6476 View findUserSetNextFocus(View root, int direction) { 6477 switch (direction) { 6478 case FOCUS_LEFT: 6479 if (mNextFocusLeftId == View.NO_ID) return null; 6480 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6481 case FOCUS_RIGHT: 6482 if (mNextFocusRightId == View.NO_ID) return null; 6483 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6484 case FOCUS_UP: 6485 if (mNextFocusUpId == View.NO_ID) return null; 6486 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6487 case FOCUS_DOWN: 6488 if (mNextFocusDownId == View.NO_ID) return null; 6489 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6490 case FOCUS_FORWARD: 6491 if (mNextFocusForwardId == View.NO_ID) return null; 6492 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6493 case FOCUS_BACKWARD: { 6494 if (mID == View.NO_ID) return null; 6495 final int id = mID; 6496 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6497 @Override 6498 public boolean apply(View t) { 6499 return t.mNextFocusForwardId == id; 6500 } 6501 }); 6502 } 6503 } 6504 return null; 6505 } 6506 6507 private View findViewInsideOutShouldExist(View root, int id) { 6508 if (mMatchIdPredicate == null) { 6509 mMatchIdPredicate = new MatchIdPredicate(); 6510 } 6511 mMatchIdPredicate.mId = id; 6512 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6513 if (result == null) { 6514 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6515 } 6516 return result; 6517 } 6518 6519 /** 6520 * Find and return all focusable views that are descendants of this view, 6521 * possibly including this view if it is focusable itself. 6522 * 6523 * @param direction The direction of the focus 6524 * @return A list of focusable views 6525 */ 6526 public ArrayList<View> getFocusables(int direction) { 6527 ArrayList<View> result = new ArrayList<View>(24); 6528 addFocusables(result, direction); 6529 return result; 6530 } 6531 6532 /** 6533 * Add any focusable views that are descendants of this view (possibly 6534 * including this view if it is focusable itself) to views. If we are in touch mode, 6535 * only add views that are also focusable in touch mode. 6536 * 6537 * @param views Focusable views found so far 6538 * @param direction The direction of the focus 6539 */ 6540 public void addFocusables(ArrayList<View> views, int direction) { 6541 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6542 } 6543 6544 /** 6545 * Adds any focusable views that are descendants of this view (possibly 6546 * including this view if it is focusable itself) to views. This method 6547 * adds all focusable views regardless if we are in touch mode or 6548 * only views focusable in touch mode if we are in touch mode or 6549 * only views that can take accessibility focus if accessibility is enabeld 6550 * depending on the focusable mode paramater. 6551 * 6552 * @param views Focusable views found so far or null if all we are interested is 6553 * the number of focusables. 6554 * @param direction The direction of the focus. 6555 * @param focusableMode The type of focusables to be added. 6556 * 6557 * @see #FOCUSABLES_ALL 6558 * @see #FOCUSABLES_TOUCH_MODE 6559 */ 6560 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6561 if (views == null) { 6562 return; 6563 } 6564 if (!isFocusable()) { 6565 return; 6566 } 6567 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6568 && isInTouchMode() && !isFocusableInTouchMode()) { 6569 return; 6570 } 6571 views.add(this); 6572 } 6573 6574 /** 6575 * Finds the Views that contain given text. The containment is case insensitive. 6576 * The search is performed by either the text that the View renders or the content 6577 * description that describes the view for accessibility purposes and the view does 6578 * not render or both. Clients can specify how the search is to be performed via 6579 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6580 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6581 * 6582 * @param outViews The output list of matching Views. 6583 * @param searched The text to match against. 6584 * 6585 * @see #FIND_VIEWS_WITH_TEXT 6586 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6587 * @see #setContentDescription(CharSequence) 6588 */ 6589 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6590 if (getAccessibilityNodeProvider() != null) { 6591 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6592 outViews.add(this); 6593 } 6594 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6595 && (searched != null && searched.length() > 0) 6596 && (mContentDescription != null && mContentDescription.length() > 0)) { 6597 String searchedLowerCase = searched.toString().toLowerCase(); 6598 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6599 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6600 outViews.add(this); 6601 } 6602 } 6603 } 6604 6605 /** 6606 * Find and return all touchable views that are descendants of this view, 6607 * possibly including this view if it is touchable itself. 6608 * 6609 * @return A list of touchable views 6610 */ 6611 public ArrayList<View> getTouchables() { 6612 ArrayList<View> result = new ArrayList<View>(); 6613 addTouchables(result); 6614 return result; 6615 } 6616 6617 /** 6618 * Add any touchable views that are descendants of this view (possibly 6619 * including this view if it is touchable itself) to views. 6620 * 6621 * @param views Touchable views found so far 6622 */ 6623 public void addTouchables(ArrayList<View> views) { 6624 final int viewFlags = mViewFlags; 6625 6626 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6627 && (viewFlags & ENABLED_MASK) == ENABLED) { 6628 views.add(this); 6629 } 6630 } 6631 6632 /** 6633 * Returns whether this View is accessibility focused. 6634 * 6635 * @return True if this View is accessibility focused. 6636 */ 6637 boolean isAccessibilityFocused() { 6638 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6639 } 6640 6641 /** 6642 * Call this to try to give accessibility focus to this view. 6643 * 6644 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6645 * returns false or the view is no visible or the view already has accessibility 6646 * focus. 6647 * 6648 * See also {@link #focusSearch(int)}, which is what you call to say that you 6649 * have focus, and you want your parent to look for the next one. 6650 * 6651 * @return Whether this view actually took accessibility focus. 6652 * 6653 * @hide 6654 */ 6655 public boolean requestAccessibilityFocus() { 6656 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6657 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6658 return false; 6659 } 6660 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6661 return false; 6662 } 6663 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6664 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6665 ViewRootImpl viewRootImpl = getViewRootImpl(); 6666 if (viewRootImpl != null) { 6667 viewRootImpl.setAccessibilityFocus(this, null); 6668 } 6669 invalidate(); 6670 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6671 return true; 6672 } 6673 return false; 6674 } 6675 6676 /** 6677 * Call this to try to clear accessibility focus of this view. 6678 * 6679 * See also {@link #focusSearch(int)}, which is what you call to say that you 6680 * have focus, and you want your parent to look for the next one. 6681 * 6682 * @hide 6683 */ 6684 public void clearAccessibilityFocus() { 6685 clearAccessibilityFocusNoCallbacks(); 6686 // Clear the global reference of accessibility focus if this 6687 // view or any of its descendants had accessibility focus. 6688 ViewRootImpl viewRootImpl = getViewRootImpl(); 6689 if (viewRootImpl != null) { 6690 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6691 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6692 viewRootImpl.setAccessibilityFocus(null, null); 6693 } 6694 } 6695 } 6696 6697 private void sendAccessibilityHoverEvent(int eventType) { 6698 // Since we are not delivering to a client accessibility events from not 6699 // important views (unless the clinet request that) we need to fire the 6700 // event from the deepest view exposed to the client. As a consequence if 6701 // the user crosses a not exposed view the client will see enter and exit 6702 // of the exposed predecessor followed by and enter and exit of that same 6703 // predecessor when entering and exiting the not exposed descendant. This 6704 // is fine since the client has a clear idea which view is hovered at the 6705 // price of a couple more events being sent. This is a simple and 6706 // working solution. 6707 View source = this; 6708 while (true) { 6709 if (source.includeForAccessibility()) { 6710 source.sendAccessibilityEvent(eventType); 6711 return; 6712 } 6713 ViewParent parent = source.getParent(); 6714 if (parent instanceof View) { 6715 source = (View) parent; 6716 } else { 6717 return; 6718 } 6719 } 6720 } 6721 6722 /** 6723 * Clears accessibility focus without calling any callback methods 6724 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6725 * is used for clearing accessibility focus when giving this focus to 6726 * another view. 6727 */ 6728 void clearAccessibilityFocusNoCallbacks() { 6729 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6730 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6731 invalidate(); 6732 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6733 } 6734 } 6735 6736 /** 6737 * Call this to try to give focus to a specific view or to one of its 6738 * descendants. 6739 * 6740 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6741 * false), or if it is focusable and it is not focusable in touch mode 6742 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6743 * 6744 * See also {@link #focusSearch(int)}, which is what you call to say that you 6745 * have focus, and you want your parent to look for the next one. 6746 * 6747 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6748 * {@link #FOCUS_DOWN} and <code>null</code>. 6749 * 6750 * @return Whether this view or one of its descendants actually took focus. 6751 */ 6752 public final boolean requestFocus() { 6753 return requestFocus(View.FOCUS_DOWN); 6754 } 6755 6756 /** 6757 * Call this to try to give focus to a specific view or to one of its 6758 * descendants and give it a hint about what direction focus is heading. 6759 * 6760 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6761 * false), or if it is focusable and it is not focusable in touch mode 6762 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6763 * 6764 * See also {@link #focusSearch(int)}, which is what you call to say that you 6765 * have focus, and you want your parent to look for the next one. 6766 * 6767 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6768 * <code>null</code> set for the previously focused rectangle. 6769 * 6770 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6771 * @return Whether this view or one of its descendants actually took focus. 6772 */ 6773 public final boolean requestFocus(int direction) { 6774 return requestFocus(direction, null); 6775 } 6776 6777 /** 6778 * Call this to try to give focus to a specific view or to one of its descendants 6779 * and give it hints about the direction and a specific rectangle that the focus 6780 * is coming from. The rectangle can help give larger views a finer grained hint 6781 * about where focus is coming from, and therefore, where to show selection, or 6782 * forward focus change internally. 6783 * 6784 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6785 * false), or if it is focusable and it is not focusable in touch mode 6786 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6787 * 6788 * A View will not take focus if it is not visible. 6789 * 6790 * A View will not take focus if one of its parents has 6791 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6792 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6793 * 6794 * See also {@link #focusSearch(int)}, which is what you call to say that you 6795 * have focus, and you want your parent to look for the next one. 6796 * 6797 * You may wish to override this method if your custom {@link View} has an internal 6798 * {@link View} that it wishes to forward the request to. 6799 * 6800 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6801 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6802 * to give a finer grained hint about where focus is coming from. May be null 6803 * if there is no hint. 6804 * @return Whether this view or one of its descendants actually took focus. 6805 */ 6806 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6807 return requestFocusNoSearch(direction, previouslyFocusedRect); 6808 } 6809 6810 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6811 // need to be focusable 6812 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6813 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6814 return false; 6815 } 6816 6817 // need to be focusable in touch mode if in touch mode 6818 if (isInTouchMode() && 6819 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6820 return false; 6821 } 6822 6823 // need to not have any parents blocking us 6824 if (hasAncestorThatBlocksDescendantFocus()) { 6825 return false; 6826 } 6827 6828 handleFocusGainInternal(direction, previouslyFocusedRect); 6829 return true; 6830 } 6831 6832 /** 6833 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6834 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6835 * touch mode to request focus when they are touched. 6836 * 6837 * @return Whether this view or one of its descendants actually took focus. 6838 * 6839 * @see #isInTouchMode() 6840 * 6841 */ 6842 public final boolean requestFocusFromTouch() { 6843 // Leave touch mode if we need to 6844 if (isInTouchMode()) { 6845 ViewRootImpl viewRoot = getViewRootImpl(); 6846 if (viewRoot != null) { 6847 viewRoot.ensureTouchMode(false); 6848 } 6849 } 6850 return requestFocus(View.FOCUS_DOWN); 6851 } 6852 6853 /** 6854 * @return Whether any ancestor of this view blocks descendant focus. 6855 */ 6856 private boolean hasAncestorThatBlocksDescendantFocus() { 6857 ViewParent ancestor = mParent; 6858 while (ancestor instanceof ViewGroup) { 6859 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6860 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6861 return true; 6862 } else { 6863 ancestor = vgAncestor.getParent(); 6864 } 6865 } 6866 return false; 6867 } 6868 6869 /** 6870 * Gets the mode for determining whether this View is important for accessibility 6871 * which is if it fires accessibility events and if it is reported to 6872 * accessibility services that query the screen. 6873 * 6874 * @return The mode for determining whether a View is important for accessibility. 6875 * 6876 * @attr ref android.R.styleable#View_importantForAccessibility 6877 * 6878 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6879 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6880 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6881 */ 6882 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6883 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6884 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6885 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6886 }) 6887 public int getImportantForAccessibility() { 6888 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6889 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6890 } 6891 6892 /** 6893 * Sets how to determine whether this view is important for accessibility 6894 * which is if it fires accessibility events and if it is reported to 6895 * accessibility services that query the screen. 6896 * 6897 * @param mode How to determine whether this view is important for accessibility. 6898 * 6899 * @attr ref android.R.styleable#View_importantForAccessibility 6900 * 6901 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6902 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6903 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6904 */ 6905 public void setImportantForAccessibility(int mode) { 6906 final boolean oldIncludeForAccessibility = includeForAccessibility(); 6907 if (mode != getImportantForAccessibility()) { 6908 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6909 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6910 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6911 if (oldIncludeForAccessibility != includeForAccessibility()) { 6912 notifySubtreeAccessibilityStateChangedIfNeeded(); 6913 } else { 6914 notifyViewAccessibilityStateChangedIfNeeded(); 6915 } 6916 } 6917 } 6918 6919 /** 6920 * Gets whether this view should be exposed for accessibility. 6921 * 6922 * @return Whether the view is exposed for accessibility. 6923 * 6924 * @hide 6925 */ 6926 public boolean isImportantForAccessibility() { 6927 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6928 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6929 switch (mode) { 6930 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6931 return true; 6932 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6933 return false; 6934 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6935 return isActionableForAccessibility() || hasListenersForAccessibility() 6936 || getAccessibilityNodeProvider() != null; 6937 default: 6938 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6939 + mode); 6940 } 6941 } 6942 6943 /** 6944 * Gets the parent for accessibility purposes. Note that the parent for 6945 * accessibility is not necessary the immediate parent. It is the first 6946 * predecessor that is important for accessibility. 6947 * 6948 * @return The parent for accessibility purposes. 6949 */ 6950 public ViewParent getParentForAccessibility() { 6951 if (mParent instanceof View) { 6952 View parentView = (View) mParent; 6953 if (parentView.includeForAccessibility()) { 6954 return mParent; 6955 } else { 6956 return mParent.getParentForAccessibility(); 6957 } 6958 } 6959 return null; 6960 } 6961 6962 /** 6963 * Adds the children of a given View for accessibility. Since some Views are 6964 * not important for accessibility the children for accessibility are not 6965 * necessarily direct children of the view, rather they are the first level of 6966 * descendants important for accessibility. 6967 * 6968 * @param children The list of children for accessibility. 6969 */ 6970 public void addChildrenForAccessibility(ArrayList<View> children) { 6971 if (includeForAccessibility()) { 6972 children.add(this); 6973 } 6974 } 6975 6976 /** 6977 * Whether to regard this view for accessibility. A view is regarded for 6978 * accessibility if it is important for accessibility or the querying 6979 * accessibility service has explicitly requested that view not 6980 * important for accessibility are regarded. 6981 * 6982 * @return Whether to regard the view for accessibility. 6983 * 6984 * @hide 6985 */ 6986 public boolean includeForAccessibility() { 6987 //noinspection SimplifiableIfStatement 6988 if (mAttachInfo != null) { 6989 return (mAttachInfo.mAccessibilityFetchFlags 6990 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 6991 || isImportantForAccessibility(); 6992 } 6993 return false; 6994 } 6995 6996 /** 6997 * Returns whether the View is considered actionable from 6998 * accessibility perspective. Such view are important for 6999 * accessibility. 7000 * 7001 * @return True if the view is actionable for accessibility. 7002 * 7003 * @hide 7004 */ 7005 public boolean isActionableForAccessibility() { 7006 return (isClickable() || isLongClickable() || isFocusable()); 7007 } 7008 7009 /** 7010 * Returns whether the View has registered callbacks wich makes it 7011 * important for accessibility. 7012 * 7013 * @return True if the view is actionable for accessibility. 7014 */ 7015 private boolean hasListenersForAccessibility() { 7016 ListenerInfo info = getListenerInfo(); 7017 return mTouchDelegate != null || info.mOnKeyListener != null 7018 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 7019 || info.mOnHoverListener != null || info.mOnDragListener != null; 7020 } 7021 7022 /** 7023 * Notifies that the accessibility state of this view changed. The change 7024 * is local to this view and does not represent structural changes such 7025 * as children and parent. For example, the view became focusable. The 7026 * notification is at at most once every 7027 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7028 * to avoid unnecessary load to the system. Also once a view has a pending 7029 * notifucation this method is a NOP until the notification has been sent. 7030 * 7031 * @hide 7032 */ 7033 public void notifyViewAccessibilityStateChangedIfNeeded() { 7034 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7035 return; 7036 } 7037 if (mSendViewStateChangedAccessibilityEvent == null) { 7038 mSendViewStateChangedAccessibilityEvent = 7039 new SendViewStateChangedAccessibilityEvent(); 7040 } 7041 mSendViewStateChangedAccessibilityEvent.runOrPost(); 7042 } 7043 7044 /** 7045 * Notifies that the accessibility state of this view changed. The change 7046 * is *not* local to this view and does represent structural changes such 7047 * as children and parent. For example, the view size changed. The 7048 * notification is at at most once every 7049 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 7050 * to avoid unnecessary load to the system. Also once a view has a pending 7051 * notifucation this method is a NOP until the notification has been sent. 7052 * 7053 * @hide 7054 */ 7055 public void notifySubtreeAccessibilityStateChangedIfNeeded() { 7056 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 7057 return; 7058 } 7059 if ((mPrivateFlags2 & PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED) == 0) { 7060 mPrivateFlags2 |= PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7061 if (mParent != null) { 7062 try { 7063 mParent.childAccessibilityStateChanged(this); 7064 } catch (AbstractMethodError e) { 7065 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 7066 " does not fully implement ViewParent", e); 7067 } 7068 } 7069 } 7070 } 7071 7072 /** 7073 * Reset the flag indicating the accessibility state of the subtree rooted 7074 * at this view changed. 7075 */ 7076 void resetSubtreeAccessibilityStateChanged() { 7077 mPrivateFlags2 &= ~PFLAG2_SUBTREE_ACCESSIBILITY_STATE_CHANGED; 7078 } 7079 7080 /** 7081 * Performs the specified accessibility action on the view. For 7082 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 7083 * <p> 7084 * If an {@link AccessibilityDelegate} has been specified via calling 7085 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 7086 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 7087 * is responsible for handling this call. 7088 * </p> 7089 * 7090 * @param action The action to perform. 7091 * @param arguments Optional action arguments. 7092 * @return Whether the action was performed. 7093 */ 7094 public boolean performAccessibilityAction(int action, Bundle arguments) { 7095 if (mAccessibilityDelegate != null) { 7096 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 7097 } else { 7098 return performAccessibilityActionInternal(action, arguments); 7099 } 7100 } 7101 7102 /** 7103 * @see #performAccessibilityAction(int, Bundle) 7104 * 7105 * Note: Called from the default {@link AccessibilityDelegate}. 7106 */ 7107 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 7108 switch (action) { 7109 case AccessibilityNodeInfo.ACTION_CLICK: { 7110 if (isClickable()) { 7111 performClick(); 7112 return true; 7113 } 7114 } break; 7115 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 7116 if (isLongClickable()) { 7117 performLongClick(); 7118 return true; 7119 } 7120 } break; 7121 case AccessibilityNodeInfo.ACTION_FOCUS: { 7122 if (!hasFocus()) { 7123 // Get out of touch mode since accessibility 7124 // wants to move focus around. 7125 getViewRootImpl().ensureTouchMode(false); 7126 return requestFocus(); 7127 } 7128 } break; 7129 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 7130 if (hasFocus()) { 7131 clearFocus(); 7132 return !isFocused(); 7133 } 7134 } break; 7135 case AccessibilityNodeInfo.ACTION_SELECT: { 7136 if (!isSelected()) { 7137 setSelected(true); 7138 return isSelected(); 7139 } 7140 } break; 7141 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 7142 if (isSelected()) { 7143 setSelected(false); 7144 return !isSelected(); 7145 } 7146 } break; 7147 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 7148 if (!isAccessibilityFocused()) { 7149 return requestAccessibilityFocus(); 7150 } 7151 } break; 7152 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 7153 if (isAccessibilityFocused()) { 7154 clearAccessibilityFocus(); 7155 return true; 7156 } 7157 } break; 7158 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 7159 if (arguments != null) { 7160 final int granularity = arguments.getInt( 7161 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7162 final boolean extendSelection = arguments.getBoolean( 7163 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7164 return traverseAtGranularity(granularity, true, extendSelection); 7165 } 7166 } break; 7167 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 7168 if (arguments != null) { 7169 final int granularity = arguments.getInt( 7170 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7171 final boolean extendSelection = arguments.getBoolean( 7172 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7173 return traverseAtGranularity(granularity, false, extendSelection); 7174 } 7175 } break; 7176 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 7177 CharSequence text = getIterableTextForAccessibility(); 7178 if (text == null) { 7179 return false; 7180 } 7181 final int start = (arguments != null) ? arguments.getInt( 7182 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 7183 final int end = (arguments != null) ? arguments.getInt( 7184 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 7185 // Only cursor position can be specified (selection length == 0) 7186 if ((getAccessibilitySelectionStart() != start 7187 || getAccessibilitySelectionEnd() != end) 7188 && (start == end)) { 7189 setAccessibilitySelection(start, end); 7190 notifyViewAccessibilityStateChangedIfNeeded(); 7191 return true; 7192 } 7193 } break; 7194 } 7195 return false; 7196 } 7197 7198 private boolean traverseAtGranularity(int granularity, boolean forward, 7199 boolean extendSelection) { 7200 CharSequence text = getIterableTextForAccessibility(); 7201 if (text == null || text.length() == 0) { 7202 return false; 7203 } 7204 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7205 if (iterator == null) { 7206 return false; 7207 } 7208 int current = getAccessibilitySelectionEnd(); 7209 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7210 current = forward ? 0 : text.length(); 7211 } 7212 final int[] range = forward ? iterator.following(current) : iterator.preceding(current); 7213 if (range == null) { 7214 return false; 7215 } 7216 final int segmentStart = range[0]; 7217 final int segmentEnd = range[1]; 7218 int selectionStart; 7219 int selectionEnd; 7220 if (extendSelection && isAccessibilitySelectionExtendable()) { 7221 selectionStart = getAccessibilitySelectionStart(); 7222 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7223 selectionStart = forward ? segmentStart : segmentEnd; 7224 } 7225 selectionEnd = forward ? segmentEnd : segmentStart; 7226 } else { 7227 selectionStart = selectionEnd= forward ? segmentEnd : segmentStart; 7228 } 7229 setAccessibilitySelection(selectionStart, selectionEnd); 7230 final int action = forward ? AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY 7231 : AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY; 7232 sendViewTextTraversedAtGranularityEvent(action, granularity, segmentStart, segmentEnd); 7233 return true; 7234 } 7235 7236 /** 7237 * Gets the text reported for accessibility purposes. 7238 * 7239 * @return The accessibility text. 7240 * 7241 * @hide 7242 */ 7243 public CharSequence getIterableTextForAccessibility() { 7244 return getContentDescription(); 7245 } 7246 7247 /** 7248 * Gets whether accessibility selection can be extended. 7249 * 7250 * @return If selection is extensible. 7251 * 7252 * @hide 7253 */ 7254 public boolean isAccessibilitySelectionExtendable() { 7255 return false; 7256 } 7257 7258 /** 7259 * @hide 7260 */ 7261 public int getAccessibilitySelectionStart() { 7262 return mAccessibilityCursorPosition; 7263 } 7264 7265 /** 7266 * @hide 7267 */ 7268 public int getAccessibilitySelectionEnd() { 7269 return getAccessibilitySelectionStart(); 7270 } 7271 7272 /** 7273 * @hide 7274 */ 7275 public void setAccessibilitySelection(int start, int end) { 7276 if (start == end && end == mAccessibilityCursorPosition) { 7277 return; 7278 } 7279 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 7280 mAccessibilityCursorPosition = start; 7281 } else { 7282 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 7283 } 7284 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 7285 } 7286 7287 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7288 int fromIndex, int toIndex) { 7289 if (mParent == null) { 7290 return; 7291 } 7292 AccessibilityEvent event = AccessibilityEvent.obtain( 7293 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7294 onInitializeAccessibilityEvent(event); 7295 onPopulateAccessibilityEvent(event); 7296 event.setFromIndex(fromIndex); 7297 event.setToIndex(toIndex); 7298 event.setAction(action); 7299 event.setMovementGranularity(granularity); 7300 mParent.requestSendAccessibilityEvent(this, event); 7301 } 7302 7303 /** 7304 * @hide 7305 */ 7306 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7307 switch (granularity) { 7308 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7309 CharSequence text = getIterableTextForAccessibility(); 7310 if (text != null && text.length() > 0) { 7311 CharacterTextSegmentIterator iterator = 7312 CharacterTextSegmentIterator.getInstance( 7313 mContext.getResources().getConfiguration().locale); 7314 iterator.initialize(text.toString()); 7315 return iterator; 7316 } 7317 } break; 7318 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7319 CharSequence text = getIterableTextForAccessibility(); 7320 if (text != null && text.length() > 0) { 7321 WordTextSegmentIterator iterator = 7322 WordTextSegmentIterator.getInstance( 7323 mContext.getResources().getConfiguration().locale); 7324 iterator.initialize(text.toString()); 7325 return iterator; 7326 } 7327 } break; 7328 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7329 CharSequence text = getIterableTextForAccessibility(); 7330 if (text != null && text.length() > 0) { 7331 ParagraphTextSegmentIterator iterator = 7332 ParagraphTextSegmentIterator.getInstance(); 7333 iterator.initialize(text.toString()); 7334 return iterator; 7335 } 7336 } break; 7337 } 7338 return null; 7339 } 7340 7341 /** 7342 * @hide 7343 */ 7344 public void dispatchStartTemporaryDetach() { 7345 clearAccessibilityFocus(); 7346 clearDisplayList(); 7347 7348 onStartTemporaryDetach(); 7349 } 7350 7351 /** 7352 * This is called when a container is going to temporarily detach a child, with 7353 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7354 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7355 * {@link #onDetachedFromWindow()} when the container is done. 7356 */ 7357 public void onStartTemporaryDetach() { 7358 removeUnsetPressCallback(); 7359 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7360 } 7361 7362 /** 7363 * @hide 7364 */ 7365 public void dispatchFinishTemporaryDetach() { 7366 onFinishTemporaryDetach(); 7367 } 7368 7369 /** 7370 * Called after {@link #onStartTemporaryDetach} when the container is done 7371 * changing the view. 7372 */ 7373 public void onFinishTemporaryDetach() { 7374 } 7375 7376 /** 7377 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7378 * for this view's window. Returns null if the view is not currently attached 7379 * to the window. Normally you will not need to use this directly, but 7380 * just use the standard high-level event callbacks like 7381 * {@link #onKeyDown(int, KeyEvent)}. 7382 */ 7383 public KeyEvent.DispatcherState getKeyDispatcherState() { 7384 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7385 } 7386 7387 /** 7388 * Dispatch a key event before it is processed by any input method 7389 * associated with the view hierarchy. This can be used to intercept 7390 * key events in special situations before the IME consumes them; a 7391 * typical example would be handling the BACK key to update the application's 7392 * UI instead of allowing the IME to see it and close itself. 7393 * 7394 * @param event The key event to be dispatched. 7395 * @return True if the event was handled, false otherwise. 7396 */ 7397 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7398 return onKeyPreIme(event.getKeyCode(), event); 7399 } 7400 7401 /** 7402 * Dispatch a key event to the next view on the focus path. This path runs 7403 * from the top of the view tree down to the currently focused view. If this 7404 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7405 * the next node down the focus path. This method also fires any key 7406 * listeners. 7407 * 7408 * @param event The key event to be dispatched. 7409 * @return True if the event was handled, false otherwise. 7410 */ 7411 public boolean dispatchKeyEvent(KeyEvent event) { 7412 if (mInputEventConsistencyVerifier != null) { 7413 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7414 } 7415 7416 // Give any attached key listener a first crack at the event. 7417 //noinspection SimplifiableIfStatement 7418 ListenerInfo li = mListenerInfo; 7419 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7420 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7421 return true; 7422 } 7423 7424 if (event.dispatch(this, mAttachInfo != null 7425 ? mAttachInfo.mKeyDispatchState : null, this)) { 7426 return true; 7427 } 7428 7429 if (mInputEventConsistencyVerifier != null) { 7430 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7431 } 7432 return false; 7433 } 7434 7435 /** 7436 * Dispatches a key shortcut event. 7437 * 7438 * @param event The key event to be dispatched. 7439 * @return True if the event was handled by the view, false otherwise. 7440 */ 7441 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7442 return onKeyShortcut(event.getKeyCode(), event); 7443 } 7444 7445 /** 7446 * Pass the touch screen motion event down to the target view, or this 7447 * view if it is the target. 7448 * 7449 * @param event The motion event to be dispatched. 7450 * @return True if the event was handled by the view, false otherwise. 7451 */ 7452 public boolean dispatchTouchEvent(MotionEvent event) { 7453 if (mInputEventConsistencyVerifier != null) { 7454 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7455 } 7456 7457 if (onFilterTouchEventForSecurity(event)) { 7458 //noinspection SimplifiableIfStatement 7459 ListenerInfo li = mListenerInfo; 7460 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7461 && li.mOnTouchListener.onTouch(this, event)) { 7462 return true; 7463 } 7464 7465 if (onTouchEvent(event)) { 7466 return true; 7467 } 7468 } 7469 7470 if (mInputEventConsistencyVerifier != null) { 7471 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7472 } 7473 return false; 7474 } 7475 7476 /** 7477 * Filter the touch event to apply security policies. 7478 * 7479 * @param event The motion event to be filtered. 7480 * @return True if the event should be dispatched, false if the event should be dropped. 7481 * 7482 * @see #getFilterTouchesWhenObscured 7483 */ 7484 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7485 //noinspection RedundantIfStatement 7486 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7487 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7488 // Window is obscured, drop this touch. 7489 return false; 7490 } 7491 return true; 7492 } 7493 7494 /** 7495 * Pass a trackball motion event down to the focused view. 7496 * 7497 * @param event The motion event to be dispatched. 7498 * @return True if the event was handled by the view, false otherwise. 7499 */ 7500 public boolean dispatchTrackballEvent(MotionEvent event) { 7501 if (mInputEventConsistencyVerifier != null) { 7502 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7503 } 7504 7505 return onTrackballEvent(event); 7506 } 7507 7508 /** 7509 * Dispatch a generic motion event. 7510 * <p> 7511 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7512 * are delivered to the view under the pointer. All other generic motion events are 7513 * delivered to the focused view. Hover events are handled specially and are delivered 7514 * to {@link #onHoverEvent(MotionEvent)}. 7515 * </p> 7516 * 7517 * @param event The motion event to be dispatched. 7518 * @return True if the event was handled by the view, false otherwise. 7519 */ 7520 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7521 if (mInputEventConsistencyVerifier != null) { 7522 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7523 } 7524 7525 final int source = event.getSource(); 7526 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7527 final int action = event.getAction(); 7528 if (action == MotionEvent.ACTION_HOVER_ENTER 7529 || action == MotionEvent.ACTION_HOVER_MOVE 7530 || action == MotionEvent.ACTION_HOVER_EXIT) { 7531 if (dispatchHoverEvent(event)) { 7532 return true; 7533 } 7534 } else if (dispatchGenericPointerEvent(event)) { 7535 return true; 7536 } 7537 } else if (dispatchGenericFocusedEvent(event)) { 7538 return true; 7539 } 7540 7541 if (dispatchGenericMotionEventInternal(event)) { 7542 return true; 7543 } 7544 7545 if (mInputEventConsistencyVerifier != null) { 7546 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7547 } 7548 return false; 7549 } 7550 7551 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7552 //noinspection SimplifiableIfStatement 7553 ListenerInfo li = mListenerInfo; 7554 if (li != null && li.mOnGenericMotionListener != null 7555 && (mViewFlags & ENABLED_MASK) == ENABLED 7556 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7557 return true; 7558 } 7559 7560 if (onGenericMotionEvent(event)) { 7561 return true; 7562 } 7563 7564 if (mInputEventConsistencyVerifier != null) { 7565 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7566 } 7567 return false; 7568 } 7569 7570 /** 7571 * Dispatch a hover event. 7572 * <p> 7573 * Do not call this method directly. 7574 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7575 * </p> 7576 * 7577 * @param event The motion event to be dispatched. 7578 * @return True if the event was handled by the view, false otherwise. 7579 */ 7580 protected boolean dispatchHoverEvent(MotionEvent event) { 7581 ListenerInfo li = mListenerInfo; 7582 //noinspection SimplifiableIfStatement 7583 if (li != null && li.mOnHoverListener != null 7584 && (mViewFlags & ENABLED_MASK) == ENABLED 7585 && li.mOnHoverListener.onHover(this, event)) { 7586 return true; 7587 } 7588 7589 return onHoverEvent(event); 7590 } 7591 7592 /** 7593 * Returns true if the view has a child to which it has recently sent 7594 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7595 * it does not have a hovered child, then it must be the innermost hovered view. 7596 * @hide 7597 */ 7598 protected boolean hasHoveredChild() { 7599 return false; 7600 } 7601 7602 /** 7603 * Dispatch a generic motion event to the view under the first pointer. 7604 * <p> 7605 * Do not call this method directly. 7606 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7607 * </p> 7608 * 7609 * @param event The motion event to be dispatched. 7610 * @return True if the event was handled by the view, false otherwise. 7611 */ 7612 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7613 return false; 7614 } 7615 7616 /** 7617 * Dispatch a generic motion event to the currently focused view. 7618 * <p> 7619 * Do not call this method directly. 7620 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7621 * </p> 7622 * 7623 * @param event The motion event to be dispatched. 7624 * @return True if the event was handled by the view, false otherwise. 7625 */ 7626 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7627 return false; 7628 } 7629 7630 /** 7631 * Dispatch a pointer event. 7632 * <p> 7633 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7634 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7635 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7636 * and should not be expected to handle other pointing device features. 7637 * </p> 7638 * 7639 * @param event The motion event to be dispatched. 7640 * @return True if the event was handled by the view, false otherwise. 7641 * @hide 7642 */ 7643 public final boolean dispatchPointerEvent(MotionEvent event) { 7644 if (event.isTouchEvent()) { 7645 return dispatchTouchEvent(event); 7646 } else { 7647 return dispatchGenericMotionEvent(event); 7648 } 7649 } 7650 7651 /** 7652 * Called when the window containing this view gains or loses window focus. 7653 * ViewGroups should override to route to their children. 7654 * 7655 * @param hasFocus True if the window containing this view now has focus, 7656 * false otherwise. 7657 */ 7658 public void dispatchWindowFocusChanged(boolean hasFocus) { 7659 onWindowFocusChanged(hasFocus); 7660 } 7661 7662 /** 7663 * Called when the window containing this view gains or loses focus. Note 7664 * that this is separate from view focus: to receive key events, both 7665 * your view and its window must have focus. If a window is displayed 7666 * on top of yours that takes input focus, then your own window will lose 7667 * focus but the view focus will remain unchanged. 7668 * 7669 * @param hasWindowFocus True if the window containing this view now has 7670 * focus, false otherwise. 7671 */ 7672 public void onWindowFocusChanged(boolean hasWindowFocus) { 7673 InputMethodManager imm = InputMethodManager.peekInstance(); 7674 if (!hasWindowFocus) { 7675 if (isPressed()) { 7676 setPressed(false); 7677 } 7678 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7679 imm.focusOut(this); 7680 } 7681 removeLongPressCallback(); 7682 removeTapCallback(); 7683 onFocusLost(); 7684 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7685 imm.focusIn(this); 7686 } 7687 refreshDrawableState(); 7688 } 7689 7690 /** 7691 * Returns true if this view is in a window that currently has window focus. 7692 * Note that this is not the same as the view itself having focus. 7693 * 7694 * @return True if this view is in a window that currently has window focus. 7695 */ 7696 public boolean hasWindowFocus() { 7697 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7698 } 7699 7700 /** 7701 * Dispatch a view visibility change down the view hierarchy. 7702 * ViewGroups should override to route to their children. 7703 * @param changedView The view whose visibility changed. Could be 'this' or 7704 * an ancestor view. 7705 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7706 * {@link #INVISIBLE} or {@link #GONE}. 7707 */ 7708 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7709 onVisibilityChanged(changedView, visibility); 7710 } 7711 7712 /** 7713 * Called when the visibility of the view or an ancestor of the view is changed. 7714 * @param changedView The view whose visibility changed. Could be 'this' or 7715 * an ancestor view. 7716 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7717 * {@link #INVISIBLE} or {@link #GONE}. 7718 */ 7719 protected void onVisibilityChanged(View changedView, int visibility) { 7720 if (visibility == VISIBLE) { 7721 if (mAttachInfo != null) { 7722 initialAwakenScrollBars(); 7723 } else { 7724 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7725 } 7726 } 7727 } 7728 7729 /** 7730 * Dispatch a hint about whether this view is displayed. For instance, when 7731 * a View moves out of the screen, it might receives a display hint indicating 7732 * the view is not displayed. Applications should not <em>rely</em> on this hint 7733 * as there is no guarantee that they will receive one. 7734 * 7735 * @param hint A hint about whether or not this view is displayed: 7736 * {@link #VISIBLE} or {@link #INVISIBLE}. 7737 */ 7738 public void dispatchDisplayHint(int hint) { 7739 onDisplayHint(hint); 7740 } 7741 7742 /** 7743 * Gives this view a hint about whether is displayed or not. For instance, when 7744 * a View moves out of the screen, it might receives a display hint indicating 7745 * the view is not displayed. Applications should not <em>rely</em> on this hint 7746 * as there is no guarantee that they will receive one. 7747 * 7748 * @param hint A hint about whether or not this view is displayed: 7749 * {@link #VISIBLE} or {@link #INVISIBLE}. 7750 */ 7751 protected void onDisplayHint(int hint) { 7752 } 7753 7754 /** 7755 * Dispatch a window visibility change down the view hierarchy. 7756 * ViewGroups should override to route to their children. 7757 * 7758 * @param visibility The new visibility of the window. 7759 * 7760 * @see #onWindowVisibilityChanged(int) 7761 */ 7762 public void dispatchWindowVisibilityChanged(int visibility) { 7763 onWindowVisibilityChanged(visibility); 7764 } 7765 7766 /** 7767 * Called when the window containing has change its visibility 7768 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7769 * that this tells you whether or not your window is being made visible 7770 * to the window manager; this does <em>not</em> tell you whether or not 7771 * your window is obscured by other windows on the screen, even if it 7772 * is itself visible. 7773 * 7774 * @param visibility The new visibility of the window. 7775 */ 7776 protected void onWindowVisibilityChanged(int visibility) { 7777 if (visibility == VISIBLE) { 7778 initialAwakenScrollBars(); 7779 } 7780 } 7781 7782 /** 7783 * Returns the current visibility of the window this view is attached to 7784 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7785 * 7786 * @return Returns the current visibility of the view's window. 7787 */ 7788 public int getWindowVisibility() { 7789 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7790 } 7791 7792 /** 7793 * Retrieve the overall visible display size in which the window this view is 7794 * attached to has been positioned in. This takes into account screen 7795 * decorations above the window, for both cases where the window itself 7796 * is being position inside of them or the window is being placed under 7797 * then and covered insets are used for the window to position its content 7798 * inside. In effect, this tells you the available area where content can 7799 * be placed and remain visible to users. 7800 * 7801 * <p>This function requires an IPC back to the window manager to retrieve 7802 * the requested information, so should not be used in performance critical 7803 * code like drawing. 7804 * 7805 * @param outRect Filled in with the visible display frame. If the view 7806 * is not attached to a window, this is simply the raw display size. 7807 */ 7808 public void getWindowVisibleDisplayFrame(Rect outRect) { 7809 if (mAttachInfo != null) { 7810 try { 7811 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7812 } catch (RemoteException e) { 7813 return; 7814 } 7815 // XXX This is really broken, and probably all needs to be done 7816 // in the window manager, and we need to know more about whether 7817 // we want the area behind or in front of the IME. 7818 final Rect insets = mAttachInfo.mVisibleInsets; 7819 outRect.left += insets.left; 7820 outRect.top += insets.top; 7821 outRect.right -= insets.right; 7822 outRect.bottom -= insets.bottom; 7823 return; 7824 } 7825 // The view is not attached to a display so we don't have a context. 7826 // Make a best guess about the display size. 7827 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 7828 d.getRectSize(outRect); 7829 } 7830 7831 /** 7832 * Dispatch a notification about a resource configuration change down 7833 * the view hierarchy. 7834 * ViewGroups should override to route to their children. 7835 * 7836 * @param newConfig The new resource configuration. 7837 * 7838 * @see #onConfigurationChanged(android.content.res.Configuration) 7839 */ 7840 public void dispatchConfigurationChanged(Configuration newConfig) { 7841 onConfigurationChanged(newConfig); 7842 } 7843 7844 /** 7845 * Called when the current configuration of the resources being used 7846 * by the application have changed. You can use this to decide when 7847 * to reload resources that can changed based on orientation and other 7848 * configuration characterstics. You only need to use this if you are 7849 * not relying on the normal {@link android.app.Activity} mechanism of 7850 * recreating the activity instance upon a configuration change. 7851 * 7852 * @param newConfig The new resource configuration. 7853 */ 7854 protected void onConfigurationChanged(Configuration newConfig) { 7855 } 7856 7857 /** 7858 * Private function to aggregate all per-view attributes in to the view 7859 * root. 7860 */ 7861 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7862 performCollectViewAttributes(attachInfo, visibility); 7863 } 7864 7865 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7866 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7867 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7868 attachInfo.mKeepScreenOn = true; 7869 } 7870 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7871 ListenerInfo li = mListenerInfo; 7872 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7873 attachInfo.mHasSystemUiListeners = true; 7874 } 7875 } 7876 } 7877 7878 void needGlobalAttributesUpdate(boolean force) { 7879 final AttachInfo ai = mAttachInfo; 7880 if (ai != null && !ai.mRecomputeGlobalAttributes) { 7881 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7882 || ai.mHasSystemUiListeners) { 7883 ai.mRecomputeGlobalAttributes = true; 7884 } 7885 } 7886 } 7887 7888 /** 7889 * Returns whether the device is currently in touch mode. Touch mode is entered 7890 * once the user begins interacting with the device by touch, and affects various 7891 * things like whether focus is always visible to the user. 7892 * 7893 * @return Whether the device is in touch mode. 7894 */ 7895 @ViewDebug.ExportedProperty 7896 public boolean isInTouchMode() { 7897 if (mAttachInfo != null) { 7898 return mAttachInfo.mInTouchMode; 7899 } else { 7900 return ViewRootImpl.isInTouchMode(); 7901 } 7902 } 7903 7904 /** 7905 * Returns the context the view is running in, through which it can 7906 * access the current theme, resources, etc. 7907 * 7908 * @return The view's Context. 7909 */ 7910 @ViewDebug.CapturedViewProperty 7911 public final Context getContext() { 7912 return mContext; 7913 } 7914 7915 /** 7916 * Handle a key event before it is processed by any input method 7917 * associated with the view hierarchy. This can be used to intercept 7918 * key events in special situations before the IME consumes them; a 7919 * typical example would be handling the BACK key to update the application's 7920 * UI instead of allowing the IME to see it and close itself. 7921 * 7922 * @param keyCode The value in event.getKeyCode(). 7923 * @param event Description of the key event. 7924 * @return If you handled the event, return true. If you want to allow the 7925 * event to be handled by the next receiver, return false. 7926 */ 7927 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7928 return false; 7929 } 7930 7931 /** 7932 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7933 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7934 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7935 * is released, if the view is enabled and clickable. 7936 * 7937 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7938 * although some may elect to do so in some situations. Do not rely on this to 7939 * catch software key presses. 7940 * 7941 * @param keyCode A key code that represents the button pressed, from 7942 * {@link android.view.KeyEvent}. 7943 * @param event The KeyEvent object that defines the button action. 7944 */ 7945 public boolean onKeyDown(int keyCode, KeyEvent event) { 7946 boolean result = false; 7947 7948 switch (keyCode) { 7949 case KeyEvent.KEYCODE_DPAD_CENTER: 7950 case KeyEvent.KEYCODE_ENTER: { 7951 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7952 return true; 7953 } 7954 // Long clickable items don't necessarily have to be clickable 7955 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7956 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7957 (event.getRepeatCount() == 0)) { 7958 setPressed(true); 7959 checkForLongClick(0); 7960 return true; 7961 } 7962 break; 7963 } 7964 } 7965 return result; 7966 } 7967 7968 /** 7969 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7970 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7971 * the event). 7972 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7973 * although some may elect to do so in some situations. Do not rely on this to 7974 * catch software key presses. 7975 */ 7976 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7977 return false; 7978 } 7979 7980 /** 7981 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7982 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7983 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7984 * {@link KeyEvent#KEYCODE_ENTER} is released. 7985 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7986 * although some may elect to do so in some situations. Do not rely on this to 7987 * catch software key presses. 7988 * 7989 * @param keyCode A key code that represents the button pressed, from 7990 * {@link android.view.KeyEvent}. 7991 * @param event The KeyEvent object that defines the button action. 7992 */ 7993 public boolean onKeyUp(int keyCode, KeyEvent event) { 7994 boolean result = false; 7995 7996 switch (keyCode) { 7997 case KeyEvent.KEYCODE_DPAD_CENTER: 7998 case KeyEvent.KEYCODE_ENTER: { 7999 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 8000 return true; 8001 } 8002 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 8003 setPressed(false); 8004 8005 if (!mHasPerformedLongPress) { 8006 // This is a tap, so remove the longpress check 8007 removeLongPressCallback(); 8008 8009 result = performClick(); 8010 } 8011 } 8012 break; 8013 } 8014 } 8015 return result; 8016 } 8017 8018 /** 8019 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 8020 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 8021 * the event). 8022 * <p>Key presses in software keyboards will generally NOT trigger this listener, 8023 * although some may elect to do so in some situations. Do not rely on this to 8024 * catch software key presses. 8025 * 8026 * @param keyCode A key code that represents the button pressed, from 8027 * {@link android.view.KeyEvent}. 8028 * @param repeatCount The number of times the action was made. 8029 * @param event The KeyEvent object that defines the button action. 8030 */ 8031 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 8032 return false; 8033 } 8034 8035 /** 8036 * Called on the focused view when a key shortcut event is not handled. 8037 * Override this method to implement local key shortcuts for the View. 8038 * Key shortcuts can also be implemented by setting the 8039 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 8040 * 8041 * @param keyCode The value in event.getKeyCode(). 8042 * @param event Description of the key event. 8043 * @return If you handled the event, return true. If you want to allow the 8044 * event to be handled by the next receiver, return false. 8045 */ 8046 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 8047 return false; 8048 } 8049 8050 /** 8051 * Check whether the called view is a text editor, in which case it 8052 * would make sense to automatically display a soft input window for 8053 * it. Subclasses should override this if they implement 8054 * {@link #onCreateInputConnection(EditorInfo)} to return true if 8055 * a call on that method would return a non-null InputConnection, and 8056 * they are really a first-class editor that the user would normally 8057 * start typing on when the go into a window containing your view. 8058 * 8059 * <p>The default implementation always returns false. This does 8060 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 8061 * will not be called or the user can not otherwise perform edits on your 8062 * view; it is just a hint to the system that this is not the primary 8063 * purpose of this view. 8064 * 8065 * @return Returns true if this view is a text editor, else false. 8066 */ 8067 public boolean onCheckIsTextEditor() { 8068 return false; 8069 } 8070 8071 /** 8072 * Create a new InputConnection for an InputMethod to interact 8073 * with the view. The default implementation returns null, since it doesn't 8074 * support input methods. You can override this to implement such support. 8075 * This is only needed for views that take focus and text input. 8076 * 8077 * <p>When implementing this, you probably also want to implement 8078 * {@link #onCheckIsTextEditor()} to indicate you will return a 8079 * non-null InputConnection. 8080 * 8081 * @param outAttrs Fill in with attribute information about the connection. 8082 */ 8083 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 8084 return null; 8085 } 8086 8087 /** 8088 * Called by the {@link android.view.inputmethod.InputMethodManager} 8089 * when a view who is not the current 8090 * input connection target is trying to make a call on the manager. The 8091 * default implementation returns false; you can override this to return 8092 * true for certain views if you are performing InputConnection proxying 8093 * to them. 8094 * @param view The View that is making the InputMethodManager call. 8095 * @return Return true to allow the call, false to reject. 8096 */ 8097 public boolean checkInputConnectionProxy(View view) { 8098 return false; 8099 } 8100 8101 /** 8102 * Show the context menu for this view. It is not safe to hold on to the 8103 * menu after returning from this method. 8104 * 8105 * You should normally not overload this method. Overload 8106 * {@link #onCreateContextMenu(ContextMenu)} or define an 8107 * {@link OnCreateContextMenuListener} to add items to the context menu. 8108 * 8109 * @param menu The context menu to populate 8110 */ 8111 public void createContextMenu(ContextMenu menu) { 8112 ContextMenuInfo menuInfo = getContextMenuInfo(); 8113 8114 // Sets the current menu info so all items added to menu will have 8115 // my extra info set. 8116 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 8117 8118 onCreateContextMenu(menu); 8119 ListenerInfo li = mListenerInfo; 8120 if (li != null && li.mOnCreateContextMenuListener != null) { 8121 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 8122 } 8123 8124 // Clear the extra information so subsequent items that aren't mine don't 8125 // have my extra info. 8126 ((MenuBuilder)menu).setCurrentMenuInfo(null); 8127 8128 if (mParent != null) { 8129 mParent.createContextMenu(menu); 8130 } 8131 } 8132 8133 /** 8134 * Views should implement this if they have extra information to associate 8135 * with the context menu. The return result is supplied as a parameter to 8136 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 8137 * callback. 8138 * 8139 * @return Extra information about the item for which the context menu 8140 * should be shown. This information will vary across different 8141 * subclasses of View. 8142 */ 8143 protected ContextMenuInfo getContextMenuInfo() { 8144 return null; 8145 } 8146 8147 /** 8148 * Views should implement this if the view itself is going to add items to 8149 * the context menu. 8150 * 8151 * @param menu the context menu to populate 8152 */ 8153 protected void onCreateContextMenu(ContextMenu menu) { 8154 } 8155 8156 /** 8157 * Implement this method to handle trackball motion events. The 8158 * <em>relative</em> movement of the trackball since the last event 8159 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 8160 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 8161 * that a movement of 1 corresponds to the user pressing one DPAD key (so 8162 * they will often be fractional values, representing the more fine-grained 8163 * movement information available from a trackball). 8164 * 8165 * @param event The motion event. 8166 * @return True if the event was handled, false otherwise. 8167 */ 8168 public boolean onTrackballEvent(MotionEvent event) { 8169 return false; 8170 } 8171 8172 /** 8173 * Implement this method to handle generic motion events. 8174 * <p> 8175 * Generic motion events describe joystick movements, mouse hovers, track pad 8176 * touches, scroll wheel movements and other input events. The 8177 * {@link MotionEvent#getSource() source} of the motion event specifies 8178 * the class of input that was received. Implementations of this method 8179 * must examine the bits in the source before processing the event. 8180 * The following code example shows how this is done. 8181 * </p><p> 8182 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8183 * are delivered to the view under the pointer. All other generic motion events are 8184 * delivered to the focused view. 8185 * </p> 8186 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 8187 * if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { 8188 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 8189 * // process the joystick movement... 8190 * return true; 8191 * } 8192 * } 8193 * if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { 8194 * switch (event.getAction()) { 8195 * case MotionEvent.ACTION_HOVER_MOVE: 8196 * // process the mouse hover movement... 8197 * return true; 8198 * case MotionEvent.ACTION_SCROLL: 8199 * // process the scroll wheel movement... 8200 * return true; 8201 * } 8202 * } 8203 * return super.onGenericMotionEvent(event); 8204 * }</pre> 8205 * 8206 * @param event The generic motion event being processed. 8207 * @return True if the event was handled, false otherwise. 8208 */ 8209 public boolean onGenericMotionEvent(MotionEvent event) { 8210 return false; 8211 } 8212 8213 /** 8214 * Implement this method to handle hover events. 8215 * <p> 8216 * This method is called whenever a pointer is hovering into, over, or out of the 8217 * bounds of a view and the view is not currently being touched. 8218 * Hover events are represented as pointer events with action 8219 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 8220 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 8221 * </p> 8222 * <ul> 8223 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 8224 * when the pointer enters the bounds of the view.</li> 8225 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 8226 * when the pointer has already entered the bounds of the view and has moved.</li> 8227 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 8228 * when the pointer has exited the bounds of the view or when the pointer is 8229 * about to go down due to a button click, tap, or similar user action that 8230 * causes the view to be touched.</li> 8231 * </ul> 8232 * <p> 8233 * The view should implement this method to return true to indicate that it is 8234 * handling the hover event, such as by changing its drawable state. 8235 * </p><p> 8236 * The default implementation calls {@link #setHovered} to update the hovered state 8237 * of the view when a hover enter or hover exit event is received, if the view 8238 * is enabled and is clickable. The default implementation also sends hover 8239 * accessibility events. 8240 * </p> 8241 * 8242 * @param event The motion event that describes the hover. 8243 * @return True if the view handled the hover event. 8244 * 8245 * @see #isHovered 8246 * @see #setHovered 8247 * @see #onHoverChanged 8248 */ 8249 public boolean onHoverEvent(MotionEvent event) { 8250 // The root view may receive hover (or touch) events that are outside the bounds of 8251 // the window. This code ensures that we only send accessibility events for 8252 // hovers that are actually within the bounds of the root view. 8253 final int action = event.getActionMasked(); 8254 if (!mSendingHoverAccessibilityEvents) { 8255 if ((action == MotionEvent.ACTION_HOVER_ENTER 8256 || action == MotionEvent.ACTION_HOVER_MOVE) 8257 && !hasHoveredChild() 8258 && pointInView(event.getX(), event.getY())) { 8259 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8260 mSendingHoverAccessibilityEvents = true; 8261 } 8262 } else { 8263 if (action == MotionEvent.ACTION_HOVER_EXIT 8264 || (action == MotionEvent.ACTION_MOVE 8265 && !pointInView(event.getX(), event.getY()))) { 8266 mSendingHoverAccessibilityEvents = false; 8267 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8268 // If the window does not have input focus we take away accessibility 8269 // focus as soon as the user stop hovering over the view. 8270 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8271 getViewRootImpl().setAccessibilityFocus(null, null); 8272 } 8273 } 8274 } 8275 8276 if (isHoverable()) { 8277 switch (action) { 8278 case MotionEvent.ACTION_HOVER_ENTER: 8279 setHovered(true); 8280 break; 8281 case MotionEvent.ACTION_HOVER_EXIT: 8282 setHovered(false); 8283 break; 8284 } 8285 8286 // Dispatch the event to onGenericMotionEvent before returning true. 8287 // This is to provide compatibility with existing applications that 8288 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8289 // break because of the new default handling for hoverable views 8290 // in onHoverEvent. 8291 // Note that onGenericMotionEvent will be called by default when 8292 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8293 dispatchGenericMotionEventInternal(event); 8294 // The event was already handled by calling setHovered(), so always 8295 // return true. 8296 return true; 8297 } 8298 8299 return false; 8300 } 8301 8302 /** 8303 * Returns true if the view should handle {@link #onHoverEvent} 8304 * by calling {@link #setHovered} to change its hovered state. 8305 * 8306 * @return True if the view is hoverable. 8307 */ 8308 private boolean isHoverable() { 8309 final int viewFlags = mViewFlags; 8310 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8311 return false; 8312 } 8313 8314 return (viewFlags & CLICKABLE) == CLICKABLE 8315 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8316 } 8317 8318 /** 8319 * Returns true if the view is currently hovered. 8320 * 8321 * @return True if the view is currently hovered. 8322 * 8323 * @see #setHovered 8324 * @see #onHoverChanged 8325 */ 8326 @ViewDebug.ExportedProperty 8327 public boolean isHovered() { 8328 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8329 } 8330 8331 /** 8332 * Sets whether the view is currently hovered. 8333 * <p> 8334 * Calling this method also changes the drawable state of the view. This 8335 * enables the view to react to hover by using different drawable resources 8336 * to change its appearance. 8337 * </p><p> 8338 * The {@link #onHoverChanged} method is called when the hovered state changes. 8339 * </p> 8340 * 8341 * @param hovered True if the view is hovered. 8342 * 8343 * @see #isHovered 8344 * @see #onHoverChanged 8345 */ 8346 public void setHovered(boolean hovered) { 8347 if (hovered) { 8348 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8349 mPrivateFlags |= PFLAG_HOVERED; 8350 refreshDrawableState(); 8351 onHoverChanged(true); 8352 } 8353 } else { 8354 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8355 mPrivateFlags &= ~PFLAG_HOVERED; 8356 refreshDrawableState(); 8357 onHoverChanged(false); 8358 } 8359 } 8360 } 8361 8362 /** 8363 * Implement this method to handle hover state changes. 8364 * <p> 8365 * This method is called whenever the hover state changes as a result of a 8366 * call to {@link #setHovered}. 8367 * </p> 8368 * 8369 * @param hovered The current hover state, as returned by {@link #isHovered}. 8370 * 8371 * @see #isHovered 8372 * @see #setHovered 8373 */ 8374 public void onHoverChanged(boolean hovered) { 8375 } 8376 8377 /** 8378 * Implement this method to handle touch screen motion events. 8379 * 8380 * @param event The motion event. 8381 * @return True if the event was handled, false otherwise. 8382 */ 8383 public boolean onTouchEvent(MotionEvent event) { 8384 final int viewFlags = mViewFlags; 8385 8386 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8387 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8388 setPressed(false); 8389 } 8390 // A disabled view that is clickable still consumes the touch 8391 // events, it just doesn't respond to them. 8392 return (((viewFlags & CLICKABLE) == CLICKABLE || 8393 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8394 } 8395 8396 if (mTouchDelegate != null) { 8397 if (mTouchDelegate.onTouchEvent(event)) { 8398 return true; 8399 } 8400 } 8401 8402 if (((viewFlags & CLICKABLE) == CLICKABLE || 8403 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8404 switch (event.getAction()) { 8405 case MotionEvent.ACTION_UP: 8406 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8407 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8408 // take focus if we don't have it already and we should in 8409 // touch mode. 8410 boolean focusTaken = false; 8411 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8412 focusTaken = requestFocus(); 8413 } 8414 8415 if (prepressed) { 8416 // The button is being released before we actually 8417 // showed it as pressed. Make it show the pressed 8418 // state now (before scheduling the click) to ensure 8419 // the user sees it. 8420 setPressed(true); 8421 } 8422 8423 if (!mHasPerformedLongPress) { 8424 // This is a tap, so remove the longpress check 8425 removeLongPressCallback(); 8426 8427 // Only perform take click actions if we were in the pressed state 8428 if (!focusTaken) { 8429 // Use a Runnable and post this rather than calling 8430 // performClick directly. This lets other visual state 8431 // of the view update before click actions start. 8432 if (mPerformClick == null) { 8433 mPerformClick = new PerformClick(); 8434 } 8435 if (!post(mPerformClick)) { 8436 performClick(); 8437 } 8438 } 8439 } 8440 8441 if (mUnsetPressedState == null) { 8442 mUnsetPressedState = new UnsetPressedState(); 8443 } 8444 8445 if (prepressed) { 8446 postDelayed(mUnsetPressedState, 8447 ViewConfiguration.getPressedStateDuration()); 8448 } else if (!post(mUnsetPressedState)) { 8449 // If the post failed, unpress right now 8450 mUnsetPressedState.run(); 8451 } 8452 removeTapCallback(); 8453 } 8454 break; 8455 8456 case MotionEvent.ACTION_DOWN: 8457 mHasPerformedLongPress = false; 8458 8459 if (performButtonActionOnTouchDown(event)) { 8460 break; 8461 } 8462 8463 // Walk up the hierarchy to determine if we're inside a scrolling container. 8464 boolean isInScrollingContainer = isInScrollingContainer(); 8465 8466 // For views inside a scrolling container, delay the pressed feedback for 8467 // a short period in case this is a scroll. 8468 if (isInScrollingContainer) { 8469 mPrivateFlags |= PFLAG_PREPRESSED; 8470 if (mPendingCheckForTap == null) { 8471 mPendingCheckForTap = new CheckForTap(); 8472 } 8473 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8474 } else { 8475 // Not inside a scrolling container, so show the feedback right away 8476 setPressed(true); 8477 checkForLongClick(0); 8478 } 8479 break; 8480 8481 case MotionEvent.ACTION_CANCEL: 8482 setPressed(false); 8483 removeTapCallback(); 8484 removeLongPressCallback(); 8485 break; 8486 8487 case MotionEvent.ACTION_MOVE: 8488 final int x = (int) event.getX(); 8489 final int y = (int) event.getY(); 8490 8491 // Be lenient about moving outside of buttons 8492 if (!pointInView(x, y, mTouchSlop)) { 8493 // Outside button 8494 removeTapCallback(); 8495 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8496 // Remove any future long press/tap checks 8497 removeLongPressCallback(); 8498 8499 setPressed(false); 8500 } 8501 } 8502 break; 8503 } 8504 return true; 8505 } 8506 8507 return false; 8508 } 8509 8510 /** 8511 * @hide 8512 */ 8513 public boolean isInScrollingContainer() { 8514 ViewParent p = getParent(); 8515 while (p != null && p instanceof ViewGroup) { 8516 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8517 return true; 8518 } 8519 p = p.getParent(); 8520 } 8521 return false; 8522 } 8523 8524 /** 8525 * Remove the longpress detection timer. 8526 */ 8527 private void removeLongPressCallback() { 8528 if (mPendingCheckForLongPress != null) { 8529 removeCallbacks(mPendingCheckForLongPress); 8530 } 8531 } 8532 8533 /** 8534 * Remove the pending click action 8535 */ 8536 private void removePerformClickCallback() { 8537 if (mPerformClick != null) { 8538 removeCallbacks(mPerformClick); 8539 } 8540 } 8541 8542 /** 8543 * Remove the prepress detection timer. 8544 */ 8545 private void removeUnsetPressCallback() { 8546 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8547 setPressed(false); 8548 removeCallbacks(mUnsetPressedState); 8549 } 8550 } 8551 8552 /** 8553 * Remove the tap detection timer. 8554 */ 8555 private void removeTapCallback() { 8556 if (mPendingCheckForTap != null) { 8557 mPrivateFlags &= ~PFLAG_PREPRESSED; 8558 removeCallbacks(mPendingCheckForTap); 8559 } 8560 } 8561 8562 /** 8563 * Cancels a pending long press. Your subclass can use this if you 8564 * want the context menu to come up if the user presses and holds 8565 * at the same place, but you don't want it to come up if they press 8566 * and then move around enough to cause scrolling. 8567 */ 8568 public void cancelLongPress() { 8569 removeLongPressCallback(); 8570 8571 /* 8572 * The prepressed state handled by the tap callback is a display 8573 * construct, but the tap callback will post a long press callback 8574 * less its own timeout. Remove it here. 8575 */ 8576 removeTapCallback(); 8577 } 8578 8579 /** 8580 * Remove the pending callback for sending a 8581 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8582 */ 8583 private void removeSendViewScrolledAccessibilityEventCallback() { 8584 if (mSendViewScrolledAccessibilityEvent != null) { 8585 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8586 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8587 } 8588 } 8589 8590 /** 8591 * Sets the TouchDelegate for this View. 8592 */ 8593 public void setTouchDelegate(TouchDelegate delegate) { 8594 mTouchDelegate = delegate; 8595 } 8596 8597 /** 8598 * Gets the TouchDelegate for this View. 8599 */ 8600 public TouchDelegate getTouchDelegate() { 8601 return mTouchDelegate; 8602 } 8603 8604 /** 8605 * Set flags controlling behavior of this view. 8606 * 8607 * @param flags Constant indicating the value which should be set 8608 * @param mask Constant indicating the bit range that should be changed 8609 */ 8610 void setFlags(int flags, int mask) { 8611 final boolean accessibilityEnabled = 8612 AccessibilityManager.getInstance(mContext).isEnabled(); 8613 final boolean oldIncludeForAccessibility = accessibilityEnabled && includeForAccessibility(); 8614 8615 int old = mViewFlags; 8616 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8617 8618 int changed = mViewFlags ^ old; 8619 if (changed == 0) { 8620 return; 8621 } 8622 int privateFlags = mPrivateFlags; 8623 8624 /* Check if the FOCUSABLE bit has changed */ 8625 if (((changed & FOCUSABLE_MASK) != 0) && 8626 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8627 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8628 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8629 /* Give up focus if we are no longer focusable */ 8630 clearFocus(); 8631 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8632 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8633 /* 8634 * Tell the view system that we are now available to take focus 8635 * if no one else already has it. 8636 */ 8637 if (mParent != null) mParent.focusableViewAvailable(this); 8638 } 8639 } 8640 8641 final int newVisibility = flags & VISIBILITY_MASK; 8642 if (newVisibility == VISIBLE) { 8643 if ((changed & VISIBILITY_MASK) != 0) { 8644 /* 8645 * If this view is becoming visible, invalidate it in case it changed while 8646 * it was not visible. Marking it drawn ensures that the invalidation will 8647 * go through. 8648 */ 8649 mPrivateFlags |= PFLAG_DRAWN; 8650 invalidate(true); 8651 8652 needGlobalAttributesUpdate(true); 8653 8654 // a view becoming visible is worth notifying the parent 8655 // about in case nothing has focus. even if this specific view 8656 // isn't focusable, it may contain something that is, so let 8657 // the root view try to give this focus if nothing else does. 8658 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8659 mParent.focusableViewAvailable(this); 8660 } 8661 } 8662 } 8663 8664 /* Check if the GONE bit has changed */ 8665 if ((changed & GONE) != 0) { 8666 needGlobalAttributesUpdate(false); 8667 requestLayout(); 8668 8669 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8670 if (hasFocus()) clearFocus(); 8671 clearAccessibilityFocus(); 8672 destroyDrawingCache(); 8673 if (mParent instanceof View) { 8674 // GONE views noop invalidation, so invalidate the parent 8675 ((View) mParent).invalidate(true); 8676 } 8677 // Mark the view drawn to ensure that it gets invalidated properly the next 8678 // time it is visible and gets invalidated 8679 mPrivateFlags |= PFLAG_DRAWN; 8680 } 8681 if (mAttachInfo != null) { 8682 mAttachInfo.mViewVisibilityChanged = true; 8683 } 8684 } 8685 8686 /* Check if the VISIBLE bit has changed */ 8687 if ((changed & INVISIBLE) != 0) { 8688 needGlobalAttributesUpdate(false); 8689 /* 8690 * If this view is becoming invisible, set the DRAWN flag so that 8691 * the next invalidate() will not be skipped. 8692 */ 8693 mPrivateFlags |= PFLAG_DRAWN; 8694 8695 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8696 // root view becoming invisible shouldn't clear focus and accessibility focus 8697 if (getRootView() != this) { 8698 clearFocus(); 8699 clearAccessibilityFocus(); 8700 } 8701 } 8702 if (mAttachInfo != null) { 8703 mAttachInfo.mViewVisibilityChanged = true; 8704 } 8705 } 8706 8707 if ((changed & VISIBILITY_MASK) != 0) { 8708 // If the view is invisible, cleanup its display list to free up resources 8709 if (newVisibility != VISIBLE) { 8710 cleanupDraw(); 8711 } 8712 8713 if (mParent instanceof ViewGroup) { 8714 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8715 (changed & VISIBILITY_MASK), newVisibility); 8716 ((View) mParent).invalidate(true); 8717 } else if (mParent != null) { 8718 mParent.invalidateChild(this, null); 8719 } 8720 dispatchVisibilityChanged(this, newVisibility); 8721 } 8722 8723 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8724 destroyDrawingCache(); 8725 } 8726 8727 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8728 destroyDrawingCache(); 8729 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8730 invalidateParentCaches(); 8731 } 8732 8733 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8734 destroyDrawingCache(); 8735 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8736 } 8737 8738 if ((changed & DRAW_MASK) != 0) { 8739 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8740 if (mBackground != null) { 8741 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8742 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8743 } else { 8744 mPrivateFlags |= PFLAG_SKIP_DRAW; 8745 } 8746 } else { 8747 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8748 } 8749 requestLayout(); 8750 invalidate(true); 8751 } 8752 8753 if ((changed & KEEP_SCREEN_ON) != 0) { 8754 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8755 mParent.recomputeViewAttributes(this); 8756 } 8757 } 8758 8759 if (accessibilityEnabled) { 8760 if ((changed & FOCUSABLE_MASK) != 0 || (changed & VISIBILITY_MASK) != 0 8761 || (changed & CLICKABLE) != 0 || (changed & LONG_CLICKABLE) != 0) { 8762 if (oldIncludeForAccessibility != includeForAccessibility()) { 8763 notifySubtreeAccessibilityStateChangedIfNeeded(); 8764 } else { 8765 notifyViewAccessibilityStateChangedIfNeeded(); 8766 } 8767 } 8768 if ((changed & ENABLED_MASK) != 0) { 8769 notifyViewAccessibilityStateChangedIfNeeded(); 8770 } 8771 } 8772 } 8773 8774 /** 8775 * Change the view's z order in the tree, so it's on top of other sibling 8776 * views. This ordering change may affect layout, if the parent container 8777 * uses an order-dependent layout scheme (e.g., LinearLayout). This 8778 * method should be followed by calls to {@link #requestLayout()} and 8779 * {@link View#invalidate()} on the parent. 8780 * 8781 * @see ViewGroup#bringChildToFront(View) 8782 */ 8783 public void bringToFront() { 8784 if (mParent != null) { 8785 mParent.bringChildToFront(this); 8786 } 8787 } 8788 8789 /** 8790 * This is called in response to an internal scroll in this view (i.e., the 8791 * view scrolled its own contents). This is typically as a result of 8792 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8793 * called. 8794 * 8795 * @param l Current horizontal scroll origin. 8796 * @param t Current vertical scroll origin. 8797 * @param oldl Previous horizontal scroll origin. 8798 * @param oldt Previous vertical scroll origin. 8799 */ 8800 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8801 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8802 postSendViewScrolledAccessibilityEventCallback(); 8803 } 8804 8805 mBackgroundSizeChanged = true; 8806 8807 final AttachInfo ai = mAttachInfo; 8808 if (ai != null) { 8809 ai.mViewScrollChanged = true; 8810 } 8811 } 8812 8813 /** 8814 * Interface definition for a callback to be invoked when the layout bounds of a view 8815 * changes due to layout processing. 8816 */ 8817 public interface OnLayoutChangeListener { 8818 /** 8819 * Called when the focus state of a view has changed. 8820 * 8821 * @param v The view whose state has changed. 8822 * @param left The new value of the view's left property. 8823 * @param top The new value of the view's top property. 8824 * @param right The new value of the view's right property. 8825 * @param bottom The new value of the view's bottom property. 8826 * @param oldLeft The previous value of the view's left property. 8827 * @param oldTop The previous value of the view's top property. 8828 * @param oldRight The previous value of the view's right property. 8829 * @param oldBottom The previous value of the view's bottom property. 8830 */ 8831 void onLayoutChange(View v, int left, int top, int right, int bottom, 8832 int oldLeft, int oldTop, int oldRight, int oldBottom); 8833 } 8834 8835 /** 8836 * This is called during layout when the size of this view has changed. If 8837 * you were just added to the view hierarchy, you're called with the old 8838 * values of 0. 8839 * 8840 * @param w Current width of this view. 8841 * @param h Current height of this view. 8842 * @param oldw Old width of this view. 8843 * @param oldh Old height of this view. 8844 */ 8845 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8846 } 8847 8848 /** 8849 * Called by draw to draw the child views. This may be overridden 8850 * by derived classes to gain control just before its children are drawn 8851 * (but after its own view has been drawn). 8852 * @param canvas the canvas on which to draw the view 8853 */ 8854 protected void dispatchDraw(Canvas canvas) { 8855 8856 } 8857 8858 /** 8859 * Gets the parent of this view. Note that the parent is a 8860 * ViewParent and not necessarily a View. 8861 * 8862 * @return Parent of this view. 8863 */ 8864 public final ViewParent getParent() { 8865 return mParent; 8866 } 8867 8868 /** 8869 * Set the horizontal scrolled position of your view. This will cause a call to 8870 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8871 * invalidated. 8872 * @param value the x position to scroll to 8873 */ 8874 public void setScrollX(int value) { 8875 scrollTo(value, mScrollY); 8876 } 8877 8878 /** 8879 * Set the vertical scrolled position of your view. This will cause a call to 8880 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8881 * invalidated. 8882 * @param value the y position to scroll to 8883 */ 8884 public void setScrollY(int value) { 8885 scrollTo(mScrollX, value); 8886 } 8887 8888 /** 8889 * Return the scrolled left position of this view. This is the left edge of 8890 * the displayed part of your view. You do not need to draw any pixels 8891 * farther left, since those are outside of the frame of your view on 8892 * screen. 8893 * 8894 * @return The left edge of the displayed part of your view, in pixels. 8895 */ 8896 public final int getScrollX() { 8897 return mScrollX; 8898 } 8899 8900 /** 8901 * Return the scrolled top position of this view. This is the top edge of 8902 * the displayed part of your view. You do not need to draw any pixels above 8903 * it, since those are outside of the frame of your view on screen. 8904 * 8905 * @return The top edge of the displayed part of your view, in pixels. 8906 */ 8907 public final int getScrollY() { 8908 return mScrollY; 8909 } 8910 8911 /** 8912 * Return the width of the your view. 8913 * 8914 * @return The width of your view, in pixels. 8915 */ 8916 @ViewDebug.ExportedProperty(category = "layout") 8917 public final int getWidth() { 8918 return mRight - mLeft; 8919 } 8920 8921 /** 8922 * Return the height of your view. 8923 * 8924 * @return The height of your view, in pixels. 8925 */ 8926 @ViewDebug.ExportedProperty(category = "layout") 8927 public final int getHeight() { 8928 return mBottom - mTop; 8929 } 8930 8931 /** 8932 * Return the visible drawing bounds of your view. Fills in the output 8933 * rectangle with the values from getScrollX(), getScrollY(), 8934 * getWidth(), and getHeight(). These bounds do not account for any 8935 * transformation properties currently set on the view, such as 8936 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 8937 * 8938 * @param outRect The (scrolled) drawing bounds of the view. 8939 */ 8940 public void getDrawingRect(Rect outRect) { 8941 outRect.left = mScrollX; 8942 outRect.top = mScrollY; 8943 outRect.right = mScrollX + (mRight - mLeft); 8944 outRect.bottom = mScrollY + (mBottom - mTop); 8945 } 8946 8947 /** 8948 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8949 * raw width component (that is the result is masked by 8950 * {@link #MEASURED_SIZE_MASK}). 8951 * 8952 * @return The raw measured width of this view. 8953 */ 8954 public final int getMeasuredWidth() { 8955 return mMeasuredWidth & MEASURED_SIZE_MASK; 8956 } 8957 8958 /** 8959 * Return the full width measurement information for this view as computed 8960 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8961 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8962 * This should be used during measurement and layout calculations only. Use 8963 * {@link #getWidth()} to see how wide a view is after layout. 8964 * 8965 * @return The measured width of this view as a bit mask. 8966 */ 8967 public final int getMeasuredWidthAndState() { 8968 return mMeasuredWidth; 8969 } 8970 8971 /** 8972 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8973 * raw width component (that is the result is masked by 8974 * {@link #MEASURED_SIZE_MASK}). 8975 * 8976 * @return The raw measured height of this view. 8977 */ 8978 public final int getMeasuredHeight() { 8979 return mMeasuredHeight & MEASURED_SIZE_MASK; 8980 } 8981 8982 /** 8983 * Return the full height measurement information for this view as computed 8984 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8985 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8986 * This should be used during measurement and layout calculations only. Use 8987 * {@link #getHeight()} to see how wide a view is after layout. 8988 * 8989 * @return The measured width of this view as a bit mask. 8990 */ 8991 public final int getMeasuredHeightAndState() { 8992 return mMeasuredHeight; 8993 } 8994 8995 /** 8996 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8997 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8998 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8999 * and the height component is at the shifted bits 9000 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 9001 */ 9002 public final int getMeasuredState() { 9003 return (mMeasuredWidth&MEASURED_STATE_MASK) 9004 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 9005 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 9006 } 9007 9008 /** 9009 * The transform matrix of this view, which is calculated based on the current 9010 * roation, scale, and pivot properties. 9011 * 9012 * @see #getRotation() 9013 * @see #getScaleX() 9014 * @see #getScaleY() 9015 * @see #getPivotX() 9016 * @see #getPivotY() 9017 * @return The current transform matrix for the view 9018 */ 9019 public Matrix getMatrix() { 9020 if (mTransformationInfo != null) { 9021 updateMatrix(); 9022 return mTransformationInfo.mMatrix; 9023 } 9024 return Matrix.IDENTITY_MATRIX; 9025 } 9026 9027 /** 9028 * Utility function to determine if the value is far enough away from zero to be 9029 * considered non-zero. 9030 * @param value A floating point value to check for zero-ness 9031 * @return whether the passed-in value is far enough away from zero to be considered non-zero 9032 */ 9033 private static boolean nonzero(float value) { 9034 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 9035 } 9036 9037 /** 9038 * Returns true if the transform matrix is the identity matrix. 9039 * Recomputes the matrix if necessary. 9040 * 9041 * @return True if the transform matrix is the identity matrix, false otherwise. 9042 */ 9043 final boolean hasIdentityMatrix() { 9044 if (mTransformationInfo != null) { 9045 updateMatrix(); 9046 return mTransformationInfo.mMatrixIsIdentity; 9047 } 9048 return true; 9049 } 9050 9051 void ensureTransformationInfo() { 9052 if (mTransformationInfo == null) { 9053 mTransformationInfo = new TransformationInfo(); 9054 } 9055 } 9056 9057 /** 9058 * Recomputes the transform matrix if necessary. 9059 */ 9060 private void updateMatrix() { 9061 final TransformationInfo info = mTransformationInfo; 9062 if (info == null) { 9063 return; 9064 } 9065 if (info.mMatrixDirty) { 9066 // transform-related properties have changed since the last time someone 9067 // asked for the matrix; recalculate it with the current values 9068 9069 // Figure out if we need to update the pivot point 9070 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9071 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 9072 info.mPrevWidth = mRight - mLeft; 9073 info.mPrevHeight = mBottom - mTop; 9074 info.mPivotX = info.mPrevWidth / 2f; 9075 info.mPivotY = info.mPrevHeight / 2f; 9076 } 9077 } 9078 info.mMatrix.reset(); 9079 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 9080 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 9081 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 9082 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9083 } else { 9084 if (info.mCamera == null) { 9085 info.mCamera = new Camera(); 9086 info.matrix3D = new Matrix(); 9087 } 9088 info.mCamera.save(); 9089 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9090 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 9091 info.mCamera.getMatrix(info.matrix3D); 9092 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 9093 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 9094 info.mPivotY + info.mTranslationY); 9095 info.mMatrix.postConcat(info.matrix3D); 9096 info.mCamera.restore(); 9097 } 9098 info.mMatrixDirty = false; 9099 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 9100 info.mInverseMatrixDirty = true; 9101 } 9102 } 9103 9104 /** 9105 * Utility method to retrieve the inverse of the current mMatrix property. 9106 * We cache the matrix to avoid recalculating it when transform properties 9107 * have not changed. 9108 * 9109 * @return The inverse of the current matrix of this view. 9110 */ 9111 final Matrix getInverseMatrix() { 9112 final TransformationInfo info = mTransformationInfo; 9113 if (info != null) { 9114 updateMatrix(); 9115 if (info.mInverseMatrixDirty) { 9116 if (info.mInverseMatrix == null) { 9117 info.mInverseMatrix = new Matrix(); 9118 } 9119 info.mMatrix.invert(info.mInverseMatrix); 9120 info.mInverseMatrixDirty = false; 9121 } 9122 return info.mInverseMatrix; 9123 } 9124 return Matrix.IDENTITY_MATRIX; 9125 } 9126 9127 /** 9128 * Gets the distance along the Z axis from the camera to this view. 9129 * 9130 * @see #setCameraDistance(float) 9131 * 9132 * @return The distance along the Z axis. 9133 */ 9134 public float getCameraDistance() { 9135 ensureTransformationInfo(); 9136 final float dpi = mResources.getDisplayMetrics().densityDpi; 9137 final TransformationInfo info = mTransformationInfo; 9138 if (info.mCamera == null) { 9139 info.mCamera = new Camera(); 9140 info.matrix3D = new Matrix(); 9141 } 9142 return -(info.mCamera.getLocationZ() * dpi); 9143 } 9144 9145 /** 9146 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 9147 * views are drawn) from the camera to this view. The camera's distance 9148 * affects 3D transformations, for instance rotations around the X and Y 9149 * axis. If the rotationX or rotationY properties are changed and this view is 9150 * large (more than half the size of the screen), it is recommended to always 9151 * use a camera distance that's greater than the height (X axis rotation) or 9152 * the width (Y axis rotation) of this view.</p> 9153 * 9154 * <p>The distance of the camera from the view plane can have an affect on the 9155 * perspective distortion of the view when it is rotated around the x or y axis. 9156 * For example, a large distance will result in a large viewing angle, and there 9157 * will not be much perspective distortion of the view as it rotates. A short 9158 * distance may cause much more perspective distortion upon rotation, and can 9159 * also result in some drawing artifacts if the rotated view ends up partially 9160 * behind the camera (which is why the recommendation is to use a distance at 9161 * least as far as the size of the view, if the view is to be rotated.)</p> 9162 * 9163 * <p>The distance is expressed in "depth pixels." The default distance depends 9164 * on the screen density. For instance, on a medium density display, the 9165 * default distance is 1280. On a high density display, the default distance 9166 * is 1920.</p> 9167 * 9168 * <p>If you want to specify a distance that leads to visually consistent 9169 * results across various densities, use the following formula:</p> 9170 * <pre> 9171 * float scale = context.getResources().getDisplayMetrics().density; 9172 * view.setCameraDistance(distance * scale); 9173 * </pre> 9174 * 9175 * <p>The density scale factor of a high density display is 1.5, 9176 * and 1920 = 1280 * 1.5.</p> 9177 * 9178 * @param distance The distance in "depth pixels", if negative the opposite 9179 * value is used 9180 * 9181 * @see #setRotationX(float) 9182 * @see #setRotationY(float) 9183 */ 9184 public void setCameraDistance(float distance) { 9185 invalidateViewProperty(true, false); 9186 9187 ensureTransformationInfo(); 9188 final float dpi = mResources.getDisplayMetrics().densityDpi; 9189 final TransformationInfo info = mTransformationInfo; 9190 if (info.mCamera == null) { 9191 info.mCamera = new Camera(); 9192 info.matrix3D = new Matrix(); 9193 } 9194 9195 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 9196 info.mMatrixDirty = true; 9197 9198 invalidateViewProperty(false, false); 9199 if (mDisplayList != null) { 9200 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 9201 } 9202 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9203 // View was rejected last time it was drawn by its parent; this may have changed 9204 invalidateParentIfNeeded(); 9205 } 9206 } 9207 9208 /** 9209 * The degrees that the view is rotated around the pivot point. 9210 * 9211 * @see #setRotation(float) 9212 * @see #getPivotX() 9213 * @see #getPivotY() 9214 * 9215 * @return The degrees of rotation. 9216 */ 9217 @ViewDebug.ExportedProperty(category = "drawing") 9218 public float getRotation() { 9219 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 9220 } 9221 9222 /** 9223 * Sets the degrees that the view is rotated around the pivot point. Increasing values 9224 * result in clockwise rotation. 9225 * 9226 * @param rotation The degrees of rotation. 9227 * 9228 * @see #getRotation() 9229 * @see #getPivotX() 9230 * @see #getPivotY() 9231 * @see #setRotationX(float) 9232 * @see #setRotationY(float) 9233 * 9234 * @attr ref android.R.styleable#View_rotation 9235 */ 9236 public void setRotation(float rotation) { 9237 ensureTransformationInfo(); 9238 final TransformationInfo info = mTransformationInfo; 9239 if (info.mRotation != rotation) { 9240 // Double-invalidation is necessary to capture view's old and new areas 9241 invalidateViewProperty(true, false); 9242 info.mRotation = rotation; 9243 info.mMatrixDirty = true; 9244 invalidateViewProperty(false, true); 9245 if (mDisplayList != null) { 9246 mDisplayList.setRotation(rotation); 9247 } 9248 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9249 // View was rejected last time it was drawn by its parent; this may have changed 9250 invalidateParentIfNeeded(); 9251 } 9252 } 9253 } 9254 9255 /** 9256 * The degrees that the view is rotated around the vertical axis through the pivot point. 9257 * 9258 * @see #getPivotX() 9259 * @see #getPivotY() 9260 * @see #setRotationY(float) 9261 * 9262 * @return The degrees of Y rotation. 9263 */ 9264 @ViewDebug.ExportedProperty(category = "drawing") 9265 public float getRotationY() { 9266 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 9267 } 9268 9269 /** 9270 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9271 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9272 * down the y axis. 9273 * 9274 * When rotating large views, it is recommended to adjust the camera distance 9275 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9276 * 9277 * @param rotationY The degrees of Y rotation. 9278 * 9279 * @see #getRotationY() 9280 * @see #getPivotX() 9281 * @see #getPivotY() 9282 * @see #setRotation(float) 9283 * @see #setRotationX(float) 9284 * @see #setCameraDistance(float) 9285 * 9286 * @attr ref android.R.styleable#View_rotationY 9287 */ 9288 public void setRotationY(float rotationY) { 9289 ensureTransformationInfo(); 9290 final TransformationInfo info = mTransformationInfo; 9291 if (info.mRotationY != rotationY) { 9292 invalidateViewProperty(true, false); 9293 info.mRotationY = rotationY; 9294 info.mMatrixDirty = true; 9295 invalidateViewProperty(false, true); 9296 if (mDisplayList != null) { 9297 mDisplayList.setRotationY(rotationY); 9298 } 9299 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9300 // View was rejected last time it was drawn by its parent; this may have changed 9301 invalidateParentIfNeeded(); 9302 } 9303 } 9304 } 9305 9306 /** 9307 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9308 * 9309 * @see #getPivotX() 9310 * @see #getPivotY() 9311 * @see #setRotationX(float) 9312 * 9313 * @return The degrees of X rotation. 9314 */ 9315 @ViewDebug.ExportedProperty(category = "drawing") 9316 public float getRotationX() { 9317 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9318 } 9319 9320 /** 9321 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9322 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9323 * x axis. 9324 * 9325 * When rotating large views, it is recommended to adjust the camera distance 9326 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9327 * 9328 * @param rotationX The degrees of X rotation. 9329 * 9330 * @see #getRotationX() 9331 * @see #getPivotX() 9332 * @see #getPivotY() 9333 * @see #setRotation(float) 9334 * @see #setRotationY(float) 9335 * @see #setCameraDistance(float) 9336 * 9337 * @attr ref android.R.styleable#View_rotationX 9338 */ 9339 public void setRotationX(float rotationX) { 9340 ensureTransformationInfo(); 9341 final TransformationInfo info = mTransformationInfo; 9342 if (info.mRotationX != rotationX) { 9343 invalidateViewProperty(true, false); 9344 info.mRotationX = rotationX; 9345 info.mMatrixDirty = true; 9346 invalidateViewProperty(false, true); 9347 if (mDisplayList != null) { 9348 mDisplayList.setRotationX(rotationX); 9349 } 9350 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9351 // View was rejected last time it was drawn by its parent; this may have changed 9352 invalidateParentIfNeeded(); 9353 } 9354 } 9355 } 9356 9357 /** 9358 * The amount that the view is scaled in x around the pivot point, as a proportion of 9359 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9360 * 9361 * <p>By default, this is 1.0f. 9362 * 9363 * @see #getPivotX() 9364 * @see #getPivotY() 9365 * @return The scaling factor. 9366 */ 9367 @ViewDebug.ExportedProperty(category = "drawing") 9368 public float getScaleX() { 9369 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9370 } 9371 9372 /** 9373 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9374 * the view's unscaled width. A value of 1 means that no scaling is applied. 9375 * 9376 * @param scaleX The scaling factor. 9377 * @see #getPivotX() 9378 * @see #getPivotY() 9379 * 9380 * @attr ref android.R.styleable#View_scaleX 9381 */ 9382 public void setScaleX(float scaleX) { 9383 ensureTransformationInfo(); 9384 final TransformationInfo info = mTransformationInfo; 9385 if (info.mScaleX != scaleX) { 9386 invalidateViewProperty(true, false); 9387 info.mScaleX = scaleX; 9388 info.mMatrixDirty = true; 9389 invalidateViewProperty(false, true); 9390 if (mDisplayList != null) { 9391 mDisplayList.setScaleX(scaleX); 9392 } 9393 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9394 // View was rejected last time it was drawn by its parent; this may have changed 9395 invalidateParentIfNeeded(); 9396 } 9397 } 9398 } 9399 9400 /** 9401 * The amount that the view is scaled in y around the pivot point, as a proportion of 9402 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9403 * 9404 * <p>By default, this is 1.0f. 9405 * 9406 * @see #getPivotX() 9407 * @see #getPivotY() 9408 * @return The scaling factor. 9409 */ 9410 @ViewDebug.ExportedProperty(category = "drawing") 9411 public float getScaleY() { 9412 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9413 } 9414 9415 /** 9416 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9417 * the view's unscaled width. A value of 1 means that no scaling is applied. 9418 * 9419 * @param scaleY The scaling factor. 9420 * @see #getPivotX() 9421 * @see #getPivotY() 9422 * 9423 * @attr ref android.R.styleable#View_scaleY 9424 */ 9425 public void setScaleY(float scaleY) { 9426 ensureTransformationInfo(); 9427 final TransformationInfo info = mTransformationInfo; 9428 if (info.mScaleY != scaleY) { 9429 invalidateViewProperty(true, false); 9430 info.mScaleY = scaleY; 9431 info.mMatrixDirty = true; 9432 invalidateViewProperty(false, true); 9433 if (mDisplayList != null) { 9434 mDisplayList.setScaleY(scaleY); 9435 } 9436 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9437 // View was rejected last time it was drawn by its parent; this may have changed 9438 invalidateParentIfNeeded(); 9439 } 9440 } 9441 } 9442 9443 /** 9444 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9445 * and {@link #setScaleX(float) scaled}. 9446 * 9447 * @see #getRotation() 9448 * @see #getScaleX() 9449 * @see #getScaleY() 9450 * @see #getPivotY() 9451 * @return The x location of the pivot point. 9452 * 9453 * @attr ref android.R.styleable#View_transformPivotX 9454 */ 9455 @ViewDebug.ExportedProperty(category = "drawing") 9456 public float getPivotX() { 9457 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9458 } 9459 9460 /** 9461 * Sets the x location of the point around which the view is 9462 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9463 * By default, the pivot point is centered on the object. 9464 * Setting this property disables this behavior and causes the view to use only the 9465 * explicitly set pivotX and pivotY values. 9466 * 9467 * @param pivotX The x location of the pivot point. 9468 * @see #getRotation() 9469 * @see #getScaleX() 9470 * @see #getScaleY() 9471 * @see #getPivotY() 9472 * 9473 * @attr ref android.R.styleable#View_transformPivotX 9474 */ 9475 public void setPivotX(float pivotX) { 9476 ensureTransformationInfo(); 9477 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9478 final TransformationInfo info = mTransformationInfo; 9479 if (info.mPivotX != pivotX) { 9480 invalidateViewProperty(true, false); 9481 info.mPivotX = pivotX; 9482 info.mMatrixDirty = true; 9483 invalidateViewProperty(false, true); 9484 if (mDisplayList != null) { 9485 mDisplayList.setPivotX(pivotX); 9486 } 9487 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9488 // View was rejected last time it was drawn by its parent; this may have changed 9489 invalidateParentIfNeeded(); 9490 } 9491 } 9492 } 9493 9494 /** 9495 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9496 * and {@link #setScaleY(float) scaled}. 9497 * 9498 * @see #getRotation() 9499 * @see #getScaleX() 9500 * @see #getScaleY() 9501 * @see #getPivotY() 9502 * @return The y location of the pivot point. 9503 * 9504 * @attr ref android.R.styleable#View_transformPivotY 9505 */ 9506 @ViewDebug.ExportedProperty(category = "drawing") 9507 public float getPivotY() { 9508 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9509 } 9510 9511 /** 9512 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9513 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9514 * Setting this property disables this behavior and causes the view to use only the 9515 * explicitly set pivotX and pivotY values. 9516 * 9517 * @param pivotY The y location of the pivot point. 9518 * @see #getRotation() 9519 * @see #getScaleX() 9520 * @see #getScaleY() 9521 * @see #getPivotY() 9522 * 9523 * @attr ref android.R.styleable#View_transformPivotY 9524 */ 9525 public void setPivotY(float pivotY) { 9526 ensureTransformationInfo(); 9527 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9528 final TransformationInfo info = mTransformationInfo; 9529 if (info.mPivotY != pivotY) { 9530 invalidateViewProperty(true, false); 9531 info.mPivotY = pivotY; 9532 info.mMatrixDirty = true; 9533 invalidateViewProperty(false, true); 9534 if (mDisplayList != null) { 9535 mDisplayList.setPivotY(pivotY); 9536 } 9537 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9538 // View was rejected last time it was drawn by its parent; this may have changed 9539 invalidateParentIfNeeded(); 9540 } 9541 } 9542 } 9543 9544 /** 9545 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9546 * completely transparent and 1 means the view is completely opaque. 9547 * 9548 * <p>By default this is 1.0f. 9549 * @return The opacity of the view. 9550 */ 9551 @ViewDebug.ExportedProperty(category = "drawing") 9552 public float getAlpha() { 9553 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9554 } 9555 9556 /** 9557 * Returns whether this View has content which overlaps. This function, intended to be 9558 * overridden by specific View types, is an optimization when alpha is set on a view. If 9559 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 9560 * and then composited it into place, which can be expensive. If the view has no overlapping 9561 * rendering, the view can draw each primitive with the appropriate alpha value directly. 9562 * An example of overlapping rendering is a TextView with a background image, such as a 9563 * Button. An example of non-overlapping rendering is a TextView with no background, or 9564 * an ImageView with only the foreground image. The default implementation returns true; 9565 * subclasses should override if they have cases which can be optimized. 9566 * 9567 * @return true if the content in this view might overlap, false otherwise. 9568 */ 9569 public boolean hasOverlappingRendering() { 9570 return true; 9571 } 9572 9573 /** 9574 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9575 * completely transparent and 1 means the view is completely opaque.</p> 9576 * 9577 * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant 9578 * performance implications, especially for large views. It is best to use the alpha property 9579 * sparingly and transiently, as in the case of fading animations.</p> 9580 * 9581 * <p>For a view with a frequently changing alpha, such as during a fading animation, it is 9582 * strongly recommended for performance reasons to either override 9583 * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a 9584 * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p> 9585 * 9586 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9587 * responsible for applying the opacity itself.</p> 9588 * 9589 * <p>Note that if the view is backed by a 9590 * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a 9591 * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than 9592 * 1.0 will supercede the alpha of the layer paint.</p> 9593 * 9594 * @param alpha The opacity of the view. 9595 * 9596 * @see #hasOverlappingRendering() 9597 * @see #setLayerType(int, android.graphics.Paint) 9598 * 9599 * @attr ref android.R.styleable#View_alpha 9600 */ 9601 public void setAlpha(float alpha) { 9602 ensureTransformationInfo(); 9603 if (mTransformationInfo.mAlpha != alpha) { 9604 mTransformationInfo.mAlpha = alpha; 9605 if (onSetAlpha((int) (alpha * 255))) { 9606 mPrivateFlags |= PFLAG_ALPHA_SET; 9607 // subclass is handling alpha - don't optimize rendering cache invalidation 9608 invalidateParentCaches(); 9609 invalidate(true); 9610 } else { 9611 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9612 invalidateViewProperty(true, false); 9613 if (mDisplayList != null) { 9614 mDisplayList.setAlpha(alpha); 9615 } 9616 } 9617 } 9618 } 9619 9620 /** 9621 * Faster version of setAlpha() which performs the same steps except there are 9622 * no calls to invalidate(). The caller of this function should perform proper invalidation 9623 * on the parent and this object. The return value indicates whether the subclass handles 9624 * alpha (the return value for onSetAlpha()). 9625 * 9626 * @param alpha The new value for the alpha property 9627 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9628 * the new value for the alpha property is different from the old value 9629 */ 9630 boolean setAlphaNoInvalidation(float alpha) { 9631 ensureTransformationInfo(); 9632 if (mTransformationInfo.mAlpha != alpha) { 9633 mTransformationInfo.mAlpha = alpha; 9634 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9635 if (subclassHandlesAlpha) { 9636 mPrivateFlags |= PFLAG_ALPHA_SET; 9637 return true; 9638 } else { 9639 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9640 if (mDisplayList != null) { 9641 mDisplayList.setAlpha(alpha); 9642 } 9643 } 9644 } 9645 return false; 9646 } 9647 9648 /** 9649 * Top position of this view relative to its parent. 9650 * 9651 * @return The top of this view, in pixels. 9652 */ 9653 @ViewDebug.CapturedViewProperty 9654 public final int getTop() { 9655 return mTop; 9656 } 9657 9658 /** 9659 * Sets the top position of this view relative to its parent. This method is meant to be called 9660 * by the layout system and should not generally be called otherwise, because the property 9661 * may be changed at any time by the layout. 9662 * 9663 * @param top The top of this view, in pixels. 9664 */ 9665 public final void setTop(int top) { 9666 if (top != mTop) { 9667 updateMatrix(); 9668 final boolean matrixIsIdentity = mTransformationInfo == null 9669 || mTransformationInfo.mMatrixIsIdentity; 9670 if (matrixIsIdentity) { 9671 if (mAttachInfo != null) { 9672 int minTop; 9673 int yLoc; 9674 if (top < mTop) { 9675 minTop = top; 9676 yLoc = top - mTop; 9677 } else { 9678 minTop = mTop; 9679 yLoc = 0; 9680 } 9681 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9682 } 9683 } else { 9684 // Double-invalidation is necessary to capture view's old and new areas 9685 invalidate(true); 9686 } 9687 9688 int width = mRight - mLeft; 9689 int oldHeight = mBottom - mTop; 9690 9691 mTop = top; 9692 if (mDisplayList != null) { 9693 mDisplayList.setTop(mTop); 9694 } 9695 9696 sizeChange(width, mBottom - mTop, width, oldHeight); 9697 9698 if (!matrixIsIdentity) { 9699 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9700 // A change in dimension means an auto-centered pivot point changes, too 9701 mTransformationInfo.mMatrixDirty = true; 9702 } 9703 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9704 invalidate(true); 9705 } 9706 mBackgroundSizeChanged = true; 9707 invalidateParentIfNeeded(); 9708 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9709 // View was rejected last time it was drawn by its parent; this may have changed 9710 invalidateParentIfNeeded(); 9711 } 9712 } 9713 } 9714 9715 /** 9716 * Bottom position of this view relative to its parent. 9717 * 9718 * @return The bottom of this view, in pixels. 9719 */ 9720 @ViewDebug.CapturedViewProperty 9721 public final int getBottom() { 9722 return mBottom; 9723 } 9724 9725 /** 9726 * True if this view has changed since the last time being drawn. 9727 * 9728 * @return The dirty state of this view. 9729 */ 9730 public boolean isDirty() { 9731 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 9732 } 9733 9734 /** 9735 * Sets the bottom position of this view relative to its parent. This method is meant to be 9736 * called by the layout system and should not generally be called otherwise, because the 9737 * property may be changed at any time by the layout. 9738 * 9739 * @param bottom The bottom of this view, in pixels. 9740 */ 9741 public final void setBottom(int bottom) { 9742 if (bottom != mBottom) { 9743 updateMatrix(); 9744 final boolean matrixIsIdentity = mTransformationInfo == null 9745 || mTransformationInfo.mMatrixIsIdentity; 9746 if (matrixIsIdentity) { 9747 if (mAttachInfo != null) { 9748 int maxBottom; 9749 if (bottom < mBottom) { 9750 maxBottom = mBottom; 9751 } else { 9752 maxBottom = bottom; 9753 } 9754 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9755 } 9756 } else { 9757 // Double-invalidation is necessary to capture view's old and new areas 9758 invalidate(true); 9759 } 9760 9761 int width = mRight - mLeft; 9762 int oldHeight = mBottom - mTop; 9763 9764 mBottom = bottom; 9765 if (mDisplayList != null) { 9766 mDisplayList.setBottom(mBottom); 9767 } 9768 9769 sizeChange(width, mBottom - mTop, width, oldHeight); 9770 9771 if (!matrixIsIdentity) { 9772 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9773 // A change in dimension means an auto-centered pivot point changes, too 9774 mTransformationInfo.mMatrixDirty = true; 9775 } 9776 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9777 invalidate(true); 9778 } 9779 mBackgroundSizeChanged = true; 9780 invalidateParentIfNeeded(); 9781 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9782 // View was rejected last time it was drawn by its parent; this may have changed 9783 invalidateParentIfNeeded(); 9784 } 9785 } 9786 } 9787 9788 /** 9789 * Left position of this view relative to its parent. 9790 * 9791 * @return The left edge of this view, in pixels. 9792 */ 9793 @ViewDebug.CapturedViewProperty 9794 public final int getLeft() { 9795 return mLeft; 9796 } 9797 9798 /** 9799 * Sets the left position of this view relative to its parent. This method is meant to be called 9800 * by the layout system and should not generally be called otherwise, because the property 9801 * may be changed at any time by the layout. 9802 * 9803 * @param left The bottom of this view, in pixels. 9804 */ 9805 public final void setLeft(int left) { 9806 if (left != mLeft) { 9807 updateMatrix(); 9808 final boolean matrixIsIdentity = mTransformationInfo == null 9809 || mTransformationInfo.mMatrixIsIdentity; 9810 if (matrixIsIdentity) { 9811 if (mAttachInfo != null) { 9812 int minLeft; 9813 int xLoc; 9814 if (left < mLeft) { 9815 minLeft = left; 9816 xLoc = left - mLeft; 9817 } else { 9818 minLeft = mLeft; 9819 xLoc = 0; 9820 } 9821 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9822 } 9823 } else { 9824 // Double-invalidation is necessary to capture view's old and new areas 9825 invalidate(true); 9826 } 9827 9828 int oldWidth = mRight - mLeft; 9829 int height = mBottom - mTop; 9830 9831 mLeft = left; 9832 if (mDisplayList != null) { 9833 mDisplayList.setLeft(left); 9834 } 9835 9836 sizeChange(mRight - mLeft, height, oldWidth, height); 9837 9838 if (!matrixIsIdentity) { 9839 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9840 // A change in dimension means an auto-centered pivot point changes, too 9841 mTransformationInfo.mMatrixDirty = true; 9842 } 9843 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9844 invalidate(true); 9845 } 9846 mBackgroundSizeChanged = true; 9847 invalidateParentIfNeeded(); 9848 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9849 // View was rejected last time it was drawn by its parent; this may have changed 9850 invalidateParentIfNeeded(); 9851 } 9852 } 9853 } 9854 9855 /** 9856 * Right position of this view relative to its parent. 9857 * 9858 * @return The right edge of this view, in pixels. 9859 */ 9860 @ViewDebug.CapturedViewProperty 9861 public final int getRight() { 9862 return mRight; 9863 } 9864 9865 /** 9866 * Sets the right position of this view relative to its parent. This method is meant to be called 9867 * by the layout system and should not generally be called otherwise, because the property 9868 * may be changed at any time by the layout. 9869 * 9870 * @param right The bottom of this view, in pixels. 9871 */ 9872 public final void setRight(int right) { 9873 if (right != mRight) { 9874 updateMatrix(); 9875 final boolean matrixIsIdentity = mTransformationInfo == null 9876 || mTransformationInfo.mMatrixIsIdentity; 9877 if (matrixIsIdentity) { 9878 if (mAttachInfo != null) { 9879 int maxRight; 9880 if (right < mRight) { 9881 maxRight = mRight; 9882 } else { 9883 maxRight = right; 9884 } 9885 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9886 } 9887 } else { 9888 // Double-invalidation is necessary to capture view's old and new areas 9889 invalidate(true); 9890 } 9891 9892 int oldWidth = mRight - mLeft; 9893 int height = mBottom - mTop; 9894 9895 mRight = right; 9896 if (mDisplayList != null) { 9897 mDisplayList.setRight(mRight); 9898 } 9899 9900 sizeChange(mRight - mLeft, height, oldWidth, height); 9901 9902 if (!matrixIsIdentity) { 9903 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9904 // A change in dimension means an auto-centered pivot point changes, too 9905 mTransformationInfo.mMatrixDirty = true; 9906 } 9907 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9908 invalidate(true); 9909 } 9910 mBackgroundSizeChanged = true; 9911 invalidateParentIfNeeded(); 9912 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9913 // View was rejected last time it was drawn by its parent; this may have changed 9914 invalidateParentIfNeeded(); 9915 } 9916 } 9917 } 9918 9919 /** 9920 * The visual x position of this view, in pixels. This is equivalent to the 9921 * {@link #setTranslationX(float) translationX} property plus the current 9922 * {@link #getLeft() left} property. 9923 * 9924 * @return The visual x position of this view, in pixels. 9925 */ 9926 @ViewDebug.ExportedProperty(category = "drawing") 9927 public float getX() { 9928 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9929 } 9930 9931 /** 9932 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9933 * {@link #setTranslationX(float) translationX} property to be the difference between 9934 * the x value passed in and the current {@link #getLeft() left} property. 9935 * 9936 * @param x The visual x position of this view, in pixels. 9937 */ 9938 public void setX(float x) { 9939 setTranslationX(x - mLeft); 9940 } 9941 9942 /** 9943 * The visual y position of this view, in pixels. This is equivalent to the 9944 * {@link #setTranslationY(float) translationY} property plus the current 9945 * {@link #getTop() top} property. 9946 * 9947 * @return The visual y position of this view, in pixels. 9948 */ 9949 @ViewDebug.ExportedProperty(category = "drawing") 9950 public float getY() { 9951 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9952 } 9953 9954 /** 9955 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9956 * {@link #setTranslationY(float) translationY} property to be the difference between 9957 * the y value passed in and the current {@link #getTop() top} property. 9958 * 9959 * @param y The visual y position of this view, in pixels. 9960 */ 9961 public void setY(float y) { 9962 setTranslationY(y - mTop); 9963 } 9964 9965 9966 /** 9967 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9968 * This position is post-layout, in addition to wherever the object's 9969 * layout placed it. 9970 * 9971 * @return The horizontal position of this view relative to its left position, in pixels. 9972 */ 9973 @ViewDebug.ExportedProperty(category = "drawing") 9974 public float getTranslationX() { 9975 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9976 } 9977 9978 /** 9979 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9980 * This effectively positions the object post-layout, in addition to wherever the object's 9981 * layout placed it. 9982 * 9983 * @param translationX The horizontal position of this view relative to its left position, 9984 * in pixels. 9985 * 9986 * @attr ref android.R.styleable#View_translationX 9987 */ 9988 public void setTranslationX(float translationX) { 9989 ensureTransformationInfo(); 9990 final TransformationInfo info = mTransformationInfo; 9991 if (info.mTranslationX != translationX) { 9992 // Double-invalidation is necessary to capture view's old and new areas 9993 invalidateViewProperty(true, false); 9994 info.mTranslationX = translationX; 9995 info.mMatrixDirty = true; 9996 invalidateViewProperty(false, true); 9997 if (mDisplayList != null) { 9998 mDisplayList.setTranslationX(translationX); 9999 } 10000 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10001 // View was rejected last time it was drawn by its parent; this may have changed 10002 invalidateParentIfNeeded(); 10003 } 10004 } 10005 } 10006 10007 /** 10008 * The horizontal location of this view relative to its {@link #getTop() top} position. 10009 * This position is post-layout, in addition to wherever the object's 10010 * layout placed it. 10011 * 10012 * @return The vertical position of this view relative to its top position, 10013 * in pixels. 10014 */ 10015 @ViewDebug.ExportedProperty(category = "drawing") 10016 public float getTranslationY() { 10017 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 10018 } 10019 10020 /** 10021 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 10022 * This effectively positions the object post-layout, in addition to wherever the object's 10023 * layout placed it. 10024 * 10025 * @param translationY The vertical position of this view relative to its top position, 10026 * in pixels. 10027 * 10028 * @attr ref android.R.styleable#View_translationY 10029 */ 10030 public void setTranslationY(float translationY) { 10031 ensureTransformationInfo(); 10032 final TransformationInfo info = mTransformationInfo; 10033 if (info.mTranslationY != translationY) { 10034 invalidateViewProperty(true, false); 10035 info.mTranslationY = translationY; 10036 info.mMatrixDirty = true; 10037 invalidateViewProperty(false, true); 10038 if (mDisplayList != null) { 10039 mDisplayList.setTranslationY(translationY); 10040 } 10041 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 10042 // View was rejected last time it was drawn by its parent; this may have changed 10043 invalidateParentIfNeeded(); 10044 } 10045 } 10046 } 10047 10048 /** 10049 * Hit rectangle in parent's coordinates 10050 * 10051 * @param outRect The hit rectangle of the view. 10052 */ 10053 public void getHitRect(Rect outRect) { 10054 updateMatrix(); 10055 final TransformationInfo info = mTransformationInfo; 10056 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 10057 outRect.set(mLeft, mTop, mRight, mBottom); 10058 } else { 10059 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 10060 tmpRect.set(0, 0, getWidth(), getHeight()); 10061 info.mMatrix.mapRect(tmpRect); 10062 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 10063 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 10064 } 10065 } 10066 10067 /** 10068 * Determines whether the given point, in local coordinates is inside the view. 10069 */ 10070 /*package*/ final boolean pointInView(float localX, float localY) { 10071 return localX >= 0 && localX < (mRight - mLeft) 10072 && localY >= 0 && localY < (mBottom - mTop); 10073 } 10074 10075 /** 10076 * Utility method to determine whether the given point, in local coordinates, 10077 * is inside the view, where the area of the view is expanded by the slop factor. 10078 * This method is called while processing touch-move events to determine if the event 10079 * is still within the view. 10080 * 10081 * @hide 10082 */ 10083 public boolean pointInView(float localX, float localY, float slop) { 10084 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 10085 localY < ((mBottom - mTop) + slop); 10086 } 10087 10088 /** 10089 * When a view has focus and the user navigates away from it, the next view is searched for 10090 * starting from the rectangle filled in by this method. 10091 * 10092 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 10093 * of the view. However, if your view maintains some idea of internal selection, 10094 * such as a cursor, or a selected row or column, you should override this method and 10095 * fill in a more specific rectangle. 10096 * 10097 * @param r The rectangle to fill in, in this view's coordinates. 10098 */ 10099 public void getFocusedRect(Rect r) { 10100 getDrawingRect(r); 10101 } 10102 10103 /** 10104 * If some part of this view is not clipped by any of its parents, then 10105 * return that area in r in global (root) coordinates. To convert r to local 10106 * coordinates (without taking possible View rotations into account), offset 10107 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 10108 * If the view is completely clipped or translated out, return false. 10109 * 10110 * @param r If true is returned, r holds the global coordinates of the 10111 * visible portion of this view. 10112 * @param globalOffset If true is returned, globalOffset holds the dx,dy 10113 * between this view and its root. globalOffet may be null. 10114 * @return true if r is non-empty (i.e. part of the view is visible at the 10115 * root level. 10116 */ 10117 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 10118 int width = mRight - mLeft; 10119 int height = mBottom - mTop; 10120 if (width > 0 && height > 0) { 10121 r.set(0, 0, width, height); 10122 if (globalOffset != null) { 10123 globalOffset.set(-mScrollX, -mScrollY); 10124 } 10125 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 10126 } 10127 return false; 10128 } 10129 10130 public final boolean getGlobalVisibleRect(Rect r) { 10131 return getGlobalVisibleRect(r, null); 10132 } 10133 10134 public final boolean getLocalVisibleRect(Rect r) { 10135 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 10136 if (getGlobalVisibleRect(r, offset)) { 10137 r.offset(-offset.x, -offset.y); // make r local 10138 return true; 10139 } 10140 return false; 10141 } 10142 10143 /** 10144 * Offset this view's vertical location by the specified number of pixels. 10145 * 10146 * @param offset the number of pixels to offset the view by 10147 */ 10148 public void offsetTopAndBottom(int offset) { 10149 if (offset != 0) { 10150 updateMatrix(); 10151 final boolean matrixIsIdentity = mTransformationInfo == null 10152 || mTransformationInfo.mMatrixIsIdentity; 10153 if (matrixIsIdentity) { 10154 if (mDisplayList != null) { 10155 invalidateViewProperty(false, false); 10156 } else { 10157 final ViewParent p = mParent; 10158 if (p != null && mAttachInfo != null) { 10159 final Rect r = mAttachInfo.mTmpInvalRect; 10160 int minTop; 10161 int maxBottom; 10162 int yLoc; 10163 if (offset < 0) { 10164 minTop = mTop + offset; 10165 maxBottom = mBottom; 10166 yLoc = offset; 10167 } else { 10168 minTop = mTop; 10169 maxBottom = mBottom + offset; 10170 yLoc = 0; 10171 } 10172 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 10173 p.invalidateChild(this, r); 10174 } 10175 } 10176 } else { 10177 invalidateViewProperty(false, false); 10178 } 10179 10180 mTop += offset; 10181 mBottom += offset; 10182 if (mDisplayList != null) { 10183 mDisplayList.offsetTopAndBottom(offset); 10184 invalidateViewProperty(false, false); 10185 } else { 10186 if (!matrixIsIdentity) { 10187 invalidateViewProperty(false, true); 10188 } 10189 invalidateParentIfNeeded(); 10190 } 10191 } 10192 } 10193 10194 /** 10195 * Offset this view's horizontal location by the specified amount of pixels. 10196 * 10197 * @param offset the number of pixels to offset the view by 10198 */ 10199 public void offsetLeftAndRight(int offset) { 10200 if (offset != 0) { 10201 updateMatrix(); 10202 final boolean matrixIsIdentity = mTransformationInfo == null 10203 || mTransformationInfo.mMatrixIsIdentity; 10204 if (matrixIsIdentity) { 10205 if (mDisplayList != null) { 10206 invalidateViewProperty(false, false); 10207 } else { 10208 final ViewParent p = mParent; 10209 if (p != null && mAttachInfo != null) { 10210 final Rect r = mAttachInfo.mTmpInvalRect; 10211 int minLeft; 10212 int maxRight; 10213 if (offset < 0) { 10214 minLeft = mLeft + offset; 10215 maxRight = mRight; 10216 } else { 10217 minLeft = mLeft; 10218 maxRight = mRight + offset; 10219 } 10220 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 10221 p.invalidateChild(this, r); 10222 } 10223 } 10224 } else { 10225 invalidateViewProperty(false, false); 10226 } 10227 10228 mLeft += offset; 10229 mRight += offset; 10230 if (mDisplayList != null) { 10231 mDisplayList.offsetLeftAndRight(offset); 10232 invalidateViewProperty(false, false); 10233 } else { 10234 if (!matrixIsIdentity) { 10235 invalidateViewProperty(false, true); 10236 } 10237 invalidateParentIfNeeded(); 10238 } 10239 } 10240 } 10241 10242 /** 10243 * Get the LayoutParams associated with this view. All views should have 10244 * layout parameters. These supply parameters to the <i>parent</i> of this 10245 * view specifying how it should be arranged. There are many subclasses of 10246 * ViewGroup.LayoutParams, and these correspond to the different subclasses 10247 * of ViewGroup that are responsible for arranging their children. 10248 * 10249 * This method may return null if this View is not attached to a parent 10250 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 10251 * was not invoked successfully. When a View is attached to a parent 10252 * ViewGroup, this method must not return null. 10253 * 10254 * @return The LayoutParams associated with this view, or null if no 10255 * parameters have been set yet 10256 */ 10257 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 10258 public ViewGroup.LayoutParams getLayoutParams() { 10259 return mLayoutParams; 10260 } 10261 10262 /** 10263 * Set the layout parameters associated with this view. These supply 10264 * parameters to the <i>parent</i> of this view specifying how it should be 10265 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 10266 * correspond to the different subclasses of ViewGroup that are responsible 10267 * for arranging their children. 10268 * 10269 * @param params The layout parameters for this view, cannot be null 10270 */ 10271 public void setLayoutParams(ViewGroup.LayoutParams params) { 10272 if (params == null) { 10273 throw new NullPointerException("Layout parameters cannot be null"); 10274 } 10275 mLayoutParams = params; 10276 resolveLayoutParams(); 10277 if (mParent instanceof ViewGroup) { 10278 ((ViewGroup) mParent).onSetLayoutParams(this, params); 10279 } 10280 requestLayout(); 10281 } 10282 10283 /** 10284 * Resolve the layout parameters depending on the resolved layout direction 10285 * 10286 * @hide 10287 */ 10288 public void resolveLayoutParams() { 10289 if (mLayoutParams != null) { 10290 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10291 } 10292 } 10293 10294 /** 10295 * Set the scrolled position of your view. This will cause a call to 10296 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10297 * invalidated. 10298 * @param x the x position to scroll to 10299 * @param y the y position to scroll to 10300 */ 10301 public void scrollTo(int x, int y) { 10302 if (mScrollX != x || mScrollY != y) { 10303 int oldX = mScrollX; 10304 int oldY = mScrollY; 10305 mScrollX = x; 10306 mScrollY = y; 10307 invalidateParentCaches(); 10308 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10309 if (!awakenScrollBars()) { 10310 postInvalidateOnAnimation(); 10311 } 10312 } 10313 } 10314 10315 /** 10316 * Move the scrolled position of your view. This will cause a call to 10317 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10318 * invalidated. 10319 * @param x the amount of pixels to scroll by horizontally 10320 * @param y the amount of pixels to scroll by vertically 10321 */ 10322 public void scrollBy(int x, int y) { 10323 scrollTo(mScrollX + x, mScrollY + y); 10324 } 10325 10326 /** 10327 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10328 * animation to fade the scrollbars out after a default delay. If a subclass 10329 * provides animated scrolling, the start delay should equal the duration 10330 * of the scrolling animation.</p> 10331 * 10332 * <p>The animation starts only if at least one of the scrollbars is 10333 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10334 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10335 * this method returns true, and false otherwise. If the animation is 10336 * started, this method calls {@link #invalidate()}; in that case the 10337 * caller should not call {@link #invalidate()}.</p> 10338 * 10339 * <p>This method should be invoked every time a subclass directly updates 10340 * the scroll parameters.</p> 10341 * 10342 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10343 * and {@link #scrollTo(int, int)}.</p> 10344 * 10345 * @return true if the animation is played, false otherwise 10346 * 10347 * @see #awakenScrollBars(int) 10348 * @see #scrollBy(int, int) 10349 * @see #scrollTo(int, int) 10350 * @see #isHorizontalScrollBarEnabled() 10351 * @see #isVerticalScrollBarEnabled() 10352 * @see #setHorizontalScrollBarEnabled(boolean) 10353 * @see #setVerticalScrollBarEnabled(boolean) 10354 */ 10355 protected boolean awakenScrollBars() { 10356 return mScrollCache != null && 10357 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10358 } 10359 10360 /** 10361 * Trigger the scrollbars to draw. 10362 * This method differs from awakenScrollBars() only in its default duration. 10363 * initialAwakenScrollBars() will show the scroll bars for longer than 10364 * usual to give the user more of a chance to notice them. 10365 * 10366 * @return true if the animation is played, false otherwise. 10367 */ 10368 private boolean initialAwakenScrollBars() { 10369 return mScrollCache != null && 10370 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10371 } 10372 10373 /** 10374 * <p> 10375 * Trigger the scrollbars to draw. When invoked this method starts an 10376 * animation to fade the scrollbars out after a fixed delay. If a subclass 10377 * provides animated scrolling, the start delay should equal the duration of 10378 * the scrolling animation. 10379 * </p> 10380 * 10381 * <p> 10382 * The animation starts only if at least one of the scrollbars is enabled, 10383 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10384 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10385 * this method returns true, and false otherwise. If the animation is 10386 * started, this method calls {@link #invalidate()}; in that case the caller 10387 * should not call {@link #invalidate()}. 10388 * </p> 10389 * 10390 * <p> 10391 * This method should be invoked everytime a subclass directly updates the 10392 * scroll parameters. 10393 * </p> 10394 * 10395 * @param startDelay the delay, in milliseconds, after which the animation 10396 * should start; when the delay is 0, the animation starts 10397 * immediately 10398 * @return true if the animation is played, false otherwise 10399 * 10400 * @see #scrollBy(int, int) 10401 * @see #scrollTo(int, int) 10402 * @see #isHorizontalScrollBarEnabled() 10403 * @see #isVerticalScrollBarEnabled() 10404 * @see #setHorizontalScrollBarEnabled(boolean) 10405 * @see #setVerticalScrollBarEnabled(boolean) 10406 */ 10407 protected boolean awakenScrollBars(int startDelay) { 10408 return awakenScrollBars(startDelay, true); 10409 } 10410 10411 /** 10412 * <p> 10413 * Trigger the scrollbars to draw. When invoked this method starts an 10414 * animation to fade the scrollbars out after a fixed delay. If a subclass 10415 * provides animated scrolling, the start delay should equal the duration of 10416 * the scrolling animation. 10417 * </p> 10418 * 10419 * <p> 10420 * The animation starts only if at least one of the scrollbars is enabled, 10421 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10422 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10423 * this method returns true, and false otherwise. If the animation is 10424 * started, this method calls {@link #invalidate()} if the invalidate parameter 10425 * is set to true; in that case the caller 10426 * should not call {@link #invalidate()}. 10427 * </p> 10428 * 10429 * <p> 10430 * This method should be invoked everytime a subclass directly updates the 10431 * scroll parameters. 10432 * </p> 10433 * 10434 * @param startDelay the delay, in milliseconds, after which the animation 10435 * should start; when the delay is 0, the animation starts 10436 * immediately 10437 * 10438 * @param invalidate Wheter this method should call invalidate 10439 * 10440 * @return true if the animation is played, false otherwise 10441 * 10442 * @see #scrollBy(int, int) 10443 * @see #scrollTo(int, int) 10444 * @see #isHorizontalScrollBarEnabled() 10445 * @see #isVerticalScrollBarEnabled() 10446 * @see #setHorizontalScrollBarEnabled(boolean) 10447 * @see #setVerticalScrollBarEnabled(boolean) 10448 */ 10449 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10450 final ScrollabilityCache scrollCache = mScrollCache; 10451 10452 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10453 return false; 10454 } 10455 10456 if (scrollCache.scrollBar == null) { 10457 scrollCache.scrollBar = new ScrollBarDrawable(); 10458 } 10459 10460 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10461 10462 if (invalidate) { 10463 // Invalidate to show the scrollbars 10464 postInvalidateOnAnimation(); 10465 } 10466 10467 if (scrollCache.state == ScrollabilityCache.OFF) { 10468 // FIXME: this is copied from WindowManagerService. 10469 // We should get this value from the system when it 10470 // is possible to do so. 10471 final int KEY_REPEAT_FIRST_DELAY = 750; 10472 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10473 } 10474 10475 // Tell mScrollCache when we should start fading. This may 10476 // extend the fade start time if one was already scheduled 10477 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10478 scrollCache.fadeStartTime = fadeStartTime; 10479 scrollCache.state = ScrollabilityCache.ON; 10480 10481 // Schedule our fader to run, unscheduling any old ones first 10482 if (mAttachInfo != null) { 10483 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10484 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10485 } 10486 10487 return true; 10488 } 10489 10490 return false; 10491 } 10492 10493 /** 10494 * Do not invalidate views which are not visible and which are not running an animation. They 10495 * will not get drawn and they should not set dirty flags as if they will be drawn 10496 */ 10497 private boolean skipInvalidate() { 10498 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10499 (!(mParent instanceof ViewGroup) || 10500 !((ViewGroup) mParent).isViewTransitioning(this)); 10501 } 10502 /** 10503 * Mark the area defined by dirty as needing to be drawn. If the view is 10504 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10505 * in the future. This must be called from a UI thread. To call from a non-UI 10506 * thread, call {@link #postInvalidate()}. 10507 * 10508 * WARNING: This method is destructive to dirty. 10509 * @param dirty the rectangle representing the bounds of the dirty region 10510 */ 10511 public void invalidate(Rect dirty) { 10512 if (skipInvalidate()) { 10513 return; 10514 } 10515 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10516 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10517 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10518 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10519 mPrivateFlags |= PFLAG_INVALIDATED; 10520 mPrivateFlags |= PFLAG_DIRTY; 10521 final ViewParent p = mParent; 10522 final AttachInfo ai = mAttachInfo; 10523 //noinspection PointlessBooleanExpression,ConstantConditions 10524 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10525 if (p != null && ai != null && ai.mHardwareAccelerated) { 10526 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10527 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10528 p.invalidateChild(this, null); 10529 return; 10530 } 10531 } 10532 if (p != null && ai != null) { 10533 final int scrollX = mScrollX; 10534 final int scrollY = mScrollY; 10535 final Rect r = ai.mTmpInvalRect; 10536 r.set(dirty.left - scrollX, dirty.top - scrollY, 10537 dirty.right - scrollX, dirty.bottom - scrollY); 10538 mParent.invalidateChild(this, r); 10539 } 10540 } 10541 } 10542 10543 /** 10544 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10545 * The coordinates of the dirty rect are relative to the view. 10546 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10547 * will be called at some point in the future. This must be called from 10548 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10549 * @param l the left position of the dirty region 10550 * @param t the top position of the dirty region 10551 * @param r the right position of the dirty region 10552 * @param b the bottom position of the dirty region 10553 */ 10554 public void invalidate(int l, int t, int r, int b) { 10555 if (skipInvalidate()) { 10556 return; 10557 } 10558 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10559 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10560 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10561 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10562 mPrivateFlags |= PFLAG_INVALIDATED; 10563 mPrivateFlags |= PFLAG_DIRTY; 10564 final ViewParent p = mParent; 10565 final AttachInfo ai = mAttachInfo; 10566 //noinspection PointlessBooleanExpression,ConstantConditions 10567 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10568 if (p != null && ai != null && ai.mHardwareAccelerated) { 10569 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10570 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10571 p.invalidateChild(this, null); 10572 return; 10573 } 10574 } 10575 if (p != null && ai != null && l < r && t < b) { 10576 final int scrollX = mScrollX; 10577 final int scrollY = mScrollY; 10578 final Rect tmpr = ai.mTmpInvalRect; 10579 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10580 p.invalidateChild(this, tmpr); 10581 } 10582 } 10583 } 10584 10585 /** 10586 * Invalidate the whole view. If the view is visible, 10587 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10588 * the future. This must be called from a UI thread. To call from a non-UI thread, 10589 * call {@link #postInvalidate()}. 10590 */ 10591 public void invalidate() { 10592 invalidate(true); 10593 } 10594 10595 /** 10596 * This is where the invalidate() work actually happens. A full invalidate() 10597 * causes the drawing cache to be invalidated, but this function can be called with 10598 * invalidateCache set to false to skip that invalidation step for cases that do not 10599 * need it (for example, a component that remains at the same dimensions with the same 10600 * content). 10601 * 10602 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10603 * well. This is usually true for a full invalidate, but may be set to false if the 10604 * View's contents or dimensions have not changed. 10605 */ 10606 void invalidate(boolean invalidateCache) { 10607 if (skipInvalidate()) { 10608 return; 10609 } 10610 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10611 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10612 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10613 mLastIsOpaque = isOpaque(); 10614 mPrivateFlags &= ~PFLAG_DRAWN; 10615 mPrivateFlags |= PFLAG_DIRTY; 10616 if (invalidateCache) { 10617 mPrivateFlags |= PFLAG_INVALIDATED; 10618 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10619 } 10620 final AttachInfo ai = mAttachInfo; 10621 final ViewParent p = mParent; 10622 //noinspection PointlessBooleanExpression,ConstantConditions 10623 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10624 if (p != null && ai != null && ai.mHardwareAccelerated) { 10625 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10626 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10627 p.invalidateChild(this, null); 10628 return; 10629 } 10630 } 10631 10632 if (p != null && ai != null) { 10633 final Rect r = ai.mTmpInvalRect; 10634 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10635 // Don't call invalidate -- we don't want to internally scroll 10636 // our own bounds 10637 p.invalidateChild(this, r); 10638 } 10639 } 10640 } 10641 10642 /** 10643 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10644 * set any flags or handle all of the cases handled by the default invalidation methods. 10645 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10646 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10647 * walk up the hierarchy, transforming the dirty rect as necessary. 10648 * 10649 * The method also handles normal invalidation logic if display list properties are not 10650 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10651 * backup approach, to handle these cases used in the various property-setting methods. 10652 * 10653 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10654 * are not being used in this view 10655 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10656 * list properties are not being used in this view 10657 */ 10658 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10659 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10660 if (invalidateParent) { 10661 invalidateParentCaches(); 10662 } 10663 if (forceRedraw) { 10664 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10665 } 10666 invalidate(false); 10667 } else { 10668 final AttachInfo ai = mAttachInfo; 10669 final ViewParent p = mParent; 10670 if (p != null && ai != null) { 10671 final Rect r = ai.mTmpInvalRect; 10672 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10673 if (mParent instanceof ViewGroup) { 10674 ((ViewGroup) mParent).invalidateChildFast(this, r); 10675 } else { 10676 mParent.invalidateChild(this, r); 10677 } 10678 } 10679 } 10680 } 10681 10682 /** 10683 * Utility method to transform a given Rect by the current matrix of this view. 10684 */ 10685 void transformRect(final Rect rect) { 10686 if (!getMatrix().isIdentity()) { 10687 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10688 boundingRect.set(rect); 10689 getMatrix().mapRect(boundingRect); 10690 rect.set((int) Math.floor(boundingRect.left), 10691 (int) Math.floor(boundingRect.top), 10692 (int) Math.ceil(boundingRect.right), 10693 (int) Math.ceil(boundingRect.bottom)); 10694 } 10695 } 10696 10697 /** 10698 * Used to indicate that the parent of this view should clear its caches. This functionality 10699 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10700 * which is necessary when various parent-managed properties of the view change, such as 10701 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10702 * clears the parent caches and does not causes an invalidate event. 10703 * 10704 * @hide 10705 */ 10706 protected void invalidateParentCaches() { 10707 if (mParent instanceof View) { 10708 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10709 } 10710 } 10711 10712 /** 10713 * Used to indicate that the parent of this view should be invalidated. This functionality 10714 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10715 * which is necessary when various parent-managed properties of the view change, such as 10716 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10717 * an invalidation event to the parent. 10718 * 10719 * @hide 10720 */ 10721 protected void invalidateParentIfNeeded() { 10722 if (isHardwareAccelerated() && mParent instanceof View) { 10723 ((View) mParent).invalidate(true); 10724 } 10725 } 10726 10727 /** 10728 * Indicates whether this View is opaque. An opaque View guarantees that it will 10729 * draw all the pixels overlapping its bounds using a fully opaque color. 10730 * 10731 * Subclasses of View should override this method whenever possible to indicate 10732 * whether an instance is opaque. Opaque Views are treated in a special way by 10733 * the View hierarchy, possibly allowing it to perform optimizations during 10734 * invalidate/draw passes. 10735 * 10736 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10737 */ 10738 @ViewDebug.ExportedProperty(category = "drawing") 10739 public boolean isOpaque() { 10740 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 10741 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10742 } 10743 10744 /** 10745 * @hide 10746 */ 10747 protected void computeOpaqueFlags() { 10748 // Opaque if: 10749 // - Has a background 10750 // - Background is opaque 10751 // - Doesn't have scrollbars or scrollbars overlay 10752 10753 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10754 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 10755 } else { 10756 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 10757 } 10758 10759 final int flags = mViewFlags; 10760 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10761 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || 10762 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { 10763 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 10764 } else { 10765 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 10766 } 10767 } 10768 10769 /** 10770 * @hide 10771 */ 10772 protected boolean hasOpaqueScrollbars() { 10773 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 10774 } 10775 10776 /** 10777 * @return A handler associated with the thread running the View. This 10778 * handler can be used to pump events in the UI events queue. 10779 */ 10780 public Handler getHandler() { 10781 final AttachInfo attachInfo = mAttachInfo; 10782 if (attachInfo != null) { 10783 return attachInfo.mHandler; 10784 } 10785 return null; 10786 } 10787 10788 /** 10789 * Gets the view root associated with the View. 10790 * @return The view root, or null if none. 10791 * @hide 10792 */ 10793 public ViewRootImpl getViewRootImpl() { 10794 if (mAttachInfo != null) { 10795 return mAttachInfo.mViewRootImpl; 10796 } 10797 return null; 10798 } 10799 10800 /** 10801 * <p>Causes the Runnable to be added to the message queue. 10802 * The runnable will be run on the user interface thread.</p> 10803 * 10804 * @param action The Runnable that will be executed. 10805 * 10806 * @return Returns true if the Runnable was successfully placed in to the 10807 * message queue. Returns false on failure, usually because the 10808 * looper processing the message queue is exiting. 10809 * 10810 * @see #postDelayed 10811 * @see #removeCallbacks 10812 */ 10813 public boolean post(Runnable action) { 10814 final AttachInfo attachInfo = mAttachInfo; 10815 if (attachInfo != null) { 10816 return attachInfo.mHandler.post(action); 10817 } 10818 // Assume that post will succeed later 10819 ViewRootImpl.getRunQueue().post(action); 10820 return true; 10821 } 10822 10823 /** 10824 * <p>Causes the Runnable to be added to the message queue, to be run 10825 * after the specified amount of time elapses. 10826 * The runnable will be run on the user interface thread.</p> 10827 * 10828 * @param action The Runnable that will be executed. 10829 * @param delayMillis The delay (in milliseconds) until the Runnable 10830 * will be executed. 10831 * 10832 * @return true if the Runnable was successfully placed in to the 10833 * message queue. Returns false on failure, usually because the 10834 * looper processing the message queue is exiting. Note that a 10835 * result of true does not mean the Runnable will be processed -- 10836 * if the looper is quit before the delivery time of the message 10837 * occurs then the message will be dropped. 10838 * 10839 * @see #post 10840 * @see #removeCallbacks 10841 */ 10842 public boolean postDelayed(Runnable action, long delayMillis) { 10843 final AttachInfo attachInfo = mAttachInfo; 10844 if (attachInfo != null) { 10845 return attachInfo.mHandler.postDelayed(action, delayMillis); 10846 } 10847 // Assume that post will succeed later 10848 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10849 return true; 10850 } 10851 10852 /** 10853 * <p>Causes the Runnable to execute on the next animation time step. 10854 * The runnable will be run on the user interface thread.</p> 10855 * 10856 * @param action The Runnable that will be executed. 10857 * 10858 * @see #postOnAnimationDelayed 10859 * @see #removeCallbacks 10860 */ 10861 public void postOnAnimation(Runnable action) { 10862 final AttachInfo attachInfo = mAttachInfo; 10863 if (attachInfo != null) { 10864 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10865 Choreographer.CALLBACK_ANIMATION, action, null); 10866 } else { 10867 // Assume that post will succeed later 10868 ViewRootImpl.getRunQueue().post(action); 10869 } 10870 } 10871 10872 /** 10873 * <p>Causes the Runnable to execute on the next animation time step, 10874 * after the specified amount of time elapses. 10875 * The runnable will be run on the user interface thread.</p> 10876 * 10877 * @param action The Runnable that will be executed. 10878 * @param delayMillis The delay (in milliseconds) until the Runnable 10879 * will be executed. 10880 * 10881 * @see #postOnAnimation 10882 * @see #removeCallbacks 10883 */ 10884 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10885 final AttachInfo attachInfo = mAttachInfo; 10886 if (attachInfo != null) { 10887 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10888 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10889 } else { 10890 // Assume that post will succeed later 10891 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10892 } 10893 } 10894 10895 /** 10896 * <p>Removes the specified Runnable from the message queue.</p> 10897 * 10898 * @param action The Runnable to remove from the message handling queue 10899 * 10900 * @return true if this view could ask the Handler to remove the Runnable, 10901 * false otherwise. When the returned value is true, the Runnable 10902 * may or may not have been actually removed from the message queue 10903 * (for instance, if the Runnable was not in the queue already.) 10904 * 10905 * @see #post 10906 * @see #postDelayed 10907 * @see #postOnAnimation 10908 * @see #postOnAnimationDelayed 10909 */ 10910 public boolean removeCallbacks(Runnable action) { 10911 if (action != null) { 10912 final AttachInfo attachInfo = mAttachInfo; 10913 if (attachInfo != null) { 10914 attachInfo.mHandler.removeCallbacks(action); 10915 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10916 Choreographer.CALLBACK_ANIMATION, action, null); 10917 } else { 10918 // Assume that post will succeed later 10919 ViewRootImpl.getRunQueue().removeCallbacks(action); 10920 } 10921 } 10922 return true; 10923 } 10924 10925 /** 10926 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10927 * Use this to invalidate the View from a non-UI thread.</p> 10928 * 10929 * <p>This method can be invoked from outside of the UI thread 10930 * only when this View is attached to a window.</p> 10931 * 10932 * @see #invalidate() 10933 * @see #postInvalidateDelayed(long) 10934 */ 10935 public void postInvalidate() { 10936 postInvalidateDelayed(0); 10937 } 10938 10939 /** 10940 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10941 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10942 * 10943 * <p>This method can be invoked from outside of the UI thread 10944 * only when this View is attached to a window.</p> 10945 * 10946 * @param left The left coordinate of the rectangle to invalidate. 10947 * @param top The top coordinate of the rectangle to invalidate. 10948 * @param right The right coordinate of the rectangle to invalidate. 10949 * @param bottom The bottom coordinate of the rectangle to invalidate. 10950 * 10951 * @see #invalidate(int, int, int, int) 10952 * @see #invalidate(Rect) 10953 * @see #postInvalidateDelayed(long, int, int, int, int) 10954 */ 10955 public void postInvalidate(int left, int top, int right, int bottom) { 10956 postInvalidateDelayed(0, left, top, right, bottom); 10957 } 10958 10959 /** 10960 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10961 * loop. Waits for the specified amount of time.</p> 10962 * 10963 * <p>This method can be invoked from outside of the UI thread 10964 * only when this View is attached to a window.</p> 10965 * 10966 * @param delayMilliseconds the duration in milliseconds to delay the 10967 * invalidation by 10968 * 10969 * @see #invalidate() 10970 * @see #postInvalidate() 10971 */ 10972 public void postInvalidateDelayed(long delayMilliseconds) { 10973 // We try only with the AttachInfo because there's no point in invalidating 10974 // if we are not attached to our window 10975 final AttachInfo attachInfo = mAttachInfo; 10976 if (attachInfo != null) { 10977 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10978 } 10979 } 10980 10981 /** 10982 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10983 * through the event loop. Waits for the specified amount of time.</p> 10984 * 10985 * <p>This method can be invoked from outside of the UI thread 10986 * only when this View is attached to a window.</p> 10987 * 10988 * @param delayMilliseconds the duration in milliseconds to delay the 10989 * invalidation by 10990 * @param left The left coordinate of the rectangle to invalidate. 10991 * @param top The top coordinate of the rectangle to invalidate. 10992 * @param right The right coordinate of the rectangle to invalidate. 10993 * @param bottom The bottom coordinate of the rectangle to invalidate. 10994 * 10995 * @see #invalidate(int, int, int, int) 10996 * @see #invalidate(Rect) 10997 * @see #postInvalidate(int, int, int, int) 10998 */ 10999 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 11000 int right, int bottom) { 11001 11002 // We try only with the AttachInfo because there's no point in invalidating 11003 // if we are not attached to our window 11004 final AttachInfo attachInfo = mAttachInfo; 11005 if (attachInfo != null) { 11006 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11007 info.target = this; 11008 info.left = left; 11009 info.top = top; 11010 info.right = right; 11011 info.bottom = bottom; 11012 11013 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 11014 } 11015 } 11016 11017 /** 11018 * <p>Cause an invalidate to happen on the next animation time step, typically the 11019 * next display frame.</p> 11020 * 11021 * <p>This method can be invoked from outside of the UI thread 11022 * only when this View is attached to a window.</p> 11023 * 11024 * @see #invalidate() 11025 */ 11026 public void postInvalidateOnAnimation() { 11027 // We try only with the AttachInfo because there's no point in invalidating 11028 // if we are not attached to our window 11029 final AttachInfo attachInfo = mAttachInfo; 11030 if (attachInfo != null) { 11031 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 11032 } 11033 } 11034 11035 /** 11036 * <p>Cause an invalidate of the specified area to happen on the next animation 11037 * time step, typically the next display frame.</p> 11038 * 11039 * <p>This method can be invoked from outside of the UI thread 11040 * only when this View is attached to a window.</p> 11041 * 11042 * @param left The left coordinate of the rectangle to invalidate. 11043 * @param top The top coordinate of the rectangle to invalidate. 11044 * @param right The right coordinate of the rectangle to invalidate. 11045 * @param bottom The bottom coordinate of the rectangle to invalidate. 11046 * 11047 * @see #invalidate(int, int, int, int) 11048 * @see #invalidate(Rect) 11049 */ 11050 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 11051 // We try only with the AttachInfo because there's no point in invalidating 11052 // if we are not attached to our window 11053 final AttachInfo attachInfo = mAttachInfo; 11054 if (attachInfo != null) { 11055 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 11056 info.target = this; 11057 info.left = left; 11058 info.top = top; 11059 info.right = right; 11060 info.bottom = bottom; 11061 11062 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 11063 } 11064 } 11065 11066 /** 11067 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 11068 * This event is sent at most once every 11069 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 11070 */ 11071 private void postSendViewScrolledAccessibilityEventCallback() { 11072 if (mSendViewScrolledAccessibilityEvent == null) { 11073 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 11074 } 11075 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 11076 mSendViewScrolledAccessibilityEvent.mIsPending = true; 11077 postDelayed(mSendViewScrolledAccessibilityEvent, 11078 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 11079 } 11080 } 11081 11082 /** 11083 * Called by a parent to request that a child update its values for mScrollX 11084 * and mScrollY if necessary. This will typically be done if the child is 11085 * animating a scroll using a {@link android.widget.Scroller Scroller} 11086 * object. 11087 */ 11088 public void computeScroll() { 11089 } 11090 11091 /** 11092 * <p>Indicate whether the horizontal edges are faded when the view is 11093 * scrolled horizontally.</p> 11094 * 11095 * @return true if the horizontal edges should are faded on scroll, false 11096 * otherwise 11097 * 11098 * @see #setHorizontalFadingEdgeEnabled(boolean) 11099 * 11100 * @attr ref android.R.styleable#View_requiresFadingEdge 11101 */ 11102 public boolean isHorizontalFadingEdgeEnabled() { 11103 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 11104 } 11105 11106 /** 11107 * <p>Define whether the horizontal edges should be faded when this view 11108 * is scrolled horizontally.</p> 11109 * 11110 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 11111 * be faded when the view is scrolled 11112 * horizontally 11113 * 11114 * @see #isHorizontalFadingEdgeEnabled() 11115 * 11116 * @attr ref android.R.styleable#View_requiresFadingEdge 11117 */ 11118 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 11119 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 11120 if (horizontalFadingEdgeEnabled) { 11121 initScrollCache(); 11122 } 11123 11124 mViewFlags ^= FADING_EDGE_HORIZONTAL; 11125 } 11126 } 11127 11128 /** 11129 * <p>Indicate whether the vertical edges are faded when the view is 11130 * scrolled horizontally.</p> 11131 * 11132 * @return true if the vertical edges should are faded on scroll, false 11133 * otherwise 11134 * 11135 * @see #setVerticalFadingEdgeEnabled(boolean) 11136 * 11137 * @attr ref android.R.styleable#View_requiresFadingEdge 11138 */ 11139 public boolean isVerticalFadingEdgeEnabled() { 11140 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 11141 } 11142 11143 /** 11144 * <p>Define whether the vertical edges should be faded when this view 11145 * is scrolled vertically.</p> 11146 * 11147 * @param verticalFadingEdgeEnabled true if the vertical edges should 11148 * be faded when the view is scrolled 11149 * vertically 11150 * 11151 * @see #isVerticalFadingEdgeEnabled() 11152 * 11153 * @attr ref android.R.styleable#View_requiresFadingEdge 11154 */ 11155 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 11156 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 11157 if (verticalFadingEdgeEnabled) { 11158 initScrollCache(); 11159 } 11160 11161 mViewFlags ^= FADING_EDGE_VERTICAL; 11162 } 11163 } 11164 11165 /** 11166 * Returns the strength, or intensity, of the top faded edge. The strength is 11167 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11168 * returns 0.0 or 1.0 but no value in between. 11169 * 11170 * Subclasses should override this method to provide a smoother fade transition 11171 * when scrolling occurs. 11172 * 11173 * @return the intensity of the top fade as a float between 0.0f and 1.0f 11174 */ 11175 protected float getTopFadingEdgeStrength() { 11176 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 11177 } 11178 11179 /** 11180 * Returns the strength, or intensity, of the bottom faded edge. The strength is 11181 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11182 * returns 0.0 or 1.0 but no value in between. 11183 * 11184 * Subclasses should override this method to provide a smoother fade transition 11185 * when scrolling occurs. 11186 * 11187 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 11188 */ 11189 protected float getBottomFadingEdgeStrength() { 11190 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 11191 computeVerticalScrollRange() ? 1.0f : 0.0f; 11192 } 11193 11194 /** 11195 * Returns the strength, or intensity, of the left faded edge. The strength is 11196 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11197 * returns 0.0 or 1.0 but no value in between. 11198 * 11199 * Subclasses should override this method to provide a smoother fade transition 11200 * when scrolling occurs. 11201 * 11202 * @return the intensity of the left fade as a float between 0.0f and 1.0f 11203 */ 11204 protected float getLeftFadingEdgeStrength() { 11205 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 11206 } 11207 11208 /** 11209 * Returns the strength, or intensity, of the right faded edge. The strength is 11210 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11211 * returns 0.0 or 1.0 but no value in between. 11212 * 11213 * Subclasses should override this method to provide a smoother fade transition 11214 * when scrolling occurs. 11215 * 11216 * @return the intensity of the right fade as a float between 0.0f and 1.0f 11217 */ 11218 protected float getRightFadingEdgeStrength() { 11219 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 11220 computeHorizontalScrollRange() ? 1.0f : 0.0f; 11221 } 11222 11223 /** 11224 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 11225 * scrollbar is not drawn by default.</p> 11226 * 11227 * @return true if the horizontal scrollbar should be painted, false 11228 * otherwise 11229 * 11230 * @see #setHorizontalScrollBarEnabled(boolean) 11231 */ 11232 public boolean isHorizontalScrollBarEnabled() { 11233 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11234 } 11235 11236 /** 11237 * <p>Define whether the horizontal scrollbar should be drawn or not. The 11238 * scrollbar is not drawn by default.</p> 11239 * 11240 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 11241 * be painted 11242 * 11243 * @see #isHorizontalScrollBarEnabled() 11244 */ 11245 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 11246 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 11247 mViewFlags ^= SCROLLBARS_HORIZONTAL; 11248 computeOpaqueFlags(); 11249 resolvePadding(); 11250 } 11251 } 11252 11253 /** 11254 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 11255 * scrollbar is not drawn by default.</p> 11256 * 11257 * @return true if the vertical scrollbar should be painted, false 11258 * otherwise 11259 * 11260 * @see #setVerticalScrollBarEnabled(boolean) 11261 */ 11262 public boolean isVerticalScrollBarEnabled() { 11263 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 11264 } 11265 11266 /** 11267 * <p>Define whether the vertical scrollbar should be drawn or not. The 11268 * scrollbar is not drawn by default.</p> 11269 * 11270 * @param verticalScrollBarEnabled true if the vertical scrollbar should 11271 * be painted 11272 * 11273 * @see #isVerticalScrollBarEnabled() 11274 */ 11275 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 11276 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 11277 mViewFlags ^= SCROLLBARS_VERTICAL; 11278 computeOpaqueFlags(); 11279 resolvePadding(); 11280 } 11281 } 11282 11283 /** 11284 * @hide 11285 */ 11286 protected void recomputePadding() { 11287 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11288 } 11289 11290 /** 11291 * Define whether scrollbars will fade when the view is not scrolling. 11292 * 11293 * @param fadeScrollbars wheter to enable fading 11294 * 11295 * @attr ref android.R.styleable#View_fadeScrollbars 11296 */ 11297 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11298 initScrollCache(); 11299 final ScrollabilityCache scrollabilityCache = mScrollCache; 11300 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11301 if (fadeScrollbars) { 11302 scrollabilityCache.state = ScrollabilityCache.OFF; 11303 } else { 11304 scrollabilityCache.state = ScrollabilityCache.ON; 11305 } 11306 } 11307 11308 /** 11309 * 11310 * Returns true if scrollbars will fade when this view is not scrolling 11311 * 11312 * @return true if scrollbar fading is enabled 11313 * 11314 * @attr ref android.R.styleable#View_fadeScrollbars 11315 */ 11316 public boolean isScrollbarFadingEnabled() { 11317 return mScrollCache != null && mScrollCache.fadeScrollBars; 11318 } 11319 11320 /** 11321 * 11322 * Returns the delay before scrollbars fade. 11323 * 11324 * @return the delay before scrollbars fade 11325 * 11326 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11327 */ 11328 public int getScrollBarDefaultDelayBeforeFade() { 11329 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11330 mScrollCache.scrollBarDefaultDelayBeforeFade; 11331 } 11332 11333 /** 11334 * Define the delay before scrollbars fade. 11335 * 11336 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11337 * 11338 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11339 */ 11340 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11341 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11342 } 11343 11344 /** 11345 * 11346 * Returns the scrollbar fade duration. 11347 * 11348 * @return the scrollbar fade duration 11349 * 11350 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11351 */ 11352 public int getScrollBarFadeDuration() { 11353 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11354 mScrollCache.scrollBarFadeDuration; 11355 } 11356 11357 /** 11358 * Define the scrollbar fade duration. 11359 * 11360 * @param scrollBarFadeDuration - the scrollbar fade duration 11361 * 11362 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11363 */ 11364 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11365 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11366 } 11367 11368 /** 11369 * 11370 * Returns the scrollbar size. 11371 * 11372 * @return the scrollbar size 11373 * 11374 * @attr ref android.R.styleable#View_scrollbarSize 11375 */ 11376 public int getScrollBarSize() { 11377 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11378 mScrollCache.scrollBarSize; 11379 } 11380 11381 /** 11382 * Define the scrollbar size. 11383 * 11384 * @param scrollBarSize - the scrollbar size 11385 * 11386 * @attr ref android.R.styleable#View_scrollbarSize 11387 */ 11388 public void setScrollBarSize(int scrollBarSize) { 11389 getScrollCache().scrollBarSize = scrollBarSize; 11390 } 11391 11392 /** 11393 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11394 * inset. When inset, they add to the padding of the view. And the scrollbars 11395 * can be drawn inside the padding area or on the edge of the view. For example, 11396 * if a view has a background drawable and you want to draw the scrollbars 11397 * inside the padding specified by the drawable, you can use 11398 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11399 * appear at the edge of the view, ignoring the padding, then you can use 11400 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11401 * @param style the style of the scrollbars. Should be one of 11402 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11403 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11404 * @see #SCROLLBARS_INSIDE_OVERLAY 11405 * @see #SCROLLBARS_INSIDE_INSET 11406 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11407 * @see #SCROLLBARS_OUTSIDE_INSET 11408 * 11409 * @attr ref android.R.styleable#View_scrollbarStyle 11410 */ 11411 public void setScrollBarStyle(int style) { 11412 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11413 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11414 computeOpaqueFlags(); 11415 resolvePadding(); 11416 } 11417 } 11418 11419 /** 11420 * <p>Returns the current scrollbar style.</p> 11421 * @return the current scrollbar style 11422 * @see #SCROLLBARS_INSIDE_OVERLAY 11423 * @see #SCROLLBARS_INSIDE_INSET 11424 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11425 * @see #SCROLLBARS_OUTSIDE_INSET 11426 * 11427 * @attr ref android.R.styleable#View_scrollbarStyle 11428 */ 11429 @ViewDebug.ExportedProperty(mapping = { 11430 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11431 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11432 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11433 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11434 }) 11435 public int getScrollBarStyle() { 11436 return mViewFlags & SCROLLBARS_STYLE_MASK; 11437 } 11438 11439 /** 11440 * <p>Compute the horizontal range that the horizontal scrollbar 11441 * represents.</p> 11442 * 11443 * <p>The range is expressed in arbitrary units that must be the same as the 11444 * units used by {@link #computeHorizontalScrollExtent()} and 11445 * {@link #computeHorizontalScrollOffset()}.</p> 11446 * 11447 * <p>The default range is the drawing width of this view.</p> 11448 * 11449 * @return the total horizontal range represented by the horizontal 11450 * scrollbar 11451 * 11452 * @see #computeHorizontalScrollExtent() 11453 * @see #computeHorizontalScrollOffset() 11454 * @see android.widget.ScrollBarDrawable 11455 */ 11456 protected int computeHorizontalScrollRange() { 11457 return getWidth(); 11458 } 11459 11460 /** 11461 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11462 * within the horizontal range. This value is used to compute the position 11463 * of the thumb within the scrollbar's track.</p> 11464 * 11465 * <p>The range is expressed in arbitrary units that must be the same as the 11466 * units used by {@link #computeHorizontalScrollRange()} and 11467 * {@link #computeHorizontalScrollExtent()}.</p> 11468 * 11469 * <p>The default offset is the scroll offset of this view.</p> 11470 * 11471 * @return the horizontal offset of the scrollbar's thumb 11472 * 11473 * @see #computeHorizontalScrollRange() 11474 * @see #computeHorizontalScrollExtent() 11475 * @see android.widget.ScrollBarDrawable 11476 */ 11477 protected int computeHorizontalScrollOffset() { 11478 return mScrollX; 11479 } 11480 11481 /** 11482 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11483 * within the horizontal range. This value is used to compute the length 11484 * of the thumb within the scrollbar's track.</p> 11485 * 11486 * <p>The range is expressed in arbitrary units that must be the same as the 11487 * units used by {@link #computeHorizontalScrollRange()} and 11488 * {@link #computeHorizontalScrollOffset()}.</p> 11489 * 11490 * <p>The default extent is the drawing width of this view.</p> 11491 * 11492 * @return the horizontal extent of the scrollbar's thumb 11493 * 11494 * @see #computeHorizontalScrollRange() 11495 * @see #computeHorizontalScrollOffset() 11496 * @see android.widget.ScrollBarDrawable 11497 */ 11498 protected int computeHorizontalScrollExtent() { 11499 return getWidth(); 11500 } 11501 11502 /** 11503 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11504 * 11505 * <p>The range is expressed in arbitrary units that must be the same as the 11506 * units used by {@link #computeVerticalScrollExtent()} and 11507 * {@link #computeVerticalScrollOffset()}.</p> 11508 * 11509 * @return the total vertical range represented by the vertical scrollbar 11510 * 11511 * <p>The default range is the drawing height of this view.</p> 11512 * 11513 * @see #computeVerticalScrollExtent() 11514 * @see #computeVerticalScrollOffset() 11515 * @see android.widget.ScrollBarDrawable 11516 */ 11517 protected int computeVerticalScrollRange() { 11518 return getHeight(); 11519 } 11520 11521 /** 11522 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11523 * within the horizontal range. This value is used to compute the position 11524 * of the thumb within the scrollbar's track.</p> 11525 * 11526 * <p>The range is expressed in arbitrary units that must be the same as the 11527 * units used by {@link #computeVerticalScrollRange()} and 11528 * {@link #computeVerticalScrollExtent()}.</p> 11529 * 11530 * <p>The default offset is the scroll offset of this view.</p> 11531 * 11532 * @return the vertical offset of the scrollbar's thumb 11533 * 11534 * @see #computeVerticalScrollRange() 11535 * @see #computeVerticalScrollExtent() 11536 * @see android.widget.ScrollBarDrawable 11537 */ 11538 protected int computeVerticalScrollOffset() { 11539 return mScrollY; 11540 } 11541 11542 /** 11543 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11544 * within the vertical range. This value is used to compute the length 11545 * of the thumb within the scrollbar's track.</p> 11546 * 11547 * <p>The range is expressed in arbitrary units that must be the same as the 11548 * units used by {@link #computeVerticalScrollRange()} and 11549 * {@link #computeVerticalScrollOffset()}.</p> 11550 * 11551 * <p>The default extent is the drawing height of this view.</p> 11552 * 11553 * @return the vertical extent of the scrollbar's thumb 11554 * 11555 * @see #computeVerticalScrollRange() 11556 * @see #computeVerticalScrollOffset() 11557 * @see android.widget.ScrollBarDrawable 11558 */ 11559 protected int computeVerticalScrollExtent() { 11560 return getHeight(); 11561 } 11562 11563 /** 11564 * Check if this view can be scrolled horizontally in a certain direction. 11565 * 11566 * @param direction Negative to check scrolling left, positive to check scrolling right. 11567 * @return true if this view can be scrolled in the specified direction, false otherwise. 11568 */ 11569 public boolean canScrollHorizontally(int direction) { 11570 final int offset = computeHorizontalScrollOffset(); 11571 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11572 if (range == 0) return false; 11573 if (direction < 0) { 11574 return offset > 0; 11575 } else { 11576 return offset < range - 1; 11577 } 11578 } 11579 11580 /** 11581 * Check if this view can be scrolled vertically in a certain direction. 11582 * 11583 * @param direction Negative to check scrolling up, positive to check scrolling down. 11584 * @return true if this view can be scrolled in the specified direction, false otherwise. 11585 */ 11586 public boolean canScrollVertically(int direction) { 11587 final int offset = computeVerticalScrollOffset(); 11588 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11589 if (range == 0) return false; 11590 if (direction < 0) { 11591 return offset > 0; 11592 } else { 11593 return offset < range - 1; 11594 } 11595 } 11596 11597 /** 11598 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11599 * scrollbars are painted only if they have been awakened first.</p> 11600 * 11601 * @param canvas the canvas on which to draw the scrollbars 11602 * 11603 * @see #awakenScrollBars(int) 11604 */ 11605 protected final void onDrawScrollBars(Canvas canvas) { 11606 // scrollbars are drawn only when the animation is running 11607 final ScrollabilityCache cache = mScrollCache; 11608 if (cache != null) { 11609 11610 int state = cache.state; 11611 11612 if (state == ScrollabilityCache.OFF) { 11613 return; 11614 } 11615 11616 boolean invalidate = false; 11617 11618 if (state == ScrollabilityCache.FADING) { 11619 // We're fading -- get our fade interpolation 11620 if (cache.interpolatorValues == null) { 11621 cache.interpolatorValues = new float[1]; 11622 } 11623 11624 float[] values = cache.interpolatorValues; 11625 11626 // Stops the animation if we're done 11627 if (cache.scrollBarInterpolator.timeToValues(values) == 11628 Interpolator.Result.FREEZE_END) { 11629 cache.state = ScrollabilityCache.OFF; 11630 } else { 11631 cache.scrollBar.setAlpha(Math.round(values[0])); 11632 } 11633 11634 // This will make the scroll bars inval themselves after 11635 // drawing. We only want this when we're fading so that 11636 // we prevent excessive redraws 11637 invalidate = true; 11638 } else { 11639 // We're just on -- but we may have been fading before so 11640 // reset alpha 11641 cache.scrollBar.setAlpha(255); 11642 } 11643 11644 11645 final int viewFlags = mViewFlags; 11646 11647 final boolean drawHorizontalScrollBar = 11648 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11649 final boolean drawVerticalScrollBar = 11650 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11651 && !isVerticalScrollBarHidden(); 11652 11653 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11654 final int width = mRight - mLeft; 11655 final int height = mBottom - mTop; 11656 11657 final ScrollBarDrawable scrollBar = cache.scrollBar; 11658 11659 final int scrollX = mScrollX; 11660 final int scrollY = mScrollY; 11661 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11662 11663 int left; 11664 int top; 11665 int right; 11666 int bottom; 11667 11668 if (drawHorizontalScrollBar) { 11669 int size = scrollBar.getSize(false); 11670 if (size <= 0) { 11671 size = cache.scrollBarSize; 11672 } 11673 11674 scrollBar.setParameters(computeHorizontalScrollRange(), 11675 computeHorizontalScrollOffset(), 11676 computeHorizontalScrollExtent(), false); 11677 final int verticalScrollBarGap = drawVerticalScrollBar ? 11678 getVerticalScrollbarWidth() : 0; 11679 top = scrollY + height - size - (mUserPaddingBottom & inside); 11680 left = scrollX + (mPaddingLeft & inside); 11681 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11682 bottom = top + size; 11683 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11684 if (invalidate) { 11685 invalidate(left, top, right, bottom); 11686 } 11687 } 11688 11689 if (drawVerticalScrollBar) { 11690 int size = scrollBar.getSize(true); 11691 if (size <= 0) { 11692 size = cache.scrollBarSize; 11693 } 11694 11695 scrollBar.setParameters(computeVerticalScrollRange(), 11696 computeVerticalScrollOffset(), 11697 computeVerticalScrollExtent(), true); 11698 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11699 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11700 verticalScrollbarPosition = isLayoutRtl() ? 11701 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11702 } 11703 switch (verticalScrollbarPosition) { 11704 default: 11705 case SCROLLBAR_POSITION_RIGHT: 11706 left = scrollX + width - size - (mUserPaddingRight & inside); 11707 break; 11708 case SCROLLBAR_POSITION_LEFT: 11709 left = scrollX + (mUserPaddingLeft & inside); 11710 break; 11711 } 11712 top = scrollY + (mPaddingTop & inside); 11713 right = left + size; 11714 bottom = scrollY + height - (mUserPaddingBottom & inside); 11715 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11716 if (invalidate) { 11717 invalidate(left, top, right, bottom); 11718 } 11719 } 11720 } 11721 } 11722 } 11723 11724 /** 11725 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11726 * FastScroller is visible. 11727 * @return whether to temporarily hide the vertical scrollbar 11728 * @hide 11729 */ 11730 protected boolean isVerticalScrollBarHidden() { 11731 return false; 11732 } 11733 11734 /** 11735 * <p>Draw the horizontal scrollbar if 11736 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11737 * 11738 * @param canvas the canvas on which to draw the scrollbar 11739 * @param scrollBar the scrollbar's drawable 11740 * 11741 * @see #isHorizontalScrollBarEnabled() 11742 * @see #computeHorizontalScrollRange() 11743 * @see #computeHorizontalScrollExtent() 11744 * @see #computeHorizontalScrollOffset() 11745 * @see android.widget.ScrollBarDrawable 11746 * @hide 11747 */ 11748 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11749 int l, int t, int r, int b) { 11750 scrollBar.setBounds(l, t, r, b); 11751 scrollBar.draw(canvas); 11752 } 11753 11754 /** 11755 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11756 * returns true.</p> 11757 * 11758 * @param canvas the canvas on which to draw the scrollbar 11759 * @param scrollBar the scrollbar's drawable 11760 * 11761 * @see #isVerticalScrollBarEnabled() 11762 * @see #computeVerticalScrollRange() 11763 * @see #computeVerticalScrollExtent() 11764 * @see #computeVerticalScrollOffset() 11765 * @see android.widget.ScrollBarDrawable 11766 * @hide 11767 */ 11768 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11769 int l, int t, int r, int b) { 11770 scrollBar.setBounds(l, t, r, b); 11771 scrollBar.draw(canvas); 11772 } 11773 11774 /** 11775 * Implement this to do your drawing. 11776 * 11777 * @param canvas the canvas on which the background will be drawn 11778 */ 11779 protected void onDraw(Canvas canvas) { 11780 } 11781 11782 /* 11783 * Caller is responsible for calling requestLayout if necessary. 11784 * (This allows addViewInLayout to not request a new layout.) 11785 */ 11786 void assignParent(ViewParent parent) { 11787 if (mParent == null) { 11788 mParent = parent; 11789 } else if (parent == null) { 11790 mParent = null; 11791 } else { 11792 throw new RuntimeException("view " + this + " being added, but" 11793 + " it already has a parent"); 11794 } 11795 } 11796 11797 /** 11798 * This is called when the view is attached to a window. At this point it 11799 * has a Surface and will start drawing. Note that this function is 11800 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11801 * however it may be called any time before the first onDraw -- including 11802 * before or after {@link #onMeasure(int, int)}. 11803 * 11804 * @see #onDetachedFromWindow() 11805 */ 11806 protected void onAttachedToWindow() { 11807 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 11808 mParent.requestTransparentRegion(this); 11809 } 11810 11811 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11812 initialAwakenScrollBars(); 11813 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 11814 } 11815 11816 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 11817 11818 jumpDrawablesToCurrentState(); 11819 11820 clearAccessibilityFocus(); 11821 resetSubtreeAccessibilityStateChanged(); 11822 11823 if (isFocused()) { 11824 InputMethodManager imm = InputMethodManager.peekInstance(); 11825 imm.focusIn(this); 11826 } 11827 11828 if (mDisplayList != null) { 11829 mDisplayList.clearDirty(); 11830 } 11831 } 11832 11833 /** 11834 * Resolve all RTL related properties. 11835 * 11836 * @return true if resolution of RTL properties has been done 11837 * 11838 * @hide 11839 */ 11840 public boolean resolveRtlPropertiesIfNeeded() { 11841 if (!needRtlPropertiesResolution()) return false; 11842 11843 // Order is important here: LayoutDirection MUST be resolved first 11844 if (!isLayoutDirectionResolved()) { 11845 resolveLayoutDirection(); 11846 resolveLayoutParams(); 11847 } 11848 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 11849 if (!isTextDirectionResolved()) { 11850 resolveTextDirection(); 11851 } 11852 if (!isTextAlignmentResolved()) { 11853 resolveTextAlignment(); 11854 } 11855 if (!isPaddingResolved()) { 11856 resolvePadding(); 11857 } 11858 if (!isDrawablesResolved()) { 11859 resolveDrawables(); 11860 } 11861 onRtlPropertiesChanged(getLayoutDirection()); 11862 return true; 11863 } 11864 11865 /** 11866 * Reset resolution of all RTL related properties. 11867 * 11868 * @hide 11869 */ 11870 public void resetRtlProperties() { 11871 resetResolvedLayoutDirection(); 11872 resetResolvedTextDirection(); 11873 resetResolvedTextAlignment(); 11874 resetResolvedPadding(); 11875 resetResolvedDrawables(); 11876 } 11877 11878 /** 11879 * @see #onScreenStateChanged(int) 11880 */ 11881 void dispatchScreenStateChanged(int screenState) { 11882 onScreenStateChanged(screenState); 11883 } 11884 11885 /** 11886 * This method is called whenever the state of the screen this view is 11887 * attached to changes. A state change will usually occurs when the screen 11888 * turns on or off (whether it happens automatically or the user does it 11889 * manually.) 11890 * 11891 * @param screenState The new state of the screen. Can be either 11892 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11893 */ 11894 public void onScreenStateChanged(int screenState) { 11895 } 11896 11897 /** 11898 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11899 */ 11900 private boolean hasRtlSupport() { 11901 return mContext.getApplicationInfo().hasRtlSupport(); 11902 } 11903 11904 /** 11905 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 11906 * RTL not supported) 11907 */ 11908 private boolean isRtlCompatibilityMode() { 11909 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 11910 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 11911 } 11912 11913 /** 11914 * @return true if RTL properties need resolution. 11915 * 11916 */ 11917 private boolean needRtlPropertiesResolution() { 11918 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 11919 } 11920 11921 /** 11922 * Called when any RTL property (layout direction or text direction or text alignment) has 11923 * been changed. 11924 * 11925 * Subclasses need to override this method to take care of cached information that depends on the 11926 * resolved layout direction, or to inform child views that inherit their layout direction. 11927 * 11928 * The default implementation does nothing. 11929 * 11930 * @param layoutDirection the direction of the layout 11931 * 11932 * @see #LAYOUT_DIRECTION_LTR 11933 * @see #LAYOUT_DIRECTION_RTL 11934 */ 11935 public void onRtlPropertiesChanged(int layoutDirection) { 11936 } 11937 11938 /** 11939 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11940 * that the parent directionality can and will be resolved before its children. 11941 * 11942 * @return true if resolution has been done, false otherwise. 11943 * 11944 * @hide 11945 */ 11946 public boolean resolveLayoutDirection() { 11947 // Clear any previous layout direction resolution 11948 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11949 11950 if (hasRtlSupport()) { 11951 // Set resolved depending on layout direction 11952 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 11953 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 11954 case LAYOUT_DIRECTION_INHERIT: 11955 // We cannot resolve yet. LTR is by default and let the resolution happen again 11956 // later to get the correct resolved value 11957 if (!canResolveLayoutDirection()) return false; 11958 11959 // Parent has not yet resolved, LTR is still the default 11960 try { 11961 if (!mParent.isLayoutDirectionResolved()) return false; 11962 11963 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11964 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11965 } 11966 } catch (AbstractMethodError e) { 11967 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 11968 " does not fully implement ViewParent", e); 11969 } 11970 break; 11971 case LAYOUT_DIRECTION_RTL: 11972 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11973 break; 11974 case LAYOUT_DIRECTION_LOCALE: 11975 if((LAYOUT_DIRECTION_RTL == 11976 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 11977 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11978 } 11979 break; 11980 default: 11981 // Nothing to do, LTR by default 11982 } 11983 } 11984 11985 // Set to resolved 11986 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11987 return true; 11988 } 11989 11990 /** 11991 * Check if layout direction resolution can be done. 11992 * 11993 * @return true if layout direction resolution can be done otherwise return false. 11994 */ 11995 public boolean canResolveLayoutDirection() { 11996 switch (getRawLayoutDirection()) { 11997 case LAYOUT_DIRECTION_INHERIT: 11998 if (mParent != null) { 11999 try { 12000 return mParent.canResolveLayoutDirection(); 12001 } catch (AbstractMethodError e) { 12002 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 12003 " does not fully implement ViewParent", e); 12004 } 12005 } 12006 return false; 12007 12008 default: 12009 return true; 12010 } 12011 } 12012 12013 /** 12014 * Reset the resolved layout direction. Layout direction will be resolved during a call to 12015 * {@link #onMeasure(int, int)}. 12016 * 12017 * @hide 12018 */ 12019 public void resetResolvedLayoutDirection() { 12020 // Reset the current resolved bits 12021 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 12022 } 12023 12024 /** 12025 * @return true if the layout direction is inherited. 12026 * 12027 * @hide 12028 */ 12029 public boolean isLayoutDirectionInherited() { 12030 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 12031 } 12032 12033 /** 12034 * @return true if layout direction has been resolved. 12035 */ 12036 public boolean isLayoutDirectionResolved() { 12037 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 12038 } 12039 12040 /** 12041 * Return if padding has been resolved 12042 * 12043 * @hide 12044 */ 12045 boolean isPaddingResolved() { 12046 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 12047 } 12048 12049 /** 12050 * Resolve padding depending on layout direction. 12051 * 12052 * @hide 12053 */ 12054 public void resolvePadding() { 12055 if (!isRtlCompatibilityMode()) { 12056 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 12057 // If start / end padding are defined, they will be resolved (hence overriding) to 12058 // left / right or right / left depending on the resolved layout direction. 12059 // If start / end padding are not defined, use the left / right ones. 12060 int resolvedLayoutDirection = getLayoutDirection(); 12061 switch (resolvedLayoutDirection) { 12062 case LAYOUT_DIRECTION_RTL: 12063 if (mUserPaddingStart != UNDEFINED_PADDING) { 12064 mUserPaddingRight = mUserPaddingStart; 12065 } else { 12066 mUserPaddingRight = mUserPaddingRightInitial; 12067 } 12068 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12069 mUserPaddingLeft = mUserPaddingEnd; 12070 } else { 12071 mUserPaddingLeft = mUserPaddingLeftInitial; 12072 } 12073 break; 12074 case LAYOUT_DIRECTION_LTR: 12075 default: 12076 if (mUserPaddingStart != UNDEFINED_PADDING) { 12077 mUserPaddingLeft = mUserPaddingStart; 12078 } else { 12079 mUserPaddingLeft = mUserPaddingLeftInitial; 12080 } 12081 if (mUserPaddingEnd != UNDEFINED_PADDING) { 12082 mUserPaddingRight = mUserPaddingEnd; 12083 } else { 12084 mUserPaddingRight = mUserPaddingRightInitial; 12085 } 12086 } 12087 12088 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 12089 12090 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, 12091 mUserPaddingBottom); 12092 onRtlPropertiesChanged(resolvedLayoutDirection); 12093 } 12094 12095 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 12096 } 12097 12098 /** 12099 * Reset the resolved layout direction. 12100 * 12101 * @hide 12102 */ 12103 public void resetResolvedPadding() { 12104 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 12105 } 12106 12107 /** 12108 * This is called when the view is detached from a window. At this point it 12109 * no longer has a surface for drawing. 12110 * 12111 * @see #onAttachedToWindow() 12112 */ 12113 protected void onDetachedFromWindow() { 12114 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 12115 mPrivateFlags3 &= ~PFLAG3_IS_LAID_OUT; 12116 12117 removeUnsetPressCallback(); 12118 removeLongPressCallback(); 12119 removePerformClickCallback(); 12120 removeSendViewScrolledAccessibilityEventCallback(); 12121 12122 destroyDrawingCache(); 12123 12124 destroyLayer(false); 12125 12126 cleanupDraw(); 12127 12128 mCurrentAnimation = null; 12129 mCurrentScene = null; 12130 } 12131 12132 private void cleanupDraw() { 12133 if (mAttachInfo != null) { 12134 if (mDisplayList != null) { 12135 mDisplayList.markDirty(); 12136 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 12137 } 12138 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 12139 } else { 12140 // Should never happen 12141 clearDisplayList(); 12142 } 12143 } 12144 12145 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 12146 } 12147 12148 /** 12149 * @return The number of times this view has been attached to a window 12150 */ 12151 protected int getWindowAttachCount() { 12152 return mWindowAttachCount; 12153 } 12154 12155 /** 12156 * Retrieve a unique token identifying the window this view is attached to. 12157 * @return Return the window's token for use in 12158 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 12159 */ 12160 public IBinder getWindowToken() { 12161 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 12162 } 12163 12164 /** 12165 * Retrieve the {@link WindowId} for the window this view is 12166 * currently attached to. 12167 */ 12168 public WindowId getWindowId() { 12169 if (mAttachInfo == null) { 12170 return null; 12171 } 12172 if (mAttachInfo.mWindowId == null) { 12173 try { 12174 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 12175 mAttachInfo.mWindowToken); 12176 mAttachInfo.mWindowId = new WindowId( 12177 mAttachInfo.mIWindowId); 12178 } catch (RemoteException e) { 12179 } 12180 } 12181 return mAttachInfo.mWindowId; 12182 } 12183 12184 /** 12185 * Retrieve a unique token identifying the top-level "real" window of 12186 * the window that this view is attached to. That is, this is like 12187 * {@link #getWindowToken}, except if the window this view in is a panel 12188 * window (attached to another containing window), then the token of 12189 * the containing window is returned instead. 12190 * 12191 * @return Returns the associated window token, either 12192 * {@link #getWindowToken()} or the containing window's token. 12193 */ 12194 public IBinder getApplicationWindowToken() { 12195 AttachInfo ai = mAttachInfo; 12196 if (ai != null) { 12197 IBinder appWindowToken = ai.mPanelParentWindowToken; 12198 if (appWindowToken == null) { 12199 appWindowToken = ai.mWindowToken; 12200 } 12201 return appWindowToken; 12202 } 12203 return null; 12204 } 12205 12206 /** 12207 * Gets the logical display to which the view's window has been attached. 12208 * 12209 * @return The logical display, or null if the view is not currently attached to a window. 12210 */ 12211 public Display getDisplay() { 12212 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 12213 } 12214 12215 /** 12216 * Retrieve private session object this view hierarchy is using to 12217 * communicate with the window manager. 12218 * @return the session object to communicate with the window manager 12219 */ 12220 /*package*/ IWindowSession getWindowSession() { 12221 return mAttachInfo != null ? mAttachInfo.mSession : null; 12222 } 12223 12224 /** 12225 * @param info the {@link android.view.View.AttachInfo} to associated with 12226 * this view 12227 */ 12228 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 12229 //System.out.println("Attached! " + this); 12230 mAttachInfo = info; 12231 if (mOverlay != null) { 12232 mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); 12233 } 12234 mWindowAttachCount++; 12235 // We will need to evaluate the drawable state at least once. 12236 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 12237 if (mFloatingTreeObserver != null) { 12238 info.mTreeObserver.merge(mFloatingTreeObserver); 12239 mFloatingTreeObserver = null; 12240 } 12241 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 12242 mAttachInfo.mScrollContainers.add(this); 12243 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 12244 } 12245 performCollectViewAttributes(mAttachInfo, visibility); 12246 onAttachedToWindow(); 12247 12248 ListenerInfo li = mListenerInfo; 12249 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12250 li != null ? li.mOnAttachStateChangeListeners : null; 12251 if (listeners != null && listeners.size() > 0) { 12252 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12253 // perform the dispatching. The iterator is a safe guard against listeners that 12254 // could mutate the list by calling the various add/remove methods. This prevents 12255 // the array from being modified while we iterate it. 12256 for (OnAttachStateChangeListener listener : listeners) { 12257 listener.onViewAttachedToWindow(this); 12258 } 12259 } 12260 12261 int vis = info.mWindowVisibility; 12262 if (vis != GONE) { 12263 onWindowVisibilityChanged(vis); 12264 } 12265 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 12266 // If nobody has evaluated the drawable state yet, then do it now. 12267 refreshDrawableState(); 12268 } 12269 needGlobalAttributesUpdate(false); 12270 } 12271 12272 void dispatchDetachedFromWindow() { 12273 AttachInfo info = mAttachInfo; 12274 if (info != null) { 12275 int vis = info.mWindowVisibility; 12276 if (vis != GONE) { 12277 onWindowVisibilityChanged(GONE); 12278 } 12279 } 12280 12281 onDetachedFromWindow(); 12282 12283 ListenerInfo li = mListenerInfo; 12284 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12285 li != null ? li.mOnAttachStateChangeListeners : null; 12286 if (listeners != null && listeners.size() > 0) { 12287 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12288 // perform the dispatching. The iterator is a safe guard against listeners that 12289 // could mutate the list by calling the various add/remove methods. This prevents 12290 // the array from being modified while we iterate it. 12291 for (OnAttachStateChangeListener listener : listeners) { 12292 listener.onViewDetachedFromWindow(this); 12293 } 12294 } 12295 12296 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 12297 mAttachInfo.mScrollContainers.remove(this); 12298 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 12299 } 12300 12301 mAttachInfo = null; 12302 if (mOverlay != null) { 12303 mOverlay.getOverlayView().dispatchDetachedFromWindow(); 12304 } 12305 } 12306 12307 /** 12308 * Store this view hierarchy's frozen state into the given container. 12309 * 12310 * @param container The SparseArray in which to save the view's state. 12311 * 12312 * @see #restoreHierarchyState(android.util.SparseArray) 12313 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12314 * @see #onSaveInstanceState() 12315 */ 12316 public void saveHierarchyState(SparseArray<Parcelable> container) { 12317 dispatchSaveInstanceState(container); 12318 } 12319 12320 /** 12321 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 12322 * this view and its children. May be overridden to modify how freezing happens to a 12323 * view's children; for example, some views may want to not store state for their children. 12324 * 12325 * @param container The SparseArray in which to save the view's state. 12326 * 12327 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12328 * @see #saveHierarchyState(android.util.SparseArray) 12329 * @see #onSaveInstanceState() 12330 */ 12331 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 12332 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 12333 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12334 Parcelable state = onSaveInstanceState(); 12335 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12336 throw new IllegalStateException( 12337 "Derived class did not call super.onSaveInstanceState()"); 12338 } 12339 if (state != null) { 12340 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12341 // + ": " + state); 12342 container.put(mID, state); 12343 } 12344 } 12345 } 12346 12347 /** 12348 * Hook allowing a view to generate a representation of its internal state 12349 * that can later be used to create a new instance with that same state. 12350 * This state should only contain information that is not persistent or can 12351 * not be reconstructed later. For example, you will never store your 12352 * current position on screen because that will be computed again when a 12353 * new instance of the view is placed in its view hierarchy. 12354 * <p> 12355 * Some examples of things you may store here: the current cursor position 12356 * in a text view (but usually not the text itself since that is stored in a 12357 * content provider or other persistent storage), the currently selected 12358 * item in a list view. 12359 * 12360 * @return Returns a Parcelable object containing the view's current dynamic 12361 * state, or null if there is nothing interesting to save. The 12362 * default implementation returns null. 12363 * @see #onRestoreInstanceState(android.os.Parcelable) 12364 * @see #saveHierarchyState(android.util.SparseArray) 12365 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12366 * @see #setSaveEnabled(boolean) 12367 */ 12368 protected Parcelable onSaveInstanceState() { 12369 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12370 return BaseSavedState.EMPTY_STATE; 12371 } 12372 12373 /** 12374 * Restore this view hierarchy's frozen state from the given container. 12375 * 12376 * @param container The SparseArray which holds previously frozen states. 12377 * 12378 * @see #saveHierarchyState(android.util.SparseArray) 12379 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12380 * @see #onRestoreInstanceState(android.os.Parcelable) 12381 */ 12382 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12383 dispatchRestoreInstanceState(container); 12384 } 12385 12386 /** 12387 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12388 * state for this view and its children. May be overridden to modify how restoring 12389 * happens to a view's children; for example, some views may want to not store state 12390 * for their children. 12391 * 12392 * @param container The SparseArray which holds previously saved state. 12393 * 12394 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12395 * @see #restoreHierarchyState(android.util.SparseArray) 12396 * @see #onRestoreInstanceState(android.os.Parcelable) 12397 */ 12398 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12399 if (mID != NO_ID) { 12400 Parcelable state = container.get(mID); 12401 if (state != null) { 12402 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12403 // + ": " + state); 12404 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12405 onRestoreInstanceState(state); 12406 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12407 throw new IllegalStateException( 12408 "Derived class did not call super.onRestoreInstanceState()"); 12409 } 12410 } 12411 } 12412 } 12413 12414 /** 12415 * Hook allowing a view to re-apply a representation of its internal state that had previously 12416 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12417 * null state. 12418 * 12419 * @param state The frozen state that had previously been returned by 12420 * {@link #onSaveInstanceState}. 12421 * 12422 * @see #onSaveInstanceState() 12423 * @see #restoreHierarchyState(android.util.SparseArray) 12424 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12425 */ 12426 protected void onRestoreInstanceState(Parcelable state) { 12427 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12428 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12429 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12430 + "received " + state.getClass().toString() + " instead. This usually happens " 12431 + "when two views of different type have the same id in the same hierarchy. " 12432 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12433 + "other views do not use the same id."); 12434 } 12435 } 12436 12437 /** 12438 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12439 * 12440 * @return the drawing start time in milliseconds 12441 */ 12442 public long getDrawingTime() { 12443 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12444 } 12445 12446 /** 12447 * <p>Enables or disables the duplication of the parent's state into this view. When 12448 * duplication is enabled, this view gets its drawable state from its parent rather 12449 * than from its own internal properties.</p> 12450 * 12451 * <p>Note: in the current implementation, setting this property to true after the 12452 * view was added to a ViewGroup might have no effect at all. This property should 12453 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12454 * 12455 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12456 * property is enabled, an exception will be thrown.</p> 12457 * 12458 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12459 * parent, these states should not be affected by this method.</p> 12460 * 12461 * @param enabled True to enable duplication of the parent's drawable state, false 12462 * to disable it. 12463 * 12464 * @see #getDrawableState() 12465 * @see #isDuplicateParentStateEnabled() 12466 */ 12467 public void setDuplicateParentStateEnabled(boolean enabled) { 12468 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12469 } 12470 12471 /** 12472 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12473 * 12474 * @return True if this view's drawable state is duplicated from the parent, 12475 * false otherwise 12476 * 12477 * @see #getDrawableState() 12478 * @see #setDuplicateParentStateEnabled(boolean) 12479 */ 12480 public boolean isDuplicateParentStateEnabled() { 12481 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12482 } 12483 12484 /** 12485 * <p>Specifies the type of layer backing this view. The layer can be 12486 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12487 * {@link #LAYER_TYPE_HARDWARE}.</p> 12488 * 12489 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12490 * instance that controls how the layer is composed on screen. The following 12491 * properties of the paint are taken into account when composing the layer:</p> 12492 * <ul> 12493 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12494 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12495 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12496 * </ul> 12497 * 12498 * <p>If this view has an alpha value set to < 1.0 by calling 12499 * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded 12500 * by this view's alpha value.</p> 12501 * 12502 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE}, 12503 * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} 12504 * for more information on when and how to use layers.</p> 12505 * 12506 * @param layerType The type of layer to use with this view, must be one of 12507 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12508 * {@link #LAYER_TYPE_HARDWARE} 12509 * @param paint The paint used to compose the layer. This argument is optional 12510 * and can be null. It is ignored when the layer type is 12511 * {@link #LAYER_TYPE_NONE} 12512 * 12513 * @see #getLayerType() 12514 * @see #LAYER_TYPE_NONE 12515 * @see #LAYER_TYPE_SOFTWARE 12516 * @see #LAYER_TYPE_HARDWARE 12517 * @see #setAlpha(float) 12518 * 12519 * @attr ref android.R.styleable#View_layerType 12520 */ 12521 public void setLayerType(int layerType, Paint paint) { 12522 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12523 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12524 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12525 } 12526 12527 if (layerType == mLayerType) { 12528 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12529 mLayerPaint = paint == null ? new Paint() : paint; 12530 invalidateParentCaches(); 12531 invalidate(true); 12532 } 12533 return; 12534 } 12535 12536 // Destroy any previous software drawing cache if needed 12537 switch (mLayerType) { 12538 case LAYER_TYPE_HARDWARE: 12539 destroyLayer(false); 12540 // fall through - non-accelerated views may use software layer mechanism instead 12541 case LAYER_TYPE_SOFTWARE: 12542 destroyDrawingCache(); 12543 break; 12544 default: 12545 break; 12546 } 12547 12548 mLayerType = layerType; 12549 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12550 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12551 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12552 12553 invalidateParentCaches(); 12554 invalidate(true); 12555 } 12556 12557 /** 12558 * Updates the {@link Paint} object used with the current layer (used only if the current 12559 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12560 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12561 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12562 * ensure that the view gets redrawn immediately. 12563 * 12564 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12565 * instance that controls how the layer is composed on screen. The following 12566 * properties of the paint are taken into account when composing the layer:</p> 12567 * <ul> 12568 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12569 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12570 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12571 * </ul> 12572 * 12573 * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the 12574 * alpha value of the layer's paint is superceded by this view's alpha value.</p> 12575 * 12576 * @param paint The paint used to compose the layer. This argument is optional 12577 * and can be null. It is ignored when the layer type is 12578 * {@link #LAYER_TYPE_NONE} 12579 * 12580 * @see #setLayerType(int, android.graphics.Paint) 12581 */ 12582 public void setLayerPaint(Paint paint) { 12583 int layerType = getLayerType(); 12584 if (layerType != LAYER_TYPE_NONE) { 12585 mLayerPaint = paint == null ? new Paint() : paint; 12586 if (layerType == LAYER_TYPE_HARDWARE) { 12587 HardwareLayer layer = getHardwareLayer(); 12588 if (layer != null) { 12589 layer.setLayerPaint(paint); 12590 } 12591 invalidateViewProperty(false, false); 12592 } else { 12593 invalidate(); 12594 } 12595 } 12596 } 12597 12598 /** 12599 * Indicates whether this view has a static layer. A view with layer type 12600 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12601 * dynamic. 12602 */ 12603 boolean hasStaticLayer() { 12604 return true; 12605 } 12606 12607 /** 12608 * Indicates what type of layer is currently associated with this view. By default 12609 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12610 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12611 * for more information on the different types of layers. 12612 * 12613 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12614 * {@link #LAYER_TYPE_HARDWARE} 12615 * 12616 * @see #setLayerType(int, android.graphics.Paint) 12617 * @see #buildLayer() 12618 * @see #LAYER_TYPE_NONE 12619 * @see #LAYER_TYPE_SOFTWARE 12620 * @see #LAYER_TYPE_HARDWARE 12621 */ 12622 public int getLayerType() { 12623 return mLayerType; 12624 } 12625 12626 /** 12627 * Forces this view's layer to be created and this view to be rendered 12628 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 12629 * invoking this method will have no effect. 12630 * 12631 * This method can for instance be used to render a view into its layer before 12632 * starting an animation. If this view is complex, rendering into the layer 12633 * before starting the animation will avoid skipping frames. 12634 * 12635 * @throws IllegalStateException If this view is not attached to a window 12636 * 12637 * @see #setLayerType(int, android.graphics.Paint) 12638 */ 12639 public void buildLayer() { 12640 if (mLayerType == LAYER_TYPE_NONE) return; 12641 12642 final AttachInfo attachInfo = mAttachInfo; 12643 if (attachInfo == null) { 12644 throw new IllegalStateException("This view must be attached to a window first"); 12645 } 12646 12647 switch (mLayerType) { 12648 case LAYER_TYPE_HARDWARE: 12649 if (attachInfo.mHardwareRenderer != null && 12650 attachInfo.mHardwareRenderer.isEnabled() && 12651 attachInfo.mHardwareRenderer.validate()) { 12652 getHardwareLayer(); 12653 // TODO: We need a better way to handle this case 12654 // If views have registered pre-draw listeners they need 12655 // to be notified before we build the layer. Those listeners 12656 // may however rely on other events to happen first so we 12657 // cannot just invoke them here until they don't cancel the 12658 // current frame 12659 if (!attachInfo.mTreeObserver.hasOnPreDrawListeners()) { 12660 attachInfo.mViewRootImpl.dispatchFlushHardwareLayerUpdates(); 12661 } 12662 } 12663 break; 12664 case LAYER_TYPE_SOFTWARE: 12665 buildDrawingCache(true); 12666 break; 12667 } 12668 } 12669 12670 /** 12671 * <p>Returns a hardware layer that can be used to draw this view again 12672 * without executing its draw method.</p> 12673 * 12674 * @return A HardwareLayer ready to render, or null if an error occurred. 12675 */ 12676 HardwareLayer getHardwareLayer() { 12677 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 12678 !mAttachInfo.mHardwareRenderer.isEnabled()) { 12679 return null; 12680 } 12681 12682 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 12683 12684 final int width = mRight - mLeft; 12685 final int height = mBottom - mTop; 12686 12687 if (width == 0 || height == 0) { 12688 return null; 12689 } 12690 12691 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 12692 if (mHardwareLayer == null) { 12693 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 12694 width, height, isOpaque()); 12695 mLocalDirtyRect.set(0, 0, width, height); 12696 } else { 12697 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 12698 if (mHardwareLayer.resize(width, height)) { 12699 mLocalDirtyRect.set(0, 0, width, height); 12700 } 12701 } 12702 12703 // This should not be necessary but applications that change 12704 // the parameters of their background drawable without calling 12705 // this.setBackground(Drawable) can leave the view in a bad state 12706 // (for instance isOpaque() returns true, but the background is 12707 // not opaque.) 12708 computeOpaqueFlags(); 12709 12710 final boolean opaque = isOpaque(); 12711 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 12712 mHardwareLayer.setOpaque(opaque); 12713 mLocalDirtyRect.set(0, 0, width, height); 12714 } 12715 } 12716 12717 // The layer is not valid if the underlying GPU resources cannot be allocated 12718 if (!mHardwareLayer.isValid()) { 12719 return null; 12720 } 12721 12722 mHardwareLayer.setLayerPaint(mLayerPaint); 12723 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 12724 ViewRootImpl viewRoot = getViewRootImpl(); 12725 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 12726 12727 mLocalDirtyRect.setEmpty(); 12728 } 12729 12730 return mHardwareLayer; 12731 } 12732 12733 /** 12734 * Destroys this View's hardware layer if possible. 12735 * 12736 * @return True if the layer was destroyed, false otherwise. 12737 * 12738 * @see #setLayerType(int, android.graphics.Paint) 12739 * @see #LAYER_TYPE_HARDWARE 12740 */ 12741 boolean destroyLayer(boolean valid) { 12742 if (mHardwareLayer != null) { 12743 AttachInfo info = mAttachInfo; 12744 if (info != null && info.mHardwareRenderer != null && 12745 info.mHardwareRenderer.isEnabled() && 12746 (valid || info.mHardwareRenderer.validate())) { 12747 12748 info.mHardwareRenderer.cancelLayerUpdate(mHardwareLayer); 12749 mHardwareLayer.destroy(); 12750 mHardwareLayer = null; 12751 12752 if (mDisplayList != null) { 12753 mDisplayList.reset(); 12754 } 12755 invalidate(true); 12756 invalidateParentCaches(); 12757 } 12758 return true; 12759 } 12760 return false; 12761 } 12762 12763 /** 12764 * Destroys all hardware rendering resources. This method is invoked 12765 * when the system needs to reclaim resources. Upon execution of this 12766 * method, you should free any OpenGL resources created by the view. 12767 * 12768 * Note: you <strong>must</strong> call 12769 * <code>super.destroyHardwareResources()</code> when overriding 12770 * this method. 12771 * 12772 * @hide 12773 */ 12774 protected void destroyHardwareResources() { 12775 clearDisplayList(); 12776 destroyLayer(true); 12777 } 12778 12779 /** 12780 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12781 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12782 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12783 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12784 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12785 * null.</p> 12786 * 12787 * <p>Enabling the drawing cache is similar to 12788 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12789 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12790 * drawing cache has no effect on rendering because the system uses a different mechanism 12791 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12792 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12793 * for information on how to enable software and hardware layers.</p> 12794 * 12795 * <p>This API can be used to manually generate 12796 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12797 * {@link #getDrawingCache()}.</p> 12798 * 12799 * @param enabled true to enable the drawing cache, false otherwise 12800 * 12801 * @see #isDrawingCacheEnabled() 12802 * @see #getDrawingCache() 12803 * @see #buildDrawingCache() 12804 * @see #setLayerType(int, android.graphics.Paint) 12805 */ 12806 public void setDrawingCacheEnabled(boolean enabled) { 12807 mCachingFailed = false; 12808 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12809 } 12810 12811 /** 12812 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12813 * 12814 * @return true if the drawing cache is enabled 12815 * 12816 * @see #setDrawingCacheEnabled(boolean) 12817 * @see #getDrawingCache() 12818 */ 12819 @ViewDebug.ExportedProperty(category = "drawing") 12820 public boolean isDrawingCacheEnabled() { 12821 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12822 } 12823 12824 /** 12825 * Debugging utility which recursively outputs the dirty state of a view and its 12826 * descendants. 12827 * 12828 * @hide 12829 */ 12830 @SuppressWarnings({"UnusedDeclaration"}) 12831 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12832 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 12833 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 12834 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 12835 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 12836 if (clear) { 12837 mPrivateFlags &= clearMask; 12838 } 12839 if (this instanceof ViewGroup) { 12840 ViewGroup parent = (ViewGroup) this; 12841 final int count = parent.getChildCount(); 12842 for (int i = 0; i < count; i++) { 12843 final View child = parent.getChildAt(i); 12844 child.outputDirtyFlags(indent + " ", clear, clearMask); 12845 } 12846 } 12847 } 12848 12849 /** 12850 * This method is used by ViewGroup to cause its children to restore or recreate their 12851 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12852 * to recreate its own display list, which would happen if it went through the normal 12853 * draw/dispatchDraw mechanisms. 12854 * 12855 * @hide 12856 */ 12857 protected void dispatchGetDisplayList() {} 12858 12859 /** 12860 * A view that is not attached or hardware accelerated cannot create a display list. 12861 * This method checks these conditions and returns the appropriate result. 12862 * 12863 * @return true if view has the ability to create a display list, false otherwise. 12864 * 12865 * @hide 12866 */ 12867 public boolean canHaveDisplayList() { 12868 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12869 } 12870 12871 /** 12872 * @return The {@link HardwareRenderer} associated with that view or null if 12873 * hardware rendering is not supported or this view is not attached 12874 * to a window. 12875 * 12876 * @hide 12877 */ 12878 public HardwareRenderer getHardwareRenderer() { 12879 if (mAttachInfo != null) { 12880 return mAttachInfo.mHardwareRenderer; 12881 } 12882 return null; 12883 } 12884 12885 /** 12886 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12887 * Otherwise, the same display list will be returned (after having been rendered into 12888 * along the way, depending on the invalidation state of the view). 12889 * 12890 * @param displayList The previous version of this displayList, could be null. 12891 * @param isLayer Whether the requester of the display list is a layer. If so, 12892 * the view will avoid creating a layer inside the resulting display list. 12893 * @return A new or reused DisplayList object. 12894 */ 12895 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12896 if (!canHaveDisplayList()) { 12897 return null; 12898 } 12899 12900 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 12901 displayList == null || !displayList.isValid() || 12902 (!isLayer && mRecreateDisplayList))) { 12903 // Don't need to recreate the display list, just need to tell our 12904 // children to restore/recreate theirs 12905 if (displayList != null && displayList.isValid() && 12906 !isLayer && !mRecreateDisplayList) { 12907 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12908 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12909 dispatchGetDisplayList(); 12910 12911 return displayList; 12912 } 12913 12914 if (!isLayer) { 12915 // If we got here, we're recreating it. Mark it as such to ensure that 12916 // we copy in child display lists into ours in drawChild() 12917 mRecreateDisplayList = true; 12918 } 12919 if (displayList == null) { 12920 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(getClass().getName()); 12921 // If we're creating a new display list, make sure our parent gets invalidated 12922 // since they will need to recreate their display list to account for this 12923 // new child display list. 12924 invalidateParentCaches(); 12925 } 12926 12927 boolean caching = false; 12928 int width = mRight - mLeft; 12929 int height = mBottom - mTop; 12930 int layerType = getLayerType(); 12931 12932 final HardwareCanvas canvas = displayList.start(width, height); 12933 12934 try { 12935 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12936 if (layerType == LAYER_TYPE_HARDWARE) { 12937 final HardwareLayer layer = getHardwareLayer(); 12938 if (layer != null && layer.isValid()) { 12939 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12940 } else { 12941 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12942 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12943 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12944 } 12945 caching = true; 12946 } else { 12947 buildDrawingCache(true); 12948 Bitmap cache = getDrawingCache(true); 12949 if (cache != null) { 12950 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12951 caching = true; 12952 } 12953 } 12954 } else { 12955 12956 computeScroll(); 12957 12958 canvas.translate(-mScrollX, -mScrollY); 12959 if (!isLayer) { 12960 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12961 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12962 } 12963 12964 // Fast path for layouts with no backgrounds 12965 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 12966 dispatchDraw(canvas); 12967 if (mOverlay != null && !mOverlay.isEmpty()) { 12968 mOverlay.getOverlayView().draw(canvas); 12969 } 12970 } else { 12971 draw(canvas); 12972 } 12973 } 12974 } finally { 12975 displayList.end(); 12976 displayList.setCaching(caching); 12977 if (isLayer) { 12978 displayList.setLeftTopRightBottom(0, 0, width, height); 12979 } else { 12980 setDisplayListProperties(displayList); 12981 } 12982 } 12983 } else if (!isLayer) { 12984 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12985 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12986 } 12987 12988 return displayList; 12989 } 12990 12991 /** 12992 * Get the DisplayList for the HardwareLayer 12993 * 12994 * @param layer The HardwareLayer whose DisplayList we want 12995 * @return A DisplayList fopr the specified HardwareLayer 12996 */ 12997 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12998 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12999 layer.setDisplayList(displayList); 13000 return displayList; 13001 } 13002 13003 13004 /** 13005 * <p>Returns a display list that can be used to draw this view again 13006 * without executing its draw method.</p> 13007 * 13008 * @return A DisplayList ready to replay, or null if caching is not enabled. 13009 * 13010 * @hide 13011 */ 13012 public DisplayList getDisplayList() { 13013 mDisplayList = getDisplayList(mDisplayList, false); 13014 return mDisplayList; 13015 } 13016 13017 private void clearDisplayList() { 13018 if (mDisplayList != null) { 13019 mDisplayList.clear(); 13020 } 13021 } 13022 13023 /** 13024 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 13025 * 13026 * @return A non-scaled bitmap representing this view or null if cache is disabled. 13027 * 13028 * @see #getDrawingCache(boolean) 13029 */ 13030 public Bitmap getDrawingCache() { 13031 return getDrawingCache(false); 13032 } 13033 13034 /** 13035 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 13036 * is null when caching is disabled. If caching is enabled and the cache is not ready, 13037 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 13038 * draw from the cache when the cache is enabled. To benefit from the cache, you must 13039 * request the drawing cache by calling this method and draw it on screen if the 13040 * returned bitmap is not null.</p> 13041 * 13042 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13043 * this method will create a bitmap of the same size as this view. Because this bitmap 13044 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13045 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13046 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13047 * size than the view. This implies that your application must be able to handle this 13048 * size.</p> 13049 * 13050 * @param autoScale Indicates whether the generated bitmap should be scaled based on 13051 * the current density of the screen when the application is in compatibility 13052 * mode. 13053 * 13054 * @return A bitmap representing this view or null if cache is disabled. 13055 * 13056 * @see #setDrawingCacheEnabled(boolean) 13057 * @see #isDrawingCacheEnabled() 13058 * @see #buildDrawingCache(boolean) 13059 * @see #destroyDrawingCache() 13060 */ 13061 public Bitmap getDrawingCache(boolean autoScale) { 13062 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 13063 return null; 13064 } 13065 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 13066 buildDrawingCache(autoScale); 13067 } 13068 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 13069 } 13070 13071 /** 13072 * <p>Frees the resources used by the drawing cache. If you call 13073 * {@link #buildDrawingCache()} manually without calling 13074 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13075 * should cleanup the cache with this method afterwards.</p> 13076 * 13077 * @see #setDrawingCacheEnabled(boolean) 13078 * @see #buildDrawingCache() 13079 * @see #getDrawingCache() 13080 */ 13081 public void destroyDrawingCache() { 13082 if (mDrawingCache != null) { 13083 mDrawingCache.recycle(); 13084 mDrawingCache = null; 13085 } 13086 if (mUnscaledDrawingCache != null) { 13087 mUnscaledDrawingCache.recycle(); 13088 mUnscaledDrawingCache = null; 13089 } 13090 } 13091 13092 /** 13093 * Setting a solid background color for the drawing cache's bitmaps will improve 13094 * performance and memory usage. Note, though that this should only be used if this 13095 * view will always be drawn on top of a solid color. 13096 * 13097 * @param color The background color to use for the drawing cache's bitmap 13098 * 13099 * @see #setDrawingCacheEnabled(boolean) 13100 * @see #buildDrawingCache() 13101 * @see #getDrawingCache() 13102 */ 13103 public void setDrawingCacheBackgroundColor(int color) { 13104 if (color != mDrawingCacheBackgroundColor) { 13105 mDrawingCacheBackgroundColor = color; 13106 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 13107 } 13108 } 13109 13110 /** 13111 * @see #setDrawingCacheBackgroundColor(int) 13112 * 13113 * @return The background color to used for the drawing cache's bitmap 13114 */ 13115 public int getDrawingCacheBackgroundColor() { 13116 return mDrawingCacheBackgroundColor; 13117 } 13118 13119 /** 13120 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 13121 * 13122 * @see #buildDrawingCache(boolean) 13123 */ 13124 public void buildDrawingCache() { 13125 buildDrawingCache(false); 13126 } 13127 13128 /** 13129 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 13130 * 13131 * <p>If you call {@link #buildDrawingCache()} manually without calling 13132 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13133 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 13134 * 13135 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13136 * this method will create a bitmap of the same size as this view. Because this bitmap 13137 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13138 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13139 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13140 * size than the view. This implies that your application must be able to handle this 13141 * size.</p> 13142 * 13143 * <p>You should avoid calling this method when hardware acceleration is enabled. If 13144 * you do not need the drawing cache bitmap, calling this method will increase memory 13145 * usage and cause the view to be rendered in software once, thus negatively impacting 13146 * performance.</p> 13147 * 13148 * @see #getDrawingCache() 13149 * @see #destroyDrawingCache() 13150 */ 13151 public void buildDrawingCache(boolean autoScale) { 13152 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 13153 mDrawingCache == null : mUnscaledDrawingCache == null)) { 13154 mCachingFailed = false; 13155 13156 int width = mRight - mLeft; 13157 int height = mBottom - mTop; 13158 13159 final AttachInfo attachInfo = mAttachInfo; 13160 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 13161 13162 if (autoScale && scalingRequired) { 13163 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 13164 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 13165 } 13166 13167 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 13168 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 13169 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 13170 13171 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 13172 final long drawingCacheSize = 13173 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 13174 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 13175 if (width > 0 && height > 0) { 13176 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 13177 + projectedBitmapSize + " bytes, only " 13178 + drawingCacheSize + " available"); 13179 } 13180 destroyDrawingCache(); 13181 mCachingFailed = true; 13182 return; 13183 } 13184 13185 boolean clear = true; 13186 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 13187 13188 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 13189 Bitmap.Config quality; 13190 if (!opaque) { 13191 // Never pick ARGB_4444 because it looks awful 13192 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 13193 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 13194 case DRAWING_CACHE_QUALITY_AUTO: 13195 quality = Bitmap.Config.ARGB_8888; 13196 break; 13197 case DRAWING_CACHE_QUALITY_LOW: 13198 quality = Bitmap.Config.ARGB_8888; 13199 break; 13200 case DRAWING_CACHE_QUALITY_HIGH: 13201 quality = Bitmap.Config.ARGB_8888; 13202 break; 13203 default: 13204 quality = Bitmap.Config.ARGB_8888; 13205 break; 13206 } 13207 } else { 13208 // Optimization for translucent windows 13209 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 13210 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 13211 } 13212 13213 // Try to cleanup memory 13214 if (bitmap != null) bitmap.recycle(); 13215 13216 try { 13217 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13218 width, height, quality); 13219 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 13220 if (autoScale) { 13221 mDrawingCache = bitmap; 13222 } else { 13223 mUnscaledDrawingCache = bitmap; 13224 } 13225 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 13226 } catch (OutOfMemoryError e) { 13227 // If there is not enough memory to create the bitmap cache, just 13228 // ignore the issue as bitmap caches are not required to draw the 13229 // view hierarchy 13230 if (autoScale) { 13231 mDrawingCache = null; 13232 } else { 13233 mUnscaledDrawingCache = null; 13234 } 13235 mCachingFailed = true; 13236 return; 13237 } 13238 13239 clear = drawingCacheBackgroundColor != 0; 13240 } 13241 13242 Canvas canvas; 13243 if (attachInfo != null) { 13244 canvas = attachInfo.mCanvas; 13245 if (canvas == null) { 13246 canvas = new Canvas(); 13247 } 13248 canvas.setBitmap(bitmap); 13249 // Temporarily clobber the cached Canvas in case one of our children 13250 // is also using a drawing cache. Without this, the children would 13251 // steal the canvas by attaching their own bitmap to it and bad, bad 13252 // thing would happen (invisible views, corrupted drawings, etc.) 13253 attachInfo.mCanvas = null; 13254 } else { 13255 // This case should hopefully never or seldom happen 13256 canvas = new Canvas(bitmap); 13257 } 13258 13259 if (clear) { 13260 bitmap.eraseColor(drawingCacheBackgroundColor); 13261 } 13262 13263 computeScroll(); 13264 final int restoreCount = canvas.save(); 13265 13266 if (autoScale && scalingRequired) { 13267 final float scale = attachInfo.mApplicationScale; 13268 canvas.scale(scale, scale); 13269 } 13270 13271 canvas.translate(-mScrollX, -mScrollY); 13272 13273 mPrivateFlags |= PFLAG_DRAWN; 13274 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 13275 mLayerType != LAYER_TYPE_NONE) { 13276 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 13277 } 13278 13279 // Fast path for layouts with no backgrounds 13280 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13281 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13282 dispatchDraw(canvas); 13283 if (mOverlay != null && !mOverlay.isEmpty()) { 13284 mOverlay.getOverlayView().draw(canvas); 13285 } 13286 } else { 13287 draw(canvas); 13288 } 13289 13290 canvas.restoreToCount(restoreCount); 13291 canvas.setBitmap(null); 13292 13293 if (attachInfo != null) { 13294 // Restore the cached Canvas for our siblings 13295 attachInfo.mCanvas = canvas; 13296 } 13297 } 13298 } 13299 13300 /** 13301 * Create a snapshot of the view into a bitmap. We should probably make 13302 * some form of this public, but should think about the API. 13303 */ 13304 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 13305 int width = mRight - mLeft; 13306 int height = mBottom - mTop; 13307 13308 final AttachInfo attachInfo = mAttachInfo; 13309 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 13310 width = (int) ((width * scale) + 0.5f); 13311 height = (int) ((height * scale) + 0.5f); 13312 13313 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13314 width > 0 ? width : 1, height > 0 ? height : 1, quality); 13315 if (bitmap == null) { 13316 throw new OutOfMemoryError(); 13317 } 13318 13319 Resources resources = getResources(); 13320 if (resources != null) { 13321 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 13322 } 13323 13324 Canvas canvas; 13325 if (attachInfo != null) { 13326 canvas = attachInfo.mCanvas; 13327 if (canvas == null) { 13328 canvas = new Canvas(); 13329 } 13330 canvas.setBitmap(bitmap); 13331 // Temporarily clobber the cached Canvas in case one of our children 13332 // is also using a drawing cache. Without this, the children would 13333 // steal the canvas by attaching their own bitmap to it and bad, bad 13334 // things would happen (invisible views, corrupted drawings, etc.) 13335 attachInfo.mCanvas = null; 13336 } else { 13337 // This case should hopefully never or seldom happen 13338 canvas = new Canvas(bitmap); 13339 } 13340 13341 if ((backgroundColor & 0xff000000) != 0) { 13342 bitmap.eraseColor(backgroundColor); 13343 } 13344 13345 computeScroll(); 13346 final int restoreCount = canvas.save(); 13347 canvas.scale(scale, scale); 13348 canvas.translate(-mScrollX, -mScrollY); 13349 13350 // Temporarily remove the dirty mask 13351 int flags = mPrivateFlags; 13352 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13353 13354 // Fast path for layouts with no backgrounds 13355 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13356 dispatchDraw(canvas); 13357 } else { 13358 draw(canvas); 13359 } 13360 13361 mPrivateFlags = flags; 13362 13363 canvas.restoreToCount(restoreCount); 13364 canvas.setBitmap(null); 13365 13366 if (attachInfo != null) { 13367 // Restore the cached Canvas for our siblings 13368 attachInfo.mCanvas = canvas; 13369 } 13370 13371 return bitmap; 13372 } 13373 13374 /** 13375 * Indicates whether this View is currently in edit mode. A View is usually 13376 * in edit mode when displayed within a developer tool. For instance, if 13377 * this View is being drawn by a visual user interface builder, this method 13378 * should return true. 13379 * 13380 * Subclasses should check the return value of this method to provide 13381 * different behaviors if their normal behavior might interfere with the 13382 * host environment. For instance: the class spawns a thread in its 13383 * constructor, the drawing code relies on device-specific features, etc. 13384 * 13385 * This method is usually checked in the drawing code of custom widgets. 13386 * 13387 * @return True if this View is in edit mode, false otherwise. 13388 */ 13389 public boolean isInEditMode() { 13390 return false; 13391 } 13392 13393 /** 13394 * If the View draws content inside its padding and enables fading edges, 13395 * it needs to support padding offsets. Padding offsets are added to the 13396 * fading edges to extend the length of the fade so that it covers pixels 13397 * drawn inside the padding. 13398 * 13399 * Subclasses of this class should override this method if they need 13400 * to draw content inside the padding. 13401 * 13402 * @return True if padding offset must be applied, false otherwise. 13403 * 13404 * @see #getLeftPaddingOffset() 13405 * @see #getRightPaddingOffset() 13406 * @see #getTopPaddingOffset() 13407 * @see #getBottomPaddingOffset() 13408 * 13409 * @since CURRENT 13410 */ 13411 protected boolean isPaddingOffsetRequired() { 13412 return false; 13413 } 13414 13415 /** 13416 * Amount by which to extend the left fading region. Called only when 13417 * {@link #isPaddingOffsetRequired()} returns true. 13418 * 13419 * @return The left padding offset in pixels. 13420 * 13421 * @see #isPaddingOffsetRequired() 13422 * 13423 * @since CURRENT 13424 */ 13425 protected int getLeftPaddingOffset() { 13426 return 0; 13427 } 13428 13429 /** 13430 * Amount by which to extend the right fading region. Called only when 13431 * {@link #isPaddingOffsetRequired()} returns true. 13432 * 13433 * @return The right padding offset in pixels. 13434 * 13435 * @see #isPaddingOffsetRequired() 13436 * 13437 * @since CURRENT 13438 */ 13439 protected int getRightPaddingOffset() { 13440 return 0; 13441 } 13442 13443 /** 13444 * Amount by which to extend the top fading region. Called only when 13445 * {@link #isPaddingOffsetRequired()} returns true. 13446 * 13447 * @return The top padding offset in pixels. 13448 * 13449 * @see #isPaddingOffsetRequired() 13450 * 13451 * @since CURRENT 13452 */ 13453 protected int getTopPaddingOffset() { 13454 return 0; 13455 } 13456 13457 /** 13458 * Amount by which to extend the bottom fading region. Called only when 13459 * {@link #isPaddingOffsetRequired()} returns true. 13460 * 13461 * @return The bottom padding offset in pixels. 13462 * 13463 * @see #isPaddingOffsetRequired() 13464 * 13465 * @since CURRENT 13466 */ 13467 protected int getBottomPaddingOffset() { 13468 return 0; 13469 } 13470 13471 /** 13472 * @hide 13473 * @param offsetRequired 13474 */ 13475 protected int getFadeTop(boolean offsetRequired) { 13476 int top = mPaddingTop; 13477 if (offsetRequired) top += getTopPaddingOffset(); 13478 return top; 13479 } 13480 13481 /** 13482 * @hide 13483 * @param offsetRequired 13484 */ 13485 protected int getFadeHeight(boolean offsetRequired) { 13486 int padding = mPaddingTop; 13487 if (offsetRequired) padding += getTopPaddingOffset(); 13488 return mBottom - mTop - mPaddingBottom - padding; 13489 } 13490 13491 /** 13492 * <p>Indicates whether this view is attached to a hardware accelerated 13493 * window or not.</p> 13494 * 13495 * <p>Even if this method returns true, it does not mean that every call 13496 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13497 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13498 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13499 * window is hardware accelerated, 13500 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13501 * return false, and this method will return true.</p> 13502 * 13503 * @return True if the view is attached to a window and the window is 13504 * hardware accelerated; false in any other case. 13505 */ 13506 public boolean isHardwareAccelerated() { 13507 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13508 } 13509 13510 /** 13511 * Sets a rectangular area on this view to which the view will be clipped 13512 * when it is drawn. Setting the value to null will remove the clip bounds 13513 * and the view will draw normally, using its full bounds. 13514 * 13515 * @param clipBounds The rectangular area, in the local coordinates of 13516 * this view, to which future drawing operations will be clipped. 13517 */ 13518 public void setClipBounds(Rect clipBounds) { 13519 if (clipBounds != null) { 13520 if (clipBounds.equals(mClipBounds)) { 13521 return; 13522 } 13523 if (mClipBounds == null) { 13524 invalidate(); 13525 mClipBounds = new Rect(clipBounds); 13526 } else { 13527 invalidate(Math.min(mClipBounds.left, clipBounds.left), 13528 Math.min(mClipBounds.top, clipBounds.top), 13529 Math.max(mClipBounds.right, clipBounds.right), 13530 Math.max(mClipBounds.bottom, clipBounds.bottom)); 13531 mClipBounds.set(clipBounds); 13532 } 13533 } else { 13534 if (mClipBounds != null) { 13535 invalidate(); 13536 mClipBounds = null; 13537 } 13538 } 13539 } 13540 13541 /** 13542 * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. 13543 * 13544 * @return A copy of the current clip bounds if clip bounds are set, 13545 * otherwise null. 13546 */ 13547 public Rect getClipBounds() { 13548 return (mClipBounds != null) ? new Rect(mClipBounds) : null; 13549 } 13550 13551 /** 13552 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13553 * case of an active Animation being run on the view. 13554 */ 13555 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13556 Animation a, boolean scalingRequired) { 13557 Transformation invalidationTransform; 13558 final int flags = parent.mGroupFlags; 13559 final boolean initialized = a.isInitialized(); 13560 if (!initialized) { 13561 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13562 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13563 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13564 onAnimationStart(); 13565 } 13566 13567 final Transformation t = parent.getChildTransformation(); 13568 boolean more = a.getTransformation(drawingTime, t, 1f); 13569 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13570 if (parent.mInvalidationTransformation == null) { 13571 parent.mInvalidationTransformation = new Transformation(); 13572 } 13573 invalidationTransform = parent.mInvalidationTransformation; 13574 a.getTransformation(drawingTime, invalidationTransform, 1f); 13575 } else { 13576 invalidationTransform = t; 13577 } 13578 13579 if (more) { 13580 if (!a.willChangeBounds()) { 13581 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13582 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13583 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13584 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13585 // The child need to draw an animation, potentially offscreen, so 13586 // make sure we do not cancel invalidate requests 13587 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13588 parent.invalidate(mLeft, mTop, mRight, mBottom); 13589 } 13590 } else { 13591 if (parent.mInvalidateRegion == null) { 13592 parent.mInvalidateRegion = new RectF(); 13593 } 13594 final RectF region = parent.mInvalidateRegion; 13595 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13596 invalidationTransform); 13597 13598 // The child need to draw an animation, potentially offscreen, so 13599 // make sure we do not cancel invalidate requests 13600 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13601 13602 final int left = mLeft + (int) region.left; 13603 final int top = mTop + (int) region.top; 13604 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13605 top + (int) (region.height() + .5f)); 13606 } 13607 } 13608 return more; 13609 } 13610 13611 /** 13612 * This method is called by getDisplayList() when a display list is created or re-rendered. 13613 * It sets or resets the current value of all properties on that display list (resetting is 13614 * necessary when a display list is being re-created, because we need to make sure that 13615 * previously-set transform values 13616 */ 13617 void setDisplayListProperties(DisplayList displayList) { 13618 if (displayList != null) { 13619 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13620 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13621 if (mParent instanceof ViewGroup) { 13622 displayList.setClipToBounds( 13623 (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 13624 } 13625 float alpha = 1; 13626 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 13627 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13628 ViewGroup parentVG = (ViewGroup) mParent; 13629 final Transformation t = parentVG.getChildTransformation(); 13630 if (parentVG.getChildStaticTransformation(this, t)) { 13631 final int transformType = t.getTransformationType(); 13632 if (transformType != Transformation.TYPE_IDENTITY) { 13633 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 13634 alpha = t.getAlpha(); 13635 } 13636 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 13637 displayList.setMatrix(t.getMatrix()); 13638 } 13639 } 13640 } 13641 } 13642 if (mTransformationInfo != null) { 13643 alpha *= mTransformationInfo.mAlpha; 13644 if (alpha < 1) { 13645 final int multipliedAlpha = (int) (255 * alpha); 13646 if (onSetAlpha(multipliedAlpha)) { 13647 alpha = 1; 13648 } 13649 } 13650 displayList.setTransformationInfo(alpha, 13651 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 13652 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 13653 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 13654 mTransformationInfo.mScaleY); 13655 if (mTransformationInfo.mCamera == null) { 13656 mTransformationInfo.mCamera = new Camera(); 13657 mTransformationInfo.matrix3D = new Matrix(); 13658 } 13659 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 13660 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 13661 displayList.setPivotX(getPivotX()); 13662 displayList.setPivotY(getPivotY()); 13663 } 13664 } else if (alpha < 1) { 13665 displayList.setAlpha(alpha); 13666 } 13667 } 13668 } 13669 13670 /** 13671 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 13672 * This draw() method is an implementation detail and is not intended to be overridden or 13673 * to be called from anywhere else other than ViewGroup.drawChild(). 13674 */ 13675 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 13676 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13677 boolean more = false; 13678 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 13679 final int flags = parent.mGroupFlags; 13680 13681 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 13682 parent.getChildTransformation().clear(); 13683 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13684 } 13685 13686 Transformation transformToApply = null; 13687 boolean concatMatrix = false; 13688 13689 boolean scalingRequired = false; 13690 boolean caching; 13691 int layerType = getLayerType(); 13692 13693 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 13694 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 13695 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 13696 caching = true; 13697 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 13698 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 13699 } else { 13700 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 13701 } 13702 13703 final Animation a = getAnimation(); 13704 if (a != null) { 13705 more = drawAnimation(parent, drawingTime, a, scalingRequired); 13706 concatMatrix = a.willChangeTransformationMatrix(); 13707 if (concatMatrix) { 13708 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13709 } 13710 transformToApply = parent.getChildTransformation(); 13711 } else { 13712 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == 13713 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { 13714 // No longer animating: clear out old animation matrix 13715 mDisplayList.setAnimationMatrix(null); 13716 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13717 } 13718 if (!useDisplayListProperties && 13719 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13720 final Transformation t = parent.getChildTransformation(); 13721 final boolean hasTransform = parent.getChildStaticTransformation(this, t); 13722 if (hasTransform) { 13723 final int transformType = t.getTransformationType(); 13724 transformToApply = transformType != Transformation.TYPE_IDENTITY ? t : null; 13725 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 13726 } 13727 } 13728 } 13729 13730 concatMatrix |= !childHasIdentityMatrix; 13731 13732 // Sets the flag as early as possible to allow draw() implementations 13733 // to call invalidate() successfully when doing animations 13734 mPrivateFlags |= PFLAG_DRAWN; 13735 13736 if (!concatMatrix && 13737 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 13738 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 13739 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 13740 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 13741 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 13742 return more; 13743 } 13744 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 13745 13746 if (hardwareAccelerated) { 13747 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 13748 // retain the flag's value temporarily in the mRecreateDisplayList flag 13749 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 13750 mPrivateFlags &= ~PFLAG_INVALIDATED; 13751 } 13752 13753 DisplayList displayList = null; 13754 Bitmap cache = null; 13755 boolean hasDisplayList = false; 13756 if (caching) { 13757 if (!hardwareAccelerated) { 13758 if (layerType != LAYER_TYPE_NONE) { 13759 layerType = LAYER_TYPE_SOFTWARE; 13760 buildDrawingCache(true); 13761 } 13762 cache = getDrawingCache(true); 13763 } else { 13764 switch (layerType) { 13765 case LAYER_TYPE_SOFTWARE: 13766 if (useDisplayListProperties) { 13767 hasDisplayList = canHaveDisplayList(); 13768 } else { 13769 buildDrawingCache(true); 13770 cache = getDrawingCache(true); 13771 } 13772 break; 13773 case LAYER_TYPE_HARDWARE: 13774 if (useDisplayListProperties) { 13775 hasDisplayList = canHaveDisplayList(); 13776 } 13777 break; 13778 case LAYER_TYPE_NONE: 13779 // Delay getting the display list until animation-driven alpha values are 13780 // set up and possibly passed on to the view 13781 hasDisplayList = canHaveDisplayList(); 13782 break; 13783 } 13784 } 13785 } 13786 useDisplayListProperties &= hasDisplayList; 13787 if (useDisplayListProperties) { 13788 displayList = getDisplayList(); 13789 if (!displayList.isValid()) { 13790 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13791 // to getDisplayList(), the display list will be marked invalid and we should not 13792 // try to use it again. 13793 displayList = null; 13794 hasDisplayList = false; 13795 useDisplayListProperties = false; 13796 } 13797 } 13798 13799 int sx = 0; 13800 int sy = 0; 13801 if (!hasDisplayList) { 13802 computeScroll(); 13803 sx = mScrollX; 13804 sy = mScrollY; 13805 } 13806 13807 final boolean hasNoCache = cache == null || hasDisplayList; 13808 final boolean offsetForScroll = cache == null && !hasDisplayList && 13809 layerType != LAYER_TYPE_HARDWARE; 13810 13811 int restoreTo = -1; 13812 if (!useDisplayListProperties || transformToApply != null) { 13813 restoreTo = canvas.save(); 13814 } 13815 if (offsetForScroll) { 13816 canvas.translate(mLeft - sx, mTop - sy); 13817 } else { 13818 if (!useDisplayListProperties) { 13819 canvas.translate(mLeft, mTop); 13820 } 13821 if (scalingRequired) { 13822 if (useDisplayListProperties) { 13823 // TODO: Might not need this if we put everything inside the DL 13824 restoreTo = canvas.save(); 13825 } 13826 // mAttachInfo cannot be null, otherwise scalingRequired == false 13827 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13828 canvas.scale(scale, scale); 13829 } 13830 } 13831 13832 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13833 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13834 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13835 if (transformToApply != null || !childHasIdentityMatrix) { 13836 int transX = 0; 13837 int transY = 0; 13838 13839 if (offsetForScroll) { 13840 transX = -sx; 13841 transY = -sy; 13842 } 13843 13844 if (transformToApply != null) { 13845 if (concatMatrix) { 13846 if (useDisplayListProperties) { 13847 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13848 } else { 13849 // Undo the scroll translation, apply the transformation matrix, 13850 // then redo the scroll translate to get the correct result. 13851 canvas.translate(-transX, -transY); 13852 canvas.concat(transformToApply.getMatrix()); 13853 canvas.translate(transX, transY); 13854 } 13855 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13856 } 13857 13858 float transformAlpha = transformToApply.getAlpha(); 13859 if (transformAlpha < 1) { 13860 alpha *= transformAlpha; 13861 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13862 } 13863 } 13864 13865 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13866 canvas.translate(-transX, -transY); 13867 canvas.concat(getMatrix()); 13868 canvas.translate(transX, transY); 13869 } 13870 } 13871 13872 // Deal with alpha if it is or used to be <1 13873 if (alpha < 1 || 13874 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13875 if (alpha < 1) { 13876 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13877 } else { 13878 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13879 } 13880 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13881 if (hasNoCache) { 13882 final int multipliedAlpha = (int) (255 * alpha); 13883 if (!onSetAlpha(multipliedAlpha)) { 13884 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13885 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13886 layerType != LAYER_TYPE_NONE) { 13887 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13888 } 13889 if (useDisplayListProperties) { 13890 displayList.setAlpha(alpha * getAlpha()); 13891 } else if (layerType == LAYER_TYPE_NONE) { 13892 final int scrollX = hasDisplayList ? 0 : sx; 13893 final int scrollY = hasDisplayList ? 0 : sy; 13894 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13895 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13896 } 13897 } else { 13898 // Alpha is handled by the child directly, clobber the layer's alpha 13899 mPrivateFlags |= PFLAG_ALPHA_SET; 13900 } 13901 } 13902 } 13903 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13904 onSetAlpha(255); 13905 mPrivateFlags &= ~PFLAG_ALPHA_SET; 13906 } 13907 13908 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13909 !useDisplayListProperties && cache == null) { 13910 if (offsetForScroll) { 13911 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13912 } else { 13913 if (!scalingRequired || cache == null) { 13914 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13915 } else { 13916 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13917 } 13918 } 13919 } 13920 13921 if (!useDisplayListProperties && hasDisplayList) { 13922 displayList = getDisplayList(); 13923 if (!displayList.isValid()) { 13924 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13925 // to getDisplayList(), the display list will be marked invalid and we should not 13926 // try to use it again. 13927 displayList = null; 13928 hasDisplayList = false; 13929 } 13930 } 13931 13932 if (hasNoCache) { 13933 boolean layerRendered = false; 13934 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13935 final HardwareLayer layer = getHardwareLayer(); 13936 if (layer != null && layer.isValid()) { 13937 mLayerPaint.setAlpha((int) (alpha * 255)); 13938 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13939 layerRendered = true; 13940 } else { 13941 final int scrollX = hasDisplayList ? 0 : sx; 13942 final int scrollY = hasDisplayList ? 0 : sy; 13943 canvas.saveLayer(scrollX, scrollY, 13944 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13945 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13946 } 13947 } 13948 13949 if (!layerRendered) { 13950 if (!hasDisplayList) { 13951 // Fast path for layouts with no backgrounds 13952 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13953 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13954 dispatchDraw(canvas); 13955 } else { 13956 draw(canvas); 13957 } 13958 } else { 13959 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13960 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13961 } 13962 } 13963 } else if (cache != null) { 13964 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13965 Paint cachePaint; 13966 13967 if (layerType == LAYER_TYPE_NONE) { 13968 cachePaint = parent.mCachePaint; 13969 if (cachePaint == null) { 13970 cachePaint = new Paint(); 13971 cachePaint.setDither(false); 13972 parent.mCachePaint = cachePaint; 13973 } 13974 if (alpha < 1) { 13975 cachePaint.setAlpha((int) (alpha * 255)); 13976 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13977 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13978 cachePaint.setAlpha(255); 13979 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13980 } 13981 } else { 13982 cachePaint = mLayerPaint; 13983 cachePaint.setAlpha((int) (alpha * 255)); 13984 } 13985 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13986 } 13987 13988 if (restoreTo >= 0) { 13989 canvas.restoreToCount(restoreTo); 13990 } 13991 13992 if (a != null && !more) { 13993 if (!hardwareAccelerated && !a.getFillAfter()) { 13994 onSetAlpha(255); 13995 } 13996 parent.finishAnimatingView(this, a); 13997 } 13998 13999 if (more && hardwareAccelerated) { 14000 // invalidation is the trigger to recreate display lists, so if we're using 14001 // display lists to render, force an invalidate to allow the animation to 14002 // continue drawing another frame 14003 parent.invalidate(true); 14004 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 14005 // alpha animations should cause the child to recreate its display list 14006 invalidate(true); 14007 } 14008 } 14009 14010 mRecreateDisplayList = false; 14011 14012 return more; 14013 } 14014 14015 /** 14016 * Manually render this view (and all of its children) to the given Canvas. 14017 * The view must have already done a full layout before this function is 14018 * called. When implementing a view, implement 14019 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 14020 * If you do need to override this method, call the superclass version. 14021 * 14022 * @param canvas The Canvas to which the View is rendered. 14023 */ 14024 public void draw(Canvas canvas) { 14025 if (mClipBounds != null) { 14026 canvas.clipRect(mClipBounds); 14027 } 14028 final int privateFlags = mPrivateFlags; 14029 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 14030 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 14031 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 14032 14033 /* 14034 * Draw traversal performs several drawing steps which must be executed 14035 * in the appropriate order: 14036 * 14037 * 1. Draw the background 14038 * 2. If necessary, save the canvas' layers to prepare for fading 14039 * 3. Draw view's content 14040 * 4. Draw children 14041 * 5. If necessary, draw the fading edges and restore layers 14042 * 6. Draw decorations (scrollbars for instance) 14043 */ 14044 14045 // Step 1, draw the background, if needed 14046 int saveCount; 14047 14048 if (!dirtyOpaque) { 14049 final Drawable background = mBackground; 14050 if (background != null) { 14051 final int scrollX = mScrollX; 14052 final int scrollY = mScrollY; 14053 14054 if (mBackgroundSizeChanged) { 14055 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 14056 mBackgroundSizeChanged = false; 14057 } 14058 14059 if ((scrollX | scrollY) == 0) { 14060 background.draw(canvas); 14061 } else { 14062 canvas.translate(scrollX, scrollY); 14063 background.draw(canvas); 14064 canvas.translate(-scrollX, -scrollY); 14065 } 14066 } 14067 } 14068 14069 // skip step 2 & 5 if possible (common case) 14070 final int viewFlags = mViewFlags; 14071 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 14072 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 14073 if (!verticalEdges && !horizontalEdges) { 14074 // Step 3, draw the content 14075 if (!dirtyOpaque) onDraw(canvas); 14076 14077 // Step 4, draw the children 14078 dispatchDraw(canvas); 14079 14080 // Step 6, draw decorations (scrollbars) 14081 onDrawScrollBars(canvas); 14082 14083 if (mOverlay != null && !mOverlay.isEmpty()) { 14084 mOverlay.getOverlayView().dispatchDraw(canvas); 14085 } 14086 14087 // we're done... 14088 return; 14089 } 14090 14091 /* 14092 * Here we do the full fledged routine... 14093 * (this is an uncommon case where speed matters less, 14094 * this is why we repeat some of the tests that have been 14095 * done above) 14096 */ 14097 14098 boolean drawTop = false; 14099 boolean drawBottom = false; 14100 boolean drawLeft = false; 14101 boolean drawRight = false; 14102 14103 float topFadeStrength = 0.0f; 14104 float bottomFadeStrength = 0.0f; 14105 float leftFadeStrength = 0.0f; 14106 float rightFadeStrength = 0.0f; 14107 14108 // Step 2, save the canvas' layers 14109 int paddingLeft = mPaddingLeft; 14110 14111 final boolean offsetRequired = isPaddingOffsetRequired(); 14112 if (offsetRequired) { 14113 paddingLeft += getLeftPaddingOffset(); 14114 } 14115 14116 int left = mScrollX + paddingLeft; 14117 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 14118 int top = mScrollY + getFadeTop(offsetRequired); 14119 int bottom = top + getFadeHeight(offsetRequired); 14120 14121 if (offsetRequired) { 14122 right += getRightPaddingOffset(); 14123 bottom += getBottomPaddingOffset(); 14124 } 14125 14126 final ScrollabilityCache scrollabilityCache = mScrollCache; 14127 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 14128 int length = (int) fadeHeight; 14129 14130 // clip the fade length if top and bottom fades overlap 14131 // overlapping fades produce odd-looking artifacts 14132 if (verticalEdges && (top + length > bottom - length)) { 14133 length = (bottom - top) / 2; 14134 } 14135 14136 // also clip horizontal fades if necessary 14137 if (horizontalEdges && (left + length > right - length)) { 14138 length = (right - left) / 2; 14139 } 14140 14141 if (verticalEdges) { 14142 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 14143 drawTop = topFadeStrength * fadeHeight > 1.0f; 14144 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 14145 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 14146 } 14147 14148 if (horizontalEdges) { 14149 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 14150 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 14151 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 14152 drawRight = rightFadeStrength * fadeHeight > 1.0f; 14153 } 14154 14155 saveCount = canvas.getSaveCount(); 14156 14157 int solidColor = getSolidColor(); 14158 if (solidColor == 0) { 14159 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14160 14161 if (drawTop) { 14162 canvas.saveLayer(left, top, right, top + length, null, flags); 14163 } 14164 14165 if (drawBottom) { 14166 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 14167 } 14168 14169 if (drawLeft) { 14170 canvas.saveLayer(left, top, left + length, bottom, null, flags); 14171 } 14172 14173 if (drawRight) { 14174 canvas.saveLayer(right - length, top, right, bottom, null, flags); 14175 } 14176 } else { 14177 scrollabilityCache.setFadeColor(solidColor); 14178 } 14179 14180 // Step 3, draw the content 14181 if (!dirtyOpaque) onDraw(canvas); 14182 14183 // Step 4, draw the children 14184 dispatchDraw(canvas); 14185 14186 // Step 5, draw the fade effect and restore layers 14187 final Paint p = scrollabilityCache.paint; 14188 final Matrix matrix = scrollabilityCache.matrix; 14189 final Shader fade = scrollabilityCache.shader; 14190 14191 if (drawTop) { 14192 matrix.setScale(1, fadeHeight * topFadeStrength); 14193 matrix.postTranslate(left, top); 14194 fade.setLocalMatrix(matrix); 14195 canvas.drawRect(left, top, right, top + length, p); 14196 } 14197 14198 if (drawBottom) { 14199 matrix.setScale(1, fadeHeight * bottomFadeStrength); 14200 matrix.postRotate(180); 14201 matrix.postTranslate(left, bottom); 14202 fade.setLocalMatrix(matrix); 14203 canvas.drawRect(left, bottom - length, right, bottom, p); 14204 } 14205 14206 if (drawLeft) { 14207 matrix.setScale(1, fadeHeight * leftFadeStrength); 14208 matrix.postRotate(-90); 14209 matrix.postTranslate(left, top); 14210 fade.setLocalMatrix(matrix); 14211 canvas.drawRect(left, top, left + length, bottom, p); 14212 } 14213 14214 if (drawRight) { 14215 matrix.setScale(1, fadeHeight * rightFadeStrength); 14216 matrix.postRotate(90); 14217 matrix.postTranslate(right, top); 14218 fade.setLocalMatrix(matrix); 14219 canvas.drawRect(right - length, top, right, bottom, p); 14220 } 14221 14222 canvas.restoreToCount(saveCount); 14223 14224 // Step 6, draw decorations (scrollbars) 14225 onDrawScrollBars(canvas); 14226 14227 if (mOverlay != null && !mOverlay.isEmpty()) { 14228 mOverlay.getOverlayView().dispatchDraw(canvas); 14229 } 14230 } 14231 14232 /** 14233 * Returns the overlay for this view, creating it if it does not yet exist. 14234 * Adding drawables to the overlay will cause them to be displayed whenever 14235 * the view itself is redrawn. Objects in the overlay should be actively 14236 * managed: remove them when they should not be displayed anymore. The 14237 * overlay will always have the same size as its host view. 14238 * 14239 * <p>Note: Overlays do not currently work correctly with {@link 14240 * SurfaceView} or {@link TextureView}; contents in overlays for these 14241 * types of views may not display correctly.</p> 14242 * 14243 * @return The ViewOverlay object for this view. 14244 * @see ViewOverlay 14245 */ 14246 public ViewOverlay getOverlay() { 14247 if (mOverlay == null) { 14248 mOverlay = new ViewOverlay(mContext, this); 14249 } 14250 return mOverlay; 14251 } 14252 14253 /** 14254 * Override this if your view is known to always be drawn on top of a solid color background, 14255 * and needs to draw fading edges. Returning a non-zero color enables the view system to 14256 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 14257 * should be set to 0xFF. 14258 * 14259 * @see #setVerticalFadingEdgeEnabled(boolean) 14260 * @see #setHorizontalFadingEdgeEnabled(boolean) 14261 * 14262 * @return The known solid color background for this view, or 0 if the color may vary 14263 */ 14264 @ViewDebug.ExportedProperty(category = "drawing") 14265 public int getSolidColor() { 14266 return 0; 14267 } 14268 14269 /** 14270 * Build a human readable string representation of the specified view flags. 14271 * 14272 * @param flags the view flags to convert to a string 14273 * @return a String representing the supplied flags 14274 */ 14275 private static String printFlags(int flags) { 14276 String output = ""; 14277 int numFlags = 0; 14278 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 14279 output += "TAKES_FOCUS"; 14280 numFlags++; 14281 } 14282 14283 switch (flags & VISIBILITY_MASK) { 14284 case INVISIBLE: 14285 if (numFlags > 0) { 14286 output += " "; 14287 } 14288 output += "INVISIBLE"; 14289 // USELESS HERE numFlags++; 14290 break; 14291 case GONE: 14292 if (numFlags > 0) { 14293 output += " "; 14294 } 14295 output += "GONE"; 14296 // USELESS HERE numFlags++; 14297 break; 14298 default: 14299 break; 14300 } 14301 return output; 14302 } 14303 14304 /** 14305 * Build a human readable string representation of the specified private 14306 * view flags. 14307 * 14308 * @param privateFlags the private view flags to convert to a string 14309 * @return a String representing the supplied flags 14310 */ 14311 private static String printPrivateFlags(int privateFlags) { 14312 String output = ""; 14313 int numFlags = 0; 14314 14315 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 14316 output += "WANTS_FOCUS"; 14317 numFlags++; 14318 } 14319 14320 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 14321 if (numFlags > 0) { 14322 output += " "; 14323 } 14324 output += "FOCUSED"; 14325 numFlags++; 14326 } 14327 14328 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 14329 if (numFlags > 0) { 14330 output += " "; 14331 } 14332 output += "SELECTED"; 14333 numFlags++; 14334 } 14335 14336 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 14337 if (numFlags > 0) { 14338 output += " "; 14339 } 14340 output += "IS_ROOT_NAMESPACE"; 14341 numFlags++; 14342 } 14343 14344 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 14345 if (numFlags > 0) { 14346 output += " "; 14347 } 14348 output += "HAS_BOUNDS"; 14349 numFlags++; 14350 } 14351 14352 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 14353 if (numFlags > 0) { 14354 output += " "; 14355 } 14356 output += "DRAWN"; 14357 // USELESS HERE numFlags++; 14358 } 14359 return output; 14360 } 14361 14362 /** 14363 * <p>Indicates whether or not this view's layout will be requested during 14364 * the next hierarchy layout pass.</p> 14365 * 14366 * @return true if the layout will be forced during next layout pass 14367 */ 14368 public boolean isLayoutRequested() { 14369 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 14370 } 14371 14372 /** 14373 * Return true if o is a ViewGroup that is laying out using optical bounds. 14374 * @hide 14375 */ 14376 public static boolean isLayoutModeOptical(Object o) { 14377 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 14378 } 14379 14380 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 14381 Insets parentInsets = mParent instanceof View ? 14382 ((View) mParent).getOpticalInsets() : Insets.NONE; 14383 Insets childInsets = getOpticalInsets(); 14384 return setFrame( 14385 left + parentInsets.left - childInsets.left, 14386 top + parentInsets.top - childInsets.top, 14387 right + parentInsets.left + childInsets.right, 14388 bottom + parentInsets.top + childInsets.bottom); 14389 } 14390 14391 /** 14392 * Assign a size and position to a view and all of its 14393 * descendants 14394 * 14395 * <p>This is the second phase of the layout mechanism. 14396 * (The first is measuring). In this phase, each parent calls 14397 * layout on all of its children to position them. 14398 * This is typically done using the child measurements 14399 * that were stored in the measure pass().</p> 14400 * 14401 * <p>Derived classes should not override this method. 14402 * Derived classes with children should override 14403 * onLayout. In that method, they should 14404 * call layout on each of their children.</p> 14405 * 14406 * @param l Left position, relative to parent 14407 * @param t Top position, relative to parent 14408 * @param r Right position, relative to parent 14409 * @param b Bottom position, relative to parent 14410 */ 14411 @SuppressWarnings({"unchecked"}) 14412 public void layout(int l, int t, int r, int b) { 14413 if ((mPrivateFlags3 & PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT) != 0) { 14414 onMeasure(mOldWidthMeasureSpec, mOldHeightMeasureSpec); 14415 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 14416 } 14417 14418 int oldL = mLeft; 14419 int oldT = mTop; 14420 int oldB = mBottom; 14421 int oldR = mRight; 14422 14423 boolean changed = isLayoutModeOptical(mParent) ? 14424 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14425 14426 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14427 onLayout(changed, l, t, r, b); 14428 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14429 14430 ListenerInfo li = mListenerInfo; 14431 if (li != null && li.mOnLayoutChangeListeners != null) { 14432 ArrayList<OnLayoutChangeListener> listenersCopy = 14433 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14434 int numListeners = listenersCopy.size(); 14435 for (int i = 0; i < numListeners; ++i) { 14436 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14437 } 14438 } 14439 } 14440 14441 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14442 mPrivateFlags3 |= PFLAG3_IS_LAID_OUT; 14443 } 14444 14445 /** 14446 * Called from layout when this view should 14447 * assign a size and position to each of its children. 14448 * 14449 * Derived classes with children should override 14450 * this method and call layout on each of 14451 * their children. 14452 * @param changed This is a new size or position for this view 14453 * @param left Left position, relative to parent 14454 * @param top Top position, relative to parent 14455 * @param right Right position, relative to parent 14456 * @param bottom Bottom position, relative to parent 14457 */ 14458 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14459 } 14460 14461 /** 14462 * Assign a size and position to this view. 14463 * 14464 * This is called from layout. 14465 * 14466 * @param left Left position, relative to parent 14467 * @param top Top position, relative to parent 14468 * @param right Right position, relative to parent 14469 * @param bottom Bottom position, relative to parent 14470 * @return true if the new size and position are different than the 14471 * previous ones 14472 * {@hide} 14473 */ 14474 protected boolean setFrame(int left, int top, int right, int bottom) { 14475 boolean changed = false; 14476 14477 if (DBG) { 14478 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14479 + right + "," + bottom + ")"); 14480 } 14481 14482 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14483 changed = true; 14484 14485 // Remember our drawn bit 14486 int drawn = mPrivateFlags & PFLAG_DRAWN; 14487 14488 int oldWidth = mRight - mLeft; 14489 int oldHeight = mBottom - mTop; 14490 int newWidth = right - left; 14491 int newHeight = bottom - top; 14492 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14493 14494 // Invalidate our old position 14495 invalidate(sizeChanged); 14496 14497 mLeft = left; 14498 mTop = top; 14499 mRight = right; 14500 mBottom = bottom; 14501 if (mDisplayList != null) { 14502 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14503 } 14504 14505 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14506 14507 14508 if (sizeChanged) { 14509 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14510 // A change in dimension means an auto-centered pivot point changes, too 14511 if (mTransformationInfo != null) { 14512 mTransformationInfo.mMatrixDirty = true; 14513 } 14514 } 14515 sizeChange(newWidth, newHeight, oldWidth, oldHeight); 14516 } 14517 14518 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14519 // If we are visible, force the DRAWN bit to on so that 14520 // this invalidate will go through (at least to our parent). 14521 // This is because someone may have invalidated this view 14522 // before this call to setFrame came in, thereby clearing 14523 // the DRAWN bit. 14524 mPrivateFlags |= PFLAG_DRAWN; 14525 invalidate(sizeChanged); 14526 // parent display list may need to be recreated based on a change in the bounds 14527 // of any child 14528 invalidateParentCaches(); 14529 } 14530 14531 // Reset drawn bit to original value (invalidate turns it off) 14532 mPrivateFlags |= drawn; 14533 14534 mBackgroundSizeChanged = true; 14535 14536 notifySubtreeAccessibilityStateChangedIfNeeded(); 14537 } 14538 return changed; 14539 } 14540 14541 private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { 14542 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14543 if (mOverlay != null) { 14544 mOverlay.getOverlayView().setRight(newWidth); 14545 mOverlay.getOverlayView().setBottom(newHeight); 14546 } 14547 } 14548 14549 /** 14550 * Finalize inflating a view from XML. This is called as the last phase 14551 * of inflation, after all child views have been added. 14552 * 14553 * <p>Even if the subclass overrides onFinishInflate, they should always be 14554 * sure to call the super method, so that we get called. 14555 */ 14556 protected void onFinishInflate() { 14557 } 14558 14559 /** 14560 * Returns the resources associated with this view. 14561 * 14562 * @return Resources object. 14563 */ 14564 public Resources getResources() { 14565 return mResources; 14566 } 14567 14568 /** 14569 * Invalidates the specified Drawable. 14570 * 14571 * @param drawable the drawable to invalidate 14572 */ 14573 public void invalidateDrawable(Drawable drawable) { 14574 if (verifyDrawable(drawable)) { 14575 final Rect dirty = drawable.getBounds(); 14576 final int scrollX = mScrollX; 14577 final int scrollY = mScrollY; 14578 14579 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14580 dirty.right + scrollX, dirty.bottom + scrollY); 14581 } 14582 } 14583 14584 /** 14585 * Schedules an action on a drawable to occur at a specified time. 14586 * 14587 * @param who the recipient of the action 14588 * @param what the action to run on the drawable 14589 * @param when the time at which the action must occur. Uses the 14590 * {@link SystemClock#uptimeMillis} timebase. 14591 */ 14592 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14593 if (verifyDrawable(who) && what != null) { 14594 final long delay = when - SystemClock.uptimeMillis(); 14595 if (mAttachInfo != null) { 14596 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14597 Choreographer.CALLBACK_ANIMATION, what, who, 14598 Choreographer.subtractFrameDelay(delay)); 14599 } else { 14600 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14601 } 14602 } 14603 } 14604 14605 /** 14606 * Cancels a scheduled action on a drawable. 14607 * 14608 * @param who the recipient of the action 14609 * @param what the action to cancel 14610 */ 14611 public void unscheduleDrawable(Drawable who, Runnable what) { 14612 if (verifyDrawable(who) && what != null) { 14613 if (mAttachInfo != null) { 14614 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14615 Choreographer.CALLBACK_ANIMATION, what, who); 14616 } else { 14617 ViewRootImpl.getRunQueue().removeCallbacks(what); 14618 } 14619 } 14620 } 14621 14622 /** 14623 * Unschedule any events associated with the given Drawable. This can be 14624 * used when selecting a new Drawable into a view, so that the previous 14625 * one is completely unscheduled. 14626 * 14627 * @param who The Drawable to unschedule. 14628 * 14629 * @see #drawableStateChanged 14630 */ 14631 public void unscheduleDrawable(Drawable who) { 14632 if (mAttachInfo != null && who != null) { 14633 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14634 Choreographer.CALLBACK_ANIMATION, null, who); 14635 } 14636 } 14637 14638 /** 14639 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 14640 * that the View directionality can and will be resolved before its Drawables. 14641 * 14642 * Will call {@link View#onResolveDrawables} when resolution is done. 14643 * 14644 * @hide 14645 */ 14646 protected void resolveDrawables() { 14647 if (canResolveLayoutDirection()) { 14648 if (mBackground != null) { 14649 mBackground.setLayoutDirection(getLayoutDirection()); 14650 } 14651 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 14652 onResolveDrawables(getLayoutDirection()); 14653 } 14654 } 14655 14656 /** 14657 * Called when layout direction has been resolved. 14658 * 14659 * The default implementation does nothing. 14660 * 14661 * @param layoutDirection The resolved layout direction. 14662 * 14663 * @see #LAYOUT_DIRECTION_LTR 14664 * @see #LAYOUT_DIRECTION_RTL 14665 * 14666 * @hide 14667 */ 14668 public void onResolveDrawables(int layoutDirection) { 14669 } 14670 14671 /** 14672 * @hide 14673 */ 14674 protected void resetResolvedDrawables() { 14675 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 14676 } 14677 14678 private boolean isDrawablesResolved() { 14679 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 14680 } 14681 14682 /** 14683 * If your view subclass is displaying its own Drawable objects, it should 14684 * override this function and return true for any Drawable it is 14685 * displaying. This allows animations for those drawables to be 14686 * scheduled. 14687 * 14688 * <p>Be sure to call through to the super class when overriding this 14689 * function. 14690 * 14691 * @param who The Drawable to verify. Return true if it is one you are 14692 * displaying, else return the result of calling through to the 14693 * super class. 14694 * 14695 * @return boolean If true than the Drawable is being displayed in the 14696 * view; else false and it is not allowed to animate. 14697 * 14698 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 14699 * @see #drawableStateChanged() 14700 */ 14701 protected boolean verifyDrawable(Drawable who) { 14702 return who == mBackground; 14703 } 14704 14705 /** 14706 * This function is called whenever the state of the view changes in such 14707 * a way that it impacts the state of drawables being shown. 14708 * 14709 * <p>Be sure to call through to the superclass when overriding this 14710 * function. 14711 * 14712 * @see Drawable#setState(int[]) 14713 */ 14714 protected void drawableStateChanged() { 14715 Drawable d = mBackground; 14716 if (d != null && d.isStateful()) { 14717 d.setState(getDrawableState()); 14718 } 14719 } 14720 14721 /** 14722 * Call this to force a view to update its drawable state. This will cause 14723 * drawableStateChanged to be called on this view. Views that are interested 14724 * in the new state should call getDrawableState. 14725 * 14726 * @see #drawableStateChanged 14727 * @see #getDrawableState 14728 */ 14729 public void refreshDrawableState() { 14730 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 14731 drawableStateChanged(); 14732 14733 ViewParent parent = mParent; 14734 if (parent != null) { 14735 parent.childDrawableStateChanged(this); 14736 } 14737 } 14738 14739 /** 14740 * Return an array of resource IDs of the drawable states representing the 14741 * current state of the view. 14742 * 14743 * @return The current drawable state 14744 * 14745 * @see Drawable#setState(int[]) 14746 * @see #drawableStateChanged() 14747 * @see #onCreateDrawableState(int) 14748 */ 14749 public final int[] getDrawableState() { 14750 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 14751 return mDrawableState; 14752 } else { 14753 mDrawableState = onCreateDrawableState(0); 14754 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 14755 return mDrawableState; 14756 } 14757 } 14758 14759 /** 14760 * Generate the new {@link android.graphics.drawable.Drawable} state for 14761 * this view. This is called by the view 14762 * system when the cached Drawable state is determined to be invalid. To 14763 * retrieve the current state, you should use {@link #getDrawableState}. 14764 * 14765 * @param extraSpace if non-zero, this is the number of extra entries you 14766 * would like in the returned array in which you can place your own 14767 * states. 14768 * 14769 * @return Returns an array holding the current {@link Drawable} state of 14770 * the view. 14771 * 14772 * @see #mergeDrawableStates(int[], int[]) 14773 */ 14774 protected int[] onCreateDrawableState(int extraSpace) { 14775 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 14776 mParent instanceof View) { 14777 return ((View) mParent).onCreateDrawableState(extraSpace); 14778 } 14779 14780 int[] drawableState; 14781 14782 int privateFlags = mPrivateFlags; 14783 14784 int viewStateIndex = 0; 14785 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 14786 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 14787 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 14788 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 14789 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 14790 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 14791 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 14792 HardwareRenderer.isAvailable()) { 14793 // This is set if HW acceleration is requested, even if the current 14794 // process doesn't allow it. This is just to allow app preview 14795 // windows to better match their app. 14796 viewStateIndex |= VIEW_STATE_ACCELERATED; 14797 } 14798 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 14799 14800 final int privateFlags2 = mPrivateFlags2; 14801 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 14802 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 14803 14804 drawableState = VIEW_STATE_SETS[viewStateIndex]; 14805 14806 //noinspection ConstantIfStatement 14807 if (false) { 14808 Log.i("View", "drawableStateIndex=" + viewStateIndex); 14809 Log.i("View", toString() 14810 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 14811 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 14812 + " fo=" + hasFocus() 14813 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 14814 + " wf=" + hasWindowFocus() 14815 + ": " + Arrays.toString(drawableState)); 14816 } 14817 14818 if (extraSpace == 0) { 14819 return drawableState; 14820 } 14821 14822 final int[] fullState; 14823 if (drawableState != null) { 14824 fullState = new int[drawableState.length + extraSpace]; 14825 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 14826 } else { 14827 fullState = new int[extraSpace]; 14828 } 14829 14830 return fullState; 14831 } 14832 14833 /** 14834 * Merge your own state values in <var>additionalState</var> into the base 14835 * state values <var>baseState</var> that were returned by 14836 * {@link #onCreateDrawableState(int)}. 14837 * 14838 * @param baseState The base state values returned by 14839 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 14840 * own additional state values. 14841 * 14842 * @param additionalState The additional state values you would like 14843 * added to <var>baseState</var>; this array is not modified. 14844 * 14845 * @return As a convenience, the <var>baseState</var> array you originally 14846 * passed into the function is returned. 14847 * 14848 * @see #onCreateDrawableState(int) 14849 */ 14850 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 14851 final int N = baseState.length; 14852 int i = N - 1; 14853 while (i >= 0 && baseState[i] == 0) { 14854 i--; 14855 } 14856 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 14857 return baseState; 14858 } 14859 14860 /** 14861 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 14862 * on all Drawable objects associated with this view. 14863 */ 14864 public void jumpDrawablesToCurrentState() { 14865 if (mBackground != null) { 14866 mBackground.jumpToCurrentState(); 14867 } 14868 } 14869 14870 /** 14871 * Sets the background color for this view. 14872 * @param color the color of the background 14873 */ 14874 @RemotableViewMethod 14875 public void setBackgroundColor(int color) { 14876 if (mBackground instanceof ColorDrawable) { 14877 ((ColorDrawable) mBackground.mutate()).setColor(color); 14878 computeOpaqueFlags(); 14879 mBackgroundResource = 0; 14880 } else { 14881 setBackground(new ColorDrawable(color)); 14882 } 14883 } 14884 14885 /** 14886 * Set the background to a given resource. The resource should refer to 14887 * a Drawable object or 0 to remove the background. 14888 * @param resid The identifier of the resource. 14889 * 14890 * @attr ref android.R.styleable#View_background 14891 */ 14892 @RemotableViewMethod 14893 public void setBackgroundResource(int resid) { 14894 if (resid != 0 && resid == mBackgroundResource) { 14895 return; 14896 } 14897 14898 Drawable d= null; 14899 if (resid != 0) { 14900 d = mResources.getDrawable(resid); 14901 } 14902 setBackground(d); 14903 14904 mBackgroundResource = resid; 14905 } 14906 14907 /** 14908 * Set the background to a given Drawable, or remove the background. If the 14909 * background has padding, this View's padding is set to the background's 14910 * padding. However, when a background is removed, this View's padding isn't 14911 * touched. If setting the padding is desired, please use 14912 * {@link #setPadding(int, int, int, int)}. 14913 * 14914 * @param background The Drawable to use as the background, or null to remove the 14915 * background 14916 */ 14917 public void setBackground(Drawable background) { 14918 //noinspection deprecation 14919 setBackgroundDrawable(background); 14920 } 14921 14922 /** 14923 * @deprecated use {@link #setBackground(Drawable)} instead 14924 */ 14925 @Deprecated 14926 public void setBackgroundDrawable(Drawable background) { 14927 computeOpaqueFlags(); 14928 14929 if (background == mBackground) { 14930 return; 14931 } 14932 14933 boolean requestLayout = false; 14934 14935 mBackgroundResource = 0; 14936 14937 /* 14938 * Regardless of whether we're setting a new background or not, we want 14939 * to clear the previous drawable. 14940 */ 14941 if (mBackground != null) { 14942 mBackground.setCallback(null); 14943 unscheduleDrawable(mBackground); 14944 } 14945 14946 if (background != null) { 14947 Rect padding = sThreadLocal.get(); 14948 if (padding == null) { 14949 padding = new Rect(); 14950 sThreadLocal.set(padding); 14951 } 14952 resetResolvedDrawables(); 14953 background.setLayoutDirection(getLayoutDirection()); 14954 if (background.getPadding(padding)) { 14955 resetResolvedPadding(); 14956 switch (background.getLayoutDirection()) { 14957 case LAYOUT_DIRECTION_RTL: 14958 mUserPaddingLeftInitial = padding.right; 14959 mUserPaddingRightInitial = padding.left; 14960 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 14961 break; 14962 case LAYOUT_DIRECTION_LTR: 14963 default: 14964 mUserPaddingLeftInitial = padding.left; 14965 mUserPaddingRightInitial = padding.right; 14966 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 14967 } 14968 } 14969 14970 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14971 // if it has a different minimum size, we should layout again 14972 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14973 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14974 requestLayout = true; 14975 } 14976 14977 background.setCallback(this); 14978 if (background.isStateful()) { 14979 background.setState(getDrawableState()); 14980 } 14981 background.setVisible(getVisibility() == VISIBLE, false); 14982 mBackground = background; 14983 14984 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 14985 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 14986 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 14987 requestLayout = true; 14988 } 14989 } else { 14990 /* Remove the background */ 14991 mBackground = null; 14992 14993 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 14994 /* 14995 * This view ONLY drew the background before and we're removing 14996 * the background, so now it won't draw anything 14997 * (hence we SKIP_DRAW) 14998 */ 14999 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 15000 mPrivateFlags |= PFLAG_SKIP_DRAW; 15001 } 15002 15003 /* 15004 * When the background is set, we try to apply its padding to this 15005 * View. When the background is removed, we don't touch this View's 15006 * padding. This is noted in the Javadocs. Hence, we don't need to 15007 * requestLayout(), the invalidate() below is sufficient. 15008 */ 15009 15010 // The old background's minimum size could have affected this 15011 // View's layout, so let's requestLayout 15012 requestLayout = true; 15013 } 15014 15015 computeOpaqueFlags(); 15016 15017 if (requestLayout) { 15018 requestLayout(); 15019 } 15020 15021 mBackgroundSizeChanged = true; 15022 invalidate(true); 15023 } 15024 15025 /** 15026 * Gets the background drawable 15027 * 15028 * @return The drawable used as the background for this view, if any. 15029 * 15030 * @see #setBackground(Drawable) 15031 * 15032 * @attr ref android.R.styleable#View_background 15033 */ 15034 public Drawable getBackground() { 15035 return mBackground; 15036 } 15037 15038 /** 15039 * Sets the padding. The view may add on the space required to display 15040 * the scrollbars, depending on the style and visibility of the scrollbars. 15041 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 15042 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 15043 * from the values set in this call. 15044 * 15045 * @attr ref android.R.styleable#View_padding 15046 * @attr ref android.R.styleable#View_paddingBottom 15047 * @attr ref android.R.styleable#View_paddingLeft 15048 * @attr ref android.R.styleable#View_paddingRight 15049 * @attr ref android.R.styleable#View_paddingTop 15050 * @param left the left padding in pixels 15051 * @param top the top padding in pixels 15052 * @param right the right padding in pixels 15053 * @param bottom the bottom padding in pixels 15054 */ 15055 public void setPadding(int left, int top, int right, int bottom) { 15056 resetResolvedPadding(); 15057 15058 mUserPaddingStart = UNDEFINED_PADDING; 15059 mUserPaddingEnd = UNDEFINED_PADDING; 15060 15061 mUserPaddingLeftInitial = left; 15062 mUserPaddingRightInitial = right; 15063 15064 internalSetPadding(left, top, right, bottom); 15065 } 15066 15067 /** 15068 * @hide 15069 */ 15070 protected void internalSetPadding(int left, int top, int right, int bottom) { 15071 mUserPaddingLeft = left; 15072 mUserPaddingRight = right; 15073 mUserPaddingBottom = bottom; 15074 15075 final int viewFlags = mViewFlags; 15076 boolean changed = false; 15077 15078 // Common case is there are no scroll bars. 15079 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 15080 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 15081 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 15082 ? 0 : getVerticalScrollbarWidth(); 15083 switch (mVerticalScrollbarPosition) { 15084 case SCROLLBAR_POSITION_DEFAULT: 15085 if (isLayoutRtl()) { 15086 left += offset; 15087 } else { 15088 right += offset; 15089 } 15090 break; 15091 case SCROLLBAR_POSITION_RIGHT: 15092 right += offset; 15093 break; 15094 case SCROLLBAR_POSITION_LEFT: 15095 left += offset; 15096 break; 15097 } 15098 } 15099 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 15100 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 15101 ? 0 : getHorizontalScrollbarHeight(); 15102 } 15103 } 15104 15105 if (mPaddingLeft != left) { 15106 changed = true; 15107 mPaddingLeft = left; 15108 } 15109 if (mPaddingTop != top) { 15110 changed = true; 15111 mPaddingTop = top; 15112 } 15113 if (mPaddingRight != right) { 15114 changed = true; 15115 mPaddingRight = right; 15116 } 15117 if (mPaddingBottom != bottom) { 15118 changed = true; 15119 mPaddingBottom = bottom; 15120 } 15121 15122 if (changed) { 15123 requestLayout(); 15124 } 15125 } 15126 15127 /** 15128 * Sets the relative padding. The view may add on the space required to display 15129 * the scrollbars, depending on the style and visibility of the scrollbars. 15130 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 15131 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 15132 * from the values set in this call. 15133 * 15134 * @attr ref android.R.styleable#View_padding 15135 * @attr ref android.R.styleable#View_paddingBottom 15136 * @attr ref android.R.styleable#View_paddingStart 15137 * @attr ref android.R.styleable#View_paddingEnd 15138 * @attr ref android.R.styleable#View_paddingTop 15139 * @param start the start padding in pixels 15140 * @param top the top padding in pixels 15141 * @param end the end padding in pixels 15142 * @param bottom the bottom padding in pixels 15143 */ 15144 public void setPaddingRelative(int start, int top, int end, int bottom) { 15145 resetResolvedPadding(); 15146 15147 mUserPaddingStart = start; 15148 mUserPaddingEnd = end; 15149 15150 switch(getLayoutDirection()) { 15151 case LAYOUT_DIRECTION_RTL: 15152 mUserPaddingLeftInitial = end; 15153 mUserPaddingRightInitial = start; 15154 internalSetPadding(end, top, start, bottom); 15155 break; 15156 case LAYOUT_DIRECTION_LTR: 15157 default: 15158 mUserPaddingLeftInitial = start; 15159 mUserPaddingRightInitial = end; 15160 internalSetPadding(start, top, end, bottom); 15161 } 15162 } 15163 15164 /** 15165 * Returns the top padding of this view. 15166 * 15167 * @return the top padding in pixels 15168 */ 15169 public int getPaddingTop() { 15170 return mPaddingTop; 15171 } 15172 15173 /** 15174 * Returns the bottom padding of this view. If there are inset and enabled 15175 * scrollbars, this value may include the space required to display the 15176 * scrollbars as well. 15177 * 15178 * @return the bottom padding in pixels 15179 */ 15180 public int getPaddingBottom() { 15181 return mPaddingBottom; 15182 } 15183 15184 /** 15185 * Returns the left padding of this view. If there are inset and enabled 15186 * scrollbars, this value may include the space required to display the 15187 * scrollbars as well. 15188 * 15189 * @return the left padding in pixels 15190 */ 15191 public int getPaddingLeft() { 15192 if (!isPaddingResolved()) { 15193 resolvePadding(); 15194 } 15195 return mPaddingLeft; 15196 } 15197 15198 /** 15199 * Returns the start padding of this view depending on its resolved layout direction. 15200 * If there are inset and enabled scrollbars, this value may include the space 15201 * required to display the scrollbars as well. 15202 * 15203 * @return the start padding in pixels 15204 */ 15205 public int getPaddingStart() { 15206 if (!isPaddingResolved()) { 15207 resolvePadding(); 15208 } 15209 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15210 mPaddingRight : mPaddingLeft; 15211 } 15212 15213 /** 15214 * Returns the right padding of this view. If there are inset and enabled 15215 * scrollbars, this value may include the space required to display the 15216 * scrollbars as well. 15217 * 15218 * @return the right padding in pixels 15219 */ 15220 public int getPaddingRight() { 15221 if (!isPaddingResolved()) { 15222 resolvePadding(); 15223 } 15224 return mPaddingRight; 15225 } 15226 15227 /** 15228 * Returns the end padding of this view depending on its resolved layout direction. 15229 * If there are inset and enabled scrollbars, this value may include the space 15230 * required to display the scrollbars as well. 15231 * 15232 * @return the end padding in pixels 15233 */ 15234 public int getPaddingEnd() { 15235 if (!isPaddingResolved()) { 15236 resolvePadding(); 15237 } 15238 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15239 mPaddingLeft : mPaddingRight; 15240 } 15241 15242 /** 15243 * Return if the padding as been set thru relative values 15244 * {@link #setPaddingRelative(int, int, int, int)} or thru 15245 * @attr ref android.R.styleable#View_paddingStart or 15246 * @attr ref android.R.styleable#View_paddingEnd 15247 * 15248 * @return true if the padding is relative or false if it is not. 15249 */ 15250 public boolean isPaddingRelative() { 15251 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 15252 } 15253 15254 Insets computeOpticalInsets() { 15255 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 15256 } 15257 15258 /** 15259 * @hide 15260 */ 15261 public void resetPaddingToInitialValues() { 15262 if (isRtlCompatibilityMode()) { 15263 mPaddingLeft = mUserPaddingLeftInitial; 15264 mPaddingRight = mUserPaddingRightInitial; 15265 return; 15266 } 15267 if (isLayoutRtl()) { 15268 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 15269 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 15270 } else { 15271 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 15272 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 15273 } 15274 } 15275 15276 /** 15277 * @hide 15278 */ 15279 public Insets getOpticalInsets() { 15280 if (mLayoutInsets == null) { 15281 mLayoutInsets = computeOpticalInsets(); 15282 } 15283 return mLayoutInsets; 15284 } 15285 15286 /** 15287 * Changes the selection state of this view. A view can be selected or not. 15288 * Note that selection is not the same as focus. Views are typically 15289 * selected in the context of an AdapterView like ListView or GridView; 15290 * the selected view is the view that is highlighted. 15291 * 15292 * @param selected true if the view must be selected, false otherwise 15293 */ 15294 public void setSelected(boolean selected) { 15295 //noinspection DoubleNegation 15296 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 15297 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 15298 if (!selected) resetPressedState(); 15299 invalidate(true); 15300 refreshDrawableState(); 15301 dispatchSetSelected(selected); 15302 notifyViewAccessibilityStateChangedIfNeeded(); 15303 } 15304 } 15305 15306 /** 15307 * Dispatch setSelected to all of this View's children. 15308 * 15309 * @see #setSelected(boolean) 15310 * 15311 * @param selected The new selected state 15312 */ 15313 protected void dispatchSetSelected(boolean selected) { 15314 } 15315 15316 /** 15317 * Indicates the selection state of this view. 15318 * 15319 * @return true if the view is selected, false otherwise 15320 */ 15321 @ViewDebug.ExportedProperty 15322 public boolean isSelected() { 15323 return (mPrivateFlags & PFLAG_SELECTED) != 0; 15324 } 15325 15326 /** 15327 * Changes the activated state of this view. A view can be activated or not. 15328 * Note that activation is not the same as selection. Selection is 15329 * a transient property, representing the view (hierarchy) the user is 15330 * currently interacting with. Activation is a longer-term state that the 15331 * user can move views in and out of. For example, in a list view with 15332 * single or multiple selection enabled, the views in the current selection 15333 * set are activated. (Um, yeah, we are deeply sorry about the terminology 15334 * here.) The activated state is propagated down to children of the view it 15335 * is set on. 15336 * 15337 * @param activated true if the view must be activated, false otherwise 15338 */ 15339 public void setActivated(boolean activated) { 15340 //noinspection DoubleNegation 15341 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 15342 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 15343 invalidate(true); 15344 refreshDrawableState(); 15345 dispatchSetActivated(activated); 15346 } 15347 } 15348 15349 /** 15350 * Dispatch setActivated to all of this View's children. 15351 * 15352 * @see #setActivated(boolean) 15353 * 15354 * @param activated The new activated state 15355 */ 15356 protected void dispatchSetActivated(boolean activated) { 15357 } 15358 15359 /** 15360 * Indicates the activation state of this view. 15361 * 15362 * @return true if the view is activated, false otherwise 15363 */ 15364 @ViewDebug.ExportedProperty 15365 public boolean isActivated() { 15366 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 15367 } 15368 15369 /** 15370 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 15371 * observer can be used to get notifications when global events, like 15372 * layout, happen. 15373 * 15374 * The returned ViewTreeObserver observer is not guaranteed to remain 15375 * valid for the lifetime of this View. If the caller of this method keeps 15376 * a long-lived reference to ViewTreeObserver, it should always check for 15377 * the return value of {@link ViewTreeObserver#isAlive()}. 15378 * 15379 * @return The ViewTreeObserver for this view's hierarchy. 15380 */ 15381 public ViewTreeObserver getViewTreeObserver() { 15382 if (mAttachInfo != null) { 15383 return mAttachInfo.mTreeObserver; 15384 } 15385 if (mFloatingTreeObserver == null) { 15386 mFloatingTreeObserver = new ViewTreeObserver(); 15387 } 15388 return mFloatingTreeObserver; 15389 } 15390 15391 /** 15392 * <p>Finds the topmost view in the current view hierarchy.</p> 15393 * 15394 * @return the topmost view containing this view 15395 */ 15396 public View getRootView() { 15397 if (mAttachInfo != null) { 15398 final View v = mAttachInfo.mRootView; 15399 if (v != null) { 15400 return v; 15401 } 15402 } 15403 15404 View parent = this; 15405 15406 while (parent.mParent != null && parent.mParent instanceof View) { 15407 parent = (View) parent.mParent; 15408 } 15409 15410 return parent; 15411 } 15412 15413 /** 15414 * <p>Computes the coordinates of this view on the screen. The argument 15415 * must be an array of two integers. After the method returns, the array 15416 * contains the x and y location in that order.</p> 15417 * 15418 * @param location an array of two integers in which to hold the coordinates 15419 */ 15420 public void getLocationOnScreen(int[] location) { 15421 getLocationInWindow(location); 15422 15423 final AttachInfo info = mAttachInfo; 15424 if (info != null) { 15425 location[0] += info.mWindowLeft; 15426 location[1] += info.mWindowTop; 15427 } 15428 } 15429 15430 /** 15431 * <p>Computes the coordinates of this view in its window. The argument 15432 * must be an array of two integers. After the method returns, the array 15433 * contains the x and y location in that order.</p> 15434 * 15435 * @param location an array of two integers in which to hold the coordinates 15436 */ 15437 public void getLocationInWindow(int[] location) { 15438 if (location == null || location.length < 2) { 15439 throw new IllegalArgumentException("location must be an array of two integers"); 15440 } 15441 15442 if (mAttachInfo == null) { 15443 // When the view is not attached to a window, this method does not make sense 15444 location[0] = location[1] = 0; 15445 return; 15446 } 15447 15448 float[] position = mAttachInfo.mTmpTransformLocation; 15449 position[0] = position[1] = 0.0f; 15450 15451 if (!hasIdentityMatrix()) { 15452 getMatrix().mapPoints(position); 15453 } 15454 15455 position[0] += mLeft; 15456 position[1] += mTop; 15457 15458 ViewParent viewParent = mParent; 15459 while (viewParent instanceof View) { 15460 final View view = (View) viewParent; 15461 15462 position[0] -= view.mScrollX; 15463 position[1] -= view.mScrollY; 15464 15465 if (!view.hasIdentityMatrix()) { 15466 view.getMatrix().mapPoints(position); 15467 } 15468 15469 position[0] += view.mLeft; 15470 position[1] += view.mTop; 15471 15472 viewParent = view.mParent; 15473 } 15474 15475 if (viewParent instanceof ViewRootImpl) { 15476 // *cough* 15477 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15478 position[1] -= vr.mCurScrollY; 15479 } 15480 15481 location[0] = (int) (position[0] + 0.5f); 15482 location[1] = (int) (position[1] + 0.5f); 15483 } 15484 15485 /** 15486 * {@hide} 15487 * @param id the id of the view to be found 15488 * @return the view of the specified id, null if cannot be found 15489 */ 15490 protected View findViewTraversal(int id) { 15491 if (id == mID) { 15492 return this; 15493 } 15494 return null; 15495 } 15496 15497 /** 15498 * {@hide} 15499 * @param tag the tag of the view to be found 15500 * @return the view of specified tag, null if cannot be found 15501 */ 15502 protected View findViewWithTagTraversal(Object tag) { 15503 if (tag != null && tag.equals(mTag)) { 15504 return this; 15505 } 15506 return null; 15507 } 15508 15509 /** 15510 * {@hide} 15511 * @param predicate The predicate to evaluate. 15512 * @param childToSkip If not null, ignores this child during the recursive traversal. 15513 * @return The first view that matches the predicate or null. 15514 */ 15515 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15516 if (predicate.apply(this)) { 15517 return this; 15518 } 15519 return null; 15520 } 15521 15522 /** 15523 * Look for a child view with the given id. If this view has the given 15524 * id, return this view. 15525 * 15526 * @param id The id to search for. 15527 * @return The view that has the given id in the hierarchy or null 15528 */ 15529 public final View findViewById(int id) { 15530 if (id < 0) { 15531 return null; 15532 } 15533 return findViewTraversal(id); 15534 } 15535 15536 /** 15537 * Finds a view by its unuque and stable accessibility id. 15538 * 15539 * @param accessibilityId The searched accessibility id. 15540 * @return The found view. 15541 */ 15542 final View findViewByAccessibilityId(int accessibilityId) { 15543 if (accessibilityId < 0) { 15544 return null; 15545 } 15546 return findViewByAccessibilityIdTraversal(accessibilityId); 15547 } 15548 15549 /** 15550 * Performs the traversal to find a view by its unuque and stable accessibility id. 15551 * 15552 * <strong>Note:</strong>This method does not stop at the root namespace 15553 * boundary since the user can touch the screen at an arbitrary location 15554 * potentially crossing the root namespace bounday which will send an 15555 * accessibility event to accessibility services and they should be able 15556 * to obtain the event source. Also accessibility ids are guaranteed to be 15557 * unique in the window. 15558 * 15559 * @param accessibilityId The accessibility id. 15560 * @return The found view. 15561 * 15562 * @hide 15563 */ 15564 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 15565 if (getAccessibilityViewId() == accessibilityId) { 15566 return this; 15567 } 15568 return null; 15569 } 15570 15571 /** 15572 * Look for a child view with the given tag. If this view has the given 15573 * tag, return this view. 15574 * 15575 * @param tag The tag to search for, using "tag.equals(getTag())". 15576 * @return The View that has the given tag in the hierarchy or null 15577 */ 15578 public final View findViewWithTag(Object tag) { 15579 if (tag == null) { 15580 return null; 15581 } 15582 return findViewWithTagTraversal(tag); 15583 } 15584 15585 /** 15586 * {@hide} 15587 * Look for a child view that matches the specified predicate. 15588 * If this view matches the predicate, return this view. 15589 * 15590 * @param predicate The predicate to evaluate. 15591 * @return The first view that matches the predicate or null. 15592 */ 15593 public final View findViewByPredicate(Predicate<View> predicate) { 15594 return findViewByPredicateTraversal(predicate, null); 15595 } 15596 15597 /** 15598 * {@hide} 15599 * Look for a child view that matches the specified predicate, 15600 * starting with the specified view and its descendents and then 15601 * recusively searching the ancestors and siblings of that view 15602 * until this view is reached. 15603 * 15604 * This method is useful in cases where the predicate does not match 15605 * a single unique view (perhaps multiple views use the same id) 15606 * and we are trying to find the view that is "closest" in scope to the 15607 * starting view. 15608 * 15609 * @param start The view to start from. 15610 * @param predicate The predicate to evaluate. 15611 * @return The first view that matches the predicate or null. 15612 */ 15613 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 15614 View childToSkip = null; 15615 for (;;) { 15616 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 15617 if (view != null || start == this) { 15618 return view; 15619 } 15620 15621 ViewParent parent = start.getParent(); 15622 if (parent == null || !(parent instanceof View)) { 15623 return null; 15624 } 15625 15626 childToSkip = start; 15627 start = (View) parent; 15628 } 15629 } 15630 15631 /** 15632 * Sets the identifier for this view. The identifier does not have to be 15633 * unique in this view's hierarchy. The identifier should be a positive 15634 * number. 15635 * 15636 * @see #NO_ID 15637 * @see #getId() 15638 * @see #findViewById(int) 15639 * 15640 * @param id a number used to identify the view 15641 * 15642 * @attr ref android.R.styleable#View_id 15643 */ 15644 public void setId(int id) { 15645 mID = id; 15646 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 15647 mID = generateViewId(); 15648 } 15649 } 15650 15651 /** 15652 * {@hide} 15653 * 15654 * @param isRoot true if the view belongs to the root namespace, false 15655 * otherwise 15656 */ 15657 public void setIsRootNamespace(boolean isRoot) { 15658 if (isRoot) { 15659 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 15660 } else { 15661 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 15662 } 15663 } 15664 15665 /** 15666 * {@hide} 15667 * 15668 * @return true if the view belongs to the root namespace, false otherwise 15669 */ 15670 public boolean isRootNamespace() { 15671 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 15672 } 15673 15674 /** 15675 * Returns this view's identifier. 15676 * 15677 * @return a positive integer used to identify the view or {@link #NO_ID} 15678 * if the view has no ID 15679 * 15680 * @see #setId(int) 15681 * @see #findViewById(int) 15682 * @attr ref android.R.styleable#View_id 15683 */ 15684 @ViewDebug.CapturedViewProperty 15685 public int getId() { 15686 return mID; 15687 } 15688 15689 /** 15690 * Returns this view's tag. 15691 * 15692 * @return the Object stored in this view as a tag 15693 * 15694 * @see #setTag(Object) 15695 * @see #getTag(int) 15696 */ 15697 @ViewDebug.ExportedProperty 15698 public Object getTag() { 15699 return mTag; 15700 } 15701 15702 /** 15703 * Sets the tag associated with this view. A tag can be used to mark 15704 * a view in its hierarchy and does not have to be unique within the 15705 * hierarchy. Tags can also be used to store data within a view without 15706 * resorting to another data structure. 15707 * 15708 * @param tag an Object to tag the view with 15709 * 15710 * @see #getTag() 15711 * @see #setTag(int, Object) 15712 */ 15713 public void setTag(final Object tag) { 15714 mTag = tag; 15715 } 15716 15717 /** 15718 * Returns the tag associated with this view and the specified key. 15719 * 15720 * @param key The key identifying the tag 15721 * 15722 * @return the Object stored in this view as a tag 15723 * 15724 * @see #setTag(int, Object) 15725 * @see #getTag() 15726 */ 15727 public Object getTag(int key) { 15728 if (mKeyedTags != null) return mKeyedTags.get(key); 15729 return null; 15730 } 15731 15732 /** 15733 * Sets a tag associated with this view and a key. A tag can be used 15734 * to mark a view in its hierarchy and does not have to be unique within 15735 * the hierarchy. Tags can also be used to store data within a view 15736 * without resorting to another data structure. 15737 * 15738 * The specified key should be an id declared in the resources of the 15739 * application to ensure it is unique (see the <a 15740 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 15741 * Keys identified as belonging to 15742 * the Android framework or not associated with any package will cause 15743 * an {@link IllegalArgumentException} to be thrown. 15744 * 15745 * @param key The key identifying the tag 15746 * @param tag An Object to tag the view with 15747 * 15748 * @throws IllegalArgumentException If they specified key is not valid 15749 * 15750 * @see #setTag(Object) 15751 * @see #getTag(int) 15752 */ 15753 public void setTag(int key, final Object tag) { 15754 // If the package id is 0x00 or 0x01, it's either an undefined package 15755 // or a framework id 15756 if ((key >>> 24) < 2) { 15757 throw new IllegalArgumentException("The key must be an application-specific " 15758 + "resource id."); 15759 } 15760 15761 setKeyedTag(key, tag); 15762 } 15763 15764 /** 15765 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 15766 * framework id. 15767 * 15768 * @hide 15769 */ 15770 public void setTagInternal(int key, Object tag) { 15771 if ((key >>> 24) != 0x1) { 15772 throw new IllegalArgumentException("The key must be a framework-specific " 15773 + "resource id."); 15774 } 15775 15776 setKeyedTag(key, tag); 15777 } 15778 15779 private void setKeyedTag(int key, Object tag) { 15780 if (mKeyedTags == null) { 15781 mKeyedTags = new SparseArray<Object>(2); 15782 } 15783 15784 mKeyedTags.put(key, tag); 15785 } 15786 15787 /** 15788 * Prints information about this view in the log output, with the tag 15789 * {@link #VIEW_LOG_TAG}. 15790 * 15791 * @hide 15792 */ 15793 public void debug() { 15794 debug(0); 15795 } 15796 15797 /** 15798 * Prints information about this view in the log output, with the tag 15799 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 15800 * indentation defined by the <code>depth</code>. 15801 * 15802 * @param depth the indentation level 15803 * 15804 * @hide 15805 */ 15806 protected void debug(int depth) { 15807 String output = debugIndent(depth - 1); 15808 15809 output += "+ " + this; 15810 int id = getId(); 15811 if (id != -1) { 15812 output += " (id=" + id + ")"; 15813 } 15814 Object tag = getTag(); 15815 if (tag != null) { 15816 output += " (tag=" + tag + ")"; 15817 } 15818 Log.d(VIEW_LOG_TAG, output); 15819 15820 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 15821 output = debugIndent(depth) + " FOCUSED"; 15822 Log.d(VIEW_LOG_TAG, output); 15823 } 15824 15825 output = debugIndent(depth); 15826 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 15827 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 15828 + "} "; 15829 Log.d(VIEW_LOG_TAG, output); 15830 15831 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 15832 || mPaddingBottom != 0) { 15833 output = debugIndent(depth); 15834 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 15835 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 15836 Log.d(VIEW_LOG_TAG, output); 15837 } 15838 15839 output = debugIndent(depth); 15840 output += "mMeasureWidth=" + mMeasuredWidth + 15841 " mMeasureHeight=" + mMeasuredHeight; 15842 Log.d(VIEW_LOG_TAG, output); 15843 15844 output = debugIndent(depth); 15845 if (mLayoutParams == null) { 15846 output += "BAD! no layout params"; 15847 } else { 15848 output = mLayoutParams.debug(output); 15849 } 15850 Log.d(VIEW_LOG_TAG, output); 15851 15852 output = debugIndent(depth); 15853 output += "flags={"; 15854 output += View.printFlags(mViewFlags); 15855 output += "}"; 15856 Log.d(VIEW_LOG_TAG, output); 15857 15858 output = debugIndent(depth); 15859 output += "privateFlags={"; 15860 output += View.printPrivateFlags(mPrivateFlags); 15861 output += "}"; 15862 Log.d(VIEW_LOG_TAG, output); 15863 } 15864 15865 /** 15866 * Creates a string of whitespaces used for indentation. 15867 * 15868 * @param depth the indentation level 15869 * @return a String containing (depth * 2 + 3) * 2 white spaces 15870 * 15871 * @hide 15872 */ 15873 protected static String debugIndent(int depth) { 15874 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 15875 for (int i = 0; i < (depth * 2) + 3; i++) { 15876 spaces.append(' ').append(' '); 15877 } 15878 return spaces.toString(); 15879 } 15880 15881 /** 15882 * <p>Return the offset of the widget's text baseline from the widget's top 15883 * boundary. If this widget does not support baseline alignment, this 15884 * method returns -1. </p> 15885 * 15886 * @return the offset of the baseline within the widget's bounds or -1 15887 * if baseline alignment is not supported 15888 */ 15889 @ViewDebug.ExportedProperty(category = "layout") 15890 public int getBaseline() { 15891 return -1; 15892 } 15893 15894 /** 15895 * Returns whether the view hierarchy is currently undergoing a layout pass. This 15896 * information is useful to avoid situations such as calling {@link #requestLayout()} during 15897 * a layout pass. 15898 * 15899 * @return whether the view hierarchy is currently undergoing a layout pass 15900 */ 15901 public boolean isInLayout() { 15902 ViewRootImpl viewRoot = getViewRootImpl(); 15903 return (viewRoot != null && viewRoot.isInLayout()); 15904 } 15905 15906 /** 15907 * Call this when something has changed which has invalidated the 15908 * layout of this view. This will schedule a layout pass of the view 15909 * tree. This should not be called while the view hierarchy is currently in a layout 15910 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 15911 * end of the current layout pass (and then layout will run again) or after the current 15912 * frame is drawn and the next layout occurs. 15913 * 15914 * <p>Subclasses which override this method should call the superclass method to 15915 * handle possible request-during-layout errors correctly.</p> 15916 */ 15917 public void requestLayout() { 15918 if (mMeasureCache != null) mMeasureCache.clear(); 15919 15920 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 15921 // Only trigger request-during-layout logic if this is the view requesting it, 15922 // not the views in its parent hierarchy 15923 ViewRootImpl viewRoot = getViewRootImpl(); 15924 if (viewRoot != null && viewRoot.isInLayout()) { 15925 if (!viewRoot.requestLayoutDuringLayout(this)) { 15926 return; 15927 } 15928 } 15929 mAttachInfo.mViewRequestingLayout = this; 15930 } 15931 15932 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15933 mPrivateFlags |= PFLAG_INVALIDATED; 15934 15935 if (mParent != null && !mParent.isLayoutRequested()) { 15936 mParent.requestLayout(); 15937 } 15938 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 15939 mAttachInfo.mViewRequestingLayout = null; 15940 } 15941 } 15942 15943 /** 15944 * Forces this view to be laid out during the next layout pass. 15945 * This method does not call requestLayout() or forceLayout() 15946 * on the parent. 15947 */ 15948 public void forceLayout() { 15949 if (mMeasureCache != null) mMeasureCache.clear(); 15950 15951 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15952 mPrivateFlags |= PFLAG_INVALIDATED; 15953 } 15954 15955 /** 15956 * <p> 15957 * This is called to find out how big a view should be. The parent 15958 * supplies constraint information in the width and height parameters. 15959 * </p> 15960 * 15961 * <p> 15962 * The actual measurement work of a view is performed in 15963 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 15964 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 15965 * </p> 15966 * 15967 * 15968 * @param widthMeasureSpec Horizontal space requirements as imposed by the 15969 * parent 15970 * @param heightMeasureSpec Vertical space requirements as imposed by the 15971 * parent 15972 * 15973 * @see #onMeasure(int, int) 15974 */ 15975 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 15976 boolean optical = isLayoutModeOptical(this); 15977 if (optical != isLayoutModeOptical(mParent)) { 15978 Insets insets = getOpticalInsets(); 15979 int oWidth = insets.left + insets.right; 15980 int oHeight = insets.top + insets.bottom; 15981 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 15982 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 15983 } 15984 15985 // Suppress sign extension for the low bytes 15986 long key = (long) widthMeasureSpec << 32 | (long) heightMeasureSpec & 0xffffffffL; 15987 if (mMeasureCache == null) mMeasureCache = new LongSparseLongArray(2); 15988 15989 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 15990 widthMeasureSpec != mOldWidthMeasureSpec || 15991 heightMeasureSpec != mOldHeightMeasureSpec) { 15992 15993 // first clears the measured dimension flag 15994 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 15995 15996 resolveRtlPropertiesIfNeeded(); 15997 15998 int cacheIndex = mMeasureCache.indexOfKey(key); 15999 if (cacheIndex < 0) { 16000 // measure ourselves, this should set the measured dimension flag back 16001 onMeasure(widthMeasureSpec, heightMeasureSpec); 16002 mPrivateFlags3 &= ~PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16003 } else { 16004 long value = mMeasureCache.valueAt(cacheIndex); 16005 // Casting a long to int drops the high 32 bits, no mask needed 16006 setMeasuredDimension((int) (value >> 32), (int) value); 16007 mPrivateFlags3 |= PFLAG3_MEASURE_NEEDED_BEFORE_LAYOUT; 16008 } 16009 16010 // flag not set, setMeasuredDimension() was not invoked, we raise 16011 // an exception to warn the developer 16012 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 16013 throw new IllegalStateException("onMeasure() did not set the" 16014 + " measured dimension by calling" 16015 + " setMeasuredDimension()"); 16016 } 16017 16018 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 16019 } 16020 16021 mOldWidthMeasureSpec = widthMeasureSpec; 16022 mOldHeightMeasureSpec = heightMeasureSpec; 16023 16024 mMeasureCache.put(key, ((long) mMeasuredWidth) << 32 | 16025 (long) mMeasuredHeight & 0xffffffffL); // suppress sign extension 16026 } 16027 16028 /** 16029 * <p> 16030 * Measure the view and its content to determine the measured width and the 16031 * measured height. This method is invoked by {@link #measure(int, int)} and 16032 * should be overriden by subclasses to provide accurate and efficient 16033 * measurement of their contents. 16034 * </p> 16035 * 16036 * <p> 16037 * <strong>CONTRACT:</strong> When overriding this method, you 16038 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 16039 * measured width and height of this view. Failure to do so will trigger an 16040 * <code>IllegalStateException</code>, thrown by 16041 * {@link #measure(int, int)}. Calling the superclass' 16042 * {@link #onMeasure(int, int)} is a valid use. 16043 * </p> 16044 * 16045 * <p> 16046 * The base class implementation of measure defaults to the background size, 16047 * unless a larger size is allowed by the MeasureSpec. Subclasses should 16048 * override {@link #onMeasure(int, int)} to provide better measurements of 16049 * their content. 16050 * </p> 16051 * 16052 * <p> 16053 * If this method is overridden, it is the subclass's responsibility to make 16054 * sure the measured height and width are at least the view's minimum height 16055 * and width ({@link #getSuggestedMinimumHeight()} and 16056 * {@link #getSuggestedMinimumWidth()}). 16057 * </p> 16058 * 16059 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 16060 * The requirements are encoded with 16061 * {@link android.view.View.MeasureSpec}. 16062 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 16063 * The requirements are encoded with 16064 * {@link android.view.View.MeasureSpec}. 16065 * 16066 * @see #getMeasuredWidth() 16067 * @see #getMeasuredHeight() 16068 * @see #setMeasuredDimension(int, int) 16069 * @see #getSuggestedMinimumHeight() 16070 * @see #getSuggestedMinimumWidth() 16071 * @see android.view.View.MeasureSpec#getMode(int) 16072 * @see android.view.View.MeasureSpec#getSize(int) 16073 */ 16074 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 16075 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 16076 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 16077 } 16078 16079 /** 16080 * <p>This method must be called by {@link #onMeasure(int, int)} to store the 16081 * measured width and measured height. Failing to do so will trigger an 16082 * exception at measurement time.</p> 16083 * 16084 * @param measuredWidth The measured width of this view. May be a complex 16085 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16086 * {@link #MEASURED_STATE_TOO_SMALL}. 16087 * @param measuredHeight The measured height of this view. May be a complex 16088 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 16089 * {@link #MEASURED_STATE_TOO_SMALL}. 16090 */ 16091 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 16092 boolean optical = isLayoutModeOptical(this); 16093 if (optical != isLayoutModeOptical(mParent)) { 16094 Insets insets = getOpticalInsets(); 16095 int opticalWidth = insets.left + insets.right; 16096 int opticalHeight = insets.top + insets.bottom; 16097 16098 measuredWidth += optical ? opticalWidth : -opticalWidth; 16099 measuredHeight += optical ? opticalHeight : -opticalHeight; 16100 } 16101 mMeasuredWidth = measuredWidth; 16102 mMeasuredHeight = measuredHeight; 16103 16104 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 16105 } 16106 16107 /** 16108 * Merge two states as returned by {@link #getMeasuredState()}. 16109 * @param curState The current state as returned from a view or the result 16110 * of combining multiple views. 16111 * @param newState The new view state to combine. 16112 * @return Returns a new integer reflecting the combination of the two 16113 * states. 16114 */ 16115 public static int combineMeasuredStates(int curState, int newState) { 16116 return curState | newState; 16117 } 16118 16119 /** 16120 * Version of {@link #resolveSizeAndState(int, int, int)} 16121 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 16122 */ 16123 public static int resolveSize(int size, int measureSpec) { 16124 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 16125 } 16126 16127 /** 16128 * Utility to reconcile a desired size and state, with constraints imposed 16129 * by a MeasureSpec. Will take the desired size, unless a different size 16130 * is imposed by the constraints. The returned value is a compound integer, 16131 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 16132 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 16133 * size is smaller than the size the view wants to be. 16134 * 16135 * @param size How big the view wants to be 16136 * @param measureSpec Constraints imposed by the parent 16137 * @return Size information bit mask as defined by 16138 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 16139 */ 16140 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 16141 int result = size; 16142 int specMode = MeasureSpec.getMode(measureSpec); 16143 int specSize = MeasureSpec.getSize(measureSpec); 16144 switch (specMode) { 16145 case MeasureSpec.UNSPECIFIED: 16146 result = size; 16147 break; 16148 case MeasureSpec.AT_MOST: 16149 if (specSize < size) { 16150 result = specSize | MEASURED_STATE_TOO_SMALL; 16151 } else { 16152 result = size; 16153 } 16154 break; 16155 case MeasureSpec.EXACTLY: 16156 result = specSize; 16157 break; 16158 } 16159 return result | (childMeasuredState&MEASURED_STATE_MASK); 16160 } 16161 16162 /** 16163 * Utility to return a default size. Uses the supplied size if the 16164 * MeasureSpec imposed no constraints. Will get larger if allowed 16165 * by the MeasureSpec. 16166 * 16167 * @param size Default size for this view 16168 * @param measureSpec Constraints imposed by the parent 16169 * @return The size this view should be. 16170 */ 16171 public static int getDefaultSize(int size, int measureSpec) { 16172 int result = size; 16173 int specMode = MeasureSpec.getMode(measureSpec); 16174 int specSize = MeasureSpec.getSize(measureSpec); 16175 16176 switch (specMode) { 16177 case MeasureSpec.UNSPECIFIED: 16178 result = size; 16179 break; 16180 case MeasureSpec.AT_MOST: 16181 case MeasureSpec.EXACTLY: 16182 result = specSize; 16183 break; 16184 } 16185 return result; 16186 } 16187 16188 /** 16189 * Returns the suggested minimum height that the view should use. This 16190 * returns the maximum of the view's minimum height 16191 * and the background's minimum height 16192 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 16193 * <p> 16194 * When being used in {@link #onMeasure(int, int)}, the caller should still 16195 * ensure the returned height is within the requirements of the parent. 16196 * 16197 * @return The suggested minimum height of the view. 16198 */ 16199 protected int getSuggestedMinimumHeight() { 16200 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 16201 16202 } 16203 16204 /** 16205 * Returns the suggested minimum width that the view should use. This 16206 * returns the maximum of the view's minimum width) 16207 * and the background's minimum width 16208 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 16209 * <p> 16210 * When being used in {@link #onMeasure(int, int)}, the caller should still 16211 * ensure the returned width is within the requirements of the parent. 16212 * 16213 * @return The suggested minimum width of the view. 16214 */ 16215 protected int getSuggestedMinimumWidth() { 16216 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 16217 } 16218 16219 /** 16220 * Returns the minimum height of the view. 16221 * 16222 * @return the minimum height the view will try to be. 16223 * 16224 * @see #setMinimumHeight(int) 16225 * 16226 * @attr ref android.R.styleable#View_minHeight 16227 */ 16228 public int getMinimumHeight() { 16229 return mMinHeight; 16230 } 16231 16232 /** 16233 * Sets the minimum height of the view. It is not guaranteed the view will 16234 * be able to achieve this minimum height (for example, if its parent layout 16235 * constrains it with less available height). 16236 * 16237 * @param minHeight The minimum height the view will try to be. 16238 * 16239 * @see #getMinimumHeight() 16240 * 16241 * @attr ref android.R.styleable#View_minHeight 16242 */ 16243 public void setMinimumHeight(int minHeight) { 16244 mMinHeight = minHeight; 16245 requestLayout(); 16246 } 16247 16248 /** 16249 * Returns the minimum width of the view. 16250 * 16251 * @return the minimum width the view will try to be. 16252 * 16253 * @see #setMinimumWidth(int) 16254 * 16255 * @attr ref android.R.styleable#View_minWidth 16256 */ 16257 public int getMinimumWidth() { 16258 return mMinWidth; 16259 } 16260 16261 /** 16262 * Sets the minimum width of the view. It is not guaranteed the view will 16263 * be able to achieve this minimum width (for example, if its parent layout 16264 * constrains it with less available width). 16265 * 16266 * @param minWidth The minimum width the view will try to be. 16267 * 16268 * @see #getMinimumWidth() 16269 * 16270 * @attr ref android.R.styleable#View_minWidth 16271 */ 16272 public void setMinimumWidth(int minWidth) { 16273 mMinWidth = minWidth; 16274 requestLayout(); 16275 16276 } 16277 16278 /** 16279 * Get the animation currently associated with this view. 16280 * 16281 * @return The animation that is currently playing or 16282 * scheduled to play for this view. 16283 */ 16284 public Animation getAnimation() { 16285 return mCurrentAnimation; 16286 } 16287 16288 /** 16289 * Start the specified animation now. 16290 * 16291 * @param animation the animation to start now 16292 */ 16293 public void startAnimation(Animation animation) { 16294 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 16295 setAnimation(animation); 16296 invalidateParentCaches(); 16297 invalidate(true); 16298 } 16299 16300 /** 16301 * Cancels any animations for this view. 16302 */ 16303 public void clearAnimation() { 16304 if (mCurrentAnimation != null) { 16305 mCurrentAnimation.detach(); 16306 } 16307 mCurrentAnimation = null; 16308 invalidateParentIfNeeded(); 16309 } 16310 16311 /** 16312 * Sets the next animation to play for this view. 16313 * If you want the animation to play immediately, use 16314 * {@link #startAnimation(android.view.animation.Animation)} instead. 16315 * This method provides allows fine-grained 16316 * control over the start time and invalidation, but you 16317 * must make sure that 1) the animation has a start time set, and 16318 * 2) the view's parent (which controls animations on its children) 16319 * will be invalidated when the animation is supposed to 16320 * start. 16321 * 16322 * @param animation The next animation, or null. 16323 */ 16324 public void setAnimation(Animation animation) { 16325 mCurrentAnimation = animation; 16326 16327 if (animation != null) { 16328 // If the screen is off assume the animation start time is now instead of 16329 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 16330 // would cause the animation to start when the screen turns back on 16331 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 16332 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 16333 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 16334 } 16335 animation.reset(); 16336 } 16337 } 16338 16339 /** 16340 * Invoked by a parent ViewGroup to notify the start of the animation 16341 * currently associated with this view. If you override this method, 16342 * always call super.onAnimationStart(); 16343 * 16344 * @see #setAnimation(android.view.animation.Animation) 16345 * @see #getAnimation() 16346 */ 16347 protected void onAnimationStart() { 16348 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 16349 } 16350 16351 /** 16352 * Invoked by a parent ViewGroup to notify the end of the animation 16353 * currently associated with this view. If you override this method, 16354 * always call super.onAnimationEnd(); 16355 * 16356 * @see #setAnimation(android.view.animation.Animation) 16357 * @see #getAnimation() 16358 */ 16359 protected void onAnimationEnd() { 16360 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 16361 } 16362 16363 /** 16364 * Invoked if there is a Transform that involves alpha. Subclass that can 16365 * draw themselves with the specified alpha should return true, and then 16366 * respect that alpha when their onDraw() is called. If this returns false 16367 * then the view may be redirected to draw into an offscreen buffer to 16368 * fulfill the request, which will look fine, but may be slower than if the 16369 * subclass handles it internally. The default implementation returns false. 16370 * 16371 * @param alpha The alpha (0..255) to apply to the view's drawing 16372 * @return true if the view can draw with the specified alpha. 16373 */ 16374 protected boolean onSetAlpha(int alpha) { 16375 return false; 16376 } 16377 16378 /** 16379 * This is used by the RootView to perform an optimization when 16380 * the view hierarchy contains one or several SurfaceView. 16381 * SurfaceView is always considered transparent, but its children are not, 16382 * therefore all View objects remove themselves from the global transparent 16383 * region (passed as a parameter to this function). 16384 * 16385 * @param region The transparent region for this ViewAncestor (window). 16386 * 16387 * @return Returns true if the effective visibility of the view at this 16388 * point is opaque, regardless of the transparent region; returns false 16389 * if it is possible for underlying windows to be seen behind the view. 16390 * 16391 * {@hide} 16392 */ 16393 public boolean gatherTransparentRegion(Region region) { 16394 final AttachInfo attachInfo = mAttachInfo; 16395 if (region != null && attachInfo != null) { 16396 final int pflags = mPrivateFlags; 16397 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 16398 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 16399 // remove it from the transparent region. 16400 final int[] location = attachInfo.mTransparentLocation; 16401 getLocationInWindow(location); 16402 region.op(location[0], location[1], location[0] + mRight - mLeft, 16403 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 16404 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 16405 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 16406 // exists, so we remove the background drawable's non-transparent 16407 // parts from this transparent region. 16408 applyDrawableToTransparentRegion(mBackground, region); 16409 } 16410 } 16411 return true; 16412 } 16413 16414 /** 16415 * Play a sound effect for this view. 16416 * 16417 * <p>The framework will play sound effects for some built in actions, such as 16418 * clicking, but you may wish to play these effects in your widget, 16419 * for instance, for internal navigation. 16420 * 16421 * <p>The sound effect will only be played if sound effects are enabled by the user, and 16422 * {@link #isSoundEffectsEnabled()} is true. 16423 * 16424 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 16425 */ 16426 public void playSoundEffect(int soundConstant) { 16427 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 16428 return; 16429 } 16430 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 16431 } 16432 16433 /** 16434 * BZZZTT!!1! 16435 * 16436 * <p>Provide haptic feedback to the user for this view. 16437 * 16438 * <p>The framework will provide haptic feedback for some built in actions, 16439 * such as long presses, but you may wish to provide feedback for your 16440 * own widget. 16441 * 16442 * <p>The feedback will only be performed if 16443 * {@link #isHapticFeedbackEnabled()} is true. 16444 * 16445 * @param feedbackConstant One of the constants defined in 16446 * {@link HapticFeedbackConstants} 16447 */ 16448 public boolean performHapticFeedback(int feedbackConstant) { 16449 return performHapticFeedback(feedbackConstant, 0); 16450 } 16451 16452 /** 16453 * BZZZTT!!1! 16454 * 16455 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 16456 * 16457 * @param feedbackConstant One of the constants defined in 16458 * {@link HapticFeedbackConstants} 16459 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 16460 */ 16461 public boolean performHapticFeedback(int feedbackConstant, int flags) { 16462 if (mAttachInfo == null) { 16463 return false; 16464 } 16465 //noinspection SimplifiableIfStatement 16466 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 16467 && !isHapticFeedbackEnabled()) { 16468 return false; 16469 } 16470 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 16471 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 16472 } 16473 16474 /** 16475 * Request that the visibility of the status bar or other screen/window 16476 * decorations be changed. 16477 * 16478 * <p>This method is used to put the over device UI into temporary modes 16479 * where the user's attention is focused more on the application content, 16480 * by dimming or hiding surrounding system affordances. This is typically 16481 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16482 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16483 * to be placed behind the action bar (and with these flags other system 16484 * affordances) so that smooth transitions between hiding and showing them 16485 * can be done. 16486 * 16487 * <p>Two representative examples of the use of system UI visibility is 16488 * implementing a content browsing application (like a magazine reader) 16489 * and a video playing application. 16490 * 16491 * <p>The first code shows a typical implementation of a View in a content 16492 * browsing application. In this implementation, the application goes 16493 * into a content-oriented mode by hiding the status bar and action bar, 16494 * and putting the navigation elements into lights out mode. The user can 16495 * then interact with content while in this mode. Such an application should 16496 * provide an easy way for the user to toggle out of the mode (such as to 16497 * check information in the status bar or access notifications). In the 16498 * implementation here, this is done simply by tapping on the content. 16499 * 16500 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16501 * content} 16502 * 16503 * <p>This second code sample shows a typical implementation of a View 16504 * in a video playing application. In this situation, while the video is 16505 * playing the application would like to go into a complete full-screen mode, 16506 * to use as much of the display as possible for the video. When in this state 16507 * the user can not interact with the application; the system intercepts 16508 * touching on the screen to pop the UI out of full screen mode. See 16509 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16510 * 16511 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16512 * content} 16513 * 16514 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16515 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16516 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16517 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16518 */ 16519 public void setSystemUiVisibility(int visibility) { 16520 if (visibility != mSystemUiVisibility) { 16521 mSystemUiVisibility = visibility; 16522 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16523 mParent.recomputeViewAttributes(this); 16524 } 16525 } 16526 } 16527 16528 /** 16529 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 16530 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16531 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16532 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16533 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16534 */ 16535 public int getSystemUiVisibility() { 16536 return mSystemUiVisibility; 16537 } 16538 16539 /** 16540 * Returns the current system UI visibility that is currently set for 16541 * the entire window. This is the combination of the 16542 * {@link #setSystemUiVisibility(int)} values supplied by all of the 16543 * views in the window. 16544 */ 16545 public int getWindowSystemUiVisibility() { 16546 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 16547 } 16548 16549 /** 16550 * Override to find out when the window's requested system UI visibility 16551 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 16552 * This is different from the callbacks received through 16553 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 16554 * in that this is only telling you about the local request of the window, 16555 * not the actual values applied by the system. 16556 */ 16557 public void onWindowSystemUiVisibilityChanged(int visible) { 16558 } 16559 16560 /** 16561 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 16562 * the view hierarchy. 16563 */ 16564 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 16565 onWindowSystemUiVisibilityChanged(visible); 16566 } 16567 16568 /** 16569 * Set a listener to receive callbacks when the visibility of the system bar changes. 16570 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 16571 */ 16572 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 16573 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 16574 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16575 mParent.recomputeViewAttributes(this); 16576 } 16577 } 16578 16579 /** 16580 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 16581 * the view hierarchy. 16582 */ 16583 public void dispatchSystemUiVisibilityChanged(int visibility) { 16584 ListenerInfo li = mListenerInfo; 16585 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 16586 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 16587 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 16588 } 16589 } 16590 16591 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 16592 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 16593 if (val != mSystemUiVisibility) { 16594 setSystemUiVisibility(val); 16595 return true; 16596 } 16597 return false; 16598 } 16599 16600 /** @hide */ 16601 public void setDisabledSystemUiVisibility(int flags) { 16602 if (mAttachInfo != null) { 16603 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 16604 mAttachInfo.mDisabledSystemUiVisibility = flags; 16605 if (mParent != null) { 16606 mParent.recomputeViewAttributes(this); 16607 } 16608 } 16609 } 16610 } 16611 16612 /** 16613 * Creates an image that the system displays during the drag and drop 16614 * operation. This is called a "drag shadow". The default implementation 16615 * for a DragShadowBuilder based on a View returns an image that has exactly the same 16616 * appearance as the given View. The default also positions the center of the drag shadow 16617 * directly under the touch point. If no View is provided (the constructor with no parameters 16618 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 16619 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 16620 * default is an invisible drag shadow. 16621 * <p> 16622 * You are not required to use the View you provide to the constructor as the basis of the 16623 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 16624 * anything you want as the drag shadow. 16625 * </p> 16626 * <p> 16627 * You pass a DragShadowBuilder object to the system when you start the drag. The system 16628 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 16629 * size and position of the drag shadow. It uses this data to construct a 16630 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 16631 * so that your application can draw the shadow image in the Canvas. 16632 * </p> 16633 * 16634 * <div class="special reference"> 16635 * <h3>Developer Guides</h3> 16636 * <p>For a guide to implementing drag and drop features, read the 16637 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16638 * </div> 16639 */ 16640 public static class DragShadowBuilder { 16641 private final WeakReference<View> mView; 16642 16643 /** 16644 * Constructs a shadow image builder based on a View. By default, the resulting drag 16645 * shadow will have the same appearance and dimensions as the View, with the touch point 16646 * over the center of the View. 16647 * @param view A View. Any View in scope can be used. 16648 */ 16649 public DragShadowBuilder(View view) { 16650 mView = new WeakReference<View>(view); 16651 } 16652 16653 /** 16654 * Construct a shadow builder object with no associated View. This 16655 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 16656 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 16657 * to supply the drag shadow's dimensions and appearance without 16658 * reference to any View object. If they are not overridden, then the result is an 16659 * invisible drag shadow. 16660 */ 16661 public DragShadowBuilder() { 16662 mView = new WeakReference<View>(null); 16663 } 16664 16665 /** 16666 * Returns the View object that had been passed to the 16667 * {@link #View.DragShadowBuilder(View)} 16668 * constructor. If that View parameter was {@code null} or if the 16669 * {@link #View.DragShadowBuilder()} 16670 * constructor was used to instantiate the builder object, this method will return 16671 * null. 16672 * 16673 * @return The View object associate with this builder object. 16674 */ 16675 @SuppressWarnings({"JavadocReference"}) 16676 final public View getView() { 16677 return mView.get(); 16678 } 16679 16680 /** 16681 * Provides the metrics for the shadow image. These include the dimensions of 16682 * the shadow image, and the point within that shadow that should 16683 * be centered under the touch location while dragging. 16684 * <p> 16685 * The default implementation sets the dimensions of the shadow to be the 16686 * same as the dimensions of the View itself and centers the shadow under 16687 * the touch point. 16688 * </p> 16689 * 16690 * @param shadowSize A {@link android.graphics.Point} containing the width and height 16691 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 16692 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 16693 * image. 16694 * 16695 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 16696 * shadow image that should be underneath the touch point during the drag and drop 16697 * operation. Your application must set {@link android.graphics.Point#x} to the 16698 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 16699 */ 16700 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 16701 final View view = mView.get(); 16702 if (view != null) { 16703 shadowSize.set(view.getWidth(), view.getHeight()); 16704 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 16705 } else { 16706 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 16707 } 16708 } 16709 16710 /** 16711 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 16712 * based on the dimensions it received from the 16713 * {@link #onProvideShadowMetrics(Point, Point)} callback. 16714 * 16715 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 16716 */ 16717 public void onDrawShadow(Canvas canvas) { 16718 final View view = mView.get(); 16719 if (view != null) { 16720 view.draw(canvas); 16721 } else { 16722 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 16723 } 16724 } 16725 } 16726 16727 /** 16728 * Starts a drag and drop operation. When your application calls this method, it passes a 16729 * {@link android.view.View.DragShadowBuilder} object to the system. The 16730 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 16731 * to get metrics for the drag shadow, and then calls the object's 16732 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 16733 * <p> 16734 * Once the system has the drag shadow, it begins the drag and drop operation by sending 16735 * drag events to all the View objects in your application that are currently visible. It does 16736 * this either by calling the View object's drag listener (an implementation of 16737 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 16738 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 16739 * Both are passed a {@link android.view.DragEvent} object that has a 16740 * {@link android.view.DragEvent#getAction()} value of 16741 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 16742 * </p> 16743 * <p> 16744 * Your application can invoke startDrag() on any attached View object. The View object does not 16745 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 16746 * be related to the View the user selected for dragging. 16747 * </p> 16748 * @param data A {@link android.content.ClipData} object pointing to the data to be 16749 * transferred by the drag and drop operation. 16750 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 16751 * drag shadow. 16752 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 16753 * drop operation. This Object is put into every DragEvent object sent by the system during the 16754 * current drag. 16755 * <p> 16756 * myLocalState is a lightweight mechanism for the sending information from the dragged View 16757 * to the target Views. For example, it can contain flags that differentiate between a 16758 * a copy operation and a move operation. 16759 * </p> 16760 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 16761 * so the parameter should be set to 0. 16762 * @return {@code true} if the method completes successfully, or 16763 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 16764 * do a drag, and so no drag operation is in progress. 16765 */ 16766 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 16767 Object myLocalState, int flags) { 16768 if (ViewDebug.DEBUG_DRAG) { 16769 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 16770 } 16771 boolean okay = false; 16772 16773 Point shadowSize = new Point(); 16774 Point shadowTouchPoint = new Point(); 16775 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 16776 16777 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 16778 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 16779 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 16780 } 16781 16782 if (ViewDebug.DEBUG_DRAG) { 16783 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 16784 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 16785 } 16786 Surface surface = new Surface(); 16787 try { 16788 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 16789 flags, shadowSize.x, shadowSize.y, surface); 16790 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 16791 + " surface=" + surface); 16792 if (token != null) { 16793 Canvas canvas = surface.lockCanvas(null); 16794 try { 16795 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 16796 shadowBuilder.onDrawShadow(canvas); 16797 } finally { 16798 surface.unlockCanvasAndPost(canvas); 16799 } 16800 16801 final ViewRootImpl root = getViewRootImpl(); 16802 16803 // Cache the local state object for delivery with DragEvents 16804 root.setLocalDragState(myLocalState); 16805 16806 // repurpose 'shadowSize' for the last touch point 16807 root.getLastTouchPoint(shadowSize); 16808 16809 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 16810 shadowSize.x, shadowSize.y, 16811 shadowTouchPoint.x, shadowTouchPoint.y, data); 16812 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 16813 16814 // Off and running! Release our local surface instance; the drag 16815 // shadow surface is now managed by the system process. 16816 surface.release(); 16817 } 16818 } catch (Exception e) { 16819 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 16820 surface.destroy(); 16821 } 16822 16823 return okay; 16824 } 16825 16826 /** 16827 * Handles drag events sent by the system following a call to 16828 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 16829 *<p> 16830 * When the system calls this method, it passes a 16831 * {@link android.view.DragEvent} object. A call to 16832 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 16833 * in DragEvent. The method uses these to determine what is happening in the drag and drop 16834 * operation. 16835 * @param event The {@link android.view.DragEvent} sent by the system. 16836 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 16837 * in DragEvent, indicating the type of drag event represented by this object. 16838 * @return {@code true} if the method was successful, otherwise {@code false}. 16839 * <p> 16840 * The method should return {@code true} in response to an action type of 16841 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 16842 * operation. 16843 * </p> 16844 * <p> 16845 * The method should also return {@code true} in response to an action type of 16846 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 16847 * {@code false} if it didn't. 16848 * </p> 16849 */ 16850 public boolean onDragEvent(DragEvent event) { 16851 return false; 16852 } 16853 16854 /** 16855 * Detects if this View is enabled and has a drag event listener. 16856 * If both are true, then it calls the drag event listener with the 16857 * {@link android.view.DragEvent} it received. If the drag event listener returns 16858 * {@code true}, then dispatchDragEvent() returns {@code true}. 16859 * <p> 16860 * For all other cases, the method calls the 16861 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 16862 * method and returns its result. 16863 * </p> 16864 * <p> 16865 * This ensures that a drag event is always consumed, even if the View does not have a drag 16866 * event listener. However, if the View has a listener and the listener returns true, then 16867 * onDragEvent() is not called. 16868 * </p> 16869 */ 16870 public boolean dispatchDragEvent(DragEvent event) { 16871 ListenerInfo li = mListenerInfo; 16872 //noinspection SimplifiableIfStatement 16873 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 16874 && li.mOnDragListener.onDrag(this, event)) { 16875 return true; 16876 } 16877 return onDragEvent(event); 16878 } 16879 16880 boolean canAcceptDrag() { 16881 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 16882 } 16883 16884 /** 16885 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 16886 * it is ever exposed at all. 16887 * @hide 16888 */ 16889 public void onCloseSystemDialogs(String reason) { 16890 } 16891 16892 /** 16893 * Given a Drawable whose bounds have been set to draw into this view, 16894 * update a Region being computed for 16895 * {@link #gatherTransparentRegion(android.graphics.Region)} so 16896 * that any non-transparent parts of the Drawable are removed from the 16897 * given transparent region. 16898 * 16899 * @param dr The Drawable whose transparency is to be applied to the region. 16900 * @param region A Region holding the current transparency information, 16901 * where any parts of the region that are set are considered to be 16902 * transparent. On return, this region will be modified to have the 16903 * transparency information reduced by the corresponding parts of the 16904 * Drawable that are not transparent. 16905 * {@hide} 16906 */ 16907 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 16908 if (DBG) { 16909 Log.i("View", "Getting transparent region for: " + this); 16910 } 16911 final Region r = dr.getTransparentRegion(); 16912 final Rect db = dr.getBounds(); 16913 final AttachInfo attachInfo = mAttachInfo; 16914 if (r != null && attachInfo != null) { 16915 final int w = getRight()-getLeft(); 16916 final int h = getBottom()-getTop(); 16917 if (db.left > 0) { 16918 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 16919 r.op(0, 0, db.left, h, Region.Op.UNION); 16920 } 16921 if (db.right < w) { 16922 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 16923 r.op(db.right, 0, w, h, Region.Op.UNION); 16924 } 16925 if (db.top > 0) { 16926 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 16927 r.op(0, 0, w, db.top, Region.Op.UNION); 16928 } 16929 if (db.bottom < h) { 16930 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 16931 r.op(0, db.bottom, w, h, Region.Op.UNION); 16932 } 16933 final int[] location = attachInfo.mTransparentLocation; 16934 getLocationInWindow(location); 16935 r.translate(location[0], location[1]); 16936 region.op(r, Region.Op.INTERSECT); 16937 } else { 16938 region.op(db, Region.Op.DIFFERENCE); 16939 } 16940 } 16941 16942 private void checkForLongClick(int delayOffset) { 16943 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 16944 mHasPerformedLongPress = false; 16945 16946 if (mPendingCheckForLongPress == null) { 16947 mPendingCheckForLongPress = new CheckForLongPress(); 16948 } 16949 mPendingCheckForLongPress.rememberWindowAttachCount(); 16950 postDelayed(mPendingCheckForLongPress, 16951 ViewConfiguration.getLongPressTimeout() - delayOffset); 16952 } 16953 } 16954 16955 /** 16956 * Inflate a view from an XML resource. This convenience method wraps the {@link 16957 * LayoutInflater} class, which provides a full range of options for view inflation. 16958 * 16959 * @param context The Context object for your activity or application. 16960 * @param resource The resource ID to inflate 16961 * @param root A view group that will be the parent. Used to properly inflate the 16962 * layout_* parameters. 16963 * @see LayoutInflater 16964 */ 16965 public static View inflate(Context context, int resource, ViewGroup root) { 16966 LayoutInflater factory = LayoutInflater.from(context); 16967 return factory.inflate(resource, root); 16968 } 16969 16970 /** 16971 * Scroll the view with standard behavior for scrolling beyond the normal 16972 * content boundaries. Views that call this method should override 16973 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 16974 * results of an over-scroll operation. 16975 * 16976 * Views can use this method to handle any touch or fling-based scrolling. 16977 * 16978 * @param deltaX Change in X in pixels 16979 * @param deltaY Change in Y in pixels 16980 * @param scrollX Current X scroll value in pixels before applying deltaX 16981 * @param scrollY Current Y scroll value in pixels before applying deltaY 16982 * @param scrollRangeX Maximum content scroll range along the X axis 16983 * @param scrollRangeY Maximum content scroll range along the Y axis 16984 * @param maxOverScrollX Number of pixels to overscroll by in either direction 16985 * along the X axis. 16986 * @param maxOverScrollY Number of pixels to overscroll by in either direction 16987 * along the Y axis. 16988 * @param isTouchEvent true if this scroll operation is the result of a touch event. 16989 * @return true if scrolling was clamped to an over-scroll boundary along either 16990 * axis, false otherwise. 16991 */ 16992 @SuppressWarnings({"UnusedParameters"}) 16993 protected boolean overScrollBy(int deltaX, int deltaY, 16994 int scrollX, int scrollY, 16995 int scrollRangeX, int scrollRangeY, 16996 int maxOverScrollX, int maxOverScrollY, 16997 boolean isTouchEvent) { 16998 final int overScrollMode = mOverScrollMode; 16999 final boolean canScrollHorizontal = 17000 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 17001 final boolean canScrollVertical = 17002 computeVerticalScrollRange() > computeVerticalScrollExtent(); 17003 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 17004 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 17005 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 17006 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 17007 17008 int newScrollX = scrollX + deltaX; 17009 if (!overScrollHorizontal) { 17010 maxOverScrollX = 0; 17011 } 17012 17013 int newScrollY = scrollY + deltaY; 17014 if (!overScrollVertical) { 17015 maxOverScrollY = 0; 17016 } 17017 17018 // Clamp values if at the limits and record 17019 final int left = -maxOverScrollX; 17020 final int right = maxOverScrollX + scrollRangeX; 17021 final int top = -maxOverScrollY; 17022 final int bottom = maxOverScrollY + scrollRangeY; 17023 17024 boolean clampedX = false; 17025 if (newScrollX > right) { 17026 newScrollX = right; 17027 clampedX = true; 17028 } else if (newScrollX < left) { 17029 newScrollX = left; 17030 clampedX = true; 17031 } 17032 17033 boolean clampedY = false; 17034 if (newScrollY > bottom) { 17035 newScrollY = bottom; 17036 clampedY = true; 17037 } else if (newScrollY < top) { 17038 newScrollY = top; 17039 clampedY = true; 17040 } 17041 17042 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 17043 17044 return clampedX || clampedY; 17045 } 17046 17047 /** 17048 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 17049 * respond to the results of an over-scroll operation. 17050 * 17051 * @param scrollX New X scroll value in pixels 17052 * @param scrollY New Y scroll value in pixels 17053 * @param clampedX True if scrollX was clamped to an over-scroll boundary 17054 * @param clampedY True if scrollY was clamped to an over-scroll boundary 17055 */ 17056 protected void onOverScrolled(int scrollX, int scrollY, 17057 boolean clampedX, boolean clampedY) { 17058 // Intentionally empty. 17059 } 17060 17061 /** 17062 * Returns the over-scroll mode for this view. The result will be 17063 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17064 * (allow over-scrolling only if the view content is larger than the container), 17065 * or {@link #OVER_SCROLL_NEVER}. 17066 * 17067 * @return This view's over-scroll mode. 17068 */ 17069 public int getOverScrollMode() { 17070 return mOverScrollMode; 17071 } 17072 17073 /** 17074 * Set the over-scroll mode for this view. Valid over-scroll modes are 17075 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 17076 * (allow over-scrolling only if the view content is larger than the container), 17077 * or {@link #OVER_SCROLL_NEVER}. 17078 * 17079 * Setting the over-scroll mode of a view will have an effect only if the 17080 * view is capable of scrolling. 17081 * 17082 * @param overScrollMode The new over-scroll mode for this view. 17083 */ 17084 public void setOverScrollMode(int overScrollMode) { 17085 if (overScrollMode != OVER_SCROLL_ALWAYS && 17086 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 17087 overScrollMode != OVER_SCROLL_NEVER) { 17088 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 17089 } 17090 mOverScrollMode = overScrollMode; 17091 } 17092 17093 /** 17094 * Gets a scale factor that determines the distance the view should scroll 17095 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 17096 * @return The vertical scroll scale factor. 17097 * @hide 17098 */ 17099 protected float getVerticalScrollFactor() { 17100 if (mVerticalScrollFactor == 0) { 17101 TypedValue outValue = new TypedValue(); 17102 if (!mContext.getTheme().resolveAttribute( 17103 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 17104 throw new IllegalStateException( 17105 "Expected theme to define listPreferredItemHeight."); 17106 } 17107 mVerticalScrollFactor = outValue.getDimension( 17108 mContext.getResources().getDisplayMetrics()); 17109 } 17110 return mVerticalScrollFactor; 17111 } 17112 17113 /** 17114 * Gets a scale factor that determines the distance the view should scroll 17115 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 17116 * @return The horizontal scroll scale factor. 17117 * @hide 17118 */ 17119 protected float getHorizontalScrollFactor() { 17120 // TODO: Should use something else. 17121 return getVerticalScrollFactor(); 17122 } 17123 17124 /** 17125 * Return the value specifying the text direction or policy that was set with 17126 * {@link #setTextDirection(int)}. 17127 * 17128 * @return the defined text direction. It can be one of: 17129 * 17130 * {@link #TEXT_DIRECTION_INHERIT}, 17131 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17132 * {@link #TEXT_DIRECTION_ANY_RTL}, 17133 * {@link #TEXT_DIRECTION_LTR}, 17134 * {@link #TEXT_DIRECTION_RTL}, 17135 * {@link #TEXT_DIRECTION_LOCALE} 17136 * 17137 * @attr ref android.R.styleable#View_textDirection 17138 * 17139 * @hide 17140 */ 17141 @ViewDebug.ExportedProperty(category = "text", mapping = { 17142 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17143 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17144 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17145 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17146 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17147 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17148 }) 17149 public int getRawTextDirection() { 17150 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 17151 } 17152 17153 /** 17154 * Set the text direction. 17155 * 17156 * @param textDirection the direction to set. Should be one of: 17157 * 17158 * {@link #TEXT_DIRECTION_INHERIT}, 17159 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17160 * {@link #TEXT_DIRECTION_ANY_RTL}, 17161 * {@link #TEXT_DIRECTION_LTR}, 17162 * {@link #TEXT_DIRECTION_RTL}, 17163 * {@link #TEXT_DIRECTION_LOCALE} 17164 * 17165 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 17166 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 17167 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 17168 * 17169 * @attr ref android.R.styleable#View_textDirection 17170 */ 17171 public void setTextDirection(int textDirection) { 17172 if (getRawTextDirection() != textDirection) { 17173 // Reset the current text direction and the resolved one 17174 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 17175 resetResolvedTextDirection(); 17176 // Set the new text direction 17177 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 17178 // Do resolution 17179 resolveTextDirection(); 17180 // Notify change 17181 onRtlPropertiesChanged(getLayoutDirection()); 17182 // Refresh 17183 requestLayout(); 17184 invalidate(true); 17185 } 17186 } 17187 17188 /** 17189 * Return the resolved text direction. 17190 * 17191 * @return the resolved text direction. Returns one of: 17192 * 17193 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17194 * {@link #TEXT_DIRECTION_ANY_RTL}, 17195 * {@link #TEXT_DIRECTION_LTR}, 17196 * {@link #TEXT_DIRECTION_RTL}, 17197 * {@link #TEXT_DIRECTION_LOCALE} 17198 * 17199 * @attr ref android.R.styleable#View_textDirection 17200 */ 17201 @ViewDebug.ExportedProperty(category = "text", mapping = { 17202 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17203 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17204 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17205 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17206 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17207 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17208 }) 17209 public int getTextDirection() { 17210 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 17211 } 17212 17213 /** 17214 * Resolve the text direction. 17215 * 17216 * @return true if resolution has been done, false otherwise. 17217 * 17218 * @hide 17219 */ 17220 public boolean resolveTextDirection() { 17221 // Reset any previous text direction resolution 17222 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17223 17224 if (hasRtlSupport()) { 17225 // Set resolved text direction flag depending on text direction flag 17226 final int textDirection = getRawTextDirection(); 17227 switch(textDirection) { 17228 case TEXT_DIRECTION_INHERIT: 17229 if (!canResolveTextDirection()) { 17230 // We cannot do the resolution if there is no parent, so use the default one 17231 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17232 // Resolution will need to happen again later 17233 return false; 17234 } 17235 17236 // Parent has not yet resolved, so we still return the default 17237 try { 17238 if (!mParent.isTextDirectionResolved()) { 17239 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17240 // Resolution will need to happen again later 17241 return false; 17242 } 17243 } catch (AbstractMethodError e) { 17244 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17245 " does not fully implement ViewParent", e); 17246 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED | 17247 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17248 return true; 17249 } 17250 17251 // Set current resolved direction to the same value as the parent's one 17252 int parentResolvedDirection; 17253 try { 17254 parentResolvedDirection = mParent.getTextDirection(); 17255 } catch (AbstractMethodError e) { 17256 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17257 " does not fully implement ViewParent", e); 17258 parentResolvedDirection = TEXT_DIRECTION_LTR; 17259 } 17260 switch (parentResolvedDirection) { 17261 case TEXT_DIRECTION_FIRST_STRONG: 17262 case TEXT_DIRECTION_ANY_RTL: 17263 case TEXT_DIRECTION_LTR: 17264 case TEXT_DIRECTION_RTL: 17265 case TEXT_DIRECTION_LOCALE: 17266 mPrivateFlags2 |= 17267 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17268 break; 17269 default: 17270 // Default resolved direction is "first strong" heuristic 17271 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17272 } 17273 break; 17274 case TEXT_DIRECTION_FIRST_STRONG: 17275 case TEXT_DIRECTION_ANY_RTL: 17276 case TEXT_DIRECTION_LTR: 17277 case TEXT_DIRECTION_RTL: 17278 case TEXT_DIRECTION_LOCALE: 17279 // Resolved direction is the same as text direction 17280 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17281 break; 17282 default: 17283 // Default resolved direction is "first strong" heuristic 17284 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17285 } 17286 } else { 17287 // Default resolved direction is "first strong" heuristic 17288 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17289 } 17290 17291 // Set to resolved 17292 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 17293 return true; 17294 } 17295 17296 /** 17297 * Check if text direction resolution can be done. 17298 * 17299 * @return true if text direction resolution can be done otherwise return false. 17300 */ 17301 public boolean canResolveTextDirection() { 17302 switch (getRawTextDirection()) { 17303 case TEXT_DIRECTION_INHERIT: 17304 if (mParent != null) { 17305 try { 17306 return mParent.canResolveTextDirection(); 17307 } catch (AbstractMethodError e) { 17308 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17309 " does not fully implement ViewParent", e); 17310 } 17311 } 17312 return false; 17313 17314 default: 17315 return true; 17316 } 17317 } 17318 17319 /** 17320 * Reset resolved text direction. Text direction will be resolved during a call to 17321 * {@link #onMeasure(int, int)}. 17322 * 17323 * @hide 17324 */ 17325 public void resetResolvedTextDirection() { 17326 // Reset any previous text direction resolution 17327 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17328 // Set to default value 17329 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17330 } 17331 17332 /** 17333 * @return true if text direction is inherited. 17334 * 17335 * @hide 17336 */ 17337 public boolean isTextDirectionInherited() { 17338 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 17339 } 17340 17341 /** 17342 * @return true if text direction is resolved. 17343 */ 17344 public boolean isTextDirectionResolved() { 17345 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 17346 } 17347 17348 /** 17349 * Return the value specifying the text alignment or policy that was set with 17350 * {@link #setTextAlignment(int)}. 17351 * 17352 * @return the defined text alignment. It can be one of: 17353 * 17354 * {@link #TEXT_ALIGNMENT_INHERIT}, 17355 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17356 * {@link #TEXT_ALIGNMENT_CENTER}, 17357 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17358 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17359 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17360 * {@link #TEXT_ALIGNMENT_VIEW_END} 17361 * 17362 * @attr ref android.R.styleable#View_textAlignment 17363 * 17364 * @hide 17365 */ 17366 @ViewDebug.ExportedProperty(category = "text", mapping = { 17367 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17368 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17369 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17370 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17371 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17372 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17373 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17374 }) 17375 public int getRawTextAlignment() { 17376 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 17377 } 17378 17379 /** 17380 * Set the text alignment. 17381 * 17382 * @param textAlignment The text alignment to set. Should be one of 17383 * 17384 * {@link #TEXT_ALIGNMENT_INHERIT}, 17385 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17386 * {@link #TEXT_ALIGNMENT_CENTER}, 17387 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17388 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17389 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17390 * {@link #TEXT_ALIGNMENT_VIEW_END} 17391 * 17392 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 17393 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 17394 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 17395 * 17396 * @attr ref android.R.styleable#View_textAlignment 17397 */ 17398 public void setTextAlignment(int textAlignment) { 17399 if (textAlignment != getRawTextAlignment()) { 17400 // Reset the current and resolved text alignment 17401 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 17402 resetResolvedTextAlignment(); 17403 // Set the new text alignment 17404 mPrivateFlags2 |= 17405 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 17406 // Do resolution 17407 resolveTextAlignment(); 17408 // Notify change 17409 onRtlPropertiesChanged(getLayoutDirection()); 17410 // Refresh 17411 requestLayout(); 17412 invalidate(true); 17413 } 17414 } 17415 17416 /** 17417 * Return the resolved text alignment. 17418 * 17419 * @return the resolved text alignment. Returns one of: 17420 * 17421 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17422 * {@link #TEXT_ALIGNMENT_CENTER}, 17423 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17424 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17425 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17426 * {@link #TEXT_ALIGNMENT_VIEW_END} 17427 * 17428 * @attr ref android.R.styleable#View_textAlignment 17429 */ 17430 @ViewDebug.ExportedProperty(category = "text", mapping = { 17431 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17432 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17433 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17434 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17435 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17436 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17437 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17438 }) 17439 public int getTextAlignment() { 17440 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 17441 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 17442 } 17443 17444 /** 17445 * Resolve the text alignment. 17446 * 17447 * @return true if resolution has been done, false otherwise. 17448 * 17449 * @hide 17450 */ 17451 public boolean resolveTextAlignment() { 17452 // Reset any previous text alignment resolution 17453 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17454 17455 if (hasRtlSupport()) { 17456 // Set resolved text alignment flag depending on text alignment flag 17457 final int textAlignment = getRawTextAlignment(); 17458 switch (textAlignment) { 17459 case TEXT_ALIGNMENT_INHERIT: 17460 // Check if we can resolve the text alignment 17461 if (!canResolveTextAlignment()) { 17462 // We cannot do the resolution if there is no parent so use the default 17463 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17464 // Resolution will need to happen again later 17465 return false; 17466 } 17467 17468 // Parent has not yet resolved, so we still return the default 17469 try { 17470 if (!mParent.isTextAlignmentResolved()) { 17471 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17472 // Resolution will need to happen again later 17473 return false; 17474 } 17475 } catch (AbstractMethodError e) { 17476 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17477 " does not fully implement ViewParent", e); 17478 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED | 17479 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17480 return true; 17481 } 17482 17483 int parentResolvedTextAlignment; 17484 try { 17485 parentResolvedTextAlignment = mParent.getTextAlignment(); 17486 } catch (AbstractMethodError e) { 17487 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17488 " does not fully implement ViewParent", e); 17489 parentResolvedTextAlignment = TEXT_ALIGNMENT_GRAVITY; 17490 } 17491 switch (parentResolvedTextAlignment) { 17492 case TEXT_ALIGNMENT_GRAVITY: 17493 case TEXT_ALIGNMENT_TEXT_START: 17494 case TEXT_ALIGNMENT_TEXT_END: 17495 case TEXT_ALIGNMENT_CENTER: 17496 case TEXT_ALIGNMENT_VIEW_START: 17497 case TEXT_ALIGNMENT_VIEW_END: 17498 // Resolved text alignment is the same as the parent resolved 17499 // text alignment 17500 mPrivateFlags2 |= 17501 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17502 break; 17503 default: 17504 // Use default resolved text alignment 17505 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17506 } 17507 break; 17508 case TEXT_ALIGNMENT_GRAVITY: 17509 case TEXT_ALIGNMENT_TEXT_START: 17510 case TEXT_ALIGNMENT_TEXT_END: 17511 case TEXT_ALIGNMENT_CENTER: 17512 case TEXT_ALIGNMENT_VIEW_START: 17513 case TEXT_ALIGNMENT_VIEW_END: 17514 // Resolved text alignment is the same as text alignment 17515 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17516 break; 17517 default: 17518 // Use default resolved text alignment 17519 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17520 } 17521 } else { 17522 // Use default resolved text alignment 17523 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17524 } 17525 17526 // Set the resolved 17527 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17528 return true; 17529 } 17530 17531 /** 17532 * Check if text alignment resolution can be done. 17533 * 17534 * @return true if text alignment resolution can be done otherwise return false. 17535 */ 17536 public boolean canResolveTextAlignment() { 17537 switch (getRawTextAlignment()) { 17538 case TEXT_DIRECTION_INHERIT: 17539 if (mParent != null) { 17540 try { 17541 return mParent.canResolveTextAlignment(); 17542 } catch (AbstractMethodError e) { 17543 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 17544 " does not fully implement ViewParent", e); 17545 } 17546 } 17547 return false; 17548 17549 default: 17550 return true; 17551 } 17552 } 17553 17554 /** 17555 * Reset resolved text alignment. Text alignment will be resolved during a call to 17556 * {@link #onMeasure(int, int)}. 17557 * 17558 * @hide 17559 */ 17560 public void resetResolvedTextAlignment() { 17561 // Reset any previous text alignment resolution 17562 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17563 // Set to default 17564 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17565 } 17566 17567 /** 17568 * @return true if text alignment is inherited. 17569 * 17570 * @hide 17571 */ 17572 public boolean isTextAlignmentInherited() { 17573 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 17574 } 17575 17576 /** 17577 * @return true if text alignment is resolved. 17578 */ 17579 public boolean isTextAlignmentResolved() { 17580 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17581 } 17582 17583 /** 17584 * Generate a value suitable for use in {@link #setId(int)}. 17585 * This value will not collide with ID values generated at build time by aapt for R.id. 17586 * 17587 * @return a generated ID value 17588 */ 17589 public static int generateViewId() { 17590 for (;;) { 17591 final int result = sNextGeneratedId.get(); 17592 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 17593 int newValue = result + 1; 17594 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 17595 if (sNextGeneratedId.compareAndSet(result, newValue)) { 17596 return result; 17597 } 17598 } 17599 } 17600 17601 // 17602 // Properties 17603 // 17604 /** 17605 * A Property wrapper around the <code>alpha</code> functionality handled by the 17606 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 17607 */ 17608 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 17609 @Override 17610 public void setValue(View object, float value) { 17611 object.setAlpha(value); 17612 } 17613 17614 @Override 17615 public Float get(View object) { 17616 return object.getAlpha(); 17617 } 17618 }; 17619 17620 /** 17621 * A Property wrapper around the <code>translationX</code> functionality handled by the 17622 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 17623 */ 17624 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 17625 @Override 17626 public void setValue(View object, float value) { 17627 object.setTranslationX(value); 17628 } 17629 17630 @Override 17631 public Float get(View object) { 17632 return object.getTranslationX(); 17633 } 17634 }; 17635 17636 /** 17637 * A Property wrapper around the <code>translationY</code> functionality handled by the 17638 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 17639 */ 17640 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 17641 @Override 17642 public void setValue(View object, float value) { 17643 object.setTranslationY(value); 17644 } 17645 17646 @Override 17647 public Float get(View object) { 17648 return object.getTranslationY(); 17649 } 17650 }; 17651 17652 /** 17653 * A Property wrapper around the <code>x</code> functionality handled by the 17654 * {@link View#setX(float)} and {@link View#getX()} methods. 17655 */ 17656 public static final Property<View, Float> X = new FloatProperty<View>("x") { 17657 @Override 17658 public void setValue(View object, float value) { 17659 object.setX(value); 17660 } 17661 17662 @Override 17663 public Float get(View object) { 17664 return object.getX(); 17665 } 17666 }; 17667 17668 /** 17669 * A Property wrapper around the <code>y</code> functionality handled by the 17670 * {@link View#setY(float)} and {@link View#getY()} methods. 17671 */ 17672 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 17673 @Override 17674 public void setValue(View object, float value) { 17675 object.setY(value); 17676 } 17677 17678 @Override 17679 public Float get(View object) { 17680 return object.getY(); 17681 } 17682 }; 17683 17684 /** 17685 * A Property wrapper around the <code>rotation</code> functionality handled by the 17686 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 17687 */ 17688 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 17689 @Override 17690 public void setValue(View object, float value) { 17691 object.setRotation(value); 17692 } 17693 17694 @Override 17695 public Float get(View object) { 17696 return object.getRotation(); 17697 } 17698 }; 17699 17700 /** 17701 * A Property wrapper around the <code>rotationX</code> functionality handled by the 17702 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 17703 */ 17704 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 17705 @Override 17706 public void setValue(View object, float value) { 17707 object.setRotationX(value); 17708 } 17709 17710 @Override 17711 public Float get(View object) { 17712 return object.getRotationX(); 17713 } 17714 }; 17715 17716 /** 17717 * A Property wrapper around the <code>rotationY</code> functionality handled by the 17718 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 17719 */ 17720 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 17721 @Override 17722 public void setValue(View object, float value) { 17723 object.setRotationY(value); 17724 } 17725 17726 @Override 17727 public Float get(View object) { 17728 return object.getRotationY(); 17729 } 17730 }; 17731 17732 /** 17733 * A Property wrapper around the <code>scaleX</code> functionality handled by the 17734 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 17735 */ 17736 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 17737 @Override 17738 public void setValue(View object, float value) { 17739 object.setScaleX(value); 17740 } 17741 17742 @Override 17743 public Float get(View object) { 17744 return object.getScaleX(); 17745 } 17746 }; 17747 17748 /** 17749 * A Property wrapper around the <code>scaleY</code> functionality handled by the 17750 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 17751 */ 17752 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 17753 @Override 17754 public void setValue(View object, float value) { 17755 object.setScaleY(value); 17756 } 17757 17758 @Override 17759 public Float get(View object) { 17760 return object.getScaleY(); 17761 } 17762 }; 17763 17764 /** 17765 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 17766 * Each MeasureSpec represents a requirement for either the width or the height. 17767 * A MeasureSpec is comprised of a size and a mode. There are three possible 17768 * modes: 17769 * <dl> 17770 * <dt>UNSPECIFIED</dt> 17771 * <dd> 17772 * The parent has not imposed any constraint on the child. It can be whatever size 17773 * it wants. 17774 * </dd> 17775 * 17776 * <dt>EXACTLY</dt> 17777 * <dd> 17778 * The parent has determined an exact size for the child. The child is going to be 17779 * given those bounds regardless of how big it wants to be. 17780 * </dd> 17781 * 17782 * <dt>AT_MOST</dt> 17783 * <dd> 17784 * The child can be as large as it wants up to the specified size. 17785 * </dd> 17786 * </dl> 17787 * 17788 * MeasureSpecs are implemented as ints to reduce object allocation. This class 17789 * is provided to pack and unpack the <size, mode> tuple into the int. 17790 */ 17791 public static class MeasureSpec { 17792 private static final int MODE_SHIFT = 30; 17793 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 17794 17795 /** 17796 * Measure specification mode: The parent has not imposed any constraint 17797 * on the child. It can be whatever size it wants. 17798 */ 17799 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 17800 17801 /** 17802 * Measure specification mode: The parent has determined an exact size 17803 * for the child. The child is going to be given those bounds regardless 17804 * of how big it wants to be. 17805 */ 17806 public static final int EXACTLY = 1 << MODE_SHIFT; 17807 17808 /** 17809 * Measure specification mode: The child can be as large as it wants up 17810 * to the specified size. 17811 */ 17812 public static final int AT_MOST = 2 << MODE_SHIFT; 17813 17814 /** 17815 * Creates a measure specification based on the supplied size and mode. 17816 * 17817 * The mode must always be one of the following: 17818 * <ul> 17819 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 17820 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 17821 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 17822 * </ul> 17823 * 17824 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 17825 * implementation was such that the order of arguments did not matter 17826 * and overflow in either value could impact the resulting MeasureSpec. 17827 * {@link android.widget.RelativeLayout} was affected by this bug. 17828 * Apps targeting API levels greater than 17 will get the fixed, more strict 17829 * behavior.</p> 17830 * 17831 * @param size the size of the measure specification 17832 * @param mode the mode of the measure specification 17833 * @return the measure specification based on size and mode 17834 */ 17835 public static int makeMeasureSpec(int size, int mode) { 17836 if (sUseBrokenMakeMeasureSpec) { 17837 return size + mode; 17838 } else { 17839 return (size & ~MODE_MASK) | (mode & MODE_MASK); 17840 } 17841 } 17842 17843 /** 17844 * Extracts the mode from the supplied measure specification. 17845 * 17846 * @param measureSpec the measure specification to extract the mode from 17847 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 17848 * {@link android.view.View.MeasureSpec#AT_MOST} or 17849 * {@link android.view.View.MeasureSpec#EXACTLY} 17850 */ 17851 public static int getMode(int measureSpec) { 17852 return (measureSpec & MODE_MASK); 17853 } 17854 17855 /** 17856 * Extracts the size from the supplied measure specification. 17857 * 17858 * @param measureSpec the measure specification to extract the size from 17859 * @return the size in pixels defined in the supplied measure specification 17860 */ 17861 public static int getSize(int measureSpec) { 17862 return (measureSpec & ~MODE_MASK); 17863 } 17864 17865 static int adjust(int measureSpec, int delta) { 17866 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 17867 } 17868 17869 /** 17870 * Returns a String representation of the specified measure 17871 * specification. 17872 * 17873 * @param measureSpec the measure specification to convert to a String 17874 * @return a String with the following format: "MeasureSpec: MODE SIZE" 17875 */ 17876 public static String toString(int measureSpec) { 17877 int mode = getMode(measureSpec); 17878 int size = getSize(measureSpec); 17879 17880 StringBuilder sb = new StringBuilder("MeasureSpec: "); 17881 17882 if (mode == UNSPECIFIED) 17883 sb.append("UNSPECIFIED "); 17884 else if (mode == EXACTLY) 17885 sb.append("EXACTLY "); 17886 else if (mode == AT_MOST) 17887 sb.append("AT_MOST "); 17888 else 17889 sb.append(mode).append(" "); 17890 17891 sb.append(size); 17892 return sb.toString(); 17893 } 17894 } 17895 17896 class CheckForLongPress implements Runnable { 17897 17898 private int mOriginalWindowAttachCount; 17899 17900 public void run() { 17901 if (isPressed() && (mParent != null) 17902 && mOriginalWindowAttachCount == mWindowAttachCount) { 17903 if (performLongClick()) { 17904 mHasPerformedLongPress = true; 17905 } 17906 } 17907 } 17908 17909 public void rememberWindowAttachCount() { 17910 mOriginalWindowAttachCount = mWindowAttachCount; 17911 } 17912 } 17913 17914 private final class CheckForTap implements Runnable { 17915 public void run() { 17916 mPrivateFlags &= ~PFLAG_PREPRESSED; 17917 setPressed(true); 17918 checkForLongClick(ViewConfiguration.getTapTimeout()); 17919 } 17920 } 17921 17922 private final class PerformClick implements Runnable { 17923 public void run() { 17924 performClick(); 17925 } 17926 } 17927 17928 /** @hide */ 17929 public void hackTurnOffWindowResizeAnim(boolean off) { 17930 mAttachInfo.mTurnOffWindowResizeAnim = off; 17931 } 17932 17933 /** 17934 * This method returns a ViewPropertyAnimator object, which can be used to animate 17935 * specific properties on this View. 17936 * 17937 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 17938 */ 17939 public ViewPropertyAnimator animate() { 17940 if (mAnimator == null) { 17941 mAnimator = new ViewPropertyAnimator(this); 17942 } 17943 return mAnimator; 17944 } 17945 17946 /** 17947 * Set the current Scene that this view is in. The current scene is set only 17948 * on the root view of a scene, not for every view in that hierarchy. This 17949 * information is used by Scene to determine whether there is a previous 17950 * scene which should be exited before the new scene is entered. 17951 * 17952 * @param scene The new scene being set on the view 17953 * 17954 * @hide 17955 */ 17956 public void setCurrentScene(Scene scene) { 17957 mCurrentScene = scene; 17958 } 17959 17960 /** 17961 * Gets the current {@link Scene} set on this view. A scene is set on a view 17962 * only if that view is the scene root. 17963 * 17964 * @return The current Scene set on this view. A value of null indicates that 17965 * no Scene is current set. 17966 */ 17967 public Scene getCurrentScene() { 17968 return mCurrentScene; 17969 } 17970 17971 /** 17972 * Interface definition for a callback to be invoked when a hardware key event is 17973 * dispatched to this view. The callback will be invoked before the key event is 17974 * given to the view. This is only useful for hardware keyboards; a software input 17975 * method has no obligation to trigger this listener. 17976 */ 17977 public interface OnKeyListener { 17978 /** 17979 * Called when a hardware key is dispatched to a view. This allows listeners to 17980 * get a chance to respond before the target view. 17981 * <p>Key presses in software keyboards will generally NOT trigger this method, 17982 * although some may elect to do so in some situations. Do not assume a 17983 * software input method has to be key-based; even if it is, it may use key presses 17984 * in a different way than you expect, so there is no way to reliably catch soft 17985 * input key presses. 17986 * 17987 * @param v The view the key has been dispatched to. 17988 * @param keyCode The code for the physical key that was pressed 17989 * @param event The KeyEvent object containing full information about 17990 * the event. 17991 * @return True if the listener has consumed the event, false otherwise. 17992 */ 17993 boolean onKey(View v, int keyCode, KeyEvent event); 17994 } 17995 17996 /** 17997 * Interface definition for a callback to be invoked when a touch event is 17998 * dispatched to this view. The callback will be invoked before the touch 17999 * event is given to the view. 18000 */ 18001 public interface OnTouchListener { 18002 /** 18003 * Called when a touch event is dispatched to a view. This allows listeners to 18004 * get a chance to respond before the target view. 18005 * 18006 * @param v The view the touch event has been dispatched to. 18007 * @param event The MotionEvent object containing full information about 18008 * the event. 18009 * @return True if the listener has consumed the event, false otherwise. 18010 */ 18011 boolean onTouch(View v, MotionEvent event); 18012 } 18013 18014 /** 18015 * Interface definition for a callback to be invoked when a hover event is 18016 * dispatched to this view. The callback will be invoked before the hover 18017 * event is given to the view. 18018 */ 18019 public interface OnHoverListener { 18020 /** 18021 * Called when a hover event is dispatched to a view. This allows listeners to 18022 * get a chance to respond before the target view. 18023 * 18024 * @param v The view the hover event has been dispatched to. 18025 * @param event The MotionEvent object containing full information about 18026 * the event. 18027 * @return True if the listener has consumed the event, false otherwise. 18028 */ 18029 boolean onHover(View v, MotionEvent event); 18030 } 18031 18032 /** 18033 * Interface definition for a callback to be invoked when a generic motion event is 18034 * dispatched to this view. The callback will be invoked before the generic motion 18035 * event is given to the view. 18036 */ 18037 public interface OnGenericMotionListener { 18038 /** 18039 * Called when a generic motion event is dispatched to a view. This allows listeners to 18040 * get a chance to respond before the target view. 18041 * 18042 * @param v The view the generic motion event has been dispatched to. 18043 * @param event The MotionEvent object containing full information about 18044 * the event. 18045 * @return True if the listener has consumed the event, false otherwise. 18046 */ 18047 boolean onGenericMotion(View v, MotionEvent event); 18048 } 18049 18050 /** 18051 * Interface definition for a callback to be invoked when a view has been clicked and held. 18052 */ 18053 public interface OnLongClickListener { 18054 /** 18055 * Called when a view has been clicked and held. 18056 * 18057 * @param v The view that was clicked and held. 18058 * 18059 * @return true if the callback consumed the long click, false otherwise. 18060 */ 18061 boolean onLongClick(View v); 18062 } 18063 18064 /** 18065 * Interface definition for a callback to be invoked when a drag is being dispatched 18066 * to this view. The callback will be invoked before the hosting view's own 18067 * onDrag(event) method. If the listener wants to fall back to the hosting view's 18068 * onDrag(event) behavior, it should return 'false' from this callback. 18069 * 18070 * <div class="special reference"> 18071 * <h3>Developer Guides</h3> 18072 * <p>For a guide to implementing drag and drop features, read the 18073 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 18074 * </div> 18075 */ 18076 public interface OnDragListener { 18077 /** 18078 * Called when a drag event is dispatched to a view. This allows listeners 18079 * to get a chance to override base View behavior. 18080 * 18081 * @param v The View that received the drag event. 18082 * @param event The {@link android.view.DragEvent} object for the drag event. 18083 * @return {@code true} if the drag event was handled successfully, or {@code false} 18084 * if the drag event was not handled. Note that {@code false} will trigger the View 18085 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 18086 */ 18087 boolean onDrag(View v, DragEvent event); 18088 } 18089 18090 /** 18091 * Interface definition for a callback to be invoked when the focus state of 18092 * a view changed. 18093 */ 18094 public interface OnFocusChangeListener { 18095 /** 18096 * Called when the focus state of a view has changed. 18097 * 18098 * @param v The view whose state has changed. 18099 * @param hasFocus The new focus state of v. 18100 */ 18101 void onFocusChange(View v, boolean hasFocus); 18102 } 18103 18104 /** 18105 * Interface definition for a callback to be invoked when a view is clicked. 18106 */ 18107 public interface OnClickListener { 18108 /** 18109 * Called when a view has been clicked. 18110 * 18111 * @param v The view that was clicked. 18112 */ 18113 void onClick(View v); 18114 } 18115 18116 /** 18117 * Interface definition for a callback to be invoked when the context menu 18118 * for this view is being built. 18119 */ 18120 public interface OnCreateContextMenuListener { 18121 /** 18122 * Called when the context menu for this view is being built. It is not 18123 * safe to hold onto the menu after this method returns. 18124 * 18125 * @param menu The context menu that is being built 18126 * @param v The view for which the context menu is being built 18127 * @param menuInfo Extra information about the item for which the 18128 * context menu should be shown. This information will vary 18129 * depending on the class of v. 18130 */ 18131 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 18132 } 18133 18134 /** 18135 * Interface definition for a callback to be invoked when the status bar changes 18136 * visibility. This reports <strong>global</strong> changes to the system UI 18137 * state, not what the application is requesting. 18138 * 18139 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 18140 */ 18141 public interface OnSystemUiVisibilityChangeListener { 18142 /** 18143 * Called when the status bar changes visibility because of a call to 18144 * {@link View#setSystemUiVisibility(int)}. 18145 * 18146 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 18147 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 18148 * This tells you the <strong>global</strong> state of these UI visibility 18149 * flags, not what your app is currently applying. 18150 */ 18151 public void onSystemUiVisibilityChange(int visibility); 18152 } 18153 18154 /** 18155 * Interface definition for a callback to be invoked when this view is attached 18156 * or detached from its window. 18157 */ 18158 public interface OnAttachStateChangeListener { 18159 /** 18160 * Called when the view is attached to a window. 18161 * @param v The view that was attached 18162 */ 18163 public void onViewAttachedToWindow(View v); 18164 /** 18165 * Called when the view is detached from a window. 18166 * @param v The view that was detached 18167 */ 18168 public void onViewDetachedFromWindow(View v); 18169 } 18170 18171 private final class UnsetPressedState implements Runnable { 18172 public void run() { 18173 setPressed(false); 18174 } 18175 } 18176 18177 /** 18178 * Base class for derived classes that want to save and restore their own 18179 * state in {@link android.view.View#onSaveInstanceState()}. 18180 */ 18181 public static class BaseSavedState extends AbsSavedState { 18182 /** 18183 * Constructor used when reading from a parcel. Reads the state of the superclass. 18184 * 18185 * @param source 18186 */ 18187 public BaseSavedState(Parcel source) { 18188 super(source); 18189 } 18190 18191 /** 18192 * Constructor called by derived classes when creating their SavedState objects 18193 * 18194 * @param superState The state of the superclass of this view 18195 */ 18196 public BaseSavedState(Parcelable superState) { 18197 super(superState); 18198 } 18199 18200 public static final Parcelable.Creator<BaseSavedState> CREATOR = 18201 new Parcelable.Creator<BaseSavedState>() { 18202 public BaseSavedState createFromParcel(Parcel in) { 18203 return new BaseSavedState(in); 18204 } 18205 18206 public BaseSavedState[] newArray(int size) { 18207 return new BaseSavedState[size]; 18208 } 18209 }; 18210 } 18211 18212 /** 18213 * A set of information given to a view when it is attached to its parent 18214 * window. 18215 */ 18216 static class AttachInfo { 18217 interface Callbacks { 18218 void playSoundEffect(int effectId); 18219 boolean performHapticFeedback(int effectId, boolean always); 18220 } 18221 18222 /** 18223 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 18224 * to a Handler. This class contains the target (View) to invalidate and 18225 * the coordinates of the dirty rectangle. 18226 * 18227 * For performance purposes, this class also implements a pool of up to 18228 * POOL_LIMIT objects that get reused. This reduces memory allocations 18229 * whenever possible. 18230 */ 18231 static class InvalidateInfo { 18232 private static final int POOL_LIMIT = 10; 18233 18234 private static final SynchronizedPool<InvalidateInfo> sPool = 18235 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 18236 18237 View target; 18238 18239 int left; 18240 int top; 18241 int right; 18242 int bottom; 18243 18244 public static InvalidateInfo obtain() { 18245 InvalidateInfo instance = sPool.acquire(); 18246 return (instance != null) ? instance : new InvalidateInfo(); 18247 } 18248 18249 public void recycle() { 18250 target = null; 18251 sPool.release(this); 18252 } 18253 } 18254 18255 final IWindowSession mSession; 18256 18257 final IWindow mWindow; 18258 18259 final IBinder mWindowToken; 18260 18261 final Display mDisplay; 18262 18263 final Callbacks mRootCallbacks; 18264 18265 HardwareCanvas mHardwareCanvas; 18266 18267 IWindowId mIWindowId; 18268 WindowId mWindowId; 18269 18270 /** 18271 * The top view of the hierarchy. 18272 */ 18273 View mRootView; 18274 18275 IBinder mPanelParentWindowToken; 18276 Surface mSurface; 18277 18278 boolean mHardwareAccelerated; 18279 boolean mHardwareAccelerationRequested; 18280 HardwareRenderer mHardwareRenderer; 18281 18282 boolean mScreenOn; 18283 18284 /** 18285 * Scale factor used by the compatibility mode 18286 */ 18287 float mApplicationScale; 18288 18289 /** 18290 * Indicates whether the application is in compatibility mode 18291 */ 18292 boolean mScalingRequired; 18293 18294 /** 18295 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 18296 */ 18297 boolean mTurnOffWindowResizeAnim; 18298 18299 /** 18300 * Left position of this view's window 18301 */ 18302 int mWindowLeft; 18303 18304 /** 18305 * Top position of this view's window 18306 */ 18307 int mWindowTop; 18308 18309 /** 18310 * Indicates whether views need to use 32-bit drawing caches 18311 */ 18312 boolean mUse32BitDrawingCache; 18313 18314 /** 18315 * For windows that are full-screen but using insets to layout inside 18316 * of the screen areas, these are the current insets to appear inside 18317 * the overscan area of the display. 18318 */ 18319 final Rect mOverscanInsets = new Rect(); 18320 18321 /** 18322 * For windows that are full-screen but using insets to layout inside 18323 * of the screen decorations, these are the current insets for the 18324 * content of the window. 18325 */ 18326 final Rect mContentInsets = new Rect(); 18327 18328 /** 18329 * For windows that are full-screen but using insets to layout inside 18330 * of the screen decorations, these are the current insets for the 18331 * actual visible parts of the window. 18332 */ 18333 final Rect mVisibleInsets = new Rect(); 18334 18335 /** 18336 * The internal insets given by this window. This value is 18337 * supplied by the client (through 18338 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 18339 * be given to the window manager when changed to be used in laying 18340 * out windows behind it. 18341 */ 18342 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 18343 = new ViewTreeObserver.InternalInsetsInfo(); 18344 18345 /** 18346 * All views in the window's hierarchy that serve as scroll containers, 18347 * used to determine if the window can be resized or must be panned 18348 * to adjust for a soft input area. 18349 */ 18350 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 18351 18352 final KeyEvent.DispatcherState mKeyDispatchState 18353 = new KeyEvent.DispatcherState(); 18354 18355 /** 18356 * Indicates whether the view's window currently has the focus. 18357 */ 18358 boolean mHasWindowFocus; 18359 18360 /** 18361 * The current visibility of the window. 18362 */ 18363 int mWindowVisibility; 18364 18365 /** 18366 * Indicates the time at which drawing started to occur. 18367 */ 18368 long mDrawingTime; 18369 18370 /** 18371 * Indicates whether or not ignoring the DIRTY_MASK flags. 18372 */ 18373 boolean mIgnoreDirtyState; 18374 18375 /** 18376 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 18377 * to avoid clearing that flag prematurely. 18378 */ 18379 boolean mSetIgnoreDirtyState = false; 18380 18381 /** 18382 * Indicates whether the view's window is currently in touch mode. 18383 */ 18384 boolean mInTouchMode; 18385 18386 /** 18387 * Indicates that ViewAncestor should trigger a global layout change 18388 * the next time it performs a traversal 18389 */ 18390 boolean mRecomputeGlobalAttributes; 18391 18392 /** 18393 * Always report new attributes at next traversal. 18394 */ 18395 boolean mForceReportNewAttributes; 18396 18397 /** 18398 * Set during a traveral if any views want to keep the screen on. 18399 */ 18400 boolean mKeepScreenOn; 18401 18402 /** 18403 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 18404 */ 18405 int mSystemUiVisibility; 18406 18407 /** 18408 * Hack to force certain system UI visibility flags to be cleared. 18409 */ 18410 int mDisabledSystemUiVisibility; 18411 18412 /** 18413 * Last global system UI visibility reported by the window manager. 18414 */ 18415 int mGlobalSystemUiVisibility; 18416 18417 /** 18418 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 18419 * attached. 18420 */ 18421 boolean mHasSystemUiListeners; 18422 18423 /** 18424 * Set if the window has requested to extend into the overscan region 18425 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 18426 */ 18427 boolean mOverscanRequested; 18428 18429 /** 18430 * Set if the visibility of any views has changed. 18431 */ 18432 boolean mViewVisibilityChanged; 18433 18434 /** 18435 * Set to true if a view has been scrolled. 18436 */ 18437 boolean mViewScrollChanged; 18438 18439 /** 18440 * Global to the view hierarchy used as a temporary for dealing with 18441 * x/y points in the transparent region computations. 18442 */ 18443 final int[] mTransparentLocation = new int[2]; 18444 18445 /** 18446 * Global to the view hierarchy used as a temporary for dealing with 18447 * x/y points in the ViewGroup.invalidateChild implementation. 18448 */ 18449 final int[] mInvalidateChildLocation = new int[2]; 18450 18451 18452 /** 18453 * Global to the view hierarchy used as a temporary for dealing with 18454 * x/y location when view is transformed. 18455 */ 18456 final float[] mTmpTransformLocation = new float[2]; 18457 18458 /** 18459 * The view tree observer used to dispatch global events like 18460 * layout, pre-draw, touch mode change, etc. 18461 */ 18462 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 18463 18464 /** 18465 * A Canvas used by the view hierarchy to perform bitmap caching. 18466 */ 18467 Canvas mCanvas; 18468 18469 /** 18470 * The view root impl. 18471 */ 18472 final ViewRootImpl mViewRootImpl; 18473 18474 /** 18475 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 18476 * handler can be used to pump events in the UI events queue. 18477 */ 18478 final Handler mHandler; 18479 18480 /** 18481 * Temporary for use in computing invalidate rectangles while 18482 * calling up the hierarchy. 18483 */ 18484 final Rect mTmpInvalRect = new Rect(); 18485 18486 /** 18487 * Temporary for use in computing hit areas with transformed views 18488 */ 18489 final RectF mTmpTransformRect = new RectF(); 18490 18491 /** 18492 * Temporary for use in transforming invalidation rect 18493 */ 18494 final Matrix mTmpMatrix = new Matrix(); 18495 18496 /** 18497 * Temporary for use in transforming invalidation rect 18498 */ 18499 final Transformation mTmpTransformation = new Transformation(); 18500 18501 /** 18502 * Temporary list for use in collecting focusable descendents of a view. 18503 */ 18504 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 18505 18506 /** 18507 * The id of the window for accessibility purposes. 18508 */ 18509 int mAccessibilityWindowId = View.NO_ID; 18510 18511 /** 18512 * Flags related to accessibility processing. 18513 * 18514 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 18515 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 18516 */ 18517 int mAccessibilityFetchFlags; 18518 18519 /** 18520 * The drawable for highlighting accessibility focus. 18521 */ 18522 Drawable mAccessibilityFocusDrawable; 18523 18524 /** 18525 * Show where the margins, bounds and layout bounds are for each view. 18526 */ 18527 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 18528 18529 /** 18530 * Point used to compute visible regions. 18531 */ 18532 final Point mPoint = new Point(); 18533 18534 /** 18535 * Used to track which View originated a requestLayout() call, used when 18536 * requestLayout() is called during layout. 18537 */ 18538 View mViewRequestingLayout; 18539 18540 /** 18541 * Creates a new set of attachment information with the specified 18542 * events handler and thread. 18543 * 18544 * @param handler the events handler the view must use 18545 */ 18546 AttachInfo(IWindowSession session, IWindow window, Display display, 18547 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 18548 mSession = session; 18549 mWindow = window; 18550 mWindowToken = window.asBinder(); 18551 mDisplay = display; 18552 mViewRootImpl = viewRootImpl; 18553 mHandler = handler; 18554 mRootCallbacks = effectPlayer; 18555 } 18556 } 18557 18558 /** 18559 * <p>ScrollabilityCache holds various fields used by a View when scrolling 18560 * is supported. This avoids keeping too many unused fields in most 18561 * instances of View.</p> 18562 */ 18563 private static class ScrollabilityCache implements Runnable { 18564 18565 /** 18566 * Scrollbars are not visible 18567 */ 18568 public static final int OFF = 0; 18569 18570 /** 18571 * Scrollbars are visible 18572 */ 18573 public static final int ON = 1; 18574 18575 /** 18576 * Scrollbars are fading away 18577 */ 18578 public static final int FADING = 2; 18579 18580 public boolean fadeScrollBars; 18581 18582 public int fadingEdgeLength; 18583 public int scrollBarDefaultDelayBeforeFade; 18584 public int scrollBarFadeDuration; 18585 18586 public int scrollBarSize; 18587 public ScrollBarDrawable scrollBar; 18588 public float[] interpolatorValues; 18589 public View host; 18590 18591 public final Paint paint; 18592 public final Matrix matrix; 18593 public Shader shader; 18594 18595 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 18596 18597 private static final float[] OPAQUE = { 255 }; 18598 private static final float[] TRANSPARENT = { 0.0f }; 18599 18600 /** 18601 * When fading should start. This time moves into the future every time 18602 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 18603 */ 18604 public long fadeStartTime; 18605 18606 18607 /** 18608 * The current state of the scrollbars: ON, OFF, or FADING 18609 */ 18610 public int state = OFF; 18611 18612 private int mLastColor; 18613 18614 public ScrollabilityCache(ViewConfiguration configuration, View host) { 18615 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 18616 scrollBarSize = configuration.getScaledScrollBarSize(); 18617 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 18618 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 18619 18620 paint = new Paint(); 18621 matrix = new Matrix(); 18622 // use use a height of 1, and then wack the matrix each time we 18623 // actually use it. 18624 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18625 paint.setShader(shader); 18626 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18627 18628 this.host = host; 18629 } 18630 18631 public void setFadeColor(int color) { 18632 if (color != mLastColor) { 18633 mLastColor = color; 18634 18635 if (color != 0) { 18636 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 18637 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 18638 paint.setShader(shader); 18639 // Restore the default transfer mode (src_over) 18640 paint.setXfermode(null); 18641 } else { 18642 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18643 paint.setShader(shader); 18644 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18645 } 18646 } 18647 } 18648 18649 public void run() { 18650 long now = AnimationUtils.currentAnimationTimeMillis(); 18651 if (now >= fadeStartTime) { 18652 18653 // the animation fades the scrollbars out by changing 18654 // the opacity (alpha) from fully opaque to fully 18655 // transparent 18656 int nextFrame = (int) now; 18657 int framesCount = 0; 18658 18659 Interpolator interpolator = scrollBarInterpolator; 18660 18661 // Start opaque 18662 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 18663 18664 // End transparent 18665 nextFrame += scrollBarFadeDuration; 18666 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 18667 18668 state = FADING; 18669 18670 // Kick off the fade animation 18671 host.invalidate(true); 18672 } 18673 } 18674 } 18675 18676 /** 18677 * Resuable callback for sending 18678 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 18679 */ 18680 private class SendViewScrolledAccessibilityEvent implements Runnable { 18681 public volatile boolean mIsPending; 18682 18683 public void run() { 18684 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 18685 mIsPending = false; 18686 } 18687 } 18688 18689 /** 18690 * <p> 18691 * This class represents a delegate that can be registered in a {@link View} 18692 * to enhance accessibility support via composition rather via inheritance. 18693 * It is specifically targeted to widget developers that extend basic View 18694 * classes i.e. classes in package android.view, that would like their 18695 * applications to be backwards compatible. 18696 * </p> 18697 * <div class="special reference"> 18698 * <h3>Developer Guides</h3> 18699 * <p>For more information about making applications accessible, read the 18700 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 18701 * developer guide.</p> 18702 * </div> 18703 * <p> 18704 * A scenario in which a developer would like to use an accessibility delegate 18705 * is overriding a method introduced in a later API version then the minimal API 18706 * version supported by the application. For example, the method 18707 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 18708 * in API version 4 when the accessibility APIs were first introduced. If a 18709 * developer would like his application to run on API version 4 devices (assuming 18710 * all other APIs used by the application are version 4 or lower) and take advantage 18711 * of this method, instead of overriding the method which would break the application's 18712 * backwards compatibility, he can override the corresponding method in this 18713 * delegate and register the delegate in the target View if the API version of 18714 * the system is high enough i.e. the API version is same or higher to the API 18715 * version that introduced 18716 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 18717 * </p> 18718 * <p> 18719 * Here is an example implementation: 18720 * </p> 18721 * <code><pre><p> 18722 * if (Build.VERSION.SDK_INT >= 14) { 18723 * // If the API version is equal of higher than the version in 18724 * // which onInitializeAccessibilityNodeInfo was introduced we 18725 * // register a delegate with a customized implementation. 18726 * View view = findViewById(R.id.view_id); 18727 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 18728 * public void onInitializeAccessibilityNodeInfo(View host, 18729 * AccessibilityNodeInfo info) { 18730 * // Let the default implementation populate the info. 18731 * super.onInitializeAccessibilityNodeInfo(host, info); 18732 * // Set some other information. 18733 * info.setEnabled(host.isEnabled()); 18734 * } 18735 * }); 18736 * } 18737 * </code></pre></p> 18738 * <p> 18739 * This delegate contains methods that correspond to the accessibility methods 18740 * in View. If a delegate has been specified the implementation in View hands 18741 * off handling to the corresponding method in this delegate. The default 18742 * implementation the delegate methods behaves exactly as the corresponding 18743 * method in View for the case of no accessibility delegate been set. Hence, 18744 * to customize the behavior of a View method, clients can override only the 18745 * corresponding delegate method without altering the behavior of the rest 18746 * accessibility related methods of the host view. 18747 * </p> 18748 */ 18749 public static class AccessibilityDelegate { 18750 18751 /** 18752 * Sends an accessibility event of the given type. If accessibility is not 18753 * enabled this method has no effect. 18754 * <p> 18755 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 18756 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 18757 * been set. 18758 * </p> 18759 * 18760 * @param host The View hosting the delegate. 18761 * @param eventType The type of the event to send. 18762 * 18763 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 18764 */ 18765 public void sendAccessibilityEvent(View host, int eventType) { 18766 host.sendAccessibilityEventInternal(eventType); 18767 } 18768 18769 /** 18770 * Performs the specified accessibility action on the view. For 18771 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 18772 * <p> 18773 * The default implementation behaves as 18774 * {@link View#performAccessibilityAction(int, Bundle) 18775 * View#performAccessibilityAction(int, Bundle)} for the case of 18776 * no accessibility delegate been set. 18777 * </p> 18778 * 18779 * @param action The action to perform. 18780 * @return Whether the action was performed. 18781 * 18782 * @see View#performAccessibilityAction(int, Bundle) 18783 * View#performAccessibilityAction(int, Bundle) 18784 */ 18785 public boolean performAccessibilityAction(View host, int action, Bundle args) { 18786 return host.performAccessibilityActionInternal(action, args); 18787 } 18788 18789 /** 18790 * Sends an accessibility event. This method behaves exactly as 18791 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 18792 * empty {@link AccessibilityEvent} and does not perform a check whether 18793 * accessibility is enabled. 18794 * <p> 18795 * The default implementation behaves as 18796 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18797 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 18798 * the case of no accessibility delegate been set. 18799 * </p> 18800 * 18801 * @param host The View hosting the delegate. 18802 * @param event The event to send. 18803 * 18804 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18805 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18806 */ 18807 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 18808 host.sendAccessibilityEventUncheckedInternal(event); 18809 } 18810 18811 /** 18812 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 18813 * to its children for adding their text content to the event. 18814 * <p> 18815 * The default implementation behaves as 18816 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18817 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 18818 * the case of no accessibility delegate been set. 18819 * </p> 18820 * 18821 * @param host The View hosting the delegate. 18822 * @param event The event. 18823 * @return True if the event population was completed. 18824 * 18825 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18826 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18827 */ 18828 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18829 return host.dispatchPopulateAccessibilityEventInternal(event); 18830 } 18831 18832 /** 18833 * Gives a chance to the host View to populate the accessibility event with its 18834 * text content. 18835 * <p> 18836 * The default implementation behaves as 18837 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 18838 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 18839 * the case of no accessibility delegate been set. 18840 * </p> 18841 * 18842 * @param host The View hosting the delegate. 18843 * @param event The accessibility event which to populate. 18844 * 18845 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 18846 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 18847 */ 18848 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18849 host.onPopulateAccessibilityEventInternal(event); 18850 } 18851 18852 /** 18853 * Initializes an {@link AccessibilityEvent} with information about the 18854 * the host View which is the event source. 18855 * <p> 18856 * The default implementation behaves as 18857 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 18858 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 18859 * the case of no accessibility delegate been set. 18860 * </p> 18861 * 18862 * @param host The View hosting the delegate. 18863 * @param event The event to initialize. 18864 * 18865 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 18866 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 18867 */ 18868 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 18869 host.onInitializeAccessibilityEventInternal(event); 18870 } 18871 18872 /** 18873 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 18874 * <p> 18875 * The default implementation behaves as 18876 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18877 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 18878 * the case of no accessibility delegate been set. 18879 * </p> 18880 * 18881 * @param host The View hosting the delegate. 18882 * @param info The instance to initialize. 18883 * 18884 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18885 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18886 */ 18887 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 18888 host.onInitializeAccessibilityNodeInfoInternal(info); 18889 } 18890 18891 /** 18892 * Called when a child of the host View has requested sending an 18893 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 18894 * to augment the event. 18895 * <p> 18896 * The default implementation behaves as 18897 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18898 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 18899 * the case of no accessibility delegate been set. 18900 * </p> 18901 * 18902 * @param host The View hosting the delegate. 18903 * @param child The child which requests sending the event. 18904 * @param event The event to be sent. 18905 * @return True if the event should be sent 18906 * 18907 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18908 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18909 */ 18910 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 18911 AccessibilityEvent event) { 18912 return host.onRequestSendAccessibilityEventInternal(child, event); 18913 } 18914 18915 /** 18916 * Gets the provider for managing a virtual view hierarchy rooted at this View 18917 * and reported to {@link android.accessibilityservice.AccessibilityService}s 18918 * that explore the window content. 18919 * <p> 18920 * The default implementation behaves as 18921 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 18922 * the case of no accessibility delegate been set. 18923 * </p> 18924 * 18925 * @return The provider. 18926 * 18927 * @see AccessibilityNodeProvider 18928 */ 18929 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 18930 return null; 18931 } 18932 18933 /** 18934 * Returns an {@link AccessibilityNodeInfo} representing the host view from the 18935 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 18936 * This method is responsible for obtaining an accessibility node info from a 18937 * pool of reusable instances and calling 18938 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on the host 18939 * view to initialize the former. 18940 * <p> 18941 * <strong>Note:</strong> The client is responsible for recycling the obtained 18942 * instance by calling {@link AccessibilityNodeInfo#recycle()} to minimize object 18943 * creation. 18944 * </p> 18945 * <p> 18946 * The default implementation behaves as 18947 * {@link View#createAccessibilityNodeInfo() View#createAccessibilityNodeInfo()} for 18948 * the case of no accessibility delegate been set. 18949 * </p> 18950 * @return A populated {@link AccessibilityNodeInfo}. 18951 * 18952 * @see AccessibilityNodeInfo 18953 * 18954 * @hide 18955 */ 18956 public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { 18957 return host.createAccessibilityNodeInfoInternal(); 18958 } 18959 } 18960 18961 private class MatchIdPredicate implements Predicate<View> { 18962 public int mId; 18963 18964 @Override 18965 public boolean apply(View view) { 18966 return (view.mID == mId); 18967 } 18968 } 18969 18970 private class MatchLabelForPredicate implements Predicate<View> { 18971 private int mLabeledId; 18972 18973 @Override 18974 public boolean apply(View view) { 18975 return (view.mLabelForId == mLabeledId); 18976 } 18977 } 18978 18979 private class SendViewStateChangedAccessibilityEvent implements Runnable { 18980 private boolean mPosted; 18981 private long mLastEventTimeMillis; 18982 18983 public void run() { 18984 mPosted = false; 18985 mLastEventTimeMillis = SystemClock.uptimeMillis(); 18986 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 18987 AccessibilityEvent event = AccessibilityEvent.obtain(); 18988 event.setEventType(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED); 18989 event.setContentChangeType(AccessibilityEvent.CONTENT_CHANGE_TYPE_NODE); 18990 sendAccessibilityEventUnchecked(event); 18991 } 18992 } 18993 18994 public void runOrPost() { 18995 if (mPosted) { 18996 return; 18997 } 18998 final long timeSinceLastMillis = SystemClock.uptimeMillis() - mLastEventTimeMillis; 18999 final long minEventIntevalMillis = 19000 ViewConfiguration.getSendRecurringAccessibilityEventsInterval(); 19001 if (timeSinceLastMillis >= minEventIntevalMillis) { 19002 removeCallbacks(this); 19003 run(); 19004 } else { 19005 postDelayed(this, minEventIntevalMillis - timeSinceLastMillis); 19006 mPosted = true; 19007 } 19008 } 19009 } 19010 19011 /** 19012 * Dump all private flags in readable format, useful for documentation and 19013 * sanity checking. 19014 */ 19015 private static void dumpFlags() { 19016 final HashMap<String, String> found = Maps.newHashMap(); 19017 try { 19018 for (Field field : View.class.getDeclaredFields()) { 19019 final int modifiers = field.getModifiers(); 19020 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 19021 if (field.getType().equals(int.class)) { 19022 final int value = field.getInt(null); 19023 dumpFlag(found, field.getName(), value); 19024 } else if (field.getType().equals(int[].class)) { 19025 final int[] values = (int[]) field.get(null); 19026 for (int i = 0; i < values.length; i++) { 19027 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 19028 } 19029 } 19030 } 19031 } 19032 } catch (IllegalAccessException e) { 19033 throw new RuntimeException(e); 19034 } 19035 19036 final ArrayList<String> keys = Lists.newArrayList(); 19037 keys.addAll(found.keySet()); 19038 Collections.sort(keys); 19039 for (String key : keys) { 19040 Log.d(VIEW_LOG_TAG, found.get(key)); 19041 } 19042 } 19043 19044 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 19045 // Sort flags by prefix, then by bits, always keeping unique keys 19046 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 19047 final int prefix = name.indexOf('_'); 19048 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 19049 final String output = bits + " " + name; 19050 found.put(key, output); 19051 } 19052} 19053