View.java revision f9d08423e3d922d22f628e2628885b3d966e40be
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.Pool; 56import android.util.Poolable; 57import android.util.PoolableManager; 58import android.util.Pools; 59import android.util.Property; 60import android.util.SparseArray; 61import android.util.TypedValue; 62import android.view.ContextMenu.ContextMenuInfo; 63import android.view.AccessibilityIterators.TextSegmentIterator; 64import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 65import android.view.AccessibilityIterators.WordTextSegmentIterator; 66import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 67import android.view.accessibility.AccessibilityEvent; 68import android.view.accessibility.AccessibilityEventSource; 69import android.view.accessibility.AccessibilityManager; 70import android.view.accessibility.AccessibilityNodeInfo; 71import android.view.accessibility.AccessibilityNodeProvider; 72import android.view.animation.Animation; 73import android.view.animation.AnimationUtils; 74import android.view.animation.Transformation; 75import android.view.inputmethod.EditorInfo; 76import android.view.inputmethod.InputConnection; 77import android.view.inputmethod.InputMethodManager; 78import android.widget.ScrollBarDrawable; 79 80import static android.os.Build.VERSION_CODES.*; 81import static java.lang.Math.max; 82 83import com.android.internal.R; 84import com.android.internal.util.Predicate; 85import com.android.internal.view.menu.MenuBuilder; 86import com.google.android.collect.Lists; 87import com.google.android.collect.Maps; 88 89import java.lang.ref.WeakReference; 90import java.lang.reflect.Field; 91import java.lang.reflect.InvocationTargetException; 92import java.lang.reflect.Method; 93import java.lang.reflect.Modifier; 94import java.util.ArrayList; 95import java.util.Arrays; 96import java.util.Collections; 97import java.util.HashMap; 98import java.util.Locale; 99import java.util.concurrent.CopyOnWriteArrayList; 100import java.util.concurrent.atomic.AtomicInteger; 101 102/** 103 * <p> 104 * This class represents the basic building block for user interface components. A View 105 * occupies a rectangular area on the screen and is responsible for drawing and 106 * event handling. View is the base class for <em>widgets</em>, which are 107 * used to create interactive UI components (buttons, text fields, etc.). The 108 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 109 * are invisible containers that hold other Views (or other ViewGroups) and define 110 * their layout properties. 111 * </p> 112 * 113 * <div class="special reference"> 114 * <h3>Developer Guides</h3> 115 * <p>For information about using this class to develop your application's user interface, 116 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 117 * </div> 118 * 119 * <a name="Using"></a> 120 * <h3>Using Views</h3> 121 * <p> 122 * All of the views in a window are arranged in a single tree. You can add views 123 * either from code or by specifying a tree of views in one or more XML layout 124 * files. There are many specialized subclasses of views that act as controls or 125 * are capable of displaying text, images, or other content. 126 * </p> 127 * <p> 128 * Once you have created a tree of views, there are typically a few types of 129 * common operations you may wish to perform: 130 * <ul> 131 * <li><strong>Set properties:</strong> for example setting the text of a 132 * {@link android.widget.TextView}. The available properties and the methods 133 * that set them will vary among the different subclasses of views. Note that 134 * properties that are known at build time can be set in the XML layout 135 * files.</li> 136 * <li><strong>Set focus:</strong> The framework will handled moving focus in 137 * response to user input. To force focus to a specific view, call 138 * {@link #requestFocus}.</li> 139 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 140 * that will be notified when something interesting happens to the view. For 141 * example, all views will let you set a listener to be notified when the view 142 * gains or loses focus. You can register such a listener using 143 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 144 * Other view subclasses offer more specialized listeners. For example, a Button 145 * exposes a listener to notify clients when the button is clicked.</li> 146 * <li><strong>Set visibility:</strong> You can hide or show views using 147 * {@link #setVisibility(int)}.</li> 148 * </ul> 149 * </p> 150 * <p><em> 151 * Note: The Android framework is responsible for measuring, laying out and 152 * drawing views. You should not call methods that perform these actions on 153 * views yourself unless you are actually implementing a 154 * {@link android.view.ViewGroup}. 155 * </em></p> 156 * 157 * <a name="Lifecycle"></a> 158 * <h3>Implementing a Custom View</h3> 159 * 160 * <p> 161 * To implement a custom view, you will usually begin by providing overrides for 162 * some of the standard methods that the framework calls on all views. You do 163 * not need to override all of these methods. In fact, you can start by just 164 * overriding {@link #onDraw(android.graphics.Canvas)}. 165 * <table border="2" width="85%" align="center" cellpadding="5"> 166 * <thead> 167 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 168 * </thead> 169 * 170 * <tbody> 171 * <tr> 172 * <td rowspan="2">Creation</td> 173 * <td>Constructors</td> 174 * <td>There is a form of the constructor that are called when the view 175 * is created from code and a form that is called when the view is 176 * inflated from a layout file. The second form should parse and apply 177 * any attributes defined in the layout file. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onFinishInflate()}</code></td> 182 * <td>Called after a view and all of its children has been inflated 183 * from XML.</td> 184 * </tr> 185 * 186 * <tr> 187 * <td rowspan="3">Layout</td> 188 * <td><code>{@link #onMeasure(int, int)}</code></td> 189 * <td>Called to determine the size requirements for this view and all 190 * of its children. 191 * </td> 192 * </tr> 193 * <tr> 194 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 195 * <td>Called when this view should assign a size and position to all 196 * of its children. 197 * </td> 198 * </tr> 199 * <tr> 200 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 201 * <td>Called when the size of this view has changed. 202 * </td> 203 * </tr> 204 * 205 * <tr> 206 * <td>Drawing</td> 207 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 208 * <td>Called when the view should render its content. 209 * </td> 210 * </tr> 211 * 212 * <tr> 213 * <td rowspan="4">Event processing</td> 214 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 215 * <td>Called when a new hardware key event occurs. 216 * </td> 217 * </tr> 218 * <tr> 219 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 220 * <td>Called when a hardware key up event occurs. 221 * </td> 222 * </tr> 223 * <tr> 224 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 225 * <td>Called when a trackball motion event occurs. 226 * </td> 227 * </tr> 228 * <tr> 229 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 230 * <td>Called when a touch screen motion event occurs. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="2">Focus</td> 236 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 237 * <td>Called when the view gains or loses focus. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 243 * <td>Called when the window containing the view gains or loses focus. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td rowspan="3">Attaching</td> 249 * <td><code>{@link #onAttachedToWindow()}</code></td> 250 * <td>Called when the view is attached to a window. 251 * </td> 252 * </tr> 253 * 254 * <tr> 255 * <td><code>{@link #onDetachedFromWindow}</code></td> 256 * <td>Called when the view is detached from its window. 257 * </td> 258 * </tr> 259 * 260 * <tr> 261 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 262 * <td>Called when the visibility of the window containing the view 263 * has changed. 264 * </td> 265 * </tr> 266 * </tbody> 267 * 268 * </table> 269 * </p> 270 * 271 * <a name="IDs"></a> 272 * <h3>IDs</h3> 273 * Views may have an integer id associated with them. These ids are typically 274 * assigned in the layout XML files, and are used to find specific views within 275 * the view tree. A common pattern is to: 276 * <ul> 277 * <li>Define a Button in the layout file and assign it a unique ID. 278 * <pre> 279 * <Button 280 * android:id="@+id/my_button" 281 * android:layout_width="wrap_content" 282 * android:layout_height="wrap_content" 283 * android:text="@string/my_button_text"/> 284 * </pre></li> 285 * <li>From the onCreate method of an Activity, find the Button 286 * <pre class="prettyprint"> 287 * Button myButton = (Button) findViewById(R.id.my_button); 288 * </pre></li> 289 * </ul> 290 * <p> 291 * View IDs need not be unique throughout the tree, but it is good practice to 292 * ensure that they are at least unique within the part of the tree you are 293 * searching. 294 * </p> 295 * 296 * <a name="Position"></a> 297 * <h3>Position</h3> 298 * <p> 299 * The geometry of a view is that of a rectangle. A view has a location, 300 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 301 * two dimensions, expressed as a width and a height. The unit for location 302 * and dimensions is the pixel. 303 * </p> 304 * 305 * <p> 306 * It is possible to retrieve the location of a view by invoking the methods 307 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 308 * coordinate of the rectangle representing the view. The latter returns the 309 * top, or Y, coordinate of the rectangle representing the view. These methods 310 * both return the location of the view relative to its parent. For instance, 311 * when getLeft() returns 20, that means the view is located 20 pixels to the 312 * right of the left edge of its direct parent. 313 * </p> 314 * 315 * <p> 316 * In addition, several convenience methods are offered to avoid unnecessary 317 * computations, namely {@link #getRight()} and {@link #getBottom()}. 318 * These methods return the coordinates of the right and bottom edges of the 319 * rectangle representing the view. For instance, calling {@link #getRight()} 320 * is similar to the following computation: <code>getLeft() + getWidth()</code> 321 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 322 * </p> 323 * 324 * <a name="SizePaddingMargins"></a> 325 * <h3>Size, padding and margins</h3> 326 * <p> 327 * The size of a view is expressed with a width and a height. A view actually 328 * possess two pairs of width and height values. 329 * </p> 330 * 331 * <p> 332 * The first pair is known as <em>measured width</em> and 333 * <em>measured height</em>. These dimensions define how big a view wants to be 334 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 335 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 336 * and {@link #getMeasuredHeight()}. 337 * </p> 338 * 339 * <p> 340 * The second pair is simply known as <em>width</em> and <em>height</em>, or 341 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 342 * dimensions define the actual size of the view on screen, at drawing time and 343 * after layout. These values may, but do not have to, be different from the 344 * measured width and height. The width and height can be obtained by calling 345 * {@link #getWidth()} and {@link #getHeight()}. 346 * </p> 347 * 348 * <p> 349 * To measure its dimensions, a view takes into account its padding. The padding 350 * is expressed in pixels for the left, top, right and bottom parts of the view. 351 * Padding can be used to offset the content of the view by a specific amount of 352 * pixels. For instance, a left padding of 2 will push the view's content by 353 * 2 pixels to the right of the left edge. Padding can be set using the 354 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 355 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 356 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 357 * {@link #getPaddingEnd()}. 358 * </p> 359 * 360 * <p> 361 * Even though a view can define a padding, it does not provide any support for 362 * margins. However, view groups provide such a support. Refer to 363 * {@link android.view.ViewGroup} and 364 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 365 * </p> 366 * 367 * <a name="Layout"></a> 368 * <h3>Layout</h3> 369 * <p> 370 * Layout is a two pass process: a measure pass and a layout pass. The measuring 371 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 372 * of the view tree. Each view pushes dimension specifications down the tree 373 * during the recursion. At the end of the measure pass, every view has stored 374 * its measurements. The second pass happens in 375 * {@link #layout(int,int,int,int)} and is also top-down. During 376 * this pass each parent is responsible for positioning all of its children 377 * using the sizes computed in the measure pass. 378 * </p> 379 * 380 * <p> 381 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 382 * {@link #getMeasuredHeight()} values must be set, along with those for all of 383 * that view's descendants. A view's measured width and measured height values 384 * must respect the constraints imposed by the view's parents. This guarantees 385 * that at the end of the measure pass, all parents accept all of their 386 * children's measurements. A parent view may call measure() more than once on 387 * its children. For example, the parent may measure each child once with 388 * unspecified dimensions to find out how big they want to be, then call 389 * measure() on them again with actual numbers if the sum of all the children's 390 * unconstrained sizes is too big or too small. 391 * </p> 392 * 393 * <p> 394 * The measure pass uses two classes to communicate dimensions. The 395 * {@link MeasureSpec} class is used by views to tell their parents how they 396 * want to be measured and positioned. The base LayoutParams class just 397 * describes how big the view wants to be for both width and height. For each 398 * dimension, it can specify one of: 399 * <ul> 400 * <li> an exact number 401 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 402 * (minus padding) 403 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 404 * enclose its content (plus padding). 405 * </ul> 406 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 407 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 408 * an X and Y value. 409 * </p> 410 * 411 * <p> 412 * MeasureSpecs are used to push requirements down the tree from parent to 413 * child. A MeasureSpec can be in one of three modes: 414 * <ul> 415 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 416 * of a child view. For example, a LinearLayout may call measure() on its child 417 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 418 * tall the child view wants to be given a width of 240 pixels. 419 * <li>EXACTLY: This is used by the parent to impose an exact size on the 420 * child. The child must use this size, and guarantee that all of its 421 * descendants will fit within this size. 422 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 423 * child. The child must gurantee that it and all of its descendants will fit 424 * within this size. 425 * </ul> 426 * </p> 427 * 428 * <p> 429 * To intiate a layout, call {@link #requestLayout}. This method is typically 430 * called by a view on itself when it believes that is can no longer fit within 431 * its current bounds. 432 * </p> 433 * 434 * <a name="Drawing"></a> 435 * <h3>Drawing</h3> 436 * <p> 437 * Drawing is handled by walking the tree and rendering each view that 438 * intersects the invalid region. Because the tree is traversed in-order, 439 * this means that parents will draw before (i.e., behind) their children, with 440 * siblings drawn in the order they appear in the tree. 441 * If you set a background drawable for a View, then the View will draw it for you 442 * before calling back to its <code>onDraw()</code> method. 443 * </p> 444 * 445 * <p> 446 * Note that the framework will not draw views that are not in the invalid region. 447 * </p> 448 * 449 * <p> 450 * To force a view to draw, call {@link #invalidate()}. 451 * </p> 452 * 453 * <a name="EventHandlingThreading"></a> 454 * <h3>Event Handling and Threading</h3> 455 * <p> 456 * The basic cycle of a view is as follows: 457 * <ol> 458 * <li>An event comes in and is dispatched to the appropriate view. The view 459 * handles the event and notifies any listeners.</li> 460 * <li>If in the course of processing the event, the view's bounds may need 461 * to be changed, the view will call {@link #requestLayout()}.</li> 462 * <li>Similarly, if in the course of processing the event the view's appearance 463 * may need to be changed, the view will call {@link #invalidate()}.</li> 464 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 465 * the framework will take care of measuring, laying out, and drawing the tree 466 * as appropriate.</li> 467 * </ol> 468 * </p> 469 * 470 * <p><em>Note: The entire view tree is single threaded. You must always be on 471 * the UI thread when calling any method on any view.</em> 472 * If you are doing work on other threads and want to update the state of a view 473 * from that thread, you should use a {@link Handler}. 474 * </p> 475 * 476 * <a name="FocusHandling"></a> 477 * <h3>Focus Handling</h3> 478 * <p> 479 * The framework will handle routine focus movement in response to user input. 480 * This includes changing the focus as views are removed or hidden, or as new 481 * views become available. Views indicate their willingness to take focus 482 * through the {@link #isFocusable} method. To change whether a view can take 483 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 484 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 485 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 486 * </p> 487 * <p> 488 * Focus movement is based on an algorithm which finds the nearest neighbor in a 489 * given direction. In rare cases, the default algorithm may not match the 490 * intended behavior of the developer. In these situations, you can provide 491 * explicit overrides by using these XML attributes in the layout file: 492 * <pre> 493 * nextFocusDown 494 * nextFocusLeft 495 * nextFocusRight 496 * nextFocusUp 497 * </pre> 498 * </p> 499 * 500 * 501 * <p> 502 * To get a particular view to take focus, call {@link #requestFocus()}. 503 * </p> 504 * 505 * <a name="TouchMode"></a> 506 * <h3>Touch Mode</h3> 507 * <p> 508 * When a user is navigating a user interface via directional keys such as a D-pad, it is 509 * necessary to give focus to actionable items such as buttons so the user can see 510 * what will take input. If the device has touch capabilities, however, and the user 511 * begins interacting with the interface by touching it, it is no longer necessary to 512 * always highlight, or give focus to, a particular view. This motivates a mode 513 * for interaction named 'touch mode'. 514 * </p> 515 * <p> 516 * For a touch capable device, once the user touches the screen, the device 517 * will enter touch mode. From this point onward, only views for which 518 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 519 * Other views that are touchable, like buttons, will not take focus when touched; they will 520 * only fire the on click listeners. 521 * </p> 522 * <p> 523 * Any time a user hits a directional key, such as a D-pad direction, the view device will 524 * exit touch mode, and find a view to take focus, so that the user may resume interacting 525 * with the user interface without touching the screen again. 526 * </p> 527 * <p> 528 * The touch mode state is maintained across {@link android.app.Activity}s. Call 529 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 530 * </p> 531 * 532 * <a name="Scrolling"></a> 533 * <h3>Scrolling</h3> 534 * <p> 535 * The framework provides basic support for views that wish to internally 536 * scroll their content. This includes keeping track of the X and Y scroll 537 * offset as well as mechanisms for drawing scrollbars. See 538 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 539 * {@link #awakenScrollBars()} for more details. 540 * </p> 541 * 542 * <a name="Tags"></a> 543 * <h3>Tags</h3> 544 * <p> 545 * Unlike IDs, tags are not used to identify views. Tags are essentially an 546 * extra piece of information that can be associated with a view. They are most 547 * often used as a convenience to store data related to views in the views 548 * themselves rather than by putting them in a separate structure. 549 * </p> 550 * 551 * <a name="Properties"></a> 552 * <h3>Properties</h3> 553 * <p> 554 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 555 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 556 * available both in the {@link Property} form as well as in similarly-named setter/getter 557 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 558 * be used to set persistent state associated with these rendering-related properties on the view. 559 * The properties and methods can also be used in conjunction with 560 * {@link android.animation.Animator Animator}-based animations, described more in the 561 * <a href="#Animation">Animation</a> section. 562 * </p> 563 * 564 * <a name="Animation"></a> 565 * <h3>Animation</h3> 566 * <p> 567 * Starting with Android 3.0, the preferred way of animating views is to use the 568 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 569 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 570 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 571 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 572 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 573 * makes animating these View properties particularly easy and efficient. 574 * </p> 575 * <p> 576 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 577 * You can attach an {@link Animation} object to a view using 578 * {@link #setAnimation(Animation)} or 579 * {@link #startAnimation(Animation)}. The animation can alter the scale, 580 * rotation, translation and alpha of a view over time. If the animation is 581 * attached to a view that has children, the animation will affect the entire 582 * subtree rooted by that node. When an animation is started, the framework will 583 * take care of redrawing the appropriate views until the animation completes. 584 * </p> 585 * 586 * <a name="Security"></a> 587 * <h3>Security</h3> 588 * <p> 589 * Sometimes it is essential that an application be able to verify that an action 590 * is being performed with the full knowledge and consent of the user, such as 591 * granting a permission request, making a purchase or clicking on an advertisement. 592 * Unfortunately, a malicious application could try to spoof the user into 593 * performing these actions, unaware, by concealing the intended purpose of the view. 594 * As a remedy, the framework offers a touch filtering mechanism that can be used to 595 * improve the security of views that provide access to sensitive functionality. 596 * </p><p> 597 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 598 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 599 * will discard touches that are received whenever the view's window is obscured by 600 * another visible window. As a result, the view will not receive touches whenever a 601 * toast, dialog or other window appears above the view's window. 602 * </p><p> 603 * For more fine-grained control over security, consider overriding the 604 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 605 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 606 * </p> 607 * 608 * @attr ref android.R.styleable#View_alpha 609 * @attr ref android.R.styleable#View_background 610 * @attr ref android.R.styleable#View_clickable 611 * @attr ref android.R.styleable#View_contentDescription 612 * @attr ref android.R.styleable#View_drawingCacheQuality 613 * @attr ref android.R.styleable#View_duplicateParentState 614 * @attr ref android.R.styleable#View_id 615 * @attr ref android.R.styleable#View_requiresFadingEdge 616 * @attr ref android.R.styleable#View_fadeScrollbars 617 * @attr ref android.R.styleable#View_fadingEdgeLength 618 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 619 * @attr ref android.R.styleable#View_fitsSystemWindows 620 * @attr ref android.R.styleable#View_isScrollContainer 621 * @attr ref android.R.styleable#View_focusable 622 * @attr ref android.R.styleable#View_focusableInTouchMode 623 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 624 * @attr ref android.R.styleable#View_keepScreenOn 625 * @attr ref android.R.styleable#View_layerType 626 * @attr ref android.R.styleable#View_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_transformPivotX 664 * @attr ref android.R.styleable#View_transformPivotY 665 * @attr ref android.R.styleable#View_translationX 666 * @attr ref android.R.styleable#View_translationY 667 * @attr ref android.R.styleable#View_visibility 668 * 669 * @see android.view.ViewGroup 670 */ 671public class View implements Drawable.Callback, KeyEvent.Callback, 672 AccessibilityEventSource { 673 private static final boolean DBG = false; 674 675 /** 676 * The logging tag used by this class with android.util.Log. 677 */ 678 protected static final String VIEW_LOG_TAG = "View"; 679 680 /** 681 * When set to true, apps will draw debugging information about their layouts. 682 * 683 * @hide 684 */ 685 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 686 687 /** 688 * Used to mark a View that has no ID. 689 */ 690 public static final int NO_ID = -1; 691 692 /** 693 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 694 * calling setFlags. 695 */ 696 private static final int NOT_FOCUSABLE = 0x00000000; 697 698 /** 699 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 700 * setFlags. 701 */ 702 private static final int FOCUSABLE = 0x00000001; 703 704 /** 705 * Mask for use with setFlags indicating bits used for focus. 706 */ 707 private static final int FOCUSABLE_MASK = 0x00000001; 708 709 /** 710 * This view will adjust its padding to fit sytem windows (e.g. status bar) 711 */ 712 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 713 714 /** 715 * This view is visible. 716 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 717 * android:visibility}. 718 */ 719 public static final int VISIBLE = 0x00000000; 720 721 /** 722 * This view is invisible, but it still takes up space for layout purposes. 723 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 724 * android:visibility}. 725 */ 726 public static final int INVISIBLE = 0x00000004; 727 728 /** 729 * This view is invisible, and it doesn't take any space for layout 730 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 731 * android:visibility}. 732 */ 733 public static final int GONE = 0x00000008; 734 735 /** 736 * Mask for use with setFlags indicating bits used for visibility. 737 * {@hide} 738 */ 739 static final int VISIBILITY_MASK = 0x0000000C; 740 741 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 742 743 /** 744 * This view is enabled. Interpretation varies by subclass. 745 * Use with ENABLED_MASK when calling setFlags. 746 * {@hide} 747 */ 748 static final int ENABLED = 0x00000000; 749 750 /** 751 * This view is disabled. Interpretation varies by subclass. 752 * Use with ENABLED_MASK when calling setFlags. 753 * {@hide} 754 */ 755 static final int DISABLED = 0x00000020; 756 757 /** 758 * Mask for use with setFlags indicating bits used for indicating whether 759 * this view is enabled 760 * {@hide} 761 */ 762 static final int ENABLED_MASK = 0x00000020; 763 764 /** 765 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 766 * called and further optimizations will be performed. It is okay to have 767 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 768 * {@hide} 769 */ 770 static final int WILL_NOT_DRAW = 0x00000080; 771 772 /** 773 * Mask for use with setFlags indicating bits used for indicating whether 774 * this view is will draw 775 * {@hide} 776 */ 777 static final int DRAW_MASK = 0x00000080; 778 779 /** 780 * <p>This view doesn't show scrollbars.</p> 781 * {@hide} 782 */ 783 static final int SCROLLBARS_NONE = 0x00000000; 784 785 /** 786 * <p>This view shows horizontal scrollbars.</p> 787 * {@hide} 788 */ 789 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 790 791 /** 792 * <p>This view shows vertical scrollbars.</p> 793 * {@hide} 794 */ 795 static final int SCROLLBARS_VERTICAL = 0x00000200; 796 797 /** 798 * <p>Mask for use with setFlags indicating bits used for indicating which 799 * scrollbars are enabled.</p> 800 * {@hide} 801 */ 802 static final int SCROLLBARS_MASK = 0x00000300; 803 804 /** 805 * Indicates that the view should filter touches when its window is obscured. 806 * Refer to the class comments for more information about this security feature. 807 * {@hide} 808 */ 809 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 810 811 /** 812 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 813 * that they are optional and should be skipped if the window has 814 * requested system UI flags that ignore those insets for layout. 815 */ 816 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 817 818 /** 819 * <p>This view doesn't show fading edges.</p> 820 * {@hide} 821 */ 822 static final int FADING_EDGE_NONE = 0x00000000; 823 824 /** 825 * <p>This view shows horizontal fading edges.</p> 826 * {@hide} 827 */ 828 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 829 830 /** 831 * <p>This view shows vertical fading edges.</p> 832 * {@hide} 833 */ 834 static final int FADING_EDGE_VERTICAL = 0x00002000; 835 836 /** 837 * <p>Mask for use with setFlags indicating bits used for indicating which 838 * fading edges are enabled.</p> 839 * {@hide} 840 */ 841 static final int FADING_EDGE_MASK = 0x00003000; 842 843 /** 844 * <p>Indicates this view can be clicked. When clickable, a View reacts 845 * to clicks by notifying the OnClickListener.<p> 846 * {@hide} 847 */ 848 static final int CLICKABLE = 0x00004000; 849 850 /** 851 * <p>Indicates this view is caching its drawing into a bitmap.</p> 852 * {@hide} 853 */ 854 static final int DRAWING_CACHE_ENABLED = 0x00008000; 855 856 /** 857 * <p>Indicates that no icicle should be saved for this view.<p> 858 * {@hide} 859 */ 860 static final int SAVE_DISABLED = 0x000010000; 861 862 /** 863 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 864 * property.</p> 865 * {@hide} 866 */ 867 static final int SAVE_DISABLED_MASK = 0x000010000; 868 869 /** 870 * <p>Indicates that no drawing cache should ever be created for this view.<p> 871 * {@hide} 872 */ 873 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 874 875 /** 876 * <p>Indicates this view can take / keep focus when int touch mode.</p> 877 * {@hide} 878 */ 879 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 880 881 /** 882 * <p>Enables low quality mode for the drawing cache.</p> 883 */ 884 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 885 886 /** 887 * <p>Enables high quality mode for the drawing cache.</p> 888 */ 889 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 890 891 /** 892 * <p>Enables automatic quality mode for the drawing cache.</p> 893 */ 894 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 895 896 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 897 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 898 }; 899 900 /** 901 * <p>Mask for use with setFlags indicating bits used for the cache 902 * quality property.</p> 903 * {@hide} 904 */ 905 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 906 907 /** 908 * <p> 909 * Indicates this view can be long clicked. When long clickable, a View 910 * reacts to long clicks by notifying the OnLongClickListener or showing a 911 * context menu. 912 * </p> 913 * {@hide} 914 */ 915 static final int LONG_CLICKABLE = 0x00200000; 916 917 /** 918 * <p>Indicates that this view gets its drawable states from its direct parent 919 * and ignores its original internal states.</p> 920 * 921 * @hide 922 */ 923 static final int DUPLICATE_PARENT_STATE = 0x00400000; 924 925 /** 926 * The scrollbar style to display the scrollbars inside the content area, 927 * without increasing the padding. The scrollbars will be overlaid with 928 * translucency on the view's content. 929 */ 930 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 931 932 /** 933 * The scrollbar style to display the scrollbars inside the padded area, 934 * increasing the padding of the view. The scrollbars will not overlap the 935 * content area of the view. 936 */ 937 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 938 939 /** 940 * The scrollbar style to display the scrollbars at the edge of the view, 941 * without increasing the padding. The scrollbars will be overlaid with 942 * translucency. 943 */ 944 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 945 946 /** 947 * The scrollbar style to display the scrollbars at the edge of the view, 948 * increasing the padding of the view. The scrollbars will only overlap the 949 * background, if any. 950 */ 951 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 952 953 /** 954 * Mask to check if the scrollbar style is overlay or inset. 955 * {@hide} 956 */ 957 static final int SCROLLBARS_INSET_MASK = 0x01000000; 958 959 /** 960 * Mask to check if the scrollbar style is inside or outside. 961 * {@hide} 962 */ 963 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 964 965 /** 966 * Mask for scrollbar style. 967 * {@hide} 968 */ 969 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 970 971 /** 972 * View flag indicating that the screen should remain on while the 973 * window containing this view is visible to the user. This effectively 974 * takes care of automatically setting the WindowManager's 975 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 976 */ 977 public static final int KEEP_SCREEN_ON = 0x04000000; 978 979 /** 980 * View flag indicating whether this view should have sound effects enabled 981 * for events such as clicking and touching. 982 */ 983 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 984 985 /** 986 * View flag indicating whether this view should have haptic feedback 987 * enabled for events such as long presses. 988 */ 989 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 990 991 /** 992 * <p>Indicates that the view hierarchy should stop saving state when 993 * it reaches this view. If state saving is initiated immediately at 994 * the view, it will be allowed. 995 * {@hide} 996 */ 997 static final int PARENT_SAVE_DISABLED = 0x20000000; 998 999 /** 1000 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1001 * {@hide} 1002 */ 1003 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1004 1005 /** 1006 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1007 * should add all focusable Views regardless if they are focusable in touch mode. 1008 */ 1009 public static final int FOCUSABLES_ALL = 0x00000000; 1010 1011 /** 1012 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1013 * should add only Views focusable in touch mode. 1014 */ 1015 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1016 1017 /** 1018 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1019 * item. 1020 */ 1021 public static final int FOCUS_BACKWARD = 0x00000001; 1022 1023 /** 1024 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1025 * item. 1026 */ 1027 public static final int FOCUS_FORWARD = 0x00000002; 1028 1029 /** 1030 * Use with {@link #focusSearch(int)}. Move focus to the left. 1031 */ 1032 public static final int FOCUS_LEFT = 0x00000011; 1033 1034 /** 1035 * Use with {@link #focusSearch(int)}. Move focus up. 1036 */ 1037 public static final int FOCUS_UP = 0x00000021; 1038 1039 /** 1040 * Use with {@link #focusSearch(int)}. Move focus to the right. 1041 */ 1042 public static final int FOCUS_RIGHT = 0x00000042; 1043 1044 /** 1045 * Use with {@link #focusSearch(int)}. Move focus down. 1046 */ 1047 public static final int FOCUS_DOWN = 0x00000082; 1048 1049 /** 1050 * Bits of {@link #getMeasuredWidthAndState()} and 1051 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1052 */ 1053 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1054 1055 /** 1056 * Bits of {@link #getMeasuredWidthAndState()} and 1057 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1058 */ 1059 public static final int MEASURED_STATE_MASK = 0xff000000; 1060 1061 /** 1062 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1063 * for functions that combine both width and height into a single int, 1064 * such as {@link #getMeasuredState()} and the childState argument of 1065 * {@link #resolveSizeAndState(int, int, int)}. 1066 */ 1067 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1068 1069 /** 1070 * Bit of {@link #getMeasuredWidthAndState()} and 1071 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1072 * is smaller that the space the view would like to have. 1073 */ 1074 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1075 1076 /** 1077 * Base View state sets 1078 */ 1079 // Singles 1080 /** 1081 * Indicates the view has no states set. States are used with 1082 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1083 * view depending on its state. 1084 * 1085 * @see android.graphics.drawable.Drawable 1086 * @see #getDrawableState() 1087 */ 1088 protected static final int[] EMPTY_STATE_SET; 1089 /** 1090 * Indicates the view is enabled. States are used with 1091 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1092 * view depending on its state. 1093 * 1094 * @see android.graphics.drawable.Drawable 1095 * @see #getDrawableState() 1096 */ 1097 protected static final int[] ENABLED_STATE_SET; 1098 /** 1099 * Indicates the view is focused. States are used with 1100 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1101 * view depending on its state. 1102 * 1103 * @see android.graphics.drawable.Drawable 1104 * @see #getDrawableState() 1105 */ 1106 protected static final int[] FOCUSED_STATE_SET; 1107 /** 1108 * Indicates the view is selected. States are used with 1109 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1110 * view depending on its state. 1111 * 1112 * @see android.graphics.drawable.Drawable 1113 * @see #getDrawableState() 1114 */ 1115 protected static final int[] SELECTED_STATE_SET; 1116 /** 1117 * Indicates the view is pressed. States are used with 1118 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1119 * view depending on its state. 1120 * 1121 * @see android.graphics.drawable.Drawable 1122 * @see #getDrawableState() 1123 * @hide 1124 */ 1125 protected static final int[] PRESSED_STATE_SET; 1126 /** 1127 * Indicates the view's window has focus. States are used with 1128 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1129 * view depending on its state. 1130 * 1131 * @see android.graphics.drawable.Drawable 1132 * @see #getDrawableState() 1133 */ 1134 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1135 // Doubles 1136 /** 1137 * Indicates the view is enabled and has the focus. 1138 * 1139 * @see #ENABLED_STATE_SET 1140 * @see #FOCUSED_STATE_SET 1141 */ 1142 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1143 /** 1144 * Indicates the view is enabled and selected. 1145 * 1146 * @see #ENABLED_STATE_SET 1147 * @see #SELECTED_STATE_SET 1148 */ 1149 protected static final int[] ENABLED_SELECTED_STATE_SET; 1150 /** 1151 * Indicates the view is enabled and that its window has focus. 1152 * 1153 * @see #ENABLED_STATE_SET 1154 * @see #WINDOW_FOCUSED_STATE_SET 1155 */ 1156 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1157 /** 1158 * Indicates the view is focused and selected. 1159 * 1160 * @see #FOCUSED_STATE_SET 1161 * @see #SELECTED_STATE_SET 1162 */ 1163 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1164 /** 1165 * Indicates the view has the focus and that its window has the focus. 1166 * 1167 * @see #FOCUSED_STATE_SET 1168 * @see #WINDOW_FOCUSED_STATE_SET 1169 */ 1170 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1171 /** 1172 * Indicates the view is selected and that its window has the focus. 1173 * 1174 * @see #SELECTED_STATE_SET 1175 * @see #WINDOW_FOCUSED_STATE_SET 1176 */ 1177 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1178 // Triples 1179 /** 1180 * Indicates the view is enabled, focused and selected. 1181 * 1182 * @see #ENABLED_STATE_SET 1183 * @see #FOCUSED_STATE_SET 1184 * @see #SELECTED_STATE_SET 1185 */ 1186 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1187 /** 1188 * Indicates the view is enabled, focused and its window has the focus. 1189 * 1190 * @see #ENABLED_STATE_SET 1191 * @see #FOCUSED_STATE_SET 1192 * @see #WINDOW_FOCUSED_STATE_SET 1193 */ 1194 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1195 /** 1196 * Indicates the view is enabled, selected and its window has the focus. 1197 * 1198 * @see #ENABLED_STATE_SET 1199 * @see #SELECTED_STATE_SET 1200 * @see #WINDOW_FOCUSED_STATE_SET 1201 */ 1202 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1203 /** 1204 * Indicates the view is focused, selected and its window has the focus. 1205 * 1206 * @see #FOCUSED_STATE_SET 1207 * @see #SELECTED_STATE_SET 1208 * @see #WINDOW_FOCUSED_STATE_SET 1209 */ 1210 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1211 /** 1212 * Indicates the view is enabled, focused, selected and its window 1213 * has the focus. 1214 * 1215 * @see #ENABLED_STATE_SET 1216 * @see #FOCUSED_STATE_SET 1217 * @see #SELECTED_STATE_SET 1218 * @see #WINDOW_FOCUSED_STATE_SET 1219 */ 1220 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1221 /** 1222 * Indicates the view is pressed and its window has the focus. 1223 * 1224 * @see #PRESSED_STATE_SET 1225 * @see #WINDOW_FOCUSED_STATE_SET 1226 */ 1227 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1228 /** 1229 * Indicates the view is pressed and selected. 1230 * 1231 * @see #PRESSED_STATE_SET 1232 * @see #SELECTED_STATE_SET 1233 */ 1234 protected static final int[] PRESSED_SELECTED_STATE_SET; 1235 /** 1236 * Indicates the view is pressed, selected and its window has the focus. 1237 * 1238 * @see #PRESSED_STATE_SET 1239 * @see #SELECTED_STATE_SET 1240 * @see #WINDOW_FOCUSED_STATE_SET 1241 */ 1242 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1243 /** 1244 * Indicates the view is pressed and focused. 1245 * 1246 * @see #PRESSED_STATE_SET 1247 * @see #FOCUSED_STATE_SET 1248 */ 1249 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1250 /** 1251 * Indicates the view is pressed, focused and its window has the focus. 1252 * 1253 * @see #PRESSED_STATE_SET 1254 * @see #FOCUSED_STATE_SET 1255 * @see #WINDOW_FOCUSED_STATE_SET 1256 */ 1257 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1258 /** 1259 * Indicates the view is pressed, focused and selected. 1260 * 1261 * @see #PRESSED_STATE_SET 1262 * @see #SELECTED_STATE_SET 1263 * @see #FOCUSED_STATE_SET 1264 */ 1265 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1266 /** 1267 * Indicates the view is pressed, focused, selected and its window has the focus. 1268 * 1269 * @see #PRESSED_STATE_SET 1270 * @see #FOCUSED_STATE_SET 1271 * @see #SELECTED_STATE_SET 1272 * @see #WINDOW_FOCUSED_STATE_SET 1273 */ 1274 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1275 /** 1276 * Indicates the view is pressed and enabled. 1277 * 1278 * @see #PRESSED_STATE_SET 1279 * @see #ENABLED_STATE_SET 1280 */ 1281 protected static final int[] PRESSED_ENABLED_STATE_SET; 1282 /** 1283 * Indicates the view is pressed, enabled and its window has the focus. 1284 * 1285 * @see #PRESSED_STATE_SET 1286 * @see #ENABLED_STATE_SET 1287 * @see #WINDOW_FOCUSED_STATE_SET 1288 */ 1289 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1290 /** 1291 * Indicates the view is pressed, enabled and selected. 1292 * 1293 * @see #PRESSED_STATE_SET 1294 * @see #ENABLED_STATE_SET 1295 * @see #SELECTED_STATE_SET 1296 */ 1297 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1298 /** 1299 * Indicates the view is pressed, enabled, selected and its window has the 1300 * focus. 1301 * 1302 * @see #PRESSED_STATE_SET 1303 * @see #ENABLED_STATE_SET 1304 * @see #SELECTED_STATE_SET 1305 * @see #WINDOW_FOCUSED_STATE_SET 1306 */ 1307 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1308 /** 1309 * Indicates the view is pressed, enabled and focused. 1310 * 1311 * @see #PRESSED_STATE_SET 1312 * @see #ENABLED_STATE_SET 1313 * @see #FOCUSED_STATE_SET 1314 */ 1315 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1316 /** 1317 * Indicates the view is pressed, enabled, focused and its window has the 1318 * focus. 1319 * 1320 * @see #PRESSED_STATE_SET 1321 * @see #ENABLED_STATE_SET 1322 * @see #FOCUSED_STATE_SET 1323 * @see #WINDOW_FOCUSED_STATE_SET 1324 */ 1325 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1326 /** 1327 * Indicates the view is pressed, enabled, focused and selected. 1328 * 1329 * @see #PRESSED_STATE_SET 1330 * @see #ENABLED_STATE_SET 1331 * @see #SELECTED_STATE_SET 1332 * @see #FOCUSED_STATE_SET 1333 */ 1334 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1335 /** 1336 * Indicates the view is pressed, enabled, focused, selected and its window 1337 * has the focus. 1338 * 1339 * @see #PRESSED_STATE_SET 1340 * @see #ENABLED_STATE_SET 1341 * @see #SELECTED_STATE_SET 1342 * @see #FOCUSED_STATE_SET 1343 * @see #WINDOW_FOCUSED_STATE_SET 1344 */ 1345 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1346 1347 /** 1348 * The order here is very important to {@link #getDrawableState()} 1349 */ 1350 private static final int[][] VIEW_STATE_SETS; 1351 1352 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1353 static final int VIEW_STATE_SELECTED = 1 << 1; 1354 static final int VIEW_STATE_FOCUSED = 1 << 2; 1355 static final int VIEW_STATE_ENABLED = 1 << 3; 1356 static final int VIEW_STATE_PRESSED = 1 << 4; 1357 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1358 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1359 static final int VIEW_STATE_HOVERED = 1 << 7; 1360 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1361 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1362 1363 static final int[] VIEW_STATE_IDS = new int[] { 1364 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1365 R.attr.state_selected, VIEW_STATE_SELECTED, 1366 R.attr.state_focused, VIEW_STATE_FOCUSED, 1367 R.attr.state_enabled, VIEW_STATE_ENABLED, 1368 R.attr.state_pressed, VIEW_STATE_PRESSED, 1369 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1370 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1371 R.attr.state_hovered, VIEW_STATE_HOVERED, 1372 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1373 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1374 }; 1375 1376 static { 1377 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1378 throw new IllegalStateException( 1379 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1380 } 1381 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1382 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1383 int viewState = R.styleable.ViewDrawableStates[i]; 1384 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1385 if (VIEW_STATE_IDS[j] == viewState) { 1386 orderedIds[i * 2] = viewState; 1387 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1388 } 1389 } 1390 } 1391 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1392 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1393 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1394 int numBits = Integer.bitCount(i); 1395 int[] set = new int[numBits]; 1396 int pos = 0; 1397 for (int j = 0; j < orderedIds.length; j += 2) { 1398 if ((i & orderedIds[j+1]) != 0) { 1399 set[pos++] = orderedIds[j]; 1400 } 1401 } 1402 VIEW_STATE_SETS[i] = set; 1403 } 1404 1405 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1406 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1407 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1408 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1409 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1410 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1411 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1413 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1415 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1417 | VIEW_STATE_FOCUSED]; 1418 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1419 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1421 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1423 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1425 | VIEW_STATE_ENABLED]; 1426 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1428 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1429 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1430 | VIEW_STATE_ENABLED]; 1431 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1433 | VIEW_STATE_ENABLED]; 1434 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1436 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1437 1438 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1439 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1440 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1441 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1443 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1445 | VIEW_STATE_PRESSED]; 1446 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1448 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1449 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1450 | VIEW_STATE_PRESSED]; 1451 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1453 | VIEW_STATE_PRESSED]; 1454 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1456 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1457 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1459 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1461 | VIEW_STATE_PRESSED]; 1462 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1464 | VIEW_STATE_PRESSED]; 1465 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1467 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1468 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1470 | VIEW_STATE_PRESSED]; 1471 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1473 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1476 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1477 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1479 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1480 | VIEW_STATE_PRESSED]; 1481 } 1482 1483 /** 1484 * Accessibility event types that are dispatched for text population. 1485 */ 1486 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1487 AccessibilityEvent.TYPE_VIEW_CLICKED 1488 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1489 | AccessibilityEvent.TYPE_VIEW_SELECTED 1490 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1491 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1492 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1493 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1494 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1495 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1496 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1497 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1498 1499 /** 1500 * Temporary Rect currently for use in setBackground(). This will probably 1501 * be extended in the future to hold our own class with more than just 1502 * a Rect. :) 1503 */ 1504 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1505 1506 /** 1507 * Map used to store views' tags. 1508 */ 1509 private SparseArray<Object> mKeyedTags; 1510 1511 /** 1512 * The next available accessibility id. 1513 */ 1514 private static int sNextAccessibilityViewId; 1515 1516 /** 1517 * The animation currently associated with this view. 1518 * @hide 1519 */ 1520 protected Animation mCurrentAnimation = null; 1521 1522 /** 1523 * Width as measured during measure pass. 1524 * {@hide} 1525 */ 1526 @ViewDebug.ExportedProperty(category = "measurement") 1527 int mMeasuredWidth; 1528 1529 /** 1530 * Height as measured during measure pass. 1531 * {@hide} 1532 */ 1533 @ViewDebug.ExportedProperty(category = "measurement") 1534 int mMeasuredHeight; 1535 1536 /** 1537 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1538 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1539 * its display list. This flag, used only when hw accelerated, allows us to clear the 1540 * flag while retaining this information until it's needed (at getDisplayList() time and 1541 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1542 * 1543 * {@hide} 1544 */ 1545 boolean mRecreateDisplayList = false; 1546 1547 /** 1548 * The view's identifier. 1549 * {@hide} 1550 * 1551 * @see #setId(int) 1552 * @see #getId() 1553 */ 1554 @ViewDebug.ExportedProperty(resolveId = true) 1555 int mID = NO_ID; 1556 1557 /** 1558 * The stable ID of this view for accessibility purposes. 1559 */ 1560 int mAccessibilityViewId = NO_ID; 1561 1562 /** 1563 * @hide 1564 */ 1565 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1566 1567 /** 1568 * The view's tag. 1569 * {@hide} 1570 * 1571 * @see #setTag(Object) 1572 * @see #getTag() 1573 */ 1574 protected Object mTag; 1575 1576 // for mPrivateFlags: 1577 /** {@hide} */ 1578 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1579 /** {@hide} */ 1580 static final int PFLAG_FOCUSED = 0x00000002; 1581 /** {@hide} */ 1582 static final int PFLAG_SELECTED = 0x00000004; 1583 /** {@hide} */ 1584 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1585 /** {@hide} */ 1586 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1587 /** {@hide} */ 1588 static final int PFLAG_DRAWN = 0x00000020; 1589 /** 1590 * When this flag is set, this view is running an animation on behalf of its 1591 * children and should therefore not cancel invalidate requests, even if they 1592 * lie outside of this view's bounds. 1593 * 1594 * {@hide} 1595 */ 1596 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1597 /** {@hide} */ 1598 static final int PFLAG_SKIP_DRAW = 0x00000080; 1599 /** {@hide} */ 1600 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1601 /** {@hide} */ 1602 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1603 /** {@hide} */ 1604 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1605 /** {@hide} */ 1606 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1607 /** {@hide} */ 1608 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1609 /** {@hide} */ 1610 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1611 1612 private static final int PFLAG_PRESSED = 0x00004000; 1613 1614 /** {@hide} */ 1615 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1616 /** 1617 * Flag used to indicate that this view should be drawn once more (and only once 1618 * more) after its animation has completed. 1619 * {@hide} 1620 */ 1621 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1622 1623 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1624 1625 /** 1626 * Indicates that the View returned true when onSetAlpha() was called and that 1627 * the alpha must be restored. 1628 * {@hide} 1629 */ 1630 static final int PFLAG_ALPHA_SET = 0x00040000; 1631 1632 /** 1633 * Set by {@link #setScrollContainer(boolean)}. 1634 */ 1635 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1636 1637 /** 1638 * Set by {@link #setScrollContainer(boolean)}. 1639 */ 1640 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1641 1642 /** 1643 * View flag indicating whether this view was invalidated (fully or partially.) 1644 * 1645 * @hide 1646 */ 1647 static final int PFLAG_DIRTY = 0x00200000; 1648 1649 /** 1650 * View flag indicating whether this view was invalidated by an opaque 1651 * invalidate request. 1652 * 1653 * @hide 1654 */ 1655 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1656 1657 /** 1658 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1659 * 1660 * @hide 1661 */ 1662 static final int PFLAG_DIRTY_MASK = 0x00600000; 1663 1664 /** 1665 * Indicates whether the background is opaque. 1666 * 1667 * @hide 1668 */ 1669 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1670 1671 /** 1672 * Indicates whether the scrollbars are opaque. 1673 * 1674 * @hide 1675 */ 1676 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1677 1678 /** 1679 * Indicates whether the view is opaque. 1680 * 1681 * @hide 1682 */ 1683 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1684 1685 /** 1686 * Indicates a prepressed state; 1687 * the short time between ACTION_DOWN and recognizing 1688 * a 'real' press. Prepressed is used to recognize quick taps 1689 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1690 * 1691 * @hide 1692 */ 1693 private static final int PFLAG_PREPRESSED = 0x02000000; 1694 1695 /** 1696 * Indicates whether the view is temporarily detached. 1697 * 1698 * @hide 1699 */ 1700 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1701 1702 /** 1703 * Indicates that we should awaken scroll bars once attached 1704 * 1705 * @hide 1706 */ 1707 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1708 1709 /** 1710 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1711 * @hide 1712 */ 1713 private static final int PFLAG_HOVERED = 0x10000000; 1714 1715 /** 1716 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1717 * for transform operations 1718 * 1719 * @hide 1720 */ 1721 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1722 1723 /** {@hide} */ 1724 static final int PFLAG_ACTIVATED = 0x40000000; 1725 1726 /** 1727 * Indicates that this view was specifically invalidated, not just dirtied because some 1728 * child view was invalidated. The flag is used to determine when we need to recreate 1729 * a view's display list (as opposed to just returning a reference to its existing 1730 * display list). 1731 * 1732 * @hide 1733 */ 1734 static final int PFLAG_INVALIDATED = 0x80000000; 1735 1736 /** 1737 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1738 * 1739 * -------|-------|-------|-------| 1740 * PFLAG2_TEXT_ALIGNMENT_FLAGS[0] 1741 * PFLAG2_TEXT_DIRECTION_FLAGS[0] 1742 * 1 PFLAG2_DRAG_CAN_ACCEPT 1743 * 1 PFLAG2_DRAG_HOVERED 1744 * 1 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT 1745 * 11 PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1746 * 1 1 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT 1747 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1748 * 11 1 PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 1749 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1750 * 1 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT 1751 * 1 1 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT 1752 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1753 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1754 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1755 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1756 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1757 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1758 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1759 * 111 PFLAG2_TEXT_DIRECTION_MASK 1760 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1761 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1762 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1763 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1764 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1765 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1766 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1767 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1768 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1769 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1770 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1771 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1772 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1773 * 11 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1774 * 1 PFLAG2_HAS_TRANSIENT_STATE 1775 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1776 * 1 PFLAG2_ACCESSIBILITY_STATE_CHANGED 1777 * 1 PFLAG2_VIEW_QUICK_REJECTED 1778 * 1 PFLAG2_PADDING_RESOLVED 1779 * -------|-------|-------|-------| 1780 */ 1781 1782 /** 1783 * Indicates that this view has reported that it can accept the current drag's content. 1784 * Cleared when the drag operation concludes. 1785 * @hide 1786 */ 1787 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1788 1789 /** 1790 * Indicates that this view is currently directly under the drag location in a 1791 * drag-and-drop operation involving content that it can accept. Cleared when 1792 * the drag exits the view, or when the drag operation concludes. 1793 * @hide 1794 */ 1795 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1796 1797 /** 1798 * Horizontal layout direction of this view is from Left to Right. 1799 * Use with {@link #setLayoutDirection}. 1800 */ 1801 public static final int LAYOUT_DIRECTION_LTR = 0; 1802 1803 /** 1804 * Horizontal layout direction of this view is from Right to Left. 1805 * Use with {@link #setLayoutDirection}. 1806 */ 1807 public static final int LAYOUT_DIRECTION_RTL = 1; 1808 1809 /** 1810 * Horizontal layout direction of this view is inherited from its parent. 1811 * Use with {@link #setLayoutDirection}. 1812 */ 1813 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1814 1815 /** 1816 * Horizontal layout direction of this view is from deduced from the default language 1817 * script for the locale. Use with {@link #setLayoutDirection}. 1818 */ 1819 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1820 1821 /** 1822 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1823 * @hide 1824 */ 1825 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1826 1827 /** 1828 * Mask for use with private flags indicating bits used for horizontal layout direction. 1829 * @hide 1830 */ 1831 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1832 1833 /** 1834 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1835 * right-to-left direction. 1836 * @hide 1837 */ 1838 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1839 1840 /** 1841 * Indicates whether the view horizontal layout direction has been resolved. 1842 * @hide 1843 */ 1844 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1845 1846 /** 1847 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1848 * @hide 1849 */ 1850 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1851 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1852 1853 /* 1854 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1855 * flag value. 1856 * @hide 1857 */ 1858 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1859 LAYOUT_DIRECTION_LTR, 1860 LAYOUT_DIRECTION_RTL, 1861 LAYOUT_DIRECTION_INHERIT, 1862 LAYOUT_DIRECTION_LOCALE 1863 }; 1864 1865 /** 1866 * Default horizontal layout direction. 1867 * @hide 1868 */ 1869 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1870 1871 /** 1872 * Indicates that the view is tracking some sort of transient state 1873 * that the app should not need to be aware of, but that the framework 1874 * should take special care to preserve. 1875 * 1876 * @hide 1877 */ 1878 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x1 << 22; 1879 1880 /** 1881 * Text direction is inherited thru {@link ViewGroup} 1882 */ 1883 public static final int TEXT_DIRECTION_INHERIT = 0; 1884 1885 /** 1886 * Text direction is using "first strong algorithm". The first strong directional character 1887 * determines the paragraph direction. If there is no strong directional character, the 1888 * paragraph direction is the view's resolved layout direction. 1889 */ 1890 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1891 1892 /** 1893 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1894 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1895 * If there are neither, the paragraph direction is the view's resolved layout direction. 1896 */ 1897 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1898 1899 /** 1900 * Text direction is forced to LTR. 1901 */ 1902 public static final int TEXT_DIRECTION_LTR = 3; 1903 1904 /** 1905 * Text direction is forced to RTL. 1906 */ 1907 public static final int TEXT_DIRECTION_RTL = 4; 1908 1909 /** 1910 * Text direction is coming from the system Locale. 1911 */ 1912 public static final int TEXT_DIRECTION_LOCALE = 5; 1913 1914 /** 1915 * Default text direction is inherited 1916 */ 1917 public static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1918 1919 /** 1920 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1921 * @hide 1922 */ 1923 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1924 1925 /** 1926 * Mask for use with private flags indicating bits used for text direction. 1927 * @hide 1928 */ 1929 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1930 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1931 1932 /** 1933 * Array of text direction flags for mapping attribute "textDirection" to correct 1934 * flag value. 1935 * @hide 1936 */ 1937 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1938 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1939 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1940 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1941 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1942 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1943 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1944 }; 1945 1946 /** 1947 * Indicates whether the view text direction has been resolved. 1948 * @hide 1949 */ 1950 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1951 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1952 1953 /** 1954 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1955 * @hide 1956 */ 1957 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1958 1959 /** 1960 * Mask for use with private flags indicating bits used for resolved text direction. 1961 * @hide 1962 */ 1963 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1964 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1965 1966 /** 1967 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1968 * @hide 1969 */ 1970 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1971 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1972 1973 /* 1974 * Default text alignment. The text alignment of this View is inherited from its parent. 1975 * Use with {@link #setTextAlignment(int)} 1976 */ 1977 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1978 1979 /** 1980 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1981 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1982 * 1983 * Use with {@link #setTextAlignment(int)} 1984 */ 1985 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1986 1987 /** 1988 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1989 * 1990 * Use with {@link #setTextAlignment(int)} 1991 */ 1992 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1993 1994 /** 1995 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1996 * 1997 * Use with {@link #setTextAlignment(int)} 1998 */ 1999 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2000 2001 /** 2002 * Center the paragraph, e.g. ALIGN_CENTER. 2003 * 2004 * Use with {@link #setTextAlignment(int)} 2005 */ 2006 public static final int TEXT_ALIGNMENT_CENTER = 4; 2007 2008 /** 2009 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2010 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2011 * 2012 * Use with {@link #setTextAlignment(int)} 2013 */ 2014 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2015 2016 /** 2017 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2018 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2019 * 2020 * Use with {@link #setTextAlignment(int)} 2021 */ 2022 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2023 2024 /** 2025 * Default text alignment is inherited 2026 */ 2027 public static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2028 2029 /** 2030 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2031 * @hide 2032 */ 2033 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2034 2035 /** 2036 * Mask for use with private flags indicating bits used for text alignment. 2037 * @hide 2038 */ 2039 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2040 2041 /** 2042 * Array of text direction flags for mapping attribute "textAlignment" to correct 2043 * flag value. 2044 * @hide 2045 */ 2046 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2047 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2048 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2049 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2050 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2051 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2052 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2053 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2054 }; 2055 2056 /** 2057 * Indicates whether the view text alignment has been resolved. 2058 * @hide 2059 */ 2060 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2061 2062 /** 2063 * Bit shift to get the resolved text alignment. 2064 * @hide 2065 */ 2066 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2067 2068 /** 2069 * Mask for use with private flags indicating bits used for text alignment. 2070 * @hide 2071 */ 2072 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2073 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2074 2075 /** 2076 * Indicates whether if the view text alignment has been resolved to gravity 2077 */ 2078 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2079 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2080 2081 // Accessiblity constants for mPrivateFlags2 2082 2083 /** 2084 * Shift for the bits in {@link #mPrivateFlags2} related to the 2085 * "importantForAccessibility" attribute. 2086 */ 2087 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2088 2089 /** 2090 * Automatically determine whether a view is important for accessibility. 2091 */ 2092 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2093 2094 /** 2095 * The view is important for accessibility. 2096 */ 2097 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2098 2099 /** 2100 * The view is not important for accessibility. 2101 */ 2102 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2103 2104 /** 2105 * The default whether the view is important for accessibility. 2106 */ 2107 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2108 2109 /** 2110 * Mask for obtainig the bits which specify how to determine 2111 * whether a view is important for accessibility. 2112 */ 2113 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2114 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2115 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2116 2117 /** 2118 * Flag indicating whether a view has accessibility focus. 2119 */ 2120 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x00000040 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2121 2122 /** 2123 * Flag indicating whether a view state for accessibility has changed. 2124 */ 2125 static final int PFLAG2_ACCESSIBILITY_STATE_CHANGED = 0x00000080 2126 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2127 2128 /** 2129 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2130 * is used to check whether later changes to the view's transform should invalidate the 2131 * view to force the quickReject test to run again. 2132 */ 2133 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2134 2135 /** 2136 * Flag indicating that start/end padding has been resolved into left/right padding 2137 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2138 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2139 * during measurement. In some special cases this is required such as when an adapter-based 2140 * view measures prospective children without attaching them to a window. 2141 */ 2142 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2143 2144 /** 2145 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2146 */ 2147 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2148 2149 /** 2150 * Group of bits indicating that RTL properties resolution is done. 2151 */ 2152 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2153 PFLAG2_TEXT_DIRECTION_RESOLVED | 2154 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2155 PFLAG2_PADDING_RESOLVED | 2156 PFLAG2_DRAWABLE_RESOLVED; 2157 2158 // There are a couple of flags left in mPrivateFlags2 2159 2160 /* End of masks for mPrivateFlags2 */ 2161 2162 /* Masks for mPrivateFlags3 */ 2163 2164 /** 2165 * Flag indicating that view has a transform animation set on it. This is used to track whether 2166 * an animation is cleared between successive frames, in order to tell the associated 2167 * DisplayList to clear its animation matrix. 2168 */ 2169 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2170 2171 /** 2172 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2173 * animation is cleared between successive frames, in order to tell the associated 2174 * DisplayList to restore its alpha value. 2175 */ 2176 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2177 2178 2179 /* End of masks for mPrivateFlags3 */ 2180 2181 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2182 2183 /** 2184 * Always allow a user to over-scroll this view, provided it is a 2185 * view that can scroll. 2186 * 2187 * @see #getOverScrollMode() 2188 * @see #setOverScrollMode(int) 2189 */ 2190 public static final int OVER_SCROLL_ALWAYS = 0; 2191 2192 /** 2193 * Allow a user to over-scroll this view only if the content is large 2194 * enough to meaningfully scroll, provided it is a view that can scroll. 2195 * 2196 * @see #getOverScrollMode() 2197 * @see #setOverScrollMode(int) 2198 */ 2199 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2200 2201 /** 2202 * Never allow a user to over-scroll this view. 2203 * 2204 * @see #getOverScrollMode() 2205 * @see #setOverScrollMode(int) 2206 */ 2207 public static final int OVER_SCROLL_NEVER = 2; 2208 2209 /** 2210 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2211 * requested the system UI (status bar) to be visible (the default). 2212 * 2213 * @see #setSystemUiVisibility(int) 2214 */ 2215 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2216 2217 /** 2218 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2219 * system UI to enter an unobtrusive "low profile" mode. 2220 * 2221 * <p>This is for use in games, book readers, video players, or any other 2222 * "immersive" application where the usual system chrome is deemed too distracting. 2223 * 2224 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2225 * 2226 * @see #setSystemUiVisibility(int) 2227 */ 2228 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2229 2230 /** 2231 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2232 * system navigation be temporarily hidden. 2233 * 2234 * <p>This is an even less obtrusive state than that called for by 2235 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2236 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2237 * those to disappear. This is useful (in conjunction with the 2238 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2239 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2240 * window flags) for displaying content using every last pixel on the display. 2241 * 2242 * <p>There is a limitation: because navigation controls are so important, the least user 2243 * interaction will cause them to reappear immediately. When this happens, both 2244 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2245 * so that both elements reappear at the same time. 2246 * 2247 * @see #setSystemUiVisibility(int) 2248 */ 2249 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2250 2251 /** 2252 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2253 * into the normal fullscreen mode so that its content can take over the screen 2254 * while still allowing the user to interact with the application. 2255 * 2256 * <p>This has the same visual effect as 2257 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2258 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2259 * meaning that non-critical screen decorations (such as the status bar) will be 2260 * hidden while the user is in the View's window, focusing the experience on 2261 * that content. Unlike the window flag, if you are using ActionBar in 2262 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2263 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2264 * hide the action bar. 2265 * 2266 * <p>This approach to going fullscreen is best used over the window flag when 2267 * it is a transient state -- that is, the application does this at certain 2268 * points in its user interaction where it wants to allow the user to focus 2269 * on content, but not as a continuous state. For situations where the application 2270 * would like to simply stay full screen the entire time (such as a game that 2271 * wants to take over the screen), the 2272 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2273 * is usually a better approach. The state set here will be removed by the system 2274 * in various situations (such as the user moving to another application) like 2275 * the other system UI states. 2276 * 2277 * <p>When using this flag, the application should provide some easy facility 2278 * for the user to go out of it. A common example would be in an e-book 2279 * reader, where tapping on the screen brings back whatever screen and UI 2280 * decorations that had been hidden while the user was immersed in reading 2281 * the book. 2282 * 2283 * @see #setSystemUiVisibility(int) 2284 */ 2285 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2286 2287 /** 2288 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2289 * flags, we would like a stable view of the content insets given to 2290 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2291 * will always represent the worst case that the application can expect 2292 * as a continuous state. In the stock Android UI this is the space for 2293 * the system bar, nav bar, and status bar, but not more transient elements 2294 * such as an input method. 2295 * 2296 * The stable layout your UI sees is based on the system UI modes you can 2297 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2298 * then you will get a stable layout for changes of the 2299 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2300 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2301 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2302 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2303 * with a stable layout. (Note that you should avoid using 2304 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2305 * 2306 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2307 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2308 * then a hidden status bar will be considered a "stable" state for purposes 2309 * here. This allows your UI to continually hide the status bar, while still 2310 * using the system UI flags to hide the action bar while still retaining 2311 * a stable layout. Note that changing the window fullscreen flag will never 2312 * provide a stable layout for a clean transition. 2313 * 2314 * <p>If you are using ActionBar in 2315 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2316 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2317 * insets it adds to those given to the application. 2318 */ 2319 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2320 2321 /** 2322 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2323 * to be layed out as if it has requested 2324 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2325 * allows it to avoid artifacts when switching in and out of that mode, at 2326 * the expense that some of its user interface may be covered by screen 2327 * decorations when they are shown. You can perform layout of your inner 2328 * UI elements to account for the navagation system UI through the 2329 * {@link #fitSystemWindows(Rect)} method. 2330 */ 2331 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2332 2333 /** 2334 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2335 * to be layed out as if it has requested 2336 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2337 * allows it to avoid artifacts when switching in and out of that mode, at 2338 * the expense that some of its user interface may be covered by screen 2339 * decorations when they are shown. You can perform layout of your inner 2340 * UI elements to account for non-fullscreen system UI through the 2341 * {@link #fitSystemWindows(Rect)} method. 2342 */ 2343 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2344 2345 /** 2346 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2347 */ 2348 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2349 2350 /** 2351 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2352 */ 2353 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2354 2355 /** 2356 * @hide 2357 * 2358 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2359 * out of the public fields to keep the undefined bits out of the developer's way. 2360 * 2361 * Flag to make the status bar not expandable. Unless you also 2362 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2363 */ 2364 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2365 2366 /** 2367 * @hide 2368 * 2369 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2370 * out of the public fields to keep the undefined bits out of the developer's way. 2371 * 2372 * Flag to hide notification icons and scrolling ticker text. 2373 */ 2374 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2375 2376 /** 2377 * @hide 2378 * 2379 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2380 * out of the public fields to keep the undefined bits out of the developer's way. 2381 * 2382 * Flag to disable incoming notification alerts. This will not block 2383 * icons, but it will block sound, vibrating and other visual or aural notifications. 2384 */ 2385 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2386 2387 /** 2388 * @hide 2389 * 2390 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2391 * out of the public fields to keep the undefined bits out of the developer's way. 2392 * 2393 * Flag to hide only the scrolling ticker. Note that 2394 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2395 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2396 */ 2397 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2398 2399 /** 2400 * @hide 2401 * 2402 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2403 * out of the public fields to keep the undefined bits out of the developer's way. 2404 * 2405 * Flag to hide the center system info area. 2406 */ 2407 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2408 2409 /** 2410 * @hide 2411 * 2412 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2413 * out of the public fields to keep the undefined bits out of the developer's way. 2414 * 2415 * Flag to hide only the home button. Don't use this 2416 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2417 */ 2418 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2419 2420 /** 2421 * @hide 2422 * 2423 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2424 * out of the public fields to keep the undefined bits out of the developer's way. 2425 * 2426 * Flag to hide only the back button. Don't use this 2427 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2428 */ 2429 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2430 2431 /** 2432 * @hide 2433 * 2434 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2435 * out of the public fields to keep the undefined bits out of the developer's way. 2436 * 2437 * Flag to hide only the clock. You might use this if your activity has 2438 * its own clock making the status bar's clock redundant. 2439 */ 2440 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2441 2442 /** 2443 * @hide 2444 * 2445 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2446 * out of the public fields to keep the undefined bits out of the developer's way. 2447 * 2448 * Flag to hide only the recent apps button. Don't use this 2449 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2450 */ 2451 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2452 2453 /** 2454 * @hide 2455 */ 2456 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2457 2458 /** 2459 * These are the system UI flags that can be cleared by events outside 2460 * of an application. Currently this is just the ability to tap on the 2461 * screen while hiding the navigation bar to have it return. 2462 * @hide 2463 */ 2464 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2465 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2466 | SYSTEM_UI_FLAG_FULLSCREEN; 2467 2468 /** 2469 * Flags that can impact the layout in relation to system UI. 2470 */ 2471 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2472 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2473 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2474 2475 /** 2476 * Find views that render the specified text. 2477 * 2478 * @see #findViewsWithText(ArrayList, CharSequence, int) 2479 */ 2480 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2481 2482 /** 2483 * Find find views that contain the specified content description. 2484 * 2485 * @see #findViewsWithText(ArrayList, CharSequence, int) 2486 */ 2487 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2488 2489 /** 2490 * Find views that contain {@link AccessibilityNodeProvider}. Such 2491 * a View is a root of virtual view hierarchy and may contain the searched 2492 * text. If this flag is set Views with providers are automatically 2493 * added and it is a responsibility of the client to call the APIs of 2494 * the provider to determine whether the virtual tree rooted at this View 2495 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2496 * represeting the virtual views with this text. 2497 * 2498 * @see #findViewsWithText(ArrayList, CharSequence, int) 2499 * 2500 * @hide 2501 */ 2502 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2503 2504 /** 2505 * The undefined cursor position. 2506 */ 2507 private static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2508 2509 /** 2510 * Indicates that the screen has changed state and is now off. 2511 * 2512 * @see #onScreenStateChanged(int) 2513 */ 2514 public static final int SCREEN_STATE_OFF = 0x0; 2515 2516 /** 2517 * Indicates that the screen has changed state and is now on. 2518 * 2519 * @see #onScreenStateChanged(int) 2520 */ 2521 public static final int SCREEN_STATE_ON = 0x1; 2522 2523 /** 2524 * Controls the over-scroll mode for this view. 2525 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2526 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2527 * and {@link #OVER_SCROLL_NEVER}. 2528 */ 2529 private int mOverScrollMode; 2530 2531 /** 2532 * The parent this view is attached to. 2533 * {@hide} 2534 * 2535 * @see #getParent() 2536 */ 2537 protected ViewParent mParent; 2538 2539 /** 2540 * {@hide} 2541 */ 2542 AttachInfo mAttachInfo; 2543 2544 /** 2545 * {@hide} 2546 */ 2547 @ViewDebug.ExportedProperty(flagMapping = { 2548 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2549 name = "FORCE_LAYOUT"), 2550 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2551 name = "LAYOUT_REQUIRED"), 2552 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2553 name = "DRAWING_CACHE_INVALID", outputIf = false), 2554 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2555 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2556 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2557 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2558 }) 2559 int mPrivateFlags; 2560 int mPrivateFlags2; 2561 int mPrivateFlags3; 2562 2563 /** 2564 * This view's request for the visibility of the status bar. 2565 * @hide 2566 */ 2567 @ViewDebug.ExportedProperty(flagMapping = { 2568 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2569 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2570 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2571 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2572 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2573 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2574 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2575 equals = SYSTEM_UI_FLAG_VISIBLE, 2576 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2577 }) 2578 int mSystemUiVisibility; 2579 2580 /** 2581 * Reference count for transient state. 2582 * @see #setHasTransientState(boolean) 2583 */ 2584 int mTransientStateCount = 0; 2585 2586 /** 2587 * Count of how many windows this view has been attached to. 2588 */ 2589 int mWindowAttachCount; 2590 2591 /** 2592 * The layout parameters associated with this view and used by the parent 2593 * {@link android.view.ViewGroup} to determine how this view should be 2594 * laid out. 2595 * {@hide} 2596 */ 2597 protected ViewGroup.LayoutParams mLayoutParams; 2598 2599 /** 2600 * The view flags hold various views states. 2601 * {@hide} 2602 */ 2603 @ViewDebug.ExportedProperty 2604 int mViewFlags; 2605 2606 static class TransformationInfo { 2607 /** 2608 * The transform matrix for the View. This transform is calculated internally 2609 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2610 * is used by default. Do *not* use this variable directly; instead call 2611 * getMatrix(), which will automatically recalculate the matrix if necessary 2612 * to get the correct matrix based on the latest rotation and scale properties. 2613 */ 2614 private final Matrix mMatrix = new Matrix(); 2615 2616 /** 2617 * The transform matrix for the View. This transform is calculated internally 2618 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2619 * is used by default. Do *not* use this variable directly; instead call 2620 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2621 * to get the correct matrix based on the latest rotation and scale properties. 2622 */ 2623 private Matrix mInverseMatrix; 2624 2625 /** 2626 * An internal variable that tracks whether we need to recalculate the 2627 * transform matrix, based on whether the rotation or scaleX/Y properties 2628 * have changed since the matrix was last calculated. 2629 */ 2630 boolean mMatrixDirty = false; 2631 2632 /** 2633 * An internal variable that tracks whether we need to recalculate the 2634 * transform matrix, based on whether the rotation or scaleX/Y properties 2635 * have changed since the matrix was last calculated. 2636 */ 2637 private boolean mInverseMatrixDirty = true; 2638 2639 /** 2640 * A variable that tracks whether we need to recalculate the 2641 * transform matrix, based on whether the rotation or scaleX/Y properties 2642 * have changed since the matrix was last calculated. This variable 2643 * is only valid after a call to updateMatrix() or to a function that 2644 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2645 */ 2646 private boolean mMatrixIsIdentity = true; 2647 2648 /** 2649 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2650 */ 2651 private Camera mCamera = null; 2652 2653 /** 2654 * This matrix is used when computing the matrix for 3D rotations. 2655 */ 2656 private Matrix matrix3D = null; 2657 2658 /** 2659 * These prev values are used to recalculate a centered pivot point when necessary. The 2660 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2661 * set), so thes values are only used then as well. 2662 */ 2663 private int mPrevWidth = -1; 2664 private int mPrevHeight = -1; 2665 2666 /** 2667 * The degrees rotation around the vertical axis through the pivot point. 2668 */ 2669 @ViewDebug.ExportedProperty 2670 float mRotationY = 0f; 2671 2672 /** 2673 * The degrees rotation around the horizontal axis through the pivot point. 2674 */ 2675 @ViewDebug.ExportedProperty 2676 float mRotationX = 0f; 2677 2678 /** 2679 * The degrees rotation around the pivot point. 2680 */ 2681 @ViewDebug.ExportedProperty 2682 float mRotation = 0f; 2683 2684 /** 2685 * The amount of translation of the object away from its left property (post-layout). 2686 */ 2687 @ViewDebug.ExportedProperty 2688 float mTranslationX = 0f; 2689 2690 /** 2691 * The amount of translation of the object away from its top property (post-layout). 2692 */ 2693 @ViewDebug.ExportedProperty 2694 float mTranslationY = 0f; 2695 2696 /** 2697 * The amount of scale in the x direction around the pivot point. A 2698 * value of 1 means no scaling is applied. 2699 */ 2700 @ViewDebug.ExportedProperty 2701 float mScaleX = 1f; 2702 2703 /** 2704 * The amount of scale in the y direction around the pivot point. A 2705 * value of 1 means no scaling is applied. 2706 */ 2707 @ViewDebug.ExportedProperty 2708 float mScaleY = 1f; 2709 2710 /** 2711 * The x location of the point around which the view is rotated and scaled. 2712 */ 2713 @ViewDebug.ExportedProperty 2714 float mPivotX = 0f; 2715 2716 /** 2717 * The y location of the point around which the view is rotated and scaled. 2718 */ 2719 @ViewDebug.ExportedProperty 2720 float mPivotY = 0f; 2721 2722 /** 2723 * The opacity of the View. This is a value from 0 to 1, where 0 means 2724 * completely transparent and 1 means completely opaque. 2725 */ 2726 @ViewDebug.ExportedProperty 2727 float mAlpha = 1f; 2728 } 2729 2730 TransformationInfo mTransformationInfo; 2731 2732 private boolean mLastIsOpaque; 2733 2734 /** 2735 * Convenience value to check for float values that are close enough to zero to be considered 2736 * zero. 2737 */ 2738 private static final float NONZERO_EPSILON = .001f; 2739 2740 /** 2741 * The distance in pixels from the left edge of this view's parent 2742 * to the left edge of this view. 2743 * {@hide} 2744 */ 2745 @ViewDebug.ExportedProperty(category = "layout") 2746 protected int mLeft; 2747 /** 2748 * The distance in pixels from the left edge of this view's parent 2749 * to the right edge of this view. 2750 * {@hide} 2751 */ 2752 @ViewDebug.ExportedProperty(category = "layout") 2753 protected int mRight; 2754 /** 2755 * The distance in pixels from the top edge of this view's parent 2756 * to the top edge of this view. 2757 * {@hide} 2758 */ 2759 @ViewDebug.ExportedProperty(category = "layout") 2760 protected int mTop; 2761 /** 2762 * The distance in pixels from the top edge of this view's parent 2763 * to the bottom edge of this view. 2764 * {@hide} 2765 */ 2766 @ViewDebug.ExportedProperty(category = "layout") 2767 protected int mBottom; 2768 2769 /** 2770 * The offset, in pixels, by which the content of this view is scrolled 2771 * horizontally. 2772 * {@hide} 2773 */ 2774 @ViewDebug.ExportedProperty(category = "scrolling") 2775 protected int mScrollX; 2776 /** 2777 * The offset, in pixels, by which the content of this view is scrolled 2778 * vertically. 2779 * {@hide} 2780 */ 2781 @ViewDebug.ExportedProperty(category = "scrolling") 2782 protected int mScrollY; 2783 2784 /** 2785 * The left padding in pixels, that is the distance in pixels between the 2786 * left edge of this view and the left edge of its content. 2787 * {@hide} 2788 */ 2789 @ViewDebug.ExportedProperty(category = "padding") 2790 protected int mPaddingLeft = 0; 2791 /** 2792 * The right padding in pixels, that is the distance in pixels between the 2793 * right edge of this view and the right edge of its content. 2794 * {@hide} 2795 */ 2796 @ViewDebug.ExportedProperty(category = "padding") 2797 protected int mPaddingRight = 0; 2798 /** 2799 * The top padding in pixels, that is the distance in pixels between the 2800 * top edge of this view and the top edge of its content. 2801 * {@hide} 2802 */ 2803 @ViewDebug.ExportedProperty(category = "padding") 2804 protected int mPaddingTop; 2805 /** 2806 * The bottom padding in pixels, that is the distance in pixels between the 2807 * bottom edge of this view and the bottom edge of its content. 2808 * {@hide} 2809 */ 2810 @ViewDebug.ExportedProperty(category = "padding") 2811 protected int mPaddingBottom; 2812 2813 /** 2814 * The layout insets in pixels, that is the distance in pixels between the 2815 * visible edges of this view its bounds. 2816 */ 2817 private Insets mLayoutInsets; 2818 2819 /** 2820 * Briefly describes the view and is primarily used for accessibility support. 2821 */ 2822 private CharSequence mContentDescription; 2823 2824 /** 2825 * Specifies the id of a view for which this view serves as a label for 2826 * accessibility purposes. 2827 */ 2828 private int mLabelForId = View.NO_ID; 2829 2830 /** 2831 * Predicate for matching labeled view id with its label for 2832 * accessibility purposes. 2833 */ 2834 private MatchLabelForPredicate mMatchLabelForPredicate; 2835 2836 /** 2837 * Predicate for matching a view by its id. 2838 */ 2839 private MatchIdPredicate mMatchIdPredicate; 2840 2841 /** 2842 * Cache the paddingRight set by the user to append to the scrollbar's size. 2843 * 2844 * @hide 2845 */ 2846 @ViewDebug.ExportedProperty(category = "padding") 2847 protected int mUserPaddingRight; 2848 2849 /** 2850 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2851 * 2852 * @hide 2853 */ 2854 @ViewDebug.ExportedProperty(category = "padding") 2855 protected int mUserPaddingBottom; 2856 2857 /** 2858 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2859 * 2860 * @hide 2861 */ 2862 @ViewDebug.ExportedProperty(category = "padding") 2863 protected int mUserPaddingLeft; 2864 2865 /** 2866 * Cache the paddingStart set by the user to append to the scrollbar's size. 2867 * 2868 */ 2869 @ViewDebug.ExportedProperty(category = "padding") 2870 int mUserPaddingStart; 2871 2872 /** 2873 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2874 * 2875 */ 2876 @ViewDebug.ExportedProperty(category = "padding") 2877 int mUserPaddingEnd; 2878 2879 /** 2880 * Cache initial left padding. 2881 * 2882 * @hide 2883 */ 2884 int mUserPaddingLeftInitial = 0; 2885 2886 /** 2887 * Cache initial right padding. 2888 * 2889 * @hide 2890 */ 2891 int mUserPaddingRightInitial = 0; 2892 2893 /** 2894 * Default undefined padding 2895 */ 2896 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 2897 2898 /** 2899 * @hide 2900 */ 2901 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2902 /** 2903 * @hide 2904 */ 2905 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2906 2907 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 2908 private Drawable mBackground; 2909 2910 private int mBackgroundResource; 2911 private boolean mBackgroundSizeChanged; 2912 2913 static class ListenerInfo { 2914 /** 2915 * Listener used to dispatch focus change events. 2916 * This field should be made private, so it is hidden from the SDK. 2917 * {@hide} 2918 */ 2919 protected OnFocusChangeListener mOnFocusChangeListener; 2920 2921 /** 2922 * Listeners for layout change events. 2923 */ 2924 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2925 2926 /** 2927 * Listeners for attach events. 2928 */ 2929 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2930 2931 /** 2932 * Listener used to dispatch click events. 2933 * This field should be made private, so it is hidden from the SDK. 2934 * {@hide} 2935 */ 2936 public OnClickListener mOnClickListener; 2937 2938 /** 2939 * Listener used to dispatch long click events. 2940 * This field should be made private, so it is hidden from the SDK. 2941 * {@hide} 2942 */ 2943 protected OnLongClickListener mOnLongClickListener; 2944 2945 /** 2946 * Listener used to build the context menu. 2947 * This field should be made private, so it is hidden from the SDK. 2948 * {@hide} 2949 */ 2950 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2951 2952 private OnKeyListener mOnKeyListener; 2953 2954 private OnTouchListener mOnTouchListener; 2955 2956 private OnHoverListener mOnHoverListener; 2957 2958 private OnGenericMotionListener mOnGenericMotionListener; 2959 2960 private OnDragListener mOnDragListener; 2961 2962 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2963 } 2964 2965 ListenerInfo mListenerInfo; 2966 2967 /** 2968 * The application environment this view lives in. 2969 * This field should be made private, so it is hidden from the SDK. 2970 * {@hide} 2971 */ 2972 protected Context mContext; 2973 2974 private final Resources mResources; 2975 2976 private ScrollabilityCache mScrollCache; 2977 2978 private int[] mDrawableState = null; 2979 2980 /** 2981 * Set to true when drawing cache is enabled and cannot be created. 2982 * 2983 * @hide 2984 */ 2985 public boolean mCachingFailed; 2986 2987 private Bitmap mDrawingCache; 2988 private Bitmap mUnscaledDrawingCache; 2989 private HardwareLayer mHardwareLayer; 2990 DisplayList mDisplayList; 2991 2992 /** 2993 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2994 * the user may specify which view to go to next. 2995 */ 2996 private int mNextFocusLeftId = View.NO_ID; 2997 2998 /** 2999 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3000 * the user may specify which view to go to next. 3001 */ 3002 private int mNextFocusRightId = View.NO_ID; 3003 3004 /** 3005 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3006 * the user may specify which view to go to next. 3007 */ 3008 private int mNextFocusUpId = View.NO_ID; 3009 3010 /** 3011 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3012 * the user may specify which view to go to next. 3013 */ 3014 private int mNextFocusDownId = View.NO_ID; 3015 3016 /** 3017 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3018 * the user may specify which view to go to next. 3019 */ 3020 int mNextFocusForwardId = View.NO_ID; 3021 3022 private CheckForLongPress mPendingCheckForLongPress; 3023 private CheckForTap mPendingCheckForTap = null; 3024 private PerformClick mPerformClick; 3025 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3026 3027 private UnsetPressedState mUnsetPressedState; 3028 3029 /** 3030 * Whether the long press's action has been invoked. The tap's action is invoked on the 3031 * up event while a long press is invoked as soon as the long press duration is reached, so 3032 * a long press could be performed before the tap is checked, in which case the tap's action 3033 * should not be invoked. 3034 */ 3035 private boolean mHasPerformedLongPress; 3036 3037 /** 3038 * The minimum height of the view. We'll try our best to have the height 3039 * of this view to at least this amount. 3040 */ 3041 @ViewDebug.ExportedProperty(category = "measurement") 3042 private int mMinHeight; 3043 3044 /** 3045 * The minimum width of the view. We'll try our best to have the width 3046 * of this view to at least this amount. 3047 */ 3048 @ViewDebug.ExportedProperty(category = "measurement") 3049 private int mMinWidth; 3050 3051 /** 3052 * The delegate to handle touch events that are physically in this view 3053 * but should be handled by another view. 3054 */ 3055 private TouchDelegate mTouchDelegate = null; 3056 3057 /** 3058 * Solid color to use as a background when creating the drawing cache. Enables 3059 * the cache to use 16 bit bitmaps instead of 32 bit. 3060 */ 3061 private int mDrawingCacheBackgroundColor = 0; 3062 3063 /** 3064 * Special tree observer used when mAttachInfo is null. 3065 */ 3066 private ViewTreeObserver mFloatingTreeObserver; 3067 3068 /** 3069 * Cache the touch slop from the context that created the view. 3070 */ 3071 private int mTouchSlop; 3072 3073 /** 3074 * Object that handles automatic animation of view properties. 3075 */ 3076 private ViewPropertyAnimator mAnimator = null; 3077 3078 /** 3079 * Flag indicating that a drag can cross window boundaries. When 3080 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3081 * with this flag set, all visible applications will be able to participate 3082 * in the drag operation and receive the dragged content. 3083 * 3084 * @hide 3085 */ 3086 public static final int DRAG_FLAG_GLOBAL = 1; 3087 3088 /** 3089 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3090 */ 3091 private float mVerticalScrollFactor; 3092 3093 /** 3094 * Position of the vertical scroll bar. 3095 */ 3096 private int mVerticalScrollbarPosition; 3097 3098 /** 3099 * Position the scroll bar at the default position as determined by the system. 3100 */ 3101 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3102 3103 /** 3104 * Position the scroll bar along the left edge. 3105 */ 3106 public static final int SCROLLBAR_POSITION_LEFT = 1; 3107 3108 /** 3109 * Position the scroll bar along the right edge. 3110 */ 3111 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3112 3113 /** 3114 * Indicates that the view does not have a layer. 3115 * 3116 * @see #getLayerType() 3117 * @see #setLayerType(int, android.graphics.Paint) 3118 * @see #LAYER_TYPE_SOFTWARE 3119 * @see #LAYER_TYPE_HARDWARE 3120 */ 3121 public static final int LAYER_TYPE_NONE = 0; 3122 3123 /** 3124 * <p>Indicates that the view has a software layer. A software layer is backed 3125 * by a bitmap and causes the view to be rendered using Android's software 3126 * rendering pipeline, even if hardware acceleration is enabled.</p> 3127 * 3128 * <p>Software layers have various usages:</p> 3129 * <p>When the application is not using hardware acceleration, a software layer 3130 * is useful to apply a specific color filter and/or blending mode and/or 3131 * translucency to a view and all its children.</p> 3132 * <p>When the application is using hardware acceleration, a software layer 3133 * is useful to render drawing primitives not supported by the hardware 3134 * accelerated pipeline. It can also be used to cache a complex view tree 3135 * into a texture and reduce the complexity of drawing operations. For instance, 3136 * when animating a complex view tree with a translation, a software layer can 3137 * be used to render the view tree only once.</p> 3138 * <p>Software layers should be avoided when the affected view tree updates 3139 * often. Every update will require to re-render the software layer, which can 3140 * potentially be slow (particularly when hardware acceleration is turned on 3141 * since the layer will have to be uploaded into a hardware texture after every 3142 * update.)</p> 3143 * 3144 * @see #getLayerType() 3145 * @see #setLayerType(int, android.graphics.Paint) 3146 * @see #LAYER_TYPE_NONE 3147 * @see #LAYER_TYPE_HARDWARE 3148 */ 3149 public static final int LAYER_TYPE_SOFTWARE = 1; 3150 3151 /** 3152 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3153 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3154 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3155 * rendering pipeline, but only if hardware acceleration is turned on for the 3156 * view hierarchy. When hardware acceleration is turned off, hardware layers 3157 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3158 * 3159 * <p>A hardware layer is useful to apply a specific color filter and/or 3160 * blending mode and/or translucency to a view and all its children.</p> 3161 * <p>A hardware layer can be used to cache a complex view tree into a 3162 * texture and reduce the complexity of drawing operations. For instance, 3163 * when animating a complex view tree with a translation, a hardware layer can 3164 * be used to render the view tree only once.</p> 3165 * <p>A hardware layer can also be used to increase the rendering quality when 3166 * rotation transformations are applied on a view. It can also be used to 3167 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3168 * 3169 * @see #getLayerType() 3170 * @see #setLayerType(int, android.graphics.Paint) 3171 * @see #LAYER_TYPE_NONE 3172 * @see #LAYER_TYPE_SOFTWARE 3173 */ 3174 public static final int LAYER_TYPE_HARDWARE = 2; 3175 3176 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3177 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3178 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3179 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3180 }) 3181 int mLayerType = LAYER_TYPE_NONE; 3182 Paint mLayerPaint; 3183 Rect mLocalDirtyRect; 3184 3185 /** 3186 * Set to true when the view is sending hover accessibility events because it 3187 * is the innermost hovered view. 3188 */ 3189 private boolean mSendingHoverAccessibilityEvents; 3190 3191 /** 3192 * Delegate for injecting accessibility functionality. 3193 */ 3194 AccessibilityDelegate mAccessibilityDelegate; 3195 3196 /** 3197 * Consistency verifier for debugging purposes. 3198 * @hide 3199 */ 3200 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3201 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3202 new InputEventConsistencyVerifier(this, 0) : null; 3203 3204 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3205 3206 /** 3207 * Simple constructor to use when creating a view from code. 3208 * 3209 * @param context The Context the view is running in, through which it can 3210 * access the current theme, resources, etc. 3211 */ 3212 public View(Context context) { 3213 mContext = context; 3214 mResources = context != null ? context.getResources() : null; 3215 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3216 // Set layout and text direction defaults 3217 mPrivateFlags2 = 3218 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3219 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3220 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3221 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3222 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3223 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3224 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3225 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3226 mUserPaddingStart = UNDEFINED_PADDING; 3227 mUserPaddingEnd = UNDEFINED_PADDING; 3228 } 3229 3230 /** 3231 * Constructor that is called when inflating a view from XML. This is called 3232 * when a view is being constructed from an XML file, supplying attributes 3233 * that were specified in the XML file. This version uses a default style of 3234 * 0, so the only attribute values applied are those in the Context's Theme 3235 * and the given AttributeSet. 3236 * 3237 * <p> 3238 * The method onFinishInflate() will be called after all children have been 3239 * added. 3240 * 3241 * @param context The Context the view is running in, through which it can 3242 * access the current theme, resources, etc. 3243 * @param attrs The attributes of the XML tag that is inflating the view. 3244 * @see #View(Context, AttributeSet, int) 3245 */ 3246 public View(Context context, AttributeSet attrs) { 3247 this(context, attrs, 0); 3248 } 3249 3250 /** 3251 * Perform inflation from XML and apply a class-specific base style. This 3252 * constructor of View allows subclasses to use their own base style when 3253 * they are inflating. For example, a Button class's constructor would call 3254 * this version of the super class constructor and supply 3255 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3256 * the theme's button style to modify all of the base view attributes (in 3257 * particular its background) as well as the Button class's attributes. 3258 * 3259 * @param context The Context the view is running in, through which it can 3260 * access the current theme, resources, etc. 3261 * @param attrs The attributes of the XML tag that is inflating the view. 3262 * @param defStyle The default style to apply to this view. If 0, no style 3263 * will be applied (beyond what is included in the theme). This may 3264 * either be an attribute resource, whose value will be retrieved 3265 * from the current theme, or an explicit style resource. 3266 * @see #View(Context, AttributeSet) 3267 */ 3268 public View(Context context, AttributeSet attrs, int defStyle) { 3269 this(context); 3270 3271 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3272 defStyle, 0); 3273 3274 Drawable background = null; 3275 3276 int leftPadding = -1; 3277 int topPadding = -1; 3278 int rightPadding = -1; 3279 int bottomPadding = -1; 3280 int startPadding = UNDEFINED_PADDING; 3281 int endPadding = UNDEFINED_PADDING; 3282 3283 int padding = -1; 3284 3285 int viewFlagValues = 0; 3286 int viewFlagMasks = 0; 3287 3288 boolean setScrollContainer = false; 3289 3290 int x = 0; 3291 int y = 0; 3292 3293 float tx = 0; 3294 float ty = 0; 3295 float rotation = 0; 3296 float rotationX = 0; 3297 float rotationY = 0; 3298 float sx = 1f; 3299 float sy = 1f; 3300 boolean transformSet = false; 3301 3302 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3303 int overScrollMode = mOverScrollMode; 3304 boolean initializeScrollbars = false; 3305 3306 boolean leftPaddingDefined = false; 3307 boolean rightPaddingDefined = false; 3308 boolean startPaddingDefined = false; 3309 boolean endPaddingDefined = false; 3310 3311 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3312 3313 final int N = a.getIndexCount(); 3314 for (int i = 0; i < N; i++) { 3315 int attr = a.getIndex(i); 3316 switch (attr) { 3317 case com.android.internal.R.styleable.View_background: 3318 background = a.getDrawable(attr); 3319 break; 3320 case com.android.internal.R.styleable.View_padding: 3321 padding = a.getDimensionPixelSize(attr, -1); 3322 mUserPaddingLeftInitial = padding; 3323 mUserPaddingRightInitial = padding; 3324 leftPaddingDefined = true; 3325 rightPaddingDefined = true; 3326 break; 3327 case com.android.internal.R.styleable.View_paddingLeft: 3328 leftPadding = a.getDimensionPixelSize(attr, -1); 3329 mUserPaddingLeftInitial = leftPadding; 3330 leftPaddingDefined = true; 3331 break; 3332 case com.android.internal.R.styleable.View_paddingTop: 3333 topPadding = a.getDimensionPixelSize(attr, -1); 3334 break; 3335 case com.android.internal.R.styleable.View_paddingRight: 3336 rightPadding = a.getDimensionPixelSize(attr, -1); 3337 mUserPaddingRightInitial = rightPadding; 3338 rightPaddingDefined = true; 3339 break; 3340 case com.android.internal.R.styleable.View_paddingBottom: 3341 bottomPadding = a.getDimensionPixelSize(attr, -1); 3342 break; 3343 case com.android.internal.R.styleable.View_paddingStart: 3344 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3345 startPaddingDefined = true; 3346 break; 3347 case com.android.internal.R.styleable.View_paddingEnd: 3348 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3349 endPaddingDefined = true; 3350 break; 3351 case com.android.internal.R.styleable.View_scrollX: 3352 x = a.getDimensionPixelOffset(attr, 0); 3353 break; 3354 case com.android.internal.R.styleable.View_scrollY: 3355 y = a.getDimensionPixelOffset(attr, 0); 3356 break; 3357 case com.android.internal.R.styleable.View_alpha: 3358 setAlpha(a.getFloat(attr, 1f)); 3359 break; 3360 case com.android.internal.R.styleable.View_transformPivotX: 3361 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3362 break; 3363 case com.android.internal.R.styleable.View_transformPivotY: 3364 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3365 break; 3366 case com.android.internal.R.styleable.View_translationX: 3367 tx = a.getDimensionPixelOffset(attr, 0); 3368 transformSet = true; 3369 break; 3370 case com.android.internal.R.styleable.View_translationY: 3371 ty = a.getDimensionPixelOffset(attr, 0); 3372 transformSet = true; 3373 break; 3374 case com.android.internal.R.styleable.View_rotation: 3375 rotation = a.getFloat(attr, 0); 3376 transformSet = true; 3377 break; 3378 case com.android.internal.R.styleable.View_rotationX: 3379 rotationX = a.getFloat(attr, 0); 3380 transformSet = true; 3381 break; 3382 case com.android.internal.R.styleable.View_rotationY: 3383 rotationY = a.getFloat(attr, 0); 3384 transformSet = true; 3385 break; 3386 case com.android.internal.R.styleable.View_scaleX: 3387 sx = a.getFloat(attr, 1f); 3388 transformSet = true; 3389 break; 3390 case com.android.internal.R.styleable.View_scaleY: 3391 sy = a.getFloat(attr, 1f); 3392 transformSet = true; 3393 break; 3394 case com.android.internal.R.styleable.View_id: 3395 mID = a.getResourceId(attr, NO_ID); 3396 break; 3397 case com.android.internal.R.styleable.View_tag: 3398 mTag = a.getText(attr); 3399 break; 3400 case com.android.internal.R.styleable.View_fitsSystemWindows: 3401 if (a.getBoolean(attr, false)) { 3402 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3403 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3404 } 3405 break; 3406 case com.android.internal.R.styleable.View_focusable: 3407 if (a.getBoolean(attr, false)) { 3408 viewFlagValues |= FOCUSABLE; 3409 viewFlagMasks |= FOCUSABLE_MASK; 3410 } 3411 break; 3412 case com.android.internal.R.styleable.View_focusableInTouchMode: 3413 if (a.getBoolean(attr, false)) { 3414 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3415 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3416 } 3417 break; 3418 case com.android.internal.R.styleable.View_clickable: 3419 if (a.getBoolean(attr, false)) { 3420 viewFlagValues |= CLICKABLE; 3421 viewFlagMasks |= CLICKABLE; 3422 } 3423 break; 3424 case com.android.internal.R.styleable.View_longClickable: 3425 if (a.getBoolean(attr, false)) { 3426 viewFlagValues |= LONG_CLICKABLE; 3427 viewFlagMasks |= LONG_CLICKABLE; 3428 } 3429 break; 3430 case com.android.internal.R.styleable.View_saveEnabled: 3431 if (!a.getBoolean(attr, true)) { 3432 viewFlagValues |= SAVE_DISABLED; 3433 viewFlagMasks |= SAVE_DISABLED_MASK; 3434 } 3435 break; 3436 case com.android.internal.R.styleable.View_duplicateParentState: 3437 if (a.getBoolean(attr, false)) { 3438 viewFlagValues |= DUPLICATE_PARENT_STATE; 3439 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3440 } 3441 break; 3442 case com.android.internal.R.styleable.View_visibility: 3443 final int visibility = a.getInt(attr, 0); 3444 if (visibility != 0) { 3445 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3446 viewFlagMasks |= VISIBILITY_MASK; 3447 } 3448 break; 3449 case com.android.internal.R.styleable.View_layoutDirection: 3450 // Clear any layout direction flags (included resolved bits) already set 3451 mPrivateFlags2 &= 3452 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3453 // Set the layout direction flags depending on the value of the attribute 3454 final int layoutDirection = a.getInt(attr, -1); 3455 final int value = (layoutDirection != -1) ? 3456 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3457 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3458 break; 3459 case com.android.internal.R.styleable.View_drawingCacheQuality: 3460 final int cacheQuality = a.getInt(attr, 0); 3461 if (cacheQuality != 0) { 3462 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3463 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3464 } 3465 break; 3466 case com.android.internal.R.styleable.View_contentDescription: 3467 setContentDescription(a.getString(attr)); 3468 break; 3469 case com.android.internal.R.styleable.View_labelFor: 3470 setLabelFor(a.getResourceId(attr, NO_ID)); 3471 break; 3472 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3473 if (!a.getBoolean(attr, true)) { 3474 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3475 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3476 } 3477 break; 3478 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3479 if (!a.getBoolean(attr, true)) { 3480 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3481 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3482 } 3483 break; 3484 case R.styleable.View_scrollbars: 3485 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3486 if (scrollbars != SCROLLBARS_NONE) { 3487 viewFlagValues |= scrollbars; 3488 viewFlagMasks |= SCROLLBARS_MASK; 3489 initializeScrollbars = true; 3490 } 3491 break; 3492 //noinspection deprecation 3493 case R.styleable.View_fadingEdge: 3494 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3495 // Ignore the attribute starting with ICS 3496 break; 3497 } 3498 // With builds < ICS, fall through and apply fading edges 3499 case R.styleable.View_requiresFadingEdge: 3500 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3501 if (fadingEdge != FADING_EDGE_NONE) { 3502 viewFlagValues |= fadingEdge; 3503 viewFlagMasks |= FADING_EDGE_MASK; 3504 initializeFadingEdge(a); 3505 } 3506 break; 3507 case R.styleable.View_scrollbarStyle: 3508 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3509 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3510 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3511 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3512 } 3513 break; 3514 case R.styleable.View_isScrollContainer: 3515 setScrollContainer = true; 3516 if (a.getBoolean(attr, false)) { 3517 setScrollContainer(true); 3518 } 3519 break; 3520 case com.android.internal.R.styleable.View_keepScreenOn: 3521 if (a.getBoolean(attr, false)) { 3522 viewFlagValues |= KEEP_SCREEN_ON; 3523 viewFlagMasks |= KEEP_SCREEN_ON; 3524 } 3525 break; 3526 case R.styleable.View_filterTouchesWhenObscured: 3527 if (a.getBoolean(attr, false)) { 3528 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3529 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3530 } 3531 break; 3532 case R.styleable.View_nextFocusLeft: 3533 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3534 break; 3535 case R.styleable.View_nextFocusRight: 3536 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3537 break; 3538 case R.styleable.View_nextFocusUp: 3539 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3540 break; 3541 case R.styleable.View_nextFocusDown: 3542 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3543 break; 3544 case R.styleable.View_nextFocusForward: 3545 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3546 break; 3547 case R.styleable.View_minWidth: 3548 mMinWidth = a.getDimensionPixelSize(attr, 0); 3549 break; 3550 case R.styleable.View_minHeight: 3551 mMinHeight = a.getDimensionPixelSize(attr, 0); 3552 break; 3553 case R.styleable.View_onClick: 3554 if (context.isRestricted()) { 3555 throw new IllegalStateException("The android:onClick attribute cannot " 3556 + "be used within a restricted context"); 3557 } 3558 3559 final String handlerName = a.getString(attr); 3560 if (handlerName != null) { 3561 setOnClickListener(new OnClickListener() { 3562 private Method mHandler; 3563 3564 public void onClick(View v) { 3565 if (mHandler == null) { 3566 try { 3567 mHandler = getContext().getClass().getMethod(handlerName, 3568 View.class); 3569 } catch (NoSuchMethodException e) { 3570 int id = getId(); 3571 String idText = id == NO_ID ? "" : " with id '" 3572 + getContext().getResources().getResourceEntryName( 3573 id) + "'"; 3574 throw new IllegalStateException("Could not find a method " + 3575 handlerName + "(View) in the activity " 3576 + getContext().getClass() + " for onClick handler" 3577 + " on view " + View.this.getClass() + idText, e); 3578 } 3579 } 3580 3581 try { 3582 mHandler.invoke(getContext(), View.this); 3583 } catch (IllegalAccessException e) { 3584 throw new IllegalStateException("Could not execute non " 3585 + "public method of the activity", e); 3586 } catch (InvocationTargetException e) { 3587 throw new IllegalStateException("Could not execute " 3588 + "method of the activity", e); 3589 } 3590 } 3591 }); 3592 } 3593 break; 3594 case R.styleable.View_overScrollMode: 3595 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3596 break; 3597 case R.styleable.View_verticalScrollbarPosition: 3598 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3599 break; 3600 case R.styleable.View_layerType: 3601 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3602 break; 3603 case R.styleable.View_textDirection: 3604 // Clear any text direction flag already set 3605 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3606 // Set the text direction flags depending on the value of the attribute 3607 final int textDirection = a.getInt(attr, -1); 3608 if (textDirection != -1) { 3609 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3610 } 3611 break; 3612 case R.styleable.View_textAlignment: 3613 // Clear any text alignment flag already set 3614 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3615 // Set the text alignment flag depending on the value of the attribute 3616 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3617 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3618 break; 3619 case R.styleable.View_importantForAccessibility: 3620 setImportantForAccessibility(a.getInt(attr, 3621 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3622 break; 3623 } 3624 } 3625 3626 setOverScrollMode(overScrollMode); 3627 3628 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3629 // the resolved layout direction). Those cached values will be used later during padding 3630 // resolution. 3631 mUserPaddingStart = startPadding; 3632 mUserPaddingEnd = endPadding; 3633 3634 if (background != null) { 3635 setBackground(background); 3636 } 3637 3638 if (padding >= 0) { 3639 leftPadding = padding; 3640 topPadding = padding; 3641 rightPadding = padding; 3642 bottomPadding = padding; 3643 mUserPaddingLeftInitial = padding; 3644 mUserPaddingRightInitial = padding; 3645 } 3646 3647 if (isRtlCompatibilityMode()) { 3648 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3649 // left / right padding are used if defined (meaning here nothing to do). If they are not 3650 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3651 // start / end and resolve them as left / right (layout direction is not taken into account). 3652 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3653 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3654 // defined. 3655 if (!leftPaddingDefined && startPaddingDefined) { 3656 leftPadding = startPadding; 3657 } 3658 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3659 if (!rightPaddingDefined && endPaddingDefined) { 3660 rightPadding = endPadding; 3661 } 3662 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3663 } else { 3664 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3665 // values defined. Otherwise, left /right values are used. 3666 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3667 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3668 // defined. 3669 if (leftPaddingDefined) { 3670 mUserPaddingLeftInitial = leftPadding; 3671 } 3672 if (rightPaddingDefined) { 3673 mUserPaddingRightInitial = rightPadding; 3674 } 3675 } 3676 3677 internalSetPadding( 3678 mUserPaddingLeftInitial, 3679 topPadding >= 0 ? topPadding : mPaddingTop, 3680 mUserPaddingRightInitial, 3681 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3682 3683 if (viewFlagMasks != 0) { 3684 setFlags(viewFlagValues, viewFlagMasks); 3685 } 3686 3687 if (initializeScrollbars) { 3688 initializeScrollbars(a); 3689 } 3690 3691 a.recycle(); 3692 3693 // Needs to be called after mViewFlags is set 3694 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3695 recomputePadding(); 3696 } 3697 3698 if (x != 0 || y != 0) { 3699 scrollTo(x, y); 3700 } 3701 3702 if (transformSet) { 3703 setTranslationX(tx); 3704 setTranslationY(ty); 3705 setRotation(rotation); 3706 setRotationX(rotationX); 3707 setRotationY(rotationY); 3708 setScaleX(sx); 3709 setScaleY(sy); 3710 } 3711 3712 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3713 setScrollContainer(true); 3714 } 3715 3716 computeOpaqueFlags(); 3717 } 3718 3719 /** 3720 * Non-public constructor for use in testing 3721 */ 3722 View() { 3723 mResources = null; 3724 } 3725 3726 public String toString() { 3727 StringBuilder out = new StringBuilder(128); 3728 out.append(getClass().getName()); 3729 out.append('{'); 3730 out.append(Integer.toHexString(System.identityHashCode(this))); 3731 out.append(' '); 3732 switch (mViewFlags&VISIBILITY_MASK) { 3733 case VISIBLE: out.append('V'); break; 3734 case INVISIBLE: out.append('I'); break; 3735 case GONE: out.append('G'); break; 3736 default: out.append('.'); break; 3737 } 3738 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3739 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3740 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3741 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3742 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3743 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3744 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3745 out.append(' '); 3746 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3747 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3748 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3749 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3750 out.append('p'); 3751 } else { 3752 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3753 } 3754 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3755 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3756 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3757 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3758 out.append(' '); 3759 out.append(mLeft); 3760 out.append(','); 3761 out.append(mTop); 3762 out.append('-'); 3763 out.append(mRight); 3764 out.append(','); 3765 out.append(mBottom); 3766 final int id = getId(); 3767 if (id != NO_ID) { 3768 out.append(" #"); 3769 out.append(Integer.toHexString(id)); 3770 final Resources r = mResources; 3771 if (id != 0 && r != null) { 3772 try { 3773 String pkgname; 3774 switch (id&0xff000000) { 3775 case 0x7f000000: 3776 pkgname="app"; 3777 break; 3778 case 0x01000000: 3779 pkgname="android"; 3780 break; 3781 default: 3782 pkgname = r.getResourcePackageName(id); 3783 break; 3784 } 3785 String typename = r.getResourceTypeName(id); 3786 String entryname = r.getResourceEntryName(id); 3787 out.append(" "); 3788 out.append(pkgname); 3789 out.append(":"); 3790 out.append(typename); 3791 out.append("/"); 3792 out.append(entryname); 3793 } catch (Resources.NotFoundException e) { 3794 } 3795 } 3796 } 3797 out.append("}"); 3798 return out.toString(); 3799 } 3800 3801 /** 3802 * <p> 3803 * Initializes the fading edges from a given set of styled attributes. This 3804 * method should be called by subclasses that need fading edges and when an 3805 * instance of these subclasses is created programmatically rather than 3806 * being inflated from XML. This method is automatically called when the XML 3807 * is inflated. 3808 * </p> 3809 * 3810 * @param a the styled attributes set to initialize the fading edges from 3811 */ 3812 protected void initializeFadingEdge(TypedArray a) { 3813 initScrollCache(); 3814 3815 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3816 R.styleable.View_fadingEdgeLength, 3817 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3818 } 3819 3820 /** 3821 * Returns the size of the vertical faded edges used to indicate that more 3822 * content in this view is visible. 3823 * 3824 * @return The size in pixels of the vertical faded edge or 0 if vertical 3825 * faded edges are not enabled for this view. 3826 * @attr ref android.R.styleable#View_fadingEdgeLength 3827 */ 3828 public int getVerticalFadingEdgeLength() { 3829 if (isVerticalFadingEdgeEnabled()) { 3830 ScrollabilityCache cache = mScrollCache; 3831 if (cache != null) { 3832 return cache.fadingEdgeLength; 3833 } 3834 } 3835 return 0; 3836 } 3837 3838 /** 3839 * Set the size of the faded edge used to indicate that more content in this 3840 * view is available. Will not change whether the fading edge is enabled; use 3841 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3842 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3843 * for the vertical or horizontal fading edges. 3844 * 3845 * @param length The size in pixels of the faded edge used to indicate that more 3846 * content in this view is visible. 3847 */ 3848 public void setFadingEdgeLength(int length) { 3849 initScrollCache(); 3850 mScrollCache.fadingEdgeLength = length; 3851 } 3852 3853 /** 3854 * Returns the size of the horizontal faded edges used to indicate that more 3855 * content in this view is visible. 3856 * 3857 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3858 * faded edges are not enabled for this view. 3859 * @attr ref android.R.styleable#View_fadingEdgeLength 3860 */ 3861 public int getHorizontalFadingEdgeLength() { 3862 if (isHorizontalFadingEdgeEnabled()) { 3863 ScrollabilityCache cache = mScrollCache; 3864 if (cache != null) { 3865 return cache.fadingEdgeLength; 3866 } 3867 } 3868 return 0; 3869 } 3870 3871 /** 3872 * Returns the width of the vertical scrollbar. 3873 * 3874 * @return The width in pixels of the vertical scrollbar or 0 if there 3875 * is no vertical scrollbar. 3876 */ 3877 public int getVerticalScrollbarWidth() { 3878 ScrollabilityCache cache = mScrollCache; 3879 if (cache != null) { 3880 ScrollBarDrawable scrollBar = cache.scrollBar; 3881 if (scrollBar != null) { 3882 int size = scrollBar.getSize(true); 3883 if (size <= 0) { 3884 size = cache.scrollBarSize; 3885 } 3886 return size; 3887 } 3888 return 0; 3889 } 3890 return 0; 3891 } 3892 3893 /** 3894 * Returns the height of the horizontal scrollbar. 3895 * 3896 * @return The height in pixels of the horizontal scrollbar or 0 if 3897 * there is no horizontal scrollbar. 3898 */ 3899 protected int getHorizontalScrollbarHeight() { 3900 ScrollabilityCache cache = mScrollCache; 3901 if (cache != null) { 3902 ScrollBarDrawable scrollBar = cache.scrollBar; 3903 if (scrollBar != null) { 3904 int size = scrollBar.getSize(false); 3905 if (size <= 0) { 3906 size = cache.scrollBarSize; 3907 } 3908 return size; 3909 } 3910 return 0; 3911 } 3912 return 0; 3913 } 3914 3915 /** 3916 * <p> 3917 * Initializes the scrollbars from a given set of styled attributes. This 3918 * method should be called by subclasses that need scrollbars and when an 3919 * instance of these subclasses is created programmatically rather than 3920 * being inflated from XML. This method is automatically called when the XML 3921 * is inflated. 3922 * </p> 3923 * 3924 * @param a the styled attributes set to initialize the scrollbars from 3925 */ 3926 protected void initializeScrollbars(TypedArray a) { 3927 initScrollCache(); 3928 3929 final ScrollabilityCache scrollabilityCache = mScrollCache; 3930 3931 if (scrollabilityCache.scrollBar == null) { 3932 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3933 } 3934 3935 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3936 3937 if (!fadeScrollbars) { 3938 scrollabilityCache.state = ScrollabilityCache.ON; 3939 } 3940 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3941 3942 3943 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3944 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3945 .getScrollBarFadeDuration()); 3946 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3947 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3948 ViewConfiguration.getScrollDefaultDelay()); 3949 3950 3951 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3952 com.android.internal.R.styleable.View_scrollbarSize, 3953 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3954 3955 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3956 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3957 3958 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3959 if (thumb != null) { 3960 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3961 } 3962 3963 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3964 false); 3965 if (alwaysDraw) { 3966 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3967 } 3968 3969 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3970 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3971 3972 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3973 if (thumb != null) { 3974 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3975 } 3976 3977 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3978 false); 3979 if (alwaysDraw) { 3980 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3981 } 3982 3983 // Apply layout direction to the new Drawables if needed 3984 final int layoutDirection = getLayoutDirection(); 3985 if (track != null) { 3986 track.setLayoutDirection(layoutDirection); 3987 } 3988 if (thumb != null) { 3989 thumb.setLayoutDirection(layoutDirection); 3990 } 3991 3992 // Re-apply user/background padding so that scrollbar(s) get added 3993 resolvePadding(); 3994 } 3995 3996 /** 3997 * <p> 3998 * Initalizes the scrollability cache if necessary. 3999 * </p> 4000 */ 4001 private void initScrollCache() { 4002 if (mScrollCache == null) { 4003 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4004 } 4005 } 4006 4007 private ScrollabilityCache getScrollCache() { 4008 initScrollCache(); 4009 return mScrollCache; 4010 } 4011 4012 /** 4013 * Set the position of the vertical scroll bar. Should be one of 4014 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4015 * {@link #SCROLLBAR_POSITION_RIGHT}. 4016 * 4017 * @param position Where the vertical scroll bar should be positioned. 4018 */ 4019 public void setVerticalScrollbarPosition(int position) { 4020 if (mVerticalScrollbarPosition != position) { 4021 mVerticalScrollbarPosition = position; 4022 computeOpaqueFlags(); 4023 resolvePadding(); 4024 } 4025 } 4026 4027 /** 4028 * @return The position where the vertical scroll bar will show, if applicable. 4029 * @see #setVerticalScrollbarPosition(int) 4030 */ 4031 public int getVerticalScrollbarPosition() { 4032 return mVerticalScrollbarPosition; 4033 } 4034 4035 ListenerInfo getListenerInfo() { 4036 if (mListenerInfo != null) { 4037 return mListenerInfo; 4038 } 4039 mListenerInfo = new ListenerInfo(); 4040 return mListenerInfo; 4041 } 4042 4043 /** 4044 * Register a callback to be invoked when focus of this view changed. 4045 * 4046 * @param l The callback that will run. 4047 */ 4048 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4049 getListenerInfo().mOnFocusChangeListener = l; 4050 } 4051 4052 /** 4053 * Add a listener that will be called when the bounds of the view change due to 4054 * layout processing. 4055 * 4056 * @param listener The listener that will be called when layout bounds change. 4057 */ 4058 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4059 ListenerInfo li = getListenerInfo(); 4060 if (li.mOnLayoutChangeListeners == null) { 4061 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4062 } 4063 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4064 li.mOnLayoutChangeListeners.add(listener); 4065 } 4066 } 4067 4068 /** 4069 * Remove a listener for layout changes. 4070 * 4071 * @param listener The listener for layout bounds change. 4072 */ 4073 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4074 ListenerInfo li = mListenerInfo; 4075 if (li == null || li.mOnLayoutChangeListeners == null) { 4076 return; 4077 } 4078 li.mOnLayoutChangeListeners.remove(listener); 4079 } 4080 4081 /** 4082 * Add a listener for attach state changes. 4083 * 4084 * This listener will be called whenever this view is attached or detached 4085 * from a window. Remove the listener using 4086 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4087 * 4088 * @param listener Listener to attach 4089 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4090 */ 4091 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4092 ListenerInfo li = getListenerInfo(); 4093 if (li.mOnAttachStateChangeListeners == null) { 4094 li.mOnAttachStateChangeListeners 4095 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4096 } 4097 li.mOnAttachStateChangeListeners.add(listener); 4098 } 4099 4100 /** 4101 * Remove a listener for attach state changes. The listener will receive no further 4102 * notification of window attach/detach events. 4103 * 4104 * @param listener Listener to remove 4105 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4106 */ 4107 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4108 ListenerInfo li = mListenerInfo; 4109 if (li == null || li.mOnAttachStateChangeListeners == null) { 4110 return; 4111 } 4112 li.mOnAttachStateChangeListeners.remove(listener); 4113 } 4114 4115 /** 4116 * Returns the focus-change callback registered for this view. 4117 * 4118 * @return The callback, or null if one is not registered. 4119 */ 4120 public OnFocusChangeListener getOnFocusChangeListener() { 4121 ListenerInfo li = mListenerInfo; 4122 return li != null ? li.mOnFocusChangeListener : null; 4123 } 4124 4125 /** 4126 * Register a callback to be invoked when this view is clicked. If this view is not 4127 * clickable, it becomes clickable. 4128 * 4129 * @param l The callback that will run 4130 * 4131 * @see #setClickable(boolean) 4132 */ 4133 public void setOnClickListener(OnClickListener l) { 4134 if (!isClickable()) { 4135 setClickable(true); 4136 } 4137 getListenerInfo().mOnClickListener = l; 4138 } 4139 4140 /** 4141 * Return whether this view has an attached OnClickListener. Returns 4142 * true if there is a listener, false if there is none. 4143 */ 4144 public boolean hasOnClickListeners() { 4145 ListenerInfo li = mListenerInfo; 4146 return (li != null && li.mOnClickListener != null); 4147 } 4148 4149 /** 4150 * Register a callback to be invoked when this view is clicked and held. If this view is not 4151 * long clickable, it becomes long clickable. 4152 * 4153 * @param l The callback that will run 4154 * 4155 * @see #setLongClickable(boolean) 4156 */ 4157 public void setOnLongClickListener(OnLongClickListener l) { 4158 if (!isLongClickable()) { 4159 setLongClickable(true); 4160 } 4161 getListenerInfo().mOnLongClickListener = l; 4162 } 4163 4164 /** 4165 * Register a callback to be invoked when the context menu for this view is 4166 * being built. If this view is not long clickable, it becomes long clickable. 4167 * 4168 * @param l The callback that will run 4169 * 4170 */ 4171 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4172 if (!isLongClickable()) { 4173 setLongClickable(true); 4174 } 4175 getListenerInfo().mOnCreateContextMenuListener = l; 4176 } 4177 4178 /** 4179 * Call this view's OnClickListener, if it is defined. Performs all normal 4180 * actions associated with clicking: reporting accessibility event, playing 4181 * a sound, etc. 4182 * 4183 * @return True there was an assigned OnClickListener that was called, false 4184 * otherwise is returned. 4185 */ 4186 public boolean performClick() { 4187 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4188 4189 ListenerInfo li = mListenerInfo; 4190 if (li != null && li.mOnClickListener != null) { 4191 playSoundEffect(SoundEffectConstants.CLICK); 4192 li.mOnClickListener.onClick(this); 4193 return true; 4194 } 4195 4196 return false; 4197 } 4198 4199 /** 4200 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4201 * this only calls the listener, and does not do any associated clicking 4202 * actions like reporting an accessibility event. 4203 * 4204 * @return True there was an assigned OnClickListener that was called, false 4205 * otherwise is returned. 4206 */ 4207 public boolean callOnClick() { 4208 ListenerInfo li = mListenerInfo; 4209 if (li != null && li.mOnClickListener != null) { 4210 li.mOnClickListener.onClick(this); 4211 return true; 4212 } 4213 return false; 4214 } 4215 4216 /** 4217 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4218 * OnLongClickListener did not consume the event. 4219 * 4220 * @return True if one of the above receivers consumed the event, false otherwise. 4221 */ 4222 public boolean performLongClick() { 4223 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4224 4225 boolean handled = false; 4226 ListenerInfo li = mListenerInfo; 4227 if (li != null && li.mOnLongClickListener != null) { 4228 handled = li.mOnLongClickListener.onLongClick(View.this); 4229 } 4230 if (!handled) { 4231 handled = showContextMenu(); 4232 } 4233 if (handled) { 4234 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4235 } 4236 return handled; 4237 } 4238 4239 /** 4240 * Performs button-related actions during a touch down event. 4241 * 4242 * @param event The event. 4243 * @return True if the down was consumed. 4244 * 4245 * @hide 4246 */ 4247 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4248 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4249 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4250 return true; 4251 } 4252 } 4253 return false; 4254 } 4255 4256 /** 4257 * Bring up the context menu for this view. 4258 * 4259 * @return Whether a context menu was displayed. 4260 */ 4261 public boolean showContextMenu() { 4262 return getParent().showContextMenuForChild(this); 4263 } 4264 4265 /** 4266 * Bring up the context menu for this view, referring to the item under the specified point. 4267 * 4268 * @param x The referenced x coordinate. 4269 * @param y The referenced y coordinate. 4270 * @param metaState The keyboard modifiers that were pressed. 4271 * @return Whether a context menu was displayed. 4272 * 4273 * @hide 4274 */ 4275 public boolean showContextMenu(float x, float y, int metaState) { 4276 return showContextMenu(); 4277 } 4278 4279 /** 4280 * Start an action mode. 4281 * 4282 * @param callback Callback that will control the lifecycle of the action mode 4283 * @return The new action mode if it is started, null otherwise 4284 * 4285 * @see ActionMode 4286 */ 4287 public ActionMode startActionMode(ActionMode.Callback callback) { 4288 ViewParent parent = getParent(); 4289 if (parent == null) return null; 4290 return parent.startActionModeForChild(this, callback); 4291 } 4292 4293 /** 4294 * Register a callback to be invoked when a hardware key is pressed in this view. 4295 * Key presses in software input methods will generally not trigger the methods of 4296 * this listener. 4297 * @param l the key listener to attach to this view 4298 */ 4299 public void setOnKeyListener(OnKeyListener l) { 4300 getListenerInfo().mOnKeyListener = l; 4301 } 4302 4303 /** 4304 * Register a callback to be invoked when a touch event is sent to this view. 4305 * @param l the touch listener to attach to this view 4306 */ 4307 public void setOnTouchListener(OnTouchListener l) { 4308 getListenerInfo().mOnTouchListener = l; 4309 } 4310 4311 /** 4312 * Register a callback to be invoked when a generic motion event is sent to this view. 4313 * @param l the generic motion listener to attach to this view 4314 */ 4315 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4316 getListenerInfo().mOnGenericMotionListener = l; 4317 } 4318 4319 /** 4320 * Register a callback to be invoked when a hover event is sent to this view. 4321 * @param l the hover listener to attach to this view 4322 */ 4323 public void setOnHoverListener(OnHoverListener l) { 4324 getListenerInfo().mOnHoverListener = l; 4325 } 4326 4327 /** 4328 * Register a drag event listener callback object for this View. The parameter is 4329 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4330 * View, the system calls the 4331 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4332 * @param l An implementation of {@link android.view.View.OnDragListener}. 4333 */ 4334 public void setOnDragListener(OnDragListener l) { 4335 getListenerInfo().mOnDragListener = l; 4336 } 4337 4338 /** 4339 * Give this view focus. This will cause 4340 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4341 * 4342 * Note: this does not check whether this {@link View} should get focus, it just 4343 * gives it focus no matter what. It should only be called internally by framework 4344 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4345 * 4346 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4347 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4348 * focus moved when requestFocus() is called. It may not always 4349 * apply, in which case use the default View.FOCUS_DOWN. 4350 * @param previouslyFocusedRect The rectangle of the view that had focus 4351 * prior in this View's coordinate system. 4352 */ 4353 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4354 if (DBG) { 4355 System.out.println(this + " requestFocus()"); 4356 } 4357 4358 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4359 mPrivateFlags |= PFLAG_FOCUSED; 4360 4361 if (mParent != null) { 4362 mParent.requestChildFocus(this, this); 4363 } 4364 4365 onFocusChanged(true, direction, previouslyFocusedRect); 4366 refreshDrawableState(); 4367 4368 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4369 notifyAccessibilityStateChanged(); 4370 } 4371 } 4372 } 4373 4374 /** 4375 * Request that a rectangle of this view be visible on the screen, 4376 * scrolling if necessary just enough. 4377 * 4378 * <p>A View should call this if it maintains some notion of which part 4379 * of its content is interesting. For example, a text editing view 4380 * should call this when its cursor moves. 4381 * 4382 * @param rectangle The rectangle. 4383 * @return Whether any parent scrolled. 4384 */ 4385 public boolean requestRectangleOnScreen(Rect rectangle) { 4386 return requestRectangleOnScreen(rectangle, false); 4387 } 4388 4389 /** 4390 * Request that a rectangle of this view be visible on the screen, 4391 * scrolling if necessary just enough. 4392 * 4393 * <p>A View should call this if it maintains some notion of which part 4394 * of its content is interesting. For example, a text editing view 4395 * should call this when its cursor moves. 4396 * 4397 * <p>When <code>immediate</code> is set to true, scrolling will not be 4398 * animated. 4399 * 4400 * @param rectangle The rectangle. 4401 * @param immediate True to forbid animated scrolling, false otherwise 4402 * @return Whether any parent scrolled. 4403 */ 4404 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4405 if (mParent == null) { 4406 return false; 4407 } 4408 4409 View child = this; 4410 4411 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4412 position.set(rectangle); 4413 4414 ViewParent parent = mParent; 4415 boolean scrolled = false; 4416 while (parent != null) { 4417 rectangle.set((int) position.left, (int) position.top, 4418 (int) position.right, (int) position.bottom); 4419 4420 scrolled |= parent.requestChildRectangleOnScreen(child, 4421 rectangle, immediate); 4422 4423 if (!child.hasIdentityMatrix()) { 4424 child.getMatrix().mapRect(position); 4425 } 4426 4427 position.offset(child.mLeft, child.mTop); 4428 4429 if (!(parent instanceof View)) { 4430 break; 4431 } 4432 4433 View parentView = (View) parent; 4434 4435 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4436 4437 child = parentView; 4438 parent = child.getParent(); 4439 } 4440 4441 return scrolled; 4442 } 4443 4444 /** 4445 * Called when this view wants to give up focus. If focus is cleared 4446 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4447 * <p> 4448 * <strong>Note:</strong> When a View clears focus the framework is trying 4449 * to give focus to the first focusable View from the top. Hence, if this 4450 * View is the first from the top that can take focus, then all callbacks 4451 * related to clearing focus will be invoked after wich the framework will 4452 * give focus to this view. 4453 * </p> 4454 */ 4455 public void clearFocus() { 4456 if (DBG) { 4457 System.out.println(this + " clearFocus()"); 4458 } 4459 4460 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4461 mPrivateFlags &= ~PFLAG_FOCUSED; 4462 4463 if (mParent != null) { 4464 mParent.clearChildFocus(this); 4465 } 4466 4467 onFocusChanged(false, 0, null); 4468 4469 refreshDrawableState(); 4470 4471 ensureInputFocusOnFirstFocusable(); 4472 4473 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4474 notifyAccessibilityStateChanged(); 4475 } 4476 } 4477 } 4478 4479 void ensureInputFocusOnFirstFocusable() { 4480 View root = getRootView(); 4481 if (root != null) { 4482 root.requestFocus(); 4483 } 4484 } 4485 4486 /** 4487 * Called internally by the view system when a new view is getting focus. 4488 * This is what clears the old focus. 4489 */ 4490 void unFocus() { 4491 if (DBG) { 4492 System.out.println(this + " unFocus()"); 4493 } 4494 4495 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4496 mPrivateFlags &= ~PFLAG_FOCUSED; 4497 4498 onFocusChanged(false, 0, null); 4499 refreshDrawableState(); 4500 4501 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4502 notifyAccessibilityStateChanged(); 4503 } 4504 } 4505 } 4506 4507 /** 4508 * Returns true if this view has focus iteself, or is the ancestor of the 4509 * view that has focus. 4510 * 4511 * @return True if this view has or contains focus, false otherwise. 4512 */ 4513 @ViewDebug.ExportedProperty(category = "focus") 4514 public boolean hasFocus() { 4515 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4516 } 4517 4518 /** 4519 * Returns true if this view is focusable or if it contains a reachable View 4520 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4521 * is a View whose parents do not block descendants focus. 4522 * 4523 * Only {@link #VISIBLE} views are considered focusable. 4524 * 4525 * @return True if the view is focusable or if the view contains a focusable 4526 * View, false otherwise. 4527 * 4528 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4529 */ 4530 public boolean hasFocusable() { 4531 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4532 } 4533 4534 /** 4535 * Called by the view system when the focus state of this view changes. 4536 * When the focus change event is caused by directional navigation, direction 4537 * and previouslyFocusedRect provide insight into where the focus is coming from. 4538 * When overriding, be sure to call up through to the super class so that 4539 * the standard focus handling will occur. 4540 * 4541 * @param gainFocus True if the View has focus; false otherwise. 4542 * @param direction The direction focus has moved when requestFocus() 4543 * is called to give this view focus. Values are 4544 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4545 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4546 * It may not always apply, in which case use the default. 4547 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4548 * system, of the previously focused view. If applicable, this will be 4549 * passed in as finer grained information about where the focus is coming 4550 * from (in addition to direction). Will be <code>null</code> otherwise. 4551 */ 4552 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4553 if (gainFocus) { 4554 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4555 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4556 } 4557 } 4558 4559 InputMethodManager imm = InputMethodManager.peekInstance(); 4560 if (!gainFocus) { 4561 if (isPressed()) { 4562 setPressed(false); 4563 } 4564 if (imm != null && mAttachInfo != null 4565 && mAttachInfo.mHasWindowFocus) { 4566 imm.focusOut(this); 4567 } 4568 onFocusLost(); 4569 } else if (imm != null && mAttachInfo != null 4570 && mAttachInfo.mHasWindowFocus) { 4571 imm.focusIn(this); 4572 } 4573 4574 invalidate(true); 4575 ListenerInfo li = mListenerInfo; 4576 if (li != null && li.mOnFocusChangeListener != null) { 4577 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4578 } 4579 4580 if (mAttachInfo != null) { 4581 mAttachInfo.mKeyDispatchState.reset(this); 4582 } 4583 } 4584 4585 /** 4586 * Sends an accessibility event of the given type. If accessibility is 4587 * not enabled this method has no effect. The default implementation calls 4588 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4589 * to populate information about the event source (this View), then calls 4590 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4591 * populate the text content of the event source including its descendants, 4592 * and last calls 4593 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4594 * on its parent to resuest sending of the event to interested parties. 4595 * <p> 4596 * If an {@link AccessibilityDelegate} has been specified via calling 4597 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4598 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4599 * responsible for handling this call. 4600 * </p> 4601 * 4602 * @param eventType The type of the event to send, as defined by several types from 4603 * {@link android.view.accessibility.AccessibilityEvent}, such as 4604 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4605 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4606 * 4607 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4608 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4609 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4610 * @see AccessibilityDelegate 4611 */ 4612 public void sendAccessibilityEvent(int eventType) { 4613 if (mAccessibilityDelegate != null) { 4614 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4615 } else { 4616 sendAccessibilityEventInternal(eventType); 4617 } 4618 } 4619 4620 /** 4621 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4622 * {@link AccessibilityEvent} to make an announcement which is related to some 4623 * sort of a context change for which none of the events representing UI transitions 4624 * is a good fit. For example, announcing a new page in a book. If accessibility 4625 * is not enabled this method does nothing. 4626 * 4627 * @param text The announcement text. 4628 */ 4629 public void announceForAccessibility(CharSequence text) { 4630 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4631 AccessibilityEvent event = AccessibilityEvent.obtain( 4632 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4633 onInitializeAccessibilityEvent(event); 4634 event.getText().add(text); 4635 event.setContentDescription(null); 4636 mParent.requestSendAccessibilityEvent(this, event); 4637 } 4638 } 4639 4640 /** 4641 * @see #sendAccessibilityEvent(int) 4642 * 4643 * Note: Called from the default {@link AccessibilityDelegate}. 4644 */ 4645 void sendAccessibilityEventInternal(int eventType) { 4646 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4647 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4648 } 4649 } 4650 4651 /** 4652 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4653 * takes as an argument an empty {@link AccessibilityEvent} and does not 4654 * perform a check whether accessibility is enabled. 4655 * <p> 4656 * If an {@link AccessibilityDelegate} has been specified via calling 4657 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4658 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4659 * is responsible for handling this call. 4660 * </p> 4661 * 4662 * @param event The event to send. 4663 * 4664 * @see #sendAccessibilityEvent(int) 4665 */ 4666 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4667 if (mAccessibilityDelegate != null) { 4668 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4669 } else { 4670 sendAccessibilityEventUncheckedInternal(event); 4671 } 4672 } 4673 4674 /** 4675 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4676 * 4677 * Note: Called from the default {@link AccessibilityDelegate}. 4678 */ 4679 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4680 if (!isShown()) { 4681 return; 4682 } 4683 onInitializeAccessibilityEvent(event); 4684 // Only a subset of accessibility events populates text content. 4685 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4686 dispatchPopulateAccessibilityEvent(event); 4687 } 4688 // In the beginning we called #isShown(), so we know that getParent() is not null. 4689 getParent().requestSendAccessibilityEvent(this, event); 4690 } 4691 4692 /** 4693 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4694 * to its children for adding their text content to the event. Note that the 4695 * event text is populated in a separate dispatch path since we add to the 4696 * event not only the text of the source but also the text of all its descendants. 4697 * A typical implementation will call 4698 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4699 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4700 * on each child. Override this method if custom population of the event text 4701 * content is required. 4702 * <p> 4703 * If an {@link AccessibilityDelegate} has been specified via calling 4704 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4705 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4706 * is responsible for handling this call. 4707 * </p> 4708 * <p> 4709 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4710 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4711 * </p> 4712 * 4713 * @param event The event. 4714 * 4715 * @return True if the event population was completed. 4716 */ 4717 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4718 if (mAccessibilityDelegate != null) { 4719 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4720 } else { 4721 return dispatchPopulateAccessibilityEventInternal(event); 4722 } 4723 } 4724 4725 /** 4726 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4727 * 4728 * Note: Called from the default {@link AccessibilityDelegate}. 4729 */ 4730 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4731 onPopulateAccessibilityEvent(event); 4732 return false; 4733 } 4734 4735 /** 4736 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4737 * giving a chance to this View to populate the accessibility event with its 4738 * text content. While this method is free to modify event 4739 * attributes other than text content, doing so should normally be performed in 4740 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4741 * <p> 4742 * Example: Adding formatted date string to an accessibility event in addition 4743 * to the text added by the super implementation: 4744 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4745 * super.onPopulateAccessibilityEvent(event); 4746 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4747 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4748 * mCurrentDate.getTimeInMillis(), flags); 4749 * event.getText().add(selectedDateUtterance); 4750 * }</pre> 4751 * <p> 4752 * If an {@link AccessibilityDelegate} has been specified via calling 4753 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4754 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4755 * is responsible for handling this call. 4756 * </p> 4757 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4758 * information to the event, in case the default implementation has basic information to add. 4759 * </p> 4760 * 4761 * @param event The accessibility event which to populate. 4762 * 4763 * @see #sendAccessibilityEvent(int) 4764 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4765 */ 4766 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4767 if (mAccessibilityDelegate != null) { 4768 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4769 } else { 4770 onPopulateAccessibilityEventInternal(event); 4771 } 4772 } 4773 4774 /** 4775 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4776 * 4777 * Note: Called from the default {@link AccessibilityDelegate}. 4778 */ 4779 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4780 4781 } 4782 4783 /** 4784 * Initializes an {@link AccessibilityEvent} with information about 4785 * this View which is the event source. In other words, the source of 4786 * an accessibility event is the view whose state change triggered firing 4787 * the event. 4788 * <p> 4789 * Example: Setting the password property of an event in addition 4790 * to properties set by the super implementation: 4791 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4792 * super.onInitializeAccessibilityEvent(event); 4793 * event.setPassword(true); 4794 * }</pre> 4795 * <p> 4796 * If an {@link AccessibilityDelegate} has been specified via calling 4797 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4798 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4799 * is responsible for handling this call. 4800 * </p> 4801 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4802 * information to the event, in case the default implementation has basic information to add. 4803 * </p> 4804 * @param event The event to initialize. 4805 * 4806 * @see #sendAccessibilityEvent(int) 4807 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4808 */ 4809 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4810 if (mAccessibilityDelegate != null) { 4811 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4812 } else { 4813 onInitializeAccessibilityEventInternal(event); 4814 } 4815 } 4816 4817 /** 4818 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4819 * 4820 * Note: Called from the default {@link AccessibilityDelegate}. 4821 */ 4822 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4823 event.setSource(this); 4824 event.setClassName(View.class.getName()); 4825 event.setPackageName(getContext().getPackageName()); 4826 event.setEnabled(isEnabled()); 4827 event.setContentDescription(mContentDescription); 4828 4829 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4830 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4831 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4832 FOCUSABLES_ALL); 4833 event.setItemCount(focusablesTempList.size()); 4834 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4835 focusablesTempList.clear(); 4836 } 4837 } 4838 4839 /** 4840 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4841 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4842 * This method is responsible for obtaining an accessibility node info from a 4843 * pool of reusable instances and calling 4844 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4845 * initialize the former. 4846 * <p> 4847 * Note: The client is responsible for recycling the obtained instance by calling 4848 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4849 * </p> 4850 * 4851 * @return A populated {@link AccessibilityNodeInfo}. 4852 * 4853 * @see AccessibilityNodeInfo 4854 */ 4855 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4856 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4857 if (provider != null) { 4858 return provider.createAccessibilityNodeInfo(View.NO_ID); 4859 } else { 4860 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4861 onInitializeAccessibilityNodeInfo(info); 4862 return info; 4863 } 4864 } 4865 4866 /** 4867 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4868 * The base implementation sets: 4869 * <ul> 4870 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4871 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4872 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4873 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4874 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4875 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4876 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4877 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4878 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4879 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4880 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4881 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4882 * </ul> 4883 * <p> 4884 * Subclasses should override this method, call the super implementation, 4885 * and set additional attributes. 4886 * </p> 4887 * <p> 4888 * If an {@link AccessibilityDelegate} has been specified via calling 4889 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4890 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4891 * is responsible for handling this call. 4892 * </p> 4893 * 4894 * @param info The instance to initialize. 4895 */ 4896 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4897 if (mAccessibilityDelegate != null) { 4898 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4899 } else { 4900 onInitializeAccessibilityNodeInfoInternal(info); 4901 } 4902 } 4903 4904 /** 4905 * Gets the location of this view in screen coordintates. 4906 * 4907 * @param outRect The output location 4908 */ 4909 void getBoundsOnScreen(Rect outRect) { 4910 if (mAttachInfo == null) { 4911 return; 4912 } 4913 4914 RectF position = mAttachInfo.mTmpTransformRect; 4915 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4916 4917 if (!hasIdentityMatrix()) { 4918 getMatrix().mapRect(position); 4919 } 4920 4921 position.offset(mLeft, mTop); 4922 4923 ViewParent parent = mParent; 4924 while (parent instanceof View) { 4925 View parentView = (View) parent; 4926 4927 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4928 4929 if (!parentView.hasIdentityMatrix()) { 4930 parentView.getMatrix().mapRect(position); 4931 } 4932 4933 position.offset(parentView.mLeft, parentView.mTop); 4934 4935 parent = parentView.mParent; 4936 } 4937 4938 if (parent instanceof ViewRootImpl) { 4939 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4940 position.offset(0, -viewRootImpl.mCurScrollY); 4941 } 4942 4943 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4944 4945 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4946 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4947 } 4948 4949 /** 4950 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4951 * 4952 * Note: Called from the default {@link AccessibilityDelegate}. 4953 */ 4954 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4955 Rect bounds = mAttachInfo.mTmpInvalRect; 4956 4957 getDrawingRect(bounds); 4958 info.setBoundsInParent(bounds); 4959 4960 getBoundsOnScreen(bounds); 4961 info.setBoundsInScreen(bounds); 4962 4963 ViewParent parent = getParentForAccessibility(); 4964 if (parent instanceof View) { 4965 info.setParent((View) parent); 4966 } 4967 4968 if (mID != View.NO_ID) { 4969 View rootView = getRootView(); 4970 if (rootView == null) { 4971 rootView = this; 4972 } 4973 View label = rootView.findLabelForView(this, mID); 4974 if (label != null) { 4975 info.setLabeledBy(label); 4976 } 4977 } 4978 4979 if (mLabelForId != View.NO_ID) { 4980 View rootView = getRootView(); 4981 if (rootView == null) { 4982 rootView = this; 4983 } 4984 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 4985 if (labeled != null) { 4986 info.setLabelFor(labeled); 4987 } 4988 } 4989 4990 info.setVisibleToUser(isVisibleToUser()); 4991 4992 info.setPackageName(mContext.getPackageName()); 4993 info.setClassName(View.class.getName()); 4994 info.setContentDescription(getContentDescription()); 4995 4996 info.setEnabled(isEnabled()); 4997 info.setClickable(isClickable()); 4998 info.setFocusable(isFocusable()); 4999 info.setFocused(isFocused()); 5000 info.setAccessibilityFocused(isAccessibilityFocused()); 5001 info.setSelected(isSelected()); 5002 info.setLongClickable(isLongClickable()); 5003 5004 // TODO: These make sense only if we are in an AdapterView but all 5005 // views can be selected. Maybe from accessibility perspective 5006 // we should report as selectable view in an AdapterView. 5007 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5008 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5009 5010 if (isFocusable()) { 5011 if (isFocused()) { 5012 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5013 } else { 5014 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5015 } 5016 } 5017 5018 if (!isAccessibilityFocused()) { 5019 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5020 } else { 5021 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5022 } 5023 5024 if (isClickable() && isEnabled()) { 5025 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5026 } 5027 5028 if (isLongClickable() && isEnabled()) { 5029 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5030 } 5031 5032 if (mContentDescription != null && mContentDescription.length() > 0) { 5033 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5034 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5035 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5036 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5037 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5038 } 5039 } 5040 5041 private View findLabelForView(View view, int labeledId) { 5042 if (mMatchLabelForPredicate == null) { 5043 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5044 } 5045 mMatchLabelForPredicate.mLabeledId = labeledId; 5046 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5047 } 5048 5049 /** 5050 * Computes whether this view is visible to the user. Such a view is 5051 * attached, visible, all its predecessors are visible, it is not clipped 5052 * entirely by its predecessors, and has an alpha greater than zero. 5053 * 5054 * @return Whether the view is visible on the screen. 5055 * 5056 * @hide 5057 */ 5058 protected boolean isVisibleToUser() { 5059 return isVisibleToUser(null); 5060 } 5061 5062 /** 5063 * Computes whether the given portion of this view is visible to the user. 5064 * Such a view is attached, visible, all its predecessors are visible, 5065 * has an alpha greater than zero, and the specified portion is not 5066 * clipped entirely by its predecessors. 5067 * 5068 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5069 * <code>null</code>, and the entire view will be tested in this case. 5070 * When <code>true</code> is returned by the function, the actual visible 5071 * region will be stored in this parameter; that is, if boundInView is fully 5072 * contained within the view, no modification will be made, otherwise regions 5073 * outside of the visible area of the view will be clipped. 5074 * 5075 * @return Whether the specified portion of the view is visible on the screen. 5076 * 5077 * @hide 5078 */ 5079 protected boolean isVisibleToUser(Rect boundInView) { 5080 if (mAttachInfo != null) { 5081 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5082 Point offset = mAttachInfo.mPoint; 5083 // The first two checks are made also made by isShown() which 5084 // however traverses the tree up to the parent to catch that. 5085 // Therefore, we do some fail fast check to minimize the up 5086 // tree traversal. 5087 boolean isVisible = mAttachInfo.mWindowVisibility == View.VISIBLE 5088 && getAlpha() > 0 5089 && isShown() 5090 && getGlobalVisibleRect(visibleRect, offset); 5091 if (isVisible && boundInView != null) { 5092 visibleRect.offset(-offset.x, -offset.y); 5093 // isVisible is always true here, use a simple assignment 5094 isVisible = boundInView.intersect(visibleRect); 5095 } 5096 return isVisible; 5097 } 5098 5099 return false; 5100 } 5101 5102 /** 5103 * Returns the delegate for implementing accessibility support via 5104 * composition. For more details see {@link AccessibilityDelegate}. 5105 * 5106 * @return The delegate, or null if none set. 5107 * 5108 * @hide 5109 */ 5110 public AccessibilityDelegate getAccessibilityDelegate() { 5111 return mAccessibilityDelegate; 5112 } 5113 5114 /** 5115 * Sets a delegate for implementing accessibility support via composition as 5116 * opposed to inheritance. The delegate's primary use is for implementing 5117 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5118 * 5119 * @param delegate The delegate instance. 5120 * 5121 * @see AccessibilityDelegate 5122 */ 5123 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5124 mAccessibilityDelegate = delegate; 5125 } 5126 5127 /** 5128 * Gets the provider for managing a virtual view hierarchy rooted at this View 5129 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5130 * that explore the window content. 5131 * <p> 5132 * If this method returns an instance, this instance is responsible for managing 5133 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5134 * View including the one representing the View itself. Similarly the returned 5135 * instance is responsible for performing accessibility actions on any virtual 5136 * view or the root view itself. 5137 * </p> 5138 * <p> 5139 * If an {@link AccessibilityDelegate} has been specified via calling 5140 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5141 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5142 * is responsible for handling this call. 5143 * </p> 5144 * 5145 * @return The provider. 5146 * 5147 * @see AccessibilityNodeProvider 5148 */ 5149 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5150 if (mAccessibilityDelegate != null) { 5151 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5152 } else { 5153 return null; 5154 } 5155 } 5156 5157 /** 5158 * Gets the unique identifier of this view on the screen for accessibility purposes. 5159 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5160 * 5161 * @return The view accessibility id. 5162 * 5163 * @hide 5164 */ 5165 public int getAccessibilityViewId() { 5166 if (mAccessibilityViewId == NO_ID) { 5167 mAccessibilityViewId = sNextAccessibilityViewId++; 5168 } 5169 return mAccessibilityViewId; 5170 } 5171 5172 /** 5173 * Gets the unique identifier of the window in which this View reseides. 5174 * 5175 * @return The window accessibility id. 5176 * 5177 * @hide 5178 */ 5179 public int getAccessibilityWindowId() { 5180 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5181 } 5182 5183 /** 5184 * Gets the {@link View} description. It briefly describes the view and is 5185 * primarily used for accessibility support. Set this property to enable 5186 * better accessibility support for your application. This is especially 5187 * true for views that do not have textual representation (For example, 5188 * ImageButton). 5189 * 5190 * @return The content description. 5191 * 5192 * @attr ref android.R.styleable#View_contentDescription 5193 */ 5194 @ViewDebug.ExportedProperty(category = "accessibility") 5195 public CharSequence getContentDescription() { 5196 return mContentDescription; 5197 } 5198 5199 /** 5200 * Sets the {@link View} description. It briefly describes the view and is 5201 * primarily used for accessibility support. Set this property to enable 5202 * better accessibility support for your application. This is especially 5203 * true for views that do not have textual representation (For example, 5204 * ImageButton). 5205 * 5206 * @param contentDescription The content description. 5207 * 5208 * @attr ref android.R.styleable#View_contentDescription 5209 */ 5210 @RemotableViewMethod 5211 public void setContentDescription(CharSequence contentDescription) { 5212 if (mContentDescription == null) { 5213 if (contentDescription == null) { 5214 return; 5215 } 5216 } else if (mContentDescription.equals(contentDescription)) { 5217 return; 5218 } 5219 mContentDescription = contentDescription; 5220 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5221 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5222 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5223 } 5224 notifyAccessibilityStateChanged(); 5225 } 5226 5227 /** 5228 * Gets the id of a view for which this view serves as a label for 5229 * accessibility purposes. 5230 * 5231 * @return The labeled view id. 5232 */ 5233 @ViewDebug.ExportedProperty(category = "accessibility") 5234 public int getLabelFor() { 5235 return mLabelForId; 5236 } 5237 5238 /** 5239 * Sets the id of a view for which this view serves as a label for 5240 * accessibility purposes. 5241 * 5242 * @param id The labeled view id. 5243 */ 5244 @RemotableViewMethod 5245 public void setLabelFor(int id) { 5246 mLabelForId = id; 5247 if (mLabelForId != View.NO_ID 5248 && mID == View.NO_ID) { 5249 mID = generateViewId(); 5250 } 5251 } 5252 5253 /** 5254 * Invoked whenever this view loses focus, either by losing window focus or by losing 5255 * focus within its window. This method can be used to clear any state tied to the 5256 * focus. For instance, if a button is held pressed with the trackball and the window 5257 * loses focus, this method can be used to cancel the press. 5258 * 5259 * Subclasses of View overriding this method should always call super.onFocusLost(). 5260 * 5261 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5262 * @see #onWindowFocusChanged(boolean) 5263 * 5264 * @hide pending API council approval 5265 */ 5266 protected void onFocusLost() { 5267 resetPressedState(); 5268 } 5269 5270 private void resetPressedState() { 5271 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5272 return; 5273 } 5274 5275 if (isPressed()) { 5276 setPressed(false); 5277 5278 if (!mHasPerformedLongPress) { 5279 removeLongPressCallback(); 5280 } 5281 } 5282 } 5283 5284 /** 5285 * Returns true if this view has focus 5286 * 5287 * @return True if this view has focus, false otherwise. 5288 */ 5289 @ViewDebug.ExportedProperty(category = "focus") 5290 public boolean isFocused() { 5291 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5292 } 5293 5294 /** 5295 * Find the view in the hierarchy rooted at this view that currently has 5296 * focus. 5297 * 5298 * @return The view that currently has focus, or null if no focused view can 5299 * be found. 5300 */ 5301 public View findFocus() { 5302 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5303 } 5304 5305 /** 5306 * Indicates whether this view is one of the set of scrollable containers in 5307 * its window. 5308 * 5309 * @return whether this view is one of the set of scrollable containers in 5310 * its window 5311 * 5312 * @attr ref android.R.styleable#View_isScrollContainer 5313 */ 5314 public boolean isScrollContainer() { 5315 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5316 } 5317 5318 /** 5319 * Change whether this view is one of the set of scrollable containers in 5320 * its window. This will be used to determine whether the window can 5321 * resize or must pan when a soft input area is open -- scrollable 5322 * containers allow the window to use resize mode since the container 5323 * will appropriately shrink. 5324 * 5325 * @attr ref android.R.styleable#View_isScrollContainer 5326 */ 5327 public void setScrollContainer(boolean isScrollContainer) { 5328 if (isScrollContainer) { 5329 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5330 mAttachInfo.mScrollContainers.add(this); 5331 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5332 } 5333 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5334 } else { 5335 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5336 mAttachInfo.mScrollContainers.remove(this); 5337 } 5338 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5339 } 5340 } 5341 5342 /** 5343 * Returns the quality of the drawing cache. 5344 * 5345 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5346 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5347 * 5348 * @see #setDrawingCacheQuality(int) 5349 * @see #setDrawingCacheEnabled(boolean) 5350 * @see #isDrawingCacheEnabled() 5351 * 5352 * @attr ref android.R.styleable#View_drawingCacheQuality 5353 */ 5354 public int getDrawingCacheQuality() { 5355 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5356 } 5357 5358 /** 5359 * Set the drawing cache quality of this view. This value is used only when the 5360 * drawing cache is enabled 5361 * 5362 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5363 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5364 * 5365 * @see #getDrawingCacheQuality() 5366 * @see #setDrawingCacheEnabled(boolean) 5367 * @see #isDrawingCacheEnabled() 5368 * 5369 * @attr ref android.R.styleable#View_drawingCacheQuality 5370 */ 5371 public void setDrawingCacheQuality(int quality) { 5372 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5373 } 5374 5375 /** 5376 * Returns whether the screen should remain on, corresponding to the current 5377 * value of {@link #KEEP_SCREEN_ON}. 5378 * 5379 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5380 * 5381 * @see #setKeepScreenOn(boolean) 5382 * 5383 * @attr ref android.R.styleable#View_keepScreenOn 5384 */ 5385 public boolean getKeepScreenOn() { 5386 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5387 } 5388 5389 /** 5390 * Controls whether the screen should remain on, modifying the 5391 * value of {@link #KEEP_SCREEN_ON}. 5392 * 5393 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5394 * 5395 * @see #getKeepScreenOn() 5396 * 5397 * @attr ref android.R.styleable#View_keepScreenOn 5398 */ 5399 public void setKeepScreenOn(boolean keepScreenOn) { 5400 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5401 } 5402 5403 /** 5404 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5405 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5406 * 5407 * @attr ref android.R.styleable#View_nextFocusLeft 5408 */ 5409 public int getNextFocusLeftId() { 5410 return mNextFocusLeftId; 5411 } 5412 5413 /** 5414 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5415 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5416 * decide automatically. 5417 * 5418 * @attr ref android.R.styleable#View_nextFocusLeft 5419 */ 5420 public void setNextFocusLeftId(int nextFocusLeftId) { 5421 mNextFocusLeftId = nextFocusLeftId; 5422 } 5423 5424 /** 5425 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5426 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5427 * 5428 * @attr ref android.R.styleable#View_nextFocusRight 5429 */ 5430 public int getNextFocusRightId() { 5431 return mNextFocusRightId; 5432 } 5433 5434 /** 5435 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5436 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5437 * decide automatically. 5438 * 5439 * @attr ref android.R.styleable#View_nextFocusRight 5440 */ 5441 public void setNextFocusRightId(int nextFocusRightId) { 5442 mNextFocusRightId = nextFocusRightId; 5443 } 5444 5445 /** 5446 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5447 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5448 * 5449 * @attr ref android.R.styleable#View_nextFocusUp 5450 */ 5451 public int getNextFocusUpId() { 5452 return mNextFocusUpId; 5453 } 5454 5455 /** 5456 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5457 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5458 * decide automatically. 5459 * 5460 * @attr ref android.R.styleable#View_nextFocusUp 5461 */ 5462 public void setNextFocusUpId(int nextFocusUpId) { 5463 mNextFocusUpId = nextFocusUpId; 5464 } 5465 5466 /** 5467 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5468 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5469 * 5470 * @attr ref android.R.styleable#View_nextFocusDown 5471 */ 5472 public int getNextFocusDownId() { 5473 return mNextFocusDownId; 5474 } 5475 5476 /** 5477 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5478 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5479 * decide automatically. 5480 * 5481 * @attr ref android.R.styleable#View_nextFocusDown 5482 */ 5483 public void setNextFocusDownId(int nextFocusDownId) { 5484 mNextFocusDownId = nextFocusDownId; 5485 } 5486 5487 /** 5488 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5489 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5490 * 5491 * @attr ref android.R.styleable#View_nextFocusForward 5492 */ 5493 public int getNextFocusForwardId() { 5494 return mNextFocusForwardId; 5495 } 5496 5497 /** 5498 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5499 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5500 * decide automatically. 5501 * 5502 * @attr ref android.R.styleable#View_nextFocusForward 5503 */ 5504 public void setNextFocusForwardId(int nextFocusForwardId) { 5505 mNextFocusForwardId = nextFocusForwardId; 5506 } 5507 5508 /** 5509 * Returns the visibility of this view and all of its ancestors 5510 * 5511 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5512 */ 5513 public boolean isShown() { 5514 View current = this; 5515 //noinspection ConstantConditions 5516 do { 5517 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5518 return false; 5519 } 5520 ViewParent parent = current.mParent; 5521 if (parent == null) { 5522 return false; // We are not attached to the view root 5523 } 5524 if (!(parent instanceof View)) { 5525 return true; 5526 } 5527 current = (View) parent; 5528 } while (current != null); 5529 5530 return false; 5531 } 5532 5533 /** 5534 * Called by the view hierarchy when the content insets for a window have 5535 * changed, to allow it to adjust its content to fit within those windows. 5536 * The content insets tell you the space that the status bar, input method, 5537 * and other system windows infringe on the application's window. 5538 * 5539 * <p>You do not normally need to deal with this function, since the default 5540 * window decoration given to applications takes care of applying it to the 5541 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5542 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5543 * and your content can be placed under those system elements. You can then 5544 * use this method within your view hierarchy if you have parts of your UI 5545 * which you would like to ensure are not being covered. 5546 * 5547 * <p>The default implementation of this method simply applies the content 5548 * inset's to the view's padding, consuming that content (modifying the 5549 * insets to be 0), and returning true. This behavior is off by default, but can 5550 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5551 * 5552 * <p>This function's traversal down the hierarchy is depth-first. The same content 5553 * insets object is propagated down the hierarchy, so any changes made to it will 5554 * be seen by all following views (including potentially ones above in 5555 * the hierarchy since this is a depth-first traversal). The first view 5556 * that returns true will abort the entire traversal. 5557 * 5558 * <p>The default implementation works well for a situation where it is 5559 * used with a container that covers the entire window, allowing it to 5560 * apply the appropriate insets to its content on all edges. If you need 5561 * a more complicated layout (such as two different views fitting system 5562 * windows, one on the top of the window, and one on the bottom), 5563 * you can override the method and handle the insets however you would like. 5564 * Note that the insets provided by the framework are always relative to the 5565 * far edges of the window, not accounting for the location of the called view 5566 * within that window. (In fact when this method is called you do not yet know 5567 * where the layout will place the view, as it is done before layout happens.) 5568 * 5569 * <p>Note: unlike many View methods, there is no dispatch phase to this 5570 * call. If you are overriding it in a ViewGroup and want to allow the 5571 * call to continue to your children, you must be sure to call the super 5572 * implementation. 5573 * 5574 * <p>Here is a sample layout that makes use of fitting system windows 5575 * to have controls for a video view placed inside of the window decorations 5576 * that it hides and shows. This can be used with code like the second 5577 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5578 * 5579 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5580 * 5581 * @param insets Current content insets of the window. Prior to 5582 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5583 * the insets or else you and Android will be unhappy. 5584 * 5585 * @return Return true if this view applied the insets and it should not 5586 * continue propagating further down the hierarchy, false otherwise. 5587 * @see #getFitsSystemWindows() 5588 * @see #setFitsSystemWindows(boolean) 5589 * @see #setSystemUiVisibility(int) 5590 */ 5591 protected boolean fitSystemWindows(Rect insets) { 5592 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5593 mUserPaddingStart = UNDEFINED_PADDING; 5594 mUserPaddingEnd = UNDEFINED_PADDING; 5595 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5596 || mAttachInfo == null 5597 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5598 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5599 return true; 5600 } else { 5601 internalSetPadding(0, 0, 0, 0); 5602 return false; 5603 } 5604 } 5605 return false; 5606 } 5607 5608 /** 5609 * Sets whether or not this view should account for system screen decorations 5610 * such as the status bar and inset its content; that is, controlling whether 5611 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5612 * executed. See that method for more details. 5613 * 5614 * <p>Note that if you are providing your own implementation of 5615 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5616 * flag to true -- your implementation will be overriding the default 5617 * implementation that checks this flag. 5618 * 5619 * @param fitSystemWindows If true, then the default implementation of 5620 * {@link #fitSystemWindows(Rect)} will be executed. 5621 * 5622 * @attr ref android.R.styleable#View_fitsSystemWindows 5623 * @see #getFitsSystemWindows() 5624 * @see #fitSystemWindows(Rect) 5625 * @see #setSystemUiVisibility(int) 5626 */ 5627 public void setFitsSystemWindows(boolean fitSystemWindows) { 5628 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5629 } 5630 5631 /** 5632 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5633 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5634 * will be executed. 5635 * 5636 * @return Returns true if the default implementation of 5637 * {@link #fitSystemWindows(Rect)} will be executed. 5638 * 5639 * @attr ref android.R.styleable#View_fitsSystemWindows 5640 * @see #setFitsSystemWindows() 5641 * @see #fitSystemWindows(Rect) 5642 * @see #setSystemUiVisibility(int) 5643 */ 5644 public boolean getFitsSystemWindows() { 5645 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5646 } 5647 5648 /** @hide */ 5649 public boolean fitsSystemWindows() { 5650 return getFitsSystemWindows(); 5651 } 5652 5653 /** 5654 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5655 */ 5656 public void requestFitSystemWindows() { 5657 if (mParent != null) { 5658 mParent.requestFitSystemWindows(); 5659 } 5660 } 5661 5662 /** 5663 * For use by PhoneWindow to make its own system window fitting optional. 5664 * @hide 5665 */ 5666 public void makeOptionalFitsSystemWindows() { 5667 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5668 } 5669 5670 /** 5671 * Returns the visibility status for this view. 5672 * 5673 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5674 * @attr ref android.R.styleable#View_visibility 5675 */ 5676 @ViewDebug.ExportedProperty(mapping = { 5677 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5678 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5679 @ViewDebug.IntToString(from = GONE, to = "GONE") 5680 }) 5681 public int getVisibility() { 5682 return mViewFlags & VISIBILITY_MASK; 5683 } 5684 5685 /** 5686 * Set the enabled state of this view. 5687 * 5688 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5689 * @attr ref android.R.styleable#View_visibility 5690 */ 5691 @RemotableViewMethod 5692 public void setVisibility(int visibility) { 5693 setFlags(visibility, VISIBILITY_MASK); 5694 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5695 } 5696 5697 /** 5698 * Returns the enabled status for this view. The interpretation of the 5699 * enabled state varies by subclass. 5700 * 5701 * @return True if this view is enabled, false otherwise. 5702 */ 5703 @ViewDebug.ExportedProperty 5704 public boolean isEnabled() { 5705 return (mViewFlags & ENABLED_MASK) == ENABLED; 5706 } 5707 5708 /** 5709 * Set the enabled state of this view. The interpretation of the enabled 5710 * state varies by subclass. 5711 * 5712 * @param enabled True if this view is enabled, false otherwise. 5713 */ 5714 @RemotableViewMethod 5715 public void setEnabled(boolean enabled) { 5716 if (enabled == isEnabled()) return; 5717 5718 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5719 5720 /* 5721 * The View most likely has to change its appearance, so refresh 5722 * the drawable state. 5723 */ 5724 refreshDrawableState(); 5725 5726 // Invalidate too, since the default behavior for views is to be 5727 // be drawn at 50% alpha rather than to change the drawable. 5728 invalidate(true); 5729 } 5730 5731 /** 5732 * Set whether this view can receive the focus. 5733 * 5734 * Setting this to false will also ensure that this view is not focusable 5735 * in touch mode. 5736 * 5737 * @param focusable If true, this view can receive the focus. 5738 * 5739 * @see #setFocusableInTouchMode(boolean) 5740 * @attr ref android.R.styleable#View_focusable 5741 */ 5742 public void setFocusable(boolean focusable) { 5743 if (!focusable) { 5744 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5745 } 5746 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5747 } 5748 5749 /** 5750 * Set whether this view can receive focus while in touch mode. 5751 * 5752 * Setting this to true will also ensure that this view is focusable. 5753 * 5754 * @param focusableInTouchMode If true, this view can receive the focus while 5755 * in touch mode. 5756 * 5757 * @see #setFocusable(boolean) 5758 * @attr ref android.R.styleable#View_focusableInTouchMode 5759 */ 5760 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5761 // Focusable in touch mode should always be set before the focusable flag 5762 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5763 // which, in touch mode, will not successfully request focus on this view 5764 // because the focusable in touch mode flag is not set 5765 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5766 if (focusableInTouchMode) { 5767 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5768 } 5769 } 5770 5771 /** 5772 * Set whether this view should have sound effects enabled for events such as 5773 * clicking and touching. 5774 * 5775 * <p>You may wish to disable sound effects for a view if you already play sounds, 5776 * for instance, a dial key that plays dtmf tones. 5777 * 5778 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5779 * @see #isSoundEffectsEnabled() 5780 * @see #playSoundEffect(int) 5781 * @attr ref android.R.styleable#View_soundEffectsEnabled 5782 */ 5783 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5784 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5785 } 5786 5787 /** 5788 * @return whether this view should have sound effects enabled for events such as 5789 * clicking and touching. 5790 * 5791 * @see #setSoundEffectsEnabled(boolean) 5792 * @see #playSoundEffect(int) 5793 * @attr ref android.R.styleable#View_soundEffectsEnabled 5794 */ 5795 @ViewDebug.ExportedProperty 5796 public boolean isSoundEffectsEnabled() { 5797 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5798 } 5799 5800 /** 5801 * Set whether this view should have haptic feedback for events such as 5802 * long presses. 5803 * 5804 * <p>You may wish to disable haptic feedback if your view already controls 5805 * its own haptic feedback. 5806 * 5807 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5808 * @see #isHapticFeedbackEnabled() 5809 * @see #performHapticFeedback(int) 5810 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5811 */ 5812 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5813 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5814 } 5815 5816 /** 5817 * @return whether this view should have haptic feedback enabled for events 5818 * long presses. 5819 * 5820 * @see #setHapticFeedbackEnabled(boolean) 5821 * @see #performHapticFeedback(int) 5822 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5823 */ 5824 @ViewDebug.ExportedProperty 5825 public boolean isHapticFeedbackEnabled() { 5826 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5827 } 5828 5829 /** 5830 * Returns the layout direction for this view. 5831 * 5832 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5833 * {@link #LAYOUT_DIRECTION_RTL}, 5834 * {@link #LAYOUT_DIRECTION_INHERIT} or 5835 * {@link #LAYOUT_DIRECTION_LOCALE}. 5836 * @attr ref android.R.styleable#View_layoutDirection 5837 * 5838 * @hide 5839 */ 5840 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5841 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5842 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5843 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5844 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5845 }) 5846 public int getRawLayoutDirection() { 5847 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 5848 } 5849 5850 /** 5851 * Set the layout direction for this view. This will propagate a reset of layout direction 5852 * resolution to the view's children and resolve layout direction for this view. 5853 * 5854 * @param layoutDirection the layout direction to set. Should be one of: 5855 * 5856 * {@link #LAYOUT_DIRECTION_LTR}, 5857 * {@link #LAYOUT_DIRECTION_RTL}, 5858 * {@link #LAYOUT_DIRECTION_INHERIT}, 5859 * {@link #LAYOUT_DIRECTION_LOCALE}. 5860 * 5861 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 5862 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 5863 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 5864 * 5865 * @attr ref android.R.styleable#View_layoutDirection 5866 */ 5867 @RemotableViewMethod 5868 public void setLayoutDirection(int layoutDirection) { 5869 if (getRawLayoutDirection() != layoutDirection) { 5870 // Reset the current layout direction and the resolved one 5871 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 5872 resetRtlProperties(); 5873 // Set the new layout direction (filtered) 5874 mPrivateFlags2 |= 5875 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 5876 // We need to resolve all RTL properties as they all depend on layout direction 5877 resolveRtlPropertiesIfNeeded(); 5878 requestLayout(); 5879 invalidate(true); 5880 } 5881 } 5882 5883 /** 5884 * Returns the resolved layout direction for this view. 5885 * 5886 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5887 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5888 * 5889 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 5890 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 5891 */ 5892 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5893 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5894 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5895 }) 5896 public int getLayoutDirection() { 5897 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 5898 if (targetSdkVersion < JELLY_BEAN_MR1) { 5899 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 5900 return LAYOUT_DIRECTION_LTR; 5901 } 5902 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 5903 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5904 } 5905 5906 /** 5907 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5908 * layout attribute and/or the inherited value from the parent 5909 * 5910 * @return true if the layout is right-to-left. 5911 * 5912 * @hide 5913 */ 5914 @ViewDebug.ExportedProperty(category = "layout") 5915 public boolean isLayoutRtl() { 5916 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 5917 } 5918 5919 /** 5920 * Indicates whether the view is currently tracking transient state that the 5921 * app should not need to concern itself with saving and restoring, but that 5922 * the framework should take special note to preserve when possible. 5923 * 5924 * <p>A view with transient state cannot be trivially rebound from an external 5925 * data source, such as an adapter binding item views in a list. This may be 5926 * because the view is performing an animation, tracking user selection 5927 * of content, or similar.</p> 5928 * 5929 * @return true if the view has transient state 5930 */ 5931 @ViewDebug.ExportedProperty(category = "layout") 5932 public boolean hasTransientState() { 5933 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 5934 } 5935 5936 /** 5937 * Set whether this view is currently tracking transient state that the 5938 * framework should attempt to preserve when possible. This flag is reference counted, 5939 * so every call to setHasTransientState(true) should be paired with a later call 5940 * to setHasTransientState(false). 5941 * 5942 * <p>A view with transient state cannot be trivially rebound from an external 5943 * data source, such as an adapter binding item views in a list. This may be 5944 * because the view is performing an animation, tracking user selection 5945 * of content, or similar.</p> 5946 * 5947 * @param hasTransientState true if this view has transient state 5948 */ 5949 public void setHasTransientState(boolean hasTransientState) { 5950 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5951 mTransientStateCount - 1; 5952 if (mTransientStateCount < 0) { 5953 mTransientStateCount = 0; 5954 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5955 "unmatched pair of setHasTransientState calls"); 5956 } 5957 if ((hasTransientState && mTransientStateCount == 1) || 5958 (!hasTransientState && mTransientStateCount == 0)) { 5959 // update flag if we've just incremented up from 0 or decremented down to 0 5960 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 5961 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 5962 if (mParent != null) { 5963 try { 5964 mParent.childHasTransientStateChanged(this, hasTransientState); 5965 } catch (AbstractMethodError e) { 5966 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5967 " does not fully implement ViewParent", e); 5968 } 5969 } 5970 } 5971 } 5972 5973 /** 5974 * If this view doesn't do any drawing on its own, set this flag to 5975 * allow further optimizations. By default, this flag is not set on 5976 * View, but could be set on some View subclasses such as ViewGroup. 5977 * 5978 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5979 * you should clear this flag. 5980 * 5981 * @param willNotDraw whether or not this View draw on its own 5982 */ 5983 public void setWillNotDraw(boolean willNotDraw) { 5984 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5985 } 5986 5987 /** 5988 * Returns whether or not this View draws on its own. 5989 * 5990 * @return true if this view has nothing to draw, false otherwise 5991 */ 5992 @ViewDebug.ExportedProperty(category = "drawing") 5993 public boolean willNotDraw() { 5994 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5995 } 5996 5997 /** 5998 * When a View's drawing cache is enabled, drawing is redirected to an 5999 * offscreen bitmap. Some views, like an ImageView, must be able to 6000 * bypass this mechanism if they already draw a single bitmap, to avoid 6001 * unnecessary usage of the memory. 6002 * 6003 * @param willNotCacheDrawing true if this view does not cache its 6004 * drawing, false otherwise 6005 */ 6006 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6007 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6008 } 6009 6010 /** 6011 * Returns whether or not this View can cache its drawing or not. 6012 * 6013 * @return true if this view does not cache its drawing, false otherwise 6014 */ 6015 @ViewDebug.ExportedProperty(category = "drawing") 6016 public boolean willNotCacheDrawing() { 6017 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6018 } 6019 6020 /** 6021 * Indicates whether this view reacts to click events or not. 6022 * 6023 * @return true if the view is clickable, false otherwise 6024 * 6025 * @see #setClickable(boolean) 6026 * @attr ref android.R.styleable#View_clickable 6027 */ 6028 @ViewDebug.ExportedProperty 6029 public boolean isClickable() { 6030 return (mViewFlags & CLICKABLE) == CLICKABLE; 6031 } 6032 6033 /** 6034 * Enables or disables click events for this view. When a view 6035 * is clickable it will change its state to "pressed" on every click. 6036 * Subclasses should set the view clickable to visually react to 6037 * user's clicks. 6038 * 6039 * @param clickable true to make the view clickable, false otherwise 6040 * 6041 * @see #isClickable() 6042 * @attr ref android.R.styleable#View_clickable 6043 */ 6044 public void setClickable(boolean clickable) { 6045 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6046 } 6047 6048 /** 6049 * Indicates whether this view reacts to long click events or not. 6050 * 6051 * @return true if the view is long clickable, false otherwise 6052 * 6053 * @see #setLongClickable(boolean) 6054 * @attr ref android.R.styleable#View_longClickable 6055 */ 6056 public boolean isLongClickable() { 6057 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6058 } 6059 6060 /** 6061 * Enables or disables long click events for this view. When a view is long 6062 * clickable it reacts to the user holding down the button for a longer 6063 * duration than a tap. This event can either launch the listener or a 6064 * context menu. 6065 * 6066 * @param longClickable true to make the view long clickable, false otherwise 6067 * @see #isLongClickable() 6068 * @attr ref android.R.styleable#View_longClickable 6069 */ 6070 public void setLongClickable(boolean longClickable) { 6071 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6072 } 6073 6074 /** 6075 * Sets the pressed state for this view. 6076 * 6077 * @see #isClickable() 6078 * @see #setClickable(boolean) 6079 * 6080 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6081 * the View's internal state from a previously set "pressed" state. 6082 */ 6083 public void setPressed(boolean pressed) { 6084 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6085 6086 if (pressed) { 6087 mPrivateFlags |= PFLAG_PRESSED; 6088 } else { 6089 mPrivateFlags &= ~PFLAG_PRESSED; 6090 } 6091 6092 if (needsRefresh) { 6093 refreshDrawableState(); 6094 } 6095 dispatchSetPressed(pressed); 6096 } 6097 6098 /** 6099 * Dispatch setPressed to all of this View's children. 6100 * 6101 * @see #setPressed(boolean) 6102 * 6103 * @param pressed The new pressed state 6104 */ 6105 protected void dispatchSetPressed(boolean pressed) { 6106 } 6107 6108 /** 6109 * Indicates whether the view is currently in pressed state. Unless 6110 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6111 * the pressed state. 6112 * 6113 * @see #setPressed(boolean) 6114 * @see #isClickable() 6115 * @see #setClickable(boolean) 6116 * 6117 * @return true if the view is currently pressed, false otherwise 6118 */ 6119 public boolean isPressed() { 6120 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6121 } 6122 6123 /** 6124 * Indicates whether this view will save its state (that is, 6125 * whether its {@link #onSaveInstanceState} method will be called). 6126 * 6127 * @return Returns true if the view state saving is enabled, else false. 6128 * 6129 * @see #setSaveEnabled(boolean) 6130 * @attr ref android.R.styleable#View_saveEnabled 6131 */ 6132 public boolean isSaveEnabled() { 6133 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6134 } 6135 6136 /** 6137 * Controls whether the saving of this view's state is 6138 * enabled (that is, whether its {@link #onSaveInstanceState} method 6139 * will be called). Note that even if freezing is enabled, the 6140 * view still must have an id assigned to it (via {@link #setId(int)}) 6141 * for its state to be saved. This flag can only disable the 6142 * saving of this view; any child views may still have their state saved. 6143 * 6144 * @param enabled Set to false to <em>disable</em> state saving, or true 6145 * (the default) to allow it. 6146 * 6147 * @see #isSaveEnabled() 6148 * @see #setId(int) 6149 * @see #onSaveInstanceState() 6150 * @attr ref android.R.styleable#View_saveEnabled 6151 */ 6152 public void setSaveEnabled(boolean enabled) { 6153 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6154 } 6155 6156 /** 6157 * Gets whether the framework should discard touches when the view's 6158 * window is obscured by another visible window. 6159 * Refer to the {@link View} security documentation for more details. 6160 * 6161 * @return True if touch filtering is enabled. 6162 * 6163 * @see #setFilterTouchesWhenObscured(boolean) 6164 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6165 */ 6166 @ViewDebug.ExportedProperty 6167 public boolean getFilterTouchesWhenObscured() { 6168 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6169 } 6170 6171 /** 6172 * Sets whether the framework should discard touches when the view's 6173 * window is obscured by another visible window. 6174 * Refer to the {@link View} security documentation for more details. 6175 * 6176 * @param enabled True if touch filtering should be enabled. 6177 * 6178 * @see #getFilterTouchesWhenObscured 6179 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6180 */ 6181 public void setFilterTouchesWhenObscured(boolean enabled) { 6182 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6183 FILTER_TOUCHES_WHEN_OBSCURED); 6184 } 6185 6186 /** 6187 * Indicates whether the entire hierarchy under this view will save its 6188 * state when a state saving traversal occurs from its parent. The default 6189 * is true; if false, these views will not be saved unless 6190 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6191 * 6192 * @return Returns true if the view state saving from parent is enabled, else false. 6193 * 6194 * @see #setSaveFromParentEnabled(boolean) 6195 */ 6196 public boolean isSaveFromParentEnabled() { 6197 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6198 } 6199 6200 /** 6201 * Controls whether the entire hierarchy under this view will save its 6202 * state when a state saving traversal occurs from its parent. The default 6203 * is true; if false, these views will not be saved unless 6204 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6205 * 6206 * @param enabled Set to false to <em>disable</em> state saving, or true 6207 * (the default) to allow it. 6208 * 6209 * @see #isSaveFromParentEnabled() 6210 * @see #setId(int) 6211 * @see #onSaveInstanceState() 6212 */ 6213 public void setSaveFromParentEnabled(boolean enabled) { 6214 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6215 } 6216 6217 6218 /** 6219 * Returns whether this View is able to take focus. 6220 * 6221 * @return True if this view can take focus, or false otherwise. 6222 * @attr ref android.R.styleable#View_focusable 6223 */ 6224 @ViewDebug.ExportedProperty(category = "focus") 6225 public final boolean isFocusable() { 6226 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6227 } 6228 6229 /** 6230 * When a view is focusable, it may not want to take focus when in touch mode. 6231 * For example, a button would like focus when the user is navigating via a D-pad 6232 * so that the user can click on it, but once the user starts touching the screen, 6233 * the button shouldn't take focus 6234 * @return Whether the view is focusable in touch mode. 6235 * @attr ref android.R.styleable#View_focusableInTouchMode 6236 */ 6237 @ViewDebug.ExportedProperty 6238 public final boolean isFocusableInTouchMode() { 6239 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6240 } 6241 6242 /** 6243 * Find the nearest view in the specified direction that can take focus. 6244 * This does not actually give focus to that view. 6245 * 6246 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6247 * 6248 * @return The nearest focusable in the specified direction, or null if none 6249 * can be found. 6250 */ 6251 public View focusSearch(int direction) { 6252 if (mParent != null) { 6253 return mParent.focusSearch(this, direction); 6254 } else { 6255 return null; 6256 } 6257 } 6258 6259 /** 6260 * This method is the last chance for the focused view and its ancestors to 6261 * respond to an arrow key. This is called when the focused view did not 6262 * consume the key internally, nor could the view system find a new view in 6263 * the requested direction to give focus to. 6264 * 6265 * @param focused The currently focused view. 6266 * @param direction The direction focus wants to move. One of FOCUS_UP, 6267 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6268 * @return True if the this view consumed this unhandled move. 6269 */ 6270 public boolean dispatchUnhandledMove(View focused, int direction) { 6271 return false; 6272 } 6273 6274 /** 6275 * If a user manually specified the next view id for a particular direction, 6276 * use the root to look up the view. 6277 * @param root The root view of the hierarchy containing this view. 6278 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6279 * or FOCUS_BACKWARD. 6280 * @return The user specified next view, or null if there is none. 6281 */ 6282 View findUserSetNextFocus(View root, int direction) { 6283 switch (direction) { 6284 case FOCUS_LEFT: 6285 if (mNextFocusLeftId == View.NO_ID) return null; 6286 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6287 case FOCUS_RIGHT: 6288 if (mNextFocusRightId == View.NO_ID) return null; 6289 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6290 case FOCUS_UP: 6291 if (mNextFocusUpId == View.NO_ID) return null; 6292 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6293 case FOCUS_DOWN: 6294 if (mNextFocusDownId == View.NO_ID) return null; 6295 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6296 case FOCUS_FORWARD: 6297 if (mNextFocusForwardId == View.NO_ID) return null; 6298 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6299 case FOCUS_BACKWARD: { 6300 if (mID == View.NO_ID) return null; 6301 final int id = mID; 6302 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6303 @Override 6304 public boolean apply(View t) { 6305 return t.mNextFocusForwardId == id; 6306 } 6307 }); 6308 } 6309 } 6310 return null; 6311 } 6312 6313 private View findViewInsideOutShouldExist(View root, int id) { 6314 if (mMatchIdPredicate == null) { 6315 mMatchIdPredicate = new MatchIdPredicate(); 6316 } 6317 mMatchIdPredicate.mId = id; 6318 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6319 if (result == null) { 6320 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6321 } 6322 return result; 6323 } 6324 6325 /** 6326 * Find and return all focusable views that are descendants of this view, 6327 * possibly including this view if it is focusable itself. 6328 * 6329 * @param direction The direction of the focus 6330 * @return A list of focusable views 6331 */ 6332 public ArrayList<View> getFocusables(int direction) { 6333 ArrayList<View> result = new ArrayList<View>(24); 6334 addFocusables(result, direction); 6335 return result; 6336 } 6337 6338 /** 6339 * Add any focusable views that are descendants of this view (possibly 6340 * including this view if it is focusable itself) to views. If we are in touch mode, 6341 * only add views that are also focusable in touch mode. 6342 * 6343 * @param views Focusable views found so far 6344 * @param direction The direction of the focus 6345 */ 6346 public void addFocusables(ArrayList<View> views, int direction) { 6347 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6348 } 6349 6350 /** 6351 * Adds any focusable views that are descendants of this view (possibly 6352 * including this view if it is focusable itself) to views. This method 6353 * adds all focusable views regardless if we are in touch mode or 6354 * only views focusable in touch mode if we are in touch mode or 6355 * only views that can take accessibility focus if accessibility is enabeld 6356 * depending on the focusable mode paramater. 6357 * 6358 * @param views Focusable views found so far or null if all we are interested is 6359 * the number of focusables. 6360 * @param direction The direction of the focus. 6361 * @param focusableMode The type of focusables to be added. 6362 * 6363 * @see #FOCUSABLES_ALL 6364 * @see #FOCUSABLES_TOUCH_MODE 6365 */ 6366 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6367 if (views == null) { 6368 return; 6369 } 6370 if (!isFocusable()) { 6371 return; 6372 } 6373 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6374 && isInTouchMode() && !isFocusableInTouchMode()) { 6375 return; 6376 } 6377 views.add(this); 6378 } 6379 6380 /** 6381 * Finds the Views that contain given text. The containment is case insensitive. 6382 * The search is performed by either the text that the View renders or the content 6383 * description that describes the view for accessibility purposes and the view does 6384 * not render or both. Clients can specify how the search is to be performed via 6385 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6386 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6387 * 6388 * @param outViews The output list of matching Views. 6389 * @param searched The text to match against. 6390 * 6391 * @see #FIND_VIEWS_WITH_TEXT 6392 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6393 * @see #setContentDescription(CharSequence) 6394 */ 6395 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6396 if (getAccessibilityNodeProvider() != null) { 6397 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6398 outViews.add(this); 6399 } 6400 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6401 && (searched != null && searched.length() > 0) 6402 && (mContentDescription != null && mContentDescription.length() > 0)) { 6403 String searchedLowerCase = searched.toString().toLowerCase(); 6404 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6405 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6406 outViews.add(this); 6407 } 6408 } 6409 } 6410 6411 /** 6412 * Find and return all touchable views that are descendants of this view, 6413 * possibly including this view if it is touchable itself. 6414 * 6415 * @return A list of touchable views 6416 */ 6417 public ArrayList<View> getTouchables() { 6418 ArrayList<View> result = new ArrayList<View>(); 6419 addTouchables(result); 6420 return result; 6421 } 6422 6423 /** 6424 * Add any touchable views that are descendants of this view (possibly 6425 * including this view if it is touchable itself) to views. 6426 * 6427 * @param views Touchable views found so far 6428 */ 6429 public void addTouchables(ArrayList<View> views) { 6430 final int viewFlags = mViewFlags; 6431 6432 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6433 && (viewFlags & ENABLED_MASK) == ENABLED) { 6434 views.add(this); 6435 } 6436 } 6437 6438 /** 6439 * Returns whether this View is accessibility focused. 6440 * 6441 * @return True if this View is accessibility focused. 6442 */ 6443 boolean isAccessibilityFocused() { 6444 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6445 } 6446 6447 /** 6448 * Call this to try to give accessibility focus to this view. 6449 * 6450 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6451 * returns false or the view is no visible or the view already has accessibility 6452 * focus. 6453 * 6454 * See also {@link #focusSearch(int)}, which is what you call to say that you 6455 * have focus, and you want your parent to look for the next one. 6456 * 6457 * @return Whether this view actually took accessibility focus. 6458 * 6459 * @hide 6460 */ 6461 public boolean requestAccessibilityFocus() { 6462 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6463 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6464 return false; 6465 } 6466 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6467 return false; 6468 } 6469 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6470 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6471 ViewRootImpl viewRootImpl = getViewRootImpl(); 6472 if (viewRootImpl != null) { 6473 viewRootImpl.setAccessibilityFocus(this, null); 6474 } 6475 invalidate(); 6476 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6477 notifyAccessibilityStateChanged(); 6478 return true; 6479 } 6480 return false; 6481 } 6482 6483 /** 6484 * Call this to try to clear accessibility focus of this view. 6485 * 6486 * See also {@link #focusSearch(int)}, which is what you call to say that you 6487 * have focus, and you want your parent to look for the next one. 6488 * 6489 * @hide 6490 */ 6491 public void clearAccessibilityFocus() { 6492 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6493 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6494 invalidate(); 6495 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6496 notifyAccessibilityStateChanged(); 6497 } 6498 // Clear the global reference of accessibility focus if this 6499 // view or any of its descendants had accessibility focus. 6500 ViewRootImpl viewRootImpl = getViewRootImpl(); 6501 if (viewRootImpl != null) { 6502 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6503 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6504 viewRootImpl.setAccessibilityFocus(null, null); 6505 } 6506 } 6507 } 6508 6509 private void sendAccessibilityHoverEvent(int eventType) { 6510 // Since we are not delivering to a client accessibility events from not 6511 // important views (unless the clinet request that) we need to fire the 6512 // event from the deepest view exposed to the client. As a consequence if 6513 // the user crosses a not exposed view the client will see enter and exit 6514 // of the exposed predecessor followed by and enter and exit of that same 6515 // predecessor when entering and exiting the not exposed descendant. This 6516 // is fine since the client has a clear idea which view is hovered at the 6517 // price of a couple more events being sent. This is a simple and 6518 // working solution. 6519 View source = this; 6520 while (true) { 6521 if (source.includeForAccessibility()) { 6522 source.sendAccessibilityEvent(eventType); 6523 return; 6524 } 6525 ViewParent parent = source.getParent(); 6526 if (parent instanceof View) { 6527 source = (View) parent; 6528 } else { 6529 return; 6530 } 6531 } 6532 } 6533 6534 /** 6535 * Clears accessibility focus without calling any callback methods 6536 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6537 * is used for clearing accessibility focus when giving this focus to 6538 * another view. 6539 */ 6540 void clearAccessibilityFocusNoCallbacks() { 6541 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6542 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6543 invalidate(); 6544 } 6545 } 6546 6547 /** 6548 * Call this to try to give focus to a specific view or to one of its 6549 * descendants. 6550 * 6551 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6552 * false), or if it is focusable and it is not focusable in touch mode 6553 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6554 * 6555 * See also {@link #focusSearch(int)}, which is what you call to say that you 6556 * have focus, and you want your parent to look for the next one. 6557 * 6558 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6559 * {@link #FOCUS_DOWN} and <code>null</code>. 6560 * 6561 * @return Whether this view or one of its descendants actually took focus. 6562 */ 6563 public final boolean requestFocus() { 6564 return requestFocus(View.FOCUS_DOWN); 6565 } 6566 6567 /** 6568 * Call this to try to give focus to a specific view or to one of its 6569 * descendants and give it a hint about what direction focus is heading. 6570 * 6571 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6572 * false), or if it is focusable and it is not focusable in touch mode 6573 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6574 * 6575 * See also {@link #focusSearch(int)}, which is what you call to say that you 6576 * have focus, and you want your parent to look for the next one. 6577 * 6578 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6579 * <code>null</code> set for the previously focused rectangle. 6580 * 6581 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6582 * @return Whether this view or one of its descendants actually took focus. 6583 */ 6584 public final boolean requestFocus(int direction) { 6585 return requestFocus(direction, null); 6586 } 6587 6588 /** 6589 * Call this to try to give focus to a specific view or to one of its descendants 6590 * and give it hints about the direction and a specific rectangle that the focus 6591 * is coming from. The rectangle can help give larger views a finer grained hint 6592 * about where focus is coming from, and therefore, where to show selection, or 6593 * forward focus change internally. 6594 * 6595 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6596 * false), or if it is focusable and it is not focusable in touch mode 6597 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6598 * 6599 * A View will not take focus if it is not visible. 6600 * 6601 * A View will not take focus if one of its parents has 6602 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6603 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6604 * 6605 * See also {@link #focusSearch(int)}, which is what you call to say that you 6606 * have focus, and you want your parent to look for the next one. 6607 * 6608 * You may wish to override this method if your custom {@link View} has an internal 6609 * {@link View} that it wishes to forward the request to. 6610 * 6611 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6612 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6613 * to give a finer grained hint about where focus is coming from. May be null 6614 * if there is no hint. 6615 * @return Whether this view or one of its descendants actually took focus. 6616 */ 6617 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6618 return requestFocusNoSearch(direction, previouslyFocusedRect); 6619 } 6620 6621 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6622 // need to be focusable 6623 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6624 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6625 return false; 6626 } 6627 6628 // need to be focusable in touch mode if in touch mode 6629 if (isInTouchMode() && 6630 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6631 return false; 6632 } 6633 6634 // need to not have any parents blocking us 6635 if (hasAncestorThatBlocksDescendantFocus()) { 6636 return false; 6637 } 6638 6639 handleFocusGainInternal(direction, previouslyFocusedRect); 6640 return true; 6641 } 6642 6643 /** 6644 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6645 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6646 * touch mode to request focus when they are touched. 6647 * 6648 * @return Whether this view or one of its descendants actually took focus. 6649 * 6650 * @see #isInTouchMode() 6651 * 6652 */ 6653 public final boolean requestFocusFromTouch() { 6654 // Leave touch mode if we need to 6655 if (isInTouchMode()) { 6656 ViewRootImpl viewRoot = getViewRootImpl(); 6657 if (viewRoot != null) { 6658 viewRoot.ensureTouchMode(false); 6659 } 6660 } 6661 return requestFocus(View.FOCUS_DOWN); 6662 } 6663 6664 /** 6665 * @return Whether any ancestor of this view blocks descendant focus. 6666 */ 6667 private boolean hasAncestorThatBlocksDescendantFocus() { 6668 ViewParent ancestor = mParent; 6669 while (ancestor instanceof ViewGroup) { 6670 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6671 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6672 return true; 6673 } else { 6674 ancestor = vgAncestor.getParent(); 6675 } 6676 } 6677 return false; 6678 } 6679 6680 /** 6681 * Gets the mode for determining whether this View is important for accessibility 6682 * which is if it fires accessibility events and if it is reported to 6683 * accessibility services that query the screen. 6684 * 6685 * @return The mode for determining whether a View is important for accessibility. 6686 * 6687 * @attr ref android.R.styleable#View_importantForAccessibility 6688 * 6689 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6690 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6691 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6692 */ 6693 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6694 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6695 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6696 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6697 }) 6698 public int getImportantForAccessibility() { 6699 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6700 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6701 } 6702 6703 /** 6704 * Sets how to determine whether this view is important for accessibility 6705 * which is if it fires accessibility events and if it is reported to 6706 * accessibility services that query the screen. 6707 * 6708 * @param mode How to determine whether this view is important for accessibility. 6709 * 6710 * @attr ref android.R.styleable#View_importantForAccessibility 6711 * 6712 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6713 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6714 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6715 */ 6716 public void setImportantForAccessibility(int mode) { 6717 if (mode != getImportantForAccessibility()) { 6718 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6719 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6720 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6721 notifyAccessibilityStateChanged(); 6722 } 6723 } 6724 6725 /** 6726 * Gets whether this view should be exposed for accessibility. 6727 * 6728 * @return Whether the view is exposed for accessibility. 6729 * 6730 * @hide 6731 */ 6732 public boolean isImportantForAccessibility() { 6733 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6734 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6735 switch (mode) { 6736 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6737 return true; 6738 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6739 return false; 6740 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6741 return isActionableForAccessibility() || hasListenersForAccessibility() 6742 || getAccessibilityNodeProvider() != null; 6743 default: 6744 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6745 + mode); 6746 } 6747 } 6748 6749 /** 6750 * Gets the parent for accessibility purposes. Note that the parent for 6751 * accessibility is not necessary the immediate parent. It is the first 6752 * predecessor that is important for accessibility. 6753 * 6754 * @return The parent for accessibility purposes. 6755 */ 6756 public ViewParent getParentForAccessibility() { 6757 if (mParent instanceof View) { 6758 View parentView = (View) mParent; 6759 if (parentView.includeForAccessibility()) { 6760 return mParent; 6761 } else { 6762 return mParent.getParentForAccessibility(); 6763 } 6764 } 6765 return null; 6766 } 6767 6768 /** 6769 * Adds the children of a given View for accessibility. Since some Views are 6770 * not important for accessibility the children for accessibility are not 6771 * necessarily direct children of the riew, rather they are the first level of 6772 * descendants important for accessibility. 6773 * 6774 * @param children The list of children for accessibility. 6775 */ 6776 public void addChildrenForAccessibility(ArrayList<View> children) { 6777 if (includeForAccessibility()) { 6778 children.add(this); 6779 } 6780 } 6781 6782 /** 6783 * Whether to regard this view for accessibility. A view is regarded for 6784 * accessibility if it is important for accessibility or the querying 6785 * accessibility service has explicitly requested that view not 6786 * important for accessibility are regarded. 6787 * 6788 * @return Whether to regard the view for accessibility. 6789 * 6790 * @hide 6791 */ 6792 public boolean includeForAccessibility() { 6793 if (mAttachInfo != null) { 6794 return mAttachInfo.mIncludeNotImportantViews || isImportantForAccessibility(); 6795 } 6796 return false; 6797 } 6798 6799 /** 6800 * Returns whether the View is considered actionable from 6801 * accessibility perspective. Such view are important for 6802 * accessibility. 6803 * 6804 * @return True if the view is actionable for accessibility. 6805 * 6806 * @hide 6807 */ 6808 public boolean isActionableForAccessibility() { 6809 return (isClickable() || isLongClickable() || isFocusable()); 6810 } 6811 6812 /** 6813 * Returns whether the View has registered callbacks wich makes it 6814 * important for accessibility. 6815 * 6816 * @return True if the view is actionable for accessibility. 6817 */ 6818 private boolean hasListenersForAccessibility() { 6819 ListenerInfo info = getListenerInfo(); 6820 return mTouchDelegate != null || info.mOnKeyListener != null 6821 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6822 || info.mOnHoverListener != null || info.mOnDragListener != null; 6823 } 6824 6825 /** 6826 * Notifies accessibility services that some view's important for 6827 * accessibility state has changed. Note that such notifications 6828 * are made at most once every 6829 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6830 * to avoid unnecessary load to the system. Also once a view has 6831 * made a notifucation this method is a NOP until the notification has 6832 * been sent to clients. 6833 * 6834 * @hide 6835 * 6836 * TODO: Makse sure this method is called for any view state change 6837 * that is interesting for accessilility purposes. 6838 */ 6839 public void notifyAccessibilityStateChanged() { 6840 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6841 return; 6842 } 6843 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_STATE_CHANGED) == 0) { 6844 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_STATE_CHANGED; 6845 if (mParent != null) { 6846 mParent.childAccessibilityStateChanged(this); 6847 } 6848 } 6849 } 6850 6851 /** 6852 * Reset the state indicating the this view has requested clients 6853 * interested in its accessibility state to be notified. 6854 * 6855 * @hide 6856 */ 6857 public void resetAccessibilityStateChanged() { 6858 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_STATE_CHANGED; 6859 } 6860 6861 /** 6862 * Performs the specified accessibility action on the view. For 6863 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6864 * <p> 6865 * If an {@link AccessibilityDelegate} has been specified via calling 6866 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6867 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6868 * is responsible for handling this call. 6869 * </p> 6870 * 6871 * @param action The action to perform. 6872 * @param arguments Optional action arguments. 6873 * @return Whether the action was performed. 6874 */ 6875 public boolean performAccessibilityAction(int action, Bundle arguments) { 6876 if (mAccessibilityDelegate != null) { 6877 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6878 } else { 6879 return performAccessibilityActionInternal(action, arguments); 6880 } 6881 } 6882 6883 /** 6884 * @see #performAccessibilityAction(int, Bundle) 6885 * 6886 * Note: Called from the default {@link AccessibilityDelegate}. 6887 */ 6888 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6889 switch (action) { 6890 case AccessibilityNodeInfo.ACTION_CLICK: { 6891 if (isClickable()) { 6892 performClick(); 6893 return true; 6894 } 6895 } break; 6896 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6897 if (isLongClickable()) { 6898 performLongClick(); 6899 return true; 6900 } 6901 } break; 6902 case AccessibilityNodeInfo.ACTION_FOCUS: { 6903 if (!hasFocus()) { 6904 // Get out of touch mode since accessibility 6905 // wants to move focus around. 6906 getViewRootImpl().ensureTouchMode(false); 6907 return requestFocus(); 6908 } 6909 } break; 6910 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6911 if (hasFocus()) { 6912 clearFocus(); 6913 return !isFocused(); 6914 } 6915 } break; 6916 case AccessibilityNodeInfo.ACTION_SELECT: { 6917 if (!isSelected()) { 6918 setSelected(true); 6919 return isSelected(); 6920 } 6921 } break; 6922 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6923 if (isSelected()) { 6924 setSelected(false); 6925 return !isSelected(); 6926 } 6927 } break; 6928 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6929 if (!isAccessibilityFocused()) { 6930 return requestAccessibilityFocus(); 6931 } 6932 } break; 6933 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6934 if (isAccessibilityFocused()) { 6935 clearAccessibilityFocus(); 6936 return true; 6937 } 6938 } break; 6939 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6940 if (arguments != null) { 6941 final int granularity = arguments.getInt( 6942 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6943 return nextAtGranularity(granularity); 6944 } 6945 } break; 6946 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6947 if (arguments != null) { 6948 final int granularity = arguments.getInt( 6949 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6950 return previousAtGranularity(granularity); 6951 } 6952 } break; 6953 } 6954 return false; 6955 } 6956 6957 private boolean nextAtGranularity(int granularity) { 6958 CharSequence text = getIterableTextForAccessibility(); 6959 if (text == null || text.length() == 0) { 6960 return false; 6961 } 6962 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6963 if (iterator == null) { 6964 return false; 6965 } 6966 final int current = getAccessibilityCursorPosition(); 6967 final int[] range = iterator.following(current); 6968 if (range == null) { 6969 return false; 6970 } 6971 final int start = range[0]; 6972 final int end = range[1]; 6973 setAccessibilityCursorPosition(end); 6974 sendViewTextTraversedAtGranularityEvent( 6975 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6976 granularity, start, end); 6977 return true; 6978 } 6979 6980 private boolean previousAtGranularity(int granularity) { 6981 CharSequence text = getIterableTextForAccessibility(); 6982 if (text == null || text.length() == 0) { 6983 return false; 6984 } 6985 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6986 if (iterator == null) { 6987 return false; 6988 } 6989 int current = getAccessibilityCursorPosition(); 6990 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 6991 current = text.length(); 6992 } else if (granularity == AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER) { 6993 // When traversing by character we always put the cursor after the character 6994 // to ease edit and have to compensate before asking the for previous segment. 6995 current--; 6996 } 6997 final int[] range = iterator.preceding(current); 6998 if (range == null) { 6999 return false; 7000 } 7001 final int start = range[0]; 7002 final int end = range[1]; 7003 // Always put the cursor after the character to ease edit. 7004 if (granularity == AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER) { 7005 setAccessibilityCursorPosition(end); 7006 } else { 7007 setAccessibilityCursorPosition(start); 7008 } 7009 sendViewTextTraversedAtGranularityEvent( 7010 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 7011 granularity, start, end); 7012 return true; 7013 } 7014 7015 /** 7016 * Gets the text reported for accessibility purposes. 7017 * 7018 * @return The accessibility text. 7019 * 7020 * @hide 7021 */ 7022 public CharSequence getIterableTextForAccessibility() { 7023 return getContentDescription(); 7024 } 7025 7026 /** 7027 * @hide 7028 */ 7029 public int getAccessibilityCursorPosition() { 7030 return mAccessibilityCursorPosition; 7031 } 7032 7033 /** 7034 * @hide 7035 */ 7036 public void setAccessibilityCursorPosition(int position) { 7037 mAccessibilityCursorPosition = position; 7038 } 7039 7040 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7041 int fromIndex, int toIndex) { 7042 if (mParent == null) { 7043 return; 7044 } 7045 AccessibilityEvent event = AccessibilityEvent.obtain( 7046 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7047 onInitializeAccessibilityEvent(event); 7048 onPopulateAccessibilityEvent(event); 7049 event.setFromIndex(fromIndex); 7050 event.setToIndex(toIndex); 7051 event.setAction(action); 7052 event.setMovementGranularity(granularity); 7053 mParent.requestSendAccessibilityEvent(this, event); 7054 } 7055 7056 /** 7057 * @hide 7058 */ 7059 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7060 switch (granularity) { 7061 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7062 CharSequence text = getIterableTextForAccessibility(); 7063 if (text != null && text.length() > 0) { 7064 CharacterTextSegmentIterator iterator = 7065 CharacterTextSegmentIterator.getInstance( 7066 mContext.getResources().getConfiguration().locale); 7067 iterator.initialize(text.toString()); 7068 return iterator; 7069 } 7070 } break; 7071 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7072 CharSequence text = getIterableTextForAccessibility(); 7073 if (text != null && text.length() > 0) { 7074 WordTextSegmentIterator iterator = 7075 WordTextSegmentIterator.getInstance( 7076 mContext.getResources().getConfiguration().locale); 7077 iterator.initialize(text.toString()); 7078 return iterator; 7079 } 7080 } break; 7081 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7082 CharSequence text = getIterableTextForAccessibility(); 7083 if (text != null && text.length() > 0) { 7084 ParagraphTextSegmentIterator iterator = 7085 ParagraphTextSegmentIterator.getInstance(); 7086 iterator.initialize(text.toString()); 7087 return iterator; 7088 } 7089 } break; 7090 } 7091 return null; 7092 } 7093 7094 /** 7095 * @hide 7096 */ 7097 public void dispatchStartTemporaryDetach() { 7098 clearAccessibilityFocus(); 7099 clearDisplayList(); 7100 7101 onStartTemporaryDetach(); 7102 } 7103 7104 /** 7105 * This is called when a container is going to temporarily detach a child, with 7106 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7107 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7108 * {@link #onDetachedFromWindow()} when the container is done. 7109 */ 7110 public void onStartTemporaryDetach() { 7111 removeUnsetPressCallback(); 7112 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7113 } 7114 7115 /** 7116 * @hide 7117 */ 7118 public void dispatchFinishTemporaryDetach() { 7119 onFinishTemporaryDetach(); 7120 } 7121 7122 /** 7123 * Called after {@link #onStartTemporaryDetach} when the container is done 7124 * changing the view. 7125 */ 7126 public void onFinishTemporaryDetach() { 7127 } 7128 7129 /** 7130 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7131 * for this view's window. Returns null if the view is not currently attached 7132 * to the window. Normally you will not need to use this directly, but 7133 * just use the standard high-level event callbacks like 7134 * {@link #onKeyDown(int, KeyEvent)}. 7135 */ 7136 public KeyEvent.DispatcherState getKeyDispatcherState() { 7137 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7138 } 7139 7140 /** 7141 * Dispatch a key event before it is processed by any input method 7142 * associated with the view hierarchy. This can be used to intercept 7143 * key events in special situations before the IME consumes them; a 7144 * typical example would be handling the BACK key to update the application's 7145 * UI instead of allowing the IME to see it and close itself. 7146 * 7147 * @param event The key event to be dispatched. 7148 * @return True if the event was handled, false otherwise. 7149 */ 7150 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7151 return onKeyPreIme(event.getKeyCode(), event); 7152 } 7153 7154 /** 7155 * Dispatch a key event to the next view on the focus path. This path runs 7156 * from the top of the view tree down to the currently focused view. If this 7157 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7158 * the next node down the focus path. This method also fires any key 7159 * listeners. 7160 * 7161 * @param event The key event to be dispatched. 7162 * @return True if the event was handled, false otherwise. 7163 */ 7164 public boolean dispatchKeyEvent(KeyEvent event) { 7165 if (mInputEventConsistencyVerifier != null) { 7166 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7167 } 7168 7169 // Give any attached key listener a first crack at the event. 7170 //noinspection SimplifiableIfStatement 7171 ListenerInfo li = mListenerInfo; 7172 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7173 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7174 return true; 7175 } 7176 7177 if (event.dispatch(this, mAttachInfo != null 7178 ? mAttachInfo.mKeyDispatchState : null, this)) { 7179 return true; 7180 } 7181 7182 if (mInputEventConsistencyVerifier != null) { 7183 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7184 } 7185 return false; 7186 } 7187 7188 /** 7189 * Dispatches a key shortcut event. 7190 * 7191 * @param event The key event to be dispatched. 7192 * @return True if the event was handled by the view, false otherwise. 7193 */ 7194 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7195 return onKeyShortcut(event.getKeyCode(), event); 7196 } 7197 7198 /** 7199 * Pass the touch screen motion event down to the target view, or this 7200 * view if it is the target. 7201 * 7202 * @param event The motion event to be dispatched. 7203 * @return True if the event was handled by the view, false otherwise. 7204 */ 7205 public boolean dispatchTouchEvent(MotionEvent event) { 7206 if (mInputEventConsistencyVerifier != null) { 7207 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7208 } 7209 7210 if (onFilterTouchEventForSecurity(event)) { 7211 //noinspection SimplifiableIfStatement 7212 ListenerInfo li = mListenerInfo; 7213 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7214 && li.mOnTouchListener.onTouch(this, event)) { 7215 return true; 7216 } 7217 7218 if (onTouchEvent(event)) { 7219 return true; 7220 } 7221 } 7222 7223 if (mInputEventConsistencyVerifier != null) { 7224 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7225 } 7226 return false; 7227 } 7228 7229 /** 7230 * Filter the touch event to apply security policies. 7231 * 7232 * @param event The motion event to be filtered. 7233 * @return True if the event should be dispatched, false if the event should be dropped. 7234 * 7235 * @see #getFilterTouchesWhenObscured 7236 */ 7237 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7238 //noinspection RedundantIfStatement 7239 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7240 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7241 // Window is obscured, drop this touch. 7242 return false; 7243 } 7244 return true; 7245 } 7246 7247 /** 7248 * Pass a trackball motion event down to the focused view. 7249 * 7250 * @param event The motion event to be dispatched. 7251 * @return True if the event was handled by the view, false otherwise. 7252 */ 7253 public boolean dispatchTrackballEvent(MotionEvent event) { 7254 if (mInputEventConsistencyVerifier != null) { 7255 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7256 } 7257 7258 return onTrackballEvent(event); 7259 } 7260 7261 /** 7262 * Dispatch a generic motion event. 7263 * <p> 7264 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7265 * are delivered to the view under the pointer. All other generic motion events are 7266 * delivered to the focused view. Hover events are handled specially and are delivered 7267 * to {@link #onHoverEvent(MotionEvent)}. 7268 * </p> 7269 * 7270 * @param event The motion event to be dispatched. 7271 * @return True if the event was handled by the view, false otherwise. 7272 */ 7273 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7274 if (mInputEventConsistencyVerifier != null) { 7275 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7276 } 7277 7278 final int source = event.getSource(); 7279 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7280 final int action = event.getAction(); 7281 if (action == MotionEvent.ACTION_HOVER_ENTER 7282 || action == MotionEvent.ACTION_HOVER_MOVE 7283 || action == MotionEvent.ACTION_HOVER_EXIT) { 7284 if (dispatchHoverEvent(event)) { 7285 return true; 7286 } 7287 } else if (dispatchGenericPointerEvent(event)) { 7288 return true; 7289 } 7290 } else if (dispatchGenericFocusedEvent(event)) { 7291 return true; 7292 } 7293 7294 if (dispatchGenericMotionEventInternal(event)) { 7295 return true; 7296 } 7297 7298 if (mInputEventConsistencyVerifier != null) { 7299 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7300 } 7301 return false; 7302 } 7303 7304 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7305 //noinspection SimplifiableIfStatement 7306 ListenerInfo li = mListenerInfo; 7307 if (li != null && li.mOnGenericMotionListener != null 7308 && (mViewFlags & ENABLED_MASK) == ENABLED 7309 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7310 return true; 7311 } 7312 7313 if (onGenericMotionEvent(event)) { 7314 return true; 7315 } 7316 7317 if (mInputEventConsistencyVerifier != null) { 7318 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7319 } 7320 return false; 7321 } 7322 7323 /** 7324 * Dispatch a hover event. 7325 * <p> 7326 * Do not call this method directly. 7327 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7328 * </p> 7329 * 7330 * @param event The motion event to be dispatched. 7331 * @return True if the event was handled by the view, false otherwise. 7332 */ 7333 protected boolean dispatchHoverEvent(MotionEvent event) { 7334 //noinspection SimplifiableIfStatement 7335 ListenerInfo li = mListenerInfo; 7336 if (li != null && li.mOnHoverListener != null 7337 && (mViewFlags & ENABLED_MASK) == ENABLED 7338 && li.mOnHoverListener.onHover(this, event)) { 7339 return true; 7340 } 7341 7342 return onHoverEvent(event); 7343 } 7344 7345 /** 7346 * Returns true if the view has a child to which it has recently sent 7347 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7348 * it does not have a hovered child, then it must be the innermost hovered view. 7349 * @hide 7350 */ 7351 protected boolean hasHoveredChild() { 7352 return false; 7353 } 7354 7355 /** 7356 * Dispatch a generic motion event to the view under the first pointer. 7357 * <p> 7358 * Do not call this method directly. 7359 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7360 * </p> 7361 * 7362 * @param event The motion event to be dispatched. 7363 * @return True if the event was handled by the view, false otherwise. 7364 */ 7365 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7366 return false; 7367 } 7368 7369 /** 7370 * Dispatch a generic motion event to the currently focused view. 7371 * <p> 7372 * Do not call this method directly. 7373 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7374 * </p> 7375 * 7376 * @param event The motion event to be dispatched. 7377 * @return True if the event was handled by the view, false otherwise. 7378 */ 7379 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7380 return false; 7381 } 7382 7383 /** 7384 * Dispatch a pointer event. 7385 * <p> 7386 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7387 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7388 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7389 * and should not be expected to handle other pointing device features. 7390 * </p> 7391 * 7392 * @param event The motion event to be dispatched. 7393 * @return True if the event was handled by the view, false otherwise. 7394 * @hide 7395 */ 7396 public final boolean dispatchPointerEvent(MotionEvent event) { 7397 if (event.isTouchEvent()) { 7398 return dispatchTouchEvent(event); 7399 } else { 7400 return dispatchGenericMotionEvent(event); 7401 } 7402 } 7403 7404 /** 7405 * Called when the window containing this view gains or loses window focus. 7406 * ViewGroups should override to route to their children. 7407 * 7408 * @param hasFocus True if the window containing this view now has focus, 7409 * false otherwise. 7410 */ 7411 public void dispatchWindowFocusChanged(boolean hasFocus) { 7412 onWindowFocusChanged(hasFocus); 7413 } 7414 7415 /** 7416 * Called when the window containing this view gains or loses focus. Note 7417 * that this is separate from view focus: to receive key events, both 7418 * your view and its window must have focus. If a window is displayed 7419 * on top of yours that takes input focus, then your own window will lose 7420 * focus but the view focus will remain unchanged. 7421 * 7422 * @param hasWindowFocus True if the window containing this view now has 7423 * focus, false otherwise. 7424 */ 7425 public void onWindowFocusChanged(boolean hasWindowFocus) { 7426 InputMethodManager imm = InputMethodManager.peekInstance(); 7427 if (!hasWindowFocus) { 7428 if (isPressed()) { 7429 setPressed(false); 7430 } 7431 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7432 imm.focusOut(this); 7433 } 7434 removeLongPressCallback(); 7435 removeTapCallback(); 7436 onFocusLost(); 7437 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7438 imm.focusIn(this); 7439 } 7440 refreshDrawableState(); 7441 } 7442 7443 /** 7444 * Returns true if this view is in a window that currently has window focus. 7445 * Note that this is not the same as the view itself having focus. 7446 * 7447 * @return True if this view is in a window that currently has window focus. 7448 */ 7449 public boolean hasWindowFocus() { 7450 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7451 } 7452 7453 /** 7454 * Dispatch a view visibility change down the view hierarchy. 7455 * ViewGroups should override to route to their children. 7456 * @param changedView The view whose visibility changed. Could be 'this' or 7457 * an ancestor view. 7458 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7459 * {@link #INVISIBLE} or {@link #GONE}. 7460 */ 7461 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7462 onVisibilityChanged(changedView, visibility); 7463 } 7464 7465 /** 7466 * Called when the visibility of the view or an ancestor of the view is changed. 7467 * @param changedView The view whose visibility changed. Could be 'this' or 7468 * an ancestor view. 7469 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7470 * {@link #INVISIBLE} or {@link #GONE}. 7471 */ 7472 protected void onVisibilityChanged(View changedView, int visibility) { 7473 if (visibility == VISIBLE) { 7474 if (mAttachInfo != null) { 7475 initialAwakenScrollBars(); 7476 } else { 7477 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7478 } 7479 } 7480 } 7481 7482 /** 7483 * Dispatch a hint about whether this view is displayed. For instance, when 7484 * a View moves out of the screen, it might receives a display hint indicating 7485 * the view is not displayed. Applications should not <em>rely</em> on this hint 7486 * as there is no guarantee that they will receive one. 7487 * 7488 * @param hint A hint about whether or not this view is displayed: 7489 * {@link #VISIBLE} or {@link #INVISIBLE}. 7490 */ 7491 public void dispatchDisplayHint(int hint) { 7492 onDisplayHint(hint); 7493 } 7494 7495 /** 7496 * Gives this view a hint about whether is displayed or not. For instance, when 7497 * a View moves out of the screen, it might receives a display hint indicating 7498 * the view is not displayed. Applications should not <em>rely</em> on this hint 7499 * as there is no guarantee that they will receive one. 7500 * 7501 * @param hint A hint about whether or not this view is displayed: 7502 * {@link #VISIBLE} or {@link #INVISIBLE}. 7503 */ 7504 protected void onDisplayHint(int hint) { 7505 } 7506 7507 /** 7508 * Dispatch a window visibility change down the view hierarchy. 7509 * ViewGroups should override to route to their children. 7510 * 7511 * @param visibility The new visibility of the window. 7512 * 7513 * @see #onWindowVisibilityChanged(int) 7514 */ 7515 public void dispatchWindowVisibilityChanged(int visibility) { 7516 onWindowVisibilityChanged(visibility); 7517 } 7518 7519 /** 7520 * Called when the window containing has change its visibility 7521 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7522 * that this tells you whether or not your window is being made visible 7523 * to the window manager; this does <em>not</em> tell you whether or not 7524 * your window is obscured by other windows on the screen, even if it 7525 * is itself visible. 7526 * 7527 * @param visibility The new visibility of the window. 7528 */ 7529 protected void onWindowVisibilityChanged(int visibility) { 7530 if (visibility == VISIBLE) { 7531 initialAwakenScrollBars(); 7532 } 7533 } 7534 7535 /** 7536 * Returns the current visibility of the window this view is attached to 7537 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7538 * 7539 * @return Returns the current visibility of the view's window. 7540 */ 7541 public int getWindowVisibility() { 7542 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7543 } 7544 7545 /** 7546 * Retrieve the overall visible display size in which the window this view is 7547 * attached to has been positioned in. This takes into account screen 7548 * decorations above the window, for both cases where the window itself 7549 * is being position inside of them or the window is being placed under 7550 * then and covered insets are used for the window to position its content 7551 * inside. In effect, this tells you the available area where content can 7552 * be placed and remain visible to users. 7553 * 7554 * <p>This function requires an IPC back to the window manager to retrieve 7555 * the requested information, so should not be used in performance critical 7556 * code like drawing. 7557 * 7558 * @param outRect Filled in with the visible display frame. If the view 7559 * is not attached to a window, this is simply the raw display size. 7560 */ 7561 public void getWindowVisibleDisplayFrame(Rect outRect) { 7562 if (mAttachInfo != null) { 7563 try { 7564 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7565 } catch (RemoteException e) { 7566 return; 7567 } 7568 // XXX This is really broken, and probably all needs to be done 7569 // in the window manager, and we need to know more about whether 7570 // we want the area behind or in front of the IME. 7571 final Rect insets = mAttachInfo.mVisibleInsets; 7572 outRect.left += insets.left; 7573 outRect.top += insets.top; 7574 outRect.right -= insets.right; 7575 outRect.bottom -= insets.bottom; 7576 return; 7577 } 7578 // The view is not attached to a display so we don't have a context. 7579 // Make a best guess about the display size. 7580 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 7581 d.getRectSize(outRect); 7582 } 7583 7584 /** 7585 * Dispatch a notification about a resource configuration change down 7586 * the view hierarchy. 7587 * ViewGroups should override to route to their children. 7588 * 7589 * @param newConfig The new resource configuration. 7590 * 7591 * @see #onConfigurationChanged(android.content.res.Configuration) 7592 */ 7593 public void dispatchConfigurationChanged(Configuration newConfig) { 7594 onConfigurationChanged(newConfig); 7595 } 7596 7597 /** 7598 * Called when the current configuration of the resources being used 7599 * by the application have changed. You can use this to decide when 7600 * to reload resources that can changed based on orientation and other 7601 * configuration characterstics. You only need to use this if you are 7602 * not relying on the normal {@link android.app.Activity} mechanism of 7603 * recreating the activity instance upon a configuration change. 7604 * 7605 * @param newConfig The new resource configuration. 7606 */ 7607 protected void onConfigurationChanged(Configuration newConfig) { 7608 } 7609 7610 /** 7611 * Private function to aggregate all per-view attributes in to the view 7612 * root. 7613 */ 7614 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7615 performCollectViewAttributes(attachInfo, visibility); 7616 } 7617 7618 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7619 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7620 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7621 attachInfo.mKeepScreenOn = true; 7622 } 7623 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7624 ListenerInfo li = mListenerInfo; 7625 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7626 attachInfo.mHasSystemUiListeners = true; 7627 } 7628 } 7629 } 7630 7631 void needGlobalAttributesUpdate(boolean force) { 7632 final AttachInfo ai = mAttachInfo; 7633 if (ai != null && !ai.mRecomputeGlobalAttributes) { 7634 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7635 || ai.mHasSystemUiListeners) { 7636 ai.mRecomputeGlobalAttributes = true; 7637 } 7638 } 7639 } 7640 7641 /** 7642 * Returns whether the device is currently in touch mode. Touch mode is entered 7643 * once the user begins interacting with the device by touch, and affects various 7644 * things like whether focus is always visible to the user. 7645 * 7646 * @return Whether the device is in touch mode. 7647 */ 7648 @ViewDebug.ExportedProperty 7649 public boolean isInTouchMode() { 7650 if (mAttachInfo != null) { 7651 return mAttachInfo.mInTouchMode; 7652 } else { 7653 return ViewRootImpl.isInTouchMode(); 7654 } 7655 } 7656 7657 /** 7658 * Returns the context the view is running in, through which it can 7659 * access the current theme, resources, etc. 7660 * 7661 * @return The view's Context. 7662 */ 7663 @ViewDebug.CapturedViewProperty 7664 public final Context getContext() { 7665 return mContext; 7666 } 7667 7668 /** 7669 * Handle a key event before it is processed by any input method 7670 * associated with the view hierarchy. This can be used to intercept 7671 * key events in special situations before the IME consumes them; a 7672 * typical example would be handling the BACK key to update the application's 7673 * UI instead of allowing the IME to see it and close itself. 7674 * 7675 * @param keyCode The value in event.getKeyCode(). 7676 * @param event Description of the key event. 7677 * @return If you handled the event, return true. If you want to allow the 7678 * event to be handled by the next receiver, return false. 7679 */ 7680 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7681 return false; 7682 } 7683 7684 /** 7685 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7686 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7687 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7688 * is released, if the view is enabled and clickable. 7689 * 7690 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7691 * although some may elect to do so in some situations. Do not rely on this to 7692 * catch software key presses. 7693 * 7694 * @param keyCode A key code that represents the button pressed, from 7695 * {@link android.view.KeyEvent}. 7696 * @param event The KeyEvent object that defines the button action. 7697 */ 7698 public boolean onKeyDown(int keyCode, KeyEvent event) { 7699 boolean result = false; 7700 7701 switch (keyCode) { 7702 case KeyEvent.KEYCODE_DPAD_CENTER: 7703 case KeyEvent.KEYCODE_ENTER: { 7704 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7705 return true; 7706 } 7707 // Long clickable items don't necessarily have to be clickable 7708 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7709 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7710 (event.getRepeatCount() == 0)) { 7711 setPressed(true); 7712 checkForLongClick(0); 7713 return true; 7714 } 7715 break; 7716 } 7717 } 7718 return result; 7719 } 7720 7721 /** 7722 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7723 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7724 * the event). 7725 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7726 * although some may elect to do so in some situations. Do not rely on this to 7727 * catch software key presses. 7728 */ 7729 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7730 return false; 7731 } 7732 7733 /** 7734 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7735 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7736 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7737 * {@link KeyEvent#KEYCODE_ENTER} is released. 7738 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7739 * although some may elect to do so in some situations. Do not rely on this to 7740 * catch software key presses. 7741 * 7742 * @param keyCode A key code that represents the button pressed, from 7743 * {@link android.view.KeyEvent}. 7744 * @param event The KeyEvent object that defines the button action. 7745 */ 7746 public boolean onKeyUp(int keyCode, KeyEvent event) { 7747 boolean result = false; 7748 7749 switch (keyCode) { 7750 case KeyEvent.KEYCODE_DPAD_CENTER: 7751 case KeyEvent.KEYCODE_ENTER: { 7752 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7753 return true; 7754 } 7755 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7756 setPressed(false); 7757 7758 if (!mHasPerformedLongPress) { 7759 // This is a tap, so remove the longpress check 7760 removeLongPressCallback(); 7761 7762 result = performClick(); 7763 } 7764 } 7765 break; 7766 } 7767 } 7768 return result; 7769 } 7770 7771 /** 7772 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7773 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7774 * the event). 7775 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7776 * although some may elect to do so in some situations. Do not rely on this to 7777 * catch software key presses. 7778 * 7779 * @param keyCode A key code that represents the button pressed, from 7780 * {@link android.view.KeyEvent}. 7781 * @param repeatCount The number of times the action was made. 7782 * @param event The KeyEvent object that defines the button action. 7783 */ 7784 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7785 return false; 7786 } 7787 7788 /** 7789 * Called on the focused view when a key shortcut event is not handled. 7790 * Override this method to implement local key shortcuts for the View. 7791 * Key shortcuts can also be implemented by setting the 7792 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7793 * 7794 * @param keyCode The value in event.getKeyCode(). 7795 * @param event Description of the key event. 7796 * @return If you handled the event, return true. If you want to allow the 7797 * event to be handled by the next receiver, return false. 7798 */ 7799 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7800 return false; 7801 } 7802 7803 /** 7804 * Check whether the called view is a text editor, in which case it 7805 * would make sense to automatically display a soft input window for 7806 * it. Subclasses should override this if they implement 7807 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7808 * a call on that method would return a non-null InputConnection, and 7809 * they are really a first-class editor that the user would normally 7810 * start typing on when the go into a window containing your view. 7811 * 7812 * <p>The default implementation always returns false. This does 7813 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7814 * will not be called or the user can not otherwise perform edits on your 7815 * view; it is just a hint to the system that this is not the primary 7816 * purpose of this view. 7817 * 7818 * @return Returns true if this view is a text editor, else false. 7819 */ 7820 public boolean onCheckIsTextEditor() { 7821 return false; 7822 } 7823 7824 /** 7825 * Create a new InputConnection for an InputMethod to interact 7826 * with the view. The default implementation returns null, since it doesn't 7827 * support input methods. You can override this to implement such support. 7828 * This is only needed for views that take focus and text input. 7829 * 7830 * <p>When implementing this, you probably also want to implement 7831 * {@link #onCheckIsTextEditor()} to indicate you will return a 7832 * non-null InputConnection. 7833 * 7834 * @param outAttrs Fill in with attribute information about the connection. 7835 */ 7836 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7837 return null; 7838 } 7839 7840 /** 7841 * Called by the {@link android.view.inputmethod.InputMethodManager} 7842 * when a view who is not the current 7843 * input connection target is trying to make a call on the manager. The 7844 * default implementation returns false; you can override this to return 7845 * true for certain views if you are performing InputConnection proxying 7846 * to them. 7847 * @param view The View that is making the InputMethodManager call. 7848 * @return Return true to allow the call, false to reject. 7849 */ 7850 public boolean checkInputConnectionProxy(View view) { 7851 return false; 7852 } 7853 7854 /** 7855 * Show the context menu for this view. It is not safe to hold on to the 7856 * menu after returning from this method. 7857 * 7858 * You should normally not overload this method. Overload 7859 * {@link #onCreateContextMenu(ContextMenu)} or define an 7860 * {@link OnCreateContextMenuListener} to add items to the context menu. 7861 * 7862 * @param menu The context menu to populate 7863 */ 7864 public void createContextMenu(ContextMenu menu) { 7865 ContextMenuInfo menuInfo = getContextMenuInfo(); 7866 7867 // Sets the current menu info so all items added to menu will have 7868 // my extra info set. 7869 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7870 7871 onCreateContextMenu(menu); 7872 ListenerInfo li = mListenerInfo; 7873 if (li != null && li.mOnCreateContextMenuListener != null) { 7874 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7875 } 7876 7877 // Clear the extra information so subsequent items that aren't mine don't 7878 // have my extra info. 7879 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7880 7881 if (mParent != null) { 7882 mParent.createContextMenu(menu); 7883 } 7884 } 7885 7886 /** 7887 * Views should implement this if they have extra information to associate 7888 * with the context menu. The return result is supplied as a parameter to 7889 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7890 * callback. 7891 * 7892 * @return Extra information about the item for which the context menu 7893 * should be shown. This information will vary across different 7894 * subclasses of View. 7895 */ 7896 protected ContextMenuInfo getContextMenuInfo() { 7897 return null; 7898 } 7899 7900 /** 7901 * Views should implement this if the view itself is going to add items to 7902 * the context menu. 7903 * 7904 * @param menu the context menu to populate 7905 */ 7906 protected void onCreateContextMenu(ContextMenu menu) { 7907 } 7908 7909 /** 7910 * Implement this method to handle trackball motion events. The 7911 * <em>relative</em> movement of the trackball since the last event 7912 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7913 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7914 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7915 * they will often be fractional values, representing the more fine-grained 7916 * movement information available from a trackball). 7917 * 7918 * @param event The motion event. 7919 * @return True if the event was handled, false otherwise. 7920 */ 7921 public boolean onTrackballEvent(MotionEvent event) { 7922 return false; 7923 } 7924 7925 /** 7926 * Implement this method to handle generic motion events. 7927 * <p> 7928 * Generic motion events describe joystick movements, mouse hovers, track pad 7929 * touches, scroll wheel movements and other input events. The 7930 * {@link MotionEvent#getSource() source} of the motion event specifies 7931 * the class of input that was received. Implementations of this method 7932 * must examine the bits in the source before processing the event. 7933 * The following code example shows how this is done. 7934 * </p><p> 7935 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7936 * are delivered to the view under the pointer. All other generic motion events are 7937 * delivered to the focused view. 7938 * </p> 7939 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7940 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7941 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7942 * // process the joystick movement... 7943 * return true; 7944 * } 7945 * } 7946 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7947 * switch (event.getAction()) { 7948 * case MotionEvent.ACTION_HOVER_MOVE: 7949 * // process the mouse hover movement... 7950 * return true; 7951 * case MotionEvent.ACTION_SCROLL: 7952 * // process the scroll wheel movement... 7953 * return true; 7954 * } 7955 * } 7956 * return super.onGenericMotionEvent(event); 7957 * }</pre> 7958 * 7959 * @param event The generic motion event being processed. 7960 * @return True if the event was handled, false otherwise. 7961 */ 7962 public boolean onGenericMotionEvent(MotionEvent event) { 7963 return false; 7964 } 7965 7966 /** 7967 * Implement this method to handle hover events. 7968 * <p> 7969 * This method is called whenever a pointer is hovering into, over, or out of the 7970 * bounds of a view and the view is not currently being touched. 7971 * Hover events are represented as pointer events with action 7972 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7973 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7974 * </p> 7975 * <ul> 7976 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7977 * when the pointer enters the bounds of the view.</li> 7978 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7979 * when the pointer has already entered the bounds of the view and has moved.</li> 7980 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7981 * when the pointer has exited the bounds of the view or when the pointer is 7982 * about to go down due to a button click, tap, or similar user action that 7983 * causes the view to be touched.</li> 7984 * </ul> 7985 * <p> 7986 * The view should implement this method to return true to indicate that it is 7987 * handling the hover event, such as by changing its drawable state. 7988 * </p><p> 7989 * The default implementation calls {@link #setHovered} to update the hovered state 7990 * of the view when a hover enter or hover exit event is received, if the view 7991 * is enabled and is clickable. The default implementation also sends hover 7992 * accessibility events. 7993 * </p> 7994 * 7995 * @param event The motion event that describes the hover. 7996 * @return True if the view handled the hover event. 7997 * 7998 * @see #isHovered 7999 * @see #setHovered 8000 * @see #onHoverChanged 8001 */ 8002 public boolean onHoverEvent(MotionEvent event) { 8003 // The root view may receive hover (or touch) events that are outside the bounds of 8004 // the window. This code ensures that we only send accessibility events for 8005 // hovers that are actually within the bounds of the root view. 8006 final int action = event.getActionMasked(); 8007 if (!mSendingHoverAccessibilityEvents) { 8008 if ((action == MotionEvent.ACTION_HOVER_ENTER 8009 || action == MotionEvent.ACTION_HOVER_MOVE) 8010 && !hasHoveredChild() 8011 && pointInView(event.getX(), event.getY())) { 8012 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8013 mSendingHoverAccessibilityEvents = true; 8014 } 8015 } else { 8016 if (action == MotionEvent.ACTION_HOVER_EXIT 8017 || (action == MotionEvent.ACTION_MOVE 8018 && !pointInView(event.getX(), event.getY()))) { 8019 mSendingHoverAccessibilityEvents = false; 8020 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8021 // If the window does not have input focus we take away accessibility 8022 // focus as soon as the user stop hovering over the view. 8023 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8024 getViewRootImpl().setAccessibilityFocus(null, null); 8025 } 8026 } 8027 } 8028 8029 if (isHoverable()) { 8030 switch (action) { 8031 case MotionEvent.ACTION_HOVER_ENTER: 8032 setHovered(true); 8033 break; 8034 case MotionEvent.ACTION_HOVER_EXIT: 8035 setHovered(false); 8036 break; 8037 } 8038 8039 // Dispatch the event to onGenericMotionEvent before returning true. 8040 // This is to provide compatibility with existing applications that 8041 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8042 // break because of the new default handling for hoverable views 8043 // in onHoverEvent. 8044 // Note that onGenericMotionEvent will be called by default when 8045 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8046 dispatchGenericMotionEventInternal(event); 8047 return true; 8048 } 8049 8050 return false; 8051 } 8052 8053 /** 8054 * Returns true if the view should handle {@link #onHoverEvent} 8055 * by calling {@link #setHovered} to change its hovered state. 8056 * 8057 * @return True if the view is hoverable. 8058 */ 8059 private boolean isHoverable() { 8060 final int viewFlags = mViewFlags; 8061 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8062 return false; 8063 } 8064 8065 return (viewFlags & CLICKABLE) == CLICKABLE 8066 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8067 } 8068 8069 /** 8070 * Returns true if the view is currently hovered. 8071 * 8072 * @return True if the view is currently hovered. 8073 * 8074 * @see #setHovered 8075 * @see #onHoverChanged 8076 */ 8077 @ViewDebug.ExportedProperty 8078 public boolean isHovered() { 8079 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8080 } 8081 8082 /** 8083 * Sets whether the view is currently hovered. 8084 * <p> 8085 * Calling this method also changes the drawable state of the view. This 8086 * enables the view to react to hover by using different drawable resources 8087 * to change its appearance. 8088 * </p><p> 8089 * The {@link #onHoverChanged} method is called when the hovered state changes. 8090 * </p> 8091 * 8092 * @param hovered True if the view is hovered. 8093 * 8094 * @see #isHovered 8095 * @see #onHoverChanged 8096 */ 8097 public void setHovered(boolean hovered) { 8098 if (hovered) { 8099 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8100 mPrivateFlags |= PFLAG_HOVERED; 8101 refreshDrawableState(); 8102 onHoverChanged(true); 8103 } 8104 } else { 8105 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8106 mPrivateFlags &= ~PFLAG_HOVERED; 8107 refreshDrawableState(); 8108 onHoverChanged(false); 8109 } 8110 } 8111 } 8112 8113 /** 8114 * Implement this method to handle hover state changes. 8115 * <p> 8116 * This method is called whenever the hover state changes as a result of a 8117 * call to {@link #setHovered}. 8118 * </p> 8119 * 8120 * @param hovered The current hover state, as returned by {@link #isHovered}. 8121 * 8122 * @see #isHovered 8123 * @see #setHovered 8124 */ 8125 public void onHoverChanged(boolean hovered) { 8126 } 8127 8128 /** 8129 * Implement this method to handle touch screen motion events. 8130 * 8131 * @param event The motion event. 8132 * @return True if the event was handled, false otherwise. 8133 */ 8134 public boolean onTouchEvent(MotionEvent event) { 8135 final int viewFlags = mViewFlags; 8136 8137 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8138 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8139 setPressed(false); 8140 } 8141 // A disabled view that is clickable still consumes the touch 8142 // events, it just doesn't respond to them. 8143 return (((viewFlags & CLICKABLE) == CLICKABLE || 8144 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8145 } 8146 8147 if (mTouchDelegate != null) { 8148 if (mTouchDelegate.onTouchEvent(event)) { 8149 return true; 8150 } 8151 } 8152 8153 if (((viewFlags & CLICKABLE) == CLICKABLE || 8154 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8155 switch (event.getAction()) { 8156 case MotionEvent.ACTION_UP: 8157 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8158 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8159 // take focus if we don't have it already and we should in 8160 // touch mode. 8161 boolean focusTaken = false; 8162 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8163 focusTaken = requestFocus(); 8164 } 8165 8166 if (prepressed) { 8167 // The button is being released before we actually 8168 // showed it as pressed. Make it show the pressed 8169 // state now (before scheduling the click) to ensure 8170 // the user sees it. 8171 setPressed(true); 8172 } 8173 8174 if (!mHasPerformedLongPress) { 8175 // This is a tap, so remove the longpress check 8176 removeLongPressCallback(); 8177 8178 // Only perform take click actions if we were in the pressed state 8179 if (!focusTaken) { 8180 // Use a Runnable and post this rather than calling 8181 // performClick directly. This lets other visual state 8182 // of the view update before click actions start. 8183 if (mPerformClick == null) { 8184 mPerformClick = new PerformClick(); 8185 } 8186 if (!post(mPerformClick)) { 8187 performClick(); 8188 } 8189 } 8190 } 8191 8192 if (mUnsetPressedState == null) { 8193 mUnsetPressedState = new UnsetPressedState(); 8194 } 8195 8196 if (prepressed) { 8197 postDelayed(mUnsetPressedState, 8198 ViewConfiguration.getPressedStateDuration()); 8199 } else if (!post(mUnsetPressedState)) { 8200 // If the post failed, unpress right now 8201 mUnsetPressedState.run(); 8202 } 8203 removeTapCallback(); 8204 } 8205 break; 8206 8207 case MotionEvent.ACTION_DOWN: 8208 mHasPerformedLongPress = false; 8209 8210 if (performButtonActionOnTouchDown(event)) { 8211 break; 8212 } 8213 8214 // Walk up the hierarchy to determine if we're inside a scrolling container. 8215 boolean isInScrollingContainer = isInScrollingContainer(); 8216 8217 // For views inside a scrolling container, delay the pressed feedback for 8218 // a short period in case this is a scroll. 8219 if (isInScrollingContainer) { 8220 mPrivateFlags |= PFLAG_PREPRESSED; 8221 if (mPendingCheckForTap == null) { 8222 mPendingCheckForTap = new CheckForTap(); 8223 } 8224 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8225 } else { 8226 // Not inside a scrolling container, so show the feedback right away 8227 setPressed(true); 8228 checkForLongClick(0); 8229 } 8230 break; 8231 8232 case MotionEvent.ACTION_CANCEL: 8233 setPressed(false); 8234 removeTapCallback(); 8235 break; 8236 8237 case MotionEvent.ACTION_MOVE: 8238 final int x = (int) event.getX(); 8239 final int y = (int) event.getY(); 8240 8241 // Be lenient about moving outside of buttons 8242 if (!pointInView(x, y, mTouchSlop)) { 8243 // Outside button 8244 removeTapCallback(); 8245 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8246 // Remove any future long press/tap checks 8247 removeLongPressCallback(); 8248 8249 setPressed(false); 8250 } 8251 } 8252 break; 8253 } 8254 return true; 8255 } 8256 8257 return false; 8258 } 8259 8260 /** 8261 * @hide 8262 */ 8263 public boolean isInScrollingContainer() { 8264 ViewParent p = getParent(); 8265 while (p != null && p instanceof ViewGroup) { 8266 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8267 return true; 8268 } 8269 p = p.getParent(); 8270 } 8271 return false; 8272 } 8273 8274 /** 8275 * Remove the longpress detection timer. 8276 */ 8277 private void removeLongPressCallback() { 8278 if (mPendingCheckForLongPress != null) { 8279 removeCallbacks(mPendingCheckForLongPress); 8280 } 8281 } 8282 8283 /** 8284 * Remove the pending click action 8285 */ 8286 private void removePerformClickCallback() { 8287 if (mPerformClick != null) { 8288 removeCallbacks(mPerformClick); 8289 } 8290 } 8291 8292 /** 8293 * Remove the prepress detection timer. 8294 */ 8295 private void removeUnsetPressCallback() { 8296 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8297 setPressed(false); 8298 removeCallbacks(mUnsetPressedState); 8299 } 8300 } 8301 8302 /** 8303 * Remove the tap detection timer. 8304 */ 8305 private void removeTapCallback() { 8306 if (mPendingCheckForTap != null) { 8307 mPrivateFlags &= ~PFLAG_PREPRESSED; 8308 removeCallbacks(mPendingCheckForTap); 8309 } 8310 } 8311 8312 /** 8313 * Cancels a pending long press. Your subclass can use this if you 8314 * want the context menu to come up if the user presses and holds 8315 * at the same place, but you don't want it to come up if they press 8316 * and then move around enough to cause scrolling. 8317 */ 8318 public void cancelLongPress() { 8319 removeLongPressCallback(); 8320 8321 /* 8322 * The prepressed state handled by the tap callback is a display 8323 * construct, but the tap callback will post a long press callback 8324 * less its own timeout. Remove it here. 8325 */ 8326 removeTapCallback(); 8327 } 8328 8329 /** 8330 * Remove the pending callback for sending a 8331 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8332 */ 8333 private void removeSendViewScrolledAccessibilityEventCallback() { 8334 if (mSendViewScrolledAccessibilityEvent != null) { 8335 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8336 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8337 } 8338 } 8339 8340 /** 8341 * Sets the TouchDelegate for this View. 8342 */ 8343 public void setTouchDelegate(TouchDelegate delegate) { 8344 mTouchDelegate = delegate; 8345 } 8346 8347 /** 8348 * Gets the TouchDelegate for this View. 8349 */ 8350 public TouchDelegate getTouchDelegate() { 8351 return mTouchDelegate; 8352 } 8353 8354 /** 8355 * Set flags controlling behavior of this view. 8356 * 8357 * @param flags Constant indicating the value which should be set 8358 * @param mask Constant indicating the bit range that should be changed 8359 */ 8360 void setFlags(int flags, int mask) { 8361 int old = mViewFlags; 8362 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8363 8364 int changed = mViewFlags ^ old; 8365 if (changed == 0) { 8366 return; 8367 } 8368 int privateFlags = mPrivateFlags; 8369 8370 /* Check if the FOCUSABLE bit has changed */ 8371 if (((changed & FOCUSABLE_MASK) != 0) && 8372 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8373 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8374 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8375 /* Give up focus if we are no longer focusable */ 8376 clearFocus(); 8377 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8378 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8379 /* 8380 * Tell the view system that we are now available to take focus 8381 * if no one else already has it. 8382 */ 8383 if (mParent != null) mParent.focusableViewAvailable(this); 8384 } 8385 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8386 notifyAccessibilityStateChanged(); 8387 } 8388 } 8389 8390 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8391 if ((changed & VISIBILITY_MASK) != 0) { 8392 /* 8393 * If this view is becoming visible, invalidate it in case it changed while 8394 * it was not visible. Marking it drawn ensures that the invalidation will 8395 * go through. 8396 */ 8397 mPrivateFlags |= PFLAG_DRAWN; 8398 invalidate(true); 8399 8400 needGlobalAttributesUpdate(true); 8401 8402 // a view becoming visible is worth notifying the parent 8403 // about in case nothing has focus. even if this specific view 8404 // isn't focusable, it may contain something that is, so let 8405 // the root view try to give this focus if nothing else does. 8406 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8407 mParent.focusableViewAvailable(this); 8408 } 8409 } 8410 } 8411 8412 /* Check if the GONE bit has changed */ 8413 if ((changed & GONE) != 0) { 8414 needGlobalAttributesUpdate(false); 8415 requestLayout(); 8416 8417 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8418 if (hasFocus()) clearFocus(); 8419 clearAccessibilityFocus(); 8420 destroyDrawingCache(); 8421 if (mParent instanceof View) { 8422 // GONE views noop invalidation, so invalidate the parent 8423 ((View) mParent).invalidate(true); 8424 } 8425 // Mark the view drawn to ensure that it gets invalidated properly the next 8426 // time it is visible and gets invalidated 8427 mPrivateFlags |= PFLAG_DRAWN; 8428 } 8429 if (mAttachInfo != null) { 8430 mAttachInfo.mViewVisibilityChanged = true; 8431 } 8432 } 8433 8434 /* Check if the VISIBLE bit has changed */ 8435 if ((changed & INVISIBLE) != 0) { 8436 needGlobalAttributesUpdate(false); 8437 /* 8438 * If this view is becoming invisible, set the DRAWN flag so that 8439 * the next invalidate() will not be skipped. 8440 */ 8441 mPrivateFlags |= PFLAG_DRAWN; 8442 8443 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8444 // root view becoming invisible shouldn't clear focus and accessibility focus 8445 if (getRootView() != this) { 8446 clearFocus(); 8447 clearAccessibilityFocus(); 8448 } 8449 } 8450 if (mAttachInfo != null) { 8451 mAttachInfo.mViewVisibilityChanged = true; 8452 } 8453 } 8454 8455 if ((changed & VISIBILITY_MASK) != 0) { 8456 if (mParent instanceof ViewGroup) { 8457 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8458 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8459 ((View) mParent).invalidate(true); 8460 } else if (mParent != null) { 8461 mParent.invalidateChild(this, null); 8462 } 8463 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8464 } 8465 8466 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8467 destroyDrawingCache(); 8468 } 8469 8470 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8471 destroyDrawingCache(); 8472 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8473 invalidateParentCaches(); 8474 } 8475 8476 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8477 destroyDrawingCache(); 8478 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8479 } 8480 8481 if ((changed & DRAW_MASK) != 0) { 8482 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8483 if (mBackground != null) { 8484 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8485 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8486 } else { 8487 mPrivateFlags |= PFLAG_SKIP_DRAW; 8488 } 8489 } else { 8490 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8491 } 8492 requestLayout(); 8493 invalidate(true); 8494 } 8495 8496 if ((changed & KEEP_SCREEN_ON) != 0) { 8497 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8498 mParent.recomputeViewAttributes(this); 8499 } 8500 } 8501 8502 if (AccessibilityManager.getInstance(mContext).isEnabled() 8503 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8504 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8505 notifyAccessibilityStateChanged(); 8506 } 8507 } 8508 8509 /** 8510 * Change the view's z order in the tree, so it's on top of other sibling 8511 * views 8512 */ 8513 public void bringToFront() { 8514 if (mParent != null) { 8515 mParent.bringChildToFront(this); 8516 } 8517 } 8518 8519 /** 8520 * This is called in response to an internal scroll in this view (i.e., the 8521 * view scrolled its own contents). This is typically as a result of 8522 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8523 * called. 8524 * 8525 * @param l Current horizontal scroll origin. 8526 * @param t Current vertical scroll origin. 8527 * @param oldl Previous horizontal scroll origin. 8528 * @param oldt Previous vertical scroll origin. 8529 */ 8530 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8531 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8532 postSendViewScrolledAccessibilityEventCallback(); 8533 } 8534 8535 mBackgroundSizeChanged = true; 8536 8537 final AttachInfo ai = mAttachInfo; 8538 if (ai != null) { 8539 ai.mViewScrollChanged = true; 8540 } 8541 } 8542 8543 /** 8544 * Interface definition for a callback to be invoked when the layout bounds of a view 8545 * changes due to layout processing. 8546 */ 8547 public interface OnLayoutChangeListener { 8548 /** 8549 * Called when the focus state of a view has changed. 8550 * 8551 * @param v The view whose state has changed. 8552 * @param left The new value of the view's left property. 8553 * @param top The new value of the view's top property. 8554 * @param right The new value of the view's right property. 8555 * @param bottom The new value of the view's bottom property. 8556 * @param oldLeft The previous value of the view's left property. 8557 * @param oldTop The previous value of the view's top property. 8558 * @param oldRight The previous value of the view's right property. 8559 * @param oldBottom The previous value of the view's bottom property. 8560 */ 8561 void onLayoutChange(View v, int left, int top, int right, int bottom, 8562 int oldLeft, int oldTop, int oldRight, int oldBottom); 8563 } 8564 8565 /** 8566 * This is called during layout when the size of this view has changed. If 8567 * you were just added to the view hierarchy, you're called with the old 8568 * values of 0. 8569 * 8570 * @param w Current width of this view. 8571 * @param h Current height of this view. 8572 * @param oldw Old width of this view. 8573 * @param oldh Old height of this view. 8574 */ 8575 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8576 } 8577 8578 /** 8579 * Called by draw to draw the child views. This may be overridden 8580 * by derived classes to gain control just before its children are drawn 8581 * (but after its own view has been drawn). 8582 * @param canvas the canvas on which to draw the view 8583 */ 8584 protected void dispatchDraw(Canvas canvas) { 8585 8586 } 8587 8588 /** 8589 * Gets the parent of this view. Note that the parent is a 8590 * ViewParent and not necessarily a View. 8591 * 8592 * @return Parent of this view. 8593 */ 8594 public final ViewParent getParent() { 8595 return mParent; 8596 } 8597 8598 /** 8599 * Set the horizontal scrolled position of your view. This will cause a call to 8600 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8601 * invalidated. 8602 * @param value the x position to scroll to 8603 */ 8604 public void setScrollX(int value) { 8605 scrollTo(value, mScrollY); 8606 } 8607 8608 /** 8609 * Set the vertical scrolled position of your view. This will cause a call to 8610 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8611 * invalidated. 8612 * @param value the y position to scroll to 8613 */ 8614 public void setScrollY(int value) { 8615 scrollTo(mScrollX, value); 8616 } 8617 8618 /** 8619 * Return the scrolled left position of this view. This is the left edge of 8620 * the displayed part of your view. You do not need to draw any pixels 8621 * farther left, since those are outside of the frame of your view on 8622 * screen. 8623 * 8624 * @return The left edge of the displayed part of your view, in pixels. 8625 */ 8626 public final int getScrollX() { 8627 return mScrollX; 8628 } 8629 8630 /** 8631 * Return the scrolled top position of this view. This is the top edge of 8632 * the displayed part of your view. You do not need to draw any pixels above 8633 * it, since those are outside of the frame of your view on screen. 8634 * 8635 * @return The top edge of the displayed part of your view, in pixels. 8636 */ 8637 public final int getScrollY() { 8638 return mScrollY; 8639 } 8640 8641 /** 8642 * Return the width of the your view. 8643 * 8644 * @return The width of your view, in pixels. 8645 */ 8646 @ViewDebug.ExportedProperty(category = "layout") 8647 public final int getWidth() { 8648 return mRight - mLeft; 8649 } 8650 8651 /** 8652 * Return the height of your view. 8653 * 8654 * @return The height of your view, in pixels. 8655 */ 8656 @ViewDebug.ExportedProperty(category = "layout") 8657 public final int getHeight() { 8658 return mBottom - mTop; 8659 } 8660 8661 /** 8662 * Return the visible drawing bounds of your view. Fills in the output 8663 * rectangle with the values from getScrollX(), getScrollY(), 8664 * getWidth(), and getHeight(). These bounds do not account for any 8665 * transformation properties currently set on the view, such as 8666 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 8667 * 8668 * @param outRect The (scrolled) drawing bounds of the view. 8669 */ 8670 public void getDrawingRect(Rect outRect) { 8671 outRect.left = mScrollX; 8672 outRect.top = mScrollY; 8673 outRect.right = mScrollX + (mRight - mLeft); 8674 outRect.bottom = mScrollY + (mBottom - mTop); 8675 } 8676 8677 /** 8678 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8679 * raw width component (that is the result is masked by 8680 * {@link #MEASURED_SIZE_MASK}). 8681 * 8682 * @return The raw measured width of this view. 8683 */ 8684 public final int getMeasuredWidth() { 8685 return mMeasuredWidth & MEASURED_SIZE_MASK; 8686 } 8687 8688 /** 8689 * Return the full width measurement information for this view as computed 8690 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8691 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8692 * This should be used during measurement and layout calculations only. Use 8693 * {@link #getWidth()} to see how wide a view is after layout. 8694 * 8695 * @return The measured width of this view as a bit mask. 8696 */ 8697 public final int getMeasuredWidthAndState() { 8698 return mMeasuredWidth; 8699 } 8700 8701 /** 8702 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8703 * raw width component (that is the result is masked by 8704 * {@link #MEASURED_SIZE_MASK}). 8705 * 8706 * @return The raw measured height of this view. 8707 */ 8708 public final int getMeasuredHeight() { 8709 return mMeasuredHeight & MEASURED_SIZE_MASK; 8710 } 8711 8712 /** 8713 * Return the full height measurement information for this view as computed 8714 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8715 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8716 * This should be used during measurement and layout calculations only. Use 8717 * {@link #getHeight()} to see how wide a view is after layout. 8718 * 8719 * @return The measured width of this view as a bit mask. 8720 */ 8721 public final int getMeasuredHeightAndState() { 8722 return mMeasuredHeight; 8723 } 8724 8725 /** 8726 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8727 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8728 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8729 * and the height component is at the shifted bits 8730 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8731 */ 8732 public final int getMeasuredState() { 8733 return (mMeasuredWidth&MEASURED_STATE_MASK) 8734 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8735 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8736 } 8737 8738 /** 8739 * The transform matrix of this view, which is calculated based on the current 8740 * roation, scale, and pivot properties. 8741 * 8742 * @see #getRotation() 8743 * @see #getScaleX() 8744 * @see #getScaleY() 8745 * @see #getPivotX() 8746 * @see #getPivotY() 8747 * @return The current transform matrix for the view 8748 */ 8749 public Matrix getMatrix() { 8750 if (mTransformationInfo != null) { 8751 updateMatrix(); 8752 return mTransformationInfo.mMatrix; 8753 } 8754 return Matrix.IDENTITY_MATRIX; 8755 } 8756 8757 /** 8758 * Utility function to determine if the value is far enough away from zero to be 8759 * considered non-zero. 8760 * @param value A floating point value to check for zero-ness 8761 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8762 */ 8763 private static boolean nonzero(float value) { 8764 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8765 } 8766 8767 /** 8768 * Returns true if the transform matrix is the identity matrix. 8769 * Recomputes the matrix if necessary. 8770 * 8771 * @return True if the transform matrix is the identity matrix, false otherwise. 8772 */ 8773 final boolean hasIdentityMatrix() { 8774 if (mTransformationInfo != null) { 8775 updateMatrix(); 8776 return mTransformationInfo.mMatrixIsIdentity; 8777 } 8778 return true; 8779 } 8780 8781 void ensureTransformationInfo() { 8782 if (mTransformationInfo == null) { 8783 mTransformationInfo = new TransformationInfo(); 8784 } 8785 } 8786 8787 /** 8788 * Recomputes the transform matrix if necessary. 8789 */ 8790 private void updateMatrix() { 8791 final TransformationInfo info = mTransformationInfo; 8792 if (info == null) { 8793 return; 8794 } 8795 if (info.mMatrixDirty) { 8796 // transform-related properties have changed since the last time someone 8797 // asked for the matrix; recalculate it with the current values 8798 8799 // Figure out if we need to update the pivot point 8800 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 8801 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8802 info.mPrevWidth = mRight - mLeft; 8803 info.mPrevHeight = mBottom - mTop; 8804 info.mPivotX = info.mPrevWidth / 2f; 8805 info.mPivotY = info.mPrevHeight / 2f; 8806 } 8807 } 8808 info.mMatrix.reset(); 8809 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8810 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8811 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8812 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8813 } else { 8814 if (info.mCamera == null) { 8815 info.mCamera = new Camera(); 8816 info.matrix3D = new Matrix(); 8817 } 8818 info.mCamera.save(); 8819 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8820 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8821 info.mCamera.getMatrix(info.matrix3D); 8822 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8823 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8824 info.mPivotY + info.mTranslationY); 8825 info.mMatrix.postConcat(info.matrix3D); 8826 info.mCamera.restore(); 8827 } 8828 info.mMatrixDirty = false; 8829 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8830 info.mInverseMatrixDirty = true; 8831 } 8832 } 8833 8834 /** 8835 * Utility method to retrieve the inverse of the current mMatrix property. 8836 * We cache the matrix to avoid recalculating it when transform properties 8837 * have not changed. 8838 * 8839 * @return The inverse of the current matrix of this view. 8840 */ 8841 final Matrix getInverseMatrix() { 8842 final TransformationInfo info = mTransformationInfo; 8843 if (info != null) { 8844 updateMatrix(); 8845 if (info.mInverseMatrixDirty) { 8846 if (info.mInverseMatrix == null) { 8847 info.mInverseMatrix = new Matrix(); 8848 } 8849 info.mMatrix.invert(info.mInverseMatrix); 8850 info.mInverseMatrixDirty = false; 8851 } 8852 return info.mInverseMatrix; 8853 } 8854 return Matrix.IDENTITY_MATRIX; 8855 } 8856 8857 /** 8858 * Gets the distance along the Z axis from the camera to this view. 8859 * 8860 * @see #setCameraDistance(float) 8861 * 8862 * @return The distance along the Z axis. 8863 */ 8864 public float getCameraDistance() { 8865 ensureTransformationInfo(); 8866 final float dpi = mResources.getDisplayMetrics().densityDpi; 8867 final TransformationInfo info = mTransformationInfo; 8868 if (info.mCamera == null) { 8869 info.mCamera = new Camera(); 8870 info.matrix3D = new Matrix(); 8871 } 8872 return -(info.mCamera.getLocationZ() * dpi); 8873 } 8874 8875 /** 8876 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8877 * views are drawn) from the camera to this view. The camera's distance 8878 * affects 3D transformations, for instance rotations around the X and Y 8879 * axis. If the rotationX or rotationY properties are changed and this view is 8880 * large (more than half the size of the screen), it is recommended to always 8881 * use a camera distance that's greater than the height (X axis rotation) or 8882 * the width (Y axis rotation) of this view.</p> 8883 * 8884 * <p>The distance of the camera from the view plane can have an affect on the 8885 * perspective distortion of the view when it is rotated around the x or y axis. 8886 * For example, a large distance will result in a large viewing angle, and there 8887 * will not be much perspective distortion of the view as it rotates. A short 8888 * distance may cause much more perspective distortion upon rotation, and can 8889 * also result in some drawing artifacts if the rotated view ends up partially 8890 * behind the camera (which is why the recommendation is to use a distance at 8891 * least as far as the size of the view, if the view is to be rotated.)</p> 8892 * 8893 * <p>The distance is expressed in "depth pixels." The default distance depends 8894 * on the screen density. For instance, on a medium density display, the 8895 * default distance is 1280. On a high density display, the default distance 8896 * is 1920.</p> 8897 * 8898 * <p>If you want to specify a distance that leads to visually consistent 8899 * results across various densities, use the following formula:</p> 8900 * <pre> 8901 * float scale = context.getResources().getDisplayMetrics().density; 8902 * view.setCameraDistance(distance * scale); 8903 * </pre> 8904 * 8905 * <p>The density scale factor of a high density display is 1.5, 8906 * and 1920 = 1280 * 1.5.</p> 8907 * 8908 * @param distance The distance in "depth pixels", if negative the opposite 8909 * value is used 8910 * 8911 * @see #setRotationX(float) 8912 * @see #setRotationY(float) 8913 */ 8914 public void setCameraDistance(float distance) { 8915 invalidateViewProperty(true, false); 8916 8917 ensureTransformationInfo(); 8918 final float dpi = mResources.getDisplayMetrics().densityDpi; 8919 final TransformationInfo info = mTransformationInfo; 8920 if (info.mCamera == null) { 8921 info.mCamera = new Camera(); 8922 info.matrix3D = new Matrix(); 8923 } 8924 8925 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8926 info.mMatrixDirty = true; 8927 8928 invalidateViewProperty(false, false); 8929 if (mDisplayList != null) { 8930 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8931 } 8932 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 8933 // View was rejected last time it was drawn by its parent; this may have changed 8934 invalidateParentIfNeeded(); 8935 } 8936 } 8937 8938 /** 8939 * The degrees that the view is rotated around the pivot point. 8940 * 8941 * @see #setRotation(float) 8942 * @see #getPivotX() 8943 * @see #getPivotY() 8944 * 8945 * @return The degrees of rotation. 8946 */ 8947 @ViewDebug.ExportedProperty(category = "drawing") 8948 public float getRotation() { 8949 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8950 } 8951 8952 /** 8953 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8954 * result in clockwise rotation. 8955 * 8956 * @param rotation The degrees of rotation. 8957 * 8958 * @see #getRotation() 8959 * @see #getPivotX() 8960 * @see #getPivotY() 8961 * @see #setRotationX(float) 8962 * @see #setRotationY(float) 8963 * 8964 * @attr ref android.R.styleable#View_rotation 8965 */ 8966 public void setRotation(float rotation) { 8967 ensureTransformationInfo(); 8968 final TransformationInfo info = mTransformationInfo; 8969 if (info.mRotation != rotation) { 8970 // Double-invalidation is necessary to capture view's old and new areas 8971 invalidateViewProperty(true, false); 8972 info.mRotation = rotation; 8973 info.mMatrixDirty = true; 8974 invalidateViewProperty(false, true); 8975 if (mDisplayList != null) { 8976 mDisplayList.setRotation(rotation); 8977 } 8978 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 8979 // View was rejected last time it was drawn by its parent; this may have changed 8980 invalidateParentIfNeeded(); 8981 } 8982 } 8983 } 8984 8985 /** 8986 * The degrees that the view is rotated around the vertical axis through the pivot point. 8987 * 8988 * @see #getPivotX() 8989 * @see #getPivotY() 8990 * @see #setRotationY(float) 8991 * 8992 * @return The degrees of Y rotation. 8993 */ 8994 @ViewDebug.ExportedProperty(category = "drawing") 8995 public float getRotationY() { 8996 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8997 } 8998 8999 /** 9000 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9001 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9002 * down the y axis. 9003 * 9004 * When rotating large views, it is recommended to adjust the camera distance 9005 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9006 * 9007 * @param rotationY The degrees of Y rotation. 9008 * 9009 * @see #getRotationY() 9010 * @see #getPivotX() 9011 * @see #getPivotY() 9012 * @see #setRotation(float) 9013 * @see #setRotationX(float) 9014 * @see #setCameraDistance(float) 9015 * 9016 * @attr ref android.R.styleable#View_rotationY 9017 */ 9018 public void setRotationY(float rotationY) { 9019 ensureTransformationInfo(); 9020 final TransformationInfo info = mTransformationInfo; 9021 if (info.mRotationY != rotationY) { 9022 invalidateViewProperty(true, false); 9023 info.mRotationY = rotationY; 9024 info.mMatrixDirty = true; 9025 invalidateViewProperty(false, true); 9026 if (mDisplayList != null) { 9027 mDisplayList.setRotationY(rotationY); 9028 } 9029 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9030 // View was rejected last time it was drawn by its parent; this may have changed 9031 invalidateParentIfNeeded(); 9032 } 9033 } 9034 } 9035 9036 /** 9037 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9038 * 9039 * @see #getPivotX() 9040 * @see #getPivotY() 9041 * @see #setRotationX(float) 9042 * 9043 * @return The degrees of X rotation. 9044 */ 9045 @ViewDebug.ExportedProperty(category = "drawing") 9046 public float getRotationX() { 9047 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9048 } 9049 9050 /** 9051 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9052 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9053 * x axis. 9054 * 9055 * When rotating large views, it is recommended to adjust the camera distance 9056 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9057 * 9058 * @param rotationX The degrees of X rotation. 9059 * 9060 * @see #getRotationX() 9061 * @see #getPivotX() 9062 * @see #getPivotY() 9063 * @see #setRotation(float) 9064 * @see #setRotationY(float) 9065 * @see #setCameraDistance(float) 9066 * 9067 * @attr ref android.R.styleable#View_rotationX 9068 */ 9069 public void setRotationX(float rotationX) { 9070 ensureTransformationInfo(); 9071 final TransformationInfo info = mTransformationInfo; 9072 if (info.mRotationX != rotationX) { 9073 invalidateViewProperty(true, false); 9074 info.mRotationX = rotationX; 9075 info.mMatrixDirty = true; 9076 invalidateViewProperty(false, true); 9077 if (mDisplayList != null) { 9078 mDisplayList.setRotationX(rotationX); 9079 } 9080 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9081 // View was rejected last time it was drawn by its parent; this may have changed 9082 invalidateParentIfNeeded(); 9083 } 9084 } 9085 } 9086 9087 /** 9088 * The amount that the view is scaled in x around the pivot point, as a proportion of 9089 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9090 * 9091 * <p>By default, this is 1.0f. 9092 * 9093 * @see #getPivotX() 9094 * @see #getPivotY() 9095 * @return The scaling factor. 9096 */ 9097 @ViewDebug.ExportedProperty(category = "drawing") 9098 public float getScaleX() { 9099 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9100 } 9101 9102 /** 9103 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9104 * the view's unscaled width. A value of 1 means that no scaling is applied. 9105 * 9106 * @param scaleX The scaling factor. 9107 * @see #getPivotX() 9108 * @see #getPivotY() 9109 * 9110 * @attr ref android.R.styleable#View_scaleX 9111 */ 9112 public void setScaleX(float scaleX) { 9113 ensureTransformationInfo(); 9114 final TransformationInfo info = mTransformationInfo; 9115 if (info.mScaleX != scaleX) { 9116 invalidateViewProperty(true, false); 9117 info.mScaleX = scaleX; 9118 info.mMatrixDirty = true; 9119 invalidateViewProperty(false, true); 9120 if (mDisplayList != null) { 9121 mDisplayList.setScaleX(scaleX); 9122 } 9123 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9124 // View was rejected last time it was drawn by its parent; this may have changed 9125 invalidateParentIfNeeded(); 9126 } 9127 } 9128 } 9129 9130 /** 9131 * The amount that the view is scaled in y around the pivot point, as a proportion of 9132 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9133 * 9134 * <p>By default, this is 1.0f. 9135 * 9136 * @see #getPivotX() 9137 * @see #getPivotY() 9138 * @return The scaling factor. 9139 */ 9140 @ViewDebug.ExportedProperty(category = "drawing") 9141 public float getScaleY() { 9142 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9143 } 9144 9145 /** 9146 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9147 * the view's unscaled width. A value of 1 means that no scaling is applied. 9148 * 9149 * @param scaleY The scaling factor. 9150 * @see #getPivotX() 9151 * @see #getPivotY() 9152 * 9153 * @attr ref android.R.styleable#View_scaleY 9154 */ 9155 public void setScaleY(float scaleY) { 9156 ensureTransformationInfo(); 9157 final TransformationInfo info = mTransformationInfo; 9158 if (info.mScaleY != scaleY) { 9159 invalidateViewProperty(true, false); 9160 info.mScaleY = scaleY; 9161 info.mMatrixDirty = true; 9162 invalidateViewProperty(false, true); 9163 if (mDisplayList != null) { 9164 mDisplayList.setScaleY(scaleY); 9165 } 9166 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9167 // View was rejected last time it was drawn by its parent; this may have changed 9168 invalidateParentIfNeeded(); 9169 } 9170 } 9171 } 9172 9173 /** 9174 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9175 * and {@link #setScaleX(float) scaled}. 9176 * 9177 * @see #getRotation() 9178 * @see #getScaleX() 9179 * @see #getScaleY() 9180 * @see #getPivotY() 9181 * @return The x location of the pivot point. 9182 * 9183 * @attr ref android.R.styleable#View_transformPivotX 9184 */ 9185 @ViewDebug.ExportedProperty(category = "drawing") 9186 public float getPivotX() { 9187 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9188 } 9189 9190 /** 9191 * Sets the x location of the point around which the view is 9192 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9193 * By default, the pivot point is centered on the object. 9194 * Setting this property disables this behavior and causes the view to use only the 9195 * explicitly set pivotX and pivotY values. 9196 * 9197 * @param pivotX The x location of the pivot point. 9198 * @see #getRotation() 9199 * @see #getScaleX() 9200 * @see #getScaleY() 9201 * @see #getPivotY() 9202 * 9203 * @attr ref android.R.styleable#View_transformPivotX 9204 */ 9205 public void setPivotX(float pivotX) { 9206 ensureTransformationInfo(); 9207 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9208 final TransformationInfo info = mTransformationInfo; 9209 if (info.mPivotX != pivotX) { 9210 invalidateViewProperty(true, false); 9211 info.mPivotX = pivotX; 9212 info.mMatrixDirty = true; 9213 invalidateViewProperty(false, true); 9214 if (mDisplayList != null) { 9215 mDisplayList.setPivotX(pivotX); 9216 } 9217 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9218 // View was rejected last time it was drawn by its parent; this may have changed 9219 invalidateParentIfNeeded(); 9220 } 9221 } 9222 } 9223 9224 /** 9225 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9226 * and {@link #setScaleY(float) scaled}. 9227 * 9228 * @see #getRotation() 9229 * @see #getScaleX() 9230 * @see #getScaleY() 9231 * @see #getPivotY() 9232 * @return The y location of the pivot point. 9233 * 9234 * @attr ref android.R.styleable#View_transformPivotY 9235 */ 9236 @ViewDebug.ExportedProperty(category = "drawing") 9237 public float getPivotY() { 9238 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9239 } 9240 9241 /** 9242 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9243 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9244 * Setting this property disables this behavior and causes the view to use only the 9245 * explicitly set pivotX and pivotY values. 9246 * 9247 * @param pivotY The y location of the pivot point. 9248 * @see #getRotation() 9249 * @see #getScaleX() 9250 * @see #getScaleY() 9251 * @see #getPivotY() 9252 * 9253 * @attr ref android.R.styleable#View_transformPivotY 9254 */ 9255 public void setPivotY(float pivotY) { 9256 ensureTransformationInfo(); 9257 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9258 final TransformationInfo info = mTransformationInfo; 9259 if (info.mPivotY != pivotY) { 9260 invalidateViewProperty(true, false); 9261 info.mPivotY = pivotY; 9262 info.mMatrixDirty = true; 9263 invalidateViewProperty(false, true); 9264 if (mDisplayList != null) { 9265 mDisplayList.setPivotY(pivotY); 9266 } 9267 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9268 // View was rejected last time it was drawn by its parent; this may have changed 9269 invalidateParentIfNeeded(); 9270 } 9271 } 9272 } 9273 9274 /** 9275 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9276 * completely transparent and 1 means the view is completely opaque. 9277 * 9278 * <p>By default this is 1.0f. 9279 * @return The opacity of the view. 9280 */ 9281 @ViewDebug.ExportedProperty(category = "drawing") 9282 public float getAlpha() { 9283 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9284 } 9285 9286 /** 9287 * Returns whether this View has content which overlaps. This function, intended to be 9288 * overridden by specific View types, is an optimization when alpha is set on a view. If 9289 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 9290 * and then composited it into place, which can be expensive. If the view has no overlapping 9291 * rendering, the view can draw each primitive with the appropriate alpha value directly. 9292 * An example of overlapping rendering is a TextView with a background image, such as a 9293 * Button. An example of non-overlapping rendering is a TextView with no background, or 9294 * an ImageView with only the foreground image. The default implementation returns true; 9295 * subclasses should override if they have cases which can be optimized. 9296 * 9297 * @return true if the content in this view might overlap, false otherwise. 9298 */ 9299 public boolean hasOverlappingRendering() { 9300 return true; 9301 } 9302 9303 /** 9304 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9305 * completely transparent and 1 means the view is completely opaque.</p> 9306 * 9307 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9308 * responsible for applying the opacity itself. Otherwise, calling this method is 9309 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 9310 * setting a hardware layer.</p> 9311 * 9312 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 9313 * performance implications. It is generally best to use the alpha property sparingly and 9314 * transiently, as in the case of fading animations.</p> 9315 * 9316 * @param alpha The opacity of the view. 9317 * 9318 * @see #setLayerType(int, android.graphics.Paint) 9319 * 9320 * @attr ref android.R.styleable#View_alpha 9321 */ 9322 public void setAlpha(float alpha) { 9323 ensureTransformationInfo(); 9324 if (mTransformationInfo.mAlpha != alpha) { 9325 mTransformationInfo.mAlpha = alpha; 9326 if (onSetAlpha((int) (alpha * 255))) { 9327 mPrivateFlags |= PFLAG_ALPHA_SET; 9328 // subclass is handling alpha - don't optimize rendering cache invalidation 9329 invalidateParentCaches(); 9330 invalidate(true); 9331 } else { 9332 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9333 invalidateViewProperty(true, false); 9334 if (mDisplayList != null) { 9335 mDisplayList.setAlpha(alpha); 9336 } 9337 } 9338 } 9339 } 9340 9341 /** 9342 * Faster version of setAlpha() which performs the same steps except there are 9343 * no calls to invalidate(). The caller of this function should perform proper invalidation 9344 * on the parent and this object. The return value indicates whether the subclass handles 9345 * alpha (the return value for onSetAlpha()). 9346 * 9347 * @param alpha The new value for the alpha property 9348 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9349 * the new value for the alpha property is different from the old value 9350 */ 9351 boolean setAlphaNoInvalidation(float alpha) { 9352 ensureTransformationInfo(); 9353 if (mTransformationInfo.mAlpha != alpha) { 9354 mTransformationInfo.mAlpha = alpha; 9355 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9356 if (subclassHandlesAlpha) { 9357 mPrivateFlags |= PFLAG_ALPHA_SET; 9358 return true; 9359 } else { 9360 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9361 if (mDisplayList != null) { 9362 mDisplayList.setAlpha(alpha); 9363 } 9364 } 9365 } 9366 return false; 9367 } 9368 9369 /** 9370 * Top position of this view relative to its parent. 9371 * 9372 * @return The top of this view, in pixels. 9373 */ 9374 @ViewDebug.CapturedViewProperty 9375 public final int getTop() { 9376 return mTop; 9377 } 9378 9379 /** 9380 * Sets the top position of this view relative to its parent. This method is meant to be called 9381 * by the layout system and should not generally be called otherwise, because the property 9382 * may be changed at any time by the layout. 9383 * 9384 * @param top The top of this view, in pixels. 9385 */ 9386 public final void setTop(int top) { 9387 if (top != mTop) { 9388 updateMatrix(); 9389 final boolean matrixIsIdentity = mTransformationInfo == null 9390 || mTransformationInfo.mMatrixIsIdentity; 9391 if (matrixIsIdentity) { 9392 if (mAttachInfo != null) { 9393 int minTop; 9394 int yLoc; 9395 if (top < mTop) { 9396 minTop = top; 9397 yLoc = top - mTop; 9398 } else { 9399 minTop = mTop; 9400 yLoc = 0; 9401 } 9402 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9403 } 9404 } else { 9405 // Double-invalidation is necessary to capture view's old and new areas 9406 invalidate(true); 9407 } 9408 9409 int width = mRight - mLeft; 9410 int oldHeight = mBottom - mTop; 9411 9412 mTop = top; 9413 if (mDisplayList != null) { 9414 mDisplayList.setTop(mTop); 9415 } 9416 9417 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9418 9419 if (!matrixIsIdentity) { 9420 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9421 // A change in dimension means an auto-centered pivot point changes, too 9422 mTransformationInfo.mMatrixDirty = true; 9423 } 9424 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9425 invalidate(true); 9426 } 9427 mBackgroundSizeChanged = true; 9428 invalidateParentIfNeeded(); 9429 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9430 // View was rejected last time it was drawn by its parent; this may have changed 9431 invalidateParentIfNeeded(); 9432 } 9433 } 9434 } 9435 9436 /** 9437 * Bottom position of this view relative to its parent. 9438 * 9439 * @return The bottom of this view, in pixels. 9440 */ 9441 @ViewDebug.CapturedViewProperty 9442 public final int getBottom() { 9443 return mBottom; 9444 } 9445 9446 /** 9447 * True if this view has changed since the last time being drawn. 9448 * 9449 * @return The dirty state of this view. 9450 */ 9451 public boolean isDirty() { 9452 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 9453 } 9454 9455 /** 9456 * Sets the bottom position of this view relative to its parent. This method is meant to be 9457 * called by the layout system and should not generally be called otherwise, because the 9458 * property may be changed at any time by the layout. 9459 * 9460 * @param bottom The bottom of this view, in pixels. 9461 */ 9462 public final void setBottom(int bottom) { 9463 if (bottom != mBottom) { 9464 updateMatrix(); 9465 final boolean matrixIsIdentity = mTransformationInfo == null 9466 || mTransformationInfo.mMatrixIsIdentity; 9467 if (matrixIsIdentity) { 9468 if (mAttachInfo != null) { 9469 int maxBottom; 9470 if (bottom < mBottom) { 9471 maxBottom = mBottom; 9472 } else { 9473 maxBottom = bottom; 9474 } 9475 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9476 } 9477 } else { 9478 // Double-invalidation is necessary to capture view's old and new areas 9479 invalidate(true); 9480 } 9481 9482 int width = mRight - mLeft; 9483 int oldHeight = mBottom - mTop; 9484 9485 mBottom = bottom; 9486 if (mDisplayList != null) { 9487 mDisplayList.setBottom(mBottom); 9488 } 9489 9490 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9491 9492 if (!matrixIsIdentity) { 9493 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9494 // A change in dimension means an auto-centered pivot point changes, too 9495 mTransformationInfo.mMatrixDirty = true; 9496 } 9497 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9498 invalidate(true); 9499 } 9500 mBackgroundSizeChanged = true; 9501 invalidateParentIfNeeded(); 9502 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9503 // View was rejected last time it was drawn by its parent; this may have changed 9504 invalidateParentIfNeeded(); 9505 } 9506 } 9507 } 9508 9509 /** 9510 * Left position of this view relative to its parent. 9511 * 9512 * @return The left edge of this view, in pixels. 9513 */ 9514 @ViewDebug.CapturedViewProperty 9515 public final int getLeft() { 9516 return mLeft; 9517 } 9518 9519 /** 9520 * Sets the left position of this view relative to its parent. This method is meant to be called 9521 * by the layout system and should not generally be called otherwise, because the property 9522 * may be changed at any time by the layout. 9523 * 9524 * @param left The bottom of this view, in pixels. 9525 */ 9526 public final void setLeft(int left) { 9527 if (left != mLeft) { 9528 updateMatrix(); 9529 final boolean matrixIsIdentity = mTransformationInfo == null 9530 || mTransformationInfo.mMatrixIsIdentity; 9531 if (matrixIsIdentity) { 9532 if (mAttachInfo != null) { 9533 int minLeft; 9534 int xLoc; 9535 if (left < mLeft) { 9536 minLeft = left; 9537 xLoc = left - mLeft; 9538 } else { 9539 minLeft = mLeft; 9540 xLoc = 0; 9541 } 9542 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9543 } 9544 } else { 9545 // Double-invalidation is necessary to capture view's old and new areas 9546 invalidate(true); 9547 } 9548 9549 int oldWidth = mRight - mLeft; 9550 int height = mBottom - mTop; 9551 9552 mLeft = left; 9553 if (mDisplayList != null) { 9554 mDisplayList.setLeft(left); 9555 } 9556 9557 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9558 9559 if (!matrixIsIdentity) { 9560 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9561 // A change in dimension means an auto-centered pivot point changes, too 9562 mTransformationInfo.mMatrixDirty = true; 9563 } 9564 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9565 invalidate(true); 9566 } 9567 mBackgroundSizeChanged = true; 9568 invalidateParentIfNeeded(); 9569 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9570 // View was rejected last time it was drawn by its parent; this may have changed 9571 invalidateParentIfNeeded(); 9572 } 9573 } 9574 } 9575 9576 /** 9577 * Right position of this view relative to its parent. 9578 * 9579 * @return The right edge of this view, in pixels. 9580 */ 9581 @ViewDebug.CapturedViewProperty 9582 public final int getRight() { 9583 return mRight; 9584 } 9585 9586 /** 9587 * Sets the right position of this view relative to its parent. This method is meant to be called 9588 * by the layout system and should not generally be called otherwise, because the property 9589 * may be changed at any time by the layout. 9590 * 9591 * @param right The bottom of this view, in pixels. 9592 */ 9593 public final void setRight(int right) { 9594 if (right != mRight) { 9595 updateMatrix(); 9596 final boolean matrixIsIdentity = mTransformationInfo == null 9597 || mTransformationInfo.mMatrixIsIdentity; 9598 if (matrixIsIdentity) { 9599 if (mAttachInfo != null) { 9600 int maxRight; 9601 if (right < mRight) { 9602 maxRight = mRight; 9603 } else { 9604 maxRight = right; 9605 } 9606 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9607 } 9608 } else { 9609 // Double-invalidation is necessary to capture view's old and new areas 9610 invalidate(true); 9611 } 9612 9613 int oldWidth = mRight - mLeft; 9614 int height = mBottom - mTop; 9615 9616 mRight = right; 9617 if (mDisplayList != null) { 9618 mDisplayList.setRight(mRight); 9619 } 9620 9621 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9622 9623 if (!matrixIsIdentity) { 9624 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9625 // A change in dimension means an auto-centered pivot point changes, too 9626 mTransformationInfo.mMatrixDirty = true; 9627 } 9628 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9629 invalidate(true); 9630 } 9631 mBackgroundSizeChanged = true; 9632 invalidateParentIfNeeded(); 9633 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9634 // View was rejected last time it was drawn by its parent; this may have changed 9635 invalidateParentIfNeeded(); 9636 } 9637 } 9638 } 9639 9640 /** 9641 * The visual x position of this view, in pixels. This is equivalent to the 9642 * {@link #setTranslationX(float) translationX} property plus the current 9643 * {@link #getLeft() left} property. 9644 * 9645 * @return The visual x position of this view, in pixels. 9646 */ 9647 @ViewDebug.ExportedProperty(category = "drawing") 9648 public float getX() { 9649 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9650 } 9651 9652 /** 9653 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9654 * {@link #setTranslationX(float) translationX} property to be the difference between 9655 * the x value passed in and the current {@link #getLeft() left} property. 9656 * 9657 * @param x The visual x position of this view, in pixels. 9658 */ 9659 public void setX(float x) { 9660 setTranslationX(x - mLeft); 9661 } 9662 9663 /** 9664 * The visual y position of this view, in pixels. This is equivalent to the 9665 * {@link #setTranslationY(float) translationY} property plus the current 9666 * {@link #getTop() top} property. 9667 * 9668 * @return The visual y position of this view, in pixels. 9669 */ 9670 @ViewDebug.ExportedProperty(category = "drawing") 9671 public float getY() { 9672 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9673 } 9674 9675 /** 9676 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9677 * {@link #setTranslationY(float) translationY} property to be the difference between 9678 * the y value passed in and the current {@link #getTop() top} property. 9679 * 9680 * @param y The visual y position of this view, in pixels. 9681 */ 9682 public void setY(float y) { 9683 setTranslationY(y - mTop); 9684 } 9685 9686 9687 /** 9688 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9689 * This position is post-layout, in addition to wherever the object's 9690 * layout placed it. 9691 * 9692 * @return The horizontal position of this view relative to its left position, in pixels. 9693 */ 9694 @ViewDebug.ExportedProperty(category = "drawing") 9695 public float getTranslationX() { 9696 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9697 } 9698 9699 /** 9700 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9701 * This effectively positions the object post-layout, in addition to wherever the object's 9702 * layout placed it. 9703 * 9704 * @param translationX The horizontal position of this view relative to its left position, 9705 * in pixels. 9706 * 9707 * @attr ref android.R.styleable#View_translationX 9708 */ 9709 public void setTranslationX(float translationX) { 9710 ensureTransformationInfo(); 9711 final TransformationInfo info = mTransformationInfo; 9712 if (info.mTranslationX != translationX) { 9713 // Double-invalidation is necessary to capture view's old and new areas 9714 invalidateViewProperty(true, false); 9715 info.mTranslationX = translationX; 9716 info.mMatrixDirty = true; 9717 invalidateViewProperty(false, true); 9718 if (mDisplayList != null) { 9719 mDisplayList.setTranslationX(translationX); 9720 } 9721 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9722 // View was rejected last time it was drawn by its parent; this may have changed 9723 invalidateParentIfNeeded(); 9724 } 9725 } 9726 } 9727 9728 /** 9729 * The horizontal location of this view relative to its {@link #getTop() top} position. 9730 * This position is post-layout, in addition to wherever the object's 9731 * layout placed it. 9732 * 9733 * @return The vertical position of this view relative to its top position, 9734 * in pixels. 9735 */ 9736 @ViewDebug.ExportedProperty(category = "drawing") 9737 public float getTranslationY() { 9738 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9739 } 9740 9741 /** 9742 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9743 * This effectively positions the object post-layout, in addition to wherever the object's 9744 * layout placed it. 9745 * 9746 * @param translationY The vertical position of this view relative to its top position, 9747 * in pixels. 9748 * 9749 * @attr ref android.R.styleable#View_translationY 9750 */ 9751 public void setTranslationY(float translationY) { 9752 ensureTransformationInfo(); 9753 final TransformationInfo info = mTransformationInfo; 9754 if (info.mTranslationY != translationY) { 9755 invalidateViewProperty(true, false); 9756 info.mTranslationY = translationY; 9757 info.mMatrixDirty = true; 9758 invalidateViewProperty(false, true); 9759 if (mDisplayList != null) { 9760 mDisplayList.setTranslationY(translationY); 9761 } 9762 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9763 // View was rejected last time it was drawn by its parent; this may have changed 9764 invalidateParentIfNeeded(); 9765 } 9766 } 9767 } 9768 9769 /** 9770 * Hit rectangle in parent's coordinates 9771 * 9772 * @param outRect The hit rectangle of the view. 9773 */ 9774 public void getHitRect(Rect outRect) { 9775 updateMatrix(); 9776 final TransformationInfo info = mTransformationInfo; 9777 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9778 outRect.set(mLeft, mTop, mRight, mBottom); 9779 } else { 9780 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9781 tmpRect.set(-info.mPivotX, -info.mPivotY, 9782 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9783 info.mMatrix.mapRect(tmpRect); 9784 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9785 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9786 } 9787 } 9788 9789 /** 9790 * Determines whether the given point, in local coordinates is inside the view. 9791 */ 9792 /*package*/ final boolean pointInView(float localX, float localY) { 9793 return localX >= 0 && localX < (mRight - mLeft) 9794 && localY >= 0 && localY < (mBottom - mTop); 9795 } 9796 9797 /** 9798 * Utility method to determine whether the given point, in local coordinates, 9799 * is inside the view, where the area of the view is expanded by the slop factor. 9800 * This method is called while processing touch-move events to determine if the event 9801 * is still within the view. 9802 */ 9803 private boolean pointInView(float localX, float localY, float slop) { 9804 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9805 localY < ((mBottom - mTop) + slop); 9806 } 9807 9808 /** 9809 * When a view has focus and the user navigates away from it, the next view is searched for 9810 * starting from the rectangle filled in by this method. 9811 * 9812 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 9813 * of the view. However, if your view maintains some idea of internal selection, 9814 * such as a cursor, or a selected row or column, you should override this method and 9815 * fill in a more specific rectangle. 9816 * 9817 * @param r The rectangle to fill in, in this view's coordinates. 9818 */ 9819 public void getFocusedRect(Rect r) { 9820 getDrawingRect(r); 9821 } 9822 9823 /** 9824 * If some part of this view is not clipped by any of its parents, then 9825 * return that area in r in global (root) coordinates. To convert r to local 9826 * coordinates (without taking possible View rotations into account), offset 9827 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9828 * If the view is completely clipped or translated out, return false. 9829 * 9830 * @param r If true is returned, r holds the global coordinates of the 9831 * visible portion of this view. 9832 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9833 * between this view and its root. globalOffet may be null. 9834 * @return true if r is non-empty (i.e. part of the view is visible at the 9835 * root level. 9836 */ 9837 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9838 int width = mRight - mLeft; 9839 int height = mBottom - mTop; 9840 if (width > 0 && height > 0) { 9841 r.set(0, 0, width, height); 9842 if (globalOffset != null) { 9843 globalOffset.set(-mScrollX, -mScrollY); 9844 } 9845 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9846 } 9847 return false; 9848 } 9849 9850 public final boolean getGlobalVisibleRect(Rect r) { 9851 return getGlobalVisibleRect(r, null); 9852 } 9853 9854 public final boolean getLocalVisibleRect(Rect r) { 9855 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9856 if (getGlobalVisibleRect(r, offset)) { 9857 r.offset(-offset.x, -offset.y); // make r local 9858 return true; 9859 } 9860 return false; 9861 } 9862 9863 /** 9864 * Offset this view's vertical location by the specified number of pixels. 9865 * 9866 * @param offset the number of pixels to offset the view by 9867 */ 9868 public void offsetTopAndBottom(int offset) { 9869 if (offset != 0) { 9870 updateMatrix(); 9871 final boolean matrixIsIdentity = mTransformationInfo == null 9872 || mTransformationInfo.mMatrixIsIdentity; 9873 if (matrixIsIdentity) { 9874 if (mDisplayList != null) { 9875 invalidateViewProperty(false, false); 9876 } else { 9877 final ViewParent p = mParent; 9878 if (p != null && mAttachInfo != null) { 9879 final Rect r = mAttachInfo.mTmpInvalRect; 9880 int minTop; 9881 int maxBottom; 9882 int yLoc; 9883 if (offset < 0) { 9884 minTop = mTop + offset; 9885 maxBottom = mBottom; 9886 yLoc = offset; 9887 } else { 9888 minTop = mTop; 9889 maxBottom = mBottom + offset; 9890 yLoc = 0; 9891 } 9892 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9893 p.invalidateChild(this, r); 9894 } 9895 } 9896 } else { 9897 invalidateViewProperty(false, false); 9898 } 9899 9900 mTop += offset; 9901 mBottom += offset; 9902 if (mDisplayList != null) { 9903 mDisplayList.offsetTopBottom(offset); 9904 invalidateViewProperty(false, false); 9905 } else { 9906 if (!matrixIsIdentity) { 9907 invalidateViewProperty(false, true); 9908 } 9909 invalidateParentIfNeeded(); 9910 } 9911 } 9912 } 9913 9914 /** 9915 * Offset this view's horizontal location by the specified amount of pixels. 9916 * 9917 * @param offset the numer of pixels to offset the view by 9918 */ 9919 public void offsetLeftAndRight(int offset) { 9920 if (offset != 0) { 9921 updateMatrix(); 9922 final boolean matrixIsIdentity = mTransformationInfo == null 9923 || mTransformationInfo.mMatrixIsIdentity; 9924 if (matrixIsIdentity) { 9925 if (mDisplayList != null) { 9926 invalidateViewProperty(false, false); 9927 } else { 9928 final ViewParent p = mParent; 9929 if (p != null && mAttachInfo != null) { 9930 final Rect r = mAttachInfo.mTmpInvalRect; 9931 int minLeft; 9932 int maxRight; 9933 if (offset < 0) { 9934 minLeft = mLeft + offset; 9935 maxRight = mRight; 9936 } else { 9937 minLeft = mLeft; 9938 maxRight = mRight + offset; 9939 } 9940 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9941 p.invalidateChild(this, r); 9942 } 9943 } 9944 } else { 9945 invalidateViewProperty(false, false); 9946 } 9947 9948 mLeft += offset; 9949 mRight += offset; 9950 if (mDisplayList != null) { 9951 mDisplayList.offsetLeftRight(offset); 9952 invalidateViewProperty(false, false); 9953 } else { 9954 if (!matrixIsIdentity) { 9955 invalidateViewProperty(false, true); 9956 } 9957 invalidateParentIfNeeded(); 9958 } 9959 } 9960 } 9961 9962 /** 9963 * Get the LayoutParams associated with this view. All views should have 9964 * layout parameters. These supply parameters to the <i>parent</i> of this 9965 * view specifying how it should be arranged. There are many subclasses of 9966 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9967 * of ViewGroup that are responsible for arranging their children. 9968 * 9969 * This method may return null if this View is not attached to a parent 9970 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9971 * was not invoked successfully. When a View is attached to a parent 9972 * ViewGroup, this method must not return null. 9973 * 9974 * @return The LayoutParams associated with this view, or null if no 9975 * parameters have been set yet 9976 */ 9977 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9978 public ViewGroup.LayoutParams getLayoutParams() { 9979 return mLayoutParams; 9980 } 9981 9982 /** 9983 * Set the layout parameters associated with this view. These supply 9984 * parameters to the <i>parent</i> of this view specifying how it should be 9985 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9986 * correspond to the different subclasses of ViewGroup that are responsible 9987 * for arranging their children. 9988 * 9989 * @param params The layout parameters for this view, cannot be null 9990 */ 9991 public void setLayoutParams(ViewGroup.LayoutParams params) { 9992 if (params == null) { 9993 throw new NullPointerException("Layout parameters cannot be null"); 9994 } 9995 mLayoutParams = params; 9996 resolveLayoutParams(); 9997 if (mParent instanceof ViewGroup) { 9998 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9999 } 10000 requestLayout(); 10001 } 10002 10003 /** 10004 * Resolve the layout parameters depending on the resolved layout direction 10005 * 10006 * @hide 10007 */ 10008 public void resolveLayoutParams() { 10009 if (mLayoutParams != null) { 10010 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10011 } 10012 } 10013 10014 /** 10015 * Set the scrolled position of your view. This will cause a call to 10016 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10017 * invalidated. 10018 * @param x the x position to scroll to 10019 * @param y the y position to scroll to 10020 */ 10021 public void scrollTo(int x, int y) { 10022 if (mScrollX != x || mScrollY != y) { 10023 int oldX = mScrollX; 10024 int oldY = mScrollY; 10025 mScrollX = x; 10026 mScrollY = y; 10027 invalidateParentCaches(); 10028 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10029 if (!awakenScrollBars()) { 10030 postInvalidateOnAnimation(); 10031 } 10032 } 10033 } 10034 10035 /** 10036 * Move the scrolled position of your view. This will cause a call to 10037 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10038 * invalidated. 10039 * @param x the amount of pixels to scroll by horizontally 10040 * @param y the amount of pixels to scroll by vertically 10041 */ 10042 public void scrollBy(int x, int y) { 10043 scrollTo(mScrollX + x, mScrollY + y); 10044 } 10045 10046 /** 10047 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10048 * animation to fade the scrollbars out after a default delay. If a subclass 10049 * provides animated scrolling, the start delay should equal the duration 10050 * of the scrolling animation.</p> 10051 * 10052 * <p>The animation starts only if at least one of the scrollbars is 10053 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10054 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10055 * this method returns true, and false otherwise. If the animation is 10056 * started, this method calls {@link #invalidate()}; in that case the 10057 * caller should not call {@link #invalidate()}.</p> 10058 * 10059 * <p>This method should be invoked every time a subclass directly updates 10060 * the scroll parameters.</p> 10061 * 10062 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10063 * and {@link #scrollTo(int, int)}.</p> 10064 * 10065 * @return true if the animation is played, false otherwise 10066 * 10067 * @see #awakenScrollBars(int) 10068 * @see #scrollBy(int, int) 10069 * @see #scrollTo(int, int) 10070 * @see #isHorizontalScrollBarEnabled() 10071 * @see #isVerticalScrollBarEnabled() 10072 * @see #setHorizontalScrollBarEnabled(boolean) 10073 * @see #setVerticalScrollBarEnabled(boolean) 10074 */ 10075 protected boolean awakenScrollBars() { 10076 return mScrollCache != null && 10077 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10078 } 10079 10080 /** 10081 * Trigger the scrollbars to draw. 10082 * This method differs from awakenScrollBars() only in its default duration. 10083 * initialAwakenScrollBars() will show the scroll bars for longer than 10084 * usual to give the user more of a chance to notice them. 10085 * 10086 * @return true if the animation is played, false otherwise. 10087 */ 10088 private boolean initialAwakenScrollBars() { 10089 return mScrollCache != null && 10090 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10091 } 10092 10093 /** 10094 * <p> 10095 * Trigger the scrollbars to draw. When invoked this method starts an 10096 * animation to fade the scrollbars out after a fixed delay. If a subclass 10097 * provides animated scrolling, the start delay should equal the duration of 10098 * the scrolling animation. 10099 * </p> 10100 * 10101 * <p> 10102 * The animation starts only if at least one of the scrollbars is enabled, 10103 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10104 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10105 * this method returns true, and false otherwise. If the animation is 10106 * started, this method calls {@link #invalidate()}; in that case the caller 10107 * should not call {@link #invalidate()}. 10108 * </p> 10109 * 10110 * <p> 10111 * This method should be invoked everytime a subclass directly updates the 10112 * scroll parameters. 10113 * </p> 10114 * 10115 * @param startDelay the delay, in milliseconds, after which the animation 10116 * should start; when the delay is 0, the animation starts 10117 * immediately 10118 * @return true if the animation is played, false otherwise 10119 * 10120 * @see #scrollBy(int, int) 10121 * @see #scrollTo(int, int) 10122 * @see #isHorizontalScrollBarEnabled() 10123 * @see #isVerticalScrollBarEnabled() 10124 * @see #setHorizontalScrollBarEnabled(boolean) 10125 * @see #setVerticalScrollBarEnabled(boolean) 10126 */ 10127 protected boolean awakenScrollBars(int startDelay) { 10128 return awakenScrollBars(startDelay, true); 10129 } 10130 10131 /** 10132 * <p> 10133 * Trigger the scrollbars to draw. When invoked this method starts an 10134 * animation to fade the scrollbars out after a fixed delay. If a subclass 10135 * provides animated scrolling, the start delay should equal the duration of 10136 * the scrolling animation. 10137 * </p> 10138 * 10139 * <p> 10140 * The animation starts only if at least one of the scrollbars is enabled, 10141 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10142 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10143 * this method returns true, and false otherwise. If the animation is 10144 * started, this method calls {@link #invalidate()} if the invalidate parameter 10145 * is set to true; in that case the caller 10146 * should not call {@link #invalidate()}. 10147 * </p> 10148 * 10149 * <p> 10150 * This method should be invoked everytime a subclass directly updates the 10151 * scroll parameters. 10152 * </p> 10153 * 10154 * @param startDelay the delay, in milliseconds, after which the animation 10155 * should start; when the delay is 0, the animation starts 10156 * immediately 10157 * 10158 * @param invalidate Wheter this method should call invalidate 10159 * 10160 * @return true if the animation is played, false otherwise 10161 * 10162 * @see #scrollBy(int, int) 10163 * @see #scrollTo(int, int) 10164 * @see #isHorizontalScrollBarEnabled() 10165 * @see #isVerticalScrollBarEnabled() 10166 * @see #setHorizontalScrollBarEnabled(boolean) 10167 * @see #setVerticalScrollBarEnabled(boolean) 10168 */ 10169 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10170 final ScrollabilityCache scrollCache = mScrollCache; 10171 10172 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10173 return false; 10174 } 10175 10176 if (scrollCache.scrollBar == null) { 10177 scrollCache.scrollBar = new ScrollBarDrawable(); 10178 } 10179 10180 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10181 10182 if (invalidate) { 10183 // Invalidate to show the scrollbars 10184 postInvalidateOnAnimation(); 10185 } 10186 10187 if (scrollCache.state == ScrollabilityCache.OFF) { 10188 // FIXME: this is copied from WindowManagerService. 10189 // We should get this value from the system when it 10190 // is possible to do so. 10191 final int KEY_REPEAT_FIRST_DELAY = 750; 10192 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10193 } 10194 10195 // Tell mScrollCache when we should start fading. This may 10196 // extend the fade start time if one was already scheduled 10197 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10198 scrollCache.fadeStartTime = fadeStartTime; 10199 scrollCache.state = ScrollabilityCache.ON; 10200 10201 // Schedule our fader to run, unscheduling any old ones first 10202 if (mAttachInfo != null) { 10203 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10204 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10205 } 10206 10207 return true; 10208 } 10209 10210 return false; 10211 } 10212 10213 /** 10214 * Do not invalidate views which are not visible and which are not running an animation. They 10215 * will not get drawn and they should not set dirty flags as if they will be drawn 10216 */ 10217 private boolean skipInvalidate() { 10218 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10219 (!(mParent instanceof ViewGroup) || 10220 !((ViewGroup) mParent).isViewTransitioning(this)); 10221 } 10222 /** 10223 * Mark the area defined by dirty as needing to be drawn. If the view is 10224 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10225 * in the future. This must be called from a UI thread. To call from a non-UI 10226 * thread, call {@link #postInvalidate()}. 10227 * 10228 * WARNING: This method is destructive to dirty. 10229 * @param dirty the rectangle representing the bounds of the dirty region 10230 */ 10231 public void invalidate(Rect dirty) { 10232 if (skipInvalidate()) { 10233 return; 10234 } 10235 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10236 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10237 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10238 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10239 mPrivateFlags |= PFLAG_INVALIDATED; 10240 mPrivateFlags |= PFLAG_DIRTY; 10241 final ViewParent p = mParent; 10242 final AttachInfo ai = mAttachInfo; 10243 //noinspection PointlessBooleanExpression,ConstantConditions 10244 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10245 if (p != null && ai != null && ai.mHardwareAccelerated) { 10246 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10247 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10248 p.invalidateChild(this, null); 10249 return; 10250 } 10251 } 10252 if (p != null && ai != null) { 10253 final int scrollX = mScrollX; 10254 final int scrollY = mScrollY; 10255 final Rect r = ai.mTmpInvalRect; 10256 r.set(dirty.left - scrollX, dirty.top - scrollY, 10257 dirty.right - scrollX, dirty.bottom - scrollY); 10258 mParent.invalidateChild(this, r); 10259 } 10260 } 10261 } 10262 10263 /** 10264 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10265 * The coordinates of the dirty rect are relative to the view. 10266 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10267 * will be called at some point in the future. This must be called from 10268 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10269 * @param l the left position of the dirty region 10270 * @param t the top position of the dirty region 10271 * @param r the right position of the dirty region 10272 * @param b the bottom position of the dirty region 10273 */ 10274 public void invalidate(int l, int t, int r, int b) { 10275 if (skipInvalidate()) { 10276 return; 10277 } 10278 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10279 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10280 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10281 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10282 mPrivateFlags |= PFLAG_INVALIDATED; 10283 mPrivateFlags |= PFLAG_DIRTY; 10284 final ViewParent p = mParent; 10285 final AttachInfo ai = mAttachInfo; 10286 //noinspection PointlessBooleanExpression,ConstantConditions 10287 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10288 if (p != null && ai != null && ai.mHardwareAccelerated) { 10289 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10290 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10291 p.invalidateChild(this, null); 10292 return; 10293 } 10294 } 10295 if (p != null && ai != null && l < r && t < b) { 10296 final int scrollX = mScrollX; 10297 final int scrollY = mScrollY; 10298 final Rect tmpr = ai.mTmpInvalRect; 10299 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10300 p.invalidateChild(this, tmpr); 10301 } 10302 } 10303 } 10304 10305 /** 10306 * Invalidate the whole view. If the view is visible, 10307 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10308 * the future. This must be called from a UI thread. To call from a non-UI thread, 10309 * call {@link #postInvalidate()}. 10310 */ 10311 public void invalidate() { 10312 invalidate(true); 10313 } 10314 10315 /** 10316 * This is where the invalidate() work actually happens. A full invalidate() 10317 * causes the drawing cache to be invalidated, but this function can be called with 10318 * invalidateCache set to false to skip that invalidation step for cases that do not 10319 * need it (for example, a component that remains at the same dimensions with the same 10320 * content). 10321 * 10322 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10323 * well. This is usually true for a full invalidate, but may be set to false if the 10324 * View's contents or dimensions have not changed. 10325 */ 10326 void invalidate(boolean invalidateCache) { 10327 if (skipInvalidate()) { 10328 return; 10329 } 10330 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10331 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10332 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10333 mLastIsOpaque = isOpaque(); 10334 mPrivateFlags &= ~PFLAG_DRAWN; 10335 mPrivateFlags |= PFLAG_DIRTY; 10336 if (invalidateCache) { 10337 mPrivateFlags |= PFLAG_INVALIDATED; 10338 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10339 } 10340 final AttachInfo ai = mAttachInfo; 10341 final ViewParent p = mParent; 10342 //noinspection PointlessBooleanExpression,ConstantConditions 10343 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10344 if (p != null && ai != null && ai.mHardwareAccelerated) { 10345 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10346 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10347 p.invalidateChild(this, null); 10348 return; 10349 } 10350 } 10351 10352 if (p != null && ai != null) { 10353 final Rect r = ai.mTmpInvalRect; 10354 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10355 // Don't call invalidate -- we don't want to internally scroll 10356 // our own bounds 10357 p.invalidateChild(this, r); 10358 } 10359 } 10360 } 10361 10362 /** 10363 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10364 * set any flags or handle all of the cases handled by the default invalidation methods. 10365 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10366 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10367 * walk up the hierarchy, transforming the dirty rect as necessary. 10368 * 10369 * The method also handles normal invalidation logic if display list properties are not 10370 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10371 * backup approach, to handle these cases used in the various property-setting methods. 10372 * 10373 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10374 * are not being used in this view 10375 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10376 * list properties are not being used in this view 10377 */ 10378 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10379 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10380 if (invalidateParent) { 10381 invalidateParentCaches(); 10382 } 10383 if (forceRedraw) { 10384 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10385 } 10386 invalidate(false); 10387 } else { 10388 final AttachInfo ai = mAttachInfo; 10389 final ViewParent p = mParent; 10390 if (p != null && ai != null) { 10391 final Rect r = ai.mTmpInvalRect; 10392 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10393 if (mParent instanceof ViewGroup) { 10394 ((ViewGroup) mParent).invalidateChildFast(this, r); 10395 } else { 10396 mParent.invalidateChild(this, r); 10397 } 10398 } 10399 } 10400 } 10401 10402 /** 10403 * Utility method to transform a given Rect by the current matrix of this view. 10404 */ 10405 void transformRect(final Rect rect) { 10406 if (!getMatrix().isIdentity()) { 10407 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10408 boundingRect.set(rect); 10409 getMatrix().mapRect(boundingRect); 10410 rect.set((int) (boundingRect.left - 0.5f), 10411 (int) (boundingRect.top - 0.5f), 10412 (int) (boundingRect.right + 0.5f), 10413 (int) (boundingRect.bottom + 0.5f)); 10414 } 10415 } 10416 10417 /** 10418 * Used to indicate that the parent of this view should clear its caches. This functionality 10419 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10420 * which is necessary when various parent-managed properties of the view change, such as 10421 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10422 * clears the parent caches and does not causes an invalidate event. 10423 * 10424 * @hide 10425 */ 10426 protected void invalidateParentCaches() { 10427 if (mParent instanceof View) { 10428 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10429 } 10430 } 10431 10432 /** 10433 * Used to indicate that the parent of this view should be invalidated. This functionality 10434 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10435 * which is necessary when various parent-managed properties of the view change, such as 10436 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10437 * an invalidation event to the parent. 10438 * 10439 * @hide 10440 */ 10441 protected void invalidateParentIfNeeded() { 10442 if (isHardwareAccelerated() && mParent instanceof View) { 10443 ((View) mParent).invalidate(true); 10444 } 10445 } 10446 10447 /** 10448 * Indicates whether this View is opaque. An opaque View guarantees that it will 10449 * draw all the pixels overlapping its bounds using a fully opaque color. 10450 * 10451 * Subclasses of View should override this method whenever possible to indicate 10452 * whether an instance is opaque. Opaque Views are treated in a special way by 10453 * the View hierarchy, possibly allowing it to perform optimizations during 10454 * invalidate/draw passes. 10455 * 10456 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10457 */ 10458 @ViewDebug.ExportedProperty(category = "drawing") 10459 public boolean isOpaque() { 10460 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 10461 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10462 } 10463 10464 /** 10465 * @hide 10466 */ 10467 protected void computeOpaqueFlags() { 10468 // Opaque if: 10469 // - Has a background 10470 // - Background is opaque 10471 // - Doesn't have scrollbars or scrollbars are inside overlay 10472 10473 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10474 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 10475 } else { 10476 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 10477 } 10478 10479 final int flags = mViewFlags; 10480 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10481 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10482 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 10483 } else { 10484 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 10485 } 10486 } 10487 10488 /** 10489 * @hide 10490 */ 10491 protected boolean hasOpaqueScrollbars() { 10492 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 10493 } 10494 10495 /** 10496 * @return A handler associated with the thread running the View. This 10497 * handler can be used to pump events in the UI events queue. 10498 */ 10499 public Handler getHandler() { 10500 if (mAttachInfo != null) { 10501 return mAttachInfo.mHandler; 10502 } 10503 return null; 10504 } 10505 10506 /** 10507 * Gets the view root associated with the View. 10508 * @return The view root, or null if none. 10509 * @hide 10510 */ 10511 public ViewRootImpl getViewRootImpl() { 10512 if (mAttachInfo != null) { 10513 return mAttachInfo.mViewRootImpl; 10514 } 10515 return null; 10516 } 10517 10518 /** 10519 * <p>Causes the Runnable to be added to the message queue. 10520 * The runnable will be run on the user interface thread.</p> 10521 * 10522 * @param action The Runnable that will be executed. 10523 * 10524 * @return Returns true if the Runnable was successfully placed in to the 10525 * message queue. Returns false on failure, usually because the 10526 * looper processing the message queue is exiting. 10527 * 10528 * @see #postDelayed 10529 * @see #removeCallbacks 10530 */ 10531 public boolean post(Runnable action) { 10532 final AttachInfo attachInfo = mAttachInfo; 10533 if (attachInfo != null) { 10534 return attachInfo.mHandler.post(action); 10535 } 10536 // Assume that post will succeed later 10537 ViewRootImpl.getRunQueue().post(action); 10538 return true; 10539 } 10540 10541 /** 10542 * <p>Causes the Runnable to be added to the message queue, to be run 10543 * after the specified amount of time elapses. 10544 * The runnable will be run on the user interface thread.</p> 10545 * 10546 * @param action The Runnable that will be executed. 10547 * @param delayMillis The delay (in milliseconds) until the Runnable 10548 * will be executed. 10549 * 10550 * @return true if the Runnable was successfully placed in to the 10551 * message queue. Returns false on failure, usually because the 10552 * looper processing the message queue is exiting. Note that a 10553 * result of true does not mean the Runnable will be processed -- 10554 * if the looper is quit before the delivery time of the message 10555 * occurs then the message will be dropped. 10556 * 10557 * @see #post 10558 * @see #removeCallbacks 10559 */ 10560 public boolean postDelayed(Runnable action, long delayMillis) { 10561 final AttachInfo attachInfo = mAttachInfo; 10562 if (attachInfo != null) { 10563 return attachInfo.mHandler.postDelayed(action, delayMillis); 10564 } 10565 // Assume that post will succeed later 10566 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10567 return true; 10568 } 10569 10570 /** 10571 * <p>Causes the Runnable to execute on the next animation time step. 10572 * The runnable will be run on the user interface thread.</p> 10573 * 10574 * @param action The Runnable that will be executed. 10575 * 10576 * @see #postOnAnimationDelayed 10577 * @see #removeCallbacks 10578 */ 10579 public void postOnAnimation(Runnable action) { 10580 final AttachInfo attachInfo = mAttachInfo; 10581 if (attachInfo != null) { 10582 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10583 Choreographer.CALLBACK_ANIMATION, action, null); 10584 } else { 10585 // Assume that post will succeed later 10586 ViewRootImpl.getRunQueue().post(action); 10587 } 10588 } 10589 10590 /** 10591 * <p>Causes the Runnable to execute on the next animation time step, 10592 * after the specified amount of time elapses. 10593 * The runnable will be run on the user interface thread.</p> 10594 * 10595 * @param action The Runnable that will be executed. 10596 * @param delayMillis The delay (in milliseconds) until the Runnable 10597 * will be executed. 10598 * 10599 * @see #postOnAnimation 10600 * @see #removeCallbacks 10601 */ 10602 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10603 final AttachInfo attachInfo = mAttachInfo; 10604 if (attachInfo != null) { 10605 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10606 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10607 } else { 10608 // Assume that post will succeed later 10609 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10610 } 10611 } 10612 10613 /** 10614 * <p>Removes the specified Runnable from the message queue.</p> 10615 * 10616 * @param action The Runnable to remove from the message handling queue 10617 * 10618 * @return true if this view could ask the Handler to remove the Runnable, 10619 * false otherwise. When the returned value is true, the Runnable 10620 * may or may not have been actually removed from the message queue 10621 * (for instance, if the Runnable was not in the queue already.) 10622 * 10623 * @see #post 10624 * @see #postDelayed 10625 * @see #postOnAnimation 10626 * @see #postOnAnimationDelayed 10627 */ 10628 public boolean removeCallbacks(Runnable action) { 10629 if (action != null) { 10630 final AttachInfo attachInfo = mAttachInfo; 10631 if (attachInfo != null) { 10632 attachInfo.mHandler.removeCallbacks(action); 10633 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10634 Choreographer.CALLBACK_ANIMATION, action, null); 10635 } else { 10636 // Assume that post will succeed later 10637 ViewRootImpl.getRunQueue().removeCallbacks(action); 10638 } 10639 } 10640 return true; 10641 } 10642 10643 /** 10644 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10645 * Use this to invalidate the View from a non-UI thread.</p> 10646 * 10647 * <p>This method can be invoked from outside of the UI thread 10648 * only when this View is attached to a window.</p> 10649 * 10650 * @see #invalidate() 10651 * @see #postInvalidateDelayed(long) 10652 */ 10653 public void postInvalidate() { 10654 postInvalidateDelayed(0); 10655 } 10656 10657 /** 10658 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10659 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10660 * 10661 * <p>This method can be invoked from outside of the UI thread 10662 * only when this View is attached to a window.</p> 10663 * 10664 * @param left The left coordinate of the rectangle to invalidate. 10665 * @param top The top coordinate of the rectangle to invalidate. 10666 * @param right The right coordinate of the rectangle to invalidate. 10667 * @param bottom The bottom coordinate of the rectangle to invalidate. 10668 * 10669 * @see #invalidate(int, int, int, int) 10670 * @see #invalidate(Rect) 10671 * @see #postInvalidateDelayed(long, int, int, int, int) 10672 */ 10673 public void postInvalidate(int left, int top, int right, int bottom) { 10674 postInvalidateDelayed(0, left, top, right, bottom); 10675 } 10676 10677 /** 10678 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10679 * loop. Waits for the specified amount of time.</p> 10680 * 10681 * <p>This method can be invoked from outside of the UI thread 10682 * only when this View is attached to a window.</p> 10683 * 10684 * @param delayMilliseconds the duration in milliseconds to delay the 10685 * invalidation by 10686 * 10687 * @see #invalidate() 10688 * @see #postInvalidate() 10689 */ 10690 public void postInvalidateDelayed(long delayMilliseconds) { 10691 // We try only with the AttachInfo because there's no point in invalidating 10692 // if we are not attached to our window 10693 final AttachInfo attachInfo = mAttachInfo; 10694 if (attachInfo != null) { 10695 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10696 } 10697 } 10698 10699 /** 10700 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10701 * through the event loop. Waits for the specified amount of time.</p> 10702 * 10703 * <p>This method can be invoked from outside of the UI thread 10704 * only when this View is attached to a window.</p> 10705 * 10706 * @param delayMilliseconds the duration in milliseconds to delay the 10707 * invalidation by 10708 * @param left The left coordinate of the rectangle to invalidate. 10709 * @param top The top coordinate of the rectangle to invalidate. 10710 * @param right The right coordinate of the rectangle to invalidate. 10711 * @param bottom The bottom coordinate of the rectangle to invalidate. 10712 * 10713 * @see #invalidate(int, int, int, int) 10714 * @see #invalidate(Rect) 10715 * @see #postInvalidate(int, int, int, int) 10716 */ 10717 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10718 int right, int bottom) { 10719 10720 // We try only with the AttachInfo because there's no point in invalidating 10721 // if we are not attached to our window 10722 final AttachInfo attachInfo = mAttachInfo; 10723 if (attachInfo != null) { 10724 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10725 info.target = this; 10726 info.left = left; 10727 info.top = top; 10728 info.right = right; 10729 info.bottom = bottom; 10730 10731 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10732 } 10733 } 10734 10735 /** 10736 * <p>Cause an invalidate to happen on the next animation time step, typically the 10737 * next display frame.</p> 10738 * 10739 * <p>This method can be invoked from outside of the UI thread 10740 * only when this View is attached to a window.</p> 10741 * 10742 * @see #invalidate() 10743 */ 10744 public void postInvalidateOnAnimation() { 10745 // We try only with the AttachInfo because there's no point in invalidating 10746 // if we are not attached to our window 10747 final AttachInfo attachInfo = mAttachInfo; 10748 if (attachInfo != null) { 10749 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10750 } 10751 } 10752 10753 /** 10754 * <p>Cause an invalidate of the specified area to happen on the next animation 10755 * time step, typically the next display frame.</p> 10756 * 10757 * <p>This method can be invoked from outside of the UI thread 10758 * only when this View is attached to a window.</p> 10759 * 10760 * @param left The left coordinate of the rectangle to invalidate. 10761 * @param top The top coordinate of the rectangle to invalidate. 10762 * @param right The right coordinate of the rectangle to invalidate. 10763 * @param bottom The bottom coordinate of the rectangle to invalidate. 10764 * 10765 * @see #invalidate(int, int, int, int) 10766 * @see #invalidate(Rect) 10767 */ 10768 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10769 // We try only with the AttachInfo because there's no point in invalidating 10770 // if we are not attached to our window 10771 final AttachInfo attachInfo = mAttachInfo; 10772 if (attachInfo != null) { 10773 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10774 info.target = this; 10775 info.left = left; 10776 info.top = top; 10777 info.right = right; 10778 info.bottom = bottom; 10779 10780 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10781 } 10782 } 10783 10784 /** 10785 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10786 * This event is sent at most once every 10787 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10788 */ 10789 private void postSendViewScrolledAccessibilityEventCallback() { 10790 if (mSendViewScrolledAccessibilityEvent == null) { 10791 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10792 } 10793 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10794 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10795 postDelayed(mSendViewScrolledAccessibilityEvent, 10796 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10797 } 10798 } 10799 10800 /** 10801 * Called by a parent to request that a child update its values for mScrollX 10802 * and mScrollY if necessary. This will typically be done if the child is 10803 * animating a scroll using a {@link android.widget.Scroller Scroller} 10804 * object. 10805 */ 10806 public void computeScroll() { 10807 } 10808 10809 /** 10810 * <p>Indicate whether the horizontal edges are faded when the view is 10811 * scrolled horizontally.</p> 10812 * 10813 * @return true if the horizontal edges should are faded on scroll, false 10814 * otherwise 10815 * 10816 * @see #setHorizontalFadingEdgeEnabled(boolean) 10817 * 10818 * @attr ref android.R.styleable#View_requiresFadingEdge 10819 */ 10820 public boolean isHorizontalFadingEdgeEnabled() { 10821 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10822 } 10823 10824 /** 10825 * <p>Define whether the horizontal edges should be faded when this view 10826 * is scrolled horizontally.</p> 10827 * 10828 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10829 * be faded when the view is scrolled 10830 * horizontally 10831 * 10832 * @see #isHorizontalFadingEdgeEnabled() 10833 * 10834 * @attr ref android.R.styleable#View_requiresFadingEdge 10835 */ 10836 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10837 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10838 if (horizontalFadingEdgeEnabled) { 10839 initScrollCache(); 10840 } 10841 10842 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10843 } 10844 } 10845 10846 /** 10847 * <p>Indicate whether the vertical edges are faded when the view is 10848 * scrolled horizontally.</p> 10849 * 10850 * @return true if the vertical edges should are faded on scroll, false 10851 * otherwise 10852 * 10853 * @see #setVerticalFadingEdgeEnabled(boolean) 10854 * 10855 * @attr ref android.R.styleable#View_requiresFadingEdge 10856 */ 10857 public boolean isVerticalFadingEdgeEnabled() { 10858 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10859 } 10860 10861 /** 10862 * <p>Define whether the vertical edges should be faded when this view 10863 * is scrolled vertically.</p> 10864 * 10865 * @param verticalFadingEdgeEnabled true if the vertical edges should 10866 * be faded when the view is scrolled 10867 * vertically 10868 * 10869 * @see #isVerticalFadingEdgeEnabled() 10870 * 10871 * @attr ref android.R.styleable#View_requiresFadingEdge 10872 */ 10873 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10874 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10875 if (verticalFadingEdgeEnabled) { 10876 initScrollCache(); 10877 } 10878 10879 mViewFlags ^= FADING_EDGE_VERTICAL; 10880 } 10881 } 10882 10883 /** 10884 * Returns the strength, or intensity, of the top faded edge. The strength is 10885 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10886 * returns 0.0 or 1.0 but no value in between. 10887 * 10888 * Subclasses should override this method to provide a smoother fade transition 10889 * when scrolling occurs. 10890 * 10891 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10892 */ 10893 protected float getTopFadingEdgeStrength() { 10894 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10895 } 10896 10897 /** 10898 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10899 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10900 * returns 0.0 or 1.0 but no value in between. 10901 * 10902 * Subclasses should override this method to provide a smoother fade transition 10903 * when scrolling occurs. 10904 * 10905 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10906 */ 10907 protected float getBottomFadingEdgeStrength() { 10908 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10909 computeVerticalScrollRange() ? 1.0f : 0.0f; 10910 } 10911 10912 /** 10913 * Returns the strength, or intensity, of the left faded edge. The strength is 10914 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10915 * returns 0.0 or 1.0 but no value in between. 10916 * 10917 * Subclasses should override this method to provide a smoother fade transition 10918 * when scrolling occurs. 10919 * 10920 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10921 */ 10922 protected float getLeftFadingEdgeStrength() { 10923 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10924 } 10925 10926 /** 10927 * Returns the strength, or intensity, of the right faded edge. The strength is 10928 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10929 * returns 0.0 or 1.0 but no value in between. 10930 * 10931 * Subclasses should override this method to provide a smoother fade transition 10932 * when scrolling occurs. 10933 * 10934 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10935 */ 10936 protected float getRightFadingEdgeStrength() { 10937 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10938 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10939 } 10940 10941 /** 10942 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10943 * scrollbar is not drawn by default.</p> 10944 * 10945 * @return true if the horizontal scrollbar should be painted, false 10946 * otherwise 10947 * 10948 * @see #setHorizontalScrollBarEnabled(boolean) 10949 */ 10950 public boolean isHorizontalScrollBarEnabled() { 10951 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10952 } 10953 10954 /** 10955 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10956 * scrollbar is not drawn by default.</p> 10957 * 10958 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10959 * be painted 10960 * 10961 * @see #isHorizontalScrollBarEnabled() 10962 */ 10963 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10964 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10965 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10966 computeOpaqueFlags(); 10967 resolvePadding(); 10968 } 10969 } 10970 10971 /** 10972 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10973 * scrollbar is not drawn by default.</p> 10974 * 10975 * @return true if the vertical scrollbar should be painted, false 10976 * otherwise 10977 * 10978 * @see #setVerticalScrollBarEnabled(boolean) 10979 */ 10980 public boolean isVerticalScrollBarEnabled() { 10981 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10982 } 10983 10984 /** 10985 * <p>Define whether the vertical scrollbar should be drawn or not. The 10986 * scrollbar is not drawn by default.</p> 10987 * 10988 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10989 * be painted 10990 * 10991 * @see #isVerticalScrollBarEnabled() 10992 */ 10993 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10994 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10995 mViewFlags ^= SCROLLBARS_VERTICAL; 10996 computeOpaqueFlags(); 10997 resolvePadding(); 10998 } 10999 } 11000 11001 /** 11002 * @hide 11003 */ 11004 protected void recomputePadding() { 11005 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11006 } 11007 11008 /** 11009 * Define whether scrollbars will fade when the view is not scrolling. 11010 * 11011 * @param fadeScrollbars wheter to enable fading 11012 * 11013 * @attr ref android.R.styleable#View_fadeScrollbars 11014 */ 11015 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11016 initScrollCache(); 11017 final ScrollabilityCache scrollabilityCache = mScrollCache; 11018 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11019 if (fadeScrollbars) { 11020 scrollabilityCache.state = ScrollabilityCache.OFF; 11021 } else { 11022 scrollabilityCache.state = ScrollabilityCache.ON; 11023 } 11024 } 11025 11026 /** 11027 * 11028 * Returns true if scrollbars will fade when this view is not scrolling 11029 * 11030 * @return true if scrollbar fading is enabled 11031 * 11032 * @attr ref android.R.styleable#View_fadeScrollbars 11033 */ 11034 public boolean isScrollbarFadingEnabled() { 11035 return mScrollCache != null && mScrollCache.fadeScrollBars; 11036 } 11037 11038 /** 11039 * 11040 * Returns the delay before scrollbars fade. 11041 * 11042 * @return the delay before scrollbars fade 11043 * 11044 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11045 */ 11046 public int getScrollBarDefaultDelayBeforeFade() { 11047 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11048 mScrollCache.scrollBarDefaultDelayBeforeFade; 11049 } 11050 11051 /** 11052 * Define the delay before scrollbars fade. 11053 * 11054 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11055 * 11056 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11057 */ 11058 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11059 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11060 } 11061 11062 /** 11063 * 11064 * Returns the scrollbar fade duration. 11065 * 11066 * @return the scrollbar fade duration 11067 * 11068 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11069 */ 11070 public int getScrollBarFadeDuration() { 11071 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11072 mScrollCache.scrollBarFadeDuration; 11073 } 11074 11075 /** 11076 * Define the scrollbar fade duration. 11077 * 11078 * @param scrollBarFadeDuration - the scrollbar fade duration 11079 * 11080 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11081 */ 11082 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11083 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11084 } 11085 11086 /** 11087 * 11088 * Returns the scrollbar size. 11089 * 11090 * @return the scrollbar size 11091 * 11092 * @attr ref android.R.styleable#View_scrollbarSize 11093 */ 11094 public int getScrollBarSize() { 11095 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11096 mScrollCache.scrollBarSize; 11097 } 11098 11099 /** 11100 * Define the scrollbar size. 11101 * 11102 * @param scrollBarSize - the scrollbar size 11103 * 11104 * @attr ref android.R.styleable#View_scrollbarSize 11105 */ 11106 public void setScrollBarSize(int scrollBarSize) { 11107 getScrollCache().scrollBarSize = scrollBarSize; 11108 } 11109 11110 /** 11111 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11112 * inset. When inset, they add to the padding of the view. And the scrollbars 11113 * can be drawn inside the padding area or on the edge of the view. For example, 11114 * if a view has a background drawable and you want to draw the scrollbars 11115 * inside the padding specified by the drawable, you can use 11116 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11117 * appear at the edge of the view, ignoring the padding, then you can use 11118 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11119 * @param style the style of the scrollbars. Should be one of 11120 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11121 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11122 * @see #SCROLLBARS_INSIDE_OVERLAY 11123 * @see #SCROLLBARS_INSIDE_INSET 11124 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11125 * @see #SCROLLBARS_OUTSIDE_INSET 11126 * 11127 * @attr ref android.R.styleable#View_scrollbarStyle 11128 */ 11129 public void setScrollBarStyle(int style) { 11130 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11131 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11132 computeOpaqueFlags(); 11133 resolvePadding(); 11134 } 11135 } 11136 11137 /** 11138 * <p>Returns the current scrollbar style.</p> 11139 * @return the current scrollbar style 11140 * @see #SCROLLBARS_INSIDE_OVERLAY 11141 * @see #SCROLLBARS_INSIDE_INSET 11142 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11143 * @see #SCROLLBARS_OUTSIDE_INSET 11144 * 11145 * @attr ref android.R.styleable#View_scrollbarStyle 11146 */ 11147 @ViewDebug.ExportedProperty(mapping = { 11148 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11149 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11150 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11151 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11152 }) 11153 public int getScrollBarStyle() { 11154 return mViewFlags & SCROLLBARS_STYLE_MASK; 11155 } 11156 11157 /** 11158 * <p>Compute the horizontal range that the horizontal scrollbar 11159 * represents.</p> 11160 * 11161 * <p>The range is expressed in arbitrary units that must be the same as the 11162 * units used by {@link #computeHorizontalScrollExtent()} and 11163 * {@link #computeHorizontalScrollOffset()}.</p> 11164 * 11165 * <p>The default range is the drawing width of this view.</p> 11166 * 11167 * @return the total horizontal range represented by the horizontal 11168 * scrollbar 11169 * 11170 * @see #computeHorizontalScrollExtent() 11171 * @see #computeHorizontalScrollOffset() 11172 * @see android.widget.ScrollBarDrawable 11173 */ 11174 protected int computeHorizontalScrollRange() { 11175 return getWidth(); 11176 } 11177 11178 /** 11179 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11180 * within the horizontal range. This value is used to compute the position 11181 * of the thumb within the scrollbar's track.</p> 11182 * 11183 * <p>The range is expressed in arbitrary units that must be the same as the 11184 * units used by {@link #computeHorizontalScrollRange()} and 11185 * {@link #computeHorizontalScrollExtent()}.</p> 11186 * 11187 * <p>The default offset is the scroll offset of this view.</p> 11188 * 11189 * @return the horizontal offset of the scrollbar's thumb 11190 * 11191 * @see #computeHorizontalScrollRange() 11192 * @see #computeHorizontalScrollExtent() 11193 * @see android.widget.ScrollBarDrawable 11194 */ 11195 protected int computeHorizontalScrollOffset() { 11196 return mScrollX; 11197 } 11198 11199 /** 11200 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11201 * within the horizontal range. This value is used to compute the length 11202 * of the thumb within the scrollbar's track.</p> 11203 * 11204 * <p>The range is expressed in arbitrary units that must be the same as the 11205 * units used by {@link #computeHorizontalScrollRange()} and 11206 * {@link #computeHorizontalScrollOffset()}.</p> 11207 * 11208 * <p>The default extent is the drawing width of this view.</p> 11209 * 11210 * @return the horizontal extent of the scrollbar's thumb 11211 * 11212 * @see #computeHorizontalScrollRange() 11213 * @see #computeHorizontalScrollOffset() 11214 * @see android.widget.ScrollBarDrawable 11215 */ 11216 protected int computeHorizontalScrollExtent() { 11217 return getWidth(); 11218 } 11219 11220 /** 11221 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11222 * 11223 * <p>The range is expressed in arbitrary units that must be the same as the 11224 * units used by {@link #computeVerticalScrollExtent()} and 11225 * {@link #computeVerticalScrollOffset()}.</p> 11226 * 11227 * @return the total vertical range represented by the vertical scrollbar 11228 * 11229 * <p>The default range is the drawing height of this view.</p> 11230 * 11231 * @see #computeVerticalScrollExtent() 11232 * @see #computeVerticalScrollOffset() 11233 * @see android.widget.ScrollBarDrawable 11234 */ 11235 protected int computeVerticalScrollRange() { 11236 return getHeight(); 11237 } 11238 11239 /** 11240 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11241 * within the horizontal range. This value is used to compute the position 11242 * of the thumb within the scrollbar's track.</p> 11243 * 11244 * <p>The range is expressed in arbitrary units that must be the same as the 11245 * units used by {@link #computeVerticalScrollRange()} and 11246 * {@link #computeVerticalScrollExtent()}.</p> 11247 * 11248 * <p>The default offset is the scroll offset of this view.</p> 11249 * 11250 * @return the vertical offset of the scrollbar's thumb 11251 * 11252 * @see #computeVerticalScrollRange() 11253 * @see #computeVerticalScrollExtent() 11254 * @see android.widget.ScrollBarDrawable 11255 */ 11256 protected int computeVerticalScrollOffset() { 11257 return mScrollY; 11258 } 11259 11260 /** 11261 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11262 * within the vertical range. This value is used to compute the length 11263 * of the thumb within the scrollbar's track.</p> 11264 * 11265 * <p>The range is expressed in arbitrary units that must be the same as the 11266 * units used by {@link #computeVerticalScrollRange()} and 11267 * {@link #computeVerticalScrollOffset()}.</p> 11268 * 11269 * <p>The default extent is the drawing height of this view.</p> 11270 * 11271 * @return the vertical extent of the scrollbar's thumb 11272 * 11273 * @see #computeVerticalScrollRange() 11274 * @see #computeVerticalScrollOffset() 11275 * @see android.widget.ScrollBarDrawable 11276 */ 11277 protected int computeVerticalScrollExtent() { 11278 return getHeight(); 11279 } 11280 11281 /** 11282 * Check if this view can be scrolled horizontally in a certain direction. 11283 * 11284 * @param direction Negative to check scrolling left, positive to check scrolling right. 11285 * @return true if this view can be scrolled in the specified direction, false otherwise. 11286 */ 11287 public boolean canScrollHorizontally(int direction) { 11288 final int offset = computeHorizontalScrollOffset(); 11289 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11290 if (range == 0) return false; 11291 if (direction < 0) { 11292 return offset > 0; 11293 } else { 11294 return offset < range - 1; 11295 } 11296 } 11297 11298 /** 11299 * Check if this view can be scrolled vertically in a certain direction. 11300 * 11301 * @param direction Negative to check scrolling up, positive to check scrolling down. 11302 * @return true if this view can be scrolled in the specified direction, false otherwise. 11303 */ 11304 public boolean canScrollVertically(int direction) { 11305 final int offset = computeVerticalScrollOffset(); 11306 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11307 if (range == 0) return false; 11308 if (direction < 0) { 11309 return offset > 0; 11310 } else { 11311 return offset < range - 1; 11312 } 11313 } 11314 11315 /** 11316 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11317 * scrollbars are painted only if they have been awakened first.</p> 11318 * 11319 * @param canvas the canvas on which to draw the scrollbars 11320 * 11321 * @see #awakenScrollBars(int) 11322 */ 11323 protected final void onDrawScrollBars(Canvas canvas) { 11324 // scrollbars are drawn only when the animation is running 11325 final ScrollabilityCache cache = mScrollCache; 11326 if (cache != null) { 11327 11328 int state = cache.state; 11329 11330 if (state == ScrollabilityCache.OFF) { 11331 return; 11332 } 11333 11334 boolean invalidate = false; 11335 11336 if (state == ScrollabilityCache.FADING) { 11337 // We're fading -- get our fade interpolation 11338 if (cache.interpolatorValues == null) { 11339 cache.interpolatorValues = new float[1]; 11340 } 11341 11342 float[] values = cache.interpolatorValues; 11343 11344 // Stops the animation if we're done 11345 if (cache.scrollBarInterpolator.timeToValues(values) == 11346 Interpolator.Result.FREEZE_END) { 11347 cache.state = ScrollabilityCache.OFF; 11348 } else { 11349 cache.scrollBar.setAlpha(Math.round(values[0])); 11350 } 11351 11352 // This will make the scroll bars inval themselves after 11353 // drawing. We only want this when we're fading so that 11354 // we prevent excessive redraws 11355 invalidate = true; 11356 } else { 11357 // We're just on -- but we may have been fading before so 11358 // reset alpha 11359 cache.scrollBar.setAlpha(255); 11360 } 11361 11362 11363 final int viewFlags = mViewFlags; 11364 11365 final boolean drawHorizontalScrollBar = 11366 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11367 final boolean drawVerticalScrollBar = 11368 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11369 && !isVerticalScrollBarHidden(); 11370 11371 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11372 final int width = mRight - mLeft; 11373 final int height = mBottom - mTop; 11374 11375 final ScrollBarDrawable scrollBar = cache.scrollBar; 11376 11377 final int scrollX = mScrollX; 11378 final int scrollY = mScrollY; 11379 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11380 11381 int left, top, right, bottom; 11382 11383 if (drawHorizontalScrollBar) { 11384 int size = scrollBar.getSize(false); 11385 if (size <= 0) { 11386 size = cache.scrollBarSize; 11387 } 11388 11389 scrollBar.setParameters(computeHorizontalScrollRange(), 11390 computeHorizontalScrollOffset(), 11391 computeHorizontalScrollExtent(), false); 11392 final int verticalScrollBarGap = drawVerticalScrollBar ? 11393 getVerticalScrollbarWidth() : 0; 11394 top = scrollY + height - size - (mUserPaddingBottom & inside); 11395 left = scrollX + (mPaddingLeft & inside); 11396 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11397 bottom = top + size; 11398 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11399 if (invalidate) { 11400 invalidate(left, top, right, bottom); 11401 } 11402 } 11403 11404 if (drawVerticalScrollBar) { 11405 int size = scrollBar.getSize(true); 11406 if (size <= 0) { 11407 size = cache.scrollBarSize; 11408 } 11409 11410 scrollBar.setParameters(computeVerticalScrollRange(), 11411 computeVerticalScrollOffset(), 11412 computeVerticalScrollExtent(), true); 11413 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11414 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11415 verticalScrollbarPosition = isLayoutRtl() ? 11416 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11417 } 11418 switch (verticalScrollbarPosition) { 11419 default: 11420 case SCROLLBAR_POSITION_RIGHT: 11421 left = scrollX + width - size - (mUserPaddingRight & inside); 11422 break; 11423 case SCROLLBAR_POSITION_LEFT: 11424 left = scrollX + (mUserPaddingLeft & inside); 11425 break; 11426 } 11427 top = scrollY + (mPaddingTop & inside); 11428 right = left + size; 11429 bottom = scrollY + height - (mUserPaddingBottom & inside); 11430 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11431 if (invalidate) { 11432 invalidate(left, top, right, bottom); 11433 } 11434 } 11435 } 11436 } 11437 } 11438 11439 /** 11440 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11441 * FastScroller is visible. 11442 * @return whether to temporarily hide the vertical scrollbar 11443 * @hide 11444 */ 11445 protected boolean isVerticalScrollBarHidden() { 11446 return false; 11447 } 11448 11449 /** 11450 * <p>Draw the horizontal scrollbar if 11451 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11452 * 11453 * @param canvas the canvas on which to draw the scrollbar 11454 * @param scrollBar the scrollbar's drawable 11455 * 11456 * @see #isHorizontalScrollBarEnabled() 11457 * @see #computeHorizontalScrollRange() 11458 * @see #computeHorizontalScrollExtent() 11459 * @see #computeHorizontalScrollOffset() 11460 * @see android.widget.ScrollBarDrawable 11461 * @hide 11462 */ 11463 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11464 int l, int t, int r, int b) { 11465 scrollBar.setBounds(l, t, r, b); 11466 scrollBar.draw(canvas); 11467 } 11468 11469 /** 11470 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11471 * returns true.</p> 11472 * 11473 * @param canvas the canvas on which to draw the scrollbar 11474 * @param scrollBar the scrollbar's drawable 11475 * 11476 * @see #isVerticalScrollBarEnabled() 11477 * @see #computeVerticalScrollRange() 11478 * @see #computeVerticalScrollExtent() 11479 * @see #computeVerticalScrollOffset() 11480 * @see android.widget.ScrollBarDrawable 11481 * @hide 11482 */ 11483 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11484 int l, int t, int r, int b) { 11485 scrollBar.setBounds(l, t, r, b); 11486 scrollBar.draw(canvas); 11487 } 11488 11489 /** 11490 * Implement this to do your drawing. 11491 * 11492 * @param canvas the canvas on which the background will be drawn 11493 */ 11494 protected void onDraw(Canvas canvas) { 11495 } 11496 11497 /* 11498 * Caller is responsible for calling requestLayout if necessary. 11499 * (This allows addViewInLayout to not request a new layout.) 11500 */ 11501 void assignParent(ViewParent parent) { 11502 if (mParent == null) { 11503 mParent = parent; 11504 } else if (parent == null) { 11505 mParent = null; 11506 } else { 11507 throw new RuntimeException("view " + this + " being added, but" 11508 + " it already has a parent"); 11509 } 11510 } 11511 11512 /** 11513 * This is called when the view is attached to a window. At this point it 11514 * has a Surface and will start drawing. Note that this function is 11515 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11516 * however it may be called any time before the first onDraw -- including 11517 * before or after {@link #onMeasure(int, int)}. 11518 * 11519 * @see #onDetachedFromWindow() 11520 */ 11521 protected void onAttachedToWindow() { 11522 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 11523 mParent.requestTransparentRegion(this); 11524 } 11525 11526 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11527 initialAwakenScrollBars(); 11528 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 11529 } 11530 11531 jumpDrawablesToCurrentState(); 11532 11533 clearAccessibilityFocus(); 11534 if (isFocused()) { 11535 InputMethodManager imm = InputMethodManager.peekInstance(); 11536 imm.focusIn(this); 11537 } 11538 11539 if (mAttachInfo != null && mDisplayList != null) { 11540 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11541 } 11542 } 11543 11544 /** 11545 * Resolve all RTL related properties. 11546 * 11547 * @hide 11548 */ 11549 public void resolveRtlPropertiesIfNeeded() { 11550 if (!needRtlPropertiesResolution()) return; 11551 11552 // Order is important here: LayoutDirection MUST be resolved first 11553 if (!isLayoutDirectionResolved()) { 11554 resolveLayoutDirection(); 11555 resolveLayoutParams(); 11556 } 11557 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 11558 if (!isTextDirectionResolved()) { 11559 resolveTextDirection(); 11560 } 11561 if (!isTextAlignmentResolved()) { 11562 resolveTextAlignment(); 11563 } 11564 if (!isPaddingResolved()) { 11565 resolvePadding(); 11566 } 11567 if (!isDrawablesResolved()) { 11568 resolveDrawables(); 11569 } 11570 onRtlPropertiesChanged(getLayoutDirection()); 11571 } 11572 11573 /** 11574 * Reset resolution of all RTL related properties. 11575 * 11576 * @hide 11577 */ 11578 public void resetRtlProperties() { 11579 resetResolvedLayoutDirection(); 11580 resetResolvedTextDirection(); 11581 resetResolvedTextAlignment(); 11582 resetResolvedPadding(); 11583 resetResolvedDrawables(); 11584 } 11585 11586 /** 11587 * @see #onScreenStateChanged(int) 11588 */ 11589 void dispatchScreenStateChanged(int screenState) { 11590 onScreenStateChanged(screenState); 11591 } 11592 11593 /** 11594 * This method is called whenever the state of the screen this view is 11595 * attached to changes. A state change will usually occurs when the screen 11596 * turns on or off (whether it happens automatically or the user does it 11597 * manually.) 11598 * 11599 * @param screenState The new state of the screen. Can be either 11600 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11601 */ 11602 public void onScreenStateChanged(int screenState) { 11603 } 11604 11605 /** 11606 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11607 */ 11608 private boolean hasRtlSupport() { 11609 return mContext.getApplicationInfo().hasRtlSupport(); 11610 } 11611 11612 /** 11613 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 11614 * RTL not supported) 11615 */ 11616 private boolean isRtlCompatibilityMode() { 11617 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 11618 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 11619 } 11620 11621 /** 11622 * @return true if RTL properties need resolution. 11623 */ 11624 private boolean needRtlPropertiesResolution() { 11625 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 11626 } 11627 11628 /** 11629 * Called when any RTL property (layout direction or text direction or text alignment) has 11630 * been changed. 11631 * 11632 * Subclasses need to override this method to take care of cached information that depends on the 11633 * resolved layout direction, or to inform child views that inherit their layout direction. 11634 * 11635 * The default implementation does nothing. 11636 * 11637 * @param layoutDirection the direction of the layout 11638 * 11639 * @see #LAYOUT_DIRECTION_LTR 11640 * @see #LAYOUT_DIRECTION_RTL 11641 */ 11642 public void onRtlPropertiesChanged(int layoutDirection) { 11643 } 11644 11645 /** 11646 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11647 * that the parent directionality can and will be resolved before its children. 11648 * 11649 * @return true if resolution has been done, false otherwise. 11650 * 11651 * @hide 11652 */ 11653 public boolean resolveLayoutDirection() { 11654 // Clear any previous layout direction resolution 11655 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11656 11657 if (hasRtlSupport()) { 11658 // Set resolved depending on layout direction 11659 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 11660 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 11661 case LAYOUT_DIRECTION_INHERIT: 11662 // We cannot resolve yet. LTR is by default and let the resolution happen again 11663 // later to get the correct resolved value 11664 if (!canResolveLayoutDirection()) return false; 11665 11666 View parent = ((View) mParent); 11667 // Parent has not yet resolved, LTR is still the default 11668 if (!parent.isLayoutDirectionResolved()) return false; 11669 11670 if (parent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11671 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11672 } 11673 break; 11674 case LAYOUT_DIRECTION_RTL: 11675 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11676 break; 11677 case LAYOUT_DIRECTION_LOCALE: 11678 if((LAYOUT_DIRECTION_RTL == 11679 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 11680 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11681 } 11682 break; 11683 default: 11684 // Nothing to do, LTR by default 11685 } 11686 } 11687 11688 // Set to resolved 11689 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11690 return true; 11691 } 11692 11693 /** 11694 * Check if layout direction resolution can be done. 11695 * 11696 * @return true if layout direction resolution can be done otherwise return false. 11697 * 11698 * @hide 11699 */ 11700 public boolean canResolveLayoutDirection() { 11701 switch (getRawLayoutDirection()) { 11702 case LAYOUT_DIRECTION_INHERIT: 11703 return (mParent != null) && (mParent instanceof ViewGroup) && 11704 ((ViewGroup) mParent).canResolveLayoutDirection(); 11705 default: 11706 return true; 11707 } 11708 } 11709 11710 /** 11711 * Reset the resolved layout direction. Layout direction will be resolved during a call to 11712 * {@link #onMeasure(int, int)}. 11713 * 11714 * @hide 11715 */ 11716 public void resetResolvedLayoutDirection() { 11717 // Reset the current resolved bits 11718 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11719 } 11720 11721 /** 11722 * @return true if the layout direction is inherited. 11723 * 11724 * @hide 11725 */ 11726 public boolean isLayoutDirectionInherited() { 11727 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 11728 } 11729 11730 /** 11731 * @return true if layout direction has been resolved. 11732 */ 11733 private boolean isLayoutDirectionResolved() { 11734 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11735 } 11736 11737 /** 11738 * Return if padding has been resolved 11739 * 11740 * @hide 11741 */ 11742 boolean isPaddingResolved() { 11743 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 11744 } 11745 11746 /** 11747 * Resolve padding depending on layout direction. 11748 * 11749 * @hide 11750 */ 11751 public void resolvePadding() { 11752 if (!isRtlCompatibilityMode()) { 11753 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 11754 // If start / end padding are defined, they will be resolved (hence overriding) to 11755 // left / right or right / left depending on the resolved layout direction. 11756 // If start / end padding are not defined, use the left / right ones. 11757 int resolvedLayoutDirection = getLayoutDirection(); 11758 // Set user padding to initial values ... 11759 mUserPaddingLeft = mUserPaddingLeftInitial; 11760 mUserPaddingRight = mUserPaddingRightInitial; 11761 // ... then resolve it. 11762 switch (resolvedLayoutDirection) { 11763 case LAYOUT_DIRECTION_RTL: 11764 if (mUserPaddingStart != UNDEFINED_PADDING) { 11765 mUserPaddingRight = mUserPaddingStart; 11766 } 11767 if (mUserPaddingEnd != UNDEFINED_PADDING) { 11768 mUserPaddingLeft = mUserPaddingEnd; 11769 } 11770 break; 11771 case LAYOUT_DIRECTION_LTR: 11772 default: 11773 if (mUserPaddingStart != UNDEFINED_PADDING) { 11774 mUserPaddingLeft = mUserPaddingStart; 11775 } 11776 if (mUserPaddingEnd != UNDEFINED_PADDING) { 11777 mUserPaddingRight = mUserPaddingEnd; 11778 } 11779 } 11780 11781 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11782 11783 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, 11784 mUserPaddingBottom); 11785 onRtlPropertiesChanged(resolvedLayoutDirection); 11786 } 11787 11788 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 11789 } 11790 11791 /** 11792 * Reset the resolved layout direction. 11793 * 11794 * @hide 11795 */ 11796 public void resetResolvedPadding() { 11797 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 11798 } 11799 11800 /** 11801 * This is called when the view is detached from a window. At this point it 11802 * no longer has a surface for drawing. 11803 * 11804 * @see #onAttachedToWindow() 11805 */ 11806 protected void onDetachedFromWindow() { 11807 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 11808 11809 removeUnsetPressCallback(); 11810 removeLongPressCallback(); 11811 removePerformClickCallback(); 11812 removeSendViewScrolledAccessibilityEventCallback(); 11813 11814 destroyDrawingCache(); 11815 11816 destroyLayer(false); 11817 11818 if (mAttachInfo != null) { 11819 if (mDisplayList != null) { 11820 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11821 } 11822 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11823 } else { 11824 // Should never happen 11825 clearDisplayList(); 11826 } 11827 11828 mCurrentAnimation = null; 11829 11830 resetRtlProperties(); 11831 onRtlPropertiesChanged(LAYOUT_DIRECTION_DEFAULT); 11832 resetAccessibilityStateChanged(); 11833 } 11834 11835 /** 11836 * @return The number of times this view has been attached to a window 11837 */ 11838 protected int getWindowAttachCount() { 11839 return mWindowAttachCount; 11840 } 11841 11842 /** 11843 * Retrieve a unique token identifying the window this view is attached to. 11844 * @return Return the window's token for use in 11845 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11846 */ 11847 public IBinder getWindowToken() { 11848 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11849 } 11850 11851 /** 11852 * Retrieve a unique token identifying the top-level "real" window of 11853 * the window that this view is attached to. That is, this is like 11854 * {@link #getWindowToken}, except if the window this view in is a panel 11855 * window (attached to another containing window), then the token of 11856 * the containing window is returned instead. 11857 * 11858 * @return Returns the associated window token, either 11859 * {@link #getWindowToken()} or the containing window's token. 11860 */ 11861 public IBinder getApplicationWindowToken() { 11862 AttachInfo ai = mAttachInfo; 11863 if (ai != null) { 11864 IBinder appWindowToken = ai.mPanelParentWindowToken; 11865 if (appWindowToken == null) { 11866 appWindowToken = ai.mWindowToken; 11867 } 11868 return appWindowToken; 11869 } 11870 return null; 11871 } 11872 11873 /** 11874 * Gets the logical display to which the view's window has been attached. 11875 * 11876 * @return The logical display, or null if the view is not currently attached to a window. 11877 */ 11878 public Display getDisplay() { 11879 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 11880 } 11881 11882 /** 11883 * Retrieve private session object this view hierarchy is using to 11884 * communicate with the window manager. 11885 * @return the session object to communicate with the window manager 11886 */ 11887 /*package*/ IWindowSession getWindowSession() { 11888 return mAttachInfo != null ? mAttachInfo.mSession : null; 11889 } 11890 11891 /** 11892 * @param info the {@link android.view.View.AttachInfo} to associated with 11893 * this view 11894 */ 11895 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11896 //System.out.println("Attached! " + this); 11897 mAttachInfo = info; 11898 mWindowAttachCount++; 11899 // We will need to evaluate the drawable state at least once. 11900 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 11901 if (mFloatingTreeObserver != null) { 11902 info.mTreeObserver.merge(mFloatingTreeObserver); 11903 mFloatingTreeObserver = null; 11904 } 11905 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 11906 mAttachInfo.mScrollContainers.add(this); 11907 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 11908 } 11909 performCollectViewAttributes(mAttachInfo, visibility); 11910 onAttachedToWindow(); 11911 11912 ListenerInfo li = mListenerInfo; 11913 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11914 li != null ? li.mOnAttachStateChangeListeners : null; 11915 if (listeners != null && listeners.size() > 0) { 11916 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11917 // perform the dispatching. The iterator is a safe guard against listeners that 11918 // could mutate the list by calling the various add/remove methods. This prevents 11919 // the array from being modified while we iterate it. 11920 for (OnAttachStateChangeListener listener : listeners) { 11921 listener.onViewAttachedToWindow(this); 11922 } 11923 } 11924 11925 int vis = info.mWindowVisibility; 11926 if (vis != GONE) { 11927 onWindowVisibilityChanged(vis); 11928 } 11929 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 11930 // If nobody has evaluated the drawable state yet, then do it now. 11931 refreshDrawableState(); 11932 } 11933 needGlobalAttributesUpdate(false); 11934 } 11935 11936 void dispatchDetachedFromWindow() { 11937 AttachInfo info = mAttachInfo; 11938 if (info != null) { 11939 int vis = info.mWindowVisibility; 11940 if (vis != GONE) { 11941 onWindowVisibilityChanged(GONE); 11942 } 11943 } 11944 11945 onDetachedFromWindow(); 11946 11947 ListenerInfo li = mListenerInfo; 11948 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11949 li != null ? li.mOnAttachStateChangeListeners : null; 11950 if (listeners != null && listeners.size() > 0) { 11951 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11952 // perform the dispatching. The iterator is a safe guard against listeners that 11953 // could mutate the list by calling the various add/remove methods. This prevents 11954 // the array from being modified while we iterate it. 11955 for (OnAttachStateChangeListener listener : listeners) { 11956 listener.onViewDetachedFromWindow(this); 11957 } 11958 } 11959 11960 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 11961 mAttachInfo.mScrollContainers.remove(this); 11962 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 11963 } 11964 11965 mAttachInfo = null; 11966 } 11967 11968 /** 11969 * Store this view hierarchy's frozen state into the given container. 11970 * 11971 * @param container The SparseArray in which to save the view's state. 11972 * 11973 * @see #restoreHierarchyState(android.util.SparseArray) 11974 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11975 * @see #onSaveInstanceState() 11976 */ 11977 public void saveHierarchyState(SparseArray<Parcelable> container) { 11978 dispatchSaveInstanceState(container); 11979 } 11980 11981 /** 11982 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11983 * this view and its children. May be overridden to modify how freezing happens to a 11984 * view's children; for example, some views may want to not store state for their children. 11985 * 11986 * @param container The SparseArray in which to save the view's state. 11987 * 11988 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11989 * @see #saveHierarchyState(android.util.SparseArray) 11990 * @see #onSaveInstanceState() 11991 */ 11992 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11993 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11994 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 11995 Parcelable state = onSaveInstanceState(); 11996 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 11997 throw new IllegalStateException( 11998 "Derived class did not call super.onSaveInstanceState()"); 11999 } 12000 if (state != null) { 12001 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12002 // + ": " + state); 12003 container.put(mID, state); 12004 } 12005 } 12006 } 12007 12008 /** 12009 * Hook allowing a view to generate a representation of its internal state 12010 * that can later be used to create a new instance with that same state. 12011 * This state should only contain information that is not persistent or can 12012 * not be reconstructed later. For example, you will never store your 12013 * current position on screen because that will be computed again when a 12014 * new instance of the view is placed in its view hierarchy. 12015 * <p> 12016 * Some examples of things you may store here: the current cursor position 12017 * in a text view (but usually not the text itself since that is stored in a 12018 * content provider or other persistent storage), the currently selected 12019 * item in a list view. 12020 * 12021 * @return Returns a Parcelable object containing the view's current dynamic 12022 * state, or null if there is nothing interesting to save. The 12023 * default implementation returns null. 12024 * @see #onRestoreInstanceState(android.os.Parcelable) 12025 * @see #saveHierarchyState(android.util.SparseArray) 12026 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12027 * @see #setSaveEnabled(boolean) 12028 */ 12029 protected Parcelable onSaveInstanceState() { 12030 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12031 return BaseSavedState.EMPTY_STATE; 12032 } 12033 12034 /** 12035 * Restore this view hierarchy's frozen state from the given container. 12036 * 12037 * @param container The SparseArray which holds previously frozen states. 12038 * 12039 * @see #saveHierarchyState(android.util.SparseArray) 12040 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12041 * @see #onRestoreInstanceState(android.os.Parcelable) 12042 */ 12043 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12044 dispatchRestoreInstanceState(container); 12045 } 12046 12047 /** 12048 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12049 * state for this view and its children. May be overridden to modify how restoring 12050 * happens to a view's children; for example, some views may want to not store state 12051 * for their children. 12052 * 12053 * @param container The SparseArray which holds previously saved state. 12054 * 12055 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12056 * @see #restoreHierarchyState(android.util.SparseArray) 12057 * @see #onRestoreInstanceState(android.os.Parcelable) 12058 */ 12059 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12060 if (mID != NO_ID) { 12061 Parcelable state = container.get(mID); 12062 if (state != null) { 12063 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12064 // + ": " + state); 12065 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12066 onRestoreInstanceState(state); 12067 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12068 throw new IllegalStateException( 12069 "Derived class did not call super.onRestoreInstanceState()"); 12070 } 12071 } 12072 } 12073 } 12074 12075 /** 12076 * Hook allowing a view to re-apply a representation of its internal state that had previously 12077 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12078 * null state. 12079 * 12080 * @param state The frozen state that had previously been returned by 12081 * {@link #onSaveInstanceState}. 12082 * 12083 * @see #onSaveInstanceState() 12084 * @see #restoreHierarchyState(android.util.SparseArray) 12085 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12086 */ 12087 protected void onRestoreInstanceState(Parcelable state) { 12088 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12089 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12090 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12091 + "received " + state.getClass().toString() + " instead. This usually happens " 12092 + "when two views of different type have the same id in the same hierarchy. " 12093 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12094 + "other views do not use the same id."); 12095 } 12096 } 12097 12098 /** 12099 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12100 * 12101 * @return the drawing start time in milliseconds 12102 */ 12103 public long getDrawingTime() { 12104 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12105 } 12106 12107 /** 12108 * <p>Enables or disables the duplication of the parent's state into this view. When 12109 * duplication is enabled, this view gets its drawable state from its parent rather 12110 * than from its own internal properties.</p> 12111 * 12112 * <p>Note: in the current implementation, setting this property to true after the 12113 * view was added to a ViewGroup might have no effect at all. This property should 12114 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12115 * 12116 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12117 * property is enabled, an exception will be thrown.</p> 12118 * 12119 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12120 * parent, these states should not be affected by this method.</p> 12121 * 12122 * @param enabled True to enable duplication of the parent's drawable state, false 12123 * to disable it. 12124 * 12125 * @see #getDrawableState() 12126 * @see #isDuplicateParentStateEnabled() 12127 */ 12128 public void setDuplicateParentStateEnabled(boolean enabled) { 12129 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12130 } 12131 12132 /** 12133 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12134 * 12135 * @return True if this view's drawable state is duplicated from the parent, 12136 * false otherwise 12137 * 12138 * @see #getDrawableState() 12139 * @see #setDuplicateParentStateEnabled(boolean) 12140 */ 12141 public boolean isDuplicateParentStateEnabled() { 12142 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12143 } 12144 12145 /** 12146 * <p>Specifies the type of layer backing this view. The layer can be 12147 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 12148 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 12149 * 12150 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12151 * instance that controls how the layer is composed on screen. The following 12152 * properties of the paint are taken into account when composing the layer:</p> 12153 * <ul> 12154 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12155 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12156 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12157 * </ul> 12158 * 12159 * <p>If this view has an alpha value set to < 1.0 by calling 12160 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 12161 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 12162 * equivalent to setting a hardware layer on this view and providing a paint with 12163 * the desired alpha value.</p> 12164 * 12165 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 12166 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 12167 * for more information on when and how to use layers.</p> 12168 * 12169 * @param layerType The type of layer to use with this view, must be one of 12170 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12171 * {@link #LAYER_TYPE_HARDWARE} 12172 * @param paint The paint used to compose the layer. This argument is optional 12173 * and can be null. It is ignored when the layer type is 12174 * {@link #LAYER_TYPE_NONE} 12175 * 12176 * @see #getLayerType() 12177 * @see #LAYER_TYPE_NONE 12178 * @see #LAYER_TYPE_SOFTWARE 12179 * @see #LAYER_TYPE_HARDWARE 12180 * @see #setAlpha(float) 12181 * 12182 * @attr ref android.R.styleable#View_layerType 12183 */ 12184 public void setLayerType(int layerType, Paint paint) { 12185 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12186 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12187 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12188 } 12189 12190 if (layerType == mLayerType) { 12191 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12192 mLayerPaint = paint == null ? new Paint() : paint; 12193 invalidateParentCaches(); 12194 invalidate(true); 12195 } 12196 return; 12197 } 12198 12199 // Destroy any previous software drawing cache if needed 12200 switch (mLayerType) { 12201 case LAYER_TYPE_HARDWARE: 12202 destroyLayer(false); 12203 // fall through - non-accelerated views may use software layer mechanism instead 12204 case LAYER_TYPE_SOFTWARE: 12205 destroyDrawingCache(); 12206 break; 12207 default: 12208 break; 12209 } 12210 12211 mLayerType = layerType; 12212 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12213 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12214 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12215 12216 invalidateParentCaches(); 12217 invalidate(true); 12218 } 12219 12220 /** 12221 * Updates the {@link Paint} object used with the current layer (used only if the current 12222 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12223 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12224 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12225 * ensure that the view gets redrawn immediately. 12226 * 12227 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12228 * instance that controls how the layer is composed on screen. The following 12229 * properties of the paint are taken into account when composing the layer:</p> 12230 * <ul> 12231 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12232 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12233 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12234 * </ul> 12235 * 12236 * <p>If this view has an alpha value set to < 1.0 by calling 12237 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 12238 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 12239 * equivalent to setting a hardware layer on this view and providing a paint with 12240 * the desired alpha value.</p> 12241 * 12242 * @param paint The paint used to compose the layer. This argument is optional 12243 * and can be null. It is ignored when the layer type is 12244 * {@link #LAYER_TYPE_NONE} 12245 * 12246 * @see #setLayerType(int, android.graphics.Paint) 12247 */ 12248 public void setLayerPaint(Paint paint) { 12249 int layerType = getLayerType(); 12250 if (layerType != LAYER_TYPE_NONE) { 12251 mLayerPaint = paint == null ? new Paint() : paint; 12252 if (layerType == LAYER_TYPE_HARDWARE) { 12253 HardwareLayer layer = getHardwareLayer(); 12254 if (layer != null) { 12255 layer.setLayerPaint(paint); 12256 } 12257 invalidateViewProperty(false, false); 12258 } else { 12259 invalidate(); 12260 } 12261 } 12262 } 12263 12264 /** 12265 * Indicates whether this view has a static layer. A view with layer type 12266 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12267 * dynamic. 12268 */ 12269 boolean hasStaticLayer() { 12270 return true; 12271 } 12272 12273 /** 12274 * Indicates what type of layer is currently associated with this view. By default 12275 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12276 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12277 * for more information on the different types of layers. 12278 * 12279 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12280 * {@link #LAYER_TYPE_HARDWARE} 12281 * 12282 * @see #setLayerType(int, android.graphics.Paint) 12283 * @see #buildLayer() 12284 * @see #LAYER_TYPE_NONE 12285 * @see #LAYER_TYPE_SOFTWARE 12286 * @see #LAYER_TYPE_HARDWARE 12287 */ 12288 public int getLayerType() { 12289 return mLayerType; 12290 } 12291 12292 /** 12293 * Forces this view's layer to be created and this view to be rendered 12294 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 12295 * invoking this method will have no effect. 12296 * 12297 * This method can for instance be used to render a view into its layer before 12298 * starting an animation. If this view is complex, rendering into the layer 12299 * before starting the animation will avoid skipping frames. 12300 * 12301 * @throws IllegalStateException If this view is not attached to a window 12302 * 12303 * @see #setLayerType(int, android.graphics.Paint) 12304 */ 12305 public void buildLayer() { 12306 if (mLayerType == LAYER_TYPE_NONE) return; 12307 12308 if (mAttachInfo == null) { 12309 throw new IllegalStateException("This view must be attached to a window first"); 12310 } 12311 12312 switch (mLayerType) { 12313 case LAYER_TYPE_HARDWARE: 12314 if (mAttachInfo.mHardwareRenderer != null && 12315 mAttachInfo.mHardwareRenderer.isEnabled() && 12316 mAttachInfo.mHardwareRenderer.validate()) { 12317 getHardwareLayer(); 12318 } 12319 break; 12320 case LAYER_TYPE_SOFTWARE: 12321 buildDrawingCache(true); 12322 break; 12323 } 12324 } 12325 12326 /** 12327 * <p>Returns a hardware layer that can be used to draw this view again 12328 * without executing its draw method.</p> 12329 * 12330 * @return A HardwareLayer ready to render, or null if an error occurred. 12331 */ 12332 HardwareLayer getHardwareLayer() { 12333 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 12334 !mAttachInfo.mHardwareRenderer.isEnabled()) { 12335 return null; 12336 } 12337 12338 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 12339 12340 final int width = mRight - mLeft; 12341 final int height = mBottom - mTop; 12342 12343 if (width == 0 || height == 0) { 12344 return null; 12345 } 12346 12347 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 12348 if (mHardwareLayer == null) { 12349 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 12350 width, height, isOpaque()); 12351 mLocalDirtyRect.set(0, 0, width, height); 12352 } else { 12353 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 12354 if (mHardwareLayer.resize(width, height)) { 12355 mLocalDirtyRect.set(0, 0, width, height); 12356 } 12357 } 12358 12359 // This should not be necessary but applications that change 12360 // the parameters of their background drawable without calling 12361 // this.setBackground(Drawable) can leave the view in a bad state 12362 // (for instance isOpaque() returns true, but the background is 12363 // not opaque.) 12364 computeOpaqueFlags(); 12365 12366 final boolean opaque = isOpaque(); 12367 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 12368 mHardwareLayer.setOpaque(opaque); 12369 mLocalDirtyRect.set(0, 0, width, height); 12370 } 12371 } 12372 12373 // The layer is not valid if the underlying GPU resources cannot be allocated 12374 if (!mHardwareLayer.isValid()) { 12375 return null; 12376 } 12377 12378 mHardwareLayer.setLayerPaint(mLayerPaint); 12379 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 12380 ViewRootImpl viewRoot = getViewRootImpl(); 12381 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 12382 12383 mLocalDirtyRect.setEmpty(); 12384 } 12385 12386 return mHardwareLayer; 12387 } 12388 12389 /** 12390 * Destroys this View's hardware layer if possible. 12391 * 12392 * @return True if the layer was destroyed, false otherwise. 12393 * 12394 * @see #setLayerType(int, android.graphics.Paint) 12395 * @see #LAYER_TYPE_HARDWARE 12396 */ 12397 boolean destroyLayer(boolean valid) { 12398 if (mHardwareLayer != null) { 12399 AttachInfo info = mAttachInfo; 12400 if (info != null && info.mHardwareRenderer != null && 12401 info.mHardwareRenderer.isEnabled() && 12402 (valid || info.mHardwareRenderer.validate())) { 12403 mHardwareLayer.destroy(); 12404 mHardwareLayer = null; 12405 12406 if (mDisplayList != null) { 12407 mDisplayList.reset(); 12408 } 12409 invalidate(true); 12410 invalidateParentCaches(); 12411 } 12412 return true; 12413 } 12414 return false; 12415 } 12416 12417 /** 12418 * Destroys all hardware rendering resources. This method is invoked 12419 * when the system needs to reclaim resources. Upon execution of this 12420 * method, you should free any OpenGL resources created by the view. 12421 * 12422 * Note: you <strong>must</strong> call 12423 * <code>super.destroyHardwareResources()</code> when overriding 12424 * this method. 12425 * 12426 * @hide 12427 */ 12428 protected void destroyHardwareResources() { 12429 destroyLayer(true); 12430 } 12431 12432 /** 12433 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12434 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12435 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12436 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12437 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12438 * null.</p> 12439 * 12440 * <p>Enabling the drawing cache is similar to 12441 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12442 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12443 * drawing cache has no effect on rendering because the system uses a different mechanism 12444 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12445 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12446 * for information on how to enable software and hardware layers.</p> 12447 * 12448 * <p>This API can be used to manually generate 12449 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12450 * {@link #getDrawingCache()}.</p> 12451 * 12452 * @param enabled true to enable the drawing cache, false otherwise 12453 * 12454 * @see #isDrawingCacheEnabled() 12455 * @see #getDrawingCache() 12456 * @see #buildDrawingCache() 12457 * @see #setLayerType(int, android.graphics.Paint) 12458 */ 12459 public void setDrawingCacheEnabled(boolean enabled) { 12460 mCachingFailed = false; 12461 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12462 } 12463 12464 /** 12465 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12466 * 12467 * @return true if the drawing cache is enabled 12468 * 12469 * @see #setDrawingCacheEnabled(boolean) 12470 * @see #getDrawingCache() 12471 */ 12472 @ViewDebug.ExportedProperty(category = "drawing") 12473 public boolean isDrawingCacheEnabled() { 12474 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12475 } 12476 12477 /** 12478 * Debugging utility which recursively outputs the dirty state of a view and its 12479 * descendants. 12480 * 12481 * @hide 12482 */ 12483 @SuppressWarnings({"UnusedDeclaration"}) 12484 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12485 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 12486 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 12487 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 12488 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 12489 if (clear) { 12490 mPrivateFlags &= clearMask; 12491 } 12492 if (this instanceof ViewGroup) { 12493 ViewGroup parent = (ViewGroup) this; 12494 final int count = parent.getChildCount(); 12495 for (int i = 0; i < count; i++) { 12496 final View child = parent.getChildAt(i); 12497 child.outputDirtyFlags(indent + " ", clear, clearMask); 12498 } 12499 } 12500 } 12501 12502 /** 12503 * This method is used by ViewGroup to cause its children to restore or recreate their 12504 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12505 * to recreate its own display list, which would happen if it went through the normal 12506 * draw/dispatchDraw mechanisms. 12507 * 12508 * @hide 12509 */ 12510 protected void dispatchGetDisplayList() {} 12511 12512 /** 12513 * A view that is not attached or hardware accelerated cannot create a display list. 12514 * This method checks these conditions and returns the appropriate result. 12515 * 12516 * @return true if view has the ability to create a display list, false otherwise. 12517 * 12518 * @hide 12519 */ 12520 public boolean canHaveDisplayList() { 12521 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12522 } 12523 12524 /** 12525 * @return The HardwareRenderer associated with that view or null if hardware rendering 12526 * is not supported or this this has not been attached to a window. 12527 * 12528 * @hide 12529 */ 12530 public HardwareRenderer getHardwareRenderer() { 12531 if (mAttachInfo != null) { 12532 return mAttachInfo.mHardwareRenderer; 12533 } 12534 return null; 12535 } 12536 12537 /** 12538 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12539 * Otherwise, the same display list will be returned (after having been rendered into 12540 * along the way, depending on the invalidation state of the view). 12541 * 12542 * @param displayList The previous version of this displayList, could be null. 12543 * @param isLayer Whether the requester of the display list is a layer. If so, 12544 * the view will avoid creating a layer inside the resulting display list. 12545 * @return A new or reused DisplayList object. 12546 */ 12547 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12548 if (!canHaveDisplayList()) { 12549 return null; 12550 } 12551 12552 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 12553 displayList == null || !displayList.isValid() || 12554 (!isLayer && mRecreateDisplayList))) { 12555 // Don't need to recreate the display list, just need to tell our 12556 // children to restore/recreate theirs 12557 if (displayList != null && displayList.isValid() && 12558 !isLayer && !mRecreateDisplayList) { 12559 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12560 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12561 dispatchGetDisplayList(); 12562 12563 return displayList; 12564 } 12565 12566 if (!isLayer) { 12567 // If we got here, we're recreating it. Mark it as such to ensure that 12568 // we copy in child display lists into ours in drawChild() 12569 mRecreateDisplayList = true; 12570 } 12571 if (displayList == null) { 12572 final String name = getClass().getSimpleName(); 12573 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12574 // If we're creating a new display list, make sure our parent gets invalidated 12575 // since they will need to recreate their display list to account for this 12576 // new child display list. 12577 invalidateParentCaches(); 12578 } 12579 12580 boolean caching = false; 12581 final HardwareCanvas canvas = displayList.start(); 12582 int width = mRight - mLeft; 12583 int height = mBottom - mTop; 12584 12585 try { 12586 canvas.setViewport(width, height); 12587 // The dirty rect should always be null for a display list 12588 canvas.onPreDraw(null); 12589 int layerType = getLayerType(); 12590 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12591 if (layerType == LAYER_TYPE_HARDWARE) { 12592 final HardwareLayer layer = getHardwareLayer(); 12593 if (layer != null && layer.isValid()) { 12594 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12595 } else { 12596 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12597 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12598 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12599 } 12600 caching = true; 12601 } else { 12602 buildDrawingCache(true); 12603 Bitmap cache = getDrawingCache(true); 12604 if (cache != null) { 12605 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12606 caching = true; 12607 } 12608 } 12609 } else { 12610 12611 computeScroll(); 12612 12613 canvas.translate(-mScrollX, -mScrollY); 12614 if (!isLayer) { 12615 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12616 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12617 } 12618 12619 // Fast path for layouts with no backgrounds 12620 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 12621 dispatchDraw(canvas); 12622 } else { 12623 draw(canvas); 12624 } 12625 } 12626 } finally { 12627 canvas.onPostDraw(); 12628 12629 displayList.end(); 12630 displayList.setCaching(caching); 12631 if (isLayer) { 12632 displayList.setLeftTopRightBottom(0, 0, width, height); 12633 } else { 12634 setDisplayListProperties(displayList); 12635 } 12636 } 12637 } else if (!isLayer) { 12638 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12639 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12640 } 12641 12642 return displayList; 12643 } 12644 12645 /** 12646 * Get the DisplayList for the HardwareLayer 12647 * 12648 * @param layer The HardwareLayer whose DisplayList we want 12649 * @return A DisplayList fopr the specified HardwareLayer 12650 */ 12651 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12652 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12653 layer.setDisplayList(displayList); 12654 return displayList; 12655 } 12656 12657 12658 /** 12659 * <p>Returns a display list that can be used to draw this view again 12660 * without executing its draw method.</p> 12661 * 12662 * @return A DisplayList ready to replay, or null if caching is not enabled. 12663 * 12664 * @hide 12665 */ 12666 public DisplayList getDisplayList() { 12667 mDisplayList = getDisplayList(mDisplayList, false); 12668 return mDisplayList; 12669 } 12670 12671 private void clearDisplayList() { 12672 if (mDisplayList != null) { 12673 mDisplayList.invalidate(); 12674 mDisplayList.clear(); 12675 } 12676 } 12677 12678 /** 12679 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12680 * 12681 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12682 * 12683 * @see #getDrawingCache(boolean) 12684 */ 12685 public Bitmap getDrawingCache() { 12686 return getDrawingCache(false); 12687 } 12688 12689 /** 12690 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12691 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12692 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12693 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12694 * request the drawing cache by calling this method and draw it on screen if the 12695 * returned bitmap is not null.</p> 12696 * 12697 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12698 * this method will create a bitmap of the same size as this view. Because this bitmap 12699 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12700 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12701 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12702 * size than the view. This implies that your application must be able to handle this 12703 * size.</p> 12704 * 12705 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12706 * the current density of the screen when the application is in compatibility 12707 * mode. 12708 * 12709 * @return A bitmap representing this view or null if cache is disabled. 12710 * 12711 * @see #setDrawingCacheEnabled(boolean) 12712 * @see #isDrawingCacheEnabled() 12713 * @see #buildDrawingCache(boolean) 12714 * @see #destroyDrawingCache() 12715 */ 12716 public Bitmap getDrawingCache(boolean autoScale) { 12717 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12718 return null; 12719 } 12720 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12721 buildDrawingCache(autoScale); 12722 } 12723 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12724 } 12725 12726 /** 12727 * <p>Frees the resources used by the drawing cache. If you call 12728 * {@link #buildDrawingCache()} manually without calling 12729 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12730 * should cleanup the cache with this method afterwards.</p> 12731 * 12732 * @see #setDrawingCacheEnabled(boolean) 12733 * @see #buildDrawingCache() 12734 * @see #getDrawingCache() 12735 */ 12736 public void destroyDrawingCache() { 12737 if (mDrawingCache != null) { 12738 mDrawingCache.recycle(); 12739 mDrawingCache = null; 12740 } 12741 if (mUnscaledDrawingCache != null) { 12742 mUnscaledDrawingCache.recycle(); 12743 mUnscaledDrawingCache = null; 12744 } 12745 } 12746 12747 /** 12748 * Setting a solid background color for the drawing cache's bitmaps will improve 12749 * performance and memory usage. Note, though that this should only be used if this 12750 * view will always be drawn on top of a solid color. 12751 * 12752 * @param color The background color to use for the drawing cache's bitmap 12753 * 12754 * @see #setDrawingCacheEnabled(boolean) 12755 * @see #buildDrawingCache() 12756 * @see #getDrawingCache() 12757 */ 12758 public void setDrawingCacheBackgroundColor(int color) { 12759 if (color != mDrawingCacheBackgroundColor) { 12760 mDrawingCacheBackgroundColor = color; 12761 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 12762 } 12763 } 12764 12765 /** 12766 * @see #setDrawingCacheBackgroundColor(int) 12767 * 12768 * @return The background color to used for the drawing cache's bitmap 12769 */ 12770 public int getDrawingCacheBackgroundColor() { 12771 return mDrawingCacheBackgroundColor; 12772 } 12773 12774 /** 12775 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12776 * 12777 * @see #buildDrawingCache(boolean) 12778 */ 12779 public void buildDrawingCache() { 12780 buildDrawingCache(false); 12781 } 12782 12783 /** 12784 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12785 * 12786 * <p>If you call {@link #buildDrawingCache()} manually without calling 12787 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12788 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12789 * 12790 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12791 * this method will create a bitmap of the same size as this view. Because this bitmap 12792 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12793 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12794 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12795 * size than the view. This implies that your application must be able to handle this 12796 * size.</p> 12797 * 12798 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12799 * you do not need the drawing cache bitmap, calling this method will increase memory 12800 * usage and cause the view to be rendered in software once, thus negatively impacting 12801 * performance.</p> 12802 * 12803 * @see #getDrawingCache() 12804 * @see #destroyDrawingCache() 12805 */ 12806 public void buildDrawingCache(boolean autoScale) { 12807 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 12808 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12809 mCachingFailed = false; 12810 12811 int width = mRight - mLeft; 12812 int height = mBottom - mTop; 12813 12814 final AttachInfo attachInfo = mAttachInfo; 12815 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12816 12817 if (autoScale && scalingRequired) { 12818 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12819 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12820 } 12821 12822 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12823 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12824 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12825 12826 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 12827 final long drawingCacheSize = 12828 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 12829 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 12830 if (width > 0 && height > 0) { 12831 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 12832 + projectedBitmapSize + " bytes, only " 12833 + drawingCacheSize + " available"); 12834 } 12835 destroyDrawingCache(); 12836 mCachingFailed = true; 12837 return; 12838 } 12839 12840 boolean clear = true; 12841 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12842 12843 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12844 Bitmap.Config quality; 12845 if (!opaque) { 12846 // Never pick ARGB_4444 because it looks awful 12847 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12848 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12849 case DRAWING_CACHE_QUALITY_AUTO: 12850 quality = Bitmap.Config.ARGB_8888; 12851 break; 12852 case DRAWING_CACHE_QUALITY_LOW: 12853 quality = Bitmap.Config.ARGB_8888; 12854 break; 12855 case DRAWING_CACHE_QUALITY_HIGH: 12856 quality = Bitmap.Config.ARGB_8888; 12857 break; 12858 default: 12859 quality = Bitmap.Config.ARGB_8888; 12860 break; 12861 } 12862 } else { 12863 // Optimization for translucent windows 12864 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12865 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12866 } 12867 12868 // Try to cleanup memory 12869 if (bitmap != null) bitmap.recycle(); 12870 12871 try { 12872 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 12873 width, height, quality); 12874 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12875 if (autoScale) { 12876 mDrawingCache = bitmap; 12877 } else { 12878 mUnscaledDrawingCache = bitmap; 12879 } 12880 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12881 } catch (OutOfMemoryError e) { 12882 // If there is not enough memory to create the bitmap cache, just 12883 // ignore the issue as bitmap caches are not required to draw the 12884 // view hierarchy 12885 if (autoScale) { 12886 mDrawingCache = null; 12887 } else { 12888 mUnscaledDrawingCache = null; 12889 } 12890 mCachingFailed = true; 12891 return; 12892 } 12893 12894 clear = drawingCacheBackgroundColor != 0; 12895 } 12896 12897 Canvas canvas; 12898 if (attachInfo != null) { 12899 canvas = attachInfo.mCanvas; 12900 if (canvas == null) { 12901 canvas = new Canvas(); 12902 } 12903 canvas.setBitmap(bitmap); 12904 // Temporarily clobber the cached Canvas in case one of our children 12905 // is also using a drawing cache. Without this, the children would 12906 // steal the canvas by attaching their own bitmap to it and bad, bad 12907 // thing would happen (invisible views, corrupted drawings, etc.) 12908 attachInfo.mCanvas = null; 12909 } else { 12910 // This case should hopefully never or seldom happen 12911 canvas = new Canvas(bitmap); 12912 } 12913 12914 if (clear) { 12915 bitmap.eraseColor(drawingCacheBackgroundColor); 12916 } 12917 12918 computeScroll(); 12919 final int restoreCount = canvas.save(); 12920 12921 if (autoScale && scalingRequired) { 12922 final float scale = attachInfo.mApplicationScale; 12923 canvas.scale(scale, scale); 12924 } 12925 12926 canvas.translate(-mScrollX, -mScrollY); 12927 12928 mPrivateFlags |= PFLAG_DRAWN; 12929 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12930 mLayerType != LAYER_TYPE_NONE) { 12931 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 12932 } 12933 12934 // Fast path for layouts with no backgrounds 12935 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 12936 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12937 dispatchDraw(canvas); 12938 } else { 12939 draw(canvas); 12940 } 12941 12942 canvas.restoreToCount(restoreCount); 12943 canvas.setBitmap(null); 12944 12945 if (attachInfo != null) { 12946 // Restore the cached Canvas for our siblings 12947 attachInfo.mCanvas = canvas; 12948 } 12949 } 12950 } 12951 12952 /** 12953 * Create a snapshot of the view into a bitmap. We should probably make 12954 * some form of this public, but should think about the API. 12955 */ 12956 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12957 int width = mRight - mLeft; 12958 int height = mBottom - mTop; 12959 12960 final AttachInfo attachInfo = mAttachInfo; 12961 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12962 width = (int) ((width * scale) + 0.5f); 12963 height = (int) ((height * scale) + 0.5f); 12964 12965 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 12966 width > 0 ? width : 1, height > 0 ? height : 1, quality); 12967 if (bitmap == null) { 12968 throw new OutOfMemoryError(); 12969 } 12970 12971 Resources resources = getResources(); 12972 if (resources != null) { 12973 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12974 } 12975 12976 Canvas canvas; 12977 if (attachInfo != null) { 12978 canvas = attachInfo.mCanvas; 12979 if (canvas == null) { 12980 canvas = new Canvas(); 12981 } 12982 canvas.setBitmap(bitmap); 12983 // Temporarily clobber the cached Canvas in case one of our children 12984 // is also using a drawing cache. Without this, the children would 12985 // steal the canvas by attaching their own bitmap to it and bad, bad 12986 // things would happen (invisible views, corrupted drawings, etc.) 12987 attachInfo.mCanvas = null; 12988 } else { 12989 // This case should hopefully never or seldom happen 12990 canvas = new Canvas(bitmap); 12991 } 12992 12993 if ((backgroundColor & 0xff000000) != 0) { 12994 bitmap.eraseColor(backgroundColor); 12995 } 12996 12997 computeScroll(); 12998 final int restoreCount = canvas.save(); 12999 canvas.scale(scale, scale); 13000 canvas.translate(-mScrollX, -mScrollY); 13001 13002 // Temporarily remove the dirty mask 13003 int flags = mPrivateFlags; 13004 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13005 13006 // Fast path for layouts with no backgrounds 13007 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13008 dispatchDraw(canvas); 13009 } else { 13010 draw(canvas); 13011 } 13012 13013 mPrivateFlags = flags; 13014 13015 canvas.restoreToCount(restoreCount); 13016 canvas.setBitmap(null); 13017 13018 if (attachInfo != null) { 13019 // Restore the cached Canvas for our siblings 13020 attachInfo.mCanvas = canvas; 13021 } 13022 13023 return bitmap; 13024 } 13025 13026 /** 13027 * Indicates whether this View is currently in edit mode. A View is usually 13028 * in edit mode when displayed within a developer tool. For instance, if 13029 * this View is being drawn by a visual user interface builder, this method 13030 * should return true. 13031 * 13032 * Subclasses should check the return value of this method to provide 13033 * different behaviors if their normal behavior might interfere with the 13034 * host environment. For instance: the class spawns a thread in its 13035 * constructor, the drawing code relies on device-specific features, etc. 13036 * 13037 * This method is usually checked in the drawing code of custom widgets. 13038 * 13039 * @return True if this View is in edit mode, false otherwise. 13040 */ 13041 public boolean isInEditMode() { 13042 return false; 13043 } 13044 13045 /** 13046 * If the View draws content inside its padding and enables fading edges, 13047 * it needs to support padding offsets. Padding offsets are added to the 13048 * fading edges to extend the length of the fade so that it covers pixels 13049 * drawn inside the padding. 13050 * 13051 * Subclasses of this class should override this method if they need 13052 * to draw content inside the padding. 13053 * 13054 * @return True if padding offset must be applied, false otherwise. 13055 * 13056 * @see #getLeftPaddingOffset() 13057 * @see #getRightPaddingOffset() 13058 * @see #getTopPaddingOffset() 13059 * @see #getBottomPaddingOffset() 13060 * 13061 * @since CURRENT 13062 */ 13063 protected boolean isPaddingOffsetRequired() { 13064 return false; 13065 } 13066 13067 /** 13068 * Amount by which to extend the left fading region. Called only when 13069 * {@link #isPaddingOffsetRequired()} returns true. 13070 * 13071 * @return The left padding offset in pixels. 13072 * 13073 * @see #isPaddingOffsetRequired() 13074 * 13075 * @since CURRENT 13076 */ 13077 protected int getLeftPaddingOffset() { 13078 return 0; 13079 } 13080 13081 /** 13082 * Amount by which to extend the right fading region. Called only when 13083 * {@link #isPaddingOffsetRequired()} returns true. 13084 * 13085 * @return The right padding offset in pixels. 13086 * 13087 * @see #isPaddingOffsetRequired() 13088 * 13089 * @since CURRENT 13090 */ 13091 protected int getRightPaddingOffset() { 13092 return 0; 13093 } 13094 13095 /** 13096 * Amount by which to extend the top fading region. Called only when 13097 * {@link #isPaddingOffsetRequired()} returns true. 13098 * 13099 * @return The top padding offset in pixels. 13100 * 13101 * @see #isPaddingOffsetRequired() 13102 * 13103 * @since CURRENT 13104 */ 13105 protected int getTopPaddingOffset() { 13106 return 0; 13107 } 13108 13109 /** 13110 * Amount by which to extend the bottom fading region. Called only when 13111 * {@link #isPaddingOffsetRequired()} returns true. 13112 * 13113 * @return The bottom padding offset in pixels. 13114 * 13115 * @see #isPaddingOffsetRequired() 13116 * 13117 * @since CURRENT 13118 */ 13119 protected int getBottomPaddingOffset() { 13120 return 0; 13121 } 13122 13123 /** 13124 * @hide 13125 * @param offsetRequired 13126 */ 13127 protected int getFadeTop(boolean offsetRequired) { 13128 int top = mPaddingTop; 13129 if (offsetRequired) top += getTopPaddingOffset(); 13130 return top; 13131 } 13132 13133 /** 13134 * @hide 13135 * @param offsetRequired 13136 */ 13137 protected int getFadeHeight(boolean offsetRequired) { 13138 int padding = mPaddingTop; 13139 if (offsetRequired) padding += getTopPaddingOffset(); 13140 return mBottom - mTop - mPaddingBottom - padding; 13141 } 13142 13143 /** 13144 * <p>Indicates whether this view is attached to a hardware accelerated 13145 * window or not.</p> 13146 * 13147 * <p>Even if this method returns true, it does not mean that every call 13148 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13149 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13150 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13151 * window is hardware accelerated, 13152 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13153 * return false, and this method will return true.</p> 13154 * 13155 * @return True if the view is attached to a window and the window is 13156 * hardware accelerated; false in any other case. 13157 */ 13158 public boolean isHardwareAccelerated() { 13159 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13160 } 13161 13162 /** 13163 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13164 * case of an active Animation being run on the view. 13165 */ 13166 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13167 Animation a, boolean scalingRequired) { 13168 Transformation invalidationTransform; 13169 final int flags = parent.mGroupFlags; 13170 final boolean initialized = a.isInitialized(); 13171 if (!initialized) { 13172 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13173 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13174 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13175 onAnimationStart(); 13176 } 13177 13178 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 13179 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13180 if (parent.mInvalidationTransformation == null) { 13181 parent.mInvalidationTransformation = new Transformation(); 13182 } 13183 invalidationTransform = parent.mInvalidationTransformation; 13184 a.getTransformation(drawingTime, invalidationTransform, 1f); 13185 } else { 13186 invalidationTransform = parent.mChildTransformation; 13187 } 13188 13189 if (more) { 13190 if (!a.willChangeBounds()) { 13191 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13192 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13193 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13194 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13195 // The child need to draw an animation, potentially offscreen, so 13196 // make sure we do not cancel invalidate requests 13197 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13198 parent.invalidate(mLeft, mTop, mRight, mBottom); 13199 } 13200 } else { 13201 if (parent.mInvalidateRegion == null) { 13202 parent.mInvalidateRegion = new RectF(); 13203 } 13204 final RectF region = parent.mInvalidateRegion; 13205 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13206 invalidationTransform); 13207 13208 // The child need to draw an animation, potentially offscreen, so 13209 // make sure we do not cancel invalidate requests 13210 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13211 13212 final int left = mLeft + (int) region.left; 13213 final int top = mTop + (int) region.top; 13214 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13215 top + (int) (region.height() + .5f)); 13216 } 13217 } 13218 return more; 13219 } 13220 13221 /** 13222 * This method is called by getDisplayList() when a display list is created or re-rendered. 13223 * It sets or resets the current value of all properties on that display list (resetting is 13224 * necessary when a display list is being re-created, because we need to make sure that 13225 * previously-set transform values 13226 */ 13227 void setDisplayListProperties(DisplayList displayList) { 13228 if (displayList != null) { 13229 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13230 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13231 if (mParent instanceof ViewGroup) { 13232 displayList.setClipChildren( 13233 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 13234 } 13235 float alpha = 1; 13236 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 13237 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13238 ViewGroup parentVG = (ViewGroup) mParent; 13239 final boolean hasTransform = 13240 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 13241 if (hasTransform) { 13242 Transformation transform = parentVG.mChildTransformation; 13243 final int transformType = parentVG.mChildTransformation.getTransformationType(); 13244 if (transformType != Transformation.TYPE_IDENTITY) { 13245 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 13246 alpha = transform.getAlpha(); 13247 } 13248 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 13249 displayList.setStaticMatrix(transform.getMatrix()); 13250 } 13251 } 13252 } 13253 } 13254 if (mTransformationInfo != null) { 13255 alpha *= mTransformationInfo.mAlpha; 13256 if (alpha < 1) { 13257 final int multipliedAlpha = (int) (255 * alpha); 13258 if (onSetAlpha(multipliedAlpha)) { 13259 alpha = 1; 13260 } 13261 } 13262 displayList.setTransformationInfo(alpha, 13263 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 13264 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 13265 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 13266 mTransformationInfo.mScaleY); 13267 if (mTransformationInfo.mCamera == null) { 13268 mTransformationInfo.mCamera = new Camera(); 13269 mTransformationInfo.matrix3D = new Matrix(); 13270 } 13271 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 13272 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 13273 displayList.setPivotX(getPivotX()); 13274 displayList.setPivotY(getPivotY()); 13275 } 13276 } else if (alpha < 1) { 13277 displayList.setAlpha(alpha); 13278 } 13279 } 13280 } 13281 13282 /** 13283 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 13284 * This draw() method is an implementation detail and is not intended to be overridden or 13285 * to be called from anywhere else other than ViewGroup.drawChild(). 13286 */ 13287 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 13288 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13289 boolean more = false; 13290 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 13291 final int flags = parent.mGroupFlags; 13292 13293 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 13294 parent.mChildTransformation.clear(); 13295 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13296 } 13297 13298 Transformation transformToApply = null; 13299 boolean concatMatrix = false; 13300 13301 boolean scalingRequired = false; 13302 boolean caching; 13303 int layerType = getLayerType(); 13304 13305 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 13306 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 13307 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 13308 caching = true; 13309 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 13310 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 13311 } else { 13312 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 13313 } 13314 13315 final Animation a = getAnimation(); 13316 if (a != null) { 13317 more = drawAnimation(parent, drawingTime, a, scalingRequired); 13318 concatMatrix = a.willChangeTransformationMatrix(); 13319 if (concatMatrix) { 13320 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13321 } 13322 transformToApply = parent.mChildTransformation; 13323 } else { 13324 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && 13325 mDisplayList != null) { 13326 // No longer animating: clear out old animation matrix 13327 mDisplayList.setAnimationMatrix(null); 13328 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13329 } 13330 if (!useDisplayListProperties && 13331 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13332 final boolean hasTransform = 13333 parent.getChildStaticTransformation(this, parent.mChildTransformation); 13334 if (hasTransform) { 13335 final int transformType = parent.mChildTransformation.getTransformationType(); 13336 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 13337 parent.mChildTransformation : null; 13338 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 13339 } 13340 } 13341 } 13342 13343 concatMatrix |= !childHasIdentityMatrix; 13344 13345 // Sets the flag as early as possible to allow draw() implementations 13346 // to call invalidate() successfully when doing animations 13347 mPrivateFlags |= PFLAG_DRAWN; 13348 13349 if (!concatMatrix && 13350 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 13351 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 13352 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 13353 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 13354 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 13355 return more; 13356 } 13357 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 13358 13359 if (hardwareAccelerated) { 13360 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 13361 // retain the flag's value temporarily in the mRecreateDisplayList flag 13362 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 13363 mPrivateFlags &= ~PFLAG_INVALIDATED; 13364 } 13365 13366 DisplayList displayList = null; 13367 Bitmap cache = null; 13368 boolean hasDisplayList = false; 13369 if (caching) { 13370 if (!hardwareAccelerated) { 13371 if (layerType != LAYER_TYPE_NONE) { 13372 layerType = LAYER_TYPE_SOFTWARE; 13373 buildDrawingCache(true); 13374 } 13375 cache = getDrawingCache(true); 13376 } else { 13377 switch (layerType) { 13378 case LAYER_TYPE_SOFTWARE: 13379 if (useDisplayListProperties) { 13380 hasDisplayList = canHaveDisplayList(); 13381 } else { 13382 buildDrawingCache(true); 13383 cache = getDrawingCache(true); 13384 } 13385 break; 13386 case LAYER_TYPE_HARDWARE: 13387 if (useDisplayListProperties) { 13388 hasDisplayList = canHaveDisplayList(); 13389 } 13390 break; 13391 case LAYER_TYPE_NONE: 13392 // Delay getting the display list until animation-driven alpha values are 13393 // set up and possibly passed on to the view 13394 hasDisplayList = canHaveDisplayList(); 13395 break; 13396 } 13397 } 13398 } 13399 useDisplayListProperties &= hasDisplayList; 13400 if (useDisplayListProperties) { 13401 displayList = getDisplayList(); 13402 if (!displayList.isValid()) { 13403 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13404 // to getDisplayList(), the display list will be marked invalid and we should not 13405 // try to use it again. 13406 displayList = null; 13407 hasDisplayList = false; 13408 useDisplayListProperties = false; 13409 } 13410 } 13411 13412 int sx = 0; 13413 int sy = 0; 13414 if (!hasDisplayList) { 13415 computeScroll(); 13416 sx = mScrollX; 13417 sy = mScrollY; 13418 } 13419 13420 final boolean hasNoCache = cache == null || hasDisplayList; 13421 final boolean offsetForScroll = cache == null && !hasDisplayList && 13422 layerType != LAYER_TYPE_HARDWARE; 13423 13424 int restoreTo = -1; 13425 if (!useDisplayListProperties || transformToApply != null) { 13426 restoreTo = canvas.save(); 13427 } 13428 if (offsetForScroll) { 13429 canvas.translate(mLeft - sx, mTop - sy); 13430 } else { 13431 if (!useDisplayListProperties) { 13432 canvas.translate(mLeft, mTop); 13433 } 13434 if (scalingRequired) { 13435 if (useDisplayListProperties) { 13436 // TODO: Might not need this if we put everything inside the DL 13437 restoreTo = canvas.save(); 13438 } 13439 // mAttachInfo cannot be null, otherwise scalingRequired == false 13440 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13441 canvas.scale(scale, scale); 13442 } 13443 } 13444 13445 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13446 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13447 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13448 if (transformToApply != null || !childHasIdentityMatrix) { 13449 int transX = 0; 13450 int transY = 0; 13451 13452 if (offsetForScroll) { 13453 transX = -sx; 13454 transY = -sy; 13455 } 13456 13457 if (transformToApply != null) { 13458 if (concatMatrix) { 13459 if (useDisplayListProperties) { 13460 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13461 } else { 13462 // Undo the scroll translation, apply the transformation matrix, 13463 // then redo the scroll translate to get the correct result. 13464 canvas.translate(-transX, -transY); 13465 canvas.concat(transformToApply.getMatrix()); 13466 canvas.translate(transX, transY); 13467 } 13468 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13469 } 13470 13471 float transformAlpha = transformToApply.getAlpha(); 13472 if (transformAlpha < 1) { 13473 alpha *= transformAlpha; 13474 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13475 } 13476 } 13477 13478 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13479 canvas.translate(-transX, -transY); 13480 canvas.concat(getMatrix()); 13481 canvas.translate(transX, transY); 13482 } 13483 } 13484 13485 // Deal with alpha if it is or used to be <1 13486 if (alpha < 1 || 13487 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13488 if (alpha < 1) { 13489 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13490 } else { 13491 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13492 } 13493 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13494 if (hasNoCache) { 13495 final int multipliedAlpha = (int) (255 * alpha); 13496 if (!onSetAlpha(multipliedAlpha)) { 13497 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13498 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13499 layerType != LAYER_TYPE_NONE) { 13500 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13501 } 13502 if (useDisplayListProperties) { 13503 displayList.setAlpha(alpha * getAlpha()); 13504 } else if (layerType == LAYER_TYPE_NONE) { 13505 final int scrollX = hasDisplayList ? 0 : sx; 13506 final int scrollY = hasDisplayList ? 0 : sy; 13507 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13508 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13509 } 13510 } else { 13511 // Alpha is handled by the child directly, clobber the layer's alpha 13512 mPrivateFlags |= PFLAG_ALPHA_SET; 13513 } 13514 } 13515 } 13516 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13517 onSetAlpha(255); 13518 mPrivateFlags &= ~PFLAG_ALPHA_SET; 13519 } 13520 13521 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13522 !useDisplayListProperties) { 13523 if (offsetForScroll) { 13524 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13525 } else { 13526 if (!scalingRequired || cache == null) { 13527 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13528 } else { 13529 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13530 } 13531 } 13532 } 13533 13534 if (!useDisplayListProperties && hasDisplayList) { 13535 displayList = getDisplayList(); 13536 if (!displayList.isValid()) { 13537 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13538 // to getDisplayList(), the display list will be marked invalid and we should not 13539 // try to use it again. 13540 displayList = null; 13541 hasDisplayList = false; 13542 } 13543 } 13544 13545 if (hasNoCache) { 13546 boolean layerRendered = false; 13547 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13548 final HardwareLayer layer = getHardwareLayer(); 13549 if (layer != null && layer.isValid()) { 13550 mLayerPaint.setAlpha((int) (alpha * 255)); 13551 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13552 layerRendered = true; 13553 } else { 13554 final int scrollX = hasDisplayList ? 0 : sx; 13555 final int scrollY = hasDisplayList ? 0 : sy; 13556 canvas.saveLayer(scrollX, scrollY, 13557 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13558 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13559 } 13560 } 13561 13562 if (!layerRendered) { 13563 if (!hasDisplayList) { 13564 // Fast path for layouts with no backgrounds 13565 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13566 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13567 dispatchDraw(canvas); 13568 } else { 13569 draw(canvas); 13570 } 13571 } else { 13572 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13573 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13574 } 13575 } 13576 } else if (cache != null) { 13577 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13578 Paint cachePaint; 13579 13580 if (layerType == LAYER_TYPE_NONE) { 13581 cachePaint = parent.mCachePaint; 13582 if (cachePaint == null) { 13583 cachePaint = new Paint(); 13584 cachePaint.setDither(false); 13585 parent.mCachePaint = cachePaint; 13586 } 13587 if (alpha < 1) { 13588 cachePaint.setAlpha((int) (alpha * 255)); 13589 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13590 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13591 cachePaint.setAlpha(255); 13592 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13593 } 13594 } else { 13595 cachePaint = mLayerPaint; 13596 cachePaint.setAlpha((int) (alpha * 255)); 13597 } 13598 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13599 } 13600 13601 if (restoreTo >= 0) { 13602 canvas.restoreToCount(restoreTo); 13603 } 13604 13605 if (a != null && !more) { 13606 if (!hardwareAccelerated && !a.getFillAfter()) { 13607 onSetAlpha(255); 13608 } 13609 parent.finishAnimatingView(this, a); 13610 } 13611 13612 if (more && hardwareAccelerated) { 13613 // invalidation is the trigger to recreate display lists, so if we're using 13614 // display lists to render, force an invalidate to allow the animation to 13615 // continue drawing another frame 13616 parent.invalidate(true); 13617 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13618 // alpha animations should cause the child to recreate its display list 13619 invalidate(true); 13620 } 13621 } 13622 13623 mRecreateDisplayList = false; 13624 13625 return more; 13626 } 13627 13628 /** 13629 * Manually render this view (and all of its children) to the given Canvas. 13630 * The view must have already done a full layout before this function is 13631 * called. When implementing a view, implement 13632 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13633 * If you do need to override this method, call the superclass version. 13634 * 13635 * @param canvas The Canvas to which the View is rendered. 13636 */ 13637 public void draw(Canvas canvas) { 13638 final int privateFlags = mPrivateFlags; 13639 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 13640 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13641 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 13642 13643 /* 13644 * Draw traversal performs several drawing steps which must be executed 13645 * in the appropriate order: 13646 * 13647 * 1. Draw the background 13648 * 2. If necessary, save the canvas' layers to prepare for fading 13649 * 3. Draw view's content 13650 * 4. Draw children 13651 * 5. If necessary, draw the fading edges and restore layers 13652 * 6. Draw decorations (scrollbars for instance) 13653 */ 13654 13655 // Step 1, draw the background, if needed 13656 int saveCount; 13657 13658 if (!dirtyOpaque) { 13659 final Drawable background = mBackground; 13660 if (background != null) { 13661 final int scrollX = mScrollX; 13662 final int scrollY = mScrollY; 13663 13664 if (mBackgroundSizeChanged) { 13665 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13666 mBackgroundSizeChanged = false; 13667 } 13668 13669 if ((scrollX | scrollY) == 0) { 13670 background.draw(canvas); 13671 } else { 13672 canvas.translate(scrollX, scrollY); 13673 background.draw(canvas); 13674 canvas.translate(-scrollX, -scrollY); 13675 } 13676 } 13677 } 13678 13679 // skip step 2 & 5 if possible (common case) 13680 final int viewFlags = mViewFlags; 13681 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13682 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13683 if (!verticalEdges && !horizontalEdges) { 13684 // Step 3, draw the content 13685 if (!dirtyOpaque) onDraw(canvas); 13686 13687 // Step 4, draw the children 13688 dispatchDraw(canvas); 13689 13690 // Step 6, draw decorations (scrollbars) 13691 onDrawScrollBars(canvas); 13692 13693 // we're done... 13694 return; 13695 } 13696 13697 /* 13698 * Here we do the full fledged routine... 13699 * (this is an uncommon case where speed matters less, 13700 * this is why we repeat some of the tests that have been 13701 * done above) 13702 */ 13703 13704 boolean drawTop = false; 13705 boolean drawBottom = false; 13706 boolean drawLeft = false; 13707 boolean drawRight = false; 13708 13709 float topFadeStrength = 0.0f; 13710 float bottomFadeStrength = 0.0f; 13711 float leftFadeStrength = 0.0f; 13712 float rightFadeStrength = 0.0f; 13713 13714 // Step 2, save the canvas' layers 13715 int paddingLeft = mPaddingLeft; 13716 13717 final boolean offsetRequired = isPaddingOffsetRequired(); 13718 if (offsetRequired) { 13719 paddingLeft += getLeftPaddingOffset(); 13720 } 13721 13722 int left = mScrollX + paddingLeft; 13723 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13724 int top = mScrollY + getFadeTop(offsetRequired); 13725 int bottom = top + getFadeHeight(offsetRequired); 13726 13727 if (offsetRequired) { 13728 right += getRightPaddingOffset(); 13729 bottom += getBottomPaddingOffset(); 13730 } 13731 13732 final ScrollabilityCache scrollabilityCache = mScrollCache; 13733 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13734 int length = (int) fadeHeight; 13735 13736 // clip the fade length if top and bottom fades overlap 13737 // overlapping fades produce odd-looking artifacts 13738 if (verticalEdges && (top + length > bottom - length)) { 13739 length = (bottom - top) / 2; 13740 } 13741 13742 // also clip horizontal fades if necessary 13743 if (horizontalEdges && (left + length > right - length)) { 13744 length = (right - left) / 2; 13745 } 13746 13747 if (verticalEdges) { 13748 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13749 drawTop = topFadeStrength * fadeHeight > 1.0f; 13750 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13751 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13752 } 13753 13754 if (horizontalEdges) { 13755 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13756 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13757 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13758 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13759 } 13760 13761 saveCount = canvas.getSaveCount(); 13762 13763 int solidColor = getSolidColor(); 13764 if (solidColor == 0) { 13765 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13766 13767 if (drawTop) { 13768 canvas.saveLayer(left, top, right, top + length, null, flags); 13769 } 13770 13771 if (drawBottom) { 13772 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13773 } 13774 13775 if (drawLeft) { 13776 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13777 } 13778 13779 if (drawRight) { 13780 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13781 } 13782 } else { 13783 scrollabilityCache.setFadeColor(solidColor); 13784 } 13785 13786 // Step 3, draw the content 13787 if (!dirtyOpaque) onDraw(canvas); 13788 13789 // Step 4, draw the children 13790 dispatchDraw(canvas); 13791 13792 // Step 5, draw the fade effect and restore layers 13793 final Paint p = scrollabilityCache.paint; 13794 final Matrix matrix = scrollabilityCache.matrix; 13795 final Shader fade = scrollabilityCache.shader; 13796 13797 if (drawTop) { 13798 matrix.setScale(1, fadeHeight * topFadeStrength); 13799 matrix.postTranslate(left, top); 13800 fade.setLocalMatrix(matrix); 13801 canvas.drawRect(left, top, right, top + length, p); 13802 } 13803 13804 if (drawBottom) { 13805 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13806 matrix.postRotate(180); 13807 matrix.postTranslate(left, bottom); 13808 fade.setLocalMatrix(matrix); 13809 canvas.drawRect(left, bottom - length, right, bottom, p); 13810 } 13811 13812 if (drawLeft) { 13813 matrix.setScale(1, fadeHeight * leftFadeStrength); 13814 matrix.postRotate(-90); 13815 matrix.postTranslate(left, top); 13816 fade.setLocalMatrix(matrix); 13817 canvas.drawRect(left, top, left + length, bottom, p); 13818 } 13819 13820 if (drawRight) { 13821 matrix.setScale(1, fadeHeight * rightFadeStrength); 13822 matrix.postRotate(90); 13823 matrix.postTranslate(right, top); 13824 fade.setLocalMatrix(matrix); 13825 canvas.drawRect(right - length, top, right, bottom, p); 13826 } 13827 13828 canvas.restoreToCount(saveCount); 13829 13830 // Step 6, draw decorations (scrollbars) 13831 onDrawScrollBars(canvas); 13832 } 13833 13834 /** 13835 * Override this if your view is known to always be drawn on top of a solid color background, 13836 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13837 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13838 * should be set to 0xFF. 13839 * 13840 * @see #setVerticalFadingEdgeEnabled(boolean) 13841 * @see #setHorizontalFadingEdgeEnabled(boolean) 13842 * 13843 * @return The known solid color background for this view, or 0 if the color may vary 13844 */ 13845 @ViewDebug.ExportedProperty(category = "drawing") 13846 public int getSolidColor() { 13847 return 0; 13848 } 13849 13850 /** 13851 * Build a human readable string representation of the specified view flags. 13852 * 13853 * @param flags the view flags to convert to a string 13854 * @return a String representing the supplied flags 13855 */ 13856 private static String printFlags(int flags) { 13857 String output = ""; 13858 int numFlags = 0; 13859 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13860 output += "TAKES_FOCUS"; 13861 numFlags++; 13862 } 13863 13864 switch (flags & VISIBILITY_MASK) { 13865 case INVISIBLE: 13866 if (numFlags > 0) { 13867 output += " "; 13868 } 13869 output += "INVISIBLE"; 13870 // USELESS HERE numFlags++; 13871 break; 13872 case GONE: 13873 if (numFlags > 0) { 13874 output += " "; 13875 } 13876 output += "GONE"; 13877 // USELESS HERE numFlags++; 13878 break; 13879 default: 13880 break; 13881 } 13882 return output; 13883 } 13884 13885 /** 13886 * Build a human readable string representation of the specified private 13887 * view flags. 13888 * 13889 * @param privateFlags the private view flags to convert to a string 13890 * @return a String representing the supplied flags 13891 */ 13892 private static String printPrivateFlags(int privateFlags) { 13893 String output = ""; 13894 int numFlags = 0; 13895 13896 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 13897 output += "WANTS_FOCUS"; 13898 numFlags++; 13899 } 13900 13901 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 13902 if (numFlags > 0) { 13903 output += " "; 13904 } 13905 output += "FOCUSED"; 13906 numFlags++; 13907 } 13908 13909 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 13910 if (numFlags > 0) { 13911 output += " "; 13912 } 13913 output += "SELECTED"; 13914 numFlags++; 13915 } 13916 13917 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 13918 if (numFlags > 0) { 13919 output += " "; 13920 } 13921 output += "IS_ROOT_NAMESPACE"; 13922 numFlags++; 13923 } 13924 13925 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 13926 if (numFlags > 0) { 13927 output += " "; 13928 } 13929 output += "HAS_BOUNDS"; 13930 numFlags++; 13931 } 13932 13933 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 13934 if (numFlags > 0) { 13935 output += " "; 13936 } 13937 output += "DRAWN"; 13938 // USELESS HERE numFlags++; 13939 } 13940 return output; 13941 } 13942 13943 /** 13944 * <p>Indicates whether or not this view's layout will be requested during 13945 * the next hierarchy layout pass.</p> 13946 * 13947 * @return true if the layout will be forced during next layout pass 13948 */ 13949 public boolean isLayoutRequested() { 13950 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 13951 } 13952 13953 /** 13954 * Return true if o is a ViewGroup that is laying out using optical bounds. 13955 * @hide 13956 */ 13957 public static boolean isLayoutModeOptical(Object o) { 13958 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 13959 } 13960 13961 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 13962 Insets parentInsets = mParent instanceof View ? 13963 ((View) mParent).getOpticalInsets() : Insets.NONE; 13964 Insets childInsets = getOpticalInsets(); 13965 return setFrame( 13966 left + parentInsets.left - childInsets.left, 13967 top + parentInsets.top - childInsets.top, 13968 right + parentInsets.left + childInsets.right, 13969 bottom + parentInsets.top + childInsets.bottom); 13970 } 13971 13972 /** 13973 * Assign a size and position to a view and all of its 13974 * descendants 13975 * 13976 * <p>This is the second phase of the layout mechanism. 13977 * (The first is measuring). In this phase, each parent calls 13978 * layout on all of its children to position them. 13979 * This is typically done using the child measurements 13980 * that were stored in the measure pass().</p> 13981 * 13982 * <p>Derived classes should not override this method. 13983 * Derived classes with children should override 13984 * onLayout. In that method, they should 13985 * call layout on each of their children.</p> 13986 * 13987 * @param l Left position, relative to parent 13988 * @param t Top position, relative to parent 13989 * @param r Right position, relative to parent 13990 * @param b Bottom position, relative to parent 13991 */ 13992 @SuppressWarnings({"unchecked"}) 13993 public void layout(int l, int t, int r, int b) { 13994 int oldL = mLeft; 13995 int oldT = mTop; 13996 int oldB = mBottom; 13997 int oldR = mRight; 13998 boolean changed = isLayoutModeOptical(mParent) ? 13999 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14000 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14001 onLayout(changed, l, t, r, b); 14002 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14003 14004 ListenerInfo li = mListenerInfo; 14005 if (li != null && li.mOnLayoutChangeListeners != null) { 14006 ArrayList<OnLayoutChangeListener> listenersCopy = 14007 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14008 int numListeners = listenersCopy.size(); 14009 for (int i = 0; i < numListeners; ++i) { 14010 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14011 } 14012 } 14013 } 14014 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14015 } 14016 14017 /** 14018 * Called from layout when this view should 14019 * assign a size and position to each of its children. 14020 * 14021 * Derived classes with children should override 14022 * this method and call layout on each of 14023 * their children. 14024 * @param changed This is a new size or position for this view 14025 * @param left Left position, relative to parent 14026 * @param top Top position, relative to parent 14027 * @param right Right position, relative to parent 14028 * @param bottom Bottom position, relative to parent 14029 */ 14030 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14031 } 14032 14033 /** 14034 * Assign a size and position to this view. 14035 * 14036 * This is called from layout. 14037 * 14038 * @param left Left position, relative to parent 14039 * @param top Top position, relative to parent 14040 * @param right Right position, relative to parent 14041 * @param bottom Bottom position, relative to parent 14042 * @return true if the new size and position are different than the 14043 * previous ones 14044 * {@hide} 14045 */ 14046 protected boolean setFrame(int left, int top, int right, int bottom) { 14047 boolean changed = false; 14048 14049 if (DBG) { 14050 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14051 + right + "," + bottom + ")"); 14052 } 14053 14054 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14055 changed = true; 14056 14057 // Remember our drawn bit 14058 int drawn = mPrivateFlags & PFLAG_DRAWN; 14059 14060 int oldWidth = mRight - mLeft; 14061 int oldHeight = mBottom - mTop; 14062 int newWidth = right - left; 14063 int newHeight = bottom - top; 14064 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14065 14066 // Invalidate our old position 14067 invalidate(sizeChanged); 14068 14069 mLeft = left; 14070 mTop = top; 14071 mRight = right; 14072 mBottom = bottom; 14073 if (mDisplayList != null) { 14074 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14075 } 14076 14077 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14078 14079 14080 if (sizeChanged) { 14081 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14082 // A change in dimension means an auto-centered pivot point changes, too 14083 if (mTransformationInfo != null) { 14084 mTransformationInfo.mMatrixDirty = true; 14085 } 14086 } 14087 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14088 } 14089 14090 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14091 // If we are visible, force the DRAWN bit to on so that 14092 // this invalidate will go through (at least to our parent). 14093 // This is because someone may have invalidated this view 14094 // before this call to setFrame came in, thereby clearing 14095 // the DRAWN bit. 14096 mPrivateFlags |= PFLAG_DRAWN; 14097 invalidate(sizeChanged); 14098 // parent display list may need to be recreated based on a change in the bounds 14099 // of any child 14100 invalidateParentCaches(); 14101 } 14102 14103 // Reset drawn bit to original value (invalidate turns it off) 14104 mPrivateFlags |= drawn; 14105 14106 mBackgroundSizeChanged = true; 14107 } 14108 return changed; 14109 } 14110 14111 /** 14112 * Finalize inflating a view from XML. This is called as the last phase 14113 * of inflation, after all child views have been added. 14114 * 14115 * <p>Even if the subclass overrides onFinishInflate, they should always be 14116 * sure to call the super method, so that we get called. 14117 */ 14118 protected void onFinishInflate() { 14119 } 14120 14121 /** 14122 * Returns the resources associated with this view. 14123 * 14124 * @return Resources object. 14125 */ 14126 public Resources getResources() { 14127 return mResources; 14128 } 14129 14130 /** 14131 * Invalidates the specified Drawable. 14132 * 14133 * @param drawable the drawable to invalidate 14134 */ 14135 public void invalidateDrawable(Drawable drawable) { 14136 if (verifyDrawable(drawable)) { 14137 final Rect dirty = drawable.getBounds(); 14138 final int scrollX = mScrollX; 14139 final int scrollY = mScrollY; 14140 14141 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14142 dirty.right + scrollX, dirty.bottom + scrollY); 14143 } 14144 } 14145 14146 /** 14147 * Schedules an action on a drawable to occur at a specified time. 14148 * 14149 * @param who the recipient of the action 14150 * @param what the action to run on the drawable 14151 * @param when the time at which the action must occur. Uses the 14152 * {@link SystemClock#uptimeMillis} timebase. 14153 */ 14154 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14155 if (verifyDrawable(who) && what != null) { 14156 final long delay = when - SystemClock.uptimeMillis(); 14157 if (mAttachInfo != null) { 14158 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14159 Choreographer.CALLBACK_ANIMATION, what, who, 14160 Choreographer.subtractFrameDelay(delay)); 14161 } else { 14162 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14163 } 14164 } 14165 } 14166 14167 /** 14168 * Cancels a scheduled action on a drawable. 14169 * 14170 * @param who the recipient of the action 14171 * @param what the action to cancel 14172 */ 14173 public void unscheduleDrawable(Drawable who, Runnable what) { 14174 if (verifyDrawable(who) && what != null) { 14175 if (mAttachInfo != null) { 14176 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14177 Choreographer.CALLBACK_ANIMATION, what, who); 14178 } else { 14179 ViewRootImpl.getRunQueue().removeCallbacks(what); 14180 } 14181 } 14182 } 14183 14184 /** 14185 * Unschedule any events associated with the given Drawable. This can be 14186 * used when selecting a new Drawable into a view, so that the previous 14187 * one is completely unscheduled. 14188 * 14189 * @param who The Drawable to unschedule. 14190 * 14191 * @see #drawableStateChanged 14192 */ 14193 public void unscheduleDrawable(Drawable who) { 14194 if (mAttachInfo != null && who != null) { 14195 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14196 Choreographer.CALLBACK_ANIMATION, null, who); 14197 } 14198 } 14199 14200 /** 14201 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 14202 * that the View directionality can and will be resolved before its Drawables. 14203 * 14204 * Will call {@link View#onResolveDrawables} when resolution is done. 14205 * 14206 * @hide 14207 */ 14208 protected void resolveDrawables() { 14209 if (mBackground != null) { 14210 mBackground.setLayoutDirection(getLayoutDirection()); 14211 } 14212 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 14213 onResolveDrawables(getLayoutDirection()); 14214 } 14215 14216 /** 14217 * Called when layout direction has been resolved. 14218 * 14219 * The default implementation does nothing. 14220 * 14221 * @param layoutDirection The resolved layout direction. 14222 * 14223 * @see #LAYOUT_DIRECTION_LTR 14224 * @see #LAYOUT_DIRECTION_RTL 14225 * 14226 * @hide 14227 */ 14228 public void onResolveDrawables(int layoutDirection) { 14229 } 14230 14231 /** 14232 * @hide 14233 */ 14234 protected void resetResolvedDrawables() { 14235 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 14236 } 14237 14238 private boolean isDrawablesResolved() { 14239 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 14240 } 14241 14242 /** 14243 * If your view subclass is displaying its own Drawable objects, it should 14244 * override this function and return true for any Drawable it is 14245 * displaying. This allows animations for those drawables to be 14246 * scheduled. 14247 * 14248 * <p>Be sure to call through to the super class when overriding this 14249 * function. 14250 * 14251 * @param who The Drawable to verify. Return true if it is one you are 14252 * displaying, else return the result of calling through to the 14253 * super class. 14254 * 14255 * @return boolean If true than the Drawable is being displayed in the 14256 * view; else false and it is not allowed to animate. 14257 * 14258 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 14259 * @see #drawableStateChanged() 14260 */ 14261 protected boolean verifyDrawable(Drawable who) { 14262 return who == mBackground; 14263 } 14264 14265 /** 14266 * This function is called whenever the state of the view changes in such 14267 * a way that it impacts the state of drawables being shown. 14268 * 14269 * <p>Be sure to call through to the superclass when overriding this 14270 * function. 14271 * 14272 * @see Drawable#setState(int[]) 14273 */ 14274 protected void drawableStateChanged() { 14275 Drawable d = mBackground; 14276 if (d != null && d.isStateful()) { 14277 d.setState(getDrawableState()); 14278 } 14279 } 14280 14281 /** 14282 * Call this to force a view to update its drawable state. This will cause 14283 * drawableStateChanged to be called on this view. Views that are interested 14284 * in the new state should call getDrawableState. 14285 * 14286 * @see #drawableStateChanged 14287 * @see #getDrawableState 14288 */ 14289 public void refreshDrawableState() { 14290 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 14291 drawableStateChanged(); 14292 14293 ViewParent parent = mParent; 14294 if (parent != null) { 14295 parent.childDrawableStateChanged(this); 14296 } 14297 } 14298 14299 /** 14300 * Return an array of resource IDs of the drawable states representing the 14301 * current state of the view. 14302 * 14303 * @return The current drawable state 14304 * 14305 * @see Drawable#setState(int[]) 14306 * @see #drawableStateChanged() 14307 * @see #onCreateDrawableState(int) 14308 */ 14309 public final int[] getDrawableState() { 14310 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 14311 return mDrawableState; 14312 } else { 14313 mDrawableState = onCreateDrawableState(0); 14314 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 14315 return mDrawableState; 14316 } 14317 } 14318 14319 /** 14320 * Generate the new {@link android.graphics.drawable.Drawable} state for 14321 * this view. This is called by the view 14322 * system when the cached Drawable state is determined to be invalid. To 14323 * retrieve the current state, you should use {@link #getDrawableState}. 14324 * 14325 * @param extraSpace if non-zero, this is the number of extra entries you 14326 * would like in the returned array in which you can place your own 14327 * states. 14328 * 14329 * @return Returns an array holding the current {@link Drawable} state of 14330 * the view. 14331 * 14332 * @see #mergeDrawableStates(int[], int[]) 14333 */ 14334 protected int[] onCreateDrawableState(int extraSpace) { 14335 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 14336 mParent instanceof View) { 14337 return ((View) mParent).onCreateDrawableState(extraSpace); 14338 } 14339 14340 int[] drawableState; 14341 14342 int privateFlags = mPrivateFlags; 14343 14344 int viewStateIndex = 0; 14345 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 14346 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 14347 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 14348 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 14349 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 14350 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 14351 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 14352 HardwareRenderer.isAvailable()) { 14353 // This is set if HW acceleration is requested, even if the current 14354 // process doesn't allow it. This is just to allow app preview 14355 // windows to better match their app. 14356 viewStateIndex |= VIEW_STATE_ACCELERATED; 14357 } 14358 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 14359 14360 final int privateFlags2 = mPrivateFlags2; 14361 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 14362 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 14363 14364 drawableState = VIEW_STATE_SETS[viewStateIndex]; 14365 14366 //noinspection ConstantIfStatement 14367 if (false) { 14368 Log.i("View", "drawableStateIndex=" + viewStateIndex); 14369 Log.i("View", toString() 14370 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 14371 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 14372 + " fo=" + hasFocus() 14373 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 14374 + " wf=" + hasWindowFocus() 14375 + ": " + Arrays.toString(drawableState)); 14376 } 14377 14378 if (extraSpace == 0) { 14379 return drawableState; 14380 } 14381 14382 final int[] fullState; 14383 if (drawableState != null) { 14384 fullState = new int[drawableState.length + extraSpace]; 14385 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 14386 } else { 14387 fullState = new int[extraSpace]; 14388 } 14389 14390 return fullState; 14391 } 14392 14393 /** 14394 * Merge your own state values in <var>additionalState</var> into the base 14395 * state values <var>baseState</var> that were returned by 14396 * {@link #onCreateDrawableState(int)}. 14397 * 14398 * @param baseState The base state values returned by 14399 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 14400 * own additional state values. 14401 * 14402 * @param additionalState The additional state values you would like 14403 * added to <var>baseState</var>; this array is not modified. 14404 * 14405 * @return As a convenience, the <var>baseState</var> array you originally 14406 * passed into the function is returned. 14407 * 14408 * @see #onCreateDrawableState(int) 14409 */ 14410 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 14411 final int N = baseState.length; 14412 int i = N - 1; 14413 while (i >= 0 && baseState[i] == 0) { 14414 i--; 14415 } 14416 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 14417 return baseState; 14418 } 14419 14420 /** 14421 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 14422 * on all Drawable objects associated with this view. 14423 */ 14424 public void jumpDrawablesToCurrentState() { 14425 if (mBackground != null) { 14426 mBackground.jumpToCurrentState(); 14427 } 14428 } 14429 14430 /** 14431 * Sets the background color for this view. 14432 * @param color the color of the background 14433 */ 14434 @RemotableViewMethod 14435 public void setBackgroundColor(int color) { 14436 if (mBackground instanceof ColorDrawable) { 14437 ((ColorDrawable) mBackground.mutate()).setColor(color); 14438 computeOpaqueFlags(); 14439 } else { 14440 setBackground(new ColorDrawable(color)); 14441 } 14442 } 14443 14444 /** 14445 * Set the background to a given resource. The resource should refer to 14446 * a Drawable object or 0 to remove the background. 14447 * @param resid The identifier of the resource. 14448 * 14449 * @attr ref android.R.styleable#View_background 14450 */ 14451 @RemotableViewMethod 14452 public void setBackgroundResource(int resid) { 14453 if (resid != 0 && resid == mBackgroundResource) { 14454 return; 14455 } 14456 14457 Drawable d= null; 14458 if (resid != 0) { 14459 d = mResources.getDrawable(resid); 14460 } 14461 setBackground(d); 14462 14463 mBackgroundResource = resid; 14464 } 14465 14466 /** 14467 * Set the background to a given Drawable, or remove the background. If the 14468 * background has padding, this View's padding is set to the background's 14469 * padding. However, when a background is removed, this View's padding isn't 14470 * touched. If setting the padding is desired, please use 14471 * {@link #setPadding(int, int, int, int)}. 14472 * 14473 * @param background The Drawable to use as the background, or null to remove the 14474 * background 14475 */ 14476 public void setBackground(Drawable background) { 14477 //noinspection deprecation 14478 setBackgroundDrawable(background); 14479 } 14480 14481 /** 14482 * @deprecated use {@link #setBackground(Drawable)} instead 14483 */ 14484 @Deprecated 14485 public void setBackgroundDrawable(Drawable background) { 14486 computeOpaqueFlags(); 14487 14488 if (background == mBackground) { 14489 return; 14490 } 14491 14492 boolean requestLayout = false; 14493 14494 mBackgroundResource = 0; 14495 14496 /* 14497 * Regardless of whether we're setting a new background or not, we want 14498 * to clear the previous drawable. 14499 */ 14500 if (mBackground != null) { 14501 mBackground.setCallback(null); 14502 unscheduleDrawable(mBackground); 14503 } 14504 14505 if (background != null) { 14506 Rect padding = sThreadLocal.get(); 14507 if (padding == null) { 14508 padding = new Rect(); 14509 sThreadLocal.set(padding); 14510 } 14511 resetResolvedDrawables(); 14512 background.setLayoutDirection(getLayoutDirection()); 14513 if (background.getPadding(padding)) { 14514 resetResolvedPadding(); 14515 switch (background.getLayoutDirection()) { 14516 case LAYOUT_DIRECTION_RTL: 14517 mUserPaddingLeftInitial = padding.right; 14518 mUserPaddingRightInitial = padding.left; 14519 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 14520 break; 14521 case LAYOUT_DIRECTION_LTR: 14522 default: 14523 mUserPaddingLeftInitial = padding.left; 14524 mUserPaddingRightInitial = padding.right; 14525 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 14526 } 14527 } 14528 14529 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14530 // if it has a different minimum size, we should layout again 14531 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14532 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14533 requestLayout = true; 14534 } 14535 14536 background.setCallback(this); 14537 if (background.isStateful()) { 14538 background.setState(getDrawableState()); 14539 } 14540 background.setVisible(getVisibility() == VISIBLE, false); 14541 mBackground = background; 14542 14543 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 14544 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 14545 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 14546 requestLayout = true; 14547 } 14548 } else { 14549 /* Remove the background */ 14550 mBackground = null; 14551 14552 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 14553 /* 14554 * This view ONLY drew the background before and we're removing 14555 * the background, so now it won't draw anything 14556 * (hence we SKIP_DRAW) 14557 */ 14558 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 14559 mPrivateFlags |= PFLAG_SKIP_DRAW; 14560 } 14561 14562 /* 14563 * When the background is set, we try to apply its padding to this 14564 * View. When the background is removed, we don't touch this View's 14565 * padding. This is noted in the Javadocs. Hence, we don't need to 14566 * requestLayout(), the invalidate() below is sufficient. 14567 */ 14568 14569 // The old background's minimum size could have affected this 14570 // View's layout, so let's requestLayout 14571 requestLayout = true; 14572 } 14573 14574 computeOpaqueFlags(); 14575 14576 if (requestLayout) { 14577 requestLayout(); 14578 } 14579 14580 mBackgroundSizeChanged = true; 14581 invalidate(true); 14582 } 14583 14584 /** 14585 * Gets the background drawable 14586 * 14587 * @return The drawable used as the background for this view, if any. 14588 * 14589 * @see #setBackground(Drawable) 14590 * 14591 * @attr ref android.R.styleable#View_background 14592 */ 14593 public Drawable getBackground() { 14594 return mBackground; 14595 } 14596 14597 /** 14598 * Sets the padding. The view may add on the space required to display 14599 * the scrollbars, depending on the style and visibility of the scrollbars. 14600 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14601 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14602 * from the values set in this call. 14603 * 14604 * @attr ref android.R.styleable#View_padding 14605 * @attr ref android.R.styleable#View_paddingBottom 14606 * @attr ref android.R.styleable#View_paddingLeft 14607 * @attr ref android.R.styleable#View_paddingRight 14608 * @attr ref android.R.styleable#View_paddingTop 14609 * @param left the left padding in pixels 14610 * @param top the top padding in pixels 14611 * @param right the right padding in pixels 14612 * @param bottom the bottom padding in pixels 14613 */ 14614 public void setPadding(int left, int top, int right, int bottom) { 14615 resetResolvedPadding(); 14616 14617 mUserPaddingStart = UNDEFINED_PADDING; 14618 mUserPaddingEnd = UNDEFINED_PADDING; 14619 14620 mUserPaddingLeftInitial = left; 14621 mUserPaddingRightInitial = right; 14622 14623 internalSetPadding(left, top, right, bottom); 14624 } 14625 14626 /** 14627 * @hide 14628 */ 14629 protected void internalSetPadding(int left, int top, int right, int bottom) { 14630 mUserPaddingLeft = left; 14631 mUserPaddingRight = right; 14632 mUserPaddingBottom = bottom; 14633 14634 final int viewFlags = mViewFlags; 14635 boolean changed = false; 14636 14637 // Common case is there are no scroll bars. 14638 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14639 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14640 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14641 ? 0 : getVerticalScrollbarWidth(); 14642 switch (mVerticalScrollbarPosition) { 14643 case SCROLLBAR_POSITION_DEFAULT: 14644 if (isLayoutRtl()) { 14645 left += offset; 14646 } else { 14647 right += offset; 14648 } 14649 break; 14650 case SCROLLBAR_POSITION_RIGHT: 14651 right += offset; 14652 break; 14653 case SCROLLBAR_POSITION_LEFT: 14654 left += offset; 14655 break; 14656 } 14657 } 14658 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14659 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14660 ? 0 : getHorizontalScrollbarHeight(); 14661 } 14662 } 14663 14664 if (mPaddingLeft != left) { 14665 changed = true; 14666 mPaddingLeft = left; 14667 } 14668 if (mPaddingTop != top) { 14669 changed = true; 14670 mPaddingTop = top; 14671 } 14672 if (mPaddingRight != right) { 14673 changed = true; 14674 mPaddingRight = right; 14675 } 14676 if (mPaddingBottom != bottom) { 14677 changed = true; 14678 mPaddingBottom = bottom; 14679 } 14680 14681 if (changed) { 14682 requestLayout(); 14683 } 14684 } 14685 14686 /** 14687 * Sets the relative padding. The view may add on the space required to display 14688 * the scrollbars, depending on the style and visibility of the scrollbars. 14689 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14690 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14691 * from the values set in this call. 14692 * 14693 * @attr ref android.R.styleable#View_padding 14694 * @attr ref android.R.styleable#View_paddingBottom 14695 * @attr ref android.R.styleable#View_paddingStart 14696 * @attr ref android.R.styleable#View_paddingEnd 14697 * @attr ref android.R.styleable#View_paddingTop 14698 * @param start the start padding in pixels 14699 * @param top the top padding in pixels 14700 * @param end the end padding in pixels 14701 * @param bottom the bottom padding in pixels 14702 */ 14703 public void setPaddingRelative(int start, int top, int end, int bottom) { 14704 resetResolvedPadding(); 14705 14706 mUserPaddingStart = start; 14707 mUserPaddingEnd = end; 14708 14709 switch(getLayoutDirection()) { 14710 case LAYOUT_DIRECTION_RTL: 14711 mUserPaddingLeftInitial = end; 14712 mUserPaddingRightInitial = start; 14713 internalSetPadding(end, top, start, bottom); 14714 break; 14715 case LAYOUT_DIRECTION_LTR: 14716 default: 14717 mUserPaddingLeftInitial = start; 14718 mUserPaddingRightInitial = end; 14719 internalSetPadding(start, top, end, bottom); 14720 } 14721 } 14722 14723 /** 14724 * Returns the top padding of this view. 14725 * 14726 * @return the top padding in pixels 14727 */ 14728 public int getPaddingTop() { 14729 return mPaddingTop; 14730 } 14731 14732 /** 14733 * Returns the bottom padding of this view. If there are inset and enabled 14734 * scrollbars, this value may include the space required to display the 14735 * scrollbars as well. 14736 * 14737 * @return the bottom padding in pixels 14738 */ 14739 public int getPaddingBottom() { 14740 return mPaddingBottom; 14741 } 14742 14743 /** 14744 * Returns the left padding of this view. If there are inset and enabled 14745 * scrollbars, this value may include the space required to display the 14746 * scrollbars as well. 14747 * 14748 * @return the left padding in pixels 14749 */ 14750 public int getPaddingLeft() { 14751 if (!isPaddingResolved()) { 14752 resolvePadding(); 14753 } 14754 return mPaddingLeft; 14755 } 14756 14757 /** 14758 * Returns the start padding of this view depending on its resolved layout direction. 14759 * If there are inset and enabled scrollbars, this value may include the space 14760 * required to display the scrollbars as well. 14761 * 14762 * @return the start padding in pixels 14763 */ 14764 public int getPaddingStart() { 14765 if (!isPaddingResolved()) { 14766 resolvePadding(); 14767 } 14768 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14769 mPaddingRight : mPaddingLeft; 14770 } 14771 14772 /** 14773 * Returns the right padding of this view. If there are inset and enabled 14774 * scrollbars, this value may include the space required to display the 14775 * scrollbars as well. 14776 * 14777 * @return the right padding in pixels 14778 */ 14779 public int getPaddingRight() { 14780 if (!isPaddingResolved()) { 14781 resolvePadding(); 14782 } 14783 return mPaddingRight; 14784 } 14785 14786 /** 14787 * Returns the end padding of this view depending on its resolved layout direction. 14788 * If there are inset and enabled scrollbars, this value may include the space 14789 * required to display the scrollbars as well. 14790 * 14791 * @return the end padding in pixels 14792 */ 14793 public int getPaddingEnd() { 14794 if (!isPaddingResolved()) { 14795 resolvePadding(); 14796 } 14797 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14798 mPaddingLeft : mPaddingRight; 14799 } 14800 14801 /** 14802 * Return if the padding as been set thru relative values 14803 * {@link #setPaddingRelative(int, int, int, int)} or thru 14804 * @attr ref android.R.styleable#View_paddingStart or 14805 * @attr ref android.R.styleable#View_paddingEnd 14806 * 14807 * @return true if the padding is relative or false if it is not. 14808 */ 14809 public boolean isPaddingRelative() { 14810 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 14811 } 14812 14813 Insets computeOpticalInsets() { 14814 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 14815 } 14816 14817 /** 14818 * @hide 14819 */ 14820 public void resetPaddingToInitialValues() { 14821 if (isRtlCompatibilityMode()) { 14822 mPaddingLeft = mUserPaddingLeftInitial; 14823 mPaddingRight = mUserPaddingRightInitial; 14824 return; 14825 } 14826 if (isLayoutRtl()) { 14827 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 14828 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 14829 } else { 14830 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 14831 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 14832 } 14833 } 14834 14835 /** 14836 * @hide 14837 */ 14838 public Insets getOpticalInsets() { 14839 if (mLayoutInsets == null) { 14840 mLayoutInsets = computeOpticalInsets(); 14841 } 14842 return mLayoutInsets; 14843 } 14844 14845 /** 14846 * Changes the selection state of this view. A view can be selected or not. 14847 * Note that selection is not the same as focus. Views are typically 14848 * selected in the context of an AdapterView like ListView or GridView; 14849 * the selected view is the view that is highlighted. 14850 * 14851 * @param selected true if the view must be selected, false otherwise 14852 */ 14853 public void setSelected(boolean selected) { 14854 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 14855 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 14856 if (!selected) resetPressedState(); 14857 invalidate(true); 14858 refreshDrawableState(); 14859 dispatchSetSelected(selected); 14860 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14861 notifyAccessibilityStateChanged(); 14862 } 14863 } 14864 } 14865 14866 /** 14867 * Dispatch setSelected to all of this View's children. 14868 * 14869 * @see #setSelected(boolean) 14870 * 14871 * @param selected The new selected state 14872 */ 14873 protected void dispatchSetSelected(boolean selected) { 14874 } 14875 14876 /** 14877 * Indicates the selection state of this view. 14878 * 14879 * @return true if the view is selected, false otherwise 14880 */ 14881 @ViewDebug.ExportedProperty 14882 public boolean isSelected() { 14883 return (mPrivateFlags & PFLAG_SELECTED) != 0; 14884 } 14885 14886 /** 14887 * Changes the activated state of this view. A view can be activated or not. 14888 * Note that activation is not the same as selection. Selection is 14889 * a transient property, representing the view (hierarchy) the user is 14890 * currently interacting with. Activation is a longer-term state that the 14891 * user can move views in and out of. For example, in a list view with 14892 * single or multiple selection enabled, the views in the current selection 14893 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14894 * here.) The activated state is propagated down to children of the view it 14895 * is set on. 14896 * 14897 * @param activated true if the view must be activated, false otherwise 14898 */ 14899 public void setActivated(boolean activated) { 14900 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 14901 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 14902 invalidate(true); 14903 refreshDrawableState(); 14904 dispatchSetActivated(activated); 14905 } 14906 } 14907 14908 /** 14909 * Dispatch setActivated to all of this View's children. 14910 * 14911 * @see #setActivated(boolean) 14912 * 14913 * @param activated The new activated state 14914 */ 14915 protected void dispatchSetActivated(boolean activated) { 14916 } 14917 14918 /** 14919 * Indicates the activation state of this view. 14920 * 14921 * @return true if the view is activated, false otherwise 14922 */ 14923 @ViewDebug.ExportedProperty 14924 public boolean isActivated() { 14925 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 14926 } 14927 14928 /** 14929 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14930 * observer can be used to get notifications when global events, like 14931 * layout, happen. 14932 * 14933 * The returned ViewTreeObserver observer is not guaranteed to remain 14934 * valid for the lifetime of this View. If the caller of this method keeps 14935 * a long-lived reference to ViewTreeObserver, it should always check for 14936 * the return value of {@link ViewTreeObserver#isAlive()}. 14937 * 14938 * @return The ViewTreeObserver for this view's hierarchy. 14939 */ 14940 public ViewTreeObserver getViewTreeObserver() { 14941 if (mAttachInfo != null) { 14942 return mAttachInfo.mTreeObserver; 14943 } 14944 if (mFloatingTreeObserver == null) { 14945 mFloatingTreeObserver = new ViewTreeObserver(); 14946 } 14947 return mFloatingTreeObserver; 14948 } 14949 14950 /** 14951 * <p>Finds the topmost view in the current view hierarchy.</p> 14952 * 14953 * @return the topmost view containing this view 14954 */ 14955 public View getRootView() { 14956 if (mAttachInfo != null) { 14957 final View v = mAttachInfo.mRootView; 14958 if (v != null) { 14959 return v; 14960 } 14961 } 14962 14963 View parent = this; 14964 14965 while (parent.mParent != null && parent.mParent instanceof View) { 14966 parent = (View) parent.mParent; 14967 } 14968 14969 return parent; 14970 } 14971 14972 /** 14973 * <p>Computes the coordinates of this view on the screen. The argument 14974 * must be an array of two integers. After the method returns, the array 14975 * contains the x and y location in that order.</p> 14976 * 14977 * @param location an array of two integers in which to hold the coordinates 14978 */ 14979 public void getLocationOnScreen(int[] location) { 14980 getLocationInWindow(location); 14981 14982 final AttachInfo info = mAttachInfo; 14983 if (info != null) { 14984 location[0] += info.mWindowLeft; 14985 location[1] += info.mWindowTop; 14986 } 14987 } 14988 14989 /** 14990 * <p>Computes the coordinates of this view in its window. The argument 14991 * must be an array of two integers. After the method returns, the array 14992 * contains the x and y location in that order.</p> 14993 * 14994 * @param location an array of two integers in which to hold the coordinates 14995 */ 14996 public void getLocationInWindow(int[] location) { 14997 if (location == null || location.length < 2) { 14998 throw new IllegalArgumentException("location must be an array of two integers"); 14999 } 15000 15001 if (mAttachInfo == null) { 15002 // When the view is not attached to a window, this method does not make sense 15003 location[0] = location[1] = 0; 15004 return; 15005 } 15006 15007 float[] position = mAttachInfo.mTmpTransformLocation; 15008 position[0] = position[1] = 0.0f; 15009 15010 if (!hasIdentityMatrix()) { 15011 getMatrix().mapPoints(position); 15012 } 15013 15014 position[0] += mLeft; 15015 position[1] += mTop; 15016 15017 ViewParent viewParent = mParent; 15018 while (viewParent instanceof View) { 15019 final View view = (View) viewParent; 15020 15021 position[0] -= view.mScrollX; 15022 position[1] -= view.mScrollY; 15023 15024 if (!view.hasIdentityMatrix()) { 15025 view.getMatrix().mapPoints(position); 15026 } 15027 15028 position[0] += view.mLeft; 15029 position[1] += view.mTop; 15030 15031 viewParent = view.mParent; 15032 } 15033 15034 if (viewParent instanceof ViewRootImpl) { 15035 // *cough* 15036 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15037 position[1] -= vr.mCurScrollY; 15038 } 15039 15040 location[0] = (int) (position[0] + 0.5f); 15041 location[1] = (int) (position[1] + 0.5f); 15042 } 15043 15044 /** 15045 * {@hide} 15046 * @param id the id of the view to be found 15047 * @return the view of the specified id, null if cannot be found 15048 */ 15049 protected View findViewTraversal(int id) { 15050 if (id == mID) { 15051 return this; 15052 } 15053 return null; 15054 } 15055 15056 /** 15057 * {@hide} 15058 * @param tag the tag of the view to be found 15059 * @return the view of specified tag, null if cannot be found 15060 */ 15061 protected View findViewWithTagTraversal(Object tag) { 15062 if (tag != null && tag.equals(mTag)) { 15063 return this; 15064 } 15065 return null; 15066 } 15067 15068 /** 15069 * {@hide} 15070 * @param predicate The predicate to evaluate. 15071 * @param childToSkip If not null, ignores this child during the recursive traversal. 15072 * @return The first view that matches the predicate or null. 15073 */ 15074 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15075 if (predicate.apply(this)) { 15076 return this; 15077 } 15078 return null; 15079 } 15080 15081 /** 15082 * Look for a child view with the given id. If this view has the given 15083 * id, return this view. 15084 * 15085 * @param id The id to search for. 15086 * @return The view that has the given id in the hierarchy or null 15087 */ 15088 public final View findViewById(int id) { 15089 if (id < 0) { 15090 return null; 15091 } 15092 return findViewTraversal(id); 15093 } 15094 15095 /** 15096 * Finds a view by its unuque and stable accessibility id. 15097 * 15098 * @param accessibilityId The searched accessibility id. 15099 * @return The found view. 15100 */ 15101 final View findViewByAccessibilityId(int accessibilityId) { 15102 if (accessibilityId < 0) { 15103 return null; 15104 } 15105 return findViewByAccessibilityIdTraversal(accessibilityId); 15106 } 15107 15108 /** 15109 * Performs the traversal to find a view by its unuque and stable accessibility id. 15110 * 15111 * <strong>Note:</strong>This method does not stop at the root namespace 15112 * boundary since the user can touch the screen at an arbitrary location 15113 * potentially crossing the root namespace bounday which will send an 15114 * accessibility event to accessibility services and they should be able 15115 * to obtain the event source. Also accessibility ids are guaranteed to be 15116 * unique in the window. 15117 * 15118 * @param accessibilityId The accessibility id. 15119 * @return The found view. 15120 */ 15121 View findViewByAccessibilityIdTraversal(int accessibilityId) { 15122 if (getAccessibilityViewId() == accessibilityId) { 15123 return this; 15124 } 15125 return null; 15126 } 15127 15128 /** 15129 * Look for a child view with the given tag. If this view has the given 15130 * tag, return this view. 15131 * 15132 * @param tag The tag to search for, using "tag.equals(getTag())". 15133 * @return The View that has the given tag in the hierarchy or null 15134 */ 15135 public final View findViewWithTag(Object tag) { 15136 if (tag == null) { 15137 return null; 15138 } 15139 return findViewWithTagTraversal(tag); 15140 } 15141 15142 /** 15143 * {@hide} 15144 * Look for a child view that matches the specified predicate. 15145 * If this view matches the predicate, return this view. 15146 * 15147 * @param predicate The predicate to evaluate. 15148 * @return The first view that matches the predicate or null. 15149 */ 15150 public final View findViewByPredicate(Predicate<View> predicate) { 15151 return findViewByPredicateTraversal(predicate, null); 15152 } 15153 15154 /** 15155 * {@hide} 15156 * Look for a child view that matches the specified predicate, 15157 * starting with the specified view and its descendents and then 15158 * recusively searching the ancestors and siblings of that view 15159 * until this view is reached. 15160 * 15161 * This method is useful in cases where the predicate does not match 15162 * a single unique view (perhaps multiple views use the same id) 15163 * and we are trying to find the view that is "closest" in scope to the 15164 * starting view. 15165 * 15166 * @param start The view to start from. 15167 * @param predicate The predicate to evaluate. 15168 * @return The first view that matches the predicate or null. 15169 */ 15170 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 15171 View childToSkip = null; 15172 for (;;) { 15173 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 15174 if (view != null || start == this) { 15175 return view; 15176 } 15177 15178 ViewParent parent = start.getParent(); 15179 if (parent == null || !(parent instanceof View)) { 15180 return null; 15181 } 15182 15183 childToSkip = start; 15184 start = (View) parent; 15185 } 15186 } 15187 15188 /** 15189 * Sets the identifier for this view. The identifier does not have to be 15190 * unique in this view's hierarchy. The identifier should be a positive 15191 * number. 15192 * 15193 * @see #NO_ID 15194 * @see #getId() 15195 * @see #findViewById(int) 15196 * 15197 * @param id a number used to identify the view 15198 * 15199 * @attr ref android.R.styleable#View_id 15200 */ 15201 public void setId(int id) { 15202 mID = id; 15203 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 15204 mID = generateViewId(); 15205 } 15206 } 15207 15208 /** 15209 * {@hide} 15210 * 15211 * @param isRoot true if the view belongs to the root namespace, false 15212 * otherwise 15213 */ 15214 public void setIsRootNamespace(boolean isRoot) { 15215 if (isRoot) { 15216 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 15217 } else { 15218 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 15219 } 15220 } 15221 15222 /** 15223 * {@hide} 15224 * 15225 * @return true if the view belongs to the root namespace, false otherwise 15226 */ 15227 public boolean isRootNamespace() { 15228 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 15229 } 15230 15231 /** 15232 * Returns this view's identifier. 15233 * 15234 * @return a positive integer used to identify the view or {@link #NO_ID} 15235 * if the view has no ID 15236 * 15237 * @see #setId(int) 15238 * @see #findViewById(int) 15239 * @attr ref android.R.styleable#View_id 15240 */ 15241 @ViewDebug.CapturedViewProperty 15242 public int getId() { 15243 return mID; 15244 } 15245 15246 /** 15247 * Returns this view's tag. 15248 * 15249 * @return the Object stored in this view as a tag 15250 * 15251 * @see #setTag(Object) 15252 * @see #getTag(int) 15253 */ 15254 @ViewDebug.ExportedProperty 15255 public Object getTag() { 15256 return mTag; 15257 } 15258 15259 /** 15260 * Sets the tag associated with this view. A tag can be used to mark 15261 * a view in its hierarchy and does not have to be unique within the 15262 * hierarchy. Tags can also be used to store data within a view without 15263 * resorting to another data structure. 15264 * 15265 * @param tag an Object to tag the view with 15266 * 15267 * @see #getTag() 15268 * @see #setTag(int, Object) 15269 */ 15270 public void setTag(final Object tag) { 15271 mTag = tag; 15272 } 15273 15274 /** 15275 * Returns the tag associated with this view and the specified key. 15276 * 15277 * @param key The key identifying the tag 15278 * 15279 * @return the Object stored in this view as a tag 15280 * 15281 * @see #setTag(int, Object) 15282 * @see #getTag() 15283 */ 15284 public Object getTag(int key) { 15285 if (mKeyedTags != null) return mKeyedTags.get(key); 15286 return null; 15287 } 15288 15289 /** 15290 * Sets a tag associated with this view and a key. A tag can be used 15291 * to mark a view in its hierarchy and does not have to be unique within 15292 * the hierarchy. Tags can also be used to store data within a view 15293 * without resorting to another data structure. 15294 * 15295 * The specified key should be an id declared in the resources of the 15296 * application to ensure it is unique (see the <a 15297 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 15298 * Keys identified as belonging to 15299 * the Android framework or not associated with any package will cause 15300 * an {@link IllegalArgumentException} to be thrown. 15301 * 15302 * @param key The key identifying the tag 15303 * @param tag An Object to tag the view with 15304 * 15305 * @throws IllegalArgumentException If they specified key is not valid 15306 * 15307 * @see #setTag(Object) 15308 * @see #getTag(int) 15309 */ 15310 public void setTag(int key, final Object tag) { 15311 // If the package id is 0x00 or 0x01, it's either an undefined package 15312 // or a framework id 15313 if ((key >>> 24) < 2) { 15314 throw new IllegalArgumentException("The key must be an application-specific " 15315 + "resource id."); 15316 } 15317 15318 setKeyedTag(key, tag); 15319 } 15320 15321 /** 15322 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 15323 * framework id. 15324 * 15325 * @hide 15326 */ 15327 public void setTagInternal(int key, Object tag) { 15328 if ((key >>> 24) != 0x1) { 15329 throw new IllegalArgumentException("The key must be a framework-specific " 15330 + "resource id."); 15331 } 15332 15333 setKeyedTag(key, tag); 15334 } 15335 15336 private void setKeyedTag(int key, Object tag) { 15337 if (mKeyedTags == null) { 15338 mKeyedTags = new SparseArray<Object>(); 15339 } 15340 15341 mKeyedTags.put(key, tag); 15342 } 15343 15344 /** 15345 * Prints information about this view in the log output, with the tag 15346 * {@link #VIEW_LOG_TAG}. 15347 * 15348 * @hide 15349 */ 15350 public void debug() { 15351 debug(0); 15352 } 15353 15354 /** 15355 * Prints information about this view in the log output, with the tag 15356 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 15357 * indentation defined by the <code>depth</code>. 15358 * 15359 * @param depth the indentation level 15360 * 15361 * @hide 15362 */ 15363 protected void debug(int depth) { 15364 String output = debugIndent(depth - 1); 15365 15366 output += "+ " + this; 15367 int id = getId(); 15368 if (id != -1) { 15369 output += " (id=" + id + ")"; 15370 } 15371 Object tag = getTag(); 15372 if (tag != null) { 15373 output += " (tag=" + tag + ")"; 15374 } 15375 Log.d(VIEW_LOG_TAG, output); 15376 15377 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 15378 output = debugIndent(depth) + " FOCUSED"; 15379 Log.d(VIEW_LOG_TAG, output); 15380 } 15381 15382 output = debugIndent(depth); 15383 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 15384 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 15385 + "} "; 15386 Log.d(VIEW_LOG_TAG, output); 15387 15388 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 15389 || mPaddingBottom != 0) { 15390 output = debugIndent(depth); 15391 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 15392 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 15393 Log.d(VIEW_LOG_TAG, output); 15394 } 15395 15396 output = debugIndent(depth); 15397 output += "mMeasureWidth=" + mMeasuredWidth + 15398 " mMeasureHeight=" + mMeasuredHeight; 15399 Log.d(VIEW_LOG_TAG, output); 15400 15401 output = debugIndent(depth); 15402 if (mLayoutParams == null) { 15403 output += "BAD! no layout params"; 15404 } else { 15405 output = mLayoutParams.debug(output); 15406 } 15407 Log.d(VIEW_LOG_TAG, output); 15408 15409 output = debugIndent(depth); 15410 output += "flags={"; 15411 output += View.printFlags(mViewFlags); 15412 output += "}"; 15413 Log.d(VIEW_LOG_TAG, output); 15414 15415 output = debugIndent(depth); 15416 output += "privateFlags={"; 15417 output += View.printPrivateFlags(mPrivateFlags); 15418 output += "}"; 15419 Log.d(VIEW_LOG_TAG, output); 15420 } 15421 15422 /** 15423 * Creates a string of whitespaces used for indentation. 15424 * 15425 * @param depth the indentation level 15426 * @return a String containing (depth * 2 + 3) * 2 white spaces 15427 * 15428 * @hide 15429 */ 15430 protected static String debugIndent(int depth) { 15431 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 15432 for (int i = 0; i < (depth * 2) + 3; i++) { 15433 spaces.append(' ').append(' '); 15434 } 15435 return spaces.toString(); 15436 } 15437 15438 /** 15439 * <p>Return the offset of the widget's text baseline from the widget's top 15440 * boundary. If this widget does not support baseline alignment, this 15441 * method returns -1. </p> 15442 * 15443 * @return the offset of the baseline within the widget's bounds or -1 15444 * if baseline alignment is not supported 15445 */ 15446 @ViewDebug.ExportedProperty(category = "layout") 15447 public int getBaseline() { 15448 return -1; 15449 } 15450 15451 /** 15452 * Returns whether the view hierarchy is currently undergoing a layout pass. This 15453 * information is useful to avoid situations such as calling {@link #requestLayout()} during 15454 * a layout pass. 15455 * 15456 * @return whether the view hierarchy is currently undergoing a layout pass 15457 */ 15458 public boolean isInLayout() { 15459 ViewRootImpl viewRoot = getViewRootImpl(); 15460 return (viewRoot != null && viewRoot.isInLayout()); 15461 } 15462 15463 /** 15464 * Call this when something has changed which has invalidated the 15465 * layout of this view. This will schedule a layout pass of the view 15466 * tree. This should not be called while the view hierarchy is currently in a layout 15467 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 15468 * end of the current layout pass (and then layout will run again) or after the current 15469 * frame is drawn and the next layout occurs. 15470 * 15471 * <p>Subclasses which override this method should call the superclass method to 15472 * handle possible request-during-layout errors correctly.</p> 15473 */ 15474 public void requestLayout() { 15475 ViewRootImpl viewRoot = getViewRootImpl(); 15476 if (viewRoot != null && viewRoot.isInLayout()) { 15477 viewRoot.requestLayoutDuringLayout(this); 15478 return; 15479 } 15480 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15481 mPrivateFlags |= PFLAG_INVALIDATED; 15482 15483 if (mParent != null && !mParent.isLayoutRequested()) { 15484 mParent.requestLayout(); 15485 } 15486 } 15487 15488 /** 15489 * Forces this view to be laid out during the next layout pass. 15490 * This method does not call requestLayout() or forceLayout() 15491 * on the parent. 15492 */ 15493 public void forceLayout() { 15494 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15495 mPrivateFlags |= PFLAG_INVALIDATED; 15496 } 15497 15498 /** 15499 * <p> 15500 * This is called to find out how big a view should be. The parent 15501 * supplies constraint information in the width and height parameters. 15502 * </p> 15503 * 15504 * <p> 15505 * The actual measurement work of a view is performed in 15506 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 15507 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 15508 * </p> 15509 * 15510 * 15511 * @param widthMeasureSpec Horizontal space requirements as imposed by the 15512 * parent 15513 * @param heightMeasureSpec Vertical space requirements as imposed by the 15514 * parent 15515 * 15516 * @see #onMeasure(int, int) 15517 */ 15518 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 15519 boolean optical = isLayoutModeOptical(this); 15520 if (optical != isLayoutModeOptical(mParent)) { 15521 Insets insets = getOpticalInsets(); 15522 int oWidth = insets.left + insets.right; 15523 int oHeight = insets.top + insets.bottom; 15524 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 15525 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 15526 } 15527 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 15528 widthMeasureSpec != mOldWidthMeasureSpec || 15529 heightMeasureSpec != mOldHeightMeasureSpec) { 15530 15531 // first clears the measured dimension flag 15532 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 15533 15534 resolveRtlPropertiesIfNeeded(); 15535 15536 // measure ourselves, this should set the measured dimension flag back 15537 onMeasure(widthMeasureSpec, heightMeasureSpec); 15538 15539 // flag not set, setMeasuredDimension() was not invoked, we raise 15540 // an exception to warn the developer 15541 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 15542 throw new IllegalStateException("onMeasure() did not set the" 15543 + " measured dimension by calling" 15544 + " setMeasuredDimension()"); 15545 } 15546 15547 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 15548 } 15549 15550 mOldWidthMeasureSpec = widthMeasureSpec; 15551 mOldHeightMeasureSpec = heightMeasureSpec; 15552 } 15553 15554 /** 15555 * <p> 15556 * Measure the view and its content to determine the measured width and the 15557 * measured height. This method is invoked by {@link #measure(int, int)} and 15558 * should be overriden by subclasses to provide accurate and efficient 15559 * measurement of their contents. 15560 * </p> 15561 * 15562 * <p> 15563 * <strong>CONTRACT:</strong> When overriding this method, you 15564 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15565 * measured width and height of this view. Failure to do so will trigger an 15566 * <code>IllegalStateException</code>, thrown by 15567 * {@link #measure(int, int)}. Calling the superclass' 15568 * {@link #onMeasure(int, int)} is a valid use. 15569 * </p> 15570 * 15571 * <p> 15572 * The base class implementation of measure defaults to the background size, 15573 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15574 * override {@link #onMeasure(int, int)} to provide better measurements of 15575 * their content. 15576 * </p> 15577 * 15578 * <p> 15579 * If this method is overridden, it is the subclass's responsibility to make 15580 * sure the measured height and width are at least the view's minimum height 15581 * and width ({@link #getSuggestedMinimumHeight()} and 15582 * {@link #getSuggestedMinimumWidth()}). 15583 * </p> 15584 * 15585 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15586 * The requirements are encoded with 15587 * {@link android.view.View.MeasureSpec}. 15588 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15589 * The requirements are encoded with 15590 * {@link android.view.View.MeasureSpec}. 15591 * 15592 * @see #getMeasuredWidth() 15593 * @see #getMeasuredHeight() 15594 * @see #setMeasuredDimension(int, int) 15595 * @see #getSuggestedMinimumHeight() 15596 * @see #getSuggestedMinimumWidth() 15597 * @see android.view.View.MeasureSpec#getMode(int) 15598 * @see android.view.View.MeasureSpec#getSize(int) 15599 */ 15600 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15601 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15602 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15603 } 15604 15605 /** 15606 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15607 * measured width and measured height. Failing to do so will trigger an 15608 * exception at measurement time.</p> 15609 * 15610 * @param measuredWidth The measured width of this view. May be a complex 15611 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15612 * {@link #MEASURED_STATE_TOO_SMALL}. 15613 * @param measuredHeight The measured height of this view. May be a complex 15614 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15615 * {@link #MEASURED_STATE_TOO_SMALL}. 15616 */ 15617 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15618 boolean optical = isLayoutModeOptical(this); 15619 if (optical != isLayoutModeOptical(mParent)) { 15620 Insets insets = getOpticalInsets(); 15621 int opticalWidth = insets.left + insets.right; 15622 int opticalHeight = insets.top + insets.bottom; 15623 15624 measuredWidth += optical ? opticalWidth : -opticalWidth; 15625 measuredHeight += optical ? opticalHeight : -opticalHeight; 15626 } 15627 mMeasuredWidth = measuredWidth; 15628 mMeasuredHeight = measuredHeight; 15629 15630 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 15631 } 15632 15633 /** 15634 * Merge two states as returned by {@link #getMeasuredState()}. 15635 * @param curState The current state as returned from a view or the result 15636 * of combining multiple views. 15637 * @param newState The new view state to combine. 15638 * @return Returns a new integer reflecting the combination of the two 15639 * states. 15640 */ 15641 public static int combineMeasuredStates(int curState, int newState) { 15642 return curState | newState; 15643 } 15644 15645 /** 15646 * Version of {@link #resolveSizeAndState(int, int, int)} 15647 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15648 */ 15649 public static int resolveSize(int size, int measureSpec) { 15650 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15651 } 15652 15653 /** 15654 * Utility to reconcile a desired size and state, with constraints imposed 15655 * by a MeasureSpec. Will take the desired size, unless a different size 15656 * is imposed by the constraints. The returned value is a compound integer, 15657 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15658 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15659 * size is smaller than the size the view wants to be. 15660 * 15661 * @param size How big the view wants to be 15662 * @param measureSpec Constraints imposed by the parent 15663 * @return Size information bit mask as defined by 15664 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15665 */ 15666 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15667 int result = size; 15668 int specMode = MeasureSpec.getMode(measureSpec); 15669 int specSize = MeasureSpec.getSize(measureSpec); 15670 switch (specMode) { 15671 case MeasureSpec.UNSPECIFIED: 15672 result = size; 15673 break; 15674 case MeasureSpec.AT_MOST: 15675 if (specSize < size) { 15676 result = specSize | MEASURED_STATE_TOO_SMALL; 15677 } else { 15678 result = size; 15679 } 15680 break; 15681 case MeasureSpec.EXACTLY: 15682 result = specSize; 15683 break; 15684 } 15685 return result | (childMeasuredState&MEASURED_STATE_MASK); 15686 } 15687 15688 /** 15689 * Utility to return a default size. Uses the supplied size if the 15690 * MeasureSpec imposed no constraints. Will get larger if allowed 15691 * by the MeasureSpec. 15692 * 15693 * @param size Default size for this view 15694 * @param measureSpec Constraints imposed by the parent 15695 * @return The size this view should be. 15696 */ 15697 public static int getDefaultSize(int size, int measureSpec) { 15698 int result = size; 15699 int specMode = MeasureSpec.getMode(measureSpec); 15700 int specSize = MeasureSpec.getSize(measureSpec); 15701 15702 switch (specMode) { 15703 case MeasureSpec.UNSPECIFIED: 15704 result = size; 15705 break; 15706 case MeasureSpec.AT_MOST: 15707 case MeasureSpec.EXACTLY: 15708 result = specSize; 15709 break; 15710 } 15711 return result; 15712 } 15713 15714 /** 15715 * Returns the suggested minimum height that the view should use. This 15716 * returns the maximum of the view's minimum height 15717 * and the background's minimum height 15718 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15719 * <p> 15720 * When being used in {@link #onMeasure(int, int)}, the caller should still 15721 * ensure the returned height is within the requirements of the parent. 15722 * 15723 * @return The suggested minimum height of the view. 15724 */ 15725 protected int getSuggestedMinimumHeight() { 15726 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15727 15728 } 15729 15730 /** 15731 * Returns the suggested minimum width that the view should use. This 15732 * returns the maximum of the view's minimum width) 15733 * and the background's minimum width 15734 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15735 * <p> 15736 * When being used in {@link #onMeasure(int, int)}, the caller should still 15737 * ensure the returned width is within the requirements of the parent. 15738 * 15739 * @return The suggested minimum width of the view. 15740 */ 15741 protected int getSuggestedMinimumWidth() { 15742 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15743 } 15744 15745 /** 15746 * Returns the minimum height of the view. 15747 * 15748 * @return the minimum height the view will try to be. 15749 * 15750 * @see #setMinimumHeight(int) 15751 * 15752 * @attr ref android.R.styleable#View_minHeight 15753 */ 15754 public int getMinimumHeight() { 15755 return mMinHeight; 15756 } 15757 15758 /** 15759 * Sets the minimum height of the view. It is not guaranteed the view will 15760 * be able to achieve this minimum height (for example, if its parent layout 15761 * constrains it with less available height). 15762 * 15763 * @param minHeight The minimum height the view will try to be. 15764 * 15765 * @see #getMinimumHeight() 15766 * 15767 * @attr ref android.R.styleable#View_minHeight 15768 */ 15769 public void setMinimumHeight(int minHeight) { 15770 mMinHeight = minHeight; 15771 requestLayout(); 15772 } 15773 15774 /** 15775 * Returns the minimum width of the view. 15776 * 15777 * @return the minimum width the view will try to be. 15778 * 15779 * @see #setMinimumWidth(int) 15780 * 15781 * @attr ref android.R.styleable#View_minWidth 15782 */ 15783 public int getMinimumWidth() { 15784 return mMinWidth; 15785 } 15786 15787 /** 15788 * Sets the minimum width of the view. It is not guaranteed the view will 15789 * be able to achieve this minimum width (for example, if its parent layout 15790 * constrains it with less available width). 15791 * 15792 * @param minWidth The minimum width the view will try to be. 15793 * 15794 * @see #getMinimumWidth() 15795 * 15796 * @attr ref android.R.styleable#View_minWidth 15797 */ 15798 public void setMinimumWidth(int minWidth) { 15799 mMinWidth = minWidth; 15800 requestLayout(); 15801 15802 } 15803 15804 /** 15805 * Get the animation currently associated with this view. 15806 * 15807 * @return The animation that is currently playing or 15808 * scheduled to play for this view. 15809 */ 15810 public Animation getAnimation() { 15811 return mCurrentAnimation; 15812 } 15813 15814 /** 15815 * Start the specified animation now. 15816 * 15817 * @param animation the animation to start now 15818 */ 15819 public void startAnimation(Animation animation) { 15820 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15821 setAnimation(animation); 15822 invalidateParentCaches(); 15823 invalidate(true); 15824 } 15825 15826 /** 15827 * Cancels any animations for this view. 15828 */ 15829 public void clearAnimation() { 15830 if (mCurrentAnimation != null) { 15831 mCurrentAnimation.detach(); 15832 } 15833 mCurrentAnimation = null; 15834 invalidateParentIfNeeded(); 15835 } 15836 15837 /** 15838 * Sets the next animation to play for this view. 15839 * If you want the animation to play immediately, use 15840 * {@link #startAnimation(android.view.animation.Animation)} instead. 15841 * This method provides allows fine-grained 15842 * control over the start time and invalidation, but you 15843 * must make sure that 1) the animation has a start time set, and 15844 * 2) the view's parent (which controls animations on its children) 15845 * will be invalidated when the animation is supposed to 15846 * start. 15847 * 15848 * @param animation The next animation, or null. 15849 */ 15850 public void setAnimation(Animation animation) { 15851 mCurrentAnimation = animation; 15852 15853 if (animation != null) { 15854 // If the screen is off assume the animation start time is now instead of 15855 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15856 // would cause the animation to start when the screen turns back on 15857 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15858 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15859 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15860 } 15861 animation.reset(); 15862 } 15863 } 15864 15865 /** 15866 * Invoked by a parent ViewGroup to notify the start of the animation 15867 * currently associated with this view. If you override this method, 15868 * always call super.onAnimationStart(); 15869 * 15870 * @see #setAnimation(android.view.animation.Animation) 15871 * @see #getAnimation() 15872 */ 15873 protected void onAnimationStart() { 15874 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 15875 } 15876 15877 /** 15878 * Invoked by a parent ViewGroup to notify the end of the animation 15879 * currently associated with this view. If you override this method, 15880 * always call super.onAnimationEnd(); 15881 * 15882 * @see #setAnimation(android.view.animation.Animation) 15883 * @see #getAnimation() 15884 */ 15885 protected void onAnimationEnd() { 15886 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 15887 } 15888 15889 /** 15890 * Invoked if there is a Transform that involves alpha. Subclass that can 15891 * draw themselves with the specified alpha should return true, and then 15892 * respect that alpha when their onDraw() is called. If this returns false 15893 * then the view may be redirected to draw into an offscreen buffer to 15894 * fulfill the request, which will look fine, but may be slower than if the 15895 * subclass handles it internally. The default implementation returns false. 15896 * 15897 * @param alpha The alpha (0..255) to apply to the view's drawing 15898 * @return true if the view can draw with the specified alpha. 15899 */ 15900 protected boolean onSetAlpha(int alpha) { 15901 return false; 15902 } 15903 15904 /** 15905 * This is used by the RootView to perform an optimization when 15906 * the view hierarchy contains one or several SurfaceView. 15907 * SurfaceView is always considered transparent, but its children are not, 15908 * therefore all View objects remove themselves from the global transparent 15909 * region (passed as a parameter to this function). 15910 * 15911 * @param region The transparent region for this ViewAncestor (window). 15912 * 15913 * @return Returns true if the effective visibility of the view at this 15914 * point is opaque, regardless of the transparent region; returns false 15915 * if it is possible for underlying windows to be seen behind the view. 15916 * 15917 * {@hide} 15918 */ 15919 public boolean gatherTransparentRegion(Region region) { 15920 final AttachInfo attachInfo = mAttachInfo; 15921 if (region != null && attachInfo != null) { 15922 final int pflags = mPrivateFlags; 15923 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 15924 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15925 // remove it from the transparent region. 15926 final int[] location = attachInfo.mTransparentLocation; 15927 getLocationInWindow(location); 15928 region.op(location[0], location[1], location[0] + mRight - mLeft, 15929 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15930 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15931 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15932 // exists, so we remove the background drawable's non-transparent 15933 // parts from this transparent region. 15934 applyDrawableToTransparentRegion(mBackground, region); 15935 } 15936 } 15937 return true; 15938 } 15939 15940 /** 15941 * Play a sound effect for this view. 15942 * 15943 * <p>The framework will play sound effects for some built in actions, such as 15944 * clicking, but you may wish to play these effects in your widget, 15945 * for instance, for internal navigation. 15946 * 15947 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15948 * {@link #isSoundEffectsEnabled()} is true. 15949 * 15950 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15951 */ 15952 public void playSoundEffect(int soundConstant) { 15953 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15954 return; 15955 } 15956 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15957 } 15958 15959 /** 15960 * BZZZTT!!1! 15961 * 15962 * <p>Provide haptic feedback to the user for this view. 15963 * 15964 * <p>The framework will provide haptic feedback for some built in actions, 15965 * such as long presses, but you may wish to provide feedback for your 15966 * own widget. 15967 * 15968 * <p>The feedback will only be performed if 15969 * {@link #isHapticFeedbackEnabled()} is true. 15970 * 15971 * @param feedbackConstant One of the constants defined in 15972 * {@link HapticFeedbackConstants} 15973 */ 15974 public boolean performHapticFeedback(int feedbackConstant) { 15975 return performHapticFeedback(feedbackConstant, 0); 15976 } 15977 15978 /** 15979 * BZZZTT!!1! 15980 * 15981 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15982 * 15983 * @param feedbackConstant One of the constants defined in 15984 * {@link HapticFeedbackConstants} 15985 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15986 */ 15987 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15988 if (mAttachInfo == null) { 15989 return false; 15990 } 15991 //noinspection SimplifiableIfStatement 15992 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15993 && !isHapticFeedbackEnabled()) { 15994 return false; 15995 } 15996 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15997 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15998 } 15999 16000 /** 16001 * Request that the visibility of the status bar or other screen/window 16002 * decorations be changed. 16003 * 16004 * <p>This method is used to put the over device UI into temporary modes 16005 * where the user's attention is focused more on the application content, 16006 * by dimming or hiding surrounding system affordances. This is typically 16007 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16008 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16009 * to be placed behind the action bar (and with these flags other system 16010 * affordances) so that smooth transitions between hiding and showing them 16011 * can be done. 16012 * 16013 * <p>Two representative examples of the use of system UI visibility is 16014 * implementing a content browsing application (like a magazine reader) 16015 * and a video playing application. 16016 * 16017 * <p>The first code shows a typical implementation of a View in a content 16018 * browsing application. In this implementation, the application goes 16019 * into a content-oriented mode by hiding the status bar and action bar, 16020 * and putting the navigation elements into lights out mode. The user can 16021 * then interact with content while in this mode. Such an application should 16022 * provide an easy way for the user to toggle out of the mode (such as to 16023 * check information in the status bar or access notifications). In the 16024 * implementation here, this is done simply by tapping on the content. 16025 * 16026 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16027 * content} 16028 * 16029 * <p>This second code sample shows a typical implementation of a View 16030 * in a video playing application. In this situation, while the video is 16031 * playing the application would like to go into a complete full-screen mode, 16032 * to use as much of the display as possible for the video. When in this state 16033 * the user can not interact with the application; the system intercepts 16034 * touching on the screen to pop the UI out of full screen mode. See 16035 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16036 * 16037 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16038 * content} 16039 * 16040 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16041 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16042 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16043 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16044 */ 16045 public void setSystemUiVisibility(int visibility) { 16046 if (visibility != mSystemUiVisibility) { 16047 mSystemUiVisibility = visibility; 16048 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16049 mParent.recomputeViewAttributes(this); 16050 } 16051 } 16052 } 16053 16054 /** 16055 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 16056 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16057 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16058 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16059 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16060 */ 16061 public int getSystemUiVisibility() { 16062 return mSystemUiVisibility; 16063 } 16064 16065 /** 16066 * Returns the current system UI visibility that is currently set for 16067 * the entire window. This is the combination of the 16068 * {@link #setSystemUiVisibility(int)} values supplied by all of the 16069 * views in the window. 16070 */ 16071 public int getWindowSystemUiVisibility() { 16072 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 16073 } 16074 16075 /** 16076 * Override to find out when the window's requested system UI visibility 16077 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 16078 * This is different from the callbacks recieved through 16079 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 16080 * in that this is only telling you about the local request of the window, 16081 * not the actual values applied by the system. 16082 */ 16083 public void onWindowSystemUiVisibilityChanged(int visible) { 16084 } 16085 16086 /** 16087 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 16088 * the view hierarchy. 16089 */ 16090 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 16091 onWindowSystemUiVisibilityChanged(visible); 16092 } 16093 16094 /** 16095 * Set a listener to receive callbacks when the visibility of the system bar changes. 16096 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 16097 */ 16098 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 16099 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 16100 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16101 mParent.recomputeViewAttributes(this); 16102 } 16103 } 16104 16105 /** 16106 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 16107 * the view hierarchy. 16108 */ 16109 public void dispatchSystemUiVisibilityChanged(int visibility) { 16110 ListenerInfo li = mListenerInfo; 16111 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 16112 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 16113 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 16114 } 16115 } 16116 16117 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 16118 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 16119 if (val != mSystemUiVisibility) { 16120 setSystemUiVisibility(val); 16121 return true; 16122 } 16123 return false; 16124 } 16125 16126 /** @hide */ 16127 public void setDisabledSystemUiVisibility(int flags) { 16128 if (mAttachInfo != null) { 16129 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 16130 mAttachInfo.mDisabledSystemUiVisibility = flags; 16131 if (mParent != null) { 16132 mParent.recomputeViewAttributes(this); 16133 } 16134 } 16135 } 16136 } 16137 16138 /** 16139 * Creates an image that the system displays during the drag and drop 16140 * operation. This is called a "drag shadow". The default implementation 16141 * for a DragShadowBuilder based on a View returns an image that has exactly the same 16142 * appearance as the given View. The default also positions the center of the drag shadow 16143 * directly under the touch point. If no View is provided (the constructor with no parameters 16144 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 16145 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 16146 * default is an invisible drag shadow. 16147 * <p> 16148 * You are not required to use the View you provide to the constructor as the basis of the 16149 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 16150 * anything you want as the drag shadow. 16151 * </p> 16152 * <p> 16153 * You pass a DragShadowBuilder object to the system when you start the drag. The system 16154 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 16155 * size and position of the drag shadow. It uses this data to construct a 16156 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 16157 * so that your application can draw the shadow image in the Canvas. 16158 * </p> 16159 * 16160 * <div class="special reference"> 16161 * <h3>Developer Guides</h3> 16162 * <p>For a guide to implementing drag and drop features, read the 16163 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16164 * </div> 16165 */ 16166 public static class DragShadowBuilder { 16167 private final WeakReference<View> mView; 16168 16169 /** 16170 * Constructs a shadow image builder based on a View. By default, the resulting drag 16171 * shadow will have the same appearance and dimensions as the View, with the touch point 16172 * over the center of the View. 16173 * @param view A View. Any View in scope can be used. 16174 */ 16175 public DragShadowBuilder(View view) { 16176 mView = new WeakReference<View>(view); 16177 } 16178 16179 /** 16180 * Construct a shadow builder object with no associated View. This 16181 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 16182 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 16183 * to supply the drag shadow's dimensions and appearance without 16184 * reference to any View object. If they are not overridden, then the result is an 16185 * invisible drag shadow. 16186 */ 16187 public DragShadowBuilder() { 16188 mView = new WeakReference<View>(null); 16189 } 16190 16191 /** 16192 * Returns the View object that had been passed to the 16193 * {@link #View.DragShadowBuilder(View)} 16194 * constructor. If that View parameter was {@code null} or if the 16195 * {@link #View.DragShadowBuilder()} 16196 * constructor was used to instantiate the builder object, this method will return 16197 * null. 16198 * 16199 * @return The View object associate with this builder object. 16200 */ 16201 @SuppressWarnings({"JavadocReference"}) 16202 final public View getView() { 16203 return mView.get(); 16204 } 16205 16206 /** 16207 * Provides the metrics for the shadow image. These include the dimensions of 16208 * the shadow image, and the point within that shadow that should 16209 * be centered under the touch location while dragging. 16210 * <p> 16211 * The default implementation sets the dimensions of the shadow to be the 16212 * same as the dimensions of the View itself and centers the shadow under 16213 * the touch point. 16214 * </p> 16215 * 16216 * @param shadowSize A {@link android.graphics.Point} containing the width and height 16217 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 16218 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 16219 * image. 16220 * 16221 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 16222 * shadow image that should be underneath the touch point during the drag and drop 16223 * operation. Your application must set {@link android.graphics.Point#x} to the 16224 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 16225 */ 16226 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 16227 final View view = mView.get(); 16228 if (view != null) { 16229 shadowSize.set(view.getWidth(), view.getHeight()); 16230 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 16231 } else { 16232 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 16233 } 16234 } 16235 16236 /** 16237 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 16238 * based on the dimensions it received from the 16239 * {@link #onProvideShadowMetrics(Point, Point)} callback. 16240 * 16241 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 16242 */ 16243 public void onDrawShadow(Canvas canvas) { 16244 final View view = mView.get(); 16245 if (view != null) { 16246 view.draw(canvas); 16247 } else { 16248 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 16249 } 16250 } 16251 } 16252 16253 /** 16254 * Starts a drag and drop operation. When your application calls this method, it passes a 16255 * {@link android.view.View.DragShadowBuilder} object to the system. The 16256 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 16257 * to get metrics for the drag shadow, and then calls the object's 16258 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 16259 * <p> 16260 * Once the system has the drag shadow, it begins the drag and drop operation by sending 16261 * drag events to all the View objects in your application that are currently visible. It does 16262 * this either by calling the View object's drag listener (an implementation of 16263 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 16264 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 16265 * Both are passed a {@link android.view.DragEvent} object that has a 16266 * {@link android.view.DragEvent#getAction()} value of 16267 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 16268 * </p> 16269 * <p> 16270 * Your application can invoke startDrag() on any attached View object. The View object does not 16271 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 16272 * be related to the View the user selected for dragging. 16273 * </p> 16274 * @param data A {@link android.content.ClipData} object pointing to the data to be 16275 * transferred by the drag and drop operation. 16276 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 16277 * drag shadow. 16278 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 16279 * drop operation. This Object is put into every DragEvent object sent by the system during the 16280 * current drag. 16281 * <p> 16282 * myLocalState is a lightweight mechanism for the sending information from the dragged View 16283 * to the target Views. For example, it can contain flags that differentiate between a 16284 * a copy operation and a move operation. 16285 * </p> 16286 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 16287 * so the parameter should be set to 0. 16288 * @return {@code true} if the method completes successfully, or 16289 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 16290 * do a drag, and so no drag operation is in progress. 16291 */ 16292 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 16293 Object myLocalState, int flags) { 16294 if (ViewDebug.DEBUG_DRAG) { 16295 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 16296 } 16297 boolean okay = false; 16298 16299 Point shadowSize = new Point(); 16300 Point shadowTouchPoint = new Point(); 16301 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 16302 16303 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 16304 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 16305 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 16306 } 16307 16308 if (ViewDebug.DEBUG_DRAG) { 16309 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 16310 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 16311 } 16312 Surface surface = new Surface(); 16313 try { 16314 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 16315 flags, shadowSize.x, shadowSize.y, surface); 16316 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 16317 + " surface=" + surface); 16318 if (token != null) { 16319 Canvas canvas = surface.lockCanvas(null); 16320 try { 16321 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 16322 shadowBuilder.onDrawShadow(canvas); 16323 } finally { 16324 surface.unlockCanvasAndPost(canvas); 16325 } 16326 16327 final ViewRootImpl root = getViewRootImpl(); 16328 16329 // Cache the local state object for delivery with DragEvents 16330 root.setLocalDragState(myLocalState); 16331 16332 // repurpose 'shadowSize' for the last touch point 16333 root.getLastTouchPoint(shadowSize); 16334 16335 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 16336 shadowSize.x, shadowSize.y, 16337 shadowTouchPoint.x, shadowTouchPoint.y, data); 16338 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 16339 16340 // Off and running! Release our local surface instance; the drag 16341 // shadow surface is now managed by the system process. 16342 surface.release(); 16343 } 16344 } catch (Exception e) { 16345 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 16346 surface.destroy(); 16347 } 16348 16349 return okay; 16350 } 16351 16352 /** 16353 * Handles drag events sent by the system following a call to 16354 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 16355 *<p> 16356 * When the system calls this method, it passes a 16357 * {@link android.view.DragEvent} object. A call to 16358 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 16359 * in DragEvent. The method uses these to determine what is happening in the drag and drop 16360 * operation. 16361 * @param event The {@link android.view.DragEvent} sent by the system. 16362 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 16363 * in DragEvent, indicating the type of drag event represented by this object. 16364 * @return {@code true} if the method was successful, otherwise {@code false}. 16365 * <p> 16366 * The method should return {@code true} in response to an action type of 16367 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 16368 * operation. 16369 * </p> 16370 * <p> 16371 * The method should also return {@code true} in response to an action type of 16372 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 16373 * {@code false} if it didn't. 16374 * </p> 16375 */ 16376 public boolean onDragEvent(DragEvent event) { 16377 return false; 16378 } 16379 16380 /** 16381 * Detects if this View is enabled and has a drag event listener. 16382 * If both are true, then it calls the drag event listener with the 16383 * {@link android.view.DragEvent} it received. If the drag event listener returns 16384 * {@code true}, then dispatchDragEvent() returns {@code true}. 16385 * <p> 16386 * For all other cases, the method calls the 16387 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 16388 * method and returns its result. 16389 * </p> 16390 * <p> 16391 * This ensures that a drag event is always consumed, even if the View does not have a drag 16392 * event listener. However, if the View has a listener and the listener returns true, then 16393 * onDragEvent() is not called. 16394 * </p> 16395 */ 16396 public boolean dispatchDragEvent(DragEvent event) { 16397 //noinspection SimplifiableIfStatement 16398 ListenerInfo li = mListenerInfo; 16399 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 16400 && li.mOnDragListener.onDrag(this, event)) { 16401 return true; 16402 } 16403 return onDragEvent(event); 16404 } 16405 16406 boolean canAcceptDrag() { 16407 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 16408 } 16409 16410 /** 16411 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 16412 * it is ever exposed at all. 16413 * @hide 16414 */ 16415 public void onCloseSystemDialogs(String reason) { 16416 } 16417 16418 /** 16419 * Given a Drawable whose bounds have been set to draw into this view, 16420 * update a Region being computed for 16421 * {@link #gatherTransparentRegion(android.graphics.Region)} so 16422 * that any non-transparent parts of the Drawable are removed from the 16423 * given transparent region. 16424 * 16425 * @param dr The Drawable whose transparency is to be applied to the region. 16426 * @param region A Region holding the current transparency information, 16427 * where any parts of the region that are set are considered to be 16428 * transparent. On return, this region will be modified to have the 16429 * transparency information reduced by the corresponding parts of the 16430 * Drawable that are not transparent. 16431 * {@hide} 16432 */ 16433 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 16434 if (DBG) { 16435 Log.i("View", "Getting transparent region for: " + this); 16436 } 16437 final Region r = dr.getTransparentRegion(); 16438 final Rect db = dr.getBounds(); 16439 final AttachInfo attachInfo = mAttachInfo; 16440 if (r != null && attachInfo != null) { 16441 final int w = getRight()-getLeft(); 16442 final int h = getBottom()-getTop(); 16443 if (db.left > 0) { 16444 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 16445 r.op(0, 0, db.left, h, Region.Op.UNION); 16446 } 16447 if (db.right < w) { 16448 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 16449 r.op(db.right, 0, w, h, Region.Op.UNION); 16450 } 16451 if (db.top > 0) { 16452 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 16453 r.op(0, 0, w, db.top, Region.Op.UNION); 16454 } 16455 if (db.bottom < h) { 16456 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 16457 r.op(0, db.bottom, w, h, Region.Op.UNION); 16458 } 16459 final int[] location = attachInfo.mTransparentLocation; 16460 getLocationInWindow(location); 16461 r.translate(location[0], location[1]); 16462 region.op(r, Region.Op.INTERSECT); 16463 } else { 16464 region.op(db, Region.Op.DIFFERENCE); 16465 } 16466 } 16467 16468 private void checkForLongClick(int delayOffset) { 16469 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 16470 mHasPerformedLongPress = false; 16471 16472 if (mPendingCheckForLongPress == null) { 16473 mPendingCheckForLongPress = new CheckForLongPress(); 16474 } 16475 mPendingCheckForLongPress.rememberWindowAttachCount(); 16476 postDelayed(mPendingCheckForLongPress, 16477 ViewConfiguration.getLongPressTimeout() - delayOffset); 16478 } 16479 } 16480 16481 /** 16482 * Inflate a view from an XML resource. This convenience method wraps the {@link 16483 * LayoutInflater} class, which provides a full range of options for view inflation. 16484 * 16485 * @param context The Context object for your activity or application. 16486 * @param resource The resource ID to inflate 16487 * @param root A view group that will be the parent. Used to properly inflate the 16488 * layout_* parameters. 16489 * @see LayoutInflater 16490 */ 16491 public static View inflate(Context context, int resource, ViewGroup root) { 16492 LayoutInflater factory = LayoutInflater.from(context); 16493 return factory.inflate(resource, root); 16494 } 16495 16496 /** 16497 * Scroll the view with standard behavior for scrolling beyond the normal 16498 * content boundaries. Views that call this method should override 16499 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 16500 * results of an over-scroll operation. 16501 * 16502 * Views can use this method to handle any touch or fling-based scrolling. 16503 * 16504 * @param deltaX Change in X in pixels 16505 * @param deltaY Change in Y in pixels 16506 * @param scrollX Current X scroll value in pixels before applying deltaX 16507 * @param scrollY Current Y scroll value in pixels before applying deltaY 16508 * @param scrollRangeX Maximum content scroll range along the X axis 16509 * @param scrollRangeY Maximum content scroll range along the Y axis 16510 * @param maxOverScrollX Number of pixels to overscroll by in either direction 16511 * along the X axis. 16512 * @param maxOverScrollY Number of pixels to overscroll by in either direction 16513 * along the Y axis. 16514 * @param isTouchEvent true if this scroll operation is the result of a touch event. 16515 * @return true if scrolling was clamped to an over-scroll boundary along either 16516 * axis, false otherwise. 16517 */ 16518 @SuppressWarnings({"UnusedParameters"}) 16519 protected boolean overScrollBy(int deltaX, int deltaY, 16520 int scrollX, int scrollY, 16521 int scrollRangeX, int scrollRangeY, 16522 int maxOverScrollX, int maxOverScrollY, 16523 boolean isTouchEvent) { 16524 final int overScrollMode = mOverScrollMode; 16525 final boolean canScrollHorizontal = 16526 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 16527 final boolean canScrollVertical = 16528 computeVerticalScrollRange() > computeVerticalScrollExtent(); 16529 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 16530 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 16531 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 16532 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 16533 16534 int newScrollX = scrollX + deltaX; 16535 if (!overScrollHorizontal) { 16536 maxOverScrollX = 0; 16537 } 16538 16539 int newScrollY = scrollY + deltaY; 16540 if (!overScrollVertical) { 16541 maxOverScrollY = 0; 16542 } 16543 16544 // Clamp values if at the limits and record 16545 final int left = -maxOverScrollX; 16546 final int right = maxOverScrollX + scrollRangeX; 16547 final int top = -maxOverScrollY; 16548 final int bottom = maxOverScrollY + scrollRangeY; 16549 16550 boolean clampedX = false; 16551 if (newScrollX > right) { 16552 newScrollX = right; 16553 clampedX = true; 16554 } else if (newScrollX < left) { 16555 newScrollX = left; 16556 clampedX = true; 16557 } 16558 16559 boolean clampedY = false; 16560 if (newScrollY > bottom) { 16561 newScrollY = bottom; 16562 clampedY = true; 16563 } else if (newScrollY < top) { 16564 newScrollY = top; 16565 clampedY = true; 16566 } 16567 16568 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16569 16570 return clampedX || clampedY; 16571 } 16572 16573 /** 16574 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16575 * respond to the results of an over-scroll operation. 16576 * 16577 * @param scrollX New X scroll value in pixels 16578 * @param scrollY New Y scroll value in pixels 16579 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16580 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16581 */ 16582 protected void onOverScrolled(int scrollX, int scrollY, 16583 boolean clampedX, boolean clampedY) { 16584 // Intentionally empty. 16585 } 16586 16587 /** 16588 * Returns the over-scroll mode for this view. The result will be 16589 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16590 * (allow over-scrolling only if the view content is larger than the container), 16591 * or {@link #OVER_SCROLL_NEVER}. 16592 * 16593 * @return This view's over-scroll mode. 16594 */ 16595 public int getOverScrollMode() { 16596 return mOverScrollMode; 16597 } 16598 16599 /** 16600 * Set the over-scroll mode for this view. Valid over-scroll modes are 16601 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16602 * (allow over-scrolling only if the view content is larger than the container), 16603 * or {@link #OVER_SCROLL_NEVER}. 16604 * 16605 * Setting the over-scroll mode of a view will have an effect only if the 16606 * view is capable of scrolling. 16607 * 16608 * @param overScrollMode The new over-scroll mode for this view. 16609 */ 16610 public void setOverScrollMode(int overScrollMode) { 16611 if (overScrollMode != OVER_SCROLL_ALWAYS && 16612 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16613 overScrollMode != OVER_SCROLL_NEVER) { 16614 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16615 } 16616 mOverScrollMode = overScrollMode; 16617 } 16618 16619 /** 16620 * Gets a scale factor that determines the distance the view should scroll 16621 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16622 * @return The vertical scroll scale factor. 16623 * @hide 16624 */ 16625 protected float getVerticalScrollFactor() { 16626 if (mVerticalScrollFactor == 0) { 16627 TypedValue outValue = new TypedValue(); 16628 if (!mContext.getTheme().resolveAttribute( 16629 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16630 throw new IllegalStateException( 16631 "Expected theme to define listPreferredItemHeight."); 16632 } 16633 mVerticalScrollFactor = outValue.getDimension( 16634 mContext.getResources().getDisplayMetrics()); 16635 } 16636 return mVerticalScrollFactor; 16637 } 16638 16639 /** 16640 * Gets a scale factor that determines the distance the view should scroll 16641 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16642 * @return The horizontal scroll scale factor. 16643 * @hide 16644 */ 16645 protected float getHorizontalScrollFactor() { 16646 // TODO: Should use something else. 16647 return getVerticalScrollFactor(); 16648 } 16649 16650 /** 16651 * Return the value specifying the text direction or policy that was set with 16652 * {@link #setTextDirection(int)}. 16653 * 16654 * @return the defined text direction. It can be one of: 16655 * 16656 * {@link #TEXT_DIRECTION_INHERIT}, 16657 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16658 * {@link #TEXT_DIRECTION_ANY_RTL}, 16659 * {@link #TEXT_DIRECTION_LTR}, 16660 * {@link #TEXT_DIRECTION_RTL}, 16661 * {@link #TEXT_DIRECTION_LOCALE} 16662 * 16663 * @hide 16664 */ 16665 @ViewDebug.ExportedProperty(category = "text", mapping = { 16666 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16667 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16668 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16669 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16670 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16671 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16672 }) 16673 public int getRawTextDirection() { 16674 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 16675 } 16676 16677 /** 16678 * Set the text direction. 16679 * 16680 * @param textDirection the direction to set. Should be one of: 16681 * 16682 * {@link #TEXT_DIRECTION_INHERIT}, 16683 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16684 * {@link #TEXT_DIRECTION_ANY_RTL}, 16685 * {@link #TEXT_DIRECTION_LTR}, 16686 * {@link #TEXT_DIRECTION_RTL}, 16687 * {@link #TEXT_DIRECTION_LOCALE} 16688 * 16689 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 16690 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 16691 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 16692 */ 16693 public void setTextDirection(int textDirection) { 16694 if (getRawTextDirection() != textDirection) { 16695 // Reset the current text direction and the resolved one 16696 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 16697 resetResolvedTextDirection(); 16698 // Set the new text direction 16699 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 16700 // Do resolution 16701 resolveTextDirection(); 16702 // Notify change 16703 onRtlPropertiesChanged(getLayoutDirection()); 16704 // Refresh 16705 requestLayout(); 16706 invalidate(true); 16707 } 16708 } 16709 16710 /** 16711 * Return the resolved text direction. 16712 * 16713 * @return the resolved text direction. Returns one of: 16714 * 16715 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16716 * {@link #TEXT_DIRECTION_ANY_RTL}, 16717 * {@link #TEXT_DIRECTION_LTR}, 16718 * {@link #TEXT_DIRECTION_RTL}, 16719 * {@link #TEXT_DIRECTION_LOCALE} 16720 */ 16721 public int getTextDirection() { 16722 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16723 } 16724 16725 /** 16726 * Resolve the text direction. 16727 * 16728 * @return true if resolution has been done, false otherwise. 16729 * 16730 * @hide 16731 */ 16732 public boolean resolveTextDirection() { 16733 // Reset any previous text direction resolution 16734 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 16735 16736 if (hasRtlSupport()) { 16737 // Set resolved text direction flag depending on text direction flag 16738 final int textDirection = getRawTextDirection(); 16739 switch(textDirection) { 16740 case TEXT_DIRECTION_INHERIT: 16741 if (!canResolveTextDirection()) { 16742 // We cannot do the resolution if there is no parent, so use the default one 16743 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16744 // Resolution will need to happen again later 16745 return false; 16746 } 16747 16748 View parent = ((View) mParent); 16749 // Parent has not yet resolved, so we still return the default 16750 if (!parent.isTextDirectionResolved()) { 16751 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16752 // Resolution will need to happen again later 16753 return false; 16754 } 16755 16756 // Set current resolved direction to the same value as the parent's one 16757 final int parentResolvedDirection = parent.getTextDirection(); 16758 switch (parentResolvedDirection) { 16759 case TEXT_DIRECTION_FIRST_STRONG: 16760 case TEXT_DIRECTION_ANY_RTL: 16761 case TEXT_DIRECTION_LTR: 16762 case TEXT_DIRECTION_RTL: 16763 case TEXT_DIRECTION_LOCALE: 16764 mPrivateFlags2 |= 16765 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16766 break; 16767 default: 16768 // Default resolved direction is "first strong" heuristic 16769 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16770 } 16771 break; 16772 case TEXT_DIRECTION_FIRST_STRONG: 16773 case TEXT_DIRECTION_ANY_RTL: 16774 case TEXT_DIRECTION_LTR: 16775 case TEXT_DIRECTION_RTL: 16776 case TEXT_DIRECTION_LOCALE: 16777 // Resolved direction is the same as text direction 16778 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16779 break; 16780 default: 16781 // Default resolved direction is "first strong" heuristic 16782 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16783 } 16784 } else { 16785 // Default resolved direction is "first strong" heuristic 16786 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16787 } 16788 16789 // Set to resolved 16790 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 16791 return true; 16792 } 16793 16794 /** 16795 * Check if text direction resolution can be done. 16796 * 16797 * @return true if text direction resolution can be done otherwise return false. 16798 */ 16799 private boolean canResolveTextDirection() { 16800 switch (getRawTextDirection()) { 16801 case TEXT_DIRECTION_INHERIT: 16802 return (mParent != null) && (mParent instanceof View) && 16803 ((View) mParent).canResolveTextDirection(); 16804 default: 16805 return true; 16806 } 16807 } 16808 16809 /** 16810 * Reset resolved text direction. Text direction will be resolved during a call to 16811 * {@link #onMeasure(int, int)}. 16812 * 16813 * @hide 16814 */ 16815 public void resetResolvedTextDirection() { 16816 // Reset any previous text direction resolution 16817 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 16818 // Set to default value 16819 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 16820 } 16821 16822 /** 16823 * @return true if text direction is inherited. 16824 * 16825 * @hide 16826 */ 16827 public boolean isTextDirectionInherited() { 16828 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 16829 } 16830 16831 /** 16832 * @return true if text direction is resolved. 16833 */ 16834 private boolean isTextDirectionResolved() { 16835 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 16836 } 16837 16838 /** 16839 * Return the value specifying the text alignment or policy that was set with 16840 * {@link #setTextAlignment(int)}. 16841 * 16842 * @return the defined text alignment. It can be one of: 16843 * 16844 * {@link #TEXT_ALIGNMENT_INHERIT}, 16845 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16846 * {@link #TEXT_ALIGNMENT_CENTER}, 16847 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16848 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16849 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16850 * {@link #TEXT_ALIGNMENT_VIEW_END} 16851 * 16852 * @hide 16853 */ 16854 @ViewDebug.ExportedProperty(category = "text", mapping = { 16855 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16856 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16857 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16858 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16859 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16860 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16861 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16862 }) 16863 public int getRawTextAlignment() { 16864 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 16865 } 16866 16867 /** 16868 * Set the text alignment. 16869 * 16870 * @param textAlignment The text alignment to set. Should be one of 16871 * 16872 * {@link #TEXT_ALIGNMENT_INHERIT}, 16873 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16874 * {@link #TEXT_ALIGNMENT_CENTER}, 16875 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16876 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16877 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16878 * {@link #TEXT_ALIGNMENT_VIEW_END} 16879 * 16880 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 16881 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 16882 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 16883 * 16884 * @attr ref android.R.styleable#View_textAlignment 16885 */ 16886 public void setTextAlignment(int textAlignment) { 16887 if (textAlignment != getRawTextAlignment()) { 16888 // Reset the current and resolved text alignment 16889 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 16890 resetResolvedTextAlignment(); 16891 // Set the new text alignment 16892 mPrivateFlags2 |= 16893 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 16894 // Do resolution 16895 resolveTextAlignment(); 16896 // Notify change 16897 onRtlPropertiesChanged(getLayoutDirection()); 16898 // Refresh 16899 requestLayout(); 16900 invalidate(true); 16901 } 16902 } 16903 16904 /** 16905 * Return the resolved text alignment. 16906 * 16907 * @return the resolved text alignment. Returns one of: 16908 * 16909 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16910 * {@link #TEXT_ALIGNMENT_CENTER}, 16911 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16912 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16913 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16914 * {@link #TEXT_ALIGNMENT_VIEW_END} 16915 */ 16916 @ViewDebug.ExportedProperty(category = "text", mapping = { 16917 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16918 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16919 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16920 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16921 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16922 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16923 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16924 }) 16925 public int getTextAlignment() { 16926 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 16927 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16928 } 16929 16930 /** 16931 * Resolve the text alignment. 16932 * 16933 * @return true if resolution has been done, false otherwise. 16934 * 16935 * @hide 16936 */ 16937 public boolean resolveTextAlignment() { 16938 // Reset any previous text alignment resolution 16939 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 16940 16941 if (hasRtlSupport()) { 16942 // Set resolved text alignment flag depending on text alignment flag 16943 final int textAlignment = getRawTextAlignment(); 16944 switch (textAlignment) { 16945 case TEXT_ALIGNMENT_INHERIT: 16946 // Check if we can resolve the text alignment 16947 if (!canResolveTextAlignment()) { 16948 // We cannot do the resolution if there is no parent so use the default 16949 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16950 // Resolution will need to happen again later 16951 return false; 16952 } 16953 View parent = (View) mParent; 16954 16955 // Parent has not yet resolved, so we still return the default 16956 if (!parent.isTextAlignmentResolved()) { 16957 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16958 // Resolution will need to happen again later 16959 return false; 16960 } 16961 16962 final int parentResolvedTextAlignment = parent.getTextAlignment(); 16963 switch (parentResolvedTextAlignment) { 16964 case TEXT_ALIGNMENT_GRAVITY: 16965 case TEXT_ALIGNMENT_TEXT_START: 16966 case TEXT_ALIGNMENT_TEXT_END: 16967 case TEXT_ALIGNMENT_CENTER: 16968 case TEXT_ALIGNMENT_VIEW_START: 16969 case TEXT_ALIGNMENT_VIEW_END: 16970 // Resolved text alignment is the same as the parent resolved 16971 // text alignment 16972 mPrivateFlags2 |= 16973 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16974 break; 16975 default: 16976 // Use default resolved text alignment 16977 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16978 } 16979 break; 16980 case TEXT_ALIGNMENT_GRAVITY: 16981 case TEXT_ALIGNMENT_TEXT_START: 16982 case TEXT_ALIGNMENT_TEXT_END: 16983 case TEXT_ALIGNMENT_CENTER: 16984 case TEXT_ALIGNMENT_VIEW_START: 16985 case TEXT_ALIGNMENT_VIEW_END: 16986 // Resolved text alignment is the same as text alignment 16987 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16988 break; 16989 default: 16990 // Use default resolved text alignment 16991 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16992 } 16993 } else { 16994 // Use default resolved text alignment 16995 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16996 } 16997 16998 // Set the resolved 16999 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17000 return true; 17001 } 17002 17003 /** 17004 * Check if text alignment resolution can be done. 17005 * 17006 * @return true if text alignment resolution can be done otherwise return false. 17007 */ 17008 private boolean canResolveTextAlignment() { 17009 switch (getRawTextAlignment()) { 17010 case TEXT_DIRECTION_INHERIT: 17011 return (mParent != null) && (mParent instanceof View) && 17012 ((View) mParent).canResolveTextAlignment(); 17013 default: 17014 return true; 17015 } 17016 } 17017 17018 /** 17019 * Reset resolved text alignment. Text alignment will be resolved during a call to 17020 * {@link #onMeasure(int, int)}. 17021 * 17022 * @hide 17023 */ 17024 public void resetResolvedTextAlignment() { 17025 // Reset any previous text alignment resolution 17026 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17027 // Set to default 17028 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17029 } 17030 17031 /** 17032 * @return true if text alignment is inherited. 17033 * 17034 * @hide 17035 */ 17036 public boolean isTextAlignmentInherited() { 17037 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 17038 } 17039 17040 /** 17041 * @return true if text alignment is resolved. 17042 */ 17043 private boolean isTextAlignmentResolved() { 17044 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17045 } 17046 17047 /** 17048 * Generate a value suitable for use in {@link #setId(int)}. 17049 * This value will not collide with ID values generated at build time by aapt for R.id. 17050 * 17051 * @return a generated ID value 17052 */ 17053 public static int generateViewId() { 17054 for (;;) { 17055 final int result = sNextGeneratedId.get(); 17056 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 17057 int newValue = result + 1; 17058 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 17059 if (sNextGeneratedId.compareAndSet(result, newValue)) { 17060 return result; 17061 } 17062 } 17063 } 17064 17065 // 17066 // Properties 17067 // 17068 /** 17069 * A Property wrapper around the <code>alpha</code> functionality handled by the 17070 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 17071 */ 17072 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 17073 @Override 17074 public void setValue(View object, float value) { 17075 object.setAlpha(value); 17076 } 17077 17078 @Override 17079 public Float get(View object) { 17080 return object.getAlpha(); 17081 } 17082 }; 17083 17084 /** 17085 * A Property wrapper around the <code>translationX</code> functionality handled by the 17086 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 17087 */ 17088 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 17089 @Override 17090 public void setValue(View object, float value) { 17091 object.setTranslationX(value); 17092 } 17093 17094 @Override 17095 public Float get(View object) { 17096 return object.getTranslationX(); 17097 } 17098 }; 17099 17100 /** 17101 * A Property wrapper around the <code>translationY</code> functionality handled by the 17102 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 17103 */ 17104 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 17105 @Override 17106 public void setValue(View object, float value) { 17107 object.setTranslationY(value); 17108 } 17109 17110 @Override 17111 public Float get(View object) { 17112 return object.getTranslationY(); 17113 } 17114 }; 17115 17116 /** 17117 * A Property wrapper around the <code>x</code> functionality handled by the 17118 * {@link View#setX(float)} and {@link View#getX()} methods. 17119 */ 17120 public static final Property<View, Float> X = new FloatProperty<View>("x") { 17121 @Override 17122 public void setValue(View object, float value) { 17123 object.setX(value); 17124 } 17125 17126 @Override 17127 public Float get(View object) { 17128 return object.getX(); 17129 } 17130 }; 17131 17132 /** 17133 * A Property wrapper around the <code>y</code> functionality handled by the 17134 * {@link View#setY(float)} and {@link View#getY()} methods. 17135 */ 17136 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 17137 @Override 17138 public void setValue(View object, float value) { 17139 object.setY(value); 17140 } 17141 17142 @Override 17143 public Float get(View object) { 17144 return object.getY(); 17145 } 17146 }; 17147 17148 /** 17149 * A Property wrapper around the <code>rotation</code> functionality handled by the 17150 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 17151 */ 17152 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 17153 @Override 17154 public void setValue(View object, float value) { 17155 object.setRotation(value); 17156 } 17157 17158 @Override 17159 public Float get(View object) { 17160 return object.getRotation(); 17161 } 17162 }; 17163 17164 /** 17165 * A Property wrapper around the <code>rotationX</code> functionality handled by the 17166 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 17167 */ 17168 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 17169 @Override 17170 public void setValue(View object, float value) { 17171 object.setRotationX(value); 17172 } 17173 17174 @Override 17175 public Float get(View object) { 17176 return object.getRotationX(); 17177 } 17178 }; 17179 17180 /** 17181 * A Property wrapper around the <code>rotationY</code> functionality handled by the 17182 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 17183 */ 17184 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 17185 @Override 17186 public void setValue(View object, float value) { 17187 object.setRotationY(value); 17188 } 17189 17190 @Override 17191 public Float get(View object) { 17192 return object.getRotationY(); 17193 } 17194 }; 17195 17196 /** 17197 * A Property wrapper around the <code>scaleX</code> functionality handled by the 17198 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 17199 */ 17200 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 17201 @Override 17202 public void setValue(View object, float value) { 17203 object.setScaleX(value); 17204 } 17205 17206 @Override 17207 public Float get(View object) { 17208 return object.getScaleX(); 17209 } 17210 }; 17211 17212 /** 17213 * A Property wrapper around the <code>scaleY</code> functionality handled by the 17214 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 17215 */ 17216 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 17217 @Override 17218 public void setValue(View object, float value) { 17219 object.setScaleY(value); 17220 } 17221 17222 @Override 17223 public Float get(View object) { 17224 return object.getScaleY(); 17225 } 17226 }; 17227 17228 /** 17229 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 17230 * Each MeasureSpec represents a requirement for either the width or the height. 17231 * A MeasureSpec is comprised of a size and a mode. There are three possible 17232 * modes: 17233 * <dl> 17234 * <dt>UNSPECIFIED</dt> 17235 * <dd> 17236 * The parent has not imposed any constraint on the child. It can be whatever size 17237 * it wants. 17238 * </dd> 17239 * 17240 * <dt>EXACTLY</dt> 17241 * <dd> 17242 * The parent has determined an exact size for the child. The child is going to be 17243 * given those bounds regardless of how big it wants to be. 17244 * </dd> 17245 * 17246 * <dt>AT_MOST</dt> 17247 * <dd> 17248 * The child can be as large as it wants up to the specified size. 17249 * </dd> 17250 * </dl> 17251 * 17252 * MeasureSpecs are implemented as ints to reduce object allocation. This class 17253 * is provided to pack and unpack the <size, mode> tuple into the int. 17254 */ 17255 public static class MeasureSpec { 17256 private static final int MODE_SHIFT = 30; 17257 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 17258 17259 /** 17260 * Measure specification mode: The parent has not imposed any constraint 17261 * on the child. It can be whatever size it wants. 17262 */ 17263 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 17264 17265 /** 17266 * Measure specification mode: The parent has determined an exact size 17267 * for the child. The child is going to be given those bounds regardless 17268 * of how big it wants to be. 17269 */ 17270 public static final int EXACTLY = 1 << MODE_SHIFT; 17271 17272 /** 17273 * Measure specification mode: The child can be as large as it wants up 17274 * to the specified size. 17275 */ 17276 public static final int AT_MOST = 2 << MODE_SHIFT; 17277 17278 /** 17279 * Creates a measure specification based on the supplied size and mode. 17280 * 17281 * The mode must always be one of the following: 17282 * <ul> 17283 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 17284 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 17285 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 17286 * </ul> 17287 * 17288 * @param size the size of the measure specification 17289 * @param mode the mode of the measure specification 17290 * @return the measure specification based on size and mode 17291 */ 17292 public static int makeMeasureSpec(int size, int mode) { 17293 return (size & ~MODE_MASK) | (mode & MODE_MASK); 17294 } 17295 17296 /** 17297 * Extracts the mode from the supplied measure specification. 17298 * 17299 * @param measureSpec the measure specification to extract the mode from 17300 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 17301 * {@link android.view.View.MeasureSpec#AT_MOST} or 17302 * {@link android.view.View.MeasureSpec#EXACTLY} 17303 */ 17304 public static int getMode(int measureSpec) { 17305 return (measureSpec & MODE_MASK); 17306 } 17307 17308 /** 17309 * Extracts the size from the supplied measure specification. 17310 * 17311 * @param measureSpec the measure specification to extract the size from 17312 * @return the size in pixels defined in the supplied measure specification 17313 */ 17314 public static int getSize(int measureSpec) { 17315 return (measureSpec & ~MODE_MASK); 17316 } 17317 17318 static int adjust(int measureSpec, int delta) { 17319 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 17320 } 17321 17322 /** 17323 * Returns a String representation of the specified measure 17324 * specification. 17325 * 17326 * @param measureSpec the measure specification to convert to a String 17327 * @return a String with the following format: "MeasureSpec: MODE SIZE" 17328 */ 17329 public static String toString(int measureSpec) { 17330 int mode = getMode(measureSpec); 17331 int size = getSize(measureSpec); 17332 17333 StringBuilder sb = new StringBuilder("MeasureSpec: "); 17334 17335 if (mode == UNSPECIFIED) 17336 sb.append("UNSPECIFIED "); 17337 else if (mode == EXACTLY) 17338 sb.append("EXACTLY "); 17339 else if (mode == AT_MOST) 17340 sb.append("AT_MOST "); 17341 else 17342 sb.append(mode).append(" "); 17343 17344 sb.append(size); 17345 return sb.toString(); 17346 } 17347 } 17348 17349 class CheckForLongPress implements Runnable { 17350 17351 private int mOriginalWindowAttachCount; 17352 17353 public void run() { 17354 if (isPressed() && (mParent != null) 17355 && mOriginalWindowAttachCount == mWindowAttachCount) { 17356 if (performLongClick()) { 17357 mHasPerformedLongPress = true; 17358 } 17359 } 17360 } 17361 17362 public void rememberWindowAttachCount() { 17363 mOriginalWindowAttachCount = mWindowAttachCount; 17364 } 17365 } 17366 17367 private final class CheckForTap implements Runnable { 17368 public void run() { 17369 mPrivateFlags &= ~PFLAG_PREPRESSED; 17370 setPressed(true); 17371 checkForLongClick(ViewConfiguration.getTapTimeout()); 17372 } 17373 } 17374 17375 private final class PerformClick implements Runnable { 17376 public void run() { 17377 performClick(); 17378 } 17379 } 17380 17381 /** @hide */ 17382 public void hackTurnOffWindowResizeAnim(boolean off) { 17383 mAttachInfo.mTurnOffWindowResizeAnim = off; 17384 } 17385 17386 /** 17387 * This method returns a ViewPropertyAnimator object, which can be used to animate 17388 * specific properties on this View. 17389 * 17390 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 17391 */ 17392 public ViewPropertyAnimator animate() { 17393 if (mAnimator == null) { 17394 mAnimator = new ViewPropertyAnimator(this); 17395 } 17396 return mAnimator; 17397 } 17398 17399 /** 17400 * Interface definition for a callback to be invoked when a hardware key event is 17401 * dispatched to this view. The callback will be invoked before the key event is 17402 * given to the view. This is only useful for hardware keyboards; a software input 17403 * method has no obligation to trigger this listener. 17404 */ 17405 public interface OnKeyListener { 17406 /** 17407 * Called when a hardware key is dispatched to a view. This allows listeners to 17408 * get a chance to respond before the target view. 17409 * <p>Key presses in software keyboards will generally NOT trigger this method, 17410 * although some may elect to do so in some situations. Do not assume a 17411 * software input method has to be key-based; even if it is, it may use key presses 17412 * in a different way than you expect, so there is no way to reliably catch soft 17413 * input key presses. 17414 * 17415 * @param v The view the key has been dispatched to. 17416 * @param keyCode The code for the physical key that was pressed 17417 * @param event The KeyEvent object containing full information about 17418 * the event. 17419 * @return True if the listener has consumed the event, false otherwise. 17420 */ 17421 boolean onKey(View v, int keyCode, KeyEvent event); 17422 } 17423 17424 /** 17425 * Interface definition for a callback to be invoked when a touch event is 17426 * dispatched to this view. The callback will be invoked before the touch 17427 * event is given to the view. 17428 */ 17429 public interface OnTouchListener { 17430 /** 17431 * Called when a touch event is dispatched to a view. This allows listeners to 17432 * get a chance to respond before the target view. 17433 * 17434 * @param v The view the touch event has been dispatched to. 17435 * @param event The MotionEvent object containing full information about 17436 * the event. 17437 * @return True if the listener has consumed the event, false otherwise. 17438 */ 17439 boolean onTouch(View v, MotionEvent event); 17440 } 17441 17442 /** 17443 * Interface definition for a callback to be invoked when a hover event is 17444 * dispatched to this view. The callback will be invoked before the hover 17445 * event is given to the view. 17446 */ 17447 public interface OnHoverListener { 17448 /** 17449 * Called when a hover event is dispatched to a view. This allows listeners to 17450 * get a chance to respond before the target view. 17451 * 17452 * @param v The view the hover event has been dispatched to. 17453 * @param event The MotionEvent object containing full information about 17454 * the event. 17455 * @return True if the listener has consumed the event, false otherwise. 17456 */ 17457 boolean onHover(View v, MotionEvent event); 17458 } 17459 17460 /** 17461 * Interface definition for a callback to be invoked when a generic motion event is 17462 * dispatched to this view. The callback will be invoked before the generic motion 17463 * event is given to the view. 17464 */ 17465 public interface OnGenericMotionListener { 17466 /** 17467 * Called when a generic motion event is dispatched to a view. This allows listeners to 17468 * get a chance to respond before the target view. 17469 * 17470 * @param v The view the generic motion event has been dispatched to. 17471 * @param event The MotionEvent object containing full information about 17472 * the event. 17473 * @return True if the listener has consumed the event, false otherwise. 17474 */ 17475 boolean onGenericMotion(View v, MotionEvent event); 17476 } 17477 17478 /** 17479 * Interface definition for a callback to be invoked when a view has been clicked and held. 17480 */ 17481 public interface OnLongClickListener { 17482 /** 17483 * Called when a view has been clicked and held. 17484 * 17485 * @param v The view that was clicked and held. 17486 * 17487 * @return true if the callback consumed the long click, false otherwise. 17488 */ 17489 boolean onLongClick(View v); 17490 } 17491 17492 /** 17493 * Interface definition for a callback to be invoked when a drag is being dispatched 17494 * to this view. The callback will be invoked before the hosting view's own 17495 * onDrag(event) method. If the listener wants to fall back to the hosting view's 17496 * onDrag(event) behavior, it should return 'false' from this callback. 17497 * 17498 * <div class="special reference"> 17499 * <h3>Developer Guides</h3> 17500 * <p>For a guide to implementing drag and drop features, read the 17501 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 17502 * </div> 17503 */ 17504 public interface OnDragListener { 17505 /** 17506 * Called when a drag event is dispatched to a view. This allows listeners 17507 * to get a chance to override base View behavior. 17508 * 17509 * @param v The View that received the drag event. 17510 * @param event The {@link android.view.DragEvent} object for the drag event. 17511 * @return {@code true} if the drag event was handled successfully, or {@code false} 17512 * if the drag event was not handled. Note that {@code false} will trigger the View 17513 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 17514 */ 17515 boolean onDrag(View v, DragEvent event); 17516 } 17517 17518 /** 17519 * Interface definition for a callback to be invoked when the focus state of 17520 * a view changed. 17521 */ 17522 public interface OnFocusChangeListener { 17523 /** 17524 * Called when the focus state of a view has changed. 17525 * 17526 * @param v The view whose state has changed. 17527 * @param hasFocus The new focus state of v. 17528 */ 17529 void onFocusChange(View v, boolean hasFocus); 17530 } 17531 17532 /** 17533 * Interface definition for a callback to be invoked when a view is clicked. 17534 */ 17535 public interface OnClickListener { 17536 /** 17537 * Called when a view has been clicked. 17538 * 17539 * @param v The view that was clicked. 17540 */ 17541 void onClick(View v); 17542 } 17543 17544 /** 17545 * Interface definition for a callback to be invoked when the context menu 17546 * for this view is being built. 17547 */ 17548 public interface OnCreateContextMenuListener { 17549 /** 17550 * Called when the context menu for this view is being built. It is not 17551 * safe to hold onto the menu after this method returns. 17552 * 17553 * @param menu The context menu that is being built 17554 * @param v The view for which the context menu is being built 17555 * @param menuInfo Extra information about the item for which the 17556 * context menu should be shown. This information will vary 17557 * depending on the class of v. 17558 */ 17559 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 17560 } 17561 17562 /** 17563 * Interface definition for a callback to be invoked when the status bar changes 17564 * visibility. This reports <strong>global</strong> changes to the system UI 17565 * state, not what the application is requesting. 17566 * 17567 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 17568 */ 17569 public interface OnSystemUiVisibilityChangeListener { 17570 /** 17571 * Called when the status bar changes visibility because of a call to 17572 * {@link View#setSystemUiVisibility(int)}. 17573 * 17574 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 17575 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 17576 * This tells you the <strong>global</strong> state of these UI visibility 17577 * flags, not what your app is currently applying. 17578 */ 17579 public void onSystemUiVisibilityChange(int visibility); 17580 } 17581 17582 /** 17583 * Interface definition for a callback to be invoked when this view is attached 17584 * or detached from its window. 17585 */ 17586 public interface OnAttachStateChangeListener { 17587 /** 17588 * Called when the view is attached to a window. 17589 * @param v The view that was attached 17590 */ 17591 public void onViewAttachedToWindow(View v); 17592 /** 17593 * Called when the view is detached from a window. 17594 * @param v The view that was detached 17595 */ 17596 public void onViewDetachedFromWindow(View v); 17597 } 17598 17599 private final class UnsetPressedState implements Runnable { 17600 public void run() { 17601 setPressed(false); 17602 } 17603 } 17604 17605 /** 17606 * Base class for derived classes that want to save and restore their own 17607 * state in {@link android.view.View#onSaveInstanceState()}. 17608 */ 17609 public static class BaseSavedState extends AbsSavedState { 17610 /** 17611 * Constructor used when reading from a parcel. Reads the state of the superclass. 17612 * 17613 * @param source 17614 */ 17615 public BaseSavedState(Parcel source) { 17616 super(source); 17617 } 17618 17619 /** 17620 * Constructor called by derived classes when creating their SavedState objects 17621 * 17622 * @param superState The state of the superclass of this view 17623 */ 17624 public BaseSavedState(Parcelable superState) { 17625 super(superState); 17626 } 17627 17628 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17629 new Parcelable.Creator<BaseSavedState>() { 17630 public BaseSavedState createFromParcel(Parcel in) { 17631 return new BaseSavedState(in); 17632 } 17633 17634 public BaseSavedState[] newArray(int size) { 17635 return new BaseSavedState[size]; 17636 } 17637 }; 17638 } 17639 17640 /** 17641 * A set of information given to a view when it is attached to its parent 17642 * window. 17643 */ 17644 static class AttachInfo { 17645 interface Callbacks { 17646 void playSoundEffect(int effectId); 17647 boolean performHapticFeedback(int effectId, boolean always); 17648 } 17649 17650 /** 17651 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17652 * to a Handler. This class contains the target (View) to invalidate and 17653 * the coordinates of the dirty rectangle. 17654 * 17655 * For performance purposes, this class also implements a pool of up to 17656 * POOL_LIMIT objects that get reused. This reduces memory allocations 17657 * whenever possible. 17658 */ 17659 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17660 private static final int POOL_LIMIT = 10; 17661 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17662 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17663 public InvalidateInfo newInstance() { 17664 return new InvalidateInfo(); 17665 } 17666 17667 public void onAcquired(InvalidateInfo element) { 17668 } 17669 17670 public void onReleased(InvalidateInfo element) { 17671 element.target = null; 17672 } 17673 }, POOL_LIMIT) 17674 ); 17675 17676 private InvalidateInfo mNext; 17677 private boolean mIsPooled; 17678 17679 View target; 17680 17681 int left; 17682 int top; 17683 int right; 17684 int bottom; 17685 17686 public void setNextPoolable(InvalidateInfo element) { 17687 mNext = element; 17688 } 17689 17690 public InvalidateInfo getNextPoolable() { 17691 return mNext; 17692 } 17693 17694 static InvalidateInfo acquire() { 17695 return sPool.acquire(); 17696 } 17697 17698 void release() { 17699 sPool.release(this); 17700 } 17701 17702 public boolean isPooled() { 17703 return mIsPooled; 17704 } 17705 17706 public void setPooled(boolean isPooled) { 17707 mIsPooled = isPooled; 17708 } 17709 } 17710 17711 final IWindowSession mSession; 17712 17713 final IWindow mWindow; 17714 17715 final IBinder mWindowToken; 17716 17717 final Display mDisplay; 17718 17719 final Callbacks mRootCallbacks; 17720 17721 HardwareCanvas mHardwareCanvas; 17722 17723 /** 17724 * The top view of the hierarchy. 17725 */ 17726 View mRootView; 17727 17728 IBinder mPanelParentWindowToken; 17729 Surface mSurface; 17730 17731 boolean mHardwareAccelerated; 17732 boolean mHardwareAccelerationRequested; 17733 HardwareRenderer mHardwareRenderer; 17734 17735 boolean mScreenOn; 17736 17737 /** 17738 * Scale factor used by the compatibility mode 17739 */ 17740 float mApplicationScale; 17741 17742 /** 17743 * Indicates whether the application is in compatibility mode 17744 */ 17745 boolean mScalingRequired; 17746 17747 /** 17748 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17749 */ 17750 boolean mTurnOffWindowResizeAnim; 17751 17752 /** 17753 * Left position of this view's window 17754 */ 17755 int mWindowLeft; 17756 17757 /** 17758 * Top position of this view's window 17759 */ 17760 int mWindowTop; 17761 17762 /** 17763 * Indicates whether views need to use 32-bit drawing caches 17764 */ 17765 boolean mUse32BitDrawingCache; 17766 17767 /** 17768 * For windows that are full-screen but using insets to layout inside 17769 * of the screen decorations, these are the current insets for the 17770 * content of the window. 17771 */ 17772 final Rect mContentInsets = new Rect(); 17773 17774 /** 17775 * For windows that are full-screen but using insets to layout inside 17776 * of the screen decorations, these are the current insets for the 17777 * actual visible parts of the window. 17778 */ 17779 final Rect mVisibleInsets = new Rect(); 17780 17781 /** 17782 * The internal insets given by this window. This value is 17783 * supplied by the client (through 17784 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17785 * be given to the window manager when changed to be used in laying 17786 * out windows behind it. 17787 */ 17788 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17789 = new ViewTreeObserver.InternalInsetsInfo(); 17790 17791 /** 17792 * All views in the window's hierarchy that serve as scroll containers, 17793 * used to determine if the window can be resized or must be panned 17794 * to adjust for a soft input area. 17795 */ 17796 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17797 17798 final KeyEvent.DispatcherState mKeyDispatchState 17799 = new KeyEvent.DispatcherState(); 17800 17801 /** 17802 * Indicates whether the view's window currently has the focus. 17803 */ 17804 boolean mHasWindowFocus; 17805 17806 /** 17807 * The current visibility of the window. 17808 */ 17809 int mWindowVisibility; 17810 17811 /** 17812 * Indicates the time at which drawing started to occur. 17813 */ 17814 long mDrawingTime; 17815 17816 /** 17817 * Indicates whether or not ignoring the DIRTY_MASK flags. 17818 */ 17819 boolean mIgnoreDirtyState; 17820 17821 /** 17822 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17823 * to avoid clearing that flag prematurely. 17824 */ 17825 boolean mSetIgnoreDirtyState = false; 17826 17827 /** 17828 * Indicates whether the view's window is currently in touch mode. 17829 */ 17830 boolean mInTouchMode; 17831 17832 /** 17833 * Indicates that ViewAncestor should trigger a global layout change 17834 * the next time it performs a traversal 17835 */ 17836 boolean mRecomputeGlobalAttributes; 17837 17838 /** 17839 * Always report new attributes at next traversal. 17840 */ 17841 boolean mForceReportNewAttributes; 17842 17843 /** 17844 * Set during a traveral if any views want to keep the screen on. 17845 */ 17846 boolean mKeepScreenOn; 17847 17848 /** 17849 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17850 */ 17851 int mSystemUiVisibility; 17852 17853 /** 17854 * Hack to force certain system UI visibility flags to be cleared. 17855 */ 17856 int mDisabledSystemUiVisibility; 17857 17858 /** 17859 * Last global system UI visibility reported by the window manager. 17860 */ 17861 int mGlobalSystemUiVisibility; 17862 17863 /** 17864 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17865 * attached. 17866 */ 17867 boolean mHasSystemUiListeners; 17868 17869 /** 17870 * Set if the visibility of any views has changed. 17871 */ 17872 boolean mViewVisibilityChanged; 17873 17874 /** 17875 * Set to true if a view has been scrolled. 17876 */ 17877 boolean mViewScrollChanged; 17878 17879 /** 17880 * Global to the view hierarchy used as a temporary for dealing with 17881 * x/y points in the transparent region computations. 17882 */ 17883 final int[] mTransparentLocation = new int[2]; 17884 17885 /** 17886 * Global to the view hierarchy used as a temporary for dealing with 17887 * x/y points in the ViewGroup.invalidateChild implementation. 17888 */ 17889 final int[] mInvalidateChildLocation = new int[2]; 17890 17891 17892 /** 17893 * Global to the view hierarchy used as a temporary for dealing with 17894 * x/y location when view is transformed. 17895 */ 17896 final float[] mTmpTransformLocation = new float[2]; 17897 17898 /** 17899 * The view tree observer used to dispatch global events like 17900 * layout, pre-draw, touch mode change, etc. 17901 */ 17902 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17903 17904 /** 17905 * A Canvas used by the view hierarchy to perform bitmap caching. 17906 */ 17907 Canvas mCanvas; 17908 17909 /** 17910 * The view root impl. 17911 */ 17912 final ViewRootImpl mViewRootImpl; 17913 17914 /** 17915 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17916 * handler can be used to pump events in the UI events queue. 17917 */ 17918 final Handler mHandler; 17919 17920 /** 17921 * Temporary for use in computing invalidate rectangles while 17922 * calling up the hierarchy. 17923 */ 17924 final Rect mTmpInvalRect = new Rect(); 17925 17926 /** 17927 * Temporary for use in computing hit areas with transformed views 17928 */ 17929 final RectF mTmpTransformRect = new RectF(); 17930 17931 /** 17932 * Temporary for use in transforming invalidation rect 17933 */ 17934 final Matrix mTmpMatrix = new Matrix(); 17935 17936 /** 17937 * Temporary for use in transforming invalidation rect 17938 */ 17939 final Transformation mTmpTransformation = new Transformation(); 17940 17941 /** 17942 * Temporary list for use in collecting focusable descendents of a view. 17943 */ 17944 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17945 17946 /** 17947 * The id of the window for accessibility purposes. 17948 */ 17949 int mAccessibilityWindowId = View.NO_ID; 17950 17951 /** 17952 * Whether to ingore not exposed for accessibility Views when 17953 * reporting the view tree to accessibility services. 17954 */ 17955 boolean mIncludeNotImportantViews; 17956 17957 /** 17958 * The drawable for highlighting accessibility focus. 17959 */ 17960 Drawable mAccessibilityFocusDrawable; 17961 17962 /** 17963 * Show where the margins, bounds and layout bounds are for each view. 17964 */ 17965 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17966 17967 /** 17968 * Point used to compute visible regions. 17969 */ 17970 final Point mPoint = new Point(); 17971 17972 /** 17973 * Creates a new set of attachment information with the specified 17974 * events handler and thread. 17975 * 17976 * @param handler the events handler the view must use 17977 */ 17978 AttachInfo(IWindowSession session, IWindow window, Display display, 17979 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17980 mSession = session; 17981 mWindow = window; 17982 mWindowToken = window.asBinder(); 17983 mDisplay = display; 17984 mViewRootImpl = viewRootImpl; 17985 mHandler = handler; 17986 mRootCallbacks = effectPlayer; 17987 } 17988 } 17989 17990 /** 17991 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17992 * is supported. This avoids keeping too many unused fields in most 17993 * instances of View.</p> 17994 */ 17995 private static class ScrollabilityCache implements Runnable { 17996 17997 /** 17998 * Scrollbars are not visible 17999 */ 18000 public static final int OFF = 0; 18001 18002 /** 18003 * Scrollbars are visible 18004 */ 18005 public static final int ON = 1; 18006 18007 /** 18008 * Scrollbars are fading away 18009 */ 18010 public static final int FADING = 2; 18011 18012 public boolean fadeScrollBars; 18013 18014 public int fadingEdgeLength; 18015 public int scrollBarDefaultDelayBeforeFade; 18016 public int scrollBarFadeDuration; 18017 18018 public int scrollBarSize; 18019 public ScrollBarDrawable scrollBar; 18020 public float[] interpolatorValues; 18021 public View host; 18022 18023 public final Paint paint; 18024 public final Matrix matrix; 18025 public Shader shader; 18026 18027 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 18028 18029 private static final float[] OPAQUE = { 255 }; 18030 private static final float[] TRANSPARENT = { 0.0f }; 18031 18032 /** 18033 * When fading should start. This time moves into the future every time 18034 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 18035 */ 18036 public long fadeStartTime; 18037 18038 18039 /** 18040 * The current state of the scrollbars: ON, OFF, or FADING 18041 */ 18042 public int state = OFF; 18043 18044 private int mLastColor; 18045 18046 public ScrollabilityCache(ViewConfiguration configuration, View host) { 18047 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 18048 scrollBarSize = configuration.getScaledScrollBarSize(); 18049 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 18050 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 18051 18052 paint = new Paint(); 18053 matrix = new Matrix(); 18054 // use use a height of 1, and then wack the matrix each time we 18055 // actually use it. 18056 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18057 paint.setShader(shader); 18058 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18059 18060 this.host = host; 18061 } 18062 18063 public void setFadeColor(int color) { 18064 if (color != mLastColor) { 18065 mLastColor = color; 18066 18067 if (color != 0) { 18068 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 18069 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 18070 paint.setShader(shader); 18071 // Restore the default transfer mode (src_over) 18072 paint.setXfermode(null); 18073 } else { 18074 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18075 paint.setShader(shader); 18076 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18077 } 18078 } 18079 } 18080 18081 public void run() { 18082 long now = AnimationUtils.currentAnimationTimeMillis(); 18083 if (now >= fadeStartTime) { 18084 18085 // the animation fades the scrollbars out by changing 18086 // the opacity (alpha) from fully opaque to fully 18087 // transparent 18088 int nextFrame = (int) now; 18089 int framesCount = 0; 18090 18091 Interpolator interpolator = scrollBarInterpolator; 18092 18093 // Start opaque 18094 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 18095 18096 // End transparent 18097 nextFrame += scrollBarFadeDuration; 18098 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 18099 18100 state = FADING; 18101 18102 // Kick off the fade animation 18103 host.invalidate(true); 18104 } 18105 } 18106 } 18107 18108 /** 18109 * Resuable callback for sending 18110 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 18111 */ 18112 private class SendViewScrolledAccessibilityEvent implements Runnable { 18113 public volatile boolean mIsPending; 18114 18115 public void run() { 18116 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 18117 mIsPending = false; 18118 } 18119 } 18120 18121 /** 18122 * <p> 18123 * This class represents a delegate that can be registered in a {@link View} 18124 * to enhance accessibility support via composition rather via inheritance. 18125 * It is specifically targeted to widget developers that extend basic View 18126 * classes i.e. classes in package android.view, that would like their 18127 * applications to be backwards compatible. 18128 * </p> 18129 * <div class="special reference"> 18130 * <h3>Developer Guides</h3> 18131 * <p>For more information about making applications accessible, read the 18132 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 18133 * developer guide.</p> 18134 * </div> 18135 * <p> 18136 * A scenario in which a developer would like to use an accessibility delegate 18137 * is overriding a method introduced in a later API version then the minimal API 18138 * version supported by the application. For example, the method 18139 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 18140 * in API version 4 when the accessibility APIs were first introduced. If a 18141 * developer would like his application to run on API version 4 devices (assuming 18142 * all other APIs used by the application are version 4 or lower) and take advantage 18143 * of this method, instead of overriding the method which would break the application's 18144 * backwards compatibility, he can override the corresponding method in this 18145 * delegate and register the delegate in the target View if the API version of 18146 * the system is high enough i.e. the API version is same or higher to the API 18147 * version that introduced 18148 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 18149 * </p> 18150 * <p> 18151 * Here is an example implementation: 18152 * </p> 18153 * <code><pre><p> 18154 * if (Build.VERSION.SDK_INT >= 14) { 18155 * // If the API version is equal of higher than the version in 18156 * // which onInitializeAccessibilityNodeInfo was introduced we 18157 * // register a delegate with a customized implementation. 18158 * View view = findViewById(R.id.view_id); 18159 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 18160 * public void onInitializeAccessibilityNodeInfo(View host, 18161 * AccessibilityNodeInfo info) { 18162 * // Let the default implementation populate the info. 18163 * super.onInitializeAccessibilityNodeInfo(host, info); 18164 * // Set some other information. 18165 * info.setEnabled(host.isEnabled()); 18166 * } 18167 * }); 18168 * } 18169 * </code></pre></p> 18170 * <p> 18171 * This delegate contains methods that correspond to the accessibility methods 18172 * in View. If a delegate has been specified the implementation in View hands 18173 * off handling to the corresponding method in this delegate. The default 18174 * implementation the delegate methods behaves exactly as the corresponding 18175 * method in View for the case of no accessibility delegate been set. Hence, 18176 * to customize the behavior of a View method, clients can override only the 18177 * corresponding delegate method without altering the behavior of the rest 18178 * accessibility related methods of the host view. 18179 * </p> 18180 */ 18181 public static class AccessibilityDelegate { 18182 18183 /** 18184 * Sends an accessibility event of the given type. If accessibility is not 18185 * enabled this method has no effect. 18186 * <p> 18187 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 18188 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 18189 * been set. 18190 * </p> 18191 * 18192 * @param host The View hosting the delegate. 18193 * @param eventType The type of the event to send. 18194 * 18195 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 18196 */ 18197 public void sendAccessibilityEvent(View host, int eventType) { 18198 host.sendAccessibilityEventInternal(eventType); 18199 } 18200 18201 /** 18202 * Performs the specified accessibility action on the view. For 18203 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 18204 * <p> 18205 * The default implementation behaves as 18206 * {@link View#performAccessibilityAction(int, Bundle) 18207 * View#performAccessibilityAction(int, Bundle)} for the case of 18208 * no accessibility delegate been set. 18209 * </p> 18210 * 18211 * @param action The action to perform. 18212 * @return Whether the action was performed. 18213 * 18214 * @see View#performAccessibilityAction(int, Bundle) 18215 * View#performAccessibilityAction(int, Bundle) 18216 */ 18217 public boolean performAccessibilityAction(View host, int action, Bundle args) { 18218 return host.performAccessibilityActionInternal(action, args); 18219 } 18220 18221 /** 18222 * Sends an accessibility event. This method behaves exactly as 18223 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 18224 * empty {@link AccessibilityEvent} and does not perform a check whether 18225 * accessibility is enabled. 18226 * <p> 18227 * The default implementation behaves as 18228 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18229 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 18230 * the case of no accessibility delegate been set. 18231 * </p> 18232 * 18233 * @param host The View hosting the delegate. 18234 * @param event The event to send. 18235 * 18236 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18237 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18238 */ 18239 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 18240 host.sendAccessibilityEventUncheckedInternal(event); 18241 } 18242 18243 /** 18244 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 18245 * to its children for adding their text content to the event. 18246 * <p> 18247 * The default implementation behaves as 18248 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18249 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 18250 * the case of no accessibility delegate been set. 18251 * </p> 18252 * 18253 * @param host The View hosting the delegate. 18254 * @param event The event. 18255 * @return True if the event population was completed. 18256 * 18257 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18258 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18259 */ 18260 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18261 return host.dispatchPopulateAccessibilityEventInternal(event); 18262 } 18263 18264 /** 18265 * Gives a chance to the host View to populate the accessibility event with its 18266 * text content. 18267 * <p> 18268 * The default implementation behaves as 18269 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 18270 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 18271 * the case of no accessibility delegate been set. 18272 * </p> 18273 * 18274 * @param host The View hosting the delegate. 18275 * @param event The accessibility event which to populate. 18276 * 18277 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 18278 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 18279 */ 18280 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18281 host.onPopulateAccessibilityEventInternal(event); 18282 } 18283 18284 /** 18285 * Initializes an {@link AccessibilityEvent} with information about the 18286 * the host View which is the event source. 18287 * <p> 18288 * The default implementation behaves as 18289 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 18290 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 18291 * the case of no accessibility delegate been set. 18292 * </p> 18293 * 18294 * @param host The View hosting the delegate. 18295 * @param event The event to initialize. 18296 * 18297 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 18298 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 18299 */ 18300 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 18301 host.onInitializeAccessibilityEventInternal(event); 18302 } 18303 18304 /** 18305 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 18306 * <p> 18307 * The default implementation behaves as 18308 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18309 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 18310 * the case of no accessibility delegate been set. 18311 * </p> 18312 * 18313 * @param host The View hosting the delegate. 18314 * @param info The instance to initialize. 18315 * 18316 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18317 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18318 */ 18319 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 18320 host.onInitializeAccessibilityNodeInfoInternal(info); 18321 } 18322 18323 /** 18324 * Called when a child of the host View has requested sending an 18325 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 18326 * to augment the event. 18327 * <p> 18328 * The default implementation behaves as 18329 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18330 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 18331 * the case of no accessibility delegate been set. 18332 * </p> 18333 * 18334 * @param host The View hosting the delegate. 18335 * @param child The child which requests sending the event. 18336 * @param event The event to be sent. 18337 * @return True if the event should be sent 18338 * 18339 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18340 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18341 */ 18342 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 18343 AccessibilityEvent event) { 18344 return host.onRequestSendAccessibilityEventInternal(child, event); 18345 } 18346 18347 /** 18348 * Gets the provider for managing a virtual view hierarchy rooted at this View 18349 * and reported to {@link android.accessibilityservice.AccessibilityService}s 18350 * that explore the window content. 18351 * <p> 18352 * The default implementation behaves as 18353 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 18354 * the case of no accessibility delegate been set. 18355 * </p> 18356 * 18357 * @return The provider. 18358 * 18359 * @see AccessibilityNodeProvider 18360 */ 18361 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 18362 return null; 18363 } 18364 } 18365 18366 private class MatchIdPredicate implements Predicate<View> { 18367 public int mId; 18368 18369 @Override 18370 public boolean apply(View view) { 18371 return (view.mID == mId); 18372 } 18373 } 18374 18375 private class MatchLabelForPredicate implements Predicate<View> { 18376 private int mLabeledId; 18377 18378 @Override 18379 public boolean apply(View view) { 18380 return (view.mLabelForId == mLabeledId); 18381 } 18382 } 18383 18384 /** 18385 * Dump all private flags in readable format, useful for documentation and 18386 * sanity checking. 18387 */ 18388 private static void dumpFlags() { 18389 final HashMap<String, String> found = Maps.newHashMap(); 18390 try { 18391 for (Field field : View.class.getDeclaredFields()) { 18392 final int modifiers = field.getModifiers(); 18393 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 18394 if (field.getType().equals(int.class)) { 18395 final int value = field.getInt(null); 18396 dumpFlag(found, field.getName(), value); 18397 } else if (field.getType().equals(int[].class)) { 18398 final int[] values = (int[]) field.get(null); 18399 for (int i = 0; i < values.length; i++) { 18400 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 18401 } 18402 } 18403 } 18404 } 18405 } catch (IllegalAccessException e) { 18406 throw new RuntimeException(e); 18407 } 18408 18409 final ArrayList<String> keys = Lists.newArrayList(); 18410 keys.addAll(found.keySet()); 18411 Collections.sort(keys); 18412 for (String key : keys) { 18413 Log.d(VIEW_LOG_TAG, found.get(key)); 18414 } 18415 } 18416 18417 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 18418 // Sort flags by prefix, then by bits, always keeping unique keys 18419 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 18420 final int prefix = name.indexOf('_'); 18421 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 18422 final String output = bits + " " + name; 18423 found.put(key, output); 18424 } 18425} 18426