View.java revision dd671599bed9d3ca28e2c744e8c224e1e15bc914
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Insets; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.hardware.display.DisplayManagerGlobal; 43import android.os.Build; 44import android.os.Bundle; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Parcel; 48import android.os.Parcelable; 49import android.os.RemoteException; 50import android.os.SystemClock; 51import android.os.SystemProperties; 52import android.text.TextUtils; 53import android.util.AttributeSet; 54import android.util.FloatProperty; 55import android.util.Log; 56import android.util.Pools.SynchronizedPool; 57import android.util.Property; 58import android.util.SparseArray; 59import android.util.TypedValue; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.AccessibilityIterators.TextSegmentIterator; 62import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 63import android.view.AccessibilityIterators.WordTextSegmentIterator; 64import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 65import android.view.accessibility.AccessibilityEvent; 66import android.view.accessibility.AccessibilityEventSource; 67import android.view.accessibility.AccessibilityManager; 68import android.view.accessibility.AccessibilityNodeInfo; 69import android.view.accessibility.AccessibilityNodeProvider; 70import android.view.animation.Animation; 71import android.view.animation.AnimationUtils; 72import android.view.animation.Transformation; 73import android.view.inputmethod.EditorInfo; 74import android.view.inputmethod.InputConnection; 75import android.view.inputmethod.InputMethodManager; 76import android.widget.ScrollBarDrawable; 77 78import static android.os.Build.VERSION_CODES.*; 79import static java.lang.Math.max; 80 81import com.android.internal.R; 82import com.android.internal.util.Predicate; 83import com.android.internal.view.menu.MenuBuilder; 84import com.google.android.collect.Lists; 85import com.google.android.collect.Maps; 86 87import java.lang.ref.WeakReference; 88import java.lang.reflect.Field; 89import java.lang.reflect.InvocationTargetException; 90import java.lang.reflect.Method; 91import java.lang.reflect.Modifier; 92import java.util.ArrayList; 93import java.util.Arrays; 94import java.util.Collections; 95import java.util.HashMap; 96import java.util.Locale; 97import java.util.concurrent.CopyOnWriteArrayList; 98import java.util.concurrent.atomic.AtomicInteger; 99 100/** 101 * <p> 102 * This class represents the basic building block for user interface components. A View 103 * occupies a rectangular area on the screen and is responsible for drawing and 104 * event handling. View is the base class for <em>widgets</em>, which are 105 * used to create interactive UI components (buttons, text fields, etc.). The 106 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 107 * are invisible containers that hold other Views (or other ViewGroups) and define 108 * their layout properties. 109 * </p> 110 * 111 * <div class="special reference"> 112 * <h3>Developer Guides</h3> 113 * <p>For information about using this class to develop your application's user interface, 114 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 115 * </div> 116 * 117 * <a name="Using"></a> 118 * <h3>Using Views</h3> 119 * <p> 120 * All of the views in a window are arranged in a single tree. You can add views 121 * either from code or by specifying a tree of views in one or more XML layout 122 * files. There are many specialized subclasses of views that act as controls or 123 * are capable of displaying text, images, or other content. 124 * </p> 125 * <p> 126 * Once you have created a tree of views, there are typically a few types of 127 * common operations you may wish to perform: 128 * <ul> 129 * <li><strong>Set properties:</strong> for example setting the text of a 130 * {@link android.widget.TextView}. The available properties and the methods 131 * that set them will vary among the different subclasses of views. Note that 132 * properties that are known at build time can be set in the XML layout 133 * files.</li> 134 * <li><strong>Set focus:</strong> The framework will handled moving focus in 135 * response to user input. To force focus to a specific view, call 136 * {@link #requestFocus}.</li> 137 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 138 * that will be notified when something interesting happens to the view. For 139 * example, all views will let you set a listener to be notified when the view 140 * gains or loses focus. You can register such a listener using 141 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 142 * Other view subclasses offer more specialized listeners. For example, a Button 143 * exposes a listener to notify clients when the button is clicked.</li> 144 * <li><strong>Set visibility:</strong> You can hide or show views using 145 * {@link #setVisibility(int)}.</li> 146 * </ul> 147 * </p> 148 * <p><em> 149 * Note: The Android framework is responsible for measuring, laying out and 150 * drawing views. You should not call methods that perform these actions on 151 * views yourself unless you are actually implementing a 152 * {@link android.view.ViewGroup}. 153 * </em></p> 154 * 155 * <a name="Lifecycle"></a> 156 * <h3>Implementing a Custom View</h3> 157 * 158 * <p> 159 * To implement a custom view, you will usually begin by providing overrides for 160 * some of the standard methods that the framework calls on all views. You do 161 * not need to override all of these methods. In fact, you can start by just 162 * overriding {@link #onDraw(android.graphics.Canvas)}. 163 * <table border="2" width="85%" align="center" cellpadding="5"> 164 * <thead> 165 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 166 * </thead> 167 * 168 * <tbody> 169 * <tr> 170 * <td rowspan="2">Creation</td> 171 * <td>Constructors</td> 172 * <td>There is a form of the constructor that are called when the view 173 * is created from code and a form that is called when the view is 174 * inflated from a layout file. The second form should parse and apply 175 * any attributes defined in the layout file. 176 * </td> 177 * </tr> 178 * <tr> 179 * <td><code>{@link #onFinishInflate()}</code></td> 180 * <td>Called after a view and all of its children has been inflated 181 * from XML.</td> 182 * </tr> 183 * 184 * <tr> 185 * <td rowspan="3">Layout</td> 186 * <td><code>{@link #onMeasure(int, int)}</code></td> 187 * <td>Called to determine the size requirements for this view and all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 193 * <td>Called when this view should assign a size and position to all 194 * of its children. 195 * </td> 196 * </tr> 197 * <tr> 198 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 199 * <td>Called when the size of this view has changed. 200 * </td> 201 * </tr> 202 * 203 * <tr> 204 * <td>Drawing</td> 205 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 206 * <td>Called when the view should render its content. 207 * </td> 208 * </tr> 209 * 210 * <tr> 211 * <td rowspan="4">Event processing</td> 212 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 213 * <td>Called when a new hardware key event occurs. 214 * </td> 215 * </tr> 216 * <tr> 217 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 218 * <td>Called when a hardware key up event occurs. 219 * </td> 220 * </tr> 221 * <tr> 222 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 223 * <td>Called when a trackball motion event occurs. 224 * </td> 225 * </tr> 226 * <tr> 227 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 228 * <td>Called when a touch screen motion event occurs. 229 * </td> 230 * </tr> 231 * 232 * <tr> 233 * <td rowspan="2">Focus</td> 234 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 235 * <td>Called when the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 241 * <td>Called when the window containing the view gains or loses focus. 242 * </td> 243 * </tr> 244 * 245 * <tr> 246 * <td rowspan="3">Attaching</td> 247 * <td><code>{@link #onAttachedToWindow()}</code></td> 248 * <td>Called when the view is attached to a window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onDetachedFromWindow}</code></td> 254 * <td>Called when the view is detached from its window. 255 * </td> 256 * </tr> 257 * 258 * <tr> 259 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 260 * <td>Called when the visibility of the window containing the view 261 * has changed. 262 * </td> 263 * </tr> 264 * </tbody> 265 * 266 * </table> 267 * </p> 268 * 269 * <a name="IDs"></a> 270 * <h3>IDs</h3> 271 * Views may have an integer id associated with them. These ids are typically 272 * assigned in the layout XML files, and are used to find specific views within 273 * the view tree. A common pattern is to: 274 * <ul> 275 * <li>Define a Button in the layout file and assign it a unique ID. 276 * <pre> 277 * <Button 278 * android:id="@+id/my_button" 279 * android:layout_width="wrap_content" 280 * android:layout_height="wrap_content" 281 * android:text="@string/my_button_text"/> 282 * </pre></li> 283 * <li>From the onCreate method of an Activity, find the Button 284 * <pre class="prettyprint"> 285 * Button myButton = (Button) findViewById(R.id.my_button); 286 * </pre></li> 287 * </ul> 288 * <p> 289 * View IDs need not be unique throughout the tree, but it is good practice to 290 * ensure that they are at least unique within the part of the tree you are 291 * searching. 292 * </p> 293 * 294 * <a name="Position"></a> 295 * <h3>Position</h3> 296 * <p> 297 * The geometry of a view is that of a rectangle. A view has a location, 298 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 299 * two dimensions, expressed as a width and a height. The unit for location 300 * and dimensions is the pixel. 301 * </p> 302 * 303 * <p> 304 * It is possible to retrieve the location of a view by invoking the methods 305 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 306 * coordinate of the rectangle representing the view. The latter returns the 307 * top, or Y, coordinate of the rectangle representing the view. These methods 308 * both return the location of the view relative to its parent. For instance, 309 * when getLeft() returns 20, that means the view is located 20 pixels to the 310 * right of the left edge of its direct parent. 311 * </p> 312 * 313 * <p> 314 * In addition, several convenience methods are offered to avoid unnecessary 315 * computations, namely {@link #getRight()} and {@link #getBottom()}. 316 * These methods return the coordinates of the right and bottom edges of the 317 * rectangle representing the view. For instance, calling {@link #getRight()} 318 * is similar to the following computation: <code>getLeft() + getWidth()</code> 319 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 320 * </p> 321 * 322 * <a name="SizePaddingMargins"></a> 323 * <h3>Size, padding and margins</h3> 324 * <p> 325 * The size of a view is expressed with a width and a height. A view actually 326 * possess two pairs of width and height values. 327 * </p> 328 * 329 * <p> 330 * The first pair is known as <em>measured width</em> and 331 * <em>measured height</em>. These dimensions define how big a view wants to be 332 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 333 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 334 * and {@link #getMeasuredHeight()}. 335 * </p> 336 * 337 * <p> 338 * The second pair is simply known as <em>width</em> and <em>height</em>, or 339 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 340 * dimensions define the actual size of the view on screen, at drawing time and 341 * after layout. These values may, but do not have to, be different from the 342 * measured width and height. The width and height can be obtained by calling 343 * {@link #getWidth()} and {@link #getHeight()}. 344 * </p> 345 * 346 * <p> 347 * To measure its dimensions, a view takes into account its padding. The padding 348 * is expressed in pixels for the left, top, right and bottom parts of the view. 349 * Padding can be used to offset the content of the view by a specific amount of 350 * pixels. For instance, a left padding of 2 will push the view's content by 351 * 2 pixels to the right of the left edge. Padding can be set using the 352 * {@link #setPadding(int, int, int, int)} or {@link #setPaddingRelative(int, int, int, int)} 353 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 354 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 355 * {@link #getPaddingEnd()}. 356 * </p> 357 * 358 * <p> 359 * Even though a view can define a padding, it does not provide any support for 360 * margins. However, view groups provide such a support. Refer to 361 * {@link android.view.ViewGroup} and 362 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 363 * </p> 364 * 365 * <a name="Layout"></a> 366 * <h3>Layout</h3> 367 * <p> 368 * Layout is a two pass process: a measure pass and a layout pass. The measuring 369 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 370 * of the view tree. Each view pushes dimension specifications down the tree 371 * during the recursion. At the end of the measure pass, every view has stored 372 * its measurements. The second pass happens in 373 * {@link #layout(int,int,int,int)} and is also top-down. During 374 * this pass each parent is responsible for positioning all of its children 375 * using the sizes computed in the measure pass. 376 * </p> 377 * 378 * <p> 379 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 380 * {@link #getMeasuredHeight()} values must be set, along with those for all of 381 * that view's descendants. A view's measured width and measured height values 382 * must respect the constraints imposed by the view's parents. This guarantees 383 * that at the end of the measure pass, all parents accept all of their 384 * children's measurements. A parent view may call measure() more than once on 385 * its children. For example, the parent may measure each child once with 386 * unspecified dimensions to find out how big they want to be, then call 387 * measure() on them again with actual numbers if the sum of all the children's 388 * unconstrained sizes is too big or too small. 389 * </p> 390 * 391 * <p> 392 * The measure pass uses two classes to communicate dimensions. The 393 * {@link MeasureSpec} class is used by views to tell their parents how they 394 * want to be measured and positioned. The base LayoutParams class just 395 * describes how big the view wants to be for both width and height. For each 396 * dimension, it can specify one of: 397 * <ul> 398 * <li> an exact number 399 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 400 * (minus padding) 401 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 402 * enclose its content (plus padding). 403 * </ul> 404 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 405 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 406 * an X and Y value. 407 * </p> 408 * 409 * <p> 410 * MeasureSpecs are used to push requirements down the tree from parent to 411 * child. A MeasureSpec can be in one of three modes: 412 * <ul> 413 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 414 * of a child view. For example, a LinearLayout may call measure() on its child 415 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 416 * tall the child view wants to be given a width of 240 pixels. 417 * <li>EXACTLY: This is used by the parent to impose an exact size on the 418 * child. The child must use this size, and guarantee that all of its 419 * descendants will fit within this size. 420 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 421 * child. The child must gurantee that it and all of its descendants will fit 422 * within this size. 423 * </ul> 424 * </p> 425 * 426 * <p> 427 * To intiate a layout, call {@link #requestLayout}. This method is typically 428 * called by a view on itself when it believes that is can no longer fit within 429 * its current bounds. 430 * </p> 431 * 432 * <a name="Drawing"></a> 433 * <h3>Drawing</h3> 434 * <p> 435 * Drawing is handled by walking the tree and rendering each view that 436 * intersects the invalid region. Because the tree is traversed in-order, 437 * this means that parents will draw before (i.e., behind) their children, with 438 * siblings drawn in the order they appear in the tree. 439 * If you set a background drawable for a View, then the View will draw it for you 440 * before calling back to its <code>onDraw()</code> method. 441 * </p> 442 * 443 * <p> 444 * Note that the framework will not draw views that are not in the invalid region. 445 * </p> 446 * 447 * <p> 448 * To force a view to draw, call {@link #invalidate()}. 449 * </p> 450 * 451 * <a name="EventHandlingThreading"></a> 452 * <h3>Event Handling and Threading</h3> 453 * <p> 454 * The basic cycle of a view is as follows: 455 * <ol> 456 * <li>An event comes in and is dispatched to the appropriate view. The view 457 * handles the event and notifies any listeners.</li> 458 * <li>If in the course of processing the event, the view's bounds may need 459 * to be changed, the view will call {@link #requestLayout()}.</li> 460 * <li>Similarly, if in the course of processing the event the view's appearance 461 * may need to be changed, the view will call {@link #invalidate()}.</li> 462 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 463 * the framework will take care of measuring, laying out, and drawing the tree 464 * as appropriate.</li> 465 * </ol> 466 * </p> 467 * 468 * <p><em>Note: The entire view tree is single threaded. You must always be on 469 * the UI thread when calling any method on any view.</em> 470 * If you are doing work on other threads and want to update the state of a view 471 * from that thread, you should use a {@link Handler}. 472 * </p> 473 * 474 * <a name="FocusHandling"></a> 475 * <h3>Focus Handling</h3> 476 * <p> 477 * The framework will handle routine focus movement in response to user input. 478 * This includes changing the focus as views are removed or hidden, or as new 479 * views become available. Views indicate their willingness to take focus 480 * through the {@link #isFocusable} method. To change whether a view can take 481 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 482 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 483 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 484 * </p> 485 * <p> 486 * Focus movement is based on an algorithm which finds the nearest neighbor in a 487 * given direction. In rare cases, the default algorithm may not match the 488 * intended behavior of the developer. In these situations, you can provide 489 * explicit overrides by using these XML attributes in the layout file: 490 * <pre> 491 * nextFocusDown 492 * nextFocusLeft 493 * nextFocusRight 494 * nextFocusUp 495 * </pre> 496 * </p> 497 * 498 * 499 * <p> 500 * To get a particular view to take focus, call {@link #requestFocus()}. 501 * </p> 502 * 503 * <a name="TouchMode"></a> 504 * <h3>Touch Mode</h3> 505 * <p> 506 * When a user is navigating a user interface via directional keys such as a D-pad, it is 507 * necessary to give focus to actionable items such as buttons so the user can see 508 * what will take input. If the device has touch capabilities, however, and the user 509 * begins interacting with the interface by touching it, it is no longer necessary to 510 * always highlight, or give focus to, a particular view. This motivates a mode 511 * for interaction named 'touch mode'. 512 * </p> 513 * <p> 514 * For a touch capable device, once the user touches the screen, the device 515 * will enter touch mode. From this point onward, only views for which 516 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 517 * Other views that are touchable, like buttons, will not take focus when touched; they will 518 * only fire the on click listeners. 519 * </p> 520 * <p> 521 * Any time a user hits a directional key, such as a D-pad direction, the view device will 522 * exit touch mode, and find a view to take focus, so that the user may resume interacting 523 * with the user interface without touching the screen again. 524 * </p> 525 * <p> 526 * The touch mode state is maintained across {@link android.app.Activity}s. Call 527 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 528 * </p> 529 * 530 * <a name="Scrolling"></a> 531 * <h3>Scrolling</h3> 532 * <p> 533 * The framework provides basic support for views that wish to internally 534 * scroll their content. This includes keeping track of the X and Y scroll 535 * offset as well as mechanisms for drawing scrollbars. See 536 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 537 * {@link #awakenScrollBars()} for more details. 538 * </p> 539 * 540 * <a name="Tags"></a> 541 * <h3>Tags</h3> 542 * <p> 543 * Unlike IDs, tags are not used to identify views. Tags are essentially an 544 * extra piece of information that can be associated with a view. They are most 545 * often used as a convenience to store data related to views in the views 546 * themselves rather than by putting them in a separate structure. 547 * </p> 548 * 549 * <a name="Properties"></a> 550 * <h3>Properties</h3> 551 * <p> 552 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 553 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 554 * available both in the {@link Property} form as well as in similarly-named setter/getter 555 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 556 * be used to set persistent state associated with these rendering-related properties on the view. 557 * The properties and methods can also be used in conjunction with 558 * {@link android.animation.Animator Animator}-based animations, described more in the 559 * <a href="#Animation">Animation</a> section. 560 * </p> 561 * 562 * <a name="Animation"></a> 563 * <h3>Animation</h3> 564 * <p> 565 * Starting with Android 3.0, the preferred way of animating views is to use the 566 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 567 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 568 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 569 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 570 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 571 * makes animating these View properties particularly easy and efficient. 572 * </p> 573 * <p> 574 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 575 * You can attach an {@link Animation} object to a view using 576 * {@link #setAnimation(Animation)} or 577 * {@link #startAnimation(Animation)}. The animation can alter the scale, 578 * rotation, translation and alpha of a view over time. If the animation is 579 * attached to a view that has children, the animation will affect the entire 580 * subtree rooted by that node. When an animation is started, the framework will 581 * take care of redrawing the appropriate views until the animation completes. 582 * </p> 583 * 584 * <a name="Security"></a> 585 * <h3>Security</h3> 586 * <p> 587 * Sometimes it is essential that an application be able to verify that an action 588 * is being performed with the full knowledge and consent of the user, such as 589 * granting a permission request, making a purchase or clicking on an advertisement. 590 * Unfortunately, a malicious application could try to spoof the user into 591 * performing these actions, unaware, by concealing the intended purpose of the view. 592 * As a remedy, the framework offers a touch filtering mechanism that can be used to 593 * improve the security of views that provide access to sensitive functionality. 594 * </p><p> 595 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 596 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 597 * will discard touches that are received whenever the view's window is obscured by 598 * another visible window. As a result, the view will not receive touches whenever a 599 * toast, dialog or other window appears above the view's window. 600 * </p><p> 601 * For more fine-grained control over security, consider overriding the 602 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 603 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 604 * </p> 605 * 606 * @attr ref android.R.styleable#View_alpha 607 * @attr ref android.R.styleable#View_background 608 * @attr ref android.R.styleable#View_clickable 609 * @attr ref android.R.styleable#View_contentDescription 610 * @attr ref android.R.styleable#View_drawingCacheQuality 611 * @attr ref android.R.styleable#View_duplicateParentState 612 * @attr ref android.R.styleable#View_id 613 * @attr ref android.R.styleable#View_requiresFadingEdge 614 * @attr ref android.R.styleable#View_fadeScrollbars 615 * @attr ref android.R.styleable#View_fadingEdgeLength 616 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 617 * @attr ref android.R.styleable#View_fitsSystemWindows 618 * @attr ref android.R.styleable#View_isScrollContainer 619 * @attr ref android.R.styleable#View_focusable 620 * @attr ref android.R.styleable#View_focusableInTouchMode 621 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 622 * @attr ref android.R.styleable#View_keepScreenOn 623 * @attr ref android.R.styleable#View_layerType 624 * @attr ref android.R.styleable#View_layoutDirection 625 * @attr ref android.R.styleable#View_longClickable 626 * @attr ref android.R.styleable#View_minHeight 627 * @attr ref android.R.styleable#View_minWidth 628 * @attr ref android.R.styleable#View_nextFocusDown 629 * @attr ref android.R.styleable#View_nextFocusLeft 630 * @attr ref android.R.styleable#View_nextFocusRight 631 * @attr ref android.R.styleable#View_nextFocusUp 632 * @attr ref android.R.styleable#View_onClick 633 * @attr ref android.R.styleable#View_padding 634 * @attr ref android.R.styleable#View_paddingBottom 635 * @attr ref android.R.styleable#View_paddingLeft 636 * @attr ref android.R.styleable#View_paddingRight 637 * @attr ref android.R.styleable#View_paddingTop 638 * @attr ref android.R.styleable#View_paddingStart 639 * @attr ref android.R.styleable#View_paddingEnd 640 * @attr ref android.R.styleable#View_saveEnabled 641 * @attr ref android.R.styleable#View_rotation 642 * @attr ref android.R.styleable#View_rotationX 643 * @attr ref android.R.styleable#View_rotationY 644 * @attr ref android.R.styleable#View_scaleX 645 * @attr ref android.R.styleable#View_scaleY 646 * @attr ref android.R.styleable#View_scrollX 647 * @attr ref android.R.styleable#View_scrollY 648 * @attr ref android.R.styleable#View_scrollbarSize 649 * @attr ref android.R.styleable#View_scrollbarStyle 650 * @attr ref android.R.styleable#View_scrollbars 651 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 652 * @attr ref android.R.styleable#View_scrollbarFadeDuration 653 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 654 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 655 * @attr ref android.R.styleable#View_scrollbarThumbVertical 656 * @attr ref android.R.styleable#View_scrollbarTrackVertical 657 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 658 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 659 * @attr ref android.R.styleable#View_soundEffectsEnabled 660 * @attr ref android.R.styleable#View_tag 661 * @attr ref android.R.styleable#View_textAlignment 662 * @attr ref android.R.styleable#View_textDirection 663 * @attr ref android.R.styleable#View_transformPivotX 664 * @attr ref android.R.styleable#View_transformPivotY 665 * @attr ref android.R.styleable#View_translationX 666 * @attr ref android.R.styleable#View_translationY 667 * @attr ref android.R.styleable#View_visibility 668 * 669 * @see android.view.ViewGroup 670 */ 671public class View implements Drawable.Callback, KeyEvent.Callback, 672 AccessibilityEventSource { 673 private static final boolean DBG = false; 674 675 /** 676 * The logging tag used by this class with android.util.Log. 677 */ 678 protected static final String VIEW_LOG_TAG = "View"; 679 680 /** 681 * When set to true, apps will draw debugging information about their layouts. 682 * 683 * @hide 684 */ 685 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 686 687 /** 688 * Used to mark a View that has no ID. 689 */ 690 public static final int NO_ID = -1; 691 692 private static boolean sUseBrokenMakeMeasureSpec = false; 693 694 /** 695 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 696 * calling setFlags. 697 */ 698 private static final int NOT_FOCUSABLE = 0x00000000; 699 700 /** 701 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 702 * setFlags. 703 */ 704 private static final int FOCUSABLE = 0x00000001; 705 706 /** 707 * Mask for use with setFlags indicating bits used for focus. 708 */ 709 private static final int FOCUSABLE_MASK = 0x00000001; 710 711 /** 712 * This view will adjust its padding to fit sytem windows (e.g. status bar) 713 */ 714 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 715 716 /** 717 * This view is visible. 718 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 719 * android:visibility}. 720 */ 721 public static final int VISIBLE = 0x00000000; 722 723 /** 724 * This view is invisible, but it still takes up space for layout purposes. 725 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 726 * android:visibility}. 727 */ 728 public static final int INVISIBLE = 0x00000004; 729 730 /** 731 * This view is invisible, and it doesn't take any space for layout 732 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 733 * android:visibility}. 734 */ 735 public static final int GONE = 0x00000008; 736 737 /** 738 * Mask for use with setFlags indicating bits used for visibility. 739 * {@hide} 740 */ 741 static final int VISIBILITY_MASK = 0x0000000C; 742 743 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 744 745 /** 746 * This view is enabled. Interpretation varies by subclass. 747 * Use with ENABLED_MASK when calling setFlags. 748 * {@hide} 749 */ 750 static final int ENABLED = 0x00000000; 751 752 /** 753 * This view is disabled. Interpretation varies by subclass. 754 * Use with ENABLED_MASK when calling setFlags. 755 * {@hide} 756 */ 757 static final int DISABLED = 0x00000020; 758 759 /** 760 * Mask for use with setFlags indicating bits used for indicating whether 761 * this view is enabled 762 * {@hide} 763 */ 764 static final int ENABLED_MASK = 0x00000020; 765 766 /** 767 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 768 * called and further optimizations will be performed. It is okay to have 769 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 770 * {@hide} 771 */ 772 static final int WILL_NOT_DRAW = 0x00000080; 773 774 /** 775 * Mask for use with setFlags indicating bits used for indicating whether 776 * this view is will draw 777 * {@hide} 778 */ 779 static final int DRAW_MASK = 0x00000080; 780 781 /** 782 * <p>This view doesn't show scrollbars.</p> 783 * {@hide} 784 */ 785 static final int SCROLLBARS_NONE = 0x00000000; 786 787 /** 788 * <p>This view shows horizontal scrollbars.</p> 789 * {@hide} 790 */ 791 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 792 793 /** 794 * <p>This view shows vertical scrollbars.</p> 795 * {@hide} 796 */ 797 static final int SCROLLBARS_VERTICAL = 0x00000200; 798 799 /** 800 * <p>Mask for use with setFlags indicating bits used for indicating which 801 * scrollbars are enabled.</p> 802 * {@hide} 803 */ 804 static final int SCROLLBARS_MASK = 0x00000300; 805 806 /** 807 * Indicates that the view should filter touches when its window is obscured. 808 * Refer to the class comments for more information about this security feature. 809 * {@hide} 810 */ 811 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 812 813 /** 814 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 815 * that they are optional and should be skipped if the window has 816 * requested system UI flags that ignore those insets for layout. 817 */ 818 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 819 820 /** 821 * <p>This view doesn't show fading edges.</p> 822 * {@hide} 823 */ 824 static final int FADING_EDGE_NONE = 0x00000000; 825 826 /** 827 * <p>This view shows horizontal fading edges.</p> 828 * {@hide} 829 */ 830 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 831 832 /** 833 * <p>This view shows vertical fading edges.</p> 834 * {@hide} 835 */ 836 static final int FADING_EDGE_VERTICAL = 0x00002000; 837 838 /** 839 * <p>Mask for use with setFlags indicating bits used for indicating which 840 * fading edges are enabled.</p> 841 * {@hide} 842 */ 843 static final int FADING_EDGE_MASK = 0x00003000; 844 845 /** 846 * <p>Indicates this view can be clicked. When clickable, a View reacts 847 * to clicks by notifying the OnClickListener.<p> 848 * {@hide} 849 */ 850 static final int CLICKABLE = 0x00004000; 851 852 /** 853 * <p>Indicates this view is caching its drawing into a bitmap.</p> 854 * {@hide} 855 */ 856 static final int DRAWING_CACHE_ENABLED = 0x00008000; 857 858 /** 859 * <p>Indicates that no icicle should be saved for this view.<p> 860 * {@hide} 861 */ 862 static final int SAVE_DISABLED = 0x000010000; 863 864 /** 865 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 866 * property.</p> 867 * {@hide} 868 */ 869 static final int SAVE_DISABLED_MASK = 0x000010000; 870 871 /** 872 * <p>Indicates that no drawing cache should ever be created for this view.<p> 873 * {@hide} 874 */ 875 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 876 877 /** 878 * <p>Indicates this view can take / keep focus when int touch mode.</p> 879 * {@hide} 880 */ 881 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 882 883 /** 884 * <p>Enables low quality mode for the drawing cache.</p> 885 */ 886 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 887 888 /** 889 * <p>Enables high quality mode for the drawing cache.</p> 890 */ 891 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 892 893 /** 894 * <p>Enables automatic quality mode for the drawing cache.</p> 895 */ 896 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 897 898 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 899 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 900 }; 901 902 /** 903 * <p>Mask for use with setFlags indicating bits used for the cache 904 * quality property.</p> 905 * {@hide} 906 */ 907 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 908 909 /** 910 * <p> 911 * Indicates this view can be long clicked. When long clickable, a View 912 * reacts to long clicks by notifying the OnLongClickListener or showing a 913 * context menu. 914 * </p> 915 * {@hide} 916 */ 917 static final int LONG_CLICKABLE = 0x00200000; 918 919 /** 920 * <p>Indicates that this view gets its drawable states from its direct parent 921 * and ignores its original internal states.</p> 922 * 923 * @hide 924 */ 925 static final int DUPLICATE_PARENT_STATE = 0x00400000; 926 927 /** 928 * The scrollbar style to display the scrollbars inside the content area, 929 * without increasing the padding. The scrollbars will be overlaid with 930 * translucency on the view's content. 931 */ 932 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 933 934 /** 935 * The scrollbar style to display the scrollbars inside the padded area, 936 * increasing the padding of the view. The scrollbars will not overlap the 937 * content area of the view. 938 */ 939 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 940 941 /** 942 * The scrollbar style to display the scrollbars at the edge of the view, 943 * without increasing the padding. The scrollbars will be overlaid with 944 * translucency. 945 */ 946 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 947 948 /** 949 * The scrollbar style to display the scrollbars at the edge of the view, 950 * increasing the padding of the view. The scrollbars will only overlap the 951 * background, if any. 952 */ 953 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 954 955 /** 956 * Mask to check if the scrollbar style is overlay or inset. 957 * {@hide} 958 */ 959 static final int SCROLLBARS_INSET_MASK = 0x01000000; 960 961 /** 962 * Mask to check if the scrollbar style is inside or outside. 963 * {@hide} 964 */ 965 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 966 967 /** 968 * Mask for scrollbar style. 969 * {@hide} 970 */ 971 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 972 973 /** 974 * View flag indicating that the screen should remain on while the 975 * window containing this view is visible to the user. This effectively 976 * takes care of automatically setting the WindowManager's 977 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 978 */ 979 public static final int KEEP_SCREEN_ON = 0x04000000; 980 981 /** 982 * View flag indicating whether this view should have sound effects enabled 983 * for events such as clicking and touching. 984 */ 985 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 986 987 /** 988 * View flag indicating whether this view should have haptic feedback 989 * enabled for events such as long presses. 990 */ 991 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 992 993 /** 994 * <p>Indicates that the view hierarchy should stop saving state when 995 * it reaches this view. If state saving is initiated immediately at 996 * the view, it will be allowed. 997 * {@hide} 998 */ 999 static final int PARENT_SAVE_DISABLED = 0x20000000; 1000 1001 /** 1002 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 1003 * {@hide} 1004 */ 1005 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 1006 1007 /** 1008 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1009 * should add all focusable Views regardless if they are focusable in touch mode. 1010 */ 1011 public static final int FOCUSABLES_ALL = 0x00000000; 1012 1013 /** 1014 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1015 * should add only Views focusable in touch mode. 1016 */ 1017 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1018 1019 /** 1020 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1021 * item. 1022 */ 1023 public static final int FOCUS_BACKWARD = 0x00000001; 1024 1025 /** 1026 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1027 * item. 1028 */ 1029 public static final int FOCUS_FORWARD = 0x00000002; 1030 1031 /** 1032 * Use with {@link #focusSearch(int)}. Move focus to the left. 1033 */ 1034 public static final int FOCUS_LEFT = 0x00000011; 1035 1036 /** 1037 * Use with {@link #focusSearch(int)}. Move focus up. 1038 */ 1039 public static final int FOCUS_UP = 0x00000021; 1040 1041 /** 1042 * Use with {@link #focusSearch(int)}. Move focus to the right. 1043 */ 1044 public static final int FOCUS_RIGHT = 0x00000042; 1045 1046 /** 1047 * Use with {@link #focusSearch(int)}. Move focus down. 1048 */ 1049 public static final int FOCUS_DOWN = 0x00000082; 1050 1051 /** 1052 * Bits of {@link #getMeasuredWidthAndState()} and 1053 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1054 */ 1055 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1056 1057 /** 1058 * Bits of {@link #getMeasuredWidthAndState()} and 1059 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1060 */ 1061 public static final int MEASURED_STATE_MASK = 0xff000000; 1062 1063 /** 1064 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1065 * for functions that combine both width and height into a single int, 1066 * such as {@link #getMeasuredState()} and the childState argument of 1067 * {@link #resolveSizeAndState(int, int, int)}. 1068 */ 1069 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1070 1071 /** 1072 * Bit of {@link #getMeasuredWidthAndState()} and 1073 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1074 * is smaller that the space the view would like to have. 1075 */ 1076 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1077 1078 /** 1079 * Base View state sets 1080 */ 1081 // Singles 1082 /** 1083 * Indicates the view has no states set. States are used with 1084 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1085 * view depending on its state. 1086 * 1087 * @see android.graphics.drawable.Drawable 1088 * @see #getDrawableState() 1089 */ 1090 protected static final int[] EMPTY_STATE_SET; 1091 /** 1092 * Indicates the view is enabled. States are used with 1093 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1094 * view depending on its state. 1095 * 1096 * @see android.graphics.drawable.Drawable 1097 * @see #getDrawableState() 1098 */ 1099 protected static final int[] ENABLED_STATE_SET; 1100 /** 1101 * Indicates the view is focused. States are used with 1102 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1103 * view depending on its state. 1104 * 1105 * @see android.graphics.drawable.Drawable 1106 * @see #getDrawableState() 1107 */ 1108 protected static final int[] FOCUSED_STATE_SET; 1109 /** 1110 * Indicates the view is selected. States are used with 1111 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1112 * view depending on its state. 1113 * 1114 * @see android.graphics.drawable.Drawable 1115 * @see #getDrawableState() 1116 */ 1117 protected static final int[] SELECTED_STATE_SET; 1118 /** 1119 * Indicates the view is pressed. States are used with 1120 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1121 * view depending on its state. 1122 * 1123 * @see android.graphics.drawable.Drawable 1124 * @see #getDrawableState() 1125 * @hide 1126 */ 1127 protected static final int[] PRESSED_STATE_SET; 1128 /** 1129 * Indicates the view's window has focus. States are used with 1130 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1131 * view depending on its state. 1132 * 1133 * @see android.graphics.drawable.Drawable 1134 * @see #getDrawableState() 1135 */ 1136 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1137 // Doubles 1138 /** 1139 * Indicates the view is enabled and has the focus. 1140 * 1141 * @see #ENABLED_STATE_SET 1142 * @see #FOCUSED_STATE_SET 1143 */ 1144 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1145 /** 1146 * Indicates the view is enabled and selected. 1147 * 1148 * @see #ENABLED_STATE_SET 1149 * @see #SELECTED_STATE_SET 1150 */ 1151 protected static final int[] ENABLED_SELECTED_STATE_SET; 1152 /** 1153 * Indicates the view is enabled and that its window has focus. 1154 * 1155 * @see #ENABLED_STATE_SET 1156 * @see #WINDOW_FOCUSED_STATE_SET 1157 */ 1158 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1159 /** 1160 * Indicates the view is focused and selected. 1161 * 1162 * @see #FOCUSED_STATE_SET 1163 * @see #SELECTED_STATE_SET 1164 */ 1165 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1166 /** 1167 * Indicates the view has the focus and that its window has the focus. 1168 * 1169 * @see #FOCUSED_STATE_SET 1170 * @see #WINDOW_FOCUSED_STATE_SET 1171 */ 1172 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1173 /** 1174 * Indicates the view is selected and that its window has the focus. 1175 * 1176 * @see #SELECTED_STATE_SET 1177 * @see #WINDOW_FOCUSED_STATE_SET 1178 */ 1179 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1180 // Triples 1181 /** 1182 * Indicates the view is enabled, focused and selected. 1183 * 1184 * @see #ENABLED_STATE_SET 1185 * @see #FOCUSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 */ 1188 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1189 /** 1190 * Indicates the view is enabled, focused and its window has the focus. 1191 * 1192 * @see #ENABLED_STATE_SET 1193 * @see #FOCUSED_STATE_SET 1194 * @see #WINDOW_FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is enabled, selected and its window has the focus. 1199 * 1200 * @see #ENABLED_STATE_SET 1201 * @see #SELECTED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is focused, selected and its window has the focus. 1207 * 1208 * @see #FOCUSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #WINDOW_FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1213 /** 1214 * Indicates the view is enabled, focused, selected and its window 1215 * has the focus. 1216 * 1217 * @see #ENABLED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 * @see #SELECTED_STATE_SET 1220 * @see #WINDOW_FOCUSED_STATE_SET 1221 */ 1222 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1223 /** 1224 * Indicates the view is pressed and its window has the focus. 1225 * 1226 * @see #PRESSED_STATE_SET 1227 * @see #WINDOW_FOCUSED_STATE_SET 1228 */ 1229 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1230 /** 1231 * Indicates the view is pressed and selected. 1232 * 1233 * @see #PRESSED_STATE_SET 1234 * @see #SELECTED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_SELECTED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, selected and its window has the focus. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #SELECTED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed and focused. 1247 * 1248 * @see #PRESSED_STATE_SET 1249 * @see #FOCUSED_STATE_SET 1250 */ 1251 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1252 /** 1253 * Indicates the view is pressed, focused and its window has the focus. 1254 * 1255 * @see #PRESSED_STATE_SET 1256 * @see #FOCUSED_STATE_SET 1257 * @see #WINDOW_FOCUSED_STATE_SET 1258 */ 1259 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1260 /** 1261 * Indicates the view is pressed, focused and selected. 1262 * 1263 * @see #PRESSED_STATE_SET 1264 * @see #SELECTED_STATE_SET 1265 * @see #FOCUSED_STATE_SET 1266 */ 1267 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1268 /** 1269 * Indicates the view is pressed, focused, selected and its window has the focus. 1270 * 1271 * @see #PRESSED_STATE_SET 1272 * @see #FOCUSED_STATE_SET 1273 * @see #SELECTED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed and enabled. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #ENABLED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_ENABLED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, enabled and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #ENABLED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed, enabled and selected. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #ENABLED_STATE_SET 1297 * @see #SELECTED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, enabled, selected and its window has the 1302 * focus. 1303 * 1304 * @see #PRESSED_STATE_SET 1305 * @see #ENABLED_STATE_SET 1306 * @see #SELECTED_STATE_SET 1307 * @see #WINDOW_FOCUSED_STATE_SET 1308 */ 1309 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1310 /** 1311 * Indicates the view is pressed, enabled and focused. 1312 * 1313 * @see #PRESSED_STATE_SET 1314 * @see #ENABLED_STATE_SET 1315 * @see #FOCUSED_STATE_SET 1316 */ 1317 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1318 /** 1319 * Indicates the view is pressed, enabled, focused and its window has the 1320 * focus. 1321 * 1322 * @see #PRESSED_STATE_SET 1323 * @see #ENABLED_STATE_SET 1324 * @see #FOCUSED_STATE_SET 1325 * @see #WINDOW_FOCUSED_STATE_SET 1326 */ 1327 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1328 /** 1329 * Indicates the view is pressed, enabled, focused and selected. 1330 * 1331 * @see #PRESSED_STATE_SET 1332 * @see #ENABLED_STATE_SET 1333 * @see #SELECTED_STATE_SET 1334 * @see #FOCUSED_STATE_SET 1335 */ 1336 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1337 /** 1338 * Indicates the view is pressed, enabled, focused, selected and its window 1339 * has the focus. 1340 * 1341 * @see #PRESSED_STATE_SET 1342 * @see #ENABLED_STATE_SET 1343 * @see #SELECTED_STATE_SET 1344 * @see #FOCUSED_STATE_SET 1345 * @see #WINDOW_FOCUSED_STATE_SET 1346 */ 1347 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1348 1349 /** 1350 * The order here is very important to {@link #getDrawableState()} 1351 */ 1352 private static final int[][] VIEW_STATE_SETS; 1353 1354 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1355 static final int VIEW_STATE_SELECTED = 1 << 1; 1356 static final int VIEW_STATE_FOCUSED = 1 << 2; 1357 static final int VIEW_STATE_ENABLED = 1 << 3; 1358 static final int VIEW_STATE_PRESSED = 1 << 4; 1359 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1360 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1361 static final int VIEW_STATE_HOVERED = 1 << 7; 1362 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1363 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1364 1365 static final int[] VIEW_STATE_IDS = new int[] { 1366 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1367 R.attr.state_selected, VIEW_STATE_SELECTED, 1368 R.attr.state_focused, VIEW_STATE_FOCUSED, 1369 R.attr.state_enabled, VIEW_STATE_ENABLED, 1370 R.attr.state_pressed, VIEW_STATE_PRESSED, 1371 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1372 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1373 R.attr.state_hovered, VIEW_STATE_HOVERED, 1374 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1375 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1376 }; 1377 1378 static { 1379 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1380 throw new IllegalStateException( 1381 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1382 } 1383 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1384 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1385 int viewState = R.styleable.ViewDrawableStates[i]; 1386 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1387 if (VIEW_STATE_IDS[j] == viewState) { 1388 orderedIds[i * 2] = viewState; 1389 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1390 } 1391 } 1392 } 1393 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1394 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1395 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1396 int numBits = Integer.bitCount(i); 1397 int[] set = new int[numBits]; 1398 int pos = 0; 1399 for (int j = 0; j < orderedIds.length; j += 2) { 1400 if ((i & orderedIds[j+1]) != 0) { 1401 set[pos++] = orderedIds[j]; 1402 } 1403 } 1404 VIEW_STATE_SETS[i] = set; 1405 } 1406 1407 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1408 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1409 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1410 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1412 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1413 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1415 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1417 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1419 | VIEW_STATE_FOCUSED]; 1420 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1421 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1423 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1425 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1427 | VIEW_STATE_ENABLED]; 1428 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1429 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1430 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1431 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1432 | VIEW_STATE_ENABLED]; 1433 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1434 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1435 | VIEW_STATE_ENABLED]; 1436 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1437 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1438 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1439 1440 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1441 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1443 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1445 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1447 | VIEW_STATE_PRESSED]; 1448 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1449 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1450 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1452 | VIEW_STATE_PRESSED]; 1453 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1455 | VIEW_STATE_PRESSED]; 1456 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1457 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1458 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1459 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1461 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1463 | VIEW_STATE_PRESSED]; 1464 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1466 | VIEW_STATE_PRESSED]; 1467 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1468 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1469 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1470 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1471 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1472 | VIEW_STATE_PRESSED]; 1473 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1475 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1476 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1477 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1478 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1479 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1481 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1482 | VIEW_STATE_PRESSED]; 1483 } 1484 1485 /** 1486 * Accessibility event types that are dispatched for text population. 1487 */ 1488 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1489 AccessibilityEvent.TYPE_VIEW_CLICKED 1490 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1491 | AccessibilityEvent.TYPE_VIEW_SELECTED 1492 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1493 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1494 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1495 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1496 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1497 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1498 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1499 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1500 1501 /** 1502 * Temporary Rect currently for use in setBackground(). This will probably 1503 * be extended in the future to hold our own class with more than just 1504 * a Rect. :) 1505 */ 1506 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1507 1508 /** 1509 * Map used to store views' tags. 1510 */ 1511 private SparseArray<Object> mKeyedTags; 1512 1513 /** 1514 * The next available accessibility id. 1515 */ 1516 private static int sNextAccessibilityViewId; 1517 1518 /** 1519 * The animation currently associated with this view. 1520 * @hide 1521 */ 1522 protected Animation mCurrentAnimation = null; 1523 1524 /** 1525 * Width as measured during measure pass. 1526 * {@hide} 1527 */ 1528 @ViewDebug.ExportedProperty(category = "measurement") 1529 int mMeasuredWidth; 1530 1531 /** 1532 * Height as measured during measure pass. 1533 * {@hide} 1534 */ 1535 @ViewDebug.ExportedProperty(category = "measurement") 1536 int mMeasuredHeight; 1537 1538 /** 1539 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1540 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1541 * its display list. This flag, used only when hw accelerated, allows us to clear the 1542 * flag while retaining this information until it's needed (at getDisplayList() time and 1543 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1544 * 1545 * {@hide} 1546 */ 1547 boolean mRecreateDisplayList = false; 1548 1549 /** 1550 * The view's identifier. 1551 * {@hide} 1552 * 1553 * @see #setId(int) 1554 * @see #getId() 1555 */ 1556 @ViewDebug.ExportedProperty(resolveId = true) 1557 int mID = NO_ID; 1558 1559 /** 1560 * The stable ID of this view for accessibility purposes. 1561 */ 1562 int mAccessibilityViewId = NO_ID; 1563 1564 private int mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 1565 1566 /** 1567 * The view's tag. 1568 * {@hide} 1569 * 1570 * @see #setTag(Object) 1571 * @see #getTag() 1572 */ 1573 protected Object mTag; 1574 1575 // for mPrivateFlags: 1576 /** {@hide} */ 1577 static final int PFLAG_WANTS_FOCUS = 0x00000001; 1578 /** {@hide} */ 1579 static final int PFLAG_FOCUSED = 0x00000002; 1580 /** {@hide} */ 1581 static final int PFLAG_SELECTED = 0x00000004; 1582 /** {@hide} */ 1583 static final int PFLAG_IS_ROOT_NAMESPACE = 0x00000008; 1584 /** {@hide} */ 1585 static final int PFLAG_HAS_BOUNDS = 0x00000010; 1586 /** {@hide} */ 1587 static final int PFLAG_DRAWN = 0x00000020; 1588 /** 1589 * When this flag is set, this view is running an animation on behalf of its 1590 * children and should therefore not cancel invalidate requests, even if they 1591 * lie outside of this view's bounds. 1592 * 1593 * {@hide} 1594 */ 1595 static final int PFLAG_DRAW_ANIMATION = 0x00000040; 1596 /** {@hide} */ 1597 static final int PFLAG_SKIP_DRAW = 0x00000080; 1598 /** {@hide} */ 1599 static final int PFLAG_ONLY_DRAWS_BACKGROUND = 0x00000100; 1600 /** {@hide} */ 1601 static final int PFLAG_REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1602 /** {@hide} */ 1603 static final int PFLAG_DRAWABLE_STATE_DIRTY = 0x00000400; 1604 /** {@hide} */ 1605 static final int PFLAG_MEASURED_DIMENSION_SET = 0x00000800; 1606 /** {@hide} */ 1607 static final int PFLAG_FORCE_LAYOUT = 0x00001000; 1608 /** {@hide} */ 1609 static final int PFLAG_LAYOUT_REQUIRED = 0x00002000; 1610 1611 private static final int PFLAG_PRESSED = 0x00004000; 1612 1613 /** {@hide} */ 1614 static final int PFLAG_DRAWING_CACHE_VALID = 0x00008000; 1615 /** 1616 * Flag used to indicate that this view should be drawn once more (and only once 1617 * more) after its animation has completed. 1618 * {@hide} 1619 */ 1620 static final int PFLAG_ANIMATION_STARTED = 0x00010000; 1621 1622 private static final int PFLAG_SAVE_STATE_CALLED = 0x00020000; 1623 1624 /** 1625 * Indicates that the View returned true when onSetAlpha() was called and that 1626 * the alpha must be restored. 1627 * {@hide} 1628 */ 1629 static final int PFLAG_ALPHA_SET = 0x00040000; 1630 1631 /** 1632 * Set by {@link #setScrollContainer(boolean)}. 1633 */ 1634 static final int PFLAG_SCROLL_CONTAINER = 0x00080000; 1635 1636 /** 1637 * Set by {@link #setScrollContainer(boolean)}. 1638 */ 1639 static final int PFLAG_SCROLL_CONTAINER_ADDED = 0x00100000; 1640 1641 /** 1642 * View flag indicating whether this view was invalidated (fully or partially.) 1643 * 1644 * @hide 1645 */ 1646 static final int PFLAG_DIRTY = 0x00200000; 1647 1648 /** 1649 * View flag indicating whether this view was invalidated by an opaque 1650 * invalidate request. 1651 * 1652 * @hide 1653 */ 1654 static final int PFLAG_DIRTY_OPAQUE = 0x00400000; 1655 1656 /** 1657 * Mask for {@link #PFLAG_DIRTY} and {@link #PFLAG_DIRTY_OPAQUE}. 1658 * 1659 * @hide 1660 */ 1661 static final int PFLAG_DIRTY_MASK = 0x00600000; 1662 1663 /** 1664 * Indicates whether the background is opaque. 1665 * 1666 * @hide 1667 */ 1668 static final int PFLAG_OPAQUE_BACKGROUND = 0x00800000; 1669 1670 /** 1671 * Indicates whether the scrollbars are opaque. 1672 * 1673 * @hide 1674 */ 1675 static final int PFLAG_OPAQUE_SCROLLBARS = 0x01000000; 1676 1677 /** 1678 * Indicates whether the view is opaque. 1679 * 1680 * @hide 1681 */ 1682 static final int PFLAG_OPAQUE_MASK = 0x01800000; 1683 1684 /** 1685 * Indicates a prepressed state; 1686 * the short time between ACTION_DOWN and recognizing 1687 * a 'real' press. Prepressed is used to recognize quick taps 1688 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1689 * 1690 * @hide 1691 */ 1692 private static final int PFLAG_PREPRESSED = 0x02000000; 1693 1694 /** 1695 * Indicates whether the view is temporarily detached. 1696 * 1697 * @hide 1698 */ 1699 static final int PFLAG_CANCEL_NEXT_UP_EVENT = 0x04000000; 1700 1701 /** 1702 * Indicates that we should awaken scroll bars once attached 1703 * 1704 * @hide 1705 */ 1706 private static final int PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1707 1708 /** 1709 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1710 * @hide 1711 */ 1712 private static final int PFLAG_HOVERED = 0x10000000; 1713 1714 /** 1715 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1716 * for transform operations 1717 * 1718 * @hide 1719 */ 1720 private static final int PFLAG_PIVOT_EXPLICITLY_SET = 0x20000000; 1721 1722 /** {@hide} */ 1723 static final int PFLAG_ACTIVATED = 0x40000000; 1724 1725 /** 1726 * Indicates that this view was specifically invalidated, not just dirtied because some 1727 * child view was invalidated. The flag is used to determine when we need to recreate 1728 * a view's display list (as opposed to just returning a reference to its existing 1729 * display list). 1730 * 1731 * @hide 1732 */ 1733 static final int PFLAG_INVALIDATED = 0x80000000; 1734 1735 /** 1736 * Masks for mPrivateFlags2, as generated by dumpFlags(): 1737 * 1738 * -------|-------|-------|-------| 1739 * PFLAG2_TEXT_ALIGNMENT_FLAGS[0] 1740 * PFLAG2_TEXT_DIRECTION_FLAGS[0] 1741 * 1 PFLAG2_DRAG_CAN_ACCEPT 1742 * 1 PFLAG2_DRAG_HOVERED 1743 * 1 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT 1744 * 11 PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1745 * 1 1 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT 1746 * 11 PFLAG2_LAYOUT_DIRECTION_MASK 1747 * 11 1 PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 1748 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL 1749 * 1 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT 1750 * 1 1 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT 1751 * 1 PFLAG2_LAYOUT_DIRECTION_RESOLVED 1752 * 11 PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK 1753 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[1] 1754 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[2] 1755 * 11 PFLAG2_TEXT_DIRECTION_FLAGS[3] 1756 * 1 PFLAG2_TEXT_DIRECTION_FLAGS[4] 1757 * 1 1 PFLAG2_TEXT_DIRECTION_FLAGS[5] 1758 * 111 PFLAG2_TEXT_DIRECTION_MASK 1759 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED 1760 * 1 PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT 1761 * 111 PFLAG2_TEXT_DIRECTION_RESOLVED_MASK 1762 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[1] 1763 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[2] 1764 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[3] 1765 * 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[4] 1766 * 1 1 PFLAG2_TEXT_ALIGNMENT_FLAGS[5] 1767 * 11 PFLAG2_TEXT_ALIGNMENT_FLAGS[6] 1768 * 111 PFLAG2_TEXT_ALIGNMENT_MASK 1769 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED 1770 * 1 PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT 1771 * 111 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK 1772 * 11 PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK 1773 * 1 PFLAG2_HAS_TRANSIENT_STATE 1774 * 1 PFLAG2_ACCESSIBILITY_FOCUSED 1775 * 1 PFLAG2_ACCESSIBILITY_STATE_CHANGED 1776 * 1 PFLAG2_VIEW_QUICK_REJECTED 1777 * 1 PFLAG2_PADDING_RESOLVED 1778 * -------|-------|-------|-------| 1779 */ 1780 1781 /** 1782 * Indicates that this view has reported that it can accept the current drag's content. 1783 * Cleared when the drag operation concludes. 1784 * @hide 1785 */ 1786 static final int PFLAG2_DRAG_CAN_ACCEPT = 0x00000001; 1787 1788 /** 1789 * Indicates that this view is currently directly under the drag location in a 1790 * drag-and-drop operation involving content that it can accept. Cleared when 1791 * the drag exits the view, or when the drag operation concludes. 1792 * @hide 1793 */ 1794 static final int PFLAG2_DRAG_HOVERED = 0x00000002; 1795 1796 /** 1797 * Horizontal layout direction of this view is from Left to Right. 1798 * Use with {@link #setLayoutDirection}. 1799 */ 1800 public static final int LAYOUT_DIRECTION_LTR = 0; 1801 1802 /** 1803 * Horizontal layout direction of this view is from Right to Left. 1804 * Use with {@link #setLayoutDirection}. 1805 */ 1806 public static final int LAYOUT_DIRECTION_RTL = 1; 1807 1808 /** 1809 * Horizontal layout direction of this view is inherited from its parent. 1810 * Use with {@link #setLayoutDirection}. 1811 */ 1812 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1813 1814 /** 1815 * Horizontal layout direction of this view is from deduced from the default language 1816 * script for the locale. Use with {@link #setLayoutDirection}. 1817 */ 1818 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1819 1820 /** 1821 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1822 * @hide 1823 */ 1824 static final int PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT = 2; 1825 1826 /** 1827 * Mask for use with private flags indicating bits used for horizontal layout direction. 1828 * @hide 1829 */ 1830 static final int PFLAG2_LAYOUT_DIRECTION_MASK = 0x00000003 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1831 1832 /** 1833 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1834 * right-to-left direction. 1835 * @hide 1836 */ 1837 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL = 4 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1838 1839 /** 1840 * Indicates whether the view horizontal layout direction has been resolved. 1841 * @hide 1842 */ 1843 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED = 8 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1844 1845 /** 1846 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1847 * @hide 1848 */ 1849 static final int PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C 1850 << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 1851 1852 /* 1853 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1854 * flag value. 1855 * @hide 1856 */ 1857 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1858 LAYOUT_DIRECTION_LTR, 1859 LAYOUT_DIRECTION_RTL, 1860 LAYOUT_DIRECTION_INHERIT, 1861 LAYOUT_DIRECTION_LOCALE 1862 }; 1863 1864 /** 1865 * Default horizontal layout direction. 1866 */ 1867 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1868 1869 /** 1870 * Default horizontal layout direction. 1871 * @hide 1872 */ 1873 static final int LAYOUT_DIRECTION_RESOLVED_DEFAULT = LAYOUT_DIRECTION_LTR; 1874 1875 /** 1876 * Indicates that the view is tracking some sort of transient state 1877 * that the app should not need to be aware of, but that the framework 1878 * should take special care to preserve. 1879 * 1880 * @hide 1881 */ 1882 static final int PFLAG2_HAS_TRANSIENT_STATE = 0x1 << 22; 1883 1884 /** 1885 * Text direction is inherited thru {@link ViewGroup} 1886 */ 1887 public static final int TEXT_DIRECTION_INHERIT = 0; 1888 1889 /** 1890 * Text direction is using "first strong algorithm". The first strong directional character 1891 * determines the paragraph direction. If there is no strong directional character, the 1892 * paragraph direction is the view's resolved layout direction. 1893 */ 1894 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1895 1896 /** 1897 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1898 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1899 * If there are neither, the paragraph direction is the view's resolved layout direction. 1900 */ 1901 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1902 1903 /** 1904 * Text direction is forced to LTR. 1905 */ 1906 public static final int TEXT_DIRECTION_LTR = 3; 1907 1908 /** 1909 * Text direction is forced to RTL. 1910 */ 1911 public static final int TEXT_DIRECTION_RTL = 4; 1912 1913 /** 1914 * Text direction is coming from the system Locale. 1915 */ 1916 public static final int TEXT_DIRECTION_LOCALE = 5; 1917 1918 /** 1919 * Default text direction is inherited 1920 */ 1921 private static final int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1922 1923 /** 1924 * Default resolved text direction 1925 * @hide 1926 */ 1927 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = TEXT_DIRECTION_FIRST_STRONG; 1928 1929 /** 1930 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1931 * @hide 1932 */ 1933 static final int PFLAG2_TEXT_DIRECTION_MASK_SHIFT = 6; 1934 1935 /** 1936 * Mask for use with private flags indicating bits used for text direction. 1937 * @hide 1938 */ 1939 static final int PFLAG2_TEXT_DIRECTION_MASK = 0x00000007 1940 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1941 1942 /** 1943 * Array of text direction flags for mapping attribute "textDirection" to correct 1944 * flag value. 1945 * @hide 1946 */ 1947 private static final int[] PFLAG2_TEXT_DIRECTION_FLAGS = { 1948 TEXT_DIRECTION_INHERIT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1949 TEXT_DIRECTION_FIRST_STRONG << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1950 TEXT_DIRECTION_ANY_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1951 TEXT_DIRECTION_LTR << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1952 TEXT_DIRECTION_RTL << PFLAG2_TEXT_DIRECTION_MASK_SHIFT, 1953 TEXT_DIRECTION_LOCALE << PFLAG2_TEXT_DIRECTION_MASK_SHIFT 1954 }; 1955 1956 /** 1957 * Indicates whether the view text direction has been resolved. 1958 * @hide 1959 */ 1960 static final int PFLAG2_TEXT_DIRECTION_RESOLVED = 0x00000008 1961 << PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 1962 1963 /** 1964 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1965 * @hide 1966 */ 1967 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1968 1969 /** 1970 * Mask for use with private flags indicating bits used for resolved text direction. 1971 * @hide 1972 */ 1973 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 1974 << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1975 1976 /** 1977 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1978 * @hide 1979 */ 1980 static final int PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT = 1981 TEXT_DIRECTION_RESOLVED_DEFAULT << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1982 1983 /* 1984 * Default text alignment. The text alignment of this View is inherited from its parent. 1985 * Use with {@link #setTextAlignment(int)} 1986 */ 1987 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1988 1989 /** 1990 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1991 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1992 * 1993 * Use with {@link #setTextAlignment(int)} 1994 */ 1995 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1996 1997 /** 1998 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1999 * 2000 * Use with {@link #setTextAlignment(int)} 2001 */ 2002 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 2003 2004 /** 2005 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 2006 * 2007 * Use with {@link #setTextAlignment(int)} 2008 */ 2009 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2010 2011 /** 2012 * Center the paragraph, e.g. ALIGN_CENTER. 2013 * 2014 * Use with {@link #setTextAlignment(int)} 2015 */ 2016 public static final int TEXT_ALIGNMENT_CENTER = 4; 2017 2018 /** 2019 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2020 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2021 * 2022 * Use with {@link #setTextAlignment(int)} 2023 */ 2024 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2025 2026 /** 2027 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2028 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2029 * 2030 * Use with {@link #setTextAlignment(int)} 2031 */ 2032 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2033 2034 /** 2035 * Default text alignment is inherited 2036 */ 2037 private static final int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2038 2039 /** 2040 * Default resolved text alignment 2041 * @hide 2042 */ 2043 static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2044 2045 /** 2046 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2047 * @hide 2048 */ 2049 static final int PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT = 13; 2050 2051 /** 2052 * Mask for use with private flags indicating bits used for text alignment. 2053 * @hide 2054 */ 2055 static final int PFLAG2_TEXT_ALIGNMENT_MASK = 0x00000007 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2056 2057 /** 2058 * Array of text direction flags for mapping attribute "textAlignment" to correct 2059 * flag value. 2060 * @hide 2061 */ 2062 private static final int[] PFLAG2_TEXT_ALIGNMENT_FLAGS = { 2063 TEXT_ALIGNMENT_INHERIT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2064 TEXT_ALIGNMENT_GRAVITY << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2065 TEXT_ALIGNMENT_TEXT_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2066 TEXT_ALIGNMENT_TEXT_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2067 TEXT_ALIGNMENT_CENTER << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2068 TEXT_ALIGNMENT_VIEW_START << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT, 2069 TEXT_ALIGNMENT_VIEW_END << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT 2070 }; 2071 2072 /** 2073 * Indicates whether the view text alignment has been resolved. 2074 * @hide 2075 */ 2076 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED = 0x00000008 << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 2077 2078 /** 2079 * Bit shift to get the resolved text alignment. 2080 * @hide 2081 */ 2082 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2083 2084 /** 2085 * Mask for use with private flags indicating bits used for text alignment. 2086 * @hide 2087 */ 2088 static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 2089 << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2090 2091 /** 2092 * Indicates whether if the view text alignment has been resolved to gravity 2093 */ 2094 private static final int PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2095 TEXT_ALIGNMENT_RESOLVED_DEFAULT << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2096 2097 // Accessiblity constants for mPrivateFlags2 2098 2099 /** 2100 * Shift for the bits in {@link #mPrivateFlags2} related to the 2101 * "importantForAccessibility" attribute. 2102 */ 2103 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2104 2105 /** 2106 * Automatically determine whether a view is important for accessibility. 2107 */ 2108 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2109 2110 /** 2111 * The view is important for accessibility. 2112 */ 2113 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2114 2115 /** 2116 * The view is not important for accessibility. 2117 */ 2118 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2119 2120 /** 2121 * The default whether the view is important for accessibility. 2122 */ 2123 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2124 2125 /** 2126 * Mask for obtainig the bits which specify how to determine 2127 * whether a view is important for accessibility. 2128 */ 2129 static final int PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2130 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2131 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2132 2133 /** 2134 * Flag indicating whether a view has accessibility focus. 2135 */ 2136 static final int PFLAG2_ACCESSIBILITY_FOCUSED = 0x00000040 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2137 2138 /** 2139 * Flag indicating whether a view state for accessibility has changed. 2140 */ 2141 static final int PFLAG2_ACCESSIBILITY_STATE_CHANGED = 0x00000080 2142 << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2143 2144 /** 2145 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2146 * is used to check whether later changes to the view's transform should invalidate the 2147 * view to force the quickReject test to run again. 2148 */ 2149 static final int PFLAG2_VIEW_QUICK_REJECTED = 0x10000000; 2150 2151 /** 2152 * Flag indicating that start/end padding has been resolved into left/right padding 2153 * for use in measurement, layout, drawing, etc. This is set by {@link #resolvePadding()} 2154 * and checked by {@link #measure(int, int)} to determine if padding needs to be resolved 2155 * during measurement. In some special cases this is required such as when an adapter-based 2156 * view measures prospective children without attaching them to a window. 2157 */ 2158 static final int PFLAG2_PADDING_RESOLVED = 0x20000000; 2159 2160 /** 2161 * Flag indicating that the start/end drawables has been resolved into left/right ones. 2162 */ 2163 static final int PFLAG2_DRAWABLE_RESOLVED = 0x40000000; 2164 2165 /** 2166 * Group of bits indicating that RTL properties resolution is done. 2167 */ 2168 static final int ALL_RTL_PROPERTIES_RESOLVED = PFLAG2_LAYOUT_DIRECTION_RESOLVED | 2169 PFLAG2_TEXT_DIRECTION_RESOLVED | 2170 PFLAG2_TEXT_ALIGNMENT_RESOLVED | 2171 PFLAG2_PADDING_RESOLVED | 2172 PFLAG2_DRAWABLE_RESOLVED; 2173 2174 // There are a couple of flags left in mPrivateFlags2 2175 2176 /* End of masks for mPrivateFlags2 */ 2177 2178 /* Masks for mPrivateFlags3 */ 2179 2180 /** 2181 * Flag indicating that view has a transform animation set on it. This is used to track whether 2182 * an animation is cleared between successive frames, in order to tell the associated 2183 * DisplayList to clear its animation matrix. 2184 */ 2185 static final int PFLAG3_VIEW_IS_ANIMATING_TRANSFORM = 0x1; 2186 2187 /** 2188 * Flag indicating that view has an alpha animation set on it. This is used to track whether an 2189 * animation is cleared between successive frames, in order to tell the associated 2190 * DisplayList to restore its alpha value. 2191 */ 2192 static final int PFLAG3_VIEW_IS_ANIMATING_ALPHA = 0x2; 2193 2194 2195 /* End of masks for mPrivateFlags3 */ 2196 2197 static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT | PFLAG2_DRAG_HOVERED; 2198 2199 /** 2200 * Always allow a user to over-scroll this view, provided it is a 2201 * view that can scroll. 2202 * 2203 * @see #getOverScrollMode() 2204 * @see #setOverScrollMode(int) 2205 */ 2206 public static final int OVER_SCROLL_ALWAYS = 0; 2207 2208 /** 2209 * Allow a user to over-scroll this view only if the content is large 2210 * enough to meaningfully scroll, provided it is a view that can scroll. 2211 * 2212 * @see #getOverScrollMode() 2213 * @see #setOverScrollMode(int) 2214 */ 2215 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2216 2217 /** 2218 * Never allow a user to over-scroll this view. 2219 * 2220 * @see #getOverScrollMode() 2221 * @see #setOverScrollMode(int) 2222 */ 2223 public static final int OVER_SCROLL_NEVER = 2; 2224 2225 /** 2226 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2227 * requested the system UI (status bar) to be visible (the default). 2228 * 2229 * @see #setSystemUiVisibility(int) 2230 */ 2231 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2232 2233 /** 2234 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2235 * system UI to enter an unobtrusive "low profile" mode. 2236 * 2237 * <p>This is for use in games, book readers, video players, or any other 2238 * "immersive" application where the usual system chrome is deemed too distracting. 2239 * 2240 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2241 * 2242 * @see #setSystemUiVisibility(int) 2243 */ 2244 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2245 2246 /** 2247 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2248 * system navigation be temporarily hidden. 2249 * 2250 * <p>This is an even less obtrusive state than that called for by 2251 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2252 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2253 * those to disappear. This is useful (in conjunction with the 2254 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2255 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2256 * window flags) for displaying content using every last pixel on the display. 2257 * 2258 * <p>There is a limitation: because navigation controls are so important, the least user 2259 * interaction will cause them to reappear immediately. When this happens, both 2260 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2261 * so that both elements reappear at the same time. 2262 * 2263 * @see #setSystemUiVisibility(int) 2264 */ 2265 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2266 2267 /** 2268 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2269 * into the normal fullscreen mode so that its content can take over the screen 2270 * while still allowing the user to interact with the application. 2271 * 2272 * <p>This has the same visual effect as 2273 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2274 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2275 * meaning that non-critical screen decorations (such as the status bar) will be 2276 * hidden while the user is in the View's window, focusing the experience on 2277 * that content. Unlike the window flag, if you are using ActionBar in 2278 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2279 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2280 * hide the action bar. 2281 * 2282 * <p>This approach to going fullscreen is best used over the window flag when 2283 * it is a transient state -- that is, the application does this at certain 2284 * points in its user interaction where it wants to allow the user to focus 2285 * on content, but not as a continuous state. For situations where the application 2286 * would like to simply stay full screen the entire time (such as a game that 2287 * wants to take over the screen), the 2288 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2289 * is usually a better approach. The state set here will be removed by the system 2290 * in various situations (such as the user moving to another application) like 2291 * the other system UI states. 2292 * 2293 * <p>When using this flag, the application should provide some easy facility 2294 * for the user to go out of it. A common example would be in an e-book 2295 * reader, where tapping on the screen brings back whatever screen and UI 2296 * decorations that had been hidden while the user was immersed in reading 2297 * the book. 2298 * 2299 * @see #setSystemUiVisibility(int) 2300 */ 2301 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2302 2303 /** 2304 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2305 * flags, we would like a stable view of the content insets given to 2306 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2307 * will always represent the worst case that the application can expect 2308 * as a continuous state. In the stock Android UI this is the space for 2309 * the system bar, nav bar, and status bar, but not more transient elements 2310 * such as an input method. 2311 * 2312 * The stable layout your UI sees is based on the system UI modes you can 2313 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2314 * then you will get a stable layout for changes of the 2315 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2316 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2317 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2318 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2319 * with a stable layout. (Note that you should avoid using 2320 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2321 * 2322 * If you have set the window flag {@link WindowManager.LayoutParams#FLAG_FULLSCREEN} 2323 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2324 * then a hidden status bar will be considered a "stable" state for purposes 2325 * here. This allows your UI to continually hide the status bar, while still 2326 * using the system UI flags to hide the action bar while still retaining 2327 * a stable layout. Note that changing the window fullscreen flag will never 2328 * provide a stable layout for a clean transition. 2329 * 2330 * <p>If you are using ActionBar in 2331 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2332 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2333 * insets it adds to those given to the application. 2334 */ 2335 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2336 2337 /** 2338 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2339 * to be layed out as if it has requested 2340 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2341 * allows it to avoid artifacts when switching in and out of that mode, at 2342 * the expense that some of its user interface may be covered by screen 2343 * decorations when they are shown. You can perform layout of your inner 2344 * UI elements to account for the navagation system UI through the 2345 * {@link #fitSystemWindows(Rect)} method. 2346 */ 2347 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2348 2349 /** 2350 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2351 * to be layed out as if it has requested 2352 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2353 * allows it to avoid artifacts when switching in and out of that mode, at 2354 * the expense that some of its user interface may be covered by screen 2355 * decorations when they are shown. You can perform layout of your inner 2356 * UI elements to account for non-fullscreen system UI through the 2357 * {@link #fitSystemWindows(Rect)} method. 2358 */ 2359 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2360 2361 /** 2362 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2363 */ 2364 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2365 2366 /** 2367 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2368 */ 2369 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2370 2371 /** 2372 * @hide 2373 * 2374 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2375 * out of the public fields to keep the undefined bits out of the developer's way. 2376 * 2377 * Flag to make the status bar not expandable. Unless you also 2378 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2379 */ 2380 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2381 2382 /** 2383 * @hide 2384 * 2385 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2386 * out of the public fields to keep the undefined bits out of the developer's way. 2387 * 2388 * Flag to hide notification icons and scrolling ticker text. 2389 */ 2390 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2391 2392 /** 2393 * @hide 2394 * 2395 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2396 * out of the public fields to keep the undefined bits out of the developer's way. 2397 * 2398 * Flag to disable incoming notification alerts. This will not block 2399 * icons, but it will block sound, vibrating and other visual or aural notifications. 2400 */ 2401 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2402 2403 /** 2404 * @hide 2405 * 2406 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2407 * out of the public fields to keep the undefined bits out of the developer's way. 2408 * 2409 * Flag to hide only the scrolling ticker. Note that 2410 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2411 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2412 */ 2413 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2414 2415 /** 2416 * @hide 2417 * 2418 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2419 * out of the public fields to keep the undefined bits out of the developer's way. 2420 * 2421 * Flag to hide the center system info area. 2422 */ 2423 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2424 2425 /** 2426 * @hide 2427 * 2428 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2429 * out of the public fields to keep the undefined bits out of the developer's way. 2430 * 2431 * Flag to hide only the home button. Don't use this 2432 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2433 */ 2434 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2435 2436 /** 2437 * @hide 2438 * 2439 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2440 * out of the public fields to keep the undefined bits out of the developer's way. 2441 * 2442 * Flag to hide only the back button. Don't use this 2443 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2444 */ 2445 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2446 2447 /** 2448 * @hide 2449 * 2450 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2451 * out of the public fields to keep the undefined bits out of the developer's way. 2452 * 2453 * Flag to hide only the clock. You might use this if your activity has 2454 * its own clock making the status bar's clock redundant. 2455 */ 2456 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2457 2458 /** 2459 * @hide 2460 * 2461 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2462 * out of the public fields to keep the undefined bits out of the developer's way. 2463 * 2464 * Flag to hide only the recent apps button. Don't use this 2465 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2466 */ 2467 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2468 2469 /** 2470 * @hide 2471 * 2472 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2473 * out of the public fields to keep the undefined bits out of the developer's way. 2474 * 2475 * Flag to disable the global search gesture. Don't use this 2476 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2477 */ 2478 public static final int STATUS_BAR_DISABLE_SEARCH = 0x02000000; 2479 2480 /** 2481 * @hide 2482 */ 2483 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2484 2485 /** 2486 * These are the system UI flags that can be cleared by events outside 2487 * of an application. Currently this is just the ability to tap on the 2488 * screen while hiding the navigation bar to have it return. 2489 * @hide 2490 */ 2491 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2492 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2493 | SYSTEM_UI_FLAG_FULLSCREEN; 2494 2495 /** 2496 * Flags that can impact the layout in relation to system UI. 2497 */ 2498 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2499 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2500 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2501 2502 /** 2503 * Find views that render the specified text. 2504 * 2505 * @see #findViewsWithText(ArrayList, CharSequence, int) 2506 */ 2507 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2508 2509 /** 2510 * Find find views that contain the specified content description. 2511 * 2512 * @see #findViewsWithText(ArrayList, CharSequence, int) 2513 */ 2514 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2515 2516 /** 2517 * Find views that contain {@link AccessibilityNodeProvider}. Such 2518 * a View is a root of virtual view hierarchy and may contain the searched 2519 * text. If this flag is set Views with providers are automatically 2520 * added and it is a responsibility of the client to call the APIs of 2521 * the provider to determine whether the virtual tree rooted at this View 2522 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2523 * represeting the virtual views with this text. 2524 * 2525 * @see #findViewsWithText(ArrayList, CharSequence, int) 2526 * 2527 * @hide 2528 */ 2529 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2530 2531 /** 2532 * The undefined cursor position. 2533 * 2534 * @hide 2535 */ 2536 public static final int ACCESSIBILITY_CURSOR_POSITION_UNDEFINED = -1; 2537 2538 /** 2539 * Indicates that the screen has changed state and is now off. 2540 * 2541 * @see #onScreenStateChanged(int) 2542 */ 2543 public static final int SCREEN_STATE_OFF = 0x0; 2544 2545 /** 2546 * Indicates that the screen has changed state and is now on. 2547 * 2548 * @see #onScreenStateChanged(int) 2549 */ 2550 public static final int SCREEN_STATE_ON = 0x1; 2551 2552 /** 2553 * Controls the over-scroll mode for this view. 2554 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2555 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2556 * and {@link #OVER_SCROLL_NEVER}. 2557 */ 2558 private int mOverScrollMode; 2559 2560 /** 2561 * The parent this view is attached to. 2562 * {@hide} 2563 * 2564 * @see #getParent() 2565 */ 2566 protected ViewParent mParent; 2567 2568 /** 2569 * {@hide} 2570 */ 2571 AttachInfo mAttachInfo; 2572 2573 /** 2574 * {@hide} 2575 */ 2576 @ViewDebug.ExportedProperty(flagMapping = { 2577 @ViewDebug.FlagToString(mask = PFLAG_FORCE_LAYOUT, equals = PFLAG_FORCE_LAYOUT, 2578 name = "FORCE_LAYOUT"), 2579 @ViewDebug.FlagToString(mask = PFLAG_LAYOUT_REQUIRED, equals = PFLAG_LAYOUT_REQUIRED, 2580 name = "LAYOUT_REQUIRED"), 2581 @ViewDebug.FlagToString(mask = PFLAG_DRAWING_CACHE_VALID, equals = PFLAG_DRAWING_CACHE_VALID, 2582 name = "DRAWING_CACHE_INVALID", outputIf = false), 2583 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "DRAWN", outputIf = true), 2584 @ViewDebug.FlagToString(mask = PFLAG_DRAWN, equals = PFLAG_DRAWN, name = "NOT_DRAWN", outputIf = false), 2585 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2586 @ViewDebug.FlagToString(mask = PFLAG_DIRTY_MASK, equals = PFLAG_DIRTY, name = "DIRTY") 2587 }) 2588 int mPrivateFlags; 2589 int mPrivateFlags2; 2590 int mPrivateFlags3; 2591 2592 /** 2593 * This view's request for the visibility of the status bar. 2594 * @hide 2595 */ 2596 @ViewDebug.ExportedProperty(flagMapping = { 2597 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2598 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2599 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2600 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2601 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2602 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2603 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2604 equals = SYSTEM_UI_FLAG_VISIBLE, 2605 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2606 }) 2607 int mSystemUiVisibility; 2608 2609 /** 2610 * Reference count for transient state. 2611 * @see #setHasTransientState(boolean) 2612 */ 2613 int mTransientStateCount = 0; 2614 2615 /** 2616 * Count of how many windows this view has been attached to. 2617 */ 2618 int mWindowAttachCount; 2619 2620 /** 2621 * The layout parameters associated with this view and used by the parent 2622 * {@link android.view.ViewGroup} to determine how this view should be 2623 * laid out. 2624 * {@hide} 2625 */ 2626 protected ViewGroup.LayoutParams mLayoutParams; 2627 2628 /** 2629 * The view flags hold various views states. 2630 * {@hide} 2631 */ 2632 @ViewDebug.ExportedProperty 2633 int mViewFlags; 2634 2635 static class TransformationInfo { 2636 /** 2637 * The transform matrix for the View. This transform is calculated internally 2638 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2639 * is used by default. Do *not* use this variable directly; instead call 2640 * getMatrix(), which will automatically recalculate the matrix if necessary 2641 * to get the correct matrix based on the latest rotation and scale properties. 2642 */ 2643 private final Matrix mMatrix = new Matrix(); 2644 2645 /** 2646 * The transform matrix for the View. This transform is calculated internally 2647 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2648 * is used by default. Do *not* use this variable directly; instead call 2649 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2650 * to get the correct matrix based on the latest rotation and scale properties. 2651 */ 2652 private Matrix mInverseMatrix; 2653 2654 /** 2655 * An internal variable that tracks whether we need to recalculate the 2656 * transform matrix, based on whether the rotation or scaleX/Y properties 2657 * have changed since the matrix was last calculated. 2658 */ 2659 boolean mMatrixDirty = false; 2660 2661 /** 2662 * An internal variable that tracks whether we need to recalculate the 2663 * transform matrix, based on whether the rotation or scaleX/Y properties 2664 * have changed since the matrix was last calculated. 2665 */ 2666 private boolean mInverseMatrixDirty = true; 2667 2668 /** 2669 * A variable that tracks whether we need to recalculate the 2670 * transform matrix, based on whether the rotation or scaleX/Y properties 2671 * have changed since the matrix was last calculated. This variable 2672 * is only valid after a call to updateMatrix() or to a function that 2673 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2674 */ 2675 private boolean mMatrixIsIdentity = true; 2676 2677 /** 2678 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2679 */ 2680 private Camera mCamera = null; 2681 2682 /** 2683 * This matrix is used when computing the matrix for 3D rotations. 2684 */ 2685 private Matrix matrix3D = null; 2686 2687 /** 2688 * These prev values are used to recalculate a centered pivot point when necessary. The 2689 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2690 * set), so thes values are only used then as well. 2691 */ 2692 private int mPrevWidth = -1; 2693 private int mPrevHeight = -1; 2694 2695 /** 2696 * The degrees rotation around the vertical axis through the pivot point. 2697 */ 2698 @ViewDebug.ExportedProperty 2699 float mRotationY = 0f; 2700 2701 /** 2702 * The degrees rotation around the horizontal axis through the pivot point. 2703 */ 2704 @ViewDebug.ExportedProperty 2705 float mRotationX = 0f; 2706 2707 /** 2708 * The degrees rotation around the pivot point. 2709 */ 2710 @ViewDebug.ExportedProperty 2711 float mRotation = 0f; 2712 2713 /** 2714 * The amount of translation of the object away from its left property (post-layout). 2715 */ 2716 @ViewDebug.ExportedProperty 2717 float mTranslationX = 0f; 2718 2719 /** 2720 * The amount of translation of the object away from its top property (post-layout). 2721 */ 2722 @ViewDebug.ExportedProperty 2723 float mTranslationY = 0f; 2724 2725 /** 2726 * The amount of scale in the x direction around the pivot point. A 2727 * value of 1 means no scaling is applied. 2728 */ 2729 @ViewDebug.ExportedProperty 2730 float mScaleX = 1f; 2731 2732 /** 2733 * The amount of scale in the y direction around the pivot point. A 2734 * value of 1 means no scaling is applied. 2735 */ 2736 @ViewDebug.ExportedProperty 2737 float mScaleY = 1f; 2738 2739 /** 2740 * The x location of the point around which the view is rotated and scaled. 2741 */ 2742 @ViewDebug.ExportedProperty 2743 float mPivotX = 0f; 2744 2745 /** 2746 * The y location of the point around which the view is rotated and scaled. 2747 */ 2748 @ViewDebug.ExportedProperty 2749 float mPivotY = 0f; 2750 2751 /** 2752 * The opacity of the View. This is a value from 0 to 1, where 0 means 2753 * completely transparent and 1 means completely opaque. 2754 */ 2755 @ViewDebug.ExportedProperty 2756 float mAlpha = 1f; 2757 } 2758 2759 TransformationInfo mTransformationInfo; 2760 2761 /** 2762 * Current clip bounds. to which all drawing of this view are constrained. 2763 */ 2764 private Rect mClipBounds = null; 2765 2766 private boolean mLastIsOpaque; 2767 2768 /** 2769 * Convenience value to check for float values that are close enough to zero to be considered 2770 * zero. 2771 */ 2772 private static final float NONZERO_EPSILON = .001f; 2773 2774 /** 2775 * The distance in pixels from the left edge of this view's parent 2776 * to the left edge of this view. 2777 * {@hide} 2778 */ 2779 @ViewDebug.ExportedProperty(category = "layout") 2780 protected int mLeft; 2781 /** 2782 * The distance in pixels from the left edge of this view's parent 2783 * to the right edge of this view. 2784 * {@hide} 2785 */ 2786 @ViewDebug.ExportedProperty(category = "layout") 2787 protected int mRight; 2788 /** 2789 * The distance in pixels from the top edge of this view's parent 2790 * to the top edge of this view. 2791 * {@hide} 2792 */ 2793 @ViewDebug.ExportedProperty(category = "layout") 2794 protected int mTop; 2795 /** 2796 * The distance in pixels from the top edge of this view's parent 2797 * to the bottom edge of this view. 2798 * {@hide} 2799 */ 2800 @ViewDebug.ExportedProperty(category = "layout") 2801 protected int mBottom; 2802 2803 /** 2804 * The offset, in pixels, by which the content of this view is scrolled 2805 * horizontally. 2806 * {@hide} 2807 */ 2808 @ViewDebug.ExportedProperty(category = "scrolling") 2809 protected int mScrollX; 2810 /** 2811 * The offset, in pixels, by which the content of this view is scrolled 2812 * vertically. 2813 * {@hide} 2814 */ 2815 @ViewDebug.ExportedProperty(category = "scrolling") 2816 protected int mScrollY; 2817 2818 /** 2819 * The left padding in pixels, that is the distance in pixels between the 2820 * left edge of this view and the left edge of its content. 2821 * {@hide} 2822 */ 2823 @ViewDebug.ExportedProperty(category = "padding") 2824 protected int mPaddingLeft = 0; 2825 /** 2826 * The right padding in pixels, that is the distance in pixels between the 2827 * right edge of this view and the right edge of its content. 2828 * {@hide} 2829 */ 2830 @ViewDebug.ExportedProperty(category = "padding") 2831 protected int mPaddingRight = 0; 2832 /** 2833 * The top padding in pixels, that is the distance in pixels between the 2834 * top edge of this view and the top edge of its content. 2835 * {@hide} 2836 */ 2837 @ViewDebug.ExportedProperty(category = "padding") 2838 protected int mPaddingTop; 2839 /** 2840 * The bottom padding in pixels, that is the distance in pixels between the 2841 * bottom edge of this view and the bottom edge of its content. 2842 * {@hide} 2843 */ 2844 @ViewDebug.ExportedProperty(category = "padding") 2845 protected int mPaddingBottom; 2846 2847 /** 2848 * The layout insets in pixels, that is the distance in pixels between the 2849 * visible edges of this view its bounds. 2850 */ 2851 private Insets mLayoutInsets; 2852 2853 /** 2854 * Briefly describes the view and is primarily used for accessibility support. 2855 */ 2856 private CharSequence mContentDescription; 2857 2858 /** 2859 * Specifies the id of a view for which this view serves as a label for 2860 * accessibility purposes. 2861 */ 2862 private int mLabelForId = View.NO_ID; 2863 2864 /** 2865 * Predicate for matching labeled view id with its label for 2866 * accessibility purposes. 2867 */ 2868 private MatchLabelForPredicate mMatchLabelForPredicate; 2869 2870 /** 2871 * Predicate for matching a view by its id. 2872 */ 2873 private MatchIdPredicate mMatchIdPredicate; 2874 2875 /** 2876 * Cache the paddingRight set by the user to append to the scrollbar's size. 2877 * 2878 * @hide 2879 */ 2880 @ViewDebug.ExportedProperty(category = "padding") 2881 protected int mUserPaddingRight; 2882 2883 /** 2884 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2885 * 2886 * @hide 2887 */ 2888 @ViewDebug.ExportedProperty(category = "padding") 2889 protected int mUserPaddingBottom; 2890 2891 /** 2892 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2893 * 2894 * @hide 2895 */ 2896 @ViewDebug.ExportedProperty(category = "padding") 2897 protected int mUserPaddingLeft; 2898 2899 /** 2900 * Cache the paddingStart set by the user to append to the scrollbar's size. 2901 * 2902 */ 2903 @ViewDebug.ExportedProperty(category = "padding") 2904 int mUserPaddingStart; 2905 2906 /** 2907 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2908 * 2909 */ 2910 @ViewDebug.ExportedProperty(category = "padding") 2911 int mUserPaddingEnd; 2912 2913 /** 2914 * Cache initial left padding. 2915 * 2916 * @hide 2917 */ 2918 int mUserPaddingLeftInitial = 0; 2919 2920 /** 2921 * Cache initial right padding. 2922 * 2923 * @hide 2924 */ 2925 int mUserPaddingRightInitial = 0; 2926 2927 /** 2928 * Default undefined padding 2929 */ 2930 private static final int UNDEFINED_PADDING = Integer.MIN_VALUE; 2931 2932 /** 2933 * @hide 2934 */ 2935 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2936 /** 2937 * @hide 2938 */ 2939 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2940 2941 @ViewDebug.ExportedProperty(deepExport = true, prefix = "bg_") 2942 private Drawable mBackground; 2943 2944 private int mBackgroundResource; 2945 private boolean mBackgroundSizeChanged; 2946 2947 static class ListenerInfo { 2948 /** 2949 * Listener used to dispatch focus change events. 2950 * This field should be made private, so it is hidden from the SDK. 2951 * {@hide} 2952 */ 2953 protected OnFocusChangeListener mOnFocusChangeListener; 2954 2955 /** 2956 * Listeners for layout change events. 2957 */ 2958 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2959 2960 /** 2961 * Listeners for attach events. 2962 */ 2963 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2964 2965 /** 2966 * Listener used to dispatch click events. 2967 * This field should be made private, so it is hidden from the SDK. 2968 * {@hide} 2969 */ 2970 public OnClickListener mOnClickListener; 2971 2972 /** 2973 * Listener used to dispatch long click events. 2974 * This field should be made private, so it is hidden from the SDK. 2975 * {@hide} 2976 */ 2977 protected OnLongClickListener mOnLongClickListener; 2978 2979 /** 2980 * Listener used to build the context menu. 2981 * This field should be made private, so it is hidden from the SDK. 2982 * {@hide} 2983 */ 2984 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2985 2986 private OnKeyListener mOnKeyListener; 2987 2988 private OnTouchListener mOnTouchListener; 2989 2990 private OnHoverListener mOnHoverListener; 2991 2992 private OnGenericMotionListener mOnGenericMotionListener; 2993 2994 private OnDragListener mOnDragListener; 2995 2996 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2997 } 2998 2999 ListenerInfo mListenerInfo; 3000 3001 /** 3002 * The application environment this view lives in. 3003 * This field should be made private, so it is hidden from the SDK. 3004 * {@hide} 3005 */ 3006 protected Context mContext; 3007 3008 private final Resources mResources; 3009 3010 private ScrollabilityCache mScrollCache; 3011 3012 private int[] mDrawableState = null; 3013 3014 /** 3015 * Set to true when drawing cache is enabled and cannot be created. 3016 * 3017 * @hide 3018 */ 3019 public boolean mCachingFailed; 3020 3021 private Bitmap mDrawingCache; 3022 private Bitmap mUnscaledDrawingCache; 3023 private HardwareLayer mHardwareLayer; 3024 DisplayList mDisplayList; 3025 3026 /** 3027 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 3028 * the user may specify which view to go to next. 3029 */ 3030 private int mNextFocusLeftId = View.NO_ID; 3031 3032 /** 3033 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 3034 * the user may specify which view to go to next. 3035 */ 3036 private int mNextFocusRightId = View.NO_ID; 3037 3038 /** 3039 * When this view has focus and the next focus is {@link #FOCUS_UP}, 3040 * the user may specify which view to go to next. 3041 */ 3042 private int mNextFocusUpId = View.NO_ID; 3043 3044 /** 3045 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 3046 * the user may specify which view to go to next. 3047 */ 3048 private int mNextFocusDownId = View.NO_ID; 3049 3050 /** 3051 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 3052 * the user may specify which view to go to next. 3053 */ 3054 int mNextFocusForwardId = View.NO_ID; 3055 3056 private CheckForLongPress mPendingCheckForLongPress; 3057 private CheckForTap mPendingCheckForTap = null; 3058 private PerformClick mPerformClick; 3059 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 3060 3061 private UnsetPressedState mUnsetPressedState; 3062 3063 /** 3064 * Whether the long press's action has been invoked. The tap's action is invoked on the 3065 * up event while a long press is invoked as soon as the long press duration is reached, so 3066 * a long press could be performed before the tap is checked, in which case the tap's action 3067 * should not be invoked. 3068 */ 3069 private boolean mHasPerformedLongPress; 3070 3071 /** 3072 * The minimum height of the view. We'll try our best to have the height 3073 * of this view to at least this amount. 3074 */ 3075 @ViewDebug.ExportedProperty(category = "measurement") 3076 private int mMinHeight; 3077 3078 /** 3079 * The minimum width of the view. We'll try our best to have the width 3080 * of this view to at least this amount. 3081 */ 3082 @ViewDebug.ExportedProperty(category = "measurement") 3083 private int mMinWidth; 3084 3085 /** 3086 * The delegate to handle touch events that are physically in this view 3087 * but should be handled by another view. 3088 */ 3089 private TouchDelegate mTouchDelegate = null; 3090 3091 /** 3092 * Solid color to use as a background when creating the drawing cache. Enables 3093 * the cache to use 16 bit bitmaps instead of 32 bit. 3094 */ 3095 private int mDrawingCacheBackgroundColor = 0; 3096 3097 /** 3098 * Special tree observer used when mAttachInfo is null. 3099 */ 3100 private ViewTreeObserver mFloatingTreeObserver; 3101 3102 /** 3103 * Cache the touch slop from the context that created the view. 3104 */ 3105 private int mTouchSlop; 3106 3107 /** 3108 * Object that handles automatic animation of view properties. 3109 */ 3110 private ViewPropertyAnimator mAnimator = null; 3111 3112 /** 3113 * Flag indicating that a drag can cross window boundaries. When 3114 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3115 * with this flag set, all visible applications will be able to participate 3116 * in the drag operation and receive the dragged content. 3117 * 3118 * @hide 3119 */ 3120 public static final int DRAG_FLAG_GLOBAL = 1; 3121 3122 /** 3123 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3124 */ 3125 private float mVerticalScrollFactor; 3126 3127 /** 3128 * Position of the vertical scroll bar. 3129 */ 3130 private int mVerticalScrollbarPosition; 3131 3132 /** 3133 * Position the scroll bar at the default position as determined by the system. 3134 */ 3135 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3136 3137 /** 3138 * Position the scroll bar along the left edge. 3139 */ 3140 public static final int SCROLLBAR_POSITION_LEFT = 1; 3141 3142 /** 3143 * Position the scroll bar along the right edge. 3144 */ 3145 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3146 3147 /** 3148 * Indicates that the view does not have a layer. 3149 * 3150 * @see #getLayerType() 3151 * @see #setLayerType(int, android.graphics.Paint) 3152 * @see #LAYER_TYPE_SOFTWARE 3153 * @see #LAYER_TYPE_HARDWARE 3154 */ 3155 public static final int LAYER_TYPE_NONE = 0; 3156 3157 /** 3158 * <p>Indicates that the view has a software layer. A software layer is backed 3159 * by a bitmap and causes the view to be rendered using Android's software 3160 * rendering pipeline, even if hardware acceleration is enabled.</p> 3161 * 3162 * <p>Software layers have various usages:</p> 3163 * <p>When the application is not using hardware acceleration, a software layer 3164 * is useful to apply a specific color filter and/or blending mode and/or 3165 * translucency to a view and all its children.</p> 3166 * <p>When the application is using hardware acceleration, a software layer 3167 * is useful to render drawing primitives not supported by the hardware 3168 * accelerated pipeline. It can also be used to cache a complex view tree 3169 * into a texture and reduce the complexity of drawing operations. For instance, 3170 * when animating a complex view tree with a translation, a software layer can 3171 * be used to render the view tree only once.</p> 3172 * <p>Software layers should be avoided when the affected view tree updates 3173 * often. Every update will require to re-render the software layer, which can 3174 * potentially be slow (particularly when hardware acceleration is turned on 3175 * since the layer will have to be uploaded into a hardware texture after every 3176 * update.)</p> 3177 * 3178 * @see #getLayerType() 3179 * @see #setLayerType(int, android.graphics.Paint) 3180 * @see #LAYER_TYPE_NONE 3181 * @see #LAYER_TYPE_HARDWARE 3182 */ 3183 public static final int LAYER_TYPE_SOFTWARE = 1; 3184 3185 /** 3186 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3187 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3188 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3189 * rendering pipeline, but only if hardware acceleration is turned on for the 3190 * view hierarchy. When hardware acceleration is turned off, hardware layers 3191 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3192 * 3193 * <p>A hardware layer is useful to apply a specific color filter and/or 3194 * blending mode and/or translucency to a view and all its children.</p> 3195 * <p>A hardware layer can be used to cache a complex view tree into a 3196 * texture and reduce the complexity of drawing operations. For instance, 3197 * when animating a complex view tree with a translation, a hardware layer can 3198 * be used to render the view tree only once.</p> 3199 * <p>A hardware layer can also be used to increase the rendering quality when 3200 * rotation transformations are applied on a view. It can also be used to 3201 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3202 * 3203 * @see #getLayerType() 3204 * @see #setLayerType(int, android.graphics.Paint) 3205 * @see #LAYER_TYPE_NONE 3206 * @see #LAYER_TYPE_SOFTWARE 3207 */ 3208 public static final int LAYER_TYPE_HARDWARE = 2; 3209 3210 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3211 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3212 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3213 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3214 }) 3215 int mLayerType = LAYER_TYPE_NONE; 3216 Paint mLayerPaint; 3217 Rect mLocalDirtyRect; 3218 3219 /** 3220 * Set to true when the view is sending hover accessibility events because it 3221 * is the innermost hovered view. 3222 */ 3223 private boolean mSendingHoverAccessibilityEvents; 3224 3225 /** 3226 * Delegate for injecting accessibility functionality. 3227 */ 3228 AccessibilityDelegate mAccessibilityDelegate; 3229 3230 /** 3231 * The view's overlay layer. Developers get a reference to the overlay via getOverlay() 3232 * and add/remove objects to/from the overlay directly through the Overlay methods. 3233 */ 3234 ViewOverlay mOverlay; 3235 3236 /** 3237 * Consistency verifier for debugging purposes. 3238 * @hide 3239 */ 3240 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3241 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3242 new InputEventConsistencyVerifier(this, 0) : null; 3243 3244 private static final AtomicInteger sNextGeneratedId = new AtomicInteger(1); 3245 3246 /** 3247 * Simple constructor to use when creating a view from code. 3248 * 3249 * @param context The Context the view is running in, through which it can 3250 * access the current theme, resources, etc. 3251 */ 3252 public View(Context context) { 3253 mContext = context; 3254 mResources = context != null ? context.getResources() : null; 3255 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3256 // Set some flags defaults 3257 mPrivateFlags2 = 3258 (LAYOUT_DIRECTION_DEFAULT << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) | 3259 (TEXT_DIRECTION_DEFAULT << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) | 3260 (PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT) | 3261 (TEXT_ALIGNMENT_DEFAULT << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) | 3262 (PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT) | 3263 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3264 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3265 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3266 mUserPaddingStart = UNDEFINED_PADDING; 3267 mUserPaddingEnd = UNDEFINED_PADDING; 3268 3269 if (!sUseBrokenMakeMeasureSpec && context.getApplicationInfo().targetSdkVersion <= 3270 Build.VERSION_CODES.JELLY_BEAN_MR1 ) { 3271 // Older apps may need this compatibility hack for measurement. 3272 sUseBrokenMakeMeasureSpec = true; 3273 } 3274 } 3275 3276 /** 3277 * Constructor that is called when inflating a view from XML. This is called 3278 * when a view is being constructed from an XML file, supplying attributes 3279 * that were specified in the XML file. This version uses a default style of 3280 * 0, so the only attribute values applied are those in the Context's Theme 3281 * and the given AttributeSet. 3282 * 3283 * <p> 3284 * The method onFinishInflate() will be called after all children have been 3285 * added. 3286 * 3287 * @param context The Context the view is running in, through which it can 3288 * access the current theme, resources, etc. 3289 * @param attrs The attributes of the XML tag that is inflating the view. 3290 * @see #View(Context, AttributeSet, int) 3291 */ 3292 public View(Context context, AttributeSet attrs) { 3293 this(context, attrs, 0); 3294 } 3295 3296 /** 3297 * Perform inflation from XML and apply a class-specific base style. This 3298 * constructor of View allows subclasses to use their own base style when 3299 * they are inflating. For example, a Button class's constructor would call 3300 * this version of the super class constructor and supply 3301 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3302 * the theme's button style to modify all of the base view attributes (in 3303 * particular its background) as well as the Button class's attributes. 3304 * 3305 * @param context The Context the view is running in, through which it can 3306 * access the current theme, resources, etc. 3307 * @param attrs The attributes of the XML tag that is inflating the view. 3308 * @param defStyle The default style to apply to this view. If 0, no style 3309 * will be applied (beyond what is included in the theme). This may 3310 * either be an attribute resource, whose value will be retrieved 3311 * from the current theme, or an explicit style resource. 3312 * @see #View(Context, AttributeSet) 3313 */ 3314 public View(Context context, AttributeSet attrs, int defStyle) { 3315 this(context); 3316 3317 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3318 defStyle, 0); 3319 3320 Drawable background = null; 3321 3322 int leftPadding = -1; 3323 int topPadding = -1; 3324 int rightPadding = -1; 3325 int bottomPadding = -1; 3326 int startPadding = UNDEFINED_PADDING; 3327 int endPadding = UNDEFINED_PADDING; 3328 3329 int padding = -1; 3330 3331 int viewFlagValues = 0; 3332 int viewFlagMasks = 0; 3333 3334 boolean setScrollContainer = false; 3335 3336 int x = 0; 3337 int y = 0; 3338 3339 float tx = 0; 3340 float ty = 0; 3341 float rotation = 0; 3342 float rotationX = 0; 3343 float rotationY = 0; 3344 float sx = 1f; 3345 float sy = 1f; 3346 boolean transformSet = false; 3347 3348 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3349 int overScrollMode = mOverScrollMode; 3350 boolean initializeScrollbars = false; 3351 3352 boolean leftPaddingDefined = false; 3353 boolean rightPaddingDefined = false; 3354 boolean startPaddingDefined = false; 3355 boolean endPaddingDefined = false; 3356 3357 final int targetSdkVersion = context.getApplicationInfo().targetSdkVersion; 3358 3359 final int N = a.getIndexCount(); 3360 for (int i = 0; i < N; i++) { 3361 int attr = a.getIndex(i); 3362 switch (attr) { 3363 case com.android.internal.R.styleable.View_background: 3364 background = a.getDrawable(attr); 3365 break; 3366 case com.android.internal.R.styleable.View_padding: 3367 padding = a.getDimensionPixelSize(attr, -1); 3368 mUserPaddingLeftInitial = padding; 3369 mUserPaddingRightInitial = padding; 3370 leftPaddingDefined = true; 3371 rightPaddingDefined = true; 3372 break; 3373 case com.android.internal.R.styleable.View_paddingLeft: 3374 leftPadding = a.getDimensionPixelSize(attr, -1); 3375 mUserPaddingLeftInitial = leftPadding; 3376 leftPaddingDefined = true; 3377 break; 3378 case com.android.internal.R.styleable.View_paddingTop: 3379 topPadding = a.getDimensionPixelSize(attr, -1); 3380 break; 3381 case com.android.internal.R.styleable.View_paddingRight: 3382 rightPadding = a.getDimensionPixelSize(attr, -1); 3383 mUserPaddingRightInitial = rightPadding; 3384 rightPaddingDefined = true; 3385 break; 3386 case com.android.internal.R.styleable.View_paddingBottom: 3387 bottomPadding = a.getDimensionPixelSize(attr, -1); 3388 break; 3389 case com.android.internal.R.styleable.View_paddingStart: 3390 startPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3391 startPaddingDefined = true; 3392 break; 3393 case com.android.internal.R.styleable.View_paddingEnd: 3394 endPadding = a.getDimensionPixelSize(attr, UNDEFINED_PADDING); 3395 endPaddingDefined = true; 3396 break; 3397 case com.android.internal.R.styleable.View_scrollX: 3398 x = a.getDimensionPixelOffset(attr, 0); 3399 break; 3400 case com.android.internal.R.styleable.View_scrollY: 3401 y = a.getDimensionPixelOffset(attr, 0); 3402 break; 3403 case com.android.internal.R.styleable.View_alpha: 3404 setAlpha(a.getFloat(attr, 1f)); 3405 break; 3406 case com.android.internal.R.styleable.View_transformPivotX: 3407 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3408 break; 3409 case com.android.internal.R.styleable.View_transformPivotY: 3410 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3411 break; 3412 case com.android.internal.R.styleable.View_translationX: 3413 tx = a.getDimensionPixelOffset(attr, 0); 3414 transformSet = true; 3415 break; 3416 case com.android.internal.R.styleable.View_translationY: 3417 ty = a.getDimensionPixelOffset(attr, 0); 3418 transformSet = true; 3419 break; 3420 case com.android.internal.R.styleable.View_rotation: 3421 rotation = a.getFloat(attr, 0); 3422 transformSet = true; 3423 break; 3424 case com.android.internal.R.styleable.View_rotationX: 3425 rotationX = a.getFloat(attr, 0); 3426 transformSet = true; 3427 break; 3428 case com.android.internal.R.styleable.View_rotationY: 3429 rotationY = a.getFloat(attr, 0); 3430 transformSet = true; 3431 break; 3432 case com.android.internal.R.styleable.View_scaleX: 3433 sx = a.getFloat(attr, 1f); 3434 transformSet = true; 3435 break; 3436 case com.android.internal.R.styleable.View_scaleY: 3437 sy = a.getFloat(attr, 1f); 3438 transformSet = true; 3439 break; 3440 case com.android.internal.R.styleable.View_id: 3441 mID = a.getResourceId(attr, NO_ID); 3442 break; 3443 case com.android.internal.R.styleable.View_tag: 3444 mTag = a.getText(attr); 3445 break; 3446 case com.android.internal.R.styleable.View_fitsSystemWindows: 3447 if (a.getBoolean(attr, false)) { 3448 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3449 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3450 } 3451 break; 3452 case com.android.internal.R.styleable.View_focusable: 3453 if (a.getBoolean(attr, false)) { 3454 viewFlagValues |= FOCUSABLE; 3455 viewFlagMasks |= FOCUSABLE_MASK; 3456 } 3457 break; 3458 case com.android.internal.R.styleable.View_focusableInTouchMode: 3459 if (a.getBoolean(attr, false)) { 3460 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3461 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3462 } 3463 break; 3464 case com.android.internal.R.styleable.View_clickable: 3465 if (a.getBoolean(attr, false)) { 3466 viewFlagValues |= CLICKABLE; 3467 viewFlagMasks |= CLICKABLE; 3468 } 3469 break; 3470 case com.android.internal.R.styleable.View_longClickable: 3471 if (a.getBoolean(attr, false)) { 3472 viewFlagValues |= LONG_CLICKABLE; 3473 viewFlagMasks |= LONG_CLICKABLE; 3474 } 3475 break; 3476 case com.android.internal.R.styleable.View_saveEnabled: 3477 if (!a.getBoolean(attr, true)) { 3478 viewFlagValues |= SAVE_DISABLED; 3479 viewFlagMasks |= SAVE_DISABLED_MASK; 3480 } 3481 break; 3482 case com.android.internal.R.styleable.View_duplicateParentState: 3483 if (a.getBoolean(attr, false)) { 3484 viewFlagValues |= DUPLICATE_PARENT_STATE; 3485 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3486 } 3487 break; 3488 case com.android.internal.R.styleable.View_visibility: 3489 final int visibility = a.getInt(attr, 0); 3490 if (visibility != 0) { 3491 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3492 viewFlagMasks |= VISIBILITY_MASK; 3493 } 3494 break; 3495 case com.android.internal.R.styleable.View_layoutDirection: 3496 // Clear any layout direction flags (included resolved bits) already set 3497 mPrivateFlags2 &= 3498 ~(PFLAG2_LAYOUT_DIRECTION_MASK | PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK); 3499 // Set the layout direction flags depending on the value of the attribute 3500 final int layoutDirection = a.getInt(attr, -1); 3501 final int value = (layoutDirection != -1) ? 3502 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3503 mPrivateFlags2 |= (value << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT); 3504 break; 3505 case com.android.internal.R.styleable.View_drawingCacheQuality: 3506 final int cacheQuality = a.getInt(attr, 0); 3507 if (cacheQuality != 0) { 3508 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3509 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3510 } 3511 break; 3512 case com.android.internal.R.styleable.View_contentDescription: 3513 setContentDescription(a.getString(attr)); 3514 break; 3515 case com.android.internal.R.styleable.View_labelFor: 3516 setLabelFor(a.getResourceId(attr, NO_ID)); 3517 break; 3518 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3519 if (!a.getBoolean(attr, true)) { 3520 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3521 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3522 } 3523 break; 3524 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3525 if (!a.getBoolean(attr, true)) { 3526 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3527 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3528 } 3529 break; 3530 case R.styleable.View_scrollbars: 3531 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3532 if (scrollbars != SCROLLBARS_NONE) { 3533 viewFlagValues |= scrollbars; 3534 viewFlagMasks |= SCROLLBARS_MASK; 3535 initializeScrollbars = true; 3536 } 3537 break; 3538 //noinspection deprecation 3539 case R.styleable.View_fadingEdge: 3540 if (targetSdkVersion >= ICE_CREAM_SANDWICH) { 3541 // Ignore the attribute starting with ICS 3542 break; 3543 } 3544 // With builds < ICS, fall through and apply fading edges 3545 case R.styleable.View_requiresFadingEdge: 3546 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3547 if (fadingEdge != FADING_EDGE_NONE) { 3548 viewFlagValues |= fadingEdge; 3549 viewFlagMasks |= FADING_EDGE_MASK; 3550 initializeFadingEdge(a); 3551 } 3552 break; 3553 case R.styleable.View_scrollbarStyle: 3554 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3555 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3556 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3557 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3558 } 3559 break; 3560 case R.styleable.View_isScrollContainer: 3561 setScrollContainer = true; 3562 if (a.getBoolean(attr, false)) { 3563 setScrollContainer(true); 3564 } 3565 break; 3566 case com.android.internal.R.styleable.View_keepScreenOn: 3567 if (a.getBoolean(attr, false)) { 3568 viewFlagValues |= KEEP_SCREEN_ON; 3569 viewFlagMasks |= KEEP_SCREEN_ON; 3570 } 3571 break; 3572 case R.styleable.View_filterTouchesWhenObscured: 3573 if (a.getBoolean(attr, false)) { 3574 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3575 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3576 } 3577 break; 3578 case R.styleable.View_nextFocusLeft: 3579 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3580 break; 3581 case R.styleable.View_nextFocusRight: 3582 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3583 break; 3584 case R.styleable.View_nextFocusUp: 3585 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3586 break; 3587 case R.styleable.View_nextFocusDown: 3588 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3589 break; 3590 case R.styleable.View_nextFocusForward: 3591 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3592 break; 3593 case R.styleable.View_minWidth: 3594 mMinWidth = a.getDimensionPixelSize(attr, 0); 3595 break; 3596 case R.styleable.View_minHeight: 3597 mMinHeight = a.getDimensionPixelSize(attr, 0); 3598 break; 3599 case R.styleable.View_onClick: 3600 if (context.isRestricted()) { 3601 throw new IllegalStateException("The android:onClick attribute cannot " 3602 + "be used within a restricted context"); 3603 } 3604 3605 final String handlerName = a.getString(attr); 3606 if (handlerName != null) { 3607 setOnClickListener(new OnClickListener() { 3608 private Method mHandler; 3609 3610 public void onClick(View v) { 3611 if (mHandler == null) { 3612 try { 3613 mHandler = getContext().getClass().getMethod(handlerName, 3614 View.class); 3615 } catch (NoSuchMethodException e) { 3616 int id = getId(); 3617 String idText = id == NO_ID ? "" : " with id '" 3618 + getContext().getResources().getResourceEntryName( 3619 id) + "'"; 3620 throw new IllegalStateException("Could not find a method " + 3621 handlerName + "(View) in the activity " 3622 + getContext().getClass() + " for onClick handler" 3623 + " on view " + View.this.getClass() + idText, e); 3624 } 3625 } 3626 3627 try { 3628 mHandler.invoke(getContext(), View.this); 3629 } catch (IllegalAccessException e) { 3630 throw new IllegalStateException("Could not execute non " 3631 + "public method of the activity", e); 3632 } catch (InvocationTargetException e) { 3633 throw new IllegalStateException("Could not execute " 3634 + "method of the activity", e); 3635 } 3636 } 3637 }); 3638 } 3639 break; 3640 case R.styleable.View_overScrollMode: 3641 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3642 break; 3643 case R.styleable.View_verticalScrollbarPosition: 3644 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3645 break; 3646 case R.styleable.View_layerType: 3647 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3648 break; 3649 case R.styleable.View_textDirection: 3650 // Clear any text direction flag already set 3651 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 3652 // Set the text direction flags depending on the value of the attribute 3653 final int textDirection = a.getInt(attr, -1); 3654 if (textDirection != -1) { 3655 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_FLAGS[textDirection]; 3656 } 3657 break; 3658 case R.styleable.View_textAlignment: 3659 // Clear any text alignment flag already set 3660 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 3661 // Set the text alignment flag depending on the value of the attribute 3662 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3663 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_FLAGS[textAlignment]; 3664 break; 3665 case R.styleable.View_importantForAccessibility: 3666 setImportantForAccessibility(a.getInt(attr, 3667 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3668 break; 3669 } 3670 } 3671 3672 setOverScrollMode(overScrollMode); 3673 3674 // Cache start/end user padding as we cannot fully resolve padding here (we dont have yet 3675 // the resolved layout direction). Those cached values will be used later during padding 3676 // resolution. 3677 mUserPaddingStart = startPadding; 3678 mUserPaddingEnd = endPadding; 3679 3680 if (background != null) { 3681 setBackground(background); 3682 } 3683 3684 if (padding >= 0) { 3685 leftPadding = padding; 3686 topPadding = padding; 3687 rightPadding = padding; 3688 bottomPadding = padding; 3689 mUserPaddingLeftInitial = padding; 3690 mUserPaddingRightInitial = padding; 3691 } 3692 3693 if (isRtlCompatibilityMode()) { 3694 // RTL compatibility mode: pre Jelly Bean MR1 case OR no RTL support case. 3695 // left / right padding are used if defined (meaning here nothing to do). If they are not 3696 // defined and start / end padding are defined (e.g. in Frameworks resources), then we use 3697 // start / end and resolve them as left / right (layout direction is not taken into account). 3698 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3699 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3700 // defined. 3701 if (!leftPaddingDefined && startPaddingDefined) { 3702 leftPadding = startPadding; 3703 } 3704 mUserPaddingLeftInitial = (leftPadding >= 0) ? leftPadding : mUserPaddingLeftInitial; 3705 if (!rightPaddingDefined && endPaddingDefined) { 3706 rightPadding = endPadding; 3707 } 3708 mUserPaddingRightInitial = (rightPadding >= 0) ? rightPadding : mUserPaddingRightInitial; 3709 } else { 3710 // Jelly Bean MR1 and after case: if start/end defined, they will override any left/right 3711 // values defined. Otherwise, left /right values are used. 3712 // Padding from the background drawable is stored at this point in mUserPaddingLeftInitial 3713 // and mUserPaddingRightInitial) so drawable padding will be used as ultimate default if 3714 // defined. 3715 if (leftPaddingDefined) { 3716 mUserPaddingLeftInitial = leftPadding; 3717 } 3718 if (rightPaddingDefined) { 3719 mUserPaddingRightInitial = rightPadding; 3720 } 3721 } 3722 3723 internalSetPadding( 3724 mUserPaddingLeftInitial, 3725 topPadding >= 0 ? topPadding : mPaddingTop, 3726 mUserPaddingRightInitial, 3727 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3728 3729 if (viewFlagMasks != 0) { 3730 setFlags(viewFlagValues, viewFlagMasks); 3731 } 3732 3733 if (initializeScrollbars) { 3734 initializeScrollbars(a); 3735 } 3736 3737 a.recycle(); 3738 3739 // Needs to be called after mViewFlags is set 3740 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3741 recomputePadding(); 3742 } 3743 3744 if (x != 0 || y != 0) { 3745 scrollTo(x, y); 3746 } 3747 3748 if (transformSet) { 3749 setTranslationX(tx); 3750 setTranslationY(ty); 3751 setRotation(rotation); 3752 setRotationX(rotationX); 3753 setRotationY(rotationY); 3754 setScaleX(sx); 3755 setScaleY(sy); 3756 } 3757 3758 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3759 setScrollContainer(true); 3760 } 3761 3762 computeOpaqueFlags(); 3763 } 3764 3765 /** 3766 * Non-public constructor for use in testing 3767 */ 3768 View() { 3769 mResources = null; 3770 } 3771 3772 public String toString() { 3773 StringBuilder out = new StringBuilder(128); 3774 out.append(getClass().getName()); 3775 out.append('{'); 3776 out.append(Integer.toHexString(System.identityHashCode(this))); 3777 out.append(' '); 3778 switch (mViewFlags&VISIBILITY_MASK) { 3779 case VISIBLE: out.append('V'); break; 3780 case INVISIBLE: out.append('I'); break; 3781 case GONE: out.append('G'); break; 3782 default: out.append('.'); break; 3783 } 3784 out.append((mViewFlags&FOCUSABLE_MASK) == FOCUSABLE ? 'F' : '.'); 3785 out.append((mViewFlags&ENABLED_MASK) == ENABLED ? 'E' : '.'); 3786 out.append((mViewFlags&DRAW_MASK) == WILL_NOT_DRAW ? '.' : 'D'); 3787 out.append((mViewFlags&SCROLLBARS_HORIZONTAL) != 0 ? 'H' : '.'); 3788 out.append((mViewFlags&SCROLLBARS_VERTICAL) != 0 ? 'V' : '.'); 3789 out.append((mViewFlags&CLICKABLE) != 0 ? 'C' : '.'); 3790 out.append((mViewFlags&LONG_CLICKABLE) != 0 ? 'L' : '.'); 3791 out.append(' '); 3792 out.append((mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0 ? 'R' : '.'); 3793 out.append((mPrivateFlags&PFLAG_FOCUSED) != 0 ? 'F' : '.'); 3794 out.append((mPrivateFlags&PFLAG_SELECTED) != 0 ? 'S' : '.'); 3795 if ((mPrivateFlags&PFLAG_PREPRESSED) != 0) { 3796 out.append('p'); 3797 } else { 3798 out.append((mPrivateFlags&PFLAG_PRESSED) != 0 ? 'P' : '.'); 3799 } 3800 out.append((mPrivateFlags&PFLAG_HOVERED) != 0 ? 'H' : '.'); 3801 out.append((mPrivateFlags&PFLAG_ACTIVATED) != 0 ? 'A' : '.'); 3802 out.append((mPrivateFlags&PFLAG_INVALIDATED) != 0 ? 'I' : '.'); 3803 out.append((mPrivateFlags&PFLAG_DIRTY_MASK) != 0 ? 'D' : '.'); 3804 out.append(' '); 3805 out.append(mLeft); 3806 out.append(','); 3807 out.append(mTop); 3808 out.append('-'); 3809 out.append(mRight); 3810 out.append(','); 3811 out.append(mBottom); 3812 final int id = getId(); 3813 if (id != NO_ID) { 3814 out.append(" #"); 3815 out.append(Integer.toHexString(id)); 3816 final Resources r = mResources; 3817 if (id != 0 && r != null) { 3818 try { 3819 String pkgname; 3820 switch (id&0xff000000) { 3821 case 0x7f000000: 3822 pkgname="app"; 3823 break; 3824 case 0x01000000: 3825 pkgname="android"; 3826 break; 3827 default: 3828 pkgname = r.getResourcePackageName(id); 3829 break; 3830 } 3831 String typename = r.getResourceTypeName(id); 3832 String entryname = r.getResourceEntryName(id); 3833 out.append(" "); 3834 out.append(pkgname); 3835 out.append(":"); 3836 out.append(typename); 3837 out.append("/"); 3838 out.append(entryname); 3839 } catch (Resources.NotFoundException e) { 3840 } 3841 } 3842 } 3843 out.append("}"); 3844 return out.toString(); 3845 } 3846 3847 /** 3848 * <p> 3849 * Initializes the fading edges from a given set of styled attributes. This 3850 * method should be called by subclasses that need fading edges and when an 3851 * instance of these subclasses is created programmatically rather than 3852 * being inflated from XML. This method is automatically called when the XML 3853 * is inflated. 3854 * </p> 3855 * 3856 * @param a the styled attributes set to initialize the fading edges from 3857 */ 3858 protected void initializeFadingEdge(TypedArray a) { 3859 initScrollCache(); 3860 3861 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3862 R.styleable.View_fadingEdgeLength, 3863 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3864 } 3865 3866 /** 3867 * Returns the size of the vertical faded edges used to indicate that more 3868 * content in this view is visible. 3869 * 3870 * @return The size in pixels of the vertical faded edge or 0 if vertical 3871 * faded edges are not enabled for this view. 3872 * @attr ref android.R.styleable#View_fadingEdgeLength 3873 */ 3874 public int getVerticalFadingEdgeLength() { 3875 if (isVerticalFadingEdgeEnabled()) { 3876 ScrollabilityCache cache = mScrollCache; 3877 if (cache != null) { 3878 return cache.fadingEdgeLength; 3879 } 3880 } 3881 return 0; 3882 } 3883 3884 /** 3885 * Set the size of the faded edge used to indicate that more content in this 3886 * view is available. Will not change whether the fading edge is enabled; use 3887 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3888 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3889 * for the vertical or horizontal fading edges. 3890 * 3891 * @param length The size in pixels of the faded edge used to indicate that more 3892 * content in this view is visible. 3893 */ 3894 public void setFadingEdgeLength(int length) { 3895 initScrollCache(); 3896 mScrollCache.fadingEdgeLength = length; 3897 } 3898 3899 /** 3900 * Returns the size of the horizontal faded edges used to indicate that more 3901 * content in this view is visible. 3902 * 3903 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3904 * faded edges are not enabled for this view. 3905 * @attr ref android.R.styleable#View_fadingEdgeLength 3906 */ 3907 public int getHorizontalFadingEdgeLength() { 3908 if (isHorizontalFadingEdgeEnabled()) { 3909 ScrollabilityCache cache = mScrollCache; 3910 if (cache != null) { 3911 return cache.fadingEdgeLength; 3912 } 3913 } 3914 return 0; 3915 } 3916 3917 /** 3918 * Returns the width of the vertical scrollbar. 3919 * 3920 * @return The width in pixels of the vertical scrollbar or 0 if there 3921 * is no vertical scrollbar. 3922 */ 3923 public int getVerticalScrollbarWidth() { 3924 ScrollabilityCache cache = mScrollCache; 3925 if (cache != null) { 3926 ScrollBarDrawable scrollBar = cache.scrollBar; 3927 if (scrollBar != null) { 3928 int size = scrollBar.getSize(true); 3929 if (size <= 0) { 3930 size = cache.scrollBarSize; 3931 } 3932 return size; 3933 } 3934 return 0; 3935 } 3936 return 0; 3937 } 3938 3939 /** 3940 * Returns the height of the horizontal scrollbar. 3941 * 3942 * @return The height in pixels of the horizontal scrollbar or 0 if 3943 * there is no horizontal scrollbar. 3944 */ 3945 protected int getHorizontalScrollbarHeight() { 3946 ScrollabilityCache cache = mScrollCache; 3947 if (cache != null) { 3948 ScrollBarDrawable scrollBar = cache.scrollBar; 3949 if (scrollBar != null) { 3950 int size = scrollBar.getSize(false); 3951 if (size <= 0) { 3952 size = cache.scrollBarSize; 3953 } 3954 return size; 3955 } 3956 return 0; 3957 } 3958 return 0; 3959 } 3960 3961 /** 3962 * <p> 3963 * Initializes the scrollbars from a given set of styled attributes. This 3964 * method should be called by subclasses that need scrollbars and when an 3965 * instance of these subclasses is created programmatically rather than 3966 * being inflated from XML. This method is automatically called when the XML 3967 * is inflated. 3968 * </p> 3969 * 3970 * @param a the styled attributes set to initialize the scrollbars from 3971 */ 3972 protected void initializeScrollbars(TypedArray a) { 3973 initScrollCache(); 3974 3975 final ScrollabilityCache scrollabilityCache = mScrollCache; 3976 3977 if (scrollabilityCache.scrollBar == null) { 3978 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3979 } 3980 3981 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3982 3983 if (!fadeScrollbars) { 3984 scrollabilityCache.state = ScrollabilityCache.ON; 3985 } 3986 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3987 3988 3989 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3990 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3991 .getScrollBarFadeDuration()); 3992 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3993 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3994 ViewConfiguration.getScrollDefaultDelay()); 3995 3996 3997 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3998 com.android.internal.R.styleable.View_scrollbarSize, 3999 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 4000 4001 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 4002 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 4003 4004 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 4005 if (thumb != null) { 4006 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 4007 } 4008 4009 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 4010 false); 4011 if (alwaysDraw) { 4012 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 4013 } 4014 4015 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 4016 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 4017 4018 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 4019 if (thumb != null) { 4020 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 4021 } 4022 4023 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 4024 false); 4025 if (alwaysDraw) { 4026 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 4027 } 4028 4029 // Apply layout direction to the new Drawables if needed 4030 final int layoutDirection = getLayoutDirection(); 4031 if (track != null) { 4032 track.setLayoutDirection(layoutDirection); 4033 } 4034 if (thumb != null) { 4035 thumb.setLayoutDirection(layoutDirection); 4036 } 4037 4038 // Re-apply user/background padding so that scrollbar(s) get added 4039 resolvePadding(); 4040 } 4041 4042 /** 4043 * <p> 4044 * Initalizes the scrollability cache if necessary. 4045 * </p> 4046 */ 4047 private void initScrollCache() { 4048 if (mScrollCache == null) { 4049 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 4050 } 4051 } 4052 4053 private ScrollabilityCache getScrollCache() { 4054 initScrollCache(); 4055 return mScrollCache; 4056 } 4057 4058 /** 4059 * Set the position of the vertical scroll bar. Should be one of 4060 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 4061 * {@link #SCROLLBAR_POSITION_RIGHT}. 4062 * 4063 * @param position Where the vertical scroll bar should be positioned. 4064 */ 4065 public void setVerticalScrollbarPosition(int position) { 4066 if (mVerticalScrollbarPosition != position) { 4067 mVerticalScrollbarPosition = position; 4068 computeOpaqueFlags(); 4069 resolvePadding(); 4070 } 4071 } 4072 4073 /** 4074 * @return The position where the vertical scroll bar will show, if applicable. 4075 * @see #setVerticalScrollbarPosition(int) 4076 */ 4077 public int getVerticalScrollbarPosition() { 4078 return mVerticalScrollbarPosition; 4079 } 4080 4081 ListenerInfo getListenerInfo() { 4082 if (mListenerInfo != null) { 4083 return mListenerInfo; 4084 } 4085 mListenerInfo = new ListenerInfo(); 4086 return mListenerInfo; 4087 } 4088 4089 /** 4090 * Register a callback to be invoked when focus of this view changed. 4091 * 4092 * @param l The callback that will run. 4093 */ 4094 public void setOnFocusChangeListener(OnFocusChangeListener l) { 4095 getListenerInfo().mOnFocusChangeListener = l; 4096 } 4097 4098 /** 4099 * Add a listener that will be called when the bounds of the view change due to 4100 * layout processing. 4101 * 4102 * @param listener The listener that will be called when layout bounds change. 4103 */ 4104 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 4105 ListenerInfo li = getListenerInfo(); 4106 if (li.mOnLayoutChangeListeners == null) { 4107 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 4108 } 4109 if (!li.mOnLayoutChangeListeners.contains(listener)) { 4110 li.mOnLayoutChangeListeners.add(listener); 4111 } 4112 } 4113 4114 /** 4115 * Remove a listener for layout changes. 4116 * 4117 * @param listener The listener for layout bounds change. 4118 */ 4119 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 4120 ListenerInfo li = mListenerInfo; 4121 if (li == null || li.mOnLayoutChangeListeners == null) { 4122 return; 4123 } 4124 li.mOnLayoutChangeListeners.remove(listener); 4125 } 4126 4127 /** 4128 * Add a listener for attach state changes. 4129 * 4130 * This listener will be called whenever this view is attached or detached 4131 * from a window. Remove the listener using 4132 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 4133 * 4134 * @param listener Listener to attach 4135 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 4136 */ 4137 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4138 ListenerInfo li = getListenerInfo(); 4139 if (li.mOnAttachStateChangeListeners == null) { 4140 li.mOnAttachStateChangeListeners 4141 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 4142 } 4143 li.mOnAttachStateChangeListeners.add(listener); 4144 } 4145 4146 /** 4147 * Remove a listener for attach state changes. The listener will receive no further 4148 * notification of window attach/detach events. 4149 * 4150 * @param listener Listener to remove 4151 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 4152 */ 4153 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 4154 ListenerInfo li = mListenerInfo; 4155 if (li == null || li.mOnAttachStateChangeListeners == null) { 4156 return; 4157 } 4158 li.mOnAttachStateChangeListeners.remove(listener); 4159 } 4160 4161 /** 4162 * Returns the focus-change callback registered for this view. 4163 * 4164 * @return The callback, or null if one is not registered. 4165 */ 4166 public OnFocusChangeListener getOnFocusChangeListener() { 4167 ListenerInfo li = mListenerInfo; 4168 return li != null ? li.mOnFocusChangeListener : null; 4169 } 4170 4171 /** 4172 * Register a callback to be invoked when this view is clicked. If this view is not 4173 * clickable, it becomes clickable. 4174 * 4175 * @param l The callback that will run 4176 * 4177 * @see #setClickable(boolean) 4178 */ 4179 public void setOnClickListener(OnClickListener l) { 4180 if (!isClickable()) { 4181 setClickable(true); 4182 } 4183 getListenerInfo().mOnClickListener = l; 4184 } 4185 4186 /** 4187 * Return whether this view has an attached OnClickListener. Returns 4188 * true if there is a listener, false if there is none. 4189 */ 4190 public boolean hasOnClickListeners() { 4191 ListenerInfo li = mListenerInfo; 4192 return (li != null && li.mOnClickListener != null); 4193 } 4194 4195 /** 4196 * Register a callback to be invoked when this view is clicked and held. If this view is not 4197 * long clickable, it becomes long clickable. 4198 * 4199 * @param l The callback that will run 4200 * 4201 * @see #setLongClickable(boolean) 4202 */ 4203 public void setOnLongClickListener(OnLongClickListener l) { 4204 if (!isLongClickable()) { 4205 setLongClickable(true); 4206 } 4207 getListenerInfo().mOnLongClickListener = l; 4208 } 4209 4210 /** 4211 * Register a callback to be invoked when the context menu for this view is 4212 * being built. If this view is not long clickable, it becomes long clickable. 4213 * 4214 * @param l The callback that will run 4215 * 4216 */ 4217 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 4218 if (!isLongClickable()) { 4219 setLongClickable(true); 4220 } 4221 getListenerInfo().mOnCreateContextMenuListener = l; 4222 } 4223 4224 /** 4225 * Call this view's OnClickListener, if it is defined. Performs all normal 4226 * actions associated with clicking: reporting accessibility event, playing 4227 * a sound, etc. 4228 * 4229 * @return True there was an assigned OnClickListener that was called, false 4230 * otherwise is returned. 4231 */ 4232 public boolean performClick() { 4233 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 4234 4235 ListenerInfo li = mListenerInfo; 4236 if (li != null && li.mOnClickListener != null) { 4237 playSoundEffect(SoundEffectConstants.CLICK); 4238 li.mOnClickListener.onClick(this); 4239 return true; 4240 } 4241 4242 return false; 4243 } 4244 4245 /** 4246 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 4247 * this only calls the listener, and does not do any associated clicking 4248 * actions like reporting an accessibility event. 4249 * 4250 * @return True there was an assigned OnClickListener that was called, false 4251 * otherwise is returned. 4252 */ 4253 public boolean callOnClick() { 4254 ListenerInfo li = mListenerInfo; 4255 if (li != null && li.mOnClickListener != null) { 4256 li.mOnClickListener.onClick(this); 4257 return true; 4258 } 4259 return false; 4260 } 4261 4262 /** 4263 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4264 * OnLongClickListener did not consume the event. 4265 * 4266 * @return True if one of the above receivers consumed the event, false otherwise. 4267 */ 4268 public boolean performLongClick() { 4269 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4270 4271 boolean handled = false; 4272 ListenerInfo li = mListenerInfo; 4273 if (li != null && li.mOnLongClickListener != null) { 4274 handled = li.mOnLongClickListener.onLongClick(View.this); 4275 } 4276 if (!handled) { 4277 handled = showContextMenu(); 4278 } 4279 if (handled) { 4280 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4281 } 4282 return handled; 4283 } 4284 4285 /** 4286 * Performs button-related actions during a touch down event. 4287 * 4288 * @param event The event. 4289 * @return True if the down was consumed. 4290 * 4291 * @hide 4292 */ 4293 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4294 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4295 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4296 return true; 4297 } 4298 } 4299 return false; 4300 } 4301 4302 /** 4303 * Bring up the context menu for this view. 4304 * 4305 * @return Whether a context menu was displayed. 4306 */ 4307 public boolean showContextMenu() { 4308 return getParent().showContextMenuForChild(this); 4309 } 4310 4311 /** 4312 * Bring up the context menu for this view, referring to the item under the specified point. 4313 * 4314 * @param x The referenced x coordinate. 4315 * @param y The referenced y coordinate. 4316 * @param metaState The keyboard modifiers that were pressed. 4317 * @return Whether a context menu was displayed. 4318 * 4319 * @hide 4320 */ 4321 public boolean showContextMenu(float x, float y, int metaState) { 4322 return showContextMenu(); 4323 } 4324 4325 /** 4326 * Start an action mode. 4327 * 4328 * @param callback Callback that will control the lifecycle of the action mode 4329 * @return The new action mode if it is started, null otherwise 4330 * 4331 * @see ActionMode 4332 */ 4333 public ActionMode startActionMode(ActionMode.Callback callback) { 4334 ViewParent parent = getParent(); 4335 if (parent == null) return null; 4336 return parent.startActionModeForChild(this, callback); 4337 } 4338 4339 /** 4340 * Register a callback to be invoked when a hardware key is pressed in this view. 4341 * Key presses in software input methods will generally not trigger the methods of 4342 * this listener. 4343 * @param l the key listener to attach to this view 4344 */ 4345 public void setOnKeyListener(OnKeyListener l) { 4346 getListenerInfo().mOnKeyListener = l; 4347 } 4348 4349 /** 4350 * Register a callback to be invoked when a touch event is sent to this view. 4351 * @param l the touch listener to attach to this view 4352 */ 4353 public void setOnTouchListener(OnTouchListener l) { 4354 getListenerInfo().mOnTouchListener = l; 4355 } 4356 4357 /** 4358 * Register a callback to be invoked when a generic motion event is sent to this view. 4359 * @param l the generic motion listener to attach to this view 4360 */ 4361 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4362 getListenerInfo().mOnGenericMotionListener = l; 4363 } 4364 4365 /** 4366 * Register a callback to be invoked when a hover event is sent to this view. 4367 * @param l the hover listener to attach to this view 4368 */ 4369 public void setOnHoverListener(OnHoverListener l) { 4370 getListenerInfo().mOnHoverListener = l; 4371 } 4372 4373 /** 4374 * Register a drag event listener callback object for this View. The parameter is 4375 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4376 * View, the system calls the 4377 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4378 * @param l An implementation of {@link android.view.View.OnDragListener}. 4379 */ 4380 public void setOnDragListener(OnDragListener l) { 4381 getListenerInfo().mOnDragListener = l; 4382 } 4383 4384 /** 4385 * Give this view focus. This will cause 4386 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4387 * 4388 * Note: this does not check whether this {@link View} should get focus, it just 4389 * gives it focus no matter what. It should only be called internally by framework 4390 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4391 * 4392 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4393 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4394 * focus moved when requestFocus() is called. It may not always 4395 * apply, in which case use the default View.FOCUS_DOWN. 4396 * @param previouslyFocusedRect The rectangle of the view that had focus 4397 * prior in this View's coordinate system. 4398 */ 4399 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4400 if (DBG) { 4401 System.out.println(this + " requestFocus()"); 4402 } 4403 4404 if ((mPrivateFlags & PFLAG_FOCUSED) == 0) { 4405 mPrivateFlags |= PFLAG_FOCUSED; 4406 4407 View oldFocus = (mAttachInfo != null) ? getRootView().findFocus() : null; 4408 4409 if (mParent != null) { 4410 mParent.requestChildFocus(this, this); 4411 } 4412 4413 if (mAttachInfo != null) { 4414 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, this); 4415 } 4416 4417 onFocusChanged(true, direction, previouslyFocusedRect); 4418 refreshDrawableState(); 4419 4420 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4421 notifyAccessibilityStateChanged(); 4422 } 4423 } 4424 } 4425 4426 /** 4427 * Request that a rectangle of this view be visible on the screen, 4428 * scrolling if necessary just enough. 4429 * 4430 * <p>A View should call this if it maintains some notion of which part 4431 * of its content is interesting. For example, a text editing view 4432 * should call this when its cursor moves. 4433 * 4434 * @param rectangle The rectangle. 4435 * @return Whether any parent scrolled. 4436 */ 4437 public boolean requestRectangleOnScreen(Rect rectangle) { 4438 return requestRectangleOnScreen(rectangle, false); 4439 } 4440 4441 /** 4442 * Request that a rectangle of this view be visible on the screen, 4443 * scrolling if necessary just enough. 4444 * 4445 * <p>A View should call this if it maintains some notion of which part 4446 * of its content is interesting. For example, a text editing view 4447 * should call this when its cursor moves. 4448 * 4449 * <p>When <code>immediate</code> is set to true, scrolling will not be 4450 * animated. 4451 * 4452 * @param rectangle The rectangle. 4453 * @param immediate True to forbid animated scrolling, false otherwise 4454 * @return Whether any parent scrolled. 4455 */ 4456 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4457 if (mParent == null) { 4458 return false; 4459 } 4460 4461 View child = this; 4462 4463 RectF position = (mAttachInfo != null) ? mAttachInfo.mTmpTransformRect : new RectF(); 4464 position.set(rectangle); 4465 4466 ViewParent parent = mParent; 4467 boolean scrolled = false; 4468 while (parent != null) { 4469 rectangle.set((int) position.left, (int) position.top, 4470 (int) position.right, (int) position.bottom); 4471 4472 scrolled |= parent.requestChildRectangleOnScreen(child, 4473 rectangle, immediate); 4474 4475 if (!child.hasIdentityMatrix()) { 4476 child.getMatrix().mapRect(position); 4477 } 4478 4479 position.offset(child.mLeft, child.mTop); 4480 4481 if (!(parent instanceof View)) { 4482 break; 4483 } 4484 4485 View parentView = (View) parent; 4486 4487 position.offset(-parentView.getScrollX(), -parentView.getScrollY()); 4488 4489 child = parentView; 4490 parent = child.getParent(); 4491 } 4492 4493 return scrolled; 4494 } 4495 4496 /** 4497 * Called when this view wants to give up focus. If focus is cleared 4498 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4499 * <p> 4500 * <strong>Note:</strong> When a View clears focus the framework is trying 4501 * to give focus to the first focusable View from the top. Hence, if this 4502 * View is the first from the top that can take focus, then all callbacks 4503 * related to clearing focus will be invoked after wich the framework will 4504 * give focus to this view. 4505 * </p> 4506 */ 4507 public void clearFocus() { 4508 if (DBG) { 4509 System.out.println(this + " clearFocus()"); 4510 } 4511 4512 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4513 mPrivateFlags &= ~PFLAG_FOCUSED; 4514 4515 if (mParent != null) { 4516 mParent.clearChildFocus(this); 4517 } 4518 4519 onFocusChanged(false, 0, null); 4520 4521 refreshDrawableState(); 4522 4523 if (!rootViewRequestFocus()) { 4524 notifyGlobalFocusCleared(this); 4525 } 4526 4527 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4528 notifyAccessibilityStateChanged(); 4529 } 4530 } 4531 } 4532 4533 void notifyGlobalFocusCleared(View oldFocus) { 4534 if (oldFocus != null && mAttachInfo != null) { 4535 mAttachInfo.mTreeObserver.dispatchOnGlobalFocusChange(oldFocus, null); 4536 } 4537 } 4538 4539 boolean rootViewRequestFocus() { 4540 View root = getRootView(); 4541 if (root != null) { 4542 return root.requestFocus(); 4543 } 4544 return false; 4545 } 4546 4547 /** 4548 * Called internally by the view system when a new view is getting focus. 4549 * This is what clears the old focus. 4550 */ 4551 void unFocus() { 4552 if (DBG) { 4553 System.out.println(this + " unFocus()"); 4554 } 4555 4556 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 4557 mPrivateFlags &= ~PFLAG_FOCUSED; 4558 4559 onFocusChanged(false, 0, null); 4560 refreshDrawableState(); 4561 4562 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4563 notifyAccessibilityStateChanged(); 4564 } 4565 } 4566 } 4567 4568 /** 4569 * Returns true if this view has focus iteself, or is the ancestor of the 4570 * view that has focus. 4571 * 4572 * @return True if this view has or contains focus, false otherwise. 4573 */ 4574 @ViewDebug.ExportedProperty(category = "focus") 4575 public boolean hasFocus() { 4576 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 4577 } 4578 4579 /** 4580 * Returns true if this view is focusable or if it contains a reachable View 4581 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4582 * is a View whose parents do not block descendants focus. 4583 * 4584 * Only {@link #VISIBLE} views are considered focusable. 4585 * 4586 * @return True if the view is focusable or if the view contains a focusable 4587 * View, false otherwise. 4588 * 4589 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4590 */ 4591 public boolean hasFocusable() { 4592 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4593 } 4594 4595 /** 4596 * Called by the view system when the focus state of this view changes. 4597 * When the focus change event is caused by directional navigation, direction 4598 * and previouslyFocusedRect provide insight into where the focus is coming from. 4599 * When overriding, be sure to call up through to the super class so that 4600 * the standard focus handling will occur. 4601 * 4602 * @param gainFocus True if the View has focus; false otherwise. 4603 * @param direction The direction focus has moved when requestFocus() 4604 * is called to give this view focus. Values are 4605 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4606 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4607 * It may not always apply, in which case use the default. 4608 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4609 * system, of the previously focused view. If applicable, this will be 4610 * passed in as finer grained information about where the focus is coming 4611 * from (in addition to direction). Will be <code>null</code> otherwise. 4612 */ 4613 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4614 if (gainFocus) { 4615 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4616 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4617 } 4618 } 4619 4620 InputMethodManager imm = InputMethodManager.peekInstance(); 4621 if (!gainFocus) { 4622 if (isPressed()) { 4623 setPressed(false); 4624 } 4625 if (imm != null && mAttachInfo != null 4626 && mAttachInfo.mHasWindowFocus) { 4627 imm.focusOut(this); 4628 } 4629 onFocusLost(); 4630 } else if (imm != null && mAttachInfo != null 4631 && mAttachInfo.mHasWindowFocus) { 4632 imm.focusIn(this); 4633 } 4634 4635 invalidate(true); 4636 ListenerInfo li = mListenerInfo; 4637 if (li != null && li.mOnFocusChangeListener != null) { 4638 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4639 } 4640 4641 if (mAttachInfo != null) { 4642 mAttachInfo.mKeyDispatchState.reset(this); 4643 } 4644 } 4645 4646 /** 4647 * Sends an accessibility event of the given type. If accessibility is 4648 * not enabled this method has no effect. The default implementation calls 4649 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4650 * to populate information about the event source (this View), then calls 4651 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4652 * populate the text content of the event source including its descendants, 4653 * and last calls 4654 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4655 * on its parent to resuest sending of the event to interested parties. 4656 * <p> 4657 * If an {@link AccessibilityDelegate} has been specified via calling 4658 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4659 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4660 * responsible for handling this call. 4661 * </p> 4662 * 4663 * @param eventType The type of the event to send, as defined by several types from 4664 * {@link android.view.accessibility.AccessibilityEvent}, such as 4665 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4666 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4667 * 4668 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4669 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4670 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4671 * @see AccessibilityDelegate 4672 */ 4673 public void sendAccessibilityEvent(int eventType) { 4674 if (mAccessibilityDelegate != null) { 4675 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4676 } else { 4677 sendAccessibilityEventInternal(eventType); 4678 } 4679 } 4680 4681 /** 4682 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4683 * {@link AccessibilityEvent} to make an announcement which is related to some 4684 * sort of a context change for which none of the events representing UI transitions 4685 * is a good fit. For example, announcing a new page in a book. If accessibility 4686 * is not enabled this method does nothing. 4687 * 4688 * @param text The announcement text. 4689 */ 4690 public void announceForAccessibility(CharSequence text) { 4691 if (AccessibilityManager.getInstance(mContext).isEnabled() && mParent != null) { 4692 AccessibilityEvent event = AccessibilityEvent.obtain( 4693 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4694 onInitializeAccessibilityEvent(event); 4695 event.getText().add(text); 4696 event.setContentDescription(null); 4697 mParent.requestSendAccessibilityEvent(this, event); 4698 } 4699 } 4700 4701 /** 4702 * @see #sendAccessibilityEvent(int) 4703 * 4704 * Note: Called from the default {@link AccessibilityDelegate}. 4705 */ 4706 void sendAccessibilityEventInternal(int eventType) { 4707 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4708 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4709 } 4710 } 4711 4712 /** 4713 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4714 * takes as an argument an empty {@link AccessibilityEvent} and does not 4715 * perform a check whether accessibility is enabled. 4716 * <p> 4717 * If an {@link AccessibilityDelegate} has been specified via calling 4718 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4719 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4720 * is responsible for handling this call. 4721 * </p> 4722 * 4723 * @param event The event to send. 4724 * 4725 * @see #sendAccessibilityEvent(int) 4726 */ 4727 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4728 if (mAccessibilityDelegate != null) { 4729 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4730 } else { 4731 sendAccessibilityEventUncheckedInternal(event); 4732 } 4733 } 4734 4735 /** 4736 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4737 * 4738 * Note: Called from the default {@link AccessibilityDelegate}. 4739 */ 4740 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4741 if (!isShown()) { 4742 return; 4743 } 4744 onInitializeAccessibilityEvent(event); 4745 // Only a subset of accessibility events populates text content. 4746 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4747 dispatchPopulateAccessibilityEvent(event); 4748 } 4749 // In the beginning we called #isShown(), so we know that getParent() is not null. 4750 getParent().requestSendAccessibilityEvent(this, event); 4751 } 4752 4753 /** 4754 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4755 * to its children for adding their text content to the event. Note that the 4756 * event text is populated in a separate dispatch path since we add to the 4757 * event not only the text of the source but also the text of all its descendants. 4758 * A typical implementation will call 4759 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4760 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4761 * on each child. Override this method if custom population of the event text 4762 * content is required. 4763 * <p> 4764 * If an {@link AccessibilityDelegate} has been specified via calling 4765 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4766 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4767 * is responsible for handling this call. 4768 * </p> 4769 * <p> 4770 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4771 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4772 * </p> 4773 * 4774 * @param event The event. 4775 * 4776 * @return True if the event population was completed. 4777 */ 4778 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4779 if (mAccessibilityDelegate != null) { 4780 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4781 } else { 4782 return dispatchPopulateAccessibilityEventInternal(event); 4783 } 4784 } 4785 4786 /** 4787 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4788 * 4789 * Note: Called from the default {@link AccessibilityDelegate}. 4790 */ 4791 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4792 onPopulateAccessibilityEvent(event); 4793 return false; 4794 } 4795 4796 /** 4797 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4798 * giving a chance to this View to populate the accessibility event with its 4799 * text content. While this method is free to modify event 4800 * attributes other than text content, doing so should normally be performed in 4801 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4802 * <p> 4803 * Example: Adding formatted date string to an accessibility event in addition 4804 * to the text added by the super implementation: 4805 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4806 * super.onPopulateAccessibilityEvent(event); 4807 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4808 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4809 * mCurrentDate.getTimeInMillis(), flags); 4810 * event.getText().add(selectedDateUtterance); 4811 * }</pre> 4812 * <p> 4813 * If an {@link AccessibilityDelegate} has been specified via calling 4814 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4815 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4816 * is responsible for handling this call. 4817 * </p> 4818 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4819 * information to the event, in case the default implementation has basic information to add. 4820 * </p> 4821 * 4822 * @param event The accessibility event which to populate. 4823 * 4824 * @see #sendAccessibilityEvent(int) 4825 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4826 */ 4827 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4828 if (mAccessibilityDelegate != null) { 4829 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4830 } else { 4831 onPopulateAccessibilityEventInternal(event); 4832 } 4833 } 4834 4835 /** 4836 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4837 * 4838 * Note: Called from the default {@link AccessibilityDelegate}. 4839 */ 4840 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4841 4842 } 4843 4844 /** 4845 * Initializes an {@link AccessibilityEvent} with information about 4846 * this View which is the event source. In other words, the source of 4847 * an accessibility event is the view whose state change triggered firing 4848 * the event. 4849 * <p> 4850 * Example: Setting the password property of an event in addition 4851 * to properties set by the super implementation: 4852 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4853 * super.onInitializeAccessibilityEvent(event); 4854 * event.setPassword(true); 4855 * }</pre> 4856 * <p> 4857 * If an {@link AccessibilityDelegate} has been specified via calling 4858 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4859 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4860 * is responsible for handling this call. 4861 * </p> 4862 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4863 * information to the event, in case the default implementation has basic information to add. 4864 * </p> 4865 * @param event The event to initialize. 4866 * 4867 * @see #sendAccessibilityEvent(int) 4868 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4869 */ 4870 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4871 if (mAccessibilityDelegate != null) { 4872 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4873 } else { 4874 onInitializeAccessibilityEventInternal(event); 4875 } 4876 } 4877 4878 /** 4879 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4880 * 4881 * Note: Called from the default {@link AccessibilityDelegate}. 4882 */ 4883 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4884 event.setSource(this); 4885 event.setClassName(View.class.getName()); 4886 event.setPackageName(getContext().getPackageName()); 4887 event.setEnabled(isEnabled()); 4888 event.setContentDescription(mContentDescription); 4889 4890 switch (event.getEventType()) { 4891 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 4892 ArrayList<View> focusablesTempList = (mAttachInfo != null) 4893 ? mAttachInfo.mTempArrayList : new ArrayList<View>(); 4894 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 4895 event.setItemCount(focusablesTempList.size()); 4896 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4897 if (mAttachInfo != null) { 4898 focusablesTempList.clear(); 4899 } 4900 } break; 4901 case AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED: { 4902 CharSequence text = getIterableTextForAccessibility(); 4903 if (text != null && text.length() > 0) { 4904 event.setFromIndex(getAccessibilitySelectionStart()); 4905 event.setToIndex(getAccessibilitySelectionEnd()); 4906 event.setItemCount(text.length()); 4907 } 4908 } break; 4909 } 4910 } 4911 4912 /** 4913 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4914 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4915 * This method is responsible for obtaining an accessibility node info from a 4916 * pool of reusable instances and calling 4917 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4918 * initialize the former. 4919 * <p> 4920 * Note: The client is responsible for recycling the obtained instance by calling 4921 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4922 * </p> 4923 * 4924 * @return A populated {@link AccessibilityNodeInfo}. 4925 * 4926 * @see AccessibilityNodeInfo 4927 */ 4928 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4929 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4930 if (provider != null) { 4931 return provider.createAccessibilityNodeInfo(View.NO_ID); 4932 } else { 4933 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4934 onInitializeAccessibilityNodeInfo(info); 4935 return info; 4936 } 4937 } 4938 4939 /** 4940 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4941 * The base implementation sets: 4942 * <ul> 4943 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4944 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4945 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4946 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4947 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4948 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4949 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4950 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4951 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4952 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4953 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4954 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4955 * </ul> 4956 * <p> 4957 * Subclasses should override this method, call the super implementation, 4958 * and set additional attributes. 4959 * </p> 4960 * <p> 4961 * If an {@link AccessibilityDelegate} has been specified via calling 4962 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4963 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4964 * is responsible for handling this call. 4965 * </p> 4966 * 4967 * @param info The instance to initialize. 4968 */ 4969 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4970 if (mAccessibilityDelegate != null) { 4971 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4972 } else { 4973 onInitializeAccessibilityNodeInfoInternal(info); 4974 } 4975 } 4976 4977 /** 4978 * Gets the location of this view in screen coordintates. 4979 * 4980 * @param outRect The output location 4981 */ 4982 void getBoundsOnScreen(Rect outRect) { 4983 if (mAttachInfo == null) { 4984 return; 4985 } 4986 4987 RectF position = mAttachInfo.mTmpTransformRect; 4988 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4989 4990 if (!hasIdentityMatrix()) { 4991 getMatrix().mapRect(position); 4992 } 4993 4994 position.offset(mLeft, mTop); 4995 4996 ViewParent parent = mParent; 4997 while (parent instanceof View) { 4998 View parentView = (View) parent; 4999 5000 position.offset(-parentView.mScrollX, -parentView.mScrollY); 5001 5002 if (!parentView.hasIdentityMatrix()) { 5003 parentView.getMatrix().mapRect(position); 5004 } 5005 5006 position.offset(parentView.mLeft, parentView.mTop); 5007 5008 parent = parentView.mParent; 5009 } 5010 5011 if (parent instanceof ViewRootImpl) { 5012 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 5013 position.offset(0, -viewRootImpl.mCurScrollY); 5014 } 5015 5016 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 5017 5018 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 5019 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 5020 } 5021 5022 /** 5023 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 5024 * 5025 * Note: Called from the default {@link AccessibilityDelegate}. 5026 */ 5027 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 5028 Rect bounds = mAttachInfo.mTmpInvalRect; 5029 5030 getDrawingRect(bounds); 5031 info.setBoundsInParent(bounds); 5032 5033 getBoundsOnScreen(bounds); 5034 info.setBoundsInScreen(bounds); 5035 5036 ViewParent parent = getParentForAccessibility(); 5037 if (parent instanceof View) { 5038 info.setParent((View) parent); 5039 } 5040 5041 if (mID != View.NO_ID) { 5042 View rootView = getRootView(); 5043 if (rootView == null) { 5044 rootView = this; 5045 } 5046 View label = rootView.findLabelForView(this, mID); 5047 if (label != null) { 5048 info.setLabeledBy(label); 5049 } 5050 5051 if ((mAttachInfo.mAccessibilityFetchFlags 5052 & AccessibilityNodeInfo.FLAG_REPORT_VIEW_IDS) != 0 5053 && Resources.resourceHasPackage(mID)) { 5054 try { 5055 String viewId = getResources().getResourceName(mID); 5056 info.setViewIdResourceName(viewId); 5057 } catch (Resources.NotFoundException nfe) { 5058 /* ignore */ 5059 } 5060 } 5061 } 5062 5063 if (mLabelForId != View.NO_ID) { 5064 View rootView = getRootView(); 5065 if (rootView == null) { 5066 rootView = this; 5067 } 5068 View labeled = rootView.findViewInsideOutShouldExist(this, mLabelForId); 5069 if (labeled != null) { 5070 info.setLabelFor(labeled); 5071 } 5072 } 5073 5074 info.setVisibleToUser(isVisibleToUser()); 5075 5076 info.setPackageName(mContext.getPackageName()); 5077 info.setClassName(View.class.getName()); 5078 info.setContentDescription(getContentDescription()); 5079 5080 info.setEnabled(isEnabled()); 5081 info.setClickable(isClickable()); 5082 info.setFocusable(isFocusable()); 5083 info.setFocused(isFocused()); 5084 info.setAccessibilityFocused(isAccessibilityFocused()); 5085 info.setSelected(isSelected()); 5086 info.setLongClickable(isLongClickable()); 5087 5088 // TODO: These make sense only if we are in an AdapterView but all 5089 // views can be selected. Maybe from accessibility perspective 5090 // we should report as selectable view in an AdapterView. 5091 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 5092 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 5093 5094 if (isFocusable()) { 5095 if (isFocused()) { 5096 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 5097 } else { 5098 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 5099 } 5100 } 5101 5102 if (!isAccessibilityFocused()) { 5103 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 5104 } else { 5105 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 5106 } 5107 5108 if (isClickable() && isEnabled()) { 5109 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 5110 } 5111 5112 if (isLongClickable() && isEnabled()) { 5113 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 5114 } 5115 5116 CharSequence text = getIterableTextForAccessibility(); 5117 if (text != null && text.length() > 0) { 5118 info.setTextSelection(getAccessibilitySelectionStart(), getAccessibilitySelectionEnd()); 5119 5120 info.addAction(AccessibilityNodeInfo.ACTION_SET_SELECTION); 5121 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 5122 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 5123 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 5124 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 5125 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 5126 } 5127 } 5128 5129 private View findLabelForView(View view, int labeledId) { 5130 if (mMatchLabelForPredicate == null) { 5131 mMatchLabelForPredicate = new MatchLabelForPredicate(); 5132 } 5133 mMatchLabelForPredicate.mLabeledId = labeledId; 5134 return findViewByPredicateInsideOut(view, mMatchLabelForPredicate); 5135 } 5136 5137 /** 5138 * Computes whether this view is visible to the user. Such a view is 5139 * attached, visible, all its predecessors are visible, it is not clipped 5140 * entirely by its predecessors, and has an alpha greater than zero. 5141 * 5142 * @return Whether the view is visible on the screen. 5143 * 5144 * @hide 5145 */ 5146 protected boolean isVisibleToUser() { 5147 return isVisibleToUser(null); 5148 } 5149 5150 /** 5151 * Computes whether the given portion of this view is visible to the user. 5152 * Such a view is attached, visible, all its predecessors are visible, 5153 * has an alpha greater than zero, and the specified portion is not 5154 * clipped entirely by its predecessors. 5155 * 5156 * @param boundInView the portion of the view to test; coordinates should be relative; may be 5157 * <code>null</code>, and the entire view will be tested in this case. 5158 * When <code>true</code> is returned by the function, the actual visible 5159 * region will be stored in this parameter; that is, if boundInView is fully 5160 * contained within the view, no modification will be made, otherwise regions 5161 * outside of the visible area of the view will be clipped. 5162 * 5163 * @return Whether the specified portion of the view is visible on the screen. 5164 * 5165 * @hide 5166 */ 5167 protected boolean isVisibleToUser(Rect boundInView) { 5168 if (mAttachInfo != null) { 5169 // Attached to invisible window means this view is not visible. 5170 if (mAttachInfo.mWindowVisibility != View.VISIBLE) { 5171 return false; 5172 } 5173 // An invisible predecessor or one with alpha zero means 5174 // that this view is not visible to the user. 5175 Object current = this; 5176 while (current instanceof View) { 5177 View view = (View) current; 5178 // We have attach info so this view is attached and there is no 5179 // need to check whether we reach to ViewRootImpl on the way up. 5180 if (view.getAlpha() <= 0 || view.getVisibility() != VISIBLE) { 5181 return false; 5182 } 5183 current = view.mParent; 5184 } 5185 // Check if the view is entirely covered by its predecessors. 5186 Rect visibleRect = mAttachInfo.mTmpInvalRect; 5187 Point offset = mAttachInfo.mPoint; 5188 if (!getGlobalVisibleRect(visibleRect, offset)) { 5189 return false; 5190 } 5191 // Check if the visible portion intersects the rectangle of interest. 5192 if (boundInView != null) { 5193 visibleRect.offset(-offset.x, -offset.y); 5194 return boundInView.intersect(visibleRect); 5195 } 5196 return true; 5197 } 5198 return false; 5199 } 5200 5201 /** 5202 * Returns the delegate for implementing accessibility support via 5203 * composition. For more details see {@link AccessibilityDelegate}. 5204 * 5205 * @return The delegate, or null if none set. 5206 * 5207 * @hide 5208 */ 5209 public AccessibilityDelegate getAccessibilityDelegate() { 5210 return mAccessibilityDelegate; 5211 } 5212 5213 /** 5214 * Sets a delegate for implementing accessibility support via composition as 5215 * opposed to inheritance. The delegate's primary use is for implementing 5216 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 5217 * 5218 * @param delegate The delegate instance. 5219 * 5220 * @see AccessibilityDelegate 5221 */ 5222 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 5223 mAccessibilityDelegate = delegate; 5224 } 5225 5226 /** 5227 * Gets the provider for managing a virtual view hierarchy rooted at this View 5228 * and reported to {@link android.accessibilityservice.AccessibilityService}s 5229 * that explore the window content. 5230 * <p> 5231 * If this method returns an instance, this instance is responsible for managing 5232 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 5233 * View including the one representing the View itself. Similarly the returned 5234 * instance is responsible for performing accessibility actions on any virtual 5235 * view or the root view itself. 5236 * </p> 5237 * <p> 5238 * If an {@link AccessibilityDelegate} has been specified via calling 5239 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 5240 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 5241 * is responsible for handling this call. 5242 * </p> 5243 * 5244 * @return The provider. 5245 * 5246 * @see AccessibilityNodeProvider 5247 */ 5248 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 5249 if (mAccessibilityDelegate != null) { 5250 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 5251 } else { 5252 return null; 5253 } 5254 } 5255 5256 /** 5257 * Gets the unique identifier of this view on the screen for accessibility purposes. 5258 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 5259 * 5260 * @return The view accessibility id. 5261 * 5262 * @hide 5263 */ 5264 public int getAccessibilityViewId() { 5265 if (mAccessibilityViewId == NO_ID) { 5266 mAccessibilityViewId = sNextAccessibilityViewId++; 5267 } 5268 return mAccessibilityViewId; 5269 } 5270 5271 /** 5272 * Gets the unique identifier of the window in which this View reseides. 5273 * 5274 * @return The window accessibility id. 5275 * 5276 * @hide 5277 */ 5278 public int getAccessibilityWindowId() { 5279 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 5280 } 5281 5282 /** 5283 * Gets the {@link View} description. It briefly describes the view and is 5284 * primarily used for accessibility support. Set this property to enable 5285 * better accessibility support for your application. This is especially 5286 * true for views that do not have textual representation (For example, 5287 * ImageButton). 5288 * 5289 * @return The content description. 5290 * 5291 * @attr ref android.R.styleable#View_contentDescription 5292 */ 5293 @ViewDebug.ExportedProperty(category = "accessibility") 5294 public CharSequence getContentDescription() { 5295 return mContentDescription; 5296 } 5297 5298 /** 5299 * Sets the {@link View} description. It briefly describes the view and is 5300 * primarily used for accessibility support. Set this property to enable 5301 * better accessibility support for your application. This is especially 5302 * true for views that do not have textual representation (For example, 5303 * ImageButton). 5304 * 5305 * @param contentDescription The content description. 5306 * 5307 * @attr ref android.R.styleable#View_contentDescription 5308 */ 5309 @RemotableViewMethod 5310 public void setContentDescription(CharSequence contentDescription) { 5311 if (mContentDescription == null) { 5312 if (contentDescription == null) { 5313 return; 5314 } 5315 } else if (mContentDescription.equals(contentDescription)) { 5316 return; 5317 } 5318 mContentDescription = contentDescription; 5319 final boolean nonEmptyDesc = contentDescription != null && contentDescription.length() > 0; 5320 if (nonEmptyDesc && getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 5321 setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 5322 } 5323 notifyAccessibilityStateChanged(); 5324 } 5325 5326 /** 5327 * Gets the id of a view for which this view serves as a label for 5328 * accessibility purposes. 5329 * 5330 * @return The labeled view id. 5331 */ 5332 @ViewDebug.ExportedProperty(category = "accessibility") 5333 public int getLabelFor() { 5334 return mLabelForId; 5335 } 5336 5337 /** 5338 * Sets the id of a view for which this view serves as a label for 5339 * accessibility purposes. 5340 * 5341 * @param id The labeled view id. 5342 */ 5343 @RemotableViewMethod 5344 public void setLabelFor(int id) { 5345 mLabelForId = id; 5346 if (mLabelForId != View.NO_ID 5347 && mID == View.NO_ID) { 5348 mID = generateViewId(); 5349 } 5350 } 5351 5352 /** 5353 * Invoked whenever this view loses focus, either by losing window focus or by losing 5354 * focus within its window. This method can be used to clear any state tied to the 5355 * focus. For instance, if a button is held pressed with the trackball and the window 5356 * loses focus, this method can be used to cancel the press. 5357 * 5358 * Subclasses of View overriding this method should always call super.onFocusLost(). 5359 * 5360 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 5361 * @see #onWindowFocusChanged(boolean) 5362 * 5363 * @hide pending API council approval 5364 */ 5365 protected void onFocusLost() { 5366 resetPressedState(); 5367 } 5368 5369 private void resetPressedState() { 5370 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5371 return; 5372 } 5373 5374 if (isPressed()) { 5375 setPressed(false); 5376 5377 if (!mHasPerformedLongPress) { 5378 removeLongPressCallback(); 5379 } 5380 } 5381 } 5382 5383 /** 5384 * Returns true if this view has focus 5385 * 5386 * @return True if this view has focus, false otherwise. 5387 */ 5388 @ViewDebug.ExportedProperty(category = "focus") 5389 public boolean isFocused() { 5390 return (mPrivateFlags & PFLAG_FOCUSED) != 0; 5391 } 5392 5393 /** 5394 * Find the view in the hierarchy rooted at this view that currently has 5395 * focus. 5396 * 5397 * @return The view that currently has focus, or null if no focused view can 5398 * be found. 5399 */ 5400 public View findFocus() { 5401 return (mPrivateFlags & PFLAG_FOCUSED) != 0 ? this : null; 5402 } 5403 5404 /** 5405 * Indicates whether this view is one of the set of scrollable containers in 5406 * its window. 5407 * 5408 * @return whether this view is one of the set of scrollable containers in 5409 * its window 5410 * 5411 * @attr ref android.R.styleable#View_isScrollContainer 5412 */ 5413 public boolean isScrollContainer() { 5414 return (mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0; 5415 } 5416 5417 /** 5418 * Change whether this view is one of the set of scrollable containers in 5419 * its window. This will be used to determine whether the window can 5420 * resize or must pan when a soft input area is open -- scrollable 5421 * containers allow the window to use resize mode since the container 5422 * will appropriately shrink. 5423 * 5424 * @attr ref android.R.styleable#View_isScrollContainer 5425 */ 5426 public void setScrollContainer(boolean isScrollContainer) { 5427 if (isScrollContainer) { 5428 if (mAttachInfo != null && (mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) == 0) { 5429 mAttachInfo.mScrollContainers.add(this); 5430 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 5431 } 5432 mPrivateFlags |= PFLAG_SCROLL_CONTAINER; 5433 } else { 5434 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 5435 mAttachInfo.mScrollContainers.remove(this); 5436 } 5437 mPrivateFlags &= ~(PFLAG_SCROLL_CONTAINER|PFLAG_SCROLL_CONTAINER_ADDED); 5438 } 5439 } 5440 5441 /** 5442 * Returns the quality of the drawing cache. 5443 * 5444 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5445 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5446 * 5447 * @see #setDrawingCacheQuality(int) 5448 * @see #setDrawingCacheEnabled(boolean) 5449 * @see #isDrawingCacheEnabled() 5450 * 5451 * @attr ref android.R.styleable#View_drawingCacheQuality 5452 */ 5453 public int getDrawingCacheQuality() { 5454 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5455 } 5456 5457 /** 5458 * Set the drawing cache quality of this view. This value is used only when the 5459 * drawing cache is enabled 5460 * 5461 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5462 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5463 * 5464 * @see #getDrawingCacheQuality() 5465 * @see #setDrawingCacheEnabled(boolean) 5466 * @see #isDrawingCacheEnabled() 5467 * 5468 * @attr ref android.R.styleable#View_drawingCacheQuality 5469 */ 5470 public void setDrawingCacheQuality(int quality) { 5471 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5472 } 5473 5474 /** 5475 * Returns whether the screen should remain on, corresponding to the current 5476 * value of {@link #KEEP_SCREEN_ON}. 5477 * 5478 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5479 * 5480 * @see #setKeepScreenOn(boolean) 5481 * 5482 * @attr ref android.R.styleable#View_keepScreenOn 5483 */ 5484 public boolean getKeepScreenOn() { 5485 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5486 } 5487 5488 /** 5489 * Controls whether the screen should remain on, modifying the 5490 * value of {@link #KEEP_SCREEN_ON}. 5491 * 5492 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5493 * 5494 * @see #getKeepScreenOn() 5495 * 5496 * @attr ref android.R.styleable#View_keepScreenOn 5497 */ 5498 public void setKeepScreenOn(boolean keepScreenOn) { 5499 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5500 } 5501 5502 /** 5503 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5504 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5505 * 5506 * @attr ref android.R.styleable#View_nextFocusLeft 5507 */ 5508 public int getNextFocusLeftId() { 5509 return mNextFocusLeftId; 5510 } 5511 5512 /** 5513 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5514 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5515 * decide automatically. 5516 * 5517 * @attr ref android.R.styleable#View_nextFocusLeft 5518 */ 5519 public void setNextFocusLeftId(int nextFocusLeftId) { 5520 mNextFocusLeftId = nextFocusLeftId; 5521 } 5522 5523 /** 5524 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5525 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5526 * 5527 * @attr ref android.R.styleable#View_nextFocusRight 5528 */ 5529 public int getNextFocusRightId() { 5530 return mNextFocusRightId; 5531 } 5532 5533 /** 5534 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5535 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5536 * decide automatically. 5537 * 5538 * @attr ref android.R.styleable#View_nextFocusRight 5539 */ 5540 public void setNextFocusRightId(int nextFocusRightId) { 5541 mNextFocusRightId = nextFocusRightId; 5542 } 5543 5544 /** 5545 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5546 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5547 * 5548 * @attr ref android.R.styleable#View_nextFocusUp 5549 */ 5550 public int getNextFocusUpId() { 5551 return mNextFocusUpId; 5552 } 5553 5554 /** 5555 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5556 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5557 * decide automatically. 5558 * 5559 * @attr ref android.R.styleable#View_nextFocusUp 5560 */ 5561 public void setNextFocusUpId(int nextFocusUpId) { 5562 mNextFocusUpId = nextFocusUpId; 5563 } 5564 5565 /** 5566 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5567 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5568 * 5569 * @attr ref android.R.styleable#View_nextFocusDown 5570 */ 5571 public int getNextFocusDownId() { 5572 return mNextFocusDownId; 5573 } 5574 5575 /** 5576 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5577 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5578 * decide automatically. 5579 * 5580 * @attr ref android.R.styleable#View_nextFocusDown 5581 */ 5582 public void setNextFocusDownId(int nextFocusDownId) { 5583 mNextFocusDownId = nextFocusDownId; 5584 } 5585 5586 /** 5587 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5588 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5589 * 5590 * @attr ref android.R.styleable#View_nextFocusForward 5591 */ 5592 public int getNextFocusForwardId() { 5593 return mNextFocusForwardId; 5594 } 5595 5596 /** 5597 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5598 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5599 * decide automatically. 5600 * 5601 * @attr ref android.R.styleable#View_nextFocusForward 5602 */ 5603 public void setNextFocusForwardId(int nextFocusForwardId) { 5604 mNextFocusForwardId = nextFocusForwardId; 5605 } 5606 5607 /** 5608 * Returns the visibility of this view and all of its ancestors 5609 * 5610 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5611 */ 5612 public boolean isShown() { 5613 View current = this; 5614 //noinspection ConstantConditions 5615 do { 5616 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5617 return false; 5618 } 5619 ViewParent parent = current.mParent; 5620 if (parent == null) { 5621 return false; // We are not attached to the view root 5622 } 5623 if (!(parent instanceof View)) { 5624 return true; 5625 } 5626 current = (View) parent; 5627 } while (current != null); 5628 5629 return false; 5630 } 5631 5632 /** 5633 * Called by the view hierarchy when the content insets for a window have 5634 * changed, to allow it to adjust its content to fit within those windows. 5635 * The content insets tell you the space that the status bar, input method, 5636 * and other system windows infringe on the application's window. 5637 * 5638 * <p>You do not normally need to deal with this function, since the default 5639 * window decoration given to applications takes care of applying it to the 5640 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5641 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5642 * and your content can be placed under those system elements. You can then 5643 * use this method within your view hierarchy if you have parts of your UI 5644 * which you would like to ensure are not being covered. 5645 * 5646 * <p>The default implementation of this method simply applies the content 5647 * inset's to the view's padding, consuming that content (modifying the 5648 * insets to be 0), and returning true. This behavior is off by default, but can 5649 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5650 * 5651 * <p>This function's traversal down the hierarchy is depth-first. The same content 5652 * insets object is propagated down the hierarchy, so any changes made to it will 5653 * be seen by all following views (including potentially ones above in 5654 * the hierarchy since this is a depth-first traversal). The first view 5655 * that returns true will abort the entire traversal. 5656 * 5657 * <p>The default implementation works well for a situation where it is 5658 * used with a container that covers the entire window, allowing it to 5659 * apply the appropriate insets to its content on all edges. If you need 5660 * a more complicated layout (such as two different views fitting system 5661 * windows, one on the top of the window, and one on the bottom), 5662 * you can override the method and handle the insets however you would like. 5663 * Note that the insets provided by the framework are always relative to the 5664 * far edges of the window, not accounting for the location of the called view 5665 * within that window. (In fact when this method is called you do not yet know 5666 * where the layout will place the view, as it is done before layout happens.) 5667 * 5668 * <p>Note: unlike many View methods, there is no dispatch phase to this 5669 * call. If you are overriding it in a ViewGroup and want to allow the 5670 * call to continue to your children, you must be sure to call the super 5671 * implementation. 5672 * 5673 * <p>Here is a sample layout that makes use of fitting system windows 5674 * to have controls for a video view placed inside of the window decorations 5675 * that it hides and shows. This can be used with code like the second 5676 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5677 * 5678 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5679 * 5680 * @param insets Current content insets of the window. Prior to 5681 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5682 * the insets or else you and Android will be unhappy. 5683 * 5684 * @return Return true if this view applied the insets and it should not 5685 * continue propagating further down the hierarchy, false otherwise. 5686 * @see #getFitsSystemWindows() 5687 * @see #setFitsSystemWindows(boolean) 5688 * @see #setSystemUiVisibility(int) 5689 */ 5690 protected boolean fitSystemWindows(Rect insets) { 5691 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5692 mUserPaddingStart = UNDEFINED_PADDING; 5693 mUserPaddingEnd = UNDEFINED_PADDING; 5694 Rect localInsets = sThreadLocal.get(); 5695 if (localInsets == null) { 5696 localInsets = new Rect(); 5697 sThreadLocal.set(localInsets); 5698 } 5699 boolean res = computeFitSystemWindows(insets, localInsets); 5700 internalSetPadding(localInsets.left, localInsets.top, 5701 localInsets.right, localInsets.bottom); 5702 return res; 5703 } 5704 return false; 5705 } 5706 5707 /** 5708 * @hide Compute the insets that should be consumed by this view and the ones 5709 * that should propagate to those under it. 5710 */ 5711 protected boolean computeFitSystemWindows(Rect inoutInsets, Rect outLocalInsets) { 5712 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5713 || mAttachInfo == null 5714 || ((mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0 5715 && !mAttachInfo.mOverscanRequested)) { 5716 outLocalInsets.set(inoutInsets); 5717 inoutInsets.set(0, 0, 0, 0); 5718 return true; 5719 } else { 5720 // The application wants to take care of fitting system window for 5721 // the content... however we still need to take care of any overscan here. 5722 final Rect overscan = mAttachInfo.mOverscanInsets; 5723 outLocalInsets.set(overscan); 5724 inoutInsets.left -= overscan.left; 5725 inoutInsets.top -= overscan.top; 5726 inoutInsets.right -= overscan.right; 5727 inoutInsets.bottom -= overscan.bottom; 5728 return false; 5729 } 5730 } 5731 5732 /** 5733 * Sets whether or not this view should account for system screen decorations 5734 * such as the status bar and inset its content; that is, controlling whether 5735 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5736 * executed. See that method for more details. 5737 * 5738 * <p>Note that if you are providing your own implementation of 5739 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5740 * flag to true -- your implementation will be overriding the default 5741 * implementation that checks this flag. 5742 * 5743 * @param fitSystemWindows If true, then the default implementation of 5744 * {@link #fitSystemWindows(Rect)} will be executed. 5745 * 5746 * @attr ref android.R.styleable#View_fitsSystemWindows 5747 * @see #getFitsSystemWindows() 5748 * @see #fitSystemWindows(Rect) 5749 * @see #setSystemUiVisibility(int) 5750 */ 5751 public void setFitsSystemWindows(boolean fitSystemWindows) { 5752 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5753 } 5754 5755 /** 5756 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5757 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5758 * will be executed. 5759 * 5760 * @return Returns true if the default implementation of 5761 * {@link #fitSystemWindows(Rect)} will be executed. 5762 * 5763 * @attr ref android.R.styleable#View_fitsSystemWindows 5764 * @see #setFitsSystemWindows() 5765 * @see #fitSystemWindows(Rect) 5766 * @see #setSystemUiVisibility(int) 5767 */ 5768 public boolean getFitsSystemWindows() { 5769 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5770 } 5771 5772 /** @hide */ 5773 public boolean fitsSystemWindows() { 5774 return getFitsSystemWindows(); 5775 } 5776 5777 /** 5778 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5779 */ 5780 public void requestFitSystemWindows() { 5781 if (mParent != null) { 5782 mParent.requestFitSystemWindows(); 5783 } 5784 } 5785 5786 /** 5787 * For use by PhoneWindow to make its own system window fitting optional. 5788 * @hide 5789 */ 5790 public void makeOptionalFitsSystemWindows() { 5791 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5792 } 5793 5794 /** 5795 * Returns the visibility status for this view. 5796 * 5797 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5798 * @attr ref android.R.styleable#View_visibility 5799 */ 5800 @ViewDebug.ExportedProperty(mapping = { 5801 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5802 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5803 @ViewDebug.IntToString(from = GONE, to = "GONE") 5804 }) 5805 public int getVisibility() { 5806 return mViewFlags & VISIBILITY_MASK; 5807 } 5808 5809 /** 5810 * Set the enabled state of this view. 5811 * 5812 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5813 * @attr ref android.R.styleable#View_visibility 5814 */ 5815 @RemotableViewMethod 5816 public void setVisibility(int visibility) { 5817 setFlags(visibility, VISIBILITY_MASK); 5818 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5819 } 5820 5821 /** 5822 * Returns the enabled status for this view. The interpretation of the 5823 * enabled state varies by subclass. 5824 * 5825 * @return True if this view is enabled, false otherwise. 5826 */ 5827 @ViewDebug.ExportedProperty 5828 public boolean isEnabled() { 5829 return (mViewFlags & ENABLED_MASK) == ENABLED; 5830 } 5831 5832 /** 5833 * Set the enabled state of this view. The interpretation of the enabled 5834 * state varies by subclass. 5835 * 5836 * @param enabled True if this view is enabled, false otherwise. 5837 */ 5838 @RemotableViewMethod 5839 public void setEnabled(boolean enabled) { 5840 if (enabled == isEnabled()) return; 5841 5842 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5843 5844 /* 5845 * The View most likely has to change its appearance, so refresh 5846 * the drawable state. 5847 */ 5848 refreshDrawableState(); 5849 5850 // Invalidate too, since the default behavior for views is to be 5851 // be drawn at 50% alpha rather than to change the drawable. 5852 invalidate(true); 5853 } 5854 5855 /** 5856 * Set whether this view can receive the focus. 5857 * 5858 * Setting this to false will also ensure that this view is not focusable 5859 * in touch mode. 5860 * 5861 * @param focusable If true, this view can receive the focus. 5862 * 5863 * @see #setFocusableInTouchMode(boolean) 5864 * @attr ref android.R.styleable#View_focusable 5865 */ 5866 public void setFocusable(boolean focusable) { 5867 if (!focusable) { 5868 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5869 } 5870 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5871 } 5872 5873 /** 5874 * Set whether this view can receive focus while in touch mode. 5875 * 5876 * Setting this to true will also ensure that this view is focusable. 5877 * 5878 * @param focusableInTouchMode If true, this view can receive the focus while 5879 * in touch mode. 5880 * 5881 * @see #setFocusable(boolean) 5882 * @attr ref android.R.styleable#View_focusableInTouchMode 5883 */ 5884 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5885 // Focusable in touch mode should always be set before the focusable flag 5886 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5887 // which, in touch mode, will not successfully request focus on this view 5888 // because the focusable in touch mode flag is not set 5889 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5890 if (focusableInTouchMode) { 5891 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5892 } 5893 } 5894 5895 /** 5896 * Set whether this view should have sound effects enabled for events such as 5897 * clicking and touching. 5898 * 5899 * <p>You may wish to disable sound effects for a view if you already play sounds, 5900 * for instance, a dial key that plays dtmf tones. 5901 * 5902 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5903 * @see #isSoundEffectsEnabled() 5904 * @see #playSoundEffect(int) 5905 * @attr ref android.R.styleable#View_soundEffectsEnabled 5906 */ 5907 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5908 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5909 } 5910 5911 /** 5912 * @return whether this view should have sound effects enabled for events such as 5913 * clicking and touching. 5914 * 5915 * @see #setSoundEffectsEnabled(boolean) 5916 * @see #playSoundEffect(int) 5917 * @attr ref android.R.styleable#View_soundEffectsEnabled 5918 */ 5919 @ViewDebug.ExportedProperty 5920 public boolean isSoundEffectsEnabled() { 5921 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5922 } 5923 5924 /** 5925 * Set whether this view should have haptic feedback for events such as 5926 * long presses. 5927 * 5928 * <p>You may wish to disable haptic feedback if your view already controls 5929 * its own haptic feedback. 5930 * 5931 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5932 * @see #isHapticFeedbackEnabled() 5933 * @see #performHapticFeedback(int) 5934 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5935 */ 5936 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5937 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5938 } 5939 5940 /** 5941 * @return whether this view should have haptic feedback enabled for events 5942 * long presses. 5943 * 5944 * @see #setHapticFeedbackEnabled(boolean) 5945 * @see #performHapticFeedback(int) 5946 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5947 */ 5948 @ViewDebug.ExportedProperty 5949 public boolean isHapticFeedbackEnabled() { 5950 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5951 } 5952 5953 /** 5954 * Returns the layout direction for this view. 5955 * 5956 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5957 * {@link #LAYOUT_DIRECTION_RTL}, 5958 * {@link #LAYOUT_DIRECTION_INHERIT} or 5959 * {@link #LAYOUT_DIRECTION_LOCALE}. 5960 * 5961 * @attr ref android.R.styleable#View_layoutDirection 5962 * 5963 * @hide 5964 */ 5965 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5966 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5967 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5968 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5969 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5970 }) 5971 public int getRawLayoutDirection() { 5972 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT; 5973 } 5974 5975 /** 5976 * Set the layout direction for this view. This will propagate a reset of layout direction 5977 * resolution to the view's children and resolve layout direction for this view. 5978 * 5979 * @param layoutDirection the layout direction to set. Should be one of: 5980 * 5981 * {@link #LAYOUT_DIRECTION_LTR}, 5982 * {@link #LAYOUT_DIRECTION_RTL}, 5983 * {@link #LAYOUT_DIRECTION_INHERIT}, 5984 * {@link #LAYOUT_DIRECTION_LOCALE}. 5985 * 5986 * Resolution will be done if the value is set to LAYOUT_DIRECTION_INHERIT. The resolution 5987 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 5988 * will return the default {@link #LAYOUT_DIRECTION_LTR}. 5989 * 5990 * @attr ref android.R.styleable#View_layoutDirection 5991 */ 5992 @RemotableViewMethod 5993 public void setLayoutDirection(int layoutDirection) { 5994 if (getRawLayoutDirection() != layoutDirection) { 5995 // Reset the current layout direction and the resolved one 5996 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_MASK; 5997 resetRtlProperties(); 5998 // Set the new layout direction (filtered) 5999 mPrivateFlags2 |= 6000 ((layoutDirection << PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) & PFLAG2_LAYOUT_DIRECTION_MASK); 6001 // We need to resolve all RTL properties as they all depend on layout direction 6002 resolveRtlPropertiesIfNeeded(); 6003 requestLayout(); 6004 invalidate(true); 6005 } 6006 } 6007 6008 /** 6009 * Returns the resolved layout direction for this view. 6010 * 6011 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 6012 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 6013 * 6014 * For compatibility, this will return {@link #LAYOUT_DIRECTION_LTR} if API version 6015 * is lower than {@link android.os.Build.VERSION_CODES#JELLY_BEAN_MR1}. 6016 * 6017 * @attr ref android.R.styleable#View_layoutDirection 6018 */ 6019 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6020 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 6021 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 6022 }) 6023 public int getLayoutDirection() { 6024 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 6025 if (targetSdkVersion < JELLY_BEAN_MR1) { 6026 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 6027 return LAYOUT_DIRECTION_RESOLVED_DEFAULT; 6028 } 6029 return ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) == 6030 PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL) ? LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 6031 } 6032 6033 /** 6034 * Indicates whether or not this view's layout is right-to-left. This is resolved from 6035 * layout attribute and/or the inherited value from the parent 6036 * 6037 * @return true if the layout is right-to-left. 6038 * 6039 * @hide 6040 */ 6041 @ViewDebug.ExportedProperty(category = "layout") 6042 public boolean isLayoutRtl() { 6043 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL); 6044 } 6045 6046 /** 6047 * Indicates whether the view is currently tracking transient state that the 6048 * app should not need to concern itself with saving and restoring, but that 6049 * the framework should take special note to preserve when possible. 6050 * 6051 * <p>A view with transient state cannot be trivially rebound from an external 6052 * data source, such as an adapter binding item views in a list. This may be 6053 * because the view is performing an animation, tracking user selection 6054 * of content, or similar.</p> 6055 * 6056 * @return true if the view has transient state 6057 */ 6058 @ViewDebug.ExportedProperty(category = "layout") 6059 public boolean hasTransientState() { 6060 return (mPrivateFlags2 & PFLAG2_HAS_TRANSIENT_STATE) == PFLAG2_HAS_TRANSIENT_STATE; 6061 } 6062 6063 /** 6064 * Set whether this view is currently tracking transient state that the 6065 * framework should attempt to preserve when possible. This flag is reference counted, 6066 * so every call to setHasTransientState(true) should be paired with a later call 6067 * to setHasTransientState(false). 6068 * 6069 * <p>A view with transient state cannot be trivially rebound from an external 6070 * data source, such as an adapter binding item views in a list. This may be 6071 * because the view is performing an animation, tracking user selection 6072 * of content, or similar.</p> 6073 * 6074 * @param hasTransientState true if this view has transient state 6075 */ 6076 public void setHasTransientState(boolean hasTransientState) { 6077 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 6078 mTransientStateCount - 1; 6079 if (mTransientStateCount < 0) { 6080 mTransientStateCount = 0; 6081 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 6082 "unmatched pair of setHasTransientState calls"); 6083 } else if ((hasTransientState && mTransientStateCount == 1) || 6084 (!hasTransientState && mTransientStateCount == 0)) { 6085 // update flag if we've just incremented up from 0 or decremented down to 0 6086 mPrivateFlags2 = (mPrivateFlags2 & ~PFLAG2_HAS_TRANSIENT_STATE) | 6087 (hasTransientState ? PFLAG2_HAS_TRANSIENT_STATE : 0); 6088 if (mParent != null) { 6089 try { 6090 mParent.childHasTransientStateChanged(this, hasTransientState); 6091 } catch (AbstractMethodError e) { 6092 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 6093 " does not fully implement ViewParent", e); 6094 } 6095 } 6096 } 6097 } 6098 6099 /** 6100 * If this view doesn't do any drawing on its own, set this flag to 6101 * allow further optimizations. By default, this flag is not set on 6102 * View, but could be set on some View subclasses such as ViewGroup. 6103 * 6104 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 6105 * you should clear this flag. 6106 * 6107 * @param willNotDraw whether or not this View draw on its own 6108 */ 6109 public void setWillNotDraw(boolean willNotDraw) { 6110 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 6111 } 6112 6113 /** 6114 * Returns whether or not this View draws on its own. 6115 * 6116 * @return true if this view has nothing to draw, false otherwise 6117 */ 6118 @ViewDebug.ExportedProperty(category = "drawing") 6119 public boolean willNotDraw() { 6120 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 6121 } 6122 6123 /** 6124 * When a View's drawing cache is enabled, drawing is redirected to an 6125 * offscreen bitmap. Some views, like an ImageView, must be able to 6126 * bypass this mechanism if they already draw a single bitmap, to avoid 6127 * unnecessary usage of the memory. 6128 * 6129 * @param willNotCacheDrawing true if this view does not cache its 6130 * drawing, false otherwise 6131 */ 6132 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 6133 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 6134 } 6135 6136 /** 6137 * Returns whether or not this View can cache its drawing or not. 6138 * 6139 * @return true if this view does not cache its drawing, false otherwise 6140 */ 6141 @ViewDebug.ExportedProperty(category = "drawing") 6142 public boolean willNotCacheDrawing() { 6143 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 6144 } 6145 6146 /** 6147 * Indicates whether this view reacts to click events or not. 6148 * 6149 * @return true if the view is clickable, false otherwise 6150 * 6151 * @see #setClickable(boolean) 6152 * @attr ref android.R.styleable#View_clickable 6153 */ 6154 @ViewDebug.ExportedProperty 6155 public boolean isClickable() { 6156 return (mViewFlags & CLICKABLE) == CLICKABLE; 6157 } 6158 6159 /** 6160 * Enables or disables click events for this view. When a view 6161 * is clickable it will change its state to "pressed" on every click. 6162 * Subclasses should set the view clickable to visually react to 6163 * user's clicks. 6164 * 6165 * @param clickable true to make the view clickable, false otherwise 6166 * 6167 * @see #isClickable() 6168 * @attr ref android.R.styleable#View_clickable 6169 */ 6170 public void setClickable(boolean clickable) { 6171 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 6172 } 6173 6174 /** 6175 * Indicates whether this view reacts to long click events or not. 6176 * 6177 * @return true if the view is long clickable, false otherwise 6178 * 6179 * @see #setLongClickable(boolean) 6180 * @attr ref android.R.styleable#View_longClickable 6181 */ 6182 public boolean isLongClickable() { 6183 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6184 } 6185 6186 /** 6187 * Enables or disables long click events for this view. When a view is long 6188 * clickable it reacts to the user holding down the button for a longer 6189 * duration than a tap. This event can either launch the listener or a 6190 * context menu. 6191 * 6192 * @param longClickable true to make the view long clickable, false otherwise 6193 * @see #isLongClickable() 6194 * @attr ref android.R.styleable#View_longClickable 6195 */ 6196 public void setLongClickable(boolean longClickable) { 6197 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 6198 } 6199 6200 /** 6201 * Sets the pressed state for this view. 6202 * 6203 * @see #isClickable() 6204 * @see #setClickable(boolean) 6205 * 6206 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 6207 * the View's internal state from a previously set "pressed" state. 6208 */ 6209 public void setPressed(boolean pressed) { 6210 final boolean needsRefresh = pressed != ((mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED); 6211 6212 if (pressed) { 6213 mPrivateFlags |= PFLAG_PRESSED; 6214 } else { 6215 mPrivateFlags &= ~PFLAG_PRESSED; 6216 } 6217 6218 if (needsRefresh) { 6219 refreshDrawableState(); 6220 } 6221 dispatchSetPressed(pressed); 6222 } 6223 6224 /** 6225 * Dispatch setPressed to all of this View's children. 6226 * 6227 * @see #setPressed(boolean) 6228 * 6229 * @param pressed The new pressed state 6230 */ 6231 protected void dispatchSetPressed(boolean pressed) { 6232 } 6233 6234 /** 6235 * Indicates whether the view is currently in pressed state. Unless 6236 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 6237 * the pressed state. 6238 * 6239 * @see #setPressed(boolean) 6240 * @see #isClickable() 6241 * @see #setClickable(boolean) 6242 * 6243 * @return true if the view is currently pressed, false otherwise 6244 */ 6245 public boolean isPressed() { 6246 return (mPrivateFlags & PFLAG_PRESSED) == PFLAG_PRESSED; 6247 } 6248 6249 /** 6250 * Indicates whether this view will save its state (that is, 6251 * whether its {@link #onSaveInstanceState} method will be called). 6252 * 6253 * @return Returns true if the view state saving is enabled, else false. 6254 * 6255 * @see #setSaveEnabled(boolean) 6256 * @attr ref android.R.styleable#View_saveEnabled 6257 */ 6258 public boolean isSaveEnabled() { 6259 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 6260 } 6261 6262 /** 6263 * Controls whether the saving of this view's state is 6264 * enabled (that is, whether its {@link #onSaveInstanceState} method 6265 * will be called). Note that even if freezing is enabled, the 6266 * view still must have an id assigned to it (via {@link #setId(int)}) 6267 * for its state to be saved. This flag can only disable the 6268 * saving of this view; any child views may still have their state saved. 6269 * 6270 * @param enabled Set to false to <em>disable</em> state saving, or true 6271 * (the default) to allow it. 6272 * 6273 * @see #isSaveEnabled() 6274 * @see #setId(int) 6275 * @see #onSaveInstanceState() 6276 * @attr ref android.R.styleable#View_saveEnabled 6277 */ 6278 public void setSaveEnabled(boolean enabled) { 6279 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 6280 } 6281 6282 /** 6283 * Gets whether the framework should discard touches when the view's 6284 * window is obscured by another visible window. 6285 * Refer to the {@link View} security documentation for more details. 6286 * 6287 * @return True if touch filtering is enabled. 6288 * 6289 * @see #setFilterTouchesWhenObscured(boolean) 6290 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6291 */ 6292 @ViewDebug.ExportedProperty 6293 public boolean getFilterTouchesWhenObscured() { 6294 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 6295 } 6296 6297 /** 6298 * Sets whether the framework should discard touches when the view's 6299 * window is obscured by another visible window. 6300 * Refer to the {@link View} security documentation for more details. 6301 * 6302 * @param enabled True if touch filtering should be enabled. 6303 * 6304 * @see #getFilterTouchesWhenObscured 6305 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 6306 */ 6307 public void setFilterTouchesWhenObscured(boolean enabled) { 6308 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 6309 FILTER_TOUCHES_WHEN_OBSCURED); 6310 } 6311 6312 /** 6313 * Indicates whether the entire hierarchy under this view will save its 6314 * state when a state saving traversal occurs from its parent. The default 6315 * is true; if false, these views will not be saved unless 6316 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6317 * 6318 * @return Returns true if the view state saving from parent is enabled, else false. 6319 * 6320 * @see #setSaveFromParentEnabled(boolean) 6321 */ 6322 public boolean isSaveFromParentEnabled() { 6323 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 6324 } 6325 6326 /** 6327 * Controls whether the entire hierarchy under this view will save its 6328 * state when a state saving traversal occurs from its parent. The default 6329 * is true; if false, these views will not be saved unless 6330 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 6331 * 6332 * @param enabled Set to false to <em>disable</em> state saving, or true 6333 * (the default) to allow it. 6334 * 6335 * @see #isSaveFromParentEnabled() 6336 * @see #setId(int) 6337 * @see #onSaveInstanceState() 6338 */ 6339 public void setSaveFromParentEnabled(boolean enabled) { 6340 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 6341 } 6342 6343 6344 /** 6345 * Returns whether this View is able to take focus. 6346 * 6347 * @return True if this view can take focus, or false otherwise. 6348 * @attr ref android.R.styleable#View_focusable 6349 */ 6350 @ViewDebug.ExportedProperty(category = "focus") 6351 public final boolean isFocusable() { 6352 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 6353 } 6354 6355 /** 6356 * When a view is focusable, it may not want to take focus when in touch mode. 6357 * For example, a button would like focus when the user is navigating via a D-pad 6358 * so that the user can click on it, but once the user starts touching the screen, 6359 * the button shouldn't take focus 6360 * @return Whether the view is focusable in touch mode. 6361 * @attr ref android.R.styleable#View_focusableInTouchMode 6362 */ 6363 @ViewDebug.ExportedProperty 6364 public final boolean isFocusableInTouchMode() { 6365 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 6366 } 6367 6368 /** 6369 * Find the nearest view in the specified direction that can take focus. 6370 * This does not actually give focus to that view. 6371 * 6372 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6373 * 6374 * @return The nearest focusable in the specified direction, or null if none 6375 * can be found. 6376 */ 6377 public View focusSearch(int direction) { 6378 if (mParent != null) { 6379 return mParent.focusSearch(this, direction); 6380 } else { 6381 return null; 6382 } 6383 } 6384 6385 /** 6386 * This method is the last chance for the focused view and its ancestors to 6387 * respond to an arrow key. This is called when the focused view did not 6388 * consume the key internally, nor could the view system find a new view in 6389 * the requested direction to give focus to. 6390 * 6391 * @param focused The currently focused view. 6392 * @param direction The direction focus wants to move. One of FOCUS_UP, 6393 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 6394 * @return True if the this view consumed this unhandled move. 6395 */ 6396 public boolean dispatchUnhandledMove(View focused, int direction) { 6397 return false; 6398 } 6399 6400 /** 6401 * If a user manually specified the next view id for a particular direction, 6402 * use the root to look up the view. 6403 * @param root The root view of the hierarchy containing this view. 6404 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 6405 * or FOCUS_BACKWARD. 6406 * @return The user specified next view, or null if there is none. 6407 */ 6408 View findUserSetNextFocus(View root, int direction) { 6409 switch (direction) { 6410 case FOCUS_LEFT: 6411 if (mNextFocusLeftId == View.NO_ID) return null; 6412 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 6413 case FOCUS_RIGHT: 6414 if (mNextFocusRightId == View.NO_ID) return null; 6415 return findViewInsideOutShouldExist(root, mNextFocusRightId); 6416 case FOCUS_UP: 6417 if (mNextFocusUpId == View.NO_ID) return null; 6418 return findViewInsideOutShouldExist(root, mNextFocusUpId); 6419 case FOCUS_DOWN: 6420 if (mNextFocusDownId == View.NO_ID) return null; 6421 return findViewInsideOutShouldExist(root, mNextFocusDownId); 6422 case FOCUS_FORWARD: 6423 if (mNextFocusForwardId == View.NO_ID) return null; 6424 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 6425 case FOCUS_BACKWARD: { 6426 if (mID == View.NO_ID) return null; 6427 final int id = mID; 6428 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6429 @Override 6430 public boolean apply(View t) { 6431 return t.mNextFocusForwardId == id; 6432 } 6433 }); 6434 } 6435 } 6436 return null; 6437 } 6438 6439 private View findViewInsideOutShouldExist(View root, int id) { 6440 if (mMatchIdPredicate == null) { 6441 mMatchIdPredicate = new MatchIdPredicate(); 6442 } 6443 mMatchIdPredicate.mId = id; 6444 View result = root.findViewByPredicateInsideOut(this, mMatchIdPredicate); 6445 if (result == null) { 6446 Log.w(VIEW_LOG_TAG, "couldn't find view with id " + id); 6447 } 6448 return result; 6449 } 6450 6451 /** 6452 * Find and return all focusable views that are descendants of this view, 6453 * possibly including this view if it is focusable itself. 6454 * 6455 * @param direction The direction of the focus 6456 * @return A list of focusable views 6457 */ 6458 public ArrayList<View> getFocusables(int direction) { 6459 ArrayList<View> result = new ArrayList<View>(24); 6460 addFocusables(result, direction); 6461 return result; 6462 } 6463 6464 /** 6465 * Add any focusable views that are descendants of this view (possibly 6466 * including this view if it is focusable itself) to views. If we are in touch mode, 6467 * only add views that are also focusable in touch mode. 6468 * 6469 * @param views Focusable views found so far 6470 * @param direction The direction of the focus 6471 */ 6472 public void addFocusables(ArrayList<View> views, int direction) { 6473 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6474 } 6475 6476 /** 6477 * Adds any focusable views that are descendants of this view (possibly 6478 * including this view if it is focusable itself) to views. This method 6479 * adds all focusable views regardless if we are in touch mode or 6480 * only views focusable in touch mode if we are in touch mode or 6481 * only views that can take accessibility focus if accessibility is enabeld 6482 * depending on the focusable mode paramater. 6483 * 6484 * @param views Focusable views found so far or null if all we are interested is 6485 * the number of focusables. 6486 * @param direction The direction of the focus. 6487 * @param focusableMode The type of focusables to be added. 6488 * 6489 * @see #FOCUSABLES_ALL 6490 * @see #FOCUSABLES_TOUCH_MODE 6491 */ 6492 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6493 if (views == null) { 6494 return; 6495 } 6496 if (!isFocusable()) { 6497 return; 6498 } 6499 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6500 && isInTouchMode() && !isFocusableInTouchMode()) { 6501 return; 6502 } 6503 views.add(this); 6504 } 6505 6506 /** 6507 * Finds the Views that contain given text. The containment is case insensitive. 6508 * The search is performed by either the text that the View renders or the content 6509 * description that describes the view for accessibility purposes and the view does 6510 * not render or both. Clients can specify how the search is to be performed via 6511 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6512 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6513 * 6514 * @param outViews The output list of matching Views. 6515 * @param searched The text to match against. 6516 * 6517 * @see #FIND_VIEWS_WITH_TEXT 6518 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6519 * @see #setContentDescription(CharSequence) 6520 */ 6521 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6522 if (getAccessibilityNodeProvider() != null) { 6523 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6524 outViews.add(this); 6525 } 6526 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6527 && (searched != null && searched.length() > 0) 6528 && (mContentDescription != null && mContentDescription.length() > 0)) { 6529 String searchedLowerCase = searched.toString().toLowerCase(); 6530 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6531 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6532 outViews.add(this); 6533 } 6534 } 6535 } 6536 6537 /** 6538 * Find and return all touchable views that are descendants of this view, 6539 * possibly including this view if it is touchable itself. 6540 * 6541 * @return A list of touchable views 6542 */ 6543 public ArrayList<View> getTouchables() { 6544 ArrayList<View> result = new ArrayList<View>(); 6545 addTouchables(result); 6546 return result; 6547 } 6548 6549 /** 6550 * Add any touchable views that are descendants of this view (possibly 6551 * including this view if it is touchable itself) to views. 6552 * 6553 * @param views Touchable views found so far 6554 */ 6555 public void addTouchables(ArrayList<View> views) { 6556 final int viewFlags = mViewFlags; 6557 6558 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6559 && (viewFlags & ENABLED_MASK) == ENABLED) { 6560 views.add(this); 6561 } 6562 } 6563 6564 /** 6565 * Returns whether this View is accessibility focused. 6566 * 6567 * @return True if this View is accessibility focused. 6568 */ 6569 boolean isAccessibilityFocused() { 6570 return (mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0; 6571 } 6572 6573 /** 6574 * Call this to try to give accessibility focus to this view. 6575 * 6576 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6577 * returns false or the view is no visible or the view already has accessibility 6578 * focus. 6579 * 6580 * See also {@link #focusSearch(int)}, which is what you call to say that you 6581 * have focus, and you want your parent to look for the next one. 6582 * 6583 * @return Whether this view actually took accessibility focus. 6584 * 6585 * @hide 6586 */ 6587 public boolean requestAccessibilityFocus() { 6588 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6589 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6590 return false; 6591 } 6592 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6593 return false; 6594 } 6595 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) == 0) { 6596 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_FOCUSED; 6597 ViewRootImpl viewRootImpl = getViewRootImpl(); 6598 if (viewRootImpl != null) { 6599 viewRootImpl.setAccessibilityFocus(this, null); 6600 } 6601 invalidate(); 6602 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6603 notifyAccessibilityStateChanged(); 6604 return true; 6605 } 6606 return false; 6607 } 6608 6609 /** 6610 * Call this to try to clear accessibility focus of this view. 6611 * 6612 * See also {@link #focusSearch(int)}, which is what you call to say that you 6613 * have focus, and you want your parent to look for the next one. 6614 * 6615 * @hide 6616 */ 6617 public void clearAccessibilityFocus() { 6618 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6619 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6620 invalidate(); 6621 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6622 notifyAccessibilityStateChanged(); 6623 } 6624 // Clear the global reference of accessibility focus if this 6625 // view or any of its descendants had accessibility focus. 6626 ViewRootImpl viewRootImpl = getViewRootImpl(); 6627 if (viewRootImpl != null) { 6628 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6629 if (focusHost != null && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6630 viewRootImpl.setAccessibilityFocus(null, null); 6631 } 6632 } 6633 } 6634 6635 private void sendAccessibilityHoverEvent(int eventType) { 6636 // Since we are not delivering to a client accessibility events from not 6637 // important views (unless the clinet request that) we need to fire the 6638 // event from the deepest view exposed to the client. As a consequence if 6639 // the user crosses a not exposed view the client will see enter and exit 6640 // of the exposed predecessor followed by and enter and exit of that same 6641 // predecessor when entering and exiting the not exposed descendant. This 6642 // is fine since the client has a clear idea which view is hovered at the 6643 // price of a couple more events being sent. This is a simple and 6644 // working solution. 6645 View source = this; 6646 while (true) { 6647 if (source.includeForAccessibility()) { 6648 source.sendAccessibilityEvent(eventType); 6649 return; 6650 } 6651 ViewParent parent = source.getParent(); 6652 if (parent instanceof View) { 6653 source = (View) parent; 6654 } else { 6655 return; 6656 } 6657 } 6658 } 6659 6660 /** 6661 * Clears accessibility focus without calling any callback methods 6662 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6663 * is used for clearing accessibility focus when giving this focus to 6664 * another view. 6665 */ 6666 void clearAccessibilityFocusNoCallbacks() { 6667 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_FOCUSED) != 0) { 6668 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_FOCUSED; 6669 invalidate(); 6670 } 6671 } 6672 6673 /** 6674 * Call this to try to give focus to a specific view or to one of its 6675 * descendants. 6676 * 6677 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6678 * false), or if it is focusable and it is not focusable in touch mode 6679 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6680 * 6681 * See also {@link #focusSearch(int)}, which is what you call to say that you 6682 * have focus, and you want your parent to look for the next one. 6683 * 6684 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6685 * {@link #FOCUS_DOWN} and <code>null</code>. 6686 * 6687 * @return Whether this view or one of its descendants actually took focus. 6688 */ 6689 public final boolean requestFocus() { 6690 return requestFocus(View.FOCUS_DOWN); 6691 } 6692 6693 /** 6694 * Call this to try to give focus to a specific view or to one of its 6695 * descendants and give it a hint about what direction focus is heading. 6696 * 6697 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6698 * false), or if it is focusable and it is not focusable in touch mode 6699 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6700 * 6701 * See also {@link #focusSearch(int)}, which is what you call to say that you 6702 * have focus, and you want your parent to look for the next one. 6703 * 6704 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6705 * <code>null</code> set for the previously focused rectangle. 6706 * 6707 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6708 * @return Whether this view or one of its descendants actually took focus. 6709 */ 6710 public final boolean requestFocus(int direction) { 6711 return requestFocus(direction, null); 6712 } 6713 6714 /** 6715 * Call this to try to give focus to a specific view or to one of its descendants 6716 * and give it hints about the direction and a specific rectangle that the focus 6717 * is coming from. The rectangle can help give larger views a finer grained hint 6718 * about where focus is coming from, and therefore, where to show selection, or 6719 * forward focus change internally. 6720 * 6721 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6722 * false), or if it is focusable and it is not focusable in touch mode 6723 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6724 * 6725 * A View will not take focus if it is not visible. 6726 * 6727 * A View will not take focus if one of its parents has 6728 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6729 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6730 * 6731 * See also {@link #focusSearch(int)}, which is what you call to say that you 6732 * have focus, and you want your parent to look for the next one. 6733 * 6734 * You may wish to override this method if your custom {@link View} has an internal 6735 * {@link View} that it wishes to forward the request to. 6736 * 6737 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6738 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6739 * to give a finer grained hint about where focus is coming from. May be null 6740 * if there is no hint. 6741 * @return Whether this view or one of its descendants actually took focus. 6742 */ 6743 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6744 return requestFocusNoSearch(direction, previouslyFocusedRect); 6745 } 6746 6747 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6748 // need to be focusable 6749 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6750 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6751 return false; 6752 } 6753 6754 // need to be focusable in touch mode if in touch mode 6755 if (isInTouchMode() && 6756 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6757 return false; 6758 } 6759 6760 // need to not have any parents blocking us 6761 if (hasAncestorThatBlocksDescendantFocus()) { 6762 return false; 6763 } 6764 6765 handleFocusGainInternal(direction, previouslyFocusedRect); 6766 return true; 6767 } 6768 6769 /** 6770 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6771 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6772 * touch mode to request focus when they are touched. 6773 * 6774 * @return Whether this view or one of its descendants actually took focus. 6775 * 6776 * @see #isInTouchMode() 6777 * 6778 */ 6779 public final boolean requestFocusFromTouch() { 6780 // Leave touch mode if we need to 6781 if (isInTouchMode()) { 6782 ViewRootImpl viewRoot = getViewRootImpl(); 6783 if (viewRoot != null) { 6784 viewRoot.ensureTouchMode(false); 6785 } 6786 } 6787 return requestFocus(View.FOCUS_DOWN); 6788 } 6789 6790 /** 6791 * @return Whether any ancestor of this view blocks descendant focus. 6792 */ 6793 private boolean hasAncestorThatBlocksDescendantFocus() { 6794 ViewParent ancestor = mParent; 6795 while (ancestor instanceof ViewGroup) { 6796 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6797 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6798 return true; 6799 } else { 6800 ancestor = vgAncestor.getParent(); 6801 } 6802 } 6803 return false; 6804 } 6805 6806 /** 6807 * Gets the mode for determining whether this View is important for accessibility 6808 * which is if it fires accessibility events and if it is reported to 6809 * accessibility services that query the screen. 6810 * 6811 * @return The mode for determining whether a View is important for accessibility. 6812 * 6813 * @attr ref android.R.styleable#View_importantForAccessibility 6814 * 6815 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6816 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6817 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6818 */ 6819 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6820 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, to = "auto"), 6821 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, to = "yes"), 6822 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, to = "no") 6823 }) 6824 public int getImportantForAccessibility() { 6825 return (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6826 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6827 } 6828 6829 /** 6830 * Sets how to determine whether this view is important for accessibility 6831 * which is if it fires accessibility events and if it is reported to 6832 * accessibility services that query the screen. 6833 * 6834 * @param mode How to determine whether this view is important for accessibility. 6835 * 6836 * @attr ref android.R.styleable#View_importantForAccessibility 6837 * 6838 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6839 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6840 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6841 */ 6842 public void setImportantForAccessibility(int mode) { 6843 if (mode != getImportantForAccessibility()) { 6844 mPrivateFlags2 &= ~PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6845 mPrivateFlags2 |= (mode << PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6846 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK; 6847 notifyAccessibilityStateChanged(); 6848 } 6849 } 6850 6851 /** 6852 * Gets whether this view should be exposed for accessibility. 6853 * 6854 * @return Whether the view is exposed for accessibility. 6855 * 6856 * @hide 6857 */ 6858 public boolean isImportantForAccessibility() { 6859 final int mode = (mPrivateFlags2 & PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_MASK) 6860 >> PFLAG2_IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6861 switch (mode) { 6862 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6863 return true; 6864 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6865 return false; 6866 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6867 return isActionableForAccessibility() || hasListenersForAccessibility() 6868 || getAccessibilityNodeProvider() != null; 6869 default: 6870 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6871 + mode); 6872 } 6873 } 6874 6875 /** 6876 * Gets the parent for accessibility purposes. Note that the parent for 6877 * accessibility is not necessary the immediate parent. It is the first 6878 * predecessor that is important for accessibility. 6879 * 6880 * @return The parent for accessibility purposes. 6881 */ 6882 public ViewParent getParentForAccessibility() { 6883 if (mParent instanceof View) { 6884 View parentView = (View) mParent; 6885 if (parentView.includeForAccessibility()) { 6886 return mParent; 6887 } else { 6888 return mParent.getParentForAccessibility(); 6889 } 6890 } 6891 return null; 6892 } 6893 6894 /** 6895 * Adds the children of a given View for accessibility. Since some Views are 6896 * not important for accessibility the children for accessibility are not 6897 * necessarily direct children of the view, rather they are the first level of 6898 * descendants important for accessibility. 6899 * 6900 * @param children The list of children for accessibility. 6901 */ 6902 public void addChildrenForAccessibility(ArrayList<View> children) { 6903 if (includeForAccessibility()) { 6904 children.add(this); 6905 } 6906 } 6907 6908 /** 6909 * Whether to regard this view for accessibility. A view is regarded for 6910 * accessibility if it is important for accessibility or the querying 6911 * accessibility service has explicitly requested that view not 6912 * important for accessibility are regarded. 6913 * 6914 * @return Whether to regard the view for accessibility. 6915 * 6916 * @hide 6917 */ 6918 public boolean includeForAccessibility() { 6919 if (mAttachInfo != null) { 6920 return (mAttachInfo.mAccessibilityFetchFlags 6921 & AccessibilityNodeInfo.FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0 6922 || isImportantForAccessibility(); 6923 } 6924 return false; 6925 } 6926 6927 /** 6928 * Returns whether the View is considered actionable from 6929 * accessibility perspective. Such view are important for 6930 * accessibility. 6931 * 6932 * @return True if the view is actionable for accessibility. 6933 * 6934 * @hide 6935 */ 6936 public boolean isActionableForAccessibility() { 6937 return (isClickable() || isLongClickable() || isFocusable()); 6938 } 6939 6940 /** 6941 * Returns whether the View has registered callbacks wich makes it 6942 * important for accessibility. 6943 * 6944 * @return True if the view is actionable for accessibility. 6945 */ 6946 private boolean hasListenersForAccessibility() { 6947 ListenerInfo info = getListenerInfo(); 6948 return mTouchDelegate != null || info.mOnKeyListener != null 6949 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6950 || info.mOnHoverListener != null || info.mOnDragListener != null; 6951 } 6952 6953 /** 6954 * Notifies accessibility services that some view's important for 6955 * accessibility state has changed. Note that such notifications 6956 * are made at most once every 6957 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6958 * to avoid unnecessary load to the system. Also once a view has 6959 * made a notifucation this method is a NOP until the notification has 6960 * been sent to clients. 6961 * 6962 * @hide 6963 * 6964 * TODO: Makse sure this method is called for any view state change 6965 * that is interesting for accessilility purposes. 6966 */ 6967 public void notifyAccessibilityStateChanged() { 6968 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6969 return; 6970 } 6971 if ((mPrivateFlags2 & PFLAG2_ACCESSIBILITY_STATE_CHANGED) == 0) { 6972 mPrivateFlags2 |= PFLAG2_ACCESSIBILITY_STATE_CHANGED; 6973 if (mParent != null) { 6974 mParent.childAccessibilityStateChanged(this); 6975 } 6976 } 6977 } 6978 6979 /** 6980 * Reset the state indicating the this view has requested clients 6981 * interested in its accessibility state to be notified. 6982 * 6983 * @hide 6984 */ 6985 public void resetAccessibilityStateChanged() { 6986 mPrivateFlags2 &= ~PFLAG2_ACCESSIBILITY_STATE_CHANGED; 6987 } 6988 6989 /** 6990 * Performs the specified accessibility action on the view. For 6991 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6992 * <p> 6993 * If an {@link AccessibilityDelegate} has been specified via calling 6994 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6995 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6996 * is responsible for handling this call. 6997 * </p> 6998 * 6999 * @param action The action to perform. 7000 * @param arguments Optional action arguments. 7001 * @return Whether the action was performed. 7002 */ 7003 public boolean performAccessibilityAction(int action, Bundle arguments) { 7004 if (mAccessibilityDelegate != null) { 7005 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 7006 } else { 7007 return performAccessibilityActionInternal(action, arguments); 7008 } 7009 } 7010 7011 /** 7012 * @see #performAccessibilityAction(int, Bundle) 7013 * 7014 * Note: Called from the default {@link AccessibilityDelegate}. 7015 */ 7016 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 7017 switch (action) { 7018 case AccessibilityNodeInfo.ACTION_CLICK: { 7019 if (isClickable()) { 7020 performClick(); 7021 return true; 7022 } 7023 } break; 7024 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 7025 if (isLongClickable()) { 7026 performLongClick(); 7027 return true; 7028 } 7029 } break; 7030 case AccessibilityNodeInfo.ACTION_FOCUS: { 7031 if (!hasFocus()) { 7032 // Get out of touch mode since accessibility 7033 // wants to move focus around. 7034 getViewRootImpl().ensureTouchMode(false); 7035 return requestFocus(); 7036 } 7037 } break; 7038 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 7039 if (hasFocus()) { 7040 clearFocus(); 7041 return !isFocused(); 7042 } 7043 } break; 7044 case AccessibilityNodeInfo.ACTION_SELECT: { 7045 if (!isSelected()) { 7046 setSelected(true); 7047 return isSelected(); 7048 } 7049 } break; 7050 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 7051 if (isSelected()) { 7052 setSelected(false); 7053 return !isSelected(); 7054 } 7055 } break; 7056 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 7057 if (!isAccessibilityFocused()) { 7058 return requestAccessibilityFocus(); 7059 } 7060 } break; 7061 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 7062 if (isAccessibilityFocused()) { 7063 clearAccessibilityFocus(); 7064 return true; 7065 } 7066 } break; 7067 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 7068 if (arguments != null) { 7069 final int granularity = arguments.getInt( 7070 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7071 final boolean extendSelection = arguments.getBoolean( 7072 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7073 return nextAtGranularity(granularity, extendSelection); 7074 } 7075 } break; 7076 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 7077 if (arguments != null) { 7078 final int granularity = arguments.getInt( 7079 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 7080 final boolean extendSelection = arguments.getBoolean( 7081 AccessibilityNodeInfo.ACTION_ARGUMENT_EXTEND_SELECTION_BOOLEAN); 7082 return previousAtGranularity(granularity, extendSelection); 7083 } 7084 } break; 7085 case AccessibilityNodeInfo.ACTION_SET_SELECTION: { 7086 CharSequence text = getIterableTextForAccessibility(); 7087 if (text == null) { 7088 return false; 7089 } 7090 final int start = (arguments != null) ? arguments.getInt( 7091 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_START_INT, -1) : -1; 7092 final int end = (arguments != null) ? arguments.getInt( 7093 AccessibilityNodeInfo.ACTION_ARGUMENT_SELECTION_END_INT, -1) : -1; 7094 // Only cursor position can be specified (selection length == 0) 7095 if ((getAccessibilitySelectionStart() != start 7096 || getAccessibilitySelectionEnd() != end) 7097 && (start == end)) { 7098 setAccessibilitySelection(start, end); 7099 notifyAccessibilityStateChanged(); 7100 return true; 7101 } 7102 } break; 7103 } 7104 return false; 7105 } 7106 7107 private boolean nextAtGranularity(int granularity, boolean extendSelection) { 7108 CharSequence text = getIterableTextForAccessibility(); 7109 if (text == null || text.length() == 0) { 7110 return false; 7111 } 7112 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7113 if (iterator == null) { 7114 return false; 7115 } 7116 int current = getAccessibilitySelectionEnd(); 7117 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7118 current = 0; 7119 } 7120 final int[] range = iterator.following(current); 7121 if (range == null) { 7122 return false; 7123 } 7124 final int start = range[0]; 7125 final int end = range[1]; 7126 if (extendSelection && isAccessibilitySelectionExtendable()) { 7127 int selectionStart = getAccessibilitySelectionStart(); 7128 if (selectionStart == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7129 selectionStart = start; 7130 } 7131 setAccessibilitySelection(selectionStart, end); 7132 } else { 7133 setAccessibilitySelection(end, end); 7134 } 7135 sendViewTextTraversedAtGranularityEvent( 7136 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 7137 granularity, start, end); 7138 return true; 7139 } 7140 7141 private boolean previousAtGranularity(int granularity, boolean extendSelection) { 7142 CharSequence text = getIterableTextForAccessibility(); 7143 if (text == null || text.length() == 0) { 7144 return false; 7145 } 7146 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 7147 if (iterator == null) { 7148 return false; 7149 } 7150 int current = getAccessibilitySelectionStart(); 7151 if (current == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7152 current = text.length(); 7153 } 7154 final int[] range = iterator.preceding(current); 7155 if (range == null) { 7156 return false; 7157 } 7158 final int start = range[0]; 7159 final int end = range[1]; 7160 if (extendSelection && isAccessibilitySelectionExtendable()) { 7161 int selectionEnd = getAccessibilitySelectionEnd(); 7162 if (selectionEnd == ACCESSIBILITY_CURSOR_POSITION_UNDEFINED) { 7163 selectionEnd = end; 7164 } 7165 setAccessibilitySelection(start, selectionEnd); 7166 } else { 7167 setAccessibilitySelection(start, start); 7168 } 7169 sendViewTextTraversedAtGranularityEvent( 7170 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 7171 granularity, start, end); 7172 return true; 7173 } 7174 7175 /** 7176 * Gets the text reported for accessibility purposes. 7177 * 7178 * @return The accessibility text. 7179 * 7180 * @hide 7181 */ 7182 public CharSequence getIterableTextForAccessibility() { 7183 return getContentDescription(); 7184 } 7185 7186 /** 7187 * Gets whether accessibility selection can be extended. 7188 * 7189 * @return If selection is extensible. 7190 * 7191 * @hide 7192 */ 7193 public boolean isAccessibilitySelectionExtendable() { 7194 return false; 7195 } 7196 7197 /** 7198 * @hide 7199 */ 7200 public int getAccessibilitySelectionStart() { 7201 return mAccessibilityCursorPosition; 7202 } 7203 7204 /** 7205 * @hide 7206 */ 7207 public int getAccessibilitySelectionEnd() { 7208 return getAccessibilitySelectionStart(); 7209 } 7210 7211 /** 7212 * @hide 7213 */ 7214 public void setAccessibilitySelection(int start, int end) { 7215 if (start == end && end == mAccessibilityCursorPosition) { 7216 return; 7217 } 7218 if (start >= 0 && start == end && end <= getIterableTextForAccessibility().length()) { 7219 mAccessibilityCursorPosition = start; 7220 } else { 7221 mAccessibilityCursorPosition = ACCESSIBILITY_CURSOR_POSITION_UNDEFINED; 7222 } 7223 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED); 7224 } 7225 7226 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 7227 int fromIndex, int toIndex) { 7228 if (mParent == null) { 7229 return; 7230 } 7231 AccessibilityEvent event = AccessibilityEvent.obtain( 7232 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 7233 onInitializeAccessibilityEvent(event); 7234 onPopulateAccessibilityEvent(event); 7235 event.setFromIndex(fromIndex); 7236 event.setToIndex(toIndex); 7237 event.setAction(action); 7238 event.setMovementGranularity(granularity); 7239 mParent.requestSendAccessibilityEvent(this, event); 7240 } 7241 7242 /** 7243 * @hide 7244 */ 7245 public TextSegmentIterator getIteratorForGranularity(int granularity) { 7246 switch (granularity) { 7247 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 7248 CharSequence text = getIterableTextForAccessibility(); 7249 if (text != null && text.length() > 0) { 7250 CharacterTextSegmentIterator iterator = 7251 CharacterTextSegmentIterator.getInstance( 7252 mContext.getResources().getConfiguration().locale); 7253 iterator.initialize(text.toString()); 7254 return iterator; 7255 } 7256 } break; 7257 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 7258 CharSequence text = getIterableTextForAccessibility(); 7259 if (text != null && text.length() > 0) { 7260 WordTextSegmentIterator iterator = 7261 WordTextSegmentIterator.getInstance( 7262 mContext.getResources().getConfiguration().locale); 7263 iterator.initialize(text.toString()); 7264 return iterator; 7265 } 7266 } break; 7267 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 7268 CharSequence text = getIterableTextForAccessibility(); 7269 if (text != null && text.length() > 0) { 7270 ParagraphTextSegmentIterator iterator = 7271 ParagraphTextSegmentIterator.getInstance(); 7272 iterator.initialize(text.toString()); 7273 return iterator; 7274 } 7275 } break; 7276 } 7277 return null; 7278 } 7279 7280 /** 7281 * @hide 7282 */ 7283 public void dispatchStartTemporaryDetach() { 7284 clearAccessibilityFocus(); 7285 clearDisplayList(); 7286 7287 onStartTemporaryDetach(); 7288 } 7289 7290 /** 7291 * This is called when a container is going to temporarily detach a child, with 7292 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 7293 * It will either be followed by {@link #onFinishTemporaryDetach()} or 7294 * {@link #onDetachedFromWindow()} when the container is done. 7295 */ 7296 public void onStartTemporaryDetach() { 7297 removeUnsetPressCallback(); 7298 mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT; 7299 } 7300 7301 /** 7302 * @hide 7303 */ 7304 public void dispatchFinishTemporaryDetach() { 7305 onFinishTemporaryDetach(); 7306 } 7307 7308 /** 7309 * Called after {@link #onStartTemporaryDetach} when the container is done 7310 * changing the view. 7311 */ 7312 public void onFinishTemporaryDetach() { 7313 } 7314 7315 /** 7316 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 7317 * for this view's window. Returns null if the view is not currently attached 7318 * to the window. Normally you will not need to use this directly, but 7319 * just use the standard high-level event callbacks like 7320 * {@link #onKeyDown(int, KeyEvent)}. 7321 */ 7322 public KeyEvent.DispatcherState getKeyDispatcherState() { 7323 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 7324 } 7325 7326 /** 7327 * Dispatch a key event before it is processed by any input method 7328 * associated with the view hierarchy. This can be used to intercept 7329 * key events in special situations before the IME consumes them; a 7330 * typical example would be handling the BACK key to update the application's 7331 * UI instead of allowing the IME to see it and close itself. 7332 * 7333 * @param event The key event to be dispatched. 7334 * @return True if the event was handled, false otherwise. 7335 */ 7336 public boolean dispatchKeyEventPreIme(KeyEvent event) { 7337 return onKeyPreIme(event.getKeyCode(), event); 7338 } 7339 7340 /** 7341 * Dispatch a key event to the next view on the focus path. This path runs 7342 * from the top of the view tree down to the currently focused view. If this 7343 * view has focus, it will dispatch to itself. Otherwise it will dispatch 7344 * the next node down the focus path. This method also fires any key 7345 * listeners. 7346 * 7347 * @param event The key event to be dispatched. 7348 * @return True if the event was handled, false otherwise. 7349 */ 7350 public boolean dispatchKeyEvent(KeyEvent event) { 7351 if (mInputEventConsistencyVerifier != null) { 7352 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 7353 } 7354 7355 // Give any attached key listener a first crack at the event. 7356 //noinspection SimplifiableIfStatement 7357 ListenerInfo li = mListenerInfo; 7358 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7359 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 7360 return true; 7361 } 7362 7363 if (event.dispatch(this, mAttachInfo != null 7364 ? mAttachInfo.mKeyDispatchState : null, this)) { 7365 return true; 7366 } 7367 7368 if (mInputEventConsistencyVerifier != null) { 7369 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7370 } 7371 return false; 7372 } 7373 7374 /** 7375 * Dispatches a key shortcut event. 7376 * 7377 * @param event The key event to be dispatched. 7378 * @return True if the event was handled by the view, false otherwise. 7379 */ 7380 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 7381 return onKeyShortcut(event.getKeyCode(), event); 7382 } 7383 7384 /** 7385 * Pass the touch screen motion event down to the target view, or this 7386 * view if it is the target. 7387 * 7388 * @param event The motion event to be dispatched. 7389 * @return True if the event was handled by the view, false otherwise. 7390 */ 7391 public boolean dispatchTouchEvent(MotionEvent event) { 7392 if (mInputEventConsistencyVerifier != null) { 7393 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 7394 } 7395 7396 if (onFilterTouchEventForSecurity(event)) { 7397 //noinspection SimplifiableIfStatement 7398 ListenerInfo li = mListenerInfo; 7399 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 7400 && li.mOnTouchListener.onTouch(this, event)) { 7401 return true; 7402 } 7403 7404 if (onTouchEvent(event)) { 7405 return true; 7406 } 7407 } 7408 7409 if (mInputEventConsistencyVerifier != null) { 7410 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7411 } 7412 return false; 7413 } 7414 7415 /** 7416 * Filter the touch event to apply security policies. 7417 * 7418 * @param event The motion event to be filtered. 7419 * @return True if the event should be dispatched, false if the event should be dropped. 7420 * 7421 * @see #getFilterTouchesWhenObscured 7422 */ 7423 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 7424 //noinspection RedundantIfStatement 7425 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 7426 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 7427 // Window is obscured, drop this touch. 7428 return false; 7429 } 7430 return true; 7431 } 7432 7433 /** 7434 * Pass a trackball motion event down to the focused view. 7435 * 7436 * @param event The motion event to be dispatched. 7437 * @return True if the event was handled by the view, false otherwise. 7438 */ 7439 public boolean dispatchTrackballEvent(MotionEvent event) { 7440 if (mInputEventConsistencyVerifier != null) { 7441 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 7442 } 7443 7444 return onTrackballEvent(event); 7445 } 7446 7447 /** 7448 * Dispatch a generic motion event. 7449 * <p> 7450 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7451 * are delivered to the view under the pointer. All other generic motion events are 7452 * delivered to the focused view. Hover events are handled specially and are delivered 7453 * to {@link #onHoverEvent(MotionEvent)}. 7454 * </p> 7455 * 7456 * @param event The motion event to be dispatched. 7457 * @return True if the event was handled by the view, false otherwise. 7458 */ 7459 public boolean dispatchGenericMotionEvent(MotionEvent event) { 7460 if (mInputEventConsistencyVerifier != null) { 7461 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 7462 } 7463 7464 final int source = event.getSource(); 7465 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7466 final int action = event.getAction(); 7467 if (action == MotionEvent.ACTION_HOVER_ENTER 7468 || action == MotionEvent.ACTION_HOVER_MOVE 7469 || action == MotionEvent.ACTION_HOVER_EXIT) { 7470 if (dispatchHoverEvent(event)) { 7471 return true; 7472 } 7473 } else if (dispatchGenericPointerEvent(event)) { 7474 return true; 7475 } 7476 } else if (dispatchGenericFocusedEvent(event)) { 7477 return true; 7478 } 7479 7480 if (dispatchGenericMotionEventInternal(event)) { 7481 return true; 7482 } 7483 7484 if (mInputEventConsistencyVerifier != null) { 7485 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7486 } 7487 return false; 7488 } 7489 7490 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7491 //noinspection SimplifiableIfStatement 7492 ListenerInfo li = mListenerInfo; 7493 if (li != null && li.mOnGenericMotionListener != null 7494 && (mViewFlags & ENABLED_MASK) == ENABLED 7495 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7496 return true; 7497 } 7498 7499 if (onGenericMotionEvent(event)) { 7500 return true; 7501 } 7502 7503 if (mInputEventConsistencyVerifier != null) { 7504 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7505 } 7506 return false; 7507 } 7508 7509 /** 7510 * Dispatch a hover event. 7511 * <p> 7512 * Do not call this method directly. 7513 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7514 * </p> 7515 * 7516 * @param event The motion event to be dispatched. 7517 * @return True if the event was handled by the view, false otherwise. 7518 */ 7519 protected boolean dispatchHoverEvent(MotionEvent event) { 7520 //noinspection SimplifiableIfStatement 7521 ListenerInfo li = mListenerInfo; 7522 if (li != null && li.mOnHoverListener != null 7523 && (mViewFlags & ENABLED_MASK) == ENABLED 7524 && li.mOnHoverListener.onHover(this, event)) { 7525 return true; 7526 } 7527 7528 return onHoverEvent(event); 7529 } 7530 7531 /** 7532 * Returns true if the view has a child to which it has recently sent 7533 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7534 * it does not have a hovered child, then it must be the innermost hovered view. 7535 * @hide 7536 */ 7537 protected boolean hasHoveredChild() { 7538 return false; 7539 } 7540 7541 /** 7542 * Dispatch a generic motion event to the view under the first pointer. 7543 * <p> 7544 * Do not call this method directly. 7545 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7546 * </p> 7547 * 7548 * @param event The motion event to be dispatched. 7549 * @return True if the event was handled by the view, false otherwise. 7550 */ 7551 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7552 return false; 7553 } 7554 7555 /** 7556 * Dispatch a generic motion event to the currently focused view. 7557 * <p> 7558 * Do not call this method directly. 7559 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7560 * </p> 7561 * 7562 * @param event The motion event to be dispatched. 7563 * @return True if the event was handled by the view, false otherwise. 7564 */ 7565 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7566 return false; 7567 } 7568 7569 /** 7570 * Dispatch a pointer event. 7571 * <p> 7572 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7573 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7574 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7575 * and should not be expected to handle other pointing device features. 7576 * </p> 7577 * 7578 * @param event The motion event to be dispatched. 7579 * @return True if the event was handled by the view, false otherwise. 7580 * @hide 7581 */ 7582 public final boolean dispatchPointerEvent(MotionEvent event) { 7583 if (event.isTouchEvent()) { 7584 return dispatchTouchEvent(event); 7585 } else { 7586 return dispatchGenericMotionEvent(event); 7587 } 7588 } 7589 7590 /** 7591 * Called when the window containing this view gains or loses window focus. 7592 * ViewGroups should override to route to their children. 7593 * 7594 * @param hasFocus True if the window containing this view now has focus, 7595 * false otherwise. 7596 */ 7597 public void dispatchWindowFocusChanged(boolean hasFocus) { 7598 onWindowFocusChanged(hasFocus); 7599 } 7600 7601 /** 7602 * Called when the window containing this view gains or loses focus. Note 7603 * that this is separate from view focus: to receive key events, both 7604 * your view and its window must have focus. If a window is displayed 7605 * on top of yours that takes input focus, then your own window will lose 7606 * focus but the view focus will remain unchanged. 7607 * 7608 * @param hasWindowFocus True if the window containing this view now has 7609 * focus, false otherwise. 7610 */ 7611 public void onWindowFocusChanged(boolean hasWindowFocus) { 7612 InputMethodManager imm = InputMethodManager.peekInstance(); 7613 if (!hasWindowFocus) { 7614 if (isPressed()) { 7615 setPressed(false); 7616 } 7617 if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7618 imm.focusOut(this); 7619 } 7620 removeLongPressCallback(); 7621 removeTapCallback(); 7622 onFocusLost(); 7623 } else if (imm != null && (mPrivateFlags & PFLAG_FOCUSED) != 0) { 7624 imm.focusIn(this); 7625 } 7626 refreshDrawableState(); 7627 } 7628 7629 /** 7630 * Returns true if this view is in a window that currently has window focus. 7631 * Note that this is not the same as the view itself having focus. 7632 * 7633 * @return True if this view is in a window that currently has window focus. 7634 */ 7635 public boolean hasWindowFocus() { 7636 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7637 } 7638 7639 /** 7640 * Dispatch a view visibility change down the view hierarchy. 7641 * ViewGroups should override to route to their children. 7642 * @param changedView The view whose visibility changed. Could be 'this' or 7643 * an ancestor view. 7644 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7645 * {@link #INVISIBLE} or {@link #GONE}. 7646 */ 7647 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7648 onVisibilityChanged(changedView, visibility); 7649 } 7650 7651 /** 7652 * Called when the visibility of the view or an ancestor of the view is changed. 7653 * @param changedView The view whose visibility changed. Could be 'this' or 7654 * an ancestor view. 7655 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7656 * {@link #INVISIBLE} or {@link #GONE}. 7657 */ 7658 protected void onVisibilityChanged(View changedView, int visibility) { 7659 if (visibility == VISIBLE) { 7660 if (mAttachInfo != null) { 7661 initialAwakenScrollBars(); 7662 } else { 7663 mPrivateFlags |= PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 7664 } 7665 } 7666 } 7667 7668 /** 7669 * Dispatch a hint about whether this view is displayed. For instance, when 7670 * a View moves out of the screen, it might receives a display hint indicating 7671 * the view is not displayed. Applications should not <em>rely</em> on this hint 7672 * as there is no guarantee that they will receive one. 7673 * 7674 * @param hint A hint about whether or not this view is displayed: 7675 * {@link #VISIBLE} or {@link #INVISIBLE}. 7676 */ 7677 public void dispatchDisplayHint(int hint) { 7678 onDisplayHint(hint); 7679 } 7680 7681 /** 7682 * Gives this view a hint about whether is displayed or not. For instance, when 7683 * a View moves out of the screen, it might receives a display hint indicating 7684 * the view is not displayed. Applications should not <em>rely</em> on this hint 7685 * as there is no guarantee that they will receive one. 7686 * 7687 * @param hint A hint about whether or not this view is displayed: 7688 * {@link #VISIBLE} or {@link #INVISIBLE}. 7689 */ 7690 protected void onDisplayHint(int hint) { 7691 } 7692 7693 /** 7694 * Dispatch a window visibility change down the view hierarchy. 7695 * ViewGroups should override to route to their children. 7696 * 7697 * @param visibility The new visibility of the window. 7698 * 7699 * @see #onWindowVisibilityChanged(int) 7700 */ 7701 public void dispatchWindowVisibilityChanged(int visibility) { 7702 onWindowVisibilityChanged(visibility); 7703 } 7704 7705 /** 7706 * Called when the window containing has change its visibility 7707 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7708 * that this tells you whether or not your window is being made visible 7709 * to the window manager; this does <em>not</em> tell you whether or not 7710 * your window is obscured by other windows on the screen, even if it 7711 * is itself visible. 7712 * 7713 * @param visibility The new visibility of the window. 7714 */ 7715 protected void onWindowVisibilityChanged(int visibility) { 7716 if (visibility == VISIBLE) { 7717 initialAwakenScrollBars(); 7718 } 7719 } 7720 7721 /** 7722 * Returns the current visibility of the window this view is attached to 7723 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7724 * 7725 * @return Returns the current visibility of the view's window. 7726 */ 7727 public int getWindowVisibility() { 7728 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7729 } 7730 7731 /** 7732 * Retrieve the overall visible display size in which the window this view is 7733 * attached to has been positioned in. This takes into account screen 7734 * decorations above the window, for both cases where the window itself 7735 * is being position inside of them or the window is being placed under 7736 * then and covered insets are used for the window to position its content 7737 * inside. In effect, this tells you the available area where content can 7738 * be placed and remain visible to users. 7739 * 7740 * <p>This function requires an IPC back to the window manager to retrieve 7741 * the requested information, so should not be used in performance critical 7742 * code like drawing. 7743 * 7744 * @param outRect Filled in with the visible display frame. If the view 7745 * is not attached to a window, this is simply the raw display size. 7746 */ 7747 public void getWindowVisibleDisplayFrame(Rect outRect) { 7748 if (mAttachInfo != null) { 7749 try { 7750 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7751 } catch (RemoteException e) { 7752 return; 7753 } 7754 // XXX This is really broken, and probably all needs to be done 7755 // in the window manager, and we need to know more about whether 7756 // we want the area behind or in front of the IME. 7757 final Rect insets = mAttachInfo.mVisibleInsets; 7758 outRect.left += insets.left; 7759 outRect.top += insets.top; 7760 outRect.right -= insets.right; 7761 outRect.bottom -= insets.bottom; 7762 return; 7763 } 7764 // The view is not attached to a display so we don't have a context. 7765 // Make a best guess about the display size. 7766 Display d = DisplayManagerGlobal.getInstance().getRealDisplay(Display.DEFAULT_DISPLAY); 7767 d.getRectSize(outRect); 7768 } 7769 7770 /** 7771 * Dispatch a notification about a resource configuration change down 7772 * the view hierarchy. 7773 * ViewGroups should override to route to their children. 7774 * 7775 * @param newConfig The new resource configuration. 7776 * 7777 * @see #onConfigurationChanged(android.content.res.Configuration) 7778 */ 7779 public void dispatchConfigurationChanged(Configuration newConfig) { 7780 onConfigurationChanged(newConfig); 7781 } 7782 7783 /** 7784 * Called when the current configuration of the resources being used 7785 * by the application have changed. You can use this to decide when 7786 * to reload resources that can changed based on orientation and other 7787 * configuration characterstics. You only need to use this if you are 7788 * not relying on the normal {@link android.app.Activity} mechanism of 7789 * recreating the activity instance upon a configuration change. 7790 * 7791 * @param newConfig The new resource configuration. 7792 */ 7793 protected void onConfigurationChanged(Configuration newConfig) { 7794 } 7795 7796 /** 7797 * Private function to aggregate all per-view attributes in to the view 7798 * root. 7799 */ 7800 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7801 performCollectViewAttributes(attachInfo, visibility); 7802 } 7803 7804 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7805 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7806 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7807 attachInfo.mKeepScreenOn = true; 7808 } 7809 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7810 ListenerInfo li = mListenerInfo; 7811 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7812 attachInfo.mHasSystemUiListeners = true; 7813 } 7814 } 7815 } 7816 7817 void needGlobalAttributesUpdate(boolean force) { 7818 final AttachInfo ai = mAttachInfo; 7819 if (ai != null && !ai.mRecomputeGlobalAttributes) { 7820 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7821 || ai.mHasSystemUiListeners) { 7822 ai.mRecomputeGlobalAttributes = true; 7823 } 7824 } 7825 } 7826 7827 /** 7828 * Returns whether the device is currently in touch mode. Touch mode is entered 7829 * once the user begins interacting with the device by touch, and affects various 7830 * things like whether focus is always visible to the user. 7831 * 7832 * @return Whether the device is in touch mode. 7833 */ 7834 @ViewDebug.ExportedProperty 7835 public boolean isInTouchMode() { 7836 if (mAttachInfo != null) { 7837 return mAttachInfo.mInTouchMode; 7838 } else { 7839 return ViewRootImpl.isInTouchMode(); 7840 } 7841 } 7842 7843 /** 7844 * Returns the context the view is running in, through which it can 7845 * access the current theme, resources, etc. 7846 * 7847 * @return The view's Context. 7848 */ 7849 @ViewDebug.CapturedViewProperty 7850 public final Context getContext() { 7851 return mContext; 7852 } 7853 7854 /** 7855 * Handle a key event before it is processed by any input method 7856 * associated with the view hierarchy. This can be used to intercept 7857 * key events in special situations before the IME consumes them; a 7858 * typical example would be handling the BACK key to update the application's 7859 * UI instead of allowing the IME to see it and close itself. 7860 * 7861 * @param keyCode The value in event.getKeyCode(). 7862 * @param event Description of the key event. 7863 * @return If you handled the event, return true. If you want to allow the 7864 * event to be handled by the next receiver, return false. 7865 */ 7866 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7867 return false; 7868 } 7869 7870 /** 7871 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7872 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7873 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7874 * is released, if the view is enabled and clickable. 7875 * 7876 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7877 * although some may elect to do so in some situations. Do not rely on this to 7878 * catch software key presses. 7879 * 7880 * @param keyCode A key code that represents the button pressed, from 7881 * {@link android.view.KeyEvent}. 7882 * @param event The KeyEvent object that defines the button action. 7883 */ 7884 public boolean onKeyDown(int keyCode, KeyEvent event) { 7885 boolean result = false; 7886 7887 switch (keyCode) { 7888 case KeyEvent.KEYCODE_DPAD_CENTER: 7889 case KeyEvent.KEYCODE_ENTER: { 7890 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7891 return true; 7892 } 7893 // Long clickable items don't necessarily have to be clickable 7894 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7895 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7896 (event.getRepeatCount() == 0)) { 7897 setPressed(true); 7898 checkForLongClick(0); 7899 return true; 7900 } 7901 break; 7902 } 7903 } 7904 return result; 7905 } 7906 7907 /** 7908 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7909 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7910 * the event). 7911 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7912 * although some may elect to do so in some situations. Do not rely on this to 7913 * catch software key presses. 7914 */ 7915 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7916 return false; 7917 } 7918 7919 /** 7920 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7921 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7922 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7923 * {@link KeyEvent#KEYCODE_ENTER} is released. 7924 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7925 * although some may elect to do so in some situations. Do not rely on this to 7926 * catch software key presses. 7927 * 7928 * @param keyCode A key code that represents the button pressed, from 7929 * {@link android.view.KeyEvent}. 7930 * @param event The KeyEvent object that defines the button action. 7931 */ 7932 public boolean onKeyUp(int keyCode, KeyEvent event) { 7933 boolean result = false; 7934 7935 switch (keyCode) { 7936 case KeyEvent.KEYCODE_DPAD_CENTER: 7937 case KeyEvent.KEYCODE_ENTER: { 7938 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7939 return true; 7940 } 7941 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7942 setPressed(false); 7943 7944 if (!mHasPerformedLongPress) { 7945 // This is a tap, so remove the longpress check 7946 removeLongPressCallback(); 7947 7948 result = performClick(); 7949 } 7950 } 7951 break; 7952 } 7953 } 7954 return result; 7955 } 7956 7957 /** 7958 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7959 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7960 * the event). 7961 * <p>Key presses in software keyboards will generally NOT trigger this listener, 7962 * although some may elect to do so in some situations. Do not rely on this to 7963 * catch software key presses. 7964 * 7965 * @param keyCode A key code that represents the button pressed, from 7966 * {@link android.view.KeyEvent}. 7967 * @param repeatCount The number of times the action was made. 7968 * @param event The KeyEvent object that defines the button action. 7969 */ 7970 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7971 return false; 7972 } 7973 7974 /** 7975 * Called on the focused view when a key shortcut event is not handled. 7976 * Override this method to implement local key shortcuts for the View. 7977 * Key shortcuts can also be implemented by setting the 7978 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7979 * 7980 * @param keyCode The value in event.getKeyCode(). 7981 * @param event Description of the key event. 7982 * @return If you handled the event, return true. If you want to allow the 7983 * event to be handled by the next receiver, return false. 7984 */ 7985 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7986 return false; 7987 } 7988 7989 /** 7990 * Check whether the called view is a text editor, in which case it 7991 * would make sense to automatically display a soft input window for 7992 * it. Subclasses should override this if they implement 7993 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7994 * a call on that method would return a non-null InputConnection, and 7995 * they are really a first-class editor that the user would normally 7996 * start typing on when the go into a window containing your view. 7997 * 7998 * <p>The default implementation always returns false. This does 7999 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 8000 * will not be called or the user can not otherwise perform edits on your 8001 * view; it is just a hint to the system that this is not the primary 8002 * purpose of this view. 8003 * 8004 * @return Returns true if this view is a text editor, else false. 8005 */ 8006 public boolean onCheckIsTextEditor() { 8007 return false; 8008 } 8009 8010 /** 8011 * Create a new InputConnection for an InputMethod to interact 8012 * with the view. The default implementation returns null, since it doesn't 8013 * support input methods. You can override this to implement such support. 8014 * This is only needed for views that take focus and text input. 8015 * 8016 * <p>When implementing this, you probably also want to implement 8017 * {@link #onCheckIsTextEditor()} to indicate you will return a 8018 * non-null InputConnection. 8019 * 8020 * @param outAttrs Fill in with attribute information about the connection. 8021 */ 8022 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 8023 return null; 8024 } 8025 8026 /** 8027 * Called by the {@link android.view.inputmethod.InputMethodManager} 8028 * when a view who is not the current 8029 * input connection target is trying to make a call on the manager. The 8030 * default implementation returns false; you can override this to return 8031 * true for certain views if you are performing InputConnection proxying 8032 * to them. 8033 * @param view The View that is making the InputMethodManager call. 8034 * @return Return true to allow the call, false to reject. 8035 */ 8036 public boolean checkInputConnectionProxy(View view) { 8037 return false; 8038 } 8039 8040 /** 8041 * Show the context menu for this view. It is not safe to hold on to the 8042 * menu after returning from this method. 8043 * 8044 * You should normally not overload this method. Overload 8045 * {@link #onCreateContextMenu(ContextMenu)} or define an 8046 * {@link OnCreateContextMenuListener} to add items to the context menu. 8047 * 8048 * @param menu The context menu to populate 8049 */ 8050 public void createContextMenu(ContextMenu menu) { 8051 ContextMenuInfo menuInfo = getContextMenuInfo(); 8052 8053 // Sets the current menu info so all items added to menu will have 8054 // my extra info set. 8055 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 8056 8057 onCreateContextMenu(menu); 8058 ListenerInfo li = mListenerInfo; 8059 if (li != null && li.mOnCreateContextMenuListener != null) { 8060 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 8061 } 8062 8063 // Clear the extra information so subsequent items that aren't mine don't 8064 // have my extra info. 8065 ((MenuBuilder)menu).setCurrentMenuInfo(null); 8066 8067 if (mParent != null) { 8068 mParent.createContextMenu(menu); 8069 } 8070 } 8071 8072 /** 8073 * Views should implement this if they have extra information to associate 8074 * with the context menu. The return result is supplied as a parameter to 8075 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 8076 * callback. 8077 * 8078 * @return Extra information about the item for which the context menu 8079 * should be shown. This information will vary across different 8080 * subclasses of View. 8081 */ 8082 protected ContextMenuInfo getContextMenuInfo() { 8083 return null; 8084 } 8085 8086 /** 8087 * Views should implement this if the view itself is going to add items to 8088 * the context menu. 8089 * 8090 * @param menu the context menu to populate 8091 */ 8092 protected void onCreateContextMenu(ContextMenu menu) { 8093 } 8094 8095 /** 8096 * Implement this method to handle trackball motion events. The 8097 * <em>relative</em> movement of the trackball since the last event 8098 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 8099 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 8100 * that a movement of 1 corresponds to the user pressing one DPAD key (so 8101 * they will often be fractional values, representing the more fine-grained 8102 * movement information available from a trackball). 8103 * 8104 * @param event The motion event. 8105 * @return True if the event was handled, false otherwise. 8106 */ 8107 public boolean onTrackballEvent(MotionEvent event) { 8108 return false; 8109 } 8110 8111 /** 8112 * Implement this method to handle generic motion events. 8113 * <p> 8114 * Generic motion events describe joystick movements, mouse hovers, track pad 8115 * touches, scroll wheel movements and other input events. The 8116 * {@link MotionEvent#getSource() source} of the motion event specifies 8117 * the class of input that was received. Implementations of this method 8118 * must examine the bits in the source before processing the event. 8119 * The following code example shows how this is done. 8120 * </p><p> 8121 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 8122 * are delivered to the view under the pointer. All other generic motion events are 8123 * delivered to the focused view. 8124 * </p> 8125 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 8126 * if (event.isFromSource(InputDevice.SOURCE_CLASS_JOYSTICK)) { 8127 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 8128 * // process the joystick movement... 8129 * return true; 8130 * } 8131 * } 8132 * if (event.isFromSource(InputDevice.SOURCE_CLASS_POINTER)) { 8133 * switch (event.getAction()) { 8134 * case MotionEvent.ACTION_HOVER_MOVE: 8135 * // process the mouse hover movement... 8136 * return true; 8137 * case MotionEvent.ACTION_SCROLL: 8138 * // process the scroll wheel movement... 8139 * return true; 8140 * } 8141 * } 8142 * return super.onGenericMotionEvent(event); 8143 * }</pre> 8144 * 8145 * @param event The generic motion event being processed. 8146 * @return True if the event was handled, false otherwise. 8147 */ 8148 public boolean onGenericMotionEvent(MotionEvent event) { 8149 return false; 8150 } 8151 8152 /** 8153 * Implement this method to handle hover events. 8154 * <p> 8155 * This method is called whenever a pointer is hovering into, over, or out of the 8156 * bounds of a view and the view is not currently being touched. 8157 * Hover events are represented as pointer events with action 8158 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 8159 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 8160 * </p> 8161 * <ul> 8162 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 8163 * when the pointer enters the bounds of the view.</li> 8164 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 8165 * when the pointer has already entered the bounds of the view and has moved.</li> 8166 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 8167 * when the pointer has exited the bounds of the view or when the pointer is 8168 * about to go down due to a button click, tap, or similar user action that 8169 * causes the view to be touched.</li> 8170 * </ul> 8171 * <p> 8172 * The view should implement this method to return true to indicate that it is 8173 * handling the hover event, such as by changing its drawable state. 8174 * </p><p> 8175 * The default implementation calls {@link #setHovered} to update the hovered state 8176 * of the view when a hover enter or hover exit event is received, if the view 8177 * is enabled and is clickable. The default implementation also sends hover 8178 * accessibility events. 8179 * </p> 8180 * 8181 * @param event The motion event that describes the hover. 8182 * @return True if the view handled the hover event. 8183 * 8184 * @see #isHovered 8185 * @see #setHovered 8186 * @see #onHoverChanged 8187 */ 8188 public boolean onHoverEvent(MotionEvent event) { 8189 // The root view may receive hover (or touch) events that are outside the bounds of 8190 // the window. This code ensures that we only send accessibility events for 8191 // hovers that are actually within the bounds of the root view. 8192 final int action = event.getActionMasked(); 8193 if (!mSendingHoverAccessibilityEvents) { 8194 if ((action == MotionEvent.ACTION_HOVER_ENTER 8195 || action == MotionEvent.ACTION_HOVER_MOVE) 8196 && !hasHoveredChild() 8197 && pointInView(event.getX(), event.getY())) { 8198 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 8199 mSendingHoverAccessibilityEvents = true; 8200 } 8201 } else { 8202 if (action == MotionEvent.ACTION_HOVER_EXIT 8203 || (action == MotionEvent.ACTION_MOVE 8204 && !pointInView(event.getX(), event.getY()))) { 8205 mSendingHoverAccessibilityEvents = false; 8206 sendAccessibilityHoverEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 8207 // If the window does not have input focus we take away accessibility 8208 // focus as soon as the user stop hovering over the view. 8209 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 8210 getViewRootImpl().setAccessibilityFocus(null, null); 8211 } 8212 } 8213 } 8214 8215 if (isHoverable()) { 8216 switch (action) { 8217 case MotionEvent.ACTION_HOVER_ENTER: 8218 setHovered(true); 8219 break; 8220 case MotionEvent.ACTION_HOVER_EXIT: 8221 setHovered(false); 8222 break; 8223 } 8224 8225 // Dispatch the event to onGenericMotionEvent before returning true. 8226 // This is to provide compatibility with existing applications that 8227 // handled HOVER_MOVE events in onGenericMotionEvent and that would 8228 // break because of the new default handling for hoverable views 8229 // in onHoverEvent. 8230 // Note that onGenericMotionEvent will be called by default when 8231 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 8232 return dispatchGenericMotionEventInternal(event); 8233 } 8234 8235 return false; 8236 } 8237 8238 /** 8239 * Returns true if the view should handle {@link #onHoverEvent} 8240 * by calling {@link #setHovered} to change its hovered state. 8241 * 8242 * @return True if the view is hoverable. 8243 */ 8244 private boolean isHoverable() { 8245 final int viewFlags = mViewFlags; 8246 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8247 return false; 8248 } 8249 8250 return (viewFlags & CLICKABLE) == CLICKABLE 8251 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 8252 } 8253 8254 /** 8255 * Returns true if the view is currently hovered. 8256 * 8257 * @return True if the view is currently hovered. 8258 * 8259 * @see #setHovered 8260 * @see #onHoverChanged 8261 */ 8262 @ViewDebug.ExportedProperty 8263 public boolean isHovered() { 8264 return (mPrivateFlags & PFLAG_HOVERED) != 0; 8265 } 8266 8267 /** 8268 * Sets whether the view is currently hovered. 8269 * <p> 8270 * Calling this method also changes the drawable state of the view. This 8271 * enables the view to react to hover by using different drawable resources 8272 * to change its appearance. 8273 * </p><p> 8274 * The {@link #onHoverChanged} method is called when the hovered state changes. 8275 * </p> 8276 * 8277 * @param hovered True if the view is hovered. 8278 * 8279 * @see #isHovered 8280 * @see #onHoverChanged 8281 */ 8282 public void setHovered(boolean hovered) { 8283 if (hovered) { 8284 if ((mPrivateFlags & PFLAG_HOVERED) == 0) { 8285 mPrivateFlags |= PFLAG_HOVERED; 8286 refreshDrawableState(); 8287 onHoverChanged(true); 8288 } 8289 } else { 8290 if ((mPrivateFlags & PFLAG_HOVERED) != 0) { 8291 mPrivateFlags &= ~PFLAG_HOVERED; 8292 refreshDrawableState(); 8293 onHoverChanged(false); 8294 } 8295 } 8296 } 8297 8298 /** 8299 * Implement this method to handle hover state changes. 8300 * <p> 8301 * This method is called whenever the hover state changes as a result of a 8302 * call to {@link #setHovered}. 8303 * </p> 8304 * 8305 * @param hovered The current hover state, as returned by {@link #isHovered}. 8306 * 8307 * @see #isHovered 8308 * @see #setHovered 8309 */ 8310 public void onHoverChanged(boolean hovered) { 8311 } 8312 8313 /** 8314 * Implement this method to handle touch screen motion events. 8315 * 8316 * @param event The motion event. 8317 * @return True if the event was handled, false otherwise. 8318 */ 8319 public boolean onTouchEvent(MotionEvent event) { 8320 final int viewFlags = mViewFlags; 8321 8322 if ((viewFlags & ENABLED_MASK) == DISABLED) { 8323 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PFLAG_PRESSED) != 0) { 8324 setPressed(false); 8325 } 8326 // A disabled view that is clickable still consumes the touch 8327 // events, it just doesn't respond to them. 8328 return (((viewFlags & CLICKABLE) == CLICKABLE || 8329 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 8330 } 8331 8332 if (mTouchDelegate != null) { 8333 if (mTouchDelegate.onTouchEvent(event)) { 8334 return true; 8335 } 8336 } 8337 8338 if (((viewFlags & CLICKABLE) == CLICKABLE || 8339 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 8340 switch (event.getAction()) { 8341 case MotionEvent.ACTION_UP: 8342 boolean prepressed = (mPrivateFlags & PFLAG_PREPRESSED) != 0; 8343 if ((mPrivateFlags & PFLAG_PRESSED) != 0 || prepressed) { 8344 // take focus if we don't have it already and we should in 8345 // touch mode. 8346 boolean focusTaken = false; 8347 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 8348 focusTaken = requestFocus(); 8349 } 8350 8351 if (prepressed) { 8352 // The button is being released before we actually 8353 // showed it as pressed. Make it show the pressed 8354 // state now (before scheduling the click) to ensure 8355 // the user sees it. 8356 setPressed(true); 8357 } 8358 8359 if (!mHasPerformedLongPress) { 8360 // This is a tap, so remove the longpress check 8361 removeLongPressCallback(); 8362 8363 // Only perform take click actions if we were in the pressed state 8364 if (!focusTaken) { 8365 // Use a Runnable and post this rather than calling 8366 // performClick directly. This lets other visual state 8367 // of the view update before click actions start. 8368 if (mPerformClick == null) { 8369 mPerformClick = new PerformClick(); 8370 } 8371 if (!post(mPerformClick)) { 8372 performClick(); 8373 } 8374 } 8375 } 8376 8377 if (mUnsetPressedState == null) { 8378 mUnsetPressedState = new UnsetPressedState(); 8379 } 8380 8381 if (prepressed) { 8382 postDelayed(mUnsetPressedState, 8383 ViewConfiguration.getPressedStateDuration()); 8384 } else if (!post(mUnsetPressedState)) { 8385 // If the post failed, unpress right now 8386 mUnsetPressedState.run(); 8387 } 8388 removeTapCallback(); 8389 } 8390 break; 8391 8392 case MotionEvent.ACTION_DOWN: 8393 mHasPerformedLongPress = false; 8394 8395 if (performButtonActionOnTouchDown(event)) { 8396 break; 8397 } 8398 8399 // Walk up the hierarchy to determine if we're inside a scrolling container. 8400 boolean isInScrollingContainer = isInScrollingContainer(); 8401 8402 // For views inside a scrolling container, delay the pressed feedback for 8403 // a short period in case this is a scroll. 8404 if (isInScrollingContainer) { 8405 mPrivateFlags |= PFLAG_PREPRESSED; 8406 if (mPendingCheckForTap == null) { 8407 mPendingCheckForTap = new CheckForTap(); 8408 } 8409 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 8410 } else { 8411 // Not inside a scrolling container, so show the feedback right away 8412 setPressed(true); 8413 checkForLongClick(0); 8414 } 8415 break; 8416 8417 case MotionEvent.ACTION_CANCEL: 8418 setPressed(false); 8419 removeTapCallback(); 8420 removeLongPressCallback(); 8421 break; 8422 8423 case MotionEvent.ACTION_MOVE: 8424 final int x = (int) event.getX(); 8425 final int y = (int) event.getY(); 8426 8427 // Be lenient about moving outside of buttons 8428 if (!pointInView(x, y, mTouchSlop)) { 8429 // Outside button 8430 removeTapCallback(); 8431 if ((mPrivateFlags & PFLAG_PRESSED) != 0) { 8432 // Remove any future long press/tap checks 8433 removeLongPressCallback(); 8434 8435 setPressed(false); 8436 } 8437 } 8438 break; 8439 } 8440 return true; 8441 } 8442 8443 return false; 8444 } 8445 8446 /** 8447 * @hide 8448 */ 8449 public boolean isInScrollingContainer() { 8450 ViewParent p = getParent(); 8451 while (p != null && p instanceof ViewGroup) { 8452 if (((ViewGroup) p).shouldDelayChildPressedState()) { 8453 return true; 8454 } 8455 p = p.getParent(); 8456 } 8457 return false; 8458 } 8459 8460 /** 8461 * Remove the longpress detection timer. 8462 */ 8463 private void removeLongPressCallback() { 8464 if (mPendingCheckForLongPress != null) { 8465 removeCallbacks(mPendingCheckForLongPress); 8466 } 8467 } 8468 8469 /** 8470 * Remove the pending click action 8471 */ 8472 private void removePerformClickCallback() { 8473 if (mPerformClick != null) { 8474 removeCallbacks(mPerformClick); 8475 } 8476 } 8477 8478 /** 8479 * Remove the prepress detection timer. 8480 */ 8481 private void removeUnsetPressCallback() { 8482 if ((mPrivateFlags & PFLAG_PRESSED) != 0 && mUnsetPressedState != null) { 8483 setPressed(false); 8484 removeCallbacks(mUnsetPressedState); 8485 } 8486 } 8487 8488 /** 8489 * Remove the tap detection timer. 8490 */ 8491 private void removeTapCallback() { 8492 if (mPendingCheckForTap != null) { 8493 mPrivateFlags &= ~PFLAG_PREPRESSED; 8494 removeCallbacks(mPendingCheckForTap); 8495 } 8496 } 8497 8498 /** 8499 * Cancels a pending long press. Your subclass can use this if you 8500 * want the context menu to come up if the user presses and holds 8501 * at the same place, but you don't want it to come up if they press 8502 * and then move around enough to cause scrolling. 8503 */ 8504 public void cancelLongPress() { 8505 removeLongPressCallback(); 8506 8507 /* 8508 * The prepressed state handled by the tap callback is a display 8509 * construct, but the tap callback will post a long press callback 8510 * less its own timeout. Remove it here. 8511 */ 8512 removeTapCallback(); 8513 } 8514 8515 /** 8516 * Remove the pending callback for sending a 8517 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8518 */ 8519 private void removeSendViewScrolledAccessibilityEventCallback() { 8520 if (mSendViewScrolledAccessibilityEvent != null) { 8521 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8522 mSendViewScrolledAccessibilityEvent.mIsPending = false; 8523 } 8524 } 8525 8526 /** 8527 * Sets the TouchDelegate for this View. 8528 */ 8529 public void setTouchDelegate(TouchDelegate delegate) { 8530 mTouchDelegate = delegate; 8531 } 8532 8533 /** 8534 * Gets the TouchDelegate for this View. 8535 */ 8536 public TouchDelegate getTouchDelegate() { 8537 return mTouchDelegate; 8538 } 8539 8540 /** 8541 * Set flags controlling behavior of this view. 8542 * 8543 * @param flags Constant indicating the value which should be set 8544 * @param mask Constant indicating the bit range that should be changed 8545 */ 8546 void setFlags(int flags, int mask) { 8547 int old = mViewFlags; 8548 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8549 8550 int changed = mViewFlags ^ old; 8551 if (changed == 0) { 8552 return; 8553 } 8554 int privateFlags = mPrivateFlags; 8555 8556 /* Check if the FOCUSABLE bit has changed */ 8557 if (((changed & FOCUSABLE_MASK) != 0) && 8558 ((privateFlags & PFLAG_HAS_BOUNDS) !=0)) { 8559 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8560 && ((privateFlags & PFLAG_FOCUSED) != 0)) { 8561 /* Give up focus if we are no longer focusable */ 8562 clearFocus(); 8563 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8564 && ((privateFlags & PFLAG_FOCUSED) == 0)) { 8565 /* 8566 * Tell the view system that we are now available to take focus 8567 * if no one else already has it. 8568 */ 8569 if (mParent != null) mParent.focusableViewAvailable(this); 8570 } 8571 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8572 notifyAccessibilityStateChanged(); 8573 } 8574 } 8575 8576 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8577 if ((changed & VISIBILITY_MASK) != 0) { 8578 /* 8579 * If this view is becoming visible, invalidate it in case it changed while 8580 * it was not visible. Marking it drawn ensures that the invalidation will 8581 * go through. 8582 */ 8583 mPrivateFlags |= PFLAG_DRAWN; 8584 invalidate(true); 8585 8586 needGlobalAttributesUpdate(true); 8587 8588 // a view becoming visible is worth notifying the parent 8589 // about in case nothing has focus. even if this specific view 8590 // isn't focusable, it may contain something that is, so let 8591 // the root view try to give this focus if nothing else does. 8592 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8593 mParent.focusableViewAvailable(this); 8594 } 8595 } 8596 } 8597 8598 /* Check if the GONE bit has changed */ 8599 if ((changed & GONE) != 0) { 8600 needGlobalAttributesUpdate(false); 8601 requestLayout(); 8602 8603 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8604 if (hasFocus()) clearFocus(); 8605 clearAccessibilityFocus(); 8606 destroyDrawingCache(); 8607 if (mParent instanceof View) { 8608 // GONE views noop invalidation, so invalidate the parent 8609 ((View) mParent).invalidate(true); 8610 } 8611 // Mark the view drawn to ensure that it gets invalidated properly the next 8612 // time it is visible and gets invalidated 8613 mPrivateFlags |= PFLAG_DRAWN; 8614 } 8615 if (mAttachInfo != null) { 8616 mAttachInfo.mViewVisibilityChanged = true; 8617 } 8618 } 8619 8620 /* Check if the VISIBLE bit has changed */ 8621 if ((changed & INVISIBLE) != 0) { 8622 needGlobalAttributesUpdate(false); 8623 /* 8624 * If this view is becoming invisible, set the DRAWN flag so that 8625 * the next invalidate() will not be skipped. 8626 */ 8627 mPrivateFlags |= PFLAG_DRAWN; 8628 8629 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8630 // root view becoming invisible shouldn't clear focus and accessibility focus 8631 if (getRootView() != this) { 8632 clearFocus(); 8633 clearAccessibilityFocus(); 8634 } 8635 } 8636 if (mAttachInfo != null) { 8637 mAttachInfo.mViewVisibilityChanged = true; 8638 } 8639 } 8640 8641 if ((changed & VISIBILITY_MASK) != 0) { 8642 if (mParent instanceof ViewGroup) { 8643 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8644 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8645 ((View) mParent).invalidate(true); 8646 } else if (mParent != null) { 8647 mParent.invalidateChild(this, null); 8648 } 8649 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8650 } 8651 8652 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8653 destroyDrawingCache(); 8654 } 8655 8656 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8657 destroyDrawingCache(); 8658 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8659 invalidateParentCaches(); 8660 } 8661 8662 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8663 destroyDrawingCache(); 8664 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 8665 } 8666 8667 if ((changed & DRAW_MASK) != 0) { 8668 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8669 if (mBackground != null) { 8670 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8671 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 8672 } else { 8673 mPrivateFlags |= PFLAG_SKIP_DRAW; 8674 } 8675 } else { 8676 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 8677 } 8678 requestLayout(); 8679 invalidate(true); 8680 } 8681 8682 if ((changed & KEEP_SCREEN_ON) != 0) { 8683 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8684 mParent.recomputeViewAttributes(this); 8685 } 8686 } 8687 8688 if (AccessibilityManager.getInstance(mContext).isEnabled() 8689 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8690 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8691 notifyAccessibilityStateChanged(); 8692 } 8693 } 8694 8695 /** 8696 * Change the view's z order in the tree, so it's on top of other sibling 8697 * views 8698 */ 8699 public void bringToFront() { 8700 if (mParent != null) { 8701 mParent.bringChildToFront(this); 8702 } 8703 } 8704 8705 /** 8706 * This is called in response to an internal scroll in this view (i.e., the 8707 * view scrolled its own contents). This is typically as a result of 8708 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8709 * called. 8710 * 8711 * @param l Current horizontal scroll origin. 8712 * @param t Current vertical scroll origin. 8713 * @param oldl Previous horizontal scroll origin. 8714 * @param oldt Previous vertical scroll origin. 8715 */ 8716 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8717 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8718 postSendViewScrolledAccessibilityEventCallback(); 8719 } 8720 8721 mBackgroundSizeChanged = true; 8722 8723 final AttachInfo ai = mAttachInfo; 8724 if (ai != null) { 8725 ai.mViewScrollChanged = true; 8726 } 8727 } 8728 8729 /** 8730 * Interface definition for a callback to be invoked when the layout bounds of a view 8731 * changes due to layout processing. 8732 */ 8733 public interface OnLayoutChangeListener { 8734 /** 8735 * Called when the focus state of a view has changed. 8736 * 8737 * @param v The view whose state has changed. 8738 * @param left The new value of the view's left property. 8739 * @param top The new value of the view's top property. 8740 * @param right The new value of the view's right property. 8741 * @param bottom The new value of the view's bottom property. 8742 * @param oldLeft The previous value of the view's left property. 8743 * @param oldTop The previous value of the view's top property. 8744 * @param oldRight The previous value of the view's right property. 8745 * @param oldBottom The previous value of the view's bottom property. 8746 */ 8747 void onLayoutChange(View v, int left, int top, int right, int bottom, 8748 int oldLeft, int oldTop, int oldRight, int oldBottom); 8749 } 8750 8751 /** 8752 * This is called during layout when the size of this view has changed. If 8753 * you were just added to the view hierarchy, you're called with the old 8754 * values of 0. 8755 * 8756 * @param w Current width of this view. 8757 * @param h Current height of this view. 8758 * @param oldw Old width of this view. 8759 * @param oldh Old height of this view. 8760 */ 8761 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8762 } 8763 8764 /** 8765 * Called by draw to draw the child views. This may be overridden 8766 * by derived classes to gain control just before its children are drawn 8767 * (but after its own view has been drawn). 8768 * @param canvas the canvas on which to draw the view 8769 */ 8770 protected void dispatchDraw(Canvas canvas) { 8771 8772 } 8773 8774 /** 8775 * Gets the parent of this view. Note that the parent is a 8776 * ViewParent and not necessarily a View. 8777 * 8778 * @return Parent of this view. 8779 */ 8780 public final ViewParent getParent() { 8781 return mParent; 8782 } 8783 8784 /** 8785 * Set the horizontal scrolled position of your view. This will cause a call to 8786 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8787 * invalidated. 8788 * @param value the x position to scroll to 8789 */ 8790 public void setScrollX(int value) { 8791 scrollTo(value, mScrollY); 8792 } 8793 8794 /** 8795 * Set the vertical scrolled position of your view. This will cause a call to 8796 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8797 * invalidated. 8798 * @param value the y position to scroll to 8799 */ 8800 public void setScrollY(int value) { 8801 scrollTo(mScrollX, value); 8802 } 8803 8804 /** 8805 * Return the scrolled left position of this view. This is the left edge of 8806 * the displayed part of your view. You do not need to draw any pixels 8807 * farther left, since those are outside of the frame of your view on 8808 * screen. 8809 * 8810 * @return The left edge of the displayed part of your view, in pixels. 8811 */ 8812 public final int getScrollX() { 8813 return mScrollX; 8814 } 8815 8816 /** 8817 * Return the scrolled top position of this view. This is the top edge of 8818 * the displayed part of your view. You do not need to draw any pixels above 8819 * it, since those are outside of the frame of your view on screen. 8820 * 8821 * @return The top edge of the displayed part of your view, in pixels. 8822 */ 8823 public final int getScrollY() { 8824 return mScrollY; 8825 } 8826 8827 /** 8828 * Return the width of the your view. 8829 * 8830 * @return The width of your view, in pixels. 8831 */ 8832 @ViewDebug.ExportedProperty(category = "layout") 8833 public final int getWidth() { 8834 return mRight - mLeft; 8835 } 8836 8837 /** 8838 * Return the height of your view. 8839 * 8840 * @return The height of your view, in pixels. 8841 */ 8842 @ViewDebug.ExportedProperty(category = "layout") 8843 public final int getHeight() { 8844 return mBottom - mTop; 8845 } 8846 8847 /** 8848 * Return the visible drawing bounds of your view. Fills in the output 8849 * rectangle with the values from getScrollX(), getScrollY(), 8850 * getWidth(), and getHeight(). These bounds do not account for any 8851 * transformation properties currently set on the view, such as 8852 * {@link #setScaleX(float)} or {@link #setRotation(float)}. 8853 * 8854 * @param outRect The (scrolled) drawing bounds of the view. 8855 */ 8856 public void getDrawingRect(Rect outRect) { 8857 outRect.left = mScrollX; 8858 outRect.top = mScrollY; 8859 outRect.right = mScrollX + (mRight - mLeft); 8860 outRect.bottom = mScrollY + (mBottom - mTop); 8861 } 8862 8863 /** 8864 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8865 * raw width component (that is the result is masked by 8866 * {@link #MEASURED_SIZE_MASK}). 8867 * 8868 * @return The raw measured width of this view. 8869 */ 8870 public final int getMeasuredWidth() { 8871 return mMeasuredWidth & MEASURED_SIZE_MASK; 8872 } 8873 8874 /** 8875 * Return the full width measurement information for this view as computed 8876 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8877 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8878 * This should be used during measurement and layout calculations only. Use 8879 * {@link #getWidth()} to see how wide a view is after layout. 8880 * 8881 * @return The measured width of this view as a bit mask. 8882 */ 8883 public final int getMeasuredWidthAndState() { 8884 return mMeasuredWidth; 8885 } 8886 8887 /** 8888 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8889 * raw width component (that is the result is masked by 8890 * {@link #MEASURED_SIZE_MASK}). 8891 * 8892 * @return The raw measured height of this view. 8893 */ 8894 public final int getMeasuredHeight() { 8895 return mMeasuredHeight & MEASURED_SIZE_MASK; 8896 } 8897 8898 /** 8899 * Return the full height measurement information for this view as computed 8900 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8901 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8902 * This should be used during measurement and layout calculations only. Use 8903 * {@link #getHeight()} to see how wide a view is after layout. 8904 * 8905 * @return The measured width of this view as a bit mask. 8906 */ 8907 public final int getMeasuredHeightAndState() { 8908 return mMeasuredHeight; 8909 } 8910 8911 /** 8912 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8913 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8914 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8915 * and the height component is at the shifted bits 8916 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8917 */ 8918 public final int getMeasuredState() { 8919 return (mMeasuredWidth&MEASURED_STATE_MASK) 8920 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8921 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8922 } 8923 8924 /** 8925 * The transform matrix of this view, which is calculated based on the current 8926 * roation, scale, and pivot properties. 8927 * 8928 * @see #getRotation() 8929 * @see #getScaleX() 8930 * @see #getScaleY() 8931 * @see #getPivotX() 8932 * @see #getPivotY() 8933 * @return The current transform matrix for the view 8934 */ 8935 public Matrix getMatrix() { 8936 if (mTransformationInfo != null) { 8937 updateMatrix(); 8938 return mTransformationInfo.mMatrix; 8939 } 8940 return Matrix.IDENTITY_MATRIX; 8941 } 8942 8943 /** 8944 * Utility function to determine if the value is far enough away from zero to be 8945 * considered non-zero. 8946 * @param value A floating point value to check for zero-ness 8947 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8948 */ 8949 private static boolean nonzero(float value) { 8950 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8951 } 8952 8953 /** 8954 * Returns true if the transform matrix is the identity matrix. 8955 * Recomputes the matrix if necessary. 8956 * 8957 * @return True if the transform matrix is the identity matrix, false otherwise. 8958 */ 8959 final boolean hasIdentityMatrix() { 8960 if (mTransformationInfo != null) { 8961 updateMatrix(); 8962 return mTransformationInfo.mMatrixIsIdentity; 8963 } 8964 return true; 8965 } 8966 8967 void ensureTransformationInfo() { 8968 if (mTransformationInfo == null) { 8969 mTransformationInfo = new TransformationInfo(); 8970 } 8971 } 8972 8973 /** 8974 * Recomputes the transform matrix if necessary. 8975 */ 8976 private void updateMatrix() { 8977 final TransformationInfo info = mTransformationInfo; 8978 if (info == null) { 8979 return; 8980 } 8981 if (info.mMatrixDirty) { 8982 // transform-related properties have changed since the last time someone 8983 // asked for the matrix; recalculate it with the current values 8984 8985 // Figure out if we need to update the pivot point 8986 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 8987 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8988 info.mPrevWidth = mRight - mLeft; 8989 info.mPrevHeight = mBottom - mTop; 8990 info.mPivotX = info.mPrevWidth / 2f; 8991 info.mPivotY = info.mPrevHeight / 2f; 8992 } 8993 } 8994 info.mMatrix.reset(); 8995 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8996 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8997 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8998 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8999 } else { 9000 if (info.mCamera == null) { 9001 info.mCamera = new Camera(); 9002 info.matrix3D = new Matrix(); 9003 } 9004 info.mCamera.save(); 9005 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 9006 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 9007 info.mCamera.getMatrix(info.matrix3D); 9008 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 9009 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 9010 info.mPivotY + info.mTranslationY); 9011 info.mMatrix.postConcat(info.matrix3D); 9012 info.mCamera.restore(); 9013 } 9014 info.mMatrixDirty = false; 9015 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 9016 info.mInverseMatrixDirty = true; 9017 } 9018 } 9019 9020 /** 9021 * Utility method to retrieve the inverse of the current mMatrix property. 9022 * We cache the matrix to avoid recalculating it when transform properties 9023 * have not changed. 9024 * 9025 * @return The inverse of the current matrix of this view. 9026 */ 9027 final Matrix getInverseMatrix() { 9028 final TransformationInfo info = mTransformationInfo; 9029 if (info != null) { 9030 updateMatrix(); 9031 if (info.mInverseMatrixDirty) { 9032 if (info.mInverseMatrix == null) { 9033 info.mInverseMatrix = new Matrix(); 9034 } 9035 info.mMatrix.invert(info.mInverseMatrix); 9036 info.mInverseMatrixDirty = false; 9037 } 9038 return info.mInverseMatrix; 9039 } 9040 return Matrix.IDENTITY_MATRIX; 9041 } 9042 9043 /** 9044 * Gets the distance along the Z axis from the camera to this view. 9045 * 9046 * @see #setCameraDistance(float) 9047 * 9048 * @return The distance along the Z axis. 9049 */ 9050 public float getCameraDistance() { 9051 ensureTransformationInfo(); 9052 final float dpi = mResources.getDisplayMetrics().densityDpi; 9053 final TransformationInfo info = mTransformationInfo; 9054 if (info.mCamera == null) { 9055 info.mCamera = new Camera(); 9056 info.matrix3D = new Matrix(); 9057 } 9058 return -(info.mCamera.getLocationZ() * dpi); 9059 } 9060 9061 /** 9062 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 9063 * views are drawn) from the camera to this view. The camera's distance 9064 * affects 3D transformations, for instance rotations around the X and Y 9065 * axis. If the rotationX or rotationY properties are changed and this view is 9066 * large (more than half the size of the screen), it is recommended to always 9067 * use a camera distance that's greater than the height (X axis rotation) or 9068 * the width (Y axis rotation) of this view.</p> 9069 * 9070 * <p>The distance of the camera from the view plane can have an affect on the 9071 * perspective distortion of the view when it is rotated around the x or y axis. 9072 * For example, a large distance will result in a large viewing angle, and there 9073 * will not be much perspective distortion of the view as it rotates. A short 9074 * distance may cause much more perspective distortion upon rotation, and can 9075 * also result in some drawing artifacts if the rotated view ends up partially 9076 * behind the camera (which is why the recommendation is to use a distance at 9077 * least as far as the size of the view, if the view is to be rotated.)</p> 9078 * 9079 * <p>The distance is expressed in "depth pixels." The default distance depends 9080 * on the screen density. For instance, on a medium density display, the 9081 * default distance is 1280. On a high density display, the default distance 9082 * is 1920.</p> 9083 * 9084 * <p>If you want to specify a distance that leads to visually consistent 9085 * results across various densities, use the following formula:</p> 9086 * <pre> 9087 * float scale = context.getResources().getDisplayMetrics().density; 9088 * view.setCameraDistance(distance * scale); 9089 * </pre> 9090 * 9091 * <p>The density scale factor of a high density display is 1.5, 9092 * and 1920 = 1280 * 1.5.</p> 9093 * 9094 * @param distance The distance in "depth pixels", if negative the opposite 9095 * value is used 9096 * 9097 * @see #setRotationX(float) 9098 * @see #setRotationY(float) 9099 */ 9100 public void setCameraDistance(float distance) { 9101 invalidateViewProperty(true, false); 9102 9103 ensureTransformationInfo(); 9104 final float dpi = mResources.getDisplayMetrics().densityDpi; 9105 final TransformationInfo info = mTransformationInfo; 9106 if (info.mCamera == null) { 9107 info.mCamera = new Camera(); 9108 info.matrix3D = new Matrix(); 9109 } 9110 9111 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 9112 info.mMatrixDirty = true; 9113 9114 invalidateViewProperty(false, false); 9115 if (mDisplayList != null) { 9116 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 9117 } 9118 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9119 // View was rejected last time it was drawn by its parent; this may have changed 9120 invalidateParentIfNeeded(); 9121 } 9122 } 9123 9124 /** 9125 * The degrees that the view is rotated around the pivot point. 9126 * 9127 * @see #setRotation(float) 9128 * @see #getPivotX() 9129 * @see #getPivotY() 9130 * 9131 * @return The degrees of rotation. 9132 */ 9133 @ViewDebug.ExportedProperty(category = "drawing") 9134 public float getRotation() { 9135 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 9136 } 9137 9138 /** 9139 * Sets the degrees that the view is rotated around the pivot point. Increasing values 9140 * result in clockwise rotation. 9141 * 9142 * @param rotation The degrees of rotation. 9143 * 9144 * @see #getRotation() 9145 * @see #getPivotX() 9146 * @see #getPivotY() 9147 * @see #setRotationX(float) 9148 * @see #setRotationY(float) 9149 * 9150 * @attr ref android.R.styleable#View_rotation 9151 */ 9152 public void setRotation(float rotation) { 9153 ensureTransformationInfo(); 9154 final TransformationInfo info = mTransformationInfo; 9155 if (info.mRotation != rotation) { 9156 // Double-invalidation is necessary to capture view's old and new areas 9157 invalidateViewProperty(true, false); 9158 info.mRotation = rotation; 9159 info.mMatrixDirty = true; 9160 invalidateViewProperty(false, true); 9161 if (mDisplayList != null) { 9162 mDisplayList.setRotation(rotation); 9163 } 9164 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9165 // View was rejected last time it was drawn by its parent; this may have changed 9166 invalidateParentIfNeeded(); 9167 } 9168 } 9169 } 9170 9171 /** 9172 * The degrees that the view is rotated around the vertical axis through the pivot point. 9173 * 9174 * @see #getPivotX() 9175 * @see #getPivotY() 9176 * @see #setRotationY(float) 9177 * 9178 * @return The degrees of Y rotation. 9179 */ 9180 @ViewDebug.ExportedProperty(category = "drawing") 9181 public float getRotationY() { 9182 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 9183 } 9184 9185 /** 9186 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 9187 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 9188 * down the y axis. 9189 * 9190 * When rotating large views, it is recommended to adjust the camera distance 9191 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9192 * 9193 * @param rotationY The degrees of Y rotation. 9194 * 9195 * @see #getRotationY() 9196 * @see #getPivotX() 9197 * @see #getPivotY() 9198 * @see #setRotation(float) 9199 * @see #setRotationX(float) 9200 * @see #setCameraDistance(float) 9201 * 9202 * @attr ref android.R.styleable#View_rotationY 9203 */ 9204 public void setRotationY(float rotationY) { 9205 ensureTransformationInfo(); 9206 final TransformationInfo info = mTransformationInfo; 9207 if (info.mRotationY != rotationY) { 9208 invalidateViewProperty(true, false); 9209 info.mRotationY = rotationY; 9210 info.mMatrixDirty = true; 9211 invalidateViewProperty(false, true); 9212 if (mDisplayList != null) { 9213 mDisplayList.setRotationY(rotationY); 9214 } 9215 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9216 // View was rejected last time it was drawn by its parent; this may have changed 9217 invalidateParentIfNeeded(); 9218 } 9219 } 9220 } 9221 9222 /** 9223 * The degrees that the view is rotated around the horizontal axis through the pivot point. 9224 * 9225 * @see #getPivotX() 9226 * @see #getPivotY() 9227 * @see #setRotationX(float) 9228 * 9229 * @return The degrees of X rotation. 9230 */ 9231 @ViewDebug.ExportedProperty(category = "drawing") 9232 public float getRotationX() { 9233 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 9234 } 9235 9236 /** 9237 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 9238 * Increasing values result in clockwise rotation from the viewpoint of looking down the 9239 * x axis. 9240 * 9241 * When rotating large views, it is recommended to adjust the camera distance 9242 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 9243 * 9244 * @param rotationX The degrees of X rotation. 9245 * 9246 * @see #getRotationX() 9247 * @see #getPivotX() 9248 * @see #getPivotY() 9249 * @see #setRotation(float) 9250 * @see #setRotationY(float) 9251 * @see #setCameraDistance(float) 9252 * 9253 * @attr ref android.R.styleable#View_rotationX 9254 */ 9255 public void setRotationX(float rotationX) { 9256 ensureTransformationInfo(); 9257 final TransformationInfo info = mTransformationInfo; 9258 if (info.mRotationX != rotationX) { 9259 invalidateViewProperty(true, false); 9260 info.mRotationX = rotationX; 9261 info.mMatrixDirty = true; 9262 invalidateViewProperty(false, true); 9263 if (mDisplayList != null) { 9264 mDisplayList.setRotationX(rotationX); 9265 } 9266 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9267 // View was rejected last time it was drawn by its parent; this may have changed 9268 invalidateParentIfNeeded(); 9269 } 9270 } 9271 } 9272 9273 /** 9274 * The amount that the view is scaled in x around the pivot point, as a proportion of 9275 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 9276 * 9277 * <p>By default, this is 1.0f. 9278 * 9279 * @see #getPivotX() 9280 * @see #getPivotY() 9281 * @return The scaling factor. 9282 */ 9283 @ViewDebug.ExportedProperty(category = "drawing") 9284 public float getScaleX() { 9285 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 9286 } 9287 9288 /** 9289 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 9290 * the view's unscaled width. A value of 1 means that no scaling is applied. 9291 * 9292 * @param scaleX The scaling factor. 9293 * @see #getPivotX() 9294 * @see #getPivotY() 9295 * 9296 * @attr ref android.R.styleable#View_scaleX 9297 */ 9298 public void setScaleX(float scaleX) { 9299 ensureTransformationInfo(); 9300 final TransformationInfo info = mTransformationInfo; 9301 if (info.mScaleX != scaleX) { 9302 invalidateViewProperty(true, false); 9303 info.mScaleX = scaleX; 9304 info.mMatrixDirty = true; 9305 invalidateViewProperty(false, true); 9306 if (mDisplayList != null) { 9307 mDisplayList.setScaleX(scaleX); 9308 } 9309 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9310 // View was rejected last time it was drawn by its parent; this may have changed 9311 invalidateParentIfNeeded(); 9312 } 9313 } 9314 } 9315 9316 /** 9317 * The amount that the view is scaled in y around the pivot point, as a proportion of 9318 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 9319 * 9320 * <p>By default, this is 1.0f. 9321 * 9322 * @see #getPivotX() 9323 * @see #getPivotY() 9324 * @return The scaling factor. 9325 */ 9326 @ViewDebug.ExportedProperty(category = "drawing") 9327 public float getScaleY() { 9328 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 9329 } 9330 9331 /** 9332 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 9333 * the view's unscaled width. A value of 1 means that no scaling is applied. 9334 * 9335 * @param scaleY The scaling factor. 9336 * @see #getPivotX() 9337 * @see #getPivotY() 9338 * 9339 * @attr ref android.R.styleable#View_scaleY 9340 */ 9341 public void setScaleY(float scaleY) { 9342 ensureTransformationInfo(); 9343 final TransformationInfo info = mTransformationInfo; 9344 if (info.mScaleY != scaleY) { 9345 invalidateViewProperty(true, false); 9346 info.mScaleY = scaleY; 9347 info.mMatrixDirty = true; 9348 invalidateViewProperty(false, true); 9349 if (mDisplayList != null) { 9350 mDisplayList.setScaleY(scaleY); 9351 } 9352 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9353 // View was rejected last time it was drawn by its parent; this may have changed 9354 invalidateParentIfNeeded(); 9355 } 9356 } 9357 } 9358 9359 /** 9360 * The x location of the point around which the view is {@link #setRotation(float) rotated} 9361 * and {@link #setScaleX(float) scaled}. 9362 * 9363 * @see #getRotation() 9364 * @see #getScaleX() 9365 * @see #getScaleY() 9366 * @see #getPivotY() 9367 * @return The x location of the pivot point. 9368 * 9369 * @attr ref android.R.styleable#View_transformPivotX 9370 */ 9371 @ViewDebug.ExportedProperty(category = "drawing") 9372 public float getPivotX() { 9373 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 9374 } 9375 9376 /** 9377 * Sets the x location of the point around which the view is 9378 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 9379 * By default, the pivot point is centered on the object. 9380 * Setting this property disables this behavior and causes the view to use only the 9381 * explicitly set pivotX and pivotY values. 9382 * 9383 * @param pivotX The x location of the pivot point. 9384 * @see #getRotation() 9385 * @see #getScaleX() 9386 * @see #getScaleY() 9387 * @see #getPivotY() 9388 * 9389 * @attr ref android.R.styleable#View_transformPivotX 9390 */ 9391 public void setPivotX(float pivotX) { 9392 ensureTransformationInfo(); 9393 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9394 final TransformationInfo info = mTransformationInfo; 9395 if (info.mPivotX != pivotX) { 9396 invalidateViewProperty(true, false); 9397 info.mPivotX = pivotX; 9398 info.mMatrixDirty = true; 9399 invalidateViewProperty(false, true); 9400 if (mDisplayList != null) { 9401 mDisplayList.setPivotX(pivotX); 9402 } 9403 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9404 // View was rejected last time it was drawn by its parent; this may have changed 9405 invalidateParentIfNeeded(); 9406 } 9407 } 9408 } 9409 9410 /** 9411 * The y location of the point around which the view is {@link #setRotation(float) rotated} 9412 * and {@link #setScaleY(float) scaled}. 9413 * 9414 * @see #getRotation() 9415 * @see #getScaleX() 9416 * @see #getScaleY() 9417 * @see #getPivotY() 9418 * @return The y location of the pivot point. 9419 * 9420 * @attr ref android.R.styleable#View_transformPivotY 9421 */ 9422 @ViewDebug.ExportedProperty(category = "drawing") 9423 public float getPivotY() { 9424 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 9425 } 9426 9427 /** 9428 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 9429 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 9430 * Setting this property disables this behavior and causes the view to use only the 9431 * explicitly set pivotX and pivotY values. 9432 * 9433 * @param pivotY The y location of the pivot point. 9434 * @see #getRotation() 9435 * @see #getScaleX() 9436 * @see #getScaleY() 9437 * @see #getPivotY() 9438 * 9439 * @attr ref android.R.styleable#View_transformPivotY 9440 */ 9441 public void setPivotY(float pivotY) { 9442 ensureTransformationInfo(); 9443 mPrivateFlags |= PFLAG_PIVOT_EXPLICITLY_SET; 9444 final TransformationInfo info = mTransformationInfo; 9445 if (info.mPivotY != pivotY) { 9446 invalidateViewProperty(true, false); 9447 info.mPivotY = pivotY; 9448 info.mMatrixDirty = true; 9449 invalidateViewProperty(false, true); 9450 if (mDisplayList != null) { 9451 mDisplayList.setPivotY(pivotY); 9452 } 9453 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9454 // View was rejected last time it was drawn by its parent; this may have changed 9455 invalidateParentIfNeeded(); 9456 } 9457 } 9458 } 9459 9460 /** 9461 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 9462 * completely transparent and 1 means the view is completely opaque. 9463 * 9464 * <p>By default this is 1.0f. 9465 * @return The opacity of the view. 9466 */ 9467 @ViewDebug.ExportedProperty(category = "drawing") 9468 public float getAlpha() { 9469 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 9470 } 9471 9472 /** 9473 * Returns whether this View has content which overlaps. This function, intended to be 9474 * overridden by specific View types, is an optimization when alpha is set on a view. If 9475 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 9476 * and then composited it into place, which can be expensive. If the view has no overlapping 9477 * rendering, the view can draw each primitive with the appropriate alpha value directly. 9478 * An example of overlapping rendering is a TextView with a background image, such as a 9479 * Button. An example of non-overlapping rendering is a TextView with no background, or 9480 * an ImageView with only the foreground image. The default implementation returns true; 9481 * subclasses should override if they have cases which can be optimized. 9482 * 9483 * @return true if the content in this view might overlap, false otherwise. 9484 */ 9485 public boolean hasOverlappingRendering() { 9486 return true; 9487 } 9488 9489 /** 9490 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9491 * completely transparent and 1 means the view is completely opaque.</p> 9492 * 9493 * <p> Note that setting alpha to a translucent value (0 < alpha < 1) can have significant 9494 * performance implications, especially for large views. It is best to use the alpha property 9495 * sparingly and transiently, as in the case of fading animations.</p> 9496 * 9497 * <p>For a view with a frequently changing alpha, such as during a fading animation, it is 9498 * strongly recommended for performance reasons to either override 9499 * {@link #hasOverlappingRendering()} to return false if appropriate, or setting a 9500 * {@link #setLayerType(int, android.graphics.Paint) layer type} on the view.</p> 9501 * 9502 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9503 * responsible for applying the opacity itself.</p> 9504 * 9505 * <p>Note that if the view is backed by a 9506 * {@link #setLayerType(int, android.graphics.Paint) layer} and is associated with a 9507 * {@link #setLayerPaint(android.graphics.Paint) layer paint}, setting an alpha value less than 9508 * 1.0 will supercede the alpha of the layer paint.</p> 9509 * 9510 * @param alpha The opacity of the view. 9511 * 9512 * @see #hasOverlappingRendering() 9513 * @see #setLayerType(int, android.graphics.Paint) 9514 * 9515 * @attr ref android.R.styleable#View_alpha 9516 */ 9517 public void setAlpha(float alpha) { 9518 ensureTransformationInfo(); 9519 if (mTransformationInfo.mAlpha != alpha) { 9520 mTransformationInfo.mAlpha = alpha; 9521 if (onSetAlpha((int) (alpha * 255))) { 9522 mPrivateFlags |= PFLAG_ALPHA_SET; 9523 // subclass is handling alpha - don't optimize rendering cache invalidation 9524 invalidateParentCaches(); 9525 invalidate(true); 9526 } else { 9527 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9528 invalidateViewProperty(true, false); 9529 if (mDisplayList != null) { 9530 mDisplayList.setAlpha(alpha); 9531 } 9532 } 9533 } 9534 } 9535 9536 /** 9537 * Faster version of setAlpha() which performs the same steps except there are 9538 * no calls to invalidate(). The caller of this function should perform proper invalidation 9539 * on the parent and this object. The return value indicates whether the subclass handles 9540 * alpha (the return value for onSetAlpha()). 9541 * 9542 * @param alpha The new value for the alpha property 9543 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9544 * the new value for the alpha property is different from the old value 9545 */ 9546 boolean setAlphaNoInvalidation(float alpha) { 9547 ensureTransformationInfo(); 9548 if (mTransformationInfo.mAlpha != alpha) { 9549 mTransformationInfo.mAlpha = alpha; 9550 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9551 if (subclassHandlesAlpha) { 9552 mPrivateFlags |= PFLAG_ALPHA_SET; 9553 return true; 9554 } else { 9555 mPrivateFlags &= ~PFLAG_ALPHA_SET; 9556 if (mDisplayList != null) { 9557 mDisplayList.setAlpha(alpha); 9558 } 9559 } 9560 } 9561 return false; 9562 } 9563 9564 /** 9565 * Top position of this view relative to its parent. 9566 * 9567 * @return The top of this view, in pixels. 9568 */ 9569 @ViewDebug.CapturedViewProperty 9570 public final int getTop() { 9571 return mTop; 9572 } 9573 9574 /** 9575 * Sets the top position of this view relative to its parent. This method is meant to be called 9576 * by the layout system and should not generally be called otherwise, because the property 9577 * may be changed at any time by the layout. 9578 * 9579 * @param top The top of this view, in pixels. 9580 */ 9581 public final void setTop(int top) { 9582 if (top != mTop) { 9583 updateMatrix(); 9584 final boolean matrixIsIdentity = mTransformationInfo == null 9585 || mTransformationInfo.mMatrixIsIdentity; 9586 if (matrixIsIdentity) { 9587 if (mAttachInfo != null) { 9588 int minTop; 9589 int yLoc; 9590 if (top < mTop) { 9591 minTop = top; 9592 yLoc = top - mTop; 9593 } else { 9594 minTop = mTop; 9595 yLoc = 0; 9596 } 9597 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9598 } 9599 } else { 9600 // Double-invalidation is necessary to capture view's old and new areas 9601 invalidate(true); 9602 } 9603 9604 int width = mRight - mLeft; 9605 int oldHeight = mBottom - mTop; 9606 9607 mTop = top; 9608 if (mDisplayList != null) { 9609 mDisplayList.setTop(mTop); 9610 } 9611 9612 sizeChange(width, mBottom - mTop, width, oldHeight); 9613 9614 if (!matrixIsIdentity) { 9615 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9616 // A change in dimension means an auto-centered pivot point changes, too 9617 mTransformationInfo.mMatrixDirty = true; 9618 } 9619 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9620 invalidate(true); 9621 } 9622 mBackgroundSizeChanged = true; 9623 invalidateParentIfNeeded(); 9624 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9625 // View was rejected last time it was drawn by its parent; this may have changed 9626 invalidateParentIfNeeded(); 9627 } 9628 } 9629 } 9630 9631 /** 9632 * Bottom position of this view relative to its parent. 9633 * 9634 * @return The bottom of this view, in pixels. 9635 */ 9636 @ViewDebug.CapturedViewProperty 9637 public final int getBottom() { 9638 return mBottom; 9639 } 9640 9641 /** 9642 * True if this view has changed since the last time being drawn. 9643 * 9644 * @return The dirty state of this view. 9645 */ 9646 public boolean isDirty() { 9647 return (mPrivateFlags & PFLAG_DIRTY_MASK) != 0; 9648 } 9649 9650 /** 9651 * Sets the bottom position of this view relative to its parent. This method is meant to be 9652 * called by the layout system and should not generally be called otherwise, because the 9653 * property may be changed at any time by the layout. 9654 * 9655 * @param bottom The bottom of this view, in pixels. 9656 */ 9657 public final void setBottom(int bottom) { 9658 if (bottom != mBottom) { 9659 updateMatrix(); 9660 final boolean matrixIsIdentity = mTransformationInfo == null 9661 || mTransformationInfo.mMatrixIsIdentity; 9662 if (matrixIsIdentity) { 9663 if (mAttachInfo != null) { 9664 int maxBottom; 9665 if (bottom < mBottom) { 9666 maxBottom = mBottom; 9667 } else { 9668 maxBottom = bottom; 9669 } 9670 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9671 } 9672 } else { 9673 // Double-invalidation is necessary to capture view's old and new areas 9674 invalidate(true); 9675 } 9676 9677 int width = mRight - mLeft; 9678 int oldHeight = mBottom - mTop; 9679 9680 mBottom = bottom; 9681 if (mDisplayList != null) { 9682 mDisplayList.setBottom(mBottom); 9683 } 9684 9685 sizeChange(width, mBottom - mTop, width, oldHeight); 9686 9687 if (!matrixIsIdentity) { 9688 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9689 // A change in dimension means an auto-centered pivot point changes, too 9690 mTransformationInfo.mMatrixDirty = true; 9691 } 9692 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9693 invalidate(true); 9694 } 9695 mBackgroundSizeChanged = true; 9696 invalidateParentIfNeeded(); 9697 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9698 // View was rejected last time it was drawn by its parent; this may have changed 9699 invalidateParentIfNeeded(); 9700 } 9701 } 9702 } 9703 9704 /** 9705 * Left position of this view relative to its parent. 9706 * 9707 * @return The left edge of this view, in pixels. 9708 */ 9709 @ViewDebug.CapturedViewProperty 9710 public final int getLeft() { 9711 return mLeft; 9712 } 9713 9714 /** 9715 * Sets the left position of this view relative to its parent. This method is meant to be called 9716 * by the layout system and should not generally be called otherwise, because the property 9717 * may be changed at any time by the layout. 9718 * 9719 * @param left The bottom of this view, in pixels. 9720 */ 9721 public final void setLeft(int left) { 9722 if (left != mLeft) { 9723 updateMatrix(); 9724 final boolean matrixIsIdentity = mTransformationInfo == null 9725 || mTransformationInfo.mMatrixIsIdentity; 9726 if (matrixIsIdentity) { 9727 if (mAttachInfo != null) { 9728 int minLeft; 9729 int xLoc; 9730 if (left < mLeft) { 9731 minLeft = left; 9732 xLoc = left - mLeft; 9733 } else { 9734 minLeft = mLeft; 9735 xLoc = 0; 9736 } 9737 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9738 } 9739 } else { 9740 // Double-invalidation is necessary to capture view's old and new areas 9741 invalidate(true); 9742 } 9743 9744 int oldWidth = mRight - mLeft; 9745 int height = mBottom - mTop; 9746 9747 mLeft = left; 9748 if (mDisplayList != null) { 9749 mDisplayList.setLeft(left); 9750 } 9751 9752 sizeChange(mRight - mLeft, height, oldWidth, height); 9753 9754 if (!matrixIsIdentity) { 9755 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9756 // A change in dimension means an auto-centered pivot point changes, too 9757 mTransformationInfo.mMatrixDirty = true; 9758 } 9759 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9760 invalidate(true); 9761 } 9762 mBackgroundSizeChanged = true; 9763 invalidateParentIfNeeded(); 9764 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9765 // View was rejected last time it was drawn by its parent; this may have changed 9766 invalidateParentIfNeeded(); 9767 } 9768 } 9769 } 9770 9771 /** 9772 * Right position of this view relative to its parent. 9773 * 9774 * @return The right edge of this view, in pixels. 9775 */ 9776 @ViewDebug.CapturedViewProperty 9777 public final int getRight() { 9778 return mRight; 9779 } 9780 9781 /** 9782 * Sets the right position of this view relative to its parent. This method is meant to be called 9783 * by the layout system and should not generally be called otherwise, because the property 9784 * may be changed at any time by the layout. 9785 * 9786 * @param right The bottom of this view, in pixels. 9787 */ 9788 public final void setRight(int right) { 9789 if (right != mRight) { 9790 updateMatrix(); 9791 final boolean matrixIsIdentity = mTransformationInfo == null 9792 || mTransformationInfo.mMatrixIsIdentity; 9793 if (matrixIsIdentity) { 9794 if (mAttachInfo != null) { 9795 int maxRight; 9796 if (right < mRight) { 9797 maxRight = mRight; 9798 } else { 9799 maxRight = right; 9800 } 9801 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9802 } 9803 } else { 9804 // Double-invalidation is necessary to capture view's old and new areas 9805 invalidate(true); 9806 } 9807 9808 int oldWidth = mRight - mLeft; 9809 int height = mBottom - mTop; 9810 9811 mRight = right; 9812 if (mDisplayList != null) { 9813 mDisplayList.setRight(mRight); 9814 } 9815 9816 sizeChange(mRight - mLeft, height, oldWidth, height); 9817 9818 if (!matrixIsIdentity) { 9819 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 9820 // A change in dimension means an auto-centered pivot point changes, too 9821 mTransformationInfo.mMatrixDirty = true; 9822 } 9823 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 9824 invalidate(true); 9825 } 9826 mBackgroundSizeChanged = true; 9827 invalidateParentIfNeeded(); 9828 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9829 // View was rejected last time it was drawn by its parent; this may have changed 9830 invalidateParentIfNeeded(); 9831 } 9832 } 9833 } 9834 9835 /** 9836 * The visual x position of this view, in pixels. This is equivalent to the 9837 * {@link #setTranslationX(float) translationX} property plus the current 9838 * {@link #getLeft() left} property. 9839 * 9840 * @return The visual x position of this view, in pixels. 9841 */ 9842 @ViewDebug.ExportedProperty(category = "drawing") 9843 public float getX() { 9844 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9845 } 9846 9847 /** 9848 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9849 * {@link #setTranslationX(float) translationX} property to be the difference between 9850 * the x value passed in and the current {@link #getLeft() left} property. 9851 * 9852 * @param x The visual x position of this view, in pixels. 9853 */ 9854 public void setX(float x) { 9855 setTranslationX(x - mLeft); 9856 } 9857 9858 /** 9859 * The visual y position of this view, in pixels. This is equivalent to the 9860 * {@link #setTranslationY(float) translationY} property plus the current 9861 * {@link #getTop() top} property. 9862 * 9863 * @return The visual y position of this view, in pixels. 9864 */ 9865 @ViewDebug.ExportedProperty(category = "drawing") 9866 public float getY() { 9867 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9868 } 9869 9870 /** 9871 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9872 * {@link #setTranslationY(float) translationY} property to be the difference between 9873 * the y value passed in and the current {@link #getTop() top} property. 9874 * 9875 * @param y The visual y position of this view, in pixels. 9876 */ 9877 public void setY(float y) { 9878 setTranslationY(y - mTop); 9879 } 9880 9881 9882 /** 9883 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9884 * This position is post-layout, in addition to wherever the object's 9885 * layout placed it. 9886 * 9887 * @return The horizontal position of this view relative to its left position, in pixels. 9888 */ 9889 @ViewDebug.ExportedProperty(category = "drawing") 9890 public float getTranslationX() { 9891 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9892 } 9893 9894 /** 9895 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9896 * This effectively positions the object post-layout, in addition to wherever the object's 9897 * layout placed it. 9898 * 9899 * @param translationX The horizontal position of this view relative to its left position, 9900 * in pixels. 9901 * 9902 * @attr ref android.R.styleable#View_translationX 9903 */ 9904 public void setTranslationX(float translationX) { 9905 ensureTransformationInfo(); 9906 final TransformationInfo info = mTransformationInfo; 9907 if (info.mTranslationX != translationX) { 9908 // Double-invalidation is necessary to capture view's old and new areas 9909 invalidateViewProperty(true, false); 9910 info.mTranslationX = translationX; 9911 info.mMatrixDirty = true; 9912 invalidateViewProperty(false, true); 9913 if (mDisplayList != null) { 9914 mDisplayList.setTranslationX(translationX); 9915 } 9916 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9917 // View was rejected last time it was drawn by its parent; this may have changed 9918 invalidateParentIfNeeded(); 9919 } 9920 } 9921 } 9922 9923 /** 9924 * The horizontal location of this view relative to its {@link #getTop() top} position. 9925 * This position is post-layout, in addition to wherever the object's 9926 * layout placed it. 9927 * 9928 * @return The vertical position of this view relative to its top position, 9929 * in pixels. 9930 */ 9931 @ViewDebug.ExportedProperty(category = "drawing") 9932 public float getTranslationY() { 9933 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9934 } 9935 9936 /** 9937 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9938 * This effectively positions the object post-layout, in addition to wherever the object's 9939 * layout placed it. 9940 * 9941 * @param translationY The vertical position of this view relative to its top position, 9942 * in pixels. 9943 * 9944 * @attr ref android.R.styleable#View_translationY 9945 */ 9946 public void setTranslationY(float translationY) { 9947 ensureTransformationInfo(); 9948 final TransformationInfo info = mTransformationInfo; 9949 if (info.mTranslationY != translationY) { 9950 invalidateViewProperty(true, false); 9951 info.mTranslationY = translationY; 9952 info.mMatrixDirty = true; 9953 invalidateViewProperty(false, true); 9954 if (mDisplayList != null) { 9955 mDisplayList.setTranslationY(translationY); 9956 } 9957 if ((mPrivateFlags2 & PFLAG2_VIEW_QUICK_REJECTED) == PFLAG2_VIEW_QUICK_REJECTED) { 9958 // View was rejected last time it was drawn by its parent; this may have changed 9959 invalidateParentIfNeeded(); 9960 } 9961 } 9962 } 9963 9964 /** 9965 * Hit rectangle in parent's coordinates 9966 * 9967 * @param outRect The hit rectangle of the view. 9968 */ 9969 public void getHitRect(Rect outRect) { 9970 updateMatrix(); 9971 final TransformationInfo info = mTransformationInfo; 9972 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9973 outRect.set(mLeft, mTop, mRight, mBottom); 9974 } else { 9975 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9976 tmpRect.set(0, 0, getWidth(), getHeight()); 9977 info.mMatrix.mapRect(tmpRect); 9978 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9979 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9980 } 9981 } 9982 9983 /** 9984 * Determines whether the given point, in local coordinates is inside the view. 9985 */ 9986 /*package*/ final boolean pointInView(float localX, float localY) { 9987 return localX >= 0 && localX < (mRight - mLeft) 9988 && localY >= 0 && localY < (mBottom - mTop); 9989 } 9990 9991 /** 9992 * Utility method to determine whether the given point, in local coordinates, 9993 * is inside the view, where the area of the view is expanded by the slop factor. 9994 * This method is called while processing touch-move events to determine if the event 9995 * is still within the view. 9996 */ 9997 private boolean pointInView(float localX, float localY, float slop) { 9998 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9999 localY < ((mBottom - mTop) + slop); 10000 } 10001 10002 /** 10003 * When a view has focus and the user navigates away from it, the next view is searched for 10004 * starting from the rectangle filled in by this method. 10005 * 10006 * By default, the rectangle is the {@link #getDrawingRect(android.graphics.Rect)}) 10007 * of the view. However, if your view maintains some idea of internal selection, 10008 * such as a cursor, or a selected row or column, you should override this method and 10009 * fill in a more specific rectangle. 10010 * 10011 * @param r The rectangle to fill in, in this view's coordinates. 10012 */ 10013 public void getFocusedRect(Rect r) { 10014 getDrawingRect(r); 10015 } 10016 10017 /** 10018 * If some part of this view is not clipped by any of its parents, then 10019 * return that area in r in global (root) coordinates. To convert r to local 10020 * coordinates (without taking possible View rotations into account), offset 10021 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 10022 * If the view is completely clipped or translated out, return false. 10023 * 10024 * @param r If true is returned, r holds the global coordinates of the 10025 * visible portion of this view. 10026 * @param globalOffset If true is returned, globalOffset holds the dx,dy 10027 * between this view and its root. globalOffet may be null. 10028 * @return true if r is non-empty (i.e. part of the view is visible at the 10029 * root level. 10030 */ 10031 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 10032 int width = mRight - mLeft; 10033 int height = mBottom - mTop; 10034 if (width > 0 && height > 0) { 10035 r.set(0, 0, width, height); 10036 if (globalOffset != null) { 10037 globalOffset.set(-mScrollX, -mScrollY); 10038 } 10039 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 10040 } 10041 return false; 10042 } 10043 10044 public final boolean getGlobalVisibleRect(Rect r) { 10045 return getGlobalVisibleRect(r, null); 10046 } 10047 10048 public final boolean getLocalVisibleRect(Rect r) { 10049 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 10050 if (getGlobalVisibleRect(r, offset)) { 10051 r.offset(-offset.x, -offset.y); // make r local 10052 return true; 10053 } 10054 return false; 10055 } 10056 10057 /** 10058 * Offset this view's vertical location by the specified number of pixels. 10059 * 10060 * @param offset the number of pixels to offset the view by 10061 */ 10062 public void offsetTopAndBottom(int offset) { 10063 if (offset != 0) { 10064 updateMatrix(); 10065 final boolean matrixIsIdentity = mTransformationInfo == null 10066 || mTransformationInfo.mMatrixIsIdentity; 10067 if (matrixIsIdentity) { 10068 if (mDisplayList != null) { 10069 invalidateViewProperty(false, false); 10070 } else { 10071 final ViewParent p = mParent; 10072 if (p != null && mAttachInfo != null) { 10073 final Rect r = mAttachInfo.mTmpInvalRect; 10074 int minTop; 10075 int maxBottom; 10076 int yLoc; 10077 if (offset < 0) { 10078 minTop = mTop + offset; 10079 maxBottom = mBottom; 10080 yLoc = offset; 10081 } else { 10082 minTop = mTop; 10083 maxBottom = mBottom + offset; 10084 yLoc = 0; 10085 } 10086 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 10087 p.invalidateChild(this, r); 10088 } 10089 } 10090 } else { 10091 invalidateViewProperty(false, false); 10092 } 10093 10094 mTop += offset; 10095 mBottom += offset; 10096 if (mDisplayList != null) { 10097 mDisplayList.offsetTopAndBottom(offset); 10098 invalidateViewProperty(false, false); 10099 } else { 10100 if (!matrixIsIdentity) { 10101 invalidateViewProperty(false, true); 10102 } 10103 invalidateParentIfNeeded(); 10104 } 10105 } 10106 } 10107 10108 /** 10109 * Offset this view's horizontal location by the specified amount of pixels. 10110 * 10111 * @param offset the number of pixels to offset the view by 10112 */ 10113 public void offsetLeftAndRight(int offset) { 10114 if (offset != 0) { 10115 updateMatrix(); 10116 final boolean matrixIsIdentity = mTransformationInfo == null 10117 || mTransformationInfo.mMatrixIsIdentity; 10118 if (matrixIsIdentity) { 10119 if (mDisplayList != null) { 10120 invalidateViewProperty(false, false); 10121 } else { 10122 final ViewParent p = mParent; 10123 if (p != null && mAttachInfo != null) { 10124 final Rect r = mAttachInfo.mTmpInvalRect; 10125 int minLeft; 10126 int maxRight; 10127 if (offset < 0) { 10128 minLeft = mLeft + offset; 10129 maxRight = mRight; 10130 } else { 10131 minLeft = mLeft; 10132 maxRight = mRight + offset; 10133 } 10134 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 10135 p.invalidateChild(this, r); 10136 } 10137 } 10138 } else { 10139 invalidateViewProperty(false, false); 10140 } 10141 10142 mLeft += offset; 10143 mRight += offset; 10144 if (mDisplayList != null) { 10145 mDisplayList.offsetLeftAndRight(offset); 10146 invalidateViewProperty(false, false); 10147 } else { 10148 if (!matrixIsIdentity) { 10149 invalidateViewProperty(false, true); 10150 } 10151 invalidateParentIfNeeded(); 10152 } 10153 } 10154 } 10155 10156 /** 10157 * Get the LayoutParams associated with this view. All views should have 10158 * layout parameters. These supply parameters to the <i>parent</i> of this 10159 * view specifying how it should be arranged. There are many subclasses of 10160 * ViewGroup.LayoutParams, and these correspond to the different subclasses 10161 * of ViewGroup that are responsible for arranging their children. 10162 * 10163 * This method may return null if this View is not attached to a parent 10164 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 10165 * was not invoked successfully. When a View is attached to a parent 10166 * ViewGroup, this method must not return null. 10167 * 10168 * @return The LayoutParams associated with this view, or null if no 10169 * parameters have been set yet 10170 */ 10171 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 10172 public ViewGroup.LayoutParams getLayoutParams() { 10173 return mLayoutParams; 10174 } 10175 10176 /** 10177 * Set the layout parameters associated with this view. These supply 10178 * parameters to the <i>parent</i> of this view specifying how it should be 10179 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 10180 * correspond to the different subclasses of ViewGroup that are responsible 10181 * for arranging their children. 10182 * 10183 * @param params The layout parameters for this view, cannot be null 10184 */ 10185 public void setLayoutParams(ViewGroup.LayoutParams params) { 10186 if (params == null) { 10187 throw new NullPointerException("Layout parameters cannot be null"); 10188 } 10189 mLayoutParams = params; 10190 resolveLayoutParams(); 10191 if (mParent instanceof ViewGroup) { 10192 ((ViewGroup) mParent).onSetLayoutParams(this, params); 10193 } 10194 requestLayout(); 10195 } 10196 10197 /** 10198 * Resolve the layout parameters depending on the resolved layout direction 10199 * 10200 * @hide 10201 */ 10202 public void resolveLayoutParams() { 10203 if (mLayoutParams != null) { 10204 mLayoutParams.resolveLayoutDirection(getLayoutDirection()); 10205 } 10206 } 10207 10208 /** 10209 * Set the scrolled position of your view. This will cause a call to 10210 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10211 * invalidated. 10212 * @param x the x position to scroll to 10213 * @param y the y position to scroll to 10214 */ 10215 public void scrollTo(int x, int y) { 10216 if (mScrollX != x || mScrollY != y) { 10217 int oldX = mScrollX; 10218 int oldY = mScrollY; 10219 mScrollX = x; 10220 mScrollY = y; 10221 invalidateParentCaches(); 10222 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10223 if (!awakenScrollBars()) { 10224 postInvalidateOnAnimation(); 10225 } 10226 } 10227 } 10228 10229 /** 10230 * Move the scrolled position of your view. This will cause a call to 10231 * {@link #onScrollChanged(int, int, int, int)} and the view will be 10232 * invalidated. 10233 * @param x the amount of pixels to scroll by horizontally 10234 * @param y the amount of pixels to scroll by vertically 10235 */ 10236 public void scrollBy(int x, int y) { 10237 scrollTo(mScrollX + x, mScrollY + y); 10238 } 10239 10240 /** 10241 * <p>Trigger the scrollbars to draw. When invoked this method starts an 10242 * animation to fade the scrollbars out after a default delay. If a subclass 10243 * provides animated scrolling, the start delay should equal the duration 10244 * of the scrolling animation.</p> 10245 * 10246 * <p>The animation starts only if at least one of the scrollbars is 10247 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 10248 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10249 * this method returns true, and false otherwise. If the animation is 10250 * started, this method calls {@link #invalidate()}; in that case the 10251 * caller should not call {@link #invalidate()}.</p> 10252 * 10253 * <p>This method should be invoked every time a subclass directly updates 10254 * the scroll parameters.</p> 10255 * 10256 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 10257 * and {@link #scrollTo(int, int)}.</p> 10258 * 10259 * @return true if the animation is played, false otherwise 10260 * 10261 * @see #awakenScrollBars(int) 10262 * @see #scrollBy(int, int) 10263 * @see #scrollTo(int, int) 10264 * @see #isHorizontalScrollBarEnabled() 10265 * @see #isVerticalScrollBarEnabled() 10266 * @see #setHorizontalScrollBarEnabled(boolean) 10267 * @see #setVerticalScrollBarEnabled(boolean) 10268 */ 10269 protected boolean awakenScrollBars() { 10270 return mScrollCache != null && 10271 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 10272 } 10273 10274 /** 10275 * Trigger the scrollbars to draw. 10276 * This method differs from awakenScrollBars() only in its default duration. 10277 * initialAwakenScrollBars() will show the scroll bars for longer than 10278 * usual to give the user more of a chance to notice them. 10279 * 10280 * @return true if the animation is played, false otherwise. 10281 */ 10282 private boolean initialAwakenScrollBars() { 10283 return mScrollCache != null && 10284 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 10285 } 10286 10287 /** 10288 * <p> 10289 * Trigger the scrollbars to draw. When invoked this method starts an 10290 * animation to fade the scrollbars out after a fixed delay. If a subclass 10291 * provides animated scrolling, the start delay should equal the duration of 10292 * the scrolling animation. 10293 * </p> 10294 * 10295 * <p> 10296 * The animation starts only if at least one of the scrollbars is enabled, 10297 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10298 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10299 * this method returns true, and false otherwise. If the animation is 10300 * started, this method calls {@link #invalidate()}; in that case the caller 10301 * should not call {@link #invalidate()}. 10302 * </p> 10303 * 10304 * <p> 10305 * This method should be invoked everytime a subclass directly updates the 10306 * scroll parameters. 10307 * </p> 10308 * 10309 * @param startDelay the delay, in milliseconds, after which the animation 10310 * should start; when the delay is 0, the animation starts 10311 * immediately 10312 * @return true if the animation is played, false otherwise 10313 * 10314 * @see #scrollBy(int, int) 10315 * @see #scrollTo(int, int) 10316 * @see #isHorizontalScrollBarEnabled() 10317 * @see #isVerticalScrollBarEnabled() 10318 * @see #setHorizontalScrollBarEnabled(boolean) 10319 * @see #setVerticalScrollBarEnabled(boolean) 10320 */ 10321 protected boolean awakenScrollBars(int startDelay) { 10322 return awakenScrollBars(startDelay, true); 10323 } 10324 10325 /** 10326 * <p> 10327 * Trigger the scrollbars to draw. When invoked this method starts an 10328 * animation to fade the scrollbars out after a fixed delay. If a subclass 10329 * provides animated scrolling, the start delay should equal the duration of 10330 * the scrolling animation. 10331 * </p> 10332 * 10333 * <p> 10334 * The animation starts only if at least one of the scrollbars is enabled, 10335 * as specified by {@link #isHorizontalScrollBarEnabled()} and 10336 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 10337 * this method returns true, and false otherwise. If the animation is 10338 * started, this method calls {@link #invalidate()} if the invalidate parameter 10339 * is set to true; in that case the caller 10340 * should not call {@link #invalidate()}. 10341 * </p> 10342 * 10343 * <p> 10344 * This method should be invoked everytime a subclass directly updates the 10345 * scroll parameters. 10346 * </p> 10347 * 10348 * @param startDelay the delay, in milliseconds, after which the animation 10349 * should start; when the delay is 0, the animation starts 10350 * immediately 10351 * 10352 * @param invalidate Wheter this method should call invalidate 10353 * 10354 * @return true if the animation is played, false otherwise 10355 * 10356 * @see #scrollBy(int, int) 10357 * @see #scrollTo(int, int) 10358 * @see #isHorizontalScrollBarEnabled() 10359 * @see #isVerticalScrollBarEnabled() 10360 * @see #setHorizontalScrollBarEnabled(boolean) 10361 * @see #setVerticalScrollBarEnabled(boolean) 10362 */ 10363 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 10364 final ScrollabilityCache scrollCache = mScrollCache; 10365 10366 if (scrollCache == null || !scrollCache.fadeScrollBars) { 10367 return false; 10368 } 10369 10370 if (scrollCache.scrollBar == null) { 10371 scrollCache.scrollBar = new ScrollBarDrawable(); 10372 } 10373 10374 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 10375 10376 if (invalidate) { 10377 // Invalidate to show the scrollbars 10378 postInvalidateOnAnimation(); 10379 } 10380 10381 if (scrollCache.state == ScrollabilityCache.OFF) { 10382 // FIXME: this is copied from WindowManagerService. 10383 // We should get this value from the system when it 10384 // is possible to do so. 10385 final int KEY_REPEAT_FIRST_DELAY = 750; 10386 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 10387 } 10388 10389 // Tell mScrollCache when we should start fading. This may 10390 // extend the fade start time if one was already scheduled 10391 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 10392 scrollCache.fadeStartTime = fadeStartTime; 10393 scrollCache.state = ScrollabilityCache.ON; 10394 10395 // Schedule our fader to run, unscheduling any old ones first 10396 if (mAttachInfo != null) { 10397 mAttachInfo.mHandler.removeCallbacks(scrollCache); 10398 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 10399 } 10400 10401 return true; 10402 } 10403 10404 return false; 10405 } 10406 10407 /** 10408 * Do not invalidate views which are not visible and which are not running an animation. They 10409 * will not get drawn and they should not set dirty flags as if they will be drawn 10410 */ 10411 private boolean skipInvalidate() { 10412 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 10413 (!(mParent instanceof ViewGroup) || 10414 !((ViewGroup) mParent).isViewTransitioning(this)); 10415 } 10416 /** 10417 * Mark the area defined by dirty as needing to be drawn. If the view is 10418 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 10419 * in the future. This must be called from a UI thread. To call from a non-UI 10420 * thread, call {@link #postInvalidate()}. 10421 * 10422 * WARNING: This method is destructive to dirty. 10423 * @param dirty the rectangle representing the bounds of the dirty region 10424 */ 10425 public void invalidate(Rect dirty) { 10426 if (skipInvalidate()) { 10427 return; 10428 } 10429 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10430 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10431 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10432 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10433 mPrivateFlags |= PFLAG_INVALIDATED; 10434 mPrivateFlags |= PFLAG_DIRTY; 10435 final ViewParent p = mParent; 10436 final AttachInfo ai = mAttachInfo; 10437 //noinspection PointlessBooleanExpression,ConstantConditions 10438 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10439 if (p != null && ai != null && ai.mHardwareAccelerated) { 10440 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10441 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10442 p.invalidateChild(this, null); 10443 return; 10444 } 10445 } 10446 if (p != null && ai != null) { 10447 final int scrollX = mScrollX; 10448 final int scrollY = mScrollY; 10449 final Rect r = ai.mTmpInvalRect; 10450 r.set(dirty.left - scrollX, dirty.top - scrollY, 10451 dirty.right - scrollX, dirty.bottom - scrollY); 10452 mParent.invalidateChild(this, r); 10453 } 10454 } 10455 } 10456 10457 /** 10458 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 10459 * The coordinates of the dirty rect are relative to the view. 10460 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 10461 * will be called at some point in the future. This must be called from 10462 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 10463 * @param l the left position of the dirty region 10464 * @param t the top position of the dirty region 10465 * @param r the right position of the dirty region 10466 * @param b the bottom position of the dirty region 10467 */ 10468 public void invalidate(int l, int t, int r, int b) { 10469 if (skipInvalidate()) { 10470 return; 10471 } 10472 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10473 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID || 10474 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED) { 10475 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10476 mPrivateFlags |= PFLAG_INVALIDATED; 10477 mPrivateFlags |= PFLAG_DIRTY; 10478 final ViewParent p = mParent; 10479 final AttachInfo ai = mAttachInfo; 10480 //noinspection PointlessBooleanExpression,ConstantConditions 10481 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10482 if (p != null && ai != null && ai.mHardwareAccelerated) { 10483 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10484 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10485 p.invalidateChild(this, null); 10486 return; 10487 } 10488 } 10489 if (p != null && ai != null && l < r && t < b) { 10490 final int scrollX = mScrollX; 10491 final int scrollY = mScrollY; 10492 final Rect tmpr = ai.mTmpInvalRect; 10493 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 10494 p.invalidateChild(this, tmpr); 10495 } 10496 } 10497 } 10498 10499 /** 10500 * Invalidate the whole view. If the view is visible, 10501 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 10502 * the future. This must be called from a UI thread. To call from a non-UI thread, 10503 * call {@link #postInvalidate()}. 10504 */ 10505 public void invalidate() { 10506 invalidate(true); 10507 } 10508 10509 /** 10510 * This is where the invalidate() work actually happens. A full invalidate() 10511 * causes the drawing cache to be invalidated, but this function can be called with 10512 * invalidateCache set to false to skip that invalidation step for cases that do not 10513 * need it (for example, a component that remains at the same dimensions with the same 10514 * content). 10515 * 10516 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10517 * well. This is usually true for a full invalidate, but may be set to false if the 10518 * View's contents or dimensions have not changed. 10519 */ 10520 void invalidate(boolean invalidateCache) { 10521 if (skipInvalidate()) { 10522 return; 10523 } 10524 if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_HAS_BOUNDS)) == (PFLAG_DRAWN | PFLAG_HAS_BOUNDS) || 10525 (invalidateCache && (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) || 10526 (mPrivateFlags & PFLAG_INVALIDATED) != PFLAG_INVALIDATED || isOpaque() != mLastIsOpaque) { 10527 mLastIsOpaque = isOpaque(); 10528 mPrivateFlags &= ~PFLAG_DRAWN; 10529 mPrivateFlags |= PFLAG_DIRTY; 10530 if (invalidateCache) { 10531 mPrivateFlags |= PFLAG_INVALIDATED; 10532 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 10533 } 10534 final AttachInfo ai = mAttachInfo; 10535 final ViewParent p = mParent; 10536 //noinspection PointlessBooleanExpression,ConstantConditions 10537 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10538 if (p != null && ai != null && ai.mHardwareAccelerated) { 10539 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10540 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10541 p.invalidateChild(this, null); 10542 return; 10543 } 10544 } 10545 10546 if (p != null && ai != null) { 10547 final Rect r = ai.mTmpInvalRect; 10548 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10549 // Don't call invalidate -- we don't want to internally scroll 10550 // our own bounds 10551 p.invalidateChild(this, r); 10552 } 10553 } 10554 } 10555 10556 /** 10557 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10558 * set any flags or handle all of the cases handled by the default invalidation methods. 10559 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10560 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10561 * walk up the hierarchy, transforming the dirty rect as necessary. 10562 * 10563 * The method also handles normal invalidation logic if display list properties are not 10564 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10565 * backup approach, to handle these cases used in the various property-setting methods. 10566 * 10567 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10568 * are not being used in this view 10569 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10570 * list properties are not being used in this view 10571 */ 10572 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10573 if (mDisplayList == null || (mPrivateFlags & PFLAG_DRAW_ANIMATION) == PFLAG_DRAW_ANIMATION) { 10574 if (invalidateParent) { 10575 invalidateParentCaches(); 10576 } 10577 if (forceRedraw) { 10578 mPrivateFlags |= PFLAG_DRAWN; // force another invalidation with the new orientation 10579 } 10580 invalidate(false); 10581 } else { 10582 final AttachInfo ai = mAttachInfo; 10583 final ViewParent p = mParent; 10584 if (p != null && ai != null) { 10585 final Rect r = ai.mTmpInvalRect; 10586 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10587 if (mParent instanceof ViewGroup) { 10588 ((ViewGroup) mParent).invalidateChildFast(this, r); 10589 } else { 10590 mParent.invalidateChild(this, r); 10591 } 10592 } 10593 } 10594 } 10595 10596 /** 10597 * Utility method to transform a given Rect by the current matrix of this view. 10598 */ 10599 void transformRect(final Rect rect) { 10600 if (!getMatrix().isIdentity()) { 10601 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10602 boundingRect.set(rect); 10603 getMatrix().mapRect(boundingRect); 10604 rect.set((int) (boundingRect.left - 0.5f), 10605 (int) (boundingRect.top - 0.5f), 10606 (int) (boundingRect.right + 0.5f), 10607 (int) (boundingRect.bottom + 0.5f)); 10608 } 10609 } 10610 10611 /** 10612 * Used to indicate that the parent of this view should clear its caches. This functionality 10613 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10614 * which is necessary when various parent-managed properties of the view change, such as 10615 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10616 * clears the parent caches and does not causes an invalidate event. 10617 * 10618 * @hide 10619 */ 10620 protected void invalidateParentCaches() { 10621 if (mParent instanceof View) { 10622 ((View) mParent).mPrivateFlags |= PFLAG_INVALIDATED; 10623 } 10624 } 10625 10626 /** 10627 * Used to indicate that the parent of this view should be invalidated. This functionality 10628 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10629 * which is necessary when various parent-managed properties of the view change, such as 10630 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10631 * an invalidation event to the parent. 10632 * 10633 * @hide 10634 */ 10635 protected void invalidateParentIfNeeded() { 10636 if (isHardwareAccelerated() && mParent instanceof View) { 10637 ((View) mParent).invalidate(true); 10638 } 10639 } 10640 10641 /** 10642 * Indicates whether this View is opaque. An opaque View guarantees that it will 10643 * draw all the pixels overlapping its bounds using a fully opaque color. 10644 * 10645 * Subclasses of View should override this method whenever possible to indicate 10646 * whether an instance is opaque. Opaque Views are treated in a special way by 10647 * the View hierarchy, possibly allowing it to perform optimizations during 10648 * invalidate/draw passes. 10649 * 10650 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10651 */ 10652 @ViewDebug.ExportedProperty(category = "drawing") 10653 public boolean isOpaque() { 10654 return (mPrivateFlags & PFLAG_OPAQUE_MASK) == PFLAG_OPAQUE_MASK && 10655 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1.0f) >= 1.0f); 10656 } 10657 10658 /** 10659 * @hide 10660 */ 10661 protected void computeOpaqueFlags() { 10662 // Opaque if: 10663 // - Has a background 10664 // - Background is opaque 10665 // - Doesn't have scrollbars or scrollbars overlay 10666 10667 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10668 mPrivateFlags |= PFLAG_OPAQUE_BACKGROUND; 10669 } else { 10670 mPrivateFlags &= ~PFLAG_OPAQUE_BACKGROUND; 10671 } 10672 10673 final int flags = mViewFlags; 10674 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10675 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY || 10676 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_OUTSIDE_OVERLAY) { 10677 mPrivateFlags |= PFLAG_OPAQUE_SCROLLBARS; 10678 } else { 10679 mPrivateFlags &= ~PFLAG_OPAQUE_SCROLLBARS; 10680 } 10681 } 10682 10683 /** 10684 * @hide 10685 */ 10686 protected boolean hasOpaqueScrollbars() { 10687 return (mPrivateFlags & PFLAG_OPAQUE_SCROLLBARS) == PFLAG_OPAQUE_SCROLLBARS; 10688 } 10689 10690 /** 10691 * @return A handler associated with the thread running the View. This 10692 * handler can be used to pump events in the UI events queue. 10693 */ 10694 public Handler getHandler() { 10695 if (mAttachInfo != null) { 10696 return mAttachInfo.mHandler; 10697 } 10698 return null; 10699 } 10700 10701 /** 10702 * Gets the view root associated with the View. 10703 * @return The view root, or null if none. 10704 * @hide 10705 */ 10706 public ViewRootImpl getViewRootImpl() { 10707 if (mAttachInfo != null) { 10708 return mAttachInfo.mViewRootImpl; 10709 } 10710 return null; 10711 } 10712 10713 /** 10714 * <p>Causes the Runnable to be added to the message queue. 10715 * The runnable will be run on the user interface thread.</p> 10716 * 10717 * @param action The Runnable that will be executed. 10718 * 10719 * @return Returns true if the Runnable was successfully placed in to the 10720 * message queue. Returns false on failure, usually because the 10721 * looper processing the message queue is exiting. 10722 * 10723 * @see #postDelayed 10724 * @see #removeCallbacks 10725 */ 10726 public boolean post(Runnable action) { 10727 final AttachInfo attachInfo = mAttachInfo; 10728 if (attachInfo != null) { 10729 return attachInfo.mHandler.post(action); 10730 } 10731 // Assume that post will succeed later 10732 ViewRootImpl.getRunQueue().post(action); 10733 return true; 10734 } 10735 10736 /** 10737 * <p>Causes the Runnable to be added to the message queue, to be run 10738 * after the specified amount of time elapses. 10739 * The runnable will be run on the user interface thread.</p> 10740 * 10741 * @param action The Runnable that will be executed. 10742 * @param delayMillis The delay (in milliseconds) until the Runnable 10743 * will be executed. 10744 * 10745 * @return true if the Runnable was successfully placed in to the 10746 * message queue. Returns false on failure, usually because the 10747 * looper processing the message queue is exiting. Note that a 10748 * result of true does not mean the Runnable will be processed -- 10749 * if the looper is quit before the delivery time of the message 10750 * occurs then the message will be dropped. 10751 * 10752 * @see #post 10753 * @see #removeCallbacks 10754 */ 10755 public boolean postDelayed(Runnable action, long delayMillis) { 10756 final AttachInfo attachInfo = mAttachInfo; 10757 if (attachInfo != null) { 10758 return attachInfo.mHandler.postDelayed(action, delayMillis); 10759 } 10760 // Assume that post will succeed later 10761 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10762 return true; 10763 } 10764 10765 /** 10766 * <p>Causes the Runnable to execute on the next animation time step. 10767 * The runnable will be run on the user interface thread.</p> 10768 * 10769 * @param action The Runnable that will be executed. 10770 * 10771 * @see #postOnAnimationDelayed 10772 * @see #removeCallbacks 10773 */ 10774 public void postOnAnimation(Runnable action) { 10775 final AttachInfo attachInfo = mAttachInfo; 10776 if (attachInfo != null) { 10777 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10778 Choreographer.CALLBACK_ANIMATION, action, null); 10779 } else { 10780 // Assume that post will succeed later 10781 ViewRootImpl.getRunQueue().post(action); 10782 } 10783 } 10784 10785 /** 10786 * <p>Causes the Runnable to execute on the next animation time step, 10787 * after the specified amount of time elapses. 10788 * The runnable will be run on the user interface thread.</p> 10789 * 10790 * @param action The Runnable that will be executed. 10791 * @param delayMillis The delay (in milliseconds) until the Runnable 10792 * will be executed. 10793 * 10794 * @see #postOnAnimation 10795 * @see #removeCallbacks 10796 */ 10797 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10798 final AttachInfo attachInfo = mAttachInfo; 10799 if (attachInfo != null) { 10800 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10801 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10802 } else { 10803 // Assume that post will succeed later 10804 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10805 } 10806 } 10807 10808 /** 10809 * <p>Removes the specified Runnable from the message queue.</p> 10810 * 10811 * @param action The Runnable to remove from the message handling queue 10812 * 10813 * @return true if this view could ask the Handler to remove the Runnable, 10814 * false otherwise. When the returned value is true, the Runnable 10815 * may or may not have been actually removed from the message queue 10816 * (for instance, if the Runnable was not in the queue already.) 10817 * 10818 * @see #post 10819 * @see #postDelayed 10820 * @see #postOnAnimation 10821 * @see #postOnAnimationDelayed 10822 */ 10823 public boolean removeCallbacks(Runnable action) { 10824 if (action != null) { 10825 final AttachInfo attachInfo = mAttachInfo; 10826 if (attachInfo != null) { 10827 attachInfo.mHandler.removeCallbacks(action); 10828 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10829 Choreographer.CALLBACK_ANIMATION, action, null); 10830 } else { 10831 // Assume that post will succeed later 10832 ViewRootImpl.getRunQueue().removeCallbacks(action); 10833 } 10834 } 10835 return true; 10836 } 10837 10838 /** 10839 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10840 * Use this to invalidate the View from a non-UI thread.</p> 10841 * 10842 * <p>This method can be invoked from outside of the UI thread 10843 * only when this View is attached to a window.</p> 10844 * 10845 * @see #invalidate() 10846 * @see #postInvalidateDelayed(long) 10847 */ 10848 public void postInvalidate() { 10849 postInvalidateDelayed(0); 10850 } 10851 10852 /** 10853 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10854 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10855 * 10856 * <p>This method can be invoked from outside of the UI thread 10857 * only when this View is attached to a window.</p> 10858 * 10859 * @param left The left coordinate of the rectangle to invalidate. 10860 * @param top The top coordinate of the rectangle to invalidate. 10861 * @param right The right coordinate of the rectangle to invalidate. 10862 * @param bottom The bottom coordinate of the rectangle to invalidate. 10863 * 10864 * @see #invalidate(int, int, int, int) 10865 * @see #invalidate(Rect) 10866 * @see #postInvalidateDelayed(long, int, int, int, int) 10867 */ 10868 public void postInvalidate(int left, int top, int right, int bottom) { 10869 postInvalidateDelayed(0, left, top, right, bottom); 10870 } 10871 10872 /** 10873 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10874 * loop. Waits for the specified amount of time.</p> 10875 * 10876 * <p>This method can be invoked from outside of the UI thread 10877 * only when this View is attached to a window.</p> 10878 * 10879 * @param delayMilliseconds the duration in milliseconds to delay the 10880 * invalidation by 10881 * 10882 * @see #invalidate() 10883 * @see #postInvalidate() 10884 */ 10885 public void postInvalidateDelayed(long delayMilliseconds) { 10886 // We try only with the AttachInfo because there's no point in invalidating 10887 // if we are not attached to our window 10888 final AttachInfo attachInfo = mAttachInfo; 10889 if (attachInfo != null) { 10890 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10891 } 10892 } 10893 10894 /** 10895 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10896 * through the event loop. Waits for the specified amount of time.</p> 10897 * 10898 * <p>This method can be invoked from outside of the UI thread 10899 * only when this View is attached to a window.</p> 10900 * 10901 * @param delayMilliseconds the duration in milliseconds to delay the 10902 * invalidation by 10903 * @param left The left coordinate of the rectangle to invalidate. 10904 * @param top The top coordinate of the rectangle to invalidate. 10905 * @param right The right coordinate of the rectangle to invalidate. 10906 * @param bottom The bottom coordinate of the rectangle to invalidate. 10907 * 10908 * @see #invalidate(int, int, int, int) 10909 * @see #invalidate(Rect) 10910 * @see #postInvalidate(int, int, int, int) 10911 */ 10912 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10913 int right, int bottom) { 10914 10915 // We try only with the AttachInfo because there's no point in invalidating 10916 // if we are not attached to our window 10917 final AttachInfo attachInfo = mAttachInfo; 10918 if (attachInfo != null) { 10919 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 10920 info.target = this; 10921 info.left = left; 10922 info.top = top; 10923 info.right = right; 10924 info.bottom = bottom; 10925 10926 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10927 } 10928 } 10929 10930 /** 10931 * <p>Cause an invalidate to happen on the next animation time step, typically the 10932 * next display frame.</p> 10933 * 10934 * <p>This method can be invoked from outside of the UI thread 10935 * only when this View is attached to a window.</p> 10936 * 10937 * @see #invalidate() 10938 */ 10939 public void postInvalidateOnAnimation() { 10940 // We try only with the AttachInfo because there's no point in invalidating 10941 // if we are not attached to our window 10942 final AttachInfo attachInfo = mAttachInfo; 10943 if (attachInfo != null) { 10944 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10945 } 10946 } 10947 10948 /** 10949 * <p>Cause an invalidate of the specified area to happen on the next animation 10950 * time step, typically the next display frame.</p> 10951 * 10952 * <p>This method can be invoked from outside of the UI thread 10953 * only when this View is attached to a window.</p> 10954 * 10955 * @param left The left coordinate of the rectangle to invalidate. 10956 * @param top The top coordinate of the rectangle to invalidate. 10957 * @param right The right coordinate of the rectangle to invalidate. 10958 * @param bottom The bottom coordinate of the rectangle to invalidate. 10959 * 10960 * @see #invalidate(int, int, int, int) 10961 * @see #invalidate(Rect) 10962 */ 10963 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10964 // We try only with the AttachInfo because there's no point in invalidating 10965 // if we are not attached to our window 10966 final AttachInfo attachInfo = mAttachInfo; 10967 if (attachInfo != null) { 10968 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.obtain(); 10969 info.target = this; 10970 info.left = left; 10971 info.top = top; 10972 info.right = right; 10973 info.bottom = bottom; 10974 10975 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10976 } 10977 } 10978 10979 /** 10980 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10981 * This event is sent at most once every 10982 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10983 */ 10984 private void postSendViewScrolledAccessibilityEventCallback() { 10985 if (mSendViewScrolledAccessibilityEvent == null) { 10986 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10987 } 10988 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10989 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10990 postDelayed(mSendViewScrolledAccessibilityEvent, 10991 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10992 } 10993 } 10994 10995 /** 10996 * Called by a parent to request that a child update its values for mScrollX 10997 * and mScrollY if necessary. This will typically be done if the child is 10998 * animating a scroll using a {@link android.widget.Scroller Scroller} 10999 * object. 11000 */ 11001 public void computeScroll() { 11002 } 11003 11004 /** 11005 * <p>Indicate whether the horizontal edges are faded when the view is 11006 * scrolled horizontally.</p> 11007 * 11008 * @return true if the horizontal edges should are faded on scroll, false 11009 * otherwise 11010 * 11011 * @see #setHorizontalFadingEdgeEnabled(boolean) 11012 * 11013 * @attr ref android.R.styleable#View_requiresFadingEdge 11014 */ 11015 public boolean isHorizontalFadingEdgeEnabled() { 11016 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 11017 } 11018 11019 /** 11020 * <p>Define whether the horizontal edges should be faded when this view 11021 * is scrolled horizontally.</p> 11022 * 11023 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 11024 * be faded when the view is scrolled 11025 * horizontally 11026 * 11027 * @see #isHorizontalFadingEdgeEnabled() 11028 * 11029 * @attr ref android.R.styleable#View_requiresFadingEdge 11030 */ 11031 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 11032 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 11033 if (horizontalFadingEdgeEnabled) { 11034 initScrollCache(); 11035 } 11036 11037 mViewFlags ^= FADING_EDGE_HORIZONTAL; 11038 } 11039 } 11040 11041 /** 11042 * <p>Indicate whether the vertical edges are faded when the view is 11043 * scrolled horizontally.</p> 11044 * 11045 * @return true if the vertical edges should are faded on scroll, false 11046 * otherwise 11047 * 11048 * @see #setVerticalFadingEdgeEnabled(boolean) 11049 * 11050 * @attr ref android.R.styleable#View_requiresFadingEdge 11051 */ 11052 public boolean isVerticalFadingEdgeEnabled() { 11053 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 11054 } 11055 11056 /** 11057 * <p>Define whether the vertical edges should be faded when this view 11058 * is scrolled vertically.</p> 11059 * 11060 * @param verticalFadingEdgeEnabled true if the vertical edges should 11061 * be faded when the view is scrolled 11062 * vertically 11063 * 11064 * @see #isVerticalFadingEdgeEnabled() 11065 * 11066 * @attr ref android.R.styleable#View_requiresFadingEdge 11067 */ 11068 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 11069 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 11070 if (verticalFadingEdgeEnabled) { 11071 initScrollCache(); 11072 } 11073 11074 mViewFlags ^= FADING_EDGE_VERTICAL; 11075 } 11076 } 11077 11078 /** 11079 * Returns the strength, or intensity, of the top faded edge. The strength is 11080 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11081 * returns 0.0 or 1.0 but no value in between. 11082 * 11083 * Subclasses should override this method to provide a smoother fade transition 11084 * when scrolling occurs. 11085 * 11086 * @return the intensity of the top fade as a float between 0.0f and 1.0f 11087 */ 11088 protected float getTopFadingEdgeStrength() { 11089 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 11090 } 11091 11092 /** 11093 * Returns the strength, or intensity, of the bottom faded edge. The strength is 11094 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11095 * returns 0.0 or 1.0 but no value in between. 11096 * 11097 * Subclasses should override this method to provide a smoother fade transition 11098 * when scrolling occurs. 11099 * 11100 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 11101 */ 11102 protected float getBottomFadingEdgeStrength() { 11103 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 11104 computeVerticalScrollRange() ? 1.0f : 0.0f; 11105 } 11106 11107 /** 11108 * Returns the strength, or intensity, of the left faded edge. The strength is 11109 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11110 * returns 0.0 or 1.0 but no value in between. 11111 * 11112 * Subclasses should override this method to provide a smoother fade transition 11113 * when scrolling occurs. 11114 * 11115 * @return the intensity of the left fade as a float between 0.0f and 1.0f 11116 */ 11117 protected float getLeftFadingEdgeStrength() { 11118 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 11119 } 11120 11121 /** 11122 * Returns the strength, or intensity, of the right faded edge. The strength is 11123 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 11124 * returns 0.0 or 1.0 but no value in between. 11125 * 11126 * Subclasses should override this method to provide a smoother fade transition 11127 * when scrolling occurs. 11128 * 11129 * @return the intensity of the right fade as a float between 0.0f and 1.0f 11130 */ 11131 protected float getRightFadingEdgeStrength() { 11132 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 11133 computeHorizontalScrollRange() ? 1.0f : 0.0f; 11134 } 11135 11136 /** 11137 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 11138 * scrollbar is not drawn by default.</p> 11139 * 11140 * @return true if the horizontal scrollbar should be painted, false 11141 * otherwise 11142 * 11143 * @see #setHorizontalScrollBarEnabled(boolean) 11144 */ 11145 public boolean isHorizontalScrollBarEnabled() { 11146 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11147 } 11148 11149 /** 11150 * <p>Define whether the horizontal scrollbar should be drawn or not. The 11151 * scrollbar is not drawn by default.</p> 11152 * 11153 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 11154 * be painted 11155 * 11156 * @see #isHorizontalScrollBarEnabled() 11157 */ 11158 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 11159 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 11160 mViewFlags ^= SCROLLBARS_HORIZONTAL; 11161 computeOpaqueFlags(); 11162 resolvePadding(); 11163 } 11164 } 11165 11166 /** 11167 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 11168 * scrollbar is not drawn by default.</p> 11169 * 11170 * @return true if the vertical scrollbar should be painted, false 11171 * otherwise 11172 * 11173 * @see #setVerticalScrollBarEnabled(boolean) 11174 */ 11175 public boolean isVerticalScrollBarEnabled() { 11176 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 11177 } 11178 11179 /** 11180 * <p>Define whether the vertical scrollbar should be drawn or not. The 11181 * scrollbar is not drawn by default.</p> 11182 * 11183 * @param verticalScrollBarEnabled true if the vertical scrollbar should 11184 * be painted 11185 * 11186 * @see #isVerticalScrollBarEnabled() 11187 */ 11188 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 11189 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 11190 mViewFlags ^= SCROLLBARS_VERTICAL; 11191 computeOpaqueFlags(); 11192 resolvePadding(); 11193 } 11194 } 11195 11196 /** 11197 * @hide 11198 */ 11199 protected void recomputePadding() { 11200 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 11201 } 11202 11203 /** 11204 * Define whether scrollbars will fade when the view is not scrolling. 11205 * 11206 * @param fadeScrollbars wheter to enable fading 11207 * 11208 * @attr ref android.R.styleable#View_fadeScrollbars 11209 */ 11210 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 11211 initScrollCache(); 11212 final ScrollabilityCache scrollabilityCache = mScrollCache; 11213 scrollabilityCache.fadeScrollBars = fadeScrollbars; 11214 if (fadeScrollbars) { 11215 scrollabilityCache.state = ScrollabilityCache.OFF; 11216 } else { 11217 scrollabilityCache.state = ScrollabilityCache.ON; 11218 } 11219 } 11220 11221 /** 11222 * 11223 * Returns true if scrollbars will fade when this view is not scrolling 11224 * 11225 * @return true if scrollbar fading is enabled 11226 * 11227 * @attr ref android.R.styleable#View_fadeScrollbars 11228 */ 11229 public boolean isScrollbarFadingEnabled() { 11230 return mScrollCache != null && mScrollCache.fadeScrollBars; 11231 } 11232 11233 /** 11234 * 11235 * Returns the delay before scrollbars fade. 11236 * 11237 * @return the delay before scrollbars fade 11238 * 11239 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11240 */ 11241 public int getScrollBarDefaultDelayBeforeFade() { 11242 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 11243 mScrollCache.scrollBarDefaultDelayBeforeFade; 11244 } 11245 11246 /** 11247 * Define the delay before scrollbars fade. 11248 * 11249 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 11250 * 11251 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 11252 */ 11253 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 11254 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 11255 } 11256 11257 /** 11258 * 11259 * Returns the scrollbar fade duration. 11260 * 11261 * @return the scrollbar fade duration 11262 * 11263 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11264 */ 11265 public int getScrollBarFadeDuration() { 11266 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 11267 mScrollCache.scrollBarFadeDuration; 11268 } 11269 11270 /** 11271 * Define the scrollbar fade duration. 11272 * 11273 * @param scrollBarFadeDuration - the scrollbar fade duration 11274 * 11275 * @attr ref android.R.styleable#View_scrollbarFadeDuration 11276 */ 11277 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 11278 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 11279 } 11280 11281 /** 11282 * 11283 * Returns the scrollbar size. 11284 * 11285 * @return the scrollbar size 11286 * 11287 * @attr ref android.R.styleable#View_scrollbarSize 11288 */ 11289 public int getScrollBarSize() { 11290 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 11291 mScrollCache.scrollBarSize; 11292 } 11293 11294 /** 11295 * Define the scrollbar size. 11296 * 11297 * @param scrollBarSize - the scrollbar size 11298 * 11299 * @attr ref android.R.styleable#View_scrollbarSize 11300 */ 11301 public void setScrollBarSize(int scrollBarSize) { 11302 getScrollCache().scrollBarSize = scrollBarSize; 11303 } 11304 11305 /** 11306 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 11307 * inset. When inset, they add to the padding of the view. And the scrollbars 11308 * can be drawn inside the padding area or on the edge of the view. For example, 11309 * if a view has a background drawable and you want to draw the scrollbars 11310 * inside the padding specified by the drawable, you can use 11311 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 11312 * appear at the edge of the view, ignoring the padding, then you can use 11313 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 11314 * @param style the style of the scrollbars. Should be one of 11315 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 11316 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 11317 * @see #SCROLLBARS_INSIDE_OVERLAY 11318 * @see #SCROLLBARS_INSIDE_INSET 11319 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11320 * @see #SCROLLBARS_OUTSIDE_INSET 11321 * 11322 * @attr ref android.R.styleable#View_scrollbarStyle 11323 */ 11324 public void setScrollBarStyle(int style) { 11325 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 11326 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 11327 computeOpaqueFlags(); 11328 resolvePadding(); 11329 } 11330 } 11331 11332 /** 11333 * <p>Returns the current scrollbar style.</p> 11334 * @return the current scrollbar style 11335 * @see #SCROLLBARS_INSIDE_OVERLAY 11336 * @see #SCROLLBARS_INSIDE_INSET 11337 * @see #SCROLLBARS_OUTSIDE_OVERLAY 11338 * @see #SCROLLBARS_OUTSIDE_INSET 11339 * 11340 * @attr ref android.R.styleable#View_scrollbarStyle 11341 */ 11342 @ViewDebug.ExportedProperty(mapping = { 11343 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 11344 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 11345 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 11346 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 11347 }) 11348 public int getScrollBarStyle() { 11349 return mViewFlags & SCROLLBARS_STYLE_MASK; 11350 } 11351 11352 /** 11353 * <p>Compute the horizontal range that the horizontal scrollbar 11354 * represents.</p> 11355 * 11356 * <p>The range is expressed in arbitrary units that must be the same as the 11357 * units used by {@link #computeHorizontalScrollExtent()} and 11358 * {@link #computeHorizontalScrollOffset()}.</p> 11359 * 11360 * <p>The default range is the drawing width of this view.</p> 11361 * 11362 * @return the total horizontal range represented by the horizontal 11363 * scrollbar 11364 * 11365 * @see #computeHorizontalScrollExtent() 11366 * @see #computeHorizontalScrollOffset() 11367 * @see android.widget.ScrollBarDrawable 11368 */ 11369 protected int computeHorizontalScrollRange() { 11370 return getWidth(); 11371 } 11372 11373 /** 11374 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 11375 * within the horizontal range. This value is used to compute the position 11376 * of the thumb within the scrollbar's track.</p> 11377 * 11378 * <p>The range is expressed in arbitrary units that must be the same as the 11379 * units used by {@link #computeHorizontalScrollRange()} and 11380 * {@link #computeHorizontalScrollExtent()}.</p> 11381 * 11382 * <p>The default offset is the scroll offset of this view.</p> 11383 * 11384 * @return the horizontal offset of the scrollbar's thumb 11385 * 11386 * @see #computeHorizontalScrollRange() 11387 * @see #computeHorizontalScrollExtent() 11388 * @see android.widget.ScrollBarDrawable 11389 */ 11390 protected int computeHorizontalScrollOffset() { 11391 return mScrollX; 11392 } 11393 11394 /** 11395 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 11396 * within the horizontal range. This value is used to compute the length 11397 * of the thumb within the scrollbar's track.</p> 11398 * 11399 * <p>The range is expressed in arbitrary units that must be the same as the 11400 * units used by {@link #computeHorizontalScrollRange()} and 11401 * {@link #computeHorizontalScrollOffset()}.</p> 11402 * 11403 * <p>The default extent is the drawing width of this view.</p> 11404 * 11405 * @return the horizontal extent of the scrollbar's thumb 11406 * 11407 * @see #computeHorizontalScrollRange() 11408 * @see #computeHorizontalScrollOffset() 11409 * @see android.widget.ScrollBarDrawable 11410 */ 11411 protected int computeHorizontalScrollExtent() { 11412 return getWidth(); 11413 } 11414 11415 /** 11416 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 11417 * 11418 * <p>The range is expressed in arbitrary units that must be the same as the 11419 * units used by {@link #computeVerticalScrollExtent()} and 11420 * {@link #computeVerticalScrollOffset()}.</p> 11421 * 11422 * @return the total vertical range represented by the vertical scrollbar 11423 * 11424 * <p>The default range is the drawing height of this view.</p> 11425 * 11426 * @see #computeVerticalScrollExtent() 11427 * @see #computeVerticalScrollOffset() 11428 * @see android.widget.ScrollBarDrawable 11429 */ 11430 protected int computeVerticalScrollRange() { 11431 return getHeight(); 11432 } 11433 11434 /** 11435 * <p>Compute the vertical offset of the vertical scrollbar's thumb 11436 * within the horizontal range. This value is used to compute the position 11437 * of the thumb within the scrollbar's track.</p> 11438 * 11439 * <p>The range is expressed in arbitrary units that must be the same as the 11440 * units used by {@link #computeVerticalScrollRange()} and 11441 * {@link #computeVerticalScrollExtent()}.</p> 11442 * 11443 * <p>The default offset is the scroll offset of this view.</p> 11444 * 11445 * @return the vertical offset of the scrollbar's thumb 11446 * 11447 * @see #computeVerticalScrollRange() 11448 * @see #computeVerticalScrollExtent() 11449 * @see android.widget.ScrollBarDrawable 11450 */ 11451 protected int computeVerticalScrollOffset() { 11452 return mScrollY; 11453 } 11454 11455 /** 11456 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 11457 * within the vertical range. This value is used to compute the length 11458 * of the thumb within the scrollbar's track.</p> 11459 * 11460 * <p>The range is expressed in arbitrary units that must be the same as the 11461 * units used by {@link #computeVerticalScrollRange()} and 11462 * {@link #computeVerticalScrollOffset()}.</p> 11463 * 11464 * <p>The default extent is the drawing height of this view.</p> 11465 * 11466 * @return the vertical extent of the scrollbar's thumb 11467 * 11468 * @see #computeVerticalScrollRange() 11469 * @see #computeVerticalScrollOffset() 11470 * @see android.widget.ScrollBarDrawable 11471 */ 11472 protected int computeVerticalScrollExtent() { 11473 return getHeight(); 11474 } 11475 11476 /** 11477 * Check if this view can be scrolled horizontally in a certain direction. 11478 * 11479 * @param direction Negative to check scrolling left, positive to check scrolling right. 11480 * @return true if this view can be scrolled in the specified direction, false otherwise. 11481 */ 11482 public boolean canScrollHorizontally(int direction) { 11483 final int offset = computeHorizontalScrollOffset(); 11484 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11485 if (range == 0) return false; 11486 if (direction < 0) { 11487 return offset > 0; 11488 } else { 11489 return offset < range - 1; 11490 } 11491 } 11492 11493 /** 11494 * Check if this view can be scrolled vertically in a certain direction. 11495 * 11496 * @param direction Negative to check scrolling up, positive to check scrolling down. 11497 * @return true if this view can be scrolled in the specified direction, false otherwise. 11498 */ 11499 public boolean canScrollVertically(int direction) { 11500 final int offset = computeVerticalScrollOffset(); 11501 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11502 if (range == 0) return false; 11503 if (direction < 0) { 11504 return offset > 0; 11505 } else { 11506 return offset < range - 1; 11507 } 11508 } 11509 11510 /** 11511 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11512 * scrollbars are painted only if they have been awakened first.</p> 11513 * 11514 * @param canvas the canvas on which to draw the scrollbars 11515 * 11516 * @see #awakenScrollBars(int) 11517 */ 11518 protected final void onDrawScrollBars(Canvas canvas) { 11519 // scrollbars are drawn only when the animation is running 11520 final ScrollabilityCache cache = mScrollCache; 11521 if (cache != null) { 11522 11523 int state = cache.state; 11524 11525 if (state == ScrollabilityCache.OFF) { 11526 return; 11527 } 11528 11529 boolean invalidate = false; 11530 11531 if (state == ScrollabilityCache.FADING) { 11532 // We're fading -- get our fade interpolation 11533 if (cache.interpolatorValues == null) { 11534 cache.interpolatorValues = new float[1]; 11535 } 11536 11537 float[] values = cache.interpolatorValues; 11538 11539 // Stops the animation if we're done 11540 if (cache.scrollBarInterpolator.timeToValues(values) == 11541 Interpolator.Result.FREEZE_END) { 11542 cache.state = ScrollabilityCache.OFF; 11543 } else { 11544 cache.scrollBar.setAlpha(Math.round(values[0])); 11545 } 11546 11547 // This will make the scroll bars inval themselves after 11548 // drawing. We only want this when we're fading so that 11549 // we prevent excessive redraws 11550 invalidate = true; 11551 } else { 11552 // We're just on -- but we may have been fading before so 11553 // reset alpha 11554 cache.scrollBar.setAlpha(255); 11555 } 11556 11557 11558 final int viewFlags = mViewFlags; 11559 11560 final boolean drawHorizontalScrollBar = 11561 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11562 final boolean drawVerticalScrollBar = 11563 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11564 && !isVerticalScrollBarHidden(); 11565 11566 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11567 final int width = mRight - mLeft; 11568 final int height = mBottom - mTop; 11569 11570 final ScrollBarDrawable scrollBar = cache.scrollBar; 11571 11572 final int scrollX = mScrollX; 11573 final int scrollY = mScrollY; 11574 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11575 11576 int left; 11577 int top; 11578 int right; 11579 int bottom; 11580 11581 if (drawHorizontalScrollBar) { 11582 int size = scrollBar.getSize(false); 11583 if (size <= 0) { 11584 size = cache.scrollBarSize; 11585 } 11586 11587 scrollBar.setParameters(computeHorizontalScrollRange(), 11588 computeHorizontalScrollOffset(), 11589 computeHorizontalScrollExtent(), false); 11590 final int verticalScrollBarGap = drawVerticalScrollBar ? 11591 getVerticalScrollbarWidth() : 0; 11592 top = scrollY + height - size - (mUserPaddingBottom & inside); 11593 left = scrollX + (mPaddingLeft & inside); 11594 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11595 bottom = top + size; 11596 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11597 if (invalidate) { 11598 invalidate(left, top, right, bottom); 11599 } 11600 } 11601 11602 if (drawVerticalScrollBar) { 11603 int size = scrollBar.getSize(true); 11604 if (size <= 0) { 11605 size = cache.scrollBarSize; 11606 } 11607 11608 scrollBar.setParameters(computeVerticalScrollRange(), 11609 computeVerticalScrollOffset(), 11610 computeVerticalScrollExtent(), true); 11611 int verticalScrollbarPosition = mVerticalScrollbarPosition; 11612 if (verticalScrollbarPosition == SCROLLBAR_POSITION_DEFAULT) { 11613 verticalScrollbarPosition = isLayoutRtl() ? 11614 SCROLLBAR_POSITION_LEFT : SCROLLBAR_POSITION_RIGHT; 11615 } 11616 switch (verticalScrollbarPosition) { 11617 default: 11618 case SCROLLBAR_POSITION_RIGHT: 11619 left = scrollX + width - size - (mUserPaddingRight & inside); 11620 break; 11621 case SCROLLBAR_POSITION_LEFT: 11622 left = scrollX + (mUserPaddingLeft & inside); 11623 break; 11624 } 11625 top = scrollY + (mPaddingTop & inside); 11626 right = left + size; 11627 bottom = scrollY + height - (mUserPaddingBottom & inside); 11628 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11629 if (invalidate) { 11630 invalidate(left, top, right, bottom); 11631 } 11632 } 11633 } 11634 } 11635 } 11636 11637 /** 11638 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11639 * FastScroller is visible. 11640 * @return whether to temporarily hide the vertical scrollbar 11641 * @hide 11642 */ 11643 protected boolean isVerticalScrollBarHidden() { 11644 return false; 11645 } 11646 11647 /** 11648 * <p>Draw the horizontal scrollbar if 11649 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11650 * 11651 * @param canvas the canvas on which to draw the scrollbar 11652 * @param scrollBar the scrollbar's drawable 11653 * 11654 * @see #isHorizontalScrollBarEnabled() 11655 * @see #computeHorizontalScrollRange() 11656 * @see #computeHorizontalScrollExtent() 11657 * @see #computeHorizontalScrollOffset() 11658 * @see android.widget.ScrollBarDrawable 11659 * @hide 11660 */ 11661 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11662 int l, int t, int r, int b) { 11663 scrollBar.setBounds(l, t, r, b); 11664 scrollBar.draw(canvas); 11665 } 11666 11667 /** 11668 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11669 * returns true.</p> 11670 * 11671 * @param canvas the canvas on which to draw the scrollbar 11672 * @param scrollBar the scrollbar's drawable 11673 * 11674 * @see #isVerticalScrollBarEnabled() 11675 * @see #computeVerticalScrollRange() 11676 * @see #computeVerticalScrollExtent() 11677 * @see #computeVerticalScrollOffset() 11678 * @see android.widget.ScrollBarDrawable 11679 * @hide 11680 */ 11681 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11682 int l, int t, int r, int b) { 11683 scrollBar.setBounds(l, t, r, b); 11684 scrollBar.draw(canvas); 11685 } 11686 11687 /** 11688 * Implement this to do your drawing. 11689 * 11690 * @param canvas the canvas on which the background will be drawn 11691 */ 11692 protected void onDraw(Canvas canvas) { 11693 } 11694 11695 /* 11696 * Caller is responsible for calling requestLayout if necessary. 11697 * (This allows addViewInLayout to not request a new layout.) 11698 */ 11699 void assignParent(ViewParent parent) { 11700 if (mParent == null) { 11701 mParent = parent; 11702 } else if (parent == null) { 11703 mParent = null; 11704 } else { 11705 throw new RuntimeException("view " + this + " being added, but" 11706 + " it already has a parent"); 11707 } 11708 } 11709 11710 /** 11711 * This is called when the view is attached to a window. At this point it 11712 * has a Surface and will start drawing. Note that this function is 11713 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11714 * however it may be called any time before the first onDraw -- including 11715 * before or after {@link #onMeasure(int, int)}. 11716 * 11717 * @see #onDetachedFromWindow() 11718 */ 11719 protected void onAttachedToWindow() { 11720 if ((mPrivateFlags & PFLAG_REQUEST_TRANSPARENT_REGIONS) != 0) { 11721 mParent.requestTransparentRegion(this); 11722 } 11723 11724 if ((mPrivateFlags & PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11725 initialAwakenScrollBars(); 11726 mPrivateFlags &= ~PFLAG_AWAKEN_SCROLL_BARS_ON_ATTACH; 11727 } 11728 11729 jumpDrawablesToCurrentState(); 11730 11731 clearAccessibilityFocus(); 11732 if (isFocused()) { 11733 InputMethodManager imm = InputMethodManager.peekInstance(); 11734 imm.focusIn(this); 11735 } 11736 11737 if (mDisplayList != null) { 11738 mDisplayList.clearDirty(); 11739 } 11740 } 11741 11742 /** 11743 * Resolve all RTL related properties. 11744 * 11745 * @hide 11746 */ 11747 public void resolveRtlPropertiesIfNeeded() { 11748 if (!needRtlPropertiesResolution()) return; 11749 11750 // Order is important here: LayoutDirection MUST be resolved first 11751 if (!isLayoutDirectionResolved()) { 11752 resolveLayoutDirection(); 11753 resolveLayoutParams(); 11754 } 11755 // ... then we can resolve the others properties depending on the resolved LayoutDirection. 11756 if (!isTextDirectionResolved()) { 11757 resolveTextDirection(); 11758 } 11759 if (!isTextAlignmentResolved()) { 11760 resolveTextAlignment(); 11761 } 11762 if (!isPaddingResolved()) { 11763 resolvePadding(); 11764 } 11765 if (!isDrawablesResolved()) { 11766 resolveDrawables(); 11767 } 11768 onRtlPropertiesChanged(getLayoutDirection()); 11769 } 11770 11771 /** 11772 * Reset resolution of all RTL related properties. 11773 * 11774 * @hide 11775 */ 11776 public void resetRtlProperties() { 11777 resetResolvedLayoutDirection(); 11778 resetResolvedTextDirection(); 11779 resetResolvedTextAlignment(); 11780 resetResolvedPadding(); 11781 resetResolvedDrawables(); 11782 } 11783 11784 /** 11785 * @see #onScreenStateChanged(int) 11786 */ 11787 void dispatchScreenStateChanged(int screenState) { 11788 onScreenStateChanged(screenState); 11789 } 11790 11791 /** 11792 * This method is called whenever the state of the screen this view is 11793 * attached to changes. A state change will usually occurs when the screen 11794 * turns on or off (whether it happens automatically or the user does it 11795 * manually.) 11796 * 11797 * @param screenState The new state of the screen. Can be either 11798 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11799 */ 11800 public void onScreenStateChanged(int screenState) { 11801 } 11802 11803 /** 11804 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11805 */ 11806 private boolean hasRtlSupport() { 11807 return mContext.getApplicationInfo().hasRtlSupport(); 11808 } 11809 11810 /** 11811 * Return true if we are in RTL compatibility mode (either before Jelly Bean MR1 or 11812 * RTL not supported) 11813 */ 11814 private boolean isRtlCompatibilityMode() { 11815 final int targetSdkVersion = getContext().getApplicationInfo().targetSdkVersion; 11816 return targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport(); 11817 } 11818 11819 /** 11820 * @return true if RTL properties need resolution. 11821 */ 11822 private boolean needRtlPropertiesResolution() { 11823 return (mPrivateFlags2 & ALL_RTL_PROPERTIES_RESOLVED) != ALL_RTL_PROPERTIES_RESOLVED; 11824 } 11825 11826 /** 11827 * Called when any RTL property (layout direction or text direction or text alignment) has 11828 * been changed. 11829 * 11830 * Subclasses need to override this method to take care of cached information that depends on the 11831 * resolved layout direction, or to inform child views that inherit their layout direction. 11832 * 11833 * The default implementation does nothing. 11834 * 11835 * @param layoutDirection the direction of the layout 11836 * 11837 * @see #LAYOUT_DIRECTION_LTR 11838 * @see #LAYOUT_DIRECTION_RTL 11839 */ 11840 public void onRtlPropertiesChanged(int layoutDirection) { 11841 } 11842 11843 /** 11844 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11845 * that the parent directionality can and will be resolved before its children. 11846 * 11847 * @return true if resolution has been done, false otherwise. 11848 * 11849 * @hide 11850 */ 11851 public boolean resolveLayoutDirection() { 11852 // Clear any previous layout direction resolution 11853 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11854 11855 if (hasRtlSupport()) { 11856 // Set resolved depending on layout direction 11857 switch ((mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_MASK) >> 11858 PFLAG2_LAYOUT_DIRECTION_MASK_SHIFT) { 11859 case LAYOUT_DIRECTION_INHERIT: 11860 // We cannot resolve yet. LTR is by default and let the resolution happen again 11861 // later to get the correct resolved value 11862 if (!canResolveLayoutDirection()) return false; 11863 11864 // Parent has not yet resolved, LTR is still the default 11865 if (!mParent.isLayoutDirectionResolved()) return false; 11866 11867 if (mParent.getLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11868 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11869 } 11870 break; 11871 case LAYOUT_DIRECTION_RTL: 11872 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11873 break; 11874 case LAYOUT_DIRECTION_LOCALE: 11875 if((LAYOUT_DIRECTION_RTL == 11876 TextUtils.getLayoutDirectionFromLocale(Locale.getDefault()))) { 11877 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED_RTL; 11878 } 11879 break; 11880 default: 11881 // Nothing to do, LTR by default 11882 } 11883 } 11884 11885 // Set to resolved 11886 mPrivateFlags2 |= PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11887 return true; 11888 } 11889 11890 /** 11891 * Check if layout direction resolution can be done. 11892 * 11893 * @return true if layout direction resolution can be done otherwise return false. 11894 * 11895 * @hide 11896 */ 11897 public boolean canResolveLayoutDirection() { 11898 switch (getRawLayoutDirection()) { 11899 case LAYOUT_DIRECTION_INHERIT: 11900 return (mParent != null) && mParent.canResolveLayoutDirection(); 11901 default: 11902 return true; 11903 } 11904 } 11905 11906 /** 11907 * Reset the resolved layout direction. Layout direction will be resolved during a call to 11908 * {@link #onMeasure(int, int)}. 11909 * 11910 * @hide 11911 */ 11912 public void resetResolvedLayoutDirection() { 11913 // Reset the current resolved bits 11914 mPrivateFlags2 &= ~PFLAG2_LAYOUT_DIRECTION_RESOLVED_MASK; 11915 } 11916 11917 /** 11918 * @return true if the layout direction is inherited. 11919 * 11920 * @hide 11921 */ 11922 public boolean isLayoutDirectionInherited() { 11923 return (getRawLayoutDirection() == LAYOUT_DIRECTION_INHERIT); 11924 } 11925 11926 /** 11927 * @return true if layout direction has been resolved. 11928 * @hide 11929 */ 11930 public boolean isLayoutDirectionResolved() { 11931 return (mPrivateFlags2 & PFLAG2_LAYOUT_DIRECTION_RESOLVED) == PFLAG2_LAYOUT_DIRECTION_RESOLVED; 11932 } 11933 11934 /** 11935 * Return if padding has been resolved 11936 * 11937 * @hide 11938 */ 11939 boolean isPaddingResolved() { 11940 return (mPrivateFlags2 & PFLAG2_PADDING_RESOLVED) == PFLAG2_PADDING_RESOLVED; 11941 } 11942 11943 /** 11944 * Resolve padding depending on layout direction. 11945 * 11946 * @hide 11947 */ 11948 public void resolvePadding() { 11949 if (!isRtlCompatibilityMode()) { 11950 // Post Jelly Bean MR1 case: we need to take the resolved layout direction into account. 11951 // If start / end padding are defined, they will be resolved (hence overriding) to 11952 // left / right or right / left depending on the resolved layout direction. 11953 // If start / end padding are not defined, use the left / right ones. 11954 int resolvedLayoutDirection = getLayoutDirection(); 11955 // Set user padding to initial values ... 11956 mUserPaddingLeft = mUserPaddingLeftInitial; 11957 mUserPaddingRight = mUserPaddingRightInitial; 11958 // ... then resolve it. 11959 switch (resolvedLayoutDirection) { 11960 case LAYOUT_DIRECTION_RTL: 11961 if (mUserPaddingStart != UNDEFINED_PADDING) { 11962 mUserPaddingRight = mUserPaddingStart; 11963 } 11964 if (mUserPaddingEnd != UNDEFINED_PADDING) { 11965 mUserPaddingLeft = mUserPaddingEnd; 11966 } 11967 break; 11968 case LAYOUT_DIRECTION_LTR: 11969 default: 11970 if (mUserPaddingStart != UNDEFINED_PADDING) { 11971 mUserPaddingLeft = mUserPaddingStart; 11972 } 11973 if (mUserPaddingEnd != UNDEFINED_PADDING) { 11974 mUserPaddingRight = mUserPaddingEnd; 11975 } 11976 } 11977 11978 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11979 11980 internalSetPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, 11981 mUserPaddingBottom); 11982 onRtlPropertiesChanged(resolvedLayoutDirection); 11983 } 11984 11985 mPrivateFlags2 |= PFLAG2_PADDING_RESOLVED; 11986 } 11987 11988 /** 11989 * Reset the resolved layout direction. 11990 * 11991 * @hide 11992 */ 11993 public void resetResolvedPadding() { 11994 mPrivateFlags2 &= ~PFLAG2_PADDING_RESOLVED; 11995 } 11996 11997 /** 11998 * This is called when the view is detached from a window. At this point it 11999 * no longer has a surface for drawing. 12000 * 12001 * @see #onAttachedToWindow() 12002 */ 12003 protected void onDetachedFromWindow() { 12004 mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 12005 12006 removeUnsetPressCallback(); 12007 removeLongPressCallback(); 12008 removePerformClickCallback(); 12009 removeSendViewScrolledAccessibilityEventCallback(); 12010 12011 destroyDrawingCache(); 12012 12013 destroyLayer(false); 12014 12015 if (mAttachInfo != null) { 12016 if (mDisplayList != null) { 12017 mDisplayList.markDirty(); 12018 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 12019 } 12020 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 12021 } else { 12022 // Should never happen 12023 clearDisplayList(); 12024 } 12025 12026 mCurrentAnimation = null; 12027 12028 resetAccessibilityStateChanged(); 12029 } 12030 12031 /** 12032 * @return The number of times this view has been attached to a window 12033 */ 12034 protected int getWindowAttachCount() { 12035 return mWindowAttachCount; 12036 } 12037 12038 /** 12039 * Retrieve a unique token identifying the window this view is attached to. 12040 * @return Return the window's token for use in 12041 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 12042 */ 12043 public IBinder getWindowToken() { 12044 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 12045 } 12046 12047 /** 12048 * Retrieve the {@link WindowId} for the window this view is 12049 * currently attached to. 12050 */ 12051 public WindowId getWindowId() { 12052 if (mAttachInfo == null) { 12053 return null; 12054 } 12055 if (mAttachInfo.mWindowId == null) { 12056 try { 12057 mAttachInfo.mIWindowId = mAttachInfo.mSession.getWindowId( 12058 mAttachInfo.mWindowToken); 12059 mAttachInfo.mWindowId = new WindowId( 12060 mAttachInfo.mIWindowId); 12061 } catch (RemoteException e) { 12062 } 12063 } 12064 return mAttachInfo.mWindowId; 12065 } 12066 12067 /** 12068 * Retrieve a unique token identifying the top-level "real" window of 12069 * the window that this view is attached to. That is, this is like 12070 * {@link #getWindowToken}, except if the window this view in is a panel 12071 * window (attached to another containing window), then the token of 12072 * the containing window is returned instead. 12073 * 12074 * @return Returns the associated window token, either 12075 * {@link #getWindowToken()} or the containing window's token. 12076 */ 12077 public IBinder getApplicationWindowToken() { 12078 AttachInfo ai = mAttachInfo; 12079 if (ai != null) { 12080 IBinder appWindowToken = ai.mPanelParentWindowToken; 12081 if (appWindowToken == null) { 12082 appWindowToken = ai.mWindowToken; 12083 } 12084 return appWindowToken; 12085 } 12086 return null; 12087 } 12088 12089 /** 12090 * Gets the logical display to which the view's window has been attached. 12091 * 12092 * @return The logical display, or null if the view is not currently attached to a window. 12093 */ 12094 public Display getDisplay() { 12095 return mAttachInfo != null ? mAttachInfo.mDisplay : null; 12096 } 12097 12098 /** 12099 * Retrieve private session object this view hierarchy is using to 12100 * communicate with the window manager. 12101 * @return the session object to communicate with the window manager 12102 */ 12103 /*package*/ IWindowSession getWindowSession() { 12104 return mAttachInfo != null ? mAttachInfo.mSession : null; 12105 } 12106 12107 /** 12108 * @param info the {@link android.view.View.AttachInfo} to associated with 12109 * this view 12110 */ 12111 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 12112 //System.out.println("Attached! " + this); 12113 mAttachInfo = info; 12114 if (mOverlay != null) { 12115 mOverlay.getOverlayView().dispatchAttachedToWindow(info, visibility); 12116 } 12117 mWindowAttachCount++; 12118 // We will need to evaluate the drawable state at least once. 12119 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 12120 if (mFloatingTreeObserver != null) { 12121 info.mTreeObserver.merge(mFloatingTreeObserver); 12122 mFloatingTreeObserver = null; 12123 } 12124 if ((mPrivateFlags&PFLAG_SCROLL_CONTAINER) != 0) { 12125 mAttachInfo.mScrollContainers.add(this); 12126 mPrivateFlags |= PFLAG_SCROLL_CONTAINER_ADDED; 12127 } 12128 performCollectViewAttributes(mAttachInfo, visibility); 12129 onAttachedToWindow(); 12130 12131 ListenerInfo li = mListenerInfo; 12132 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12133 li != null ? li.mOnAttachStateChangeListeners : null; 12134 if (listeners != null && listeners.size() > 0) { 12135 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12136 // perform the dispatching. The iterator is a safe guard against listeners that 12137 // could mutate the list by calling the various add/remove methods. This prevents 12138 // the array from being modified while we iterate it. 12139 for (OnAttachStateChangeListener listener : listeners) { 12140 listener.onViewAttachedToWindow(this); 12141 } 12142 } 12143 12144 int vis = info.mWindowVisibility; 12145 if (vis != GONE) { 12146 onWindowVisibilityChanged(vis); 12147 } 12148 if ((mPrivateFlags&PFLAG_DRAWABLE_STATE_DIRTY) != 0) { 12149 // If nobody has evaluated the drawable state yet, then do it now. 12150 refreshDrawableState(); 12151 } 12152 needGlobalAttributesUpdate(false); 12153 } 12154 12155 void dispatchDetachedFromWindow() { 12156 AttachInfo info = mAttachInfo; 12157 if (info != null) { 12158 int vis = info.mWindowVisibility; 12159 if (vis != GONE) { 12160 onWindowVisibilityChanged(GONE); 12161 } 12162 } 12163 12164 onDetachedFromWindow(); 12165 12166 ListenerInfo li = mListenerInfo; 12167 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 12168 li != null ? li.mOnAttachStateChangeListeners : null; 12169 if (listeners != null && listeners.size() > 0) { 12170 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 12171 // perform the dispatching. The iterator is a safe guard against listeners that 12172 // could mutate the list by calling the various add/remove methods. This prevents 12173 // the array from being modified while we iterate it. 12174 for (OnAttachStateChangeListener listener : listeners) { 12175 listener.onViewDetachedFromWindow(this); 12176 } 12177 } 12178 12179 if ((mPrivateFlags & PFLAG_SCROLL_CONTAINER_ADDED) != 0) { 12180 mAttachInfo.mScrollContainers.remove(this); 12181 mPrivateFlags &= ~PFLAG_SCROLL_CONTAINER_ADDED; 12182 } 12183 12184 mAttachInfo = null; 12185 if (mOverlay != null) { 12186 mOverlay.getOverlayView().dispatchDetachedFromWindow(); 12187 } 12188 } 12189 12190 /** 12191 * Store this view hierarchy's frozen state into the given container. 12192 * 12193 * @param container The SparseArray in which to save the view's state. 12194 * 12195 * @see #restoreHierarchyState(android.util.SparseArray) 12196 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12197 * @see #onSaveInstanceState() 12198 */ 12199 public void saveHierarchyState(SparseArray<Parcelable> container) { 12200 dispatchSaveInstanceState(container); 12201 } 12202 12203 /** 12204 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 12205 * this view and its children. May be overridden to modify how freezing happens to a 12206 * view's children; for example, some views may want to not store state for their children. 12207 * 12208 * @param container The SparseArray in which to save the view's state. 12209 * 12210 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12211 * @see #saveHierarchyState(android.util.SparseArray) 12212 * @see #onSaveInstanceState() 12213 */ 12214 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 12215 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 12216 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12217 Parcelable state = onSaveInstanceState(); 12218 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12219 throw new IllegalStateException( 12220 "Derived class did not call super.onSaveInstanceState()"); 12221 } 12222 if (state != null) { 12223 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 12224 // + ": " + state); 12225 container.put(mID, state); 12226 } 12227 } 12228 } 12229 12230 /** 12231 * Hook allowing a view to generate a representation of its internal state 12232 * that can later be used to create a new instance with that same state. 12233 * This state should only contain information that is not persistent or can 12234 * not be reconstructed later. For example, you will never store your 12235 * current position on screen because that will be computed again when a 12236 * new instance of the view is placed in its view hierarchy. 12237 * <p> 12238 * Some examples of things you may store here: the current cursor position 12239 * in a text view (but usually not the text itself since that is stored in a 12240 * content provider or other persistent storage), the currently selected 12241 * item in a list view. 12242 * 12243 * @return Returns a Parcelable object containing the view's current dynamic 12244 * state, or null if there is nothing interesting to save. The 12245 * default implementation returns null. 12246 * @see #onRestoreInstanceState(android.os.Parcelable) 12247 * @see #saveHierarchyState(android.util.SparseArray) 12248 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12249 * @see #setSaveEnabled(boolean) 12250 */ 12251 protected Parcelable onSaveInstanceState() { 12252 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12253 return BaseSavedState.EMPTY_STATE; 12254 } 12255 12256 /** 12257 * Restore this view hierarchy's frozen state from the given container. 12258 * 12259 * @param container The SparseArray which holds previously frozen states. 12260 * 12261 * @see #saveHierarchyState(android.util.SparseArray) 12262 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12263 * @see #onRestoreInstanceState(android.os.Parcelable) 12264 */ 12265 public void restoreHierarchyState(SparseArray<Parcelable> container) { 12266 dispatchRestoreInstanceState(container); 12267 } 12268 12269 /** 12270 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 12271 * state for this view and its children. May be overridden to modify how restoring 12272 * happens to a view's children; for example, some views may want to not store state 12273 * for their children. 12274 * 12275 * @param container The SparseArray which holds previously saved state. 12276 * 12277 * @see #dispatchSaveInstanceState(android.util.SparseArray) 12278 * @see #restoreHierarchyState(android.util.SparseArray) 12279 * @see #onRestoreInstanceState(android.os.Parcelable) 12280 */ 12281 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 12282 if (mID != NO_ID) { 12283 Parcelable state = container.get(mID); 12284 if (state != null) { 12285 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 12286 // + ": " + state); 12287 mPrivateFlags &= ~PFLAG_SAVE_STATE_CALLED; 12288 onRestoreInstanceState(state); 12289 if ((mPrivateFlags & PFLAG_SAVE_STATE_CALLED) == 0) { 12290 throw new IllegalStateException( 12291 "Derived class did not call super.onRestoreInstanceState()"); 12292 } 12293 } 12294 } 12295 } 12296 12297 /** 12298 * Hook allowing a view to re-apply a representation of its internal state that had previously 12299 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 12300 * null state. 12301 * 12302 * @param state The frozen state that had previously been returned by 12303 * {@link #onSaveInstanceState}. 12304 * 12305 * @see #onSaveInstanceState() 12306 * @see #restoreHierarchyState(android.util.SparseArray) 12307 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 12308 */ 12309 protected void onRestoreInstanceState(Parcelable state) { 12310 mPrivateFlags |= PFLAG_SAVE_STATE_CALLED; 12311 if (state != BaseSavedState.EMPTY_STATE && state != null) { 12312 throw new IllegalArgumentException("Wrong state class, expecting View State but " 12313 + "received " + state.getClass().toString() + " instead. This usually happens " 12314 + "when two views of different type have the same id in the same hierarchy. " 12315 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 12316 + "other views do not use the same id."); 12317 } 12318 } 12319 12320 /** 12321 * <p>Return the time at which the drawing of the view hierarchy started.</p> 12322 * 12323 * @return the drawing start time in milliseconds 12324 */ 12325 public long getDrawingTime() { 12326 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 12327 } 12328 12329 /** 12330 * <p>Enables or disables the duplication of the parent's state into this view. When 12331 * duplication is enabled, this view gets its drawable state from its parent rather 12332 * than from its own internal properties.</p> 12333 * 12334 * <p>Note: in the current implementation, setting this property to true after the 12335 * view was added to a ViewGroup might have no effect at all. This property should 12336 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 12337 * 12338 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 12339 * property is enabled, an exception will be thrown.</p> 12340 * 12341 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 12342 * parent, these states should not be affected by this method.</p> 12343 * 12344 * @param enabled True to enable duplication of the parent's drawable state, false 12345 * to disable it. 12346 * 12347 * @see #getDrawableState() 12348 * @see #isDuplicateParentStateEnabled() 12349 */ 12350 public void setDuplicateParentStateEnabled(boolean enabled) { 12351 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 12352 } 12353 12354 /** 12355 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 12356 * 12357 * @return True if this view's drawable state is duplicated from the parent, 12358 * false otherwise 12359 * 12360 * @see #getDrawableState() 12361 * @see #setDuplicateParentStateEnabled(boolean) 12362 */ 12363 public boolean isDuplicateParentStateEnabled() { 12364 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 12365 } 12366 12367 /** 12368 * <p>Specifies the type of layer backing this view. The layer can be 12369 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 12370 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 12371 * 12372 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12373 * instance that controls how the layer is composed on screen. The following 12374 * properties of the paint are taken into account when composing the layer:</p> 12375 * <ul> 12376 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12377 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12378 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12379 * </ul> 12380 * 12381 * <p>If this view has an alpha value set to < 1.0 by calling 12382 * {@link #setAlpha(float)}, the alpha value of the layer's paint is superceded 12383 * by this view's alpha value.</p> 12384 * 12385 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE}, 12386 * {@link #LAYER_TYPE_SOFTWARE} and {@link #LAYER_TYPE_HARDWARE} 12387 * for more information on when and how to use layers.</p> 12388 * 12389 * @param layerType The type of layer to use with this view, must be one of 12390 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12391 * {@link #LAYER_TYPE_HARDWARE} 12392 * @param paint The paint used to compose the layer. This argument is optional 12393 * and can be null. It is ignored when the layer type is 12394 * {@link #LAYER_TYPE_NONE} 12395 * 12396 * @see #getLayerType() 12397 * @see #LAYER_TYPE_NONE 12398 * @see #LAYER_TYPE_SOFTWARE 12399 * @see #LAYER_TYPE_HARDWARE 12400 * @see #setAlpha(float) 12401 * 12402 * @attr ref android.R.styleable#View_layerType 12403 */ 12404 public void setLayerType(int layerType, Paint paint) { 12405 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 12406 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 12407 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 12408 } 12409 12410 if (layerType == mLayerType) { 12411 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 12412 mLayerPaint = paint == null ? new Paint() : paint; 12413 invalidateParentCaches(); 12414 invalidate(true); 12415 } 12416 return; 12417 } 12418 12419 // Destroy any previous software drawing cache if needed 12420 switch (mLayerType) { 12421 case LAYER_TYPE_HARDWARE: 12422 destroyLayer(false); 12423 // fall through - non-accelerated views may use software layer mechanism instead 12424 case LAYER_TYPE_SOFTWARE: 12425 destroyDrawingCache(); 12426 break; 12427 default: 12428 break; 12429 } 12430 12431 mLayerType = layerType; 12432 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 12433 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 12434 mLocalDirtyRect = layerDisabled ? null : new Rect(); 12435 12436 invalidateParentCaches(); 12437 invalidate(true); 12438 } 12439 12440 /** 12441 * Updates the {@link Paint} object used with the current layer (used only if the current 12442 * layer type is not set to {@link #LAYER_TYPE_NONE}). Changed properties of the Paint 12443 * provided to {@link #setLayerType(int, android.graphics.Paint)} will be used the next time 12444 * the View is redrawn, but {@link #setLayerPaint(android.graphics.Paint)} must be called to 12445 * ensure that the view gets redrawn immediately. 12446 * 12447 * <p>A layer is associated with an optional {@link android.graphics.Paint} 12448 * instance that controls how the layer is composed on screen. The following 12449 * properties of the paint are taken into account when composing the layer:</p> 12450 * <ul> 12451 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 12452 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 12453 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 12454 * </ul> 12455 * 12456 * <p>If this view has an alpha value set to < 1.0 by calling {@link #setAlpha(float)}, the 12457 * alpha value of the layer's paint is superceded by this view's alpha value.</p> 12458 * 12459 * @param paint The paint used to compose the layer. This argument is optional 12460 * and can be null. It is ignored when the layer type is 12461 * {@link #LAYER_TYPE_NONE} 12462 * 12463 * @see #setLayerType(int, android.graphics.Paint) 12464 */ 12465 public void setLayerPaint(Paint paint) { 12466 int layerType = getLayerType(); 12467 if (layerType != LAYER_TYPE_NONE) { 12468 mLayerPaint = paint == null ? new Paint() : paint; 12469 if (layerType == LAYER_TYPE_HARDWARE) { 12470 HardwareLayer layer = getHardwareLayer(); 12471 if (layer != null) { 12472 layer.setLayerPaint(paint); 12473 } 12474 invalidateViewProperty(false, false); 12475 } else { 12476 invalidate(); 12477 } 12478 } 12479 } 12480 12481 /** 12482 * Indicates whether this view has a static layer. A view with layer type 12483 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 12484 * dynamic. 12485 */ 12486 boolean hasStaticLayer() { 12487 return true; 12488 } 12489 12490 /** 12491 * Indicates what type of layer is currently associated with this view. By default 12492 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 12493 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 12494 * for more information on the different types of layers. 12495 * 12496 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 12497 * {@link #LAYER_TYPE_HARDWARE} 12498 * 12499 * @see #setLayerType(int, android.graphics.Paint) 12500 * @see #buildLayer() 12501 * @see #LAYER_TYPE_NONE 12502 * @see #LAYER_TYPE_SOFTWARE 12503 * @see #LAYER_TYPE_HARDWARE 12504 */ 12505 public int getLayerType() { 12506 return mLayerType; 12507 } 12508 12509 /** 12510 * Forces this view's layer to be created and this view to be rendered 12511 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 12512 * invoking this method will have no effect. 12513 * 12514 * This method can for instance be used to render a view into its layer before 12515 * starting an animation. If this view is complex, rendering into the layer 12516 * before starting the animation will avoid skipping frames. 12517 * 12518 * @throws IllegalStateException If this view is not attached to a window 12519 * 12520 * @see #setLayerType(int, android.graphics.Paint) 12521 */ 12522 public void buildLayer() { 12523 if (mLayerType == LAYER_TYPE_NONE) return; 12524 12525 if (mAttachInfo == null) { 12526 throw new IllegalStateException("This view must be attached to a window first"); 12527 } 12528 12529 switch (mLayerType) { 12530 case LAYER_TYPE_HARDWARE: 12531 if (mAttachInfo.mHardwareRenderer != null && 12532 mAttachInfo.mHardwareRenderer.isEnabled() && 12533 mAttachInfo.mHardwareRenderer.validate()) { 12534 getHardwareLayer(); 12535 } 12536 break; 12537 case LAYER_TYPE_SOFTWARE: 12538 buildDrawingCache(true); 12539 break; 12540 } 12541 } 12542 12543 /** 12544 * <p>Returns a hardware layer that can be used to draw this view again 12545 * without executing its draw method.</p> 12546 * 12547 * @return A HardwareLayer ready to render, or null if an error occurred. 12548 */ 12549 HardwareLayer getHardwareLayer() { 12550 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 12551 !mAttachInfo.mHardwareRenderer.isEnabled()) { 12552 return null; 12553 } 12554 12555 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 12556 12557 final int width = mRight - mLeft; 12558 final int height = mBottom - mTop; 12559 12560 if (width == 0 || height == 0) { 12561 return null; 12562 } 12563 12564 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 12565 if (mHardwareLayer == null) { 12566 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 12567 width, height, isOpaque()); 12568 mLocalDirtyRect.set(0, 0, width, height); 12569 } else { 12570 if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 12571 if (mHardwareLayer.resize(width, height)) { 12572 mLocalDirtyRect.set(0, 0, width, height); 12573 } 12574 } 12575 12576 // This should not be necessary but applications that change 12577 // the parameters of their background drawable without calling 12578 // this.setBackground(Drawable) can leave the view in a bad state 12579 // (for instance isOpaque() returns true, but the background is 12580 // not opaque.) 12581 computeOpaqueFlags(); 12582 12583 final boolean opaque = isOpaque(); 12584 if (mHardwareLayer.isValid() && mHardwareLayer.isOpaque() != opaque) { 12585 mHardwareLayer.setOpaque(opaque); 12586 mLocalDirtyRect.set(0, 0, width, height); 12587 } 12588 } 12589 12590 // The layer is not valid if the underlying GPU resources cannot be allocated 12591 if (!mHardwareLayer.isValid()) { 12592 return null; 12593 } 12594 12595 mHardwareLayer.setLayerPaint(mLayerPaint); 12596 mHardwareLayer.redrawLater(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 12597 ViewRootImpl viewRoot = getViewRootImpl(); 12598 if (viewRoot != null) viewRoot.pushHardwareLayerUpdate(mHardwareLayer); 12599 12600 mLocalDirtyRect.setEmpty(); 12601 } 12602 12603 return mHardwareLayer; 12604 } 12605 12606 /** 12607 * Destroys this View's hardware layer if possible. 12608 * 12609 * @return True if the layer was destroyed, false otherwise. 12610 * 12611 * @see #setLayerType(int, android.graphics.Paint) 12612 * @see #LAYER_TYPE_HARDWARE 12613 */ 12614 boolean destroyLayer(boolean valid) { 12615 if (mHardwareLayer != null) { 12616 AttachInfo info = mAttachInfo; 12617 if (info != null && info.mHardwareRenderer != null && 12618 info.mHardwareRenderer.isEnabled() && 12619 (valid || info.mHardwareRenderer.validate())) { 12620 mHardwareLayer.destroy(); 12621 mHardwareLayer = null; 12622 12623 if (mDisplayList != null) { 12624 mDisplayList.reset(); 12625 } 12626 invalidate(true); 12627 invalidateParentCaches(); 12628 } 12629 return true; 12630 } 12631 return false; 12632 } 12633 12634 /** 12635 * Destroys all hardware rendering resources. This method is invoked 12636 * when the system needs to reclaim resources. Upon execution of this 12637 * method, you should free any OpenGL resources created by the view. 12638 * 12639 * Note: you <strong>must</strong> call 12640 * <code>super.destroyHardwareResources()</code> when overriding 12641 * this method. 12642 * 12643 * @hide 12644 */ 12645 protected void destroyHardwareResources() { 12646 destroyLayer(true); 12647 } 12648 12649 /** 12650 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12651 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12652 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12653 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12654 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12655 * null.</p> 12656 * 12657 * <p>Enabling the drawing cache is similar to 12658 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12659 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12660 * drawing cache has no effect on rendering because the system uses a different mechanism 12661 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12662 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12663 * for information on how to enable software and hardware layers.</p> 12664 * 12665 * <p>This API can be used to manually generate 12666 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12667 * {@link #getDrawingCache()}.</p> 12668 * 12669 * @param enabled true to enable the drawing cache, false otherwise 12670 * 12671 * @see #isDrawingCacheEnabled() 12672 * @see #getDrawingCache() 12673 * @see #buildDrawingCache() 12674 * @see #setLayerType(int, android.graphics.Paint) 12675 */ 12676 public void setDrawingCacheEnabled(boolean enabled) { 12677 mCachingFailed = false; 12678 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12679 } 12680 12681 /** 12682 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12683 * 12684 * @return true if the drawing cache is enabled 12685 * 12686 * @see #setDrawingCacheEnabled(boolean) 12687 * @see #getDrawingCache() 12688 */ 12689 @ViewDebug.ExportedProperty(category = "drawing") 12690 public boolean isDrawingCacheEnabled() { 12691 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12692 } 12693 12694 /** 12695 * Debugging utility which recursively outputs the dirty state of a view and its 12696 * descendants. 12697 * 12698 * @hide 12699 */ 12700 @SuppressWarnings({"UnusedDeclaration"}) 12701 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12702 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.PFLAG_DIRTY_MASK) + 12703 ") DRAWN(" + (mPrivateFlags & PFLAG_DRAWN) + ")" + " CACHE_VALID(" + 12704 (mPrivateFlags & View.PFLAG_DRAWING_CACHE_VALID) + 12705 ") INVALIDATED(" + (mPrivateFlags & PFLAG_INVALIDATED) + ")"); 12706 if (clear) { 12707 mPrivateFlags &= clearMask; 12708 } 12709 if (this instanceof ViewGroup) { 12710 ViewGroup parent = (ViewGroup) this; 12711 final int count = parent.getChildCount(); 12712 for (int i = 0; i < count; i++) { 12713 final View child = parent.getChildAt(i); 12714 child.outputDirtyFlags(indent + " ", clear, clearMask); 12715 } 12716 } 12717 } 12718 12719 /** 12720 * This method is used by ViewGroup to cause its children to restore or recreate their 12721 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12722 * to recreate its own display list, which would happen if it went through the normal 12723 * draw/dispatchDraw mechanisms. 12724 * 12725 * @hide 12726 */ 12727 protected void dispatchGetDisplayList() {} 12728 12729 /** 12730 * A view that is not attached or hardware accelerated cannot create a display list. 12731 * This method checks these conditions and returns the appropriate result. 12732 * 12733 * @return true if view has the ability to create a display list, false otherwise. 12734 * 12735 * @hide 12736 */ 12737 public boolean canHaveDisplayList() { 12738 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12739 } 12740 12741 /** 12742 * @return The {@link HardwareRenderer} associated with that view or null if 12743 * hardware rendering is not supported or this view is not attached 12744 * to a window. 12745 * 12746 * @hide 12747 */ 12748 public HardwareRenderer getHardwareRenderer() { 12749 if (mAttachInfo != null) { 12750 return mAttachInfo.mHardwareRenderer; 12751 } 12752 return null; 12753 } 12754 12755 /** 12756 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12757 * Otherwise, the same display list will be returned (after having been rendered into 12758 * along the way, depending on the invalidation state of the view). 12759 * 12760 * @param displayList The previous version of this displayList, could be null. 12761 * @param isLayer Whether the requester of the display list is a layer. If so, 12762 * the view will avoid creating a layer inside the resulting display list. 12763 * @return A new or reused DisplayList object. 12764 */ 12765 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12766 if (!canHaveDisplayList()) { 12767 return null; 12768 } 12769 12770 if (((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || 12771 displayList == null || !displayList.isValid() || 12772 (!isLayer && mRecreateDisplayList))) { 12773 // Don't need to recreate the display list, just need to tell our 12774 // children to restore/recreate theirs 12775 if (displayList != null && displayList.isValid() && 12776 !isLayer && !mRecreateDisplayList) { 12777 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12778 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12779 dispatchGetDisplayList(); 12780 12781 return displayList; 12782 } 12783 12784 if (!isLayer) { 12785 // If we got here, we're recreating it. Mark it as such to ensure that 12786 // we copy in child display lists into ours in drawChild() 12787 mRecreateDisplayList = true; 12788 } 12789 if (displayList == null) { 12790 final String name = getClass().getSimpleName(); 12791 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12792 // If we're creating a new display list, make sure our parent gets invalidated 12793 // since they will need to recreate their display list to account for this 12794 // new child display list. 12795 invalidateParentCaches(); 12796 } 12797 12798 boolean caching = false; 12799 int width = mRight - mLeft; 12800 int height = mBottom - mTop; 12801 int layerType = getLayerType(); 12802 12803 final HardwareCanvas canvas = displayList.start(width, height); 12804 12805 try { 12806 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12807 if (layerType == LAYER_TYPE_HARDWARE) { 12808 final HardwareLayer layer = getHardwareLayer(); 12809 if (layer != null && layer.isValid()) { 12810 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12811 } else { 12812 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12813 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12814 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12815 } 12816 caching = true; 12817 } else { 12818 buildDrawingCache(true); 12819 Bitmap cache = getDrawingCache(true); 12820 if (cache != null) { 12821 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12822 caching = true; 12823 } 12824 } 12825 } else { 12826 12827 computeScroll(); 12828 12829 canvas.translate(-mScrollX, -mScrollY); 12830 if (!isLayer) { 12831 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12832 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12833 } 12834 12835 // Fast path for layouts with no backgrounds 12836 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 12837 dispatchDraw(canvas); 12838 if (mOverlay != null && !mOverlay.isEmpty()) { 12839 mOverlay.getOverlayView().draw(canvas); 12840 } 12841 } else { 12842 draw(canvas); 12843 } 12844 } 12845 } finally { 12846 displayList.end(); 12847 displayList.setCaching(caching); 12848 if (isLayer) { 12849 displayList.setLeftTopRightBottom(0, 0, width, height); 12850 } else { 12851 setDisplayListProperties(displayList); 12852 } 12853 } 12854 } else if (!isLayer) { 12855 mPrivateFlags |= PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID; 12856 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 12857 } 12858 12859 return displayList; 12860 } 12861 12862 /** 12863 * Get the DisplayList for the HardwareLayer 12864 * 12865 * @param layer The HardwareLayer whose DisplayList we want 12866 * @return A DisplayList fopr the specified HardwareLayer 12867 */ 12868 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12869 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12870 layer.setDisplayList(displayList); 12871 return displayList; 12872 } 12873 12874 12875 /** 12876 * <p>Returns a display list that can be used to draw this view again 12877 * without executing its draw method.</p> 12878 * 12879 * @return A DisplayList ready to replay, or null if caching is not enabled. 12880 * 12881 * @hide 12882 */ 12883 public DisplayList getDisplayList() { 12884 mDisplayList = getDisplayList(mDisplayList, false); 12885 return mDisplayList; 12886 } 12887 12888 private void clearDisplayList() { 12889 if (mDisplayList != null) { 12890 mDisplayList.clear(); 12891 } 12892 } 12893 12894 /** 12895 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12896 * 12897 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12898 * 12899 * @see #getDrawingCache(boolean) 12900 */ 12901 public Bitmap getDrawingCache() { 12902 return getDrawingCache(false); 12903 } 12904 12905 /** 12906 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12907 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12908 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12909 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12910 * request the drawing cache by calling this method and draw it on screen if the 12911 * returned bitmap is not null.</p> 12912 * 12913 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12914 * this method will create a bitmap of the same size as this view. Because this bitmap 12915 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12916 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12917 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12918 * size than the view. This implies that your application must be able to handle this 12919 * size.</p> 12920 * 12921 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12922 * the current density of the screen when the application is in compatibility 12923 * mode. 12924 * 12925 * @return A bitmap representing this view or null if cache is disabled. 12926 * 12927 * @see #setDrawingCacheEnabled(boolean) 12928 * @see #isDrawingCacheEnabled() 12929 * @see #buildDrawingCache(boolean) 12930 * @see #destroyDrawingCache() 12931 */ 12932 public Bitmap getDrawingCache(boolean autoScale) { 12933 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12934 return null; 12935 } 12936 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12937 buildDrawingCache(autoScale); 12938 } 12939 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12940 } 12941 12942 /** 12943 * <p>Frees the resources used by the drawing cache. If you call 12944 * {@link #buildDrawingCache()} manually without calling 12945 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12946 * should cleanup the cache with this method afterwards.</p> 12947 * 12948 * @see #setDrawingCacheEnabled(boolean) 12949 * @see #buildDrawingCache() 12950 * @see #getDrawingCache() 12951 */ 12952 public void destroyDrawingCache() { 12953 if (mDrawingCache != null) { 12954 mDrawingCache.recycle(); 12955 mDrawingCache = null; 12956 } 12957 if (mUnscaledDrawingCache != null) { 12958 mUnscaledDrawingCache.recycle(); 12959 mUnscaledDrawingCache = null; 12960 } 12961 } 12962 12963 /** 12964 * Setting a solid background color for the drawing cache's bitmaps will improve 12965 * performance and memory usage. Note, though that this should only be used if this 12966 * view will always be drawn on top of a solid color. 12967 * 12968 * @param color The background color to use for the drawing cache's bitmap 12969 * 12970 * @see #setDrawingCacheEnabled(boolean) 12971 * @see #buildDrawingCache() 12972 * @see #getDrawingCache() 12973 */ 12974 public void setDrawingCacheBackgroundColor(int color) { 12975 if (color != mDrawingCacheBackgroundColor) { 12976 mDrawingCacheBackgroundColor = color; 12977 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 12978 } 12979 } 12980 12981 /** 12982 * @see #setDrawingCacheBackgroundColor(int) 12983 * 12984 * @return The background color to used for the drawing cache's bitmap 12985 */ 12986 public int getDrawingCacheBackgroundColor() { 12987 return mDrawingCacheBackgroundColor; 12988 } 12989 12990 /** 12991 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12992 * 12993 * @see #buildDrawingCache(boolean) 12994 */ 12995 public void buildDrawingCache() { 12996 buildDrawingCache(false); 12997 } 12998 12999 /** 13000 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 13001 * 13002 * <p>If you call {@link #buildDrawingCache()} manually without calling 13003 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 13004 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 13005 * 13006 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 13007 * this method will create a bitmap of the same size as this view. Because this bitmap 13008 * will be drawn scaled by the parent ViewGroup, the result on screen might show 13009 * scaling artifacts. To avoid such artifacts, you should call this method by setting 13010 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 13011 * size than the view. This implies that your application must be able to handle this 13012 * size.</p> 13013 * 13014 * <p>You should avoid calling this method when hardware acceleration is enabled. If 13015 * you do not need the drawing cache bitmap, calling this method will increase memory 13016 * usage and cause the view to be rendered in software once, thus negatively impacting 13017 * performance.</p> 13018 * 13019 * @see #getDrawingCache() 13020 * @see #destroyDrawingCache() 13021 */ 13022 public void buildDrawingCache(boolean autoScale) { 13023 if ((mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == 0 || (autoScale ? 13024 mDrawingCache == null : mUnscaledDrawingCache == null)) { 13025 mCachingFailed = false; 13026 13027 int width = mRight - mLeft; 13028 int height = mBottom - mTop; 13029 13030 final AttachInfo attachInfo = mAttachInfo; 13031 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 13032 13033 if (autoScale && scalingRequired) { 13034 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 13035 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 13036 } 13037 13038 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 13039 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 13040 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 13041 13042 final long projectedBitmapSize = width * height * (opaque && !use32BitCache ? 2 : 4); 13043 final long drawingCacheSize = 13044 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize(); 13045 if (width <= 0 || height <= 0 || projectedBitmapSize > drawingCacheSize) { 13046 if (width > 0 && height > 0) { 13047 Log.w(VIEW_LOG_TAG, "View too large to fit into drawing cache, needs " 13048 + projectedBitmapSize + " bytes, only " 13049 + drawingCacheSize + " available"); 13050 } 13051 destroyDrawingCache(); 13052 mCachingFailed = true; 13053 return; 13054 } 13055 13056 boolean clear = true; 13057 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 13058 13059 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 13060 Bitmap.Config quality; 13061 if (!opaque) { 13062 // Never pick ARGB_4444 because it looks awful 13063 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 13064 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 13065 case DRAWING_CACHE_QUALITY_AUTO: 13066 quality = Bitmap.Config.ARGB_8888; 13067 break; 13068 case DRAWING_CACHE_QUALITY_LOW: 13069 quality = Bitmap.Config.ARGB_8888; 13070 break; 13071 case DRAWING_CACHE_QUALITY_HIGH: 13072 quality = Bitmap.Config.ARGB_8888; 13073 break; 13074 default: 13075 quality = Bitmap.Config.ARGB_8888; 13076 break; 13077 } 13078 } else { 13079 // Optimization for translucent windows 13080 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 13081 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 13082 } 13083 13084 // Try to cleanup memory 13085 if (bitmap != null) bitmap.recycle(); 13086 13087 try { 13088 bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13089 width, height, quality); 13090 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 13091 if (autoScale) { 13092 mDrawingCache = bitmap; 13093 } else { 13094 mUnscaledDrawingCache = bitmap; 13095 } 13096 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 13097 } catch (OutOfMemoryError e) { 13098 // If there is not enough memory to create the bitmap cache, just 13099 // ignore the issue as bitmap caches are not required to draw the 13100 // view hierarchy 13101 if (autoScale) { 13102 mDrawingCache = null; 13103 } else { 13104 mUnscaledDrawingCache = null; 13105 } 13106 mCachingFailed = true; 13107 return; 13108 } 13109 13110 clear = drawingCacheBackgroundColor != 0; 13111 } 13112 13113 Canvas canvas; 13114 if (attachInfo != null) { 13115 canvas = attachInfo.mCanvas; 13116 if (canvas == null) { 13117 canvas = new Canvas(); 13118 } 13119 canvas.setBitmap(bitmap); 13120 // Temporarily clobber the cached Canvas in case one of our children 13121 // is also using a drawing cache. Without this, the children would 13122 // steal the canvas by attaching their own bitmap to it and bad, bad 13123 // thing would happen (invisible views, corrupted drawings, etc.) 13124 attachInfo.mCanvas = null; 13125 } else { 13126 // This case should hopefully never or seldom happen 13127 canvas = new Canvas(bitmap); 13128 } 13129 13130 if (clear) { 13131 bitmap.eraseColor(drawingCacheBackgroundColor); 13132 } 13133 13134 computeScroll(); 13135 final int restoreCount = canvas.save(); 13136 13137 if (autoScale && scalingRequired) { 13138 final float scale = attachInfo.mApplicationScale; 13139 canvas.scale(scale, scale); 13140 } 13141 13142 canvas.translate(-mScrollX, -mScrollY); 13143 13144 mPrivateFlags |= PFLAG_DRAWN; 13145 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 13146 mLayerType != LAYER_TYPE_NONE) { 13147 mPrivateFlags |= PFLAG_DRAWING_CACHE_VALID; 13148 } 13149 13150 // Fast path for layouts with no backgrounds 13151 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13152 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13153 dispatchDraw(canvas); 13154 if (mOverlay != null && !mOverlay.isEmpty()) { 13155 mOverlay.getOverlayView().draw(canvas); 13156 } 13157 } else { 13158 draw(canvas); 13159 } 13160 13161 canvas.restoreToCount(restoreCount); 13162 canvas.setBitmap(null); 13163 13164 if (attachInfo != null) { 13165 // Restore the cached Canvas for our siblings 13166 attachInfo.mCanvas = canvas; 13167 } 13168 } 13169 } 13170 13171 /** 13172 * Create a snapshot of the view into a bitmap. We should probably make 13173 * some form of this public, but should think about the API. 13174 */ 13175 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 13176 int width = mRight - mLeft; 13177 int height = mBottom - mTop; 13178 13179 final AttachInfo attachInfo = mAttachInfo; 13180 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 13181 width = (int) ((width * scale) + 0.5f); 13182 height = (int) ((height * scale) + 0.5f); 13183 13184 Bitmap bitmap = Bitmap.createBitmap(mResources.getDisplayMetrics(), 13185 width > 0 ? width : 1, height > 0 ? height : 1, quality); 13186 if (bitmap == null) { 13187 throw new OutOfMemoryError(); 13188 } 13189 13190 Resources resources = getResources(); 13191 if (resources != null) { 13192 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 13193 } 13194 13195 Canvas canvas; 13196 if (attachInfo != null) { 13197 canvas = attachInfo.mCanvas; 13198 if (canvas == null) { 13199 canvas = new Canvas(); 13200 } 13201 canvas.setBitmap(bitmap); 13202 // Temporarily clobber the cached Canvas in case one of our children 13203 // is also using a drawing cache. Without this, the children would 13204 // steal the canvas by attaching their own bitmap to it and bad, bad 13205 // things would happen (invisible views, corrupted drawings, etc.) 13206 attachInfo.mCanvas = null; 13207 } else { 13208 // This case should hopefully never or seldom happen 13209 canvas = new Canvas(bitmap); 13210 } 13211 13212 if ((backgroundColor & 0xff000000) != 0) { 13213 bitmap.eraseColor(backgroundColor); 13214 } 13215 13216 computeScroll(); 13217 final int restoreCount = canvas.save(); 13218 canvas.scale(scale, scale); 13219 canvas.translate(-mScrollX, -mScrollY); 13220 13221 // Temporarily remove the dirty mask 13222 int flags = mPrivateFlags; 13223 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13224 13225 // Fast path for layouts with no backgrounds 13226 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13227 dispatchDraw(canvas); 13228 } else { 13229 draw(canvas); 13230 } 13231 13232 mPrivateFlags = flags; 13233 13234 canvas.restoreToCount(restoreCount); 13235 canvas.setBitmap(null); 13236 13237 if (attachInfo != null) { 13238 // Restore the cached Canvas for our siblings 13239 attachInfo.mCanvas = canvas; 13240 } 13241 13242 return bitmap; 13243 } 13244 13245 /** 13246 * Indicates whether this View is currently in edit mode. A View is usually 13247 * in edit mode when displayed within a developer tool. For instance, if 13248 * this View is being drawn by a visual user interface builder, this method 13249 * should return true. 13250 * 13251 * Subclasses should check the return value of this method to provide 13252 * different behaviors if their normal behavior might interfere with the 13253 * host environment. For instance: the class spawns a thread in its 13254 * constructor, the drawing code relies on device-specific features, etc. 13255 * 13256 * This method is usually checked in the drawing code of custom widgets. 13257 * 13258 * @return True if this View is in edit mode, false otherwise. 13259 */ 13260 public boolean isInEditMode() { 13261 return false; 13262 } 13263 13264 /** 13265 * If the View draws content inside its padding and enables fading edges, 13266 * it needs to support padding offsets. Padding offsets are added to the 13267 * fading edges to extend the length of the fade so that it covers pixels 13268 * drawn inside the padding. 13269 * 13270 * Subclasses of this class should override this method if they need 13271 * to draw content inside the padding. 13272 * 13273 * @return True if padding offset must be applied, false otherwise. 13274 * 13275 * @see #getLeftPaddingOffset() 13276 * @see #getRightPaddingOffset() 13277 * @see #getTopPaddingOffset() 13278 * @see #getBottomPaddingOffset() 13279 * 13280 * @since CURRENT 13281 */ 13282 protected boolean isPaddingOffsetRequired() { 13283 return false; 13284 } 13285 13286 /** 13287 * Amount by which to extend the left fading region. Called only when 13288 * {@link #isPaddingOffsetRequired()} returns true. 13289 * 13290 * @return The left padding offset in pixels. 13291 * 13292 * @see #isPaddingOffsetRequired() 13293 * 13294 * @since CURRENT 13295 */ 13296 protected int getLeftPaddingOffset() { 13297 return 0; 13298 } 13299 13300 /** 13301 * Amount by which to extend the right fading region. Called only when 13302 * {@link #isPaddingOffsetRequired()} returns true. 13303 * 13304 * @return The right padding offset in pixels. 13305 * 13306 * @see #isPaddingOffsetRequired() 13307 * 13308 * @since CURRENT 13309 */ 13310 protected int getRightPaddingOffset() { 13311 return 0; 13312 } 13313 13314 /** 13315 * Amount by which to extend the top fading region. Called only when 13316 * {@link #isPaddingOffsetRequired()} returns true. 13317 * 13318 * @return The top padding offset in pixels. 13319 * 13320 * @see #isPaddingOffsetRequired() 13321 * 13322 * @since CURRENT 13323 */ 13324 protected int getTopPaddingOffset() { 13325 return 0; 13326 } 13327 13328 /** 13329 * Amount by which to extend the bottom fading region. Called only when 13330 * {@link #isPaddingOffsetRequired()} returns true. 13331 * 13332 * @return The bottom padding offset in pixels. 13333 * 13334 * @see #isPaddingOffsetRequired() 13335 * 13336 * @since CURRENT 13337 */ 13338 protected int getBottomPaddingOffset() { 13339 return 0; 13340 } 13341 13342 /** 13343 * @hide 13344 * @param offsetRequired 13345 */ 13346 protected int getFadeTop(boolean offsetRequired) { 13347 int top = mPaddingTop; 13348 if (offsetRequired) top += getTopPaddingOffset(); 13349 return top; 13350 } 13351 13352 /** 13353 * @hide 13354 * @param offsetRequired 13355 */ 13356 protected int getFadeHeight(boolean offsetRequired) { 13357 int padding = mPaddingTop; 13358 if (offsetRequired) padding += getTopPaddingOffset(); 13359 return mBottom - mTop - mPaddingBottom - padding; 13360 } 13361 13362 /** 13363 * <p>Indicates whether this view is attached to a hardware accelerated 13364 * window or not.</p> 13365 * 13366 * <p>Even if this method returns true, it does not mean that every call 13367 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 13368 * accelerated {@link android.graphics.Canvas}. For instance, if this view 13369 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 13370 * window is hardware accelerated, 13371 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 13372 * return false, and this method will return true.</p> 13373 * 13374 * @return True if the view is attached to a window and the window is 13375 * hardware accelerated; false in any other case. 13376 */ 13377 public boolean isHardwareAccelerated() { 13378 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13379 } 13380 13381 /** 13382 * Sets a rectangular area on this view to which the view will be clipped 13383 * when it is drawn. Setting the value to null will remove the clip bounds 13384 * and the view will draw normally, using its full bounds. 13385 * 13386 * @param clipBounds The rectangular area, in the local coordinates of 13387 * this view, to which future drawing operations will be clipped. 13388 */ 13389 public void setClipBounds(Rect clipBounds) { 13390 if (clipBounds != null) { 13391 if (clipBounds.equals(mClipBounds)) { 13392 return; 13393 } 13394 if (mClipBounds == null) { 13395 invalidate(); 13396 mClipBounds = new Rect(clipBounds); 13397 } else { 13398 invalidate(Math.min(mClipBounds.left, clipBounds.left), 13399 Math.min(mClipBounds.top, clipBounds.top), 13400 Math.max(mClipBounds.right, clipBounds.right), 13401 Math.max(mClipBounds.bottom, clipBounds.bottom)); 13402 mClipBounds.set(clipBounds); 13403 } 13404 } else { 13405 if (mClipBounds != null) { 13406 invalidate(); 13407 mClipBounds = null; 13408 } 13409 } 13410 } 13411 13412 /** 13413 * Returns a copy of the current {@link #setClipBounds(Rect) clipBounds}. 13414 * 13415 * @return A copy of the current clip bounds if clip bounds are set, 13416 * otherwise null. 13417 */ 13418 public Rect getClipBounds() { 13419 return (mClipBounds != null) ? new Rect(mClipBounds) : null; 13420 } 13421 13422 /** 13423 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 13424 * case of an active Animation being run on the view. 13425 */ 13426 private boolean drawAnimation(ViewGroup parent, long drawingTime, 13427 Animation a, boolean scalingRequired) { 13428 Transformation invalidationTransform; 13429 final int flags = parent.mGroupFlags; 13430 final boolean initialized = a.isInitialized(); 13431 if (!initialized) { 13432 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 13433 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 13434 if (mAttachInfo != null) a.setListenerHandler(mAttachInfo.mHandler); 13435 onAnimationStart(); 13436 } 13437 13438 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 13439 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 13440 if (parent.mInvalidationTransformation == null) { 13441 parent.mInvalidationTransformation = new Transformation(); 13442 } 13443 invalidationTransform = parent.mInvalidationTransformation; 13444 a.getTransformation(drawingTime, invalidationTransform, 1f); 13445 } else { 13446 invalidationTransform = parent.mChildTransformation; 13447 } 13448 13449 if (more) { 13450 if (!a.willChangeBounds()) { 13451 if ((flags & (ViewGroup.FLAG_OPTIMIZE_INVALIDATE | ViewGroup.FLAG_ANIMATION_DONE)) == 13452 ViewGroup.FLAG_OPTIMIZE_INVALIDATE) { 13453 parent.mGroupFlags |= ViewGroup.FLAG_INVALIDATE_REQUIRED; 13454 } else if ((flags & ViewGroup.FLAG_INVALIDATE_REQUIRED) == 0) { 13455 // The child need to draw an animation, potentially offscreen, so 13456 // make sure we do not cancel invalidate requests 13457 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13458 parent.invalidate(mLeft, mTop, mRight, mBottom); 13459 } 13460 } else { 13461 if (parent.mInvalidateRegion == null) { 13462 parent.mInvalidateRegion = new RectF(); 13463 } 13464 final RectF region = parent.mInvalidateRegion; 13465 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 13466 invalidationTransform); 13467 13468 // The child need to draw an animation, potentially offscreen, so 13469 // make sure we do not cancel invalidate requests 13470 parent.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 13471 13472 final int left = mLeft + (int) region.left; 13473 final int top = mTop + (int) region.top; 13474 parent.invalidate(left, top, left + (int) (region.width() + .5f), 13475 top + (int) (region.height() + .5f)); 13476 } 13477 } 13478 return more; 13479 } 13480 13481 /** 13482 * This method is called by getDisplayList() when a display list is created or re-rendered. 13483 * It sets or resets the current value of all properties on that display list (resetting is 13484 * necessary when a display list is being re-created, because we need to make sure that 13485 * previously-set transform values 13486 */ 13487 void setDisplayListProperties(DisplayList displayList) { 13488 if (displayList != null) { 13489 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13490 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 13491 if (mParent instanceof ViewGroup) { 13492 displayList.setClipToBounds( 13493 (((ViewGroup) mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 13494 } 13495 float alpha = 1; 13496 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 13497 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13498 ViewGroup parentVG = (ViewGroup) mParent; 13499 final boolean hasTransform = 13500 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 13501 if (hasTransform) { 13502 Transformation transform = parentVG.mChildTransformation; 13503 final int transformType = parentVG.mChildTransformation.getTransformationType(); 13504 if (transformType != Transformation.TYPE_IDENTITY) { 13505 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 13506 alpha = transform.getAlpha(); 13507 } 13508 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 13509 displayList.setMatrix(transform.getMatrix()); 13510 } 13511 } 13512 } 13513 } 13514 if (mTransformationInfo != null) { 13515 alpha *= mTransformationInfo.mAlpha; 13516 if (alpha < 1) { 13517 final int multipliedAlpha = (int) (255 * alpha); 13518 if (onSetAlpha(multipliedAlpha)) { 13519 alpha = 1; 13520 } 13521 } 13522 displayList.setTransformationInfo(alpha, 13523 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 13524 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 13525 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 13526 mTransformationInfo.mScaleY); 13527 if (mTransformationInfo.mCamera == null) { 13528 mTransformationInfo.mCamera = new Camera(); 13529 mTransformationInfo.matrix3D = new Matrix(); 13530 } 13531 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 13532 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == PFLAG_PIVOT_EXPLICITLY_SET) { 13533 displayList.setPivotX(getPivotX()); 13534 displayList.setPivotY(getPivotY()); 13535 } 13536 } else if (alpha < 1) { 13537 displayList.setAlpha(alpha); 13538 } 13539 } 13540 } 13541 13542 /** 13543 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 13544 * This draw() method is an implementation detail and is not intended to be overridden or 13545 * to be called from anywhere else other than ViewGroup.drawChild(). 13546 */ 13547 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 13548 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 13549 boolean more = false; 13550 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 13551 final int flags = parent.mGroupFlags; 13552 13553 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 13554 parent.mChildTransformation.clear(); 13555 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13556 } 13557 13558 Transformation transformToApply = null; 13559 boolean concatMatrix = false; 13560 13561 boolean scalingRequired = false; 13562 boolean caching; 13563 int layerType = getLayerType(); 13564 13565 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 13566 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 13567 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 13568 caching = true; 13569 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 13570 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 13571 } else { 13572 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 13573 } 13574 13575 final Animation a = getAnimation(); 13576 if (a != null) { 13577 more = drawAnimation(parent, drawingTime, a, scalingRequired); 13578 concatMatrix = a.willChangeTransformationMatrix(); 13579 if (concatMatrix) { 13580 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13581 } 13582 transformToApply = parent.mChildTransformation; 13583 } else { 13584 if ((mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_TRANSFORM) == 13585 PFLAG3_VIEW_IS_ANIMATING_TRANSFORM && mDisplayList != null) { 13586 // No longer animating: clear out old animation matrix 13587 mDisplayList.setAnimationMatrix(null); 13588 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_TRANSFORM; 13589 } 13590 if (!useDisplayListProperties && 13591 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 13592 final boolean hasTransform = 13593 parent.getChildStaticTransformation(this, parent.mChildTransformation); 13594 if (hasTransform) { 13595 final int transformType = parent.mChildTransformation.getTransformationType(); 13596 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 13597 parent.mChildTransformation : null; 13598 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 13599 } 13600 } 13601 } 13602 13603 concatMatrix |= !childHasIdentityMatrix; 13604 13605 // Sets the flag as early as possible to allow draw() implementations 13606 // to call invalidate() successfully when doing animations 13607 mPrivateFlags |= PFLAG_DRAWN; 13608 13609 if (!concatMatrix && 13610 (flags & (ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS | 13611 ViewGroup.FLAG_CLIP_CHILDREN)) == ViewGroup.FLAG_CLIP_CHILDREN && 13612 canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 13613 (mPrivateFlags & PFLAG_DRAW_ANIMATION) == 0) { 13614 mPrivateFlags2 |= PFLAG2_VIEW_QUICK_REJECTED; 13615 return more; 13616 } 13617 mPrivateFlags2 &= ~PFLAG2_VIEW_QUICK_REJECTED; 13618 13619 if (hardwareAccelerated) { 13620 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 13621 // retain the flag's value temporarily in the mRecreateDisplayList flag 13622 mRecreateDisplayList = (mPrivateFlags & PFLAG_INVALIDATED) == PFLAG_INVALIDATED; 13623 mPrivateFlags &= ~PFLAG_INVALIDATED; 13624 } 13625 13626 DisplayList displayList = null; 13627 Bitmap cache = null; 13628 boolean hasDisplayList = false; 13629 if (caching) { 13630 if (!hardwareAccelerated) { 13631 if (layerType != LAYER_TYPE_NONE) { 13632 layerType = LAYER_TYPE_SOFTWARE; 13633 buildDrawingCache(true); 13634 } 13635 cache = getDrawingCache(true); 13636 } else { 13637 switch (layerType) { 13638 case LAYER_TYPE_SOFTWARE: 13639 if (useDisplayListProperties) { 13640 hasDisplayList = canHaveDisplayList(); 13641 } else { 13642 buildDrawingCache(true); 13643 cache = getDrawingCache(true); 13644 } 13645 break; 13646 case LAYER_TYPE_HARDWARE: 13647 if (useDisplayListProperties) { 13648 hasDisplayList = canHaveDisplayList(); 13649 } 13650 break; 13651 case LAYER_TYPE_NONE: 13652 // Delay getting the display list until animation-driven alpha values are 13653 // set up and possibly passed on to the view 13654 hasDisplayList = canHaveDisplayList(); 13655 break; 13656 } 13657 } 13658 } 13659 useDisplayListProperties &= hasDisplayList; 13660 if (useDisplayListProperties) { 13661 displayList = getDisplayList(); 13662 if (!displayList.isValid()) { 13663 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13664 // to getDisplayList(), the display list will be marked invalid and we should not 13665 // try to use it again. 13666 displayList = null; 13667 hasDisplayList = false; 13668 useDisplayListProperties = false; 13669 } 13670 } 13671 13672 int sx = 0; 13673 int sy = 0; 13674 if (!hasDisplayList) { 13675 computeScroll(); 13676 sx = mScrollX; 13677 sy = mScrollY; 13678 } 13679 13680 final boolean hasNoCache = cache == null || hasDisplayList; 13681 final boolean offsetForScroll = cache == null && !hasDisplayList && 13682 layerType != LAYER_TYPE_HARDWARE; 13683 13684 int restoreTo = -1; 13685 if (!useDisplayListProperties || transformToApply != null) { 13686 restoreTo = canvas.save(); 13687 } 13688 if (offsetForScroll) { 13689 canvas.translate(mLeft - sx, mTop - sy); 13690 } else { 13691 if (!useDisplayListProperties) { 13692 canvas.translate(mLeft, mTop); 13693 } 13694 if (scalingRequired) { 13695 if (useDisplayListProperties) { 13696 // TODO: Might not need this if we put everything inside the DL 13697 restoreTo = canvas.save(); 13698 } 13699 // mAttachInfo cannot be null, otherwise scalingRequired == false 13700 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13701 canvas.scale(scale, scale); 13702 } 13703 } 13704 13705 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13706 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix() || 13707 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13708 if (transformToApply != null || !childHasIdentityMatrix) { 13709 int transX = 0; 13710 int transY = 0; 13711 13712 if (offsetForScroll) { 13713 transX = -sx; 13714 transY = -sy; 13715 } 13716 13717 if (transformToApply != null) { 13718 if (concatMatrix) { 13719 if (useDisplayListProperties) { 13720 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13721 } else { 13722 // Undo the scroll translation, apply the transformation matrix, 13723 // then redo the scroll translate to get the correct result. 13724 canvas.translate(-transX, -transY); 13725 canvas.concat(transformToApply.getMatrix()); 13726 canvas.translate(transX, transY); 13727 } 13728 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13729 } 13730 13731 float transformAlpha = transformToApply.getAlpha(); 13732 if (transformAlpha < 1) { 13733 alpha *= transformAlpha; 13734 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13735 } 13736 } 13737 13738 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13739 canvas.translate(-transX, -transY); 13740 canvas.concat(getMatrix()); 13741 canvas.translate(transX, transY); 13742 } 13743 } 13744 13745 // Deal with alpha if it is or used to be <1 13746 if (alpha < 1 || 13747 (mPrivateFlags3 & PFLAG3_VIEW_IS_ANIMATING_ALPHA) == PFLAG3_VIEW_IS_ANIMATING_ALPHA) { 13748 if (alpha < 1) { 13749 mPrivateFlags3 |= PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13750 } else { 13751 mPrivateFlags3 &= ~PFLAG3_VIEW_IS_ANIMATING_ALPHA; 13752 } 13753 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13754 if (hasNoCache) { 13755 final int multipliedAlpha = (int) (255 * alpha); 13756 if (!onSetAlpha(multipliedAlpha)) { 13757 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13758 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13759 layerType != LAYER_TYPE_NONE) { 13760 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13761 } 13762 if (useDisplayListProperties) { 13763 displayList.setAlpha(alpha * getAlpha()); 13764 } else if (layerType == LAYER_TYPE_NONE) { 13765 final int scrollX = hasDisplayList ? 0 : sx; 13766 final int scrollY = hasDisplayList ? 0 : sy; 13767 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13768 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13769 } 13770 } else { 13771 // Alpha is handled by the child directly, clobber the layer's alpha 13772 mPrivateFlags |= PFLAG_ALPHA_SET; 13773 } 13774 } 13775 } 13776 } else if ((mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13777 onSetAlpha(255); 13778 mPrivateFlags &= ~PFLAG_ALPHA_SET; 13779 } 13780 13781 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13782 !useDisplayListProperties && layerType == LAYER_TYPE_NONE) { 13783 if (offsetForScroll) { 13784 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13785 } else { 13786 if (!scalingRequired || cache == null) { 13787 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13788 } else { 13789 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13790 } 13791 } 13792 } 13793 13794 if (!useDisplayListProperties && hasDisplayList) { 13795 displayList = getDisplayList(); 13796 if (!displayList.isValid()) { 13797 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13798 // to getDisplayList(), the display list will be marked invalid and we should not 13799 // try to use it again. 13800 displayList = null; 13801 hasDisplayList = false; 13802 } 13803 } 13804 13805 if (hasNoCache) { 13806 boolean layerRendered = false; 13807 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13808 final HardwareLayer layer = getHardwareLayer(); 13809 if (layer != null && layer.isValid()) { 13810 mLayerPaint.setAlpha((int) (alpha * 255)); 13811 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13812 layerRendered = true; 13813 } else { 13814 final int scrollX = hasDisplayList ? 0 : sx; 13815 final int scrollY = hasDisplayList ? 0 : sy; 13816 canvas.saveLayer(scrollX, scrollY, 13817 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13818 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13819 } 13820 } 13821 13822 if (!layerRendered) { 13823 if (!hasDisplayList) { 13824 // Fast path for layouts with no backgrounds 13825 if ((mPrivateFlags & PFLAG_SKIP_DRAW) == PFLAG_SKIP_DRAW) { 13826 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13827 dispatchDraw(canvas); 13828 } else { 13829 draw(canvas); 13830 } 13831 } else { 13832 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13833 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13834 } 13835 } 13836 } else if (cache != null) { 13837 mPrivateFlags &= ~PFLAG_DIRTY_MASK; 13838 Paint cachePaint; 13839 13840 if (layerType == LAYER_TYPE_NONE) { 13841 cachePaint = parent.mCachePaint; 13842 if (cachePaint == null) { 13843 cachePaint = new Paint(); 13844 cachePaint.setDither(false); 13845 parent.mCachePaint = cachePaint; 13846 } 13847 if (alpha < 1) { 13848 cachePaint.setAlpha((int) (alpha * 255)); 13849 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13850 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13851 cachePaint.setAlpha(255); 13852 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13853 } 13854 } else { 13855 cachePaint = mLayerPaint; 13856 cachePaint.setAlpha((int) (alpha * 255)); 13857 } 13858 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13859 } 13860 13861 if (restoreTo >= 0) { 13862 canvas.restoreToCount(restoreTo); 13863 } 13864 13865 if (a != null && !more) { 13866 if (!hardwareAccelerated && !a.getFillAfter()) { 13867 onSetAlpha(255); 13868 } 13869 parent.finishAnimatingView(this, a); 13870 } 13871 13872 if (more && hardwareAccelerated) { 13873 // invalidation is the trigger to recreate display lists, so if we're using 13874 // display lists to render, force an invalidate to allow the animation to 13875 // continue drawing another frame 13876 parent.invalidate(true); 13877 if (a.hasAlpha() && (mPrivateFlags & PFLAG_ALPHA_SET) == PFLAG_ALPHA_SET) { 13878 // alpha animations should cause the child to recreate its display list 13879 invalidate(true); 13880 } 13881 } 13882 13883 mRecreateDisplayList = false; 13884 13885 return more; 13886 } 13887 13888 /** 13889 * Manually render this view (and all of its children) to the given Canvas. 13890 * The view must have already done a full layout before this function is 13891 * called. When implementing a view, implement 13892 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13893 * If you do need to override this method, call the superclass version. 13894 * 13895 * @param canvas The Canvas to which the View is rendered. 13896 */ 13897 public void draw(Canvas canvas) { 13898 if (mClipBounds != null) { 13899 canvas.clipRect(mClipBounds); 13900 } 13901 final int privateFlags = mPrivateFlags; 13902 final boolean dirtyOpaque = (privateFlags & PFLAG_DIRTY_MASK) == PFLAG_DIRTY_OPAQUE && 13903 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13904 mPrivateFlags = (privateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 13905 13906 /* 13907 * Draw traversal performs several drawing steps which must be executed 13908 * in the appropriate order: 13909 * 13910 * 1. Draw the background 13911 * 2. If necessary, save the canvas' layers to prepare for fading 13912 * 3. Draw view's content 13913 * 4. Draw children 13914 * 5. If necessary, draw the fading edges and restore layers 13915 * 6. Draw decorations (scrollbars for instance) 13916 */ 13917 13918 // Step 1, draw the background, if needed 13919 int saveCount; 13920 13921 if (!dirtyOpaque) { 13922 final Drawable background = mBackground; 13923 if (background != null) { 13924 final int scrollX = mScrollX; 13925 final int scrollY = mScrollY; 13926 13927 if (mBackgroundSizeChanged) { 13928 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13929 mBackgroundSizeChanged = false; 13930 } 13931 13932 if ((scrollX | scrollY) == 0) { 13933 background.draw(canvas); 13934 } else { 13935 canvas.translate(scrollX, scrollY); 13936 background.draw(canvas); 13937 canvas.translate(-scrollX, -scrollY); 13938 } 13939 } 13940 } 13941 13942 // skip step 2 & 5 if possible (common case) 13943 final int viewFlags = mViewFlags; 13944 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13945 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13946 if (!verticalEdges && !horizontalEdges) { 13947 // Step 3, draw the content 13948 if (!dirtyOpaque) onDraw(canvas); 13949 13950 // Step 4, draw the children 13951 dispatchDraw(canvas); 13952 13953 // Step 6, draw decorations (scrollbars) 13954 onDrawScrollBars(canvas); 13955 13956 if (mOverlay != null && !mOverlay.isEmpty()) { 13957 mOverlay.getOverlayView().dispatchDraw(canvas); 13958 } 13959 13960 // we're done... 13961 return; 13962 } 13963 13964 /* 13965 * Here we do the full fledged routine... 13966 * (this is an uncommon case where speed matters less, 13967 * this is why we repeat some of the tests that have been 13968 * done above) 13969 */ 13970 13971 boolean drawTop = false; 13972 boolean drawBottom = false; 13973 boolean drawLeft = false; 13974 boolean drawRight = false; 13975 13976 float topFadeStrength = 0.0f; 13977 float bottomFadeStrength = 0.0f; 13978 float leftFadeStrength = 0.0f; 13979 float rightFadeStrength = 0.0f; 13980 13981 // Step 2, save the canvas' layers 13982 int paddingLeft = mPaddingLeft; 13983 13984 final boolean offsetRequired = isPaddingOffsetRequired(); 13985 if (offsetRequired) { 13986 paddingLeft += getLeftPaddingOffset(); 13987 } 13988 13989 int left = mScrollX + paddingLeft; 13990 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13991 int top = mScrollY + getFadeTop(offsetRequired); 13992 int bottom = top + getFadeHeight(offsetRequired); 13993 13994 if (offsetRequired) { 13995 right += getRightPaddingOffset(); 13996 bottom += getBottomPaddingOffset(); 13997 } 13998 13999 final ScrollabilityCache scrollabilityCache = mScrollCache; 14000 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 14001 int length = (int) fadeHeight; 14002 14003 // clip the fade length if top and bottom fades overlap 14004 // overlapping fades produce odd-looking artifacts 14005 if (verticalEdges && (top + length > bottom - length)) { 14006 length = (bottom - top) / 2; 14007 } 14008 14009 // also clip horizontal fades if necessary 14010 if (horizontalEdges && (left + length > right - length)) { 14011 length = (right - left) / 2; 14012 } 14013 14014 if (verticalEdges) { 14015 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 14016 drawTop = topFadeStrength * fadeHeight > 1.0f; 14017 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 14018 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 14019 } 14020 14021 if (horizontalEdges) { 14022 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 14023 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 14024 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 14025 drawRight = rightFadeStrength * fadeHeight > 1.0f; 14026 } 14027 14028 saveCount = canvas.getSaveCount(); 14029 14030 int solidColor = getSolidColor(); 14031 if (solidColor == 0) { 14032 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 14033 14034 if (drawTop) { 14035 canvas.saveLayer(left, top, right, top + length, null, flags); 14036 } 14037 14038 if (drawBottom) { 14039 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 14040 } 14041 14042 if (drawLeft) { 14043 canvas.saveLayer(left, top, left + length, bottom, null, flags); 14044 } 14045 14046 if (drawRight) { 14047 canvas.saveLayer(right - length, top, right, bottom, null, flags); 14048 } 14049 } else { 14050 scrollabilityCache.setFadeColor(solidColor); 14051 } 14052 14053 // Step 3, draw the content 14054 if (!dirtyOpaque) onDraw(canvas); 14055 14056 // Step 4, draw the children 14057 dispatchDraw(canvas); 14058 14059 // Step 5, draw the fade effect and restore layers 14060 final Paint p = scrollabilityCache.paint; 14061 final Matrix matrix = scrollabilityCache.matrix; 14062 final Shader fade = scrollabilityCache.shader; 14063 14064 if (drawTop) { 14065 matrix.setScale(1, fadeHeight * topFadeStrength); 14066 matrix.postTranslate(left, top); 14067 fade.setLocalMatrix(matrix); 14068 canvas.drawRect(left, top, right, top + length, p); 14069 } 14070 14071 if (drawBottom) { 14072 matrix.setScale(1, fadeHeight * bottomFadeStrength); 14073 matrix.postRotate(180); 14074 matrix.postTranslate(left, bottom); 14075 fade.setLocalMatrix(matrix); 14076 canvas.drawRect(left, bottom - length, right, bottom, p); 14077 } 14078 14079 if (drawLeft) { 14080 matrix.setScale(1, fadeHeight * leftFadeStrength); 14081 matrix.postRotate(-90); 14082 matrix.postTranslate(left, top); 14083 fade.setLocalMatrix(matrix); 14084 canvas.drawRect(left, top, left + length, bottom, p); 14085 } 14086 14087 if (drawRight) { 14088 matrix.setScale(1, fadeHeight * rightFadeStrength); 14089 matrix.postRotate(90); 14090 matrix.postTranslate(right, top); 14091 fade.setLocalMatrix(matrix); 14092 canvas.drawRect(right - length, top, right, bottom, p); 14093 } 14094 14095 canvas.restoreToCount(saveCount); 14096 14097 // Step 6, draw decorations (scrollbars) 14098 onDrawScrollBars(canvas); 14099 14100 if (mOverlay != null && !mOverlay.isEmpty()) { 14101 mOverlay.getOverlayView().dispatchDraw(canvas); 14102 } 14103 } 14104 14105 /** 14106 * Returns the overlay for this view, creating it if it does not yet exist. 14107 * Adding drawables to the overlay will cause them to be displayed whenever 14108 * the view itself is redrawn. Objects in the overlay should be actively 14109 * managed: remove them when they should not be displayed anymore. The 14110 * overlay will always have the same size as its host view. 14111 * 14112 * <p>Note: Overlays do not currently work correctly with {@link 14113 * SurfaceView} or {@link TextureView}; contents in overlays for these 14114 * types of views may not display correctly.</p> 14115 * 14116 * @return The ViewOverlay object for this view. 14117 * @see ViewOverlay 14118 */ 14119 public ViewOverlay getOverlay() { 14120 if (mOverlay == null) { 14121 mOverlay = new ViewOverlay(mContext, this); 14122 } 14123 return mOverlay; 14124 } 14125 14126 /** 14127 * Override this if your view is known to always be drawn on top of a solid color background, 14128 * and needs to draw fading edges. Returning a non-zero color enables the view system to 14129 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 14130 * should be set to 0xFF. 14131 * 14132 * @see #setVerticalFadingEdgeEnabled(boolean) 14133 * @see #setHorizontalFadingEdgeEnabled(boolean) 14134 * 14135 * @return The known solid color background for this view, or 0 if the color may vary 14136 */ 14137 @ViewDebug.ExportedProperty(category = "drawing") 14138 public int getSolidColor() { 14139 return 0; 14140 } 14141 14142 /** 14143 * Build a human readable string representation of the specified view flags. 14144 * 14145 * @param flags the view flags to convert to a string 14146 * @return a String representing the supplied flags 14147 */ 14148 private static String printFlags(int flags) { 14149 String output = ""; 14150 int numFlags = 0; 14151 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 14152 output += "TAKES_FOCUS"; 14153 numFlags++; 14154 } 14155 14156 switch (flags & VISIBILITY_MASK) { 14157 case INVISIBLE: 14158 if (numFlags > 0) { 14159 output += " "; 14160 } 14161 output += "INVISIBLE"; 14162 // USELESS HERE numFlags++; 14163 break; 14164 case GONE: 14165 if (numFlags > 0) { 14166 output += " "; 14167 } 14168 output += "GONE"; 14169 // USELESS HERE numFlags++; 14170 break; 14171 default: 14172 break; 14173 } 14174 return output; 14175 } 14176 14177 /** 14178 * Build a human readable string representation of the specified private 14179 * view flags. 14180 * 14181 * @param privateFlags the private view flags to convert to a string 14182 * @return a String representing the supplied flags 14183 */ 14184 private static String printPrivateFlags(int privateFlags) { 14185 String output = ""; 14186 int numFlags = 0; 14187 14188 if ((privateFlags & PFLAG_WANTS_FOCUS) == PFLAG_WANTS_FOCUS) { 14189 output += "WANTS_FOCUS"; 14190 numFlags++; 14191 } 14192 14193 if ((privateFlags & PFLAG_FOCUSED) == PFLAG_FOCUSED) { 14194 if (numFlags > 0) { 14195 output += " "; 14196 } 14197 output += "FOCUSED"; 14198 numFlags++; 14199 } 14200 14201 if ((privateFlags & PFLAG_SELECTED) == PFLAG_SELECTED) { 14202 if (numFlags > 0) { 14203 output += " "; 14204 } 14205 output += "SELECTED"; 14206 numFlags++; 14207 } 14208 14209 if ((privateFlags & PFLAG_IS_ROOT_NAMESPACE) == PFLAG_IS_ROOT_NAMESPACE) { 14210 if (numFlags > 0) { 14211 output += " "; 14212 } 14213 output += "IS_ROOT_NAMESPACE"; 14214 numFlags++; 14215 } 14216 14217 if ((privateFlags & PFLAG_HAS_BOUNDS) == PFLAG_HAS_BOUNDS) { 14218 if (numFlags > 0) { 14219 output += " "; 14220 } 14221 output += "HAS_BOUNDS"; 14222 numFlags++; 14223 } 14224 14225 if ((privateFlags & PFLAG_DRAWN) == PFLAG_DRAWN) { 14226 if (numFlags > 0) { 14227 output += " "; 14228 } 14229 output += "DRAWN"; 14230 // USELESS HERE numFlags++; 14231 } 14232 return output; 14233 } 14234 14235 /** 14236 * <p>Indicates whether or not this view's layout will be requested during 14237 * the next hierarchy layout pass.</p> 14238 * 14239 * @return true if the layout will be forced during next layout pass 14240 */ 14241 public boolean isLayoutRequested() { 14242 return (mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT; 14243 } 14244 14245 /** 14246 * Return true if o is a ViewGroup that is laying out using optical bounds. 14247 * @hide 14248 */ 14249 public static boolean isLayoutModeOptical(Object o) { 14250 return o instanceof ViewGroup && ((ViewGroup) o).isLayoutModeOptical(); 14251 } 14252 14253 private boolean setOpticalFrame(int left, int top, int right, int bottom) { 14254 Insets parentInsets = mParent instanceof View ? 14255 ((View) mParent).getOpticalInsets() : Insets.NONE; 14256 Insets childInsets = getOpticalInsets(); 14257 return setFrame( 14258 left + parentInsets.left - childInsets.left, 14259 top + parentInsets.top - childInsets.top, 14260 right + parentInsets.left + childInsets.right, 14261 bottom + parentInsets.top + childInsets.bottom); 14262 } 14263 14264 /** 14265 * Assign a size and position to a view and all of its 14266 * descendants 14267 * 14268 * <p>This is the second phase of the layout mechanism. 14269 * (The first is measuring). In this phase, each parent calls 14270 * layout on all of its children to position them. 14271 * This is typically done using the child measurements 14272 * that were stored in the measure pass().</p> 14273 * 14274 * <p>Derived classes should not override this method. 14275 * Derived classes with children should override 14276 * onLayout. In that method, they should 14277 * call layout on each of their children.</p> 14278 * 14279 * @param l Left position, relative to parent 14280 * @param t Top position, relative to parent 14281 * @param r Right position, relative to parent 14282 * @param b Bottom position, relative to parent 14283 */ 14284 @SuppressWarnings({"unchecked"}) 14285 public void layout(int l, int t, int r, int b) { 14286 int oldL = mLeft; 14287 int oldT = mTop; 14288 int oldB = mBottom; 14289 int oldR = mRight; 14290 boolean changed = isLayoutModeOptical(mParent) ? 14291 setOpticalFrame(l, t, r, b) : setFrame(l, t, r, b); 14292 if (changed || (mPrivateFlags & PFLAG_LAYOUT_REQUIRED) == PFLAG_LAYOUT_REQUIRED) { 14293 onLayout(changed, l, t, r, b); 14294 mPrivateFlags &= ~PFLAG_LAYOUT_REQUIRED; 14295 14296 ListenerInfo li = mListenerInfo; 14297 if (li != null && li.mOnLayoutChangeListeners != null) { 14298 ArrayList<OnLayoutChangeListener> listenersCopy = 14299 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 14300 int numListeners = listenersCopy.size(); 14301 for (int i = 0; i < numListeners; ++i) { 14302 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 14303 } 14304 } 14305 } 14306 mPrivateFlags &= ~PFLAG_FORCE_LAYOUT; 14307 } 14308 14309 /** 14310 * Called from layout when this view should 14311 * assign a size and position to each of its children. 14312 * 14313 * Derived classes with children should override 14314 * this method and call layout on each of 14315 * their children. 14316 * @param changed This is a new size or position for this view 14317 * @param left Left position, relative to parent 14318 * @param top Top position, relative to parent 14319 * @param right Right position, relative to parent 14320 * @param bottom Bottom position, relative to parent 14321 */ 14322 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 14323 } 14324 14325 /** 14326 * Assign a size and position to this view. 14327 * 14328 * This is called from layout. 14329 * 14330 * @param left Left position, relative to parent 14331 * @param top Top position, relative to parent 14332 * @param right Right position, relative to parent 14333 * @param bottom Bottom position, relative to parent 14334 * @return true if the new size and position are different than the 14335 * previous ones 14336 * {@hide} 14337 */ 14338 protected boolean setFrame(int left, int top, int right, int bottom) { 14339 boolean changed = false; 14340 14341 if (DBG) { 14342 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 14343 + right + "," + bottom + ")"); 14344 } 14345 14346 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 14347 changed = true; 14348 14349 // Remember our drawn bit 14350 int drawn = mPrivateFlags & PFLAG_DRAWN; 14351 14352 int oldWidth = mRight - mLeft; 14353 int oldHeight = mBottom - mTop; 14354 int newWidth = right - left; 14355 int newHeight = bottom - top; 14356 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 14357 14358 // Invalidate our old position 14359 invalidate(sizeChanged); 14360 14361 mLeft = left; 14362 mTop = top; 14363 mRight = right; 14364 mBottom = bottom; 14365 if (mDisplayList != null) { 14366 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 14367 } 14368 14369 mPrivateFlags |= PFLAG_HAS_BOUNDS; 14370 14371 14372 if (sizeChanged) { 14373 if ((mPrivateFlags & PFLAG_PIVOT_EXPLICITLY_SET) == 0) { 14374 // A change in dimension means an auto-centered pivot point changes, too 14375 if (mTransformationInfo != null) { 14376 mTransformationInfo.mMatrixDirty = true; 14377 } 14378 } 14379 sizeChange(newWidth, newHeight, oldWidth, oldHeight); 14380 } 14381 14382 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 14383 // If we are visible, force the DRAWN bit to on so that 14384 // this invalidate will go through (at least to our parent). 14385 // This is because someone may have invalidated this view 14386 // before this call to setFrame came in, thereby clearing 14387 // the DRAWN bit. 14388 mPrivateFlags |= PFLAG_DRAWN; 14389 invalidate(sizeChanged); 14390 // parent display list may need to be recreated based on a change in the bounds 14391 // of any child 14392 invalidateParentCaches(); 14393 } 14394 14395 // Reset drawn bit to original value (invalidate turns it off) 14396 mPrivateFlags |= drawn; 14397 14398 mBackgroundSizeChanged = true; 14399 } 14400 return changed; 14401 } 14402 14403 private void sizeChange(int newWidth, int newHeight, int oldWidth, int oldHeight) { 14404 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 14405 if (mOverlay != null) { 14406 mOverlay.getOverlayView().setRight(newWidth); 14407 mOverlay.getOverlayView().setBottom(newHeight); 14408 } 14409 } 14410 14411 /** 14412 * Finalize inflating a view from XML. This is called as the last phase 14413 * of inflation, after all child views have been added. 14414 * 14415 * <p>Even if the subclass overrides onFinishInflate, they should always be 14416 * sure to call the super method, so that we get called. 14417 */ 14418 protected void onFinishInflate() { 14419 } 14420 14421 /** 14422 * Returns the resources associated with this view. 14423 * 14424 * @return Resources object. 14425 */ 14426 public Resources getResources() { 14427 return mResources; 14428 } 14429 14430 /** 14431 * Invalidates the specified Drawable. 14432 * 14433 * @param drawable the drawable to invalidate 14434 */ 14435 public void invalidateDrawable(Drawable drawable) { 14436 if (verifyDrawable(drawable)) { 14437 final Rect dirty = drawable.getBounds(); 14438 final int scrollX = mScrollX; 14439 final int scrollY = mScrollY; 14440 14441 invalidate(dirty.left + scrollX, dirty.top + scrollY, 14442 dirty.right + scrollX, dirty.bottom + scrollY); 14443 } 14444 } 14445 14446 /** 14447 * Schedules an action on a drawable to occur at a specified time. 14448 * 14449 * @param who the recipient of the action 14450 * @param what the action to run on the drawable 14451 * @param when the time at which the action must occur. Uses the 14452 * {@link SystemClock#uptimeMillis} timebase. 14453 */ 14454 public void scheduleDrawable(Drawable who, Runnable what, long when) { 14455 if (verifyDrawable(who) && what != null) { 14456 final long delay = when - SystemClock.uptimeMillis(); 14457 if (mAttachInfo != null) { 14458 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 14459 Choreographer.CALLBACK_ANIMATION, what, who, 14460 Choreographer.subtractFrameDelay(delay)); 14461 } else { 14462 ViewRootImpl.getRunQueue().postDelayed(what, delay); 14463 } 14464 } 14465 } 14466 14467 /** 14468 * Cancels a scheduled action on a drawable. 14469 * 14470 * @param who the recipient of the action 14471 * @param what the action to cancel 14472 */ 14473 public void unscheduleDrawable(Drawable who, Runnable what) { 14474 if (verifyDrawable(who) && what != null) { 14475 if (mAttachInfo != null) { 14476 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14477 Choreographer.CALLBACK_ANIMATION, what, who); 14478 } else { 14479 ViewRootImpl.getRunQueue().removeCallbacks(what); 14480 } 14481 } 14482 } 14483 14484 /** 14485 * Unschedule any events associated with the given Drawable. This can be 14486 * used when selecting a new Drawable into a view, so that the previous 14487 * one is completely unscheduled. 14488 * 14489 * @param who The Drawable to unschedule. 14490 * 14491 * @see #drawableStateChanged 14492 */ 14493 public void unscheduleDrawable(Drawable who) { 14494 if (mAttachInfo != null && who != null) { 14495 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 14496 Choreographer.CALLBACK_ANIMATION, null, who); 14497 } 14498 } 14499 14500 /** 14501 * Resolve the Drawables depending on the layout direction. This is implicitly supposing 14502 * that the View directionality can and will be resolved before its Drawables. 14503 * 14504 * Will call {@link View#onResolveDrawables} when resolution is done. 14505 * 14506 * @hide 14507 */ 14508 protected void resolveDrawables() { 14509 if (canResolveLayoutDirection()) { 14510 if (mBackground != null) { 14511 mBackground.setLayoutDirection(getLayoutDirection()); 14512 } 14513 mPrivateFlags2 |= PFLAG2_DRAWABLE_RESOLVED; 14514 onResolveDrawables(getLayoutDirection()); 14515 } 14516 } 14517 14518 /** 14519 * Called when layout direction has been resolved. 14520 * 14521 * The default implementation does nothing. 14522 * 14523 * @param layoutDirection The resolved layout direction. 14524 * 14525 * @see #LAYOUT_DIRECTION_LTR 14526 * @see #LAYOUT_DIRECTION_RTL 14527 * 14528 * @hide 14529 */ 14530 public void onResolveDrawables(int layoutDirection) { 14531 } 14532 14533 /** 14534 * @hide 14535 */ 14536 protected void resetResolvedDrawables() { 14537 mPrivateFlags2 &= ~PFLAG2_DRAWABLE_RESOLVED; 14538 } 14539 14540 private boolean isDrawablesResolved() { 14541 return (mPrivateFlags2 & PFLAG2_DRAWABLE_RESOLVED) == PFLAG2_DRAWABLE_RESOLVED; 14542 } 14543 14544 /** 14545 * If your view subclass is displaying its own Drawable objects, it should 14546 * override this function and return true for any Drawable it is 14547 * displaying. This allows animations for those drawables to be 14548 * scheduled. 14549 * 14550 * <p>Be sure to call through to the super class when overriding this 14551 * function. 14552 * 14553 * @param who The Drawable to verify. Return true if it is one you are 14554 * displaying, else return the result of calling through to the 14555 * super class. 14556 * 14557 * @return boolean If true than the Drawable is being displayed in the 14558 * view; else false and it is not allowed to animate. 14559 * 14560 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 14561 * @see #drawableStateChanged() 14562 */ 14563 protected boolean verifyDrawable(Drawable who) { 14564 return who == mBackground; 14565 } 14566 14567 /** 14568 * This function is called whenever the state of the view changes in such 14569 * a way that it impacts the state of drawables being shown. 14570 * 14571 * <p>Be sure to call through to the superclass when overriding this 14572 * function. 14573 * 14574 * @see Drawable#setState(int[]) 14575 */ 14576 protected void drawableStateChanged() { 14577 Drawable d = mBackground; 14578 if (d != null && d.isStateful()) { 14579 d.setState(getDrawableState()); 14580 } 14581 } 14582 14583 /** 14584 * Call this to force a view to update its drawable state. This will cause 14585 * drawableStateChanged to be called on this view. Views that are interested 14586 * in the new state should call getDrawableState. 14587 * 14588 * @see #drawableStateChanged 14589 * @see #getDrawableState 14590 */ 14591 public void refreshDrawableState() { 14592 mPrivateFlags |= PFLAG_DRAWABLE_STATE_DIRTY; 14593 drawableStateChanged(); 14594 14595 ViewParent parent = mParent; 14596 if (parent != null) { 14597 parent.childDrawableStateChanged(this); 14598 } 14599 } 14600 14601 /** 14602 * Return an array of resource IDs of the drawable states representing the 14603 * current state of the view. 14604 * 14605 * @return The current drawable state 14606 * 14607 * @see Drawable#setState(int[]) 14608 * @see #drawableStateChanged() 14609 * @see #onCreateDrawableState(int) 14610 */ 14611 public final int[] getDrawableState() { 14612 if ((mDrawableState != null) && ((mPrivateFlags & PFLAG_DRAWABLE_STATE_DIRTY) == 0)) { 14613 return mDrawableState; 14614 } else { 14615 mDrawableState = onCreateDrawableState(0); 14616 mPrivateFlags &= ~PFLAG_DRAWABLE_STATE_DIRTY; 14617 return mDrawableState; 14618 } 14619 } 14620 14621 /** 14622 * Generate the new {@link android.graphics.drawable.Drawable} state for 14623 * this view. This is called by the view 14624 * system when the cached Drawable state is determined to be invalid. To 14625 * retrieve the current state, you should use {@link #getDrawableState}. 14626 * 14627 * @param extraSpace if non-zero, this is the number of extra entries you 14628 * would like in the returned array in which you can place your own 14629 * states. 14630 * 14631 * @return Returns an array holding the current {@link Drawable} state of 14632 * the view. 14633 * 14634 * @see #mergeDrawableStates(int[], int[]) 14635 */ 14636 protected int[] onCreateDrawableState(int extraSpace) { 14637 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 14638 mParent instanceof View) { 14639 return ((View) mParent).onCreateDrawableState(extraSpace); 14640 } 14641 14642 int[] drawableState; 14643 14644 int privateFlags = mPrivateFlags; 14645 14646 int viewStateIndex = 0; 14647 if ((privateFlags & PFLAG_PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 14648 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 14649 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 14650 if ((privateFlags & PFLAG_SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 14651 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 14652 if ((privateFlags & PFLAG_ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 14653 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 14654 HardwareRenderer.isAvailable()) { 14655 // This is set if HW acceleration is requested, even if the current 14656 // process doesn't allow it. This is just to allow app preview 14657 // windows to better match their app. 14658 viewStateIndex |= VIEW_STATE_ACCELERATED; 14659 } 14660 if ((privateFlags & PFLAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 14661 14662 final int privateFlags2 = mPrivateFlags2; 14663 if ((privateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 14664 if ((privateFlags2 & PFLAG2_DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 14665 14666 drawableState = VIEW_STATE_SETS[viewStateIndex]; 14667 14668 //noinspection ConstantIfStatement 14669 if (false) { 14670 Log.i("View", "drawableStateIndex=" + viewStateIndex); 14671 Log.i("View", toString() 14672 + " pressed=" + ((privateFlags & PFLAG_PRESSED) != 0) 14673 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 14674 + " fo=" + hasFocus() 14675 + " sl=" + ((privateFlags & PFLAG_SELECTED) != 0) 14676 + " wf=" + hasWindowFocus() 14677 + ": " + Arrays.toString(drawableState)); 14678 } 14679 14680 if (extraSpace == 0) { 14681 return drawableState; 14682 } 14683 14684 final int[] fullState; 14685 if (drawableState != null) { 14686 fullState = new int[drawableState.length + extraSpace]; 14687 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 14688 } else { 14689 fullState = new int[extraSpace]; 14690 } 14691 14692 return fullState; 14693 } 14694 14695 /** 14696 * Merge your own state values in <var>additionalState</var> into the base 14697 * state values <var>baseState</var> that were returned by 14698 * {@link #onCreateDrawableState(int)}. 14699 * 14700 * @param baseState The base state values returned by 14701 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 14702 * own additional state values. 14703 * 14704 * @param additionalState The additional state values you would like 14705 * added to <var>baseState</var>; this array is not modified. 14706 * 14707 * @return As a convenience, the <var>baseState</var> array you originally 14708 * passed into the function is returned. 14709 * 14710 * @see #onCreateDrawableState(int) 14711 */ 14712 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 14713 final int N = baseState.length; 14714 int i = N - 1; 14715 while (i >= 0 && baseState[i] == 0) { 14716 i--; 14717 } 14718 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 14719 return baseState; 14720 } 14721 14722 /** 14723 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 14724 * on all Drawable objects associated with this view. 14725 */ 14726 public void jumpDrawablesToCurrentState() { 14727 if (mBackground != null) { 14728 mBackground.jumpToCurrentState(); 14729 } 14730 } 14731 14732 /** 14733 * Sets the background color for this view. 14734 * @param color the color of the background 14735 */ 14736 @RemotableViewMethod 14737 public void setBackgroundColor(int color) { 14738 if (mBackground instanceof ColorDrawable) { 14739 ((ColorDrawable) mBackground.mutate()).setColor(color); 14740 computeOpaqueFlags(); 14741 mBackgroundResource = 0; 14742 } else { 14743 setBackground(new ColorDrawable(color)); 14744 } 14745 } 14746 14747 /** 14748 * Set the background to a given resource. The resource should refer to 14749 * a Drawable object or 0 to remove the background. 14750 * @param resid The identifier of the resource. 14751 * 14752 * @attr ref android.R.styleable#View_background 14753 */ 14754 @RemotableViewMethod 14755 public void setBackgroundResource(int resid) { 14756 if (resid != 0 && resid == mBackgroundResource) { 14757 return; 14758 } 14759 14760 Drawable d= null; 14761 if (resid != 0) { 14762 d = mResources.getDrawable(resid); 14763 } 14764 setBackground(d); 14765 14766 mBackgroundResource = resid; 14767 } 14768 14769 /** 14770 * Set the background to a given Drawable, or remove the background. If the 14771 * background has padding, this View's padding is set to the background's 14772 * padding. However, when a background is removed, this View's padding isn't 14773 * touched. If setting the padding is desired, please use 14774 * {@link #setPadding(int, int, int, int)}. 14775 * 14776 * @param background The Drawable to use as the background, or null to remove the 14777 * background 14778 */ 14779 public void setBackground(Drawable background) { 14780 //noinspection deprecation 14781 setBackgroundDrawable(background); 14782 } 14783 14784 /** 14785 * @deprecated use {@link #setBackground(Drawable)} instead 14786 */ 14787 @Deprecated 14788 public void setBackgroundDrawable(Drawable background) { 14789 computeOpaqueFlags(); 14790 14791 if (background == mBackground) { 14792 return; 14793 } 14794 14795 boolean requestLayout = false; 14796 14797 mBackgroundResource = 0; 14798 14799 /* 14800 * Regardless of whether we're setting a new background or not, we want 14801 * to clear the previous drawable. 14802 */ 14803 if (mBackground != null) { 14804 mBackground.setCallback(null); 14805 unscheduleDrawable(mBackground); 14806 } 14807 14808 if (background != null) { 14809 Rect padding = sThreadLocal.get(); 14810 if (padding == null) { 14811 padding = new Rect(); 14812 sThreadLocal.set(padding); 14813 } 14814 resetResolvedDrawables(); 14815 background.setLayoutDirection(getLayoutDirection()); 14816 if (background.getPadding(padding)) { 14817 resetResolvedPadding(); 14818 switch (background.getLayoutDirection()) { 14819 case LAYOUT_DIRECTION_RTL: 14820 mUserPaddingLeftInitial = padding.right; 14821 mUserPaddingRightInitial = padding.left; 14822 internalSetPadding(padding.right, padding.top, padding.left, padding.bottom); 14823 break; 14824 case LAYOUT_DIRECTION_LTR: 14825 default: 14826 mUserPaddingLeftInitial = padding.left; 14827 mUserPaddingRightInitial = padding.right; 14828 internalSetPadding(padding.left, padding.top, padding.right, padding.bottom); 14829 } 14830 } 14831 14832 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14833 // if it has a different minimum size, we should layout again 14834 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14835 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14836 requestLayout = true; 14837 } 14838 14839 background.setCallback(this); 14840 if (background.isStateful()) { 14841 background.setState(getDrawableState()); 14842 } 14843 background.setVisible(getVisibility() == VISIBLE, false); 14844 mBackground = background; 14845 14846 if ((mPrivateFlags & PFLAG_SKIP_DRAW) != 0) { 14847 mPrivateFlags &= ~PFLAG_SKIP_DRAW; 14848 mPrivateFlags |= PFLAG_ONLY_DRAWS_BACKGROUND; 14849 requestLayout = true; 14850 } 14851 } else { 14852 /* Remove the background */ 14853 mBackground = null; 14854 14855 if ((mPrivateFlags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0) { 14856 /* 14857 * This view ONLY drew the background before and we're removing 14858 * the background, so now it won't draw anything 14859 * (hence we SKIP_DRAW) 14860 */ 14861 mPrivateFlags &= ~PFLAG_ONLY_DRAWS_BACKGROUND; 14862 mPrivateFlags |= PFLAG_SKIP_DRAW; 14863 } 14864 14865 /* 14866 * When the background is set, we try to apply its padding to this 14867 * View. When the background is removed, we don't touch this View's 14868 * padding. This is noted in the Javadocs. Hence, we don't need to 14869 * requestLayout(), the invalidate() below is sufficient. 14870 */ 14871 14872 // The old background's minimum size could have affected this 14873 // View's layout, so let's requestLayout 14874 requestLayout = true; 14875 } 14876 14877 computeOpaqueFlags(); 14878 14879 if (requestLayout) { 14880 requestLayout(); 14881 } 14882 14883 mBackgroundSizeChanged = true; 14884 invalidate(true); 14885 } 14886 14887 /** 14888 * Gets the background drawable 14889 * 14890 * @return The drawable used as the background for this view, if any. 14891 * 14892 * @see #setBackground(Drawable) 14893 * 14894 * @attr ref android.R.styleable#View_background 14895 */ 14896 public Drawable getBackground() { 14897 return mBackground; 14898 } 14899 14900 /** 14901 * Sets the padding. The view may add on the space required to display 14902 * the scrollbars, depending on the style and visibility of the scrollbars. 14903 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14904 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14905 * from the values set in this call. 14906 * 14907 * @attr ref android.R.styleable#View_padding 14908 * @attr ref android.R.styleable#View_paddingBottom 14909 * @attr ref android.R.styleable#View_paddingLeft 14910 * @attr ref android.R.styleable#View_paddingRight 14911 * @attr ref android.R.styleable#View_paddingTop 14912 * @param left the left padding in pixels 14913 * @param top the top padding in pixels 14914 * @param right the right padding in pixels 14915 * @param bottom the bottom padding in pixels 14916 */ 14917 public void setPadding(int left, int top, int right, int bottom) { 14918 resetResolvedPadding(); 14919 14920 mUserPaddingStart = UNDEFINED_PADDING; 14921 mUserPaddingEnd = UNDEFINED_PADDING; 14922 14923 mUserPaddingLeftInitial = left; 14924 mUserPaddingRightInitial = right; 14925 14926 internalSetPadding(left, top, right, bottom); 14927 } 14928 14929 /** 14930 * @hide 14931 */ 14932 protected void internalSetPadding(int left, int top, int right, int bottom) { 14933 mUserPaddingLeft = left; 14934 mUserPaddingRight = right; 14935 mUserPaddingBottom = bottom; 14936 14937 final int viewFlags = mViewFlags; 14938 boolean changed = false; 14939 14940 // Common case is there are no scroll bars. 14941 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14942 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14943 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14944 ? 0 : getVerticalScrollbarWidth(); 14945 switch (mVerticalScrollbarPosition) { 14946 case SCROLLBAR_POSITION_DEFAULT: 14947 if (isLayoutRtl()) { 14948 left += offset; 14949 } else { 14950 right += offset; 14951 } 14952 break; 14953 case SCROLLBAR_POSITION_RIGHT: 14954 right += offset; 14955 break; 14956 case SCROLLBAR_POSITION_LEFT: 14957 left += offset; 14958 break; 14959 } 14960 } 14961 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14962 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14963 ? 0 : getHorizontalScrollbarHeight(); 14964 } 14965 } 14966 14967 if (mPaddingLeft != left) { 14968 changed = true; 14969 mPaddingLeft = left; 14970 } 14971 if (mPaddingTop != top) { 14972 changed = true; 14973 mPaddingTop = top; 14974 } 14975 if (mPaddingRight != right) { 14976 changed = true; 14977 mPaddingRight = right; 14978 } 14979 if (mPaddingBottom != bottom) { 14980 changed = true; 14981 mPaddingBottom = bottom; 14982 } 14983 14984 if (changed) { 14985 requestLayout(); 14986 } 14987 } 14988 14989 /** 14990 * Sets the relative padding. The view may add on the space required to display 14991 * the scrollbars, depending on the style and visibility of the scrollbars. 14992 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 14993 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 14994 * from the values set in this call. 14995 * 14996 * @attr ref android.R.styleable#View_padding 14997 * @attr ref android.R.styleable#View_paddingBottom 14998 * @attr ref android.R.styleable#View_paddingStart 14999 * @attr ref android.R.styleable#View_paddingEnd 15000 * @attr ref android.R.styleable#View_paddingTop 15001 * @param start the start padding in pixels 15002 * @param top the top padding in pixels 15003 * @param end the end padding in pixels 15004 * @param bottom the bottom padding in pixels 15005 */ 15006 public void setPaddingRelative(int start, int top, int end, int bottom) { 15007 resetResolvedPadding(); 15008 15009 mUserPaddingStart = start; 15010 mUserPaddingEnd = end; 15011 15012 switch(getLayoutDirection()) { 15013 case LAYOUT_DIRECTION_RTL: 15014 mUserPaddingLeftInitial = end; 15015 mUserPaddingRightInitial = start; 15016 internalSetPadding(end, top, start, bottom); 15017 break; 15018 case LAYOUT_DIRECTION_LTR: 15019 default: 15020 mUserPaddingLeftInitial = start; 15021 mUserPaddingRightInitial = end; 15022 internalSetPadding(start, top, end, bottom); 15023 } 15024 } 15025 15026 /** 15027 * Returns the top padding of this view. 15028 * 15029 * @return the top padding in pixels 15030 */ 15031 public int getPaddingTop() { 15032 return mPaddingTop; 15033 } 15034 15035 /** 15036 * Returns the bottom padding of this view. If there are inset and enabled 15037 * scrollbars, this value may include the space required to display the 15038 * scrollbars as well. 15039 * 15040 * @return the bottom padding in pixels 15041 */ 15042 public int getPaddingBottom() { 15043 return mPaddingBottom; 15044 } 15045 15046 /** 15047 * Returns the left padding of this view. If there are inset and enabled 15048 * scrollbars, this value may include the space required to display the 15049 * scrollbars as well. 15050 * 15051 * @return the left padding in pixels 15052 */ 15053 public int getPaddingLeft() { 15054 if (!isPaddingResolved()) { 15055 resolvePadding(); 15056 } 15057 return mPaddingLeft; 15058 } 15059 15060 /** 15061 * Returns the start padding of this view depending on its resolved layout direction. 15062 * If there are inset and enabled scrollbars, this value may include the space 15063 * required to display the scrollbars as well. 15064 * 15065 * @return the start padding in pixels 15066 */ 15067 public int getPaddingStart() { 15068 if (!isPaddingResolved()) { 15069 resolvePadding(); 15070 } 15071 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15072 mPaddingRight : mPaddingLeft; 15073 } 15074 15075 /** 15076 * Returns the right padding of this view. If there are inset and enabled 15077 * scrollbars, this value may include the space required to display the 15078 * scrollbars as well. 15079 * 15080 * @return the right padding in pixels 15081 */ 15082 public int getPaddingRight() { 15083 if (!isPaddingResolved()) { 15084 resolvePadding(); 15085 } 15086 return mPaddingRight; 15087 } 15088 15089 /** 15090 * Returns the end padding of this view depending on its resolved layout direction. 15091 * If there are inset and enabled scrollbars, this value may include the space 15092 * required to display the scrollbars as well. 15093 * 15094 * @return the end padding in pixels 15095 */ 15096 public int getPaddingEnd() { 15097 if (!isPaddingResolved()) { 15098 resolvePadding(); 15099 } 15100 return (getLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 15101 mPaddingLeft : mPaddingRight; 15102 } 15103 15104 /** 15105 * Return if the padding as been set thru relative values 15106 * {@link #setPaddingRelative(int, int, int, int)} or thru 15107 * @attr ref android.R.styleable#View_paddingStart or 15108 * @attr ref android.R.styleable#View_paddingEnd 15109 * 15110 * @return true if the padding is relative or false if it is not. 15111 */ 15112 public boolean isPaddingRelative() { 15113 return (mUserPaddingStart != UNDEFINED_PADDING || mUserPaddingEnd != UNDEFINED_PADDING); 15114 } 15115 15116 Insets computeOpticalInsets() { 15117 return (mBackground == null) ? Insets.NONE : mBackground.getOpticalInsets(); 15118 } 15119 15120 /** 15121 * @hide 15122 */ 15123 public void resetPaddingToInitialValues() { 15124 if (isRtlCompatibilityMode()) { 15125 mPaddingLeft = mUserPaddingLeftInitial; 15126 mPaddingRight = mUserPaddingRightInitial; 15127 return; 15128 } 15129 if (isLayoutRtl()) { 15130 mPaddingLeft = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingLeftInitial; 15131 mPaddingRight = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingRightInitial; 15132 } else { 15133 mPaddingLeft = (mUserPaddingStart >= 0) ? mUserPaddingStart : mUserPaddingLeftInitial; 15134 mPaddingRight = (mUserPaddingEnd >= 0) ? mUserPaddingEnd : mUserPaddingRightInitial; 15135 } 15136 } 15137 15138 /** 15139 * @hide 15140 */ 15141 public Insets getOpticalInsets() { 15142 if (mLayoutInsets == null) { 15143 mLayoutInsets = computeOpticalInsets(); 15144 } 15145 return mLayoutInsets; 15146 } 15147 15148 /** 15149 * Changes the selection state of this view. A view can be selected or not. 15150 * Note that selection is not the same as focus. Views are typically 15151 * selected in the context of an AdapterView like ListView or GridView; 15152 * the selected view is the view that is highlighted. 15153 * 15154 * @param selected true if the view must be selected, false otherwise 15155 */ 15156 public void setSelected(boolean selected) { 15157 if (((mPrivateFlags & PFLAG_SELECTED) != 0) != selected) { 15158 mPrivateFlags = (mPrivateFlags & ~PFLAG_SELECTED) | (selected ? PFLAG_SELECTED : 0); 15159 if (!selected) resetPressedState(); 15160 invalidate(true); 15161 refreshDrawableState(); 15162 dispatchSetSelected(selected); 15163 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 15164 notifyAccessibilityStateChanged(); 15165 } 15166 } 15167 } 15168 15169 /** 15170 * Dispatch setSelected to all of this View's children. 15171 * 15172 * @see #setSelected(boolean) 15173 * 15174 * @param selected The new selected state 15175 */ 15176 protected void dispatchSetSelected(boolean selected) { 15177 } 15178 15179 /** 15180 * Indicates the selection state of this view. 15181 * 15182 * @return true if the view is selected, false otherwise 15183 */ 15184 @ViewDebug.ExportedProperty 15185 public boolean isSelected() { 15186 return (mPrivateFlags & PFLAG_SELECTED) != 0; 15187 } 15188 15189 /** 15190 * Changes the activated state of this view. A view can be activated or not. 15191 * Note that activation is not the same as selection. Selection is 15192 * a transient property, representing the view (hierarchy) the user is 15193 * currently interacting with. Activation is a longer-term state that the 15194 * user can move views in and out of. For example, in a list view with 15195 * single or multiple selection enabled, the views in the current selection 15196 * set are activated. (Um, yeah, we are deeply sorry about the terminology 15197 * here.) The activated state is propagated down to children of the view it 15198 * is set on. 15199 * 15200 * @param activated true if the view must be activated, false otherwise 15201 */ 15202 public void setActivated(boolean activated) { 15203 if (((mPrivateFlags & PFLAG_ACTIVATED) != 0) != activated) { 15204 mPrivateFlags = (mPrivateFlags & ~PFLAG_ACTIVATED) | (activated ? PFLAG_ACTIVATED : 0); 15205 invalidate(true); 15206 refreshDrawableState(); 15207 dispatchSetActivated(activated); 15208 } 15209 } 15210 15211 /** 15212 * Dispatch setActivated to all of this View's children. 15213 * 15214 * @see #setActivated(boolean) 15215 * 15216 * @param activated The new activated state 15217 */ 15218 protected void dispatchSetActivated(boolean activated) { 15219 } 15220 15221 /** 15222 * Indicates the activation state of this view. 15223 * 15224 * @return true if the view is activated, false otherwise 15225 */ 15226 @ViewDebug.ExportedProperty 15227 public boolean isActivated() { 15228 return (mPrivateFlags & PFLAG_ACTIVATED) != 0; 15229 } 15230 15231 /** 15232 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 15233 * observer can be used to get notifications when global events, like 15234 * layout, happen. 15235 * 15236 * The returned ViewTreeObserver observer is not guaranteed to remain 15237 * valid for the lifetime of this View. If the caller of this method keeps 15238 * a long-lived reference to ViewTreeObserver, it should always check for 15239 * the return value of {@link ViewTreeObserver#isAlive()}. 15240 * 15241 * @return The ViewTreeObserver for this view's hierarchy. 15242 */ 15243 public ViewTreeObserver getViewTreeObserver() { 15244 if (mAttachInfo != null) { 15245 return mAttachInfo.mTreeObserver; 15246 } 15247 if (mFloatingTreeObserver == null) { 15248 mFloatingTreeObserver = new ViewTreeObserver(); 15249 } 15250 return mFloatingTreeObserver; 15251 } 15252 15253 /** 15254 * <p>Finds the topmost view in the current view hierarchy.</p> 15255 * 15256 * @return the topmost view containing this view 15257 */ 15258 public View getRootView() { 15259 if (mAttachInfo != null) { 15260 final View v = mAttachInfo.mRootView; 15261 if (v != null) { 15262 return v; 15263 } 15264 } 15265 15266 View parent = this; 15267 15268 while (parent.mParent != null && parent.mParent instanceof View) { 15269 parent = (View) parent.mParent; 15270 } 15271 15272 return parent; 15273 } 15274 15275 /** 15276 * <p>Computes the coordinates of this view on the screen. The argument 15277 * must be an array of two integers. After the method returns, the array 15278 * contains the x and y location in that order.</p> 15279 * 15280 * @param location an array of two integers in which to hold the coordinates 15281 */ 15282 public void getLocationOnScreen(int[] location) { 15283 getLocationInWindow(location); 15284 15285 final AttachInfo info = mAttachInfo; 15286 if (info != null) { 15287 location[0] += info.mWindowLeft; 15288 location[1] += info.mWindowTop; 15289 } 15290 } 15291 15292 /** 15293 * <p>Computes the coordinates of this view in its window. The argument 15294 * must be an array of two integers. After the method returns, the array 15295 * contains the x and y location in that order.</p> 15296 * 15297 * @param location an array of two integers in which to hold the coordinates 15298 */ 15299 public void getLocationInWindow(int[] location) { 15300 if (location == null || location.length < 2) { 15301 throw new IllegalArgumentException("location must be an array of two integers"); 15302 } 15303 15304 if (mAttachInfo == null) { 15305 // When the view is not attached to a window, this method does not make sense 15306 location[0] = location[1] = 0; 15307 return; 15308 } 15309 15310 float[] position = mAttachInfo.mTmpTransformLocation; 15311 position[0] = position[1] = 0.0f; 15312 15313 if (!hasIdentityMatrix()) { 15314 getMatrix().mapPoints(position); 15315 } 15316 15317 position[0] += mLeft; 15318 position[1] += mTop; 15319 15320 ViewParent viewParent = mParent; 15321 while (viewParent instanceof View) { 15322 final View view = (View) viewParent; 15323 15324 position[0] -= view.mScrollX; 15325 position[1] -= view.mScrollY; 15326 15327 if (!view.hasIdentityMatrix()) { 15328 view.getMatrix().mapPoints(position); 15329 } 15330 15331 position[0] += view.mLeft; 15332 position[1] += view.mTop; 15333 15334 viewParent = view.mParent; 15335 } 15336 15337 if (viewParent instanceof ViewRootImpl) { 15338 // *cough* 15339 final ViewRootImpl vr = (ViewRootImpl) viewParent; 15340 position[1] -= vr.mCurScrollY; 15341 } 15342 15343 location[0] = (int) (position[0] + 0.5f); 15344 location[1] = (int) (position[1] + 0.5f); 15345 } 15346 15347 /** 15348 * {@hide} 15349 * @param id the id of the view to be found 15350 * @return the view of the specified id, null if cannot be found 15351 */ 15352 protected View findViewTraversal(int id) { 15353 if (id == mID) { 15354 return this; 15355 } 15356 return null; 15357 } 15358 15359 /** 15360 * {@hide} 15361 * @param tag the tag of the view to be found 15362 * @return the view of specified tag, null if cannot be found 15363 */ 15364 protected View findViewWithTagTraversal(Object tag) { 15365 if (tag != null && tag.equals(mTag)) { 15366 return this; 15367 } 15368 return null; 15369 } 15370 15371 /** 15372 * {@hide} 15373 * @param predicate The predicate to evaluate. 15374 * @param childToSkip If not null, ignores this child during the recursive traversal. 15375 * @return The first view that matches the predicate or null. 15376 */ 15377 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 15378 if (predicate.apply(this)) { 15379 return this; 15380 } 15381 return null; 15382 } 15383 15384 /** 15385 * Look for a child view with the given id. If this view has the given 15386 * id, return this view. 15387 * 15388 * @param id The id to search for. 15389 * @return The view that has the given id in the hierarchy or null 15390 */ 15391 public final View findViewById(int id) { 15392 if (id < 0) { 15393 return null; 15394 } 15395 return findViewTraversal(id); 15396 } 15397 15398 /** 15399 * Finds a view by its unuque and stable accessibility id. 15400 * 15401 * @param accessibilityId The searched accessibility id. 15402 * @return The found view. 15403 */ 15404 final View findViewByAccessibilityId(int accessibilityId) { 15405 if (accessibilityId < 0) { 15406 return null; 15407 } 15408 return findViewByAccessibilityIdTraversal(accessibilityId); 15409 } 15410 15411 /** 15412 * Performs the traversal to find a view by its unuque and stable accessibility id. 15413 * 15414 * <strong>Note:</strong>This method does not stop at the root namespace 15415 * boundary since the user can touch the screen at an arbitrary location 15416 * potentially crossing the root namespace bounday which will send an 15417 * accessibility event to accessibility services and they should be able 15418 * to obtain the event source. Also accessibility ids are guaranteed to be 15419 * unique in the window. 15420 * 15421 * @param accessibilityId The accessibility id. 15422 * @return The found view. 15423 */ 15424 View findViewByAccessibilityIdTraversal(int accessibilityId) { 15425 if (getAccessibilityViewId() == accessibilityId) { 15426 return this; 15427 } 15428 return null; 15429 } 15430 15431 /** 15432 * Look for a child view with the given tag. If this view has the given 15433 * tag, return this view. 15434 * 15435 * @param tag The tag to search for, using "tag.equals(getTag())". 15436 * @return The View that has the given tag in the hierarchy or null 15437 */ 15438 public final View findViewWithTag(Object tag) { 15439 if (tag == null) { 15440 return null; 15441 } 15442 return findViewWithTagTraversal(tag); 15443 } 15444 15445 /** 15446 * {@hide} 15447 * Look for a child view that matches the specified predicate. 15448 * If this view matches the predicate, return this view. 15449 * 15450 * @param predicate The predicate to evaluate. 15451 * @return The first view that matches the predicate or null. 15452 */ 15453 public final View findViewByPredicate(Predicate<View> predicate) { 15454 return findViewByPredicateTraversal(predicate, null); 15455 } 15456 15457 /** 15458 * {@hide} 15459 * Look for a child view that matches the specified predicate, 15460 * starting with the specified view and its descendents and then 15461 * recusively searching the ancestors and siblings of that view 15462 * until this view is reached. 15463 * 15464 * This method is useful in cases where the predicate does not match 15465 * a single unique view (perhaps multiple views use the same id) 15466 * and we are trying to find the view that is "closest" in scope to the 15467 * starting view. 15468 * 15469 * @param start The view to start from. 15470 * @param predicate The predicate to evaluate. 15471 * @return The first view that matches the predicate or null. 15472 */ 15473 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 15474 View childToSkip = null; 15475 for (;;) { 15476 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 15477 if (view != null || start == this) { 15478 return view; 15479 } 15480 15481 ViewParent parent = start.getParent(); 15482 if (parent == null || !(parent instanceof View)) { 15483 return null; 15484 } 15485 15486 childToSkip = start; 15487 start = (View) parent; 15488 } 15489 } 15490 15491 /** 15492 * Sets the identifier for this view. The identifier does not have to be 15493 * unique in this view's hierarchy. The identifier should be a positive 15494 * number. 15495 * 15496 * @see #NO_ID 15497 * @see #getId() 15498 * @see #findViewById(int) 15499 * 15500 * @param id a number used to identify the view 15501 * 15502 * @attr ref android.R.styleable#View_id 15503 */ 15504 public void setId(int id) { 15505 mID = id; 15506 if (mID == View.NO_ID && mLabelForId != View.NO_ID) { 15507 mID = generateViewId(); 15508 } 15509 } 15510 15511 /** 15512 * {@hide} 15513 * 15514 * @param isRoot true if the view belongs to the root namespace, false 15515 * otherwise 15516 */ 15517 public void setIsRootNamespace(boolean isRoot) { 15518 if (isRoot) { 15519 mPrivateFlags |= PFLAG_IS_ROOT_NAMESPACE; 15520 } else { 15521 mPrivateFlags &= ~PFLAG_IS_ROOT_NAMESPACE; 15522 } 15523 } 15524 15525 /** 15526 * {@hide} 15527 * 15528 * @return true if the view belongs to the root namespace, false otherwise 15529 */ 15530 public boolean isRootNamespace() { 15531 return (mPrivateFlags&PFLAG_IS_ROOT_NAMESPACE) != 0; 15532 } 15533 15534 /** 15535 * Returns this view's identifier. 15536 * 15537 * @return a positive integer used to identify the view or {@link #NO_ID} 15538 * if the view has no ID 15539 * 15540 * @see #setId(int) 15541 * @see #findViewById(int) 15542 * @attr ref android.R.styleable#View_id 15543 */ 15544 @ViewDebug.CapturedViewProperty 15545 public int getId() { 15546 return mID; 15547 } 15548 15549 /** 15550 * Returns this view's tag. 15551 * 15552 * @return the Object stored in this view as a tag 15553 * 15554 * @see #setTag(Object) 15555 * @see #getTag(int) 15556 */ 15557 @ViewDebug.ExportedProperty 15558 public Object getTag() { 15559 return mTag; 15560 } 15561 15562 /** 15563 * Sets the tag associated with this view. A tag can be used to mark 15564 * a view in its hierarchy and does not have to be unique within the 15565 * hierarchy. Tags can also be used to store data within a view without 15566 * resorting to another data structure. 15567 * 15568 * @param tag an Object to tag the view with 15569 * 15570 * @see #getTag() 15571 * @see #setTag(int, Object) 15572 */ 15573 public void setTag(final Object tag) { 15574 mTag = tag; 15575 } 15576 15577 /** 15578 * Returns the tag associated with this view and the specified key. 15579 * 15580 * @param key The key identifying the tag 15581 * 15582 * @return the Object stored in this view as a tag 15583 * 15584 * @see #setTag(int, Object) 15585 * @see #getTag() 15586 */ 15587 public Object getTag(int key) { 15588 if (mKeyedTags != null) return mKeyedTags.get(key); 15589 return null; 15590 } 15591 15592 /** 15593 * Sets a tag associated with this view and a key. A tag can be used 15594 * to mark a view in its hierarchy and does not have to be unique within 15595 * the hierarchy. Tags can also be used to store data within a view 15596 * without resorting to another data structure. 15597 * 15598 * The specified key should be an id declared in the resources of the 15599 * application to ensure it is unique (see the <a 15600 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 15601 * Keys identified as belonging to 15602 * the Android framework or not associated with any package will cause 15603 * an {@link IllegalArgumentException} to be thrown. 15604 * 15605 * @param key The key identifying the tag 15606 * @param tag An Object to tag the view with 15607 * 15608 * @throws IllegalArgumentException If they specified key is not valid 15609 * 15610 * @see #setTag(Object) 15611 * @see #getTag(int) 15612 */ 15613 public void setTag(int key, final Object tag) { 15614 // If the package id is 0x00 or 0x01, it's either an undefined package 15615 // or a framework id 15616 if ((key >>> 24) < 2) { 15617 throw new IllegalArgumentException("The key must be an application-specific " 15618 + "resource id."); 15619 } 15620 15621 setKeyedTag(key, tag); 15622 } 15623 15624 /** 15625 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 15626 * framework id. 15627 * 15628 * @hide 15629 */ 15630 public void setTagInternal(int key, Object tag) { 15631 if ((key >>> 24) != 0x1) { 15632 throw new IllegalArgumentException("The key must be a framework-specific " 15633 + "resource id."); 15634 } 15635 15636 setKeyedTag(key, tag); 15637 } 15638 15639 private void setKeyedTag(int key, Object tag) { 15640 if (mKeyedTags == null) { 15641 mKeyedTags = new SparseArray<Object>(); 15642 } 15643 15644 mKeyedTags.put(key, tag); 15645 } 15646 15647 /** 15648 * Prints information about this view in the log output, with the tag 15649 * {@link #VIEW_LOG_TAG}. 15650 * 15651 * @hide 15652 */ 15653 public void debug() { 15654 debug(0); 15655 } 15656 15657 /** 15658 * Prints information about this view in the log output, with the tag 15659 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 15660 * indentation defined by the <code>depth</code>. 15661 * 15662 * @param depth the indentation level 15663 * 15664 * @hide 15665 */ 15666 protected void debug(int depth) { 15667 String output = debugIndent(depth - 1); 15668 15669 output += "+ " + this; 15670 int id = getId(); 15671 if (id != -1) { 15672 output += " (id=" + id + ")"; 15673 } 15674 Object tag = getTag(); 15675 if (tag != null) { 15676 output += " (tag=" + tag + ")"; 15677 } 15678 Log.d(VIEW_LOG_TAG, output); 15679 15680 if ((mPrivateFlags & PFLAG_FOCUSED) != 0) { 15681 output = debugIndent(depth) + " FOCUSED"; 15682 Log.d(VIEW_LOG_TAG, output); 15683 } 15684 15685 output = debugIndent(depth); 15686 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 15687 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 15688 + "} "; 15689 Log.d(VIEW_LOG_TAG, output); 15690 15691 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 15692 || mPaddingBottom != 0) { 15693 output = debugIndent(depth); 15694 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 15695 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 15696 Log.d(VIEW_LOG_TAG, output); 15697 } 15698 15699 output = debugIndent(depth); 15700 output += "mMeasureWidth=" + mMeasuredWidth + 15701 " mMeasureHeight=" + mMeasuredHeight; 15702 Log.d(VIEW_LOG_TAG, output); 15703 15704 output = debugIndent(depth); 15705 if (mLayoutParams == null) { 15706 output += "BAD! no layout params"; 15707 } else { 15708 output = mLayoutParams.debug(output); 15709 } 15710 Log.d(VIEW_LOG_TAG, output); 15711 15712 output = debugIndent(depth); 15713 output += "flags={"; 15714 output += View.printFlags(mViewFlags); 15715 output += "}"; 15716 Log.d(VIEW_LOG_TAG, output); 15717 15718 output = debugIndent(depth); 15719 output += "privateFlags={"; 15720 output += View.printPrivateFlags(mPrivateFlags); 15721 output += "}"; 15722 Log.d(VIEW_LOG_TAG, output); 15723 } 15724 15725 /** 15726 * Creates a string of whitespaces used for indentation. 15727 * 15728 * @param depth the indentation level 15729 * @return a String containing (depth * 2 + 3) * 2 white spaces 15730 * 15731 * @hide 15732 */ 15733 protected static String debugIndent(int depth) { 15734 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 15735 for (int i = 0; i < (depth * 2) + 3; i++) { 15736 spaces.append(' ').append(' '); 15737 } 15738 return spaces.toString(); 15739 } 15740 15741 /** 15742 * <p>Return the offset of the widget's text baseline from the widget's top 15743 * boundary. If this widget does not support baseline alignment, this 15744 * method returns -1. </p> 15745 * 15746 * @return the offset of the baseline within the widget's bounds or -1 15747 * if baseline alignment is not supported 15748 */ 15749 @ViewDebug.ExportedProperty(category = "layout") 15750 public int getBaseline() { 15751 return -1; 15752 } 15753 15754 /** 15755 * Returns whether the view hierarchy is currently undergoing a layout pass. This 15756 * information is useful to avoid situations such as calling {@link #requestLayout()} during 15757 * a layout pass. 15758 * 15759 * @return whether the view hierarchy is currently undergoing a layout pass 15760 */ 15761 public boolean isInLayout() { 15762 ViewRootImpl viewRoot = getViewRootImpl(); 15763 return (viewRoot != null && viewRoot.isInLayout()); 15764 } 15765 15766 /** 15767 * Call this when something has changed which has invalidated the 15768 * layout of this view. This will schedule a layout pass of the view 15769 * tree. This should not be called while the view hierarchy is currently in a layout 15770 * pass ({@link #isInLayout()}. If layout is happening, the request may be honored at the 15771 * end of the current layout pass (and then layout will run again) or after the current 15772 * frame is drawn and the next layout occurs. 15773 * 15774 * <p>Subclasses which override this method should call the superclass method to 15775 * handle possible request-during-layout errors correctly.</p> 15776 */ 15777 public void requestLayout() { 15778 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == null) { 15779 // Only trigger request-during-layout logic if this is the view requesting it, 15780 // not the views in its parent hierarchy 15781 ViewRootImpl viewRoot = getViewRootImpl(); 15782 if (viewRoot != null && viewRoot.isInLayout()) { 15783 if (!viewRoot.requestLayoutDuringLayout(this)) { 15784 return; 15785 } 15786 } 15787 mAttachInfo.mViewRequestingLayout = this; 15788 } 15789 15790 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15791 mPrivateFlags |= PFLAG_INVALIDATED; 15792 15793 if (mParent != null && !mParent.isLayoutRequested()) { 15794 mParent.requestLayout(); 15795 } 15796 if (mAttachInfo != null && mAttachInfo.mViewRequestingLayout == this) { 15797 mAttachInfo.mViewRequestingLayout = null; 15798 } 15799 } 15800 15801 /** 15802 * Forces this view to be laid out during the next layout pass. 15803 * This method does not call requestLayout() or forceLayout() 15804 * on the parent. 15805 */ 15806 public void forceLayout() { 15807 mPrivateFlags |= PFLAG_FORCE_LAYOUT; 15808 mPrivateFlags |= PFLAG_INVALIDATED; 15809 } 15810 15811 /** 15812 * <p> 15813 * This is called to find out how big a view should be. The parent 15814 * supplies constraint information in the width and height parameters. 15815 * </p> 15816 * 15817 * <p> 15818 * The actual measurement work of a view is performed in 15819 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 15820 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 15821 * </p> 15822 * 15823 * 15824 * @param widthMeasureSpec Horizontal space requirements as imposed by the 15825 * parent 15826 * @param heightMeasureSpec Vertical space requirements as imposed by the 15827 * parent 15828 * 15829 * @see #onMeasure(int, int) 15830 */ 15831 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 15832 boolean optical = isLayoutModeOptical(this); 15833 if (optical != isLayoutModeOptical(mParent)) { 15834 Insets insets = getOpticalInsets(); 15835 int oWidth = insets.left + insets.right; 15836 int oHeight = insets.top + insets.bottom; 15837 widthMeasureSpec = MeasureSpec.adjust(widthMeasureSpec, optical ? -oWidth : oWidth); 15838 heightMeasureSpec = MeasureSpec.adjust(heightMeasureSpec, optical ? -oHeight : oHeight); 15839 } 15840 if ((mPrivateFlags & PFLAG_FORCE_LAYOUT) == PFLAG_FORCE_LAYOUT || 15841 widthMeasureSpec != mOldWidthMeasureSpec || 15842 heightMeasureSpec != mOldHeightMeasureSpec) { 15843 15844 // first clears the measured dimension flag 15845 mPrivateFlags &= ~PFLAG_MEASURED_DIMENSION_SET; 15846 15847 resolveRtlPropertiesIfNeeded(); 15848 15849 // measure ourselves, this should set the measured dimension flag back 15850 onMeasure(widthMeasureSpec, heightMeasureSpec); 15851 15852 // flag not set, setMeasuredDimension() was not invoked, we raise 15853 // an exception to warn the developer 15854 if ((mPrivateFlags & PFLAG_MEASURED_DIMENSION_SET) != PFLAG_MEASURED_DIMENSION_SET) { 15855 throw new IllegalStateException("onMeasure() did not set the" 15856 + " measured dimension by calling" 15857 + " setMeasuredDimension()"); 15858 } 15859 15860 mPrivateFlags |= PFLAG_LAYOUT_REQUIRED; 15861 } 15862 15863 mOldWidthMeasureSpec = widthMeasureSpec; 15864 mOldHeightMeasureSpec = heightMeasureSpec; 15865 } 15866 15867 /** 15868 * <p> 15869 * Measure the view and its content to determine the measured width and the 15870 * measured height. This method is invoked by {@link #measure(int, int)} and 15871 * should be overriden by subclasses to provide accurate and efficient 15872 * measurement of their contents. 15873 * </p> 15874 * 15875 * <p> 15876 * <strong>CONTRACT:</strong> When overriding this method, you 15877 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15878 * measured width and height of this view. Failure to do so will trigger an 15879 * <code>IllegalStateException</code>, thrown by 15880 * {@link #measure(int, int)}. Calling the superclass' 15881 * {@link #onMeasure(int, int)} is a valid use. 15882 * </p> 15883 * 15884 * <p> 15885 * The base class implementation of measure defaults to the background size, 15886 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15887 * override {@link #onMeasure(int, int)} to provide better measurements of 15888 * their content. 15889 * </p> 15890 * 15891 * <p> 15892 * If this method is overridden, it is the subclass's responsibility to make 15893 * sure the measured height and width are at least the view's minimum height 15894 * and width ({@link #getSuggestedMinimumHeight()} and 15895 * {@link #getSuggestedMinimumWidth()}). 15896 * </p> 15897 * 15898 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15899 * The requirements are encoded with 15900 * {@link android.view.View.MeasureSpec}. 15901 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15902 * The requirements are encoded with 15903 * {@link android.view.View.MeasureSpec}. 15904 * 15905 * @see #getMeasuredWidth() 15906 * @see #getMeasuredHeight() 15907 * @see #setMeasuredDimension(int, int) 15908 * @see #getSuggestedMinimumHeight() 15909 * @see #getSuggestedMinimumWidth() 15910 * @see android.view.View.MeasureSpec#getMode(int) 15911 * @see android.view.View.MeasureSpec#getSize(int) 15912 */ 15913 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15914 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15915 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15916 } 15917 15918 /** 15919 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15920 * measured width and measured height. Failing to do so will trigger an 15921 * exception at measurement time.</p> 15922 * 15923 * @param measuredWidth The measured width of this view. May be a complex 15924 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15925 * {@link #MEASURED_STATE_TOO_SMALL}. 15926 * @param measuredHeight The measured height of this view. May be a complex 15927 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15928 * {@link #MEASURED_STATE_TOO_SMALL}. 15929 */ 15930 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15931 boolean optical = isLayoutModeOptical(this); 15932 if (optical != isLayoutModeOptical(mParent)) { 15933 Insets insets = getOpticalInsets(); 15934 int opticalWidth = insets.left + insets.right; 15935 int opticalHeight = insets.top + insets.bottom; 15936 15937 measuredWidth += optical ? opticalWidth : -opticalWidth; 15938 measuredHeight += optical ? opticalHeight : -opticalHeight; 15939 } 15940 mMeasuredWidth = measuredWidth; 15941 mMeasuredHeight = measuredHeight; 15942 15943 mPrivateFlags |= PFLAG_MEASURED_DIMENSION_SET; 15944 } 15945 15946 /** 15947 * Merge two states as returned by {@link #getMeasuredState()}. 15948 * @param curState The current state as returned from a view or the result 15949 * of combining multiple views. 15950 * @param newState The new view state to combine. 15951 * @return Returns a new integer reflecting the combination of the two 15952 * states. 15953 */ 15954 public static int combineMeasuredStates(int curState, int newState) { 15955 return curState | newState; 15956 } 15957 15958 /** 15959 * Version of {@link #resolveSizeAndState(int, int, int)} 15960 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15961 */ 15962 public static int resolveSize(int size, int measureSpec) { 15963 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15964 } 15965 15966 /** 15967 * Utility to reconcile a desired size and state, with constraints imposed 15968 * by a MeasureSpec. Will take the desired size, unless a different size 15969 * is imposed by the constraints. The returned value is a compound integer, 15970 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15971 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15972 * size is smaller than the size the view wants to be. 15973 * 15974 * @param size How big the view wants to be 15975 * @param measureSpec Constraints imposed by the parent 15976 * @return Size information bit mask as defined by 15977 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15978 */ 15979 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15980 int result = size; 15981 int specMode = MeasureSpec.getMode(measureSpec); 15982 int specSize = MeasureSpec.getSize(measureSpec); 15983 switch (specMode) { 15984 case MeasureSpec.UNSPECIFIED: 15985 result = size; 15986 break; 15987 case MeasureSpec.AT_MOST: 15988 if (specSize < size) { 15989 result = specSize | MEASURED_STATE_TOO_SMALL; 15990 } else { 15991 result = size; 15992 } 15993 break; 15994 case MeasureSpec.EXACTLY: 15995 result = specSize; 15996 break; 15997 } 15998 return result | (childMeasuredState&MEASURED_STATE_MASK); 15999 } 16000 16001 /** 16002 * Utility to return a default size. Uses the supplied size if the 16003 * MeasureSpec imposed no constraints. Will get larger if allowed 16004 * by the MeasureSpec. 16005 * 16006 * @param size Default size for this view 16007 * @param measureSpec Constraints imposed by the parent 16008 * @return The size this view should be. 16009 */ 16010 public static int getDefaultSize(int size, int measureSpec) { 16011 int result = size; 16012 int specMode = MeasureSpec.getMode(measureSpec); 16013 int specSize = MeasureSpec.getSize(measureSpec); 16014 16015 switch (specMode) { 16016 case MeasureSpec.UNSPECIFIED: 16017 result = size; 16018 break; 16019 case MeasureSpec.AT_MOST: 16020 case MeasureSpec.EXACTLY: 16021 result = specSize; 16022 break; 16023 } 16024 return result; 16025 } 16026 16027 /** 16028 * Returns the suggested minimum height that the view should use. This 16029 * returns the maximum of the view's minimum height 16030 * and the background's minimum height 16031 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 16032 * <p> 16033 * When being used in {@link #onMeasure(int, int)}, the caller should still 16034 * ensure the returned height is within the requirements of the parent. 16035 * 16036 * @return The suggested minimum height of the view. 16037 */ 16038 protected int getSuggestedMinimumHeight() { 16039 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 16040 16041 } 16042 16043 /** 16044 * Returns the suggested minimum width that the view should use. This 16045 * returns the maximum of the view's minimum width) 16046 * and the background's minimum width 16047 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 16048 * <p> 16049 * When being used in {@link #onMeasure(int, int)}, the caller should still 16050 * ensure the returned width is within the requirements of the parent. 16051 * 16052 * @return The suggested minimum width of the view. 16053 */ 16054 protected int getSuggestedMinimumWidth() { 16055 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 16056 } 16057 16058 /** 16059 * Returns the minimum height of the view. 16060 * 16061 * @return the minimum height the view will try to be. 16062 * 16063 * @see #setMinimumHeight(int) 16064 * 16065 * @attr ref android.R.styleable#View_minHeight 16066 */ 16067 public int getMinimumHeight() { 16068 return mMinHeight; 16069 } 16070 16071 /** 16072 * Sets the minimum height of the view. It is not guaranteed the view will 16073 * be able to achieve this minimum height (for example, if its parent layout 16074 * constrains it with less available height). 16075 * 16076 * @param minHeight The minimum height the view will try to be. 16077 * 16078 * @see #getMinimumHeight() 16079 * 16080 * @attr ref android.R.styleable#View_minHeight 16081 */ 16082 public void setMinimumHeight(int minHeight) { 16083 mMinHeight = minHeight; 16084 requestLayout(); 16085 } 16086 16087 /** 16088 * Returns the minimum width of the view. 16089 * 16090 * @return the minimum width the view will try to be. 16091 * 16092 * @see #setMinimumWidth(int) 16093 * 16094 * @attr ref android.R.styleable#View_minWidth 16095 */ 16096 public int getMinimumWidth() { 16097 return mMinWidth; 16098 } 16099 16100 /** 16101 * Sets the minimum width of the view. It is not guaranteed the view will 16102 * be able to achieve this minimum width (for example, if its parent layout 16103 * constrains it with less available width). 16104 * 16105 * @param minWidth The minimum width the view will try to be. 16106 * 16107 * @see #getMinimumWidth() 16108 * 16109 * @attr ref android.R.styleable#View_minWidth 16110 */ 16111 public void setMinimumWidth(int minWidth) { 16112 mMinWidth = minWidth; 16113 requestLayout(); 16114 16115 } 16116 16117 /** 16118 * Get the animation currently associated with this view. 16119 * 16120 * @return The animation that is currently playing or 16121 * scheduled to play for this view. 16122 */ 16123 public Animation getAnimation() { 16124 return mCurrentAnimation; 16125 } 16126 16127 /** 16128 * Start the specified animation now. 16129 * 16130 * @param animation the animation to start now 16131 */ 16132 public void startAnimation(Animation animation) { 16133 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 16134 setAnimation(animation); 16135 invalidateParentCaches(); 16136 invalidate(true); 16137 } 16138 16139 /** 16140 * Cancels any animations for this view. 16141 */ 16142 public void clearAnimation() { 16143 if (mCurrentAnimation != null) { 16144 mCurrentAnimation.detach(); 16145 } 16146 mCurrentAnimation = null; 16147 invalidateParentIfNeeded(); 16148 } 16149 16150 /** 16151 * Sets the next animation to play for this view. 16152 * If you want the animation to play immediately, use 16153 * {@link #startAnimation(android.view.animation.Animation)} instead. 16154 * This method provides allows fine-grained 16155 * control over the start time and invalidation, but you 16156 * must make sure that 1) the animation has a start time set, and 16157 * 2) the view's parent (which controls animations on its children) 16158 * will be invalidated when the animation is supposed to 16159 * start. 16160 * 16161 * @param animation The next animation, or null. 16162 */ 16163 public void setAnimation(Animation animation) { 16164 mCurrentAnimation = animation; 16165 16166 if (animation != null) { 16167 // If the screen is off assume the animation start time is now instead of 16168 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 16169 // would cause the animation to start when the screen turns back on 16170 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 16171 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 16172 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 16173 } 16174 animation.reset(); 16175 } 16176 } 16177 16178 /** 16179 * Invoked by a parent ViewGroup to notify the start of the animation 16180 * currently associated with this view. If you override this method, 16181 * always call super.onAnimationStart(); 16182 * 16183 * @see #setAnimation(android.view.animation.Animation) 16184 * @see #getAnimation() 16185 */ 16186 protected void onAnimationStart() { 16187 mPrivateFlags |= PFLAG_ANIMATION_STARTED; 16188 } 16189 16190 /** 16191 * Invoked by a parent ViewGroup to notify the end of the animation 16192 * currently associated with this view. If you override this method, 16193 * always call super.onAnimationEnd(); 16194 * 16195 * @see #setAnimation(android.view.animation.Animation) 16196 * @see #getAnimation() 16197 */ 16198 protected void onAnimationEnd() { 16199 mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 16200 } 16201 16202 /** 16203 * Invoked if there is a Transform that involves alpha. Subclass that can 16204 * draw themselves with the specified alpha should return true, and then 16205 * respect that alpha when their onDraw() is called. If this returns false 16206 * then the view may be redirected to draw into an offscreen buffer to 16207 * fulfill the request, which will look fine, but may be slower than if the 16208 * subclass handles it internally. The default implementation returns false. 16209 * 16210 * @param alpha The alpha (0..255) to apply to the view's drawing 16211 * @return true if the view can draw with the specified alpha. 16212 */ 16213 protected boolean onSetAlpha(int alpha) { 16214 return false; 16215 } 16216 16217 /** 16218 * This is used by the RootView to perform an optimization when 16219 * the view hierarchy contains one or several SurfaceView. 16220 * SurfaceView is always considered transparent, but its children are not, 16221 * therefore all View objects remove themselves from the global transparent 16222 * region (passed as a parameter to this function). 16223 * 16224 * @param region The transparent region for this ViewAncestor (window). 16225 * 16226 * @return Returns true if the effective visibility of the view at this 16227 * point is opaque, regardless of the transparent region; returns false 16228 * if it is possible for underlying windows to be seen behind the view. 16229 * 16230 * {@hide} 16231 */ 16232 public boolean gatherTransparentRegion(Region region) { 16233 final AttachInfo attachInfo = mAttachInfo; 16234 if (region != null && attachInfo != null) { 16235 final int pflags = mPrivateFlags; 16236 if ((pflags & PFLAG_SKIP_DRAW) == 0) { 16237 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 16238 // remove it from the transparent region. 16239 final int[] location = attachInfo.mTransparentLocation; 16240 getLocationInWindow(location); 16241 region.op(location[0], location[1], location[0] + mRight - mLeft, 16242 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 16243 } else if ((pflags & PFLAG_ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 16244 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 16245 // exists, so we remove the background drawable's non-transparent 16246 // parts from this transparent region. 16247 applyDrawableToTransparentRegion(mBackground, region); 16248 } 16249 } 16250 return true; 16251 } 16252 16253 /** 16254 * Play a sound effect for this view. 16255 * 16256 * <p>The framework will play sound effects for some built in actions, such as 16257 * clicking, but you may wish to play these effects in your widget, 16258 * for instance, for internal navigation. 16259 * 16260 * <p>The sound effect will only be played if sound effects are enabled by the user, and 16261 * {@link #isSoundEffectsEnabled()} is true. 16262 * 16263 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 16264 */ 16265 public void playSoundEffect(int soundConstant) { 16266 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 16267 return; 16268 } 16269 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 16270 } 16271 16272 /** 16273 * BZZZTT!!1! 16274 * 16275 * <p>Provide haptic feedback to the user for this view. 16276 * 16277 * <p>The framework will provide haptic feedback for some built in actions, 16278 * such as long presses, but you may wish to provide feedback for your 16279 * own widget. 16280 * 16281 * <p>The feedback will only be performed if 16282 * {@link #isHapticFeedbackEnabled()} is true. 16283 * 16284 * @param feedbackConstant One of the constants defined in 16285 * {@link HapticFeedbackConstants} 16286 */ 16287 public boolean performHapticFeedback(int feedbackConstant) { 16288 return performHapticFeedback(feedbackConstant, 0); 16289 } 16290 16291 /** 16292 * BZZZTT!!1! 16293 * 16294 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 16295 * 16296 * @param feedbackConstant One of the constants defined in 16297 * {@link HapticFeedbackConstants} 16298 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 16299 */ 16300 public boolean performHapticFeedback(int feedbackConstant, int flags) { 16301 if (mAttachInfo == null) { 16302 return false; 16303 } 16304 //noinspection SimplifiableIfStatement 16305 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 16306 && !isHapticFeedbackEnabled()) { 16307 return false; 16308 } 16309 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 16310 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 16311 } 16312 16313 /** 16314 * Request that the visibility of the status bar or other screen/window 16315 * decorations be changed. 16316 * 16317 * <p>This method is used to put the over device UI into temporary modes 16318 * where the user's attention is focused more on the application content, 16319 * by dimming or hiding surrounding system affordances. This is typically 16320 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 16321 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 16322 * to be placed behind the action bar (and with these flags other system 16323 * affordances) so that smooth transitions between hiding and showing them 16324 * can be done. 16325 * 16326 * <p>Two representative examples of the use of system UI visibility is 16327 * implementing a content browsing application (like a magazine reader) 16328 * and a video playing application. 16329 * 16330 * <p>The first code shows a typical implementation of a View in a content 16331 * browsing application. In this implementation, the application goes 16332 * into a content-oriented mode by hiding the status bar and action bar, 16333 * and putting the navigation elements into lights out mode. The user can 16334 * then interact with content while in this mode. Such an application should 16335 * provide an easy way for the user to toggle out of the mode (such as to 16336 * check information in the status bar or access notifications). In the 16337 * implementation here, this is done simply by tapping on the content. 16338 * 16339 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 16340 * content} 16341 * 16342 * <p>This second code sample shows a typical implementation of a View 16343 * in a video playing application. In this situation, while the video is 16344 * playing the application would like to go into a complete full-screen mode, 16345 * to use as much of the display as possible for the video. When in this state 16346 * the user can not interact with the application; the system intercepts 16347 * touching on the screen to pop the UI out of full screen mode. See 16348 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 16349 * 16350 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 16351 * content} 16352 * 16353 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16354 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16355 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16356 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16357 */ 16358 public void setSystemUiVisibility(int visibility) { 16359 if (visibility != mSystemUiVisibility) { 16360 mSystemUiVisibility = visibility; 16361 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16362 mParent.recomputeViewAttributes(this); 16363 } 16364 } 16365 } 16366 16367 /** 16368 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 16369 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 16370 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 16371 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 16372 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 16373 */ 16374 public int getSystemUiVisibility() { 16375 return mSystemUiVisibility; 16376 } 16377 16378 /** 16379 * Returns the current system UI visibility that is currently set for 16380 * the entire window. This is the combination of the 16381 * {@link #setSystemUiVisibility(int)} values supplied by all of the 16382 * views in the window. 16383 */ 16384 public int getWindowSystemUiVisibility() { 16385 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 16386 } 16387 16388 /** 16389 * Override to find out when the window's requested system UI visibility 16390 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 16391 * This is different from the callbacks recieved through 16392 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 16393 * in that this is only telling you about the local request of the window, 16394 * not the actual values applied by the system. 16395 */ 16396 public void onWindowSystemUiVisibilityChanged(int visible) { 16397 } 16398 16399 /** 16400 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 16401 * the view hierarchy. 16402 */ 16403 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 16404 onWindowSystemUiVisibilityChanged(visible); 16405 } 16406 16407 /** 16408 * Set a listener to receive callbacks when the visibility of the system bar changes. 16409 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 16410 */ 16411 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 16412 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 16413 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 16414 mParent.recomputeViewAttributes(this); 16415 } 16416 } 16417 16418 /** 16419 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 16420 * the view hierarchy. 16421 */ 16422 public void dispatchSystemUiVisibilityChanged(int visibility) { 16423 ListenerInfo li = mListenerInfo; 16424 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 16425 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 16426 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 16427 } 16428 } 16429 16430 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 16431 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 16432 if (val != mSystemUiVisibility) { 16433 setSystemUiVisibility(val); 16434 return true; 16435 } 16436 return false; 16437 } 16438 16439 /** @hide */ 16440 public void setDisabledSystemUiVisibility(int flags) { 16441 if (mAttachInfo != null) { 16442 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 16443 mAttachInfo.mDisabledSystemUiVisibility = flags; 16444 if (mParent != null) { 16445 mParent.recomputeViewAttributes(this); 16446 } 16447 } 16448 } 16449 } 16450 16451 /** 16452 * Creates an image that the system displays during the drag and drop 16453 * operation. This is called a "drag shadow". The default implementation 16454 * for a DragShadowBuilder based on a View returns an image that has exactly the same 16455 * appearance as the given View. The default also positions the center of the drag shadow 16456 * directly under the touch point. If no View is provided (the constructor with no parameters 16457 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 16458 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 16459 * default is an invisible drag shadow. 16460 * <p> 16461 * You are not required to use the View you provide to the constructor as the basis of the 16462 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 16463 * anything you want as the drag shadow. 16464 * </p> 16465 * <p> 16466 * You pass a DragShadowBuilder object to the system when you start the drag. The system 16467 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 16468 * size and position of the drag shadow. It uses this data to construct a 16469 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 16470 * so that your application can draw the shadow image in the Canvas. 16471 * </p> 16472 * 16473 * <div class="special reference"> 16474 * <h3>Developer Guides</h3> 16475 * <p>For a guide to implementing drag and drop features, read the 16476 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16477 * </div> 16478 */ 16479 public static class DragShadowBuilder { 16480 private final WeakReference<View> mView; 16481 16482 /** 16483 * Constructs a shadow image builder based on a View. By default, the resulting drag 16484 * shadow will have the same appearance and dimensions as the View, with the touch point 16485 * over the center of the View. 16486 * @param view A View. Any View in scope can be used. 16487 */ 16488 public DragShadowBuilder(View view) { 16489 mView = new WeakReference<View>(view); 16490 } 16491 16492 /** 16493 * Construct a shadow builder object with no associated View. This 16494 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 16495 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 16496 * to supply the drag shadow's dimensions and appearance without 16497 * reference to any View object. If they are not overridden, then the result is an 16498 * invisible drag shadow. 16499 */ 16500 public DragShadowBuilder() { 16501 mView = new WeakReference<View>(null); 16502 } 16503 16504 /** 16505 * Returns the View object that had been passed to the 16506 * {@link #View.DragShadowBuilder(View)} 16507 * constructor. If that View parameter was {@code null} or if the 16508 * {@link #View.DragShadowBuilder()} 16509 * constructor was used to instantiate the builder object, this method will return 16510 * null. 16511 * 16512 * @return The View object associate with this builder object. 16513 */ 16514 @SuppressWarnings({"JavadocReference"}) 16515 final public View getView() { 16516 return mView.get(); 16517 } 16518 16519 /** 16520 * Provides the metrics for the shadow image. These include the dimensions of 16521 * the shadow image, and the point within that shadow that should 16522 * be centered under the touch location while dragging. 16523 * <p> 16524 * The default implementation sets the dimensions of the shadow to be the 16525 * same as the dimensions of the View itself and centers the shadow under 16526 * the touch point. 16527 * </p> 16528 * 16529 * @param shadowSize A {@link android.graphics.Point} containing the width and height 16530 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 16531 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 16532 * image. 16533 * 16534 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 16535 * shadow image that should be underneath the touch point during the drag and drop 16536 * operation. Your application must set {@link android.graphics.Point#x} to the 16537 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 16538 */ 16539 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 16540 final View view = mView.get(); 16541 if (view != null) { 16542 shadowSize.set(view.getWidth(), view.getHeight()); 16543 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 16544 } else { 16545 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 16546 } 16547 } 16548 16549 /** 16550 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 16551 * based on the dimensions it received from the 16552 * {@link #onProvideShadowMetrics(Point, Point)} callback. 16553 * 16554 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 16555 */ 16556 public void onDrawShadow(Canvas canvas) { 16557 final View view = mView.get(); 16558 if (view != null) { 16559 view.draw(canvas); 16560 } else { 16561 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 16562 } 16563 } 16564 } 16565 16566 /** 16567 * Starts a drag and drop operation. When your application calls this method, it passes a 16568 * {@link android.view.View.DragShadowBuilder} object to the system. The 16569 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 16570 * to get metrics for the drag shadow, and then calls the object's 16571 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 16572 * <p> 16573 * Once the system has the drag shadow, it begins the drag and drop operation by sending 16574 * drag events to all the View objects in your application that are currently visible. It does 16575 * this either by calling the View object's drag listener (an implementation of 16576 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 16577 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 16578 * Both are passed a {@link android.view.DragEvent} object that has a 16579 * {@link android.view.DragEvent#getAction()} value of 16580 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 16581 * </p> 16582 * <p> 16583 * Your application can invoke startDrag() on any attached View object. The View object does not 16584 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 16585 * be related to the View the user selected for dragging. 16586 * </p> 16587 * @param data A {@link android.content.ClipData} object pointing to the data to be 16588 * transferred by the drag and drop operation. 16589 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 16590 * drag shadow. 16591 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 16592 * drop operation. This Object is put into every DragEvent object sent by the system during the 16593 * current drag. 16594 * <p> 16595 * myLocalState is a lightweight mechanism for the sending information from the dragged View 16596 * to the target Views. For example, it can contain flags that differentiate between a 16597 * a copy operation and a move operation. 16598 * </p> 16599 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 16600 * so the parameter should be set to 0. 16601 * @return {@code true} if the method completes successfully, or 16602 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 16603 * do a drag, and so no drag operation is in progress. 16604 */ 16605 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 16606 Object myLocalState, int flags) { 16607 if (ViewDebug.DEBUG_DRAG) { 16608 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 16609 } 16610 boolean okay = false; 16611 16612 Point shadowSize = new Point(); 16613 Point shadowTouchPoint = new Point(); 16614 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 16615 16616 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 16617 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 16618 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 16619 } 16620 16621 if (ViewDebug.DEBUG_DRAG) { 16622 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 16623 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 16624 } 16625 Surface surface = new Surface(); 16626 try { 16627 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 16628 flags, shadowSize.x, shadowSize.y, surface); 16629 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 16630 + " surface=" + surface); 16631 if (token != null) { 16632 Canvas canvas = surface.lockCanvas(null); 16633 try { 16634 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 16635 shadowBuilder.onDrawShadow(canvas); 16636 } finally { 16637 surface.unlockCanvasAndPost(canvas); 16638 } 16639 16640 final ViewRootImpl root = getViewRootImpl(); 16641 16642 // Cache the local state object for delivery with DragEvents 16643 root.setLocalDragState(myLocalState); 16644 16645 // repurpose 'shadowSize' for the last touch point 16646 root.getLastTouchPoint(shadowSize); 16647 16648 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 16649 shadowSize.x, shadowSize.y, 16650 shadowTouchPoint.x, shadowTouchPoint.y, data); 16651 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 16652 16653 // Off and running! Release our local surface instance; the drag 16654 // shadow surface is now managed by the system process. 16655 surface.release(); 16656 } 16657 } catch (Exception e) { 16658 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 16659 surface.destroy(); 16660 } 16661 16662 return okay; 16663 } 16664 16665 /** 16666 * Handles drag events sent by the system following a call to 16667 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 16668 *<p> 16669 * When the system calls this method, it passes a 16670 * {@link android.view.DragEvent} object. A call to 16671 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 16672 * in DragEvent. The method uses these to determine what is happening in the drag and drop 16673 * operation. 16674 * @param event The {@link android.view.DragEvent} sent by the system. 16675 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 16676 * in DragEvent, indicating the type of drag event represented by this object. 16677 * @return {@code true} if the method was successful, otherwise {@code false}. 16678 * <p> 16679 * The method should return {@code true} in response to an action type of 16680 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 16681 * operation. 16682 * </p> 16683 * <p> 16684 * The method should also return {@code true} in response to an action type of 16685 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 16686 * {@code false} if it didn't. 16687 * </p> 16688 */ 16689 public boolean onDragEvent(DragEvent event) { 16690 return false; 16691 } 16692 16693 /** 16694 * Detects if this View is enabled and has a drag event listener. 16695 * If both are true, then it calls the drag event listener with the 16696 * {@link android.view.DragEvent} it received. If the drag event listener returns 16697 * {@code true}, then dispatchDragEvent() returns {@code true}. 16698 * <p> 16699 * For all other cases, the method calls the 16700 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 16701 * method and returns its result. 16702 * </p> 16703 * <p> 16704 * This ensures that a drag event is always consumed, even if the View does not have a drag 16705 * event listener. However, if the View has a listener and the listener returns true, then 16706 * onDragEvent() is not called. 16707 * </p> 16708 */ 16709 public boolean dispatchDragEvent(DragEvent event) { 16710 //noinspection SimplifiableIfStatement 16711 ListenerInfo li = mListenerInfo; 16712 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 16713 && li.mOnDragListener.onDrag(this, event)) { 16714 return true; 16715 } 16716 return onDragEvent(event); 16717 } 16718 16719 boolean canAcceptDrag() { 16720 return (mPrivateFlags2 & PFLAG2_DRAG_CAN_ACCEPT) != 0; 16721 } 16722 16723 /** 16724 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 16725 * it is ever exposed at all. 16726 * @hide 16727 */ 16728 public void onCloseSystemDialogs(String reason) { 16729 } 16730 16731 /** 16732 * Given a Drawable whose bounds have been set to draw into this view, 16733 * update a Region being computed for 16734 * {@link #gatherTransparentRegion(android.graphics.Region)} so 16735 * that any non-transparent parts of the Drawable are removed from the 16736 * given transparent region. 16737 * 16738 * @param dr The Drawable whose transparency is to be applied to the region. 16739 * @param region A Region holding the current transparency information, 16740 * where any parts of the region that are set are considered to be 16741 * transparent. On return, this region will be modified to have the 16742 * transparency information reduced by the corresponding parts of the 16743 * Drawable that are not transparent. 16744 * {@hide} 16745 */ 16746 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 16747 if (DBG) { 16748 Log.i("View", "Getting transparent region for: " + this); 16749 } 16750 final Region r = dr.getTransparentRegion(); 16751 final Rect db = dr.getBounds(); 16752 final AttachInfo attachInfo = mAttachInfo; 16753 if (r != null && attachInfo != null) { 16754 final int w = getRight()-getLeft(); 16755 final int h = getBottom()-getTop(); 16756 if (db.left > 0) { 16757 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 16758 r.op(0, 0, db.left, h, Region.Op.UNION); 16759 } 16760 if (db.right < w) { 16761 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 16762 r.op(db.right, 0, w, h, Region.Op.UNION); 16763 } 16764 if (db.top > 0) { 16765 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 16766 r.op(0, 0, w, db.top, Region.Op.UNION); 16767 } 16768 if (db.bottom < h) { 16769 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 16770 r.op(0, db.bottom, w, h, Region.Op.UNION); 16771 } 16772 final int[] location = attachInfo.mTransparentLocation; 16773 getLocationInWindow(location); 16774 r.translate(location[0], location[1]); 16775 region.op(r, Region.Op.INTERSECT); 16776 } else { 16777 region.op(db, Region.Op.DIFFERENCE); 16778 } 16779 } 16780 16781 private void checkForLongClick(int delayOffset) { 16782 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 16783 mHasPerformedLongPress = false; 16784 16785 if (mPendingCheckForLongPress == null) { 16786 mPendingCheckForLongPress = new CheckForLongPress(); 16787 } 16788 mPendingCheckForLongPress.rememberWindowAttachCount(); 16789 postDelayed(mPendingCheckForLongPress, 16790 ViewConfiguration.getLongPressTimeout() - delayOffset); 16791 } 16792 } 16793 16794 /** 16795 * Inflate a view from an XML resource. This convenience method wraps the {@link 16796 * LayoutInflater} class, which provides a full range of options for view inflation. 16797 * 16798 * @param context The Context object for your activity or application. 16799 * @param resource The resource ID to inflate 16800 * @param root A view group that will be the parent. Used to properly inflate the 16801 * layout_* parameters. 16802 * @see LayoutInflater 16803 */ 16804 public static View inflate(Context context, int resource, ViewGroup root) { 16805 LayoutInflater factory = LayoutInflater.from(context); 16806 return factory.inflate(resource, root); 16807 } 16808 16809 /** 16810 * Scroll the view with standard behavior for scrolling beyond the normal 16811 * content boundaries. Views that call this method should override 16812 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 16813 * results of an over-scroll operation. 16814 * 16815 * Views can use this method to handle any touch or fling-based scrolling. 16816 * 16817 * @param deltaX Change in X in pixels 16818 * @param deltaY Change in Y in pixels 16819 * @param scrollX Current X scroll value in pixels before applying deltaX 16820 * @param scrollY Current Y scroll value in pixels before applying deltaY 16821 * @param scrollRangeX Maximum content scroll range along the X axis 16822 * @param scrollRangeY Maximum content scroll range along the Y axis 16823 * @param maxOverScrollX Number of pixels to overscroll by in either direction 16824 * along the X axis. 16825 * @param maxOverScrollY Number of pixels to overscroll by in either direction 16826 * along the Y axis. 16827 * @param isTouchEvent true if this scroll operation is the result of a touch event. 16828 * @return true if scrolling was clamped to an over-scroll boundary along either 16829 * axis, false otherwise. 16830 */ 16831 @SuppressWarnings({"UnusedParameters"}) 16832 protected boolean overScrollBy(int deltaX, int deltaY, 16833 int scrollX, int scrollY, 16834 int scrollRangeX, int scrollRangeY, 16835 int maxOverScrollX, int maxOverScrollY, 16836 boolean isTouchEvent) { 16837 final int overScrollMode = mOverScrollMode; 16838 final boolean canScrollHorizontal = 16839 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 16840 final boolean canScrollVertical = 16841 computeVerticalScrollRange() > computeVerticalScrollExtent(); 16842 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 16843 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 16844 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 16845 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 16846 16847 int newScrollX = scrollX + deltaX; 16848 if (!overScrollHorizontal) { 16849 maxOverScrollX = 0; 16850 } 16851 16852 int newScrollY = scrollY + deltaY; 16853 if (!overScrollVertical) { 16854 maxOverScrollY = 0; 16855 } 16856 16857 // Clamp values if at the limits and record 16858 final int left = -maxOverScrollX; 16859 final int right = maxOverScrollX + scrollRangeX; 16860 final int top = -maxOverScrollY; 16861 final int bottom = maxOverScrollY + scrollRangeY; 16862 16863 boolean clampedX = false; 16864 if (newScrollX > right) { 16865 newScrollX = right; 16866 clampedX = true; 16867 } else if (newScrollX < left) { 16868 newScrollX = left; 16869 clampedX = true; 16870 } 16871 16872 boolean clampedY = false; 16873 if (newScrollY > bottom) { 16874 newScrollY = bottom; 16875 clampedY = true; 16876 } else if (newScrollY < top) { 16877 newScrollY = top; 16878 clampedY = true; 16879 } 16880 16881 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16882 16883 return clampedX || clampedY; 16884 } 16885 16886 /** 16887 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16888 * respond to the results of an over-scroll operation. 16889 * 16890 * @param scrollX New X scroll value in pixels 16891 * @param scrollY New Y scroll value in pixels 16892 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16893 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16894 */ 16895 protected void onOverScrolled(int scrollX, int scrollY, 16896 boolean clampedX, boolean clampedY) { 16897 // Intentionally empty. 16898 } 16899 16900 /** 16901 * Returns the over-scroll mode for this view. The result will be 16902 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16903 * (allow over-scrolling only if the view content is larger than the container), 16904 * or {@link #OVER_SCROLL_NEVER}. 16905 * 16906 * @return This view's over-scroll mode. 16907 */ 16908 public int getOverScrollMode() { 16909 return mOverScrollMode; 16910 } 16911 16912 /** 16913 * Set the over-scroll mode for this view. Valid over-scroll modes are 16914 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16915 * (allow over-scrolling only if the view content is larger than the container), 16916 * or {@link #OVER_SCROLL_NEVER}. 16917 * 16918 * Setting the over-scroll mode of a view will have an effect only if the 16919 * view is capable of scrolling. 16920 * 16921 * @param overScrollMode The new over-scroll mode for this view. 16922 */ 16923 public void setOverScrollMode(int overScrollMode) { 16924 if (overScrollMode != OVER_SCROLL_ALWAYS && 16925 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16926 overScrollMode != OVER_SCROLL_NEVER) { 16927 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16928 } 16929 mOverScrollMode = overScrollMode; 16930 } 16931 16932 /** 16933 * Gets a scale factor that determines the distance the view should scroll 16934 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16935 * @return The vertical scroll scale factor. 16936 * @hide 16937 */ 16938 protected float getVerticalScrollFactor() { 16939 if (mVerticalScrollFactor == 0) { 16940 TypedValue outValue = new TypedValue(); 16941 if (!mContext.getTheme().resolveAttribute( 16942 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16943 throw new IllegalStateException( 16944 "Expected theme to define listPreferredItemHeight."); 16945 } 16946 mVerticalScrollFactor = outValue.getDimension( 16947 mContext.getResources().getDisplayMetrics()); 16948 } 16949 return mVerticalScrollFactor; 16950 } 16951 16952 /** 16953 * Gets a scale factor that determines the distance the view should scroll 16954 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16955 * @return The horizontal scroll scale factor. 16956 * @hide 16957 */ 16958 protected float getHorizontalScrollFactor() { 16959 // TODO: Should use something else. 16960 return getVerticalScrollFactor(); 16961 } 16962 16963 /** 16964 * Return the value specifying the text direction or policy that was set with 16965 * {@link #setTextDirection(int)}. 16966 * 16967 * @return the defined text direction. It can be one of: 16968 * 16969 * {@link #TEXT_DIRECTION_INHERIT}, 16970 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16971 * {@link #TEXT_DIRECTION_ANY_RTL}, 16972 * {@link #TEXT_DIRECTION_LTR}, 16973 * {@link #TEXT_DIRECTION_RTL}, 16974 * {@link #TEXT_DIRECTION_LOCALE} 16975 * 16976 * @attr ref android.R.styleable#View_textDirection 16977 * 16978 * @hide 16979 */ 16980 @ViewDebug.ExportedProperty(category = "text", mapping = { 16981 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16982 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16983 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16984 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16985 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16986 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16987 }) 16988 public int getRawTextDirection() { 16989 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_MASK) >> PFLAG2_TEXT_DIRECTION_MASK_SHIFT; 16990 } 16991 16992 /** 16993 * Set the text direction. 16994 * 16995 * @param textDirection the direction to set. Should be one of: 16996 * 16997 * {@link #TEXT_DIRECTION_INHERIT}, 16998 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16999 * {@link #TEXT_DIRECTION_ANY_RTL}, 17000 * {@link #TEXT_DIRECTION_LTR}, 17001 * {@link #TEXT_DIRECTION_RTL}, 17002 * {@link #TEXT_DIRECTION_LOCALE} 17003 * 17004 * Resolution will be done if the value is set to TEXT_DIRECTION_INHERIT. The resolution 17005 * proceeds up the parent chain of the view to get the value. If there is no parent, then it will 17006 * return the default {@link #TEXT_DIRECTION_FIRST_STRONG}. 17007 * 17008 * @attr ref android.R.styleable#View_textDirection 17009 */ 17010 public void setTextDirection(int textDirection) { 17011 if (getRawTextDirection() != textDirection) { 17012 // Reset the current text direction and the resolved one 17013 mPrivateFlags2 &= ~PFLAG2_TEXT_DIRECTION_MASK; 17014 resetResolvedTextDirection(); 17015 // Set the new text direction 17016 mPrivateFlags2 |= ((textDirection << PFLAG2_TEXT_DIRECTION_MASK_SHIFT) & PFLAG2_TEXT_DIRECTION_MASK); 17017 // Do resolution 17018 resolveTextDirection(); 17019 // Notify change 17020 onRtlPropertiesChanged(getLayoutDirection()); 17021 // Refresh 17022 requestLayout(); 17023 invalidate(true); 17024 } 17025 } 17026 17027 /** 17028 * Return the resolved text direction. 17029 * 17030 * @return the resolved text direction. Returns one of: 17031 * 17032 * {@link #TEXT_DIRECTION_FIRST_STRONG} 17033 * {@link #TEXT_DIRECTION_ANY_RTL}, 17034 * {@link #TEXT_DIRECTION_LTR}, 17035 * {@link #TEXT_DIRECTION_RTL}, 17036 * {@link #TEXT_DIRECTION_LOCALE} 17037 * 17038 * @attr ref android.R.styleable#View_textDirection 17039 */ 17040 @ViewDebug.ExportedProperty(category = "text", mapping = { 17041 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 17042 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 17043 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 17044 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 17045 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 17046 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 17047 }) 17048 public int getTextDirection() { 17049 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED_MASK) >> PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 17050 } 17051 17052 /** 17053 * Resolve the text direction. 17054 * 17055 * @return true if resolution has been done, false otherwise. 17056 * 17057 * @hide 17058 */ 17059 public boolean resolveTextDirection() { 17060 // Reset any previous text direction resolution 17061 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17062 17063 if (hasRtlSupport()) { 17064 // Set resolved text direction flag depending on text direction flag 17065 final int textDirection = getRawTextDirection(); 17066 switch(textDirection) { 17067 case TEXT_DIRECTION_INHERIT: 17068 if (!canResolveTextDirection()) { 17069 // We cannot do the resolution if there is no parent, so use the default one 17070 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17071 // Resolution will need to happen again later 17072 return false; 17073 } 17074 17075 // Parent has not yet resolved, so we still return the default 17076 if (!mParent.isTextDirectionResolved()) { 17077 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17078 // Resolution will need to happen again later 17079 return false; 17080 } 17081 17082 // Set current resolved direction to the same value as the parent's one 17083 final int parentResolvedDirection = mParent.getTextDirection(); 17084 switch (parentResolvedDirection) { 17085 case TEXT_DIRECTION_FIRST_STRONG: 17086 case TEXT_DIRECTION_ANY_RTL: 17087 case TEXT_DIRECTION_LTR: 17088 case TEXT_DIRECTION_RTL: 17089 case TEXT_DIRECTION_LOCALE: 17090 mPrivateFlags2 |= 17091 (parentResolvedDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17092 break; 17093 default: 17094 // Default resolved direction is "first strong" heuristic 17095 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17096 } 17097 break; 17098 case TEXT_DIRECTION_FIRST_STRONG: 17099 case TEXT_DIRECTION_ANY_RTL: 17100 case TEXT_DIRECTION_LTR: 17101 case TEXT_DIRECTION_RTL: 17102 case TEXT_DIRECTION_LOCALE: 17103 // Resolved direction is the same as text direction 17104 mPrivateFlags2 |= (textDirection << PFLAG2_TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 17105 break; 17106 default: 17107 // Default resolved direction is "first strong" heuristic 17108 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17109 } 17110 } else { 17111 // Default resolved direction is "first strong" heuristic 17112 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17113 } 17114 17115 // Set to resolved 17116 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED; 17117 return true; 17118 } 17119 17120 /** 17121 * Check if text direction resolution can be done. 17122 * 17123 * @return true if text direction resolution can be done otherwise return false. 17124 * 17125 * @hide 17126 */ 17127 public boolean canResolveTextDirection() { 17128 switch (getRawTextDirection()) { 17129 case TEXT_DIRECTION_INHERIT: 17130 return (mParent != null) && mParent.canResolveTextDirection(); 17131 default: 17132 return true; 17133 } 17134 } 17135 17136 /** 17137 * Reset resolved text direction. Text direction will be resolved during a call to 17138 * {@link #onMeasure(int, int)}. 17139 * 17140 * @hide 17141 */ 17142 public void resetResolvedTextDirection() { 17143 // Reset any previous text direction resolution 17144 mPrivateFlags2 &= ~(PFLAG2_TEXT_DIRECTION_RESOLVED | PFLAG2_TEXT_DIRECTION_RESOLVED_MASK); 17145 // Set to default value 17146 mPrivateFlags2 |= PFLAG2_TEXT_DIRECTION_RESOLVED_DEFAULT; 17147 } 17148 17149 /** 17150 * @return true if text direction is inherited. 17151 * 17152 * @hide 17153 */ 17154 public boolean isTextDirectionInherited() { 17155 return (getRawTextDirection() == TEXT_DIRECTION_INHERIT); 17156 } 17157 17158 /** 17159 * @return true if text direction is resolved. 17160 * 17161 * @hide 17162 */ 17163 public boolean isTextDirectionResolved() { 17164 return (mPrivateFlags2 & PFLAG2_TEXT_DIRECTION_RESOLVED) == PFLAG2_TEXT_DIRECTION_RESOLVED; 17165 } 17166 17167 /** 17168 * Return the value specifying the text alignment or policy that was set with 17169 * {@link #setTextAlignment(int)}. 17170 * 17171 * @return the defined text alignment. It can be one of: 17172 * 17173 * {@link #TEXT_ALIGNMENT_INHERIT}, 17174 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17175 * {@link #TEXT_ALIGNMENT_CENTER}, 17176 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17177 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17178 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17179 * {@link #TEXT_ALIGNMENT_VIEW_END} 17180 * 17181 * @attr ref android.R.styleable#View_textAlignment 17182 * 17183 * @hide 17184 */ 17185 @ViewDebug.ExportedProperty(category = "text", mapping = { 17186 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17187 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17188 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17189 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17190 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17191 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17192 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17193 }) 17194 public int getRawTextAlignment() { 17195 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_MASK) >> PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT; 17196 } 17197 17198 /** 17199 * Set the text alignment. 17200 * 17201 * @param textAlignment The text alignment to set. Should be one of 17202 * 17203 * {@link #TEXT_ALIGNMENT_INHERIT}, 17204 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17205 * {@link #TEXT_ALIGNMENT_CENTER}, 17206 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17207 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17208 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17209 * {@link #TEXT_ALIGNMENT_VIEW_END} 17210 * 17211 * Resolution will be done if the value is set to TEXT_ALIGNMENT_INHERIT. The resolution 17212 * proceeds up the parent chain of the view to get the value. If there is no parent, then it 17213 * will return the default {@link #TEXT_ALIGNMENT_GRAVITY}. 17214 * 17215 * @attr ref android.R.styleable#View_textAlignment 17216 */ 17217 public void setTextAlignment(int textAlignment) { 17218 if (textAlignment != getRawTextAlignment()) { 17219 // Reset the current and resolved text alignment 17220 mPrivateFlags2 &= ~PFLAG2_TEXT_ALIGNMENT_MASK; 17221 resetResolvedTextAlignment(); 17222 // Set the new text alignment 17223 mPrivateFlags2 |= 17224 ((textAlignment << PFLAG2_TEXT_ALIGNMENT_MASK_SHIFT) & PFLAG2_TEXT_ALIGNMENT_MASK); 17225 // Do resolution 17226 resolveTextAlignment(); 17227 // Notify change 17228 onRtlPropertiesChanged(getLayoutDirection()); 17229 // Refresh 17230 requestLayout(); 17231 invalidate(true); 17232 } 17233 } 17234 17235 /** 17236 * Return the resolved text alignment. 17237 * 17238 * @return the resolved text alignment. Returns one of: 17239 * 17240 * {@link #TEXT_ALIGNMENT_GRAVITY}, 17241 * {@link #TEXT_ALIGNMENT_CENTER}, 17242 * {@link #TEXT_ALIGNMENT_TEXT_START}, 17243 * {@link #TEXT_ALIGNMENT_TEXT_END}, 17244 * {@link #TEXT_ALIGNMENT_VIEW_START}, 17245 * {@link #TEXT_ALIGNMENT_VIEW_END} 17246 * 17247 * @attr ref android.R.styleable#View_textAlignment 17248 */ 17249 @ViewDebug.ExportedProperty(category = "text", mapping = { 17250 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 17251 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 17252 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 17253 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 17254 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 17255 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 17256 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 17257 }) 17258 public int getTextAlignment() { 17259 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK) >> 17260 PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 17261 } 17262 17263 /** 17264 * Resolve the text alignment. 17265 * 17266 * @return true if resolution has been done, false otherwise. 17267 * 17268 * @hide 17269 */ 17270 public boolean resolveTextAlignment() { 17271 // Reset any previous text alignment resolution 17272 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17273 17274 if (hasRtlSupport()) { 17275 // Set resolved text alignment flag depending on text alignment flag 17276 final int textAlignment = getRawTextAlignment(); 17277 switch (textAlignment) { 17278 case TEXT_ALIGNMENT_INHERIT: 17279 // Check if we can resolve the text alignment 17280 if (!canResolveTextAlignment()) { 17281 // We cannot do the resolution if there is no parent so use the default 17282 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17283 // Resolution will need to happen again later 17284 return false; 17285 } 17286 17287 // Parent has not yet resolved, so we still return the default 17288 if (!mParent.isTextAlignmentResolved()) { 17289 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17290 // Resolution will need to happen again later 17291 return false; 17292 } 17293 17294 final int parentResolvedTextAlignment = mParent.getTextAlignment(); 17295 switch (parentResolvedTextAlignment) { 17296 case TEXT_ALIGNMENT_GRAVITY: 17297 case TEXT_ALIGNMENT_TEXT_START: 17298 case TEXT_ALIGNMENT_TEXT_END: 17299 case TEXT_ALIGNMENT_CENTER: 17300 case TEXT_ALIGNMENT_VIEW_START: 17301 case TEXT_ALIGNMENT_VIEW_END: 17302 // Resolved text alignment is the same as the parent resolved 17303 // text alignment 17304 mPrivateFlags2 |= 17305 (parentResolvedTextAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17306 break; 17307 default: 17308 // Use default resolved text alignment 17309 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17310 } 17311 break; 17312 case TEXT_ALIGNMENT_GRAVITY: 17313 case TEXT_ALIGNMENT_TEXT_START: 17314 case TEXT_ALIGNMENT_TEXT_END: 17315 case TEXT_ALIGNMENT_CENTER: 17316 case TEXT_ALIGNMENT_VIEW_START: 17317 case TEXT_ALIGNMENT_VIEW_END: 17318 // Resolved text alignment is the same as text alignment 17319 mPrivateFlags2 |= (textAlignment << PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 17320 break; 17321 default: 17322 // Use default resolved text alignment 17323 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17324 } 17325 } else { 17326 // Use default resolved text alignment 17327 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17328 } 17329 17330 // Set the resolved 17331 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17332 return true; 17333 } 17334 17335 /** 17336 * Check if text alignment resolution can be done. 17337 * 17338 * @return true if text alignment resolution can be done otherwise return false. 17339 * 17340 * @hide 17341 */ 17342 public boolean canResolveTextAlignment() { 17343 switch (getRawTextAlignment()) { 17344 case TEXT_DIRECTION_INHERIT: 17345 return (mParent != null) && mParent.canResolveTextAlignment(); 17346 default: 17347 return true; 17348 } 17349 } 17350 17351 /** 17352 * Reset resolved text alignment. Text alignment will be resolved during a call to 17353 * {@link #onMeasure(int, int)}. 17354 * 17355 * @hide 17356 */ 17357 public void resetResolvedTextAlignment() { 17358 // Reset any previous text alignment resolution 17359 mPrivateFlags2 &= ~(PFLAG2_TEXT_ALIGNMENT_RESOLVED | PFLAG2_TEXT_ALIGNMENT_RESOLVED_MASK); 17360 // Set to default 17361 mPrivateFlags2 |= PFLAG2_TEXT_ALIGNMENT_RESOLVED_DEFAULT; 17362 } 17363 17364 /** 17365 * @return true if text alignment is inherited. 17366 * 17367 * @hide 17368 */ 17369 public boolean isTextAlignmentInherited() { 17370 return (getRawTextAlignment() == TEXT_ALIGNMENT_INHERIT); 17371 } 17372 17373 /** 17374 * @return true if text alignment is resolved. 17375 * 17376 * @hide 17377 */ 17378 public boolean isTextAlignmentResolved() { 17379 return (mPrivateFlags2 & PFLAG2_TEXT_ALIGNMENT_RESOLVED) == PFLAG2_TEXT_ALIGNMENT_RESOLVED; 17380 } 17381 17382 /** 17383 * Generate a value suitable for use in {@link #setId(int)}. 17384 * This value will not collide with ID values generated at build time by aapt for R.id. 17385 * 17386 * @return a generated ID value 17387 */ 17388 public static int generateViewId() { 17389 for (;;) { 17390 final int result = sNextGeneratedId.get(); 17391 // aapt-generated IDs have the high byte nonzero; clamp to the range under that. 17392 int newValue = result + 1; 17393 if (newValue > 0x00FFFFFF) newValue = 1; // Roll over to 1, not 0. 17394 if (sNextGeneratedId.compareAndSet(result, newValue)) { 17395 return result; 17396 } 17397 } 17398 } 17399 17400 // 17401 // Properties 17402 // 17403 /** 17404 * A Property wrapper around the <code>alpha</code> functionality handled by the 17405 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 17406 */ 17407 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 17408 @Override 17409 public void setValue(View object, float value) { 17410 object.setAlpha(value); 17411 } 17412 17413 @Override 17414 public Float get(View object) { 17415 return object.getAlpha(); 17416 } 17417 }; 17418 17419 /** 17420 * A Property wrapper around the <code>translationX</code> functionality handled by the 17421 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 17422 */ 17423 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 17424 @Override 17425 public void setValue(View object, float value) { 17426 object.setTranslationX(value); 17427 } 17428 17429 @Override 17430 public Float get(View object) { 17431 return object.getTranslationX(); 17432 } 17433 }; 17434 17435 /** 17436 * A Property wrapper around the <code>translationY</code> functionality handled by the 17437 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 17438 */ 17439 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 17440 @Override 17441 public void setValue(View object, float value) { 17442 object.setTranslationY(value); 17443 } 17444 17445 @Override 17446 public Float get(View object) { 17447 return object.getTranslationY(); 17448 } 17449 }; 17450 17451 /** 17452 * A Property wrapper around the <code>x</code> functionality handled by the 17453 * {@link View#setX(float)} and {@link View#getX()} methods. 17454 */ 17455 public static final Property<View, Float> X = new FloatProperty<View>("x") { 17456 @Override 17457 public void setValue(View object, float value) { 17458 object.setX(value); 17459 } 17460 17461 @Override 17462 public Float get(View object) { 17463 return object.getX(); 17464 } 17465 }; 17466 17467 /** 17468 * A Property wrapper around the <code>y</code> functionality handled by the 17469 * {@link View#setY(float)} and {@link View#getY()} methods. 17470 */ 17471 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 17472 @Override 17473 public void setValue(View object, float value) { 17474 object.setY(value); 17475 } 17476 17477 @Override 17478 public Float get(View object) { 17479 return object.getY(); 17480 } 17481 }; 17482 17483 /** 17484 * A Property wrapper around the <code>rotation</code> functionality handled by the 17485 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 17486 */ 17487 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 17488 @Override 17489 public void setValue(View object, float value) { 17490 object.setRotation(value); 17491 } 17492 17493 @Override 17494 public Float get(View object) { 17495 return object.getRotation(); 17496 } 17497 }; 17498 17499 /** 17500 * A Property wrapper around the <code>rotationX</code> functionality handled by the 17501 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 17502 */ 17503 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 17504 @Override 17505 public void setValue(View object, float value) { 17506 object.setRotationX(value); 17507 } 17508 17509 @Override 17510 public Float get(View object) { 17511 return object.getRotationX(); 17512 } 17513 }; 17514 17515 /** 17516 * A Property wrapper around the <code>rotationY</code> functionality handled by the 17517 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 17518 */ 17519 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 17520 @Override 17521 public void setValue(View object, float value) { 17522 object.setRotationY(value); 17523 } 17524 17525 @Override 17526 public Float get(View object) { 17527 return object.getRotationY(); 17528 } 17529 }; 17530 17531 /** 17532 * A Property wrapper around the <code>scaleX</code> functionality handled by the 17533 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 17534 */ 17535 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 17536 @Override 17537 public void setValue(View object, float value) { 17538 object.setScaleX(value); 17539 } 17540 17541 @Override 17542 public Float get(View object) { 17543 return object.getScaleX(); 17544 } 17545 }; 17546 17547 /** 17548 * A Property wrapper around the <code>scaleY</code> functionality handled by the 17549 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 17550 */ 17551 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 17552 @Override 17553 public void setValue(View object, float value) { 17554 object.setScaleY(value); 17555 } 17556 17557 @Override 17558 public Float get(View object) { 17559 return object.getScaleY(); 17560 } 17561 }; 17562 17563 /** 17564 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 17565 * Each MeasureSpec represents a requirement for either the width or the height. 17566 * A MeasureSpec is comprised of a size and a mode. There are three possible 17567 * modes: 17568 * <dl> 17569 * <dt>UNSPECIFIED</dt> 17570 * <dd> 17571 * The parent has not imposed any constraint on the child. It can be whatever size 17572 * it wants. 17573 * </dd> 17574 * 17575 * <dt>EXACTLY</dt> 17576 * <dd> 17577 * The parent has determined an exact size for the child. The child is going to be 17578 * given those bounds regardless of how big it wants to be. 17579 * </dd> 17580 * 17581 * <dt>AT_MOST</dt> 17582 * <dd> 17583 * The child can be as large as it wants up to the specified size. 17584 * </dd> 17585 * </dl> 17586 * 17587 * MeasureSpecs are implemented as ints to reduce object allocation. This class 17588 * is provided to pack and unpack the <size, mode> tuple into the int. 17589 */ 17590 public static class MeasureSpec { 17591 private static final int MODE_SHIFT = 30; 17592 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 17593 17594 /** 17595 * Measure specification mode: The parent has not imposed any constraint 17596 * on the child. It can be whatever size it wants. 17597 */ 17598 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 17599 17600 /** 17601 * Measure specification mode: The parent has determined an exact size 17602 * for the child. The child is going to be given those bounds regardless 17603 * of how big it wants to be. 17604 */ 17605 public static final int EXACTLY = 1 << MODE_SHIFT; 17606 17607 /** 17608 * Measure specification mode: The child can be as large as it wants up 17609 * to the specified size. 17610 */ 17611 public static final int AT_MOST = 2 << MODE_SHIFT; 17612 17613 /** 17614 * Creates a measure specification based on the supplied size and mode. 17615 * 17616 * The mode must always be one of the following: 17617 * <ul> 17618 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 17619 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 17620 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 17621 * </ul> 17622 * 17623 * <p><strong>Note:</strong> On API level 17 and lower, makeMeasureSpec's 17624 * implementation was such that the order of arguments did not matter 17625 * and overflow in either value could impact the resulting MeasureSpec. 17626 * {@link android.widget.RelativeLayout} was affected by this bug. 17627 * Apps targeting API levels greater than 17 will get the fixed, more strict 17628 * behavior.</p> 17629 * 17630 * @param size the size of the measure specification 17631 * @param mode the mode of the measure specification 17632 * @return the measure specification based on size and mode 17633 */ 17634 public static int makeMeasureSpec(int size, int mode) { 17635 if (sUseBrokenMakeMeasureSpec) { 17636 return size + mode; 17637 } else { 17638 return (size & ~MODE_MASK) | (mode & MODE_MASK); 17639 } 17640 } 17641 17642 /** 17643 * Extracts the mode from the supplied measure specification. 17644 * 17645 * @param measureSpec the measure specification to extract the mode from 17646 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 17647 * {@link android.view.View.MeasureSpec#AT_MOST} or 17648 * {@link android.view.View.MeasureSpec#EXACTLY} 17649 */ 17650 public static int getMode(int measureSpec) { 17651 return (measureSpec & MODE_MASK); 17652 } 17653 17654 /** 17655 * Extracts the size from the supplied measure specification. 17656 * 17657 * @param measureSpec the measure specification to extract the size from 17658 * @return the size in pixels defined in the supplied measure specification 17659 */ 17660 public static int getSize(int measureSpec) { 17661 return (measureSpec & ~MODE_MASK); 17662 } 17663 17664 static int adjust(int measureSpec, int delta) { 17665 return makeMeasureSpec(getSize(measureSpec + delta), getMode(measureSpec)); 17666 } 17667 17668 /** 17669 * Returns a String representation of the specified measure 17670 * specification. 17671 * 17672 * @param measureSpec the measure specification to convert to a String 17673 * @return a String with the following format: "MeasureSpec: MODE SIZE" 17674 */ 17675 public static String toString(int measureSpec) { 17676 int mode = getMode(measureSpec); 17677 int size = getSize(measureSpec); 17678 17679 StringBuilder sb = new StringBuilder("MeasureSpec: "); 17680 17681 if (mode == UNSPECIFIED) 17682 sb.append("UNSPECIFIED "); 17683 else if (mode == EXACTLY) 17684 sb.append("EXACTLY "); 17685 else if (mode == AT_MOST) 17686 sb.append("AT_MOST "); 17687 else 17688 sb.append(mode).append(" "); 17689 17690 sb.append(size); 17691 return sb.toString(); 17692 } 17693 } 17694 17695 class CheckForLongPress implements Runnable { 17696 17697 private int mOriginalWindowAttachCount; 17698 17699 public void run() { 17700 if (isPressed() && (mParent != null) 17701 && mOriginalWindowAttachCount == mWindowAttachCount) { 17702 if (performLongClick()) { 17703 mHasPerformedLongPress = true; 17704 } 17705 } 17706 } 17707 17708 public void rememberWindowAttachCount() { 17709 mOriginalWindowAttachCount = mWindowAttachCount; 17710 } 17711 } 17712 17713 private final class CheckForTap implements Runnable { 17714 public void run() { 17715 mPrivateFlags &= ~PFLAG_PREPRESSED; 17716 setPressed(true); 17717 checkForLongClick(ViewConfiguration.getTapTimeout()); 17718 } 17719 } 17720 17721 private final class PerformClick implements Runnable { 17722 public void run() { 17723 performClick(); 17724 } 17725 } 17726 17727 /** @hide */ 17728 public void hackTurnOffWindowResizeAnim(boolean off) { 17729 mAttachInfo.mTurnOffWindowResizeAnim = off; 17730 } 17731 17732 /** 17733 * This method returns a ViewPropertyAnimator object, which can be used to animate 17734 * specific properties on this View. 17735 * 17736 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 17737 */ 17738 public ViewPropertyAnimator animate() { 17739 if (mAnimator == null) { 17740 mAnimator = new ViewPropertyAnimator(this); 17741 } 17742 return mAnimator; 17743 } 17744 17745 /** 17746 * Interface definition for a callback to be invoked when a hardware key event is 17747 * dispatched to this view. The callback will be invoked before the key event is 17748 * given to the view. This is only useful for hardware keyboards; a software input 17749 * method has no obligation to trigger this listener. 17750 */ 17751 public interface OnKeyListener { 17752 /** 17753 * Called when a hardware key is dispatched to a view. This allows listeners to 17754 * get a chance to respond before the target view. 17755 * <p>Key presses in software keyboards will generally NOT trigger this method, 17756 * although some may elect to do so in some situations. Do not assume a 17757 * software input method has to be key-based; even if it is, it may use key presses 17758 * in a different way than you expect, so there is no way to reliably catch soft 17759 * input key presses. 17760 * 17761 * @param v The view the key has been dispatched to. 17762 * @param keyCode The code for the physical key that was pressed 17763 * @param event The KeyEvent object containing full information about 17764 * the event. 17765 * @return True if the listener has consumed the event, false otherwise. 17766 */ 17767 boolean onKey(View v, int keyCode, KeyEvent event); 17768 } 17769 17770 /** 17771 * Interface definition for a callback to be invoked when a touch event is 17772 * dispatched to this view. The callback will be invoked before the touch 17773 * event is given to the view. 17774 */ 17775 public interface OnTouchListener { 17776 /** 17777 * Called when a touch event is dispatched to a view. This allows listeners to 17778 * get a chance to respond before the target view. 17779 * 17780 * @param v The view the touch event has been dispatched to. 17781 * @param event The MotionEvent object containing full information about 17782 * the event. 17783 * @return True if the listener has consumed the event, false otherwise. 17784 */ 17785 boolean onTouch(View v, MotionEvent event); 17786 } 17787 17788 /** 17789 * Interface definition for a callback to be invoked when a hover event is 17790 * dispatched to this view. The callback will be invoked before the hover 17791 * event is given to the view. 17792 */ 17793 public interface OnHoverListener { 17794 /** 17795 * Called when a hover event is dispatched to a view. This allows listeners to 17796 * get a chance to respond before the target view. 17797 * 17798 * @param v The view the hover event has been dispatched to. 17799 * @param event The MotionEvent object containing full information about 17800 * the event. 17801 * @return True if the listener has consumed the event, false otherwise. 17802 */ 17803 boolean onHover(View v, MotionEvent event); 17804 } 17805 17806 /** 17807 * Interface definition for a callback to be invoked when a generic motion event is 17808 * dispatched to this view. The callback will be invoked before the generic motion 17809 * event is given to the view. 17810 */ 17811 public interface OnGenericMotionListener { 17812 /** 17813 * Called when a generic motion event is dispatched to a view. This allows listeners to 17814 * get a chance to respond before the target view. 17815 * 17816 * @param v The view the generic motion event has been dispatched to. 17817 * @param event The MotionEvent object containing full information about 17818 * the event. 17819 * @return True if the listener has consumed the event, false otherwise. 17820 */ 17821 boolean onGenericMotion(View v, MotionEvent event); 17822 } 17823 17824 /** 17825 * Interface definition for a callback to be invoked when a view has been clicked and held. 17826 */ 17827 public interface OnLongClickListener { 17828 /** 17829 * Called when a view has been clicked and held. 17830 * 17831 * @param v The view that was clicked and held. 17832 * 17833 * @return true if the callback consumed the long click, false otherwise. 17834 */ 17835 boolean onLongClick(View v); 17836 } 17837 17838 /** 17839 * Interface definition for a callback to be invoked when a drag is being dispatched 17840 * to this view. The callback will be invoked before the hosting view's own 17841 * onDrag(event) method. If the listener wants to fall back to the hosting view's 17842 * onDrag(event) behavior, it should return 'false' from this callback. 17843 * 17844 * <div class="special reference"> 17845 * <h3>Developer Guides</h3> 17846 * <p>For a guide to implementing drag and drop features, read the 17847 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 17848 * </div> 17849 */ 17850 public interface OnDragListener { 17851 /** 17852 * Called when a drag event is dispatched to a view. This allows listeners 17853 * to get a chance to override base View behavior. 17854 * 17855 * @param v The View that received the drag event. 17856 * @param event The {@link android.view.DragEvent} object for the drag event. 17857 * @return {@code true} if the drag event was handled successfully, or {@code false} 17858 * if the drag event was not handled. Note that {@code false} will trigger the View 17859 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 17860 */ 17861 boolean onDrag(View v, DragEvent event); 17862 } 17863 17864 /** 17865 * Interface definition for a callback to be invoked when the focus state of 17866 * a view changed. 17867 */ 17868 public interface OnFocusChangeListener { 17869 /** 17870 * Called when the focus state of a view has changed. 17871 * 17872 * @param v The view whose state has changed. 17873 * @param hasFocus The new focus state of v. 17874 */ 17875 void onFocusChange(View v, boolean hasFocus); 17876 } 17877 17878 /** 17879 * Interface definition for a callback to be invoked when a view is clicked. 17880 */ 17881 public interface OnClickListener { 17882 /** 17883 * Called when a view has been clicked. 17884 * 17885 * @param v The view that was clicked. 17886 */ 17887 void onClick(View v); 17888 } 17889 17890 /** 17891 * Interface definition for a callback to be invoked when the context menu 17892 * for this view is being built. 17893 */ 17894 public interface OnCreateContextMenuListener { 17895 /** 17896 * Called when the context menu for this view is being built. It is not 17897 * safe to hold onto the menu after this method returns. 17898 * 17899 * @param menu The context menu that is being built 17900 * @param v The view for which the context menu is being built 17901 * @param menuInfo Extra information about the item for which the 17902 * context menu should be shown. This information will vary 17903 * depending on the class of v. 17904 */ 17905 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 17906 } 17907 17908 /** 17909 * Interface definition for a callback to be invoked when the status bar changes 17910 * visibility. This reports <strong>global</strong> changes to the system UI 17911 * state, not what the application is requesting. 17912 * 17913 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 17914 */ 17915 public interface OnSystemUiVisibilityChangeListener { 17916 /** 17917 * Called when the status bar changes visibility because of a call to 17918 * {@link View#setSystemUiVisibility(int)}. 17919 * 17920 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 17921 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 17922 * This tells you the <strong>global</strong> state of these UI visibility 17923 * flags, not what your app is currently applying. 17924 */ 17925 public void onSystemUiVisibilityChange(int visibility); 17926 } 17927 17928 /** 17929 * Interface definition for a callback to be invoked when this view is attached 17930 * or detached from its window. 17931 */ 17932 public interface OnAttachStateChangeListener { 17933 /** 17934 * Called when the view is attached to a window. 17935 * @param v The view that was attached 17936 */ 17937 public void onViewAttachedToWindow(View v); 17938 /** 17939 * Called when the view is detached from a window. 17940 * @param v The view that was detached 17941 */ 17942 public void onViewDetachedFromWindow(View v); 17943 } 17944 17945 private final class UnsetPressedState implements Runnable { 17946 public void run() { 17947 setPressed(false); 17948 } 17949 } 17950 17951 /** 17952 * Base class for derived classes that want to save and restore their own 17953 * state in {@link android.view.View#onSaveInstanceState()}. 17954 */ 17955 public static class BaseSavedState extends AbsSavedState { 17956 /** 17957 * Constructor used when reading from a parcel. Reads the state of the superclass. 17958 * 17959 * @param source 17960 */ 17961 public BaseSavedState(Parcel source) { 17962 super(source); 17963 } 17964 17965 /** 17966 * Constructor called by derived classes when creating their SavedState objects 17967 * 17968 * @param superState The state of the superclass of this view 17969 */ 17970 public BaseSavedState(Parcelable superState) { 17971 super(superState); 17972 } 17973 17974 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17975 new Parcelable.Creator<BaseSavedState>() { 17976 public BaseSavedState createFromParcel(Parcel in) { 17977 return new BaseSavedState(in); 17978 } 17979 17980 public BaseSavedState[] newArray(int size) { 17981 return new BaseSavedState[size]; 17982 } 17983 }; 17984 } 17985 17986 /** 17987 * A set of information given to a view when it is attached to its parent 17988 * window. 17989 */ 17990 static class AttachInfo { 17991 interface Callbacks { 17992 void playSoundEffect(int effectId); 17993 boolean performHapticFeedback(int effectId, boolean always); 17994 } 17995 17996 /** 17997 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17998 * to a Handler. This class contains the target (View) to invalidate and 17999 * the coordinates of the dirty rectangle. 18000 * 18001 * For performance purposes, this class also implements a pool of up to 18002 * POOL_LIMIT objects that get reused. This reduces memory allocations 18003 * whenever possible. 18004 */ 18005 static class InvalidateInfo { 18006 private static final int POOL_LIMIT = 10; 18007 18008 private static final SynchronizedPool<InvalidateInfo> sPool = 18009 new SynchronizedPool<InvalidateInfo>(POOL_LIMIT); 18010 18011 View target; 18012 18013 int left; 18014 int top; 18015 int right; 18016 int bottom; 18017 18018 public static InvalidateInfo obtain() { 18019 InvalidateInfo instance = sPool.acquire(); 18020 return (instance != null) ? instance : new InvalidateInfo(); 18021 } 18022 18023 public void recycle() { 18024 target = null; 18025 sPool.release(this); 18026 } 18027 } 18028 18029 final IWindowSession mSession; 18030 18031 final IWindow mWindow; 18032 18033 final IBinder mWindowToken; 18034 18035 final Display mDisplay; 18036 18037 final Callbacks mRootCallbacks; 18038 18039 HardwareCanvas mHardwareCanvas; 18040 18041 IWindowId mIWindowId; 18042 WindowId mWindowId; 18043 18044 /** 18045 * The top view of the hierarchy. 18046 */ 18047 View mRootView; 18048 18049 IBinder mPanelParentWindowToken; 18050 Surface mSurface; 18051 18052 boolean mHardwareAccelerated; 18053 boolean mHardwareAccelerationRequested; 18054 HardwareRenderer mHardwareRenderer; 18055 18056 boolean mScreenOn; 18057 18058 /** 18059 * Scale factor used by the compatibility mode 18060 */ 18061 float mApplicationScale; 18062 18063 /** 18064 * Indicates whether the application is in compatibility mode 18065 */ 18066 boolean mScalingRequired; 18067 18068 /** 18069 * If set, ViewRootImpl doesn't use its lame animation for when the window resizes. 18070 */ 18071 boolean mTurnOffWindowResizeAnim; 18072 18073 /** 18074 * Left position of this view's window 18075 */ 18076 int mWindowLeft; 18077 18078 /** 18079 * Top position of this view's window 18080 */ 18081 int mWindowTop; 18082 18083 /** 18084 * Indicates whether views need to use 32-bit drawing caches 18085 */ 18086 boolean mUse32BitDrawingCache; 18087 18088 /** 18089 * For windows that are full-screen but using insets to layout inside 18090 * of the screen areas, these are the current insets to appear inside 18091 * the overscan area of the display. 18092 */ 18093 final Rect mOverscanInsets = new Rect(); 18094 18095 /** 18096 * For windows that are full-screen but using insets to layout inside 18097 * of the screen decorations, these are the current insets for the 18098 * content of the window. 18099 */ 18100 final Rect mContentInsets = new Rect(); 18101 18102 /** 18103 * For windows that are full-screen but using insets to layout inside 18104 * of the screen decorations, these are the current insets for the 18105 * actual visible parts of the window. 18106 */ 18107 final Rect mVisibleInsets = new Rect(); 18108 18109 /** 18110 * The internal insets given by this window. This value is 18111 * supplied by the client (through 18112 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 18113 * be given to the window manager when changed to be used in laying 18114 * out windows behind it. 18115 */ 18116 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 18117 = new ViewTreeObserver.InternalInsetsInfo(); 18118 18119 /** 18120 * All views in the window's hierarchy that serve as scroll containers, 18121 * used to determine if the window can be resized or must be panned 18122 * to adjust for a soft input area. 18123 */ 18124 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 18125 18126 final KeyEvent.DispatcherState mKeyDispatchState 18127 = new KeyEvent.DispatcherState(); 18128 18129 /** 18130 * Indicates whether the view's window currently has the focus. 18131 */ 18132 boolean mHasWindowFocus; 18133 18134 /** 18135 * The current visibility of the window. 18136 */ 18137 int mWindowVisibility; 18138 18139 /** 18140 * Indicates the time at which drawing started to occur. 18141 */ 18142 long mDrawingTime; 18143 18144 /** 18145 * Indicates whether or not ignoring the DIRTY_MASK flags. 18146 */ 18147 boolean mIgnoreDirtyState; 18148 18149 /** 18150 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 18151 * to avoid clearing that flag prematurely. 18152 */ 18153 boolean mSetIgnoreDirtyState = false; 18154 18155 /** 18156 * Indicates whether the view's window is currently in touch mode. 18157 */ 18158 boolean mInTouchMode; 18159 18160 /** 18161 * Indicates that ViewAncestor should trigger a global layout change 18162 * the next time it performs a traversal 18163 */ 18164 boolean mRecomputeGlobalAttributes; 18165 18166 /** 18167 * Always report new attributes at next traversal. 18168 */ 18169 boolean mForceReportNewAttributes; 18170 18171 /** 18172 * Set during a traveral if any views want to keep the screen on. 18173 */ 18174 boolean mKeepScreenOn; 18175 18176 /** 18177 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 18178 */ 18179 int mSystemUiVisibility; 18180 18181 /** 18182 * Hack to force certain system UI visibility flags to be cleared. 18183 */ 18184 int mDisabledSystemUiVisibility; 18185 18186 /** 18187 * Last global system UI visibility reported by the window manager. 18188 */ 18189 int mGlobalSystemUiVisibility; 18190 18191 /** 18192 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 18193 * attached. 18194 */ 18195 boolean mHasSystemUiListeners; 18196 18197 /** 18198 * Set if the window has requested to extend into the overscan region 18199 * via WindowManager.LayoutParams.FLAG_LAYOUT_IN_OVERSCAN. 18200 */ 18201 boolean mOverscanRequested; 18202 18203 /** 18204 * Set if the visibility of any views has changed. 18205 */ 18206 boolean mViewVisibilityChanged; 18207 18208 /** 18209 * Set to true if a view has been scrolled. 18210 */ 18211 boolean mViewScrollChanged; 18212 18213 /** 18214 * Global to the view hierarchy used as a temporary for dealing with 18215 * x/y points in the transparent region computations. 18216 */ 18217 final int[] mTransparentLocation = new int[2]; 18218 18219 /** 18220 * Global to the view hierarchy used as a temporary for dealing with 18221 * x/y points in the ViewGroup.invalidateChild implementation. 18222 */ 18223 final int[] mInvalidateChildLocation = new int[2]; 18224 18225 18226 /** 18227 * Global to the view hierarchy used as a temporary for dealing with 18228 * x/y location when view is transformed. 18229 */ 18230 final float[] mTmpTransformLocation = new float[2]; 18231 18232 /** 18233 * The view tree observer used to dispatch global events like 18234 * layout, pre-draw, touch mode change, etc. 18235 */ 18236 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 18237 18238 /** 18239 * A Canvas used by the view hierarchy to perform bitmap caching. 18240 */ 18241 Canvas mCanvas; 18242 18243 /** 18244 * The view root impl. 18245 */ 18246 final ViewRootImpl mViewRootImpl; 18247 18248 /** 18249 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 18250 * handler can be used to pump events in the UI events queue. 18251 */ 18252 final Handler mHandler; 18253 18254 /** 18255 * Temporary for use in computing invalidate rectangles while 18256 * calling up the hierarchy. 18257 */ 18258 final Rect mTmpInvalRect = new Rect(); 18259 18260 /** 18261 * Temporary for use in computing hit areas with transformed views 18262 */ 18263 final RectF mTmpTransformRect = new RectF(); 18264 18265 /** 18266 * Temporary for use in transforming invalidation rect 18267 */ 18268 final Matrix mTmpMatrix = new Matrix(); 18269 18270 /** 18271 * Temporary for use in transforming invalidation rect 18272 */ 18273 final Transformation mTmpTransformation = new Transformation(); 18274 18275 /** 18276 * Temporary list for use in collecting focusable descendents of a view. 18277 */ 18278 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 18279 18280 /** 18281 * The id of the window for accessibility purposes. 18282 */ 18283 int mAccessibilityWindowId = View.NO_ID; 18284 18285 /** 18286 * Flags related to accessibility processing. 18287 * 18288 * @see AccessibilityNodeInfo#FLAG_INCLUDE_NOT_IMPORTANT_VIEWS 18289 * @see AccessibilityNodeInfo#FLAG_REPORT_VIEW_IDS 18290 */ 18291 int mAccessibilityFetchFlags; 18292 18293 /** 18294 * The drawable for highlighting accessibility focus. 18295 */ 18296 Drawable mAccessibilityFocusDrawable; 18297 18298 /** 18299 * Show where the margins, bounds and layout bounds are for each view. 18300 */ 18301 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 18302 18303 /** 18304 * Point used to compute visible regions. 18305 */ 18306 final Point mPoint = new Point(); 18307 18308 /** 18309 * Used to track which View originated a requestLayout() call, used when 18310 * requestLayout() is called during layout. 18311 */ 18312 View mViewRequestingLayout; 18313 18314 /** 18315 * Creates a new set of attachment information with the specified 18316 * events handler and thread. 18317 * 18318 * @param handler the events handler the view must use 18319 */ 18320 AttachInfo(IWindowSession session, IWindow window, Display display, 18321 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 18322 mSession = session; 18323 mWindow = window; 18324 mWindowToken = window.asBinder(); 18325 mDisplay = display; 18326 mViewRootImpl = viewRootImpl; 18327 mHandler = handler; 18328 mRootCallbacks = effectPlayer; 18329 } 18330 } 18331 18332 /** 18333 * <p>ScrollabilityCache holds various fields used by a View when scrolling 18334 * is supported. This avoids keeping too many unused fields in most 18335 * instances of View.</p> 18336 */ 18337 private static class ScrollabilityCache implements Runnable { 18338 18339 /** 18340 * Scrollbars are not visible 18341 */ 18342 public static final int OFF = 0; 18343 18344 /** 18345 * Scrollbars are visible 18346 */ 18347 public static final int ON = 1; 18348 18349 /** 18350 * Scrollbars are fading away 18351 */ 18352 public static final int FADING = 2; 18353 18354 public boolean fadeScrollBars; 18355 18356 public int fadingEdgeLength; 18357 public int scrollBarDefaultDelayBeforeFade; 18358 public int scrollBarFadeDuration; 18359 18360 public int scrollBarSize; 18361 public ScrollBarDrawable scrollBar; 18362 public float[] interpolatorValues; 18363 public View host; 18364 18365 public final Paint paint; 18366 public final Matrix matrix; 18367 public Shader shader; 18368 18369 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 18370 18371 private static final float[] OPAQUE = { 255 }; 18372 private static final float[] TRANSPARENT = { 0.0f }; 18373 18374 /** 18375 * When fading should start. This time moves into the future every time 18376 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 18377 */ 18378 public long fadeStartTime; 18379 18380 18381 /** 18382 * The current state of the scrollbars: ON, OFF, or FADING 18383 */ 18384 public int state = OFF; 18385 18386 private int mLastColor; 18387 18388 public ScrollabilityCache(ViewConfiguration configuration, View host) { 18389 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 18390 scrollBarSize = configuration.getScaledScrollBarSize(); 18391 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 18392 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 18393 18394 paint = new Paint(); 18395 matrix = new Matrix(); 18396 // use use a height of 1, and then wack the matrix each time we 18397 // actually use it. 18398 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18399 paint.setShader(shader); 18400 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18401 18402 this.host = host; 18403 } 18404 18405 public void setFadeColor(int color) { 18406 if (color != mLastColor) { 18407 mLastColor = color; 18408 18409 if (color != 0) { 18410 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 18411 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 18412 paint.setShader(shader); 18413 // Restore the default transfer mode (src_over) 18414 paint.setXfermode(null); 18415 } else { 18416 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 18417 paint.setShader(shader); 18418 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 18419 } 18420 } 18421 } 18422 18423 public void run() { 18424 long now = AnimationUtils.currentAnimationTimeMillis(); 18425 if (now >= fadeStartTime) { 18426 18427 // the animation fades the scrollbars out by changing 18428 // the opacity (alpha) from fully opaque to fully 18429 // transparent 18430 int nextFrame = (int) now; 18431 int framesCount = 0; 18432 18433 Interpolator interpolator = scrollBarInterpolator; 18434 18435 // Start opaque 18436 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 18437 18438 // End transparent 18439 nextFrame += scrollBarFadeDuration; 18440 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 18441 18442 state = FADING; 18443 18444 // Kick off the fade animation 18445 host.invalidate(true); 18446 } 18447 } 18448 } 18449 18450 /** 18451 * Resuable callback for sending 18452 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 18453 */ 18454 private class SendViewScrolledAccessibilityEvent implements Runnable { 18455 public volatile boolean mIsPending; 18456 18457 public void run() { 18458 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 18459 mIsPending = false; 18460 } 18461 } 18462 18463 /** 18464 * <p> 18465 * This class represents a delegate that can be registered in a {@link View} 18466 * to enhance accessibility support via composition rather via inheritance. 18467 * It is specifically targeted to widget developers that extend basic View 18468 * classes i.e. classes in package android.view, that would like their 18469 * applications to be backwards compatible. 18470 * </p> 18471 * <div class="special reference"> 18472 * <h3>Developer Guides</h3> 18473 * <p>For more information about making applications accessible, read the 18474 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 18475 * developer guide.</p> 18476 * </div> 18477 * <p> 18478 * A scenario in which a developer would like to use an accessibility delegate 18479 * is overriding a method introduced in a later API version then the minimal API 18480 * version supported by the application. For example, the method 18481 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 18482 * in API version 4 when the accessibility APIs were first introduced. If a 18483 * developer would like his application to run on API version 4 devices (assuming 18484 * all other APIs used by the application are version 4 or lower) and take advantage 18485 * of this method, instead of overriding the method which would break the application's 18486 * backwards compatibility, he can override the corresponding method in this 18487 * delegate and register the delegate in the target View if the API version of 18488 * the system is high enough i.e. the API version is same or higher to the API 18489 * version that introduced 18490 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 18491 * </p> 18492 * <p> 18493 * Here is an example implementation: 18494 * </p> 18495 * <code><pre><p> 18496 * if (Build.VERSION.SDK_INT >= 14) { 18497 * // If the API version is equal of higher than the version in 18498 * // which onInitializeAccessibilityNodeInfo was introduced we 18499 * // register a delegate with a customized implementation. 18500 * View view = findViewById(R.id.view_id); 18501 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 18502 * public void onInitializeAccessibilityNodeInfo(View host, 18503 * AccessibilityNodeInfo info) { 18504 * // Let the default implementation populate the info. 18505 * super.onInitializeAccessibilityNodeInfo(host, info); 18506 * // Set some other information. 18507 * info.setEnabled(host.isEnabled()); 18508 * } 18509 * }); 18510 * } 18511 * </code></pre></p> 18512 * <p> 18513 * This delegate contains methods that correspond to the accessibility methods 18514 * in View. If a delegate has been specified the implementation in View hands 18515 * off handling to the corresponding method in this delegate. The default 18516 * implementation the delegate methods behaves exactly as the corresponding 18517 * method in View for the case of no accessibility delegate been set. Hence, 18518 * to customize the behavior of a View method, clients can override only the 18519 * corresponding delegate method without altering the behavior of the rest 18520 * accessibility related methods of the host view. 18521 * </p> 18522 */ 18523 public static class AccessibilityDelegate { 18524 18525 /** 18526 * Sends an accessibility event of the given type. If accessibility is not 18527 * enabled this method has no effect. 18528 * <p> 18529 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 18530 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 18531 * been set. 18532 * </p> 18533 * 18534 * @param host The View hosting the delegate. 18535 * @param eventType The type of the event to send. 18536 * 18537 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 18538 */ 18539 public void sendAccessibilityEvent(View host, int eventType) { 18540 host.sendAccessibilityEventInternal(eventType); 18541 } 18542 18543 /** 18544 * Performs the specified accessibility action on the view. For 18545 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 18546 * <p> 18547 * The default implementation behaves as 18548 * {@link View#performAccessibilityAction(int, Bundle) 18549 * View#performAccessibilityAction(int, Bundle)} for the case of 18550 * no accessibility delegate been set. 18551 * </p> 18552 * 18553 * @param action The action to perform. 18554 * @return Whether the action was performed. 18555 * 18556 * @see View#performAccessibilityAction(int, Bundle) 18557 * View#performAccessibilityAction(int, Bundle) 18558 */ 18559 public boolean performAccessibilityAction(View host, int action, Bundle args) { 18560 return host.performAccessibilityActionInternal(action, args); 18561 } 18562 18563 /** 18564 * Sends an accessibility event. This method behaves exactly as 18565 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 18566 * empty {@link AccessibilityEvent} and does not perform a check whether 18567 * accessibility is enabled. 18568 * <p> 18569 * The default implementation behaves as 18570 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18571 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 18572 * the case of no accessibility delegate been set. 18573 * </p> 18574 * 18575 * @param host The View hosting the delegate. 18576 * @param event The event to send. 18577 * 18578 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18579 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 18580 */ 18581 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 18582 host.sendAccessibilityEventUncheckedInternal(event); 18583 } 18584 18585 /** 18586 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 18587 * to its children for adding their text content to the event. 18588 * <p> 18589 * The default implementation behaves as 18590 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18591 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 18592 * the case of no accessibility delegate been set. 18593 * </p> 18594 * 18595 * @param host The View hosting the delegate. 18596 * @param event The event. 18597 * @return True if the event population was completed. 18598 * 18599 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18600 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 18601 */ 18602 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18603 return host.dispatchPopulateAccessibilityEventInternal(event); 18604 } 18605 18606 /** 18607 * Gives a chance to the host View to populate the accessibility event with its 18608 * text content. 18609 * <p> 18610 * The default implementation behaves as 18611 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 18612 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 18613 * the case of no accessibility delegate been set. 18614 * </p> 18615 * 18616 * @param host The View hosting the delegate. 18617 * @param event The accessibility event which to populate. 18618 * 18619 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 18620 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 18621 */ 18622 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 18623 host.onPopulateAccessibilityEventInternal(event); 18624 } 18625 18626 /** 18627 * Initializes an {@link AccessibilityEvent} with information about the 18628 * the host View which is the event source. 18629 * <p> 18630 * The default implementation behaves as 18631 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 18632 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 18633 * the case of no accessibility delegate been set. 18634 * </p> 18635 * 18636 * @param host The View hosting the delegate. 18637 * @param event The event to initialize. 18638 * 18639 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 18640 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 18641 */ 18642 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 18643 host.onInitializeAccessibilityEventInternal(event); 18644 } 18645 18646 /** 18647 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 18648 * <p> 18649 * The default implementation behaves as 18650 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18651 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 18652 * the case of no accessibility delegate been set. 18653 * </p> 18654 * 18655 * @param host The View hosting the delegate. 18656 * @param info The instance to initialize. 18657 * 18658 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18659 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 18660 */ 18661 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 18662 host.onInitializeAccessibilityNodeInfoInternal(info); 18663 } 18664 18665 /** 18666 * Called when a child of the host View has requested sending an 18667 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 18668 * to augment the event. 18669 * <p> 18670 * The default implementation behaves as 18671 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18672 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 18673 * the case of no accessibility delegate been set. 18674 * </p> 18675 * 18676 * @param host The View hosting the delegate. 18677 * @param child The child which requests sending the event. 18678 * @param event The event to be sent. 18679 * @return True if the event should be sent 18680 * 18681 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18682 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 18683 */ 18684 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 18685 AccessibilityEvent event) { 18686 return host.onRequestSendAccessibilityEventInternal(child, event); 18687 } 18688 18689 /** 18690 * Gets the provider for managing a virtual view hierarchy rooted at this View 18691 * and reported to {@link android.accessibilityservice.AccessibilityService}s 18692 * that explore the window content. 18693 * <p> 18694 * The default implementation behaves as 18695 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 18696 * the case of no accessibility delegate been set. 18697 * </p> 18698 * 18699 * @return The provider. 18700 * 18701 * @see AccessibilityNodeProvider 18702 */ 18703 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 18704 return null; 18705 } 18706 } 18707 18708 private class MatchIdPredicate implements Predicate<View> { 18709 public int mId; 18710 18711 @Override 18712 public boolean apply(View view) { 18713 return (view.mID == mId); 18714 } 18715 } 18716 18717 private class MatchLabelForPredicate implements Predicate<View> { 18718 private int mLabeledId; 18719 18720 @Override 18721 public boolean apply(View view) { 18722 return (view.mLabelForId == mLabeledId); 18723 } 18724 } 18725 18726 /** 18727 * Dump all private flags in readable format, useful for documentation and 18728 * sanity checking. 18729 */ 18730 private static void dumpFlags() { 18731 final HashMap<String, String> found = Maps.newHashMap(); 18732 try { 18733 for (Field field : View.class.getDeclaredFields()) { 18734 final int modifiers = field.getModifiers(); 18735 if (Modifier.isStatic(modifiers) && Modifier.isFinal(modifiers)) { 18736 if (field.getType().equals(int.class)) { 18737 final int value = field.getInt(null); 18738 dumpFlag(found, field.getName(), value); 18739 } else if (field.getType().equals(int[].class)) { 18740 final int[] values = (int[]) field.get(null); 18741 for (int i = 0; i < values.length; i++) { 18742 dumpFlag(found, field.getName() + "[" + i + "]", values[i]); 18743 } 18744 } 18745 } 18746 } 18747 } catch (IllegalAccessException e) { 18748 throw new RuntimeException(e); 18749 } 18750 18751 final ArrayList<String> keys = Lists.newArrayList(); 18752 keys.addAll(found.keySet()); 18753 Collections.sort(keys); 18754 for (String key : keys) { 18755 Log.d(VIEW_LOG_TAG, found.get(key)); 18756 } 18757 } 18758 18759 private static void dumpFlag(HashMap<String, String> found, String name, int value) { 18760 // Sort flags by prefix, then by bits, always keeping unique keys 18761 final String bits = String.format("%32s", Integer.toBinaryString(value)).replace('0', ' '); 18762 final int prefix = name.indexOf('_'); 18763 final String key = (prefix > 0 ? name.substring(0, prefix) : name) + bits + name; 18764 final String output = bits + " " + name; 18765 found.put(key, output); 18766 } 18767} 18768