View.java revision d5333f92894ae54943199d02015f0c9ef4548fd6
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.os.Bundle; 43import android.os.Handler; 44import android.os.IBinder; 45import android.os.Parcel; 46import android.os.Parcelable; 47import android.os.RemoteException; 48import android.os.SystemClock; 49import android.os.SystemProperties; 50import android.util.AttributeSet; 51import android.util.FloatProperty; 52import android.util.LocaleUtil; 53import android.util.Log; 54import android.util.Pool; 55import android.util.Poolable; 56import android.util.PoolableManager; 57import android.util.Pools; 58import android.util.Property; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.AccessibilityIterators.TextSegmentIterator; 63import android.view.AccessibilityIterators.CharacterTextSegmentIterator; 64import android.view.AccessibilityIterators.WordTextSegmentIterator; 65import android.view.AccessibilityIterators.ParagraphTextSegmentIterator; 66import android.view.accessibility.AccessibilityEvent; 67import android.view.accessibility.AccessibilityEventSource; 68import android.view.accessibility.AccessibilityManager; 69import android.view.accessibility.AccessibilityNodeInfo; 70import android.view.accessibility.AccessibilityNodeProvider; 71import android.view.animation.Animation; 72import android.view.animation.AnimationUtils; 73import android.view.animation.Transformation; 74import android.view.inputmethod.EditorInfo; 75import android.view.inputmethod.InputConnection; 76import android.view.inputmethod.InputMethodManager; 77import android.widget.ScrollBarDrawable; 78 79import static android.os.Build.VERSION_CODES.*; 80import static java.lang.Math.max; 81 82import com.android.internal.R; 83import com.android.internal.util.Predicate; 84import com.android.internal.view.menu.MenuBuilder; 85 86import java.lang.ref.WeakReference; 87import java.lang.reflect.InvocationTargetException; 88import java.lang.reflect.Method; 89import java.util.ArrayList; 90import java.util.Arrays; 91import java.util.Locale; 92import java.util.concurrent.CopyOnWriteArrayList; 93 94/** 95 * <p> 96 * This class represents the basic building block for user interface components. A View 97 * occupies a rectangular area on the screen and is responsible for drawing and 98 * event handling. View is the base class for <em>widgets</em>, which are 99 * used to create interactive UI components (buttons, text fields, etc.). The 100 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 101 * are invisible containers that hold other Views (or other ViewGroups) and define 102 * their layout properties. 103 * </p> 104 * 105 * <div class="special reference"> 106 * <h3>Developer Guides</h3> 107 * <p>For information about using this class to develop your application's user interface, 108 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} method and queried by calling 347 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, {@link #getPaddingRight()}, 348 * {@link #getPaddingBottom()}. 349 * </p> 350 * 351 * <p> 352 * Even though a view can define a padding, it does not provide any support for 353 * margins. However, view groups provide such a support. Refer to 354 * {@link android.view.ViewGroup} and 355 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 356 * </p> 357 * 358 * <a name="Layout"></a> 359 * <h3>Layout</h3> 360 * <p> 361 * Layout is a two pass process: a measure pass and a layout pass. The measuring 362 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 363 * of the view tree. Each view pushes dimension specifications down the tree 364 * during the recursion. At the end of the measure pass, every view has stored 365 * its measurements. The second pass happens in 366 * {@link #layout(int,int,int,int)} and is also top-down. During 367 * this pass each parent is responsible for positioning all of its children 368 * using the sizes computed in the measure pass. 369 * </p> 370 * 371 * <p> 372 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 373 * {@link #getMeasuredHeight()} values must be set, along with those for all of 374 * that view's descendants. A view's measured width and measured height values 375 * must respect the constraints imposed by the view's parents. This guarantees 376 * that at the end of the measure pass, all parents accept all of their 377 * children's measurements. A parent view may call measure() more than once on 378 * its children. For example, the parent may measure each child once with 379 * unspecified dimensions to find out how big they want to be, then call 380 * measure() on them again with actual numbers if the sum of all the children's 381 * unconstrained sizes is too big or too small. 382 * </p> 383 * 384 * <p> 385 * The measure pass uses two classes to communicate dimensions. The 386 * {@link MeasureSpec} class is used by views to tell their parents how they 387 * want to be measured and positioned. The base LayoutParams class just 388 * describes how big the view wants to be for both width and height. For each 389 * dimension, it can specify one of: 390 * <ul> 391 * <li> an exact number 392 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 393 * (minus padding) 394 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 395 * enclose its content (plus padding). 396 * </ul> 397 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 398 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 399 * an X and Y value. 400 * </p> 401 * 402 * <p> 403 * MeasureSpecs are used to push requirements down the tree from parent to 404 * child. A MeasureSpec can be in one of three modes: 405 * <ul> 406 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 407 * of a child view. For example, a LinearLayout may call measure() on its child 408 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 409 * tall the child view wants to be given a width of 240 pixels. 410 * <li>EXACTLY: This is used by the parent to impose an exact size on the 411 * child. The child must use this size, and guarantee that all of its 412 * descendants will fit within this size. 413 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 414 * child. The child must gurantee that it and all of its descendants will fit 415 * within this size. 416 * </ul> 417 * </p> 418 * 419 * <p> 420 * To intiate a layout, call {@link #requestLayout}. This method is typically 421 * called by a view on itself when it believes that is can no longer fit within 422 * its current bounds. 423 * </p> 424 * 425 * <a name="Drawing"></a> 426 * <h3>Drawing</h3> 427 * <p> 428 * Drawing is handled by walking the tree and rendering each view that 429 * intersects the invalid region. Because the tree is traversed in-order, 430 * this means that parents will draw before (i.e., behind) their children, with 431 * siblings drawn in the order they appear in the tree. 432 * If you set a background drawable for a View, then the View will draw it for you 433 * before calling back to its <code>onDraw()</code> method. 434 * </p> 435 * 436 * <p> 437 * Note that the framework will not draw views that are not in the invalid region. 438 * </p> 439 * 440 * <p> 441 * To force a view to draw, call {@link #invalidate()}. 442 * </p> 443 * 444 * <a name="EventHandlingThreading"></a> 445 * <h3>Event Handling and Threading</h3> 446 * <p> 447 * The basic cycle of a view is as follows: 448 * <ol> 449 * <li>An event comes in and is dispatched to the appropriate view. The view 450 * handles the event and notifies any listeners.</li> 451 * <li>If in the course of processing the event, the view's bounds may need 452 * to be changed, the view will call {@link #requestLayout()}.</li> 453 * <li>Similarly, if in the course of processing the event the view's appearance 454 * may need to be changed, the view will call {@link #invalidate()}.</li> 455 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 456 * the framework will take care of measuring, laying out, and drawing the tree 457 * as appropriate.</li> 458 * </ol> 459 * </p> 460 * 461 * <p><em>Note: The entire view tree is single threaded. You must always be on 462 * the UI thread when calling any method on any view.</em> 463 * If you are doing work on other threads and want to update the state of a view 464 * from that thread, you should use a {@link Handler}. 465 * </p> 466 * 467 * <a name="FocusHandling"></a> 468 * <h3>Focus Handling</h3> 469 * <p> 470 * The framework will handle routine focus movement in response to user input. 471 * This includes changing the focus as views are removed or hidden, or as new 472 * views become available. Views indicate their willingness to take focus 473 * through the {@link #isFocusable} method. To change whether a view can take 474 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 475 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 476 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 477 * </p> 478 * <p> 479 * Focus movement is based on an algorithm which finds the nearest neighbor in a 480 * given direction. In rare cases, the default algorithm may not match the 481 * intended behavior of the developer. In these situations, you can provide 482 * explicit overrides by using these XML attributes in the layout file: 483 * <pre> 484 * nextFocusDown 485 * nextFocusLeft 486 * nextFocusRight 487 * nextFocusUp 488 * </pre> 489 * </p> 490 * 491 * 492 * <p> 493 * To get a particular view to take focus, call {@link #requestFocus()}. 494 * </p> 495 * 496 * <a name="TouchMode"></a> 497 * <h3>Touch Mode</h3> 498 * <p> 499 * When a user is navigating a user interface via directional keys such as a D-pad, it is 500 * necessary to give focus to actionable items such as buttons so the user can see 501 * what will take input. If the device has touch capabilities, however, and the user 502 * begins interacting with the interface by touching it, it is no longer necessary to 503 * always highlight, or give focus to, a particular view. This motivates a mode 504 * for interaction named 'touch mode'. 505 * </p> 506 * <p> 507 * For a touch capable device, once the user touches the screen, the device 508 * will enter touch mode. From this point onward, only views for which 509 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 510 * Other views that are touchable, like buttons, will not take focus when touched; they will 511 * only fire the on click listeners. 512 * </p> 513 * <p> 514 * Any time a user hits a directional key, such as a D-pad direction, the view device will 515 * exit touch mode, and find a view to take focus, so that the user may resume interacting 516 * with the user interface without touching the screen again. 517 * </p> 518 * <p> 519 * The touch mode state is maintained across {@link android.app.Activity}s. Call 520 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 521 * </p> 522 * 523 * <a name="Scrolling"></a> 524 * <h3>Scrolling</h3> 525 * <p> 526 * The framework provides basic support for views that wish to internally 527 * scroll their content. This includes keeping track of the X and Y scroll 528 * offset as well as mechanisms for drawing scrollbars. See 529 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 530 * {@link #awakenScrollBars()} for more details. 531 * </p> 532 * 533 * <a name="Tags"></a> 534 * <h3>Tags</h3> 535 * <p> 536 * Unlike IDs, tags are not used to identify views. Tags are essentially an 537 * extra piece of information that can be associated with a view. They are most 538 * often used as a convenience to store data related to views in the views 539 * themselves rather than by putting them in a separate structure. 540 * </p> 541 * 542 * <a name="Properties"></a> 543 * <h3>Properties</h3> 544 * <p> 545 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 546 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 547 * available both in the {@link Property} form as well as in similarly-named setter/getter 548 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 549 * be used to set persistent state associated with these rendering-related properties on the view. 550 * The properties and methods can also be used in conjunction with 551 * {@link android.animation.Animator Animator}-based animations, described more in the 552 * <a href="#Animation">Animation</a> section. 553 * </p> 554 * 555 * <a name="Animation"></a> 556 * <h3>Animation</h3> 557 * <p> 558 * Starting with Android 3.0, the preferred way of animating views is to use the 559 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 560 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 561 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 562 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 563 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 564 * makes animating these View properties particularly easy and efficient. 565 * </p> 566 * <p> 567 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 568 * You can attach an {@link Animation} object to a view using 569 * {@link #setAnimation(Animation)} or 570 * {@link #startAnimation(Animation)}. The animation can alter the scale, 571 * rotation, translation and alpha of a view over time. If the animation is 572 * attached to a view that has children, the animation will affect the entire 573 * subtree rooted by that node. When an animation is started, the framework will 574 * take care of redrawing the appropriate views until the animation completes. 575 * </p> 576 * 577 * <a name="Security"></a> 578 * <h3>Security</h3> 579 * <p> 580 * Sometimes it is essential that an application be able to verify that an action 581 * is being performed with the full knowledge and consent of the user, such as 582 * granting a permission request, making a purchase or clicking on an advertisement. 583 * Unfortunately, a malicious application could try to spoof the user into 584 * performing these actions, unaware, by concealing the intended purpose of the view. 585 * As a remedy, the framework offers a touch filtering mechanism that can be used to 586 * improve the security of views that provide access to sensitive functionality. 587 * </p><p> 588 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 589 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 590 * will discard touches that are received whenever the view's window is obscured by 591 * another visible window. As a result, the view will not receive touches whenever a 592 * toast, dialog or other window appears above the view's window. 593 * </p><p> 594 * For more fine-grained control over security, consider overriding the 595 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 596 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 597 * </p> 598 * 599 * @attr ref android.R.styleable#View_alpha 600 * @attr ref android.R.styleable#View_background 601 * @attr ref android.R.styleable#View_clickable 602 * @attr ref android.R.styleable#View_contentDescription 603 * @attr ref android.R.styleable#View_drawingCacheQuality 604 * @attr ref android.R.styleable#View_duplicateParentState 605 * @attr ref android.R.styleable#View_id 606 * @attr ref android.R.styleable#View_requiresFadingEdge 607 * @attr ref android.R.styleable#View_fadeScrollbars 608 * @attr ref android.R.styleable#View_fadingEdgeLength 609 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 610 * @attr ref android.R.styleable#View_fitsSystemWindows 611 * @attr ref android.R.styleable#View_isScrollContainer 612 * @attr ref android.R.styleable#View_focusable 613 * @attr ref android.R.styleable#View_focusableInTouchMode 614 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 615 * @attr ref android.R.styleable#View_keepScreenOn 616 * @attr ref android.R.styleable#View_layerType 617 * @attr ref android.R.styleable#View_longClickable 618 * @attr ref android.R.styleable#View_minHeight 619 * @attr ref android.R.styleable#View_minWidth 620 * @attr ref android.R.styleable#View_nextFocusDown 621 * @attr ref android.R.styleable#View_nextFocusLeft 622 * @attr ref android.R.styleable#View_nextFocusRight 623 * @attr ref android.R.styleable#View_nextFocusUp 624 * @attr ref android.R.styleable#View_onClick 625 * @attr ref android.R.styleable#View_padding 626 * @attr ref android.R.styleable#View_paddingBottom 627 * @attr ref android.R.styleable#View_paddingLeft 628 * @attr ref android.R.styleable#View_paddingRight 629 * @attr ref android.R.styleable#View_paddingTop 630 * @attr ref android.R.styleable#View_saveEnabled 631 * @attr ref android.R.styleable#View_rotation 632 * @attr ref android.R.styleable#View_rotationX 633 * @attr ref android.R.styleable#View_rotationY 634 * @attr ref android.R.styleable#View_scaleX 635 * @attr ref android.R.styleable#View_scaleY 636 * @attr ref android.R.styleable#View_scrollX 637 * @attr ref android.R.styleable#View_scrollY 638 * @attr ref android.R.styleable#View_scrollbarSize 639 * @attr ref android.R.styleable#View_scrollbarStyle 640 * @attr ref android.R.styleable#View_scrollbars 641 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 642 * @attr ref android.R.styleable#View_scrollbarFadeDuration 643 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 644 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 645 * @attr ref android.R.styleable#View_scrollbarThumbVertical 646 * @attr ref android.R.styleable#View_scrollbarTrackVertical 647 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 648 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 649 * @attr ref android.R.styleable#View_soundEffectsEnabled 650 * @attr ref android.R.styleable#View_tag 651 * @attr ref android.R.styleable#View_transformPivotX 652 * @attr ref android.R.styleable#View_transformPivotY 653 * @attr ref android.R.styleable#View_translationX 654 * @attr ref android.R.styleable#View_translationY 655 * @attr ref android.R.styleable#View_visibility 656 * 657 * @see android.view.ViewGroup 658 */ 659public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 660 AccessibilityEventSource { 661 private static final boolean DBG = false; 662 663 /** 664 * The logging tag used by this class with android.util.Log. 665 */ 666 protected static final String VIEW_LOG_TAG = "View"; 667 668 /** 669 * When set to true, apps will draw debugging information about their layouts. 670 * 671 * @hide 672 */ 673 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 674 675 /** 676 * Used to mark a View that has no ID. 677 */ 678 public static final int NO_ID = -1; 679 680 /** 681 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 682 * calling setFlags. 683 */ 684 private static final int NOT_FOCUSABLE = 0x00000000; 685 686 /** 687 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 688 * setFlags. 689 */ 690 private static final int FOCUSABLE = 0x00000001; 691 692 /** 693 * Mask for use with setFlags indicating bits used for focus. 694 */ 695 private static final int FOCUSABLE_MASK = 0x00000001; 696 697 /** 698 * This view will adjust its padding to fit sytem windows (e.g. status bar) 699 */ 700 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 701 702 /** 703 * This view is visible. 704 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 705 * android:visibility}. 706 */ 707 public static final int VISIBLE = 0x00000000; 708 709 /** 710 * This view is invisible, but it still takes up space for layout purposes. 711 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 712 * android:visibility}. 713 */ 714 public static final int INVISIBLE = 0x00000004; 715 716 /** 717 * This view is invisible, and it doesn't take any space for layout 718 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 719 * android:visibility}. 720 */ 721 public static final int GONE = 0x00000008; 722 723 /** 724 * Mask for use with setFlags indicating bits used for visibility. 725 * {@hide} 726 */ 727 static final int VISIBILITY_MASK = 0x0000000C; 728 729 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 730 731 /** 732 * This view is enabled. Interpretation varies by subclass. 733 * Use with ENABLED_MASK when calling setFlags. 734 * {@hide} 735 */ 736 static final int ENABLED = 0x00000000; 737 738 /** 739 * This view is disabled. Interpretation varies by subclass. 740 * Use with ENABLED_MASK when calling setFlags. 741 * {@hide} 742 */ 743 static final int DISABLED = 0x00000020; 744 745 /** 746 * Mask for use with setFlags indicating bits used for indicating whether 747 * this view is enabled 748 * {@hide} 749 */ 750 static final int ENABLED_MASK = 0x00000020; 751 752 /** 753 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 754 * called and further optimizations will be performed. It is okay to have 755 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 756 * {@hide} 757 */ 758 static final int WILL_NOT_DRAW = 0x00000080; 759 760 /** 761 * Mask for use with setFlags indicating bits used for indicating whether 762 * this view is will draw 763 * {@hide} 764 */ 765 static final int DRAW_MASK = 0x00000080; 766 767 /** 768 * <p>This view doesn't show scrollbars.</p> 769 * {@hide} 770 */ 771 static final int SCROLLBARS_NONE = 0x00000000; 772 773 /** 774 * <p>This view shows horizontal scrollbars.</p> 775 * {@hide} 776 */ 777 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 778 779 /** 780 * <p>This view shows vertical scrollbars.</p> 781 * {@hide} 782 */ 783 static final int SCROLLBARS_VERTICAL = 0x00000200; 784 785 /** 786 * <p>Mask for use with setFlags indicating bits used for indicating which 787 * scrollbars are enabled.</p> 788 * {@hide} 789 */ 790 static final int SCROLLBARS_MASK = 0x00000300; 791 792 /** 793 * Indicates that the view should filter touches when its window is obscured. 794 * Refer to the class comments for more information about this security feature. 795 * {@hide} 796 */ 797 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 798 799 /** 800 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 801 * that they are optional and should be skipped if the window has 802 * requested system UI flags that ignore those insets for layout. 803 */ 804 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 805 806 /** 807 * <p>This view doesn't show fading edges.</p> 808 * {@hide} 809 */ 810 static final int FADING_EDGE_NONE = 0x00000000; 811 812 /** 813 * <p>This view shows horizontal fading edges.</p> 814 * {@hide} 815 */ 816 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 817 818 /** 819 * <p>This view shows vertical fading edges.</p> 820 * {@hide} 821 */ 822 static final int FADING_EDGE_VERTICAL = 0x00002000; 823 824 /** 825 * <p>Mask for use with setFlags indicating bits used for indicating which 826 * fading edges are enabled.</p> 827 * {@hide} 828 */ 829 static final int FADING_EDGE_MASK = 0x00003000; 830 831 /** 832 * <p>Indicates this view can be clicked. When clickable, a View reacts 833 * to clicks by notifying the OnClickListener.<p> 834 * {@hide} 835 */ 836 static final int CLICKABLE = 0x00004000; 837 838 /** 839 * <p>Indicates this view is caching its drawing into a bitmap.</p> 840 * {@hide} 841 */ 842 static final int DRAWING_CACHE_ENABLED = 0x00008000; 843 844 /** 845 * <p>Indicates that no icicle should be saved for this view.<p> 846 * {@hide} 847 */ 848 static final int SAVE_DISABLED = 0x000010000; 849 850 /** 851 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 852 * property.</p> 853 * {@hide} 854 */ 855 static final int SAVE_DISABLED_MASK = 0x000010000; 856 857 /** 858 * <p>Indicates that no drawing cache should ever be created for this view.<p> 859 * {@hide} 860 */ 861 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 862 863 /** 864 * <p>Indicates this view can take / keep focus when int touch mode.</p> 865 * {@hide} 866 */ 867 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 868 869 /** 870 * <p>Enables low quality mode for the drawing cache.</p> 871 */ 872 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 873 874 /** 875 * <p>Enables high quality mode for the drawing cache.</p> 876 */ 877 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 878 879 /** 880 * <p>Enables automatic quality mode for the drawing cache.</p> 881 */ 882 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 883 884 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 885 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 886 }; 887 888 /** 889 * <p>Mask for use with setFlags indicating bits used for the cache 890 * quality property.</p> 891 * {@hide} 892 */ 893 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 894 895 /** 896 * <p> 897 * Indicates this view can be long clicked. When long clickable, a View 898 * reacts to long clicks by notifying the OnLongClickListener or showing a 899 * context menu. 900 * </p> 901 * {@hide} 902 */ 903 static final int LONG_CLICKABLE = 0x00200000; 904 905 /** 906 * <p>Indicates that this view gets its drawable states from its direct parent 907 * and ignores its original internal states.</p> 908 * 909 * @hide 910 */ 911 static final int DUPLICATE_PARENT_STATE = 0x00400000; 912 913 /** 914 * The scrollbar style to display the scrollbars inside the content area, 915 * without increasing the padding. The scrollbars will be overlaid with 916 * translucency on the view's content. 917 */ 918 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 919 920 /** 921 * The scrollbar style to display the scrollbars inside the padded area, 922 * increasing the padding of the view. The scrollbars will not overlap the 923 * content area of the view. 924 */ 925 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 926 927 /** 928 * The scrollbar style to display the scrollbars at the edge of the view, 929 * without increasing the padding. The scrollbars will be overlaid with 930 * translucency. 931 */ 932 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 933 934 /** 935 * The scrollbar style to display the scrollbars at the edge of the view, 936 * increasing the padding of the view. The scrollbars will only overlap the 937 * background, if any. 938 */ 939 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 940 941 /** 942 * Mask to check if the scrollbar style is overlay or inset. 943 * {@hide} 944 */ 945 static final int SCROLLBARS_INSET_MASK = 0x01000000; 946 947 /** 948 * Mask to check if the scrollbar style is inside or outside. 949 * {@hide} 950 */ 951 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 952 953 /** 954 * Mask for scrollbar style. 955 * {@hide} 956 */ 957 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 958 959 /** 960 * View flag indicating that the screen should remain on while the 961 * window containing this view is visible to the user. This effectively 962 * takes care of automatically setting the WindowManager's 963 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 964 */ 965 public static final int KEEP_SCREEN_ON = 0x04000000; 966 967 /** 968 * View flag indicating whether this view should have sound effects enabled 969 * for events such as clicking and touching. 970 */ 971 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 972 973 /** 974 * View flag indicating whether this view should have haptic feedback 975 * enabled for events such as long presses. 976 */ 977 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 978 979 /** 980 * <p>Indicates that the view hierarchy should stop saving state when 981 * it reaches this view. If state saving is initiated immediately at 982 * the view, it will be allowed. 983 * {@hide} 984 */ 985 static final int PARENT_SAVE_DISABLED = 0x20000000; 986 987 /** 988 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 989 * {@hide} 990 */ 991 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 992 993 /** 994 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 995 * should add all focusable Views regardless if they are focusable in touch mode. 996 */ 997 public static final int FOCUSABLES_ALL = 0x00000000; 998 999 /** 1000 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1001 * should add only Views focusable in touch mode. 1002 */ 1003 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1004 1005 /** 1006 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1007 * should add only accessibility focusable Views. 1008 * 1009 * @hide 1010 */ 1011 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1012 1013 /** 1014 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1015 * item. 1016 */ 1017 public static final int FOCUS_BACKWARD = 0x00000001; 1018 1019 /** 1020 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1021 * item. 1022 */ 1023 public static final int FOCUS_FORWARD = 0x00000002; 1024 1025 /** 1026 * Use with {@link #focusSearch(int)}. Move focus to the left. 1027 */ 1028 public static final int FOCUS_LEFT = 0x00000011; 1029 1030 /** 1031 * Use with {@link #focusSearch(int)}. Move focus up. 1032 */ 1033 public static final int FOCUS_UP = 0x00000021; 1034 1035 /** 1036 * Use with {@link #focusSearch(int)}. Move focus to the right. 1037 */ 1038 public static final int FOCUS_RIGHT = 0x00000042; 1039 1040 /** 1041 * Use with {@link #focusSearch(int)}. Move focus down. 1042 */ 1043 public static final int FOCUS_DOWN = 0x00000082; 1044 1045 // Accessibility focus directions. 1046 1047 /** 1048 * The accessibility focus which is the current user position when 1049 * interacting with the accessibility framework. 1050 */ 1051 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1052 1053 /** 1054 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1055 */ 1056 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1057 1058 /** 1059 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1060 */ 1061 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1062 1063 /** 1064 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1065 */ 1066 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1067 1068 /** 1069 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1070 */ 1071 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1072 1073 /** 1074 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1075 */ 1076 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1077 1078 /** 1079 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1080 */ 1081 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1082 1083 /** 1084 * Bits of {@link #getMeasuredWidthAndState()} and 1085 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1086 */ 1087 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1088 1089 /** 1090 * Bits of {@link #getMeasuredWidthAndState()} and 1091 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1092 */ 1093 public static final int MEASURED_STATE_MASK = 0xff000000; 1094 1095 /** 1096 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1097 * for functions that combine both width and height into a single int, 1098 * such as {@link #getMeasuredState()} and the childState argument of 1099 * {@link #resolveSizeAndState(int, int, int)}. 1100 */ 1101 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1102 1103 /** 1104 * Bit of {@link #getMeasuredWidthAndState()} and 1105 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1106 * is smaller that the space the view would like to have. 1107 */ 1108 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1109 1110 /** 1111 * Base View state sets 1112 */ 1113 // Singles 1114 /** 1115 * Indicates the view has no states set. States are used with 1116 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1117 * view depending on its state. 1118 * 1119 * @see android.graphics.drawable.Drawable 1120 * @see #getDrawableState() 1121 */ 1122 protected static final int[] EMPTY_STATE_SET; 1123 /** 1124 * Indicates the view is enabled. States are used with 1125 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1126 * view depending on its state. 1127 * 1128 * @see android.graphics.drawable.Drawable 1129 * @see #getDrawableState() 1130 */ 1131 protected static final int[] ENABLED_STATE_SET; 1132 /** 1133 * Indicates the view is focused. States are used with 1134 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1135 * view depending on its state. 1136 * 1137 * @see android.graphics.drawable.Drawable 1138 * @see #getDrawableState() 1139 */ 1140 protected static final int[] FOCUSED_STATE_SET; 1141 /** 1142 * Indicates the view is selected. States are used with 1143 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1144 * view depending on its state. 1145 * 1146 * @see android.graphics.drawable.Drawable 1147 * @see #getDrawableState() 1148 */ 1149 protected static final int[] SELECTED_STATE_SET; 1150 /** 1151 * Indicates the view is pressed. States are used with 1152 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1153 * view depending on its state. 1154 * 1155 * @see android.graphics.drawable.Drawable 1156 * @see #getDrawableState() 1157 * @hide 1158 */ 1159 protected static final int[] PRESSED_STATE_SET; 1160 /** 1161 * Indicates the view's window has focus. States are used with 1162 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1163 * view depending on its state. 1164 * 1165 * @see android.graphics.drawable.Drawable 1166 * @see #getDrawableState() 1167 */ 1168 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1169 // Doubles 1170 /** 1171 * Indicates the view is enabled and has the focus. 1172 * 1173 * @see #ENABLED_STATE_SET 1174 * @see #FOCUSED_STATE_SET 1175 */ 1176 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1177 /** 1178 * Indicates the view is enabled and selected. 1179 * 1180 * @see #ENABLED_STATE_SET 1181 * @see #SELECTED_STATE_SET 1182 */ 1183 protected static final int[] ENABLED_SELECTED_STATE_SET; 1184 /** 1185 * Indicates the view is enabled and that its window has focus. 1186 * 1187 * @see #ENABLED_STATE_SET 1188 * @see #WINDOW_FOCUSED_STATE_SET 1189 */ 1190 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1191 /** 1192 * Indicates the view is focused and selected. 1193 * 1194 * @see #FOCUSED_STATE_SET 1195 * @see #SELECTED_STATE_SET 1196 */ 1197 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1198 /** 1199 * Indicates the view has the focus and that its window has the focus. 1200 * 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is selected and that its window has the focus. 1207 * 1208 * @see #SELECTED_STATE_SET 1209 * @see #WINDOW_FOCUSED_STATE_SET 1210 */ 1211 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1212 // Triples 1213 /** 1214 * Indicates the view is enabled, focused and selected. 1215 * 1216 * @see #ENABLED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 */ 1220 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1221 /** 1222 * Indicates the view is enabled, focused and its window has the focus. 1223 * 1224 * @see #ENABLED_STATE_SET 1225 * @see #FOCUSED_STATE_SET 1226 * @see #WINDOW_FOCUSED_STATE_SET 1227 */ 1228 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1229 /** 1230 * Indicates the view is enabled, selected and its window has the focus. 1231 * 1232 * @see #ENABLED_STATE_SET 1233 * @see #SELECTED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is focused, selected and its window has the focus. 1239 * 1240 * @see #FOCUSED_STATE_SET 1241 * @see #SELECTED_STATE_SET 1242 * @see #WINDOW_FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is enabled, focused, selected and its window 1247 * has the focus. 1248 * 1249 * @see #ENABLED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed and its window has the focus. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #WINDOW_FOCUSED_STATE_SET 1260 */ 1261 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1262 /** 1263 * Indicates the view is pressed and selected. 1264 * 1265 * @see #PRESSED_STATE_SET 1266 * @see #SELECTED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #SELECTED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed and focused. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #FOCUSED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, focused and its window has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #FOCUSED_STATE_SET 1289 * @see #WINDOW_FOCUSED_STATE_SET 1290 */ 1291 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1292 /** 1293 * Indicates the view is pressed, focused and selected. 1294 * 1295 * @see #PRESSED_STATE_SET 1296 * @see #SELECTED_STATE_SET 1297 * @see #FOCUSED_STATE_SET 1298 */ 1299 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1300 /** 1301 * Indicates the view is pressed, focused, selected and its window has the focus. 1302 * 1303 * @see #PRESSED_STATE_SET 1304 * @see #FOCUSED_STATE_SET 1305 * @see #SELECTED_STATE_SET 1306 * @see #WINDOW_FOCUSED_STATE_SET 1307 */ 1308 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1309 /** 1310 * Indicates the view is pressed and enabled. 1311 * 1312 * @see #PRESSED_STATE_SET 1313 * @see #ENABLED_STATE_SET 1314 */ 1315 protected static final int[] PRESSED_ENABLED_STATE_SET; 1316 /** 1317 * Indicates the view is pressed, enabled and its window has the focus. 1318 * 1319 * @see #PRESSED_STATE_SET 1320 * @see #ENABLED_STATE_SET 1321 * @see #WINDOW_FOCUSED_STATE_SET 1322 */ 1323 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1324 /** 1325 * Indicates the view is pressed, enabled and selected. 1326 * 1327 * @see #PRESSED_STATE_SET 1328 * @see #ENABLED_STATE_SET 1329 * @see #SELECTED_STATE_SET 1330 */ 1331 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1332 /** 1333 * Indicates the view is pressed, enabled, selected and its window has the 1334 * focus. 1335 * 1336 * @see #PRESSED_STATE_SET 1337 * @see #ENABLED_STATE_SET 1338 * @see #SELECTED_STATE_SET 1339 * @see #WINDOW_FOCUSED_STATE_SET 1340 */ 1341 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1342 /** 1343 * Indicates the view is pressed, enabled and focused. 1344 * 1345 * @see #PRESSED_STATE_SET 1346 * @see #ENABLED_STATE_SET 1347 * @see #FOCUSED_STATE_SET 1348 */ 1349 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1350 /** 1351 * Indicates the view is pressed, enabled, focused and its window has the 1352 * focus. 1353 * 1354 * @see #PRESSED_STATE_SET 1355 * @see #ENABLED_STATE_SET 1356 * @see #FOCUSED_STATE_SET 1357 * @see #WINDOW_FOCUSED_STATE_SET 1358 */ 1359 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1360 /** 1361 * Indicates the view is pressed, enabled, focused and selected. 1362 * 1363 * @see #PRESSED_STATE_SET 1364 * @see #ENABLED_STATE_SET 1365 * @see #SELECTED_STATE_SET 1366 * @see #FOCUSED_STATE_SET 1367 */ 1368 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1369 /** 1370 * Indicates the view is pressed, enabled, focused, selected and its window 1371 * has the focus. 1372 * 1373 * @see #PRESSED_STATE_SET 1374 * @see #ENABLED_STATE_SET 1375 * @see #SELECTED_STATE_SET 1376 * @see #FOCUSED_STATE_SET 1377 * @see #WINDOW_FOCUSED_STATE_SET 1378 */ 1379 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1380 1381 /** 1382 * The order here is very important to {@link #getDrawableState()} 1383 */ 1384 private static final int[][] VIEW_STATE_SETS; 1385 1386 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1387 static final int VIEW_STATE_SELECTED = 1 << 1; 1388 static final int VIEW_STATE_FOCUSED = 1 << 2; 1389 static final int VIEW_STATE_ENABLED = 1 << 3; 1390 static final int VIEW_STATE_PRESSED = 1 << 4; 1391 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1392 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1393 static final int VIEW_STATE_HOVERED = 1 << 7; 1394 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1395 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1396 1397 static final int[] VIEW_STATE_IDS = new int[] { 1398 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1399 R.attr.state_selected, VIEW_STATE_SELECTED, 1400 R.attr.state_focused, VIEW_STATE_FOCUSED, 1401 R.attr.state_enabled, VIEW_STATE_ENABLED, 1402 R.attr.state_pressed, VIEW_STATE_PRESSED, 1403 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1404 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1405 R.attr.state_hovered, VIEW_STATE_HOVERED, 1406 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1407 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1408 }; 1409 1410 static { 1411 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1412 throw new IllegalStateException( 1413 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1414 } 1415 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1416 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1417 int viewState = R.styleable.ViewDrawableStates[i]; 1418 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1419 if (VIEW_STATE_IDS[j] == viewState) { 1420 orderedIds[i * 2] = viewState; 1421 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1422 } 1423 } 1424 } 1425 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1426 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1427 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1428 int numBits = Integer.bitCount(i); 1429 int[] set = new int[numBits]; 1430 int pos = 0; 1431 for (int j = 0; j < orderedIds.length; j += 2) { 1432 if ((i & orderedIds[j+1]) != 0) { 1433 set[pos++] = orderedIds[j]; 1434 } 1435 } 1436 VIEW_STATE_SETS[i] = set; 1437 } 1438 1439 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1440 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1441 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1442 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1444 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1445 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1447 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1449 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1451 | VIEW_STATE_FOCUSED]; 1452 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1453 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1455 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1456 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1457 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_ENABLED]; 1460 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1462 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1464 | VIEW_STATE_ENABLED]; 1465 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1467 | VIEW_STATE_ENABLED]; 1468 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1471 1472 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1473 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1475 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1476 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1477 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1479 | VIEW_STATE_PRESSED]; 1480 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1482 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1483 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1484 | VIEW_STATE_PRESSED]; 1485 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1486 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1487 | VIEW_STATE_PRESSED]; 1488 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1489 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1490 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1491 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1492 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1493 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1494 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1495 | VIEW_STATE_PRESSED]; 1496 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1497 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1498 | VIEW_STATE_PRESSED]; 1499 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1500 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1501 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1502 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1503 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1504 | VIEW_STATE_PRESSED]; 1505 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1506 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1507 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1508 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1509 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1510 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1511 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1512 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1513 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1514 | VIEW_STATE_PRESSED]; 1515 } 1516 1517 /** 1518 * Accessibility event types that are dispatched for text population. 1519 */ 1520 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1521 AccessibilityEvent.TYPE_VIEW_CLICKED 1522 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1523 | AccessibilityEvent.TYPE_VIEW_SELECTED 1524 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1525 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1526 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1527 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1528 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1529 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1530 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED 1531 | AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY; 1532 1533 /** 1534 * Temporary Rect currently for use in setBackground(). This will probably 1535 * be extended in the future to hold our own class with more than just 1536 * a Rect. :) 1537 */ 1538 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1539 1540 /** 1541 * Map used to store views' tags. 1542 */ 1543 private SparseArray<Object> mKeyedTags; 1544 1545 /** 1546 * The next available accessiiblity id. 1547 */ 1548 private static int sNextAccessibilityViewId; 1549 1550 /** 1551 * The animation currently associated with this view. 1552 * @hide 1553 */ 1554 protected Animation mCurrentAnimation = null; 1555 1556 /** 1557 * Width as measured during measure pass. 1558 * {@hide} 1559 */ 1560 @ViewDebug.ExportedProperty(category = "measurement") 1561 int mMeasuredWidth; 1562 1563 /** 1564 * Height as measured during measure pass. 1565 * {@hide} 1566 */ 1567 @ViewDebug.ExportedProperty(category = "measurement") 1568 int mMeasuredHeight; 1569 1570 /** 1571 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1572 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1573 * its display list. This flag, used only when hw accelerated, allows us to clear the 1574 * flag while retaining this information until it's needed (at getDisplayList() time and 1575 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1576 * 1577 * {@hide} 1578 */ 1579 boolean mRecreateDisplayList = false; 1580 1581 /** 1582 * The view's identifier. 1583 * {@hide} 1584 * 1585 * @see #setId(int) 1586 * @see #getId() 1587 */ 1588 @ViewDebug.ExportedProperty(resolveId = true) 1589 int mID = NO_ID; 1590 1591 /** 1592 * The stable ID of this view for accessibility purposes. 1593 */ 1594 int mAccessibilityViewId = NO_ID; 1595 1596 /** 1597 * @hide 1598 */ 1599 private int mAccessibilityCursorPosition = -1; 1600 1601 /** 1602 * The view's tag. 1603 * {@hide} 1604 * 1605 * @see #setTag(Object) 1606 * @see #getTag() 1607 */ 1608 protected Object mTag; 1609 1610 // for mPrivateFlags: 1611 /** {@hide} */ 1612 static final int WANTS_FOCUS = 0x00000001; 1613 /** {@hide} */ 1614 static final int FOCUSED = 0x00000002; 1615 /** {@hide} */ 1616 static final int SELECTED = 0x00000004; 1617 /** {@hide} */ 1618 static final int IS_ROOT_NAMESPACE = 0x00000008; 1619 /** {@hide} */ 1620 static final int HAS_BOUNDS = 0x00000010; 1621 /** {@hide} */ 1622 static final int DRAWN = 0x00000020; 1623 /** 1624 * When this flag is set, this view is running an animation on behalf of its 1625 * children and should therefore not cancel invalidate requests, even if they 1626 * lie outside of this view's bounds. 1627 * 1628 * {@hide} 1629 */ 1630 static final int DRAW_ANIMATION = 0x00000040; 1631 /** {@hide} */ 1632 static final int SKIP_DRAW = 0x00000080; 1633 /** {@hide} */ 1634 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1635 /** {@hide} */ 1636 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1637 /** {@hide} */ 1638 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1639 /** {@hide} */ 1640 static final int MEASURED_DIMENSION_SET = 0x00000800; 1641 /** {@hide} */ 1642 static final int FORCE_LAYOUT = 0x00001000; 1643 /** {@hide} */ 1644 static final int LAYOUT_REQUIRED = 0x00002000; 1645 1646 private static final int PRESSED = 0x00004000; 1647 1648 /** {@hide} */ 1649 static final int DRAWING_CACHE_VALID = 0x00008000; 1650 /** 1651 * Flag used to indicate that this view should be drawn once more (and only once 1652 * more) after its animation has completed. 1653 * {@hide} 1654 */ 1655 static final int ANIMATION_STARTED = 0x00010000; 1656 1657 private static final int SAVE_STATE_CALLED = 0x00020000; 1658 1659 /** 1660 * Indicates that the View returned true when onSetAlpha() was called and that 1661 * the alpha must be restored. 1662 * {@hide} 1663 */ 1664 static final int ALPHA_SET = 0x00040000; 1665 1666 /** 1667 * Set by {@link #setScrollContainer(boolean)}. 1668 */ 1669 static final int SCROLL_CONTAINER = 0x00080000; 1670 1671 /** 1672 * Set by {@link #setScrollContainer(boolean)}. 1673 */ 1674 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1675 1676 /** 1677 * View flag indicating whether this view was invalidated (fully or partially.) 1678 * 1679 * @hide 1680 */ 1681 static final int DIRTY = 0x00200000; 1682 1683 /** 1684 * View flag indicating whether this view was invalidated by an opaque 1685 * invalidate request. 1686 * 1687 * @hide 1688 */ 1689 static final int DIRTY_OPAQUE = 0x00400000; 1690 1691 /** 1692 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1693 * 1694 * @hide 1695 */ 1696 static final int DIRTY_MASK = 0x00600000; 1697 1698 /** 1699 * Indicates whether the background is opaque. 1700 * 1701 * @hide 1702 */ 1703 static final int OPAQUE_BACKGROUND = 0x00800000; 1704 1705 /** 1706 * Indicates whether the scrollbars are opaque. 1707 * 1708 * @hide 1709 */ 1710 static final int OPAQUE_SCROLLBARS = 0x01000000; 1711 1712 /** 1713 * Indicates whether the view is opaque. 1714 * 1715 * @hide 1716 */ 1717 static final int OPAQUE_MASK = 0x01800000; 1718 1719 /** 1720 * Indicates a prepressed state; 1721 * the short time between ACTION_DOWN and recognizing 1722 * a 'real' press. Prepressed is used to recognize quick taps 1723 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1724 * 1725 * @hide 1726 */ 1727 private static final int PREPRESSED = 0x02000000; 1728 1729 /** 1730 * Indicates whether the view is temporarily detached. 1731 * 1732 * @hide 1733 */ 1734 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1735 1736 /** 1737 * Indicates that we should awaken scroll bars once attached 1738 * 1739 * @hide 1740 */ 1741 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1742 1743 /** 1744 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1745 * @hide 1746 */ 1747 private static final int HOVERED = 0x10000000; 1748 1749 /** 1750 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1751 * for transform operations 1752 * 1753 * @hide 1754 */ 1755 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1756 1757 /** {@hide} */ 1758 static final int ACTIVATED = 0x40000000; 1759 1760 /** 1761 * Indicates that this view was specifically invalidated, not just dirtied because some 1762 * child view was invalidated. The flag is used to determine when we need to recreate 1763 * a view's display list (as opposed to just returning a reference to its existing 1764 * display list). 1765 * 1766 * @hide 1767 */ 1768 static final int INVALIDATED = 0x80000000; 1769 1770 /* Masks for mPrivateFlags2 */ 1771 1772 /** 1773 * Indicates that this view has reported that it can accept the current drag's content. 1774 * Cleared when the drag operation concludes. 1775 * @hide 1776 */ 1777 static final int DRAG_CAN_ACCEPT = 0x00000001; 1778 1779 /** 1780 * Indicates that this view is currently directly under the drag location in a 1781 * drag-and-drop operation involving content that it can accept. Cleared when 1782 * the drag exits the view, or when the drag operation concludes. 1783 * @hide 1784 */ 1785 static final int DRAG_HOVERED = 0x00000002; 1786 1787 /** 1788 * Horizontal layout direction of this view is from Left to Right. 1789 * Use with {@link #setLayoutDirection}. 1790 * @hide 1791 */ 1792 public static final int LAYOUT_DIRECTION_LTR = 0; 1793 1794 /** 1795 * Horizontal layout direction of this view is from Right to Left. 1796 * Use with {@link #setLayoutDirection}. 1797 * @hide 1798 */ 1799 public static final int LAYOUT_DIRECTION_RTL = 1; 1800 1801 /** 1802 * Horizontal layout direction of this view is inherited from its parent. 1803 * Use with {@link #setLayoutDirection}. 1804 * @hide 1805 */ 1806 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1807 1808 /** 1809 * Horizontal layout direction of this view is from deduced from the default language 1810 * script for the locale. Use with {@link #setLayoutDirection}. 1811 * @hide 1812 */ 1813 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1814 1815 /** 1816 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1817 * @hide 1818 */ 1819 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1820 1821 /** 1822 * Mask for use with private flags indicating bits used for horizontal layout direction. 1823 * @hide 1824 */ 1825 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1826 1827 /** 1828 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1829 * right-to-left direction. 1830 * @hide 1831 */ 1832 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1833 1834 /** 1835 * Indicates whether the view horizontal layout direction has been resolved. 1836 * @hide 1837 */ 1838 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1839 1840 /** 1841 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1842 * @hide 1843 */ 1844 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1845 1846 /* 1847 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1848 * flag value. 1849 * @hide 1850 */ 1851 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1852 LAYOUT_DIRECTION_LTR, 1853 LAYOUT_DIRECTION_RTL, 1854 LAYOUT_DIRECTION_INHERIT, 1855 LAYOUT_DIRECTION_LOCALE 1856 }; 1857 1858 /** 1859 * Default horizontal layout direction. 1860 * @hide 1861 */ 1862 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1863 1864 /** 1865 * Indicates that the view is tracking some sort of transient state 1866 * that the app should not need to be aware of, but that the framework 1867 * should take special care to preserve. 1868 * 1869 * @hide 1870 */ 1871 static final int HAS_TRANSIENT_STATE = 0x00000100; 1872 1873 1874 /** 1875 * Text direction is inherited thru {@link ViewGroup} 1876 * @hide 1877 */ 1878 public static final int TEXT_DIRECTION_INHERIT = 0; 1879 1880 /** 1881 * Text direction is using "first strong algorithm". The first strong directional character 1882 * determines the paragraph direction. If there is no strong directional character, the 1883 * paragraph direction is the view's resolved layout direction. 1884 * @hide 1885 */ 1886 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1887 1888 /** 1889 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1890 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1891 * If there are neither, the paragraph direction is the view's resolved layout direction. 1892 * @hide 1893 */ 1894 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1895 1896 /** 1897 * Text direction is forced to LTR. 1898 * @hide 1899 */ 1900 public static final int TEXT_DIRECTION_LTR = 3; 1901 1902 /** 1903 * Text direction is forced to RTL. 1904 * @hide 1905 */ 1906 public static final int TEXT_DIRECTION_RTL = 4; 1907 1908 /** 1909 * Text direction is coming from the system Locale. 1910 * @hide 1911 */ 1912 public static final int TEXT_DIRECTION_LOCALE = 5; 1913 1914 /** 1915 * Default text direction is inherited 1916 * @hide 1917 */ 1918 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1919 1920 /** 1921 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1922 * @hide 1923 */ 1924 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1925 1926 /** 1927 * Mask for use with private flags indicating bits used for text direction. 1928 * @hide 1929 */ 1930 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1931 1932 /** 1933 * Array of text direction flags for mapping attribute "textDirection" to correct 1934 * flag value. 1935 * @hide 1936 */ 1937 private static final int[] TEXT_DIRECTION_FLAGS = { 1938 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1939 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1940 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1941 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1942 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1943 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1944 }; 1945 1946 /** 1947 * Indicates whether the view text direction has been resolved. 1948 * @hide 1949 */ 1950 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1951 1952 /** 1953 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1954 * @hide 1955 */ 1956 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1957 1958 /** 1959 * Mask for use with private flags indicating bits used for resolved text direction. 1960 * @hide 1961 */ 1962 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1963 1964 /** 1965 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1966 * @hide 1967 */ 1968 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1969 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1970 1971 /* 1972 * Default text alignment. The text alignment of this View is inherited from its parent. 1973 * Use with {@link #setTextAlignment(int)} 1974 * @hide 1975 */ 1976 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1977 1978 /** 1979 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1980 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1981 * 1982 * Use with {@link #setTextAlignment(int)} 1983 * @hide 1984 */ 1985 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1986 1987 /** 1988 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1989 * 1990 * Use with {@link #setTextAlignment(int)} 1991 * @hide 1992 */ 1993 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1994 1995 /** 1996 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1997 * 1998 * Use with {@link #setTextAlignment(int)} 1999 * @hide 2000 */ 2001 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 2002 2003 /** 2004 * Center the paragraph, e.g. ALIGN_CENTER. 2005 * 2006 * Use with {@link #setTextAlignment(int)} 2007 * @hide 2008 */ 2009 public static final int TEXT_ALIGNMENT_CENTER = 4; 2010 2011 /** 2012 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2013 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2014 * 2015 * Use with {@link #setTextAlignment(int)} 2016 * @hide 2017 */ 2018 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2019 2020 /** 2021 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2022 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2023 * 2024 * Use with {@link #setTextAlignment(int)} 2025 * @hide 2026 */ 2027 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2028 2029 /** 2030 * Default text alignment is inherited 2031 * @hide 2032 */ 2033 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2034 2035 /** 2036 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2037 * @hide 2038 */ 2039 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2040 2041 /** 2042 * Mask for use with private flags indicating bits used for text alignment. 2043 * @hide 2044 */ 2045 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2046 2047 /** 2048 * Array of text direction flags for mapping attribute "textAlignment" to correct 2049 * flag value. 2050 * @hide 2051 */ 2052 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2053 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2054 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2055 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2056 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2057 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2058 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2059 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2060 }; 2061 2062 /** 2063 * Indicates whether the view text alignment has been resolved. 2064 * @hide 2065 */ 2066 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2067 2068 /** 2069 * Bit shift to get the resolved text alignment. 2070 * @hide 2071 */ 2072 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2073 2074 /** 2075 * Mask for use with private flags indicating bits used for text alignment. 2076 * @hide 2077 */ 2078 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2079 2080 /** 2081 * Indicates whether if the view text alignment has been resolved to gravity 2082 */ 2083 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2084 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2085 2086 // Accessiblity constants for mPrivateFlags2 2087 2088 /** 2089 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2090 */ 2091 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2092 2093 /** 2094 * Automatically determine whether a view is important for accessibility. 2095 */ 2096 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2097 2098 /** 2099 * The view is important for accessibility. 2100 */ 2101 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2102 2103 /** 2104 * The view is not important for accessibility. 2105 */ 2106 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2107 2108 /** 2109 * The default whether the view is important for accessiblity. 2110 */ 2111 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2112 2113 /** 2114 * Mask for obtainig the bits which specify how to determine 2115 * whether a view is important for accessibility. 2116 */ 2117 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2118 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2119 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2120 2121 /** 2122 * Flag indicating whether a view has accessibility focus. 2123 */ 2124 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2125 2126 /** 2127 * Flag indicating whether a view state for accessibility has changed. 2128 */ 2129 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2130 2131 /** 2132 * Flag indicating that view has an animation set on it. This is used to track whether an 2133 * animation is cleared between successive frames, in order to tell the associated 2134 * DisplayList to clear its animation matrix. 2135 */ 2136 static final int VIEW_IS_ANIMATING_TRANSFORM = 0x10000000; 2137 2138 /** 2139 * Flag indicating whether a view failed the quickReject() check in draw(). This condition 2140 * is used to check whether later changes to the view's transform should invalidate the 2141 * view to force the quickReject test to run again. 2142 */ 2143 static final int VIEW_QUICK_REJECTED = 0x20000000; 2144 2145 /* End of masks for mPrivateFlags2 */ 2146 2147 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2148 2149 /** 2150 * Always allow a user to over-scroll this view, provided it is a 2151 * view that can scroll. 2152 * 2153 * @see #getOverScrollMode() 2154 * @see #setOverScrollMode(int) 2155 */ 2156 public static final int OVER_SCROLL_ALWAYS = 0; 2157 2158 /** 2159 * Allow a user to over-scroll this view only if the content is large 2160 * enough to meaningfully scroll, provided it is a view that can scroll. 2161 * 2162 * @see #getOverScrollMode() 2163 * @see #setOverScrollMode(int) 2164 */ 2165 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2166 2167 /** 2168 * Never allow a user to over-scroll this view. 2169 * 2170 * @see #getOverScrollMode() 2171 * @see #setOverScrollMode(int) 2172 */ 2173 public static final int OVER_SCROLL_NEVER = 2; 2174 2175 /** 2176 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2177 * requested the system UI (status bar) to be visible (the default). 2178 * 2179 * @see #setSystemUiVisibility(int) 2180 */ 2181 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2182 2183 /** 2184 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2185 * system UI to enter an unobtrusive "low profile" mode. 2186 * 2187 * <p>This is for use in games, book readers, video players, or any other 2188 * "immersive" application where the usual system chrome is deemed too distracting. 2189 * 2190 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2191 * 2192 * @see #setSystemUiVisibility(int) 2193 */ 2194 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2195 2196 /** 2197 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2198 * system navigation be temporarily hidden. 2199 * 2200 * <p>This is an even less obtrusive state than that called for by 2201 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2202 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2203 * those to disappear. This is useful (in conjunction with the 2204 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2205 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2206 * window flags) for displaying content using every last pixel on the display. 2207 * 2208 * <p>There is a limitation: because navigation controls are so important, the least user 2209 * interaction will cause them to reappear immediately. When this happens, both 2210 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2211 * so that both elements reappear at the same time. 2212 * 2213 * @see #setSystemUiVisibility(int) 2214 */ 2215 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2216 2217 /** 2218 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2219 * into the normal fullscreen mode so that its content can take over the screen 2220 * while still allowing the user to interact with the application. 2221 * 2222 * <p>This has the same visual effect as 2223 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2224 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2225 * meaning that non-critical screen decorations (such as the status bar) will be 2226 * hidden while the user is in the View's window, focusing the experience on 2227 * that content. Unlike the window flag, if you are using ActionBar in 2228 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2229 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2230 * hide the action bar. 2231 * 2232 * <p>This approach to going fullscreen is best used over the window flag when 2233 * it is a transient state -- that is, the application does this at certain 2234 * points in its user interaction where it wants to allow the user to focus 2235 * on content, but not as a continuous state. For situations where the application 2236 * would like to simply stay full screen the entire time (such as a game that 2237 * wants to take over the screen), the 2238 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2239 * is usually a better approach. The state set here will be removed by the system 2240 * in various situations (such as the user moving to another application) like 2241 * the other system UI states. 2242 * 2243 * <p>When using this flag, the application should provide some easy facility 2244 * for the user to go out of it. A common example would be in an e-book 2245 * reader, where tapping on the screen brings back whatever screen and UI 2246 * decorations that had been hidden while the user was immersed in reading 2247 * the book. 2248 * 2249 * @see #setSystemUiVisibility(int) 2250 */ 2251 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2252 2253 /** 2254 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2255 * flags, we would like a stable view of the content insets given to 2256 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2257 * will always represent the worst case that the application can expect 2258 * as a continuous state. In the stock Android UI this is the space for 2259 * the system bar, nav bar, and status bar, but not more transient elements 2260 * such as an input method. 2261 * 2262 * The stable layout your UI sees is based on the system UI modes you can 2263 * switch to. That is, if you specify {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 2264 * then you will get a stable layout for changes of the 2265 * {@link #SYSTEM_UI_FLAG_FULLSCREEN} mode; if you specify 2266 * {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} and 2267 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, then you can transition 2268 * to {@link #SYSTEM_UI_FLAG_FULLSCREEN} and {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION} 2269 * with a stable layout. (Note that you should avoid using 2270 * {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} by itself.) 2271 * 2272 * If you have set the window flag {@ WindowManager.LayoutParams#FLAG_FULLSCREEN} 2273 * to hide the status bar (instead of using {@link #SYSTEM_UI_FLAG_FULLSCREEN}), 2274 * then a hidden status bar will be considered a "stable" state for purposes 2275 * here. This allows your UI to continually hide the status bar, while still 2276 * using the system UI flags to hide the action bar while still retaining 2277 * a stable layout. Note that changing the window fullscreen flag will never 2278 * provide a stable layout for a clean transition. 2279 * 2280 * <p>If you are using ActionBar in 2281 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2282 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2283 * insets it adds to those given to the application. 2284 */ 2285 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2286 2287 /** 2288 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2289 * to be layed out as if it has requested 2290 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2291 * allows it to avoid artifacts when switching in and out of that mode, at 2292 * the expense that some of its user interface may be covered by screen 2293 * decorations when they are shown. You can perform layout of your inner 2294 * UI elements to account for the navagation system UI through the 2295 * {@link #fitSystemWindows(Rect)} method. 2296 */ 2297 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2298 2299 /** 2300 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2301 * to be layed out as if it has requested 2302 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2303 * allows it to avoid artifacts when switching in and out of that mode, at 2304 * the expense that some of its user interface may be covered by screen 2305 * decorations when they are shown. You can perform layout of your inner 2306 * UI elements to account for non-fullscreen system UI through the 2307 * {@link #fitSystemWindows(Rect)} method. 2308 */ 2309 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2310 2311 /** 2312 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2313 */ 2314 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2315 2316 /** 2317 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2318 */ 2319 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2320 2321 /** 2322 * @hide 2323 * 2324 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2325 * out of the public fields to keep the undefined bits out of the developer's way. 2326 * 2327 * Flag to make the status bar not expandable. Unless you also 2328 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2329 */ 2330 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2331 2332 /** 2333 * @hide 2334 * 2335 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2336 * out of the public fields to keep the undefined bits out of the developer's way. 2337 * 2338 * Flag to hide notification icons and scrolling ticker text. 2339 */ 2340 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2341 2342 /** 2343 * @hide 2344 * 2345 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2346 * out of the public fields to keep the undefined bits out of the developer's way. 2347 * 2348 * Flag to disable incoming notification alerts. This will not block 2349 * icons, but it will block sound, vibrating and other visual or aural notifications. 2350 */ 2351 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2352 2353 /** 2354 * @hide 2355 * 2356 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2357 * out of the public fields to keep the undefined bits out of the developer's way. 2358 * 2359 * Flag to hide only the scrolling ticker. Note that 2360 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2361 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2362 */ 2363 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2364 2365 /** 2366 * @hide 2367 * 2368 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2369 * out of the public fields to keep the undefined bits out of the developer's way. 2370 * 2371 * Flag to hide the center system info area. 2372 */ 2373 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2374 2375 /** 2376 * @hide 2377 * 2378 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2379 * out of the public fields to keep the undefined bits out of the developer's way. 2380 * 2381 * Flag to hide only the home button. Don't use this 2382 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2383 */ 2384 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2385 2386 /** 2387 * @hide 2388 * 2389 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2390 * out of the public fields to keep the undefined bits out of the developer's way. 2391 * 2392 * Flag to hide only the back button. Don't use this 2393 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2394 */ 2395 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2396 2397 /** 2398 * @hide 2399 * 2400 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2401 * out of the public fields to keep the undefined bits out of the developer's way. 2402 * 2403 * Flag to hide only the clock. You might use this if your activity has 2404 * its own clock making the status bar's clock redundant. 2405 */ 2406 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2407 2408 /** 2409 * @hide 2410 * 2411 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2412 * out of the public fields to keep the undefined bits out of the developer's way. 2413 * 2414 * Flag to hide only the recent apps button. Don't use this 2415 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2416 */ 2417 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2418 2419 /** 2420 * @hide 2421 */ 2422 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2423 2424 /** 2425 * These are the system UI flags that can be cleared by events outside 2426 * of an application. Currently this is just the ability to tap on the 2427 * screen while hiding the navigation bar to have it return. 2428 * @hide 2429 */ 2430 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2431 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2432 | SYSTEM_UI_FLAG_FULLSCREEN; 2433 2434 /** 2435 * Flags that can impact the layout in relation to system UI. 2436 */ 2437 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2438 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2439 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2440 2441 /** 2442 * Find views that render the specified text. 2443 * 2444 * @see #findViewsWithText(ArrayList, CharSequence, int) 2445 */ 2446 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2447 2448 /** 2449 * Find find views that contain the specified content description. 2450 * 2451 * @see #findViewsWithText(ArrayList, CharSequence, int) 2452 */ 2453 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2454 2455 /** 2456 * Find views that contain {@link AccessibilityNodeProvider}. Such 2457 * a View is a root of virtual view hierarchy and may contain the searched 2458 * text. If this flag is set Views with providers are automatically 2459 * added and it is a responsibility of the client to call the APIs of 2460 * the provider to determine whether the virtual tree rooted at this View 2461 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2462 * represeting the virtual views with this text. 2463 * 2464 * @see #findViewsWithText(ArrayList, CharSequence, int) 2465 * 2466 * @hide 2467 */ 2468 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2469 2470 /** 2471 * Indicates that the screen has changed state and is now off. 2472 * 2473 * @see #onScreenStateChanged(int) 2474 */ 2475 public static final int SCREEN_STATE_OFF = 0x0; 2476 2477 /** 2478 * Indicates that the screen has changed state and is now on. 2479 * 2480 * @see #onScreenStateChanged(int) 2481 */ 2482 public static final int SCREEN_STATE_ON = 0x1; 2483 2484 /** 2485 * Controls the over-scroll mode for this view. 2486 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2487 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2488 * and {@link #OVER_SCROLL_NEVER}. 2489 */ 2490 private int mOverScrollMode; 2491 2492 /** 2493 * The parent this view is attached to. 2494 * {@hide} 2495 * 2496 * @see #getParent() 2497 */ 2498 protected ViewParent mParent; 2499 2500 /** 2501 * {@hide} 2502 */ 2503 AttachInfo mAttachInfo; 2504 2505 /** 2506 * {@hide} 2507 */ 2508 @ViewDebug.ExportedProperty(flagMapping = { 2509 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2510 name = "FORCE_LAYOUT"), 2511 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2512 name = "LAYOUT_REQUIRED"), 2513 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2514 name = "DRAWING_CACHE_INVALID", outputIf = false), 2515 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2516 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2517 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2518 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2519 }) 2520 int mPrivateFlags; 2521 int mPrivateFlags2; 2522 2523 /** 2524 * This view's request for the visibility of the status bar. 2525 * @hide 2526 */ 2527 @ViewDebug.ExportedProperty(flagMapping = { 2528 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2529 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2530 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2531 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2532 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2533 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2534 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2535 equals = SYSTEM_UI_FLAG_VISIBLE, 2536 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2537 }) 2538 int mSystemUiVisibility; 2539 2540 /** 2541 * Reference count for transient state. 2542 * @see #setHasTransientState(boolean) 2543 */ 2544 int mTransientStateCount = 0; 2545 2546 /** 2547 * Count of how many windows this view has been attached to. 2548 */ 2549 int mWindowAttachCount; 2550 2551 /** 2552 * The layout parameters associated with this view and used by the parent 2553 * {@link android.view.ViewGroup} to determine how this view should be 2554 * laid out. 2555 * {@hide} 2556 */ 2557 protected ViewGroup.LayoutParams mLayoutParams; 2558 2559 /** 2560 * The view flags hold various views states. 2561 * {@hide} 2562 */ 2563 @ViewDebug.ExportedProperty 2564 int mViewFlags; 2565 2566 static class TransformationInfo { 2567 /** 2568 * The transform matrix for the View. This transform is calculated internally 2569 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2570 * is used by default. Do *not* use this variable directly; instead call 2571 * getMatrix(), which will automatically recalculate the matrix if necessary 2572 * to get the correct matrix based on the latest rotation and scale properties. 2573 */ 2574 private final Matrix mMatrix = new Matrix(); 2575 2576 /** 2577 * The transform matrix for the View. This transform is calculated internally 2578 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2579 * is used by default. Do *not* use this variable directly; instead call 2580 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2581 * to get the correct matrix based on the latest rotation and scale properties. 2582 */ 2583 private Matrix mInverseMatrix; 2584 2585 /** 2586 * An internal variable that tracks whether we need to recalculate the 2587 * transform matrix, based on whether the rotation or scaleX/Y properties 2588 * have changed since the matrix was last calculated. 2589 */ 2590 boolean mMatrixDirty = false; 2591 2592 /** 2593 * An internal variable that tracks whether we need to recalculate the 2594 * transform matrix, based on whether the rotation or scaleX/Y properties 2595 * have changed since the matrix was last calculated. 2596 */ 2597 private boolean mInverseMatrixDirty = true; 2598 2599 /** 2600 * A variable that tracks whether we need to recalculate the 2601 * transform matrix, based on whether the rotation or scaleX/Y properties 2602 * have changed since the matrix was last calculated. This variable 2603 * is only valid after a call to updateMatrix() or to a function that 2604 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2605 */ 2606 private boolean mMatrixIsIdentity = true; 2607 2608 /** 2609 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2610 */ 2611 private Camera mCamera = null; 2612 2613 /** 2614 * This matrix is used when computing the matrix for 3D rotations. 2615 */ 2616 private Matrix matrix3D = null; 2617 2618 /** 2619 * These prev values are used to recalculate a centered pivot point when necessary. The 2620 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2621 * set), so thes values are only used then as well. 2622 */ 2623 private int mPrevWidth = -1; 2624 private int mPrevHeight = -1; 2625 2626 /** 2627 * The degrees rotation around the vertical axis through the pivot point. 2628 */ 2629 @ViewDebug.ExportedProperty 2630 float mRotationY = 0f; 2631 2632 /** 2633 * The degrees rotation around the horizontal axis through the pivot point. 2634 */ 2635 @ViewDebug.ExportedProperty 2636 float mRotationX = 0f; 2637 2638 /** 2639 * The degrees rotation around the pivot point. 2640 */ 2641 @ViewDebug.ExportedProperty 2642 float mRotation = 0f; 2643 2644 /** 2645 * The amount of translation of the object away from its left property (post-layout). 2646 */ 2647 @ViewDebug.ExportedProperty 2648 float mTranslationX = 0f; 2649 2650 /** 2651 * The amount of translation of the object away from its top property (post-layout). 2652 */ 2653 @ViewDebug.ExportedProperty 2654 float mTranslationY = 0f; 2655 2656 /** 2657 * The amount of scale in the x direction around the pivot point. A 2658 * value of 1 means no scaling is applied. 2659 */ 2660 @ViewDebug.ExportedProperty 2661 float mScaleX = 1f; 2662 2663 /** 2664 * The amount of scale in the y direction around the pivot point. A 2665 * value of 1 means no scaling is applied. 2666 */ 2667 @ViewDebug.ExportedProperty 2668 float mScaleY = 1f; 2669 2670 /** 2671 * The x location of the point around which the view is rotated and scaled. 2672 */ 2673 @ViewDebug.ExportedProperty 2674 float mPivotX = 0f; 2675 2676 /** 2677 * The y location of the point around which the view is rotated and scaled. 2678 */ 2679 @ViewDebug.ExportedProperty 2680 float mPivotY = 0f; 2681 2682 /** 2683 * The opacity of the View. This is a value from 0 to 1, where 0 means 2684 * completely transparent and 1 means completely opaque. 2685 */ 2686 @ViewDebug.ExportedProperty 2687 float mAlpha = 1f; 2688 } 2689 2690 TransformationInfo mTransformationInfo; 2691 2692 private boolean mLastIsOpaque; 2693 2694 /** 2695 * Convenience value to check for float values that are close enough to zero to be considered 2696 * zero. 2697 */ 2698 private static final float NONZERO_EPSILON = .001f; 2699 2700 /** 2701 * The distance in pixels from the left edge of this view's parent 2702 * to the left edge of this view. 2703 * {@hide} 2704 */ 2705 @ViewDebug.ExportedProperty(category = "layout") 2706 protected int mLeft; 2707 /** 2708 * The distance in pixels from the left edge of this view's parent 2709 * to the right edge of this view. 2710 * {@hide} 2711 */ 2712 @ViewDebug.ExportedProperty(category = "layout") 2713 protected int mRight; 2714 /** 2715 * The distance in pixels from the top edge of this view's parent 2716 * to the top edge of this view. 2717 * {@hide} 2718 */ 2719 @ViewDebug.ExportedProperty(category = "layout") 2720 protected int mTop; 2721 /** 2722 * The distance in pixels from the top edge of this view's parent 2723 * to the bottom edge of this view. 2724 * {@hide} 2725 */ 2726 @ViewDebug.ExportedProperty(category = "layout") 2727 protected int mBottom; 2728 2729 /** 2730 * The offset, in pixels, by which the content of this view is scrolled 2731 * horizontally. 2732 * {@hide} 2733 */ 2734 @ViewDebug.ExportedProperty(category = "scrolling") 2735 protected int mScrollX; 2736 /** 2737 * The offset, in pixels, by which the content of this view is scrolled 2738 * vertically. 2739 * {@hide} 2740 */ 2741 @ViewDebug.ExportedProperty(category = "scrolling") 2742 protected int mScrollY; 2743 2744 /** 2745 * The left padding in pixels, that is the distance in pixels between the 2746 * left edge of this view and the left edge of its content. 2747 * {@hide} 2748 */ 2749 @ViewDebug.ExportedProperty(category = "padding") 2750 protected int mPaddingLeft; 2751 /** 2752 * The right padding in pixels, that is the distance in pixels between the 2753 * right edge of this view and the right edge of its content. 2754 * {@hide} 2755 */ 2756 @ViewDebug.ExportedProperty(category = "padding") 2757 protected int mPaddingRight; 2758 /** 2759 * The top padding in pixels, that is the distance in pixels between the 2760 * top edge of this view and the top edge of its content. 2761 * {@hide} 2762 */ 2763 @ViewDebug.ExportedProperty(category = "padding") 2764 protected int mPaddingTop; 2765 /** 2766 * The bottom padding in pixels, that is the distance in pixels between the 2767 * bottom edge of this view and the bottom edge of its content. 2768 * {@hide} 2769 */ 2770 @ViewDebug.ExportedProperty(category = "padding") 2771 protected int mPaddingBottom; 2772 2773 /** 2774 * The layout insets in pixels, that is the distance in pixels between the 2775 * visible edges of this view its bounds. 2776 */ 2777 private Insets mLayoutInsets; 2778 2779 /** 2780 * Briefly describes the view and is primarily used for accessibility support. 2781 */ 2782 private CharSequence mContentDescription; 2783 2784 /** 2785 * Cache the paddingRight set by the user to append to the scrollbar's size. 2786 * 2787 * @hide 2788 */ 2789 @ViewDebug.ExportedProperty(category = "padding") 2790 protected int mUserPaddingRight; 2791 2792 /** 2793 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2794 * 2795 * @hide 2796 */ 2797 @ViewDebug.ExportedProperty(category = "padding") 2798 protected int mUserPaddingBottom; 2799 2800 /** 2801 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2802 * 2803 * @hide 2804 */ 2805 @ViewDebug.ExportedProperty(category = "padding") 2806 protected int mUserPaddingLeft; 2807 2808 /** 2809 * Cache if the user padding is relative. 2810 * 2811 */ 2812 @ViewDebug.ExportedProperty(category = "padding") 2813 boolean mUserPaddingRelative; 2814 2815 /** 2816 * Cache the paddingStart set by the user to append to the scrollbar's size. 2817 * 2818 */ 2819 @ViewDebug.ExportedProperty(category = "padding") 2820 int mUserPaddingStart; 2821 2822 /** 2823 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2824 * 2825 */ 2826 @ViewDebug.ExportedProperty(category = "padding") 2827 int mUserPaddingEnd; 2828 2829 /** 2830 * @hide 2831 */ 2832 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2833 /** 2834 * @hide 2835 */ 2836 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2837 2838 private Drawable mBackground; 2839 2840 private int mBackgroundResource; 2841 private boolean mBackgroundSizeChanged; 2842 2843 static class ListenerInfo { 2844 /** 2845 * Listener used to dispatch focus change events. 2846 * This field should be made private, so it is hidden from the SDK. 2847 * {@hide} 2848 */ 2849 protected OnFocusChangeListener mOnFocusChangeListener; 2850 2851 /** 2852 * Listeners for layout change events. 2853 */ 2854 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2855 2856 /** 2857 * Listeners for attach events. 2858 */ 2859 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2860 2861 /** 2862 * Listener used to dispatch click events. 2863 * This field should be made private, so it is hidden from the SDK. 2864 * {@hide} 2865 */ 2866 public OnClickListener mOnClickListener; 2867 2868 /** 2869 * Listener used to dispatch long click events. 2870 * This field should be made private, so it is hidden from the SDK. 2871 * {@hide} 2872 */ 2873 protected OnLongClickListener mOnLongClickListener; 2874 2875 /** 2876 * Listener used to build the context menu. 2877 * This field should be made private, so it is hidden from the SDK. 2878 * {@hide} 2879 */ 2880 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2881 2882 private OnKeyListener mOnKeyListener; 2883 2884 private OnTouchListener mOnTouchListener; 2885 2886 private OnHoverListener mOnHoverListener; 2887 2888 private OnGenericMotionListener mOnGenericMotionListener; 2889 2890 private OnDragListener mOnDragListener; 2891 2892 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2893 } 2894 2895 ListenerInfo mListenerInfo; 2896 2897 /** 2898 * The application environment this view lives in. 2899 * This field should be made private, so it is hidden from the SDK. 2900 * {@hide} 2901 */ 2902 protected Context mContext; 2903 2904 private final Resources mResources; 2905 2906 private ScrollabilityCache mScrollCache; 2907 2908 private int[] mDrawableState = null; 2909 2910 /** 2911 * Set to true when drawing cache is enabled and cannot be created. 2912 * 2913 * @hide 2914 */ 2915 public boolean mCachingFailed; 2916 2917 private Bitmap mDrawingCache; 2918 private Bitmap mUnscaledDrawingCache; 2919 private HardwareLayer mHardwareLayer; 2920 DisplayList mDisplayList; 2921 2922 /** 2923 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2924 * the user may specify which view to go to next. 2925 */ 2926 private int mNextFocusLeftId = View.NO_ID; 2927 2928 /** 2929 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2930 * the user may specify which view to go to next. 2931 */ 2932 private int mNextFocusRightId = View.NO_ID; 2933 2934 /** 2935 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2936 * the user may specify which view to go to next. 2937 */ 2938 private int mNextFocusUpId = View.NO_ID; 2939 2940 /** 2941 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2942 * the user may specify which view to go to next. 2943 */ 2944 private int mNextFocusDownId = View.NO_ID; 2945 2946 /** 2947 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2948 * the user may specify which view to go to next. 2949 */ 2950 int mNextFocusForwardId = View.NO_ID; 2951 2952 private CheckForLongPress mPendingCheckForLongPress; 2953 private CheckForTap mPendingCheckForTap = null; 2954 private PerformClick mPerformClick; 2955 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2956 2957 private UnsetPressedState mUnsetPressedState; 2958 2959 /** 2960 * Whether the long press's action has been invoked. The tap's action is invoked on the 2961 * up event while a long press is invoked as soon as the long press duration is reached, so 2962 * a long press could be performed before the tap is checked, in which case the tap's action 2963 * should not be invoked. 2964 */ 2965 private boolean mHasPerformedLongPress; 2966 2967 /** 2968 * The minimum height of the view. We'll try our best to have the height 2969 * of this view to at least this amount. 2970 */ 2971 @ViewDebug.ExportedProperty(category = "measurement") 2972 private int mMinHeight; 2973 2974 /** 2975 * The minimum width of the view. We'll try our best to have the width 2976 * of this view to at least this amount. 2977 */ 2978 @ViewDebug.ExportedProperty(category = "measurement") 2979 private int mMinWidth; 2980 2981 /** 2982 * The delegate to handle touch events that are physically in this view 2983 * but should be handled by another view. 2984 */ 2985 private TouchDelegate mTouchDelegate = null; 2986 2987 /** 2988 * Solid color to use as a background when creating the drawing cache. Enables 2989 * the cache to use 16 bit bitmaps instead of 32 bit. 2990 */ 2991 private int mDrawingCacheBackgroundColor = 0; 2992 2993 /** 2994 * Special tree observer used when mAttachInfo is null. 2995 */ 2996 private ViewTreeObserver mFloatingTreeObserver; 2997 2998 /** 2999 * Cache the touch slop from the context that created the view. 3000 */ 3001 private int mTouchSlop; 3002 3003 /** 3004 * Object that handles automatic animation of view properties. 3005 */ 3006 private ViewPropertyAnimator mAnimator = null; 3007 3008 /** 3009 * Flag indicating that a drag can cross window boundaries. When 3010 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 3011 * with this flag set, all visible applications will be able to participate 3012 * in the drag operation and receive the dragged content. 3013 * 3014 * @hide 3015 */ 3016 public static final int DRAG_FLAG_GLOBAL = 1; 3017 3018 /** 3019 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 3020 */ 3021 private float mVerticalScrollFactor; 3022 3023 /** 3024 * Position of the vertical scroll bar. 3025 */ 3026 private int mVerticalScrollbarPosition; 3027 3028 /** 3029 * Position the scroll bar at the default position as determined by the system. 3030 */ 3031 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 3032 3033 /** 3034 * Position the scroll bar along the left edge. 3035 */ 3036 public static final int SCROLLBAR_POSITION_LEFT = 1; 3037 3038 /** 3039 * Position the scroll bar along the right edge. 3040 */ 3041 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3042 3043 /** 3044 * Indicates that the view does not have a layer. 3045 * 3046 * @see #getLayerType() 3047 * @see #setLayerType(int, android.graphics.Paint) 3048 * @see #LAYER_TYPE_SOFTWARE 3049 * @see #LAYER_TYPE_HARDWARE 3050 */ 3051 public static final int LAYER_TYPE_NONE = 0; 3052 3053 /** 3054 * <p>Indicates that the view has a software layer. A software layer is backed 3055 * by a bitmap and causes the view to be rendered using Android's software 3056 * rendering pipeline, even if hardware acceleration is enabled.</p> 3057 * 3058 * <p>Software layers have various usages:</p> 3059 * <p>When the application is not using hardware acceleration, a software layer 3060 * is useful to apply a specific color filter and/or blending mode and/or 3061 * translucency to a view and all its children.</p> 3062 * <p>When the application is using hardware acceleration, a software layer 3063 * is useful to render drawing primitives not supported by the hardware 3064 * accelerated pipeline. It can also be used to cache a complex view tree 3065 * into a texture and reduce the complexity of drawing operations. For instance, 3066 * when animating a complex view tree with a translation, a software layer can 3067 * be used to render the view tree only once.</p> 3068 * <p>Software layers should be avoided when the affected view tree updates 3069 * often. Every update will require to re-render the software layer, which can 3070 * potentially be slow (particularly when hardware acceleration is turned on 3071 * since the layer will have to be uploaded into a hardware texture after every 3072 * update.)</p> 3073 * 3074 * @see #getLayerType() 3075 * @see #setLayerType(int, android.graphics.Paint) 3076 * @see #LAYER_TYPE_NONE 3077 * @see #LAYER_TYPE_HARDWARE 3078 */ 3079 public static final int LAYER_TYPE_SOFTWARE = 1; 3080 3081 /** 3082 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3083 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3084 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3085 * rendering pipeline, but only if hardware acceleration is turned on for the 3086 * view hierarchy. When hardware acceleration is turned off, hardware layers 3087 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3088 * 3089 * <p>A hardware layer is useful to apply a specific color filter and/or 3090 * blending mode and/or translucency to a view and all its children.</p> 3091 * <p>A hardware layer can be used to cache a complex view tree into a 3092 * texture and reduce the complexity of drawing operations. For instance, 3093 * when animating a complex view tree with a translation, a hardware layer can 3094 * be used to render the view tree only once.</p> 3095 * <p>A hardware layer can also be used to increase the rendering quality when 3096 * rotation transformations are applied on a view. It can also be used to 3097 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3098 * 3099 * @see #getLayerType() 3100 * @see #setLayerType(int, android.graphics.Paint) 3101 * @see #LAYER_TYPE_NONE 3102 * @see #LAYER_TYPE_SOFTWARE 3103 */ 3104 public static final int LAYER_TYPE_HARDWARE = 2; 3105 3106 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3107 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3108 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3109 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3110 }) 3111 int mLayerType = LAYER_TYPE_NONE; 3112 Paint mLayerPaint; 3113 Rect mLocalDirtyRect; 3114 3115 /** 3116 * Set to true when the view is sending hover accessibility events because it 3117 * is the innermost hovered view. 3118 */ 3119 private boolean mSendingHoverAccessibilityEvents; 3120 3121 /** 3122 * Simple constructor to use when creating a view from code. 3123 * 3124 * @param context The Context the view is running in, through which it can 3125 * access the current theme, resources, etc. 3126 */ 3127 public View(Context context) { 3128 mContext = context; 3129 mResources = context != null ? context.getResources() : null; 3130 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3131 // Set layout and text direction defaults 3132 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3133 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3134 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3135 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3136 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3137 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3138 mUserPaddingStart = -1; 3139 mUserPaddingEnd = -1; 3140 mUserPaddingRelative = false; 3141 } 3142 3143 /** 3144 * Delegate for injecting accessiblity functionality. 3145 */ 3146 AccessibilityDelegate mAccessibilityDelegate; 3147 3148 /** 3149 * Consistency verifier for debugging purposes. 3150 * @hide 3151 */ 3152 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3153 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3154 new InputEventConsistencyVerifier(this, 0) : null; 3155 3156 /** 3157 * Constructor that is called when inflating a view from XML. This is called 3158 * when a view is being constructed from an XML file, supplying attributes 3159 * that were specified in the XML file. This version uses a default style of 3160 * 0, so the only attribute values applied are those in the Context's Theme 3161 * and the given AttributeSet. 3162 * 3163 * <p> 3164 * The method onFinishInflate() will be called after all children have been 3165 * added. 3166 * 3167 * @param context The Context the view is running in, through which it can 3168 * access the current theme, resources, etc. 3169 * @param attrs The attributes of the XML tag that is inflating the view. 3170 * @see #View(Context, AttributeSet, int) 3171 */ 3172 public View(Context context, AttributeSet attrs) { 3173 this(context, attrs, 0); 3174 } 3175 3176 /** 3177 * Perform inflation from XML and apply a class-specific base style. This 3178 * constructor of View allows subclasses to use their own base style when 3179 * they are inflating. For example, a Button class's constructor would call 3180 * this version of the super class constructor and supply 3181 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3182 * the theme's button style to modify all of the base view attributes (in 3183 * particular its background) as well as the Button class's attributes. 3184 * 3185 * @param context The Context the view is running in, through which it can 3186 * access the current theme, resources, etc. 3187 * @param attrs The attributes of the XML tag that is inflating the view. 3188 * @param defStyle The default style to apply to this view. If 0, no style 3189 * will be applied (beyond what is included in the theme). This may 3190 * either be an attribute resource, whose value will be retrieved 3191 * from the current theme, or an explicit style resource. 3192 * @see #View(Context, AttributeSet) 3193 */ 3194 public View(Context context, AttributeSet attrs, int defStyle) { 3195 this(context); 3196 3197 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3198 defStyle, 0); 3199 3200 Drawable background = null; 3201 3202 int leftPadding = -1; 3203 int topPadding = -1; 3204 int rightPadding = -1; 3205 int bottomPadding = -1; 3206 int startPadding = -1; 3207 int endPadding = -1; 3208 3209 int padding = -1; 3210 3211 int viewFlagValues = 0; 3212 int viewFlagMasks = 0; 3213 3214 boolean setScrollContainer = false; 3215 3216 int x = 0; 3217 int y = 0; 3218 3219 float tx = 0; 3220 float ty = 0; 3221 float rotation = 0; 3222 float rotationX = 0; 3223 float rotationY = 0; 3224 float sx = 1f; 3225 float sy = 1f; 3226 boolean transformSet = false; 3227 3228 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3229 3230 int overScrollMode = mOverScrollMode; 3231 final int N = a.getIndexCount(); 3232 for (int i = 0; i < N; i++) { 3233 int attr = a.getIndex(i); 3234 switch (attr) { 3235 case com.android.internal.R.styleable.View_background: 3236 background = a.getDrawable(attr); 3237 break; 3238 case com.android.internal.R.styleable.View_padding: 3239 padding = a.getDimensionPixelSize(attr, -1); 3240 break; 3241 case com.android.internal.R.styleable.View_paddingLeft: 3242 leftPadding = a.getDimensionPixelSize(attr, -1); 3243 break; 3244 case com.android.internal.R.styleable.View_paddingTop: 3245 topPadding = a.getDimensionPixelSize(attr, -1); 3246 break; 3247 case com.android.internal.R.styleable.View_paddingRight: 3248 rightPadding = a.getDimensionPixelSize(attr, -1); 3249 break; 3250 case com.android.internal.R.styleable.View_paddingBottom: 3251 bottomPadding = a.getDimensionPixelSize(attr, -1); 3252 break; 3253 case com.android.internal.R.styleable.View_paddingStart: 3254 startPadding = a.getDimensionPixelSize(attr, -1); 3255 break; 3256 case com.android.internal.R.styleable.View_paddingEnd: 3257 endPadding = a.getDimensionPixelSize(attr, -1); 3258 break; 3259 case com.android.internal.R.styleable.View_scrollX: 3260 x = a.getDimensionPixelOffset(attr, 0); 3261 break; 3262 case com.android.internal.R.styleable.View_scrollY: 3263 y = a.getDimensionPixelOffset(attr, 0); 3264 break; 3265 case com.android.internal.R.styleable.View_alpha: 3266 setAlpha(a.getFloat(attr, 1f)); 3267 break; 3268 case com.android.internal.R.styleable.View_transformPivotX: 3269 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3270 break; 3271 case com.android.internal.R.styleable.View_transformPivotY: 3272 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3273 break; 3274 case com.android.internal.R.styleable.View_translationX: 3275 tx = a.getDimensionPixelOffset(attr, 0); 3276 transformSet = true; 3277 break; 3278 case com.android.internal.R.styleable.View_translationY: 3279 ty = a.getDimensionPixelOffset(attr, 0); 3280 transformSet = true; 3281 break; 3282 case com.android.internal.R.styleable.View_rotation: 3283 rotation = a.getFloat(attr, 0); 3284 transformSet = true; 3285 break; 3286 case com.android.internal.R.styleable.View_rotationX: 3287 rotationX = a.getFloat(attr, 0); 3288 transformSet = true; 3289 break; 3290 case com.android.internal.R.styleable.View_rotationY: 3291 rotationY = a.getFloat(attr, 0); 3292 transformSet = true; 3293 break; 3294 case com.android.internal.R.styleable.View_scaleX: 3295 sx = a.getFloat(attr, 1f); 3296 transformSet = true; 3297 break; 3298 case com.android.internal.R.styleable.View_scaleY: 3299 sy = a.getFloat(attr, 1f); 3300 transformSet = true; 3301 break; 3302 case com.android.internal.R.styleable.View_id: 3303 mID = a.getResourceId(attr, NO_ID); 3304 break; 3305 case com.android.internal.R.styleable.View_tag: 3306 mTag = a.getText(attr); 3307 break; 3308 case com.android.internal.R.styleable.View_fitsSystemWindows: 3309 if (a.getBoolean(attr, false)) { 3310 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3311 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3312 } 3313 break; 3314 case com.android.internal.R.styleable.View_focusable: 3315 if (a.getBoolean(attr, false)) { 3316 viewFlagValues |= FOCUSABLE; 3317 viewFlagMasks |= FOCUSABLE_MASK; 3318 } 3319 break; 3320 case com.android.internal.R.styleable.View_focusableInTouchMode: 3321 if (a.getBoolean(attr, false)) { 3322 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3323 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3324 } 3325 break; 3326 case com.android.internal.R.styleable.View_clickable: 3327 if (a.getBoolean(attr, false)) { 3328 viewFlagValues |= CLICKABLE; 3329 viewFlagMasks |= CLICKABLE; 3330 } 3331 break; 3332 case com.android.internal.R.styleable.View_longClickable: 3333 if (a.getBoolean(attr, false)) { 3334 viewFlagValues |= LONG_CLICKABLE; 3335 viewFlagMasks |= LONG_CLICKABLE; 3336 } 3337 break; 3338 case com.android.internal.R.styleable.View_saveEnabled: 3339 if (!a.getBoolean(attr, true)) { 3340 viewFlagValues |= SAVE_DISABLED; 3341 viewFlagMasks |= SAVE_DISABLED_MASK; 3342 } 3343 break; 3344 case com.android.internal.R.styleable.View_duplicateParentState: 3345 if (a.getBoolean(attr, false)) { 3346 viewFlagValues |= DUPLICATE_PARENT_STATE; 3347 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3348 } 3349 break; 3350 case com.android.internal.R.styleable.View_visibility: 3351 final int visibility = a.getInt(attr, 0); 3352 if (visibility != 0) { 3353 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3354 viewFlagMasks |= VISIBILITY_MASK; 3355 } 3356 break; 3357 case com.android.internal.R.styleable.View_layoutDirection: 3358 // Clear any layout direction flags (included resolved bits) already set 3359 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3360 // Set the layout direction flags depending on the value of the attribute 3361 final int layoutDirection = a.getInt(attr, -1); 3362 final int value = (layoutDirection != -1) ? 3363 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3364 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3365 break; 3366 case com.android.internal.R.styleable.View_drawingCacheQuality: 3367 final int cacheQuality = a.getInt(attr, 0); 3368 if (cacheQuality != 0) { 3369 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3370 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3371 } 3372 break; 3373 case com.android.internal.R.styleable.View_contentDescription: 3374 mContentDescription = a.getString(attr); 3375 break; 3376 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3377 if (!a.getBoolean(attr, true)) { 3378 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3379 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3380 } 3381 break; 3382 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3383 if (!a.getBoolean(attr, true)) { 3384 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3385 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3386 } 3387 break; 3388 case R.styleable.View_scrollbars: 3389 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3390 if (scrollbars != SCROLLBARS_NONE) { 3391 viewFlagValues |= scrollbars; 3392 viewFlagMasks |= SCROLLBARS_MASK; 3393 initializeScrollbars(a); 3394 } 3395 break; 3396 //noinspection deprecation 3397 case R.styleable.View_fadingEdge: 3398 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3399 // Ignore the attribute starting with ICS 3400 break; 3401 } 3402 // With builds < ICS, fall through and apply fading edges 3403 case R.styleable.View_requiresFadingEdge: 3404 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3405 if (fadingEdge != FADING_EDGE_NONE) { 3406 viewFlagValues |= fadingEdge; 3407 viewFlagMasks |= FADING_EDGE_MASK; 3408 initializeFadingEdge(a); 3409 } 3410 break; 3411 case R.styleable.View_scrollbarStyle: 3412 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3413 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3414 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3415 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3416 } 3417 break; 3418 case R.styleable.View_isScrollContainer: 3419 setScrollContainer = true; 3420 if (a.getBoolean(attr, false)) { 3421 setScrollContainer(true); 3422 } 3423 break; 3424 case com.android.internal.R.styleable.View_keepScreenOn: 3425 if (a.getBoolean(attr, false)) { 3426 viewFlagValues |= KEEP_SCREEN_ON; 3427 viewFlagMasks |= KEEP_SCREEN_ON; 3428 } 3429 break; 3430 case R.styleable.View_filterTouchesWhenObscured: 3431 if (a.getBoolean(attr, false)) { 3432 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3433 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3434 } 3435 break; 3436 case R.styleable.View_nextFocusLeft: 3437 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3438 break; 3439 case R.styleable.View_nextFocusRight: 3440 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3441 break; 3442 case R.styleable.View_nextFocusUp: 3443 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3444 break; 3445 case R.styleable.View_nextFocusDown: 3446 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3447 break; 3448 case R.styleable.View_nextFocusForward: 3449 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3450 break; 3451 case R.styleable.View_minWidth: 3452 mMinWidth = a.getDimensionPixelSize(attr, 0); 3453 break; 3454 case R.styleable.View_minHeight: 3455 mMinHeight = a.getDimensionPixelSize(attr, 0); 3456 break; 3457 case R.styleable.View_onClick: 3458 if (context.isRestricted()) { 3459 throw new IllegalStateException("The android:onClick attribute cannot " 3460 + "be used within a restricted context"); 3461 } 3462 3463 final String handlerName = a.getString(attr); 3464 if (handlerName != null) { 3465 setOnClickListener(new OnClickListener() { 3466 private Method mHandler; 3467 3468 public void onClick(View v) { 3469 if (mHandler == null) { 3470 try { 3471 mHandler = getContext().getClass().getMethod(handlerName, 3472 View.class); 3473 } catch (NoSuchMethodException e) { 3474 int id = getId(); 3475 String idText = id == NO_ID ? "" : " with id '" 3476 + getContext().getResources().getResourceEntryName( 3477 id) + "'"; 3478 throw new IllegalStateException("Could not find a method " + 3479 handlerName + "(View) in the activity " 3480 + getContext().getClass() + " for onClick handler" 3481 + " on view " + View.this.getClass() + idText, e); 3482 } 3483 } 3484 3485 try { 3486 mHandler.invoke(getContext(), View.this); 3487 } catch (IllegalAccessException e) { 3488 throw new IllegalStateException("Could not execute non " 3489 + "public method of the activity", e); 3490 } catch (InvocationTargetException e) { 3491 throw new IllegalStateException("Could not execute " 3492 + "method of the activity", e); 3493 } 3494 } 3495 }); 3496 } 3497 break; 3498 case R.styleable.View_overScrollMode: 3499 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3500 break; 3501 case R.styleable.View_verticalScrollbarPosition: 3502 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3503 break; 3504 case R.styleable.View_layerType: 3505 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3506 break; 3507 case R.styleable.View_textDirection: 3508 // Clear any text direction flag already set 3509 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3510 // Set the text direction flags depending on the value of the attribute 3511 final int textDirection = a.getInt(attr, -1); 3512 if (textDirection != -1) { 3513 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3514 } 3515 break; 3516 case R.styleable.View_textAlignment: 3517 // Clear any text alignment flag already set 3518 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3519 // Set the text alignment flag depending on the value of the attribute 3520 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3521 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3522 break; 3523 case R.styleable.View_importantForAccessibility: 3524 setImportantForAccessibility(a.getInt(attr, 3525 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3526 } 3527 } 3528 3529 a.recycle(); 3530 3531 setOverScrollMode(overScrollMode); 3532 3533 if (background != null) { 3534 setBackground(background); 3535 } 3536 3537 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3538 // layout direction). Those cached values will be used later during padding resolution. 3539 mUserPaddingStart = startPadding; 3540 mUserPaddingEnd = endPadding; 3541 3542 updateUserPaddingRelative(); 3543 3544 if (padding >= 0) { 3545 leftPadding = padding; 3546 topPadding = padding; 3547 rightPadding = padding; 3548 bottomPadding = padding; 3549 } 3550 3551 // If the user specified the padding (either with android:padding or 3552 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3553 // use the default padding or the padding from the background drawable 3554 // (stored at this point in mPadding*) 3555 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3556 topPadding >= 0 ? topPadding : mPaddingTop, 3557 rightPadding >= 0 ? rightPadding : mPaddingRight, 3558 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3559 3560 if (viewFlagMasks != 0) { 3561 setFlags(viewFlagValues, viewFlagMasks); 3562 } 3563 3564 // Needs to be called after mViewFlags is set 3565 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3566 recomputePadding(); 3567 } 3568 3569 if (x != 0 || y != 0) { 3570 scrollTo(x, y); 3571 } 3572 3573 if (transformSet) { 3574 setTranslationX(tx); 3575 setTranslationY(ty); 3576 setRotation(rotation); 3577 setRotationX(rotationX); 3578 setRotationY(rotationY); 3579 setScaleX(sx); 3580 setScaleY(sy); 3581 } 3582 3583 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3584 setScrollContainer(true); 3585 } 3586 3587 computeOpaqueFlags(); 3588 } 3589 3590 private void updateUserPaddingRelative() { 3591 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3592 } 3593 3594 /** 3595 * Non-public constructor for use in testing 3596 */ 3597 View() { 3598 mResources = null; 3599 } 3600 3601 /** 3602 * <p> 3603 * Initializes the fading edges from a given set of styled attributes. This 3604 * method should be called by subclasses that need fading edges and when an 3605 * instance of these subclasses is created programmatically rather than 3606 * being inflated from XML. This method is automatically called when the XML 3607 * is inflated. 3608 * </p> 3609 * 3610 * @param a the styled attributes set to initialize the fading edges from 3611 */ 3612 protected void initializeFadingEdge(TypedArray a) { 3613 initScrollCache(); 3614 3615 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3616 R.styleable.View_fadingEdgeLength, 3617 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3618 } 3619 3620 /** 3621 * Returns the size of the vertical faded edges used to indicate that more 3622 * content in this view is visible. 3623 * 3624 * @return The size in pixels of the vertical faded edge or 0 if vertical 3625 * faded edges are not enabled for this view. 3626 * @attr ref android.R.styleable#View_fadingEdgeLength 3627 */ 3628 public int getVerticalFadingEdgeLength() { 3629 if (isVerticalFadingEdgeEnabled()) { 3630 ScrollabilityCache cache = mScrollCache; 3631 if (cache != null) { 3632 return cache.fadingEdgeLength; 3633 } 3634 } 3635 return 0; 3636 } 3637 3638 /** 3639 * Set the size of the faded edge used to indicate that more content in this 3640 * view is available. Will not change whether the fading edge is enabled; use 3641 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3642 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3643 * for the vertical or horizontal fading edges. 3644 * 3645 * @param length The size in pixels of the faded edge used to indicate that more 3646 * content in this view is visible. 3647 */ 3648 public void setFadingEdgeLength(int length) { 3649 initScrollCache(); 3650 mScrollCache.fadingEdgeLength = length; 3651 } 3652 3653 /** 3654 * Returns the size of the horizontal faded edges used to indicate that more 3655 * content in this view is visible. 3656 * 3657 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3658 * faded edges are not enabled for this view. 3659 * @attr ref android.R.styleable#View_fadingEdgeLength 3660 */ 3661 public int getHorizontalFadingEdgeLength() { 3662 if (isHorizontalFadingEdgeEnabled()) { 3663 ScrollabilityCache cache = mScrollCache; 3664 if (cache != null) { 3665 return cache.fadingEdgeLength; 3666 } 3667 } 3668 return 0; 3669 } 3670 3671 /** 3672 * Returns the width of the vertical scrollbar. 3673 * 3674 * @return The width in pixels of the vertical scrollbar or 0 if there 3675 * is no vertical scrollbar. 3676 */ 3677 public int getVerticalScrollbarWidth() { 3678 ScrollabilityCache cache = mScrollCache; 3679 if (cache != null) { 3680 ScrollBarDrawable scrollBar = cache.scrollBar; 3681 if (scrollBar != null) { 3682 int size = scrollBar.getSize(true); 3683 if (size <= 0) { 3684 size = cache.scrollBarSize; 3685 } 3686 return size; 3687 } 3688 return 0; 3689 } 3690 return 0; 3691 } 3692 3693 /** 3694 * Returns the height of the horizontal scrollbar. 3695 * 3696 * @return The height in pixels of the horizontal scrollbar or 0 if 3697 * there is no horizontal scrollbar. 3698 */ 3699 protected int getHorizontalScrollbarHeight() { 3700 ScrollabilityCache cache = mScrollCache; 3701 if (cache != null) { 3702 ScrollBarDrawable scrollBar = cache.scrollBar; 3703 if (scrollBar != null) { 3704 int size = scrollBar.getSize(false); 3705 if (size <= 0) { 3706 size = cache.scrollBarSize; 3707 } 3708 return size; 3709 } 3710 return 0; 3711 } 3712 return 0; 3713 } 3714 3715 /** 3716 * <p> 3717 * Initializes the scrollbars from a given set of styled attributes. This 3718 * method should be called by subclasses that need scrollbars and when an 3719 * instance of these subclasses is created programmatically rather than 3720 * being inflated from XML. This method is automatically called when the XML 3721 * is inflated. 3722 * </p> 3723 * 3724 * @param a the styled attributes set to initialize the scrollbars from 3725 */ 3726 protected void initializeScrollbars(TypedArray a) { 3727 initScrollCache(); 3728 3729 final ScrollabilityCache scrollabilityCache = mScrollCache; 3730 3731 if (scrollabilityCache.scrollBar == null) { 3732 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3733 } 3734 3735 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3736 3737 if (!fadeScrollbars) { 3738 scrollabilityCache.state = ScrollabilityCache.ON; 3739 } 3740 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3741 3742 3743 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3744 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3745 .getScrollBarFadeDuration()); 3746 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3747 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3748 ViewConfiguration.getScrollDefaultDelay()); 3749 3750 3751 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3752 com.android.internal.R.styleable.View_scrollbarSize, 3753 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3754 3755 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3756 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3757 3758 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3759 if (thumb != null) { 3760 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3761 } 3762 3763 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3764 false); 3765 if (alwaysDraw) { 3766 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3767 } 3768 3769 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3770 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3771 3772 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3773 if (thumb != null) { 3774 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3775 } 3776 3777 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3778 false); 3779 if (alwaysDraw) { 3780 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3781 } 3782 3783 // Re-apply user/background padding so that scrollbar(s) get added 3784 resolvePadding(); 3785 } 3786 3787 /** 3788 * <p> 3789 * Initalizes the scrollability cache if necessary. 3790 * </p> 3791 */ 3792 private void initScrollCache() { 3793 if (mScrollCache == null) { 3794 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3795 } 3796 } 3797 3798 private ScrollabilityCache getScrollCache() { 3799 initScrollCache(); 3800 return mScrollCache; 3801 } 3802 3803 /** 3804 * Set the position of the vertical scroll bar. Should be one of 3805 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3806 * {@link #SCROLLBAR_POSITION_RIGHT}. 3807 * 3808 * @param position Where the vertical scroll bar should be positioned. 3809 */ 3810 public void setVerticalScrollbarPosition(int position) { 3811 if (mVerticalScrollbarPosition != position) { 3812 mVerticalScrollbarPosition = position; 3813 computeOpaqueFlags(); 3814 resolvePadding(); 3815 } 3816 } 3817 3818 /** 3819 * @return The position where the vertical scroll bar will show, if applicable. 3820 * @see #setVerticalScrollbarPosition(int) 3821 */ 3822 public int getVerticalScrollbarPosition() { 3823 return mVerticalScrollbarPosition; 3824 } 3825 3826 ListenerInfo getListenerInfo() { 3827 if (mListenerInfo != null) { 3828 return mListenerInfo; 3829 } 3830 mListenerInfo = new ListenerInfo(); 3831 return mListenerInfo; 3832 } 3833 3834 /** 3835 * Register a callback to be invoked when focus of this view changed. 3836 * 3837 * @param l The callback that will run. 3838 */ 3839 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3840 getListenerInfo().mOnFocusChangeListener = l; 3841 } 3842 3843 /** 3844 * Add a listener that will be called when the bounds of the view change due to 3845 * layout processing. 3846 * 3847 * @param listener The listener that will be called when layout bounds change. 3848 */ 3849 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3850 ListenerInfo li = getListenerInfo(); 3851 if (li.mOnLayoutChangeListeners == null) { 3852 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3853 } 3854 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3855 li.mOnLayoutChangeListeners.add(listener); 3856 } 3857 } 3858 3859 /** 3860 * Remove a listener for layout changes. 3861 * 3862 * @param listener The listener for layout bounds change. 3863 */ 3864 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3865 ListenerInfo li = mListenerInfo; 3866 if (li == null || li.mOnLayoutChangeListeners == null) { 3867 return; 3868 } 3869 li.mOnLayoutChangeListeners.remove(listener); 3870 } 3871 3872 /** 3873 * Add a listener for attach state changes. 3874 * 3875 * This listener will be called whenever this view is attached or detached 3876 * from a window. Remove the listener using 3877 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3878 * 3879 * @param listener Listener to attach 3880 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3881 */ 3882 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3883 ListenerInfo li = getListenerInfo(); 3884 if (li.mOnAttachStateChangeListeners == null) { 3885 li.mOnAttachStateChangeListeners 3886 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3887 } 3888 li.mOnAttachStateChangeListeners.add(listener); 3889 } 3890 3891 /** 3892 * Remove a listener for attach state changes. The listener will receive no further 3893 * notification of window attach/detach events. 3894 * 3895 * @param listener Listener to remove 3896 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3897 */ 3898 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3899 ListenerInfo li = mListenerInfo; 3900 if (li == null || li.mOnAttachStateChangeListeners == null) { 3901 return; 3902 } 3903 li.mOnAttachStateChangeListeners.remove(listener); 3904 } 3905 3906 /** 3907 * Returns the focus-change callback registered for this view. 3908 * 3909 * @return The callback, or null if one is not registered. 3910 */ 3911 public OnFocusChangeListener getOnFocusChangeListener() { 3912 ListenerInfo li = mListenerInfo; 3913 return li != null ? li.mOnFocusChangeListener : null; 3914 } 3915 3916 /** 3917 * Register a callback to be invoked when this view is clicked. If this view is not 3918 * clickable, it becomes clickable. 3919 * 3920 * @param l The callback that will run 3921 * 3922 * @see #setClickable(boolean) 3923 */ 3924 public void setOnClickListener(OnClickListener l) { 3925 if (!isClickable()) { 3926 setClickable(true); 3927 } 3928 getListenerInfo().mOnClickListener = l; 3929 } 3930 3931 /** 3932 * Return whether this view has an attached OnClickListener. Returns 3933 * true if there is a listener, false if there is none. 3934 */ 3935 public boolean hasOnClickListeners() { 3936 ListenerInfo li = mListenerInfo; 3937 return (li != null && li.mOnClickListener != null); 3938 } 3939 3940 /** 3941 * Register a callback to be invoked when this view is clicked and held. If this view is not 3942 * long clickable, it becomes long clickable. 3943 * 3944 * @param l The callback that will run 3945 * 3946 * @see #setLongClickable(boolean) 3947 */ 3948 public void setOnLongClickListener(OnLongClickListener l) { 3949 if (!isLongClickable()) { 3950 setLongClickable(true); 3951 } 3952 getListenerInfo().mOnLongClickListener = l; 3953 } 3954 3955 /** 3956 * Register a callback to be invoked when the context menu for this view is 3957 * being built. If this view is not long clickable, it becomes long clickable. 3958 * 3959 * @param l The callback that will run 3960 * 3961 */ 3962 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3963 if (!isLongClickable()) { 3964 setLongClickable(true); 3965 } 3966 getListenerInfo().mOnCreateContextMenuListener = l; 3967 } 3968 3969 /** 3970 * Call this view's OnClickListener, if it is defined. Performs all normal 3971 * actions associated with clicking: reporting accessibility event, playing 3972 * a sound, etc. 3973 * 3974 * @return True there was an assigned OnClickListener that was called, false 3975 * otherwise is returned. 3976 */ 3977 public boolean performClick() { 3978 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3979 3980 ListenerInfo li = mListenerInfo; 3981 if (li != null && li.mOnClickListener != null) { 3982 playSoundEffect(SoundEffectConstants.CLICK); 3983 li.mOnClickListener.onClick(this); 3984 return true; 3985 } 3986 3987 return false; 3988 } 3989 3990 /** 3991 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3992 * this only calls the listener, and does not do any associated clicking 3993 * actions like reporting an accessibility event. 3994 * 3995 * @return True there was an assigned OnClickListener that was called, false 3996 * otherwise is returned. 3997 */ 3998 public boolean callOnClick() { 3999 ListenerInfo li = mListenerInfo; 4000 if (li != null && li.mOnClickListener != null) { 4001 li.mOnClickListener.onClick(this); 4002 return true; 4003 } 4004 return false; 4005 } 4006 4007 /** 4008 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 4009 * OnLongClickListener did not consume the event. 4010 * 4011 * @return True if one of the above receivers consumed the event, false otherwise. 4012 */ 4013 public boolean performLongClick() { 4014 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 4015 4016 boolean handled = false; 4017 ListenerInfo li = mListenerInfo; 4018 if (li != null && li.mOnLongClickListener != null) { 4019 handled = li.mOnLongClickListener.onLongClick(View.this); 4020 } 4021 if (!handled) { 4022 handled = showContextMenu(); 4023 } 4024 if (handled) { 4025 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 4026 } 4027 return handled; 4028 } 4029 4030 /** 4031 * Performs button-related actions during a touch down event. 4032 * 4033 * @param event The event. 4034 * @return True if the down was consumed. 4035 * 4036 * @hide 4037 */ 4038 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 4039 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 4040 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4041 return true; 4042 } 4043 } 4044 return false; 4045 } 4046 4047 /** 4048 * Bring up the context menu for this view. 4049 * 4050 * @return Whether a context menu was displayed. 4051 */ 4052 public boolean showContextMenu() { 4053 return getParent().showContextMenuForChild(this); 4054 } 4055 4056 /** 4057 * Bring up the context menu for this view, referring to the item under the specified point. 4058 * 4059 * @param x The referenced x coordinate. 4060 * @param y The referenced y coordinate. 4061 * @param metaState The keyboard modifiers that were pressed. 4062 * @return Whether a context menu was displayed. 4063 * 4064 * @hide 4065 */ 4066 public boolean showContextMenu(float x, float y, int metaState) { 4067 return showContextMenu(); 4068 } 4069 4070 /** 4071 * Start an action mode. 4072 * 4073 * @param callback Callback that will control the lifecycle of the action mode 4074 * @return The new action mode if it is started, null otherwise 4075 * 4076 * @see ActionMode 4077 */ 4078 public ActionMode startActionMode(ActionMode.Callback callback) { 4079 ViewParent parent = getParent(); 4080 if (parent == null) return null; 4081 return parent.startActionModeForChild(this, callback); 4082 } 4083 4084 /** 4085 * Register a callback to be invoked when a key is pressed in this view. 4086 * @param l the key listener to attach to this view 4087 */ 4088 public void setOnKeyListener(OnKeyListener l) { 4089 getListenerInfo().mOnKeyListener = l; 4090 } 4091 4092 /** 4093 * Register a callback to be invoked when a touch event is sent to this view. 4094 * @param l the touch listener to attach to this view 4095 */ 4096 public void setOnTouchListener(OnTouchListener l) { 4097 getListenerInfo().mOnTouchListener = l; 4098 } 4099 4100 /** 4101 * Register a callback to be invoked when a generic motion event is sent to this view. 4102 * @param l the generic motion listener to attach to this view 4103 */ 4104 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4105 getListenerInfo().mOnGenericMotionListener = l; 4106 } 4107 4108 /** 4109 * Register a callback to be invoked when a hover event is sent to this view. 4110 * @param l the hover listener to attach to this view 4111 */ 4112 public void setOnHoverListener(OnHoverListener l) { 4113 getListenerInfo().mOnHoverListener = l; 4114 } 4115 4116 /** 4117 * Register a drag event listener callback object for this View. The parameter is 4118 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4119 * View, the system calls the 4120 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4121 * @param l An implementation of {@link android.view.View.OnDragListener}. 4122 */ 4123 public void setOnDragListener(OnDragListener l) { 4124 getListenerInfo().mOnDragListener = l; 4125 } 4126 4127 /** 4128 * Give this view focus. This will cause 4129 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4130 * 4131 * Note: this does not check whether this {@link View} should get focus, it just 4132 * gives it focus no matter what. It should only be called internally by framework 4133 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4134 * 4135 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4136 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4137 * focus moved when requestFocus() is called. It may not always 4138 * apply, in which case use the default View.FOCUS_DOWN. 4139 * @param previouslyFocusedRect The rectangle of the view that had focus 4140 * prior in this View's coordinate system. 4141 */ 4142 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4143 if (DBG) { 4144 System.out.println(this + " requestFocus()"); 4145 } 4146 4147 if ((mPrivateFlags & FOCUSED) == 0) { 4148 mPrivateFlags |= FOCUSED; 4149 4150 if (mParent != null) { 4151 mParent.requestChildFocus(this, this); 4152 } 4153 4154 onFocusChanged(true, direction, previouslyFocusedRect); 4155 refreshDrawableState(); 4156 4157 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4158 notifyAccessibilityStateChanged(); 4159 } 4160 } 4161 } 4162 4163 /** 4164 * Request that a rectangle of this view be visible on the screen, 4165 * scrolling if necessary just enough. 4166 * 4167 * <p>A View should call this if it maintains some notion of which part 4168 * of its content is interesting. For example, a text editing view 4169 * should call this when its cursor moves. 4170 * 4171 * @param rectangle The rectangle. 4172 * @return Whether any parent scrolled. 4173 */ 4174 public boolean requestRectangleOnScreen(Rect rectangle) { 4175 return requestRectangleOnScreen(rectangle, false); 4176 } 4177 4178 /** 4179 * Request that a rectangle of this view be visible on the screen, 4180 * scrolling if necessary just enough. 4181 * 4182 * <p>A View should call this if it maintains some notion of which part 4183 * of its content is interesting. For example, a text editing view 4184 * should call this when its cursor moves. 4185 * 4186 * <p>When <code>immediate</code> is set to true, scrolling will not be 4187 * animated. 4188 * 4189 * @param rectangle The rectangle. 4190 * @param immediate True to forbid animated scrolling, false otherwise 4191 * @return Whether any parent scrolled. 4192 */ 4193 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4194 View child = this; 4195 ViewParent parent = mParent; 4196 boolean scrolled = false; 4197 while (parent != null) { 4198 scrolled |= parent.requestChildRectangleOnScreen(child, 4199 rectangle, immediate); 4200 4201 // offset rect so next call has the rectangle in the 4202 // coordinate system of its direct child. 4203 rectangle.offset(child.getLeft(), child.getTop()); 4204 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4205 4206 if (!(parent instanceof View)) { 4207 break; 4208 } 4209 4210 child = (View) parent; 4211 parent = child.getParent(); 4212 } 4213 return scrolled; 4214 } 4215 4216 /** 4217 * Called when this view wants to give up focus. If focus is cleared 4218 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4219 * <p> 4220 * <strong>Note:</strong> When a View clears focus the framework is trying 4221 * to give focus to the first focusable View from the top. Hence, if this 4222 * View is the first from the top that can take focus, then all callbacks 4223 * related to clearing focus will be invoked after wich the framework will 4224 * give focus to this view. 4225 * </p> 4226 */ 4227 public void clearFocus() { 4228 if (DBG) { 4229 System.out.println(this + " clearFocus()"); 4230 } 4231 4232 if ((mPrivateFlags & FOCUSED) != 0) { 4233 mPrivateFlags &= ~FOCUSED; 4234 4235 if (mParent != null) { 4236 mParent.clearChildFocus(this); 4237 } 4238 4239 onFocusChanged(false, 0, null); 4240 4241 refreshDrawableState(); 4242 4243 ensureInputFocusOnFirstFocusable(); 4244 4245 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4246 notifyAccessibilityStateChanged(); 4247 } 4248 } 4249 } 4250 4251 void ensureInputFocusOnFirstFocusable() { 4252 View root = getRootView(); 4253 if (root != null) { 4254 root.requestFocus(); 4255 } 4256 } 4257 4258 /** 4259 * Called internally by the view system when a new view is getting focus. 4260 * This is what clears the old focus. 4261 */ 4262 void unFocus() { 4263 if (DBG) { 4264 System.out.println(this + " unFocus()"); 4265 } 4266 4267 if ((mPrivateFlags & FOCUSED) != 0) { 4268 mPrivateFlags &= ~FOCUSED; 4269 4270 onFocusChanged(false, 0, null); 4271 refreshDrawableState(); 4272 4273 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4274 notifyAccessibilityStateChanged(); 4275 } 4276 } 4277 } 4278 4279 /** 4280 * Returns true if this view has focus iteself, or is the ancestor of the 4281 * view that has focus. 4282 * 4283 * @return True if this view has or contains focus, false otherwise. 4284 */ 4285 @ViewDebug.ExportedProperty(category = "focus") 4286 public boolean hasFocus() { 4287 return (mPrivateFlags & FOCUSED) != 0; 4288 } 4289 4290 /** 4291 * Returns true if this view is focusable or if it contains a reachable View 4292 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4293 * is a View whose parents do not block descendants focus. 4294 * 4295 * Only {@link #VISIBLE} views are considered focusable. 4296 * 4297 * @return True if the view is focusable or if the view contains a focusable 4298 * View, false otherwise. 4299 * 4300 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4301 */ 4302 public boolean hasFocusable() { 4303 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4304 } 4305 4306 /** 4307 * Called by the view system when the focus state of this view changes. 4308 * When the focus change event is caused by directional navigation, direction 4309 * and previouslyFocusedRect provide insight into where the focus is coming from. 4310 * When overriding, be sure to call up through to the super class so that 4311 * the standard focus handling will occur. 4312 * 4313 * @param gainFocus True if the View has focus; false otherwise. 4314 * @param direction The direction focus has moved when requestFocus() 4315 * is called to give this view focus. Values are 4316 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4317 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4318 * It may not always apply, in which case use the default. 4319 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4320 * system, of the previously focused view. If applicable, this will be 4321 * passed in as finer grained information about where the focus is coming 4322 * from (in addition to direction). Will be <code>null</code> otherwise. 4323 */ 4324 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4325 if (gainFocus) { 4326 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4327 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4328 requestAccessibilityFocus(); 4329 } 4330 } 4331 4332 InputMethodManager imm = InputMethodManager.peekInstance(); 4333 if (!gainFocus) { 4334 if (isPressed()) { 4335 setPressed(false); 4336 } 4337 if (imm != null && mAttachInfo != null 4338 && mAttachInfo.mHasWindowFocus) { 4339 imm.focusOut(this); 4340 } 4341 onFocusLost(); 4342 } else if (imm != null && mAttachInfo != null 4343 && mAttachInfo.mHasWindowFocus) { 4344 imm.focusIn(this); 4345 } 4346 4347 invalidate(true); 4348 ListenerInfo li = mListenerInfo; 4349 if (li != null && li.mOnFocusChangeListener != null) { 4350 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4351 } 4352 4353 if (mAttachInfo != null) { 4354 mAttachInfo.mKeyDispatchState.reset(this); 4355 } 4356 } 4357 4358 /** 4359 * Sends an accessibility event of the given type. If accessiiblity is 4360 * not enabled this method has no effect. The default implementation calls 4361 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4362 * to populate information about the event source (this View), then calls 4363 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4364 * populate the text content of the event source including its descendants, 4365 * and last calls 4366 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4367 * on its parent to resuest sending of the event to interested parties. 4368 * <p> 4369 * If an {@link AccessibilityDelegate} has been specified via calling 4370 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4371 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4372 * responsible for handling this call. 4373 * </p> 4374 * 4375 * @param eventType The type of the event to send, as defined by several types from 4376 * {@link android.view.accessibility.AccessibilityEvent}, such as 4377 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4378 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4379 * 4380 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4381 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4382 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4383 * @see AccessibilityDelegate 4384 */ 4385 public void sendAccessibilityEvent(int eventType) { 4386 if (mAccessibilityDelegate != null) { 4387 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4388 } else { 4389 sendAccessibilityEventInternal(eventType); 4390 } 4391 } 4392 4393 /** 4394 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4395 * {@link AccessibilityEvent} to make an announcement which is related to some 4396 * sort of a context change for which none of the events representing UI transitions 4397 * is a good fit. For example, announcing a new page in a book. If accessibility 4398 * is not enabled this method does nothing. 4399 * 4400 * @param text The announcement text. 4401 */ 4402 public void announceForAccessibility(CharSequence text) { 4403 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4404 AccessibilityEvent event = AccessibilityEvent.obtain( 4405 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4406 event.getText().add(text); 4407 sendAccessibilityEventUnchecked(event); 4408 } 4409 } 4410 4411 /** 4412 * @see #sendAccessibilityEvent(int) 4413 * 4414 * Note: Called from the default {@link AccessibilityDelegate}. 4415 */ 4416 void sendAccessibilityEventInternal(int eventType) { 4417 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4418 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4419 } 4420 } 4421 4422 /** 4423 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4424 * takes as an argument an empty {@link AccessibilityEvent} and does not 4425 * perform a check whether accessibility is enabled. 4426 * <p> 4427 * If an {@link AccessibilityDelegate} has been specified via calling 4428 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4429 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4430 * is responsible for handling this call. 4431 * </p> 4432 * 4433 * @param event The event to send. 4434 * 4435 * @see #sendAccessibilityEvent(int) 4436 */ 4437 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4438 if (mAccessibilityDelegate != null) { 4439 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4440 } else { 4441 sendAccessibilityEventUncheckedInternal(event); 4442 } 4443 } 4444 4445 /** 4446 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4447 * 4448 * Note: Called from the default {@link AccessibilityDelegate}. 4449 */ 4450 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4451 if (!isShown()) { 4452 return; 4453 } 4454 onInitializeAccessibilityEvent(event); 4455 // Only a subset of accessibility events populates text content. 4456 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4457 dispatchPopulateAccessibilityEvent(event); 4458 } 4459 // Intercept accessibility focus events fired by virtual nodes to keep 4460 // track of accessibility focus position in such nodes. 4461 final int eventType = event.getEventType(); 4462 switch (eventType) { 4463 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4464 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4465 event.getSourceNodeId()); 4466 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4467 ViewRootImpl viewRootImpl = getViewRootImpl(); 4468 if (viewRootImpl != null) { 4469 viewRootImpl.setAccessibilityFocusedHost(this); 4470 } 4471 } 4472 } break; 4473 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4474 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4475 event.getSourceNodeId()); 4476 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4477 ViewRootImpl viewRootImpl = getViewRootImpl(); 4478 if (viewRootImpl != null) { 4479 viewRootImpl.setAccessibilityFocusedHost(null); 4480 } 4481 } 4482 } break; 4483 } 4484 // In the beginning we called #isShown(), so we know that getParent() is not null. 4485 getParent().requestSendAccessibilityEvent(this, event); 4486 } 4487 4488 /** 4489 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4490 * to its children for adding their text content to the event. Note that the 4491 * event text is populated in a separate dispatch path since we add to the 4492 * event not only the text of the source but also the text of all its descendants. 4493 * A typical implementation will call 4494 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4495 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4496 * on each child. Override this method if custom population of the event text 4497 * content is required. 4498 * <p> 4499 * If an {@link AccessibilityDelegate} has been specified via calling 4500 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4501 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4502 * is responsible for handling this call. 4503 * </p> 4504 * <p> 4505 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4506 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4507 * </p> 4508 * 4509 * @param event The event. 4510 * 4511 * @return True if the event population was completed. 4512 */ 4513 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4514 if (mAccessibilityDelegate != null) { 4515 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4516 } else { 4517 return dispatchPopulateAccessibilityEventInternal(event); 4518 } 4519 } 4520 4521 /** 4522 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4523 * 4524 * Note: Called from the default {@link AccessibilityDelegate}. 4525 */ 4526 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4527 onPopulateAccessibilityEvent(event); 4528 return false; 4529 } 4530 4531 /** 4532 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4533 * giving a chance to this View to populate the accessibility event with its 4534 * text content. While this method is free to modify event 4535 * attributes other than text content, doing so should normally be performed in 4536 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4537 * <p> 4538 * Example: Adding formatted date string to an accessibility event in addition 4539 * to the text added by the super implementation: 4540 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4541 * super.onPopulateAccessibilityEvent(event); 4542 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4543 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4544 * mCurrentDate.getTimeInMillis(), flags); 4545 * event.getText().add(selectedDateUtterance); 4546 * }</pre> 4547 * <p> 4548 * If an {@link AccessibilityDelegate} has been specified via calling 4549 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4550 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4551 * is responsible for handling this call. 4552 * </p> 4553 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4554 * information to the event, in case the default implementation has basic information to add. 4555 * </p> 4556 * 4557 * @param event The accessibility event which to populate. 4558 * 4559 * @see #sendAccessibilityEvent(int) 4560 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4561 */ 4562 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4563 if (mAccessibilityDelegate != null) { 4564 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4565 } else { 4566 onPopulateAccessibilityEventInternal(event); 4567 } 4568 } 4569 4570 /** 4571 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4572 * 4573 * Note: Called from the default {@link AccessibilityDelegate}. 4574 */ 4575 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4576 4577 } 4578 4579 /** 4580 * Initializes an {@link AccessibilityEvent} with information about 4581 * this View which is the event source. In other words, the source of 4582 * an accessibility event is the view whose state change triggered firing 4583 * the event. 4584 * <p> 4585 * Example: Setting the password property of an event in addition 4586 * to properties set by the super implementation: 4587 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4588 * super.onInitializeAccessibilityEvent(event); 4589 * event.setPassword(true); 4590 * }</pre> 4591 * <p> 4592 * If an {@link AccessibilityDelegate} has been specified via calling 4593 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4594 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4595 * is responsible for handling this call. 4596 * </p> 4597 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4598 * information to the event, in case the default implementation has basic information to add. 4599 * </p> 4600 * @param event The event to initialize. 4601 * 4602 * @see #sendAccessibilityEvent(int) 4603 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4604 */ 4605 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4606 if (mAccessibilityDelegate != null) { 4607 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4608 } else { 4609 onInitializeAccessibilityEventInternal(event); 4610 } 4611 } 4612 4613 /** 4614 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4615 * 4616 * Note: Called from the default {@link AccessibilityDelegate}. 4617 */ 4618 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4619 event.setSource(this); 4620 event.setClassName(View.class.getName()); 4621 event.setPackageName(getContext().getPackageName()); 4622 event.setEnabled(isEnabled()); 4623 event.setContentDescription(mContentDescription); 4624 4625 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4626 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4627 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4628 FOCUSABLES_ALL); 4629 event.setItemCount(focusablesTempList.size()); 4630 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4631 focusablesTempList.clear(); 4632 } 4633 } 4634 4635 /** 4636 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4637 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4638 * This method is responsible for obtaining an accessibility node info from a 4639 * pool of reusable instances and calling 4640 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4641 * initialize the former. 4642 * <p> 4643 * Note: The client is responsible for recycling the obtained instance by calling 4644 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4645 * </p> 4646 * 4647 * @return A populated {@link AccessibilityNodeInfo}. 4648 * 4649 * @see AccessibilityNodeInfo 4650 */ 4651 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4652 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4653 if (provider != null) { 4654 return provider.createAccessibilityNodeInfo(View.NO_ID); 4655 } else { 4656 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4657 onInitializeAccessibilityNodeInfo(info); 4658 return info; 4659 } 4660 } 4661 4662 /** 4663 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4664 * The base implementation sets: 4665 * <ul> 4666 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4667 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4668 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4669 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4670 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4671 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4672 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4673 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4674 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4675 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4676 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4677 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4678 * </ul> 4679 * <p> 4680 * Subclasses should override this method, call the super implementation, 4681 * and set additional attributes. 4682 * </p> 4683 * <p> 4684 * If an {@link AccessibilityDelegate} has been specified via calling 4685 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4686 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4687 * is responsible for handling this call. 4688 * </p> 4689 * 4690 * @param info The instance to initialize. 4691 */ 4692 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4693 if (mAccessibilityDelegate != null) { 4694 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4695 } else { 4696 onInitializeAccessibilityNodeInfoInternal(info); 4697 } 4698 } 4699 4700 /** 4701 * Gets the location of this view in screen coordintates. 4702 * 4703 * @param outRect The output location 4704 */ 4705 private void getBoundsOnScreen(Rect outRect) { 4706 if (mAttachInfo == null) { 4707 return; 4708 } 4709 4710 RectF position = mAttachInfo.mTmpTransformRect; 4711 position.set(0, 0, mRight - mLeft, mBottom - mTop); 4712 4713 if (!hasIdentityMatrix()) { 4714 getMatrix().mapRect(position); 4715 } 4716 4717 position.offset(mLeft, mTop); 4718 4719 ViewParent parent = mParent; 4720 while (parent instanceof View) { 4721 View parentView = (View) parent; 4722 4723 position.offset(-parentView.mScrollX, -parentView.mScrollY); 4724 4725 if (!parentView.hasIdentityMatrix()) { 4726 parentView.getMatrix().mapRect(position); 4727 } 4728 4729 position.offset(parentView.mLeft, parentView.mTop); 4730 4731 parent = parentView.mParent; 4732 } 4733 4734 if (parent instanceof ViewRootImpl) { 4735 ViewRootImpl viewRootImpl = (ViewRootImpl) parent; 4736 position.offset(0, -viewRootImpl.mCurScrollY); 4737 } 4738 4739 position.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4740 4741 outRect.set((int) (position.left + 0.5f), (int) (position.top + 0.5f), 4742 (int) (position.right + 0.5f), (int) (position.bottom + 0.5f)); 4743 } 4744 4745 /** 4746 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4747 * 4748 * Note: Called from the default {@link AccessibilityDelegate}. 4749 */ 4750 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4751 Rect bounds = mAttachInfo.mTmpInvalRect; 4752 getDrawingRect(bounds); 4753 info.setBoundsInParent(bounds); 4754 4755 getBoundsOnScreen(bounds); 4756 info.setBoundsInScreen(bounds); 4757 4758 ViewParent parent = getParentForAccessibility(); 4759 if (parent instanceof View) { 4760 info.setParent((View) parent); 4761 } 4762 4763 info.setVisibleToUser(isVisibleToUser()); 4764 4765 info.setPackageName(mContext.getPackageName()); 4766 info.setClassName(View.class.getName()); 4767 info.setContentDescription(getContentDescription()); 4768 4769 info.setEnabled(isEnabled()); 4770 info.setClickable(isClickable()); 4771 info.setFocusable(isFocusable()); 4772 info.setFocused(isFocused()); 4773 info.setAccessibilityFocused(isAccessibilityFocused()); 4774 info.setSelected(isSelected()); 4775 info.setLongClickable(isLongClickable()); 4776 4777 // TODO: These make sense only if we are in an AdapterView but all 4778 // views can be selected. Maybe from accessiiblity perspective 4779 // we should report as selectable view in an AdapterView. 4780 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4781 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4782 4783 if (isFocusable()) { 4784 if (isFocused()) { 4785 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4786 } else { 4787 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4788 } 4789 } 4790 4791 if (!isAccessibilityFocused()) { 4792 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4793 } else { 4794 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4795 } 4796 4797 if (isClickable() && isEnabled()) { 4798 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4799 } 4800 4801 if (isLongClickable() && isEnabled()) { 4802 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4803 } 4804 4805 if (mContentDescription != null && mContentDescription.length() > 0) { 4806 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY); 4807 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY); 4808 info.setMovementGranularities(AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER 4809 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD 4810 | AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH); 4811 } 4812 } 4813 4814 /** 4815 * Computes whether this view is visible to the user. Such a view is 4816 * attached, visible, all its predecessors are visible, it is not clipped 4817 * entirely by its predecessors, and has an alpha greater than zero. 4818 * 4819 * @return Whether the view is visible on the screen. 4820 * 4821 * @hide 4822 */ 4823 protected boolean isVisibleToUser() { 4824 return isVisibleToUser(null); 4825 } 4826 4827 /** 4828 * Computes whether the given portion of this view is visible to the user. Such a view is 4829 * attached, visible, all its predecessors are visible, has an alpha greater than zero, and 4830 * the specified portion is not clipped entirely by its predecessors. 4831 * 4832 * @param boundInView the portion of the view to test; coordinates should be relative; may be 4833 * <code>null</code>, and the entire view will be tested in this case. 4834 * When <code>true</code> is returned by the function, the actual visible 4835 * region will be stored in this parameter; that is, if boundInView is fully 4836 * contained within the view, no modification will be made, otherwise regions 4837 * outside of the visible area of the view will be clipped. 4838 * 4839 * @return Whether the specified portion of the view is visible on the screen. 4840 * 4841 * @hide 4842 */ 4843 protected boolean isVisibleToUser(Rect boundInView) { 4844 Rect visibleRect = mAttachInfo.mTmpInvalRect; 4845 Point offset = mAttachInfo.mPoint; 4846 // The first two checks are made also made by isShown() which 4847 // however traverses the tree up to the parent to catch that. 4848 // Therefore, we do some fail fast check to minimize the up 4849 // tree traversal. 4850 boolean isVisible = mAttachInfo != null 4851 && mAttachInfo.mWindowVisibility == View.VISIBLE 4852 && getAlpha() > 0 4853 && isShown() 4854 && getGlobalVisibleRect(visibleRect, offset); 4855 if (isVisible && boundInView != null) { 4856 visibleRect.offset(-offset.x, -offset.y); 4857 isVisible &= boundInView.intersect(visibleRect); 4858 } 4859 return isVisible; 4860 } 4861 4862 /** 4863 * Sets a delegate for implementing accessibility support via compositon as 4864 * opposed to inheritance. The delegate's primary use is for implementing 4865 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4866 * 4867 * @param delegate The delegate instance. 4868 * 4869 * @see AccessibilityDelegate 4870 */ 4871 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4872 mAccessibilityDelegate = delegate; 4873 } 4874 4875 /** 4876 * Gets the provider for managing a virtual view hierarchy rooted at this View 4877 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4878 * that explore the window content. 4879 * <p> 4880 * If this method returns an instance, this instance is responsible for managing 4881 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4882 * View including the one representing the View itself. Similarly the returned 4883 * instance is responsible for performing accessibility actions on any virtual 4884 * view or the root view itself. 4885 * </p> 4886 * <p> 4887 * If an {@link AccessibilityDelegate} has been specified via calling 4888 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4889 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4890 * is responsible for handling this call. 4891 * </p> 4892 * 4893 * @return The provider. 4894 * 4895 * @see AccessibilityNodeProvider 4896 */ 4897 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4898 if (mAccessibilityDelegate != null) { 4899 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4900 } else { 4901 return null; 4902 } 4903 } 4904 4905 /** 4906 * Gets the unique identifier of this view on the screen for accessibility purposes. 4907 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4908 * 4909 * @return The view accessibility id. 4910 * 4911 * @hide 4912 */ 4913 public int getAccessibilityViewId() { 4914 if (mAccessibilityViewId == NO_ID) { 4915 mAccessibilityViewId = sNextAccessibilityViewId++; 4916 } 4917 return mAccessibilityViewId; 4918 } 4919 4920 /** 4921 * Gets the unique identifier of the window in which this View reseides. 4922 * 4923 * @return The window accessibility id. 4924 * 4925 * @hide 4926 */ 4927 public int getAccessibilityWindowId() { 4928 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4929 } 4930 4931 /** 4932 * Gets the {@link View} description. It briefly describes the view and is 4933 * primarily used for accessibility support. Set this property to enable 4934 * better accessibility support for your application. This is especially 4935 * true for views that do not have textual representation (For example, 4936 * ImageButton). 4937 * 4938 * @return The content description. 4939 * 4940 * @attr ref android.R.styleable#View_contentDescription 4941 */ 4942 @ViewDebug.ExportedProperty(category = "accessibility") 4943 public CharSequence getContentDescription() { 4944 return mContentDescription; 4945 } 4946 4947 /** 4948 * Sets the {@link View} description. It briefly describes the view and is 4949 * primarily used for accessibility support. Set this property to enable 4950 * better accessibility support for your application. This is especially 4951 * true for views that do not have textual representation (For example, 4952 * ImageButton). 4953 * 4954 * @param contentDescription The content description. 4955 * 4956 * @attr ref android.R.styleable#View_contentDescription 4957 */ 4958 @RemotableViewMethod 4959 public void setContentDescription(CharSequence contentDescription) { 4960 mContentDescription = contentDescription; 4961 } 4962 4963 /** 4964 * Invoked whenever this view loses focus, either by losing window focus or by losing 4965 * focus within its window. This method can be used to clear any state tied to the 4966 * focus. For instance, if a button is held pressed with the trackball and the window 4967 * loses focus, this method can be used to cancel the press. 4968 * 4969 * Subclasses of View overriding this method should always call super.onFocusLost(). 4970 * 4971 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4972 * @see #onWindowFocusChanged(boolean) 4973 * 4974 * @hide pending API council approval 4975 */ 4976 protected void onFocusLost() { 4977 resetPressedState(); 4978 } 4979 4980 private void resetPressedState() { 4981 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4982 return; 4983 } 4984 4985 if (isPressed()) { 4986 setPressed(false); 4987 4988 if (!mHasPerformedLongPress) { 4989 removeLongPressCallback(); 4990 } 4991 } 4992 } 4993 4994 /** 4995 * Returns true if this view has focus 4996 * 4997 * @return True if this view has focus, false otherwise. 4998 */ 4999 @ViewDebug.ExportedProperty(category = "focus") 5000 public boolean isFocused() { 5001 return (mPrivateFlags & FOCUSED) != 0; 5002 } 5003 5004 /** 5005 * Find the view in the hierarchy rooted at this view that currently has 5006 * focus. 5007 * 5008 * @return The view that currently has focus, or null if no focused view can 5009 * be found. 5010 */ 5011 public View findFocus() { 5012 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 5013 } 5014 5015 /** 5016 * Indicates whether this view is one of the set of scrollable containers in 5017 * its window. 5018 * 5019 * @return whether this view is one of the set of scrollable containers in 5020 * its window 5021 * 5022 * @attr ref android.R.styleable#View_isScrollContainer 5023 */ 5024 public boolean isScrollContainer() { 5025 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 5026 } 5027 5028 /** 5029 * Change whether this view is one of the set of scrollable containers in 5030 * its window. This will be used to determine whether the window can 5031 * resize or must pan when a soft input area is open -- scrollable 5032 * containers allow the window to use resize mode since the container 5033 * will appropriately shrink. 5034 * 5035 * @attr ref android.R.styleable#View_isScrollContainer 5036 */ 5037 public void setScrollContainer(boolean isScrollContainer) { 5038 if (isScrollContainer) { 5039 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 5040 mAttachInfo.mScrollContainers.add(this); 5041 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 5042 } 5043 mPrivateFlags |= SCROLL_CONTAINER; 5044 } else { 5045 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 5046 mAttachInfo.mScrollContainers.remove(this); 5047 } 5048 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 5049 } 5050 } 5051 5052 /** 5053 * Returns the quality of the drawing cache. 5054 * 5055 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5056 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5057 * 5058 * @see #setDrawingCacheQuality(int) 5059 * @see #setDrawingCacheEnabled(boolean) 5060 * @see #isDrawingCacheEnabled() 5061 * 5062 * @attr ref android.R.styleable#View_drawingCacheQuality 5063 */ 5064 public int getDrawingCacheQuality() { 5065 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 5066 } 5067 5068 /** 5069 * Set the drawing cache quality of this view. This value is used only when the 5070 * drawing cache is enabled 5071 * 5072 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 5073 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 5074 * 5075 * @see #getDrawingCacheQuality() 5076 * @see #setDrawingCacheEnabled(boolean) 5077 * @see #isDrawingCacheEnabled() 5078 * 5079 * @attr ref android.R.styleable#View_drawingCacheQuality 5080 */ 5081 public void setDrawingCacheQuality(int quality) { 5082 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 5083 } 5084 5085 /** 5086 * Returns whether the screen should remain on, corresponding to the current 5087 * value of {@link #KEEP_SCREEN_ON}. 5088 * 5089 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 5090 * 5091 * @see #setKeepScreenOn(boolean) 5092 * 5093 * @attr ref android.R.styleable#View_keepScreenOn 5094 */ 5095 public boolean getKeepScreenOn() { 5096 return (mViewFlags & KEEP_SCREEN_ON) != 0; 5097 } 5098 5099 /** 5100 * Controls whether the screen should remain on, modifying the 5101 * value of {@link #KEEP_SCREEN_ON}. 5102 * 5103 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 5104 * 5105 * @see #getKeepScreenOn() 5106 * 5107 * @attr ref android.R.styleable#View_keepScreenOn 5108 */ 5109 public void setKeepScreenOn(boolean keepScreenOn) { 5110 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 5111 } 5112 5113 /** 5114 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5115 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5116 * 5117 * @attr ref android.R.styleable#View_nextFocusLeft 5118 */ 5119 public int getNextFocusLeftId() { 5120 return mNextFocusLeftId; 5121 } 5122 5123 /** 5124 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5125 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5126 * decide automatically. 5127 * 5128 * @attr ref android.R.styleable#View_nextFocusLeft 5129 */ 5130 public void setNextFocusLeftId(int nextFocusLeftId) { 5131 mNextFocusLeftId = nextFocusLeftId; 5132 } 5133 5134 /** 5135 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5136 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5137 * 5138 * @attr ref android.R.styleable#View_nextFocusRight 5139 */ 5140 public int getNextFocusRightId() { 5141 return mNextFocusRightId; 5142 } 5143 5144 /** 5145 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5146 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5147 * decide automatically. 5148 * 5149 * @attr ref android.R.styleable#View_nextFocusRight 5150 */ 5151 public void setNextFocusRightId(int nextFocusRightId) { 5152 mNextFocusRightId = nextFocusRightId; 5153 } 5154 5155 /** 5156 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5157 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5158 * 5159 * @attr ref android.R.styleable#View_nextFocusUp 5160 */ 5161 public int getNextFocusUpId() { 5162 return mNextFocusUpId; 5163 } 5164 5165 /** 5166 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5167 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5168 * decide automatically. 5169 * 5170 * @attr ref android.R.styleable#View_nextFocusUp 5171 */ 5172 public void setNextFocusUpId(int nextFocusUpId) { 5173 mNextFocusUpId = nextFocusUpId; 5174 } 5175 5176 /** 5177 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5178 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5179 * 5180 * @attr ref android.R.styleable#View_nextFocusDown 5181 */ 5182 public int getNextFocusDownId() { 5183 return mNextFocusDownId; 5184 } 5185 5186 /** 5187 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5188 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5189 * decide automatically. 5190 * 5191 * @attr ref android.R.styleable#View_nextFocusDown 5192 */ 5193 public void setNextFocusDownId(int nextFocusDownId) { 5194 mNextFocusDownId = nextFocusDownId; 5195 } 5196 5197 /** 5198 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5199 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5200 * 5201 * @attr ref android.R.styleable#View_nextFocusForward 5202 */ 5203 public int getNextFocusForwardId() { 5204 return mNextFocusForwardId; 5205 } 5206 5207 /** 5208 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5209 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5210 * decide automatically. 5211 * 5212 * @attr ref android.R.styleable#View_nextFocusForward 5213 */ 5214 public void setNextFocusForwardId(int nextFocusForwardId) { 5215 mNextFocusForwardId = nextFocusForwardId; 5216 } 5217 5218 /** 5219 * Returns the visibility of this view and all of its ancestors 5220 * 5221 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5222 */ 5223 public boolean isShown() { 5224 View current = this; 5225 //noinspection ConstantConditions 5226 do { 5227 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5228 return false; 5229 } 5230 ViewParent parent = current.mParent; 5231 if (parent == null) { 5232 return false; // We are not attached to the view root 5233 } 5234 if (!(parent instanceof View)) { 5235 return true; 5236 } 5237 current = (View) parent; 5238 } while (current != null); 5239 5240 return false; 5241 } 5242 5243 /** 5244 * Called by the view hierarchy when the content insets for a window have 5245 * changed, to allow it to adjust its content to fit within those windows. 5246 * The content insets tell you the space that the status bar, input method, 5247 * and other system windows infringe on the application's window. 5248 * 5249 * <p>You do not normally need to deal with this function, since the default 5250 * window decoration given to applications takes care of applying it to the 5251 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5252 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5253 * and your content can be placed under those system elements. You can then 5254 * use this method within your view hierarchy if you have parts of your UI 5255 * which you would like to ensure are not being covered. 5256 * 5257 * <p>The default implementation of this method simply applies the content 5258 * inset's to the view's padding, consuming that content (modifying the 5259 * insets to be 0), and returning true. This behavior is off by default, but can 5260 * be enabled through {@link #setFitsSystemWindows(boolean)}. 5261 * 5262 * <p>This function's traversal down the hierarchy is depth-first. The same content 5263 * insets object is propagated down the hierarchy, so any changes made to it will 5264 * be seen by all following views (including potentially ones above in 5265 * the hierarchy since this is a depth-first traversal). The first view 5266 * that returns true will abort the entire traversal. 5267 * 5268 * <p>The default implementation works well for a situation where it is 5269 * used with a container that covers the entire window, allowing it to 5270 * apply the appropriate insets to its content on all edges. If you need 5271 * a more complicated layout (such as two different views fitting system 5272 * windows, one on the top of the window, and one on the bottom), 5273 * you can override the method and handle the insets however you would like. 5274 * Note that the insets provided by the framework are always relative to the 5275 * far edges of the window, not accounting for the location of the called view 5276 * within that window. (In fact when this method is called you do not yet know 5277 * where the layout will place the view, as it is done before layout happens.) 5278 * 5279 * <p>Note: unlike many View methods, there is no dispatch phase to this 5280 * call. If you are overriding it in a ViewGroup and want to allow the 5281 * call to continue to your children, you must be sure to call the super 5282 * implementation. 5283 * 5284 * <p>Here is a sample layout that makes use of fitting system windows 5285 * to have controls for a video view placed inside of the window decorations 5286 * that it hides and shows. This can be used with code like the second 5287 * sample (video player) shown in {@link #setSystemUiVisibility(int)}. 5288 * 5289 * {@sample development/samples/ApiDemos/res/layout/video_player.xml complete} 5290 * 5291 * @param insets Current content insets of the window. Prior to 5292 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5293 * the insets or else you and Android will be unhappy. 5294 * 5295 * @return Return true if this view applied the insets and it should not 5296 * continue propagating further down the hierarchy, false otherwise. 5297 * @see #getFitsSystemWindows() 5298 * @see #setFitsSystemWindows() 5299 * @see #setSystemUiVisibility(int) 5300 */ 5301 protected boolean fitSystemWindows(Rect insets) { 5302 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5303 mUserPaddingStart = -1; 5304 mUserPaddingEnd = -1; 5305 mUserPaddingRelative = false; 5306 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5307 || mAttachInfo == null 5308 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5309 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5310 return true; 5311 } else { 5312 internalSetPadding(0, 0, 0, 0); 5313 return false; 5314 } 5315 } 5316 return false; 5317 } 5318 5319 /** 5320 * Sets whether or not this view should account for system screen decorations 5321 * such as the status bar and inset its content; that is, controlling whether 5322 * the default implementation of {@link #fitSystemWindows(Rect)} will be 5323 * executed. See that method for more details. 5324 * 5325 * <p>Note that if you are providing your own implementation of 5326 * {@link #fitSystemWindows(Rect)}, then there is no need to set this 5327 * flag to true -- your implementation will be overriding the default 5328 * implementation that checks this flag. 5329 * 5330 * @param fitSystemWindows If true, then the default implementation of 5331 * {@link #fitSystemWindows(Rect)} will be executed. 5332 * 5333 * @attr ref android.R.styleable#View_fitsSystemWindows 5334 * @see #getFitsSystemWindows() 5335 * @see #fitSystemWindows(Rect) 5336 * @see #setSystemUiVisibility(int) 5337 */ 5338 public void setFitsSystemWindows(boolean fitSystemWindows) { 5339 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5340 } 5341 5342 /** 5343 * Check for state of {@link #setFitsSystemWindows(boolean). If this method 5344 * returns true, the default implementation of {@link #fitSystemWindows(Rect)} 5345 * will be executed. 5346 * 5347 * @return Returns true if the default implementation of 5348 * {@link #fitSystemWindows(Rect)} will be executed. 5349 * 5350 * @attr ref android.R.styleable#View_fitsSystemWindows 5351 * @see #setFitsSystemWindows() 5352 * @see #fitSystemWindows(Rect) 5353 * @see #setSystemUiVisibility(int) 5354 */ 5355 public boolean getFitsSystemWindows() { 5356 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5357 } 5358 5359 /** @hide */ 5360 public boolean fitsSystemWindows() { 5361 return getFitsSystemWindows(); 5362 } 5363 5364 /** 5365 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5366 */ 5367 public void requestFitSystemWindows() { 5368 if (mParent != null) { 5369 mParent.requestFitSystemWindows(); 5370 } 5371 } 5372 5373 /** 5374 * For use by PhoneWindow to make its own system window fitting optional. 5375 * @hide 5376 */ 5377 public void makeOptionalFitsSystemWindows() { 5378 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5379 } 5380 5381 /** 5382 * Returns the visibility status for this view. 5383 * 5384 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5385 * @attr ref android.R.styleable#View_visibility 5386 */ 5387 @ViewDebug.ExportedProperty(mapping = { 5388 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5389 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5390 @ViewDebug.IntToString(from = GONE, to = "GONE") 5391 }) 5392 public int getVisibility() { 5393 return mViewFlags & VISIBILITY_MASK; 5394 } 5395 5396 /** 5397 * Set the enabled state of this view. 5398 * 5399 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5400 * @attr ref android.R.styleable#View_visibility 5401 */ 5402 @RemotableViewMethod 5403 public void setVisibility(int visibility) { 5404 setFlags(visibility, VISIBILITY_MASK); 5405 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5406 } 5407 5408 /** 5409 * Returns the enabled status for this view. The interpretation of the 5410 * enabled state varies by subclass. 5411 * 5412 * @return True if this view is enabled, false otherwise. 5413 */ 5414 @ViewDebug.ExportedProperty 5415 public boolean isEnabled() { 5416 return (mViewFlags & ENABLED_MASK) == ENABLED; 5417 } 5418 5419 /** 5420 * Set the enabled state of this view. The interpretation of the enabled 5421 * state varies by subclass. 5422 * 5423 * @param enabled True if this view is enabled, false otherwise. 5424 */ 5425 @RemotableViewMethod 5426 public void setEnabled(boolean enabled) { 5427 if (enabled == isEnabled()) return; 5428 5429 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5430 5431 /* 5432 * The View most likely has to change its appearance, so refresh 5433 * the drawable state. 5434 */ 5435 refreshDrawableState(); 5436 5437 // Invalidate too, since the default behavior for views is to be 5438 // be drawn at 50% alpha rather than to change the drawable. 5439 invalidate(true); 5440 } 5441 5442 /** 5443 * Set whether this view can receive the focus. 5444 * 5445 * Setting this to false will also ensure that this view is not focusable 5446 * in touch mode. 5447 * 5448 * @param focusable If true, this view can receive the focus. 5449 * 5450 * @see #setFocusableInTouchMode(boolean) 5451 * @attr ref android.R.styleable#View_focusable 5452 */ 5453 public void setFocusable(boolean focusable) { 5454 if (!focusable) { 5455 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5456 } 5457 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5458 } 5459 5460 /** 5461 * Set whether this view can receive focus while in touch mode. 5462 * 5463 * Setting this to true will also ensure that this view is focusable. 5464 * 5465 * @param focusableInTouchMode If true, this view can receive the focus while 5466 * in touch mode. 5467 * 5468 * @see #setFocusable(boolean) 5469 * @attr ref android.R.styleable#View_focusableInTouchMode 5470 */ 5471 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5472 // Focusable in touch mode should always be set before the focusable flag 5473 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5474 // which, in touch mode, will not successfully request focus on this view 5475 // because the focusable in touch mode flag is not set 5476 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5477 if (focusableInTouchMode) { 5478 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5479 } 5480 } 5481 5482 /** 5483 * Set whether this view should have sound effects enabled for events such as 5484 * clicking and touching. 5485 * 5486 * <p>You may wish to disable sound effects for a view if you already play sounds, 5487 * for instance, a dial key that plays dtmf tones. 5488 * 5489 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5490 * @see #isSoundEffectsEnabled() 5491 * @see #playSoundEffect(int) 5492 * @attr ref android.R.styleable#View_soundEffectsEnabled 5493 */ 5494 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5495 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5496 } 5497 5498 /** 5499 * @return whether this view should have sound effects enabled for events such as 5500 * clicking and touching. 5501 * 5502 * @see #setSoundEffectsEnabled(boolean) 5503 * @see #playSoundEffect(int) 5504 * @attr ref android.R.styleable#View_soundEffectsEnabled 5505 */ 5506 @ViewDebug.ExportedProperty 5507 public boolean isSoundEffectsEnabled() { 5508 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5509 } 5510 5511 /** 5512 * Set whether this view should have haptic feedback for events such as 5513 * long presses. 5514 * 5515 * <p>You may wish to disable haptic feedback if your view already controls 5516 * its own haptic feedback. 5517 * 5518 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5519 * @see #isHapticFeedbackEnabled() 5520 * @see #performHapticFeedback(int) 5521 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5522 */ 5523 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5524 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5525 } 5526 5527 /** 5528 * @return whether this view should have haptic feedback enabled for events 5529 * long presses. 5530 * 5531 * @see #setHapticFeedbackEnabled(boolean) 5532 * @see #performHapticFeedback(int) 5533 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5534 */ 5535 @ViewDebug.ExportedProperty 5536 public boolean isHapticFeedbackEnabled() { 5537 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5538 } 5539 5540 /** 5541 * Returns the layout direction for this view. 5542 * 5543 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5544 * {@link #LAYOUT_DIRECTION_RTL}, 5545 * {@link #LAYOUT_DIRECTION_INHERIT} or 5546 * {@link #LAYOUT_DIRECTION_LOCALE}. 5547 * 5548 * @attr ref android.R.styleable#View_layoutDirection 5549 * @hide 5550 */ 5551 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5552 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5553 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5554 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5555 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5556 }) 5557 public int getLayoutDirection() { 5558 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5559 } 5560 5561 /** 5562 * Set the layout direction for this view. This will propagate a reset of layout direction 5563 * resolution to the view's children and resolve layout direction for this view. 5564 * 5565 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5566 * {@link #LAYOUT_DIRECTION_RTL}, 5567 * {@link #LAYOUT_DIRECTION_INHERIT} or 5568 * {@link #LAYOUT_DIRECTION_LOCALE}. 5569 * 5570 * @attr ref android.R.styleable#View_layoutDirection 5571 * @hide 5572 */ 5573 @RemotableViewMethod 5574 public void setLayoutDirection(int layoutDirection) { 5575 if (getLayoutDirection() != layoutDirection) { 5576 // Reset the current layout direction and the resolved one 5577 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5578 resetResolvedLayoutDirection(); 5579 // Set the new layout direction (filtered) and ask for a layout pass 5580 mPrivateFlags2 |= 5581 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5582 requestLayout(); 5583 } 5584 } 5585 5586 /** 5587 * Returns the resolved layout direction for this view. 5588 * 5589 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5590 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5591 * @hide 5592 */ 5593 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5594 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5595 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5596 }) 5597 public int getResolvedLayoutDirection() { 5598 // The layout diretion will be resolved only if needed 5599 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5600 resolveLayoutDirection(); 5601 } 5602 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5603 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5604 } 5605 5606 /** 5607 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5608 * layout attribute and/or the inherited value from the parent 5609 * 5610 * @return true if the layout is right-to-left. 5611 * @hide 5612 */ 5613 @ViewDebug.ExportedProperty(category = "layout") 5614 public boolean isLayoutRtl() { 5615 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5616 } 5617 5618 /** 5619 * Indicates whether the view is currently tracking transient state that the 5620 * app should not need to concern itself with saving and restoring, but that 5621 * the framework should take special note to preserve when possible. 5622 * 5623 * <p>A view with transient state cannot be trivially rebound from an external 5624 * data source, such as an adapter binding item views in a list. This may be 5625 * because the view is performing an animation, tracking user selection 5626 * of content, or similar.</p> 5627 * 5628 * @return true if the view has transient state 5629 */ 5630 @ViewDebug.ExportedProperty(category = "layout") 5631 public boolean hasTransientState() { 5632 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5633 } 5634 5635 /** 5636 * Set whether this view is currently tracking transient state that the 5637 * framework should attempt to preserve when possible. This flag is reference counted, 5638 * so every call to setHasTransientState(true) should be paired with a later call 5639 * to setHasTransientState(false). 5640 * 5641 * <p>A view with transient state cannot be trivially rebound from an external 5642 * data source, such as an adapter binding item views in a list. This may be 5643 * because the view is performing an animation, tracking user selection 5644 * of content, or similar.</p> 5645 * 5646 * @param hasTransientState true if this view has transient state 5647 */ 5648 public void setHasTransientState(boolean hasTransientState) { 5649 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5650 mTransientStateCount - 1; 5651 if (mTransientStateCount < 0) { 5652 mTransientStateCount = 0; 5653 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5654 "unmatched pair of setHasTransientState calls"); 5655 } 5656 if ((hasTransientState && mTransientStateCount == 1) || 5657 (!hasTransientState && mTransientStateCount == 0)) { 5658 // update flag if we've just incremented up from 0 or decremented down to 0 5659 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5660 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5661 if (mParent != null) { 5662 try { 5663 mParent.childHasTransientStateChanged(this, hasTransientState); 5664 } catch (AbstractMethodError e) { 5665 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5666 " does not fully implement ViewParent", e); 5667 } 5668 } 5669 } 5670 } 5671 5672 /** 5673 * If this view doesn't do any drawing on its own, set this flag to 5674 * allow further optimizations. By default, this flag is not set on 5675 * View, but could be set on some View subclasses such as ViewGroup. 5676 * 5677 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5678 * you should clear this flag. 5679 * 5680 * @param willNotDraw whether or not this View draw on its own 5681 */ 5682 public void setWillNotDraw(boolean willNotDraw) { 5683 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5684 } 5685 5686 /** 5687 * Returns whether or not this View draws on its own. 5688 * 5689 * @return true if this view has nothing to draw, false otherwise 5690 */ 5691 @ViewDebug.ExportedProperty(category = "drawing") 5692 public boolean willNotDraw() { 5693 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5694 } 5695 5696 /** 5697 * When a View's drawing cache is enabled, drawing is redirected to an 5698 * offscreen bitmap. Some views, like an ImageView, must be able to 5699 * bypass this mechanism if they already draw a single bitmap, to avoid 5700 * unnecessary usage of the memory. 5701 * 5702 * @param willNotCacheDrawing true if this view does not cache its 5703 * drawing, false otherwise 5704 */ 5705 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5706 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5707 } 5708 5709 /** 5710 * Returns whether or not this View can cache its drawing or not. 5711 * 5712 * @return true if this view does not cache its drawing, false otherwise 5713 */ 5714 @ViewDebug.ExportedProperty(category = "drawing") 5715 public boolean willNotCacheDrawing() { 5716 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5717 } 5718 5719 /** 5720 * Indicates whether this view reacts to click events or not. 5721 * 5722 * @return true if the view is clickable, false otherwise 5723 * 5724 * @see #setClickable(boolean) 5725 * @attr ref android.R.styleable#View_clickable 5726 */ 5727 @ViewDebug.ExportedProperty 5728 public boolean isClickable() { 5729 return (mViewFlags & CLICKABLE) == CLICKABLE; 5730 } 5731 5732 /** 5733 * Enables or disables click events for this view. When a view 5734 * is clickable it will change its state to "pressed" on every click. 5735 * Subclasses should set the view clickable to visually react to 5736 * user's clicks. 5737 * 5738 * @param clickable true to make the view clickable, false otherwise 5739 * 5740 * @see #isClickable() 5741 * @attr ref android.R.styleable#View_clickable 5742 */ 5743 public void setClickable(boolean clickable) { 5744 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5745 } 5746 5747 /** 5748 * Indicates whether this view reacts to long click events or not. 5749 * 5750 * @return true if the view is long clickable, false otherwise 5751 * 5752 * @see #setLongClickable(boolean) 5753 * @attr ref android.R.styleable#View_longClickable 5754 */ 5755 public boolean isLongClickable() { 5756 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5757 } 5758 5759 /** 5760 * Enables or disables long click events for this view. When a view is long 5761 * clickable it reacts to the user holding down the button for a longer 5762 * duration than a tap. This event can either launch the listener or a 5763 * context menu. 5764 * 5765 * @param longClickable true to make the view long clickable, false otherwise 5766 * @see #isLongClickable() 5767 * @attr ref android.R.styleable#View_longClickable 5768 */ 5769 public void setLongClickable(boolean longClickable) { 5770 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5771 } 5772 5773 /** 5774 * Sets the pressed state for this view. 5775 * 5776 * @see #isClickable() 5777 * @see #setClickable(boolean) 5778 * 5779 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5780 * the View's internal state from a previously set "pressed" state. 5781 */ 5782 public void setPressed(boolean pressed) { 5783 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5784 5785 if (pressed) { 5786 mPrivateFlags |= PRESSED; 5787 } else { 5788 mPrivateFlags &= ~PRESSED; 5789 } 5790 5791 if (needsRefresh) { 5792 refreshDrawableState(); 5793 } 5794 dispatchSetPressed(pressed); 5795 } 5796 5797 /** 5798 * Dispatch setPressed to all of this View's children. 5799 * 5800 * @see #setPressed(boolean) 5801 * 5802 * @param pressed The new pressed state 5803 */ 5804 protected void dispatchSetPressed(boolean pressed) { 5805 } 5806 5807 /** 5808 * Indicates whether the view is currently in pressed state. Unless 5809 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5810 * the pressed state. 5811 * 5812 * @see #setPressed(boolean) 5813 * @see #isClickable() 5814 * @see #setClickable(boolean) 5815 * 5816 * @return true if the view is currently pressed, false otherwise 5817 */ 5818 public boolean isPressed() { 5819 return (mPrivateFlags & PRESSED) == PRESSED; 5820 } 5821 5822 /** 5823 * Indicates whether this view will save its state (that is, 5824 * whether its {@link #onSaveInstanceState} method will be called). 5825 * 5826 * @return Returns true if the view state saving is enabled, else false. 5827 * 5828 * @see #setSaveEnabled(boolean) 5829 * @attr ref android.R.styleable#View_saveEnabled 5830 */ 5831 public boolean isSaveEnabled() { 5832 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5833 } 5834 5835 /** 5836 * Controls whether the saving of this view's state is 5837 * enabled (that is, whether its {@link #onSaveInstanceState} method 5838 * will be called). Note that even if freezing is enabled, the 5839 * view still must have an id assigned to it (via {@link #setId(int)}) 5840 * for its state to be saved. This flag can only disable the 5841 * saving of this view; any child views may still have their state saved. 5842 * 5843 * @param enabled Set to false to <em>disable</em> state saving, or true 5844 * (the default) to allow it. 5845 * 5846 * @see #isSaveEnabled() 5847 * @see #setId(int) 5848 * @see #onSaveInstanceState() 5849 * @attr ref android.R.styleable#View_saveEnabled 5850 */ 5851 public void setSaveEnabled(boolean enabled) { 5852 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5853 } 5854 5855 /** 5856 * Gets whether the framework should discard touches when the view's 5857 * window is obscured by another visible window. 5858 * Refer to the {@link View} security documentation for more details. 5859 * 5860 * @return True if touch filtering is enabled. 5861 * 5862 * @see #setFilterTouchesWhenObscured(boolean) 5863 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5864 */ 5865 @ViewDebug.ExportedProperty 5866 public boolean getFilterTouchesWhenObscured() { 5867 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5868 } 5869 5870 /** 5871 * Sets whether the framework should discard touches when the view's 5872 * window is obscured by another visible window. 5873 * Refer to the {@link View} security documentation for more details. 5874 * 5875 * @param enabled True if touch filtering should be enabled. 5876 * 5877 * @see #getFilterTouchesWhenObscured 5878 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5879 */ 5880 public void setFilterTouchesWhenObscured(boolean enabled) { 5881 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5882 FILTER_TOUCHES_WHEN_OBSCURED); 5883 } 5884 5885 /** 5886 * Indicates whether the entire hierarchy under this view will save its 5887 * state when a state saving traversal occurs from its parent. The default 5888 * is true; if false, these views will not be saved unless 5889 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5890 * 5891 * @return Returns true if the view state saving from parent is enabled, else false. 5892 * 5893 * @see #setSaveFromParentEnabled(boolean) 5894 */ 5895 public boolean isSaveFromParentEnabled() { 5896 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5897 } 5898 5899 /** 5900 * Controls whether the entire hierarchy under this view will save its 5901 * state when a state saving traversal occurs from its parent. The default 5902 * is true; if false, these views will not be saved unless 5903 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5904 * 5905 * @param enabled Set to false to <em>disable</em> state saving, or true 5906 * (the default) to allow it. 5907 * 5908 * @see #isSaveFromParentEnabled() 5909 * @see #setId(int) 5910 * @see #onSaveInstanceState() 5911 */ 5912 public void setSaveFromParentEnabled(boolean enabled) { 5913 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5914 } 5915 5916 5917 /** 5918 * Returns whether this View is able to take focus. 5919 * 5920 * @return True if this view can take focus, or false otherwise. 5921 * @attr ref android.R.styleable#View_focusable 5922 */ 5923 @ViewDebug.ExportedProperty(category = "focus") 5924 public final boolean isFocusable() { 5925 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5926 } 5927 5928 /** 5929 * When a view is focusable, it may not want to take focus when in touch mode. 5930 * For example, a button would like focus when the user is navigating via a D-pad 5931 * so that the user can click on it, but once the user starts touching the screen, 5932 * the button shouldn't take focus 5933 * @return Whether the view is focusable in touch mode. 5934 * @attr ref android.R.styleable#View_focusableInTouchMode 5935 */ 5936 @ViewDebug.ExportedProperty 5937 public final boolean isFocusableInTouchMode() { 5938 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5939 } 5940 5941 /** 5942 * Find the nearest view in the specified direction that can take focus. 5943 * This does not actually give focus to that view. 5944 * 5945 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5946 * 5947 * @return The nearest focusable in the specified direction, or null if none 5948 * can be found. 5949 */ 5950 public View focusSearch(int direction) { 5951 if (mParent != null) { 5952 return mParent.focusSearch(this, direction); 5953 } else { 5954 return null; 5955 } 5956 } 5957 5958 /** 5959 * This method is the last chance for the focused view and its ancestors to 5960 * respond to an arrow key. This is called when the focused view did not 5961 * consume the key internally, nor could the view system find a new view in 5962 * the requested direction to give focus to. 5963 * 5964 * @param focused The currently focused view. 5965 * @param direction The direction focus wants to move. One of FOCUS_UP, 5966 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5967 * @return True if the this view consumed this unhandled move. 5968 */ 5969 public boolean dispatchUnhandledMove(View focused, int direction) { 5970 return false; 5971 } 5972 5973 /** 5974 * If a user manually specified the next view id for a particular direction, 5975 * use the root to look up the view. 5976 * @param root The root view of the hierarchy containing this view. 5977 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5978 * or FOCUS_BACKWARD. 5979 * @return The user specified next view, or null if there is none. 5980 */ 5981 View findUserSetNextFocus(View root, int direction) { 5982 switch (direction) { 5983 case FOCUS_LEFT: 5984 if (mNextFocusLeftId == View.NO_ID) return null; 5985 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5986 case FOCUS_RIGHT: 5987 if (mNextFocusRightId == View.NO_ID) return null; 5988 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5989 case FOCUS_UP: 5990 if (mNextFocusUpId == View.NO_ID) return null; 5991 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5992 case FOCUS_DOWN: 5993 if (mNextFocusDownId == View.NO_ID) return null; 5994 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5995 case FOCUS_FORWARD: 5996 if (mNextFocusForwardId == View.NO_ID) return null; 5997 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5998 case FOCUS_BACKWARD: { 5999 if (mID == View.NO_ID) return null; 6000 final int id = mID; 6001 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6002 @Override 6003 public boolean apply(View t) { 6004 return t.mNextFocusForwardId == id; 6005 } 6006 }); 6007 } 6008 } 6009 return null; 6010 } 6011 6012 private View findViewInsideOutShouldExist(View root, final int childViewId) { 6013 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 6014 @Override 6015 public boolean apply(View t) { 6016 return t.mID == childViewId; 6017 } 6018 }); 6019 6020 if (result == null) { 6021 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 6022 + "by user for id " + childViewId); 6023 } 6024 return result; 6025 } 6026 6027 /** 6028 * Find and return all focusable views that are descendants of this view, 6029 * possibly including this view if it is focusable itself. 6030 * 6031 * @param direction The direction of the focus 6032 * @return A list of focusable views 6033 */ 6034 public ArrayList<View> getFocusables(int direction) { 6035 ArrayList<View> result = new ArrayList<View>(24); 6036 addFocusables(result, direction); 6037 return result; 6038 } 6039 6040 /** 6041 * Add any focusable views that are descendants of this view (possibly 6042 * including this view if it is focusable itself) to views. If we are in touch mode, 6043 * only add views that are also focusable in touch mode. 6044 * 6045 * @param views Focusable views found so far 6046 * @param direction The direction of the focus 6047 */ 6048 public void addFocusables(ArrayList<View> views, int direction) { 6049 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 6050 } 6051 6052 /** 6053 * Adds any focusable views that are descendants of this view (possibly 6054 * including this view if it is focusable itself) to views. This method 6055 * adds all focusable views regardless if we are in touch mode or 6056 * only views focusable in touch mode if we are in touch mode or 6057 * only views that can take accessibility focus if accessibility is enabeld 6058 * depending on the focusable mode paramater. 6059 * 6060 * @param views Focusable views found so far or null if all we are interested is 6061 * the number of focusables. 6062 * @param direction The direction of the focus. 6063 * @param focusableMode The type of focusables to be added. 6064 * 6065 * @see #FOCUSABLES_ALL 6066 * @see #FOCUSABLES_TOUCH_MODE 6067 */ 6068 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 6069 if (views == null) { 6070 return; 6071 } 6072 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 6073 if (canTakeAccessibilityFocusFromHover() || getAccessibilityNodeProvider() != null) { 6074 views.add(this); 6075 return; 6076 } 6077 } 6078 if (!isFocusable()) { 6079 return; 6080 } 6081 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 6082 && isInTouchMode() && !isFocusableInTouchMode()) { 6083 return; 6084 } 6085 views.add(this); 6086 } 6087 6088 /** 6089 * Finds the Views that contain given text. The containment is case insensitive. 6090 * The search is performed by either the text that the View renders or the content 6091 * description that describes the view for accessibility purposes and the view does 6092 * not render or both. Clients can specify how the search is to be performed via 6093 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 6094 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 6095 * 6096 * @param outViews The output list of matching Views. 6097 * @param searched The text to match against. 6098 * 6099 * @see #FIND_VIEWS_WITH_TEXT 6100 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 6101 * @see #setContentDescription(CharSequence) 6102 */ 6103 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 6104 if (getAccessibilityNodeProvider() != null) { 6105 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 6106 outViews.add(this); 6107 } 6108 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 6109 && (searched != null && searched.length() > 0) 6110 && (mContentDescription != null && mContentDescription.length() > 0)) { 6111 String searchedLowerCase = searched.toString().toLowerCase(); 6112 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 6113 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 6114 outViews.add(this); 6115 } 6116 } 6117 } 6118 6119 /** 6120 * Find and return all touchable views that are descendants of this view, 6121 * possibly including this view if it is touchable itself. 6122 * 6123 * @return A list of touchable views 6124 */ 6125 public ArrayList<View> getTouchables() { 6126 ArrayList<View> result = new ArrayList<View>(); 6127 addTouchables(result); 6128 return result; 6129 } 6130 6131 /** 6132 * Add any touchable views that are descendants of this view (possibly 6133 * including this view if it is touchable itself) to views. 6134 * 6135 * @param views Touchable views found so far 6136 */ 6137 public void addTouchables(ArrayList<View> views) { 6138 final int viewFlags = mViewFlags; 6139 6140 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 6141 && (viewFlags & ENABLED_MASK) == ENABLED) { 6142 views.add(this); 6143 } 6144 } 6145 6146 /** 6147 * Returns whether this View is accessibility focused. 6148 * 6149 * @return True if this View is accessibility focused. 6150 */ 6151 boolean isAccessibilityFocused() { 6152 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 6153 } 6154 6155 /** 6156 * Call this to try to give accessibility focus to this view. 6157 * 6158 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6159 * returns false or the view is no visible or the view already has accessibility 6160 * focus. 6161 * 6162 * See also {@link #focusSearch(int)}, which is what you call to say that you 6163 * have focus, and you want your parent to look for the next one. 6164 * 6165 * @return Whether this view actually took accessibility focus. 6166 * 6167 * @hide 6168 */ 6169 public boolean requestAccessibilityFocus() { 6170 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6171 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6172 return false; 6173 } 6174 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6175 return false; 6176 } 6177 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6178 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6179 ViewRootImpl viewRootImpl = getViewRootImpl(); 6180 if (viewRootImpl != null) { 6181 viewRootImpl.setAccessibilityFocusedHost(this); 6182 } 6183 invalidate(); 6184 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6185 notifyAccessibilityStateChanged(); 6186 // Try to give input focus to this view - not a descendant. 6187 requestFocusNoSearch(View.FOCUS_DOWN, null); 6188 return true; 6189 } 6190 return false; 6191 } 6192 6193 /** 6194 * Call this to try to clear accessibility focus of this view. 6195 * 6196 * See also {@link #focusSearch(int)}, which is what you call to say that you 6197 * have focus, and you want your parent to look for the next one. 6198 * 6199 * @hide 6200 */ 6201 public void clearAccessibilityFocus() { 6202 ViewRootImpl viewRootImpl = getViewRootImpl(); 6203 if (viewRootImpl != null) { 6204 View focusHost = viewRootImpl.getAccessibilityFocusedHost(); 6205 if (focusHost != null && focusHost != this 6206 && ViewRootImpl.isViewDescendantOf(focusHost, this)) { 6207 viewRootImpl.setAccessibilityFocusedHost(null); 6208 } 6209 } 6210 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6211 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6212 invalidate(); 6213 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6214 notifyAccessibilityStateChanged(); 6215 6216 // Clear the text navigation state. 6217 setAccessibilityCursorPosition(-1); 6218 6219 // Try to move accessibility focus to the input focus. 6220 View rootView = getRootView(); 6221 if (rootView != null) { 6222 View inputFocus = rootView.findFocus(); 6223 if (inputFocus != null) { 6224 inputFocus.requestAccessibilityFocus(); 6225 } 6226 } 6227 } 6228 } 6229 6230 private void requestAccessibilityFocusFromHover() { 6231 if (includeForAccessibility() && isActionableForAccessibility()) { 6232 requestAccessibilityFocus(); 6233 } else { 6234 if (mParent != null) { 6235 View nextFocus = mParent.findViewToTakeAccessibilityFocusFromHover(this, this); 6236 if (nextFocus != null) { 6237 nextFocus.requestAccessibilityFocus(); 6238 } 6239 } 6240 } 6241 } 6242 6243 /** 6244 * @hide 6245 */ 6246 public boolean canTakeAccessibilityFocusFromHover() { 6247 if (includeForAccessibility() && isActionableForAccessibility()) { 6248 return true; 6249 } 6250 if (mParent != null) { 6251 return (mParent.findViewToTakeAccessibilityFocusFromHover(this, this) == this); 6252 } 6253 return false; 6254 } 6255 6256 /** 6257 * Clears accessibility focus without calling any callback methods 6258 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6259 * is used for clearing accessibility focus when giving this focus to 6260 * another view. 6261 */ 6262 void clearAccessibilityFocusNoCallbacks() { 6263 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6264 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6265 invalidate(); 6266 } 6267 } 6268 6269 /** 6270 * Call this to try to give focus to a specific view or to one of its 6271 * descendants. 6272 * 6273 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6274 * false), or if it is focusable and it is not focusable in touch mode 6275 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6276 * 6277 * See also {@link #focusSearch(int)}, which is what you call to say that you 6278 * have focus, and you want your parent to look for the next one. 6279 * 6280 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6281 * {@link #FOCUS_DOWN} and <code>null</code>. 6282 * 6283 * @return Whether this view or one of its descendants actually took focus. 6284 */ 6285 public final boolean requestFocus() { 6286 return requestFocus(View.FOCUS_DOWN); 6287 } 6288 6289 /** 6290 * Call this to try to give focus to a specific view or to one of its 6291 * descendants and give it a hint about what direction focus is heading. 6292 * 6293 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6294 * false), or if it is focusable and it is not focusable in touch mode 6295 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6296 * 6297 * See also {@link #focusSearch(int)}, which is what you call to say that you 6298 * have focus, and you want your parent to look for the next one. 6299 * 6300 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6301 * <code>null</code> set for the previously focused rectangle. 6302 * 6303 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6304 * @return Whether this view or one of its descendants actually took focus. 6305 */ 6306 public final boolean requestFocus(int direction) { 6307 return requestFocus(direction, null); 6308 } 6309 6310 /** 6311 * Call this to try to give focus to a specific view or to one of its descendants 6312 * and give it hints about the direction and a specific rectangle that the focus 6313 * is coming from. The rectangle can help give larger views a finer grained hint 6314 * about where focus is coming from, and therefore, where to show selection, or 6315 * forward focus change internally. 6316 * 6317 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6318 * false), or if it is focusable and it is not focusable in touch mode 6319 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6320 * 6321 * A View will not take focus if it is not visible. 6322 * 6323 * A View will not take focus if one of its parents has 6324 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6325 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6326 * 6327 * See also {@link #focusSearch(int)}, which is what you call to say that you 6328 * have focus, and you want your parent to look for the next one. 6329 * 6330 * You may wish to override this method if your custom {@link View} has an internal 6331 * {@link View} that it wishes to forward the request to. 6332 * 6333 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6334 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6335 * to give a finer grained hint about where focus is coming from. May be null 6336 * if there is no hint. 6337 * @return Whether this view or one of its descendants actually took focus. 6338 */ 6339 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6340 return requestFocusNoSearch(direction, previouslyFocusedRect); 6341 } 6342 6343 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6344 // need to be focusable 6345 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6346 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6347 return false; 6348 } 6349 6350 // need to be focusable in touch mode if in touch mode 6351 if (isInTouchMode() && 6352 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6353 return false; 6354 } 6355 6356 // need to not have any parents blocking us 6357 if (hasAncestorThatBlocksDescendantFocus()) { 6358 return false; 6359 } 6360 6361 handleFocusGainInternal(direction, previouslyFocusedRect); 6362 return true; 6363 } 6364 6365 /** 6366 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6367 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6368 * touch mode to request focus when they are touched. 6369 * 6370 * @return Whether this view or one of its descendants actually took focus. 6371 * 6372 * @see #isInTouchMode() 6373 * 6374 */ 6375 public final boolean requestFocusFromTouch() { 6376 // Leave touch mode if we need to 6377 if (isInTouchMode()) { 6378 ViewRootImpl viewRoot = getViewRootImpl(); 6379 if (viewRoot != null) { 6380 viewRoot.ensureTouchMode(false); 6381 } 6382 } 6383 return requestFocus(View.FOCUS_DOWN); 6384 } 6385 6386 /** 6387 * @return Whether any ancestor of this view blocks descendant focus. 6388 */ 6389 private boolean hasAncestorThatBlocksDescendantFocus() { 6390 ViewParent ancestor = mParent; 6391 while (ancestor instanceof ViewGroup) { 6392 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6393 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6394 return true; 6395 } else { 6396 ancestor = vgAncestor.getParent(); 6397 } 6398 } 6399 return false; 6400 } 6401 6402 /** 6403 * Gets the mode for determining whether this View is important for accessibility 6404 * which is if it fires accessibility events and if it is reported to 6405 * accessibility services that query the screen. 6406 * 6407 * @return The mode for determining whether a View is important for accessibility. 6408 * 6409 * @attr ref android.R.styleable#View_importantForAccessibility 6410 * 6411 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6412 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6413 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6414 */ 6415 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6416 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6417 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6418 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6419 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6420 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6421 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6422 }) 6423 public int getImportantForAccessibility() { 6424 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6425 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6426 } 6427 6428 /** 6429 * Sets how to determine whether this view is important for accessibility 6430 * which is if it fires accessibility events and if it is reported to 6431 * accessibility services that query the screen. 6432 * 6433 * @param mode How to determine whether this view is important for accessibility. 6434 * 6435 * @attr ref android.R.styleable#View_importantForAccessibility 6436 * 6437 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6438 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6439 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6440 */ 6441 public void setImportantForAccessibility(int mode) { 6442 if (mode != getImportantForAccessibility()) { 6443 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6444 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6445 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6446 notifyAccessibilityStateChanged(); 6447 } 6448 } 6449 6450 /** 6451 * Gets whether this view should be exposed for accessibility. 6452 * 6453 * @return Whether the view is exposed for accessibility. 6454 * 6455 * @hide 6456 */ 6457 public boolean isImportantForAccessibility() { 6458 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6459 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6460 switch (mode) { 6461 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6462 return true; 6463 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6464 return false; 6465 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6466 return isActionableForAccessibility() || hasListenersForAccessibility(); 6467 default: 6468 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6469 + mode); 6470 } 6471 } 6472 6473 /** 6474 * Gets the parent for accessibility purposes. Note that the parent for 6475 * accessibility is not necessary the immediate parent. It is the first 6476 * predecessor that is important for accessibility. 6477 * 6478 * @return The parent for accessibility purposes. 6479 */ 6480 public ViewParent getParentForAccessibility() { 6481 if (mParent instanceof View) { 6482 View parentView = (View) mParent; 6483 if (parentView.includeForAccessibility()) { 6484 return mParent; 6485 } else { 6486 return mParent.getParentForAccessibility(); 6487 } 6488 } 6489 return null; 6490 } 6491 6492 /** 6493 * Adds the children of a given View for accessibility. Since some Views are 6494 * not important for accessibility the children for accessibility are not 6495 * necessarily direct children of the riew, rather they are the first level of 6496 * descendants important for accessibility. 6497 * 6498 * @param children The list of children for accessibility. 6499 */ 6500 public void addChildrenForAccessibility(ArrayList<View> children) { 6501 if (includeForAccessibility()) { 6502 children.add(this); 6503 } 6504 } 6505 6506 /** 6507 * Whether to regard this view for accessibility. A view is regarded for 6508 * accessibility if it is important for accessibility or the querying 6509 * accessibility service has explicitly requested that view not 6510 * important for accessibility are regarded. 6511 * 6512 * @return Whether to regard the view for accessibility. 6513 * 6514 * @hide 6515 */ 6516 public boolean includeForAccessibility() { 6517 if (mAttachInfo != null) { 6518 if (!mAttachInfo.mIncludeNotImportantViews) { 6519 return isImportantForAccessibility(); 6520 } 6521 return true; 6522 } 6523 return false; 6524 } 6525 6526 /** 6527 * Returns whether the View is considered actionable from 6528 * accessibility perspective. Such view are important for 6529 * accessiiblity. 6530 * 6531 * @return True if the view is actionable for accessibility. 6532 * 6533 * @hide 6534 */ 6535 public boolean isActionableForAccessibility() { 6536 return (isClickable() || isLongClickable() || isFocusable()); 6537 } 6538 6539 /** 6540 * Returns whether the View has registered callbacks wich makes it 6541 * important for accessiiblity. 6542 * 6543 * @return True if the view is actionable for accessibility. 6544 */ 6545 private boolean hasListenersForAccessibility() { 6546 ListenerInfo info = getListenerInfo(); 6547 return mTouchDelegate != null || info.mOnKeyListener != null 6548 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6549 || info.mOnHoverListener != null || info.mOnDragListener != null; 6550 } 6551 6552 /** 6553 * Notifies accessibility services that some view's important for 6554 * accessibility state has changed. Note that such notifications 6555 * are made at most once every 6556 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6557 * to avoid unnecessary load to the system. Also once a view has 6558 * made a notifucation this method is a NOP until the notification has 6559 * been sent to clients. 6560 * 6561 * @hide 6562 * 6563 * TODO: Makse sure this method is called for any view state change 6564 * that is interesting for accessilility purposes. 6565 */ 6566 public void notifyAccessibilityStateChanged() { 6567 if (!AccessibilityManager.getInstance(mContext).isEnabled()) { 6568 return; 6569 } 6570 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6571 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6572 if (mParent != null) { 6573 mParent.childAccessibilityStateChanged(this); 6574 } 6575 } 6576 } 6577 6578 /** 6579 * Reset the state indicating the this view has requested clients 6580 * interested in its accessiblity state to be notified. 6581 * 6582 * @hide 6583 */ 6584 public void resetAccessibilityStateChanged() { 6585 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6586 } 6587 6588 /** 6589 * Performs the specified accessibility action on the view. For 6590 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6591 * <p> 6592 * If an {@link AccessibilityDelegate} has been specified via calling 6593 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 6594 * {@link AccessibilityDelegate#performAccessibilityAction(View, int, Bundle)} 6595 * is responsible for handling this call. 6596 * </p> 6597 * 6598 * @param action The action to perform. 6599 * @param arguments Optional action arguments. 6600 * @return Whether the action was performed. 6601 */ 6602 public boolean performAccessibilityAction(int action, Bundle arguments) { 6603 if (mAccessibilityDelegate != null) { 6604 return mAccessibilityDelegate.performAccessibilityAction(this, action, arguments); 6605 } else { 6606 return performAccessibilityActionInternal(action, arguments); 6607 } 6608 } 6609 6610 /** 6611 * @see #performAccessibilityAction(int, Bundle) 6612 * 6613 * Note: Called from the default {@link AccessibilityDelegate}. 6614 */ 6615 boolean performAccessibilityActionInternal(int action, Bundle arguments) { 6616 switch (action) { 6617 case AccessibilityNodeInfo.ACTION_CLICK: { 6618 if (isClickable()) { 6619 return performClick(); 6620 } 6621 } break; 6622 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6623 if (isLongClickable()) { 6624 return performLongClick(); 6625 } 6626 } break; 6627 case AccessibilityNodeInfo.ACTION_FOCUS: { 6628 if (!hasFocus()) { 6629 // Get out of touch mode since accessibility 6630 // wants to move focus around. 6631 getViewRootImpl().ensureTouchMode(false); 6632 return requestFocus(); 6633 } 6634 } break; 6635 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6636 if (hasFocus()) { 6637 clearFocus(); 6638 return !isFocused(); 6639 } 6640 } break; 6641 case AccessibilityNodeInfo.ACTION_SELECT: { 6642 if (!isSelected()) { 6643 setSelected(true); 6644 return isSelected(); 6645 } 6646 } break; 6647 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6648 if (isSelected()) { 6649 setSelected(false); 6650 return !isSelected(); 6651 } 6652 } break; 6653 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6654 if (!isAccessibilityFocused()) { 6655 return requestAccessibilityFocus(); 6656 } 6657 } break; 6658 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6659 if (isAccessibilityFocused()) { 6660 clearAccessibilityFocus(); 6661 return true; 6662 } 6663 } break; 6664 case AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY: { 6665 if (arguments != null) { 6666 final int granularity = arguments.getInt( 6667 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6668 return nextAtGranularity(granularity); 6669 } 6670 } break; 6671 case AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY: { 6672 if (arguments != null) { 6673 final int granularity = arguments.getInt( 6674 AccessibilityNodeInfo.ACTION_ARGUMENT_MOVEMENT_GRANULARITY_INT); 6675 return previousAtGranularity(granularity); 6676 } 6677 } break; 6678 } 6679 return false; 6680 } 6681 6682 private boolean nextAtGranularity(int granularity) { 6683 CharSequence text = getIterableTextForAccessibility(); 6684 if (text == null || text.length() == 0) { 6685 return false; 6686 } 6687 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6688 if (iterator == null) { 6689 return false; 6690 } 6691 final int current = getAccessibilityCursorPosition(); 6692 final int[] range = iterator.following(current); 6693 if (range == null) { 6694 setAccessibilityCursorPosition(-1); 6695 return false; 6696 } 6697 final int start = range[0]; 6698 final int end = range[1]; 6699 setAccessibilityCursorPosition(start); 6700 sendViewTextTraversedAtGranularityEvent( 6701 AccessibilityNodeInfo.ACTION_NEXT_AT_MOVEMENT_GRANULARITY, 6702 granularity, start, end); 6703 return true; 6704 } 6705 6706 private boolean previousAtGranularity(int granularity) { 6707 CharSequence text = getIterableTextForAccessibility(); 6708 if (text == null || text.length() == 0) { 6709 return false; 6710 } 6711 TextSegmentIterator iterator = getIteratorForGranularity(granularity); 6712 if (iterator == null) { 6713 return false; 6714 } 6715 final int selectionStart = getAccessibilityCursorPosition(); 6716 final int current = selectionStart >= 0 ? selectionStart : text.length() + 1; 6717 final int[] range = iterator.preceding(current); 6718 if (range == null) { 6719 setAccessibilityCursorPosition(-1); 6720 return false; 6721 } 6722 final int start = range[0]; 6723 final int end = range[1]; 6724 setAccessibilityCursorPosition(end); 6725 sendViewTextTraversedAtGranularityEvent( 6726 AccessibilityNodeInfo.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, 6727 granularity, start, end); 6728 return true; 6729 } 6730 6731 /** 6732 * Gets the text reported for accessibility purposes. 6733 * 6734 * @return The accessibility text. 6735 * 6736 * @hide 6737 */ 6738 public CharSequence getIterableTextForAccessibility() { 6739 return mContentDescription; 6740 } 6741 6742 /** 6743 * @hide 6744 */ 6745 public int getAccessibilityCursorPosition() { 6746 return mAccessibilityCursorPosition; 6747 } 6748 6749 /** 6750 * @hide 6751 */ 6752 public void setAccessibilityCursorPosition(int position) { 6753 mAccessibilityCursorPosition = position; 6754 } 6755 6756 private void sendViewTextTraversedAtGranularityEvent(int action, int granularity, 6757 int fromIndex, int toIndex) { 6758 if (mParent == null) { 6759 return; 6760 } 6761 AccessibilityEvent event = AccessibilityEvent.obtain( 6762 AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY); 6763 onInitializeAccessibilityEvent(event); 6764 onPopulateAccessibilityEvent(event); 6765 event.setFromIndex(fromIndex); 6766 event.setToIndex(toIndex); 6767 event.setAction(action); 6768 event.setMovementGranularity(granularity); 6769 mParent.requestSendAccessibilityEvent(this, event); 6770 } 6771 6772 /** 6773 * @hide 6774 */ 6775 public TextSegmentIterator getIteratorForGranularity(int granularity) { 6776 switch (granularity) { 6777 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_CHARACTER: { 6778 CharSequence text = getIterableTextForAccessibility(); 6779 if (text != null && text.length() > 0) { 6780 CharacterTextSegmentIterator iterator = 6781 CharacterTextSegmentIterator.getInstance(mContext); 6782 iterator.initialize(text.toString()); 6783 return iterator; 6784 } 6785 } break; 6786 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_WORD: { 6787 CharSequence text = getIterableTextForAccessibility(); 6788 if (text != null && text.length() > 0) { 6789 WordTextSegmentIterator iterator = 6790 WordTextSegmentIterator.getInstance(mContext); 6791 iterator.initialize(text.toString()); 6792 return iterator; 6793 } 6794 } break; 6795 case AccessibilityNodeInfo.MOVEMENT_GRANULARITY_PARAGRAPH: { 6796 CharSequence text = getIterableTextForAccessibility(); 6797 if (text != null && text.length() > 0) { 6798 ParagraphTextSegmentIterator iterator = 6799 ParagraphTextSegmentIterator.getInstance(); 6800 iterator.initialize(text.toString()); 6801 return iterator; 6802 } 6803 } break; 6804 } 6805 return null; 6806 } 6807 6808 /** 6809 * @hide 6810 */ 6811 public void dispatchStartTemporaryDetach() { 6812 clearAccessibilityFocus(); 6813 onStartTemporaryDetach(); 6814 } 6815 6816 /** 6817 * This is called when a container is going to temporarily detach a child, with 6818 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6819 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6820 * {@link #onDetachedFromWindow()} when the container is done. 6821 */ 6822 public void onStartTemporaryDetach() { 6823 removeUnsetPressCallback(); 6824 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6825 } 6826 6827 /** 6828 * @hide 6829 */ 6830 public void dispatchFinishTemporaryDetach() { 6831 onFinishTemporaryDetach(); 6832 } 6833 6834 /** 6835 * Called after {@link #onStartTemporaryDetach} when the container is done 6836 * changing the view. 6837 */ 6838 public void onFinishTemporaryDetach() { 6839 } 6840 6841 /** 6842 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6843 * for this view's window. Returns null if the view is not currently attached 6844 * to the window. Normally you will not need to use this directly, but 6845 * just use the standard high-level event callbacks like 6846 * {@link #onKeyDown(int, KeyEvent)}. 6847 */ 6848 public KeyEvent.DispatcherState getKeyDispatcherState() { 6849 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6850 } 6851 6852 /** 6853 * Dispatch a key event before it is processed by any input method 6854 * associated with the view hierarchy. This can be used to intercept 6855 * key events in special situations before the IME consumes them; a 6856 * typical example would be handling the BACK key to update the application's 6857 * UI instead of allowing the IME to see it and close itself. 6858 * 6859 * @param event The key event to be dispatched. 6860 * @return True if the event was handled, false otherwise. 6861 */ 6862 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6863 return onKeyPreIme(event.getKeyCode(), event); 6864 } 6865 6866 /** 6867 * Dispatch a key event to the next view on the focus path. This path runs 6868 * from the top of the view tree down to the currently focused view. If this 6869 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6870 * the next node down the focus path. This method also fires any key 6871 * listeners. 6872 * 6873 * @param event The key event to be dispatched. 6874 * @return True if the event was handled, false otherwise. 6875 */ 6876 public boolean dispatchKeyEvent(KeyEvent event) { 6877 if (mInputEventConsistencyVerifier != null) { 6878 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6879 } 6880 6881 // Give any attached key listener a first crack at the event. 6882 //noinspection SimplifiableIfStatement 6883 ListenerInfo li = mListenerInfo; 6884 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6885 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6886 return true; 6887 } 6888 6889 if (event.dispatch(this, mAttachInfo != null 6890 ? mAttachInfo.mKeyDispatchState : null, this)) { 6891 return true; 6892 } 6893 6894 if (mInputEventConsistencyVerifier != null) { 6895 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6896 } 6897 return false; 6898 } 6899 6900 /** 6901 * Dispatches a key shortcut event. 6902 * 6903 * @param event The key event to be dispatched. 6904 * @return True if the event was handled by the view, false otherwise. 6905 */ 6906 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6907 return onKeyShortcut(event.getKeyCode(), event); 6908 } 6909 6910 /** 6911 * Pass the touch screen motion event down to the target view, or this 6912 * view if it is the target. 6913 * 6914 * @param event The motion event to be dispatched. 6915 * @return True if the event was handled by the view, false otherwise. 6916 */ 6917 public boolean dispatchTouchEvent(MotionEvent event) { 6918 if (mInputEventConsistencyVerifier != null) { 6919 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6920 } 6921 6922 if (onFilterTouchEventForSecurity(event)) { 6923 //noinspection SimplifiableIfStatement 6924 ListenerInfo li = mListenerInfo; 6925 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6926 && li.mOnTouchListener.onTouch(this, event)) { 6927 return true; 6928 } 6929 6930 if (onTouchEvent(event)) { 6931 return true; 6932 } 6933 } 6934 6935 if (mInputEventConsistencyVerifier != null) { 6936 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6937 } 6938 return false; 6939 } 6940 6941 /** 6942 * Filter the touch event to apply security policies. 6943 * 6944 * @param event The motion event to be filtered. 6945 * @return True if the event should be dispatched, false if the event should be dropped. 6946 * 6947 * @see #getFilterTouchesWhenObscured 6948 */ 6949 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6950 //noinspection RedundantIfStatement 6951 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6952 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6953 // Window is obscured, drop this touch. 6954 return false; 6955 } 6956 return true; 6957 } 6958 6959 /** 6960 * Pass a trackball motion event down to the focused view. 6961 * 6962 * @param event The motion event to be dispatched. 6963 * @return True if the event was handled by the view, false otherwise. 6964 */ 6965 public boolean dispatchTrackballEvent(MotionEvent event) { 6966 if (mInputEventConsistencyVerifier != null) { 6967 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6968 } 6969 6970 return onTrackballEvent(event); 6971 } 6972 6973 /** 6974 * Dispatch a generic motion event. 6975 * <p> 6976 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6977 * are delivered to the view under the pointer. All other generic motion events are 6978 * delivered to the focused view. Hover events are handled specially and are delivered 6979 * to {@link #onHoverEvent(MotionEvent)}. 6980 * </p> 6981 * 6982 * @param event The motion event to be dispatched. 6983 * @return True if the event was handled by the view, false otherwise. 6984 */ 6985 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6986 if (mInputEventConsistencyVerifier != null) { 6987 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6988 } 6989 6990 final int source = event.getSource(); 6991 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6992 final int action = event.getAction(); 6993 if (action == MotionEvent.ACTION_HOVER_ENTER 6994 || action == MotionEvent.ACTION_HOVER_MOVE 6995 || action == MotionEvent.ACTION_HOVER_EXIT) { 6996 if (dispatchHoverEvent(event)) { 6997 return true; 6998 } 6999 } else if (dispatchGenericPointerEvent(event)) { 7000 return true; 7001 } 7002 } else if (dispatchGenericFocusedEvent(event)) { 7003 return true; 7004 } 7005 7006 if (dispatchGenericMotionEventInternal(event)) { 7007 return true; 7008 } 7009 7010 if (mInputEventConsistencyVerifier != null) { 7011 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7012 } 7013 return false; 7014 } 7015 7016 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 7017 //noinspection SimplifiableIfStatement 7018 ListenerInfo li = mListenerInfo; 7019 if (li != null && li.mOnGenericMotionListener != null 7020 && (mViewFlags & ENABLED_MASK) == ENABLED 7021 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 7022 return true; 7023 } 7024 7025 if (onGenericMotionEvent(event)) { 7026 return true; 7027 } 7028 7029 if (mInputEventConsistencyVerifier != null) { 7030 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 7031 } 7032 return false; 7033 } 7034 7035 /** 7036 * Dispatch a hover event. 7037 * <p> 7038 * Do not call this method directly. 7039 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7040 * </p> 7041 * 7042 * @param event The motion event to be dispatched. 7043 * @return True if the event was handled by the view, false otherwise. 7044 */ 7045 protected boolean dispatchHoverEvent(MotionEvent event) { 7046 //noinspection SimplifiableIfStatement 7047 ListenerInfo li = mListenerInfo; 7048 if (li != null && li.mOnHoverListener != null 7049 && (mViewFlags & ENABLED_MASK) == ENABLED 7050 && li.mOnHoverListener.onHover(this, event)) { 7051 return true; 7052 } 7053 7054 return onHoverEvent(event); 7055 } 7056 7057 /** 7058 * Returns true if the view has a child to which it has recently sent 7059 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 7060 * it does not have a hovered child, then it must be the innermost hovered view. 7061 * @hide 7062 */ 7063 protected boolean hasHoveredChild() { 7064 return false; 7065 } 7066 7067 /** 7068 * Dispatch a generic motion event to the view under the first pointer. 7069 * <p> 7070 * Do not call this method directly. 7071 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7072 * </p> 7073 * 7074 * @param event The motion event to be dispatched. 7075 * @return True if the event was handled by the view, false otherwise. 7076 */ 7077 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 7078 return false; 7079 } 7080 7081 /** 7082 * Dispatch a generic motion event to the currently focused view. 7083 * <p> 7084 * Do not call this method directly. 7085 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 7086 * </p> 7087 * 7088 * @param event The motion event to be dispatched. 7089 * @return True if the event was handled by the view, false otherwise. 7090 */ 7091 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 7092 return false; 7093 } 7094 7095 /** 7096 * Dispatch a pointer event. 7097 * <p> 7098 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 7099 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 7100 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 7101 * and should not be expected to handle other pointing device features. 7102 * </p> 7103 * 7104 * @param event The motion event to be dispatched. 7105 * @return True if the event was handled by the view, false otherwise. 7106 * @hide 7107 */ 7108 public final boolean dispatchPointerEvent(MotionEvent event) { 7109 if (event.isTouchEvent()) { 7110 return dispatchTouchEvent(event); 7111 } else { 7112 return dispatchGenericMotionEvent(event); 7113 } 7114 } 7115 7116 /** 7117 * Called when the window containing this view gains or loses window focus. 7118 * ViewGroups should override to route to their children. 7119 * 7120 * @param hasFocus True if the window containing this view now has focus, 7121 * false otherwise. 7122 */ 7123 public void dispatchWindowFocusChanged(boolean hasFocus) { 7124 onWindowFocusChanged(hasFocus); 7125 } 7126 7127 /** 7128 * Called when the window containing this view gains or loses focus. Note 7129 * that this is separate from view focus: to receive key events, both 7130 * your view and its window must have focus. If a window is displayed 7131 * on top of yours that takes input focus, then your own window will lose 7132 * focus but the view focus will remain unchanged. 7133 * 7134 * @param hasWindowFocus True if the window containing this view now has 7135 * focus, false otherwise. 7136 */ 7137 public void onWindowFocusChanged(boolean hasWindowFocus) { 7138 InputMethodManager imm = InputMethodManager.peekInstance(); 7139 if (!hasWindowFocus) { 7140 if (isPressed()) { 7141 setPressed(false); 7142 } 7143 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7144 imm.focusOut(this); 7145 } 7146 removeLongPressCallback(); 7147 removeTapCallback(); 7148 onFocusLost(); 7149 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 7150 imm.focusIn(this); 7151 } 7152 refreshDrawableState(); 7153 } 7154 7155 /** 7156 * Returns true if this view is in a window that currently has window focus. 7157 * Note that this is not the same as the view itself having focus. 7158 * 7159 * @return True if this view is in a window that currently has window focus. 7160 */ 7161 public boolean hasWindowFocus() { 7162 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 7163 } 7164 7165 /** 7166 * Dispatch a view visibility change down the view hierarchy. 7167 * ViewGroups should override to route to their children. 7168 * @param changedView The view whose visibility changed. Could be 'this' or 7169 * an ancestor view. 7170 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7171 * {@link #INVISIBLE} or {@link #GONE}. 7172 */ 7173 protected void dispatchVisibilityChanged(View changedView, int visibility) { 7174 onVisibilityChanged(changedView, visibility); 7175 } 7176 7177 /** 7178 * Called when the visibility of the view or an ancestor of the view is changed. 7179 * @param changedView The view whose visibility changed. Could be 'this' or 7180 * an ancestor view. 7181 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 7182 * {@link #INVISIBLE} or {@link #GONE}. 7183 */ 7184 protected void onVisibilityChanged(View changedView, int visibility) { 7185 if (visibility == VISIBLE) { 7186 if (mAttachInfo != null) { 7187 initialAwakenScrollBars(); 7188 } else { 7189 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 7190 } 7191 } 7192 } 7193 7194 /** 7195 * Dispatch a hint about whether this view is displayed. For instance, when 7196 * a View moves out of the screen, it might receives a display hint indicating 7197 * the view is not displayed. Applications should not <em>rely</em> on this hint 7198 * as there is no guarantee that they will receive one. 7199 * 7200 * @param hint A hint about whether or not this view is displayed: 7201 * {@link #VISIBLE} or {@link #INVISIBLE}. 7202 */ 7203 public void dispatchDisplayHint(int hint) { 7204 onDisplayHint(hint); 7205 } 7206 7207 /** 7208 * Gives this view a hint about whether is displayed or not. For instance, when 7209 * a View moves out of the screen, it might receives a display hint indicating 7210 * the view is not displayed. Applications should not <em>rely</em> on this hint 7211 * as there is no guarantee that they will receive one. 7212 * 7213 * @param hint A hint about whether or not this view is displayed: 7214 * {@link #VISIBLE} or {@link #INVISIBLE}. 7215 */ 7216 protected void onDisplayHint(int hint) { 7217 } 7218 7219 /** 7220 * Dispatch a window visibility change down the view hierarchy. 7221 * ViewGroups should override to route to their children. 7222 * 7223 * @param visibility The new visibility of the window. 7224 * 7225 * @see #onWindowVisibilityChanged(int) 7226 */ 7227 public void dispatchWindowVisibilityChanged(int visibility) { 7228 onWindowVisibilityChanged(visibility); 7229 } 7230 7231 /** 7232 * Called when the window containing has change its visibility 7233 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 7234 * that this tells you whether or not your window is being made visible 7235 * to the window manager; this does <em>not</em> tell you whether or not 7236 * your window is obscured by other windows on the screen, even if it 7237 * is itself visible. 7238 * 7239 * @param visibility The new visibility of the window. 7240 */ 7241 protected void onWindowVisibilityChanged(int visibility) { 7242 if (visibility == VISIBLE) { 7243 initialAwakenScrollBars(); 7244 } 7245 } 7246 7247 /** 7248 * Returns the current visibility of the window this view is attached to 7249 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 7250 * 7251 * @return Returns the current visibility of the view's window. 7252 */ 7253 public int getWindowVisibility() { 7254 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 7255 } 7256 7257 /** 7258 * Retrieve the overall visible display size in which the window this view is 7259 * attached to has been positioned in. This takes into account screen 7260 * decorations above the window, for both cases where the window itself 7261 * is being position inside of them or the window is being placed under 7262 * then and covered insets are used for the window to position its content 7263 * inside. In effect, this tells you the available area where content can 7264 * be placed and remain visible to users. 7265 * 7266 * <p>This function requires an IPC back to the window manager to retrieve 7267 * the requested information, so should not be used in performance critical 7268 * code like drawing. 7269 * 7270 * @param outRect Filled in with the visible display frame. If the view 7271 * is not attached to a window, this is simply the raw display size. 7272 */ 7273 public void getWindowVisibleDisplayFrame(Rect outRect) { 7274 if (mAttachInfo != null) { 7275 try { 7276 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 7277 } catch (RemoteException e) { 7278 return; 7279 } 7280 // XXX This is really broken, and probably all needs to be done 7281 // in the window manager, and we need to know more about whether 7282 // we want the area behind or in front of the IME. 7283 final Rect insets = mAttachInfo.mVisibleInsets; 7284 outRect.left += insets.left; 7285 outRect.top += insets.top; 7286 outRect.right -= insets.right; 7287 outRect.bottom -= insets.bottom; 7288 return; 7289 } 7290 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 7291 d.getRectSize(outRect); 7292 } 7293 7294 /** 7295 * Dispatch a notification about a resource configuration change down 7296 * the view hierarchy. 7297 * ViewGroups should override to route to their children. 7298 * 7299 * @param newConfig The new resource configuration. 7300 * 7301 * @see #onConfigurationChanged(android.content.res.Configuration) 7302 */ 7303 public void dispatchConfigurationChanged(Configuration newConfig) { 7304 onConfigurationChanged(newConfig); 7305 } 7306 7307 /** 7308 * Called when the current configuration of the resources being used 7309 * by the application have changed. You can use this to decide when 7310 * to reload resources that can changed based on orientation and other 7311 * configuration characterstics. You only need to use this if you are 7312 * not relying on the normal {@link android.app.Activity} mechanism of 7313 * recreating the activity instance upon a configuration change. 7314 * 7315 * @param newConfig The new resource configuration. 7316 */ 7317 protected void onConfigurationChanged(Configuration newConfig) { 7318 } 7319 7320 /** 7321 * Private function to aggregate all per-view attributes in to the view 7322 * root. 7323 */ 7324 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7325 performCollectViewAttributes(attachInfo, visibility); 7326 } 7327 7328 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7329 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7330 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7331 attachInfo.mKeepScreenOn = true; 7332 } 7333 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7334 ListenerInfo li = mListenerInfo; 7335 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7336 attachInfo.mHasSystemUiListeners = true; 7337 } 7338 } 7339 } 7340 7341 void needGlobalAttributesUpdate(boolean force) { 7342 final AttachInfo ai = mAttachInfo; 7343 if (ai != null) { 7344 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7345 || ai.mHasSystemUiListeners) { 7346 ai.mRecomputeGlobalAttributes = true; 7347 } 7348 } 7349 } 7350 7351 /** 7352 * Returns whether the device is currently in touch mode. Touch mode is entered 7353 * once the user begins interacting with the device by touch, and affects various 7354 * things like whether focus is always visible to the user. 7355 * 7356 * @return Whether the device is in touch mode. 7357 */ 7358 @ViewDebug.ExportedProperty 7359 public boolean isInTouchMode() { 7360 if (mAttachInfo != null) { 7361 return mAttachInfo.mInTouchMode; 7362 } else { 7363 return ViewRootImpl.isInTouchMode(); 7364 } 7365 } 7366 7367 /** 7368 * Returns the context the view is running in, through which it can 7369 * access the current theme, resources, etc. 7370 * 7371 * @return The view's Context. 7372 */ 7373 @ViewDebug.CapturedViewProperty 7374 public final Context getContext() { 7375 return mContext; 7376 } 7377 7378 /** 7379 * Handle a key event before it is processed by any input method 7380 * associated with the view hierarchy. This can be used to intercept 7381 * key events in special situations before the IME consumes them; a 7382 * typical example would be handling the BACK key to update the application's 7383 * UI instead of allowing the IME to see it and close itself. 7384 * 7385 * @param keyCode The value in event.getKeyCode(). 7386 * @param event Description of the key event. 7387 * @return If you handled the event, return true. If you want to allow the 7388 * event to be handled by the next receiver, return false. 7389 */ 7390 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7391 return false; 7392 } 7393 7394 /** 7395 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7396 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7397 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7398 * is released, if the view is enabled and clickable. 7399 * 7400 * @param keyCode A key code that represents the button pressed, from 7401 * {@link android.view.KeyEvent}. 7402 * @param event The KeyEvent object that defines the button action. 7403 */ 7404 public boolean onKeyDown(int keyCode, KeyEvent event) { 7405 boolean result = false; 7406 7407 switch (keyCode) { 7408 case KeyEvent.KEYCODE_DPAD_CENTER: 7409 case KeyEvent.KEYCODE_ENTER: { 7410 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7411 return true; 7412 } 7413 // Long clickable items don't necessarily have to be clickable 7414 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7415 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7416 (event.getRepeatCount() == 0)) { 7417 setPressed(true); 7418 checkForLongClick(0); 7419 return true; 7420 } 7421 break; 7422 } 7423 } 7424 return result; 7425 } 7426 7427 /** 7428 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7429 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7430 * the event). 7431 */ 7432 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7433 return false; 7434 } 7435 7436 /** 7437 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7438 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7439 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7440 * {@link KeyEvent#KEYCODE_ENTER} is released. 7441 * 7442 * @param keyCode A key code that represents the button pressed, from 7443 * {@link android.view.KeyEvent}. 7444 * @param event The KeyEvent object that defines the button action. 7445 */ 7446 public boolean onKeyUp(int keyCode, KeyEvent event) { 7447 boolean result = false; 7448 7449 switch (keyCode) { 7450 case KeyEvent.KEYCODE_DPAD_CENTER: 7451 case KeyEvent.KEYCODE_ENTER: { 7452 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7453 return true; 7454 } 7455 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7456 setPressed(false); 7457 7458 if (!mHasPerformedLongPress) { 7459 // This is a tap, so remove the longpress check 7460 removeLongPressCallback(); 7461 7462 result = performClick(); 7463 } 7464 } 7465 break; 7466 } 7467 } 7468 return result; 7469 } 7470 7471 /** 7472 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7473 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7474 * the event). 7475 * 7476 * @param keyCode A key code that represents the button pressed, from 7477 * {@link android.view.KeyEvent}. 7478 * @param repeatCount The number of times the action was made. 7479 * @param event The KeyEvent object that defines the button action. 7480 */ 7481 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7482 return false; 7483 } 7484 7485 /** 7486 * Called on the focused view when a key shortcut event is not handled. 7487 * Override this method to implement local key shortcuts for the View. 7488 * Key shortcuts can also be implemented by setting the 7489 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7490 * 7491 * @param keyCode The value in event.getKeyCode(). 7492 * @param event Description of the key event. 7493 * @return If you handled the event, return true. If you want to allow the 7494 * event to be handled by the next receiver, return false. 7495 */ 7496 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7497 return false; 7498 } 7499 7500 /** 7501 * Check whether the called view is a text editor, in which case it 7502 * would make sense to automatically display a soft input window for 7503 * it. Subclasses should override this if they implement 7504 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7505 * a call on that method would return a non-null InputConnection, and 7506 * they are really a first-class editor that the user would normally 7507 * start typing on when the go into a window containing your view. 7508 * 7509 * <p>The default implementation always returns false. This does 7510 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7511 * will not be called or the user can not otherwise perform edits on your 7512 * view; it is just a hint to the system that this is not the primary 7513 * purpose of this view. 7514 * 7515 * @return Returns true if this view is a text editor, else false. 7516 */ 7517 public boolean onCheckIsTextEditor() { 7518 return false; 7519 } 7520 7521 /** 7522 * Create a new InputConnection for an InputMethod to interact 7523 * with the view. The default implementation returns null, since it doesn't 7524 * support input methods. You can override this to implement such support. 7525 * This is only needed for views that take focus and text input. 7526 * 7527 * <p>When implementing this, you probably also want to implement 7528 * {@link #onCheckIsTextEditor()} to indicate you will return a 7529 * non-null InputConnection. 7530 * 7531 * @param outAttrs Fill in with attribute information about the connection. 7532 */ 7533 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7534 return null; 7535 } 7536 7537 /** 7538 * Called by the {@link android.view.inputmethod.InputMethodManager} 7539 * when a view who is not the current 7540 * input connection target is trying to make a call on the manager. The 7541 * default implementation returns false; you can override this to return 7542 * true for certain views if you are performing InputConnection proxying 7543 * to them. 7544 * @param view The View that is making the InputMethodManager call. 7545 * @return Return true to allow the call, false to reject. 7546 */ 7547 public boolean checkInputConnectionProxy(View view) { 7548 return false; 7549 } 7550 7551 /** 7552 * Show the context menu for this view. It is not safe to hold on to the 7553 * menu after returning from this method. 7554 * 7555 * You should normally not overload this method. Overload 7556 * {@link #onCreateContextMenu(ContextMenu)} or define an 7557 * {@link OnCreateContextMenuListener} to add items to the context menu. 7558 * 7559 * @param menu The context menu to populate 7560 */ 7561 public void createContextMenu(ContextMenu menu) { 7562 ContextMenuInfo menuInfo = getContextMenuInfo(); 7563 7564 // Sets the current menu info so all items added to menu will have 7565 // my extra info set. 7566 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7567 7568 onCreateContextMenu(menu); 7569 ListenerInfo li = mListenerInfo; 7570 if (li != null && li.mOnCreateContextMenuListener != null) { 7571 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7572 } 7573 7574 // Clear the extra information so subsequent items that aren't mine don't 7575 // have my extra info. 7576 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7577 7578 if (mParent != null) { 7579 mParent.createContextMenu(menu); 7580 } 7581 } 7582 7583 /** 7584 * Views should implement this if they have extra information to associate 7585 * with the context menu. The return result is supplied as a parameter to 7586 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7587 * callback. 7588 * 7589 * @return Extra information about the item for which the context menu 7590 * should be shown. This information will vary across different 7591 * subclasses of View. 7592 */ 7593 protected ContextMenuInfo getContextMenuInfo() { 7594 return null; 7595 } 7596 7597 /** 7598 * Views should implement this if the view itself is going to add items to 7599 * the context menu. 7600 * 7601 * @param menu the context menu to populate 7602 */ 7603 protected void onCreateContextMenu(ContextMenu menu) { 7604 } 7605 7606 /** 7607 * Implement this method to handle trackball motion events. The 7608 * <em>relative</em> movement of the trackball since the last event 7609 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7610 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7611 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7612 * they will often be fractional values, representing the more fine-grained 7613 * movement information available from a trackball). 7614 * 7615 * @param event The motion event. 7616 * @return True if the event was handled, false otherwise. 7617 */ 7618 public boolean onTrackballEvent(MotionEvent event) { 7619 return false; 7620 } 7621 7622 /** 7623 * Implement this method to handle generic motion events. 7624 * <p> 7625 * Generic motion events describe joystick movements, mouse hovers, track pad 7626 * touches, scroll wheel movements and other input events. The 7627 * {@link MotionEvent#getSource() source} of the motion event specifies 7628 * the class of input that was received. Implementations of this method 7629 * must examine the bits in the source before processing the event. 7630 * The following code example shows how this is done. 7631 * </p><p> 7632 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7633 * are delivered to the view under the pointer. All other generic motion events are 7634 * delivered to the focused view. 7635 * </p> 7636 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7637 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7638 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7639 * // process the joystick movement... 7640 * return true; 7641 * } 7642 * } 7643 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7644 * switch (event.getAction()) { 7645 * case MotionEvent.ACTION_HOVER_MOVE: 7646 * // process the mouse hover movement... 7647 * return true; 7648 * case MotionEvent.ACTION_SCROLL: 7649 * // process the scroll wheel movement... 7650 * return true; 7651 * } 7652 * } 7653 * return super.onGenericMotionEvent(event); 7654 * }</pre> 7655 * 7656 * @param event The generic motion event being processed. 7657 * @return True if the event was handled, false otherwise. 7658 */ 7659 public boolean onGenericMotionEvent(MotionEvent event) { 7660 return false; 7661 } 7662 7663 /** 7664 * Implement this method to handle hover events. 7665 * <p> 7666 * This method is called whenever a pointer is hovering into, over, or out of the 7667 * bounds of a view and the view is not currently being touched. 7668 * Hover events are represented as pointer events with action 7669 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7670 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7671 * </p> 7672 * <ul> 7673 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7674 * when the pointer enters the bounds of the view.</li> 7675 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7676 * when the pointer has already entered the bounds of the view and has moved.</li> 7677 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7678 * when the pointer has exited the bounds of the view or when the pointer is 7679 * about to go down due to a button click, tap, or similar user action that 7680 * causes the view to be touched.</li> 7681 * </ul> 7682 * <p> 7683 * The view should implement this method to return true to indicate that it is 7684 * handling the hover event, such as by changing its drawable state. 7685 * </p><p> 7686 * The default implementation calls {@link #setHovered} to update the hovered state 7687 * of the view when a hover enter or hover exit event is received, if the view 7688 * is enabled and is clickable. The default implementation also sends hover 7689 * accessibility events. 7690 * </p> 7691 * 7692 * @param event The motion event that describes the hover. 7693 * @return True if the view handled the hover event. 7694 * 7695 * @see #isHovered 7696 * @see #setHovered 7697 * @see #onHoverChanged 7698 */ 7699 public boolean onHoverEvent(MotionEvent event) { 7700 // The root view may receive hover (or touch) events that are outside the bounds of 7701 // the window. This code ensures that we only send accessibility events for 7702 // hovers that are actually within the bounds of the root view. 7703 final int action = event.getActionMasked(); 7704 if (!mSendingHoverAccessibilityEvents) { 7705 if ((action == MotionEvent.ACTION_HOVER_ENTER 7706 || action == MotionEvent.ACTION_HOVER_MOVE) 7707 && !hasHoveredChild() 7708 && pointInView(event.getX(), event.getY())) { 7709 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7710 mSendingHoverAccessibilityEvents = true; 7711 requestAccessibilityFocusFromHover(); 7712 } 7713 } else { 7714 if (action == MotionEvent.ACTION_HOVER_EXIT 7715 || (action == MotionEvent.ACTION_MOVE 7716 && !pointInView(event.getX(), event.getY()))) { 7717 mSendingHoverAccessibilityEvents = false; 7718 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7719 // If the window does not have input focus we take away accessibility 7720 // focus as soon as the user stop hovering over the view. 7721 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7722 getViewRootImpl().setAccessibilityFocusedHost(null); 7723 } 7724 } 7725 } 7726 7727 if (isHoverable()) { 7728 switch (action) { 7729 case MotionEvent.ACTION_HOVER_ENTER: 7730 setHovered(true); 7731 break; 7732 case MotionEvent.ACTION_HOVER_EXIT: 7733 setHovered(false); 7734 break; 7735 } 7736 7737 // Dispatch the event to onGenericMotionEvent before returning true. 7738 // This is to provide compatibility with existing applications that 7739 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7740 // break because of the new default handling for hoverable views 7741 // in onHoverEvent. 7742 // Note that onGenericMotionEvent will be called by default when 7743 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7744 dispatchGenericMotionEventInternal(event); 7745 return true; 7746 } 7747 7748 return false; 7749 } 7750 7751 /** 7752 * Returns true if the view should handle {@link #onHoverEvent} 7753 * by calling {@link #setHovered} to change its hovered state. 7754 * 7755 * @return True if the view is hoverable. 7756 */ 7757 private boolean isHoverable() { 7758 final int viewFlags = mViewFlags; 7759 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7760 return false; 7761 } 7762 7763 return (viewFlags & CLICKABLE) == CLICKABLE 7764 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7765 } 7766 7767 /** 7768 * Returns true if the view is currently hovered. 7769 * 7770 * @return True if the view is currently hovered. 7771 * 7772 * @see #setHovered 7773 * @see #onHoverChanged 7774 */ 7775 @ViewDebug.ExportedProperty 7776 public boolean isHovered() { 7777 return (mPrivateFlags & HOVERED) != 0; 7778 } 7779 7780 /** 7781 * Sets whether the view is currently hovered. 7782 * <p> 7783 * Calling this method also changes the drawable state of the view. This 7784 * enables the view to react to hover by using different drawable resources 7785 * to change its appearance. 7786 * </p><p> 7787 * The {@link #onHoverChanged} method is called when the hovered state changes. 7788 * </p> 7789 * 7790 * @param hovered True if the view is hovered. 7791 * 7792 * @see #isHovered 7793 * @see #onHoverChanged 7794 */ 7795 public void setHovered(boolean hovered) { 7796 if (hovered) { 7797 if ((mPrivateFlags & HOVERED) == 0) { 7798 mPrivateFlags |= HOVERED; 7799 refreshDrawableState(); 7800 onHoverChanged(true); 7801 } 7802 } else { 7803 if ((mPrivateFlags & HOVERED) != 0) { 7804 mPrivateFlags &= ~HOVERED; 7805 refreshDrawableState(); 7806 onHoverChanged(false); 7807 } 7808 } 7809 } 7810 7811 /** 7812 * Implement this method to handle hover state changes. 7813 * <p> 7814 * This method is called whenever the hover state changes as a result of a 7815 * call to {@link #setHovered}. 7816 * </p> 7817 * 7818 * @param hovered The current hover state, as returned by {@link #isHovered}. 7819 * 7820 * @see #isHovered 7821 * @see #setHovered 7822 */ 7823 public void onHoverChanged(boolean hovered) { 7824 } 7825 7826 /** 7827 * Implement this method to handle touch screen motion events. 7828 * 7829 * @param event The motion event. 7830 * @return True if the event was handled, false otherwise. 7831 */ 7832 public boolean onTouchEvent(MotionEvent event) { 7833 final int viewFlags = mViewFlags; 7834 7835 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7836 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7837 setPressed(false); 7838 } 7839 // A disabled view that is clickable still consumes the touch 7840 // events, it just doesn't respond to them. 7841 return (((viewFlags & CLICKABLE) == CLICKABLE || 7842 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7843 } 7844 7845 if (mTouchDelegate != null) { 7846 if (mTouchDelegate.onTouchEvent(event)) { 7847 return true; 7848 } 7849 } 7850 7851 if (((viewFlags & CLICKABLE) == CLICKABLE || 7852 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7853 switch (event.getAction()) { 7854 case MotionEvent.ACTION_UP: 7855 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7856 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7857 // take focus if we don't have it already and we should in 7858 // touch mode. 7859 boolean focusTaken = false; 7860 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7861 focusTaken = requestFocus(); 7862 } 7863 7864 if (prepressed) { 7865 // The button is being released before we actually 7866 // showed it as pressed. Make it show the pressed 7867 // state now (before scheduling the click) to ensure 7868 // the user sees it. 7869 setPressed(true); 7870 } 7871 7872 if (!mHasPerformedLongPress) { 7873 // This is a tap, so remove the longpress check 7874 removeLongPressCallback(); 7875 7876 // Only perform take click actions if we were in the pressed state 7877 if (!focusTaken) { 7878 // Use a Runnable and post this rather than calling 7879 // performClick directly. This lets other visual state 7880 // of the view update before click actions start. 7881 if (mPerformClick == null) { 7882 mPerformClick = new PerformClick(); 7883 } 7884 if (!post(mPerformClick)) { 7885 performClick(); 7886 } 7887 } 7888 } 7889 7890 if (mUnsetPressedState == null) { 7891 mUnsetPressedState = new UnsetPressedState(); 7892 } 7893 7894 if (prepressed) { 7895 postDelayed(mUnsetPressedState, 7896 ViewConfiguration.getPressedStateDuration()); 7897 } else if (!post(mUnsetPressedState)) { 7898 // If the post failed, unpress right now 7899 mUnsetPressedState.run(); 7900 } 7901 removeTapCallback(); 7902 } 7903 break; 7904 7905 case MotionEvent.ACTION_DOWN: 7906 mHasPerformedLongPress = false; 7907 7908 if (performButtonActionOnTouchDown(event)) { 7909 break; 7910 } 7911 7912 // Walk up the hierarchy to determine if we're inside a scrolling container. 7913 boolean isInScrollingContainer = isInScrollingContainer(); 7914 7915 // For views inside a scrolling container, delay the pressed feedback for 7916 // a short period in case this is a scroll. 7917 if (isInScrollingContainer) { 7918 mPrivateFlags |= PREPRESSED; 7919 if (mPendingCheckForTap == null) { 7920 mPendingCheckForTap = new CheckForTap(); 7921 } 7922 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7923 } else { 7924 // Not inside a scrolling container, so show the feedback right away 7925 setPressed(true); 7926 checkForLongClick(0); 7927 } 7928 break; 7929 7930 case MotionEvent.ACTION_CANCEL: 7931 setPressed(false); 7932 removeTapCallback(); 7933 break; 7934 7935 case MotionEvent.ACTION_MOVE: 7936 final int x = (int) event.getX(); 7937 final int y = (int) event.getY(); 7938 7939 // Be lenient about moving outside of buttons 7940 if (!pointInView(x, y, mTouchSlop)) { 7941 // Outside button 7942 removeTapCallback(); 7943 if ((mPrivateFlags & PRESSED) != 0) { 7944 // Remove any future long press/tap checks 7945 removeLongPressCallback(); 7946 7947 setPressed(false); 7948 } 7949 } 7950 break; 7951 } 7952 return true; 7953 } 7954 7955 return false; 7956 } 7957 7958 /** 7959 * @hide 7960 */ 7961 public boolean isInScrollingContainer() { 7962 ViewParent p = getParent(); 7963 while (p != null && p instanceof ViewGroup) { 7964 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7965 return true; 7966 } 7967 p = p.getParent(); 7968 } 7969 return false; 7970 } 7971 7972 /** 7973 * Remove the longpress detection timer. 7974 */ 7975 private void removeLongPressCallback() { 7976 if (mPendingCheckForLongPress != null) { 7977 removeCallbacks(mPendingCheckForLongPress); 7978 } 7979 } 7980 7981 /** 7982 * Remove the pending click action 7983 */ 7984 private void removePerformClickCallback() { 7985 if (mPerformClick != null) { 7986 removeCallbacks(mPerformClick); 7987 } 7988 } 7989 7990 /** 7991 * Remove the prepress detection timer. 7992 */ 7993 private void removeUnsetPressCallback() { 7994 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7995 setPressed(false); 7996 removeCallbacks(mUnsetPressedState); 7997 } 7998 } 7999 8000 /** 8001 * Remove the tap detection timer. 8002 */ 8003 private void removeTapCallback() { 8004 if (mPendingCheckForTap != null) { 8005 mPrivateFlags &= ~PREPRESSED; 8006 removeCallbacks(mPendingCheckForTap); 8007 } 8008 } 8009 8010 /** 8011 * Cancels a pending long press. Your subclass can use this if you 8012 * want the context menu to come up if the user presses and holds 8013 * at the same place, but you don't want it to come up if they press 8014 * and then move around enough to cause scrolling. 8015 */ 8016 public void cancelLongPress() { 8017 removeLongPressCallback(); 8018 8019 /* 8020 * The prepressed state handled by the tap callback is a display 8021 * construct, but the tap callback will post a long press callback 8022 * less its own timeout. Remove it here. 8023 */ 8024 removeTapCallback(); 8025 } 8026 8027 /** 8028 * Remove the pending callback for sending a 8029 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 8030 */ 8031 private void removeSendViewScrolledAccessibilityEventCallback() { 8032 if (mSendViewScrolledAccessibilityEvent != null) { 8033 removeCallbacks(mSendViewScrolledAccessibilityEvent); 8034 } 8035 } 8036 8037 /** 8038 * Sets the TouchDelegate for this View. 8039 */ 8040 public void setTouchDelegate(TouchDelegate delegate) { 8041 mTouchDelegate = delegate; 8042 } 8043 8044 /** 8045 * Gets the TouchDelegate for this View. 8046 */ 8047 public TouchDelegate getTouchDelegate() { 8048 return mTouchDelegate; 8049 } 8050 8051 /** 8052 * Set flags controlling behavior of this view. 8053 * 8054 * @param flags Constant indicating the value which should be set 8055 * @param mask Constant indicating the bit range that should be changed 8056 */ 8057 void setFlags(int flags, int mask) { 8058 int old = mViewFlags; 8059 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 8060 8061 int changed = mViewFlags ^ old; 8062 if (changed == 0) { 8063 return; 8064 } 8065 int privateFlags = mPrivateFlags; 8066 8067 /* Check if the FOCUSABLE bit has changed */ 8068 if (((changed & FOCUSABLE_MASK) != 0) && 8069 ((privateFlags & HAS_BOUNDS) !=0)) { 8070 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 8071 && ((privateFlags & FOCUSED) != 0)) { 8072 /* Give up focus if we are no longer focusable */ 8073 clearFocus(); 8074 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 8075 && ((privateFlags & FOCUSED) == 0)) { 8076 /* 8077 * Tell the view system that we are now available to take focus 8078 * if no one else already has it. 8079 */ 8080 if (mParent != null) mParent.focusableViewAvailable(this); 8081 } 8082 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8083 notifyAccessibilityStateChanged(); 8084 } 8085 } 8086 8087 if ((flags & VISIBILITY_MASK) == VISIBLE) { 8088 if ((changed & VISIBILITY_MASK) != 0) { 8089 /* 8090 * If this view is becoming visible, invalidate it in case it changed while 8091 * it was not visible. Marking it drawn ensures that the invalidation will 8092 * go through. 8093 */ 8094 mPrivateFlags |= DRAWN; 8095 invalidate(true); 8096 8097 needGlobalAttributesUpdate(true); 8098 8099 // a view becoming visible is worth notifying the parent 8100 // about in case nothing has focus. even if this specific view 8101 // isn't focusable, it may contain something that is, so let 8102 // the root view try to give this focus if nothing else does. 8103 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 8104 mParent.focusableViewAvailable(this); 8105 } 8106 } 8107 } 8108 8109 /* Check if the GONE bit has changed */ 8110 if ((changed & GONE) != 0) { 8111 needGlobalAttributesUpdate(false); 8112 requestLayout(); 8113 8114 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 8115 if (hasFocus()) clearFocus(); 8116 clearAccessibilityFocus(); 8117 destroyDrawingCache(); 8118 if (mParent instanceof View) { 8119 // GONE views noop invalidation, so invalidate the parent 8120 ((View) mParent).invalidate(true); 8121 } 8122 // Mark the view drawn to ensure that it gets invalidated properly the next 8123 // time it is visible and gets invalidated 8124 mPrivateFlags |= DRAWN; 8125 } 8126 if (mAttachInfo != null) { 8127 mAttachInfo.mViewVisibilityChanged = true; 8128 } 8129 } 8130 8131 /* Check if the VISIBLE bit has changed */ 8132 if ((changed & INVISIBLE) != 0) { 8133 needGlobalAttributesUpdate(false); 8134 /* 8135 * If this view is becoming invisible, set the DRAWN flag so that 8136 * the next invalidate() will not be skipped. 8137 */ 8138 mPrivateFlags |= DRAWN; 8139 8140 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 8141 // root view becoming invisible shouldn't clear focus and accessibility focus 8142 if (getRootView() != this) { 8143 clearFocus(); 8144 clearAccessibilityFocus(); 8145 } 8146 } 8147 if (mAttachInfo != null) { 8148 mAttachInfo.mViewVisibilityChanged = true; 8149 } 8150 } 8151 8152 if ((changed & VISIBILITY_MASK) != 0) { 8153 if (mParent instanceof ViewGroup) { 8154 ((ViewGroup) mParent).onChildVisibilityChanged(this, 8155 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 8156 ((View) mParent).invalidate(true); 8157 } else if (mParent != null) { 8158 mParent.invalidateChild(this, null); 8159 } 8160 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 8161 } 8162 8163 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 8164 destroyDrawingCache(); 8165 } 8166 8167 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 8168 destroyDrawingCache(); 8169 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8170 invalidateParentCaches(); 8171 } 8172 8173 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 8174 destroyDrawingCache(); 8175 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8176 } 8177 8178 if ((changed & DRAW_MASK) != 0) { 8179 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 8180 if (mBackground != null) { 8181 mPrivateFlags &= ~SKIP_DRAW; 8182 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8183 } else { 8184 mPrivateFlags |= SKIP_DRAW; 8185 } 8186 } else { 8187 mPrivateFlags &= ~SKIP_DRAW; 8188 } 8189 requestLayout(); 8190 invalidate(true); 8191 } 8192 8193 if ((changed & KEEP_SCREEN_ON) != 0) { 8194 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 8195 mParent.recomputeViewAttributes(this); 8196 } 8197 } 8198 8199 if (AccessibilityManager.getInstance(mContext).isEnabled() 8200 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 8201 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 8202 notifyAccessibilityStateChanged(); 8203 } 8204 } 8205 8206 /** 8207 * Change the view's z order in the tree, so it's on top of other sibling 8208 * views 8209 */ 8210 public void bringToFront() { 8211 if (mParent != null) { 8212 mParent.bringChildToFront(this); 8213 } 8214 } 8215 8216 /** 8217 * This is called in response to an internal scroll in this view (i.e., the 8218 * view scrolled its own contents). This is typically as a result of 8219 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 8220 * called. 8221 * 8222 * @param l Current horizontal scroll origin. 8223 * @param t Current vertical scroll origin. 8224 * @param oldl Previous horizontal scroll origin. 8225 * @param oldt Previous vertical scroll origin. 8226 */ 8227 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 8228 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 8229 postSendViewScrolledAccessibilityEventCallback(); 8230 } 8231 8232 mBackgroundSizeChanged = true; 8233 8234 final AttachInfo ai = mAttachInfo; 8235 if (ai != null) { 8236 ai.mViewScrollChanged = true; 8237 } 8238 } 8239 8240 /** 8241 * Interface definition for a callback to be invoked when the layout bounds of a view 8242 * changes due to layout processing. 8243 */ 8244 public interface OnLayoutChangeListener { 8245 /** 8246 * Called when the focus state of a view has changed. 8247 * 8248 * @param v The view whose state has changed. 8249 * @param left The new value of the view's left property. 8250 * @param top The new value of the view's top property. 8251 * @param right The new value of the view's right property. 8252 * @param bottom The new value of the view's bottom property. 8253 * @param oldLeft The previous value of the view's left property. 8254 * @param oldTop The previous value of the view's top property. 8255 * @param oldRight The previous value of the view's right property. 8256 * @param oldBottom The previous value of the view's bottom property. 8257 */ 8258 void onLayoutChange(View v, int left, int top, int right, int bottom, 8259 int oldLeft, int oldTop, int oldRight, int oldBottom); 8260 } 8261 8262 /** 8263 * This is called during layout when the size of this view has changed. If 8264 * you were just added to the view hierarchy, you're called with the old 8265 * values of 0. 8266 * 8267 * @param w Current width of this view. 8268 * @param h Current height of this view. 8269 * @param oldw Old width of this view. 8270 * @param oldh Old height of this view. 8271 */ 8272 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 8273 } 8274 8275 /** 8276 * Called by draw to draw the child views. This may be overridden 8277 * by derived classes to gain control just before its children are drawn 8278 * (but after its own view has been drawn). 8279 * @param canvas the canvas on which to draw the view 8280 */ 8281 protected void dispatchDraw(Canvas canvas) { 8282 8283 } 8284 8285 /** 8286 * Gets the parent of this view. Note that the parent is a 8287 * ViewParent and not necessarily a View. 8288 * 8289 * @return Parent of this view. 8290 */ 8291 public final ViewParent getParent() { 8292 return mParent; 8293 } 8294 8295 /** 8296 * Set the horizontal scrolled position of your view. This will cause a call to 8297 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8298 * invalidated. 8299 * @param value the x position to scroll to 8300 */ 8301 public void setScrollX(int value) { 8302 scrollTo(value, mScrollY); 8303 } 8304 8305 /** 8306 * Set the vertical scrolled position of your view. This will cause a call to 8307 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8308 * invalidated. 8309 * @param value the y position to scroll to 8310 */ 8311 public void setScrollY(int value) { 8312 scrollTo(mScrollX, value); 8313 } 8314 8315 /** 8316 * Return the scrolled left position of this view. This is the left edge of 8317 * the displayed part of your view. You do not need to draw any pixels 8318 * farther left, since those are outside of the frame of your view on 8319 * screen. 8320 * 8321 * @return The left edge of the displayed part of your view, in pixels. 8322 */ 8323 public final int getScrollX() { 8324 return mScrollX; 8325 } 8326 8327 /** 8328 * Return the scrolled top position of this view. This is the top edge of 8329 * the displayed part of your view. You do not need to draw any pixels above 8330 * it, since those are outside of the frame of your view on screen. 8331 * 8332 * @return The top edge of the displayed part of your view, in pixels. 8333 */ 8334 public final int getScrollY() { 8335 return mScrollY; 8336 } 8337 8338 /** 8339 * Return the width of the your view. 8340 * 8341 * @return The width of your view, in pixels. 8342 */ 8343 @ViewDebug.ExportedProperty(category = "layout") 8344 public final int getWidth() { 8345 return mRight - mLeft; 8346 } 8347 8348 /** 8349 * Return the height of your view. 8350 * 8351 * @return The height of your view, in pixels. 8352 */ 8353 @ViewDebug.ExportedProperty(category = "layout") 8354 public final int getHeight() { 8355 return mBottom - mTop; 8356 } 8357 8358 /** 8359 * Return the visible drawing bounds of your view. Fills in the output 8360 * rectangle with the values from getScrollX(), getScrollY(), 8361 * getWidth(), and getHeight(). 8362 * 8363 * @param outRect The (scrolled) drawing bounds of the view. 8364 */ 8365 public void getDrawingRect(Rect outRect) { 8366 outRect.left = mScrollX; 8367 outRect.top = mScrollY; 8368 outRect.right = mScrollX + (mRight - mLeft); 8369 outRect.bottom = mScrollY + (mBottom - mTop); 8370 } 8371 8372 /** 8373 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8374 * raw width component (that is the result is masked by 8375 * {@link #MEASURED_SIZE_MASK}). 8376 * 8377 * @return The raw measured width of this view. 8378 */ 8379 public final int getMeasuredWidth() { 8380 return mMeasuredWidth & MEASURED_SIZE_MASK; 8381 } 8382 8383 /** 8384 * Return the full width measurement information for this view as computed 8385 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8386 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8387 * This should be used during measurement and layout calculations only. Use 8388 * {@link #getWidth()} to see how wide a view is after layout. 8389 * 8390 * @return The measured width of this view as a bit mask. 8391 */ 8392 public final int getMeasuredWidthAndState() { 8393 return mMeasuredWidth; 8394 } 8395 8396 /** 8397 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8398 * raw width component (that is the result is masked by 8399 * {@link #MEASURED_SIZE_MASK}). 8400 * 8401 * @return The raw measured height of this view. 8402 */ 8403 public final int getMeasuredHeight() { 8404 return mMeasuredHeight & MEASURED_SIZE_MASK; 8405 } 8406 8407 /** 8408 * Return the full height measurement information for this view as computed 8409 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8410 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8411 * This should be used during measurement and layout calculations only. Use 8412 * {@link #getHeight()} to see how wide a view is after layout. 8413 * 8414 * @return The measured width of this view as a bit mask. 8415 */ 8416 public final int getMeasuredHeightAndState() { 8417 return mMeasuredHeight; 8418 } 8419 8420 /** 8421 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8422 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8423 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8424 * and the height component is at the shifted bits 8425 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8426 */ 8427 public final int getMeasuredState() { 8428 return (mMeasuredWidth&MEASURED_STATE_MASK) 8429 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8430 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8431 } 8432 8433 /** 8434 * The transform matrix of this view, which is calculated based on the current 8435 * roation, scale, and pivot properties. 8436 * 8437 * @see #getRotation() 8438 * @see #getScaleX() 8439 * @see #getScaleY() 8440 * @see #getPivotX() 8441 * @see #getPivotY() 8442 * @return The current transform matrix for the view 8443 */ 8444 public Matrix getMatrix() { 8445 if (mTransformationInfo != null) { 8446 updateMatrix(); 8447 return mTransformationInfo.mMatrix; 8448 } 8449 return Matrix.IDENTITY_MATRIX; 8450 } 8451 8452 /** 8453 * Utility function to determine if the value is far enough away from zero to be 8454 * considered non-zero. 8455 * @param value A floating point value to check for zero-ness 8456 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8457 */ 8458 private static boolean nonzero(float value) { 8459 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8460 } 8461 8462 /** 8463 * Returns true if the transform matrix is the identity matrix. 8464 * Recomputes the matrix if necessary. 8465 * 8466 * @return True if the transform matrix is the identity matrix, false otherwise. 8467 */ 8468 final boolean hasIdentityMatrix() { 8469 if (mTransformationInfo != null) { 8470 updateMatrix(); 8471 return mTransformationInfo.mMatrixIsIdentity; 8472 } 8473 return true; 8474 } 8475 8476 void ensureTransformationInfo() { 8477 if (mTransformationInfo == null) { 8478 mTransformationInfo = new TransformationInfo(); 8479 } 8480 } 8481 8482 /** 8483 * Recomputes the transform matrix if necessary. 8484 */ 8485 private void updateMatrix() { 8486 final TransformationInfo info = mTransformationInfo; 8487 if (info == null) { 8488 return; 8489 } 8490 if (info.mMatrixDirty) { 8491 // transform-related properties have changed since the last time someone 8492 // asked for the matrix; recalculate it with the current values 8493 8494 // Figure out if we need to update the pivot point 8495 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8496 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8497 info.mPrevWidth = mRight - mLeft; 8498 info.mPrevHeight = mBottom - mTop; 8499 info.mPivotX = info.mPrevWidth / 2f; 8500 info.mPivotY = info.mPrevHeight / 2f; 8501 } 8502 } 8503 info.mMatrix.reset(); 8504 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8505 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8506 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8507 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8508 } else { 8509 if (info.mCamera == null) { 8510 info.mCamera = new Camera(); 8511 info.matrix3D = new Matrix(); 8512 } 8513 info.mCamera.save(); 8514 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8515 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8516 info.mCamera.getMatrix(info.matrix3D); 8517 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8518 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8519 info.mPivotY + info.mTranslationY); 8520 info.mMatrix.postConcat(info.matrix3D); 8521 info.mCamera.restore(); 8522 } 8523 info.mMatrixDirty = false; 8524 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8525 info.mInverseMatrixDirty = true; 8526 } 8527 } 8528 8529 /** 8530 * Utility method to retrieve the inverse of the current mMatrix property. 8531 * We cache the matrix to avoid recalculating it when transform properties 8532 * have not changed. 8533 * 8534 * @return The inverse of the current matrix of this view. 8535 */ 8536 final Matrix getInverseMatrix() { 8537 final TransformationInfo info = mTransformationInfo; 8538 if (info != null) { 8539 updateMatrix(); 8540 if (info.mInverseMatrixDirty) { 8541 if (info.mInverseMatrix == null) { 8542 info.mInverseMatrix = new Matrix(); 8543 } 8544 info.mMatrix.invert(info.mInverseMatrix); 8545 info.mInverseMatrixDirty = false; 8546 } 8547 return info.mInverseMatrix; 8548 } 8549 return Matrix.IDENTITY_MATRIX; 8550 } 8551 8552 /** 8553 * Gets the distance along the Z axis from the camera to this view. 8554 * 8555 * @see #setCameraDistance(float) 8556 * 8557 * @return The distance along the Z axis. 8558 */ 8559 public float getCameraDistance() { 8560 ensureTransformationInfo(); 8561 final float dpi = mResources.getDisplayMetrics().densityDpi; 8562 final TransformationInfo info = mTransformationInfo; 8563 if (info.mCamera == null) { 8564 info.mCamera = new Camera(); 8565 info.matrix3D = new Matrix(); 8566 } 8567 return -(info.mCamera.getLocationZ() * dpi); 8568 } 8569 8570 /** 8571 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8572 * views are drawn) from the camera to this view. The camera's distance 8573 * affects 3D transformations, for instance rotations around the X and Y 8574 * axis. If the rotationX or rotationY properties are changed and this view is 8575 * large (more than half the size of the screen), it is recommended to always 8576 * use a camera distance that's greater than the height (X axis rotation) or 8577 * the width (Y axis rotation) of this view.</p> 8578 * 8579 * <p>The distance of the camera from the view plane can have an affect on the 8580 * perspective distortion of the view when it is rotated around the x or y axis. 8581 * For example, a large distance will result in a large viewing angle, and there 8582 * will not be much perspective distortion of the view as it rotates. A short 8583 * distance may cause much more perspective distortion upon rotation, and can 8584 * also result in some drawing artifacts if the rotated view ends up partially 8585 * behind the camera (which is why the recommendation is to use a distance at 8586 * least as far as the size of the view, if the view is to be rotated.)</p> 8587 * 8588 * <p>The distance is expressed in "depth pixels." The default distance depends 8589 * on the screen density. For instance, on a medium density display, the 8590 * default distance is 1280. On a high density display, the default distance 8591 * is 1920.</p> 8592 * 8593 * <p>If you want to specify a distance that leads to visually consistent 8594 * results across various densities, use the following formula:</p> 8595 * <pre> 8596 * float scale = context.getResources().getDisplayMetrics().density; 8597 * view.setCameraDistance(distance * scale); 8598 * </pre> 8599 * 8600 * <p>The density scale factor of a high density display is 1.5, 8601 * and 1920 = 1280 * 1.5.</p> 8602 * 8603 * @param distance The distance in "depth pixels", if negative the opposite 8604 * value is used 8605 * 8606 * @see #setRotationX(float) 8607 * @see #setRotationY(float) 8608 */ 8609 public void setCameraDistance(float distance) { 8610 invalidateViewProperty(true, false); 8611 8612 ensureTransformationInfo(); 8613 final float dpi = mResources.getDisplayMetrics().densityDpi; 8614 final TransformationInfo info = mTransformationInfo; 8615 if (info.mCamera == null) { 8616 info.mCamera = new Camera(); 8617 info.matrix3D = new Matrix(); 8618 } 8619 8620 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8621 info.mMatrixDirty = true; 8622 8623 invalidateViewProperty(false, false); 8624 if (mDisplayList != null) { 8625 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8626 } 8627 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8628 // View was rejected last time it was drawn by its parent; this may have changed 8629 invalidateParentIfNeeded(); 8630 } 8631 } 8632 8633 /** 8634 * The degrees that the view is rotated around the pivot point. 8635 * 8636 * @see #setRotation(float) 8637 * @see #getPivotX() 8638 * @see #getPivotY() 8639 * 8640 * @return The degrees of rotation. 8641 */ 8642 @ViewDebug.ExportedProperty(category = "drawing") 8643 public float getRotation() { 8644 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8645 } 8646 8647 /** 8648 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8649 * result in clockwise rotation. 8650 * 8651 * @param rotation The degrees of rotation. 8652 * 8653 * @see #getRotation() 8654 * @see #getPivotX() 8655 * @see #getPivotY() 8656 * @see #setRotationX(float) 8657 * @see #setRotationY(float) 8658 * 8659 * @attr ref android.R.styleable#View_rotation 8660 */ 8661 public void setRotation(float rotation) { 8662 ensureTransformationInfo(); 8663 final TransformationInfo info = mTransformationInfo; 8664 if (info.mRotation != rotation) { 8665 // Double-invalidation is necessary to capture view's old and new areas 8666 invalidateViewProperty(true, false); 8667 info.mRotation = rotation; 8668 info.mMatrixDirty = true; 8669 invalidateViewProperty(false, true); 8670 if (mDisplayList != null) { 8671 mDisplayList.setRotation(rotation); 8672 } 8673 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8674 // View was rejected last time it was drawn by its parent; this may have changed 8675 invalidateParentIfNeeded(); 8676 } 8677 } 8678 } 8679 8680 /** 8681 * The degrees that the view is rotated around the vertical axis through the pivot point. 8682 * 8683 * @see #getPivotX() 8684 * @see #getPivotY() 8685 * @see #setRotationY(float) 8686 * 8687 * @return The degrees of Y rotation. 8688 */ 8689 @ViewDebug.ExportedProperty(category = "drawing") 8690 public float getRotationY() { 8691 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8692 } 8693 8694 /** 8695 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8696 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8697 * down the y axis. 8698 * 8699 * When rotating large views, it is recommended to adjust the camera distance 8700 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8701 * 8702 * @param rotationY The degrees of Y rotation. 8703 * 8704 * @see #getRotationY() 8705 * @see #getPivotX() 8706 * @see #getPivotY() 8707 * @see #setRotation(float) 8708 * @see #setRotationX(float) 8709 * @see #setCameraDistance(float) 8710 * 8711 * @attr ref android.R.styleable#View_rotationY 8712 */ 8713 public void setRotationY(float rotationY) { 8714 ensureTransformationInfo(); 8715 final TransformationInfo info = mTransformationInfo; 8716 if (info.mRotationY != rotationY) { 8717 invalidateViewProperty(true, false); 8718 info.mRotationY = rotationY; 8719 info.mMatrixDirty = true; 8720 invalidateViewProperty(false, true); 8721 if (mDisplayList != null) { 8722 mDisplayList.setRotationY(rotationY); 8723 } 8724 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8725 // View was rejected last time it was drawn by its parent; this may have changed 8726 invalidateParentIfNeeded(); 8727 } 8728 } 8729 } 8730 8731 /** 8732 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8733 * 8734 * @see #getPivotX() 8735 * @see #getPivotY() 8736 * @see #setRotationX(float) 8737 * 8738 * @return The degrees of X rotation. 8739 */ 8740 @ViewDebug.ExportedProperty(category = "drawing") 8741 public float getRotationX() { 8742 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8743 } 8744 8745 /** 8746 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8747 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8748 * x axis. 8749 * 8750 * When rotating large views, it is recommended to adjust the camera distance 8751 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8752 * 8753 * @param rotationX The degrees of X rotation. 8754 * 8755 * @see #getRotationX() 8756 * @see #getPivotX() 8757 * @see #getPivotY() 8758 * @see #setRotation(float) 8759 * @see #setRotationY(float) 8760 * @see #setCameraDistance(float) 8761 * 8762 * @attr ref android.R.styleable#View_rotationX 8763 */ 8764 public void setRotationX(float rotationX) { 8765 ensureTransformationInfo(); 8766 final TransformationInfo info = mTransformationInfo; 8767 if (info.mRotationX != rotationX) { 8768 invalidateViewProperty(true, false); 8769 info.mRotationX = rotationX; 8770 info.mMatrixDirty = true; 8771 invalidateViewProperty(false, true); 8772 if (mDisplayList != null) { 8773 mDisplayList.setRotationX(rotationX); 8774 } 8775 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8776 // View was rejected last time it was drawn by its parent; this may have changed 8777 invalidateParentIfNeeded(); 8778 } 8779 } 8780 } 8781 8782 /** 8783 * The amount that the view is scaled in x around the pivot point, as a proportion of 8784 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8785 * 8786 * <p>By default, this is 1.0f. 8787 * 8788 * @see #getPivotX() 8789 * @see #getPivotY() 8790 * @return The scaling factor. 8791 */ 8792 @ViewDebug.ExportedProperty(category = "drawing") 8793 public float getScaleX() { 8794 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8795 } 8796 8797 /** 8798 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8799 * the view's unscaled width. A value of 1 means that no scaling is applied. 8800 * 8801 * @param scaleX The scaling factor. 8802 * @see #getPivotX() 8803 * @see #getPivotY() 8804 * 8805 * @attr ref android.R.styleable#View_scaleX 8806 */ 8807 public void setScaleX(float scaleX) { 8808 ensureTransformationInfo(); 8809 final TransformationInfo info = mTransformationInfo; 8810 if (info.mScaleX != scaleX) { 8811 invalidateViewProperty(true, false); 8812 info.mScaleX = scaleX; 8813 info.mMatrixDirty = true; 8814 invalidateViewProperty(false, true); 8815 if (mDisplayList != null) { 8816 mDisplayList.setScaleX(scaleX); 8817 } 8818 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8819 // View was rejected last time it was drawn by its parent; this may have changed 8820 invalidateParentIfNeeded(); 8821 } 8822 } 8823 } 8824 8825 /** 8826 * The amount that the view is scaled in y around the pivot point, as a proportion of 8827 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8828 * 8829 * <p>By default, this is 1.0f. 8830 * 8831 * @see #getPivotX() 8832 * @see #getPivotY() 8833 * @return The scaling factor. 8834 */ 8835 @ViewDebug.ExportedProperty(category = "drawing") 8836 public float getScaleY() { 8837 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8838 } 8839 8840 /** 8841 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8842 * the view's unscaled width. A value of 1 means that no scaling is applied. 8843 * 8844 * @param scaleY The scaling factor. 8845 * @see #getPivotX() 8846 * @see #getPivotY() 8847 * 8848 * @attr ref android.R.styleable#View_scaleY 8849 */ 8850 public void setScaleY(float scaleY) { 8851 ensureTransformationInfo(); 8852 final TransformationInfo info = mTransformationInfo; 8853 if (info.mScaleY != scaleY) { 8854 invalidateViewProperty(true, false); 8855 info.mScaleY = scaleY; 8856 info.mMatrixDirty = true; 8857 invalidateViewProperty(false, true); 8858 if (mDisplayList != null) { 8859 mDisplayList.setScaleY(scaleY); 8860 } 8861 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8862 // View was rejected last time it was drawn by its parent; this may have changed 8863 invalidateParentIfNeeded(); 8864 } 8865 } 8866 } 8867 8868 /** 8869 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8870 * and {@link #setScaleX(float) scaled}. 8871 * 8872 * @see #getRotation() 8873 * @see #getScaleX() 8874 * @see #getScaleY() 8875 * @see #getPivotY() 8876 * @return The x location of the pivot point. 8877 * 8878 * @attr ref android.R.styleable#View_transformPivotX 8879 */ 8880 @ViewDebug.ExportedProperty(category = "drawing") 8881 public float getPivotX() { 8882 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8883 } 8884 8885 /** 8886 * Sets the x location of the point around which the view is 8887 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8888 * By default, the pivot point is centered on the object. 8889 * Setting this property disables this behavior and causes the view to use only the 8890 * explicitly set pivotX and pivotY values. 8891 * 8892 * @param pivotX The x location of the pivot point. 8893 * @see #getRotation() 8894 * @see #getScaleX() 8895 * @see #getScaleY() 8896 * @see #getPivotY() 8897 * 8898 * @attr ref android.R.styleable#View_transformPivotX 8899 */ 8900 public void setPivotX(float pivotX) { 8901 ensureTransformationInfo(); 8902 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8903 final TransformationInfo info = mTransformationInfo; 8904 if (info.mPivotX != pivotX) { 8905 invalidateViewProperty(true, false); 8906 info.mPivotX = pivotX; 8907 info.mMatrixDirty = true; 8908 invalidateViewProperty(false, true); 8909 if (mDisplayList != null) { 8910 mDisplayList.setPivotX(pivotX); 8911 } 8912 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8913 // View was rejected last time it was drawn by its parent; this may have changed 8914 invalidateParentIfNeeded(); 8915 } 8916 } 8917 } 8918 8919 /** 8920 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8921 * and {@link #setScaleY(float) scaled}. 8922 * 8923 * @see #getRotation() 8924 * @see #getScaleX() 8925 * @see #getScaleY() 8926 * @see #getPivotY() 8927 * @return The y location of the pivot point. 8928 * 8929 * @attr ref android.R.styleable#View_transformPivotY 8930 */ 8931 @ViewDebug.ExportedProperty(category = "drawing") 8932 public float getPivotY() { 8933 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8934 } 8935 8936 /** 8937 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8938 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8939 * Setting this property disables this behavior and causes the view to use only the 8940 * explicitly set pivotX and pivotY values. 8941 * 8942 * @param pivotY The y location of the pivot point. 8943 * @see #getRotation() 8944 * @see #getScaleX() 8945 * @see #getScaleY() 8946 * @see #getPivotY() 8947 * 8948 * @attr ref android.R.styleable#View_transformPivotY 8949 */ 8950 public void setPivotY(float pivotY) { 8951 ensureTransformationInfo(); 8952 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8953 final TransformationInfo info = mTransformationInfo; 8954 if (info.mPivotY != pivotY) { 8955 invalidateViewProperty(true, false); 8956 info.mPivotY = pivotY; 8957 info.mMatrixDirty = true; 8958 invalidateViewProperty(false, true); 8959 if (mDisplayList != null) { 8960 mDisplayList.setPivotY(pivotY); 8961 } 8962 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 8963 // View was rejected last time it was drawn by its parent; this may have changed 8964 invalidateParentIfNeeded(); 8965 } 8966 } 8967 } 8968 8969 /** 8970 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8971 * completely transparent and 1 means the view is completely opaque. 8972 * 8973 * <p>By default this is 1.0f. 8974 * @return The opacity of the view. 8975 */ 8976 @ViewDebug.ExportedProperty(category = "drawing") 8977 public float getAlpha() { 8978 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8979 } 8980 8981 /** 8982 * Returns whether this View has content which overlaps. This function, intended to be 8983 * overridden by specific View types, is an optimization when alpha is set on a view. If 8984 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8985 * and then composited it into place, which can be expensive. If the view has no overlapping 8986 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8987 * An example of overlapping rendering is a TextView with a background image, such as a 8988 * Button. An example of non-overlapping rendering is a TextView with no background, or 8989 * an ImageView with only the foreground image. The default implementation returns true; 8990 * subclasses should override if they have cases which can be optimized. 8991 * 8992 * @return true if the content in this view might overlap, false otherwise. 8993 */ 8994 public boolean hasOverlappingRendering() { 8995 return true; 8996 } 8997 8998 /** 8999 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 9000 * completely transparent and 1 means the view is completely opaque.</p> 9001 * 9002 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 9003 * responsible for applying the opacity itself. Otherwise, calling this method is 9004 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 9005 * setting a hardware layer.</p> 9006 * 9007 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 9008 * performance implications. It is generally best to use the alpha property sparingly and 9009 * transiently, as in the case of fading animations.</p> 9010 * 9011 * @param alpha The opacity of the view. 9012 * 9013 * @see #setLayerType(int, android.graphics.Paint) 9014 * 9015 * @attr ref android.R.styleable#View_alpha 9016 */ 9017 public void setAlpha(float alpha) { 9018 ensureTransformationInfo(); 9019 if (mTransformationInfo.mAlpha != alpha) { 9020 mTransformationInfo.mAlpha = alpha; 9021 if (onSetAlpha((int) (alpha * 255))) { 9022 mPrivateFlags |= ALPHA_SET; 9023 // subclass is handling alpha - don't optimize rendering cache invalidation 9024 invalidateParentCaches(); 9025 invalidate(true); 9026 } else { 9027 mPrivateFlags &= ~ALPHA_SET; 9028 invalidateViewProperty(true, false); 9029 if (mDisplayList != null) { 9030 mDisplayList.setAlpha(alpha); 9031 } 9032 } 9033 } 9034 } 9035 9036 /** 9037 * Faster version of setAlpha() which performs the same steps except there are 9038 * no calls to invalidate(). The caller of this function should perform proper invalidation 9039 * on the parent and this object. The return value indicates whether the subclass handles 9040 * alpha (the return value for onSetAlpha()). 9041 * 9042 * @param alpha The new value for the alpha property 9043 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 9044 * the new value for the alpha property is different from the old value 9045 */ 9046 boolean setAlphaNoInvalidation(float alpha) { 9047 ensureTransformationInfo(); 9048 if (mTransformationInfo.mAlpha != alpha) { 9049 mTransformationInfo.mAlpha = alpha; 9050 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 9051 if (subclassHandlesAlpha) { 9052 mPrivateFlags |= ALPHA_SET; 9053 return true; 9054 } else { 9055 mPrivateFlags &= ~ALPHA_SET; 9056 if (mDisplayList != null) { 9057 mDisplayList.setAlpha(alpha); 9058 } 9059 } 9060 } 9061 return false; 9062 } 9063 9064 /** 9065 * Top position of this view relative to its parent. 9066 * 9067 * @return The top of this view, in pixels. 9068 */ 9069 @ViewDebug.CapturedViewProperty 9070 public final int getTop() { 9071 return mTop; 9072 } 9073 9074 /** 9075 * Sets the top position of this view relative to its parent. This method is meant to be called 9076 * by the layout system and should not generally be called otherwise, because the property 9077 * may be changed at any time by the layout. 9078 * 9079 * @param top The top of this view, in pixels. 9080 */ 9081 public final void setTop(int top) { 9082 if (top != mTop) { 9083 updateMatrix(); 9084 final boolean matrixIsIdentity = mTransformationInfo == null 9085 || mTransformationInfo.mMatrixIsIdentity; 9086 if (matrixIsIdentity) { 9087 if (mAttachInfo != null) { 9088 int minTop; 9089 int yLoc; 9090 if (top < mTop) { 9091 minTop = top; 9092 yLoc = top - mTop; 9093 } else { 9094 minTop = mTop; 9095 yLoc = 0; 9096 } 9097 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 9098 } 9099 } else { 9100 // Double-invalidation is necessary to capture view's old and new areas 9101 invalidate(true); 9102 } 9103 9104 int width = mRight - mLeft; 9105 int oldHeight = mBottom - mTop; 9106 9107 mTop = top; 9108 if (mDisplayList != null) { 9109 mDisplayList.setTop(mTop); 9110 } 9111 9112 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9113 9114 if (!matrixIsIdentity) { 9115 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9116 // A change in dimension means an auto-centered pivot point changes, too 9117 mTransformationInfo.mMatrixDirty = true; 9118 } 9119 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9120 invalidate(true); 9121 } 9122 mBackgroundSizeChanged = true; 9123 invalidateParentIfNeeded(); 9124 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9125 // View was rejected last time it was drawn by its parent; this may have changed 9126 invalidateParentIfNeeded(); 9127 } 9128 } 9129 } 9130 9131 /** 9132 * Bottom position of this view relative to its parent. 9133 * 9134 * @return The bottom of this view, in pixels. 9135 */ 9136 @ViewDebug.CapturedViewProperty 9137 public final int getBottom() { 9138 return mBottom; 9139 } 9140 9141 /** 9142 * True if this view has changed since the last time being drawn. 9143 * 9144 * @return The dirty state of this view. 9145 */ 9146 public boolean isDirty() { 9147 return (mPrivateFlags & DIRTY_MASK) != 0; 9148 } 9149 9150 /** 9151 * Sets the bottom position of this view relative to its parent. This method is meant to be 9152 * called by the layout system and should not generally be called otherwise, because the 9153 * property may be changed at any time by the layout. 9154 * 9155 * @param bottom The bottom of this view, in pixels. 9156 */ 9157 public final void setBottom(int bottom) { 9158 if (bottom != mBottom) { 9159 updateMatrix(); 9160 final boolean matrixIsIdentity = mTransformationInfo == null 9161 || mTransformationInfo.mMatrixIsIdentity; 9162 if (matrixIsIdentity) { 9163 if (mAttachInfo != null) { 9164 int maxBottom; 9165 if (bottom < mBottom) { 9166 maxBottom = mBottom; 9167 } else { 9168 maxBottom = bottom; 9169 } 9170 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 9171 } 9172 } else { 9173 // Double-invalidation is necessary to capture view's old and new areas 9174 invalidate(true); 9175 } 9176 9177 int width = mRight - mLeft; 9178 int oldHeight = mBottom - mTop; 9179 9180 mBottom = bottom; 9181 if (mDisplayList != null) { 9182 mDisplayList.setBottom(mBottom); 9183 } 9184 9185 onSizeChanged(width, mBottom - mTop, width, oldHeight); 9186 9187 if (!matrixIsIdentity) { 9188 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9189 // A change in dimension means an auto-centered pivot point changes, too 9190 mTransformationInfo.mMatrixDirty = true; 9191 } 9192 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9193 invalidate(true); 9194 } 9195 mBackgroundSizeChanged = true; 9196 invalidateParentIfNeeded(); 9197 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9198 // View was rejected last time it was drawn by its parent; this may have changed 9199 invalidateParentIfNeeded(); 9200 } 9201 } 9202 } 9203 9204 /** 9205 * Left position of this view relative to its parent. 9206 * 9207 * @return The left edge of this view, in pixels. 9208 */ 9209 @ViewDebug.CapturedViewProperty 9210 public final int getLeft() { 9211 return mLeft; 9212 } 9213 9214 /** 9215 * Sets the left position of this view relative to its parent. This method is meant to be called 9216 * by the layout system and should not generally be called otherwise, because the property 9217 * may be changed at any time by the layout. 9218 * 9219 * @param left The bottom of this view, in pixels. 9220 */ 9221 public final void setLeft(int left) { 9222 if (left != mLeft) { 9223 updateMatrix(); 9224 final boolean matrixIsIdentity = mTransformationInfo == null 9225 || mTransformationInfo.mMatrixIsIdentity; 9226 if (matrixIsIdentity) { 9227 if (mAttachInfo != null) { 9228 int minLeft; 9229 int xLoc; 9230 if (left < mLeft) { 9231 minLeft = left; 9232 xLoc = left - mLeft; 9233 } else { 9234 minLeft = mLeft; 9235 xLoc = 0; 9236 } 9237 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 9238 } 9239 } else { 9240 // Double-invalidation is necessary to capture view's old and new areas 9241 invalidate(true); 9242 } 9243 9244 int oldWidth = mRight - mLeft; 9245 int height = mBottom - mTop; 9246 9247 mLeft = left; 9248 if (mDisplayList != null) { 9249 mDisplayList.setLeft(left); 9250 } 9251 9252 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9253 9254 if (!matrixIsIdentity) { 9255 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9256 // A change in dimension means an auto-centered pivot point changes, too 9257 mTransformationInfo.mMatrixDirty = true; 9258 } 9259 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9260 invalidate(true); 9261 } 9262 mBackgroundSizeChanged = true; 9263 invalidateParentIfNeeded(); 9264 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9265 // View was rejected last time it was drawn by its parent; this may have changed 9266 invalidateParentIfNeeded(); 9267 } 9268 } 9269 } 9270 9271 /** 9272 * Right position of this view relative to its parent. 9273 * 9274 * @return The right edge of this view, in pixels. 9275 */ 9276 @ViewDebug.CapturedViewProperty 9277 public final int getRight() { 9278 return mRight; 9279 } 9280 9281 /** 9282 * Sets the right position of this view relative to its parent. This method is meant to be called 9283 * by the layout system and should not generally be called otherwise, because the property 9284 * may be changed at any time by the layout. 9285 * 9286 * @param right The bottom of this view, in pixels. 9287 */ 9288 public final void setRight(int right) { 9289 if (right != mRight) { 9290 updateMatrix(); 9291 final boolean matrixIsIdentity = mTransformationInfo == null 9292 || mTransformationInfo.mMatrixIsIdentity; 9293 if (matrixIsIdentity) { 9294 if (mAttachInfo != null) { 9295 int maxRight; 9296 if (right < mRight) { 9297 maxRight = mRight; 9298 } else { 9299 maxRight = right; 9300 } 9301 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 9302 } 9303 } else { 9304 // Double-invalidation is necessary to capture view's old and new areas 9305 invalidate(true); 9306 } 9307 9308 int oldWidth = mRight - mLeft; 9309 int height = mBottom - mTop; 9310 9311 mRight = right; 9312 if (mDisplayList != null) { 9313 mDisplayList.setRight(mRight); 9314 } 9315 9316 onSizeChanged(mRight - mLeft, height, oldWidth, height); 9317 9318 if (!matrixIsIdentity) { 9319 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9320 // A change in dimension means an auto-centered pivot point changes, too 9321 mTransformationInfo.mMatrixDirty = true; 9322 } 9323 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9324 invalidate(true); 9325 } 9326 mBackgroundSizeChanged = true; 9327 invalidateParentIfNeeded(); 9328 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9329 // View was rejected last time it was drawn by its parent; this may have changed 9330 invalidateParentIfNeeded(); 9331 } 9332 } 9333 } 9334 9335 /** 9336 * The visual x position of this view, in pixels. This is equivalent to the 9337 * {@link #setTranslationX(float) translationX} property plus the current 9338 * {@link #getLeft() left} property. 9339 * 9340 * @return The visual x position of this view, in pixels. 9341 */ 9342 @ViewDebug.ExportedProperty(category = "drawing") 9343 public float getX() { 9344 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 9345 } 9346 9347 /** 9348 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 9349 * {@link #setTranslationX(float) translationX} property to be the difference between 9350 * the x value passed in and the current {@link #getLeft() left} property. 9351 * 9352 * @param x The visual x position of this view, in pixels. 9353 */ 9354 public void setX(float x) { 9355 setTranslationX(x - mLeft); 9356 } 9357 9358 /** 9359 * The visual y position of this view, in pixels. This is equivalent to the 9360 * {@link #setTranslationY(float) translationY} property plus the current 9361 * {@link #getTop() top} property. 9362 * 9363 * @return The visual y position of this view, in pixels. 9364 */ 9365 @ViewDebug.ExportedProperty(category = "drawing") 9366 public float getY() { 9367 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9368 } 9369 9370 /** 9371 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9372 * {@link #setTranslationY(float) translationY} property to be the difference between 9373 * the y value passed in and the current {@link #getTop() top} property. 9374 * 9375 * @param y The visual y position of this view, in pixels. 9376 */ 9377 public void setY(float y) { 9378 setTranslationY(y - mTop); 9379 } 9380 9381 9382 /** 9383 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9384 * This position is post-layout, in addition to wherever the object's 9385 * layout placed it. 9386 * 9387 * @return The horizontal position of this view relative to its left position, in pixels. 9388 */ 9389 @ViewDebug.ExportedProperty(category = "drawing") 9390 public float getTranslationX() { 9391 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9392 } 9393 9394 /** 9395 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9396 * This effectively positions the object post-layout, in addition to wherever the object's 9397 * layout placed it. 9398 * 9399 * @param translationX The horizontal position of this view relative to its left position, 9400 * in pixels. 9401 * 9402 * @attr ref android.R.styleable#View_translationX 9403 */ 9404 public void setTranslationX(float translationX) { 9405 ensureTransformationInfo(); 9406 final TransformationInfo info = mTransformationInfo; 9407 if (info.mTranslationX != translationX) { 9408 // Double-invalidation is necessary to capture view's old and new areas 9409 invalidateViewProperty(true, false); 9410 info.mTranslationX = translationX; 9411 info.mMatrixDirty = true; 9412 invalidateViewProperty(false, true); 9413 if (mDisplayList != null) { 9414 mDisplayList.setTranslationX(translationX); 9415 } 9416 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9417 // View was rejected last time it was drawn by its parent; this may have changed 9418 invalidateParentIfNeeded(); 9419 } 9420 } 9421 } 9422 9423 /** 9424 * The horizontal location of this view relative to its {@link #getTop() top} position. 9425 * This position is post-layout, in addition to wherever the object's 9426 * layout placed it. 9427 * 9428 * @return The vertical position of this view relative to its top position, 9429 * in pixels. 9430 */ 9431 @ViewDebug.ExportedProperty(category = "drawing") 9432 public float getTranslationY() { 9433 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9434 } 9435 9436 /** 9437 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9438 * This effectively positions the object post-layout, in addition to wherever the object's 9439 * layout placed it. 9440 * 9441 * @param translationY The vertical position of this view relative to its top position, 9442 * in pixels. 9443 * 9444 * @attr ref android.R.styleable#View_translationY 9445 */ 9446 public void setTranslationY(float translationY) { 9447 ensureTransformationInfo(); 9448 final TransformationInfo info = mTransformationInfo; 9449 if (info.mTranslationY != translationY) { 9450 invalidateViewProperty(true, false); 9451 info.mTranslationY = translationY; 9452 info.mMatrixDirty = true; 9453 invalidateViewProperty(false, true); 9454 if (mDisplayList != null) { 9455 mDisplayList.setTranslationY(translationY); 9456 } 9457 if ((mPrivateFlags2 & VIEW_QUICK_REJECTED) == VIEW_QUICK_REJECTED) { 9458 // View was rejected last time it was drawn by its parent; this may have changed 9459 invalidateParentIfNeeded(); 9460 } 9461 } 9462 } 9463 9464 /** 9465 * Hit rectangle in parent's coordinates 9466 * 9467 * @param outRect The hit rectangle of the view. 9468 */ 9469 public void getHitRect(Rect outRect) { 9470 updateMatrix(); 9471 final TransformationInfo info = mTransformationInfo; 9472 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9473 outRect.set(mLeft, mTop, mRight, mBottom); 9474 } else { 9475 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9476 tmpRect.set(-info.mPivotX, -info.mPivotY, 9477 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9478 info.mMatrix.mapRect(tmpRect); 9479 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9480 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9481 } 9482 } 9483 9484 /** 9485 * Determines whether the given point, in local coordinates is inside the view. 9486 */ 9487 /*package*/ final boolean pointInView(float localX, float localY) { 9488 return localX >= 0 && localX < (mRight - mLeft) 9489 && localY >= 0 && localY < (mBottom - mTop); 9490 } 9491 9492 /** 9493 * Utility method to determine whether the given point, in local coordinates, 9494 * is inside the view, where the area of the view is expanded by the slop factor. 9495 * This method is called while processing touch-move events to determine if the event 9496 * is still within the view. 9497 */ 9498 private boolean pointInView(float localX, float localY, float slop) { 9499 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9500 localY < ((mBottom - mTop) + slop); 9501 } 9502 9503 /** 9504 * When a view has focus and the user navigates away from it, the next view is searched for 9505 * starting from the rectangle filled in by this method. 9506 * 9507 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9508 * of the view. However, if your view maintains some idea of internal selection, 9509 * such as a cursor, or a selected row or column, you should override this method and 9510 * fill in a more specific rectangle. 9511 * 9512 * @param r The rectangle to fill in, in this view's coordinates. 9513 */ 9514 public void getFocusedRect(Rect r) { 9515 getDrawingRect(r); 9516 } 9517 9518 /** 9519 * If some part of this view is not clipped by any of its parents, then 9520 * return that area in r in global (root) coordinates. To convert r to local 9521 * coordinates (without taking possible View rotations into account), offset 9522 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9523 * If the view is completely clipped or translated out, return false. 9524 * 9525 * @param r If true is returned, r holds the global coordinates of the 9526 * visible portion of this view. 9527 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9528 * between this view and its root. globalOffet may be null. 9529 * @return true if r is non-empty (i.e. part of the view is visible at the 9530 * root level. 9531 */ 9532 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9533 int width = mRight - mLeft; 9534 int height = mBottom - mTop; 9535 if (width > 0 && height > 0) { 9536 r.set(0, 0, width, height); 9537 if (globalOffset != null) { 9538 globalOffset.set(-mScrollX, -mScrollY); 9539 } 9540 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9541 } 9542 return false; 9543 } 9544 9545 public final boolean getGlobalVisibleRect(Rect r) { 9546 return getGlobalVisibleRect(r, null); 9547 } 9548 9549 public final boolean getLocalVisibleRect(Rect r) { 9550 final Point offset = mAttachInfo != null ? mAttachInfo.mPoint : new Point(); 9551 if (getGlobalVisibleRect(r, offset)) { 9552 r.offset(-offset.x, -offset.y); // make r local 9553 return true; 9554 } 9555 return false; 9556 } 9557 9558 /** 9559 * Offset this view's vertical location by the specified number of pixels. 9560 * 9561 * @param offset the number of pixels to offset the view by 9562 */ 9563 public void offsetTopAndBottom(int offset) { 9564 if (offset != 0) { 9565 updateMatrix(); 9566 final boolean matrixIsIdentity = mTransformationInfo == null 9567 || mTransformationInfo.mMatrixIsIdentity; 9568 if (matrixIsIdentity) { 9569 if (mDisplayList != null) { 9570 invalidateViewProperty(false, false); 9571 } else { 9572 final ViewParent p = mParent; 9573 if (p != null && mAttachInfo != null) { 9574 final Rect r = mAttachInfo.mTmpInvalRect; 9575 int minTop; 9576 int maxBottom; 9577 int yLoc; 9578 if (offset < 0) { 9579 minTop = mTop + offset; 9580 maxBottom = mBottom; 9581 yLoc = offset; 9582 } else { 9583 minTop = mTop; 9584 maxBottom = mBottom + offset; 9585 yLoc = 0; 9586 } 9587 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9588 p.invalidateChild(this, r); 9589 } 9590 } 9591 } else { 9592 invalidateViewProperty(false, false); 9593 } 9594 9595 mTop += offset; 9596 mBottom += offset; 9597 if (mDisplayList != null) { 9598 mDisplayList.offsetTopBottom(offset); 9599 invalidateViewProperty(false, false); 9600 } else { 9601 if (!matrixIsIdentity) { 9602 invalidateViewProperty(false, true); 9603 } 9604 invalidateParentIfNeeded(); 9605 } 9606 } 9607 } 9608 9609 /** 9610 * Offset this view's horizontal location by the specified amount of pixels. 9611 * 9612 * @param offset the numer of pixels to offset the view by 9613 */ 9614 public void offsetLeftAndRight(int offset) { 9615 if (offset != 0) { 9616 updateMatrix(); 9617 final boolean matrixIsIdentity = mTransformationInfo == null 9618 || mTransformationInfo.mMatrixIsIdentity; 9619 if (matrixIsIdentity) { 9620 if (mDisplayList != null) { 9621 invalidateViewProperty(false, false); 9622 } else { 9623 final ViewParent p = mParent; 9624 if (p != null && mAttachInfo != null) { 9625 final Rect r = mAttachInfo.mTmpInvalRect; 9626 int minLeft; 9627 int maxRight; 9628 if (offset < 0) { 9629 minLeft = mLeft + offset; 9630 maxRight = mRight; 9631 } else { 9632 minLeft = mLeft; 9633 maxRight = mRight + offset; 9634 } 9635 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9636 p.invalidateChild(this, r); 9637 } 9638 } 9639 } else { 9640 invalidateViewProperty(false, false); 9641 } 9642 9643 mLeft += offset; 9644 mRight += offset; 9645 if (mDisplayList != null) { 9646 mDisplayList.offsetLeftRight(offset); 9647 invalidateViewProperty(false, false); 9648 } else { 9649 if (!matrixIsIdentity) { 9650 invalidateViewProperty(false, true); 9651 } 9652 invalidateParentIfNeeded(); 9653 } 9654 } 9655 } 9656 9657 /** 9658 * Get the LayoutParams associated with this view. All views should have 9659 * layout parameters. These supply parameters to the <i>parent</i> of this 9660 * view specifying how it should be arranged. There are many subclasses of 9661 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9662 * of ViewGroup that are responsible for arranging their children. 9663 * 9664 * This method may return null if this View is not attached to a parent 9665 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9666 * was not invoked successfully. When a View is attached to a parent 9667 * ViewGroup, this method must not return null. 9668 * 9669 * @return The LayoutParams associated with this view, or null if no 9670 * parameters have been set yet 9671 */ 9672 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9673 public ViewGroup.LayoutParams getLayoutParams() { 9674 return mLayoutParams; 9675 } 9676 9677 /** 9678 * Set the layout parameters associated with this view. These supply 9679 * parameters to the <i>parent</i> of this view specifying how it should be 9680 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9681 * correspond to the different subclasses of ViewGroup that are responsible 9682 * for arranging their children. 9683 * 9684 * @param params The layout parameters for this view, cannot be null 9685 */ 9686 public void setLayoutParams(ViewGroup.LayoutParams params) { 9687 if (params == null) { 9688 throw new NullPointerException("Layout parameters cannot be null"); 9689 } 9690 mLayoutParams = params; 9691 if (mParent instanceof ViewGroup) { 9692 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9693 } 9694 requestLayout(); 9695 } 9696 9697 /** 9698 * Set the scrolled position of your view. This will cause a call to 9699 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9700 * invalidated. 9701 * @param x the x position to scroll to 9702 * @param y the y position to scroll to 9703 */ 9704 public void scrollTo(int x, int y) { 9705 if (mScrollX != x || mScrollY != y) { 9706 int oldX = mScrollX; 9707 int oldY = mScrollY; 9708 mScrollX = x; 9709 mScrollY = y; 9710 invalidateParentCaches(); 9711 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9712 if (!awakenScrollBars()) { 9713 postInvalidateOnAnimation(); 9714 } 9715 } 9716 } 9717 9718 /** 9719 * Move the scrolled position of your view. This will cause a call to 9720 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9721 * invalidated. 9722 * @param x the amount of pixels to scroll by horizontally 9723 * @param y the amount of pixels to scroll by vertically 9724 */ 9725 public void scrollBy(int x, int y) { 9726 scrollTo(mScrollX + x, mScrollY + y); 9727 } 9728 9729 /** 9730 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9731 * animation to fade the scrollbars out after a default delay. If a subclass 9732 * provides animated scrolling, the start delay should equal the duration 9733 * of the scrolling animation.</p> 9734 * 9735 * <p>The animation starts only if at least one of the scrollbars is 9736 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9737 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9738 * this method returns true, and false otherwise. If the animation is 9739 * started, this method calls {@link #invalidate()}; in that case the 9740 * caller should not call {@link #invalidate()}.</p> 9741 * 9742 * <p>This method should be invoked every time a subclass directly updates 9743 * the scroll parameters.</p> 9744 * 9745 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9746 * and {@link #scrollTo(int, int)}.</p> 9747 * 9748 * @return true if the animation is played, false otherwise 9749 * 9750 * @see #awakenScrollBars(int) 9751 * @see #scrollBy(int, int) 9752 * @see #scrollTo(int, int) 9753 * @see #isHorizontalScrollBarEnabled() 9754 * @see #isVerticalScrollBarEnabled() 9755 * @see #setHorizontalScrollBarEnabled(boolean) 9756 * @see #setVerticalScrollBarEnabled(boolean) 9757 */ 9758 protected boolean awakenScrollBars() { 9759 return mScrollCache != null && 9760 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9761 } 9762 9763 /** 9764 * Trigger the scrollbars to draw. 9765 * This method differs from awakenScrollBars() only in its default duration. 9766 * initialAwakenScrollBars() will show the scroll bars for longer than 9767 * usual to give the user more of a chance to notice them. 9768 * 9769 * @return true if the animation is played, false otherwise. 9770 */ 9771 private boolean initialAwakenScrollBars() { 9772 return mScrollCache != null && 9773 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9774 } 9775 9776 /** 9777 * <p> 9778 * Trigger the scrollbars to draw. When invoked this method starts an 9779 * animation to fade the scrollbars out after a fixed delay. If a subclass 9780 * provides animated scrolling, the start delay should equal the duration of 9781 * the scrolling animation. 9782 * </p> 9783 * 9784 * <p> 9785 * The animation starts only if at least one of the scrollbars is enabled, 9786 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9787 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9788 * this method returns true, and false otherwise. If the animation is 9789 * started, this method calls {@link #invalidate()}; in that case the caller 9790 * should not call {@link #invalidate()}. 9791 * </p> 9792 * 9793 * <p> 9794 * This method should be invoked everytime a subclass directly updates the 9795 * scroll parameters. 9796 * </p> 9797 * 9798 * @param startDelay the delay, in milliseconds, after which the animation 9799 * should start; when the delay is 0, the animation starts 9800 * immediately 9801 * @return true if the animation is played, false otherwise 9802 * 9803 * @see #scrollBy(int, int) 9804 * @see #scrollTo(int, int) 9805 * @see #isHorizontalScrollBarEnabled() 9806 * @see #isVerticalScrollBarEnabled() 9807 * @see #setHorizontalScrollBarEnabled(boolean) 9808 * @see #setVerticalScrollBarEnabled(boolean) 9809 */ 9810 protected boolean awakenScrollBars(int startDelay) { 9811 return awakenScrollBars(startDelay, true); 9812 } 9813 9814 /** 9815 * <p> 9816 * Trigger the scrollbars to draw. When invoked this method starts an 9817 * animation to fade the scrollbars out after a fixed delay. If a subclass 9818 * provides animated scrolling, the start delay should equal the duration of 9819 * the scrolling animation. 9820 * </p> 9821 * 9822 * <p> 9823 * The animation starts only if at least one of the scrollbars is enabled, 9824 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9825 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9826 * this method returns true, and false otherwise. If the animation is 9827 * started, this method calls {@link #invalidate()} if the invalidate parameter 9828 * is set to true; in that case the caller 9829 * should not call {@link #invalidate()}. 9830 * </p> 9831 * 9832 * <p> 9833 * This method should be invoked everytime a subclass directly updates the 9834 * scroll parameters. 9835 * </p> 9836 * 9837 * @param startDelay the delay, in milliseconds, after which the animation 9838 * should start; when the delay is 0, the animation starts 9839 * immediately 9840 * 9841 * @param invalidate Wheter this method should call invalidate 9842 * 9843 * @return true if the animation is played, false otherwise 9844 * 9845 * @see #scrollBy(int, int) 9846 * @see #scrollTo(int, int) 9847 * @see #isHorizontalScrollBarEnabled() 9848 * @see #isVerticalScrollBarEnabled() 9849 * @see #setHorizontalScrollBarEnabled(boolean) 9850 * @see #setVerticalScrollBarEnabled(boolean) 9851 */ 9852 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9853 final ScrollabilityCache scrollCache = mScrollCache; 9854 9855 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9856 return false; 9857 } 9858 9859 if (scrollCache.scrollBar == null) { 9860 scrollCache.scrollBar = new ScrollBarDrawable(); 9861 } 9862 9863 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9864 9865 if (invalidate) { 9866 // Invalidate to show the scrollbars 9867 postInvalidateOnAnimation(); 9868 } 9869 9870 if (scrollCache.state == ScrollabilityCache.OFF) { 9871 // FIXME: this is copied from WindowManagerService. 9872 // We should get this value from the system when it 9873 // is possible to do so. 9874 final int KEY_REPEAT_FIRST_DELAY = 750; 9875 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9876 } 9877 9878 // Tell mScrollCache when we should start fading. This may 9879 // extend the fade start time if one was already scheduled 9880 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9881 scrollCache.fadeStartTime = fadeStartTime; 9882 scrollCache.state = ScrollabilityCache.ON; 9883 9884 // Schedule our fader to run, unscheduling any old ones first 9885 if (mAttachInfo != null) { 9886 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9887 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9888 } 9889 9890 return true; 9891 } 9892 9893 return false; 9894 } 9895 9896 /** 9897 * Do not invalidate views which are not visible and which are not running an animation. They 9898 * will not get drawn and they should not set dirty flags as if they will be drawn 9899 */ 9900 private boolean skipInvalidate() { 9901 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9902 (!(mParent instanceof ViewGroup) || 9903 !((ViewGroup) mParent).isViewTransitioning(this)); 9904 } 9905 /** 9906 * Mark the area defined by dirty as needing to be drawn. If the view is 9907 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9908 * in the future. This must be called from a UI thread. To call from a non-UI 9909 * thread, call {@link #postInvalidate()}. 9910 * 9911 * WARNING: This method is destructive to dirty. 9912 * @param dirty the rectangle representing the bounds of the dirty region 9913 */ 9914 public void invalidate(Rect dirty) { 9915 if (ViewDebug.TRACE_HIERARCHY) { 9916 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9917 } 9918 9919 if (skipInvalidate()) { 9920 return; 9921 } 9922 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9923 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9924 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9925 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9926 mPrivateFlags |= INVALIDATED; 9927 mPrivateFlags |= DIRTY; 9928 final ViewParent p = mParent; 9929 final AttachInfo ai = mAttachInfo; 9930 //noinspection PointlessBooleanExpression,ConstantConditions 9931 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9932 if (p != null && ai != null && ai.mHardwareAccelerated) { 9933 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9934 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9935 p.invalidateChild(this, null); 9936 return; 9937 } 9938 } 9939 if (p != null && ai != null) { 9940 final int scrollX = mScrollX; 9941 final int scrollY = mScrollY; 9942 final Rect r = ai.mTmpInvalRect; 9943 r.set(dirty.left - scrollX, dirty.top - scrollY, 9944 dirty.right - scrollX, dirty.bottom - scrollY); 9945 mParent.invalidateChild(this, r); 9946 } 9947 } 9948 } 9949 9950 /** 9951 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9952 * The coordinates of the dirty rect are relative to the view. 9953 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9954 * will be called at some point in the future. This must be called from 9955 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9956 * @param l the left position of the dirty region 9957 * @param t the top position of the dirty region 9958 * @param r the right position of the dirty region 9959 * @param b the bottom position of the dirty region 9960 */ 9961 public void invalidate(int l, int t, int r, int b) { 9962 if (ViewDebug.TRACE_HIERARCHY) { 9963 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9964 } 9965 9966 if (skipInvalidate()) { 9967 return; 9968 } 9969 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9970 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9971 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9972 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9973 mPrivateFlags |= INVALIDATED; 9974 mPrivateFlags |= DIRTY; 9975 final ViewParent p = mParent; 9976 final AttachInfo ai = mAttachInfo; 9977 //noinspection PointlessBooleanExpression,ConstantConditions 9978 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9979 if (p != null && ai != null && ai.mHardwareAccelerated) { 9980 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9981 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9982 p.invalidateChild(this, null); 9983 return; 9984 } 9985 } 9986 if (p != null && ai != null && l < r && t < b) { 9987 final int scrollX = mScrollX; 9988 final int scrollY = mScrollY; 9989 final Rect tmpr = ai.mTmpInvalRect; 9990 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9991 p.invalidateChild(this, tmpr); 9992 } 9993 } 9994 } 9995 9996 /** 9997 * Invalidate the whole view. If the view is visible, 9998 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9999 * the future. This must be called from a UI thread. To call from a non-UI thread, 10000 * call {@link #postInvalidate()}. 10001 */ 10002 public void invalidate() { 10003 invalidate(true); 10004 } 10005 10006 /** 10007 * This is where the invalidate() work actually happens. A full invalidate() 10008 * causes the drawing cache to be invalidated, but this function can be called with 10009 * invalidateCache set to false to skip that invalidation step for cases that do not 10010 * need it (for example, a component that remains at the same dimensions with the same 10011 * content). 10012 * 10013 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 10014 * well. This is usually true for a full invalidate, but may be set to false if the 10015 * View's contents or dimensions have not changed. 10016 */ 10017 void invalidate(boolean invalidateCache) { 10018 if (ViewDebug.TRACE_HIERARCHY) { 10019 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 10020 } 10021 10022 if (skipInvalidate()) { 10023 return; 10024 } 10025 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 10026 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 10027 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 10028 mLastIsOpaque = isOpaque(); 10029 mPrivateFlags &= ~DRAWN; 10030 mPrivateFlags |= DIRTY; 10031 if (invalidateCache) { 10032 mPrivateFlags |= INVALIDATED; 10033 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10034 } 10035 final AttachInfo ai = mAttachInfo; 10036 final ViewParent p = mParent; 10037 //noinspection PointlessBooleanExpression,ConstantConditions 10038 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 10039 if (p != null && ai != null && ai.mHardwareAccelerated) { 10040 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 10041 // with a null dirty rect, which tells the ViewAncestor to redraw everything 10042 p.invalidateChild(this, null); 10043 return; 10044 } 10045 } 10046 10047 if (p != null && ai != null) { 10048 final Rect r = ai.mTmpInvalRect; 10049 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10050 // Don't call invalidate -- we don't want to internally scroll 10051 // our own bounds 10052 p.invalidateChild(this, r); 10053 } 10054 } 10055 } 10056 10057 /** 10058 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 10059 * set any flags or handle all of the cases handled by the default invalidation methods. 10060 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 10061 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 10062 * walk up the hierarchy, transforming the dirty rect as necessary. 10063 * 10064 * The method also handles normal invalidation logic if display list properties are not 10065 * being used in this view. The invalidateParent and forceRedraw flags are used by that 10066 * backup approach, to handle these cases used in the various property-setting methods. 10067 * 10068 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 10069 * are not being used in this view 10070 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 10071 * list properties are not being used in this view 10072 */ 10073 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 10074 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 10075 if (invalidateParent) { 10076 invalidateParentCaches(); 10077 } 10078 if (forceRedraw) { 10079 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 10080 } 10081 invalidate(false); 10082 } else { 10083 final AttachInfo ai = mAttachInfo; 10084 final ViewParent p = mParent; 10085 if (p != null && ai != null) { 10086 final Rect r = ai.mTmpInvalRect; 10087 r.set(0, 0, mRight - mLeft, mBottom - mTop); 10088 if (mParent instanceof ViewGroup) { 10089 ((ViewGroup) mParent).invalidateChildFast(this, r); 10090 } else { 10091 mParent.invalidateChild(this, r); 10092 } 10093 } 10094 } 10095 } 10096 10097 /** 10098 * Utility method to transform a given Rect by the current matrix of this view. 10099 */ 10100 void transformRect(final Rect rect) { 10101 if (!getMatrix().isIdentity()) { 10102 RectF boundingRect = mAttachInfo.mTmpTransformRect; 10103 boundingRect.set(rect); 10104 getMatrix().mapRect(boundingRect); 10105 rect.set((int) (boundingRect.left - 0.5f), 10106 (int) (boundingRect.top - 0.5f), 10107 (int) (boundingRect.right + 0.5f), 10108 (int) (boundingRect.bottom + 0.5f)); 10109 } 10110 } 10111 10112 /** 10113 * Used to indicate that the parent of this view should clear its caches. This functionality 10114 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10115 * which is necessary when various parent-managed properties of the view change, such as 10116 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 10117 * clears the parent caches and does not causes an invalidate event. 10118 * 10119 * @hide 10120 */ 10121 protected void invalidateParentCaches() { 10122 if (mParent instanceof View) { 10123 ((View) mParent).mPrivateFlags |= INVALIDATED; 10124 } 10125 } 10126 10127 /** 10128 * Used to indicate that the parent of this view should be invalidated. This functionality 10129 * is used to force the parent to rebuild its display list (when hardware-accelerated), 10130 * which is necessary when various parent-managed properties of the view change, such as 10131 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 10132 * an invalidation event to the parent. 10133 * 10134 * @hide 10135 */ 10136 protected void invalidateParentIfNeeded() { 10137 if (isHardwareAccelerated() && mParent instanceof View) { 10138 ((View) mParent).invalidate(true); 10139 } 10140 } 10141 10142 /** 10143 * Indicates whether this View is opaque. An opaque View guarantees that it will 10144 * draw all the pixels overlapping its bounds using a fully opaque color. 10145 * 10146 * Subclasses of View should override this method whenever possible to indicate 10147 * whether an instance is opaque. Opaque Views are treated in a special way by 10148 * the View hierarchy, possibly allowing it to perform optimizations during 10149 * invalidate/draw passes. 10150 * 10151 * @return True if this View is guaranteed to be fully opaque, false otherwise. 10152 */ 10153 @ViewDebug.ExportedProperty(category = "drawing") 10154 public boolean isOpaque() { 10155 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 10156 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 10157 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 10158 } 10159 10160 /** 10161 * @hide 10162 */ 10163 protected void computeOpaqueFlags() { 10164 // Opaque if: 10165 // - Has a background 10166 // - Background is opaque 10167 // - Doesn't have scrollbars or scrollbars are inside overlay 10168 10169 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 10170 mPrivateFlags |= OPAQUE_BACKGROUND; 10171 } else { 10172 mPrivateFlags &= ~OPAQUE_BACKGROUND; 10173 } 10174 10175 final int flags = mViewFlags; 10176 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 10177 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 10178 mPrivateFlags |= OPAQUE_SCROLLBARS; 10179 } else { 10180 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 10181 } 10182 } 10183 10184 /** 10185 * @hide 10186 */ 10187 protected boolean hasOpaqueScrollbars() { 10188 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 10189 } 10190 10191 /** 10192 * @return A handler associated with the thread running the View. This 10193 * handler can be used to pump events in the UI events queue. 10194 */ 10195 public Handler getHandler() { 10196 if (mAttachInfo != null) { 10197 return mAttachInfo.mHandler; 10198 } 10199 return null; 10200 } 10201 10202 /** 10203 * Gets the view root associated with the View. 10204 * @return The view root, or null if none. 10205 * @hide 10206 */ 10207 public ViewRootImpl getViewRootImpl() { 10208 if (mAttachInfo != null) { 10209 return mAttachInfo.mViewRootImpl; 10210 } 10211 return null; 10212 } 10213 10214 /** 10215 * <p>Causes the Runnable to be added to the message queue. 10216 * The runnable will be run on the user interface thread.</p> 10217 * 10218 * <p>This method can be invoked from outside of the UI thread 10219 * only when this View is attached to a window.</p> 10220 * 10221 * @param action The Runnable that will be executed. 10222 * 10223 * @return Returns true if the Runnable was successfully placed in to the 10224 * message queue. Returns false on failure, usually because the 10225 * looper processing the message queue is exiting. 10226 * 10227 * @see #postDelayed 10228 * @see #removeCallbacks 10229 */ 10230 public boolean post(Runnable action) { 10231 final AttachInfo attachInfo = mAttachInfo; 10232 if (attachInfo != null) { 10233 return attachInfo.mHandler.post(action); 10234 } 10235 // Assume that post will succeed later 10236 ViewRootImpl.getRunQueue().post(action); 10237 return true; 10238 } 10239 10240 /** 10241 * <p>Causes the Runnable to be added to the message queue, to be run 10242 * after the specified amount of time elapses. 10243 * The runnable will be run on the user interface thread.</p> 10244 * 10245 * <p>This method can be invoked from outside of the UI thread 10246 * only when this View is attached to a window.</p> 10247 * 10248 * @param action The Runnable that will be executed. 10249 * @param delayMillis The delay (in milliseconds) until the Runnable 10250 * will be executed. 10251 * 10252 * @return true if the Runnable was successfully placed in to the 10253 * message queue. Returns false on failure, usually because the 10254 * looper processing the message queue is exiting. Note that a 10255 * result of true does not mean the Runnable will be processed -- 10256 * if the looper is quit before the delivery time of the message 10257 * occurs then the message will be dropped. 10258 * 10259 * @see #post 10260 * @see #removeCallbacks 10261 */ 10262 public boolean postDelayed(Runnable action, long delayMillis) { 10263 final AttachInfo attachInfo = mAttachInfo; 10264 if (attachInfo != null) { 10265 return attachInfo.mHandler.postDelayed(action, delayMillis); 10266 } 10267 // Assume that post will succeed later 10268 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10269 return true; 10270 } 10271 10272 /** 10273 * <p>Causes the Runnable to execute on the next animation time step. 10274 * The runnable will be run on the user interface thread.</p> 10275 * 10276 * <p>This method can be invoked from outside of the UI thread 10277 * only when this View is attached to a window.</p> 10278 * 10279 * @param action The Runnable that will be executed. 10280 * 10281 * @see #postOnAnimationDelayed 10282 * @see #removeCallbacks 10283 */ 10284 public void postOnAnimation(Runnable action) { 10285 final AttachInfo attachInfo = mAttachInfo; 10286 if (attachInfo != null) { 10287 attachInfo.mViewRootImpl.mChoreographer.postCallback( 10288 Choreographer.CALLBACK_ANIMATION, action, null); 10289 } else { 10290 // Assume that post will succeed later 10291 ViewRootImpl.getRunQueue().post(action); 10292 } 10293 } 10294 10295 /** 10296 * <p>Causes the Runnable to execute on the next animation time step, 10297 * after the specified amount of time elapses. 10298 * The runnable will be run on the user interface thread.</p> 10299 * 10300 * <p>This method can be invoked from outside of the UI thread 10301 * only when this View is attached to a window.</p> 10302 * 10303 * @param action The Runnable that will be executed. 10304 * @param delayMillis The delay (in milliseconds) until the Runnable 10305 * will be executed. 10306 * 10307 * @see #postOnAnimation 10308 * @see #removeCallbacks 10309 */ 10310 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 10311 final AttachInfo attachInfo = mAttachInfo; 10312 if (attachInfo != null) { 10313 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 10314 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 10315 } else { 10316 // Assume that post will succeed later 10317 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 10318 } 10319 } 10320 10321 /** 10322 * <p>Removes the specified Runnable from the message queue.</p> 10323 * 10324 * <p>This method can be invoked from outside of the UI thread 10325 * only when this View is attached to a window.</p> 10326 * 10327 * @param action The Runnable to remove from the message handling queue 10328 * 10329 * @return true if this view could ask the Handler to remove the Runnable, 10330 * false otherwise. When the returned value is true, the Runnable 10331 * may or may not have been actually removed from the message queue 10332 * (for instance, if the Runnable was not in the queue already.) 10333 * 10334 * @see #post 10335 * @see #postDelayed 10336 * @see #postOnAnimation 10337 * @see #postOnAnimationDelayed 10338 */ 10339 public boolean removeCallbacks(Runnable action) { 10340 if (action != null) { 10341 final AttachInfo attachInfo = mAttachInfo; 10342 if (attachInfo != null) { 10343 attachInfo.mHandler.removeCallbacks(action); 10344 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 10345 Choreographer.CALLBACK_ANIMATION, action, null); 10346 } else { 10347 // Assume that post will succeed later 10348 ViewRootImpl.getRunQueue().removeCallbacks(action); 10349 } 10350 } 10351 return true; 10352 } 10353 10354 /** 10355 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 10356 * Use this to invalidate the View from a non-UI thread.</p> 10357 * 10358 * <p>This method can be invoked from outside of the UI thread 10359 * only when this View is attached to a window.</p> 10360 * 10361 * @see #invalidate() 10362 * @see #postInvalidateDelayed(long) 10363 */ 10364 public void postInvalidate() { 10365 postInvalidateDelayed(0); 10366 } 10367 10368 /** 10369 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10370 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10371 * 10372 * <p>This method can be invoked from outside of the UI thread 10373 * only when this View is attached to a window.</p> 10374 * 10375 * @param left The left coordinate of the rectangle to invalidate. 10376 * @param top The top coordinate of the rectangle to invalidate. 10377 * @param right The right coordinate of the rectangle to invalidate. 10378 * @param bottom The bottom coordinate of the rectangle to invalidate. 10379 * 10380 * @see #invalidate(int, int, int, int) 10381 * @see #invalidate(Rect) 10382 * @see #postInvalidateDelayed(long, int, int, int, int) 10383 */ 10384 public void postInvalidate(int left, int top, int right, int bottom) { 10385 postInvalidateDelayed(0, left, top, right, bottom); 10386 } 10387 10388 /** 10389 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10390 * loop. Waits for the specified amount of time.</p> 10391 * 10392 * <p>This method can be invoked from outside of the UI thread 10393 * only when this View is attached to a window.</p> 10394 * 10395 * @param delayMilliseconds the duration in milliseconds to delay the 10396 * invalidation by 10397 * 10398 * @see #invalidate() 10399 * @see #postInvalidate() 10400 */ 10401 public void postInvalidateDelayed(long delayMilliseconds) { 10402 // We try only with the AttachInfo because there's no point in invalidating 10403 // if we are not attached to our window 10404 final AttachInfo attachInfo = mAttachInfo; 10405 if (attachInfo != null) { 10406 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10407 } 10408 } 10409 10410 /** 10411 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10412 * through the event loop. Waits for the specified amount of time.</p> 10413 * 10414 * <p>This method can be invoked from outside of the UI thread 10415 * only when this View is attached to a window.</p> 10416 * 10417 * @param delayMilliseconds the duration in milliseconds to delay the 10418 * invalidation by 10419 * @param left The left coordinate of the rectangle to invalidate. 10420 * @param top The top coordinate of the rectangle to invalidate. 10421 * @param right The right coordinate of the rectangle to invalidate. 10422 * @param bottom The bottom coordinate of the rectangle to invalidate. 10423 * 10424 * @see #invalidate(int, int, int, int) 10425 * @see #invalidate(Rect) 10426 * @see #postInvalidate(int, int, int, int) 10427 */ 10428 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10429 int right, int bottom) { 10430 10431 // We try only with the AttachInfo because there's no point in invalidating 10432 // if we are not attached to our window 10433 final AttachInfo attachInfo = mAttachInfo; 10434 if (attachInfo != null) { 10435 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10436 info.target = this; 10437 info.left = left; 10438 info.top = top; 10439 info.right = right; 10440 info.bottom = bottom; 10441 10442 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10443 } 10444 } 10445 10446 /** 10447 * <p>Cause an invalidate to happen on the next animation time step, typically the 10448 * next display frame.</p> 10449 * 10450 * <p>This method can be invoked from outside of the UI thread 10451 * only when this View is attached to a window.</p> 10452 * 10453 * @see #invalidate() 10454 */ 10455 public void postInvalidateOnAnimation() { 10456 // We try only with the AttachInfo because there's no point in invalidating 10457 // if we are not attached to our window 10458 final AttachInfo attachInfo = mAttachInfo; 10459 if (attachInfo != null) { 10460 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10461 } 10462 } 10463 10464 /** 10465 * <p>Cause an invalidate of the specified area to happen on the next animation 10466 * time step, typically the next display frame.</p> 10467 * 10468 * <p>This method can be invoked from outside of the UI thread 10469 * only when this View is attached to a window.</p> 10470 * 10471 * @param left The left coordinate of the rectangle to invalidate. 10472 * @param top The top coordinate of the rectangle to invalidate. 10473 * @param right The right coordinate of the rectangle to invalidate. 10474 * @param bottom The bottom coordinate of the rectangle to invalidate. 10475 * 10476 * @see #invalidate(int, int, int, int) 10477 * @see #invalidate(Rect) 10478 */ 10479 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10480 // We try only with the AttachInfo because there's no point in invalidating 10481 // if we are not attached to our window 10482 final AttachInfo attachInfo = mAttachInfo; 10483 if (attachInfo != null) { 10484 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10485 info.target = this; 10486 info.left = left; 10487 info.top = top; 10488 info.right = right; 10489 info.bottom = bottom; 10490 10491 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10492 } 10493 } 10494 10495 /** 10496 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10497 * This event is sent at most once every 10498 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10499 */ 10500 private void postSendViewScrolledAccessibilityEventCallback() { 10501 if (mSendViewScrolledAccessibilityEvent == null) { 10502 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10503 } 10504 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10505 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10506 postDelayed(mSendViewScrolledAccessibilityEvent, 10507 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10508 } 10509 } 10510 10511 /** 10512 * Called by a parent to request that a child update its values for mScrollX 10513 * and mScrollY if necessary. This will typically be done if the child is 10514 * animating a scroll using a {@link android.widget.Scroller Scroller} 10515 * object. 10516 */ 10517 public void computeScroll() { 10518 } 10519 10520 /** 10521 * <p>Indicate whether the horizontal edges are faded when the view is 10522 * scrolled horizontally.</p> 10523 * 10524 * @return true if the horizontal edges should are faded on scroll, false 10525 * otherwise 10526 * 10527 * @see #setHorizontalFadingEdgeEnabled(boolean) 10528 * 10529 * @attr ref android.R.styleable#View_requiresFadingEdge 10530 */ 10531 public boolean isHorizontalFadingEdgeEnabled() { 10532 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10533 } 10534 10535 /** 10536 * <p>Define whether the horizontal edges should be faded when this view 10537 * is scrolled horizontally.</p> 10538 * 10539 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10540 * be faded when the view is scrolled 10541 * horizontally 10542 * 10543 * @see #isHorizontalFadingEdgeEnabled() 10544 * 10545 * @attr ref android.R.styleable#View_requiresFadingEdge 10546 */ 10547 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10548 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10549 if (horizontalFadingEdgeEnabled) { 10550 initScrollCache(); 10551 } 10552 10553 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10554 } 10555 } 10556 10557 /** 10558 * <p>Indicate whether the vertical edges are faded when the view is 10559 * scrolled horizontally.</p> 10560 * 10561 * @return true if the vertical edges should are faded on scroll, false 10562 * otherwise 10563 * 10564 * @see #setVerticalFadingEdgeEnabled(boolean) 10565 * 10566 * @attr ref android.R.styleable#View_requiresFadingEdge 10567 */ 10568 public boolean isVerticalFadingEdgeEnabled() { 10569 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10570 } 10571 10572 /** 10573 * <p>Define whether the vertical edges should be faded when this view 10574 * is scrolled vertically.</p> 10575 * 10576 * @param verticalFadingEdgeEnabled true if the vertical edges should 10577 * be faded when the view is scrolled 10578 * vertically 10579 * 10580 * @see #isVerticalFadingEdgeEnabled() 10581 * 10582 * @attr ref android.R.styleable#View_requiresFadingEdge 10583 */ 10584 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10585 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10586 if (verticalFadingEdgeEnabled) { 10587 initScrollCache(); 10588 } 10589 10590 mViewFlags ^= FADING_EDGE_VERTICAL; 10591 } 10592 } 10593 10594 /** 10595 * Returns the strength, or intensity, of the top faded edge. The strength is 10596 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10597 * returns 0.0 or 1.0 but no value in between. 10598 * 10599 * Subclasses should override this method to provide a smoother fade transition 10600 * when scrolling occurs. 10601 * 10602 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10603 */ 10604 protected float getTopFadingEdgeStrength() { 10605 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10606 } 10607 10608 /** 10609 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10610 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10611 * returns 0.0 or 1.0 but no value in between. 10612 * 10613 * Subclasses should override this method to provide a smoother fade transition 10614 * when scrolling occurs. 10615 * 10616 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10617 */ 10618 protected float getBottomFadingEdgeStrength() { 10619 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10620 computeVerticalScrollRange() ? 1.0f : 0.0f; 10621 } 10622 10623 /** 10624 * Returns the strength, or intensity, of the left faded edge. The strength is 10625 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10626 * returns 0.0 or 1.0 but no value in between. 10627 * 10628 * Subclasses should override this method to provide a smoother fade transition 10629 * when scrolling occurs. 10630 * 10631 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10632 */ 10633 protected float getLeftFadingEdgeStrength() { 10634 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10635 } 10636 10637 /** 10638 * Returns the strength, or intensity, of the right faded edge. The strength is 10639 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10640 * returns 0.0 or 1.0 but no value in between. 10641 * 10642 * Subclasses should override this method to provide a smoother fade transition 10643 * when scrolling occurs. 10644 * 10645 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10646 */ 10647 protected float getRightFadingEdgeStrength() { 10648 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10649 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10650 } 10651 10652 /** 10653 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10654 * scrollbar is not drawn by default.</p> 10655 * 10656 * @return true if the horizontal scrollbar should be painted, false 10657 * otherwise 10658 * 10659 * @see #setHorizontalScrollBarEnabled(boolean) 10660 */ 10661 public boolean isHorizontalScrollBarEnabled() { 10662 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10663 } 10664 10665 /** 10666 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10667 * scrollbar is not drawn by default.</p> 10668 * 10669 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10670 * be painted 10671 * 10672 * @see #isHorizontalScrollBarEnabled() 10673 */ 10674 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10675 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10676 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10677 computeOpaqueFlags(); 10678 resolvePadding(); 10679 } 10680 } 10681 10682 /** 10683 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10684 * scrollbar is not drawn by default.</p> 10685 * 10686 * @return true if the vertical scrollbar should be painted, false 10687 * otherwise 10688 * 10689 * @see #setVerticalScrollBarEnabled(boolean) 10690 */ 10691 public boolean isVerticalScrollBarEnabled() { 10692 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10693 } 10694 10695 /** 10696 * <p>Define whether the vertical scrollbar should be drawn or not. The 10697 * scrollbar is not drawn by default.</p> 10698 * 10699 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10700 * be painted 10701 * 10702 * @see #isVerticalScrollBarEnabled() 10703 */ 10704 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10705 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10706 mViewFlags ^= SCROLLBARS_VERTICAL; 10707 computeOpaqueFlags(); 10708 resolvePadding(); 10709 } 10710 } 10711 10712 /** 10713 * @hide 10714 */ 10715 protected void recomputePadding() { 10716 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10717 } 10718 10719 /** 10720 * Define whether scrollbars will fade when the view is not scrolling. 10721 * 10722 * @param fadeScrollbars wheter to enable fading 10723 * 10724 * @attr ref android.R.styleable#View_fadeScrollbars 10725 */ 10726 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10727 initScrollCache(); 10728 final ScrollabilityCache scrollabilityCache = mScrollCache; 10729 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10730 if (fadeScrollbars) { 10731 scrollabilityCache.state = ScrollabilityCache.OFF; 10732 } else { 10733 scrollabilityCache.state = ScrollabilityCache.ON; 10734 } 10735 } 10736 10737 /** 10738 * 10739 * Returns true if scrollbars will fade when this view is not scrolling 10740 * 10741 * @return true if scrollbar fading is enabled 10742 * 10743 * @attr ref android.R.styleable#View_fadeScrollbars 10744 */ 10745 public boolean isScrollbarFadingEnabled() { 10746 return mScrollCache != null && mScrollCache.fadeScrollBars; 10747 } 10748 10749 /** 10750 * 10751 * Returns the delay before scrollbars fade. 10752 * 10753 * @return the delay before scrollbars fade 10754 * 10755 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10756 */ 10757 public int getScrollBarDefaultDelayBeforeFade() { 10758 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10759 mScrollCache.scrollBarDefaultDelayBeforeFade; 10760 } 10761 10762 /** 10763 * Define the delay before scrollbars fade. 10764 * 10765 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10766 * 10767 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10768 */ 10769 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10770 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10771 } 10772 10773 /** 10774 * 10775 * Returns the scrollbar fade duration. 10776 * 10777 * @return the scrollbar fade duration 10778 * 10779 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10780 */ 10781 public int getScrollBarFadeDuration() { 10782 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10783 mScrollCache.scrollBarFadeDuration; 10784 } 10785 10786 /** 10787 * Define the scrollbar fade duration. 10788 * 10789 * @param scrollBarFadeDuration - the scrollbar fade duration 10790 * 10791 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10792 */ 10793 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10794 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10795 } 10796 10797 /** 10798 * 10799 * Returns the scrollbar size. 10800 * 10801 * @return the scrollbar size 10802 * 10803 * @attr ref android.R.styleable#View_scrollbarSize 10804 */ 10805 public int getScrollBarSize() { 10806 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10807 mScrollCache.scrollBarSize; 10808 } 10809 10810 /** 10811 * Define the scrollbar size. 10812 * 10813 * @param scrollBarSize - the scrollbar size 10814 * 10815 * @attr ref android.R.styleable#View_scrollbarSize 10816 */ 10817 public void setScrollBarSize(int scrollBarSize) { 10818 getScrollCache().scrollBarSize = scrollBarSize; 10819 } 10820 10821 /** 10822 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10823 * inset. When inset, they add to the padding of the view. And the scrollbars 10824 * can be drawn inside the padding area or on the edge of the view. For example, 10825 * if a view has a background drawable and you want to draw the scrollbars 10826 * inside the padding specified by the drawable, you can use 10827 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10828 * appear at the edge of the view, ignoring the padding, then you can use 10829 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10830 * @param style the style of the scrollbars. Should be one of 10831 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10832 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10833 * @see #SCROLLBARS_INSIDE_OVERLAY 10834 * @see #SCROLLBARS_INSIDE_INSET 10835 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10836 * @see #SCROLLBARS_OUTSIDE_INSET 10837 * 10838 * @attr ref android.R.styleable#View_scrollbarStyle 10839 */ 10840 public void setScrollBarStyle(int style) { 10841 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10842 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10843 computeOpaqueFlags(); 10844 resolvePadding(); 10845 } 10846 } 10847 10848 /** 10849 * <p>Returns the current scrollbar style.</p> 10850 * @return the current scrollbar style 10851 * @see #SCROLLBARS_INSIDE_OVERLAY 10852 * @see #SCROLLBARS_INSIDE_INSET 10853 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10854 * @see #SCROLLBARS_OUTSIDE_INSET 10855 * 10856 * @attr ref android.R.styleable#View_scrollbarStyle 10857 */ 10858 @ViewDebug.ExportedProperty(mapping = { 10859 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10860 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10861 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10862 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10863 }) 10864 public int getScrollBarStyle() { 10865 return mViewFlags & SCROLLBARS_STYLE_MASK; 10866 } 10867 10868 /** 10869 * <p>Compute the horizontal range that the horizontal scrollbar 10870 * represents.</p> 10871 * 10872 * <p>The range is expressed in arbitrary units that must be the same as the 10873 * units used by {@link #computeHorizontalScrollExtent()} and 10874 * {@link #computeHorizontalScrollOffset()}.</p> 10875 * 10876 * <p>The default range is the drawing width of this view.</p> 10877 * 10878 * @return the total horizontal range represented by the horizontal 10879 * scrollbar 10880 * 10881 * @see #computeHorizontalScrollExtent() 10882 * @see #computeHorizontalScrollOffset() 10883 * @see android.widget.ScrollBarDrawable 10884 */ 10885 protected int computeHorizontalScrollRange() { 10886 return getWidth(); 10887 } 10888 10889 /** 10890 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10891 * within the horizontal range. This value is used to compute the position 10892 * of the thumb within the scrollbar's track.</p> 10893 * 10894 * <p>The range is expressed in arbitrary units that must be the same as the 10895 * units used by {@link #computeHorizontalScrollRange()} and 10896 * {@link #computeHorizontalScrollExtent()}.</p> 10897 * 10898 * <p>The default offset is the scroll offset of this view.</p> 10899 * 10900 * @return the horizontal offset of the scrollbar's thumb 10901 * 10902 * @see #computeHorizontalScrollRange() 10903 * @see #computeHorizontalScrollExtent() 10904 * @see android.widget.ScrollBarDrawable 10905 */ 10906 protected int computeHorizontalScrollOffset() { 10907 return mScrollX; 10908 } 10909 10910 /** 10911 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10912 * within the horizontal range. This value is used to compute the length 10913 * of the thumb within the scrollbar's track.</p> 10914 * 10915 * <p>The range is expressed in arbitrary units that must be the same as the 10916 * units used by {@link #computeHorizontalScrollRange()} and 10917 * {@link #computeHorizontalScrollOffset()}.</p> 10918 * 10919 * <p>The default extent is the drawing width of this view.</p> 10920 * 10921 * @return the horizontal extent of the scrollbar's thumb 10922 * 10923 * @see #computeHorizontalScrollRange() 10924 * @see #computeHorizontalScrollOffset() 10925 * @see android.widget.ScrollBarDrawable 10926 */ 10927 protected int computeHorizontalScrollExtent() { 10928 return getWidth(); 10929 } 10930 10931 /** 10932 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10933 * 10934 * <p>The range is expressed in arbitrary units that must be the same as the 10935 * units used by {@link #computeVerticalScrollExtent()} and 10936 * {@link #computeVerticalScrollOffset()}.</p> 10937 * 10938 * @return the total vertical range represented by the vertical scrollbar 10939 * 10940 * <p>The default range is the drawing height of this view.</p> 10941 * 10942 * @see #computeVerticalScrollExtent() 10943 * @see #computeVerticalScrollOffset() 10944 * @see android.widget.ScrollBarDrawable 10945 */ 10946 protected int computeVerticalScrollRange() { 10947 return getHeight(); 10948 } 10949 10950 /** 10951 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10952 * within the horizontal range. This value is used to compute the position 10953 * of the thumb within the scrollbar's track.</p> 10954 * 10955 * <p>The range is expressed in arbitrary units that must be the same as the 10956 * units used by {@link #computeVerticalScrollRange()} and 10957 * {@link #computeVerticalScrollExtent()}.</p> 10958 * 10959 * <p>The default offset is the scroll offset of this view.</p> 10960 * 10961 * @return the vertical offset of the scrollbar's thumb 10962 * 10963 * @see #computeVerticalScrollRange() 10964 * @see #computeVerticalScrollExtent() 10965 * @see android.widget.ScrollBarDrawable 10966 */ 10967 protected int computeVerticalScrollOffset() { 10968 return mScrollY; 10969 } 10970 10971 /** 10972 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10973 * within the vertical range. This value is used to compute the length 10974 * of the thumb within the scrollbar's track.</p> 10975 * 10976 * <p>The range is expressed in arbitrary units that must be the same as the 10977 * units used by {@link #computeVerticalScrollRange()} and 10978 * {@link #computeVerticalScrollOffset()}.</p> 10979 * 10980 * <p>The default extent is the drawing height of this view.</p> 10981 * 10982 * @return the vertical extent of the scrollbar's thumb 10983 * 10984 * @see #computeVerticalScrollRange() 10985 * @see #computeVerticalScrollOffset() 10986 * @see android.widget.ScrollBarDrawable 10987 */ 10988 protected int computeVerticalScrollExtent() { 10989 return getHeight(); 10990 } 10991 10992 /** 10993 * Check if this view can be scrolled horizontally in a certain direction. 10994 * 10995 * @param direction Negative to check scrolling left, positive to check scrolling right. 10996 * @return true if this view can be scrolled in the specified direction, false otherwise. 10997 */ 10998 public boolean canScrollHorizontally(int direction) { 10999 final int offset = computeHorizontalScrollOffset(); 11000 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 11001 if (range == 0) return false; 11002 if (direction < 0) { 11003 return offset > 0; 11004 } else { 11005 return offset < range - 1; 11006 } 11007 } 11008 11009 /** 11010 * Check if this view can be scrolled vertically in a certain direction. 11011 * 11012 * @param direction Negative to check scrolling up, positive to check scrolling down. 11013 * @return true if this view can be scrolled in the specified direction, false otherwise. 11014 */ 11015 public boolean canScrollVertically(int direction) { 11016 final int offset = computeVerticalScrollOffset(); 11017 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 11018 if (range == 0) return false; 11019 if (direction < 0) { 11020 return offset > 0; 11021 } else { 11022 return offset < range - 1; 11023 } 11024 } 11025 11026 /** 11027 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 11028 * scrollbars are painted only if they have been awakened first.</p> 11029 * 11030 * @param canvas the canvas on which to draw the scrollbars 11031 * 11032 * @see #awakenScrollBars(int) 11033 */ 11034 protected final void onDrawScrollBars(Canvas canvas) { 11035 // scrollbars are drawn only when the animation is running 11036 final ScrollabilityCache cache = mScrollCache; 11037 if (cache != null) { 11038 11039 int state = cache.state; 11040 11041 if (state == ScrollabilityCache.OFF) { 11042 return; 11043 } 11044 11045 boolean invalidate = false; 11046 11047 if (state == ScrollabilityCache.FADING) { 11048 // We're fading -- get our fade interpolation 11049 if (cache.interpolatorValues == null) { 11050 cache.interpolatorValues = new float[1]; 11051 } 11052 11053 float[] values = cache.interpolatorValues; 11054 11055 // Stops the animation if we're done 11056 if (cache.scrollBarInterpolator.timeToValues(values) == 11057 Interpolator.Result.FREEZE_END) { 11058 cache.state = ScrollabilityCache.OFF; 11059 } else { 11060 cache.scrollBar.setAlpha(Math.round(values[0])); 11061 } 11062 11063 // This will make the scroll bars inval themselves after 11064 // drawing. We only want this when we're fading so that 11065 // we prevent excessive redraws 11066 invalidate = true; 11067 } else { 11068 // We're just on -- but we may have been fading before so 11069 // reset alpha 11070 cache.scrollBar.setAlpha(255); 11071 } 11072 11073 11074 final int viewFlags = mViewFlags; 11075 11076 final boolean drawHorizontalScrollBar = 11077 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 11078 final boolean drawVerticalScrollBar = 11079 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 11080 && !isVerticalScrollBarHidden(); 11081 11082 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 11083 final int width = mRight - mLeft; 11084 final int height = mBottom - mTop; 11085 11086 final ScrollBarDrawable scrollBar = cache.scrollBar; 11087 11088 final int scrollX = mScrollX; 11089 final int scrollY = mScrollY; 11090 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 11091 11092 int left, top, right, bottom; 11093 11094 if (drawHorizontalScrollBar) { 11095 int size = scrollBar.getSize(false); 11096 if (size <= 0) { 11097 size = cache.scrollBarSize; 11098 } 11099 11100 scrollBar.setParameters(computeHorizontalScrollRange(), 11101 computeHorizontalScrollOffset(), 11102 computeHorizontalScrollExtent(), false); 11103 final int verticalScrollBarGap = drawVerticalScrollBar ? 11104 getVerticalScrollbarWidth() : 0; 11105 top = scrollY + height - size - (mUserPaddingBottom & inside); 11106 left = scrollX + (mPaddingLeft & inside); 11107 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 11108 bottom = top + size; 11109 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 11110 if (invalidate) { 11111 invalidate(left, top, right, bottom); 11112 } 11113 } 11114 11115 if (drawVerticalScrollBar) { 11116 int size = scrollBar.getSize(true); 11117 if (size <= 0) { 11118 size = cache.scrollBarSize; 11119 } 11120 11121 scrollBar.setParameters(computeVerticalScrollRange(), 11122 computeVerticalScrollOffset(), 11123 computeVerticalScrollExtent(), true); 11124 switch (mVerticalScrollbarPosition) { 11125 default: 11126 case SCROLLBAR_POSITION_DEFAULT: 11127 case SCROLLBAR_POSITION_RIGHT: 11128 left = scrollX + width - size - (mUserPaddingRight & inside); 11129 break; 11130 case SCROLLBAR_POSITION_LEFT: 11131 left = scrollX + (mUserPaddingLeft & inside); 11132 break; 11133 } 11134 top = scrollY + (mPaddingTop & inside); 11135 right = left + size; 11136 bottom = scrollY + height - (mUserPaddingBottom & inside); 11137 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 11138 if (invalidate) { 11139 invalidate(left, top, right, bottom); 11140 } 11141 } 11142 } 11143 } 11144 } 11145 11146 /** 11147 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 11148 * FastScroller is visible. 11149 * @return whether to temporarily hide the vertical scrollbar 11150 * @hide 11151 */ 11152 protected boolean isVerticalScrollBarHidden() { 11153 return false; 11154 } 11155 11156 /** 11157 * <p>Draw the horizontal scrollbar if 11158 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 11159 * 11160 * @param canvas the canvas on which to draw the scrollbar 11161 * @param scrollBar the scrollbar's drawable 11162 * 11163 * @see #isHorizontalScrollBarEnabled() 11164 * @see #computeHorizontalScrollRange() 11165 * @see #computeHorizontalScrollExtent() 11166 * @see #computeHorizontalScrollOffset() 11167 * @see android.widget.ScrollBarDrawable 11168 * @hide 11169 */ 11170 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 11171 int l, int t, int r, int b) { 11172 scrollBar.setBounds(l, t, r, b); 11173 scrollBar.draw(canvas); 11174 } 11175 11176 /** 11177 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 11178 * returns true.</p> 11179 * 11180 * @param canvas the canvas on which to draw the scrollbar 11181 * @param scrollBar the scrollbar's drawable 11182 * 11183 * @see #isVerticalScrollBarEnabled() 11184 * @see #computeVerticalScrollRange() 11185 * @see #computeVerticalScrollExtent() 11186 * @see #computeVerticalScrollOffset() 11187 * @see android.widget.ScrollBarDrawable 11188 * @hide 11189 */ 11190 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 11191 int l, int t, int r, int b) { 11192 scrollBar.setBounds(l, t, r, b); 11193 scrollBar.draw(canvas); 11194 } 11195 11196 /** 11197 * Implement this to do your drawing. 11198 * 11199 * @param canvas the canvas on which the background will be drawn 11200 */ 11201 protected void onDraw(Canvas canvas) { 11202 } 11203 11204 /* 11205 * Caller is responsible for calling requestLayout if necessary. 11206 * (This allows addViewInLayout to not request a new layout.) 11207 */ 11208 void assignParent(ViewParent parent) { 11209 if (mParent == null) { 11210 mParent = parent; 11211 } else if (parent == null) { 11212 mParent = null; 11213 } else { 11214 throw new RuntimeException("view " + this + " being added, but" 11215 + " it already has a parent"); 11216 } 11217 } 11218 11219 /** 11220 * This is called when the view is attached to a window. At this point it 11221 * has a Surface and will start drawing. Note that this function is 11222 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 11223 * however it may be called any time before the first onDraw -- including 11224 * before or after {@link #onMeasure(int, int)}. 11225 * 11226 * @see #onDetachedFromWindow() 11227 */ 11228 protected void onAttachedToWindow() { 11229 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 11230 mParent.requestTransparentRegion(this); 11231 } 11232 11233 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 11234 initialAwakenScrollBars(); 11235 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 11236 } 11237 11238 jumpDrawablesToCurrentState(); 11239 11240 // Order is important here: LayoutDirection MUST be resolved before Padding 11241 // and TextDirection 11242 resolveLayoutDirection(); 11243 resolvePadding(); 11244 resolveTextDirection(); 11245 resolveTextAlignment(); 11246 11247 clearAccessibilityFocus(); 11248 if (isFocused()) { 11249 InputMethodManager imm = InputMethodManager.peekInstance(); 11250 imm.focusIn(this); 11251 } 11252 11253 if (mAttachInfo != null && mDisplayList != null) { 11254 mAttachInfo.mViewRootImpl.dequeueDisplayList(mDisplayList); 11255 } 11256 } 11257 11258 /** 11259 * @see #onScreenStateChanged(int) 11260 */ 11261 void dispatchScreenStateChanged(int screenState) { 11262 onScreenStateChanged(screenState); 11263 } 11264 11265 /** 11266 * This method is called whenever the state of the screen this view is 11267 * attached to changes. A state change will usually occurs when the screen 11268 * turns on or off (whether it happens automatically or the user does it 11269 * manually.) 11270 * 11271 * @param screenState The new state of the screen. Can be either 11272 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 11273 */ 11274 public void onScreenStateChanged(int screenState) { 11275 } 11276 11277 /** 11278 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 11279 */ 11280 private boolean hasRtlSupport() { 11281 return mContext.getApplicationInfo().hasRtlSupport(); 11282 } 11283 11284 /** 11285 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 11286 * that the parent directionality can and will be resolved before its children. 11287 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 11288 * @hide 11289 */ 11290 public void resolveLayoutDirection() { 11291 // Clear any previous layout direction resolution 11292 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11293 11294 if (hasRtlSupport()) { 11295 // Set resolved depending on layout direction 11296 switch (getLayoutDirection()) { 11297 case LAYOUT_DIRECTION_INHERIT: 11298 // If this is root view, no need to look at parent's layout dir. 11299 if (canResolveLayoutDirection()) { 11300 ViewGroup viewGroup = ((ViewGroup) mParent); 11301 11302 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11303 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11304 } 11305 } else { 11306 // Nothing to do, LTR by default 11307 } 11308 break; 11309 case LAYOUT_DIRECTION_RTL: 11310 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11311 break; 11312 case LAYOUT_DIRECTION_LOCALE: 11313 if(isLayoutDirectionRtl(Locale.getDefault())) { 11314 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 11315 } 11316 break; 11317 default: 11318 // Nothing to do, LTR by default 11319 } 11320 } 11321 11322 // Set to resolved 11323 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 11324 onResolvedLayoutDirectionChanged(); 11325 // Resolve padding 11326 resolvePadding(); 11327 } 11328 11329 /** 11330 * Called when layout direction has been resolved. 11331 * 11332 * The default implementation does nothing. 11333 * @hide 11334 */ 11335 public void onResolvedLayoutDirectionChanged() { 11336 } 11337 11338 /** 11339 * Resolve padding depending on layout direction. 11340 * @hide 11341 */ 11342 public void resolvePadding() { 11343 // If the user specified the absolute padding (either with android:padding or 11344 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 11345 // use the default padding or the padding from the background drawable 11346 // (stored at this point in mPadding*) 11347 int resolvedLayoutDirection = getResolvedLayoutDirection(); 11348 switch (resolvedLayoutDirection) { 11349 case LAYOUT_DIRECTION_RTL: 11350 // Start user padding override Right user padding. Otherwise, if Right user 11351 // padding is not defined, use the default Right padding. If Right user padding 11352 // is defined, just use it. 11353 if (mUserPaddingStart >= 0) { 11354 mUserPaddingRight = mUserPaddingStart; 11355 } else if (mUserPaddingRight < 0) { 11356 mUserPaddingRight = mPaddingRight; 11357 } 11358 if (mUserPaddingEnd >= 0) { 11359 mUserPaddingLeft = mUserPaddingEnd; 11360 } else if (mUserPaddingLeft < 0) { 11361 mUserPaddingLeft = mPaddingLeft; 11362 } 11363 break; 11364 case LAYOUT_DIRECTION_LTR: 11365 default: 11366 // Start user padding override Left user padding. Otherwise, if Left user 11367 // padding is not defined, use the default left padding. If Left user padding 11368 // is defined, just use it. 11369 if (mUserPaddingStart >= 0) { 11370 mUserPaddingLeft = mUserPaddingStart; 11371 } else if (mUserPaddingLeft < 0) { 11372 mUserPaddingLeft = mPaddingLeft; 11373 } 11374 if (mUserPaddingEnd >= 0) { 11375 mUserPaddingRight = mUserPaddingEnd; 11376 } else if (mUserPaddingRight < 0) { 11377 mUserPaddingRight = mPaddingRight; 11378 } 11379 } 11380 11381 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11382 11383 if(isPaddingRelative()) { 11384 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11385 } else { 11386 recomputePadding(); 11387 } 11388 onPaddingChanged(resolvedLayoutDirection); 11389 } 11390 11391 /** 11392 * Resolve padding depending on the layout direction. Subclasses that care about 11393 * padding resolution should override this method. The default implementation does 11394 * nothing. 11395 * 11396 * @param layoutDirection the direction of the layout 11397 * 11398 * @see {@link #LAYOUT_DIRECTION_LTR} 11399 * @see {@link #LAYOUT_DIRECTION_RTL} 11400 * @hide 11401 */ 11402 public void onPaddingChanged(int layoutDirection) { 11403 } 11404 11405 /** 11406 * Check if layout direction resolution can be done. 11407 * 11408 * @return true if layout direction resolution can be done otherwise return false. 11409 * @hide 11410 */ 11411 public boolean canResolveLayoutDirection() { 11412 switch (getLayoutDirection()) { 11413 case LAYOUT_DIRECTION_INHERIT: 11414 return (mParent != null) && (mParent instanceof ViewGroup); 11415 default: 11416 return true; 11417 } 11418 } 11419 11420 /** 11421 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11422 * when reset is done. 11423 * @hide 11424 */ 11425 public void resetResolvedLayoutDirection() { 11426 // Reset the current resolved bits 11427 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11428 onResolvedLayoutDirectionReset(); 11429 // Reset also the text direction 11430 resetResolvedTextDirection(); 11431 } 11432 11433 /** 11434 * Called during reset of resolved layout direction. 11435 * 11436 * Subclasses need to override this method to clear cached information that depends on the 11437 * resolved layout direction, or to inform child views that inherit their layout direction. 11438 * 11439 * The default implementation does nothing. 11440 * @hide 11441 */ 11442 public void onResolvedLayoutDirectionReset() { 11443 } 11444 11445 /** 11446 * Check if a Locale uses an RTL script. 11447 * 11448 * @param locale Locale to check 11449 * @return true if the Locale uses an RTL script. 11450 * @hide 11451 */ 11452 protected static boolean isLayoutDirectionRtl(Locale locale) { 11453 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11454 } 11455 11456 /** 11457 * This is called when the view is detached from a window. At this point it 11458 * no longer has a surface for drawing. 11459 * 11460 * @see #onAttachedToWindow() 11461 */ 11462 protected void onDetachedFromWindow() { 11463 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11464 11465 removeUnsetPressCallback(); 11466 removeLongPressCallback(); 11467 removePerformClickCallback(); 11468 removeSendViewScrolledAccessibilityEventCallback(); 11469 11470 destroyDrawingCache(); 11471 11472 destroyLayer(false); 11473 11474 if (mAttachInfo != null) { 11475 if (mDisplayList != null) { 11476 mAttachInfo.mViewRootImpl.enqueueDisplayList(mDisplayList); 11477 } 11478 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11479 } else { 11480 if (mDisplayList != null) { 11481 // Should never happen 11482 mDisplayList.invalidate(); 11483 } 11484 } 11485 11486 mCurrentAnimation = null; 11487 11488 resetResolvedLayoutDirection(); 11489 resetResolvedTextAlignment(); 11490 resetAccessibilityStateChanged(); 11491 } 11492 11493 /** 11494 * @return The number of times this view has been attached to a window 11495 */ 11496 protected int getWindowAttachCount() { 11497 return mWindowAttachCount; 11498 } 11499 11500 /** 11501 * Retrieve a unique token identifying the window this view is attached to. 11502 * @return Return the window's token for use in 11503 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11504 */ 11505 public IBinder getWindowToken() { 11506 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11507 } 11508 11509 /** 11510 * Retrieve a unique token identifying the top-level "real" window of 11511 * the window that this view is attached to. That is, this is like 11512 * {@link #getWindowToken}, except if the window this view in is a panel 11513 * window (attached to another containing window), then the token of 11514 * the containing window is returned instead. 11515 * 11516 * @return Returns the associated window token, either 11517 * {@link #getWindowToken()} or the containing window's token. 11518 */ 11519 public IBinder getApplicationWindowToken() { 11520 AttachInfo ai = mAttachInfo; 11521 if (ai != null) { 11522 IBinder appWindowToken = ai.mPanelParentWindowToken; 11523 if (appWindowToken == null) { 11524 appWindowToken = ai.mWindowToken; 11525 } 11526 return appWindowToken; 11527 } 11528 return null; 11529 } 11530 11531 /** 11532 * Retrieve private session object this view hierarchy is using to 11533 * communicate with the window manager. 11534 * @return the session object to communicate with the window manager 11535 */ 11536 /*package*/ IWindowSession getWindowSession() { 11537 return mAttachInfo != null ? mAttachInfo.mSession : null; 11538 } 11539 11540 /** 11541 * @param info the {@link android.view.View.AttachInfo} to associated with 11542 * this view 11543 */ 11544 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11545 //System.out.println("Attached! " + this); 11546 mAttachInfo = info; 11547 mWindowAttachCount++; 11548 // We will need to evaluate the drawable state at least once. 11549 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11550 if (mFloatingTreeObserver != null) { 11551 info.mTreeObserver.merge(mFloatingTreeObserver); 11552 mFloatingTreeObserver = null; 11553 } 11554 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11555 mAttachInfo.mScrollContainers.add(this); 11556 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11557 } 11558 performCollectViewAttributes(mAttachInfo, visibility); 11559 onAttachedToWindow(); 11560 11561 ListenerInfo li = mListenerInfo; 11562 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11563 li != null ? li.mOnAttachStateChangeListeners : null; 11564 if (listeners != null && listeners.size() > 0) { 11565 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11566 // perform the dispatching. The iterator is a safe guard against listeners that 11567 // could mutate the list by calling the various add/remove methods. This prevents 11568 // the array from being modified while we iterate it. 11569 for (OnAttachStateChangeListener listener : listeners) { 11570 listener.onViewAttachedToWindow(this); 11571 } 11572 } 11573 11574 int vis = info.mWindowVisibility; 11575 if (vis != GONE) { 11576 onWindowVisibilityChanged(vis); 11577 } 11578 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11579 // If nobody has evaluated the drawable state yet, then do it now. 11580 refreshDrawableState(); 11581 } 11582 } 11583 11584 void dispatchDetachedFromWindow() { 11585 AttachInfo info = mAttachInfo; 11586 if (info != null) { 11587 int vis = info.mWindowVisibility; 11588 if (vis != GONE) { 11589 onWindowVisibilityChanged(GONE); 11590 } 11591 } 11592 11593 onDetachedFromWindow(); 11594 11595 ListenerInfo li = mListenerInfo; 11596 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11597 li != null ? li.mOnAttachStateChangeListeners : null; 11598 if (listeners != null && listeners.size() > 0) { 11599 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11600 // perform the dispatching. The iterator is a safe guard against listeners that 11601 // could mutate the list by calling the various add/remove methods. This prevents 11602 // the array from being modified while we iterate it. 11603 for (OnAttachStateChangeListener listener : listeners) { 11604 listener.onViewDetachedFromWindow(this); 11605 } 11606 } 11607 11608 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11609 mAttachInfo.mScrollContainers.remove(this); 11610 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11611 } 11612 11613 mAttachInfo = null; 11614 } 11615 11616 /** 11617 * Store this view hierarchy's frozen state into the given container. 11618 * 11619 * @param container The SparseArray in which to save the view's state. 11620 * 11621 * @see #restoreHierarchyState(android.util.SparseArray) 11622 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11623 * @see #onSaveInstanceState() 11624 */ 11625 public void saveHierarchyState(SparseArray<Parcelable> container) { 11626 dispatchSaveInstanceState(container); 11627 } 11628 11629 /** 11630 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11631 * this view and its children. May be overridden to modify how freezing happens to a 11632 * view's children; for example, some views may want to not store state for their children. 11633 * 11634 * @param container The SparseArray in which to save the view's state. 11635 * 11636 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11637 * @see #saveHierarchyState(android.util.SparseArray) 11638 * @see #onSaveInstanceState() 11639 */ 11640 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11641 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11642 mPrivateFlags &= ~SAVE_STATE_CALLED; 11643 Parcelable state = onSaveInstanceState(); 11644 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11645 throw new IllegalStateException( 11646 "Derived class did not call super.onSaveInstanceState()"); 11647 } 11648 if (state != null) { 11649 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11650 // + ": " + state); 11651 container.put(mID, state); 11652 } 11653 } 11654 } 11655 11656 /** 11657 * Hook allowing a view to generate a representation of its internal state 11658 * that can later be used to create a new instance with that same state. 11659 * This state should only contain information that is not persistent or can 11660 * not be reconstructed later. For example, you will never store your 11661 * current position on screen because that will be computed again when a 11662 * new instance of the view is placed in its view hierarchy. 11663 * <p> 11664 * Some examples of things you may store here: the current cursor position 11665 * in a text view (but usually not the text itself since that is stored in a 11666 * content provider or other persistent storage), the currently selected 11667 * item in a list view. 11668 * 11669 * @return Returns a Parcelable object containing the view's current dynamic 11670 * state, or null if there is nothing interesting to save. The 11671 * default implementation returns null. 11672 * @see #onRestoreInstanceState(android.os.Parcelable) 11673 * @see #saveHierarchyState(android.util.SparseArray) 11674 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11675 * @see #setSaveEnabled(boolean) 11676 */ 11677 protected Parcelable onSaveInstanceState() { 11678 mPrivateFlags |= SAVE_STATE_CALLED; 11679 return BaseSavedState.EMPTY_STATE; 11680 } 11681 11682 /** 11683 * Restore this view hierarchy's frozen state from the given container. 11684 * 11685 * @param container The SparseArray which holds previously frozen states. 11686 * 11687 * @see #saveHierarchyState(android.util.SparseArray) 11688 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11689 * @see #onRestoreInstanceState(android.os.Parcelable) 11690 */ 11691 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11692 dispatchRestoreInstanceState(container); 11693 } 11694 11695 /** 11696 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11697 * state for this view and its children. May be overridden to modify how restoring 11698 * happens to a view's children; for example, some views may want to not store state 11699 * for their children. 11700 * 11701 * @param container The SparseArray which holds previously saved state. 11702 * 11703 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11704 * @see #restoreHierarchyState(android.util.SparseArray) 11705 * @see #onRestoreInstanceState(android.os.Parcelable) 11706 */ 11707 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11708 if (mID != NO_ID) { 11709 Parcelable state = container.get(mID); 11710 if (state != null) { 11711 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11712 // + ": " + state); 11713 mPrivateFlags &= ~SAVE_STATE_CALLED; 11714 onRestoreInstanceState(state); 11715 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11716 throw new IllegalStateException( 11717 "Derived class did not call super.onRestoreInstanceState()"); 11718 } 11719 } 11720 } 11721 } 11722 11723 /** 11724 * Hook allowing a view to re-apply a representation of its internal state that had previously 11725 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11726 * null state. 11727 * 11728 * @param state The frozen state that had previously been returned by 11729 * {@link #onSaveInstanceState}. 11730 * 11731 * @see #onSaveInstanceState() 11732 * @see #restoreHierarchyState(android.util.SparseArray) 11733 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11734 */ 11735 protected void onRestoreInstanceState(Parcelable state) { 11736 mPrivateFlags |= SAVE_STATE_CALLED; 11737 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11738 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11739 + "received " + state.getClass().toString() + " instead. This usually happens " 11740 + "when two views of different type have the same id in the same hierarchy. " 11741 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11742 + "other views do not use the same id."); 11743 } 11744 } 11745 11746 /** 11747 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11748 * 11749 * @return the drawing start time in milliseconds 11750 */ 11751 public long getDrawingTime() { 11752 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11753 } 11754 11755 /** 11756 * <p>Enables or disables the duplication of the parent's state into this view. When 11757 * duplication is enabled, this view gets its drawable state from its parent rather 11758 * than from its own internal properties.</p> 11759 * 11760 * <p>Note: in the current implementation, setting this property to true after the 11761 * view was added to a ViewGroup might have no effect at all. This property should 11762 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11763 * 11764 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11765 * property is enabled, an exception will be thrown.</p> 11766 * 11767 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11768 * parent, these states should not be affected by this method.</p> 11769 * 11770 * @param enabled True to enable duplication of the parent's drawable state, false 11771 * to disable it. 11772 * 11773 * @see #getDrawableState() 11774 * @see #isDuplicateParentStateEnabled() 11775 */ 11776 public void setDuplicateParentStateEnabled(boolean enabled) { 11777 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11778 } 11779 11780 /** 11781 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11782 * 11783 * @return True if this view's drawable state is duplicated from the parent, 11784 * false otherwise 11785 * 11786 * @see #getDrawableState() 11787 * @see #setDuplicateParentStateEnabled(boolean) 11788 */ 11789 public boolean isDuplicateParentStateEnabled() { 11790 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11791 } 11792 11793 /** 11794 * <p>Specifies the type of layer backing this view. The layer can be 11795 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11796 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11797 * 11798 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11799 * instance that controls how the layer is composed on screen. The following 11800 * properties of the paint are taken into account when composing the layer:</p> 11801 * <ul> 11802 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11803 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11804 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11805 * </ul> 11806 * 11807 * <p>If this view has an alpha value set to < 1.0 by calling 11808 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11809 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11810 * equivalent to setting a hardware layer on this view and providing a paint with 11811 * the desired alpha value.<p> 11812 * 11813 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11814 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11815 * for more information on when and how to use layers.</p> 11816 * 11817 * @param layerType The ype of layer to use with this view, must be one of 11818 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11819 * {@link #LAYER_TYPE_HARDWARE} 11820 * @param paint The paint used to compose the layer. This argument is optional 11821 * and can be null. It is ignored when the layer type is 11822 * {@link #LAYER_TYPE_NONE} 11823 * 11824 * @see #getLayerType() 11825 * @see #LAYER_TYPE_NONE 11826 * @see #LAYER_TYPE_SOFTWARE 11827 * @see #LAYER_TYPE_HARDWARE 11828 * @see #setAlpha(float) 11829 * 11830 * @attr ref android.R.styleable#View_layerType 11831 */ 11832 public void setLayerType(int layerType, Paint paint) { 11833 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11834 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11835 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11836 } 11837 11838 if (layerType == mLayerType) { 11839 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11840 mLayerPaint = paint == null ? new Paint() : paint; 11841 invalidateParentCaches(); 11842 invalidate(true); 11843 } 11844 return; 11845 } 11846 11847 // Destroy any previous software drawing cache if needed 11848 switch (mLayerType) { 11849 case LAYER_TYPE_HARDWARE: 11850 destroyLayer(false); 11851 // fall through - non-accelerated views may use software layer mechanism instead 11852 case LAYER_TYPE_SOFTWARE: 11853 destroyDrawingCache(); 11854 break; 11855 default: 11856 break; 11857 } 11858 11859 mLayerType = layerType; 11860 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11861 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11862 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11863 11864 invalidateParentCaches(); 11865 invalidate(true); 11866 } 11867 11868 /** 11869 * Indicates whether this view has a static layer. A view with layer type 11870 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11871 * dynamic. 11872 */ 11873 boolean hasStaticLayer() { 11874 return true; 11875 } 11876 11877 /** 11878 * Indicates what type of layer is currently associated with this view. By default 11879 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11880 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11881 * for more information on the different types of layers. 11882 * 11883 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11884 * {@link #LAYER_TYPE_HARDWARE} 11885 * 11886 * @see #setLayerType(int, android.graphics.Paint) 11887 * @see #buildLayer() 11888 * @see #LAYER_TYPE_NONE 11889 * @see #LAYER_TYPE_SOFTWARE 11890 * @see #LAYER_TYPE_HARDWARE 11891 */ 11892 public int getLayerType() { 11893 return mLayerType; 11894 } 11895 11896 /** 11897 * Forces this view's layer to be created and this view to be rendered 11898 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11899 * invoking this method will have no effect. 11900 * 11901 * This method can for instance be used to render a view into its layer before 11902 * starting an animation. If this view is complex, rendering into the layer 11903 * before starting the animation will avoid skipping frames. 11904 * 11905 * @throws IllegalStateException If this view is not attached to a window 11906 * 11907 * @see #setLayerType(int, android.graphics.Paint) 11908 */ 11909 public void buildLayer() { 11910 if (mLayerType == LAYER_TYPE_NONE) return; 11911 11912 if (mAttachInfo == null) { 11913 throw new IllegalStateException("This view must be attached to a window first"); 11914 } 11915 11916 switch (mLayerType) { 11917 case LAYER_TYPE_HARDWARE: 11918 if (mAttachInfo.mHardwareRenderer != null && 11919 mAttachInfo.mHardwareRenderer.isEnabled() && 11920 mAttachInfo.mHardwareRenderer.validate()) { 11921 getHardwareLayer(); 11922 } 11923 break; 11924 case LAYER_TYPE_SOFTWARE: 11925 buildDrawingCache(true); 11926 break; 11927 } 11928 } 11929 11930 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11931 void flushLayer() { 11932 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11933 mHardwareLayer.flush(); 11934 } 11935 } 11936 11937 /** 11938 * <p>Returns a hardware layer that can be used to draw this view again 11939 * without executing its draw method.</p> 11940 * 11941 * @return A HardwareLayer ready to render, or null if an error occurred. 11942 */ 11943 HardwareLayer getHardwareLayer() { 11944 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11945 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11946 return null; 11947 } 11948 11949 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11950 11951 final int width = mRight - mLeft; 11952 final int height = mBottom - mTop; 11953 11954 if (width == 0 || height == 0) { 11955 return null; 11956 } 11957 11958 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11959 if (mHardwareLayer == null) { 11960 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11961 width, height, isOpaque()); 11962 mLocalDirtyRect.set(0, 0, width, height); 11963 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11964 mHardwareLayer.resize(width, height); 11965 mLocalDirtyRect.set(0, 0, width, height); 11966 } 11967 11968 // The layer is not valid if the underlying GPU resources cannot be allocated 11969 if (!mHardwareLayer.isValid()) { 11970 return null; 11971 } 11972 11973 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11974 mLocalDirtyRect.setEmpty(); 11975 } 11976 11977 return mHardwareLayer; 11978 } 11979 11980 /** 11981 * Destroys this View's hardware layer if possible. 11982 * 11983 * @return True if the layer was destroyed, false otherwise. 11984 * 11985 * @see #setLayerType(int, android.graphics.Paint) 11986 * @see #LAYER_TYPE_HARDWARE 11987 */ 11988 boolean destroyLayer(boolean valid) { 11989 if (mHardwareLayer != null) { 11990 AttachInfo info = mAttachInfo; 11991 if (info != null && info.mHardwareRenderer != null && 11992 info.mHardwareRenderer.isEnabled() && 11993 (valid || info.mHardwareRenderer.validate())) { 11994 mHardwareLayer.destroy(); 11995 mHardwareLayer = null; 11996 11997 invalidate(true); 11998 invalidateParentCaches(); 11999 } 12000 return true; 12001 } 12002 return false; 12003 } 12004 12005 /** 12006 * Destroys all hardware rendering resources. This method is invoked 12007 * when the system needs to reclaim resources. Upon execution of this 12008 * method, you should free any OpenGL resources created by the view. 12009 * 12010 * Note: you <strong>must</strong> call 12011 * <code>super.destroyHardwareResources()</code> when overriding 12012 * this method. 12013 * 12014 * @hide 12015 */ 12016 protected void destroyHardwareResources() { 12017 destroyLayer(true); 12018 } 12019 12020 /** 12021 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 12022 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 12023 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 12024 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 12025 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 12026 * null.</p> 12027 * 12028 * <p>Enabling the drawing cache is similar to 12029 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 12030 * acceleration is turned off. When hardware acceleration is turned on, enabling the 12031 * drawing cache has no effect on rendering because the system uses a different mechanism 12032 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 12033 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 12034 * for information on how to enable software and hardware layers.</p> 12035 * 12036 * <p>This API can be used to manually generate 12037 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 12038 * {@link #getDrawingCache()}.</p> 12039 * 12040 * @param enabled true to enable the drawing cache, false otherwise 12041 * 12042 * @see #isDrawingCacheEnabled() 12043 * @see #getDrawingCache() 12044 * @see #buildDrawingCache() 12045 * @see #setLayerType(int, android.graphics.Paint) 12046 */ 12047 public void setDrawingCacheEnabled(boolean enabled) { 12048 mCachingFailed = false; 12049 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 12050 } 12051 12052 /** 12053 * <p>Indicates whether the drawing cache is enabled for this view.</p> 12054 * 12055 * @return true if the drawing cache is enabled 12056 * 12057 * @see #setDrawingCacheEnabled(boolean) 12058 * @see #getDrawingCache() 12059 */ 12060 @ViewDebug.ExportedProperty(category = "drawing") 12061 public boolean isDrawingCacheEnabled() { 12062 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 12063 } 12064 12065 /** 12066 * Debugging utility which recursively outputs the dirty state of a view and its 12067 * descendants. 12068 * 12069 * @hide 12070 */ 12071 @SuppressWarnings({"UnusedDeclaration"}) 12072 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 12073 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 12074 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 12075 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 12076 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 12077 if (clear) { 12078 mPrivateFlags &= clearMask; 12079 } 12080 if (this instanceof ViewGroup) { 12081 ViewGroup parent = (ViewGroup) this; 12082 final int count = parent.getChildCount(); 12083 for (int i = 0; i < count; i++) { 12084 final View child = parent.getChildAt(i); 12085 child.outputDirtyFlags(indent + " ", clear, clearMask); 12086 } 12087 } 12088 } 12089 12090 /** 12091 * This method is used by ViewGroup to cause its children to restore or recreate their 12092 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 12093 * to recreate its own display list, which would happen if it went through the normal 12094 * draw/dispatchDraw mechanisms. 12095 * 12096 * @hide 12097 */ 12098 protected void dispatchGetDisplayList() {} 12099 12100 /** 12101 * A view that is not attached or hardware accelerated cannot create a display list. 12102 * This method checks these conditions and returns the appropriate result. 12103 * 12104 * @return true if view has the ability to create a display list, false otherwise. 12105 * 12106 * @hide 12107 */ 12108 public boolean canHaveDisplayList() { 12109 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 12110 } 12111 12112 /** 12113 * @return The HardwareRenderer associated with that view or null if hardware rendering 12114 * is not supported or this this has not been attached to a window. 12115 * 12116 * @hide 12117 */ 12118 public HardwareRenderer getHardwareRenderer() { 12119 if (mAttachInfo != null) { 12120 return mAttachInfo.mHardwareRenderer; 12121 } 12122 return null; 12123 } 12124 12125 /** 12126 * Returns a DisplayList. If the incoming displayList is null, one will be created. 12127 * Otherwise, the same display list will be returned (after having been rendered into 12128 * along the way, depending on the invalidation state of the view). 12129 * 12130 * @param displayList The previous version of this displayList, could be null. 12131 * @param isLayer Whether the requester of the display list is a layer. If so, 12132 * the view will avoid creating a layer inside the resulting display list. 12133 * @return A new or reused DisplayList object. 12134 */ 12135 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 12136 if (!canHaveDisplayList()) { 12137 return null; 12138 } 12139 12140 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 12141 displayList == null || !displayList.isValid() || 12142 (!isLayer && mRecreateDisplayList))) { 12143 // Don't need to recreate the display list, just need to tell our 12144 // children to restore/recreate theirs 12145 if (displayList != null && displayList.isValid() && 12146 !isLayer && !mRecreateDisplayList) { 12147 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12148 mPrivateFlags &= ~DIRTY_MASK; 12149 dispatchGetDisplayList(); 12150 12151 return displayList; 12152 } 12153 12154 if (!isLayer) { 12155 // If we got here, we're recreating it. Mark it as such to ensure that 12156 // we copy in child display lists into ours in drawChild() 12157 mRecreateDisplayList = true; 12158 } 12159 if (displayList == null) { 12160 final String name = getClass().getSimpleName(); 12161 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 12162 // If we're creating a new display list, make sure our parent gets invalidated 12163 // since they will need to recreate their display list to account for this 12164 // new child display list. 12165 invalidateParentCaches(); 12166 } 12167 12168 boolean caching = false; 12169 final HardwareCanvas canvas = displayList.start(); 12170 int width = mRight - mLeft; 12171 int height = mBottom - mTop; 12172 12173 try { 12174 canvas.setViewport(width, height); 12175 // The dirty rect should always be null for a display list 12176 canvas.onPreDraw(null); 12177 int layerType = ( 12178 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 12179 getLayerType() : LAYER_TYPE_NONE; 12180 if (!isLayer && layerType != LAYER_TYPE_NONE) { 12181 if (layerType == LAYER_TYPE_HARDWARE) { 12182 final HardwareLayer layer = getHardwareLayer(); 12183 if (layer != null && layer.isValid()) { 12184 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 12185 } else { 12186 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 12187 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 12188 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12189 } 12190 caching = true; 12191 } else { 12192 buildDrawingCache(true); 12193 Bitmap cache = getDrawingCache(true); 12194 if (cache != null) { 12195 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 12196 caching = true; 12197 } 12198 } 12199 } else { 12200 12201 computeScroll(); 12202 12203 canvas.translate(-mScrollX, -mScrollY); 12204 if (!isLayer) { 12205 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12206 mPrivateFlags &= ~DIRTY_MASK; 12207 } 12208 12209 // Fast path for layouts with no backgrounds 12210 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12211 dispatchDraw(canvas); 12212 } else { 12213 draw(canvas); 12214 } 12215 } 12216 } finally { 12217 canvas.onPostDraw(); 12218 12219 displayList.end(); 12220 displayList.setCaching(caching); 12221 if (isLayer) { 12222 displayList.setLeftTopRightBottom(0, 0, width, height); 12223 } else { 12224 setDisplayListProperties(displayList); 12225 } 12226 } 12227 } else if (!isLayer) { 12228 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 12229 mPrivateFlags &= ~DIRTY_MASK; 12230 } 12231 12232 return displayList; 12233 } 12234 12235 /** 12236 * Get the DisplayList for the HardwareLayer 12237 * 12238 * @param layer The HardwareLayer whose DisplayList we want 12239 * @return A DisplayList fopr the specified HardwareLayer 12240 */ 12241 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 12242 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 12243 layer.setDisplayList(displayList); 12244 return displayList; 12245 } 12246 12247 12248 /** 12249 * <p>Returns a display list that can be used to draw this view again 12250 * without executing its draw method.</p> 12251 * 12252 * @return A DisplayList ready to replay, or null if caching is not enabled. 12253 * 12254 * @hide 12255 */ 12256 public DisplayList getDisplayList() { 12257 mDisplayList = getDisplayList(mDisplayList, false); 12258 return mDisplayList; 12259 } 12260 12261 /** 12262 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 12263 * 12264 * @return A non-scaled bitmap representing this view or null if cache is disabled. 12265 * 12266 * @see #getDrawingCache(boolean) 12267 */ 12268 public Bitmap getDrawingCache() { 12269 return getDrawingCache(false); 12270 } 12271 12272 /** 12273 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 12274 * is null when caching is disabled. If caching is enabled and the cache is not ready, 12275 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 12276 * draw from the cache when the cache is enabled. To benefit from the cache, you must 12277 * request the drawing cache by calling this method and draw it on screen if the 12278 * returned bitmap is not null.</p> 12279 * 12280 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12281 * this method will create a bitmap of the same size as this view. Because this bitmap 12282 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12283 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12284 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12285 * size than the view. This implies that your application must be able to handle this 12286 * size.</p> 12287 * 12288 * @param autoScale Indicates whether the generated bitmap should be scaled based on 12289 * the current density of the screen when the application is in compatibility 12290 * mode. 12291 * 12292 * @return A bitmap representing this view or null if cache is disabled. 12293 * 12294 * @see #setDrawingCacheEnabled(boolean) 12295 * @see #isDrawingCacheEnabled() 12296 * @see #buildDrawingCache(boolean) 12297 * @see #destroyDrawingCache() 12298 */ 12299 public Bitmap getDrawingCache(boolean autoScale) { 12300 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 12301 return null; 12302 } 12303 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 12304 buildDrawingCache(autoScale); 12305 } 12306 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 12307 } 12308 12309 /** 12310 * <p>Frees the resources used by the drawing cache. If you call 12311 * {@link #buildDrawingCache()} manually without calling 12312 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12313 * should cleanup the cache with this method afterwards.</p> 12314 * 12315 * @see #setDrawingCacheEnabled(boolean) 12316 * @see #buildDrawingCache() 12317 * @see #getDrawingCache() 12318 */ 12319 public void destroyDrawingCache() { 12320 if (mDrawingCache != null) { 12321 mDrawingCache.recycle(); 12322 mDrawingCache = null; 12323 } 12324 if (mUnscaledDrawingCache != null) { 12325 mUnscaledDrawingCache.recycle(); 12326 mUnscaledDrawingCache = null; 12327 } 12328 } 12329 12330 /** 12331 * Setting a solid background color for the drawing cache's bitmaps will improve 12332 * performance and memory usage. Note, though that this should only be used if this 12333 * view will always be drawn on top of a solid color. 12334 * 12335 * @param color The background color to use for the drawing cache's bitmap 12336 * 12337 * @see #setDrawingCacheEnabled(boolean) 12338 * @see #buildDrawingCache() 12339 * @see #getDrawingCache() 12340 */ 12341 public void setDrawingCacheBackgroundColor(int color) { 12342 if (color != mDrawingCacheBackgroundColor) { 12343 mDrawingCacheBackgroundColor = color; 12344 mPrivateFlags &= ~DRAWING_CACHE_VALID; 12345 } 12346 } 12347 12348 /** 12349 * @see #setDrawingCacheBackgroundColor(int) 12350 * 12351 * @return The background color to used for the drawing cache's bitmap 12352 */ 12353 public int getDrawingCacheBackgroundColor() { 12354 return mDrawingCacheBackgroundColor; 12355 } 12356 12357 /** 12358 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 12359 * 12360 * @see #buildDrawingCache(boolean) 12361 */ 12362 public void buildDrawingCache() { 12363 buildDrawingCache(false); 12364 } 12365 12366 /** 12367 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12368 * 12369 * <p>If you call {@link #buildDrawingCache()} manually without calling 12370 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12371 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12372 * 12373 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12374 * this method will create a bitmap of the same size as this view. Because this bitmap 12375 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12376 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12377 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12378 * size than the view. This implies that your application must be able to handle this 12379 * size.</p> 12380 * 12381 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12382 * you do not need the drawing cache bitmap, calling this method will increase memory 12383 * usage and cause the view to be rendered in software once, thus negatively impacting 12384 * performance.</p> 12385 * 12386 * @see #getDrawingCache() 12387 * @see #destroyDrawingCache() 12388 */ 12389 public void buildDrawingCache(boolean autoScale) { 12390 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12391 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12392 mCachingFailed = false; 12393 12394 if (ViewDebug.TRACE_HIERARCHY) { 12395 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12396 } 12397 12398 int width = mRight - mLeft; 12399 int height = mBottom - mTop; 12400 12401 final AttachInfo attachInfo = mAttachInfo; 12402 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12403 12404 if (autoScale && scalingRequired) { 12405 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12406 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12407 } 12408 12409 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12410 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12411 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12412 12413 if (width <= 0 || height <= 0 || 12414 // Projected bitmap size in bytes 12415 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12416 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12417 destroyDrawingCache(); 12418 mCachingFailed = true; 12419 return; 12420 } 12421 12422 boolean clear = true; 12423 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12424 12425 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12426 Bitmap.Config quality; 12427 if (!opaque) { 12428 // Never pick ARGB_4444 because it looks awful 12429 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12430 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12431 case DRAWING_CACHE_QUALITY_AUTO: 12432 quality = Bitmap.Config.ARGB_8888; 12433 break; 12434 case DRAWING_CACHE_QUALITY_LOW: 12435 quality = Bitmap.Config.ARGB_8888; 12436 break; 12437 case DRAWING_CACHE_QUALITY_HIGH: 12438 quality = Bitmap.Config.ARGB_8888; 12439 break; 12440 default: 12441 quality = Bitmap.Config.ARGB_8888; 12442 break; 12443 } 12444 } else { 12445 // Optimization for translucent windows 12446 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12447 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12448 } 12449 12450 // Try to cleanup memory 12451 if (bitmap != null) bitmap.recycle(); 12452 12453 try { 12454 bitmap = Bitmap.createBitmap(width, height, quality); 12455 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12456 if (autoScale) { 12457 mDrawingCache = bitmap; 12458 } else { 12459 mUnscaledDrawingCache = bitmap; 12460 } 12461 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12462 } catch (OutOfMemoryError e) { 12463 // If there is not enough memory to create the bitmap cache, just 12464 // ignore the issue as bitmap caches are not required to draw the 12465 // view hierarchy 12466 if (autoScale) { 12467 mDrawingCache = null; 12468 } else { 12469 mUnscaledDrawingCache = null; 12470 } 12471 mCachingFailed = true; 12472 return; 12473 } 12474 12475 clear = drawingCacheBackgroundColor != 0; 12476 } 12477 12478 Canvas canvas; 12479 if (attachInfo != null) { 12480 canvas = attachInfo.mCanvas; 12481 if (canvas == null) { 12482 canvas = new Canvas(); 12483 } 12484 canvas.setBitmap(bitmap); 12485 // Temporarily clobber the cached Canvas in case one of our children 12486 // is also using a drawing cache. Without this, the children would 12487 // steal the canvas by attaching their own bitmap to it and bad, bad 12488 // thing would happen (invisible views, corrupted drawings, etc.) 12489 attachInfo.mCanvas = null; 12490 } else { 12491 // This case should hopefully never or seldom happen 12492 canvas = new Canvas(bitmap); 12493 } 12494 12495 if (clear) { 12496 bitmap.eraseColor(drawingCacheBackgroundColor); 12497 } 12498 12499 computeScroll(); 12500 final int restoreCount = canvas.save(); 12501 12502 if (autoScale && scalingRequired) { 12503 final float scale = attachInfo.mApplicationScale; 12504 canvas.scale(scale, scale); 12505 } 12506 12507 canvas.translate(-mScrollX, -mScrollY); 12508 12509 mPrivateFlags |= DRAWN; 12510 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12511 mLayerType != LAYER_TYPE_NONE) { 12512 mPrivateFlags |= DRAWING_CACHE_VALID; 12513 } 12514 12515 // Fast path for layouts with no backgrounds 12516 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12517 if (ViewDebug.TRACE_HIERARCHY) { 12518 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12519 } 12520 mPrivateFlags &= ~DIRTY_MASK; 12521 dispatchDraw(canvas); 12522 } else { 12523 draw(canvas); 12524 } 12525 12526 canvas.restoreToCount(restoreCount); 12527 canvas.setBitmap(null); 12528 12529 if (attachInfo != null) { 12530 // Restore the cached Canvas for our siblings 12531 attachInfo.mCanvas = canvas; 12532 } 12533 } 12534 } 12535 12536 /** 12537 * Create a snapshot of the view into a bitmap. We should probably make 12538 * some form of this public, but should think about the API. 12539 */ 12540 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12541 int width = mRight - mLeft; 12542 int height = mBottom - mTop; 12543 12544 final AttachInfo attachInfo = mAttachInfo; 12545 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12546 width = (int) ((width * scale) + 0.5f); 12547 height = (int) ((height * scale) + 0.5f); 12548 12549 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12550 if (bitmap == null) { 12551 throw new OutOfMemoryError(); 12552 } 12553 12554 Resources resources = getResources(); 12555 if (resources != null) { 12556 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12557 } 12558 12559 Canvas canvas; 12560 if (attachInfo != null) { 12561 canvas = attachInfo.mCanvas; 12562 if (canvas == null) { 12563 canvas = new Canvas(); 12564 } 12565 canvas.setBitmap(bitmap); 12566 // Temporarily clobber the cached Canvas in case one of our children 12567 // is also using a drawing cache. Without this, the children would 12568 // steal the canvas by attaching their own bitmap to it and bad, bad 12569 // things would happen (invisible views, corrupted drawings, etc.) 12570 attachInfo.mCanvas = null; 12571 } else { 12572 // This case should hopefully never or seldom happen 12573 canvas = new Canvas(bitmap); 12574 } 12575 12576 if ((backgroundColor & 0xff000000) != 0) { 12577 bitmap.eraseColor(backgroundColor); 12578 } 12579 12580 computeScroll(); 12581 final int restoreCount = canvas.save(); 12582 canvas.scale(scale, scale); 12583 canvas.translate(-mScrollX, -mScrollY); 12584 12585 // Temporarily remove the dirty mask 12586 int flags = mPrivateFlags; 12587 mPrivateFlags &= ~DIRTY_MASK; 12588 12589 // Fast path for layouts with no backgrounds 12590 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12591 dispatchDraw(canvas); 12592 } else { 12593 draw(canvas); 12594 } 12595 12596 mPrivateFlags = flags; 12597 12598 canvas.restoreToCount(restoreCount); 12599 canvas.setBitmap(null); 12600 12601 if (attachInfo != null) { 12602 // Restore the cached Canvas for our siblings 12603 attachInfo.mCanvas = canvas; 12604 } 12605 12606 return bitmap; 12607 } 12608 12609 /** 12610 * Indicates whether this View is currently in edit mode. A View is usually 12611 * in edit mode when displayed within a developer tool. For instance, if 12612 * this View is being drawn by a visual user interface builder, this method 12613 * should return true. 12614 * 12615 * Subclasses should check the return value of this method to provide 12616 * different behaviors if their normal behavior might interfere with the 12617 * host environment. For instance: the class spawns a thread in its 12618 * constructor, the drawing code relies on device-specific features, etc. 12619 * 12620 * This method is usually checked in the drawing code of custom widgets. 12621 * 12622 * @return True if this View is in edit mode, false otherwise. 12623 */ 12624 public boolean isInEditMode() { 12625 return false; 12626 } 12627 12628 /** 12629 * If the View draws content inside its padding and enables fading edges, 12630 * it needs to support padding offsets. Padding offsets are added to the 12631 * fading edges to extend the length of the fade so that it covers pixels 12632 * drawn inside the padding. 12633 * 12634 * Subclasses of this class should override this method if they need 12635 * to draw content inside the padding. 12636 * 12637 * @return True if padding offset must be applied, false otherwise. 12638 * 12639 * @see #getLeftPaddingOffset() 12640 * @see #getRightPaddingOffset() 12641 * @see #getTopPaddingOffset() 12642 * @see #getBottomPaddingOffset() 12643 * 12644 * @since CURRENT 12645 */ 12646 protected boolean isPaddingOffsetRequired() { 12647 return false; 12648 } 12649 12650 /** 12651 * Amount by which to extend the left fading region. Called only when 12652 * {@link #isPaddingOffsetRequired()} returns true. 12653 * 12654 * @return The left padding offset in pixels. 12655 * 12656 * @see #isPaddingOffsetRequired() 12657 * 12658 * @since CURRENT 12659 */ 12660 protected int getLeftPaddingOffset() { 12661 return 0; 12662 } 12663 12664 /** 12665 * Amount by which to extend the right fading region. Called only when 12666 * {@link #isPaddingOffsetRequired()} returns true. 12667 * 12668 * @return The right padding offset in pixels. 12669 * 12670 * @see #isPaddingOffsetRequired() 12671 * 12672 * @since CURRENT 12673 */ 12674 protected int getRightPaddingOffset() { 12675 return 0; 12676 } 12677 12678 /** 12679 * Amount by which to extend the top fading region. Called only when 12680 * {@link #isPaddingOffsetRequired()} returns true. 12681 * 12682 * @return The top padding offset in pixels. 12683 * 12684 * @see #isPaddingOffsetRequired() 12685 * 12686 * @since CURRENT 12687 */ 12688 protected int getTopPaddingOffset() { 12689 return 0; 12690 } 12691 12692 /** 12693 * Amount by which to extend the bottom fading region. Called only when 12694 * {@link #isPaddingOffsetRequired()} returns true. 12695 * 12696 * @return The bottom padding offset in pixels. 12697 * 12698 * @see #isPaddingOffsetRequired() 12699 * 12700 * @since CURRENT 12701 */ 12702 protected int getBottomPaddingOffset() { 12703 return 0; 12704 } 12705 12706 /** 12707 * @hide 12708 * @param offsetRequired 12709 */ 12710 protected int getFadeTop(boolean offsetRequired) { 12711 int top = mPaddingTop; 12712 if (offsetRequired) top += getTopPaddingOffset(); 12713 return top; 12714 } 12715 12716 /** 12717 * @hide 12718 * @param offsetRequired 12719 */ 12720 protected int getFadeHeight(boolean offsetRequired) { 12721 int padding = mPaddingTop; 12722 if (offsetRequired) padding += getTopPaddingOffset(); 12723 return mBottom - mTop - mPaddingBottom - padding; 12724 } 12725 12726 /** 12727 * <p>Indicates whether this view is attached to a hardware accelerated 12728 * window or not.</p> 12729 * 12730 * <p>Even if this method returns true, it does not mean that every call 12731 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12732 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12733 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12734 * window is hardware accelerated, 12735 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12736 * return false, and this method will return true.</p> 12737 * 12738 * @return True if the view is attached to a window and the window is 12739 * hardware accelerated; false in any other case. 12740 */ 12741 public boolean isHardwareAccelerated() { 12742 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12743 } 12744 12745 /** 12746 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12747 * case of an active Animation being run on the view. 12748 */ 12749 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12750 Animation a, boolean scalingRequired) { 12751 Transformation invalidationTransform; 12752 final int flags = parent.mGroupFlags; 12753 final boolean initialized = a.isInitialized(); 12754 if (!initialized) { 12755 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12756 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12757 onAnimationStart(); 12758 } 12759 12760 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12761 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12762 if (parent.mInvalidationTransformation == null) { 12763 parent.mInvalidationTransformation = new Transformation(); 12764 } 12765 invalidationTransform = parent.mInvalidationTransformation; 12766 a.getTransformation(drawingTime, invalidationTransform, 1f); 12767 } else { 12768 invalidationTransform = parent.mChildTransformation; 12769 } 12770 if (more) { 12771 if (!a.willChangeBounds()) { 12772 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12773 parent.FLAG_OPTIMIZE_INVALIDATE) { 12774 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12775 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12776 // The child need to draw an animation, potentially offscreen, so 12777 // make sure we do not cancel invalidate requests 12778 parent.mPrivateFlags |= DRAW_ANIMATION; 12779 parent.invalidate(mLeft, mTop, mRight, mBottom); 12780 } 12781 } else { 12782 if (parent.mInvalidateRegion == null) { 12783 parent.mInvalidateRegion = new RectF(); 12784 } 12785 final RectF region = parent.mInvalidateRegion; 12786 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12787 invalidationTransform); 12788 12789 // The child need to draw an animation, potentially offscreen, so 12790 // make sure we do not cancel invalidate requests 12791 parent.mPrivateFlags |= DRAW_ANIMATION; 12792 12793 final int left = mLeft + (int) region.left; 12794 final int top = mTop + (int) region.top; 12795 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12796 top + (int) (region.height() + .5f)); 12797 } 12798 } 12799 return more; 12800 } 12801 12802 /** 12803 * This method is called by getDisplayList() when a display list is created or re-rendered. 12804 * It sets or resets the current value of all properties on that display list (resetting is 12805 * necessary when a display list is being re-created, because we need to make sure that 12806 * previously-set transform values 12807 */ 12808 void setDisplayListProperties(DisplayList displayList) { 12809 if (displayList != null) { 12810 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12811 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12812 if (mParent instanceof ViewGroup) { 12813 displayList.setClipChildren( 12814 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12815 } 12816 float alpha = 1; 12817 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12818 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12819 ViewGroup parentVG = (ViewGroup) mParent; 12820 final boolean hasTransform = 12821 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12822 if (hasTransform) { 12823 Transformation transform = parentVG.mChildTransformation; 12824 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12825 if (transformType != Transformation.TYPE_IDENTITY) { 12826 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12827 alpha = transform.getAlpha(); 12828 } 12829 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12830 displayList.setStaticMatrix(transform.getMatrix()); 12831 } 12832 } 12833 } 12834 } 12835 if (mTransformationInfo != null) { 12836 alpha *= mTransformationInfo.mAlpha; 12837 if (alpha < 1) { 12838 final int multipliedAlpha = (int) (255 * alpha); 12839 if (onSetAlpha(multipliedAlpha)) { 12840 alpha = 1; 12841 } 12842 } 12843 displayList.setTransformationInfo(alpha, 12844 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12845 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12846 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12847 mTransformationInfo.mScaleY); 12848 if (mTransformationInfo.mCamera == null) { 12849 mTransformationInfo.mCamera = new Camera(); 12850 mTransformationInfo.matrix3D = new Matrix(); 12851 } 12852 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12853 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12854 displayList.setPivotX(getPivotX()); 12855 displayList.setPivotY(getPivotY()); 12856 } 12857 } else if (alpha < 1) { 12858 displayList.setAlpha(alpha); 12859 } 12860 } 12861 } 12862 12863 /** 12864 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12865 * This draw() method is an implementation detail and is not intended to be overridden or 12866 * to be called from anywhere else other than ViewGroup.drawChild(). 12867 */ 12868 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12869 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12870 boolean more = false; 12871 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12872 final int flags = parent.mGroupFlags; 12873 12874 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12875 parent.mChildTransformation.clear(); 12876 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12877 } 12878 12879 Transformation transformToApply = null; 12880 boolean concatMatrix = false; 12881 12882 boolean scalingRequired = false; 12883 boolean caching; 12884 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12885 12886 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12887 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12888 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12889 caching = true; 12890 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12891 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12892 } else { 12893 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12894 } 12895 12896 final Animation a = getAnimation(); 12897 if (a != null) { 12898 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12899 concatMatrix = a.willChangeTransformationMatrix(); 12900 if (concatMatrix) { 12901 mPrivateFlags2 |= VIEW_IS_ANIMATING_TRANSFORM; 12902 } 12903 transformToApply = parent.mChildTransformation; 12904 } else { 12905 if ((mPrivateFlags2 & VIEW_IS_ANIMATING_TRANSFORM) == VIEW_IS_ANIMATING_TRANSFORM && 12906 mDisplayList != null) { 12907 // No longer animating: clear out old animation matrix 12908 mDisplayList.setAnimationMatrix(null); 12909 mPrivateFlags2 &= ~VIEW_IS_ANIMATING_TRANSFORM; 12910 } 12911 if (!useDisplayListProperties && 12912 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12913 final boolean hasTransform = 12914 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12915 if (hasTransform) { 12916 final int transformType = parent.mChildTransformation.getTransformationType(); 12917 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12918 parent.mChildTransformation : null; 12919 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12920 } 12921 } 12922 } 12923 12924 concatMatrix |= !childHasIdentityMatrix; 12925 12926 // Sets the flag as early as possible to allow draw() implementations 12927 // to call invalidate() successfully when doing animations 12928 mPrivateFlags |= DRAWN; 12929 12930 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12931 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12932 mPrivateFlags2 |= VIEW_QUICK_REJECTED; 12933 return more; 12934 } 12935 mPrivateFlags2 &= ~VIEW_QUICK_REJECTED; 12936 12937 if (hardwareAccelerated) { 12938 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12939 // retain the flag's value temporarily in the mRecreateDisplayList flag 12940 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12941 mPrivateFlags &= ~INVALIDATED; 12942 } 12943 12944 computeScroll(); 12945 12946 final int sx = mScrollX; 12947 final int sy = mScrollY; 12948 12949 DisplayList displayList = null; 12950 Bitmap cache = null; 12951 boolean hasDisplayList = false; 12952 if (caching) { 12953 if (!hardwareAccelerated) { 12954 if (layerType != LAYER_TYPE_NONE) { 12955 layerType = LAYER_TYPE_SOFTWARE; 12956 buildDrawingCache(true); 12957 } 12958 cache = getDrawingCache(true); 12959 } else { 12960 switch (layerType) { 12961 case LAYER_TYPE_SOFTWARE: 12962 if (useDisplayListProperties) { 12963 hasDisplayList = canHaveDisplayList(); 12964 } else { 12965 buildDrawingCache(true); 12966 cache = getDrawingCache(true); 12967 } 12968 break; 12969 case LAYER_TYPE_HARDWARE: 12970 if (useDisplayListProperties) { 12971 hasDisplayList = canHaveDisplayList(); 12972 } 12973 break; 12974 case LAYER_TYPE_NONE: 12975 // Delay getting the display list until animation-driven alpha values are 12976 // set up and possibly passed on to the view 12977 hasDisplayList = canHaveDisplayList(); 12978 break; 12979 } 12980 } 12981 } 12982 useDisplayListProperties &= hasDisplayList; 12983 if (useDisplayListProperties) { 12984 displayList = getDisplayList(); 12985 if (!displayList.isValid()) { 12986 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12987 // to getDisplayList(), the display list will be marked invalid and we should not 12988 // try to use it again. 12989 displayList = null; 12990 hasDisplayList = false; 12991 useDisplayListProperties = false; 12992 } 12993 } 12994 12995 final boolean hasNoCache = cache == null || hasDisplayList; 12996 final boolean offsetForScroll = cache == null && !hasDisplayList && 12997 layerType != LAYER_TYPE_HARDWARE; 12998 12999 int restoreTo = -1; 13000 if (!useDisplayListProperties || transformToApply != null) { 13001 restoreTo = canvas.save(); 13002 } 13003 if (offsetForScroll) { 13004 canvas.translate(mLeft - sx, mTop - sy); 13005 } else { 13006 if (!useDisplayListProperties) { 13007 canvas.translate(mLeft, mTop); 13008 } 13009 if (scalingRequired) { 13010 if (useDisplayListProperties) { 13011 // TODO: Might not need this if we put everything inside the DL 13012 restoreTo = canvas.save(); 13013 } 13014 // mAttachInfo cannot be null, otherwise scalingRequired == false 13015 final float scale = 1.0f / mAttachInfo.mApplicationScale; 13016 canvas.scale(scale, scale); 13017 } 13018 } 13019 13020 float alpha = useDisplayListProperties ? 1 : getAlpha(); 13021 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 13022 if (transformToApply != null || !childHasIdentityMatrix) { 13023 int transX = 0; 13024 int transY = 0; 13025 13026 if (offsetForScroll) { 13027 transX = -sx; 13028 transY = -sy; 13029 } 13030 13031 if (transformToApply != null) { 13032 if (concatMatrix) { 13033 if (useDisplayListProperties) { 13034 displayList.setAnimationMatrix(transformToApply.getMatrix()); 13035 } else { 13036 // Undo the scroll translation, apply the transformation matrix, 13037 // then redo the scroll translate to get the correct result. 13038 canvas.translate(-transX, -transY); 13039 canvas.concat(transformToApply.getMatrix()); 13040 canvas.translate(transX, transY); 13041 } 13042 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13043 } 13044 13045 float transformAlpha = transformToApply.getAlpha(); 13046 if (transformAlpha < 1) { 13047 alpha *= transformToApply.getAlpha(); 13048 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13049 } 13050 } 13051 13052 if (!childHasIdentityMatrix && !useDisplayListProperties) { 13053 canvas.translate(-transX, -transY); 13054 canvas.concat(getMatrix()); 13055 canvas.translate(transX, transY); 13056 } 13057 } 13058 13059 if (alpha < 1) { 13060 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 13061 if (hasNoCache) { 13062 final int multipliedAlpha = (int) (255 * alpha); 13063 if (!onSetAlpha(multipliedAlpha)) { 13064 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13065 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 13066 layerType != LAYER_TYPE_NONE) { 13067 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 13068 } 13069 if (useDisplayListProperties) { 13070 displayList.setAlpha(alpha * getAlpha()); 13071 } else if (layerType == LAYER_TYPE_NONE) { 13072 final int scrollX = hasDisplayList ? 0 : sx; 13073 final int scrollY = hasDisplayList ? 0 : sy; 13074 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 13075 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 13076 } 13077 } else { 13078 // Alpha is handled by the child directly, clobber the layer's alpha 13079 mPrivateFlags |= ALPHA_SET; 13080 } 13081 } 13082 } 13083 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13084 onSetAlpha(255); 13085 mPrivateFlags &= ~ALPHA_SET; 13086 } 13087 13088 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 13089 !useDisplayListProperties) { 13090 if (offsetForScroll) { 13091 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 13092 } else { 13093 if (!scalingRequired || cache == null) { 13094 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 13095 } else { 13096 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 13097 } 13098 } 13099 } 13100 13101 if (!useDisplayListProperties && hasDisplayList) { 13102 displayList = getDisplayList(); 13103 if (!displayList.isValid()) { 13104 // Uncommon, but possible. If a view is removed from the hierarchy during the call 13105 // to getDisplayList(), the display list will be marked invalid and we should not 13106 // try to use it again. 13107 displayList = null; 13108 hasDisplayList = false; 13109 } 13110 } 13111 13112 if (hasNoCache) { 13113 boolean layerRendered = false; 13114 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 13115 final HardwareLayer layer = getHardwareLayer(); 13116 if (layer != null && layer.isValid()) { 13117 mLayerPaint.setAlpha((int) (alpha * 255)); 13118 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 13119 layerRendered = true; 13120 } else { 13121 final int scrollX = hasDisplayList ? 0 : sx; 13122 final int scrollY = hasDisplayList ? 0 : sy; 13123 canvas.saveLayer(scrollX, scrollY, 13124 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 13125 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 13126 } 13127 } 13128 13129 if (!layerRendered) { 13130 if (!hasDisplayList) { 13131 // Fast path for layouts with no backgrounds 13132 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 13133 if (ViewDebug.TRACE_HIERARCHY) { 13134 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 13135 } 13136 mPrivateFlags &= ~DIRTY_MASK; 13137 dispatchDraw(canvas); 13138 } else { 13139 draw(canvas); 13140 } 13141 } else { 13142 mPrivateFlags &= ~DIRTY_MASK; 13143 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 13144 } 13145 } 13146 } else if (cache != null) { 13147 mPrivateFlags &= ~DIRTY_MASK; 13148 Paint cachePaint; 13149 13150 if (layerType == LAYER_TYPE_NONE) { 13151 cachePaint = parent.mCachePaint; 13152 if (cachePaint == null) { 13153 cachePaint = new Paint(); 13154 cachePaint.setDither(false); 13155 parent.mCachePaint = cachePaint; 13156 } 13157 if (alpha < 1) { 13158 cachePaint.setAlpha((int) (alpha * 255)); 13159 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13160 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 13161 cachePaint.setAlpha(255); 13162 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 13163 } 13164 } else { 13165 cachePaint = mLayerPaint; 13166 cachePaint.setAlpha((int) (alpha * 255)); 13167 } 13168 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 13169 } 13170 13171 if (restoreTo >= 0) { 13172 canvas.restoreToCount(restoreTo); 13173 } 13174 13175 if (a != null && !more) { 13176 if (!hardwareAccelerated && !a.getFillAfter()) { 13177 onSetAlpha(255); 13178 } 13179 parent.finishAnimatingView(this, a); 13180 } 13181 13182 if (more && hardwareAccelerated) { 13183 // invalidation is the trigger to recreate display lists, so if we're using 13184 // display lists to render, force an invalidate to allow the animation to 13185 // continue drawing another frame 13186 parent.invalidate(true); 13187 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 13188 // alpha animations should cause the child to recreate its display list 13189 invalidate(true); 13190 } 13191 } 13192 13193 mRecreateDisplayList = false; 13194 13195 return more; 13196 } 13197 13198 /** 13199 * Manually render this view (and all of its children) to the given Canvas. 13200 * The view must have already done a full layout before this function is 13201 * called. When implementing a view, implement 13202 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 13203 * If you do need to override this method, call the superclass version. 13204 * 13205 * @param canvas The Canvas to which the View is rendered. 13206 */ 13207 public void draw(Canvas canvas) { 13208 if (ViewDebug.TRACE_HIERARCHY) { 13209 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 13210 } 13211 13212 final int privateFlags = mPrivateFlags; 13213 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 13214 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 13215 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 13216 13217 /* 13218 * Draw traversal performs several drawing steps which must be executed 13219 * in the appropriate order: 13220 * 13221 * 1. Draw the background 13222 * 2. If necessary, save the canvas' layers to prepare for fading 13223 * 3. Draw view's content 13224 * 4. Draw children 13225 * 5. If necessary, draw the fading edges and restore layers 13226 * 6. Draw decorations (scrollbars for instance) 13227 */ 13228 13229 // Step 1, draw the background, if needed 13230 int saveCount; 13231 13232 if (!dirtyOpaque) { 13233 final Drawable background = mBackground; 13234 if (background != null) { 13235 final int scrollX = mScrollX; 13236 final int scrollY = mScrollY; 13237 13238 if (mBackgroundSizeChanged) { 13239 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 13240 mBackgroundSizeChanged = false; 13241 } 13242 13243 if ((scrollX | scrollY) == 0) { 13244 background.draw(canvas); 13245 } else { 13246 canvas.translate(scrollX, scrollY); 13247 background.draw(canvas); 13248 canvas.translate(-scrollX, -scrollY); 13249 } 13250 } 13251 } 13252 13253 // skip step 2 & 5 if possible (common case) 13254 final int viewFlags = mViewFlags; 13255 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 13256 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 13257 if (!verticalEdges && !horizontalEdges) { 13258 // Step 3, draw the content 13259 if (!dirtyOpaque) onDraw(canvas); 13260 13261 // Step 4, draw the children 13262 dispatchDraw(canvas); 13263 13264 // Step 6, draw decorations (scrollbars) 13265 onDrawScrollBars(canvas); 13266 13267 // we're done... 13268 return; 13269 } 13270 13271 /* 13272 * Here we do the full fledged routine... 13273 * (this is an uncommon case where speed matters less, 13274 * this is why we repeat some of the tests that have been 13275 * done above) 13276 */ 13277 13278 boolean drawTop = false; 13279 boolean drawBottom = false; 13280 boolean drawLeft = false; 13281 boolean drawRight = false; 13282 13283 float topFadeStrength = 0.0f; 13284 float bottomFadeStrength = 0.0f; 13285 float leftFadeStrength = 0.0f; 13286 float rightFadeStrength = 0.0f; 13287 13288 // Step 2, save the canvas' layers 13289 int paddingLeft = mPaddingLeft; 13290 13291 final boolean offsetRequired = isPaddingOffsetRequired(); 13292 if (offsetRequired) { 13293 paddingLeft += getLeftPaddingOffset(); 13294 } 13295 13296 int left = mScrollX + paddingLeft; 13297 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 13298 int top = mScrollY + getFadeTop(offsetRequired); 13299 int bottom = top + getFadeHeight(offsetRequired); 13300 13301 if (offsetRequired) { 13302 right += getRightPaddingOffset(); 13303 bottom += getBottomPaddingOffset(); 13304 } 13305 13306 final ScrollabilityCache scrollabilityCache = mScrollCache; 13307 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 13308 int length = (int) fadeHeight; 13309 13310 // clip the fade length if top and bottom fades overlap 13311 // overlapping fades produce odd-looking artifacts 13312 if (verticalEdges && (top + length > bottom - length)) { 13313 length = (bottom - top) / 2; 13314 } 13315 13316 // also clip horizontal fades if necessary 13317 if (horizontalEdges && (left + length > right - length)) { 13318 length = (right - left) / 2; 13319 } 13320 13321 if (verticalEdges) { 13322 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 13323 drawTop = topFadeStrength * fadeHeight > 1.0f; 13324 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 13325 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 13326 } 13327 13328 if (horizontalEdges) { 13329 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 13330 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 13331 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 13332 drawRight = rightFadeStrength * fadeHeight > 1.0f; 13333 } 13334 13335 saveCount = canvas.getSaveCount(); 13336 13337 int solidColor = getSolidColor(); 13338 if (solidColor == 0) { 13339 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 13340 13341 if (drawTop) { 13342 canvas.saveLayer(left, top, right, top + length, null, flags); 13343 } 13344 13345 if (drawBottom) { 13346 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 13347 } 13348 13349 if (drawLeft) { 13350 canvas.saveLayer(left, top, left + length, bottom, null, flags); 13351 } 13352 13353 if (drawRight) { 13354 canvas.saveLayer(right - length, top, right, bottom, null, flags); 13355 } 13356 } else { 13357 scrollabilityCache.setFadeColor(solidColor); 13358 } 13359 13360 // Step 3, draw the content 13361 if (!dirtyOpaque) onDraw(canvas); 13362 13363 // Step 4, draw the children 13364 dispatchDraw(canvas); 13365 13366 // Step 5, draw the fade effect and restore layers 13367 final Paint p = scrollabilityCache.paint; 13368 final Matrix matrix = scrollabilityCache.matrix; 13369 final Shader fade = scrollabilityCache.shader; 13370 13371 if (drawTop) { 13372 matrix.setScale(1, fadeHeight * topFadeStrength); 13373 matrix.postTranslate(left, top); 13374 fade.setLocalMatrix(matrix); 13375 canvas.drawRect(left, top, right, top + length, p); 13376 } 13377 13378 if (drawBottom) { 13379 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13380 matrix.postRotate(180); 13381 matrix.postTranslate(left, bottom); 13382 fade.setLocalMatrix(matrix); 13383 canvas.drawRect(left, bottom - length, right, bottom, p); 13384 } 13385 13386 if (drawLeft) { 13387 matrix.setScale(1, fadeHeight * leftFadeStrength); 13388 matrix.postRotate(-90); 13389 matrix.postTranslate(left, top); 13390 fade.setLocalMatrix(matrix); 13391 canvas.drawRect(left, top, left + length, bottom, p); 13392 } 13393 13394 if (drawRight) { 13395 matrix.setScale(1, fadeHeight * rightFadeStrength); 13396 matrix.postRotate(90); 13397 matrix.postTranslate(right, top); 13398 fade.setLocalMatrix(matrix); 13399 canvas.drawRect(right - length, top, right, bottom, p); 13400 } 13401 13402 canvas.restoreToCount(saveCount); 13403 13404 // Step 6, draw decorations (scrollbars) 13405 onDrawScrollBars(canvas); 13406 } 13407 13408 /** 13409 * Override this if your view is known to always be drawn on top of a solid color background, 13410 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13411 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13412 * should be set to 0xFF. 13413 * 13414 * @see #setVerticalFadingEdgeEnabled(boolean) 13415 * @see #setHorizontalFadingEdgeEnabled(boolean) 13416 * 13417 * @return The known solid color background for this view, or 0 if the color may vary 13418 */ 13419 @ViewDebug.ExportedProperty(category = "drawing") 13420 public int getSolidColor() { 13421 return 0; 13422 } 13423 13424 /** 13425 * Build a human readable string representation of the specified view flags. 13426 * 13427 * @param flags the view flags to convert to a string 13428 * @return a String representing the supplied flags 13429 */ 13430 private static String printFlags(int flags) { 13431 String output = ""; 13432 int numFlags = 0; 13433 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13434 output += "TAKES_FOCUS"; 13435 numFlags++; 13436 } 13437 13438 switch (flags & VISIBILITY_MASK) { 13439 case INVISIBLE: 13440 if (numFlags > 0) { 13441 output += " "; 13442 } 13443 output += "INVISIBLE"; 13444 // USELESS HERE numFlags++; 13445 break; 13446 case GONE: 13447 if (numFlags > 0) { 13448 output += " "; 13449 } 13450 output += "GONE"; 13451 // USELESS HERE numFlags++; 13452 break; 13453 default: 13454 break; 13455 } 13456 return output; 13457 } 13458 13459 /** 13460 * Build a human readable string representation of the specified private 13461 * view flags. 13462 * 13463 * @param privateFlags the private view flags to convert to a string 13464 * @return a String representing the supplied flags 13465 */ 13466 private static String printPrivateFlags(int privateFlags) { 13467 String output = ""; 13468 int numFlags = 0; 13469 13470 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13471 output += "WANTS_FOCUS"; 13472 numFlags++; 13473 } 13474 13475 if ((privateFlags & FOCUSED) == FOCUSED) { 13476 if (numFlags > 0) { 13477 output += " "; 13478 } 13479 output += "FOCUSED"; 13480 numFlags++; 13481 } 13482 13483 if ((privateFlags & SELECTED) == SELECTED) { 13484 if (numFlags > 0) { 13485 output += " "; 13486 } 13487 output += "SELECTED"; 13488 numFlags++; 13489 } 13490 13491 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13492 if (numFlags > 0) { 13493 output += " "; 13494 } 13495 output += "IS_ROOT_NAMESPACE"; 13496 numFlags++; 13497 } 13498 13499 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13500 if (numFlags > 0) { 13501 output += " "; 13502 } 13503 output += "HAS_BOUNDS"; 13504 numFlags++; 13505 } 13506 13507 if ((privateFlags & DRAWN) == DRAWN) { 13508 if (numFlags > 0) { 13509 output += " "; 13510 } 13511 output += "DRAWN"; 13512 // USELESS HERE numFlags++; 13513 } 13514 return output; 13515 } 13516 13517 /** 13518 * <p>Indicates whether or not this view's layout will be requested during 13519 * the next hierarchy layout pass.</p> 13520 * 13521 * @return true if the layout will be forced during next layout pass 13522 */ 13523 public boolean isLayoutRequested() { 13524 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13525 } 13526 13527 /** 13528 * Assign a size and position to a view and all of its 13529 * descendants 13530 * 13531 * <p>This is the second phase of the layout mechanism. 13532 * (The first is measuring). In this phase, each parent calls 13533 * layout on all of its children to position them. 13534 * This is typically done using the child measurements 13535 * that were stored in the measure pass().</p> 13536 * 13537 * <p>Derived classes should not override this method. 13538 * Derived classes with children should override 13539 * onLayout. In that method, they should 13540 * call layout on each of their children.</p> 13541 * 13542 * @param l Left position, relative to parent 13543 * @param t Top position, relative to parent 13544 * @param r Right position, relative to parent 13545 * @param b Bottom position, relative to parent 13546 */ 13547 @SuppressWarnings({"unchecked"}) 13548 public void layout(int l, int t, int r, int b) { 13549 int oldL = mLeft; 13550 int oldT = mTop; 13551 int oldB = mBottom; 13552 int oldR = mRight; 13553 boolean changed = setFrame(l, t, r, b); 13554 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13555 if (ViewDebug.TRACE_HIERARCHY) { 13556 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13557 } 13558 13559 onLayout(changed, l, t, r, b); 13560 mPrivateFlags &= ~LAYOUT_REQUIRED; 13561 13562 ListenerInfo li = mListenerInfo; 13563 if (li != null && li.mOnLayoutChangeListeners != null) { 13564 ArrayList<OnLayoutChangeListener> listenersCopy = 13565 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13566 int numListeners = listenersCopy.size(); 13567 for (int i = 0; i < numListeners; ++i) { 13568 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13569 } 13570 } 13571 } 13572 mPrivateFlags &= ~FORCE_LAYOUT; 13573 } 13574 13575 /** 13576 * Called from layout when this view should 13577 * assign a size and position to each of its children. 13578 * 13579 * Derived classes with children should override 13580 * this method and call layout on each of 13581 * their children. 13582 * @param changed This is a new size or position for this view 13583 * @param left Left position, relative to parent 13584 * @param top Top position, relative to parent 13585 * @param right Right position, relative to parent 13586 * @param bottom Bottom position, relative to parent 13587 */ 13588 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13589 } 13590 13591 /** 13592 * Assign a size and position to this view. 13593 * 13594 * This is called from layout. 13595 * 13596 * @param left Left position, relative to parent 13597 * @param top Top position, relative to parent 13598 * @param right Right position, relative to parent 13599 * @param bottom Bottom position, relative to parent 13600 * @return true if the new size and position are different than the 13601 * previous ones 13602 * {@hide} 13603 */ 13604 protected boolean setFrame(int left, int top, int right, int bottom) { 13605 boolean changed = false; 13606 13607 if (DBG) { 13608 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13609 + right + "," + bottom + ")"); 13610 } 13611 13612 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13613 changed = true; 13614 13615 // Remember our drawn bit 13616 int drawn = mPrivateFlags & DRAWN; 13617 13618 int oldWidth = mRight - mLeft; 13619 int oldHeight = mBottom - mTop; 13620 int newWidth = right - left; 13621 int newHeight = bottom - top; 13622 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13623 13624 // Invalidate our old position 13625 invalidate(sizeChanged); 13626 13627 mLeft = left; 13628 mTop = top; 13629 mRight = right; 13630 mBottom = bottom; 13631 if (mDisplayList != null) { 13632 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13633 } 13634 13635 mPrivateFlags |= HAS_BOUNDS; 13636 13637 13638 if (sizeChanged) { 13639 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13640 // A change in dimension means an auto-centered pivot point changes, too 13641 if (mTransformationInfo != null) { 13642 mTransformationInfo.mMatrixDirty = true; 13643 } 13644 } 13645 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13646 } 13647 13648 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13649 // If we are visible, force the DRAWN bit to on so that 13650 // this invalidate will go through (at least to our parent). 13651 // This is because someone may have invalidated this view 13652 // before this call to setFrame came in, thereby clearing 13653 // the DRAWN bit. 13654 mPrivateFlags |= DRAWN; 13655 invalidate(sizeChanged); 13656 // parent display list may need to be recreated based on a change in the bounds 13657 // of any child 13658 invalidateParentCaches(); 13659 } 13660 13661 // Reset drawn bit to original value (invalidate turns it off) 13662 mPrivateFlags |= drawn; 13663 13664 mBackgroundSizeChanged = true; 13665 } 13666 return changed; 13667 } 13668 13669 /** 13670 * Finalize inflating a view from XML. This is called as the last phase 13671 * of inflation, after all child views have been added. 13672 * 13673 * <p>Even if the subclass overrides onFinishInflate, they should always be 13674 * sure to call the super method, so that we get called. 13675 */ 13676 protected void onFinishInflate() { 13677 } 13678 13679 /** 13680 * Returns the resources associated with this view. 13681 * 13682 * @return Resources object. 13683 */ 13684 public Resources getResources() { 13685 return mResources; 13686 } 13687 13688 /** 13689 * Invalidates the specified Drawable. 13690 * 13691 * @param drawable the drawable to invalidate 13692 */ 13693 public void invalidateDrawable(Drawable drawable) { 13694 if (verifyDrawable(drawable)) { 13695 final Rect dirty = drawable.getBounds(); 13696 final int scrollX = mScrollX; 13697 final int scrollY = mScrollY; 13698 13699 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13700 dirty.right + scrollX, dirty.bottom + scrollY); 13701 } 13702 } 13703 13704 /** 13705 * Schedules an action on a drawable to occur at a specified time. 13706 * 13707 * @param who the recipient of the action 13708 * @param what the action to run on the drawable 13709 * @param when the time at which the action must occur. Uses the 13710 * {@link SystemClock#uptimeMillis} timebase. 13711 */ 13712 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13713 if (verifyDrawable(who) && what != null) { 13714 final long delay = when - SystemClock.uptimeMillis(); 13715 if (mAttachInfo != null) { 13716 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13717 Choreographer.CALLBACK_ANIMATION, what, who, 13718 Choreographer.subtractFrameDelay(delay)); 13719 } else { 13720 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13721 } 13722 } 13723 } 13724 13725 /** 13726 * Cancels a scheduled action on a drawable. 13727 * 13728 * @param who the recipient of the action 13729 * @param what the action to cancel 13730 */ 13731 public void unscheduleDrawable(Drawable who, Runnable what) { 13732 if (verifyDrawable(who) && what != null) { 13733 if (mAttachInfo != null) { 13734 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13735 Choreographer.CALLBACK_ANIMATION, what, who); 13736 } else { 13737 ViewRootImpl.getRunQueue().removeCallbacks(what); 13738 } 13739 } 13740 } 13741 13742 /** 13743 * Unschedule any events associated with the given Drawable. This can be 13744 * used when selecting a new Drawable into a view, so that the previous 13745 * one is completely unscheduled. 13746 * 13747 * @param who The Drawable to unschedule. 13748 * 13749 * @see #drawableStateChanged 13750 */ 13751 public void unscheduleDrawable(Drawable who) { 13752 if (mAttachInfo != null && who != null) { 13753 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13754 Choreographer.CALLBACK_ANIMATION, null, who); 13755 } 13756 } 13757 13758 /** 13759 * Return the layout direction of a given Drawable. 13760 * 13761 * @param who the Drawable to query 13762 * @hide 13763 */ 13764 public int getResolvedLayoutDirection(Drawable who) { 13765 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13766 } 13767 13768 /** 13769 * If your view subclass is displaying its own Drawable objects, it should 13770 * override this function and return true for any Drawable it is 13771 * displaying. This allows animations for those drawables to be 13772 * scheduled. 13773 * 13774 * <p>Be sure to call through to the super class when overriding this 13775 * function. 13776 * 13777 * @param who The Drawable to verify. Return true if it is one you are 13778 * displaying, else return the result of calling through to the 13779 * super class. 13780 * 13781 * @return boolean If true than the Drawable is being displayed in the 13782 * view; else false and it is not allowed to animate. 13783 * 13784 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13785 * @see #drawableStateChanged() 13786 */ 13787 protected boolean verifyDrawable(Drawable who) { 13788 return who == mBackground; 13789 } 13790 13791 /** 13792 * This function is called whenever the state of the view changes in such 13793 * a way that it impacts the state of drawables being shown. 13794 * 13795 * <p>Be sure to call through to the superclass when overriding this 13796 * function. 13797 * 13798 * @see Drawable#setState(int[]) 13799 */ 13800 protected void drawableStateChanged() { 13801 Drawable d = mBackground; 13802 if (d != null && d.isStateful()) { 13803 d.setState(getDrawableState()); 13804 } 13805 } 13806 13807 /** 13808 * Call this to force a view to update its drawable state. This will cause 13809 * drawableStateChanged to be called on this view. Views that are interested 13810 * in the new state should call getDrawableState. 13811 * 13812 * @see #drawableStateChanged 13813 * @see #getDrawableState 13814 */ 13815 public void refreshDrawableState() { 13816 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13817 drawableStateChanged(); 13818 13819 ViewParent parent = mParent; 13820 if (parent != null) { 13821 parent.childDrawableStateChanged(this); 13822 } 13823 } 13824 13825 /** 13826 * Return an array of resource IDs of the drawable states representing the 13827 * current state of the view. 13828 * 13829 * @return The current drawable state 13830 * 13831 * @see Drawable#setState(int[]) 13832 * @see #drawableStateChanged() 13833 * @see #onCreateDrawableState(int) 13834 */ 13835 public final int[] getDrawableState() { 13836 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13837 return mDrawableState; 13838 } else { 13839 mDrawableState = onCreateDrawableState(0); 13840 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13841 return mDrawableState; 13842 } 13843 } 13844 13845 /** 13846 * Generate the new {@link android.graphics.drawable.Drawable} state for 13847 * this view. This is called by the view 13848 * system when the cached Drawable state is determined to be invalid. To 13849 * retrieve the current state, you should use {@link #getDrawableState}. 13850 * 13851 * @param extraSpace if non-zero, this is the number of extra entries you 13852 * would like in the returned array in which you can place your own 13853 * states. 13854 * 13855 * @return Returns an array holding the current {@link Drawable} state of 13856 * the view. 13857 * 13858 * @see #mergeDrawableStates(int[], int[]) 13859 */ 13860 protected int[] onCreateDrawableState(int extraSpace) { 13861 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13862 mParent instanceof View) { 13863 return ((View) mParent).onCreateDrawableState(extraSpace); 13864 } 13865 13866 int[] drawableState; 13867 13868 int privateFlags = mPrivateFlags; 13869 13870 int viewStateIndex = 0; 13871 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13872 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13873 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13874 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13875 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13876 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13877 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13878 HardwareRenderer.isAvailable()) { 13879 // This is set if HW acceleration is requested, even if the current 13880 // process doesn't allow it. This is just to allow app preview 13881 // windows to better match their app. 13882 viewStateIndex |= VIEW_STATE_ACCELERATED; 13883 } 13884 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13885 13886 final int privateFlags2 = mPrivateFlags2; 13887 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13888 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13889 13890 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13891 13892 //noinspection ConstantIfStatement 13893 if (false) { 13894 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13895 Log.i("View", toString() 13896 + " pressed=" + ((privateFlags & PRESSED) != 0) 13897 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13898 + " fo=" + hasFocus() 13899 + " sl=" + ((privateFlags & SELECTED) != 0) 13900 + " wf=" + hasWindowFocus() 13901 + ": " + Arrays.toString(drawableState)); 13902 } 13903 13904 if (extraSpace == 0) { 13905 return drawableState; 13906 } 13907 13908 final int[] fullState; 13909 if (drawableState != null) { 13910 fullState = new int[drawableState.length + extraSpace]; 13911 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13912 } else { 13913 fullState = new int[extraSpace]; 13914 } 13915 13916 return fullState; 13917 } 13918 13919 /** 13920 * Merge your own state values in <var>additionalState</var> into the base 13921 * state values <var>baseState</var> that were returned by 13922 * {@link #onCreateDrawableState(int)}. 13923 * 13924 * @param baseState The base state values returned by 13925 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13926 * own additional state values. 13927 * 13928 * @param additionalState The additional state values you would like 13929 * added to <var>baseState</var>; this array is not modified. 13930 * 13931 * @return As a convenience, the <var>baseState</var> array you originally 13932 * passed into the function is returned. 13933 * 13934 * @see #onCreateDrawableState(int) 13935 */ 13936 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13937 final int N = baseState.length; 13938 int i = N - 1; 13939 while (i >= 0 && baseState[i] == 0) { 13940 i--; 13941 } 13942 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13943 return baseState; 13944 } 13945 13946 /** 13947 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13948 * on all Drawable objects associated with this view. 13949 */ 13950 public void jumpDrawablesToCurrentState() { 13951 if (mBackground != null) { 13952 mBackground.jumpToCurrentState(); 13953 } 13954 } 13955 13956 /** 13957 * Sets the background color for this view. 13958 * @param color the color of the background 13959 */ 13960 @RemotableViewMethod 13961 public void setBackgroundColor(int color) { 13962 if (mBackground instanceof ColorDrawable) { 13963 ((ColorDrawable) mBackground).setColor(color); 13964 } else { 13965 setBackground(new ColorDrawable(color)); 13966 } 13967 } 13968 13969 /** 13970 * Set the background to a given resource. The resource should refer to 13971 * a Drawable object or 0 to remove the background. 13972 * @param resid The identifier of the resource. 13973 * 13974 * @attr ref android.R.styleable#View_background 13975 */ 13976 @RemotableViewMethod 13977 public void setBackgroundResource(int resid) { 13978 if (resid != 0 && resid == mBackgroundResource) { 13979 return; 13980 } 13981 13982 Drawable d= null; 13983 if (resid != 0) { 13984 d = mResources.getDrawable(resid); 13985 } 13986 setBackground(d); 13987 13988 mBackgroundResource = resid; 13989 } 13990 13991 /** 13992 * Set the background to a given Drawable, or remove the background. If the 13993 * background has padding, this View's padding is set to the background's 13994 * padding. However, when a background is removed, this View's padding isn't 13995 * touched. If setting the padding is desired, please use 13996 * {@link #setPadding(int, int, int, int)}. 13997 * 13998 * @param background The Drawable to use as the background, or null to remove the 13999 * background 14000 */ 14001 public void setBackground(Drawable background) { 14002 //noinspection deprecation 14003 setBackgroundDrawable(background); 14004 } 14005 14006 /** 14007 * @deprecated use {@link #setBackground(Drawable)} instead 14008 */ 14009 @Deprecated 14010 public void setBackgroundDrawable(Drawable background) { 14011 if (background == mBackground) { 14012 return; 14013 } 14014 14015 boolean requestLayout = false; 14016 14017 mBackgroundResource = 0; 14018 14019 /* 14020 * Regardless of whether we're setting a new background or not, we want 14021 * to clear the previous drawable. 14022 */ 14023 if (mBackground != null) { 14024 mBackground.setCallback(null); 14025 unscheduleDrawable(mBackground); 14026 } 14027 14028 if (background != null) { 14029 Rect padding = sThreadLocal.get(); 14030 if (padding == null) { 14031 padding = new Rect(); 14032 sThreadLocal.set(padding); 14033 } 14034 if (background.getPadding(padding)) { 14035 switch (background.getResolvedLayoutDirectionSelf()) { 14036 case LAYOUT_DIRECTION_RTL: 14037 setPadding(padding.right, padding.top, padding.left, padding.bottom); 14038 break; 14039 case LAYOUT_DIRECTION_LTR: 14040 default: 14041 setPadding(padding.left, padding.top, padding.right, padding.bottom); 14042 } 14043 } 14044 14045 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 14046 // if it has a different minimum size, we should layout again 14047 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 14048 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 14049 requestLayout = true; 14050 } 14051 14052 background.setCallback(this); 14053 if (background.isStateful()) { 14054 background.setState(getDrawableState()); 14055 } 14056 background.setVisible(getVisibility() == VISIBLE, false); 14057 mBackground = background; 14058 14059 if ((mPrivateFlags & SKIP_DRAW) != 0) { 14060 mPrivateFlags &= ~SKIP_DRAW; 14061 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 14062 requestLayout = true; 14063 } 14064 } else { 14065 /* Remove the background */ 14066 mBackground = null; 14067 14068 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 14069 /* 14070 * This view ONLY drew the background before and we're removing 14071 * the background, so now it won't draw anything 14072 * (hence we SKIP_DRAW) 14073 */ 14074 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 14075 mPrivateFlags |= SKIP_DRAW; 14076 } 14077 14078 /* 14079 * When the background is set, we try to apply its padding to this 14080 * View. When the background is removed, we don't touch this View's 14081 * padding. This is noted in the Javadocs. Hence, we don't need to 14082 * requestLayout(), the invalidate() below is sufficient. 14083 */ 14084 14085 // The old background's minimum size could have affected this 14086 // View's layout, so let's requestLayout 14087 requestLayout = true; 14088 } 14089 14090 computeOpaqueFlags(); 14091 14092 if (requestLayout) { 14093 requestLayout(); 14094 } 14095 14096 mBackgroundSizeChanged = true; 14097 invalidate(true); 14098 } 14099 14100 /** 14101 * Gets the background drawable 14102 * 14103 * @return The drawable used as the background for this view, if any. 14104 * 14105 * @see #setBackground(Drawable) 14106 * 14107 * @attr ref android.R.styleable#View_background 14108 */ 14109 public Drawable getBackground() { 14110 return mBackground; 14111 } 14112 14113 /** 14114 * Sets the padding. The view may add on the space required to display 14115 * the scrollbars, depending on the style and visibility of the scrollbars. 14116 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 14117 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 14118 * from the values set in this call. 14119 * 14120 * @attr ref android.R.styleable#View_padding 14121 * @attr ref android.R.styleable#View_paddingBottom 14122 * @attr ref android.R.styleable#View_paddingLeft 14123 * @attr ref android.R.styleable#View_paddingRight 14124 * @attr ref android.R.styleable#View_paddingTop 14125 * @param left the left padding in pixels 14126 * @param top the top padding in pixels 14127 * @param right the right padding in pixels 14128 * @param bottom the bottom padding in pixels 14129 */ 14130 public void setPadding(int left, int top, int right, int bottom) { 14131 mUserPaddingStart = -1; 14132 mUserPaddingEnd = -1; 14133 mUserPaddingRelative = false; 14134 14135 internalSetPadding(left, top, right, bottom); 14136 } 14137 14138 private void internalSetPadding(int left, int top, int right, int bottom) { 14139 mUserPaddingLeft = left; 14140 mUserPaddingRight = right; 14141 mUserPaddingBottom = bottom; 14142 14143 final int viewFlags = mViewFlags; 14144 boolean changed = false; 14145 14146 // Common case is there are no scroll bars. 14147 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 14148 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 14149 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 14150 ? 0 : getVerticalScrollbarWidth(); 14151 switch (mVerticalScrollbarPosition) { 14152 case SCROLLBAR_POSITION_DEFAULT: 14153 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 14154 left += offset; 14155 } else { 14156 right += offset; 14157 } 14158 break; 14159 case SCROLLBAR_POSITION_RIGHT: 14160 right += offset; 14161 break; 14162 case SCROLLBAR_POSITION_LEFT: 14163 left += offset; 14164 break; 14165 } 14166 } 14167 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 14168 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 14169 ? 0 : getHorizontalScrollbarHeight(); 14170 } 14171 } 14172 14173 if (mPaddingLeft != left) { 14174 changed = true; 14175 mPaddingLeft = left; 14176 } 14177 if (mPaddingTop != top) { 14178 changed = true; 14179 mPaddingTop = top; 14180 } 14181 if (mPaddingRight != right) { 14182 changed = true; 14183 mPaddingRight = right; 14184 } 14185 if (mPaddingBottom != bottom) { 14186 changed = true; 14187 mPaddingBottom = bottom; 14188 } 14189 14190 if (changed) { 14191 requestLayout(); 14192 } 14193 } 14194 14195 /** 14196 * Sets the relative padding. The view may add on the space required to display 14197 * the scrollbars, depending on the style and visibility of the scrollbars. 14198 * from the values set in this call. 14199 * 14200 * @param start the start padding in pixels 14201 * @param top the top padding in pixels 14202 * @param end the end padding in pixels 14203 * @param bottom the bottom padding in pixels 14204 * @hide 14205 */ 14206 public void setPaddingRelative(int start, int top, int end, int bottom) { 14207 mUserPaddingStart = start; 14208 mUserPaddingEnd = end; 14209 mUserPaddingRelative = true; 14210 14211 switch(getResolvedLayoutDirection()) { 14212 case LAYOUT_DIRECTION_RTL: 14213 internalSetPadding(end, top, start, bottom); 14214 break; 14215 case LAYOUT_DIRECTION_LTR: 14216 default: 14217 internalSetPadding(start, top, end, bottom); 14218 } 14219 } 14220 14221 /** 14222 * Returns the top padding of this view. 14223 * 14224 * @return the top padding in pixels 14225 */ 14226 public int getPaddingTop() { 14227 return mPaddingTop; 14228 } 14229 14230 /** 14231 * Returns the bottom padding of this view. If there are inset and enabled 14232 * scrollbars, this value may include the space required to display the 14233 * scrollbars as well. 14234 * 14235 * @return the bottom padding in pixels 14236 */ 14237 public int getPaddingBottom() { 14238 return mPaddingBottom; 14239 } 14240 14241 /** 14242 * Returns the left padding of this view. If there are inset and enabled 14243 * scrollbars, this value may include the space required to display the 14244 * scrollbars as well. 14245 * 14246 * @return the left padding in pixels 14247 */ 14248 public int getPaddingLeft() { 14249 return mPaddingLeft; 14250 } 14251 14252 /** 14253 * Returns the start padding of this view depending on its resolved layout direction. 14254 * If there are inset and enabled scrollbars, this value may include the space 14255 * required to display the scrollbars as well. 14256 * 14257 * @return the start padding in pixels 14258 * @hide 14259 */ 14260 public int getPaddingStart() { 14261 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14262 mPaddingRight : mPaddingLeft; 14263 } 14264 14265 /** 14266 * Returns the right padding of this view. If there are inset and enabled 14267 * scrollbars, this value may include the space required to display the 14268 * scrollbars as well. 14269 * 14270 * @return the right padding in pixels 14271 */ 14272 public int getPaddingRight() { 14273 return mPaddingRight; 14274 } 14275 14276 /** 14277 * Returns the end padding of this view depending on its resolved layout direction. 14278 * If there are inset and enabled scrollbars, this value may include the space 14279 * required to display the scrollbars as well. 14280 * 14281 * @return the end padding in pixels 14282 * @hide 14283 */ 14284 public int getPaddingEnd() { 14285 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 14286 mPaddingLeft : mPaddingRight; 14287 } 14288 14289 /** 14290 * Return if the padding as been set thru relative values 14291 * {@link #setPaddingRelative(int, int, int, int)} 14292 * 14293 * @return true if the padding is relative or false if it is not. 14294 * @hide 14295 */ 14296 public boolean isPaddingRelative() { 14297 return mUserPaddingRelative; 14298 } 14299 14300 /** 14301 * @hide 14302 */ 14303 public Insets getOpticalInsets() { 14304 if (mLayoutInsets == null) { 14305 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 14306 } 14307 return mLayoutInsets; 14308 } 14309 14310 /** 14311 * @hide 14312 */ 14313 public void setLayoutInsets(Insets layoutInsets) { 14314 mLayoutInsets = layoutInsets; 14315 } 14316 14317 /** 14318 * Changes the selection state of this view. A view can be selected or not. 14319 * Note that selection is not the same as focus. Views are typically 14320 * selected in the context of an AdapterView like ListView or GridView; 14321 * the selected view is the view that is highlighted. 14322 * 14323 * @param selected true if the view must be selected, false otherwise 14324 */ 14325 public void setSelected(boolean selected) { 14326 if (((mPrivateFlags & SELECTED) != 0) != selected) { 14327 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 14328 if (!selected) resetPressedState(); 14329 invalidate(true); 14330 refreshDrawableState(); 14331 dispatchSetSelected(selected); 14332 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 14333 notifyAccessibilityStateChanged(); 14334 } 14335 } 14336 } 14337 14338 /** 14339 * Dispatch setSelected to all of this View's children. 14340 * 14341 * @see #setSelected(boolean) 14342 * 14343 * @param selected The new selected state 14344 */ 14345 protected void dispatchSetSelected(boolean selected) { 14346 } 14347 14348 /** 14349 * Indicates the selection state of this view. 14350 * 14351 * @return true if the view is selected, false otherwise 14352 */ 14353 @ViewDebug.ExportedProperty 14354 public boolean isSelected() { 14355 return (mPrivateFlags & SELECTED) != 0; 14356 } 14357 14358 /** 14359 * Changes the activated state of this view. A view can be activated or not. 14360 * Note that activation is not the same as selection. Selection is 14361 * a transient property, representing the view (hierarchy) the user is 14362 * currently interacting with. Activation is a longer-term state that the 14363 * user can move views in and out of. For example, in a list view with 14364 * single or multiple selection enabled, the views in the current selection 14365 * set are activated. (Um, yeah, we are deeply sorry about the terminology 14366 * here.) The activated state is propagated down to children of the view it 14367 * is set on. 14368 * 14369 * @param activated true if the view must be activated, false otherwise 14370 */ 14371 public void setActivated(boolean activated) { 14372 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 14373 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 14374 invalidate(true); 14375 refreshDrawableState(); 14376 dispatchSetActivated(activated); 14377 } 14378 } 14379 14380 /** 14381 * Dispatch setActivated to all of this View's children. 14382 * 14383 * @see #setActivated(boolean) 14384 * 14385 * @param activated The new activated state 14386 */ 14387 protected void dispatchSetActivated(boolean activated) { 14388 } 14389 14390 /** 14391 * Indicates the activation state of this view. 14392 * 14393 * @return true if the view is activated, false otherwise 14394 */ 14395 @ViewDebug.ExportedProperty 14396 public boolean isActivated() { 14397 return (mPrivateFlags & ACTIVATED) != 0; 14398 } 14399 14400 /** 14401 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14402 * observer can be used to get notifications when global events, like 14403 * layout, happen. 14404 * 14405 * The returned ViewTreeObserver observer is not guaranteed to remain 14406 * valid for the lifetime of this View. If the caller of this method keeps 14407 * a long-lived reference to ViewTreeObserver, it should always check for 14408 * the return value of {@link ViewTreeObserver#isAlive()}. 14409 * 14410 * @return The ViewTreeObserver for this view's hierarchy. 14411 */ 14412 public ViewTreeObserver getViewTreeObserver() { 14413 if (mAttachInfo != null) { 14414 return mAttachInfo.mTreeObserver; 14415 } 14416 if (mFloatingTreeObserver == null) { 14417 mFloatingTreeObserver = new ViewTreeObserver(); 14418 } 14419 return mFloatingTreeObserver; 14420 } 14421 14422 /** 14423 * <p>Finds the topmost view in the current view hierarchy.</p> 14424 * 14425 * @return the topmost view containing this view 14426 */ 14427 public View getRootView() { 14428 if (mAttachInfo != null) { 14429 final View v = mAttachInfo.mRootView; 14430 if (v != null) { 14431 return v; 14432 } 14433 } 14434 14435 View parent = this; 14436 14437 while (parent.mParent != null && parent.mParent instanceof View) { 14438 parent = (View) parent.mParent; 14439 } 14440 14441 return parent; 14442 } 14443 14444 /** 14445 * <p>Computes the coordinates of this view on the screen. The argument 14446 * must be an array of two integers. After the method returns, the array 14447 * contains the x and y location in that order.</p> 14448 * 14449 * @param location an array of two integers in which to hold the coordinates 14450 */ 14451 public void getLocationOnScreen(int[] location) { 14452 getLocationInWindow(location); 14453 14454 final AttachInfo info = mAttachInfo; 14455 if (info != null) { 14456 location[0] += info.mWindowLeft; 14457 location[1] += info.mWindowTop; 14458 } 14459 } 14460 14461 /** 14462 * <p>Computes the coordinates of this view in its window. The argument 14463 * must be an array of two integers. After the method returns, the array 14464 * contains the x and y location in that order.</p> 14465 * 14466 * @param location an array of two integers in which to hold the coordinates 14467 */ 14468 public void getLocationInWindow(int[] location) { 14469 if (location == null || location.length < 2) { 14470 throw new IllegalArgumentException("location must be an array of two integers"); 14471 } 14472 14473 if (mAttachInfo == null) { 14474 // When the view is not attached to a window, this method does not make sense 14475 location[0] = location[1] = 0; 14476 return; 14477 } 14478 14479 float[] position = mAttachInfo.mTmpTransformLocation; 14480 position[0] = position[1] = 0.0f; 14481 14482 if (!hasIdentityMatrix()) { 14483 getMatrix().mapPoints(position); 14484 } 14485 14486 position[0] += mLeft; 14487 position[1] += mTop; 14488 14489 ViewParent viewParent = mParent; 14490 while (viewParent instanceof View) { 14491 final View view = (View) viewParent; 14492 14493 position[0] -= view.mScrollX; 14494 position[1] -= view.mScrollY; 14495 14496 if (!view.hasIdentityMatrix()) { 14497 view.getMatrix().mapPoints(position); 14498 } 14499 14500 position[0] += view.mLeft; 14501 position[1] += view.mTop; 14502 14503 viewParent = view.mParent; 14504 } 14505 14506 if (viewParent instanceof ViewRootImpl) { 14507 // *cough* 14508 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14509 position[1] -= vr.mCurScrollY; 14510 } 14511 14512 location[0] = (int) (position[0] + 0.5f); 14513 location[1] = (int) (position[1] + 0.5f); 14514 } 14515 14516 /** 14517 * {@hide} 14518 * @param id the id of the view to be found 14519 * @return the view of the specified id, null if cannot be found 14520 */ 14521 protected View findViewTraversal(int id) { 14522 if (id == mID) { 14523 return this; 14524 } 14525 return null; 14526 } 14527 14528 /** 14529 * {@hide} 14530 * @param tag the tag of the view to be found 14531 * @return the view of specified tag, null if cannot be found 14532 */ 14533 protected View findViewWithTagTraversal(Object tag) { 14534 if (tag != null && tag.equals(mTag)) { 14535 return this; 14536 } 14537 return null; 14538 } 14539 14540 /** 14541 * {@hide} 14542 * @param predicate The predicate to evaluate. 14543 * @param childToSkip If not null, ignores this child during the recursive traversal. 14544 * @return The first view that matches the predicate or null. 14545 */ 14546 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14547 if (predicate.apply(this)) { 14548 return this; 14549 } 14550 return null; 14551 } 14552 14553 /** 14554 * Look for a child view with the given id. If this view has the given 14555 * id, return this view. 14556 * 14557 * @param id The id to search for. 14558 * @return The view that has the given id in the hierarchy or null 14559 */ 14560 public final View findViewById(int id) { 14561 if (id < 0) { 14562 return null; 14563 } 14564 return findViewTraversal(id); 14565 } 14566 14567 /** 14568 * Finds a view by its unuque and stable accessibility id. 14569 * 14570 * @param accessibilityId The searched accessibility id. 14571 * @return The found view. 14572 */ 14573 final View findViewByAccessibilityId(int accessibilityId) { 14574 if (accessibilityId < 0) { 14575 return null; 14576 } 14577 return findViewByAccessibilityIdTraversal(accessibilityId); 14578 } 14579 14580 /** 14581 * Performs the traversal to find a view by its unuque and stable accessibility id. 14582 * 14583 * <strong>Note:</strong>This method does not stop at the root namespace 14584 * boundary since the user can touch the screen at an arbitrary location 14585 * potentially crossing the root namespace bounday which will send an 14586 * accessibility event to accessibility services and they should be able 14587 * to obtain the event source. Also accessibility ids are guaranteed to be 14588 * unique in the window. 14589 * 14590 * @param accessibilityId The accessibility id. 14591 * @return The found view. 14592 */ 14593 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14594 if (getAccessibilityViewId() == accessibilityId) { 14595 return this; 14596 } 14597 return null; 14598 } 14599 14600 /** 14601 * Look for a child view with the given tag. If this view has the given 14602 * tag, return this view. 14603 * 14604 * @param tag The tag to search for, using "tag.equals(getTag())". 14605 * @return The View that has the given tag in the hierarchy or null 14606 */ 14607 public final View findViewWithTag(Object tag) { 14608 if (tag == null) { 14609 return null; 14610 } 14611 return findViewWithTagTraversal(tag); 14612 } 14613 14614 /** 14615 * {@hide} 14616 * Look for a child view that matches the specified predicate. 14617 * If this view matches the predicate, return this view. 14618 * 14619 * @param predicate The predicate to evaluate. 14620 * @return The first view that matches the predicate or null. 14621 */ 14622 public final View findViewByPredicate(Predicate<View> predicate) { 14623 return findViewByPredicateTraversal(predicate, null); 14624 } 14625 14626 /** 14627 * {@hide} 14628 * Look for a child view that matches the specified predicate, 14629 * starting with the specified view and its descendents and then 14630 * recusively searching the ancestors and siblings of that view 14631 * until this view is reached. 14632 * 14633 * This method is useful in cases where the predicate does not match 14634 * a single unique view (perhaps multiple views use the same id) 14635 * and we are trying to find the view that is "closest" in scope to the 14636 * starting view. 14637 * 14638 * @param start The view to start from. 14639 * @param predicate The predicate to evaluate. 14640 * @return The first view that matches the predicate or null. 14641 */ 14642 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14643 View childToSkip = null; 14644 for (;;) { 14645 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14646 if (view != null || start == this) { 14647 return view; 14648 } 14649 14650 ViewParent parent = start.getParent(); 14651 if (parent == null || !(parent instanceof View)) { 14652 return null; 14653 } 14654 14655 childToSkip = start; 14656 start = (View) parent; 14657 } 14658 } 14659 14660 /** 14661 * Sets the identifier for this view. The identifier does not have to be 14662 * unique in this view's hierarchy. The identifier should be a positive 14663 * number. 14664 * 14665 * @see #NO_ID 14666 * @see #getId() 14667 * @see #findViewById(int) 14668 * 14669 * @param id a number used to identify the view 14670 * 14671 * @attr ref android.R.styleable#View_id 14672 */ 14673 public void setId(int id) { 14674 mID = id; 14675 } 14676 14677 /** 14678 * {@hide} 14679 * 14680 * @param isRoot true if the view belongs to the root namespace, false 14681 * otherwise 14682 */ 14683 public void setIsRootNamespace(boolean isRoot) { 14684 if (isRoot) { 14685 mPrivateFlags |= IS_ROOT_NAMESPACE; 14686 } else { 14687 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14688 } 14689 } 14690 14691 /** 14692 * {@hide} 14693 * 14694 * @return true if the view belongs to the root namespace, false otherwise 14695 */ 14696 public boolean isRootNamespace() { 14697 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14698 } 14699 14700 /** 14701 * Returns this view's identifier. 14702 * 14703 * @return a positive integer used to identify the view or {@link #NO_ID} 14704 * if the view has no ID 14705 * 14706 * @see #setId(int) 14707 * @see #findViewById(int) 14708 * @attr ref android.R.styleable#View_id 14709 */ 14710 @ViewDebug.CapturedViewProperty 14711 public int getId() { 14712 return mID; 14713 } 14714 14715 /** 14716 * Returns this view's tag. 14717 * 14718 * @return the Object stored in this view as a tag 14719 * 14720 * @see #setTag(Object) 14721 * @see #getTag(int) 14722 */ 14723 @ViewDebug.ExportedProperty 14724 public Object getTag() { 14725 return mTag; 14726 } 14727 14728 /** 14729 * Sets the tag associated with this view. A tag can be used to mark 14730 * a view in its hierarchy and does not have to be unique within the 14731 * hierarchy. Tags can also be used to store data within a view without 14732 * resorting to another data structure. 14733 * 14734 * @param tag an Object to tag the view with 14735 * 14736 * @see #getTag() 14737 * @see #setTag(int, Object) 14738 */ 14739 public void setTag(final Object tag) { 14740 mTag = tag; 14741 } 14742 14743 /** 14744 * Returns the tag associated with this view and the specified key. 14745 * 14746 * @param key The key identifying the tag 14747 * 14748 * @return the Object stored in this view as a tag 14749 * 14750 * @see #setTag(int, Object) 14751 * @see #getTag() 14752 */ 14753 public Object getTag(int key) { 14754 if (mKeyedTags != null) return mKeyedTags.get(key); 14755 return null; 14756 } 14757 14758 /** 14759 * Sets a tag associated with this view and a key. A tag can be used 14760 * to mark a view in its hierarchy and does not have to be unique within 14761 * the hierarchy. Tags can also be used to store data within a view 14762 * without resorting to another data structure. 14763 * 14764 * The specified key should be an id declared in the resources of the 14765 * application to ensure it is unique (see the <a 14766 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14767 * Keys identified as belonging to 14768 * the Android framework or not associated with any package will cause 14769 * an {@link IllegalArgumentException} to be thrown. 14770 * 14771 * @param key The key identifying the tag 14772 * @param tag An Object to tag the view with 14773 * 14774 * @throws IllegalArgumentException If they specified key is not valid 14775 * 14776 * @see #setTag(Object) 14777 * @see #getTag(int) 14778 */ 14779 public void setTag(int key, final Object tag) { 14780 // If the package id is 0x00 or 0x01, it's either an undefined package 14781 // or a framework id 14782 if ((key >>> 24) < 2) { 14783 throw new IllegalArgumentException("The key must be an application-specific " 14784 + "resource id."); 14785 } 14786 14787 setKeyedTag(key, tag); 14788 } 14789 14790 /** 14791 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14792 * framework id. 14793 * 14794 * @hide 14795 */ 14796 public void setTagInternal(int key, Object tag) { 14797 if ((key >>> 24) != 0x1) { 14798 throw new IllegalArgumentException("The key must be a framework-specific " 14799 + "resource id."); 14800 } 14801 14802 setKeyedTag(key, tag); 14803 } 14804 14805 private void setKeyedTag(int key, Object tag) { 14806 if (mKeyedTags == null) { 14807 mKeyedTags = new SparseArray<Object>(); 14808 } 14809 14810 mKeyedTags.put(key, tag); 14811 } 14812 14813 /** 14814 * @param consistency The type of consistency. See ViewDebug for more information. 14815 * 14816 * @hide 14817 */ 14818 protected boolean dispatchConsistencyCheck(int consistency) { 14819 return onConsistencyCheck(consistency); 14820 } 14821 14822 /** 14823 * Method that subclasses should implement to check their consistency. The type of 14824 * consistency check is indicated by the bit field passed as a parameter. 14825 * 14826 * @param consistency The type of consistency. See ViewDebug for more information. 14827 * 14828 * @throws IllegalStateException if the view is in an inconsistent state. 14829 * 14830 * @hide 14831 */ 14832 protected boolean onConsistencyCheck(int consistency) { 14833 boolean result = true; 14834 14835 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14836 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14837 14838 if (checkLayout) { 14839 if (getParent() == null) { 14840 result = false; 14841 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14842 "View " + this + " does not have a parent."); 14843 } 14844 14845 if (mAttachInfo == null) { 14846 result = false; 14847 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14848 "View " + this + " is not attached to a window."); 14849 } 14850 } 14851 14852 if (checkDrawing) { 14853 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14854 // from their draw() method 14855 14856 if ((mPrivateFlags & DRAWN) != DRAWN && 14857 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14858 result = false; 14859 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14860 "View " + this + " was invalidated but its drawing cache is valid."); 14861 } 14862 } 14863 14864 return result; 14865 } 14866 14867 /** 14868 * Prints information about this view in the log output, with the tag 14869 * {@link #VIEW_LOG_TAG}. 14870 * 14871 * @hide 14872 */ 14873 public void debug() { 14874 debug(0); 14875 } 14876 14877 /** 14878 * Prints information about this view in the log output, with the tag 14879 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14880 * indentation defined by the <code>depth</code>. 14881 * 14882 * @param depth the indentation level 14883 * 14884 * @hide 14885 */ 14886 protected void debug(int depth) { 14887 String output = debugIndent(depth - 1); 14888 14889 output += "+ " + this; 14890 int id = getId(); 14891 if (id != -1) { 14892 output += " (id=" + id + ")"; 14893 } 14894 Object tag = getTag(); 14895 if (tag != null) { 14896 output += " (tag=" + tag + ")"; 14897 } 14898 Log.d(VIEW_LOG_TAG, output); 14899 14900 if ((mPrivateFlags & FOCUSED) != 0) { 14901 output = debugIndent(depth) + " FOCUSED"; 14902 Log.d(VIEW_LOG_TAG, output); 14903 } 14904 14905 output = debugIndent(depth); 14906 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14907 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14908 + "} "; 14909 Log.d(VIEW_LOG_TAG, output); 14910 14911 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14912 || mPaddingBottom != 0) { 14913 output = debugIndent(depth); 14914 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14915 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14916 Log.d(VIEW_LOG_TAG, output); 14917 } 14918 14919 output = debugIndent(depth); 14920 output += "mMeasureWidth=" + mMeasuredWidth + 14921 " mMeasureHeight=" + mMeasuredHeight; 14922 Log.d(VIEW_LOG_TAG, output); 14923 14924 output = debugIndent(depth); 14925 if (mLayoutParams == null) { 14926 output += "BAD! no layout params"; 14927 } else { 14928 output = mLayoutParams.debug(output); 14929 } 14930 Log.d(VIEW_LOG_TAG, output); 14931 14932 output = debugIndent(depth); 14933 output += "flags={"; 14934 output += View.printFlags(mViewFlags); 14935 output += "}"; 14936 Log.d(VIEW_LOG_TAG, output); 14937 14938 output = debugIndent(depth); 14939 output += "privateFlags={"; 14940 output += View.printPrivateFlags(mPrivateFlags); 14941 output += "}"; 14942 Log.d(VIEW_LOG_TAG, output); 14943 } 14944 14945 /** 14946 * Creates a string of whitespaces used for indentation. 14947 * 14948 * @param depth the indentation level 14949 * @return a String containing (depth * 2 + 3) * 2 white spaces 14950 * 14951 * @hide 14952 */ 14953 protected static String debugIndent(int depth) { 14954 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14955 for (int i = 0; i < (depth * 2) + 3; i++) { 14956 spaces.append(' ').append(' '); 14957 } 14958 return spaces.toString(); 14959 } 14960 14961 /** 14962 * <p>Return the offset of the widget's text baseline from the widget's top 14963 * boundary. If this widget does not support baseline alignment, this 14964 * method returns -1. </p> 14965 * 14966 * @return the offset of the baseline within the widget's bounds or -1 14967 * if baseline alignment is not supported 14968 */ 14969 @ViewDebug.ExportedProperty(category = "layout") 14970 public int getBaseline() { 14971 return -1; 14972 } 14973 14974 /** 14975 * Call this when something has changed which has invalidated the 14976 * layout of this view. This will schedule a layout pass of the view 14977 * tree. 14978 */ 14979 public void requestLayout() { 14980 if (ViewDebug.TRACE_HIERARCHY) { 14981 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14982 } 14983 14984 mPrivateFlags |= FORCE_LAYOUT; 14985 mPrivateFlags |= INVALIDATED; 14986 14987 if (mLayoutParams != null) { 14988 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14989 } 14990 14991 if (mParent != null && !mParent.isLayoutRequested()) { 14992 mParent.requestLayout(); 14993 } 14994 } 14995 14996 /** 14997 * Forces this view to be laid out during the next layout pass. 14998 * This method does not call requestLayout() or forceLayout() 14999 * on the parent. 15000 */ 15001 public void forceLayout() { 15002 mPrivateFlags |= FORCE_LAYOUT; 15003 mPrivateFlags |= INVALIDATED; 15004 } 15005 15006 /** 15007 * <p> 15008 * This is called to find out how big a view should be. The parent 15009 * supplies constraint information in the width and height parameters. 15010 * </p> 15011 * 15012 * <p> 15013 * The actual measurement work of a view is performed in 15014 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 15015 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 15016 * </p> 15017 * 15018 * 15019 * @param widthMeasureSpec Horizontal space requirements as imposed by the 15020 * parent 15021 * @param heightMeasureSpec Vertical space requirements as imposed by the 15022 * parent 15023 * 15024 * @see #onMeasure(int, int) 15025 */ 15026 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 15027 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 15028 widthMeasureSpec != mOldWidthMeasureSpec || 15029 heightMeasureSpec != mOldHeightMeasureSpec) { 15030 15031 // first clears the measured dimension flag 15032 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 15033 15034 if (ViewDebug.TRACE_HIERARCHY) { 15035 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 15036 } 15037 15038 // measure ourselves, this should set the measured dimension flag back 15039 onMeasure(widthMeasureSpec, heightMeasureSpec); 15040 15041 // flag not set, setMeasuredDimension() was not invoked, we raise 15042 // an exception to warn the developer 15043 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 15044 throw new IllegalStateException("onMeasure() did not set the" 15045 + " measured dimension by calling" 15046 + " setMeasuredDimension()"); 15047 } 15048 15049 mPrivateFlags |= LAYOUT_REQUIRED; 15050 } 15051 15052 mOldWidthMeasureSpec = widthMeasureSpec; 15053 mOldHeightMeasureSpec = heightMeasureSpec; 15054 } 15055 15056 /** 15057 * <p> 15058 * Measure the view and its content to determine the measured width and the 15059 * measured height. This method is invoked by {@link #measure(int, int)} and 15060 * should be overriden by subclasses to provide accurate and efficient 15061 * measurement of their contents. 15062 * </p> 15063 * 15064 * <p> 15065 * <strong>CONTRACT:</strong> When overriding this method, you 15066 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 15067 * measured width and height of this view. Failure to do so will trigger an 15068 * <code>IllegalStateException</code>, thrown by 15069 * {@link #measure(int, int)}. Calling the superclass' 15070 * {@link #onMeasure(int, int)} is a valid use. 15071 * </p> 15072 * 15073 * <p> 15074 * The base class implementation of measure defaults to the background size, 15075 * unless a larger size is allowed by the MeasureSpec. Subclasses should 15076 * override {@link #onMeasure(int, int)} to provide better measurements of 15077 * their content. 15078 * </p> 15079 * 15080 * <p> 15081 * If this method is overridden, it is the subclass's responsibility to make 15082 * sure the measured height and width are at least the view's minimum height 15083 * and width ({@link #getSuggestedMinimumHeight()} and 15084 * {@link #getSuggestedMinimumWidth()}). 15085 * </p> 15086 * 15087 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 15088 * The requirements are encoded with 15089 * {@link android.view.View.MeasureSpec}. 15090 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 15091 * The requirements are encoded with 15092 * {@link android.view.View.MeasureSpec}. 15093 * 15094 * @see #getMeasuredWidth() 15095 * @see #getMeasuredHeight() 15096 * @see #setMeasuredDimension(int, int) 15097 * @see #getSuggestedMinimumHeight() 15098 * @see #getSuggestedMinimumWidth() 15099 * @see android.view.View.MeasureSpec#getMode(int) 15100 * @see android.view.View.MeasureSpec#getSize(int) 15101 */ 15102 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 15103 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 15104 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 15105 } 15106 15107 /** 15108 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 15109 * measured width and measured height. Failing to do so will trigger an 15110 * exception at measurement time.</p> 15111 * 15112 * @param measuredWidth The measured width of this view. May be a complex 15113 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15114 * {@link #MEASURED_STATE_TOO_SMALL}. 15115 * @param measuredHeight The measured height of this view. May be a complex 15116 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 15117 * {@link #MEASURED_STATE_TOO_SMALL}. 15118 */ 15119 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 15120 mMeasuredWidth = measuredWidth; 15121 mMeasuredHeight = measuredHeight; 15122 15123 mPrivateFlags |= MEASURED_DIMENSION_SET; 15124 } 15125 15126 /** 15127 * Merge two states as returned by {@link #getMeasuredState()}. 15128 * @param curState The current state as returned from a view or the result 15129 * of combining multiple views. 15130 * @param newState The new view state to combine. 15131 * @return Returns a new integer reflecting the combination of the two 15132 * states. 15133 */ 15134 public static int combineMeasuredStates(int curState, int newState) { 15135 return curState | newState; 15136 } 15137 15138 /** 15139 * Version of {@link #resolveSizeAndState(int, int, int)} 15140 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 15141 */ 15142 public static int resolveSize(int size, int measureSpec) { 15143 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 15144 } 15145 15146 /** 15147 * Utility to reconcile a desired size and state, with constraints imposed 15148 * by a MeasureSpec. Will take the desired size, unless a different size 15149 * is imposed by the constraints. The returned value is a compound integer, 15150 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 15151 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 15152 * size is smaller than the size the view wants to be. 15153 * 15154 * @param size How big the view wants to be 15155 * @param measureSpec Constraints imposed by the parent 15156 * @return Size information bit mask as defined by 15157 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 15158 */ 15159 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 15160 int result = size; 15161 int specMode = MeasureSpec.getMode(measureSpec); 15162 int specSize = MeasureSpec.getSize(measureSpec); 15163 switch (specMode) { 15164 case MeasureSpec.UNSPECIFIED: 15165 result = size; 15166 break; 15167 case MeasureSpec.AT_MOST: 15168 if (specSize < size) { 15169 result = specSize | MEASURED_STATE_TOO_SMALL; 15170 } else { 15171 result = size; 15172 } 15173 break; 15174 case MeasureSpec.EXACTLY: 15175 result = specSize; 15176 break; 15177 } 15178 return result | (childMeasuredState&MEASURED_STATE_MASK); 15179 } 15180 15181 /** 15182 * Utility to return a default size. Uses the supplied size if the 15183 * MeasureSpec imposed no constraints. Will get larger if allowed 15184 * by the MeasureSpec. 15185 * 15186 * @param size Default size for this view 15187 * @param measureSpec Constraints imposed by the parent 15188 * @return The size this view should be. 15189 */ 15190 public static int getDefaultSize(int size, int measureSpec) { 15191 int result = size; 15192 int specMode = MeasureSpec.getMode(measureSpec); 15193 int specSize = MeasureSpec.getSize(measureSpec); 15194 15195 switch (specMode) { 15196 case MeasureSpec.UNSPECIFIED: 15197 result = size; 15198 break; 15199 case MeasureSpec.AT_MOST: 15200 case MeasureSpec.EXACTLY: 15201 result = specSize; 15202 break; 15203 } 15204 return result; 15205 } 15206 15207 /** 15208 * Returns the suggested minimum height that the view should use. This 15209 * returns the maximum of the view's minimum height 15210 * and the background's minimum height 15211 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 15212 * <p> 15213 * When being used in {@link #onMeasure(int, int)}, the caller should still 15214 * ensure the returned height is within the requirements of the parent. 15215 * 15216 * @return The suggested minimum height of the view. 15217 */ 15218 protected int getSuggestedMinimumHeight() { 15219 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 15220 15221 } 15222 15223 /** 15224 * Returns the suggested minimum width that the view should use. This 15225 * returns the maximum of the view's minimum width) 15226 * and the background's minimum width 15227 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 15228 * <p> 15229 * When being used in {@link #onMeasure(int, int)}, the caller should still 15230 * ensure the returned width is within the requirements of the parent. 15231 * 15232 * @return The suggested minimum width of the view. 15233 */ 15234 protected int getSuggestedMinimumWidth() { 15235 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 15236 } 15237 15238 /** 15239 * Returns the minimum height of the view. 15240 * 15241 * @return the minimum height the view will try to be. 15242 * 15243 * @see #setMinimumHeight(int) 15244 * 15245 * @attr ref android.R.styleable#View_minHeight 15246 */ 15247 public int getMinimumHeight() { 15248 return mMinHeight; 15249 } 15250 15251 /** 15252 * Sets the minimum height of the view. It is not guaranteed the view will 15253 * be able to achieve this minimum height (for example, if its parent layout 15254 * constrains it with less available height). 15255 * 15256 * @param minHeight The minimum height the view will try to be. 15257 * 15258 * @see #getMinimumHeight() 15259 * 15260 * @attr ref android.R.styleable#View_minHeight 15261 */ 15262 public void setMinimumHeight(int minHeight) { 15263 mMinHeight = minHeight; 15264 requestLayout(); 15265 } 15266 15267 /** 15268 * Returns the minimum width of the view. 15269 * 15270 * @return the minimum width the view will try to be. 15271 * 15272 * @see #setMinimumWidth(int) 15273 * 15274 * @attr ref android.R.styleable#View_minWidth 15275 */ 15276 public int getMinimumWidth() { 15277 return mMinWidth; 15278 } 15279 15280 /** 15281 * Sets the minimum width of the view. It is not guaranteed the view will 15282 * be able to achieve this minimum width (for example, if its parent layout 15283 * constrains it with less available width). 15284 * 15285 * @param minWidth The minimum width the view will try to be. 15286 * 15287 * @see #getMinimumWidth() 15288 * 15289 * @attr ref android.R.styleable#View_minWidth 15290 */ 15291 public void setMinimumWidth(int minWidth) { 15292 mMinWidth = minWidth; 15293 requestLayout(); 15294 15295 } 15296 15297 /** 15298 * Get the animation currently associated with this view. 15299 * 15300 * @return The animation that is currently playing or 15301 * scheduled to play for this view. 15302 */ 15303 public Animation getAnimation() { 15304 return mCurrentAnimation; 15305 } 15306 15307 /** 15308 * Start the specified animation now. 15309 * 15310 * @param animation the animation to start now 15311 */ 15312 public void startAnimation(Animation animation) { 15313 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 15314 setAnimation(animation); 15315 invalidateParentCaches(); 15316 invalidate(true); 15317 } 15318 15319 /** 15320 * Cancels any animations for this view. 15321 */ 15322 public void clearAnimation() { 15323 if (mCurrentAnimation != null) { 15324 mCurrentAnimation.detach(); 15325 } 15326 mCurrentAnimation = null; 15327 invalidateParentIfNeeded(); 15328 } 15329 15330 /** 15331 * Sets the next animation to play for this view. 15332 * If you want the animation to play immediately, use 15333 * {@link #startAnimation(android.view.animation.Animation)} instead. 15334 * This method provides allows fine-grained 15335 * control over the start time and invalidation, but you 15336 * must make sure that 1) the animation has a start time set, and 15337 * 2) the view's parent (which controls animations on its children) 15338 * will be invalidated when the animation is supposed to 15339 * start. 15340 * 15341 * @param animation The next animation, or null. 15342 */ 15343 public void setAnimation(Animation animation) { 15344 mCurrentAnimation = animation; 15345 15346 if (animation != null) { 15347 // If the screen is off assume the animation start time is now instead of 15348 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 15349 // would cause the animation to start when the screen turns back on 15350 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 15351 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 15352 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 15353 } 15354 animation.reset(); 15355 } 15356 } 15357 15358 /** 15359 * Invoked by a parent ViewGroup to notify the start of the animation 15360 * currently associated with this view. If you override this method, 15361 * always call super.onAnimationStart(); 15362 * 15363 * @see #setAnimation(android.view.animation.Animation) 15364 * @see #getAnimation() 15365 */ 15366 protected void onAnimationStart() { 15367 mPrivateFlags |= ANIMATION_STARTED; 15368 } 15369 15370 /** 15371 * Invoked by a parent ViewGroup to notify the end of the animation 15372 * currently associated with this view. If you override this method, 15373 * always call super.onAnimationEnd(); 15374 * 15375 * @see #setAnimation(android.view.animation.Animation) 15376 * @see #getAnimation() 15377 */ 15378 protected void onAnimationEnd() { 15379 mPrivateFlags &= ~ANIMATION_STARTED; 15380 } 15381 15382 /** 15383 * Invoked if there is a Transform that involves alpha. Subclass that can 15384 * draw themselves with the specified alpha should return true, and then 15385 * respect that alpha when their onDraw() is called. If this returns false 15386 * then the view may be redirected to draw into an offscreen buffer to 15387 * fulfill the request, which will look fine, but may be slower than if the 15388 * subclass handles it internally. The default implementation returns false. 15389 * 15390 * @param alpha The alpha (0..255) to apply to the view's drawing 15391 * @return true if the view can draw with the specified alpha. 15392 */ 15393 protected boolean onSetAlpha(int alpha) { 15394 return false; 15395 } 15396 15397 /** 15398 * This is used by the RootView to perform an optimization when 15399 * the view hierarchy contains one or several SurfaceView. 15400 * SurfaceView is always considered transparent, but its children are not, 15401 * therefore all View objects remove themselves from the global transparent 15402 * region (passed as a parameter to this function). 15403 * 15404 * @param region The transparent region for this ViewAncestor (window). 15405 * 15406 * @return Returns true if the effective visibility of the view at this 15407 * point is opaque, regardless of the transparent region; returns false 15408 * if it is possible for underlying windows to be seen behind the view. 15409 * 15410 * {@hide} 15411 */ 15412 public boolean gatherTransparentRegion(Region region) { 15413 final AttachInfo attachInfo = mAttachInfo; 15414 if (region != null && attachInfo != null) { 15415 final int pflags = mPrivateFlags; 15416 if ((pflags & SKIP_DRAW) == 0) { 15417 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15418 // remove it from the transparent region. 15419 final int[] location = attachInfo.mTransparentLocation; 15420 getLocationInWindow(location); 15421 region.op(location[0], location[1], location[0] + mRight - mLeft, 15422 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15423 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15424 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15425 // exists, so we remove the background drawable's non-transparent 15426 // parts from this transparent region. 15427 applyDrawableToTransparentRegion(mBackground, region); 15428 } 15429 } 15430 return true; 15431 } 15432 15433 /** 15434 * Play a sound effect for this view. 15435 * 15436 * <p>The framework will play sound effects for some built in actions, such as 15437 * clicking, but you may wish to play these effects in your widget, 15438 * for instance, for internal navigation. 15439 * 15440 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15441 * {@link #isSoundEffectsEnabled()} is true. 15442 * 15443 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15444 */ 15445 public void playSoundEffect(int soundConstant) { 15446 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15447 return; 15448 } 15449 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15450 } 15451 15452 /** 15453 * BZZZTT!!1! 15454 * 15455 * <p>Provide haptic feedback to the user for this view. 15456 * 15457 * <p>The framework will provide haptic feedback for some built in actions, 15458 * such as long presses, but you may wish to provide feedback for your 15459 * own widget. 15460 * 15461 * <p>The feedback will only be performed if 15462 * {@link #isHapticFeedbackEnabled()} is true. 15463 * 15464 * @param feedbackConstant One of the constants defined in 15465 * {@link HapticFeedbackConstants} 15466 */ 15467 public boolean performHapticFeedback(int feedbackConstant) { 15468 return performHapticFeedback(feedbackConstant, 0); 15469 } 15470 15471 /** 15472 * BZZZTT!!1! 15473 * 15474 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15475 * 15476 * @param feedbackConstant One of the constants defined in 15477 * {@link HapticFeedbackConstants} 15478 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15479 */ 15480 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15481 if (mAttachInfo == null) { 15482 return false; 15483 } 15484 //noinspection SimplifiableIfStatement 15485 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15486 && !isHapticFeedbackEnabled()) { 15487 return false; 15488 } 15489 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15490 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15491 } 15492 15493 /** 15494 * Request that the visibility of the status bar or other screen/window 15495 * decorations be changed. 15496 * 15497 * <p>This method is used to put the over device UI into temporary modes 15498 * where the user's attention is focused more on the application content, 15499 * by dimming or hiding surrounding system affordances. This is typically 15500 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15501 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15502 * to be placed behind the action bar (and with these flags other system 15503 * affordances) so that smooth transitions between hiding and showing them 15504 * can be done. 15505 * 15506 * <p>Two representative examples of the use of system UI visibility is 15507 * implementing a content browsing application (like a magazine reader) 15508 * and a video playing application. 15509 * 15510 * <p>The first code shows a typical implementation of a View in a content 15511 * browsing application. In this implementation, the application goes 15512 * into a content-oriented mode by hiding the status bar and action bar, 15513 * and putting the navigation elements into lights out mode. The user can 15514 * then interact with content while in this mode. Such an application should 15515 * provide an easy way for the user to toggle out of the mode (such as to 15516 * check information in the status bar or access notifications). In the 15517 * implementation here, this is done simply by tapping on the content. 15518 * 15519 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15520 * content} 15521 * 15522 * <p>This second code sample shows a typical implementation of a View 15523 * in a video playing application. In this situation, while the video is 15524 * playing the application would like to go into a complete full-screen mode, 15525 * to use as much of the display as possible for the video. When in this state 15526 * the user can not interact with the application; the system intercepts 15527 * touching on the screen to pop the UI out of full screen mode. See 15528 * {@link #fitSystemWindows(Rect)} for a sample layout that goes with this code. 15529 * 15530 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15531 * content} 15532 * 15533 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15534 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15535 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15536 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15537 */ 15538 public void setSystemUiVisibility(int visibility) { 15539 if (visibility != mSystemUiVisibility) { 15540 mSystemUiVisibility = visibility; 15541 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15542 mParent.recomputeViewAttributes(this); 15543 } 15544 } 15545 } 15546 15547 /** 15548 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15549 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15550 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15551 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15552 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15553 */ 15554 public int getSystemUiVisibility() { 15555 return mSystemUiVisibility; 15556 } 15557 15558 /** 15559 * Returns the current system UI visibility that is currently set for 15560 * the entire window. This is the combination of the 15561 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15562 * views in the window. 15563 */ 15564 public int getWindowSystemUiVisibility() { 15565 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15566 } 15567 15568 /** 15569 * Override to find out when the window's requested system UI visibility 15570 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15571 * This is different from the callbacks recieved through 15572 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15573 * in that this is only telling you about the local request of the window, 15574 * not the actual values applied by the system. 15575 */ 15576 public void onWindowSystemUiVisibilityChanged(int visible) { 15577 } 15578 15579 /** 15580 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15581 * the view hierarchy. 15582 */ 15583 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15584 onWindowSystemUiVisibilityChanged(visible); 15585 } 15586 15587 /** 15588 * Set a listener to receive callbacks when the visibility of the system bar changes. 15589 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15590 */ 15591 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15592 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15593 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15594 mParent.recomputeViewAttributes(this); 15595 } 15596 } 15597 15598 /** 15599 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15600 * the view hierarchy. 15601 */ 15602 public void dispatchSystemUiVisibilityChanged(int visibility) { 15603 ListenerInfo li = mListenerInfo; 15604 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15605 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15606 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15607 } 15608 } 15609 15610 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 15611 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15612 if (val != mSystemUiVisibility) { 15613 setSystemUiVisibility(val); 15614 return true; 15615 } 15616 return false; 15617 } 15618 15619 /** @hide */ 15620 public void setDisabledSystemUiVisibility(int flags) { 15621 if (mAttachInfo != null) { 15622 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15623 mAttachInfo.mDisabledSystemUiVisibility = flags; 15624 if (mParent != null) { 15625 mParent.recomputeViewAttributes(this); 15626 } 15627 } 15628 } 15629 } 15630 15631 /** 15632 * Creates an image that the system displays during the drag and drop 15633 * operation. This is called a "drag shadow". The default implementation 15634 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15635 * appearance as the given View. The default also positions the center of the drag shadow 15636 * directly under the touch point. If no View is provided (the constructor with no parameters 15637 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15638 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15639 * default is an invisible drag shadow. 15640 * <p> 15641 * You are not required to use the View you provide to the constructor as the basis of the 15642 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15643 * anything you want as the drag shadow. 15644 * </p> 15645 * <p> 15646 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15647 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15648 * size and position of the drag shadow. It uses this data to construct a 15649 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15650 * so that your application can draw the shadow image in the Canvas. 15651 * </p> 15652 * 15653 * <div class="special reference"> 15654 * <h3>Developer Guides</h3> 15655 * <p>For a guide to implementing drag and drop features, read the 15656 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15657 * </div> 15658 */ 15659 public static class DragShadowBuilder { 15660 private final WeakReference<View> mView; 15661 15662 /** 15663 * Constructs a shadow image builder based on a View. By default, the resulting drag 15664 * shadow will have the same appearance and dimensions as the View, with the touch point 15665 * over the center of the View. 15666 * @param view A View. Any View in scope can be used. 15667 */ 15668 public DragShadowBuilder(View view) { 15669 mView = new WeakReference<View>(view); 15670 } 15671 15672 /** 15673 * Construct a shadow builder object with no associated View. This 15674 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15675 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15676 * to supply the drag shadow's dimensions and appearance without 15677 * reference to any View object. If they are not overridden, then the result is an 15678 * invisible drag shadow. 15679 */ 15680 public DragShadowBuilder() { 15681 mView = new WeakReference<View>(null); 15682 } 15683 15684 /** 15685 * Returns the View object that had been passed to the 15686 * {@link #View.DragShadowBuilder(View)} 15687 * constructor. If that View parameter was {@code null} or if the 15688 * {@link #View.DragShadowBuilder()} 15689 * constructor was used to instantiate the builder object, this method will return 15690 * null. 15691 * 15692 * @return The View object associate with this builder object. 15693 */ 15694 @SuppressWarnings({"JavadocReference"}) 15695 final public View getView() { 15696 return mView.get(); 15697 } 15698 15699 /** 15700 * Provides the metrics for the shadow image. These include the dimensions of 15701 * the shadow image, and the point within that shadow that should 15702 * be centered under the touch location while dragging. 15703 * <p> 15704 * The default implementation sets the dimensions of the shadow to be the 15705 * same as the dimensions of the View itself and centers the shadow under 15706 * the touch point. 15707 * </p> 15708 * 15709 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15710 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15711 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15712 * image. 15713 * 15714 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15715 * shadow image that should be underneath the touch point during the drag and drop 15716 * operation. Your application must set {@link android.graphics.Point#x} to the 15717 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15718 */ 15719 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15720 final View view = mView.get(); 15721 if (view != null) { 15722 shadowSize.set(view.getWidth(), view.getHeight()); 15723 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15724 } else { 15725 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15726 } 15727 } 15728 15729 /** 15730 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15731 * based on the dimensions it received from the 15732 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15733 * 15734 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15735 */ 15736 public void onDrawShadow(Canvas canvas) { 15737 final View view = mView.get(); 15738 if (view != null) { 15739 view.draw(canvas); 15740 } else { 15741 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15742 } 15743 } 15744 } 15745 15746 /** 15747 * Starts a drag and drop operation. When your application calls this method, it passes a 15748 * {@link android.view.View.DragShadowBuilder} object to the system. The 15749 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15750 * to get metrics for the drag shadow, and then calls the object's 15751 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15752 * <p> 15753 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15754 * drag events to all the View objects in your application that are currently visible. It does 15755 * this either by calling the View object's drag listener (an implementation of 15756 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15757 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15758 * Both are passed a {@link android.view.DragEvent} object that has a 15759 * {@link android.view.DragEvent#getAction()} value of 15760 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15761 * </p> 15762 * <p> 15763 * Your application can invoke startDrag() on any attached View object. The View object does not 15764 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15765 * be related to the View the user selected for dragging. 15766 * </p> 15767 * @param data A {@link android.content.ClipData} object pointing to the data to be 15768 * transferred by the drag and drop operation. 15769 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15770 * drag shadow. 15771 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15772 * drop operation. This Object is put into every DragEvent object sent by the system during the 15773 * current drag. 15774 * <p> 15775 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15776 * to the target Views. For example, it can contain flags that differentiate between a 15777 * a copy operation and a move operation. 15778 * </p> 15779 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15780 * so the parameter should be set to 0. 15781 * @return {@code true} if the method completes successfully, or 15782 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15783 * do a drag, and so no drag operation is in progress. 15784 */ 15785 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15786 Object myLocalState, int flags) { 15787 if (ViewDebug.DEBUG_DRAG) { 15788 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15789 } 15790 boolean okay = false; 15791 15792 Point shadowSize = new Point(); 15793 Point shadowTouchPoint = new Point(); 15794 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15795 15796 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15797 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15798 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15799 } 15800 15801 if (ViewDebug.DEBUG_DRAG) { 15802 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15803 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15804 } 15805 Surface surface = new Surface(); 15806 try { 15807 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15808 flags, shadowSize.x, shadowSize.y, surface); 15809 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15810 + " surface=" + surface); 15811 if (token != null) { 15812 Canvas canvas = surface.lockCanvas(null); 15813 try { 15814 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15815 shadowBuilder.onDrawShadow(canvas); 15816 } finally { 15817 surface.unlockCanvasAndPost(canvas); 15818 } 15819 15820 final ViewRootImpl root = getViewRootImpl(); 15821 15822 // Cache the local state object for delivery with DragEvents 15823 root.setLocalDragState(myLocalState); 15824 15825 // repurpose 'shadowSize' for the last touch point 15826 root.getLastTouchPoint(shadowSize); 15827 15828 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15829 shadowSize.x, shadowSize.y, 15830 shadowTouchPoint.x, shadowTouchPoint.y, data); 15831 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15832 15833 // Off and running! Release our local surface instance; the drag 15834 // shadow surface is now managed by the system process. 15835 surface.release(); 15836 } 15837 } catch (Exception e) { 15838 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15839 surface.destroy(); 15840 } 15841 15842 return okay; 15843 } 15844 15845 /** 15846 * Handles drag events sent by the system following a call to 15847 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15848 *<p> 15849 * When the system calls this method, it passes a 15850 * {@link android.view.DragEvent} object. A call to 15851 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15852 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15853 * operation. 15854 * @param event The {@link android.view.DragEvent} sent by the system. 15855 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15856 * in DragEvent, indicating the type of drag event represented by this object. 15857 * @return {@code true} if the method was successful, otherwise {@code false}. 15858 * <p> 15859 * The method should return {@code true} in response to an action type of 15860 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15861 * operation. 15862 * </p> 15863 * <p> 15864 * The method should also return {@code true} in response to an action type of 15865 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15866 * {@code false} if it didn't. 15867 * </p> 15868 */ 15869 public boolean onDragEvent(DragEvent event) { 15870 return false; 15871 } 15872 15873 /** 15874 * Detects if this View is enabled and has a drag event listener. 15875 * If both are true, then it calls the drag event listener with the 15876 * {@link android.view.DragEvent} it received. If the drag event listener returns 15877 * {@code true}, then dispatchDragEvent() returns {@code true}. 15878 * <p> 15879 * For all other cases, the method calls the 15880 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15881 * method and returns its result. 15882 * </p> 15883 * <p> 15884 * This ensures that a drag event is always consumed, even if the View does not have a drag 15885 * event listener. However, if the View has a listener and the listener returns true, then 15886 * onDragEvent() is not called. 15887 * </p> 15888 */ 15889 public boolean dispatchDragEvent(DragEvent event) { 15890 //noinspection SimplifiableIfStatement 15891 ListenerInfo li = mListenerInfo; 15892 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15893 && li.mOnDragListener.onDrag(this, event)) { 15894 return true; 15895 } 15896 return onDragEvent(event); 15897 } 15898 15899 boolean canAcceptDrag() { 15900 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15901 } 15902 15903 /** 15904 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15905 * it is ever exposed at all. 15906 * @hide 15907 */ 15908 public void onCloseSystemDialogs(String reason) { 15909 } 15910 15911 /** 15912 * Given a Drawable whose bounds have been set to draw into this view, 15913 * update a Region being computed for 15914 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15915 * that any non-transparent parts of the Drawable are removed from the 15916 * given transparent region. 15917 * 15918 * @param dr The Drawable whose transparency is to be applied to the region. 15919 * @param region A Region holding the current transparency information, 15920 * where any parts of the region that are set are considered to be 15921 * transparent. On return, this region will be modified to have the 15922 * transparency information reduced by the corresponding parts of the 15923 * Drawable that are not transparent. 15924 * {@hide} 15925 */ 15926 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15927 if (DBG) { 15928 Log.i("View", "Getting transparent region for: " + this); 15929 } 15930 final Region r = dr.getTransparentRegion(); 15931 final Rect db = dr.getBounds(); 15932 final AttachInfo attachInfo = mAttachInfo; 15933 if (r != null && attachInfo != null) { 15934 final int w = getRight()-getLeft(); 15935 final int h = getBottom()-getTop(); 15936 if (db.left > 0) { 15937 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15938 r.op(0, 0, db.left, h, Region.Op.UNION); 15939 } 15940 if (db.right < w) { 15941 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15942 r.op(db.right, 0, w, h, Region.Op.UNION); 15943 } 15944 if (db.top > 0) { 15945 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15946 r.op(0, 0, w, db.top, Region.Op.UNION); 15947 } 15948 if (db.bottom < h) { 15949 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15950 r.op(0, db.bottom, w, h, Region.Op.UNION); 15951 } 15952 final int[] location = attachInfo.mTransparentLocation; 15953 getLocationInWindow(location); 15954 r.translate(location[0], location[1]); 15955 region.op(r, Region.Op.INTERSECT); 15956 } else { 15957 region.op(db, Region.Op.DIFFERENCE); 15958 } 15959 } 15960 15961 private void checkForLongClick(int delayOffset) { 15962 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15963 mHasPerformedLongPress = false; 15964 15965 if (mPendingCheckForLongPress == null) { 15966 mPendingCheckForLongPress = new CheckForLongPress(); 15967 } 15968 mPendingCheckForLongPress.rememberWindowAttachCount(); 15969 postDelayed(mPendingCheckForLongPress, 15970 ViewConfiguration.getLongPressTimeout() - delayOffset); 15971 } 15972 } 15973 15974 /** 15975 * Inflate a view from an XML resource. This convenience method wraps the {@link 15976 * LayoutInflater} class, which provides a full range of options for view inflation. 15977 * 15978 * @param context The Context object for your activity or application. 15979 * @param resource The resource ID to inflate 15980 * @param root A view group that will be the parent. Used to properly inflate the 15981 * layout_* parameters. 15982 * @see LayoutInflater 15983 */ 15984 public static View inflate(Context context, int resource, ViewGroup root) { 15985 LayoutInflater factory = LayoutInflater.from(context); 15986 return factory.inflate(resource, root); 15987 } 15988 15989 /** 15990 * Scroll the view with standard behavior for scrolling beyond the normal 15991 * content boundaries. Views that call this method should override 15992 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15993 * results of an over-scroll operation. 15994 * 15995 * Views can use this method to handle any touch or fling-based scrolling. 15996 * 15997 * @param deltaX Change in X in pixels 15998 * @param deltaY Change in Y in pixels 15999 * @param scrollX Current X scroll value in pixels before applying deltaX 16000 * @param scrollY Current Y scroll value in pixels before applying deltaY 16001 * @param scrollRangeX Maximum content scroll range along the X axis 16002 * @param scrollRangeY Maximum content scroll range along the Y axis 16003 * @param maxOverScrollX Number of pixels to overscroll by in either direction 16004 * along the X axis. 16005 * @param maxOverScrollY Number of pixels to overscroll by in either direction 16006 * along the Y axis. 16007 * @param isTouchEvent true if this scroll operation is the result of a touch event. 16008 * @return true if scrolling was clamped to an over-scroll boundary along either 16009 * axis, false otherwise. 16010 */ 16011 @SuppressWarnings({"UnusedParameters"}) 16012 protected boolean overScrollBy(int deltaX, int deltaY, 16013 int scrollX, int scrollY, 16014 int scrollRangeX, int scrollRangeY, 16015 int maxOverScrollX, int maxOverScrollY, 16016 boolean isTouchEvent) { 16017 final int overScrollMode = mOverScrollMode; 16018 final boolean canScrollHorizontal = 16019 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 16020 final boolean canScrollVertical = 16021 computeVerticalScrollRange() > computeVerticalScrollExtent(); 16022 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 16023 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 16024 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 16025 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 16026 16027 int newScrollX = scrollX + deltaX; 16028 if (!overScrollHorizontal) { 16029 maxOverScrollX = 0; 16030 } 16031 16032 int newScrollY = scrollY + deltaY; 16033 if (!overScrollVertical) { 16034 maxOverScrollY = 0; 16035 } 16036 16037 // Clamp values if at the limits and record 16038 final int left = -maxOverScrollX; 16039 final int right = maxOverScrollX + scrollRangeX; 16040 final int top = -maxOverScrollY; 16041 final int bottom = maxOverScrollY + scrollRangeY; 16042 16043 boolean clampedX = false; 16044 if (newScrollX > right) { 16045 newScrollX = right; 16046 clampedX = true; 16047 } else if (newScrollX < left) { 16048 newScrollX = left; 16049 clampedX = true; 16050 } 16051 16052 boolean clampedY = false; 16053 if (newScrollY > bottom) { 16054 newScrollY = bottom; 16055 clampedY = true; 16056 } else if (newScrollY < top) { 16057 newScrollY = top; 16058 clampedY = true; 16059 } 16060 16061 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 16062 16063 return clampedX || clampedY; 16064 } 16065 16066 /** 16067 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 16068 * respond to the results of an over-scroll operation. 16069 * 16070 * @param scrollX New X scroll value in pixels 16071 * @param scrollY New Y scroll value in pixels 16072 * @param clampedX True if scrollX was clamped to an over-scroll boundary 16073 * @param clampedY True if scrollY was clamped to an over-scroll boundary 16074 */ 16075 protected void onOverScrolled(int scrollX, int scrollY, 16076 boolean clampedX, boolean clampedY) { 16077 // Intentionally empty. 16078 } 16079 16080 /** 16081 * Returns the over-scroll mode for this view. The result will be 16082 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16083 * (allow over-scrolling only if the view content is larger than the container), 16084 * or {@link #OVER_SCROLL_NEVER}. 16085 * 16086 * @return This view's over-scroll mode. 16087 */ 16088 public int getOverScrollMode() { 16089 return mOverScrollMode; 16090 } 16091 16092 /** 16093 * Set the over-scroll mode for this view. Valid over-scroll modes are 16094 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 16095 * (allow over-scrolling only if the view content is larger than the container), 16096 * or {@link #OVER_SCROLL_NEVER}. 16097 * 16098 * Setting the over-scroll mode of a view will have an effect only if the 16099 * view is capable of scrolling. 16100 * 16101 * @param overScrollMode The new over-scroll mode for this view. 16102 */ 16103 public void setOverScrollMode(int overScrollMode) { 16104 if (overScrollMode != OVER_SCROLL_ALWAYS && 16105 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 16106 overScrollMode != OVER_SCROLL_NEVER) { 16107 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 16108 } 16109 mOverScrollMode = overScrollMode; 16110 } 16111 16112 /** 16113 * Gets a scale factor that determines the distance the view should scroll 16114 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 16115 * @return The vertical scroll scale factor. 16116 * @hide 16117 */ 16118 protected float getVerticalScrollFactor() { 16119 if (mVerticalScrollFactor == 0) { 16120 TypedValue outValue = new TypedValue(); 16121 if (!mContext.getTheme().resolveAttribute( 16122 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 16123 throw new IllegalStateException( 16124 "Expected theme to define listPreferredItemHeight."); 16125 } 16126 mVerticalScrollFactor = outValue.getDimension( 16127 mContext.getResources().getDisplayMetrics()); 16128 } 16129 return mVerticalScrollFactor; 16130 } 16131 16132 /** 16133 * Gets a scale factor that determines the distance the view should scroll 16134 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 16135 * @return The horizontal scroll scale factor. 16136 * @hide 16137 */ 16138 protected float getHorizontalScrollFactor() { 16139 // TODO: Should use something else. 16140 return getVerticalScrollFactor(); 16141 } 16142 16143 /** 16144 * Return the value specifying the text direction or policy that was set with 16145 * {@link #setTextDirection(int)}. 16146 * 16147 * @return the defined text direction. It can be one of: 16148 * 16149 * {@link #TEXT_DIRECTION_INHERIT}, 16150 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16151 * {@link #TEXT_DIRECTION_ANY_RTL}, 16152 * {@link #TEXT_DIRECTION_LTR}, 16153 * {@link #TEXT_DIRECTION_RTL}, 16154 * {@link #TEXT_DIRECTION_LOCALE} 16155 * @hide 16156 */ 16157 @ViewDebug.ExportedProperty(category = "text", mapping = { 16158 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 16159 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 16160 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 16161 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 16162 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 16163 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 16164 }) 16165 public int getTextDirection() { 16166 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 16167 } 16168 16169 /** 16170 * Set the text direction. 16171 * 16172 * @param textDirection the direction to set. Should be one of: 16173 * 16174 * {@link #TEXT_DIRECTION_INHERIT}, 16175 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16176 * {@link #TEXT_DIRECTION_ANY_RTL}, 16177 * {@link #TEXT_DIRECTION_LTR}, 16178 * {@link #TEXT_DIRECTION_RTL}, 16179 * {@link #TEXT_DIRECTION_LOCALE} 16180 * @hide 16181 */ 16182 public void setTextDirection(int textDirection) { 16183 if (getTextDirection() != textDirection) { 16184 // Reset the current text direction and the resolved one 16185 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 16186 resetResolvedTextDirection(); 16187 // Set the new text direction 16188 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 16189 // Refresh 16190 requestLayout(); 16191 invalidate(true); 16192 } 16193 } 16194 16195 /** 16196 * Return the resolved text direction. 16197 * 16198 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 16199 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 16200 * up the parent chain of the view. if there is no parent, then it will return the default 16201 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 16202 * 16203 * @return the resolved text direction. Returns one of: 16204 * 16205 * {@link #TEXT_DIRECTION_FIRST_STRONG} 16206 * {@link #TEXT_DIRECTION_ANY_RTL}, 16207 * {@link #TEXT_DIRECTION_LTR}, 16208 * {@link #TEXT_DIRECTION_RTL}, 16209 * {@link #TEXT_DIRECTION_LOCALE} 16210 * @hide 16211 */ 16212 public int getResolvedTextDirection() { 16213 // The text direction will be resolved only if needed 16214 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 16215 resolveTextDirection(); 16216 } 16217 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 16218 } 16219 16220 /** 16221 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 16222 * resolution is done. 16223 * @hide 16224 */ 16225 public void resolveTextDirection() { 16226 // Reset any previous text direction resolution 16227 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16228 16229 if (hasRtlSupport()) { 16230 // Set resolved text direction flag depending on text direction flag 16231 final int textDirection = getTextDirection(); 16232 switch(textDirection) { 16233 case TEXT_DIRECTION_INHERIT: 16234 if (canResolveTextDirection()) { 16235 ViewGroup viewGroup = ((ViewGroup) mParent); 16236 16237 // Set current resolved direction to the same value as the parent's one 16238 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 16239 switch (parentResolvedDirection) { 16240 case TEXT_DIRECTION_FIRST_STRONG: 16241 case TEXT_DIRECTION_ANY_RTL: 16242 case TEXT_DIRECTION_LTR: 16243 case TEXT_DIRECTION_RTL: 16244 case TEXT_DIRECTION_LOCALE: 16245 mPrivateFlags2 |= 16246 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16247 break; 16248 default: 16249 // Default resolved direction is "first strong" heuristic 16250 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16251 } 16252 } else { 16253 // We cannot do the resolution if there is no parent, so use the default one 16254 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16255 } 16256 break; 16257 case TEXT_DIRECTION_FIRST_STRONG: 16258 case TEXT_DIRECTION_ANY_RTL: 16259 case TEXT_DIRECTION_LTR: 16260 case TEXT_DIRECTION_RTL: 16261 case TEXT_DIRECTION_LOCALE: 16262 // Resolved direction is the same as text direction 16263 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 16264 break; 16265 default: 16266 // Default resolved direction is "first strong" heuristic 16267 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16268 } 16269 } else { 16270 // Default resolved direction is "first strong" heuristic 16271 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 16272 } 16273 16274 // Set to resolved 16275 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 16276 onResolvedTextDirectionChanged(); 16277 } 16278 16279 /** 16280 * Called when text direction has been resolved. Subclasses that care about text direction 16281 * resolution should override this method. 16282 * 16283 * The default implementation does nothing. 16284 * @hide 16285 */ 16286 public void onResolvedTextDirectionChanged() { 16287 } 16288 16289 /** 16290 * Check if text direction resolution can be done. 16291 * 16292 * @return true if text direction resolution can be done otherwise return false. 16293 * @hide 16294 */ 16295 public boolean canResolveTextDirection() { 16296 switch (getTextDirection()) { 16297 case TEXT_DIRECTION_INHERIT: 16298 return (mParent != null) && (mParent instanceof ViewGroup); 16299 default: 16300 return true; 16301 } 16302 } 16303 16304 /** 16305 * Reset resolved text direction. Text direction can be resolved with a call to 16306 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 16307 * reset is done. 16308 * @hide 16309 */ 16310 public void resetResolvedTextDirection() { 16311 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 16312 onResolvedTextDirectionReset(); 16313 } 16314 16315 /** 16316 * Called when text direction is reset. Subclasses that care about text direction reset should 16317 * override this method and do a reset of the text direction of their children. The default 16318 * implementation does nothing. 16319 * @hide 16320 */ 16321 public void onResolvedTextDirectionReset() { 16322 } 16323 16324 /** 16325 * Return the value specifying the text alignment or policy that was set with 16326 * {@link #setTextAlignment(int)}. 16327 * 16328 * @return the defined text alignment. It can be one of: 16329 * 16330 * {@link #TEXT_ALIGNMENT_INHERIT}, 16331 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16332 * {@link #TEXT_ALIGNMENT_CENTER}, 16333 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16334 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16335 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16336 * {@link #TEXT_ALIGNMENT_VIEW_END} 16337 * @hide 16338 */ 16339 @ViewDebug.ExportedProperty(category = "text", mapping = { 16340 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16341 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16342 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16343 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16344 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16345 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16346 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16347 }) 16348 public int getTextAlignment() { 16349 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 16350 } 16351 16352 /** 16353 * Set the text alignment. 16354 * 16355 * @param textAlignment The text alignment to set. Should be one of 16356 * 16357 * {@link #TEXT_ALIGNMENT_INHERIT}, 16358 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16359 * {@link #TEXT_ALIGNMENT_CENTER}, 16360 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16361 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16362 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16363 * {@link #TEXT_ALIGNMENT_VIEW_END} 16364 * 16365 * @attr ref android.R.styleable#View_textAlignment 16366 * @hide 16367 */ 16368 public void setTextAlignment(int textAlignment) { 16369 if (textAlignment != getTextAlignment()) { 16370 // Reset the current and resolved text alignment 16371 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 16372 resetResolvedTextAlignment(); 16373 // Set the new text alignment 16374 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 16375 // Refresh 16376 requestLayout(); 16377 invalidate(true); 16378 } 16379 } 16380 16381 /** 16382 * Return the resolved text alignment. 16383 * 16384 * The resolved text alignment. This needs resolution if the value is 16385 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16386 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16387 * 16388 * @return the resolved text alignment. Returns one of: 16389 * 16390 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16391 * {@link #TEXT_ALIGNMENT_CENTER}, 16392 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16393 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16394 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16395 * {@link #TEXT_ALIGNMENT_VIEW_END} 16396 * @hide 16397 */ 16398 @ViewDebug.ExportedProperty(category = "text", mapping = { 16399 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16400 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16401 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16402 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16403 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16404 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16405 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16406 }) 16407 public int getResolvedTextAlignment() { 16408 // If text alignment is not resolved, then resolve it 16409 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16410 resolveTextAlignment(); 16411 } 16412 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16413 } 16414 16415 /** 16416 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16417 * resolution is done. 16418 * @hide 16419 */ 16420 public void resolveTextAlignment() { 16421 // Reset any previous text alignment resolution 16422 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16423 16424 if (hasRtlSupport()) { 16425 // Set resolved text alignment flag depending on text alignment flag 16426 final int textAlignment = getTextAlignment(); 16427 switch (textAlignment) { 16428 case TEXT_ALIGNMENT_INHERIT: 16429 // Check if we can resolve the text alignment 16430 if (canResolveLayoutDirection() && mParent instanceof View) { 16431 View view = (View) mParent; 16432 16433 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16434 switch (parentResolvedTextAlignment) { 16435 case TEXT_ALIGNMENT_GRAVITY: 16436 case TEXT_ALIGNMENT_TEXT_START: 16437 case TEXT_ALIGNMENT_TEXT_END: 16438 case TEXT_ALIGNMENT_CENTER: 16439 case TEXT_ALIGNMENT_VIEW_START: 16440 case TEXT_ALIGNMENT_VIEW_END: 16441 // Resolved text alignment is the same as the parent resolved 16442 // text alignment 16443 mPrivateFlags2 |= 16444 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16445 break; 16446 default: 16447 // Use default resolved text alignment 16448 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16449 } 16450 } 16451 else { 16452 // We cannot do the resolution if there is no parent so use the default 16453 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16454 } 16455 break; 16456 case TEXT_ALIGNMENT_GRAVITY: 16457 case TEXT_ALIGNMENT_TEXT_START: 16458 case TEXT_ALIGNMENT_TEXT_END: 16459 case TEXT_ALIGNMENT_CENTER: 16460 case TEXT_ALIGNMENT_VIEW_START: 16461 case TEXT_ALIGNMENT_VIEW_END: 16462 // Resolved text alignment is the same as text alignment 16463 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16464 break; 16465 default: 16466 // Use default resolved text alignment 16467 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16468 } 16469 } else { 16470 // Use default resolved text alignment 16471 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16472 } 16473 16474 // Set the resolved 16475 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16476 onResolvedTextAlignmentChanged(); 16477 } 16478 16479 /** 16480 * Check if text alignment resolution can be done. 16481 * 16482 * @return true if text alignment resolution can be done otherwise return false. 16483 * @hide 16484 */ 16485 public boolean canResolveTextAlignment() { 16486 switch (getTextAlignment()) { 16487 case TEXT_DIRECTION_INHERIT: 16488 return (mParent != null); 16489 default: 16490 return true; 16491 } 16492 } 16493 16494 /** 16495 * Called when text alignment has been resolved. Subclasses that care about text alignment 16496 * resolution should override this method. 16497 * 16498 * The default implementation does nothing. 16499 * @hide 16500 */ 16501 public void onResolvedTextAlignmentChanged() { 16502 } 16503 16504 /** 16505 * Reset resolved text alignment. Text alignment can be resolved with a call to 16506 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16507 * reset is done. 16508 * @hide 16509 */ 16510 public void resetResolvedTextAlignment() { 16511 // Reset any previous text alignment resolution 16512 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16513 onResolvedTextAlignmentReset(); 16514 } 16515 16516 /** 16517 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16518 * override this method and do a reset of the text alignment of their children. The default 16519 * implementation does nothing. 16520 * @hide 16521 */ 16522 public void onResolvedTextAlignmentReset() { 16523 } 16524 16525 // 16526 // Properties 16527 // 16528 /** 16529 * A Property wrapper around the <code>alpha</code> functionality handled by the 16530 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16531 */ 16532 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16533 @Override 16534 public void setValue(View object, float value) { 16535 object.setAlpha(value); 16536 } 16537 16538 @Override 16539 public Float get(View object) { 16540 return object.getAlpha(); 16541 } 16542 }; 16543 16544 /** 16545 * A Property wrapper around the <code>translationX</code> functionality handled by the 16546 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16547 */ 16548 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16549 @Override 16550 public void setValue(View object, float value) { 16551 object.setTranslationX(value); 16552 } 16553 16554 @Override 16555 public Float get(View object) { 16556 return object.getTranslationX(); 16557 } 16558 }; 16559 16560 /** 16561 * A Property wrapper around the <code>translationY</code> functionality handled by the 16562 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16563 */ 16564 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16565 @Override 16566 public void setValue(View object, float value) { 16567 object.setTranslationY(value); 16568 } 16569 16570 @Override 16571 public Float get(View object) { 16572 return object.getTranslationY(); 16573 } 16574 }; 16575 16576 /** 16577 * A Property wrapper around the <code>x</code> functionality handled by the 16578 * {@link View#setX(float)} and {@link View#getX()} methods. 16579 */ 16580 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16581 @Override 16582 public void setValue(View object, float value) { 16583 object.setX(value); 16584 } 16585 16586 @Override 16587 public Float get(View object) { 16588 return object.getX(); 16589 } 16590 }; 16591 16592 /** 16593 * A Property wrapper around the <code>y</code> functionality handled by the 16594 * {@link View#setY(float)} and {@link View#getY()} methods. 16595 */ 16596 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16597 @Override 16598 public void setValue(View object, float value) { 16599 object.setY(value); 16600 } 16601 16602 @Override 16603 public Float get(View object) { 16604 return object.getY(); 16605 } 16606 }; 16607 16608 /** 16609 * A Property wrapper around the <code>rotation</code> functionality handled by the 16610 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16611 */ 16612 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16613 @Override 16614 public void setValue(View object, float value) { 16615 object.setRotation(value); 16616 } 16617 16618 @Override 16619 public Float get(View object) { 16620 return object.getRotation(); 16621 } 16622 }; 16623 16624 /** 16625 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16626 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16627 */ 16628 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16629 @Override 16630 public void setValue(View object, float value) { 16631 object.setRotationX(value); 16632 } 16633 16634 @Override 16635 public Float get(View object) { 16636 return object.getRotationX(); 16637 } 16638 }; 16639 16640 /** 16641 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16642 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16643 */ 16644 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16645 @Override 16646 public void setValue(View object, float value) { 16647 object.setRotationY(value); 16648 } 16649 16650 @Override 16651 public Float get(View object) { 16652 return object.getRotationY(); 16653 } 16654 }; 16655 16656 /** 16657 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16658 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16659 */ 16660 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16661 @Override 16662 public void setValue(View object, float value) { 16663 object.setScaleX(value); 16664 } 16665 16666 @Override 16667 public Float get(View object) { 16668 return object.getScaleX(); 16669 } 16670 }; 16671 16672 /** 16673 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16674 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16675 */ 16676 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16677 @Override 16678 public void setValue(View object, float value) { 16679 object.setScaleY(value); 16680 } 16681 16682 @Override 16683 public Float get(View object) { 16684 return object.getScaleY(); 16685 } 16686 }; 16687 16688 /** 16689 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16690 * Each MeasureSpec represents a requirement for either the width or the height. 16691 * A MeasureSpec is comprised of a size and a mode. There are three possible 16692 * modes: 16693 * <dl> 16694 * <dt>UNSPECIFIED</dt> 16695 * <dd> 16696 * The parent has not imposed any constraint on the child. It can be whatever size 16697 * it wants. 16698 * </dd> 16699 * 16700 * <dt>EXACTLY</dt> 16701 * <dd> 16702 * The parent has determined an exact size for the child. The child is going to be 16703 * given those bounds regardless of how big it wants to be. 16704 * </dd> 16705 * 16706 * <dt>AT_MOST</dt> 16707 * <dd> 16708 * The child can be as large as it wants up to the specified size. 16709 * </dd> 16710 * </dl> 16711 * 16712 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16713 * is provided to pack and unpack the <size, mode> tuple into the int. 16714 */ 16715 public static class MeasureSpec { 16716 private static final int MODE_SHIFT = 30; 16717 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16718 16719 /** 16720 * Measure specification mode: The parent has not imposed any constraint 16721 * on the child. It can be whatever size it wants. 16722 */ 16723 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16724 16725 /** 16726 * Measure specification mode: The parent has determined an exact size 16727 * for the child. The child is going to be given those bounds regardless 16728 * of how big it wants to be. 16729 */ 16730 public static final int EXACTLY = 1 << MODE_SHIFT; 16731 16732 /** 16733 * Measure specification mode: The child can be as large as it wants up 16734 * to the specified size. 16735 */ 16736 public static final int AT_MOST = 2 << MODE_SHIFT; 16737 16738 /** 16739 * Creates a measure specification based on the supplied size and mode. 16740 * 16741 * The mode must always be one of the following: 16742 * <ul> 16743 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16744 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16745 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16746 * </ul> 16747 * 16748 * @param size the size of the measure specification 16749 * @param mode the mode of the measure specification 16750 * @return the measure specification based on size and mode 16751 */ 16752 public static int makeMeasureSpec(int size, int mode) { 16753 return size + mode; 16754 } 16755 16756 /** 16757 * Extracts the mode from the supplied measure specification. 16758 * 16759 * @param measureSpec the measure specification to extract the mode from 16760 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16761 * {@link android.view.View.MeasureSpec#AT_MOST} or 16762 * {@link android.view.View.MeasureSpec#EXACTLY} 16763 */ 16764 public static int getMode(int measureSpec) { 16765 return (measureSpec & MODE_MASK); 16766 } 16767 16768 /** 16769 * Extracts the size from the supplied measure specification. 16770 * 16771 * @param measureSpec the measure specification to extract the size from 16772 * @return the size in pixels defined in the supplied measure specification 16773 */ 16774 public static int getSize(int measureSpec) { 16775 return (measureSpec & ~MODE_MASK); 16776 } 16777 16778 /** 16779 * Returns a String representation of the specified measure 16780 * specification. 16781 * 16782 * @param measureSpec the measure specification to convert to a String 16783 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16784 */ 16785 public static String toString(int measureSpec) { 16786 int mode = getMode(measureSpec); 16787 int size = getSize(measureSpec); 16788 16789 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16790 16791 if (mode == UNSPECIFIED) 16792 sb.append("UNSPECIFIED "); 16793 else if (mode == EXACTLY) 16794 sb.append("EXACTLY "); 16795 else if (mode == AT_MOST) 16796 sb.append("AT_MOST "); 16797 else 16798 sb.append(mode).append(" "); 16799 16800 sb.append(size); 16801 return sb.toString(); 16802 } 16803 } 16804 16805 class CheckForLongPress implements Runnable { 16806 16807 private int mOriginalWindowAttachCount; 16808 16809 public void run() { 16810 if (isPressed() && (mParent != null) 16811 && mOriginalWindowAttachCount == mWindowAttachCount) { 16812 if (performLongClick()) { 16813 mHasPerformedLongPress = true; 16814 } 16815 } 16816 } 16817 16818 public void rememberWindowAttachCount() { 16819 mOriginalWindowAttachCount = mWindowAttachCount; 16820 } 16821 } 16822 16823 private final class CheckForTap implements Runnable { 16824 public void run() { 16825 mPrivateFlags &= ~PREPRESSED; 16826 setPressed(true); 16827 checkForLongClick(ViewConfiguration.getTapTimeout()); 16828 } 16829 } 16830 16831 private final class PerformClick implements Runnable { 16832 public void run() { 16833 performClick(); 16834 } 16835 } 16836 16837 /** @hide */ 16838 public void hackTurnOffWindowResizeAnim(boolean off) { 16839 mAttachInfo.mTurnOffWindowResizeAnim = off; 16840 } 16841 16842 /** 16843 * This method returns a ViewPropertyAnimator object, which can be used to animate 16844 * specific properties on this View. 16845 * 16846 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16847 */ 16848 public ViewPropertyAnimator animate() { 16849 if (mAnimator == null) { 16850 mAnimator = new ViewPropertyAnimator(this); 16851 } 16852 return mAnimator; 16853 } 16854 16855 /** 16856 * Interface definition for a callback to be invoked when a key event is 16857 * dispatched to this view. The callback will be invoked before the key 16858 * event is given to the view. 16859 */ 16860 public interface OnKeyListener { 16861 /** 16862 * Called when a key is dispatched to a view. This allows listeners to 16863 * get a chance to respond before the target view. 16864 * 16865 * @param v The view the key has been dispatched to. 16866 * @param keyCode The code for the physical key that was pressed 16867 * @param event The KeyEvent object containing full information about 16868 * the event. 16869 * @return True if the listener has consumed the event, false otherwise. 16870 */ 16871 boolean onKey(View v, int keyCode, KeyEvent event); 16872 } 16873 16874 /** 16875 * Interface definition for a callback to be invoked when a touch event is 16876 * dispatched to this view. The callback will be invoked before the touch 16877 * event is given to the view. 16878 */ 16879 public interface OnTouchListener { 16880 /** 16881 * Called when a touch event is dispatched to a view. This allows listeners to 16882 * get a chance to respond before the target view. 16883 * 16884 * @param v The view the touch event has been dispatched to. 16885 * @param event The MotionEvent object containing full information about 16886 * the event. 16887 * @return True if the listener has consumed the event, false otherwise. 16888 */ 16889 boolean onTouch(View v, MotionEvent event); 16890 } 16891 16892 /** 16893 * Interface definition for a callback to be invoked when a hover event is 16894 * dispatched to this view. The callback will be invoked before the hover 16895 * event is given to the view. 16896 */ 16897 public interface OnHoverListener { 16898 /** 16899 * Called when a hover event is dispatched to a view. This allows listeners to 16900 * get a chance to respond before the target view. 16901 * 16902 * @param v The view the hover event has been dispatched to. 16903 * @param event The MotionEvent object containing full information about 16904 * the event. 16905 * @return True if the listener has consumed the event, false otherwise. 16906 */ 16907 boolean onHover(View v, MotionEvent event); 16908 } 16909 16910 /** 16911 * Interface definition for a callback to be invoked when a generic motion event is 16912 * dispatched to this view. The callback will be invoked before the generic motion 16913 * event is given to the view. 16914 */ 16915 public interface OnGenericMotionListener { 16916 /** 16917 * Called when a generic motion event is dispatched to a view. This allows listeners to 16918 * get a chance to respond before the target view. 16919 * 16920 * @param v The view the generic motion event has been dispatched to. 16921 * @param event The MotionEvent object containing full information about 16922 * the event. 16923 * @return True if the listener has consumed the event, false otherwise. 16924 */ 16925 boolean onGenericMotion(View v, MotionEvent event); 16926 } 16927 16928 /** 16929 * Interface definition for a callback to be invoked when a view has been clicked and held. 16930 */ 16931 public interface OnLongClickListener { 16932 /** 16933 * Called when a view has been clicked and held. 16934 * 16935 * @param v The view that was clicked and held. 16936 * 16937 * @return true if the callback consumed the long click, false otherwise. 16938 */ 16939 boolean onLongClick(View v); 16940 } 16941 16942 /** 16943 * Interface definition for a callback to be invoked when a drag is being dispatched 16944 * to this view. The callback will be invoked before the hosting view's own 16945 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16946 * onDrag(event) behavior, it should return 'false' from this callback. 16947 * 16948 * <div class="special reference"> 16949 * <h3>Developer Guides</h3> 16950 * <p>For a guide to implementing drag and drop features, read the 16951 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16952 * </div> 16953 */ 16954 public interface OnDragListener { 16955 /** 16956 * Called when a drag event is dispatched to a view. This allows listeners 16957 * to get a chance to override base View behavior. 16958 * 16959 * @param v The View that received the drag event. 16960 * @param event The {@link android.view.DragEvent} object for the drag event. 16961 * @return {@code true} if the drag event was handled successfully, or {@code false} 16962 * if the drag event was not handled. Note that {@code false} will trigger the View 16963 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16964 */ 16965 boolean onDrag(View v, DragEvent event); 16966 } 16967 16968 /** 16969 * Interface definition for a callback to be invoked when the focus state of 16970 * a view changed. 16971 */ 16972 public interface OnFocusChangeListener { 16973 /** 16974 * Called when the focus state of a view has changed. 16975 * 16976 * @param v The view whose state has changed. 16977 * @param hasFocus The new focus state of v. 16978 */ 16979 void onFocusChange(View v, boolean hasFocus); 16980 } 16981 16982 /** 16983 * Interface definition for a callback to be invoked when a view is clicked. 16984 */ 16985 public interface OnClickListener { 16986 /** 16987 * Called when a view has been clicked. 16988 * 16989 * @param v The view that was clicked. 16990 */ 16991 void onClick(View v); 16992 } 16993 16994 /** 16995 * Interface definition for a callback to be invoked when the context menu 16996 * for this view is being built. 16997 */ 16998 public interface OnCreateContextMenuListener { 16999 /** 17000 * Called when the context menu for this view is being built. It is not 17001 * safe to hold onto the menu after this method returns. 17002 * 17003 * @param menu The context menu that is being built 17004 * @param v The view for which the context menu is being built 17005 * @param menuInfo Extra information about the item for which the 17006 * context menu should be shown. This information will vary 17007 * depending on the class of v. 17008 */ 17009 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 17010 } 17011 17012 /** 17013 * Interface definition for a callback to be invoked when the status bar changes 17014 * visibility. This reports <strong>global</strong> changes to the system UI 17015 * state, not what the application is requesting. 17016 * 17017 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 17018 */ 17019 public interface OnSystemUiVisibilityChangeListener { 17020 /** 17021 * Called when the status bar changes visibility because of a call to 17022 * {@link View#setSystemUiVisibility(int)}. 17023 * 17024 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 17025 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, and {@link #SYSTEM_UI_FLAG_FULLSCREEN}. 17026 * This tells you the <strong>global</strong> state of these UI visibility 17027 * flags, not what your app is currently applying. 17028 */ 17029 public void onSystemUiVisibilityChange(int visibility); 17030 } 17031 17032 /** 17033 * Interface definition for a callback to be invoked when this view is attached 17034 * or detached from its window. 17035 */ 17036 public interface OnAttachStateChangeListener { 17037 /** 17038 * Called when the view is attached to a window. 17039 * @param v The view that was attached 17040 */ 17041 public void onViewAttachedToWindow(View v); 17042 /** 17043 * Called when the view is detached from a window. 17044 * @param v The view that was detached 17045 */ 17046 public void onViewDetachedFromWindow(View v); 17047 } 17048 17049 private final class UnsetPressedState implements Runnable { 17050 public void run() { 17051 setPressed(false); 17052 } 17053 } 17054 17055 /** 17056 * Base class for derived classes that want to save and restore their own 17057 * state in {@link android.view.View#onSaveInstanceState()}. 17058 */ 17059 public static class BaseSavedState extends AbsSavedState { 17060 /** 17061 * Constructor used when reading from a parcel. Reads the state of the superclass. 17062 * 17063 * @param source 17064 */ 17065 public BaseSavedState(Parcel source) { 17066 super(source); 17067 } 17068 17069 /** 17070 * Constructor called by derived classes when creating their SavedState objects 17071 * 17072 * @param superState The state of the superclass of this view 17073 */ 17074 public BaseSavedState(Parcelable superState) { 17075 super(superState); 17076 } 17077 17078 public static final Parcelable.Creator<BaseSavedState> CREATOR = 17079 new Parcelable.Creator<BaseSavedState>() { 17080 public BaseSavedState createFromParcel(Parcel in) { 17081 return new BaseSavedState(in); 17082 } 17083 17084 public BaseSavedState[] newArray(int size) { 17085 return new BaseSavedState[size]; 17086 } 17087 }; 17088 } 17089 17090 /** 17091 * A set of information given to a view when it is attached to its parent 17092 * window. 17093 */ 17094 static class AttachInfo { 17095 interface Callbacks { 17096 void playSoundEffect(int effectId); 17097 boolean performHapticFeedback(int effectId, boolean always); 17098 } 17099 17100 /** 17101 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 17102 * to a Handler. This class contains the target (View) to invalidate and 17103 * the coordinates of the dirty rectangle. 17104 * 17105 * For performance purposes, this class also implements a pool of up to 17106 * POOL_LIMIT objects that get reused. This reduces memory allocations 17107 * whenever possible. 17108 */ 17109 static class InvalidateInfo implements Poolable<InvalidateInfo> { 17110 private static final int POOL_LIMIT = 10; 17111 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 17112 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 17113 public InvalidateInfo newInstance() { 17114 return new InvalidateInfo(); 17115 } 17116 17117 public void onAcquired(InvalidateInfo element) { 17118 } 17119 17120 public void onReleased(InvalidateInfo element) { 17121 element.target = null; 17122 } 17123 }, POOL_LIMIT) 17124 ); 17125 17126 private InvalidateInfo mNext; 17127 private boolean mIsPooled; 17128 17129 View target; 17130 17131 int left; 17132 int top; 17133 int right; 17134 int bottom; 17135 17136 public void setNextPoolable(InvalidateInfo element) { 17137 mNext = element; 17138 } 17139 17140 public InvalidateInfo getNextPoolable() { 17141 return mNext; 17142 } 17143 17144 static InvalidateInfo acquire() { 17145 return sPool.acquire(); 17146 } 17147 17148 void release() { 17149 sPool.release(this); 17150 } 17151 17152 public boolean isPooled() { 17153 return mIsPooled; 17154 } 17155 17156 public void setPooled(boolean isPooled) { 17157 mIsPooled = isPooled; 17158 } 17159 } 17160 17161 final IWindowSession mSession; 17162 17163 final IWindow mWindow; 17164 17165 final IBinder mWindowToken; 17166 17167 final Callbacks mRootCallbacks; 17168 17169 HardwareCanvas mHardwareCanvas; 17170 17171 /** 17172 * The top view of the hierarchy. 17173 */ 17174 View mRootView; 17175 17176 IBinder mPanelParentWindowToken; 17177 Surface mSurface; 17178 17179 boolean mHardwareAccelerated; 17180 boolean mHardwareAccelerationRequested; 17181 HardwareRenderer mHardwareRenderer; 17182 17183 boolean mScreenOn; 17184 17185 /** 17186 * Scale factor used by the compatibility mode 17187 */ 17188 float mApplicationScale; 17189 17190 /** 17191 * Indicates whether the application is in compatibility mode 17192 */ 17193 boolean mScalingRequired; 17194 17195 /** 17196 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 17197 */ 17198 boolean mTurnOffWindowResizeAnim; 17199 17200 /** 17201 * Left position of this view's window 17202 */ 17203 int mWindowLeft; 17204 17205 /** 17206 * Top position of this view's window 17207 */ 17208 int mWindowTop; 17209 17210 /** 17211 * Indicates whether views need to use 32-bit drawing caches 17212 */ 17213 boolean mUse32BitDrawingCache; 17214 17215 /** 17216 * For windows that are full-screen but using insets to layout inside 17217 * of the screen decorations, these are the current insets for the 17218 * content of the window. 17219 */ 17220 final Rect mContentInsets = new Rect(); 17221 17222 /** 17223 * For windows that are full-screen but using insets to layout inside 17224 * of the screen decorations, these are the current insets for the 17225 * actual visible parts of the window. 17226 */ 17227 final Rect mVisibleInsets = new Rect(); 17228 17229 /** 17230 * The internal insets given by this window. This value is 17231 * supplied by the client (through 17232 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 17233 * be given to the window manager when changed to be used in laying 17234 * out windows behind it. 17235 */ 17236 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 17237 = new ViewTreeObserver.InternalInsetsInfo(); 17238 17239 /** 17240 * All views in the window's hierarchy that serve as scroll containers, 17241 * used to determine if the window can be resized or must be panned 17242 * to adjust for a soft input area. 17243 */ 17244 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 17245 17246 final KeyEvent.DispatcherState mKeyDispatchState 17247 = new KeyEvent.DispatcherState(); 17248 17249 /** 17250 * Indicates whether the view's window currently has the focus. 17251 */ 17252 boolean mHasWindowFocus; 17253 17254 /** 17255 * The current visibility of the window. 17256 */ 17257 int mWindowVisibility; 17258 17259 /** 17260 * Indicates the time at which drawing started to occur. 17261 */ 17262 long mDrawingTime; 17263 17264 /** 17265 * Indicates whether or not ignoring the DIRTY_MASK flags. 17266 */ 17267 boolean mIgnoreDirtyState; 17268 17269 /** 17270 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 17271 * to avoid clearing that flag prematurely. 17272 */ 17273 boolean mSetIgnoreDirtyState = false; 17274 17275 /** 17276 * Indicates whether the view's window is currently in touch mode. 17277 */ 17278 boolean mInTouchMode; 17279 17280 /** 17281 * Indicates that ViewAncestor should trigger a global layout change 17282 * the next time it performs a traversal 17283 */ 17284 boolean mRecomputeGlobalAttributes; 17285 17286 /** 17287 * Always report new attributes at next traversal. 17288 */ 17289 boolean mForceReportNewAttributes; 17290 17291 /** 17292 * Set during a traveral if any views want to keep the screen on. 17293 */ 17294 boolean mKeepScreenOn; 17295 17296 /** 17297 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 17298 */ 17299 int mSystemUiVisibility; 17300 17301 /** 17302 * Hack to force certain system UI visibility flags to be cleared. 17303 */ 17304 int mDisabledSystemUiVisibility; 17305 17306 /** 17307 * Last global system UI visibility reported by the window manager. 17308 */ 17309 int mGlobalSystemUiVisibility; 17310 17311 /** 17312 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 17313 * attached. 17314 */ 17315 boolean mHasSystemUiListeners; 17316 17317 /** 17318 * Set if the visibility of any views has changed. 17319 */ 17320 boolean mViewVisibilityChanged; 17321 17322 /** 17323 * Set to true if a view has been scrolled. 17324 */ 17325 boolean mViewScrollChanged; 17326 17327 /** 17328 * Global to the view hierarchy used as a temporary for dealing with 17329 * x/y points in the transparent region computations. 17330 */ 17331 final int[] mTransparentLocation = new int[2]; 17332 17333 /** 17334 * Global to the view hierarchy used as a temporary for dealing with 17335 * x/y points in the ViewGroup.invalidateChild implementation. 17336 */ 17337 final int[] mInvalidateChildLocation = new int[2]; 17338 17339 17340 /** 17341 * Global to the view hierarchy used as a temporary for dealing with 17342 * x/y location when view is transformed. 17343 */ 17344 final float[] mTmpTransformLocation = new float[2]; 17345 17346 /** 17347 * The view tree observer used to dispatch global events like 17348 * layout, pre-draw, touch mode change, etc. 17349 */ 17350 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 17351 17352 /** 17353 * A Canvas used by the view hierarchy to perform bitmap caching. 17354 */ 17355 Canvas mCanvas; 17356 17357 /** 17358 * The view root impl. 17359 */ 17360 final ViewRootImpl mViewRootImpl; 17361 17362 /** 17363 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 17364 * handler can be used to pump events in the UI events queue. 17365 */ 17366 final Handler mHandler; 17367 17368 /** 17369 * Temporary for use in computing invalidate rectangles while 17370 * calling up the hierarchy. 17371 */ 17372 final Rect mTmpInvalRect = new Rect(); 17373 17374 /** 17375 * Temporary for use in computing hit areas with transformed views 17376 */ 17377 final RectF mTmpTransformRect = new RectF(); 17378 17379 /** 17380 * Temporary list for use in collecting focusable descendents of a view. 17381 */ 17382 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17383 17384 /** 17385 * The id of the window for accessibility purposes. 17386 */ 17387 int mAccessibilityWindowId = View.NO_ID; 17388 17389 /** 17390 * Whether to ingore not exposed for accessibility Views when 17391 * reporting the view tree to accessibility services. 17392 */ 17393 boolean mIncludeNotImportantViews; 17394 17395 /** 17396 * The drawable for highlighting accessibility focus. 17397 */ 17398 Drawable mAccessibilityFocusDrawable; 17399 17400 /** 17401 * Show where the margins, bounds and layout bounds are for each view. 17402 */ 17403 boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17404 17405 /** 17406 * Point used to compute visible regions. 17407 */ 17408 final Point mPoint = new Point(); 17409 17410 /** 17411 * Creates a new set of attachment information with the specified 17412 * events handler and thread. 17413 * 17414 * @param handler the events handler the view must use 17415 */ 17416 AttachInfo(IWindowSession session, IWindow window, 17417 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17418 mSession = session; 17419 mWindow = window; 17420 mWindowToken = window.asBinder(); 17421 mViewRootImpl = viewRootImpl; 17422 mHandler = handler; 17423 mRootCallbacks = effectPlayer; 17424 } 17425 } 17426 17427 /** 17428 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17429 * is supported. This avoids keeping too many unused fields in most 17430 * instances of View.</p> 17431 */ 17432 private static class ScrollabilityCache implements Runnable { 17433 17434 /** 17435 * Scrollbars are not visible 17436 */ 17437 public static final int OFF = 0; 17438 17439 /** 17440 * Scrollbars are visible 17441 */ 17442 public static final int ON = 1; 17443 17444 /** 17445 * Scrollbars are fading away 17446 */ 17447 public static final int FADING = 2; 17448 17449 public boolean fadeScrollBars; 17450 17451 public int fadingEdgeLength; 17452 public int scrollBarDefaultDelayBeforeFade; 17453 public int scrollBarFadeDuration; 17454 17455 public int scrollBarSize; 17456 public ScrollBarDrawable scrollBar; 17457 public float[] interpolatorValues; 17458 public View host; 17459 17460 public final Paint paint; 17461 public final Matrix matrix; 17462 public Shader shader; 17463 17464 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17465 17466 private static final float[] OPAQUE = { 255 }; 17467 private static final float[] TRANSPARENT = { 0.0f }; 17468 17469 /** 17470 * When fading should start. This time moves into the future every time 17471 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17472 */ 17473 public long fadeStartTime; 17474 17475 17476 /** 17477 * The current state of the scrollbars: ON, OFF, or FADING 17478 */ 17479 public int state = OFF; 17480 17481 private int mLastColor; 17482 17483 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17484 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17485 scrollBarSize = configuration.getScaledScrollBarSize(); 17486 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17487 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17488 17489 paint = new Paint(); 17490 matrix = new Matrix(); 17491 // use use a height of 1, and then wack the matrix each time we 17492 // actually use it. 17493 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17494 17495 paint.setShader(shader); 17496 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17497 this.host = host; 17498 } 17499 17500 public void setFadeColor(int color) { 17501 if (color != 0 && color != mLastColor) { 17502 mLastColor = color; 17503 color |= 0xFF000000; 17504 17505 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17506 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17507 17508 paint.setShader(shader); 17509 // Restore the default transfer mode (src_over) 17510 paint.setXfermode(null); 17511 } 17512 } 17513 17514 public void run() { 17515 long now = AnimationUtils.currentAnimationTimeMillis(); 17516 if (now >= fadeStartTime) { 17517 17518 // the animation fades the scrollbars out by changing 17519 // the opacity (alpha) from fully opaque to fully 17520 // transparent 17521 int nextFrame = (int) now; 17522 int framesCount = 0; 17523 17524 Interpolator interpolator = scrollBarInterpolator; 17525 17526 // Start opaque 17527 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17528 17529 // End transparent 17530 nextFrame += scrollBarFadeDuration; 17531 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17532 17533 state = FADING; 17534 17535 // Kick off the fade animation 17536 host.invalidate(true); 17537 } 17538 } 17539 } 17540 17541 /** 17542 * Resuable callback for sending 17543 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17544 */ 17545 private class SendViewScrolledAccessibilityEvent implements Runnable { 17546 public volatile boolean mIsPending; 17547 17548 public void run() { 17549 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17550 mIsPending = false; 17551 } 17552 } 17553 17554 /** 17555 * <p> 17556 * This class represents a delegate that can be registered in a {@link View} 17557 * to enhance accessibility support via composition rather via inheritance. 17558 * It is specifically targeted to widget developers that extend basic View 17559 * classes i.e. classes in package android.view, that would like their 17560 * applications to be backwards compatible. 17561 * </p> 17562 * <div class="special reference"> 17563 * <h3>Developer Guides</h3> 17564 * <p>For more information about making applications accessible, read the 17565 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17566 * developer guide.</p> 17567 * </div> 17568 * <p> 17569 * A scenario in which a developer would like to use an accessibility delegate 17570 * is overriding a method introduced in a later API version then the minimal API 17571 * version supported by the application. For example, the method 17572 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17573 * in API version 4 when the accessibility APIs were first introduced. If a 17574 * developer would like his application to run on API version 4 devices (assuming 17575 * all other APIs used by the application are version 4 or lower) and take advantage 17576 * of this method, instead of overriding the method which would break the application's 17577 * backwards compatibility, he can override the corresponding method in this 17578 * delegate and register the delegate in the target View if the API version of 17579 * the system is high enough i.e. the API version is same or higher to the API 17580 * version that introduced 17581 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17582 * </p> 17583 * <p> 17584 * Here is an example implementation: 17585 * </p> 17586 * <code><pre><p> 17587 * if (Build.VERSION.SDK_INT >= 14) { 17588 * // If the API version is equal of higher than the version in 17589 * // which onInitializeAccessibilityNodeInfo was introduced we 17590 * // register a delegate with a customized implementation. 17591 * View view = findViewById(R.id.view_id); 17592 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17593 * public void onInitializeAccessibilityNodeInfo(View host, 17594 * AccessibilityNodeInfo info) { 17595 * // Let the default implementation populate the info. 17596 * super.onInitializeAccessibilityNodeInfo(host, info); 17597 * // Set some other information. 17598 * info.setEnabled(host.isEnabled()); 17599 * } 17600 * }); 17601 * } 17602 * </code></pre></p> 17603 * <p> 17604 * This delegate contains methods that correspond to the accessibility methods 17605 * in View. If a delegate has been specified the implementation in View hands 17606 * off handling to the corresponding method in this delegate. The default 17607 * implementation the delegate methods behaves exactly as the corresponding 17608 * method in View for the case of no accessibility delegate been set. Hence, 17609 * to customize the behavior of a View method, clients can override only the 17610 * corresponding delegate method without altering the behavior of the rest 17611 * accessibility related methods of the host view. 17612 * </p> 17613 */ 17614 public static class AccessibilityDelegate { 17615 17616 /** 17617 * Sends an accessibility event of the given type. If accessibility is not 17618 * enabled this method has no effect. 17619 * <p> 17620 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17621 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17622 * been set. 17623 * </p> 17624 * 17625 * @param host The View hosting the delegate. 17626 * @param eventType The type of the event to send. 17627 * 17628 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17629 */ 17630 public void sendAccessibilityEvent(View host, int eventType) { 17631 host.sendAccessibilityEventInternal(eventType); 17632 } 17633 17634 /** 17635 * Performs the specified accessibility action on the view. For 17636 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 17637 * <p> 17638 * The default implementation behaves as 17639 * {@link View#performAccessibilityAction(int, Bundle) 17640 * View#performAccessibilityAction(int, Bundle)} for the case of 17641 * no accessibility delegate been set. 17642 * </p> 17643 * 17644 * @param action The action to perform. 17645 * @return Whether the action was performed. 17646 * 17647 * @see View#performAccessibilityAction(int, Bundle) 17648 * View#performAccessibilityAction(int, Bundle) 17649 */ 17650 public boolean performAccessibilityAction(View host, int action, Bundle args) { 17651 return host.performAccessibilityActionInternal(action, args); 17652 } 17653 17654 /** 17655 * Sends an accessibility event. This method behaves exactly as 17656 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17657 * empty {@link AccessibilityEvent} and does not perform a check whether 17658 * accessibility is enabled. 17659 * <p> 17660 * The default implementation behaves as 17661 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17662 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17663 * the case of no accessibility delegate been set. 17664 * </p> 17665 * 17666 * @param host The View hosting the delegate. 17667 * @param event The event to send. 17668 * 17669 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17670 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17671 */ 17672 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17673 host.sendAccessibilityEventUncheckedInternal(event); 17674 } 17675 17676 /** 17677 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17678 * to its children for adding their text content to the event. 17679 * <p> 17680 * The default implementation behaves as 17681 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17682 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17683 * the case of no accessibility delegate been set. 17684 * </p> 17685 * 17686 * @param host The View hosting the delegate. 17687 * @param event The event. 17688 * @return True if the event population was completed. 17689 * 17690 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17691 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17692 */ 17693 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17694 return host.dispatchPopulateAccessibilityEventInternal(event); 17695 } 17696 17697 /** 17698 * Gives a chance to the host View to populate the accessibility event with its 17699 * text content. 17700 * <p> 17701 * The default implementation behaves as 17702 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17703 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17704 * the case of no accessibility delegate been set. 17705 * </p> 17706 * 17707 * @param host The View hosting the delegate. 17708 * @param event The accessibility event which to populate. 17709 * 17710 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17711 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17712 */ 17713 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17714 host.onPopulateAccessibilityEventInternal(event); 17715 } 17716 17717 /** 17718 * Initializes an {@link AccessibilityEvent} with information about the 17719 * the host View which is the event source. 17720 * <p> 17721 * The default implementation behaves as 17722 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17723 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17724 * the case of no accessibility delegate been set. 17725 * </p> 17726 * 17727 * @param host The View hosting the delegate. 17728 * @param event The event to initialize. 17729 * 17730 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17731 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17732 */ 17733 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17734 host.onInitializeAccessibilityEventInternal(event); 17735 } 17736 17737 /** 17738 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17739 * <p> 17740 * The default implementation behaves as 17741 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17742 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17743 * the case of no accessibility delegate been set. 17744 * </p> 17745 * 17746 * @param host The View hosting the delegate. 17747 * @param info The instance to initialize. 17748 * 17749 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17750 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17751 */ 17752 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17753 host.onInitializeAccessibilityNodeInfoInternal(info); 17754 } 17755 17756 /** 17757 * Called when a child of the host View has requested sending an 17758 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17759 * to augment the event. 17760 * <p> 17761 * The default implementation behaves as 17762 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17763 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17764 * the case of no accessibility delegate been set. 17765 * </p> 17766 * 17767 * @param host The View hosting the delegate. 17768 * @param child The child which requests sending the event. 17769 * @param event The event to be sent. 17770 * @return True if the event should be sent 17771 * 17772 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17773 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17774 */ 17775 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17776 AccessibilityEvent event) { 17777 return host.onRequestSendAccessibilityEventInternal(child, event); 17778 } 17779 17780 /** 17781 * Gets the provider for managing a virtual view hierarchy rooted at this View 17782 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17783 * that explore the window content. 17784 * <p> 17785 * The default implementation behaves as 17786 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17787 * the case of no accessibility delegate been set. 17788 * </p> 17789 * 17790 * @return The provider. 17791 * 17792 * @see AccessibilityNodeProvider 17793 */ 17794 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17795 return null; 17796 } 17797 } 17798} 17799