View.java revision 139e5aa1da51b27231ab36344cf2d0dafab23f1e
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.text.TextUtils; 51import android.util.AttributeSet; 52import android.util.FloatProperty; 53import android.util.LocaleUtil; 54import android.util.Log; 55import android.util.Pool; 56import android.util.Poolable; 57import android.util.PoolableManager; 58import android.util.Pools; 59import android.util.Property; 60import android.util.SparseArray; 61import android.util.TypedValue; 62import android.view.ContextMenu.ContextMenuInfo; 63import android.view.accessibility.AccessibilityEvent; 64import android.view.accessibility.AccessibilityEventSource; 65import android.view.accessibility.AccessibilityManager; 66import android.view.accessibility.AccessibilityNodeInfo; 67import android.view.accessibility.AccessibilityNodeProvider; 68import android.view.animation.Animation; 69import android.view.animation.AnimationUtils; 70import android.view.animation.Transformation; 71import android.view.inputmethod.EditorInfo; 72import android.view.inputmethod.InputConnection; 73import android.view.inputmethod.InputMethodManager; 74import android.widget.ScrollBarDrawable; 75 76import static android.os.Build.VERSION_CODES.*; 77import static java.lang.Math.max; 78 79import com.android.internal.R; 80import com.android.internal.util.Predicate; 81import com.android.internal.view.menu.MenuBuilder; 82 83import java.lang.ref.WeakReference; 84import java.lang.reflect.InvocationTargetException; 85import java.lang.reflect.Method; 86import java.util.ArrayList; 87import java.util.Arrays; 88import java.util.Locale; 89import java.util.concurrent.CopyOnWriteArrayList; 90 91/** 92 * <p> 93 * This class represents the basic building block for user interface components. A View 94 * occupies a rectangular area on the screen and is responsible for drawing and 95 * event handling. View is the base class for <em>widgets</em>, which are 96 * used to create interactive UI components (buttons, text fields, etc.). The 97 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 98 * are invisible containers that hold other Views (or other ViewGroups) and define 99 * their layout properties. 100 * </p> 101 * 102 * <div class="special reference"> 103 * <h3>Developer Guides</h3> 104 * <p>For information about using this class to develop your application's user interface, 105 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 106 * </div> 107 * 108 * <a name="Using"></a> 109 * <h3>Using Views</h3> 110 * <p> 111 * All of the views in a window are arranged in a single tree. You can add views 112 * either from code or by specifying a tree of views in one or more XML layout 113 * files. There are many specialized subclasses of views that act as controls or 114 * are capable of displaying text, images, or other content. 115 * </p> 116 * <p> 117 * Once you have created a tree of views, there are typically a few types of 118 * common operations you may wish to perform: 119 * <ul> 120 * <li><strong>Set properties:</strong> for example setting the text of a 121 * {@link android.widget.TextView}. The available properties and the methods 122 * that set them will vary among the different subclasses of views. Note that 123 * properties that are known at build time can be set in the XML layout 124 * files.</li> 125 * <li><strong>Set focus:</strong> The framework will handled moving focus in 126 * response to user input. To force focus to a specific view, call 127 * {@link #requestFocus}.</li> 128 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 129 * that will be notified when something interesting happens to the view. For 130 * example, all views will let you set a listener to be notified when the view 131 * gains or loses focus. You can register such a listener using 132 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 133 * Other view subclasses offer more specialized listeners. For example, a Button 134 * exposes a listener to notify clients when the button is clicked.</li> 135 * <li><strong>Set visibility:</strong> You can hide or show views using 136 * {@link #setVisibility(int)}.</li> 137 * </ul> 138 * </p> 139 * <p><em> 140 * Note: The Android framework is responsible for measuring, laying out and 141 * drawing views. You should not call methods that perform these actions on 142 * views yourself unless you are actually implementing a 143 * {@link android.view.ViewGroup}. 144 * </em></p> 145 * 146 * <a name="Lifecycle"></a> 147 * <h3>Implementing a Custom View</h3> 148 * 149 * <p> 150 * To implement a custom view, you will usually begin by providing overrides for 151 * some of the standard methods that the framework calls on all views. You do 152 * not need to override all of these methods. In fact, you can start by just 153 * overriding {@link #onDraw(android.graphics.Canvas)}. 154 * <table border="2" width="85%" align="center" cellpadding="5"> 155 * <thead> 156 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 157 * </thead> 158 * 159 * <tbody> 160 * <tr> 161 * <td rowspan="2">Creation</td> 162 * <td>Constructors</td> 163 * <td>There is a form of the constructor that are called when the view 164 * is created from code and a form that is called when the view is 165 * inflated from a layout file. The second form should parse and apply 166 * any attributes defined in the layout file. 167 * </td> 168 * </tr> 169 * <tr> 170 * <td><code>{@link #onFinishInflate()}</code></td> 171 * <td>Called after a view and all of its children has been inflated 172 * from XML.</td> 173 * </tr> 174 * 175 * <tr> 176 * <td rowspan="3">Layout</td> 177 * <td><code>{@link #onMeasure(int, int)}</code></td> 178 * <td>Called to determine the size requirements for this view and all 179 * of its children. 180 * </td> 181 * </tr> 182 * <tr> 183 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 184 * <td>Called when this view should assign a size and position to all 185 * of its children. 186 * </td> 187 * </tr> 188 * <tr> 189 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 190 * <td>Called when the size of this view has changed. 191 * </td> 192 * </tr> 193 * 194 * <tr> 195 * <td>Drawing</td> 196 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 197 * <td>Called when the view should render its content. 198 * </td> 199 * </tr> 200 * 201 * <tr> 202 * <td rowspan="4">Event processing</td> 203 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 204 * <td>Called when a new key event occurs. 205 * </td> 206 * </tr> 207 * <tr> 208 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 209 * <td>Called when a key up event occurs. 210 * </td> 211 * </tr> 212 * <tr> 213 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 214 * <td>Called when a trackball motion event occurs. 215 * </td> 216 * </tr> 217 * <tr> 218 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 219 * <td>Called when a touch screen motion event occurs. 220 * </td> 221 * </tr> 222 * 223 * <tr> 224 * <td rowspan="2">Focus</td> 225 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 226 * <td>Called when the view gains or loses focus. 227 * </td> 228 * </tr> 229 * 230 * <tr> 231 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 232 * <td>Called when the window containing the view gains or loses focus. 233 * </td> 234 * </tr> 235 * 236 * <tr> 237 * <td rowspan="3">Attaching</td> 238 * <td><code>{@link #onAttachedToWindow()}</code></td> 239 * <td>Called when the view is attached to a window. 240 * </td> 241 * </tr> 242 * 243 * <tr> 244 * <td><code>{@link #onDetachedFromWindow}</code></td> 245 * <td>Called when the view is detached from its window. 246 * </td> 247 * </tr> 248 * 249 * <tr> 250 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 251 * <td>Called when the visibility of the window containing the view 252 * has changed. 253 * </td> 254 * </tr> 255 * </tbody> 256 * 257 * </table> 258 * </p> 259 * 260 * <a name="IDs"></a> 261 * <h3>IDs</h3> 262 * Views may have an integer id associated with them. These ids are typically 263 * assigned in the layout XML files, and are used to find specific views within 264 * the view tree. A common pattern is to: 265 * <ul> 266 * <li>Define a Button in the layout file and assign it a unique ID. 267 * <pre> 268 * <Button 269 * android:id="@+id/my_button" 270 * android:layout_width="wrap_content" 271 * android:layout_height="wrap_content" 272 * android:text="@string/my_button_text"/> 273 * </pre></li> 274 * <li>From the onCreate method of an Activity, find the Button 275 * <pre class="prettyprint"> 276 * Button myButton = (Button) findViewById(R.id.my_button); 277 * </pre></li> 278 * </ul> 279 * <p> 280 * View IDs need not be unique throughout the tree, but it is good practice to 281 * ensure that they are at least unique within the part of the tree you are 282 * searching. 283 * </p> 284 * 285 * <a name="Position"></a> 286 * <h3>Position</h3> 287 * <p> 288 * The geometry of a view is that of a rectangle. A view has a location, 289 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 290 * two dimensions, expressed as a width and a height. The unit for location 291 * and dimensions is the pixel. 292 * </p> 293 * 294 * <p> 295 * It is possible to retrieve the location of a view by invoking the methods 296 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 297 * coordinate of the rectangle representing the view. The latter returns the 298 * top, or Y, coordinate of the rectangle representing the view. These methods 299 * both return the location of the view relative to its parent. For instance, 300 * when getLeft() returns 20, that means the view is located 20 pixels to the 301 * right of the left edge of its direct parent. 302 * </p> 303 * 304 * <p> 305 * In addition, several convenience methods are offered to avoid unnecessary 306 * computations, namely {@link #getRight()} and {@link #getBottom()}. 307 * These methods return the coordinates of the right and bottom edges of the 308 * rectangle representing the view. For instance, calling {@link #getRight()} 309 * is similar to the following computation: <code>getLeft() + getWidth()</code> 310 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 311 * </p> 312 * 313 * <a name="SizePaddingMargins"></a> 314 * <h3>Size, padding and margins</h3> 315 * <p> 316 * The size of a view is expressed with a width and a height. A view actually 317 * possess two pairs of width and height values. 318 * </p> 319 * 320 * <p> 321 * The first pair is known as <em>measured width</em> and 322 * <em>measured height</em>. These dimensions define how big a view wants to be 323 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 324 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 325 * and {@link #getMeasuredHeight()}. 326 * </p> 327 * 328 * <p> 329 * The second pair is simply known as <em>width</em> and <em>height</em>, or 330 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 331 * dimensions define the actual size of the view on screen, at drawing time and 332 * after layout. These values may, but do not have to, be different from the 333 * measured width and height. The width and height can be obtained by calling 334 * {@link #getWidth()} and {@link #getHeight()}. 335 * </p> 336 * 337 * <p> 338 * To measure its dimensions, a view takes into account its padding. The padding 339 * is expressed in pixels for the left, top, right and bottom parts of the view. 340 * Padding can be used to offset the content of the view by a specific amount of 341 * pixels. For instance, a left padding of 2 will push the view's content by 342 * 2 pixels to the right of the left edge. Padding can be set using the 343 * {@link #setPadding(int, int, int, int)} method and queried by calling 344 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, {@link #getPaddingRight()}, 345 * {@link #getPaddingBottom()}. 346 * </p> 347 * 348 * <p> 349 * Even though a view can define a padding, it does not provide any support for 350 * margins. However, view groups provide such a support. Refer to 351 * {@link android.view.ViewGroup} and 352 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 353 * </p> 354 * 355 * <a name="Layout"></a> 356 * <h3>Layout</h3> 357 * <p> 358 * Layout is a two pass process: a measure pass and a layout pass. The measuring 359 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 360 * of the view tree. Each view pushes dimension specifications down the tree 361 * during the recursion. At the end of the measure pass, every view has stored 362 * its measurements. The second pass happens in 363 * {@link #layout(int,int,int,int)} and is also top-down. During 364 * this pass each parent is responsible for positioning all of its children 365 * using the sizes computed in the measure pass. 366 * </p> 367 * 368 * <p> 369 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 370 * {@link #getMeasuredHeight()} values must be set, along with those for all of 371 * that view's descendants. A view's measured width and measured height values 372 * must respect the constraints imposed by the view's parents. This guarantees 373 * that at the end of the measure pass, all parents accept all of their 374 * children's measurements. A parent view may call measure() more than once on 375 * its children. For example, the parent may measure each child once with 376 * unspecified dimensions to find out how big they want to be, then call 377 * measure() on them again with actual numbers if the sum of all the children's 378 * unconstrained sizes is too big or too small. 379 * </p> 380 * 381 * <p> 382 * The measure pass uses two classes to communicate dimensions. The 383 * {@link MeasureSpec} class is used by views to tell their parents how they 384 * want to be measured and positioned. The base LayoutParams class just 385 * describes how big the view wants to be for both width and height. For each 386 * dimension, it can specify one of: 387 * <ul> 388 * <li> an exact number 389 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 390 * (minus padding) 391 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 392 * enclose its content (plus padding). 393 * </ul> 394 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 395 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 396 * an X and Y value. 397 * </p> 398 * 399 * <p> 400 * MeasureSpecs are used to push requirements down the tree from parent to 401 * child. A MeasureSpec can be in one of three modes: 402 * <ul> 403 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 404 * of a child view. For example, a LinearLayout may call measure() on its child 405 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 406 * tall the child view wants to be given a width of 240 pixels. 407 * <li>EXACTLY: This is used by the parent to impose an exact size on the 408 * child. The child must use this size, and guarantee that all of its 409 * descendants will fit within this size. 410 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 411 * child. The child must gurantee that it and all of its descendants will fit 412 * within this size. 413 * </ul> 414 * </p> 415 * 416 * <p> 417 * To intiate a layout, call {@link #requestLayout}. This method is typically 418 * called by a view on itself when it believes that is can no longer fit within 419 * its current bounds. 420 * </p> 421 * 422 * <a name="Drawing"></a> 423 * <h3>Drawing</h3> 424 * <p> 425 * Drawing is handled by walking the tree and rendering each view that 426 * intersects the invalid region. Because the tree is traversed in-order, 427 * this means that parents will draw before (i.e., behind) their children, with 428 * siblings drawn in the order they appear in the tree. 429 * If you set a background drawable for a View, then the View will draw it for you 430 * before calling back to its <code>onDraw()</code> method. 431 * </p> 432 * 433 * <p> 434 * Note that the framework will not draw views that are not in the invalid region. 435 * </p> 436 * 437 * <p> 438 * To force a view to draw, call {@link #invalidate()}. 439 * </p> 440 * 441 * <a name="EventHandlingThreading"></a> 442 * <h3>Event Handling and Threading</h3> 443 * <p> 444 * The basic cycle of a view is as follows: 445 * <ol> 446 * <li>An event comes in and is dispatched to the appropriate view. The view 447 * handles the event and notifies any listeners.</li> 448 * <li>If in the course of processing the event, the view's bounds may need 449 * to be changed, the view will call {@link #requestLayout()}.</li> 450 * <li>Similarly, if in the course of processing the event the view's appearance 451 * may need to be changed, the view will call {@link #invalidate()}.</li> 452 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 453 * the framework will take care of measuring, laying out, and drawing the tree 454 * as appropriate.</li> 455 * </ol> 456 * </p> 457 * 458 * <p><em>Note: The entire view tree is single threaded. You must always be on 459 * the UI thread when calling any method on any view.</em> 460 * If you are doing work on other threads and want to update the state of a view 461 * from that thread, you should use a {@link Handler}. 462 * </p> 463 * 464 * <a name="FocusHandling"></a> 465 * <h3>Focus Handling</h3> 466 * <p> 467 * The framework will handle routine focus movement in response to user input. 468 * This includes changing the focus as views are removed or hidden, or as new 469 * views become available. Views indicate their willingness to take focus 470 * through the {@link #isFocusable} method. To change whether a view can take 471 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 472 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 473 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 474 * </p> 475 * <p> 476 * Focus movement is based on an algorithm which finds the nearest neighbor in a 477 * given direction. In rare cases, the default algorithm may not match the 478 * intended behavior of the developer. In these situations, you can provide 479 * explicit overrides by using these XML attributes in the layout file: 480 * <pre> 481 * nextFocusDown 482 * nextFocusLeft 483 * nextFocusRight 484 * nextFocusUp 485 * </pre> 486 * </p> 487 * 488 * 489 * <p> 490 * To get a particular view to take focus, call {@link #requestFocus()}. 491 * </p> 492 * 493 * <a name="TouchMode"></a> 494 * <h3>Touch Mode</h3> 495 * <p> 496 * When a user is navigating a user interface via directional keys such as a D-pad, it is 497 * necessary to give focus to actionable items such as buttons so the user can see 498 * what will take input. If the device has touch capabilities, however, and the user 499 * begins interacting with the interface by touching it, it is no longer necessary to 500 * always highlight, or give focus to, a particular view. This motivates a mode 501 * for interaction named 'touch mode'. 502 * </p> 503 * <p> 504 * For a touch capable device, once the user touches the screen, the device 505 * will enter touch mode. From this point onward, only views for which 506 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 507 * Other views that are touchable, like buttons, will not take focus when touched; they will 508 * only fire the on click listeners. 509 * </p> 510 * <p> 511 * Any time a user hits a directional key, such as a D-pad direction, the view device will 512 * exit touch mode, and find a view to take focus, so that the user may resume interacting 513 * with the user interface without touching the screen again. 514 * </p> 515 * <p> 516 * The touch mode state is maintained across {@link android.app.Activity}s. Call 517 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 518 * </p> 519 * 520 * <a name="Scrolling"></a> 521 * <h3>Scrolling</h3> 522 * <p> 523 * The framework provides basic support for views that wish to internally 524 * scroll their content. This includes keeping track of the X and Y scroll 525 * offset as well as mechanisms for drawing scrollbars. See 526 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 527 * {@link #awakenScrollBars()} for more details. 528 * </p> 529 * 530 * <a name="Tags"></a> 531 * <h3>Tags</h3> 532 * <p> 533 * Unlike IDs, tags are not used to identify views. Tags are essentially an 534 * extra piece of information that can be associated with a view. They are most 535 * often used as a convenience to store data related to views in the views 536 * themselves rather than by putting them in a separate structure. 537 * </p> 538 * 539 * <a name="Properties"></a> 540 * <h3>Properties</h3> 541 * <p> 542 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 543 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 544 * available both in the {@link Property} form as well as in similarly-named setter/getter 545 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 546 * be used to set persistent state associated with these rendering-related properties on the view. 547 * The properties and methods can also be used in conjunction with 548 * {@link android.animation.Animator Animator}-based animations, described more in the 549 * <a href="#Animation">Animation</a> section. 550 * </p> 551 * 552 * <a name="Animation"></a> 553 * <h3>Animation</h3> 554 * <p> 555 * Starting with Android 3.0, the preferred way of animating views is to use the 556 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 557 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 558 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 559 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 560 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 561 * makes animating these View properties particularly easy and efficient. 562 * </p> 563 * <p> 564 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 565 * You can attach an {@link Animation} object to a view using 566 * {@link #setAnimation(Animation)} or 567 * {@link #startAnimation(Animation)}. The animation can alter the scale, 568 * rotation, translation and alpha of a view over time. If the animation is 569 * attached to a view that has children, the animation will affect the entire 570 * subtree rooted by that node. When an animation is started, the framework will 571 * take care of redrawing the appropriate views until the animation completes. 572 * </p> 573 * 574 * <a name="Security"></a> 575 * <h3>Security</h3> 576 * <p> 577 * Sometimes it is essential that an application be able to verify that an action 578 * is being performed with the full knowledge and consent of the user, such as 579 * granting a permission request, making a purchase or clicking on an advertisement. 580 * Unfortunately, a malicious application could try to spoof the user into 581 * performing these actions, unaware, by concealing the intended purpose of the view. 582 * As a remedy, the framework offers a touch filtering mechanism that can be used to 583 * improve the security of views that provide access to sensitive functionality. 584 * </p><p> 585 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 586 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 587 * will discard touches that are received whenever the view's window is obscured by 588 * another visible window. As a result, the view will not receive touches whenever a 589 * toast, dialog or other window appears above the view's window. 590 * </p><p> 591 * For more fine-grained control over security, consider overriding the 592 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 593 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 594 * </p> 595 * 596 * @attr ref android.R.styleable#View_alpha 597 * @attr ref android.R.styleable#View_background 598 * @attr ref android.R.styleable#View_clickable 599 * @attr ref android.R.styleable#View_contentDescription 600 * @attr ref android.R.styleable#View_drawingCacheQuality 601 * @attr ref android.R.styleable#View_duplicateParentState 602 * @attr ref android.R.styleable#View_id 603 * @attr ref android.R.styleable#View_requiresFadingEdge 604 * @attr ref android.R.styleable#View_fadeScrollbars 605 * @attr ref android.R.styleable#View_fadingEdgeLength 606 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 607 * @attr ref android.R.styleable#View_fitsSystemWindows 608 * @attr ref android.R.styleable#View_isScrollContainer 609 * @attr ref android.R.styleable#View_focusable 610 * @attr ref android.R.styleable#View_focusableInTouchMode 611 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 612 * @attr ref android.R.styleable#View_keepScreenOn 613 * @attr ref android.R.styleable#View_layerType 614 * @attr ref android.R.styleable#View_longClickable 615 * @attr ref android.R.styleable#View_minHeight 616 * @attr ref android.R.styleable#View_minWidth 617 * @attr ref android.R.styleable#View_nextFocusDown 618 * @attr ref android.R.styleable#View_nextFocusLeft 619 * @attr ref android.R.styleable#View_nextFocusRight 620 * @attr ref android.R.styleable#View_nextFocusUp 621 * @attr ref android.R.styleable#View_onClick 622 * @attr ref android.R.styleable#View_padding 623 * @attr ref android.R.styleable#View_paddingBottom 624 * @attr ref android.R.styleable#View_paddingLeft 625 * @attr ref android.R.styleable#View_paddingRight 626 * @attr ref android.R.styleable#View_paddingTop 627 * @attr ref android.R.styleable#View_saveEnabled 628 * @attr ref android.R.styleable#View_rotation 629 * @attr ref android.R.styleable#View_rotationX 630 * @attr ref android.R.styleable#View_rotationY 631 * @attr ref android.R.styleable#View_scaleX 632 * @attr ref android.R.styleable#View_scaleY 633 * @attr ref android.R.styleable#View_scrollX 634 * @attr ref android.R.styleable#View_scrollY 635 * @attr ref android.R.styleable#View_scrollbarSize 636 * @attr ref android.R.styleable#View_scrollbarStyle 637 * @attr ref android.R.styleable#View_scrollbars 638 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 639 * @attr ref android.R.styleable#View_scrollbarFadeDuration 640 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 641 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 642 * @attr ref android.R.styleable#View_scrollbarThumbVertical 643 * @attr ref android.R.styleable#View_scrollbarTrackVertical 644 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 645 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 646 * @attr ref android.R.styleable#View_soundEffectsEnabled 647 * @attr ref android.R.styleable#View_tag 648 * @attr ref android.R.styleable#View_transformPivotX 649 * @attr ref android.R.styleable#View_transformPivotY 650 * @attr ref android.R.styleable#View_translationX 651 * @attr ref android.R.styleable#View_translationY 652 * @attr ref android.R.styleable#View_visibility 653 * 654 * @see android.view.ViewGroup 655 */ 656public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 657 AccessibilityEventSource { 658 private static final boolean DBG = false; 659 660 /** 661 * The logging tag used by this class with android.util.Log. 662 */ 663 protected static final String VIEW_LOG_TAG = "View"; 664 665 /** 666 * When set to true, apps will draw debugging information about their layouts. 667 * 668 * @hide 669 */ 670 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 671 672 /** 673 * Used to mark a View that has no ID. 674 */ 675 public static final int NO_ID = -1; 676 677 /** 678 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 679 * calling setFlags. 680 */ 681 private static final int NOT_FOCUSABLE = 0x00000000; 682 683 /** 684 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 685 * setFlags. 686 */ 687 private static final int FOCUSABLE = 0x00000001; 688 689 /** 690 * Mask for use with setFlags indicating bits used for focus. 691 */ 692 private static final int FOCUSABLE_MASK = 0x00000001; 693 694 /** 695 * This view will adjust its padding to fit sytem windows (e.g. status bar) 696 */ 697 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 698 699 /** 700 * This view is visible. 701 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 702 * android:visibility}. 703 */ 704 public static final int VISIBLE = 0x00000000; 705 706 /** 707 * This view is invisible, but it still takes up space for layout purposes. 708 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 709 * android:visibility}. 710 */ 711 public static final int INVISIBLE = 0x00000004; 712 713 /** 714 * This view is invisible, and it doesn't take any space for layout 715 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 716 * android:visibility}. 717 */ 718 public static final int GONE = 0x00000008; 719 720 /** 721 * Mask for use with setFlags indicating bits used for visibility. 722 * {@hide} 723 */ 724 static final int VISIBILITY_MASK = 0x0000000C; 725 726 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 727 728 /** 729 * This view is enabled. Interpretation varies by subclass. 730 * Use with ENABLED_MASK when calling setFlags. 731 * {@hide} 732 */ 733 static final int ENABLED = 0x00000000; 734 735 /** 736 * This view is disabled. Interpretation varies by subclass. 737 * Use with ENABLED_MASK when calling setFlags. 738 * {@hide} 739 */ 740 static final int DISABLED = 0x00000020; 741 742 /** 743 * Mask for use with setFlags indicating bits used for indicating whether 744 * this view is enabled 745 * {@hide} 746 */ 747 static final int ENABLED_MASK = 0x00000020; 748 749 /** 750 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 751 * called and further optimizations will be performed. It is okay to have 752 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 753 * {@hide} 754 */ 755 static final int WILL_NOT_DRAW = 0x00000080; 756 757 /** 758 * Mask for use with setFlags indicating bits used for indicating whether 759 * this view is will draw 760 * {@hide} 761 */ 762 static final int DRAW_MASK = 0x00000080; 763 764 /** 765 * <p>This view doesn't show scrollbars.</p> 766 * {@hide} 767 */ 768 static final int SCROLLBARS_NONE = 0x00000000; 769 770 /** 771 * <p>This view shows horizontal scrollbars.</p> 772 * {@hide} 773 */ 774 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 775 776 /** 777 * <p>This view shows vertical scrollbars.</p> 778 * {@hide} 779 */ 780 static final int SCROLLBARS_VERTICAL = 0x00000200; 781 782 /** 783 * <p>Mask for use with setFlags indicating bits used for indicating which 784 * scrollbars are enabled.</p> 785 * {@hide} 786 */ 787 static final int SCROLLBARS_MASK = 0x00000300; 788 789 /** 790 * Indicates that the view should filter touches when its window is obscured. 791 * Refer to the class comments for more information about this security feature. 792 * {@hide} 793 */ 794 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 795 796 /** 797 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 798 * that they are optional and should be skipped if the window has 799 * requested system UI flags that ignore those insets for layout. 800 */ 801 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 802 803 /** 804 * <p>This view doesn't show fading edges.</p> 805 * {@hide} 806 */ 807 static final int FADING_EDGE_NONE = 0x00000000; 808 809 /** 810 * <p>This view shows horizontal fading edges.</p> 811 * {@hide} 812 */ 813 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 814 815 /** 816 * <p>This view shows vertical fading edges.</p> 817 * {@hide} 818 */ 819 static final int FADING_EDGE_VERTICAL = 0x00002000; 820 821 /** 822 * <p>Mask for use with setFlags indicating bits used for indicating which 823 * fading edges are enabled.</p> 824 * {@hide} 825 */ 826 static final int FADING_EDGE_MASK = 0x00003000; 827 828 /** 829 * <p>Indicates this view can be clicked. When clickable, a View reacts 830 * to clicks by notifying the OnClickListener.<p> 831 * {@hide} 832 */ 833 static final int CLICKABLE = 0x00004000; 834 835 /** 836 * <p>Indicates this view is caching its drawing into a bitmap.</p> 837 * {@hide} 838 */ 839 static final int DRAWING_CACHE_ENABLED = 0x00008000; 840 841 /** 842 * <p>Indicates that no icicle should be saved for this view.<p> 843 * {@hide} 844 */ 845 static final int SAVE_DISABLED = 0x000010000; 846 847 /** 848 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 849 * property.</p> 850 * {@hide} 851 */ 852 static final int SAVE_DISABLED_MASK = 0x000010000; 853 854 /** 855 * <p>Indicates that no drawing cache should ever be created for this view.<p> 856 * {@hide} 857 */ 858 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 859 860 /** 861 * <p>Indicates this view can take / keep focus when int touch mode.</p> 862 * {@hide} 863 */ 864 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 865 866 /** 867 * <p>Enables low quality mode for the drawing cache.</p> 868 */ 869 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 870 871 /** 872 * <p>Enables high quality mode for the drawing cache.</p> 873 */ 874 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 875 876 /** 877 * <p>Enables automatic quality mode for the drawing cache.</p> 878 */ 879 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 880 881 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 882 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 883 }; 884 885 /** 886 * <p>Mask for use with setFlags indicating bits used for the cache 887 * quality property.</p> 888 * {@hide} 889 */ 890 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 891 892 /** 893 * <p> 894 * Indicates this view can be long clicked. When long clickable, a View 895 * reacts to long clicks by notifying the OnLongClickListener or showing a 896 * context menu. 897 * </p> 898 * {@hide} 899 */ 900 static final int LONG_CLICKABLE = 0x00200000; 901 902 /** 903 * <p>Indicates that this view gets its drawable states from its direct parent 904 * and ignores its original internal states.</p> 905 * 906 * @hide 907 */ 908 static final int DUPLICATE_PARENT_STATE = 0x00400000; 909 910 /** 911 * The scrollbar style to display the scrollbars inside the content area, 912 * without increasing the padding. The scrollbars will be overlaid with 913 * translucency on the view's content. 914 */ 915 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 916 917 /** 918 * The scrollbar style to display the scrollbars inside the padded area, 919 * increasing the padding of the view. The scrollbars will not overlap the 920 * content area of the view. 921 */ 922 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 923 924 /** 925 * The scrollbar style to display the scrollbars at the edge of the view, 926 * without increasing the padding. The scrollbars will be overlaid with 927 * translucency. 928 */ 929 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 930 931 /** 932 * The scrollbar style to display the scrollbars at the edge of the view, 933 * increasing the padding of the view. The scrollbars will only overlap the 934 * background, if any. 935 */ 936 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 937 938 /** 939 * Mask to check if the scrollbar style is overlay or inset. 940 * {@hide} 941 */ 942 static final int SCROLLBARS_INSET_MASK = 0x01000000; 943 944 /** 945 * Mask to check if the scrollbar style is inside or outside. 946 * {@hide} 947 */ 948 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 949 950 /** 951 * Mask for scrollbar style. 952 * {@hide} 953 */ 954 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 955 956 /** 957 * View flag indicating that the screen should remain on while the 958 * window containing this view is visible to the user. This effectively 959 * takes care of automatically setting the WindowManager's 960 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 961 */ 962 public static final int KEEP_SCREEN_ON = 0x04000000; 963 964 /** 965 * View flag indicating whether this view should have sound effects enabled 966 * for events such as clicking and touching. 967 */ 968 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 969 970 /** 971 * View flag indicating whether this view should have haptic feedback 972 * enabled for events such as long presses. 973 */ 974 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 975 976 /** 977 * <p>Indicates that the view hierarchy should stop saving state when 978 * it reaches this view. If state saving is initiated immediately at 979 * the view, it will be allowed. 980 * {@hide} 981 */ 982 static final int PARENT_SAVE_DISABLED = 0x20000000; 983 984 /** 985 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 986 * {@hide} 987 */ 988 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 989 990 /** 991 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 992 * should add all focusable Views regardless if they are focusable in touch mode. 993 */ 994 public static final int FOCUSABLES_ALL = 0x00000000; 995 996 /** 997 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 998 * should add only Views focusable in touch mode. 999 */ 1000 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1001 1002 /** 1003 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1004 * should add only accessibility focusable Views. 1005 * 1006 * @hide 1007 */ 1008 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1009 1010 /** 1011 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1012 * item. 1013 */ 1014 public static final int FOCUS_BACKWARD = 0x00000001; 1015 1016 /** 1017 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1018 * item. 1019 */ 1020 public static final int FOCUS_FORWARD = 0x00000002; 1021 1022 /** 1023 * Use with {@link #focusSearch(int)}. Move focus to the left. 1024 */ 1025 public static final int FOCUS_LEFT = 0x00000011; 1026 1027 /** 1028 * Use with {@link #focusSearch(int)}. Move focus up. 1029 */ 1030 public static final int FOCUS_UP = 0x00000021; 1031 1032 /** 1033 * Use with {@link #focusSearch(int)}. Move focus to the right. 1034 */ 1035 public static final int FOCUS_RIGHT = 0x00000042; 1036 1037 /** 1038 * Use with {@link #focusSearch(int)}. Move focus down. 1039 */ 1040 public static final int FOCUS_DOWN = 0x00000082; 1041 1042 // Accessibility focus directions. 1043 1044 /** 1045 * The accessibility focus which is the current user position when 1046 * interacting with the accessibility framework. 1047 */ 1048 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1049 1050 /** 1051 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1052 */ 1053 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1054 1055 /** 1056 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1057 */ 1058 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1059 1060 /** 1061 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1062 */ 1063 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1064 1065 /** 1066 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1067 */ 1068 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1069 1070 /** 1071 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1072 */ 1073 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1074 1075 /** 1076 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1077 */ 1078 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1079 1080 /** 1081 * Bits of {@link #getMeasuredWidthAndState()} and 1082 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1083 */ 1084 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1085 1086 /** 1087 * Bits of {@link #getMeasuredWidthAndState()} and 1088 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1089 */ 1090 public static final int MEASURED_STATE_MASK = 0xff000000; 1091 1092 /** 1093 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1094 * for functions that combine both width and height into a single int, 1095 * such as {@link #getMeasuredState()} and the childState argument of 1096 * {@link #resolveSizeAndState(int, int, int)}. 1097 */ 1098 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1099 1100 /** 1101 * Bit of {@link #getMeasuredWidthAndState()} and 1102 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1103 * is smaller that the space the view would like to have. 1104 */ 1105 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1106 1107 /** 1108 * Base View state sets 1109 */ 1110 // Singles 1111 /** 1112 * Indicates the view has no states set. States are used with 1113 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1114 * view depending on its state. 1115 * 1116 * @see android.graphics.drawable.Drawable 1117 * @see #getDrawableState() 1118 */ 1119 protected static final int[] EMPTY_STATE_SET; 1120 /** 1121 * Indicates the view is enabled. States are used with 1122 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1123 * view depending on its state. 1124 * 1125 * @see android.graphics.drawable.Drawable 1126 * @see #getDrawableState() 1127 */ 1128 protected static final int[] ENABLED_STATE_SET; 1129 /** 1130 * Indicates the view is focused. States are used with 1131 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1132 * view depending on its state. 1133 * 1134 * @see android.graphics.drawable.Drawable 1135 * @see #getDrawableState() 1136 */ 1137 protected static final int[] FOCUSED_STATE_SET; 1138 /** 1139 * Indicates the view is selected. States are used with 1140 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1141 * view depending on its state. 1142 * 1143 * @see android.graphics.drawable.Drawable 1144 * @see #getDrawableState() 1145 */ 1146 protected static final int[] SELECTED_STATE_SET; 1147 /** 1148 * Indicates the view is pressed. States are used with 1149 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1150 * view depending on its state. 1151 * 1152 * @see android.graphics.drawable.Drawable 1153 * @see #getDrawableState() 1154 * @hide 1155 */ 1156 protected static final int[] PRESSED_STATE_SET; 1157 /** 1158 * Indicates the view's window has focus. States are used with 1159 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1160 * view depending on its state. 1161 * 1162 * @see android.graphics.drawable.Drawable 1163 * @see #getDrawableState() 1164 */ 1165 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1166 // Doubles 1167 /** 1168 * Indicates the view is enabled and has the focus. 1169 * 1170 * @see #ENABLED_STATE_SET 1171 * @see #FOCUSED_STATE_SET 1172 */ 1173 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1174 /** 1175 * Indicates the view is enabled and selected. 1176 * 1177 * @see #ENABLED_STATE_SET 1178 * @see #SELECTED_STATE_SET 1179 */ 1180 protected static final int[] ENABLED_SELECTED_STATE_SET; 1181 /** 1182 * Indicates the view is enabled and that its window has focus. 1183 * 1184 * @see #ENABLED_STATE_SET 1185 * @see #WINDOW_FOCUSED_STATE_SET 1186 */ 1187 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1188 /** 1189 * Indicates the view is focused and selected. 1190 * 1191 * @see #FOCUSED_STATE_SET 1192 * @see #SELECTED_STATE_SET 1193 */ 1194 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1195 /** 1196 * Indicates the view has the focus and that its window has the focus. 1197 * 1198 * @see #FOCUSED_STATE_SET 1199 * @see #WINDOW_FOCUSED_STATE_SET 1200 */ 1201 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1202 /** 1203 * Indicates the view is selected and that its window has the focus. 1204 * 1205 * @see #SELECTED_STATE_SET 1206 * @see #WINDOW_FOCUSED_STATE_SET 1207 */ 1208 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1209 // Triples 1210 /** 1211 * Indicates the view is enabled, focused and selected. 1212 * 1213 * @see #ENABLED_STATE_SET 1214 * @see #FOCUSED_STATE_SET 1215 * @see #SELECTED_STATE_SET 1216 */ 1217 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1218 /** 1219 * Indicates the view is enabled, focused and its window has the focus. 1220 * 1221 * @see #ENABLED_STATE_SET 1222 * @see #FOCUSED_STATE_SET 1223 * @see #WINDOW_FOCUSED_STATE_SET 1224 */ 1225 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1226 /** 1227 * Indicates the view is enabled, selected and its window has the focus. 1228 * 1229 * @see #ENABLED_STATE_SET 1230 * @see #SELECTED_STATE_SET 1231 * @see #WINDOW_FOCUSED_STATE_SET 1232 */ 1233 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1234 /** 1235 * Indicates the view is focused, selected and its window has the focus. 1236 * 1237 * @see #FOCUSED_STATE_SET 1238 * @see #SELECTED_STATE_SET 1239 * @see #WINDOW_FOCUSED_STATE_SET 1240 */ 1241 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1242 /** 1243 * Indicates the view is enabled, focused, selected and its window 1244 * has the focus. 1245 * 1246 * @see #ENABLED_STATE_SET 1247 * @see #FOCUSED_STATE_SET 1248 * @see #SELECTED_STATE_SET 1249 * @see #WINDOW_FOCUSED_STATE_SET 1250 */ 1251 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1252 /** 1253 * Indicates the view is pressed and its window has the focus. 1254 * 1255 * @see #PRESSED_STATE_SET 1256 * @see #WINDOW_FOCUSED_STATE_SET 1257 */ 1258 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1259 /** 1260 * Indicates the view is pressed and selected. 1261 * 1262 * @see #PRESSED_STATE_SET 1263 * @see #SELECTED_STATE_SET 1264 */ 1265 protected static final int[] PRESSED_SELECTED_STATE_SET; 1266 /** 1267 * Indicates the view is pressed, selected and its window has the focus. 1268 * 1269 * @see #PRESSED_STATE_SET 1270 * @see #SELECTED_STATE_SET 1271 * @see #WINDOW_FOCUSED_STATE_SET 1272 */ 1273 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1274 /** 1275 * Indicates the view is pressed and focused. 1276 * 1277 * @see #PRESSED_STATE_SET 1278 * @see #FOCUSED_STATE_SET 1279 */ 1280 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1281 /** 1282 * Indicates the view is pressed, focused and its window has the focus. 1283 * 1284 * @see #PRESSED_STATE_SET 1285 * @see #FOCUSED_STATE_SET 1286 * @see #WINDOW_FOCUSED_STATE_SET 1287 */ 1288 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1289 /** 1290 * Indicates the view is pressed, focused and selected. 1291 * 1292 * @see #PRESSED_STATE_SET 1293 * @see #SELECTED_STATE_SET 1294 * @see #FOCUSED_STATE_SET 1295 */ 1296 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1297 /** 1298 * Indicates the view is pressed, focused, selected and its window has the focus. 1299 * 1300 * @see #PRESSED_STATE_SET 1301 * @see #FOCUSED_STATE_SET 1302 * @see #SELECTED_STATE_SET 1303 * @see #WINDOW_FOCUSED_STATE_SET 1304 */ 1305 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1306 /** 1307 * Indicates the view is pressed and enabled. 1308 * 1309 * @see #PRESSED_STATE_SET 1310 * @see #ENABLED_STATE_SET 1311 */ 1312 protected static final int[] PRESSED_ENABLED_STATE_SET; 1313 /** 1314 * Indicates the view is pressed, enabled and its window has the focus. 1315 * 1316 * @see #PRESSED_STATE_SET 1317 * @see #ENABLED_STATE_SET 1318 * @see #WINDOW_FOCUSED_STATE_SET 1319 */ 1320 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1321 /** 1322 * Indicates the view is pressed, enabled and selected. 1323 * 1324 * @see #PRESSED_STATE_SET 1325 * @see #ENABLED_STATE_SET 1326 * @see #SELECTED_STATE_SET 1327 */ 1328 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1329 /** 1330 * Indicates the view is pressed, enabled, selected and its window has the 1331 * focus. 1332 * 1333 * @see #PRESSED_STATE_SET 1334 * @see #ENABLED_STATE_SET 1335 * @see #SELECTED_STATE_SET 1336 * @see #WINDOW_FOCUSED_STATE_SET 1337 */ 1338 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1339 /** 1340 * Indicates the view is pressed, enabled and focused. 1341 * 1342 * @see #PRESSED_STATE_SET 1343 * @see #ENABLED_STATE_SET 1344 * @see #FOCUSED_STATE_SET 1345 */ 1346 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1347 /** 1348 * Indicates the view is pressed, enabled, focused and its window has the 1349 * focus. 1350 * 1351 * @see #PRESSED_STATE_SET 1352 * @see #ENABLED_STATE_SET 1353 * @see #FOCUSED_STATE_SET 1354 * @see #WINDOW_FOCUSED_STATE_SET 1355 */ 1356 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1357 /** 1358 * Indicates the view is pressed, enabled, focused and selected. 1359 * 1360 * @see #PRESSED_STATE_SET 1361 * @see #ENABLED_STATE_SET 1362 * @see #SELECTED_STATE_SET 1363 * @see #FOCUSED_STATE_SET 1364 */ 1365 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1366 /** 1367 * Indicates the view is pressed, enabled, focused, selected and its window 1368 * has the focus. 1369 * 1370 * @see #PRESSED_STATE_SET 1371 * @see #ENABLED_STATE_SET 1372 * @see #SELECTED_STATE_SET 1373 * @see #FOCUSED_STATE_SET 1374 * @see #WINDOW_FOCUSED_STATE_SET 1375 */ 1376 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1377 1378 /** 1379 * The order here is very important to {@link #getDrawableState()} 1380 */ 1381 private static final int[][] VIEW_STATE_SETS; 1382 1383 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1384 static final int VIEW_STATE_SELECTED = 1 << 1; 1385 static final int VIEW_STATE_FOCUSED = 1 << 2; 1386 static final int VIEW_STATE_ENABLED = 1 << 3; 1387 static final int VIEW_STATE_PRESSED = 1 << 4; 1388 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1389 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1390 static final int VIEW_STATE_HOVERED = 1 << 7; 1391 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1392 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1393 1394 static final int[] VIEW_STATE_IDS = new int[] { 1395 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1396 R.attr.state_selected, VIEW_STATE_SELECTED, 1397 R.attr.state_focused, VIEW_STATE_FOCUSED, 1398 R.attr.state_enabled, VIEW_STATE_ENABLED, 1399 R.attr.state_pressed, VIEW_STATE_PRESSED, 1400 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1401 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1402 R.attr.state_hovered, VIEW_STATE_HOVERED, 1403 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1404 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1405 }; 1406 1407 static { 1408 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1409 throw new IllegalStateException( 1410 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1411 } 1412 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1413 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1414 int viewState = R.styleable.ViewDrawableStates[i]; 1415 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1416 if (VIEW_STATE_IDS[j] == viewState) { 1417 orderedIds[i * 2] = viewState; 1418 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1419 } 1420 } 1421 } 1422 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1423 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1424 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1425 int numBits = Integer.bitCount(i); 1426 int[] set = new int[numBits]; 1427 int pos = 0; 1428 for (int j = 0; j < orderedIds.length; j += 2) { 1429 if ((i & orderedIds[j+1]) != 0) { 1430 set[pos++] = orderedIds[j]; 1431 } 1432 } 1433 VIEW_STATE_SETS[i] = set; 1434 } 1435 1436 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1437 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1438 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1439 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1440 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1441 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1442 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1444 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1446 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1448 | VIEW_STATE_FOCUSED]; 1449 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1450 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1452 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1453 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1454 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1456 | VIEW_STATE_ENABLED]; 1457 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1459 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1461 | VIEW_STATE_ENABLED]; 1462 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1464 | VIEW_STATE_ENABLED]; 1465 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1467 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1468 1469 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1470 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1471 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1472 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1473 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1474 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1476 | VIEW_STATE_PRESSED]; 1477 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1479 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1480 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1481 | VIEW_STATE_PRESSED]; 1482 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1483 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1484 | VIEW_STATE_PRESSED]; 1485 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1486 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1487 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1488 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1489 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1490 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1491 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1492 | VIEW_STATE_PRESSED]; 1493 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1494 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1495 | VIEW_STATE_PRESSED]; 1496 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1497 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1498 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1499 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1500 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1501 | VIEW_STATE_PRESSED]; 1502 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1503 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1504 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1505 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1506 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1507 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1508 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1509 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1510 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1511 | VIEW_STATE_PRESSED]; 1512 } 1513 1514 /** 1515 * Accessibility event types that are dispatched for text population. 1516 */ 1517 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1518 AccessibilityEvent.TYPE_VIEW_CLICKED 1519 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1520 | AccessibilityEvent.TYPE_VIEW_SELECTED 1521 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1522 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1523 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1524 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1525 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1526 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1527 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED; 1528 1529 /** 1530 * Temporary Rect currently for use in setBackground(). This will probably 1531 * be extended in the future to hold our own class with more than just 1532 * a Rect. :) 1533 */ 1534 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1535 1536 /** 1537 * Map used to store views' tags. 1538 */ 1539 private SparseArray<Object> mKeyedTags; 1540 1541 /** 1542 * The next available accessiiblity id. 1543 */ 1544 private static int sNextAccessibilityViewId; 1545 1546 /** 1547 * The animation currently associated with this view. 1548 * @hide 1549 */ 1550 protected Animation mCurrentAnimation = null; 1551 1552 /** 1553 * Width as measured during measure pass. 1554 * {@hide} 1555 */ 1556 @ViewDebug.ExportedProperty(category = "measurement") 1557 int mMeasuredWidth; 1558 1559 /** 1560 * Height as measured during measure pass. 1561 * {@hide} 1562 */ 1563 @ViewDebug.ExportedProperty(category = "measurement") 1564 int mMeasuredHeight; 1565 1566 /** 1567 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1568 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1569 * its display list. This flag, used only when hw accelerated, allows us to clear the 1570 * flag while retaining this information until it's needed (at getDisplayList() time and 1571 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1572 * 1573 * {@hide} 1574 */ 1575 boolean mRecreateDisplayList = false; 1576 1577 /** 1578 * The view's identifier. 1579 * {@hide} 1580 * 1581 * @see #setId(int) 1582 * @see #getId() 1583 */ 1584 @ViewDebug.ExportedProperty(resolveId = true) 1585 int mID = NO_ID; 1586 1587 /** 1588 * The stable ID of this view for accessibility purposes. 1589 */ 1590 int mAccessibilityViewId = NO_ID; 1591 1592 /** 1593 * The view's tag. 1594 * {@hide} 1595 * 1596 * @see #setTag(Object) 1597 * @see #getTag() 1598 */ 1599 protected Object mTag; 1600 1601 // for mPrivateFlags: 1602 /** {@hide} */ 1603 static final int WANTS_FOCUS = 0x00000001; 1604 /** {@hide} */ 1605 static final int FOCUSED = 0x00000002; 1606 /** {@hide} */ 1607 static final int SELECTED = 0x00000004; 1608 /** {@hide} */ 1609 static final int IS_ROOT_NAMESPACE = 0x00000008; 1610 /** {@hide} */ 1611 static final int HAS_BOUNDS = 0x00000010; 1612 /** {@hide} */ 1613 static final int DRAWN = 0x00000020; 1614 /** 1615 * When this flag is set, this view is running an animation on behalf of its 1616 * children and should therefore not cancel invalidate requests, even if they 1617 * lie outside of this view's bounds. 1618 * 1619 * {@hide} 1620 */ 1621 static final int DRAW_ANIMATION = 0x00000040; 1622 /** {@hide} */ 1623 static final int SKIP_DRAW = 0x00000080; 1624 /** {@hide} */ 1625 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1626 /** {@hide} */ 1627 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1628 /** {@hide} */ 1629 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1630 /** {@hide} */ 1631 static final int MEASURED_DIMENSION_SET = 0x00000800; 1632 /** {@hide} */ 1633 static final int FORCE_LAYOUT = 0x00001000; 1634 /** {@hide} */ 1635 static final int LAYOUT_REQUIRED = 0x00002000; 1636 1637 private static final int PRESSED = 0x00004000; 1638 1639 /** {@hide} */ 1640 static final int DRAWING_CACHE_VALID = 0x00008000; 1641 /** 1642 * Flag used to indicate that this view should be drawn once more (and only once 1643 * more) after its animation has completed. 1644 * {@hide} 1645 */ 1646 static final int ANIMATION_STARTED = 0x00010000; 1647 1648 private static final int SAVE_STATE_CALLED = 0x00020000; 1649 1650 /** 1651 * Indicates that the View returned true when onSetAlpha() was called and that 1652 * the alpha must be restored. 1653 * {@hide} 1654 */ 1655 static final int ALPHA_SET = 0x00040000; 1656 1657 /** 1658 * Set by {@link #setScrollContainer(boolean)}. 1659 */ 1660 static final int SCROLL_CONTAINER = 0x00080000; 1661 1662 /** 1663 * Set by {@link #setScrollContainer(boolean)}. 1664 */ 1665 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1666 1667 /** 1668 * View flag indicating whether this view was invalidated (fully or partially.) 1669 * 1670 * @hide 1671 */ 1672 static final int DIRTY = 0x00200000; 1673 1674 /** 1675 * View flag indicating whether this view was invalidated by an opaque 1676 * invalidate request. 1677 * 1678 * @hide 1679 */ 1680 static final int DIRTY_OPAQUE = 0x00400000; 1681 1682 /** 1683 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1684 * 1685 * @hide 1686 */ 1687 static final int DIRTY_MASK = 0x00600000; 1688 1689 /** 1690 * Indicates whether the background is opaque. 1691 * 1692 * @hide 1693 */ 1694 static final int OPAQUE_BACKGROUND = 0x00800000; 1695 1696 /** 1697 * Indicates whether the scrollbars are opaque. 1698 * 1699 * @hide 1700 */ 1701 static final int OPAQUE_SCROLLBARS = 0x01000000; 1702 1703 /** 1704 * Indicates whether the view is opaque. 1705 * 1706 * @hide 1707 */ 1708 static final int OPAQUE_MASK = 0x01800000; 1709 1710 /** 1711 * Indicates a prepressed state; 1712 * the short time between ACTION_DOWN and recognizing 1713 * a 'real' press. Prepressed is used to recognize quick taps 1714 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1715 * 1716 * @hide 1717 */ 1718 private static final int PREPRESSED = 0x02000000; 1719 1720 /** 1721 * Indicates whether the view is temporarily detached. 1722 * 1723 * @hide 1724 */ 1725 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1726 1727 /** 1728 * Indicates that we should awaken scroll bars once attached 1729 * 1730 * @hide 1731 */ 1732 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1733 1734 /** 1735 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1736 * @hide 1737 */ 1738 private static final int HOVERED = 0x10000000; 1739 1740 /** 1741 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1742 * for transform operations 1743 * 1744 * @hide 1745 */ 1746 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1747 1748 /** {@hide} */ 1749 static final int ACTIVATED = 0x40000000; 1750 1751 /** 1752 * Indicates that this view was specifically invalidated, not just dirtied because some 1753 * child view was invalidated. The flag is used to determine when we need to recreate 1754 * a view's display list (as opposed to just returning a reference to its existing 1755 * display list). 1756 * 1757 * @hide 1758 */ 1759 static final int INVALIDATED = 0x80000000; 1760 1761 /* Masks for mPrivateFlags2 */ 1762 1763 /** 1764 * Indicates that this view has reported that it can accept the current drag's content. 1765 * Cleared when the drag operation concludes. 1766 * @hide 1767 */ 1768 static final int DRAG_CAN_ACCEPT = 0x00000001; 1769 1770 /** 1771 * Indicates that this view is currently directly under the drag location in a 1772 * drag-and-drop operation involving content that it can accept. Cleared when 1773 * the drag exits the view, or when the drag operation concludes. 1774 * @hide 1775 */ 1776 static final int DRAG_HOVERED = 0x00000002; 1777 1778 /** 1779 * Horizontal layout direction of this view is from Left to Right. 1780 * Use with {@link #setLayoutDirection}. 1781 * @hide 1782 */ 1783 public static final int LAYOUT_DIRECTION_LTR = 0; 1784 1785 /** 1786 * Horizontal layout direction of this view is from Right to Left. 1787 * Use with {@link #setLayoutDirection}. 1788 * @hide 1789 */ 1790 public static final int LAYOUT_DIRECTION_RTL = 1; 1791 1792 /** 1793 * Horizontal layout direction of this view is inherited from its parent. 1794 * Use with {@link #setLayoutDirection}. 1795 * @hide 1796 */ 1797 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1798 1799 /** 1800 * Horizontal layout direction of this view is from deduced from the default language 1801 * script for the locale. Use with {@link #setLayoutDirection}. 1802 * @hide 1803 */ 1804 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1805 1806 /** 1807 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1808 * @hide 1809 */ 1810 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1811 1812 /** 1813 * Mask for use with private flags indicating bits used for horizontal layout direction. 1814 * @hide 1815 */ 1816 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1817 1818 /** 1819 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1820 * right-to-left direction. 1821 * @hide 1822 */ 1823 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1824 1825 /** 1826 * Indicates whether the view horizontal layout direction has been resolved. 1827 * @hide 1828 */ 1829 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1830 1831 /** 1832 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1833 * @hide 1834 */ 1835 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1836 1837 /* 1838 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1839 * flag value. 1840 * @hide 1841 */ 1842 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1843 LAYOUT_DIRECTION_LTR, 1844 LAYOUT_DIRECTION_RTL, 1845 LAYOUT_DIRECTION_INHERIT, 1846 LAYOUT_DIRECTION_LOCALE 1847 }; 1848 1849 /** 1850 * Default horizontal layout direction. 1851 * @hide 1852 */ 1853 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1854 1855 /** 1856 * Indicates that the view is tracking some sort of transient state 1857 * that the app should not need to be aware of, but that the framework 1858 * should take special care to preserve. 1859 * 1860 * @hide 1861 */ 1862 static final int HAS_TRANSIENT_STATE = 0x00000100; 1863 1864 1865 /** 1866 * Text direction is inherited thru {@link ViewGroup} 1867 * @hide 1868 */ 1869 public static final int TEXT_DIRECTION_INHERIT = 0; 1870 1871 /** 1872 * Text direction is using "first strong algorithm". The first strong directional character 1873 * determines the paragraph direction. If there is no strong directional character, the 1874 * paragraph direction is the view's resolved layout direction. 1875 * @hide 1876 */ 1877 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1878 1879 /** 1880 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1881 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1882 * If there are neither, the paragraph direction is the view's resolved layout direction. 1883 * @hide 1884 */ 1885 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1886 1887 /** 1888 * Text direction is forced to LTR. 1889 * @hide 1890 */ 1891 public static final int TEXT_DIRECTION_LTR = 3; 1892 1893 /** 1894 * Text direction is forced to RTL. 1895 * @hide 1896 */ 1897 public static final int TEXT_DIRECTION_RTL = 4; 1898 1899 /** 1900 * Text direction is coming from the system Locale. 1901 * @hide 1902 */ 1903 public static final int TEXT_DIRECTION_LOCALE = 5; 1904 1905 /** 1906 * Default text direction is inherited 1907 * @hide 1908 */ 1909 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1910 1911 /** 1912 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1913 * @hide 1914 */ 1915 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1916 1917 /** 1918 * Mask for use with private flags indicating bits used for text direction. 1919 * @hide 1920 */ 1921 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1922 1923 /** 1924 * Array of text direction flags for mapping attribute "textDirection" to correct 1925 * flag value. 1926 * @hide 1927 */ 1928 private static final int[] TEXT_DIRECTION_FLAGS = { 1929 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1930 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1931 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1932 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1933 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1934 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1935 }; 1936 1937 /** 1938 * Indicates whether the view text direction has been resolved. 1939 * @hide 1940 */ 1941 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1942 1943 /** 1944 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1945 * @hide 1946 */ 1947 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1948 1949 /** 1950 * Mask for use with private flags indicating bits used for resolved text direction. 1951 * @hide 1952 */ 1953 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1954 1955 /** 1956 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1957 * @hide 1958 */ 1959 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1960 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1961 1962 /* 1963 * Default text alignment. The text alignment of this View is inherited from its parent. 1964 * Use with {@link #setTextAlignment(int)} 1965 * @hide 1966 */ 1967 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1968 1969 /** 1970 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1971 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1972 * 1973 * Use with {@link #setTextAlignment(int)} 1974 * @hide 1975 */ 1976 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1977 1978 /** 1979 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1980 * 1981 * Use with {@link #setTextAlignment(int)} 1982 * @hide 1983 */ 1984 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1985 1986 /** 1987 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1988 * 1989 * Use with {@link #setTextAlignment(int)} 1990 * @hide 1991 */ 1992 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 1993 1994 /** 1995 * Center the paragraph, e.g. ALIGN_CENTER. 1996 * 1997 * Use with {@link #setTextAlignment(int)} 1998 * @hide 1999 */ 2000 public static final int TEXT_ALIGNMENT_CENTER = 4; 2001 2002 /** 2003 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 2004 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 2005 * 2006 * Use with {@link #setTextAlignment(int)} 2007 * @hide 2008 */ 2009 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 2010 2011 /** 2012 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2013 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2014 * 2015 * Use with {@link #setTextAlignment(int)} 2016 * @hide 2017 */ 2018 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2019 2020 /** 2021 * Default text alignment is inherited 2022 * @hide 2023 */ 2024 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2025 2026 /** 2027 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2028 * @hide 2029 */ 2030 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2031 2032 /** 2033 * Mask for use with private flags indicating bits used for text alignment. 2034 * @hide 2035 */ 2036 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2037 2038 /** 2039 * Array of text direction flags for mapping attribute "textAlignment" to correct 2040 * flag value. 2041 * @hide 2042 */ 2043 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2044 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2045 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2046 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2047 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2048 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2049 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2050 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2051 }; 2052 2053 /** 2054 * Indicates whether the view text alignment has been resolved. 2055 * @hide 2056 */ 2057 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2058 2059 /** 2060 * Bit shift to get the resolved text alignment. 2061 * @hide 2062 */ 2063 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2064 2065 /** 2066 * Mask for use with private flags indicating bits used for text alignment. 2067 * @hide 2068 */ 2069 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2070 2071 /** 2072 * Indicates whether if the view text alignment has been resolved to gravity 2073 */ 2074 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2075 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2076 2077 // Accessiblity constants for mPrivateFlags2 2078 2079 /** 2080 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2081 */ 2082 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2083 2084 /** 2085 * Automatically determine whether a view is important for accessibility. 2086 */ 2087 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2088 2089 /** 2090 * The view is important for accessibility. 2091 */ 2092 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2093 2094 /** 2095 * The view is not important for accessibility. 2096 */ 2097 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2098 2099 /** 2100 * The default whether the view is important for accessiblity. 2101 */ 2102 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2103 2104 /** 2105 * Mask for obtainig the bits which specify how to determine 2106 * whether a view is important for accessibility. 2107 */ 2108 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2109 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2110 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2111 2112 /** 2113 * Flag indicating whether a view has accessibility focus. 2114 */ 2115 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2116 2117 /** 2118 * Flag indicating whether a view state for accessibility has changed. 2119 */ 2120 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2121 2122 /* End of masks for mPrivateFlags2 */ 2123 2124 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2125 2126 /** 2127 * Always allow a user to over-scroll this view, provided it is a 2128 * view that can scroll. 2129 * 2130 * @see #getOverScrollMode() 2131 * @see #setOverScrollMode(int) 2132 */ 2133 public static final int OVER_SCROLL_ALWAYS = 0; 2134 2135 /** 2136 * Allow a user to over-scroll this view only if the content is large 2137 * enough to meaningfully scroll, provided it is a view that can scroll. 2138 * 2139 * @see #getOverScrollMode() 2140 * @see #setOverScrollMode(int) 2141 */ 2142 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2143 2144 /** 2145 * Never allow a user to over-scroll this view. 2146 * 2147 * @see #getOverScrollMode() 2148 * @see #setOverScrollMode(int) 2149 */ 2150 public static final int OVER_SCROLL_NEVER = 2; 2151 2152 /** 2153 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2154 * requested the system UI (status bar) to be visible (the default). 2155 * 2156 * @see #setSystemUiVisibility(int) 2157 */ 2158 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2159 2160 /** 2161 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2162 * system UI to enter an unobtrusive "low profile" mode. 2163 * 2164 * <p>This is for use in games, book readers, video players, or any other 2165 * "immersive" application where the usual system chrome is deemed too distracting. 2166 * 2167 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2168 * 2169 * @see #setSystemUiVisibility(int) 2170 */ 2171 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2172 2173 /** 2174 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2175 * system navigation be temporarily hidden. 2176 * 2177 * <p>This is an even less obtrusive state than that called for by 2178 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2179 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2180 * those to disappear. This is useful (in conjunction with the 2181 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2182 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2183 * window flags) for displaying content using every last pixel on the display. 2184 * 2185 * <p>There is a limitation: because navigation controls are so important, the least user 2186 * interaction will cause them to reappear immediately. When this happens, both 2187 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2188 * so that both elements reappear at the same time. 2189 * 2190 * @see #setSystemUiVisibility(int) 2191 */ 2192 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2193 2194 /** 2195 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2196 * into the normal fullscreen mode so that its content can take over the screen 2197 * while still allowing the user to interact with the application. 2198 * 2199 * <p>This has the same visual effect as 2200 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2201 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2202 * meaning that non-critical screen decorations (such as the status bar) will be 2203 * hidden while the user is in the View's window, focusing the experience on 2204 * that content. Unlike the window flag, if you are using ActionBar in 2205 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2206 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2207 * hide the action bar. 2208 * 2209 * <p>This approach to going fullscreen is best used over the window flag when 2210 * it is a transient state -- that is, the application does this at certain 2211 * points in its user interaction where it wants to allow the user to focus 2212 * on content, but not as a continuous state. For situations where the application 2213 * would like to simply stay full screen the entire time (such as a game that 2214 * wants to take over the screen), the 2215 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2216 * is usually a better approach. The state set here will be removed by the system 2217 * in various situations (such as the user moving to another application) like 2218 * the other system UI states. 2219 * 2220 * <p>When using this flag, the application should provide some easy facility 2221 * for the user to go out of it. A common example would be in an e-book 2222 * reader, where tapping on the screen brings back whatever screen and UI 2223 * decorations that had been hidden while the user was immersed in reading 2224 * the book. 2225 * 2226 * @see #setSystemUiVisibility(int) 2227 */ 2228 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2229 2230 /** 2231 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2232 * flags, we would like a stable view of the content insets given to 2233 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2234 * will always represent the worst case that the application can expect 2235 * as a continue state. In practice this means with any of system bar, 2236 * nav bar, and status bar shown, but not the space that would be needed 2237 * for an input method. 2238 * 2239 * <p>If you are using ActionBar in 2240 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2241 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2242 * insets it adds to those given to the application. 2243 */ 2244 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2245 2246 /** 2247 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2248 * to be layed out as if it has requested 2249 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2250 * allows it to avoid artifacts when switching in and out of that mode, at 2251 * the expense that some of its user interface may be covered by screen 2252 * decorations when they are shown. You can perform layout of your inner 2253 * UI elements to account for the navagation system UI through the 2254 * {@link #fitSystemWindows(Rect)} method. 2255 */ 2256 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2257 2258 /** 2259 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2260 * to be layed out as if it has requested 2261 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2262 * allows it to avoid artifacts when switching in and out of that mode, at 2263 * the expense that some of its user interface may be covered by screen 2264 * decorations when they are shown. You can perform layout of your inner 2265 * UI elements to account for non-fullscreen system UI through the 2266 * {@link #fitSystemWindows(Rect)} method. 2267 */ 2268 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2269 2270 /** 2271 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2272 */ 2273 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2274 2275 /** 2276 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2277 */ 2278 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2279 2280 /** 2281 * @hide 2282 * 2283 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2284 * out of the public fields to keep the undefined bits out of the developer's way. 2285 * 2286 * Flag to make the status bar not expandable. Unless you also 2287 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2288 */ 2289 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2290 2291 /** 2292 * @hide 2293 * 2294 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2295 * out of the public fields to keep the undefined bits out of the developer's way. 2296 * 2297 * Flag to hide notification icons and scrolling ticker text. 2298 */ 2299 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2300 2301 /** 2302 * @hide 2303 * 2304 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2305 * out of the public fields to keep the undefined bits out of the developer's way. 2306 * 2307 * Flag to disable incoming notification alerts. This will not block 2308 * icons, but it will block sound, vibrating and other visual or aural notifications. 2309 */ 2310 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2311 2312 /** 2313 * @hide 2314 * 2315 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2316 * out of the public fields to keep the undefined bits out of the developer's way. 2317 * 2318 * Flag to hide only the scrolling ticker. Note that 2319 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2320 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2321 */ 2322 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2323 2324 /** 2325 * @hide 2326 * 2327 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2328 * out of the public fields to keep the undefined bits out of the developer's way. 2329 * 2330 * Flag to hide the center system info area. 2331 */ 2332 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2333 2334 /** 2335 * @hide 2336 * 2337 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2338 * out of the public fields to keep the undefined bits out of the developer's way. 2339 * 2340 * Flag to hide only the home button. Don't use this 2341 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2342 */ 2343 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2344 2345 /** 2346 * @hide 2347 * 2348 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2349 * out of the public fields to keep the undefined bits out of the developer's way. 2350 * 2351 * Flag to hide only the back button. Don't use this 2352 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2353 */ 2354 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2355 2356 /** 2357 * @hide 2358 * 2359 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2360 * out of the public fields to keep the undefined bits out of the developer's way. 2361 * 2362 * Flag to hide only the clock. You might use this if your activity has 2363 * its own clock making the status bar's clock redundant. 2364 */ 2365 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2366 2367 /** 2368 * @hide 2369 * 2370 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2371 * out of the public fields to keep the undefined bits out of the developer's way. 2372 * 2373 * Flag to hide only the recent apps button. Don't use this 2374 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2375 */ 2376 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2377 2378 /** 2379 * @hide 2380 */ 2381 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2382 2383 /** 2384 * These are the system UI flags that can be cleared by events outside 2385 * of an application. Currently this is just the ability to tap on the 2386 * screen while hiding the navigation bar to have it return. 2387 * @hide 2388 */ 2389 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2390 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2391 | SYSTEM_UI_FLAG_FULLSCREEN; 2392 2393 /** 2394 * Flags that can impact the layout in relation to system UI. 2395 */ 2396 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2397 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2398 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2399 2400 /** 2401 * Find views that render the specified text. 2402 * 2403 * @see #findViewsWithText(ArrayList, CharSequence, int) 2404 */ 2405 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2406 2407 /** 2408 * Find find views that contain the specified content description. 2409 * 2410 * @see #findViewsWithText(ArrayList, CharSequence, int) 2411 */ 2412 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2413 2414 /** 2415 * Find views that contain {@link AccessibilityNodeProvider}. Such 2416 * a View is a root of virtual view hierarchy and may contain the searched 2417 * text. If this flag is set Views with providers are automatically 2418 * added and it is a responsibility of the client to call the APIs of 2419 * the provider to determine whether the virtual tree rooted at this View 2420 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2421 * represeting the virtual views with this text. 2422 * 2423 * @see #findViewsWithText(ArrayList, CharSequence, int) 2424 * 2425 * @hide 2426 */ 2427 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2428 2429 /** 2430 * Indicates that the screen has changed state and is now off. 2431 * 2432 * @see #onScreenStateChanged(int) 2433 */ 2434 public static final int SCREEN_STATE_OFF = 0x0; 2435 2436 /** 2437 * Indicates that the screen has changed state and is now on. 2438 * 2439 * @see #onScreenStateChanged(int) 2440 */ 2441 public static final int SCREEN_STATE_ON = 0x1; 2442 2443 /** 2444 * Controls the over-scroll mode for this view. 2445 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2446 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2447 * and {@link #OVER_SCROLL_NEVER}. 2448 */ 2449 private int mOverScrollMode; 2450 2451 /** 2452 * The parent this view is attached to. 2453 * {@hide} 2454 * 2455 * @see #getParent() 2456 */ 2457 protected ViewParent mParent; 2458 2459 /** 2460 * {@hide} 2461 */ 2462 AttachInfo mAttachInfo; 2463 2464 /** 2465 * {@hide} 2466 */ 2467 @ViewDebug.ExportedProperty(flagMapping = { 2468 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2469 name = "FORCE_LAYOUT"), 2470 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2471 name = "LAYOUT_REQUIRED"), 2472 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2473 name = "DRAWING_CACHE_INVALID", outputIf = false), 2474 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2475 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2476 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2477 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2478 }) 2479 int mPrivateFlags; 2480 int mPrivateFlags2; 2481 2482 /** 2483 * This view's request for the visibility of the status bar. 2484 * @hide 2485 */ 2486 @ViewDebug.ExportedProperty(flagMapping = { 2487 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2488 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2489 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2490 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2491 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2492 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2493 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2494 equals = SYSTEM_UI_FLAG_VISIBLE, 2495 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2496 }) 2497 int mSystemUiVisibility; 2498 2499 /** 2500 * Reference count for transient state. 2501 * @see #setHasTransientState(boolean) 2502 */ 2503 int mTransientStateCount = 0; 2504 2505 /** 2506 * Count of how many windows this view has been attached to. 2507 */ 2508 int mWindowAttachCount; 2509 2510 /** 2511 * The layout parameters associated with this view and used by the parent 2512 * {@link android.view.ViewGroup} to determine how this view should be 2513 * laid out. 2514 * {@hide} 2515 */ 2516 protected ViewGroup.LayoutParams mLayoutParams; 2517 2518 /** 2519 * The view flags hold various views states. 2520 * {@hide} 2521 */ 2522 @ViewDebug.ExportedProperty 2523 int mViewFlags; 2524 2525 static class TransformationInfo { 2526 /** 2527 * The transform matrix for the View. This transform is calculated internally 2528 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2529 * is used by default. Do *not* use this variable directly; instead call 2530 * getMatrix(), which will automatically recalculate the matrix if necessary 2531 * to get the correct matrix based on the latest rotation and scale properties. 2532 */ 2533 private final Matrix mMatrix = new Matrix(); 2534 2535 /** 2536 * The transform matrix for the View. This transform is calculated internally 2537 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2538 * is used by default. Do *not* use this variable directly; instead call 2539 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2540 * to get the correct matrix based on the latest rotation and scale properties. 2541 */ 2542 private Matrix mInverseMatrix; 2543 2544 /** 2545 * An internal variable that tracks whether we need to recalculate the 2546 * transform matrix, based on whether the rotation or scaleX/Y properties 2547 * have changed since the matrix was last calculated. 2548 */ 2549 boolean mMatrixDirty = false; 2550 2551 /** 2552 * An internal variable that tracks whether we need to recalculate the 2553 * transform matrix, based on whether the rotation or scaleX/Y properties 2554 * have changed since the matrix was last calculated. 2555 */ 2556 private boolean mInverseMatrixDirty = true; 2557 2558 /** 2559 * A variable that tracks whether we need to recalculate the 2560 * transform matrix, based on whether the rotation or scaleX/Y properties 2561 * have changed since the matrix was last calculated. This variable 2562 * is only valid after a call to updateMatrix() or to a function that 2563 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2564 */ 2565 private boolean mMatrixIsIdentity = true; 2566 2567 /** 2568 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2569 */ 2570 private Camera mCamera = null; 2571 2572 /** 2573 * This matrix is used when computing the matrix for 3D rotations. 2574 */ 2575 private Matrix matrix3D = null; 2576 2577 /** 2578 * These prev values are used to recalculate a centered pivot point when necessary. The 2579 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2580 * set), so thes values are only used then as well. 2581 */ 2582 private int mPrevWidth = -1; 2583 private int mPrevHeight = -1; 2584 2585 /** 2586 * The degrees rotation around the vertical axis through the pivot point. 2587 */ 2588 @ViewDebug.ExportedProperty 2589 float mRotationY = 0f; 2590 2591 /** 2592 * The degrees rotation around the horizontal axis through the pivot point. 2593 */ 2594 @ViewDebug.ExportedProperty 2595 float mRotationX = 0f; 2596 2597 /** 2598 * The degrees rotation around the pivot point. 2599 */ 2600 @ViewDebug.ExportedProperty 2601 float mRotation = 0f; 2602 2603 /** 2604 * The amount of translation of the object away from its left property (post-layout). 2605 */ 2606 @ViewDebug.ExportedProperty 2607 float mTranslationX = 0f; 2608 2609 /** 2610 * The amount of translation of the object away from its top property (post-layout). 2611 */ 2612 @ViewDebug.ExportedProperty 2613 float mTranslationY = 0f; 2614 2615 /** 2616 * The amount of scale in the x direction around the pivot point. A 2617 * value of 1 means no scaling is applied. 2618 */ 2619 @ViewDebug.ExportedProperty 2620 float mScaleX = 1f; 2621 2622 /** 2623 * The amount of scale in the y direction around the pivot point. A 2624 * value of 1 means no scaling is applied. 2625 */ 2626 @ViewDebug.ExportedProperty 2627 float mScaleY = 1f; 2628 2629 /** 2630 * The x location of the point around which the view is rotated and scaled. 2631 */ 2632 @ViewDebug.ExportedProperty 2633 float mPivotX = 0f; 2634 2635 /** 2636 * The y location of the point around which the view is rotated and scaled. 2637 */ 2638 @ViewDebug.ExportedProperty 2639 float mPivotY = 0f; 2640 2641 /** 2642 * The opacity of the View. This is a value from 0 to 1, where 0 means 2643 * completely transparent and 1 means completely opaque. 2644 */ 2645 @ViewDebug.ExportedProperty 2646 float mAlpha = 1f; 2647 } 2648 2649 TransformationInfo mTransformationInfo; 2650 2651 private boolean mLastIsOpaque; 2652 2653 /** 2654 * Convenience value to check for float values that are close enough to zero to be considered 2655 * zero. 2656 */ 2657 private static final float NONZERO_EPSILON = .001f; 2658 2659 /** 2660 * The distance in pixels from the left edge of this view's parent 2661 * to the left edge of this view. 2662 * {@hide} 2663 */ 2664 @ViewDebug.ExportedProperty(category = "layout") 2665 protected int mLeft; 2666 /** 2667 * The distance in pixels from the left edge of this view's parent 2668 * to the right edge of this view. 2669 * {@hide} 2670 */ 2671 @ViewDebug.ExportedProperty(category = "layout") 2672 protected int mRight; 2673 /** 2674 * The distance in pixels from the top edge of this view's parent 2675 * to the top edge of this view. 2676 * {@hide} 2677 */ 2678 @ViewDebug.ExportedProperty(category = "layout") 2679 protected int mTop; 2680 /** 2681 * The distance in pixels from the top edge of this view's parent 2682 * to the bottom edge of this view. 2683 * {@hide} 2684 */ 2685 @ViewDebug.ExportedProperty(category = "layout") 2686 protected int mBottom; 2687 2688 /** 2689 * The offset, in pixels, by which the content of this view is scrolled 2690 * horizontally. 2691 * {@hide} 2692 */ 2693 @ViewDebug.ExportedProperty(category = "scrolling") 2694 protected int mScrollX; 2695 /** 2696 * The offset, in pixels, by which the content of this view is scrolled 2697 * vertically. 2698 * {@hide} 2699 */ 2700 @ViewDebug.ExportedProperty(category = "scrolling") 2701 protected int mScrollY; 2702 2703 /** 2704 * The left padding in pixels, that is the distance in pixels between the 2705 * left edge of this view and the left edge of its content. 2706 * {@hide} 2707 */ 2708 @ViewDebug.ExportedProperty(category = "padding") 2709 protected int mPaddingLeft; 2710 /** 2711 * The right padding in pixels, that is the distance in pixels between the 2712 * right edge of this view and the right edge of its content. 2713 * {@hide} 2714 */ 2715 @ViewDebug.ExportedProperty(category = "padding") 2716 protected int mPaddingRight; 2717 /** 2718 * The top padding in pixels, that is the distance in pixels between the 2719 * top edge of this view and the top edge of its content. 2720 * {@hide} 2721 */ 2722 @ViewDebug.ExportedProperty(category = "padding") 2723 protected int mPaddingTop; 2724 /** 2725 * The bottom padding in pixels, that is the distance in pixels between the 2726 * bottom edge of this view and the bottom edge of its content. 2727 * {@hide} 2728 */ 2729 @ViewDebug.ExportedProperty(category = "padding") 2730 protected int mPaddingBottom; 2731 2732 /** 2733 * The layout insets in pixels, that is the distance in pixels between the 2734 * visible edges of this view its bounds. 2735 */ 2736 private Insets mLayoutInsets; 2737 2738 /** 2739 * Briefly describes the view and is primarily used for accessibility support. 2740 */ 2741 private CharSequence mContentDescription; 2742 2743 /** 2744 * Cache the paddingRight set by the user to append to the scrollbar's size. 2745 * 2746 * @hide 2747 */ 2748 @ViewDebug.ExportedProperty(category = "padding") 2749 protected int mUserPaddingRight; 2750 2751 /** 2752 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2753 * 2754 * @hide 2755 */ 2756 @ViewDebug.ExportedProperty(category = "padding") 2757 protected int mUserPaddingBottom; 2758 2759 /** 2760 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2761 * 2762 * @hide 2763 */ 2764 @ViewDebug.ExportedProperty(category = "padding") 2765 protected int mUserPaddingLeft; 2766 2767 /** 2768 * Cache if the user padding is relative. 2769 * 2770 */ 2771 @ViewDebug.ExportedProperty(category = "padding") 2772 boolean mUserPaddingRelative; 2773 2774 /** 2775 * Cache the paddingStart set by the user to append to the scrollbar's size. 2776 * 2777 */ 2778 @ViewDebug.ExportedProperty(category = "padding") 2779 int mUserPaddingStart; 2780 2781 /** 2782 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2783 * 2784 */ 2785 @ViewDebug.ExportedProperty(category = "padding") 2786 int mUserPaddingEnd; 2787 2788 /** 2789 * @hide 2790 */ 2791 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2792 /** 2793 * @hide 2794 */ 2795 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2796 2797 private Drawable mBackground; 2798 2799 private int mBackgroundResource; 2800 private boolean mBackgroundSizeChanged; 2801 2802 static class ListenerInfo { 2803 /** 2804 * Listener used to dispatch focus change events. 2805 * This field should be made private, so it is hidden from the SDK. 2806 * {@hide} 2807 */ 2808 protected OnFocusChangeListener mOnFocusChangeListener; 2809 2810 /** 2811 * Listeners for layout change events. 2812 */ 2813 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2814 2815 /** 2816 * Listeners for attach events. 2817 */ 2818 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2819 2820 /** 2821 * Listener used to dispatch click events. 2822 * This field should be made private, so it is hidden from the SDK. 2823 * {@hide} 2824 */ 2825 public OnClickListener mOnClickListener; 2826 2827 /** 2828 * Listener used to dispatch long click events. 2829 * This field should be made private, so it is hidden from the SDK. 2830 * {@hide} 2831 */ 2832 protected OnLongClickListener mOnLongClickListener; 2833 2834 /** 2835 * Listener used to build the context menu. 2836 * This field should be made private, so it is hidden from the SDK. 2837 * {@hide} 2838 */ 2839 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2840 2841 private OnKeyListener mOnKeyListener; 2842 2843 private OnTouchListener mOnTouchListener; 2844 2845 private OnHoverListener mOnHoverListener; 2846 2847 private OnGenericMotionListener mOnGenericMotionListener; 2848 2849 private OnDragListener mOnDragListener; 2850 2851 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2852 } 2853 2854 ListenerInfo mListenerInfo; 2855 2856 /** 2857 * The application environment this view lives in. 2858 * This field should be made private, so it is hidden from the SDK. 2859 * {@hide} 2860 */ 2861 protected Context mContext; 2862 2863 private final Resources mResources; 2864 2865 private ScrollabilityCache mScrollCache; 2866 2867 private int[] mDrawableState = null; 2868 2869 /** 2870 * Set to true when drawing cache is enabled and cannot be created. 2871 * 2872 * @hide 2873 */ 2874 public boolean mCachingFailed; 2875 2876 private Bitmap mDrawingCache; 2877 private Bitmap mUnscaledDrawingCache; 2878 private HardwareLayer mHardwareLayer; 2879 DisplayList mDisplayList; 2880 2881 /** 2882 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2883 * the user may specify which view to go to next. 2884 */ 2885 private int mNextFocusLeftId = View.NO_ID; 2886 2887 /** 2888 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2889 * the user may specify which view to go to next. 2890 */ 2891 private int mNextFocusRightId = View.NO_ID; 2892 2893 /** 2894 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2895 * the user may specify which view to go to next. 2896 */ 2897 private int mNextFocusUpId = View.NO_ID; 2898 2899 /** 2900 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2901 * the user may specify which view to go to next. 2902 */ 2903 private int mNextFocusDownId = View.NO_ID; 2904 2905 /** 2906 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2907 * the user may specify which view to go to next. 2908 */ 2909 int mNextFocusForwardId = View.NO_ID; 2910 2911 private CheckForLongPress mPendingCheckForLongPress; 2912 private CheckForTap mPendingCheckForTap = null; 2913 private PerformClick mPerformClick; 2914 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2915 2916 private UnsetPressedState mUnsetPressedState; 2917 2918 /** 2919 * Whether the long press's action has been invoked. The tap's action is invoked on the 2920 * up event while a long press is invoked as soon as the long press duration is reached, so 2921 * a long press could be performed before the tap is checked, in which case the tap's action 2922 * should not be invoked. 2923 */ 2924 private boolean mHasPerformedLongPress; 2925 2926 /** 2927 * The minimum height of the view. We'll try our best to have the height 2928 * of this view to at least this amount. 2929 */ 2930 @ViewDebug.ExportedProperty(category = "measurement") 2931 private int mMinHeight; 2932 2933 /** 2934 * The minimum width of the view. We'll try our best to have the width 2935 * of this view to at least this amount. 2936 */ 2937 @ViewDebug.ExportedProperty(category = "measurement") 2938 private int mMinWidth; 2939 2940 /** 2941 * The delegate to handle touch events that are physically in this view 2942 * but should be handled by another view. 2943 */ 2944 private TouchDelegate mTouchDelegate = null; 2945 2946 /** 2947 * Solid color to use as a background when creating the drawing cache. Enables 2948 * the cache to use 16 bit bitmaps instead of 32 bit. 2949 */ 2950 private int mDrawingCacheBackgroundColor = 0; 2951 2952 /** 2953 * Special tree observer used when mAttachInfo is null. 2954 */ 2955 private ViewTreeObserver mFloatingTreeObserver; 2956 2957 /** 2958 * Cache the touch slop from the context that created the view. 2959 */ 2960 private int mTouchSlop; 2961 2962 /** 2963 * Object that handles automatic animation of view properties. 2964 */ 2965 private ViewPropertyAnimator mAnimator = null; 2966 2967 /** 2968 * Flag indicating that a drag can cross window boundaries. When 2969 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2970 * with this flag set, all visible applications will be able to participate 2971 * in the drag operation and receive the dragged content. 2972 * 2973 * @hide 2974 */ 2975 public static final int DRAG_FLAG_GLOBAL = 1; 2976 2977 /** 2978 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2979 */ 2980 private float mVerticalScrollFactor; 2981 2982 /** 2983 * Position of the vertical scroll bar. 2984 */ 2985 private int mVerticalScrollbarPosition; 2986 2987 /** 2988 * Position the scroll bar at the default position as determined by the system. 2989 */ 2990 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2991 2992 /** 2993 * Position the scroll bar along the left edge. 2994 */ 2995 public static final int SCROLLBAR_POSITION_LEFT = 1; 2996 2997 /** 2998 * Position the scroll bar along the right edge. 2999 */ 3000 public static final int SCROLLBAR_POSITION_RIGHT = 2; 3001 3002 /** 3003 * Indicates that the view does not have a layer. 3004 * 3005 * @see #getLayerType() 3006 * @see #setLayerType(int, android.graphics.Paint) 3007 * @see #LAYER_TYPE_SOFTWARE 3008 * @see #LAYER_TYPE_HARDWARE 3009 */ 3010 public static final int LAYER_TYPE_NONE = 0; 3011 3012 /** 3013 * <p>Indicates that the view has a software layer. A software layer is backed 3014 * by a bitmap and causes the view to be rendered using Android's software 3015 * rendering pipeline, even if hardware acceleration is enabled.</p> 3016 * 3017 * <p>Software layers have various usages:</p> 3018 * <p>When the application is not using hardware acceleration, a software layer 3019 * is useful to apply a specific color filter and/or blending mode and/or 3020 * translucency to a view and all its children.</p> 3021 * <p>When the application is using hardware acceleration, a software layer 3022 * is useful to render drawing primitives not supported by the hardware 3023 * accelerated pipeline. It can also be used to cache a complex view tree 3024 * into a texture and reduce the complexity of drawing operations. For instance, 3025 * when animating a complex view tree with a translation, a software layer can 3026 * be used to render the view tree only once.</p> 3027 * <p>Software layers should be avoided when the affected view tree updates 3028 * often. Every update will require to re-render the software layer, which can 3029 * potentially be slow (particularly when hardware acceleration is turned on 3030 * since the layer will have to be uploaded into a hardware texture after every 3031 * update.)</p> 3032 * 3033 * @see #getLayerType() 3034 * @see #setLayerType(int, android.graphics.Paint) 3035 * @see #LAYER_TYPE_NONE 3036 * @see #LAYER_TYPE_HARDWARE 3037 */ 3038 public static final int LAYER_TYPE_SOFTWARE = 1; 3039 3040 /** 3041 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3042 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3043 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3044 * rendering pipeline, but only if hardware acceleration is turned on for the 3045 * view hierarchy. When hardware acceleration is turned off, hardware layers 3046 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3047 * 3048 * <p>A hardware layer is useful to apply a specific color filter and/or 3049 * blending mode and/or translucency to a view and all its children.</p> 3050 * <p>A hardware layer can be used to cache a complex view tree into a 3051 * texture and reduce the complexity of drawing operations. For instance, 3052 * when animating a complex view tree with a translation, a hardware layer can 3053 * be used to render the view tree only once.</p> 3054 * <p>A hardware layer can also be used to increase the rendering quality when 3055 * rotation transformations are applied on a view. It can also be used to 3056 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3057 * 3058 * @see #getLayerType() 3059 * @see #setLayerType(int, android.graphics.Paint) 3060 * @see #LAYER_TYPE_NONE 3061 * @see #LAYER_TYPE_SOFTWARE 3062 */ 3063 public static final int LAYER_TYPE_HARDWARE = 2; 3064 3065 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3066 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3067 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3068 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3069 }) 3070 int mLayerType = LAYER_TYPE_NONE; 3071 Paint mLayerPaint; 3072 Rect mLocalDirtyRect; 3073 3074 /** 3075 * Set to true when the view is sending hover accessibility events because it 3076 * is the innermost hovered view. 3077 */ 3078 private boolean mSendingHoverAccessibilityEvents; 3079 3080 /** 3081 * Simple constructor to use when creating a view from code. 3082 * 3083 * @param context The Context the view is running in, through which it can 3084 * access the current theme, resources, etc. 3085 */ 3086 public View(Context context) { 3087 mContext = context; 3088 mResources = context != null ? context.getResources() : null; 3089 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3090 // Set layout and text direction defaults 3091 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3092 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3093 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3094 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3095 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3096 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3097 mUserPaddingStart = -1; 3098 mUserPaddingEnd = -1; 3099 mUserPaddingRelative = false; 3100 } 3101 3102 /** 3103 * Delegate for injecting accessiblity functionality. 3104 */ 3105 AccessibilityDelegate mAccessibilityDelegate; 3106 3107 /** 3108 * Consistency verifier for debugging purposes. 3109 * @hide 3110 */ 3111 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3112 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3113 new InputEventConsistencyVerifier(this, 0) : null; 3114 3115 /** 3116 * Constructor that is called when inflating a view from XML. This is called 3117 * when a view is being constructed from an XML file, supplying attributes 3118 * that were specified in the XML file. This version uses a default style of 3119 * 0, so the only attribute values applied are those in the Context's Theme 3120 * and the given AttributeSet. 3121 * 3122 * <p> 3123 * The method onFinishInflate() will be called after all children have been 3124 * added. 3125 * 3126 * @param context The Context the view is running in, through which it can 3127 * access the current theme, resources, etc. 3128 * @param attrs The attributes of the XML tag that is inflating the view. 3129 * @see #View(Context, AttributeSet, int) 3130 */ 3131 public View(Context context, AttributeSet attrs) { 3132 this(context, attrs, 0); 3133 } 3134 3135 /** 3136 * Perform inflation from XML and apply a class-specific base style. This 3137 * constructor of View allows subclasses to use their own base style when 3138 * they are inflating. For example, a Button class's constructor would call 3139 * this version of the super class constructor and supply 3140 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3141 * the theme's button style to modify all of the base view attributes (in 3142 * particular its background) as well as the Button class's attributes. 3143 * 3144 * @param context The Context the view is running in, through which it can 3145 * access the current theme, resources, etc. 3146 * @param attrs The attributes of the XML tag that is inflating the view. 3147 * @param defStyle The default style to apply to this view. If 0, no style 3148 * will be applied (beyond what is included in the theme). This may 3149 * either be an attribute resource, whose value will be retrieved 3150 * from the current theme, or an explicit style resource. 3151 * @see #View(Context, AttributeSet) 3152 */ 3153 public View(Context context, AttributeSet attrs, int defStyle) { 3154 this(context); 3155 3156 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3157 defStyle, 0); 3158 3159 Drawable background = null; 3160 3161 int leftPadding = -1; 3162 int topPadding = -1; 3163 int rightPadding = -1; 3164 int bottomPadding = -1; 3165 int startPadding = -1; 3166 int endPadding = -1; 3167 3168 int padding = -1; 3169 3170 int viewFlagValues = 0; 3171 int viewFlagMasks = 0; 3172 3173 boolean setScrollContainer = false; 3174 3175 int x = 0; 3176 int y = 0; 3177 3178 float tx = 0; 3179 float ty = 0; 3180 float rotation = 0; 3181 float rotationX = 0; 3182 float rotationY = 0; 3183 float sx = 1f; 3184 float sy = 1f; 3185 boolean transformSet = false; 3186 3187 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3188 3189 int overScrollMode = mOverScrollMode; 3190 final int N = a.getIndexCount(); 3191 for (int i = 0; i < N; i++) { 3192 int attr = a.getIndex(i); 3193 switch (attr) { 3194 case com.android.internal.R.styleable.View_background: 3195 background = a.getDrawable(attr); 3196 break; 3197 case com.android.internal.R.styleable.View_padding: 3198 padding = a.getDimensionPixelSize(attr, -1); 3199 break; 3200 case com.android.internal.R.styleable.View_paddingLeft: 3201 leftPadding = a.getDimensionPixelSize(attr, -1); 3202 break; 3203 case com.android.internal.R.styleable.View_paddingTop: 3204 topPadding = a.getDimensionPixelSize(attr, -1); 3205 break; 3206 case com.android.internal.R.styleable.View_paddingRight: 3207 rightPadding = a.getDimensionPixelSize(attr, -1); 3208 break; 3209 case com.android.internal.R.styleable.View_paddingBottom: 3210 bottomPadding = a.getDimensionPixelSize(attr, -1); 3211 break; 3212 case com.android.internal.R.styleable.View_paddingStart: 3213 startPadding = a.getDimensionPixelSize(attr, -1); 3214 break; 3215 case com.android.internal.R.styleable.View_paddingEnd: 3216 endPadding = a.getDimensionPixelSize(attr, -1); 3217 break; 3218 case com.android.internal.R.styleable.View_scrollX: 3219 x = a.getDimensionPixelOffset(attr, 0); 3220 break; 3221 case com.android.internal.R.styleable.View_scrollY: 3222 y = a.getDimensionPixelOffset(attr, 0); 3223 break; 3224 case com.android.internal.R.styleable.View_alpha: 3225 setAlpha(a.getFloat(attr, 1f)); 3226 break; 3227 case com.android.internal.R.styleable.View_transformPivotX: 3228 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3229 break; 3230 case com.android.internal.R.styleable.View_transformPivotY: 3231 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3232 break; 3233 case com.android.internal.R.styleable.View_translationX: 3234 tx = a.getDimensionPixelOffset(attr, 0); 3235 transformSet = true; 3236 break; 3237 case com.android.internal.R.styleable.View_translationY: 3238 ty = a.getDimensionPixelOffset(attr, 0); 3239 transformSet = true; 3240 break; 3241 case com.android.internal.R.styleable.View_rotation: 3242 rotation = a.getFloat(attr, 0); 3243 transformSet = true; 3244 break; 3245 case com.android.internal.R.styleable.View_rotationX: 3246 rotationX = a.getFloat(attr, 0); 3247 transformSet = true; 3248 break; 3249 case com.android.internal.R.styleable.View_rotationY: 3250 rotationY = a.getFloat(attr, 0); 3251 transformSet = true; 3252 break; 3253 case com.android.internal.R.styleable.View_scaleX: 3254 sx = a.getFloat(attr, 1f); 3255 transformSet = true; 3256 break; 3257 case com.android.internal.R.styleable.View_scaleY: 3258 sy = a.getFloat(attr, 1f); 3259 transformSet = true; 3260 break; 3261 case com.android.internal.R.styleable.View_id: 3262 mID = a.getResourceId(attr, NO_ID); 3263 break; 3264 case com.android.internal.R.styleable.View_tag: 3265 mTag = a.getText(attr); 3266 break; 3267 case com.android.internal.R.styleable.View_fitsSystemWindows: 3268 if (a.getBoolean(attr, false)) { 3269 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3270 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3271 } 3272 break; 3273 case com.android.internal.R.styleable.View_focusable: 3274 if (a.getBoolean(attr, false)) { 3275 viewFlagValues |= FOCUSABLE; 3276 viewFlagMasks |= FOCUSABLE_MASK; 3277 } 3278 break; 3279 case com.android.internal.R.styleable.View_focusableInTouchMode: 3280 if (a.getBoolean(attr, false)) { 3281 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3282 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3283 } 3284 break; 3285 case com.android.internal.R.styleable.View_clickable: 3286 if (a.getBoolean(attr, false)) { 3287 viewFlagValues |= CLICKABLE; 3288 viewFlagMasks |= CLICKABLE; 3289 } 3290 break; 3291 case com.android.internal.R.styleable.View_longClickable: 3292 if (a.getBoolean(attr, false)) { 3293 viewFlagValues |= LONG_CLICKABLE; 3294 viewFlagMasks |= LONG_CLICKABLE; 3295 } 3296 break; 3297 case com.android.internal.R.styleable.View_saveEnabled: 3298 if (!a.getBoolean(attr, true)) { 3299 viewFlagValues |= SAVE_DISABLED; 3300 viewFlagMasks |= SAVE_DISABLED_MASK; 3301 } 3302 break; 3303 case com.android.internal.R.styleable.View_duplicateParentState: 3304 if (a.getBoolean(attr, false)) { 3305 viewFlagValues |= DUPLICATE_PARENT_STATE; 3306 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3307 } 3308 break; 3309 case com.android.internal.R.styleable.View_visibility: 3310 final int visibility = a.getInt(attr, 0); 3311 if (visibility != 0) { 3312 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3313 viewFlagMasks |= VISIBILITY_MASK; 3314 } 3315 break; 3316 case com.android.internal.R.styleable.View_layoutDirection: 3317 // Clear any layout direction flags (included resolved bits) already set 3318 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3319 // Set the layout direction flags depending on the value of the attribute 3320 final int layoutDirection = a.getInt(attr, -1); 3321 final int value = (layoutDirection != -1) ? 3322 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3323 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3324 break; 3325 case com.android.internal.R.styleable.View_drawingCacheQuality: 3326 final int cacheQuality = a.getInt(attr, 0); 3327 if (cacheQuality != 0) { 3328 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3329 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3330 } 3331 break; 3332 case com.android.internal.R.styleable.View_contentDescription: 3333 mContentDescription = a.getString(attr); 3334 break; 3335 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3336 if (!a.getBoolean(attr, true)) { 3337 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3338 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3339 } 3340 break; 3341 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3342 if (!a.getBoolean(attr, true)) { 3343 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3344 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3345 } 3346 break; 3347 case R.styleable.View_scrollbars: 3348 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3349 if (scrollbars != SCROLLBARS_NONE) { 3350 viewFlagValues |= scrollbars; 3351 viewFlagMasks |= SCROLLBARS_MASK; 3352 initializeScrollbars(a); 3353 } 3354 break; 3355 //noinspection deprecation 3356 case R.styleable.View_fadingEdge: 3357 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3358 // Ignore the attribute starting with ICS 3359 break; 3360 } 3361 // With builds < ICS, fall through and apply fading edges 3362 case R.styleable.View_requiresFadingEdge: 3363 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3364 if (fadingEdge != FADING_EDGE_NONE) { 3365 viewFlagValues |= fadingEdge; 3366 viewFlagMasks |= FADING_EDGE_MASK; 3367 initializeFadingEdge(a); 3368 } 3369 break; 3370 case R.styleable.View_scrollbarStyle: 3371 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3372 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3373 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3374 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3375 } 3376 break; 3377 case R.styleable.View_isScrollContainer: 3378 setScrollContainer = true; 3379 if (a.getBoolean(attr, false)) { 3380 setScrollContainer(true); 3381 } 3382 break; 3383 case com.android.internal.R.styleable.View_keepScreenOn: 3384 if (a.getBoolean(attr, false)) { 3385 viewFlagValues |= KEEP_SCREEN_ON; 3386 viewFlagMasks |= KEEP_SCREEN_ON; 3387 } 3388 break; 3389 case R.styleable.View_filterTouchesWhenObscured: 3390 if (a.getBoolean(attr, false)) { 3391 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3392 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3393 } 3394 break; 3395 case R.styleable.View_nextFocusLeft: 3396 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3397 break; 3398 case R.styleable.View_nextFocusRight: 3399 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3400 break; 3401 case R.styleable.View_nextFocusUp: 3402 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3403 break; 3404 case R.styleable.View_nextFocusDown: 3405 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3406 break; 3407 case R.styleable.View_nextFocusForward: 3408 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3409 break; 3410 case R.styleable.View_minWidth: 3411 mMinWidth = a.getDimensionPixelSize(attr, 0); 3412 break; 3413 case R.styleable.View_minHeight: 3414 mMinHeight = a.getDimensionPixelSize(attr, 0); 3415 break; 3416 case R.styleable.View_onClick: 3417 if (context.isRestricted()) { 3418 throw new IllegalStateException("The android:onClick attribute cannot " 3419 + "be used within a restricted context"); 3420 } 3421 3422 final String handlerName = a.getString(attr); 3423 if (handlerName != null) { 3424 setOnClickListener(new OnClickListener() { 3425 private Method mHandler; 3426 3427 public void onClick(View v) { 3428 if (mHandler == null) { 3429 try { 3430 mHandler = getContext().getClass().getMethod(handlerName, 3431 View.class); 3432 } catch (NoSuchMethodException e) { 3433 int id = getId(); 3434 String idText = id == NO_ID ? "" : " with id '" 3435 + getContext().getResources().getResourceEntryName( 3436 id) + "'"; 3437 throw new IllegalStateException("Could not find a method " + 3438 handlerName + "(View) in the activity " 3439 + getContext().getClass() + " for onClick handler" 3440 + " on view " + View.this.getClass() + idText, e); 3441 } 3442 } 3443 3444 try { 3445 mHandler.invoke(getContext(), View.this); 3446 } catch (IllegalAccessException e) { 3447 throw new IllegalStateException("Could not execute non " 3448 + "public method of the activity", e); 3449 } catch (InvocationTargetException e) { 3450 throw new IllegalStateException("Could not execute " 3451 + "method of the activity", e); 3452 } 3453 } 3454 }); 3455 } 3456 break; 3457 case R.styleable.View_overScrollMode: 3458 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3459 break; 3460 case R.styleable.View_verticalScrollbarPosition: 3461 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3462 break; 3463 case R.styleable.View_layerType: 3464 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3465 break; 3466 case R.styleable.View_textDirection: 3467 // Clear any text direction flag already set 3468 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3469 // Set the text direction flags depending on the value of the attribute 3470 final int textDirection = a.getInt(attr, -1); 3471 if (textDirection != -1) { 3472 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3473 } 3474 break; 3475 case R.styleable.View_textAlignment: 3476 // Clear any text alignment flag already set 3477 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3478 // Set the text alignment flag depending on the value of the attribute 3479 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3480 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3481 break; 3482 case R.styleable.View_importantForAccessibility: 3483 setImportantForAccessibility(a.getInt(attr, 3484 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3485 } 3486 } 3487 3488 a.recycle(); 3489 3490 setOverScrollMode(overScrollMode); 3491 3492 if (background != null) { 3493 setBackground(background); 3494 } 3495 3496 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3497 // layout direction). Those cached values will be used later during padding resolution. 3498 mUserPaddingStart = startPadding; 3499 mUserPaddingEnd = endPadding; 3500 3501 updateUserPaddingRelative(); 3502 3503 if (padding >= 0) { 3504 leftPadding = padding; 3505 topPadding = padding; 3506 rightPadding = padding; 3507 bottomPadding = padding; 3508 } 3509 3510 // If the user specified the padding (either with android:padding or 3511 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3512 // use the default padding or the padding from the background drawable 3513 // (stored at this point in mPadding*) 3514 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3515 topPadding >= 0 ? topPadding : mPaddingTop, 3516 rightPadding >= 0 ? rightPadding : mPaddingRight, 3517 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3518 3519 if (viewFlagMasks != 0) { 3520 setFlags(viewFlagValues, viewFlagMasks); 3521 } 3522 3523 // Needs to be called after mViewFlags is set 3524 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3525 recomputePadding(); 3526 } 3527 3528 if (x != 0 || y != 0) { 3529 scrollTo(x, y); 3530 } 3531 3532 if (transformSet) { 3533 setTranslationX(tx); 3534 setTranslationY(ty); 3535 setRotation(rotation); 3536 setRotationX(rotationX); 3537 setRotationY(rotationY); 3538 setScaleX(sx); 3539 setScaleY(sy); 3540 } 3541 3542 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3543 setScrollContainer(true); 3544 } 3545 3546 computeOpaqueFlags(); 3547 } 3548 3549 private void updateUserPaddingRelative() { 3550 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3551 } 3552 3553 /** 3554 * Non-public constructor for use in testing 3555 */ 3556 View() { 3557 mResources = null; 3558 } 3559 3560 /** 3561 * <p> 3562 * Initializes the fading edges from a given set of styled attributes. This 3563 * method should be called by subclasses that need fading edges and when an 3564 * instance of these subclasses is created programmatically rather than 3565 * being inflated from XML. This method is automatically called when the XML 3566 * is inflated. 3567 * </p> 3568 * 3569 * @param a the styled attributes set to initialize the fading edges from 3570 */ 3571 protected void initializeFadingEdge(TypedArray a) { 3572 initScrollCache(); 3573 3574 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3575 R.styleable.View_fadingEdgeLength, 3576 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3577 } 3578 3579 /** 3580 * Returns the size of the vertical faded edges used to indicate that more 3581 * content in this view is visible. 3582 * 3583 * @return The size in pixels of the vertical faded edge or 0 if vertical 3584 * faded edges are not enabled for this view. 3585 * @attr ref android.R.styleable#View_fadingEdgeLength 3586 */ 3587 public int getVerticalFadingEdgeLength() { 3588 if (isVerticalFadingEdgeEnabled()) { 3589 ScrollabilityCache cache = mScrollCache; 3590 if (cache != null) { 3591 return cache.fadingEdgeLength; 3592 } 3593 } 3594 return 0; 3595 } 3596 3597 /** 3598 * Set the size of the faded edge used to indicate that more content in this 3599 * view is available. Will not change whether the fading edge is enabled; use 3600 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3601 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3602 * for the vertical or horizontal fading edges. 3603 * 3604 * @param length The size in pixels of the faded edge used to indicate that more 3605 * content in this view is visible. 3606 */ 3607 public void setFadingEdgeLength(int length) { 3608 initScrollCache(); 3609 mScrollCache.fadingEdgeLength = length; 3610 } 3611 3612 /** 3613 * Returns the size of the horizontal faded edges used to indicate that more 3614 * content in this view is visible. 3615 * 3616 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3617 * faded edges are not enabled for this view. 3618 * @attr ref android.R.styleable#View_fadingEdgeLength 3619 */ 3620 public int getHorizontalFadingEdgeLength() { 3621 if (isHorizontalFadingEdgeEnabled()) { 3622 ScrollabilityCache cache = mScrollCache; 3623 if (cache != null) { 3624 return cache.fadingEdgeLength; 3625 } 3626 } 3627 return 0; 3628 } 3629 3630 /** 3631 * Returns the width of the vertical scrollbar. 3632 * 3633 * @return The width in pixels of the vertical scrollbar or 0 if there 3634 * is no vertical scrollbar. 3635 */ 3636 public int getVerticalScrollbarWidth() { 3637 ScrollabilityCache cache = mScrollCache; 3638 if (cache != null) { 3639 ScrollBarDrawable scrollBar = cache.scrollBar; 3640 if (scrollBar != null) { 3641 int size = scrollBar.getSize(true); 3642 if (size <= 0) { 3643 size = cache.scrollBarSize; 3644 } 3645 return size; 3646 } 3647 return 0; 3648 } 3649 return 0; 3650 } 3651 3652 /** 3653 * Returns the height of the horizontal scrollbar. 3654 * 3655 * @return The height in pixels of the horizontal scrollbar or 0 if 3656 * there is no horizontal scrollbar. 3657 */ 3658 protected int getHorizontalScrollbarHeight() { 3659 ScrollabilityCache cache = mScrollCache; 3660 if (cache != null) { 3661 ScrollBarDrawable scrollBar = cache.scrollBar; 3662 if (scrollBar != null) { 3663 int size = scrollBar.getSize(false); 3664 if (size <= 0) { 3665 size = cache.scrollBarSize; 3666 } 3667 return size; 3668 } 3669 return 0; 3670 } 3671 return 0; 3672 } 3673 3674 /** 3675 * <p> 3676 * Initializes the scrollbars from a given set of styled attributes. This 3677 * method should be called by subclasses that need scrollbars and when an 3678 * instance of these subclasses is created programmatically rather than 3679 * being inflated from XML. This method is automatically called when the XML 3680 * is inflated. 3681 * </p> 3682 * 3683 * @param a the styled attributes set to initialize the scrollbars from 3684 */ 3685 protected void initializeScrollbars(TypedArray a) { 3686 initScrollCache(); 3687 3688 final ScrollabilityCache scrollabilityCache = mScrollCache; 3689 3690 if (scrollabilityCache.scrollBar == null) { 3691 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3692 } 3693 3694 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3695 3696 if (!fadeScrollbars) { 3697 scrollabilityCache.state = ScrollabilityCache.ON; 3698 } 3699 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3700 3701 3702 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3703 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3704 .getScrollBarFadeDuration()); 3705 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3706 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3707 ViewConfiguration.getScrollDefaultDelay()); 3708 3709 3710 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3711 com.android.internal.R.styleable.View_scrollbarSize, 3712 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3713 3714 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3715 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3716 3717 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3718 if (thumb != null) { 3719 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3720 } 3721 3722 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3723 false); 3724 if (alwaysDraw) { 3725 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3726 } 3727 3728 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3729 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3730 3731 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3732 if (thumb != null) { 3733 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3734 } 3735 3736 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3737 false); 3738 if (alwaysDraw) { 3739 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3740 } 3741 3742 // Re-apply user/background padding so that scrollbar(s) get added 3743 resolvePadding(); 3744 } 3745 3746 /** 3747 * <p> 3748 * Initalizes the scrollability cache if necessary. 3749 * </p> 3750 */ 3751 private void initScrollCache() { 3752 if (mScrollCache == null) { 3753 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3754 } 3755 } 3756 3757 private ScrollabilityCache getScrollCache() { 3758 initScrollCache(); 3759 return mScrollCache; 3760 } 3761 3762 /** 3763 * Set the position of the vertical scroll bar. Should be one of 3764 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3765 * {@link #SCROLLBAR_POSITION_RIGHT}. 3766 * 3767 * @param position Where the vertical scroll bar should be positioned. 3768 */ 3769 public void setVerticalScrollbarPosition(int position) { 3770 if (mVerticalScrollbarPosition != position) { 3771 mVerticalScrollbarPosition = position; 3772 computeOpaqueFlags(); 3773 resolvePadding(); 3774 } 3775 } 3776 3777 /** 3778 * @return The position where the vertical scroll bar will show, if applicable. 3779 * @see #setVerticalScrollbarPosition(int) 3780 */ 3781 public int getVerticalScrollbarPosition() { 3782 return mVerticalScrollbarPosition; 3783 } 3784 3785 ListenerInfo getListenerInfo() { 3786 if (mListenerInfo != null) { 3787 return mListenerInfo; 3788 } 3789 mListenerInfo = new ListenerInfo(); 3790 return mListenerInfo; 3791 } 3792 3793 /** 3794 * Register a callback to be invoked when focus of this view changed. 3795 * 3796 * @param l The callback that will run. 3797 */ 3798 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3799 getListenerInfo().mOnFocusChangeListener = l; 3800 } 3801 3802 /** 3803 * Add a listener that will be called when the bounds of the view change due to 3804 * layout processing. 3805 * 3806 * @param listener The listener that will be called when layout bounds change. 3807 */ 3808 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3809 ListenerInfo li = getListenerInfo(); 3810 if (li.mOnLayoutChangeListeners == null) { 3811 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3812 } 3813 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3814 li.mOnLayoutChangeListeners.add(listener); 3815 } 3816 } 3817 3818 /** 3819 * Remove a listener for layout changes. 3820 * 3821 * @param listener The listener for layout bounds change. 3822 */ 3823 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3824 ListenerInfo li = mListenerInfo; 3825 if (li == null || li.mOnLayoutChangeListeners == null) { 3826 return; 3827 } 3828 li.mOnLayoutChangeListeners.remove(listener); 3829 } 3830 3831 /** 3832 * Add a listener for attach state changes. 3833 * 3834 * This listener will be called whenever this view is attached or detached 3835 * from a window. Remove the listener using 3836 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3837 * 3838 * @param listener Listener to attach 3839 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3840 */ 3841 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3842 ListenerInfo li = getListenerInfo(); 3843 if (li.mOnAttachStateChangeListeners == null) { 3844 li.mOnAttachStateChangeListeners 3845 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3846 } 3847 li.mOnAttachStateChangeListeners.add(listener); 3848 } 3849 3850 /** 3851 * Remove a listener for attach state changes. The listener will receive no further 3852 * notification of window attach/detach events. 3853 * 3854 * @param listener Listener to remove 3855 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3856 */ 3857 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3858 ListenerInfo li = mListenerInfo; 3859 if (li == null || li.mOnAttachStateChangeListeners == null) { 3860 return; 3861 } 3862 li.mOnAttachStateChangeListeners.remove(listener); 3863 } 3864 3865 /** 3866 * Returns the focus-change callback registered for this view. 3867 * 3868 * @return The callback, or null if one is not registered. 3869 */ 3870 public OnFocusChangeListener getOnFocusChangeListener() { 3871 ListenerInfo li = mListenerInfo; 3872 return li != null ? li.mOnFocusChangeListener : null; 3873 } 3874 3875 /** 3876 * Register a callback to be invoked when this view is clicked. If this view is not 3877 * clickable, it becomes clickable. 3878 * 3879 * @param l The callback that will run 3880 * 3881 * @see #setClickable(boolean) 3882 */ 3883 public void setOnClickListener(OnClickListener l) { 3884 if (!isClickable()) { 3885 setClickable(true); 3886 } 3887 getListenerInfo().mOnClickListener = l; 3888 } 3889 3890 /** 3891 * Return whether this view has an attached OnClickListener. Returns 3892 * true if there is a listener, false if there is none. 3893 */ 3894 public boolean hasOnClickListeners() { 3895 ListenerInfo li = mListenerInfo; 3896 return (li != null && li.mOnClickListener != null); 3897 } 3898 3899 /** 3900 * Register a callback to be invoked when this view is clicked and held. If this view is not 3901 * long clickable, it becomes long clickable. 3902 * 3903 * @param l The callback that will run 3904 * 3905 * @see #setLongClickable(boolean) 3906 */ 3907 public void setOnLongClickListener(OnLongClickListener l) { 3908 if (!isLongClickable()) { 3909 setLongClickable(true); 3910 } 3911 getListenerInfo().mOnLongClickListener = l; 3912 } 3913 3914 /** 3915 * Register a callback to be invoked when the context menu for this view is 3916 * being built. If this view is not long clickable, it becomes long clickable. 3917 * 3918 * @param l The callback that will run 3919 * 3920 */ 3921 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3922 if (!isLongClickable()) { 3923 setLongClickable(true); 3924 } 3925 getListenerInfo().mOnCreateContextMenuListener = l; 3926 } 3927 3928 /** 3929 * Call this view's OnClickListener, if it is defined. Performs all normal 3930 * actions associated with clicking: reporting accessibility event, playing 3931 * a sound, etc. 3932 * 3933 * @return True there was an assigned OnClickListener that was called, false 3934 * otherwise is returned. 3935 */ 3936 public boolean performClick() { 3937 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3938 3939 ListenerInfo li = mListenerInfo; 3940 if (li != null && li.mOnClickListener != null) { 3941 playSoundEffect(SoundEffectConstants.CLICK); 3942 li.mOnClickListener.onClick(this); 3943 return true; 3944 } 3945 3946 return false; 3947 } 3948 3949 /** 3950 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3951 * this only calls the listener, and does not do any associated clicking 3952 * actions like reporting an accessibility event. 3953 * 3954 * @return True there was an assigned OnClickListener that was called, false 3955 * otherwise is returned. 3956 */ 3957 public boolean callOnClick() { 3958 ListenerInfo li = mListenerInfo; 3959 if (li != null && li.mOnClickListener != null) { 3960 li.mOnClickListener.onClick(this); 3961 return true; 3962 } 3963 return false; 3964 } 3965 3966 /** 3967 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3968 * OnLongClickListener did not consume the event. 3969 * 3970 * @return True if one of the above receivers consumed the event, false otherwise. 3971 */ 3972 public boolean performLongClick() { 3973 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3974 3975 boolean handled = false; 3976 ListenerInfo li = mListenerInfo; 3977 if (li != null && li.mOnLongClickListener != null) { 3978 handled = li.mOnLongClickListener.onLongClick(View.this); 3979 } 3980 if (!handled) { 3981 handled = showContextMenu(); 3982 } 3983 if (handled) { 3984 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3985 } 3986 return handled; 3987 } 3988 3989 /** 3990 * Performs button-related actions during a touch down event. 3991 * 3992 * @param event The event. 3993 * @return True if the down was consumed. 3994 * 3995 * @hide 3996 */ 3997 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3998 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3999 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 4000 return true; 4001 } 4002 } 4003 return false; 4004 } 4005 4006 /** 4007 * Bring up the context menu for this view. 4008 * 4009 * @return Whether a context menu was displayed. 4010 */ 4011 public boolean showContextMenu() { 4012 return getParent().showContextMenuForChild(this); 4013 } 4014 4015 /** 4016 * Bring up the context menu for this view, referring to the item under the specified point. 4017 * 4018 * @param x The referenced x coordinate. 4019 * @param y The referenced y coordinate. 4020 * @param metaState The keyboard modifiers that were pressed. 4021 * @return Whether a context menu was displayed. 4022 * 4023 * @hide 4024 */ 4025 public boolean showContextMenu(float x, float y, int metaState) { 4026 return showContextMenu(); 4027 } 4028 4029 /** 4030 * Start an action mode. 4031 * 4032 * @param callback Callback that will control the lifecycle of the action mode 4033 * @return The new action mode if it is started, null otherwise 4034 * 4035 * @see ActionMode 4036 */ 4037 public ActionMode startActionMode(ActionMode.Callback callback) { 4038 ViewParent parent = getParent(); 4039 if (parent == null) return null; 4040 return parent.startActionModeForChild(this, callback); 4041 } 4042 4043 /** 4044 * Register a callback to be invoked when a key is pressed in this view. 4045 * @param l the key listener to attach to this view 4046 */ 4047 public void setOnKeyListener(OnKeyListener l) { 4048 getListenerInfo().mOnKeyListener = l; 4049 } 4050 4051 /** 4052 * Register a callback to be invoked when a touch event is sent to this view. 4053 * @param l the touch listener to attach to this view 4054 */ 4055 public void setOnTouchListener(OnTouchListener l) { 4056 getListenerInfo().mOnTouchListener = l; 4057 } 4058 4059 /** 4060 * Register a callback to be invoked when a generic motion event is sent to this view. 4061 * @param l the generic motion listener to attach to this view 4062 */ 4063 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4064 getListenerInfo().mOnGenericMotionListener = l; 4065 } 4066 4067 /** 4068 * Register a callback to be invoked when a hover event is sent to this view. 4069 * @param l the hover listener to attach to this view 4070 */ 4071 public void setOnHoverListener(OnHoverListener l) { 4072 getListenerInfo().mOnHoverListener = l; 4073 } 4074 4075 /** 4076 * Register a drag event listener callback object for this View. The parameter is 4077 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4078 * View, the system calls the 4079 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4080 * @param l An implementation of {@link android.view.View.OnDragListener}. 4081 */ 4082 public void setOnDragListener(OnDragListener l) { 4083 getListenerInfo().mOnDragListener = l; 4084 } 4085 4086 /** 4087 * Give this view focus. This will cause 4088 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4089 * 4090 * Note: this does not check whether this {@link View} should get focus, it just 4091 * gives it focus no matter what. It should only be called internally by framework 4092 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4093 * 4094 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4095 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4096 * focus moved when requestFocus() is called. It may not always 4097 * apply, in which case use the default View.FOCUS_DOWN. 4098 * @param previouslyFocusedRect The rectangle of the view that had focus 4099 * prior in this View's coordinate system. 4100 */ 4101 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4102 if (DBG) { 4103 System.out.println(this + " requestFocus()"); 4104 } 4105 4106 if ((mPrivateFlags & FOCUSED) == 0) { 4107 mPrivateFlags |= FOCUSED; 4108 4109 if (mParent != null) { 4110 mParent.requestChildFocus(this, this); 4111 } 4112 4113 onFocusChanged(true, direction, previouslyFocusedRect); 4114 refreshDrawableState(); 4115 4116 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4117 notifyAccessibilityStateChanged(); 4118 } 4119 } 4120 } 4121 4122 /** 4123 * Request that a rectangle of this view be visible on the screen, 4124 * scrolling if necessary just enough. 4125 * 4126 * <p>A View should call this if it maintains some notion of which part 4127 * of its content is interesting. For example, a text editing view 4128 * should call this when its cursor moves. 4129 * 4130 * @param rectangle The rectangle. 4131 * @return Whether any parent scrolled. 4132 */ 4133 public boolean requestRectangleOnScreen(Rect rectangle) { 4134 return requestRectangleOnScreen(rectangle, false); 4135 } 4136 4137 /** 4138 * Request that a rectangle of this view be visible on the screen, 4139 * scrolling if necessary just enough. 4140 * 4141 * <p>A View should call this if it maintains some notion of which part 4142 * of its content is interesting. For example, a text editing view 4143 * should call this when its cursor moves. 4144 * 4145 * <p>When <code>immediate</code> is set to true, scrolling will not be 4146 * animated. 4147 * 4148 * @param rectangle The rectangle. 4149 * @param immediate True to forbid animated scrolling, false otherwise 4150 * @return Whether any parent scrolled. 4151 */ 4152 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4153 View child = this; 4154 ViewParent parent = mParent; 4155 boolean scrolled = false; 4156 while (parent != null) { 4157 scrolled |= parent.requestChildRectangleOnScreen(child, 4158 rectangle, immediate); 4159 4160 // offset rect so next call has the rectangle in the 4161 // coordinate system of its direct child. 4162 rectangle.offset(child.getLeft(), child.getTop()); 4163 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4164 4165 if (!(parent instanceof View)) { 4166 break; 4167 } 4168 4169 child = (View) parent; 4170 parent = child.getParent(); 4171 } 4172 return scrolled; 4173 } 4174 4175 /** 4176 * Called when this view wants to give up focus. If focus is cleared 4177 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4178 * <p> 4179 * <strong>Note:</strong> When a View clears focus the framework is trying 4180 * to give focus to the first focusable View from the top. Hence, if this 4181 * View is the first from the top that can take focus, then all callbacks 4182 * related to clearing focus will be invoked after wich the framework will 4183 * give focus to this view. 4184 * </p> 4185 */ 4186 public void clearFocus() { 4187 if (DBG) { 4188 System.out.println(this + " clearFocus()"); 4189 } 4190 4191 if ((mPrivateFlags & FOCUSED) != 0) { 4192 mPrivateFlags &= ~FOCUSED; 4193 4194 if (mParent != null) { 4195 mParent.clearChildFocus(this); 4196 } 4197 4198 onFocusChanged(false, 0, null); 4199 4200 refreshDrawableState(); 4201 4202 ensureInputFocusOnFirstFocusable(); 4203 4204 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4205 notifyAccessibilityStateChanged(); 4206 } 4207 } 4208 } 4209 4210 void ensureInputFocusOnFirstFocusable() { 4211 View root = getRootView(); 4212 if (root != null) { 4213 root.requestFocus(); 4214 } 4215 } 4216 4217 /** 4218 * Called internally by the view system when a new view is getting focus. 4219 * This is what clears the old focus. 4220 */ 4221 void unFocus() { 4222 if (DBG) { 4223 System.out.println(this + " unFocus()"); 4224 } 4225 4226 if ((mPrivateFlags & FOCUSED) != 0) { 4227 mPrivateFlags &= ~FOCUSED; 4228 4229 onFocusChanged(false, 0, null); 4230 refreshDrawableState(); 4231 4232 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4233 notifyAccessibilityStateChanged(); 4234 } 4235 } 4236 } 4237 4238 /** 4239 * Returns true if this view has focus iteself, or is the ancestor of the 4240 * view that has focus. 4241 * 4242 * @return True if this view has or contains focus, false otherwise. 4243 */ 4244 @ViewDebug.ExportedProperty(category = "focus") 4245 public boolean hasFocus() { 4246 return (mPrivateFlags & FOCUSED) != 0; 4247 } 4248 4249 /** 4250 * Returns true if this view is focusable or if it contains a reachable View 4251 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4252 * is a View whose parents do not block descendants focus. 4253 * 4254 * Only {@link #VISIBLE} views are considered focusable. 4255 * 4256 * @return True if the view is focusable or if the view contains a focusable 4257 * View, false otherwise. 4258 * 4259 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4260 */ 4261 public boolean hasFocusable() { 4262 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4263 } 4264 4265 /** 4266 * Called by the view system when the focus state of this view changes. 4267 * When the focus change event is caused by directional navigation, direction 4268 * and previouslyFocusedRect provide insight into where the focus is coming from. 4269 * When overriding, be sure to call up through to the super class so that 4270 * the standard focus handling will occur. 4271 * 4272 * @param gainFocus True if the View has focus; false otherwise. 4273 * @param direction The direction focus has moved when requestFocus() 4274 * is called to give this view focus. Values are 4275 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4276 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4277 * It may not always apply, in which case use the default. 4278 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4279 * system, of the previously focused view. If applicable, this will be 4280 * passed in as finer grained information about where the focus is coming 4281 * from (in addition to direction). Will be <code>null</code> otherwise. 4282 */ 4283 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4284 if (gainFocus) { 4285 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4286 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4287 requestAccessibilityFocus(); 4288 } 4289 } 4290 4291 InputMethodManager imm = InputMethodManager.peekInstance(); 4292 if (!gainFocus) { 4293 if (isPressed()) { 4294 setPressed(false); 4295 } 4296 if (imm != null && mAttachInfo != null 4297 && mAttachInfo.mHasWindowFocus) { 4298 imm.focusOut(this); 4299 } 4300 onFocusLost(); 4301 } else if (imm != null && mAttachInfo != null 4302 && mAttachInfo.mHasWindowFocus) { 4303 imm.focusIn(this); 4304 } 4305 4306 invalidate(true); 4307 ListenerInfo li = mListenerInfo; 4308 if (li != null && li.mOnFocusChangeListener != null) { 4309 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4310 } 4311 4312 if (mAttachInfo != null) { 4313 mAttachInfo.mKeyDispatchState.reset(this); 4314 } 4315 } 4316 4317 /** 4318 * Sends an accessibility event of the given type. If accessiiblity is 4319 * not enabled this method has no effect. The default implementation calls 4320 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4321 * to populate information about the event source (this View), then calls 4322 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4323 * populate the text content of the event source including its descendants, 4324 * and last calls 4325 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4326 * on its parent to resuest sending of the event to interested parties. 4327 * <p> 4328 * If an {@link AccessibilityDelegate} has been specified via calling 4329 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4330 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4331 * responsible for handling this call. 4332 * </p> 4333 * 4334 * @param eventType The type of the event to send, as defined by several types from 4335 * {@link android.view.accessibility.AccessibilityEvent}, such as 4336 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4337 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4338 * 4339 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4340 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4341 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4342 * @see AccessibilityDelegate 4343 */ 4344 public void sendAccessibilityEvent(int eventType) { 4345 if (mAccessibilityDelegate != null) { 4346 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4347 } else { 4348 sendAccessibilityEventInternal(eventType); 4349 } 4350 } 4351 4352 /** 4353 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4354 * {@link AccessibilityEvent} to make an announcement which is related to some 4355 * sort of a context change for which none of the events representing UI transitions 4356 * is a good fit. For example, announcing a new page in a book. If accessibility 4357 * is not enabled this method does nothing. 4358 * 4359 * @param text The announcement text. 4360 */ 4361 public void announceForAccessibility(CharSequence text) { 4362 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4363 AccessibilityEvent event = AccessibilityEvent.obtain( 4364 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4365 event.getText().add(text); 4366 sendAccessibilityEventUnchecked(event); 4367 } 4368 } 4369 4370 /** 4371 * @see #sendAccessibilityEvent(int) 4372 * 4373 * Note: Called from the default {@link AccessibilityDelegate}. 4374 */ 4375 void sendAccessibilityEventInternal(int eventType) { 4376 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4377 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4378 } 4379 } 4380 4381 /** 4382 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4383 * takes as an argument an empty {@link AccessibilityEvent} and does not 4384 * perform a check whether accessibility is enabled. 4385 * <p> 4386 * If an {@link AccessibilityDelegate} has been specified via calling 4387 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4388 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4389 * is responsible for handling this call. 4390 * </p> 4391 * 4392 * @param event The event to send. 4393 * 4394 * @see #sendAccessibilityEvent(int) 4395 */ 4396 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4397 if (mAccessibilityDelegate != null) { 4398 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4399 } else { 4400 sendAccessibilityEventUncheckedInternal(event); 4401 } 4402 } 4403 4404 /** 4405 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4406 * 4407 * Note: Called from the default {@link AccessibilityDelegate}. 4408 */ 4409 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4410 if (!isShown()) { 4411 return; 4412 } 4413 onInitializeAccessibilityEvent(event); 4414 // Only a subset of accessibility events populates text content. 4415 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4416 dispatchPopulateAccessibilityEvent(event); 4417 } 4418 // Intercept accessibility focus events fired by virtual nodes to keep 4419 // track of accessibility focus position in such nodes. 4420 final int eventType = event.getEventType(); 4421 switch (eventType) { 4422 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4423 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4424 event.getSourceNodeId()); 4425 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4426 ViewRootImpl viewRootImpl = getViewRootImpl(); 4427 if (viewRootImpl != null) { 4428 viewRootImpl.setAccessibilityFocusedHost(this); 4429 } 4430 } 4431 } break; 4432 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4433 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4434 event.getSourceNodeId()); 4435 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4436 ViewRootImpl viewRootImpl = getViewRootImpl(); 4437 if (viewRootImpl != null) { 4438 viewRootImpl.setAccessibilityFocusedHost(null); 4439 } 4440 } 4441 } break; 4442 } 4443 // In the beginning we called #isShown(), so we know that getParent() is not null. 4444 getParent().requestSendAccessibilityEvent(this, event); 4445 } 4446 4447 /** 4448 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4449 * to its children for adding their text content to the event. Note that the 4450 * event text is populated in a separate dispatch path since we add to the 4451 * event not only the text of the source but also the text of all its descendants. 4452 * A typical implementation will call 4453 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4454 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4455 * on each child. Override this method if custom population of the event text 4456 * content is required. 4457 * <p> 4458 * If an {@link AccessibilityDelegate} has been specified via calling 4459 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4460 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4461 * is responsible for handling this call. 4462 * </p> 4463 * <p> 4464 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4465 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4466 * </p> 4467 * 4468 * @param event The event. 4469 * 4470 * @return True if the event population was completed. 4471 */ 4472 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4473 if (mAccessibilityDelegate != null) { 4474 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4475 } else { 4476 return dispatchPopulateAccessibilityEventInternal(event); 4477 } 4478 } 4479 4480 /** 4481 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4482 * 4483 * Note: Called from the default {@link AccessibilityDelegate}. 4484 */ 4485 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4486 onPopulateAccessibilityEvent(event); 4487 return false; 4488 } 4489 4490 /** 4491 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4492 * giving a chance to this View to populate the accessibility event with its 4493 * text content. While this method is free to modify event 4494 * attributes other than text content, doing so should normally be performed in 4495 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4496 * <p> 4497 * Example: Adding formatted date string to an accessibility event in addition 4498 * to the text added by the super implementation: 4499 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4500 * super.onPopulateAccessibilityEvent(event); 4501 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4502 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4503 * mCurrentDate.getTimeInMillis(), flags); 4504 * event.getText().add(selectedDateUtterance); 4505 * }</pre> 4506 * <p> 4507 * If an {@link AccessibilityDelegate} has been specified via calling 4508 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4509 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4510 * is responsible for handling this call. 4511 * </p> 4512 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4513 * information to the event, in case the default implementation has basic information to add. 4514 * </p> 4515 * 4516 * @param event The accessibility event which to populate. 4517 * 4518 * @see #sendAccessibilityEvent(int) 4519 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4520 */ 4521 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4522 if (mAccessibilityDelegate != null) { 4523 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4524 } else { 4525 onPopulateAccessibilityEventInternal(event); 4526 } 4527 } 4528 4529 /** 4530 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4531 * 4532 * Note: Called from the default {@link AccessibilityDelegate}. 4533 */ 4534 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4535 4536 } 4537 4538 /** 4539 * Initializes an {@link AccessibilityEvent} with information about 4540 * this View which is the event source. In other words, the source of 4541 * an accessibility event is the view whose state change triggered firing 4542 * the event. 4543 * <p> 4544 * Example: Setting the password property of an event in addition 4545 * to properties set by the super implementation: 4546 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4547 * super.onInitializeAccessibilityEvent(event); 4548 * event.setPassword(true); 4549 * }</pre> 4550 * <p> 4551 * If an {@link AccessibilityDelegate} has been specified via calling 4552 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4553 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4554 * is responsible for handling this call. 4555 * </p> 4556 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4557 * information to the event, in case the default implementation has basic information to add. 4558 * </p> 4559 * @param event The event to initialize. 4560 * 4561 * @see #sendAccessibilityEvent(int) 4562 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4563 */ 4564 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4565 if (mAccessibilityDelegate != null) { 4566 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4567 } else { 4568 onInitializeAccessibilityEventInternal(event); 4569 } 4570 } 4571 4572 /** 4573 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4574 * 4575 * Note: Called from the default {@link AccessibilityDelegate}. 4576 */ 4577 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4578 event.setSource(this); 4579 event.setClassName(View.class.getName()); 4580 event.setPackageName(getContext().getPackageName()); 4581 event.setEnabled(isEnabled()); 4582 event.setContentDescription(mContentDescription); 4583 4584 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4585 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4586 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4587 FOCUSABLES_ALL); 4588 event.setItemCount(focusablesTempList.size()); 4589 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4590 focusablesTempList.clear(); 4591 } 4592 } 4593 4594 /** 4595 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4596 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4597 * This method is responsible for obtaining an accessibility node info from a 4598 * pool of reusable instances and calling 4599 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4600 * initialize the former. 4601 * <p> 4602 * Note: The client is responsible for recycling the obtained instance by calling 4603 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4604 * </p> 4605 * 4606 * @return A populated {@link AccessibilityNodeInfo}. 4607 * 4608 * @see AccessibilityNodeInfo 4609 */ 4610 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4611 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4612 if (provider != null) { 4613 return provider.createAccessibilityNodeInfo(View.NO_ID); 4614 } else { 4615 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4616 onInitializeAccessibilityNodeInfo(info); 4617 return info; 4618 } 4619 } 4620 4621 /** 4622 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4623 * The base implementation sets: 4624 * <ul> 4625 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4626 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4627 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4628 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4629 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4630 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4631 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4632 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4633 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4634 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4635 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4636 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4637 * </ul> 4638 * <p> 4639 * Subclasses should override this method, call the super implementation, 4640 * and set additional attributes. 4641 * </p> 4642 * <p> 4643 * If an {@link AccessibilityDelegate} has been specified via calling 4644 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4645 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4646 * is responsible for handling this call. 4647 * </p> 4648 * 4649 * @param info The instance to initialize. 4650 */ 4651 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4652 if (mAccessibilityDelegate != null) { 4653 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4654 } else { 4655 onInitializeAccessibilityNodeInfoInternal(info); 4656 } 4657 } 4658 4659 /** 4660 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4661 * 4662 * Note: Called from the default {@link AccessibilityDelegate}. 4663 */ 4664 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4665 Rect bounds = mAttachInfo.mTmpInvalRect; 4666 getDrawingRect(bounds); 4667 info.setBoundsInParent(bounds); 4668 4669 getGlobalVisibleRect(bounds); 4670 bounds.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4671 info.setBoundsInScreen(bounds); 4672 4673 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4674 ViewParent parent = getParentForAccessibility(); 4675 if (parent instanceof View) { 4676 info.setParent((View) parent); 4677 } 4678 } 4679 4680 info.setPackageName(mContext.getPackageName()); 4681 info.setClassName(View.class.getName()); 4682 info.setContentDescription(getContentDescription()); 4683 4684 info.setEnabled(isEnabled()); 4685 info.setClickable(isClickable()); 4686 info.setFocusable(isFocusable()); 4687 info.setFocused(isFocused()); 4688 info.setAccessibilityFocused(isAccessibilityFocused()); 4689 info.setSelected(isSelected()); 4690 info.setLongClickable(isLongClickable()); 4691 4692 // TODO: These make sense only if we are in an AdapterView but all 4693 // views can be selected. Maybe from accessiiblity perspective 4694 // we should report as selectable view in an AdapterView. 4695 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4696 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4697 4698 if (isFocusable()) { 4699 if (isFocused()) { 4700 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4701 } else { 4702 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4703 } 4704 } 4705 4706 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4707 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4708 4709 if (isClickable()) { 4710 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4711 } 4712 4713 if (isLongClickable()) { 4714 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4715 } 4716 4717 if (getContentDescription() != null) { 4718 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_GRANULARITY); 4719 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_GRANULARITY); 4720 info.setGranularities(AccessibilityNodeInfo.GRANULARITY_CHARACTER 4721 | AccessibilityNodeInfo.GRANULARITY_WORD); 4722 } 4723 } 4724 4725 /** 4726 * Computes whether this view is visible on the screen. 4727 * 4728 * @return Whether the view is visible on the screen. 4729 */ 4730 boolean isDisplayedOnScreen() { 4731 // The first two checks are made also made by isShown() which 4732 // however traverses the tree up to the parent to catch that. 4733 // Therefore, we do some fail fast check to minimize the up 4734 // tree traversal. 4735 return (mAttachInfo != null 4736 && mAttachInfo.mWindowVisibility == View.VISIBLE 4737 && getAlpha() > 0 4738 && isShown() 4739 && getGlobalVisibleRect(mAttachInfo.mTmpInvalRect)); 4740 } 4741 4742 /** 4743 * Sets a delegate for implementing accessibility support via compositon as 4744 * opposed to inheritance. The delegate's primary use is for implementing 4745 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4746 * 4747 * @param delegate The delegate instance. 4748 * 4749 * @see AccessibilityDelegate 4750 */ 4751 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4752 mAccessibilityDelegate = delegate; 4753 } 4754 4755 /** 4756 * Gets the provider for managing a virtual view hierarchy rooted at this View 4757 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4758 * that explore the window content. 4759 * <p> 4760 * If this method returns an instance, this instance is responsible for managing 4761 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4762 * View including the one representing the View itself. Similarly the returned 4763 * instance is responsible for performing accessibility actions on any virtual 4764 * view or the root view itself. 4765 * </p> 4766 * <p> 4767 * If an {@link AccessibilityDelegate} has been specified via calling 4768 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4769 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4770 * is responsible for handling this call. 4771 * </p> 4772 * 4773 * @return The provider. 4774 * 4775 * @see AccessibilityNodeProvider 4776 */ 4777 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4778 if (mAccessibilityDelegate != null) { 4779 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4780 } else { 4781 return null; 4782 } 4783 } 4784 4785 /** 4786 * Gets the unique identifier of this view on the screen for accessibility purposes. 4787 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4788 * 4789 * @return The view accessibility id. 4790 * 4791 * @hide 4792 */ 4793 public int getAccessibilityViewId() { 4794 if (mAccessibilityViewId == NO_ID) { 4795 mAccessibilityViewId = sNextAccessibilityViewId++; 4796 } 4797 return mAccessibilityViewId; 4798 } 4799 4800 /** 4801 * Gets the unique identifier of the window in which this View reseides. 4802 * 4803 * @return The window accessibility id. 4804 * 4805 * @hide 4806 */ 4807 public int getAccessibilityWindowId() { 4808 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4809 } 4810 4811 /** 4812 * Gets the {@link View} description. It briefly describes the view and is 4813 * primarily used for accessibility support. Set this property to enable 4814 * better accessibility support for your application. This is especially 4815 * true for views that do not have textual representation (For example, 4816 * ImageButton). 4817 * 4818 * @return The content description. 4819 * 4820 * @attr ref android.R.styleable#View_contentDescription 4821 */ 4822 @ViewDebug.ExportedProperty(category = "accessibility") 4823 public CharSequence getContentDescription() { 4824 return mContentDescription; 4825 } 4826 4827 /** 4828 * Sets the {@link View} description. It briefly describes the view and is 4829 * primarily used for accessibility support. Set this property to enable 4830 * better accessibility support for your application. This is especially 4831 * true for views that do not have textual representation (For example, 4832 * ImageButton). 4833 * 4834 * @param contentDescription The content description. 4835 * 4836 * @attr ref android.R.styleable#View_contentDescription 4837 */ 4838 @RemotableViewMethod 4839 public void setContentDescription(CharSequence contentDescription) { 4840 mContentDescription = contentDescription; 4841 } 4842 4843 /** 4844 * Invoked whenever this view loses focus, either by losing window focus or by losing 4845 * focus within its window. This method can be used to clear any state tied to the 4846 * focus. For instance, if a button is held pressed with the trackball and the window 4847 * loses focus, this method can be used to cancel the press. 4848 * 4849 * Subclasses of View overriding this method should always call super.onFocusLost(). 4850 * 4851 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4852 * @see #onWindowFocusChanged(boolean) 4853 * 4854 * @hide pending API council approval 4855 */ 4856 protected void onFocusLost() { 4857 resetPressedState(); 4858 } 4859 4860 private void resetPressedState() { 4861 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4862 return; 4863 } 4864 4865 if (isPressed()) { 4866 setPressed(false); 4867 4868 if (!mHasPerformedLongPress) { 4869 removeLongPressCallback(); 4870 } 4871 } 4872 } 4873 4874 /** 4875 * Returns true if this view has focus 4876 * 4877 * @return True if this view has focus, false otherwise. 4878 */ 4879 @ViewDebug.ExportedProperty(category = "focus") 4880 public boolean isFocused() { 4881 return (mPrivateFlags & FOCUSED) != 0; 4882 } 4883 4884 /** 4885 * Find the view in the hierarchy rooted at this view that currently has 4886 * focus. 4887 * 4888 * @return The view that currently has focus, or null if no focused view can 4889 * be found. 4890 */ 4891 public View findFocus() { 4892 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4893 } 4894 4895 /** 4896 * Indicates whether this view is one of the set of scrollable containers in 4897 * its window. 4898 * 4899 * @return whether this view is one of the set of scrollable containers in 4900 * its window 4901 * 4902 * @attr ref android.R.styleable#View_isScrollContainer 4903 */ 4904 public boolean isScrollContainer() { 4905 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 4906 } 4907 4908 /** 4909 * Change whether this view is one of the set of scrollable containers in 4910 * its window. This will be used to determine whether the window can 4911 * resize or must pan when a soft input area is open -- scrollable 4912 * containers allow the window to use resize mode since the container 4913 * will appropriately shrink. 4914 * 4915 * @attr ref android.R.styleable#View_isScrollContainer 4916 */ 4917 public void setScrollContainer(boolean isScrollContainer) { 4918 if (isScrollContainer) { 4919 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4920 mAttachInfo.mScrollContainers.add(this); 4921 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4922 } 4923 mPrivateFlags |= SCROLL_CONTAINER; 4924 } else { 4925 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4926 mAttachInfo.mScrollContainers.remove(this); 4927 } 4928 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4929 } 4930 } 4931 4932 /** 4933 * Returns the quality of the drawing cache. 4934 * 4935 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4936 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4937 * 4938 * @see #setDrawingCacheQuality(int) 4939 * @see #setDrawingCacheEnabled(boolean) 4940 * @see #isDrawingCacheEnabled() 4941 * 4942 * @attr ref android.R.styleable#View_drawingCacheQuality 4943 */ 4944 public int getDrawingCacheQuality() { 4945 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4946 } 4947 4948 /** 4949 * Set the drawing cache quality of this view. This value is used only when the 4950 * drawing cache is enabled 4951 * 4952 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4953 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4954 * 4955 * @see #getDrawingCacheQuality() 4956 * @see #setDrawingCacheEnabled(boolean) 4957 * @see #isDrawingCacheEnabled() 4958 * 4959 * @attr ref android.R.styleable#View_drawingCacheQuality 4960 */ 4961 public void setDrawingCacheQuality(int quality) { 4962 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4963 } 4964 4965 /** 4966 * Returns whether the screen should remain on, corresponding to the current 4967 * value of {@link #KEEP_SCREEN_ON}. 4968 * 4969 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4970 * 4971 * @see #setKeepScreenOn(boolean) 4972 * 4973 * @attr ref android.R.styleable#View_keepScreenOn 4974 */ 4975 public boolean getKeepScreenOn() { 4976 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4977 } 4978 4979 /** 4980 * Controls whether the screen should remain on, modifying the 4981 * value of {@link #KEEP_SCREEN_ON}. 4982 * 4983 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4984 * 4985 * @see #getKeepScreenOn() 4986 * 4987 * @attr ref android.R.styleable#View_keepScreenOn 4988 */ 4989 public void setKeepScreenOn(boolean keepScreenOn) { 4990 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4991 } 4992 4993 /** 4994 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4995 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4996 * 4997 * @attr ref android.R.styleable#View_nextFocusLeft 4998 */ 4999 public int getNextFocusLeftId() { 5000 return mNextFocusLeftId; 5001 } 5002 5003 /** 5004 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 5005 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 5006 * decide automatically. 5007 * 5008 * @attr ref android.R.styleable#View_nextFocusLeft 5009 */ 5010 public void setNextFocusLeftId(int nextFocusLeftId) { 5011 mNextFocusLeftId = nextFocusLeftId; 5012 } 5013 5014 /** 5015 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5016 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5017 * 5018 * @attr ref android.R.styleable#View_nextFocusRight 5019 */ 5020 public int getNextFocusRightId() { 5021 return mNextFocusRightId; 5022 } 5023 5024 /** 5025 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5026 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5027 * decide automatically. 5028 * 5029 * @attr ref android.R.styleable#View_nextFocusRight 5030 */ 5031 public void setNextFocusRightId(int nextFocusRightId) { 5032 mNextFocusRightId = nextFocusRightId; 5033 } 5034 5035 /** 5036 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5037 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5038 * 5039 * @attr ref android.R.styleable#View_nextFocusUp 5040 */ 5041 public int getNextFocusUpId() { 5042 return mNextFocusUpId; 5043 } 5044 5045 /** 5046 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5047 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5048 * decide automatically. 5049 * 5050 * @attr ref android.R.styleable#View_nextFocusUp 5051 */ 5052 public void setNextFocusUpId(int nextFocusUpId) { 5053 mNextFocusUpId = nextFocusUpId; 5054 } 5055 5056 /** 5057 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5058 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5059 * 5060 * @attr ref android.R.styleable#View_nextFocusDown 5061 */ 5062 public int getNextFocusDownId() { 5063 return mNextFocusDownId; 5064 } 5065 5066 /** 5067 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5068 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5069 * decide automatically. 5070 * 5071 * @attr ref android.R.styleable#View_nextFocusDown 5072 */ 5073 public void setNextFocusDownId(int nextFocusDownId) { 5074 mNextFocusDownId = nextFocusDownId; 5075 } 5076 5077 /** 5078 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5079 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5080 * 5081 * @attr ref android.R.styleable#View_nextFocusForward 5082 */ 5083 public int getNextFocusForwardId() { 5084 return mNextFocusForwardId; 5085 } 5086 5087 /** 5088 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5089 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5090 * decide automatically. 5091 * 5092 * @attr ref android.R.styleable#View_nextFocusForward 5093 */ 5094 public void setNextFocusForwardId(int nextFocusForwardId) { 5095 mNextFocusForwardId = nextFocusForwardId; 5096 } 5097 5098 /** 5099 * Returns the visibility of this view and all of its ancestors 5100 * 5101 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5102 */ 5103 public boolean isShown() { 5104 View current = this; 5105 //noinspection ConstantConditions 5106 do { 5107 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5108 return false; 5109 } 5110 ViewParent parent = current.mParent; 5111 if (parent == null) { 5112 return false; // We are not attached to the view root 5113 } 5114 if (!(parent instanceof View)) { 5115 return true; 5116 } 5117 current = (View) parent; 5118 } while (current != null); 5119 5120 return false; 5121 } 5122 5123 /** 5124 * Called by the view hierarchy when the content insets for a window have 5125 * changed, to allow it to adjust its content to fit within those windows. 5126 * The content insets tell you the space that the status bar, input method, 5127 * and other system windows infringe on the application's window. 5128 * 5129 * <p>You do not normally need to deal with this function, since the default 5130 * window decoration given to applications takes care of applying it to the 5131 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5132 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5133 * and your content can be placed under those system elements. You can then 5134 * use this method within your view hierarchy if you have parts of your UI 5135 * which you would like to ensure are not being covered. 5136 * 5137 * <p>The default implementation of this method simply applies the content 5138 * inset's to the view's padding. This can be enabled through 5139 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5140 * the method and handle the insets however you would like. Note that the 5141 * insets provided by the framework are always relative to the far edges 5142 * of the window, not accounting for the location of the called view within 5143 * that window. (In fact when this method is called you do not yet know 5144 * where the layout will place the view, as it is done before layout happens.) 5145 * 5146 * <p>Note: unlike many View methods, there is no dispatch phase to this 5147 * call. If you are overriding it in a ViewGroup and want to allow the 5148 * call to continue to your children, you must be sure to call the super 5149 * implementation. 5150 * 5151 * @param insets Current content insets of the window. Prior to 5152 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5153 * the insets or else you and Android will be unhappy. 5154 * 5155 * @return Return true if this view applied the insets and it should not 5156 * continue propagating further down the hierarchy, false otherwise. 5157 */ 5158 protected boolean fitSystemWindows(Rect insets) { 5159 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5160 mUserPaddingStart = -1; 5161 mUserPaddingEnd = -1; 5162 mUserPaddingRelative = false; 5163 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5164 || mAttachInfo == null 5165 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5166 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5167 return true; 5168 } else { 5169 internalSetPadding(0, 0, 0, 0); 5170 return false; 5171 } 5172 } 5173 return false; 5174 } 5175 5176 /** 5177 * Set whether or not this view should account for system screen decorations 5178 * such as the status bar and inset its content. This allows this view to be 5179 * positioned in absolute screen coordinates and remain visible to the user. 5180 * 5181 * <p>This should only be used by top-level window decor views. 5182 * 5183 * @param fitSystemWindows true to inset content for system screen decorations, false for 5184 * default behavior. 5185 * 5186 * @attr ref android.R.styleable#View_fitsSystemWindows 5187 */ 5188 public void setFitsSystemWindows(boolean fitSystemWindows) { 5189 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5190 } 5191 5192 /** 5193 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 5194 * will account for system screen decorations such as the status bar and inset its 5195 * content. This allows the view to be positioned in absolute screen coordinates 5196 * and remain visible to the user. 5197 * 5198 * @return true if this view will adjust its content bounds for system screen decorations. 5199 * 5200 * @attr ref android.R.styleable#View_fitsSystemWindows 5201 */ 5202 public boolean fitsSystemWindows() { 5203 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5204 } 5205 5206 /** 5207 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5208 */ 5209 public void requestFitSystemWindows() { 5210 if (mParent != null) { 5211 mParent.requestFitSystemWindows(); 5212 } 5213 } 5214 5215 /** 5216 * For use by PhoneWindow to make its own system window fitting optional. 5217 * @hide 5218 */ 5219 public void makeOptionalFitsSystemWindows() { 5220 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5221 } 5222 5223 /** 5224 * Returns the visibility status for this view. 5225 * 5226 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5227 * @attr ref android.R.styleable#View_visibility 5228 */ 5229 @ViewDebug.ExportedProperty(mapping = { 5230 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5231 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5232 @ViewDebug.IntToString(from = GONE, to = "GONE") 5233 }) 5234 public int getVisibility() { 5235 return mViewFlags & VISIBILITY_MASK; 5236 } 5237 5238 /** 5239 * Set the enabled state of this view. 5240 * 5241 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5242 * @attr ref android.R.styleable#View_visibility 5243 */ 5244 @RemotableViewMethod 5245 public void setVisibility(int visibility) { 5246 setFlags(visibility, VISIBILITY_MASK); 5247 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5248 } 5249 5250 /** 5251 * Returns the enabled status for this view. The interpretation of the 5252 * enabled state varies by subclass. 5253 * 5254 * @return True if this view is enabled, false otherwise. 5255 */ 5256 @ViewDebug.ExportedProperty 5257 public boolean isEnabled() { 5258 return (mViewFlags & ENABLED_MASK) == ENABLED; 5259 } 5260 5261 /** 5262 * Set the enabled state of this view. The interpretation of the enabled 5263 * state varies by subclass. 5264 * 5265 * @param enabled True if this view is enabled, false otherwise. 5266 */ 5267 @RemotableViewMethod 5268 public void setEnabled(boolean enabled) { 5269 if (enabled == isEnabled()) return; 5270 5271 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5272 5273 /* 5274 * The View most likely has to change its appearance, so refresh 5275 * the drawable state. 5276 */ 5277 refreshDrawableState(); 5278 5279 // Invalidate too, since the default behavior for views is to be 5280 // be drawn at 50% alpha rather than to change the drawable. 5281 invalidate(true); 5282 } 5283 5284 /** 5285 * Set whether this view can receive the focus. 5286 * 5287 * Setting this to false will also ensure that this view is not focusable 5288 * in touch mode. 5289 * 5290 * @param focusable If true, this view can receive the focus. 5291 * 5292 * @see #setFocusableInTouchMode(boolean) 5293 * @attr ref android.R.styleable#View_focusable 5294 */ 5295 public void setFocusable(boolean focusable) { 5296 if (!focusable) { 5297 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5298 } 5299 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5300 } 5301 5302 /** 5303 * Set whether this view can receive focus while in touch mode. 5304 * 5305 * Setting this to true will also ensure that this view is focusable. 5306 * 5307 * @param focusableInTouchMode If true, this view can receive the focus while 5308 * in touch mode. 5309 * 5310 * @see #setFocusable(boolean) 5311 * @attr ref android.R.styleable#View_focusableInTouchMode 5312 */ 5313 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5314 // Focusable in touch mode should always be set before the focusable flag 5315 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5316 // which, in touch mode, will not successfully request focus on this view 5317 // because the focusable in touch mode flag is not set 5318 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5319 if (focusableInTouchMode) { 5320 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5321 } 5322 } 5323 5324 /** 5325 * Set whether this view should have sound effects enabled for events such as 5326 * clicking and touching. 5327 * 5328 * <p>You may wish to disable sound effects for a view if you already play sounds, 5329 * for instance, a dial key that plays dtmf tones. 5330 * 5331 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5332 * @see #isSoundEffectsEnabled() 5333 * @see #playSoundEffect(int) 5334 * @attr ref android.R.styleable#View_soundEffectsEnabled 5335 */ 5336 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5337 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5338 } 5339 5340 /** 5341 * @return whether this view should have sound effects enabled for events such as 5342 * clicking and touching. 5343 * 5344 * @see #setSoundEffectsEnabled(boolean) 5345 * @see #playSoundEffect(int) 5346 * @attr ref android.R.styleable#View_soundEffectsEnabled 5347 */ 5348 @ViewDebug.ExportedProperty 5349 public boolean isSoundEffectsEnabled() { 5350 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5351 } 5352 5353 /** 5354 * Set whether this view should have haptic feedback for events such as 5355 * long presses. 5356 * 5357 * <p>You may wish to disable haptic feedback if your view already controls 5358 * its own haptic feedback. 5359 * 5360 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5361 * @see #isHapticFeedbackEnabled() 5362 * @see #performHapticFeedback(int) 5363 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5364 */ 5365 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5366 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5367 } 5368 5369 /** 5370 * @return whether this view should have haptic feedback enabled for events 5371 * long presses. 5372 * 5373 * @see #setHapticFeedbackEnabled(boolean) 5374 * @see #performHapticFeedback(int) 5375 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5376 */ 5377 @ViewDebug.ExportedProperty 5378 public boolean isHapticFeedbackEnabled() { 5379 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5380 } 5381 5382 /** 5383 * Returns the layout direction for this view. 5384 * 5385 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5386 * {@link #LAYOUT_DIRECTION_RTL}, 5387 * {@link #LAYOUT_DIRECTION_INHERIT} or 5388 * {@link #LAYOUT_DIRECTION_LOCALE}. 5389 * 5390 * @attr ref android.R.styleable#View_layoutDirection 5391 * @hide 5392 */ 5393 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5394 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5395 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5396 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5397 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5398 }) 5399 public int getLayoutDirection() { 5400 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5401 } 5402 5403 /** 5404 * Set the layout direction for this view. This will propagate a reset of layout direction 5405 * resolution to the view's children and resolve layout direction for this view. 5406 * 5407 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5408 * {@link #LAYOUT_DIRECTION_RTL}, 5409 * {@link #LAYOUT_DIRECTION_INHERIT} or 5410 * {@link #LAYOUT_DIRECTION_LOCALE}. 5411 * 5412 * @attr ref android.R.styleable#View_layoutDirection 5413 * @hide 5414 */ 5415 @RemotableViewMethod 5416 public void setLayoutDirection(int layoutDirection) { 5417 if (getLayoutDirection() != layoutDirection) { 5418 // Reset the current layout direction and the resolved one 5419 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5420 resetResolvedLayoutDirection(); 5421 // Set the new layout direction (filtered) and ask for a layout pass 5422 mPrivateFlags2 |= 5423 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5424 requestLayout(); 5425 } 5426 } 5427 5428 /** 5429 * Returns the resolved layout direction for this view. 5430 * 5431 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5432 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5433 * @hide 5434 */ 5435 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5436 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5437 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5438 }) 5439 public int getResolvedLayoutDirection() { 5440 // The layout diretion will be resolved only if needed 5441 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5442 resolveLayoutDirection(); 5443 } 5444 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5445 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5446 } 5447 5448 /** 5449 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5450 * layout attribute and/or the inherited value from the parent 5451 * 5452 * @return true if the layout is right-to-left. 5453 * @hide 5454 */ 5455 @ViewDebug.ExportedProperty(category = "layout") 5456 public boolean isLayoutRtl() { 5457 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5458 } 5459 5460 /** 5461 * Indicates whether the view is currently tracking transient state that the 5462 * app should not need to concern itself with saving and restoring, but that 5463 * the framework should take special note to preserve when possible. 5464 * 5465 * <p>A view with transient state cannot be trivially rebound from an external 5466 * data source, such as an adapter binding item views in a list. This may be 5467 * because the view is performing an animation, tracking user selection 5468 * of content, or similar.</p> 5469 * 5470 * @return true if the view has transient state 5471 */ 5472 @ViewDebug.ExportedProperty(category = "layout") 5473 public boolean hasTransientState() { 5474 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5475 } 5476 5477 /** 5478 * Set whether this view is currently tracking transient state that the 5479 * framework should attempt to preserve when possible. This flag is reference counted, 5480 * so every call to setHasTransientState(true) should be paired with a later call 5481 * to setHasTransientState(false). 5482 * 5483 * <p>A view with transient state cannot be trivially rebound from an external 5484 * data source, such as an adapter binding item views in a list. This may be 5485 * because the view is performing an animation, tracking user selection 5486 * of content, or similar.</p> 5487 * 5488 * @param hasTransientState true if this view has transient state 5489 */ 5490 public void setHasTransientState(boolean hasTransientState) { 5491 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5492 mTransientStateCount - 1; 5493 if (mTransientStateCount < 0) { 5494 mTransientStateCount = 0; 5495 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5496 "unmatched pair of setHasTransientState calls"); 5497 } 5498 if ((hasTransientState && mTransientStateCount == 1) || 5499 (hasTransientState && mTransientStateCount == 0)) { 5500 // update flag if we've just incremented up from 0 or decremented down to 0 5501 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5502 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5503 if (mParent != null) { 5504 try { 5505 mParent.childHasTransientStateChanged(this, hasTransientState); 5506 } catch (AbstractMethodError e) { 5507 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5508 " does not fully implement ViewParent", e); 5509 } 5510 } 5511 } 5512 } 5513 5514 /** 5515 * If this view doesn't do any drawing on its own, set this flag to 5516 * allow further optimizations. By default, this flag is not set on 5517 * View, but could be set on some View subclasses such as ViewGroup. 5518 * 5519 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5520 * you should clear this flag. 5521 * 5522 * @param willNotDraw whether or not this View draw on its own 5523 */ 5524 public void setWillNotDraw(boolean willNotDraw) { 5525 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5526 } 5527 5528 /** 5529 * Returns whether or not this View draws on its own. 5530 * 5531 * @return true if this view has nothing to draw, false otherwise 5532 */ 5533 @ViewDebug.ExportedProperty(category = "drawing") 5534 public boolean willNotDraw() { 5535 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5536 } 5537 5538 /** 5539 * When a View's drawing cache is enabled, drawing is redirected to an 5540 * offscreen bitmap. Some views, like an ImageView, must be able to 5541 * bypass this mechanism if they already draw a single bitmap, to avoid 5542 * unnecessary usage of the memory. 5543 * 5544 * @param willNotCacheDrawing true if this view does not cache its 5545 * drawing, false otherwise 5546 */ 5547 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5548 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5549 } 5550 5551 /** 5552 * Returns whether or not this View can cache its drawing or not. 5553 * 5554 * @return true if this view does not cache its drawing, false otherwise 5555 */ 5556 @ViewDebug.ExportedProperty(category = "drawing") 5557 public boolean willNotCacheDrawing() { 5558 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5559 } 5560 5561 /** 5562 * Indicates whether this view reacts to click events or not. 5563 * 5564 * @return true if the view is clickable, false otherwise 5565 * 5566 * @see #setClickable(boolean) 5567 * @attr ref android.R.styleable#View_clickable 5568 */ 5569 @ViewDebug.ExportedProperty 5570 public boolean isClickable() { 5571 return (mViewFlags & CLICKABLE) == CLICKABLE; 5572 } 5573 5574 /** 5575 * Enables or disables click events for this view. When a view 5576 * is clickable it will change its state to "pressed" on every click. 5577 * Subclasses should set the view clickable to visually react to 5578 * user's clicks. 5579 * 5580 * @param clickable true to make the view clickable, false otherwise 5581 * 5582 * @see #isClickable() 5583 * @attr ref android.R.styleable#View_clickable 5584 */ 5585 public void setClickable(boolean clickable) { 5586 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5587 } 5588 5589 /** 5590 * Indicates whether this view reacts to long click events or not. 5591 * 5592 * @return true if the view is long clickable, false otherwise 5593 * 5594 * @see #setLongClickable(boolean) 5595 * @attr ref android.R.styleable#View_longClickable 5596 */ 5597 public boolean isLongClickable() { 5598 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5599 } 5600 5601 /** 5602 * Enables or disables long click events for this view. When a view is long 5603 * clickable it reacts to the user holding down the button for a longer 5604 * duration than a tap. This event can either launch the listener or a 5605 * context menu. 5606 * 5607 * @param longClickable true to make the view long clickable, false otherwise 5608 * @see #isLongClickable() 5609 * @attr ref android.R.styleable#View_longClickable 5610 */ 5611 public void setLongClickable(boolean longClickable) { 5612 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5613 } 5614 5615 /** 5616 * Sets the pressed state for this view. 5617 * 5618 * @see #isClickable() 5619 * @see #setClickable(boolean) 5620 * 5621 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5622 * the View's internal state from a previously set "pressed" state. 5623 */ 5624 public void setPressed(boolean pressed) { 5625 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5626 5627 if (pressed) { 5628 mPrivateFlags |= PRESSED; 5629 } else { 5630 mPrivateFlags &= ~PRESSED; 5631 } 5632 5633 if (needsRefresh) { 5634 refreshDrawableState(); 5635 } 5636 dispatchSetPressed(pressed); 5637 } 5638 5639 /** 5640 * Dispatch setPressed to all of this View's children. 5641 * 5642 * @see #setPressed(boolean) 5643 * 5644 * @param pressed The new pressed state 5645 */ 5646 protected void dispatchSetPressed(boolean pressed) { 5647 } 5648 5649 /** 5650 * Indicates whether the view is currently in pressed state. Unless 5651 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5652 * the pressed state. 5653 * 5654 * @see #setPressed(boolean) 5655 * @see #isClickable() 5656 * @see #setClickable(boolean) 5657 * 5658 * @return true if the view is currently pressed, false otherwise 5659 */ 5660 public boolean isPressed() { 5661 return (mPrivateFlags & PRESSED) == PRESSED; 5662 } 5663 5664 /** 5665 * Indicates whether this view will save its state (that is, 5666 * whether its {@link #onSaveInstanceState} method will be called). 5667 * 5668 * @return Returns true if the view state saving is enabled, else false. 5669 * 5670 * @see #setSaveEnabled(boolean) 5671 * @attr ref android.R.styleable#View_saveEnabled 5672 */ 5673 public boolean isSaveEnabled() { 5674 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5675 } 5676 5677 /** 5678 * Controls whether the saving of this view's state is 5679 * enabled (that is, whether its {@link #onSaveInstanceState} method 5680 * will be called). Note that even if freezing is enabled, the 5681 * view still must have an id assigned to it (via {@link #setId(int)}) 5682 * for its state to be saved. This flag can only disable the 5683 * saving of this view; any child views may still have their state saved. 5684 * 5685 * @param enabled Set to false to <em>disable</em> state saving, or true 5686 * (the default) to allow it. 5687 * 5688 * @see #isSaveEnabled() 5689 * @see #setId(int) 5690 * @see #onSaveInstanceState() 5691 * @attr ref android.R.styleable#View_saveEnabled 5692 */ 5693 public void setSaveEnabled(boolean enabled) { 5694 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5695 } 5696 5697 /** 5698 * Gets whether the framework should discard touches when the view's 5699 * window is obscured by another visible window. 5700 * Refer to the {@link View} security documentation for more details. 5701 * 5702 * @return True if touch filtering is enabled. 5703 * 5704 * @see #setFilterTouchesWhenObscured(boolean) 5705 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5706 */ 5707 @ViewDebug.ExportedProperty 5708 public boolean getFilterTouchesWhenObscured() { 5709 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5710 } 5711 5712 /** 5713 * Sets whether the framework should discard touches when the view's 5714 * window is obscured by another visible window. 5715 * Refer to the {@link View} security documentation for more details. 5716 * 5717 * @param enabled True if touch filtering should be enabled. 5718 * 5719 * @see #getFilterTouchesWhenObscured 5720 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5721 */ 5722 public void setFilterTouchesWhenObscured(boolean enabled) { 5723 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5724 FILTER_TOUCHES_WHEN_OBSCURED); 5725 } 5726 5727 /** 5728 * Indicates whether the entire hierarchy under this view will save its 5729 * state when a state saving traversal occurs from its parent. The default 5730 * is true; if false, these views will not be saved unless 5731 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5732 * 5733 * @return Returns true if the view state saving from parent is enabled, else false. 5734 * 5735 * @see #setSaveFromParentEnabled(boolean) 5736 */ 5737 public boolean isSaveFromParentEnabled() { 5738 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5739 } 5740 5741 /** 5742 * Controls whether the entire hierarchy under this view will save its 5743 * state when a state saving traversal occurs from its parent. The default 5744 * is true; if false, these views will not be saved unless 5745 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5746 * 5747 * @param enabled Set to false to <em>disable</em> state saving, or true 5748 * (the default) to allow it. 5749 * 5750 * @see #isSaveFromParentEnabled() 5751 * @see #setId(int) 5752 * @see #onSaveInstanceState() 5753 */ 5754 public void setSaveFromParentEnabled(boolean enabled) { 5755 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5756 } 5757 5758 5759 /** 5760 * Returns whether this View is able to take focus. 5761 * 5762 * @return True if this view can take focus, or false otherwise. 5763 * @attr ref android.R.styleable#View_focusable 5764 */ 5765 @ViewDebug.ExportedProperty(category = "focus") 5766 public final boolean isFocusable() { 5767 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5768 } 5769 5770 /** 5771 * When a view is focusable, it may not want to take focus when in touch mode. 5772 * For example, a button would like focus when the user is navigating via a D-pad 5773 * so that the user can click on it, but once the user starts touching the screen, 5774 * the button shouldn't take focus 5775 * @return Whether the view is focusable in touch mode. 5776 * @attr ref android.R.styleable#View_focusableInTouchMode 5777 */ 5778 @ViewDebug.ExportedProperty 5779 public final boolean isFocusableInTouchMode() { 5780 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5781 } 5782 5783 /** 5784 * Find the nearest view in the specified direction that can take focus. 5785 * This does not actually give focus to that view. 5786 * 5787 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5788 * 5789 * @return The nearest focusable in the specified direction, or null if none 5790 * can be found. 5791 */ 5792 public View focusSearch(int direction) { 5793 if (mParent != null) { 5794 return mParent.focusSearch(this, direction); 5795 } else { 5796 return null; 5797 } 5798 } 5799 5800 /** 5801 * This method is the last chance for the focused view and its ancestors to 5802 * respond to an arrow key. This is called when the focused view did not 5803 * consume the key internally, nor could the view system find a new view in 5804 * the requested direction to give focus to. 5805 * 5806 * @param focused The currently focused view. 5807 * @param direction The direction focus wants to move. One of FOCUS_UP, 5808 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5809 * @return True if the this view consumed this unhandled move. 5810 */ 5811 public boolean dispatchUnhandledMove(View focused, int direction) { 5812 return false; 5813 } 5814 5815 /** 5816 * If a user manually specified the next view id for a particular direction, 5817 * use the root to look up the view. 5818 * @param root The root view of the hierarchy containing this view. 5819 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5820 * or FOCUS_BACKWARD. 5821 * @return The user specified next view, or null if there is none. 5822 */ 5823 View findUserSetNextFocus(View root, int direction) { 5824 switch (direction) { 5825 case FOCUS_LEFT: 5826 if (mNextFocusLeftId == View.NO_ID) return null; 5827 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5828 case FOCUS_RIGHT: 5829 if (mNextFocusRightId == View.NO_ID) return null; 5830 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5831 case FOCUS_UP: 5832 if (mNextFocusUpId == View.NO_ID) return null; 5833 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5834 case FOCUS_DOWN: 5835 if (mNextFocusDownId == View.NO_ID) return null; 5836 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5837 case FOCUS_FORWARD: 5838 if (mNextFocusForwardId == View.NO_ID) return null; 5839 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5840 case FOCUS_BACKWARD: { 5841 if (mID == View.NO_ID) return null; 5842 final int id = mID; 5843 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5844 @Override 5845 public boolean apply(View t) { 5846 return t.mNextFocusForwardId == id; 5847 } 5848 }); 5849 } 5850 } 5851 return null; 5852 } 5853 5854 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5855 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5856 @Override 5857 public boolean apply(View t) { 5858 return t.mID == childViewId; 5859 } 5860 }); 5861 5862 if (result == null) { 5863 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5864 + "by user for id " + childViewId); 5865 } 5866 return result; 5867 } 5868 5869 /** 5870 * Find and return all focusable views that are descendants of this view, 5871 * possibly including this view if it is focusable itself. 5872 * 5873 * @param direction The direction of the focus 5874 * @return A list of focusable views 5875 */ 5876 public ArrayList<View> getFocusables(int direction) { 5877 ArrayList<View> result = new ArrayList<View>(24); 5878 addFocusables(result, direction); 5879 return result; 5880 } 5881 5882 /** 5883 * Add any focusable views that are descendants of this view (possibly 5884 * including this view if it is focusable itself) to views. If we are in touch mode, 5885 * only add views that are also focusable in touch mode. 5886 * 5887 * @param views Focusable views found so far 5888 * @param direction The direction of the focus 5889 */ 5890 public void addFocusables(ArrayList<View> views, int direction) { 5891 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5892 } 5893 5894 /** 5895 * Adds any focusable views that are descendants of this view (possibly 5896 * including this view if it is focusable itself) to views. This method 5897 * adds all focusable views regardless if we are in touch mode or 5898 * only views focusable in touch mode if we are in touch mode or 5899 * only views that can take accessibility focus if accessibility is enabeld 5900 * depending on the focusable mode paramater. 5901 * 5902 * @param views Focusable views found so far or null if all we are interested is 5903 * the number of focusables. 5904 * @param direction The direction of the focus. 5905 * @param focusableMode The type of focusables to be added. 5906 * 5907 * @see #FOCUSABLES_ALL 5908 * @see #FOCUSABLES_TOUCH_MODE 5909 */ 5910 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5911 if (views == null) { 5912 return; 5913 } 5914 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 5915 if (AccessibilityManager.getInstance(mContext).isEnabled() 5916 && includeForAccessibility()) { 5917 views.add(this); 5918 return; 5919 } 5920 } 5921 if (!isFocusable()) { 5922 return; 5923 } 5924 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 5925 && isInTouchMode() && !isFocusableInTouchMode()) { 5926 return; 5927 } 5928 views.add(this); 5929 } 5930 5931 /** 5932 * Finds the Views that contain given text. The containment is case insensitive. 5933 * The search is performed by either the text that the View renders or the content 5934 * description that describes the view for accessibility purposes and the view does 5935 * not render or both. Clients can specify how the search is to be performed via 5936 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5937 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5938 * 5939 * @param outViews The output list of matching Views. 5940 * @param searched The text to match against. 5941 * 5942 * @see #FIND_VIEWS_WITH_TEXT 5943 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5944 * @see #setContentDescription(CharSequence) 5945 */ 5946 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5947 if (getAccessibilityNodeProvider() != null) { 5948 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5949 outViews.add(this); 5950 } 5951 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5952 && !TextUtils.isEmpty(searched) && !TextUtils.isEmpty(mContentDescription)) { 5953 String searchedLowerCase = searched.toString().toLowerCase(); 5954 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5955 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5956 outViews.add(this); 5957 } 5958 } 5959 } 5960 5961 /** 5962 * Find and return all touchable views that are descendants of this view, 5963 * possibly including this view if it is touchable itself. 5964 * 5965 * @return A list of touchable views 5966 */ 5967 public ArrayList<View> getTouchables() { 5968 ArrayList<View> result = new ArrayList<View>(); 5969 addTouchables(result); 5970 return result; 5971 } 5972 5973 /** 5974 * Add any touchable views that are descendants of this view (possibly 5975 * including this view if it is touchable itself) to views. 5976 * 5977 * @param views Touchable views found so far 5978 */ 5979 public void addTouchables(ArrayList<View> views) { 5980 final int viewFlags = mViewFlags; 5981 5982 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5983 && (viewFlags & ENABLED_MASK) == ENABLED) { 5984 views.add(this); 5985 } 5986 } 5987 5988 /** 5989 * Returns whether this View is accessibility focused. 5990 * 5991 * @return True if this View is accessibility focused. 5992 */ 5993 boolean isAccessibilityFocused() { 5994 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 5995 } 5996 5997 /** 5998 * Call this to try to give accessibility focus to this view. 5999 * 6000 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 6001 * returns false or the view is no visible or the view already has accessibility 6002 * focus. 6003 * 6004 * See also {@link #focusSearch(int)}, which is what you call to say that you 6005 * have focus, and you want your parent to look for the next one. 6006 * 6007 * @return Whether this view actually took accessibility focus. 6008 * 6009 * @hide 6010 */ 6011 public boolean requestAccessibilityFocus() { 6012 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 6013 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 6014 return false; 6015 } 6016 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6017 return false; 6018 } 6019 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6020 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6021 ViewRootImpl viewRootImpl = getViewRootImpl(); 6022 if (viewRootImpl != null) { 6023 viewRootImpl.setAccessibilityFocusedHost(this); 6024 } 6025 invalidate(); 6026 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6027 notifyAccessibilityStateChanged(); 6028 // Try to give input focus to this view - not a descendant. 6029 requestFocusNoSearch(View.FOCUS_DOWN, null); 6030 return true; 6031 } 6032 return false; 6033 } 6034 6035 /** 6036 * Call this to try to clear accessibility focus of this view. 6037 * 6038 * See also {@link #focusSearch(int)}, which is what you call to say that you 6039 * have focus, and you want your parent to look for the next one. 6040 * 6041 * @hide 6042 */ 6043 public void clearAccessibilityFocus() { 6044 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6045 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6046 ViewRootImpl viewRootImpl = getViewRootImpl(); 6047 if (viewRootImpl != null) { 6048 viewRootImpl.setAccessibilityFocusedHost(null); 6049 } 6050 invalidate(); 6051 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6052 notifyAccessibilityStateChanged(); 6053 // Try to move accessibility focus to the input focus. 6054 View rootView = getRootView(); 6055 if (rootView != null) { 6056 View inputFocus = rootView.findFocus(); 6057 if (inputFocus != null) { 6058 inputFocus.requestAccessibilityFocus(); 6059 } 6060 } 6061 } 6062 } 6063 6064 /** 6065 * Find the best view to take accessibility focus from a hover. 6066 * This function finds the deepest actionable view and if that 6067 * fails ask the parent to take accessibility focus from hover. 6068 * 6069 * @param x The X hovered location in this view coorditantes. 6070 * @param y The Y hovered location in this view coorditantes. 6071 * @return Whether the request was handled. 6072 * 6073 * @hide 6074 */ 6075 public boolean requestAccessibilityFocusFromHover(float x, float y) { 6076 if (onRequestAccessibilityFocusFromHover(x, y)) { 6077 return true; 6078 } 6079 ViewParent parent = mParent; 6080 if (parent instanceof View) { 6081 View parentView = (View) parent; 6082 6083 float[] position = mAttachInfo.mTmpTransformLocation; 6084 position[0] = x; 6085 position[1] = y; 6086 6087 // Compensate for the transformation of the current matrix. 6088 if (!hasIdentityMatrix()) { 6089 getMatrix().mapPoints(position); 6090 } 6091 6092 // Compensate for the parent scroll and the offset 6093 // of this view stop from the parent top. 6094 position[0] += mLeft - parentView.mScrollX; 6095 position[1] += mTop - parentView.mScrollY; 6096 6097 return parentView.requestAccessibilityFocusFromHover(position[0], position[1]); 6098 } 6099 return false; 6100 } 6101 6102 /** 6103 * Requests to give this View focus from hover. 6104 * 6105 * @param x The X hovered location in this view coorditantes. 6106 * @param y The Y hovered location in this view coorditantes. 6107 * @return Whether the request was handled. 6108 * 6109 * @hide 6110 */ 6111 public boolean onRequestAccessibilityFocusFromHover(float x, float y) { 6112 if (includeForAccessibility() 6113 && (isActionableForAccessibility() || hasListenersForAccessibility())) { 6114 return requestAccessibilityFocus(); 6115 } 6116 return false; 6117 } 6118 6119 /** 6120 * Clears accessibility focus without calling any callback methods 6121 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6122 * is used for clearing accessibility focus when giving this focus to 6123 * another view. 6124 */ 6125 void clearAccessibilityFocusNoCallbacks() { 6126 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6127 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6128 invalidate(); 6129 } 6130 } 6131 6132 /** 6133 * Call this to try to give focus to a specific view or to one of its 6134 * descendants. 6135 * 6136 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6137 * false), or if it is focusable and it is not focusable in touch mode 6138 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6139 * 6140 * See also {@link #focusSearch(int)}, which is what you call to say that you 6141 * have focus, and you want your parent to look for the next one. 6142 * 6143 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6144 * {@link #FOCUS_DOWN} and <code>null</code>. 6145 * 6146 * @return Whether this view or one of its descendants actually took focus. 6147 */ 6148 public final boolean requestFocus() { 6149 return requestFocus(View.FOCUS_DOWN); 6150 } 6151 6152 /** 6153 * Call this to try to give focus to a specific view or to one of its 6154 * descendants and give it a hint about what direction focus is heading. 6155 * 6156 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6157 * false), or if it is focusable and it is not focusable in touch mode 6158 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6159 * 6160 * See also {@link #focusSearch(int)}, which is what you call to say that you 6161 * have focus, and you want your parent to look for the next one. 6162 * 6163 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 6164 * <code>null</code> set for the previously focused rectangle. 6165 * 6166 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6167 * @return Whether this view or one of its descendants actually took focus. 6168 */ 6169 public final boolean requestFocus(int direction) { 6170 return requestFocus(direction, null); 6171 } 6172 6173 /** 6174 * Call this to try to give focus to a specific view or to one of its descendants 6175 * and give it hints about the direction and a specific rectangle that the focus 6176 * is coming from. The rectangle can help give larger views a finer grained hint 6177 * about where focus is coming from, and therefore, where to show selection, or 6178 * forward focus change internally. 6179 * 6180 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6181 * false), or if it is focusable and it is not focusable in touch mode 6182 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6183 * 6184 * A View will not take focus if it is not visible. 6185 * 6186 * A View will not take focus if one of its parents has 6187 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6188 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6189 * 6190 * See also {@link #focusSearch(int)}, which is what you call to say that you 6191 * have focus, and you want your parent to look for the next one. 6192 * 6193 * You may wish to override this method if your custom {@link View} has an internal 6194 * {@link View} that it wishes to forward the request to. 6195 * 6196 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6197 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6198 * to give a finer grained hint about where focus is coming from. May be null 6199 * if there is no hint. 6200 * @return Whether this view or one of its descendants actually took focus. 6201 */ 6202 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6203 return requestFocusNoSearch(direction, previouslyFocusedRect); 6204 } 6205 6206 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6207 // need to be focusable 6208 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6209 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6210 return false; 6211 } 6212 6213 // need to be focusable in touch mode if in touch mode 6214 if (isInTouchMode() && 6215 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6216 return false; 6217 } 6218 6219 // need to not have any parents blocking us 6220 if (hasAncestorThatBlocksDescendantFocus()) { 6221 return false; 6222 } 6223 6224 handleFocusGainInternal(direction, previouslyFocusedRect); 6225 return true; 6226 } 6227 6228 /** 6229 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6230 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6231 * touch mode to request focus when they are touched. 6232 * 6233 * @return Whether this view or one of its descendants actually took focus. 6234 * 6235 * @see #isInTouchMode() 6236 * 6237 */ 6238 public final boolean requestFocusFromTouch() { 6239 // Leave touch mode if we need to 6240 if (isInTouchMode()) { 6241 ViewRootImpl viewRoot = getViewRootImpl(); 6242 if (viewRoot != null) { 6243 viewRoot.ensureTouchMode(false); 6244 } 6245 } 6246 return requestFocus(View.FOCUS_DOWN); 6247 } 6248 6249 /** 6250 * @return Whether any ancestor of this view blocks descendant focus. 6251 */ 6252 private boolean hasAncestorThatBlocksDescendantFocus() { 6253 ViewParent ancestor = mParent; 6254 while (ancestor instanceof ViewGroup) { 6255 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6256 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6257 return true; 6258 } else { 6259 ancestor = vgAncestor.getParent(); 6260 } 6261 } 6262 return false; 6263 } 6264 6265 /** 6266 * Gets the mode for determining whether this View is important for accessibility 6267 * which is if it fires accessibility events and if it is reported to 6268 * accessibility services that query the screen. 6269 * 6270 * @return The mode for determining whether a View is important for accessibility. 6271 * 6272 * @attr ref android.R.styleable#View_importantForAccessibility 6273 * 6274 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6275 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6276 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6277 */ 6278 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6279 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6280 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6281 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6282 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6283 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6284 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6285 }) 6286 public int getImportantForAccessibility() { 6287 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6288 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6289 } 6290 6291 /** 6292 * Sets how to determine whether this view is important for accessibility 6293 * which is if it fires accessibility events and if it is reported to 6294 * accessibility services that query the screen. 6295 * 6296 * @param mode How to determine whether this view is important for accessibility. 6297 * 6298 * @attr ref android.R.styleable#View_importantForAccessibility 6299 * 6300 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6301 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6302 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6303 */ 6304 public void setImportantForAccessibility(int mode) { 6305 if (mode != getImportantForAccessibility()) { 6306 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6307 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6308 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6309 notifyAccessibilityStateChanged(); 6310 } 6311 } 6312 6313 /** 6314 * Gets whether this view should be exposed for accessibility. 6315 * 6316 * @return Whether the view is exposed for accessibility. 6317 * 6318 * @hide 6319 */ 6320 public boolean isImportantForAccessibility() { 6321 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6322 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6323 switch (mode) { 6324 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6325 return true; 6326 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6327 return false; 6328 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6329 return isActionableForAccessibility() || hasListenersForAccessibility(); 6330 default: 6331 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6332 + mode); 6333 } 6334 } 6335 6336 /** 6337 * Gets the parent for accessibility purposes. Note that the parent for 6338 * accessibility is not necessary the immediate parent. It is the first 6339 * predecessor that is important for accessibility. 6340 * 6341 * @return The parent for accessibility purposes. 6342 */ 6343 public ViewParent getParentForAccessibility() { 6344 if (mParent instanceof View) { 6345 View parentView = (View) mParent; 6346 if (parentView.includeForAccessibility()) { 6347 return mParent; 6348 } else { 6349 return mParent.getParentForAccessibility(); 6350 } 6351 } 6352 return null; 6353 } 6354 6355 /** 6356 * Adds the children of a given View for accessibility. Since some Views are 6357 * not important for accessibility the children for accessibility are not 6358 * necessarily direct children of the riew, rather they are the first level of 6359 * descendants important for accessibility. 6360 * 6361 * @param children The list of children for accessibility. 6362 */ 6363 public void addChildrenForAccessibility(ArrayList<View> children) { 6364 if (includeForAccessibility()) { 6365 children.add(this); 6366 } 6367 } 6368 6369 /** 6370 * Whether to regard this view for accessibility. A view is regarded for 6371 * accessibility if it is important for accessibility or the querying 6372 * accessibility service has explicitly requested that view not 6373 * important for accessibility are regarded. 6374 * 6375 * @return Whether to regard the view for accessibility. 6376 */ 6377 boolean includeForAccessibility() { 6378 if (mAttachInfo != null) { 6379 if (!mAttachInfo.mIncludeNotImportantViews) { 6380 return isImportantForAccessibility() && isDisplayedOnScreen(); 6381 } else { 6382 return isDisplayedOnScreen(); 6383 } 6384 } 6385 return false; 6386 } 6387 6388 /** 6389 * Returns whether the View is considered actionable from 6390 * accessibility perspective. Such view are important for 6391 * accessiiblity. 6392 * 6393 * @return True if the view is actionable for accessibility. 6394 */ 6395 private boolean isActionableForAccessibility() { 6396 return (isClickable() || isLongClickable() || isFocusable()); 6397 } 6398 6399 /** 6400 * Returns whether the View has registered callbacks wich makes it 6401 * important for accessiiblity. 6402 * 6403 * @return True if the view is actionable for accessibility. 6404 */ 6405 private boolean hasListenersForAccessibility() { 6406 ListenerInfo info = getListenerInfo(); 6407 return mTouchDelegate != null || info.mOnKeyListener != null 6408 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6409 || info.mOnHoverListener != null || info.mOnDragListener != null; 6410 } 6411 6412 /** 6413 * Notifies accessibility services that some view's important for 6414 * accessibility state has changed. Note that such notifications 6415 * are made at most once every 6416 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6417 * to avoid unnecessary load to the system. Also once a view has 6418 * made a notifucation this method is a NOP until the notification has 6419 * been sent to clients. 6420 * 6421 * @hide 6422 * 6423 * TODO: Makse sure this method is called for any view state change 6424 * that is interesting for accessilility purposes. 6425 */ 6426 public void notifyAccessibilityStateChanged() { 6427 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6428 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6429 if (mParent != null) { 6430 mParent.childAccessibilityStateChanged(this); 6431 } 6432 } 6433 } 6434 6435 /** 6436 * Reset the state indicating the this view has requested clients 6437 * interested in its accessiblity state to be notified. 6438 * 6439 * @hide 6440 */ 6441 public void resetAccessibilityStateChanged() { 6442 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6443 } 6444 6445 /** 6446 * Performs the specified accessibility action on the view. For 6447 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6448 * 6449 * @param action The action to perform. 6450 * @return Whether the action was performed. 6451 */ 6452 public boolean performAccessibilityAction(int action, Bundle args) { 6453 switch (action) { 6454 case AccessibilityNodeInfo.ACTION_CLICK: { 6455 if (isClickable()) { 6456 performClick(); 6457 } 6458 } break; 6459 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6460 if (isLongClickable()) { 6461 performLongClick(); 6462 } 6463 } break; 6464 case AccessibilityNodeInfo.ACTION_FOCUS: { 6465 if (!hasFocus()) { 6466 // Get out of touch mode since accessibility 6467 // wants to move focus around. 6468 getViewRootImpl().ensureTouchMode(false); 6469 return requestFocus(); 6470 } 6471 } break; 6472 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6473 if (hasFocus()) { 6474 clearFocus(); 6475 return !isFocused(); 6476 } 6477 } break; 6478 case AccessibilityNodeInfo.ACTION_SELECT: { 6479 if (!isSelected()) { 6480 setSelected(true); 6481 return isSelected(); 6482 } 6483 } break; 6484 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6485 if (isSelected()) { 6486 setSelected(false); 6487 return !isSelected(); 6488 } 6489 } break; 6490 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6491 if (!isAccessibilityFocused()) { 6492 return requestAccessibilityFocus(); 6493 } 6494 } break; 6495 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6496 if (isAccessibilityFocused()) { 6497 clearAccessibilityFocus(); 6498 return true; 6499 } 6500 } break; 6501 } 6502 return false; 6503 } 6504 6505 /** 6506 * @hide 6507 */ 6508 public void dispatchStartTemporaryDetach() { 6509 onStartTemporaryDetach(); 6510 } 6511 6512 /** 6513 * This is called when a container is going to temporarily detach a child, with 6514 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6515 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6516 * {@link #onDetachedFromWindow()} when the container is done. 6517 */ 6518 public void onStartTemporaryDetach() { 6519 removeUnsetPressCallback(); 6520 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6521 } 6522 6523 /** 6524 * @hide 6525 */ 6526 public void dispatchFinishTemporaryDetach() { 6527 onFinishTemporaryDetach(); 6528 } 6529 6530 /** 6531 * Called after {@link #onStartTemporaryDetach} when the container is done 6532 * changing the view. 6533 */ 6534 public void onFinishTemporaryDetach() { 6535 } 6536 6537 /** 6538 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6539 * for this view's window. Returns null if the view is not currently attached 6540 * to the window. Normally you will not need to use this directly, but 6541 * just use the standard high-level event callbacks like 6542 * {@link #onKeyDown(int, KeyEvent)}. 6543 */ 6544 public KeyEvent.DispatcherState getKeyDispatcherState() { 6545 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6546 } 6547 6548 /** 6549 * Dispatch a key event before it is processed by any input method 6550 * associated with the view hierarchy. This can be used to intercept 6551 * key events in special situations before the IME consumes them; a 6552 * typical example would be handling the BACK key to update the application's 6553 * UI instead of allowing the IME to see it and close itself. 6554 * 6555 * @param event The key event to be dispatched. 6556 * @return True if the event was handled, false otherwise. 6557 */ 6558 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6559 return onKeyPreIme(event.getKeyCode(), event); 6560 } 6561 6562 /** 6563 * Dispatch a key event to the next view on the focus path. This path runs 6564 * from the top of the view tree down to the currently focused view. If this 6565 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6566 * the next node down the focus path. This method also fires any key 6567 * listeners. 6568 * 6569 * @param event The key event to be dispatched. 6570 * @return True if the event was handled, false otherwise. 6571 */ 6572 public boolean dispatchKeyEvent(KeyEvent event) { 6573 if (mInputEventConsistencyVerifier != null) { 6574 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6575 } 6576 6577 // Give any attached key listener a first crack at the event. 6578 //noinspection SimplifiableIfStatement 6579 ListenerInfo li = mListenerInfo; 6580 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6581 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6582 return true; 6583 } 6584 6585 if (event.dispatch(this, mAttachInfo != null 6586 ? mAttachInfo.mKeyDispatchState : null, this)) { 6587 return true; 6588 } 6589 6590 if (mInputEventConsistencyVerifier != null) { 6591 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6592 } 6593 return false; 6594 } 6595 6596 /** 6597 * Dispatches a key shortcut event. 6598 * 6599 * @param event The key event to be dispatched. 6600 * @return True if the event was handled by the view, false otherwise. 6601 */ 6602 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6603 return onKeyShortcut(event.getKeyCode(), event); 6604 } 6605 6606 /** 6607 * Pass the touch screen motion event down to the target view, or this 6608 * view if it is the target. 6609 * 6610 * @param event The motion event to be dispatched. 6611 * @return True if the event was handled by the view, false otherwise. 6612 */ 6613 public boolean dispatchTouchEvent(MotionEvent event) { 6614 if (mInputEventConsistencyVerifier != null) { 6615 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6616 } 6617 6618 if (onFilterTouchEventForSecurity(event)) { 6619 //noinspection SimplifiableIfStatement 6620 ListenerInfo li = mListenerInfo; 6621 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6622 && li.mOnTouchListener.onTouch(this, event)) { 6623 return true; 6624 } 6625 6626 if (onTouchEvent(event)) { 6627 return true; 6628 } 6629 } 6630 6631 if (mInputEventConsistencyVerifier != null) { 6632 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6633 } 6634 return false; 6635 } 6636 6637 /** 6638 * Filter the touch event to apply security policies. 6639 * 6640 * @param event The motion event to be filtered. 6641 * @return True if the event should be dispatched, false if the event should be dropped. 6642 * 6643 * @see #getFilterTouchesWhenObscured 6644 */ 6645 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6646 //noinspection RedundantIfStatement 6647 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6648 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6649 // Window is obscured, drop this touch. 6650 return false; 6651 } 6652 return true; 6653 } 6654 6655 /** 6656 * Pass a trackball motion event down to the focused view. 6657 * 6658 * @param event The motion event to be dispatched. 6659 * @return True if the event was handled by the view, false otherwise. 6660 */ 6661 public boolean dispatchTrackballEvent(MotionEvent event) { 6662 if (mInputEventConsistencyVerifier != null) { 6663 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6664 } 6665 6666 return onTrackballEvent(event); 6667 } 6668 6669 /** 6670 * Dispatch a generic motion event. 6671 * <p> 6672 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6673 * are delivered to the view under the pointer. All other generic motion events are 6674 * delivered to the focused view. Hover events are handled specially and are delivered 6675 * to {@link #onHoverEvent(MotionEvent)}. 6676 * </p> 6677 * 6678 * @param event The motion event to be dispatched. 6679 * @return True if the event was handled by the view, false otherwise. 6680 */ 6681 public boolean dispatchGenericMotionEvent(MotionEvent event) { 6682 if (mInputEventConsistencyVerifier != null) { 6683 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6684 } 6685 6686 final int source = event.getSource(); 6687 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6688 final int action = event.getAction(); 6689 if (action == MotionEvent.ACTION_HOVER_ENTER 6690 || action == MotionEvent.ACTION_HOVER_MOVE 6691 || action == MotionEvent.ACTION_HOVER_EXIT) { 6692 if (dispatchHoverEvent(event)) { 6693 return true; 6694 } 6695 } else if (dispatchGenericPointerEvent(event)) { 6696 return true; 6697 } 6698 } else if (dispatchGenericFocusedEvent(event)) { 6699 return true; 6700 } 6701 6702 if (dispatchGenericMotionEventInternal(event)) { 6703 return true; 6704 } 6705 6706 if (mInputEventConsistencyVerifier != null) { 6707 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6708 } 6709 return false; 6710 } 6711 6712 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6713 //noinspection SimplifiableIfStatement 6714 ListenerInfo li = mListenerInfo; 6715 if (li != null && li.mOnGenericMotionListener != null 6716 && (mViewFlags & ENABLED_MASK) == ENABLED 6717 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6718 return true; 6719 } 6720 6721 if (onGenericMotionEvent(event)) { 6722 return true; 6723 } 6724 6725 if (mInputEventConsistencyVerifier != null) { 6726 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6727 } 6728 return false; 6729 } 6730 6731 /** 6732 * Dispatch a hover event. 6733 * <p> 6734 * Do not call this method directly. 6735 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6736 * </p> 6737 * 6738 * @param event The motion event to be dispatched. 6739 * @return True if the event was handled by the view, false otherwise. 6740 */ 6741 protected boolean dispatchHoverEvent(MotionEvent event) { 6742 //noinspection SimplifiableIfStatement 6743 ListenerInfo li = mListenerInfo; 6744 if (li != null && li.mOnHoverListener != null 6745 && (mViewFlags & ENABLED_MASK) == ENABLED 6746 && li.mOnHoverListener.onHover(this, event)) { 6747 return true; 6748 } 6749 6750 return onHoverEvent(event); 6751 } 6752 6753 /** 6754 * Returns true if the view has a child to which it has recently sent 6755 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 6756 * it does not have a hovered child, then it must be the innermost hovered view. 6757 * @hide 6758 */ 6759 protected boolean hasHoveredChild() { 6760 return false; 6761 } 6762 6763 /** 6764 * Dispatch a generic motion event to the view under the first pointer. 6765 * <p> 6766 * Do not call this method directly. 6767 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6768 * </p> 6769 * 6770 * @param event The motion event to be dispatched. 6771 * @return True if the event was handled by the view, false otherwise. 6772 */ 6773 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 6774 return false; 6775 } 6776 6777 /** 6778 * Dispatch a generic motion event to the currently focused view. 6779 * <p> 6780 * Do not call this method directly. 6781 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6782 * </p> 6783 * 6784 * @param event The motion event to be dispatched. 6785 * @return True if the event was handled by the view, false otherwise. 6786 */ 6787 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 6788 return false; 6789 } 6790 6791 /** 6792 * Dispatch a pointer event. 6793 * <p> 6794 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 6795 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 6796 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 6797 * and should not be expected to handle other pointing device features. 6798 * </p> 6799 * 6800 * @param event The motion event to be dispatched. 6801 * @return True if the event was handled by the view, false otherwise. 6802 * @hide 6803 */ 6804 public final boolean dispatchPointerEvent(MotionEvent event) { 6805 if (event.isTouchEvent()) { 6806 return dispatchTouchEvent(event); 6807 } else { 6808 return dispatchGenericMotionEvent(event); 6809 } 6810 } 6811 6812 /** 6813 * Called when the window containing this view gains or loses window focus. 6814 * ViewGroups should override to route to their children. 6815 * 6816 * @param hasFocus True if the window containing this view now has focus, 6817 * false otherwise. 6818 */ 6819 public void dispatchWindowFocusChanged(boolean hasFocus) { 6820 onWindowFocusChanged(hasFocus); 6821 } 6822 6823 /** 6824 * Called when the window containing this view gains or loses focus. Note 6825 * that this is separate from view focus: to receive key events, both 6826 * your view and its window must have focus. If a window is displayed 6827 * on top of yours that takes input focus, then your own window will lose 6828 * focus but the view focus will remain unchanged. 6829 * 6830 * @param hasWindowFocus True if the window containing this view now has 6831 * focus, false otherwise. 6832 */ 6833 public void onWindowFocusChanged(boolean hasWindowFocus) { 6834 InputMethodManager imm = InputMethodManager.peekInstance(); 6835 if (!hasWindowFocus) { 6836 if (isPressed()) { 6837 setPressed(false); 6838 } 6839 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 6840 imm.focusOut(this); 6841 } 6842 removeLongPressCallback(); 6843 removeTapCallback(); 6844 onFocusLost(); 6845 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 6846 imm.focusIn(this); 6847 } 6848 refreshDrawableState(); 6849 } 6850 6851 /** 6852 * Returns true if this view is in a window that currently has window focus. 6853 * Note that this is not the same as the view itself having focus. 6854 * 6855 * @return True if this view is in a window that currently has window focus. 6856 */ 6857 public boolean hasWindowFocus() { 6858 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 6859 } 6860 6861 /** 6862 * Dispatch a view visibility change down the view hierarchy. 6863 * ViewGroups should override to route to their children. 6864 * @param changedView The view whose visibility changed. Could be 'this' or 6865 * an ancestor view. 6866 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 6867 * {@link #INVISIBLE} or {@link #GONE}. 6868 */ 6869 protected void dispatchVisibilityChanged(View changedView, int visibility) { 6870 onVisibilityChanged(changedView, visibility); 6871 } 6872 6873 /** 6874 * Called when the visibility of the view or an ancestor of the view is changed. 6875 * @param changedView The view whose visibility changed. Could be 'this' or 6876 * an ancestor view. 6877 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 6878 * {@link #INVISIBLE} or {@link #GONE}. 6879 */ 6880 protected void onVisibilityChanged(View changedView, int visibility) { 6881 if (visibility == VISIBLE) { 6882 if (mAttachInfo != null) { 6883 initialAwakenScrollBars(); 6884 } else { 6885 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 6886 } 6887 } 6888 } 6889 6890 /** 6891 * Dispatch a hint about whether this view is displayed. For instance, when 6892 * a View moves out of the screen, it might receives a display hint indicating 6893 * the view is not displayed. Applications should not <em>rely</em> on this hint 6894 * as there is no guarantee that they will receive one. 6895 * 6896 * @param hint A hint about whether or not this view is displayed: 6897 * {@link #VISIBLE} or {@link #INVISIBLE}. 6898 */ 6899 public void dispatchDisplayHint(int hint) { 6900 onDisplayHint(hint); 6901 } 6902 6903 /** 6904 * Gives this view a hint about whether is displayed or not. For instance, when 6905 * a View moves out of the screen, it might receives a display hint indicating 6906 * the view is not displayed. Applications should not <em>rely</em> on this hint 6907 * as there is no guarantee that they will receive one. 6908 * 6909 * @param hint A hint about whether or not this view is displayed: 6910 * {@link #VISIBLE} or {@link #INVISIBLE}. 6911 */ 6912 protected void onDisplayHint(int hint) { 6913 } 6914 6915 /** 6916 * Dispatch a window visibility change down the view hierarchy. 6917 * ViewGroups should override to route to their children. 6918 * 6919 * @param visibility The new visibility of the window. 6920 * 6921 * @see #onWindowVisibilityChanged(int) 6922 */ 6923 public void dispatchWindowVisibilityChanged(int visibility) { 6924 onWindowVisibilityChanged(visibility); 6925 } 6926 6927 /** 6928 * Called when the window containing has change its visibility 6929 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 6930 * that this tells you whether or not your window is being made visible 6931 * to the window manager; this does <em>not</em> tell you whether or not 6932 * your window is obscured by other windows on the screen, even if it 6933 * is itself visible. 6934 * 6935 * @param visibility The new visibility of the window. 6936 */ 6937 protected void onWindowVisibilityChanged(int visibility) { 6938 if (visibility == VISIBLE) { 6939 initialAwakenScrollBars(); 6940 } 6941 } 6942 6943 /** 6944 * Returns the current visibility of the window this view is attached to 6945 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 6946 * 6947 * @return Returns the current visibility of the view's window. 6948 */ 6949 public int getWindowVisibility() { 6950 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 6951 } 6952 6953 /** 6954 * Retrieve the overall visible display size in which the window this view is 6955 * attached to has been positioned in. This takes into account screen 6956 * decorations above the window, for both cases where the window itself 6957 * is being position inside of them or the window is being placed under 6958 * then and covered insets are used for the window to position its content 6959 * inside. In effect, this tells you the available area where content can 6960 * be placed and remain visible to users. 6961 * 6962 * <p>This function requires an IPC back to the window manager to retrieve 6963 * the requested information, so should not be used in performance critical 6964 * code like drawing. 6965 * 6966 * @param outRect Filled in with the visible display frame. If the view 6967 * is not attached to a window, this is simply the raw display size. 6968 */ 6969 public void getWindowVisibleDisplayFrame(Rect outRect) { 6970 if (mAttachInfo != null) { 6971 try { 6972 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 6973 } catch (RemoteException e) { 6974 return; 6975 } 6976 // XXX This is really broken, and probably all needs to be done 6977 // in the window manager, and we need to know more about whether 6978 // we want the area behind or in front of the IME. 6979 final Rect insets = mAttachInfo.mVisibleInsets; 6980 outRect.left += insets.left; 6981 outRect.top += insets.top; 6982 outRect.right -= insets.right; 6983 outRect.bottom -= insets.bottom; 6984 return; 6985 } 6986 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 6987 d.getRectSize(outRect); 6988 } 6989 6990 /** 6991 * Dispatch a notification about a resource configuration change down 6992 * the view hierarchy. 6993 * ViewGroups should override to route to their children. 6994 * 6995 * @param newConfig The new resource configuration. 6996 * 6997 * @see #onConfigurationChanged(android.content.res.Configuration) 6998 */ 6999 public void dispatchConfigurationChanged(Configuration newConfig) { 7000 onConfigurationChanged(newConfig); 7001 } 7002 7003 /** 7004 * Called when the current configuration of the resources being used 7005 * by the application have changed. You can use this to decide when 7006 * to reload resources that can changed based on orientation and other 7007 * configuration characterstics. You only need to use this if you are 7008 * not relying on the normal {@link android.app.Activity} mechanism of 7009 * recreating the activity instance upon a configuration change. 7010 * 7011 * @param newConfig The new resource configuration. 7012 */ 7013 protected void onConfigurationChanged(Configuration newConfig) { 7014 } 7015 7016 /** 7017 * Private function to aggregate all per-view attributes in to the view 7018 * root. 7019 */ 7020 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7021 performCollectViewAttributes(attachInfo, visibility); 7022 } 7023 7024 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7025 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7026 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7027 attachInfo.mKeepScreenOn = true; 7028 } 7029 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7030 ListenerInfo li = mListenerInfo; 7031 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7032 attachInfo.mHasSystemUiListeners = true; 7033 } 7034 } 7035 } 7036 7037 void needGlobalAttributesUpdate(boolean force) { 7038 final AttachInfo ai = mAttachInfo; 7039 if (ai != null) { 7040 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7041 || ai.mHasSystemUiListeners) { 7042 ai.mRecomputeGlobalAttributes = true; 7043 } 7044 } 7045 } 7046 7047 /** 7048 * Returns whether the device is currently in touch mode. Touch mode is entered 7049 * once the user begins interacting with the device by touch, and affects various 7050 * things like whether focus is always visible to the user. 7051 * 7052 * @return Whether the device is in touch mode. 7053 */ 7054 @ViewDebug.ExportedProperty 7055 public boolean isInTouchMode() { 7056 if (mAttachInfo != null) { 7057 return mAttachInfo.mInTouchMode; 7058 } else { 7059 return ViewRootImpl.isInTouchMode(); 7060 } 7061 } 7062 7063 /** 7064 * Returns the context the view is running in, through which it can 7065 * access the current theme, resources, etc. 7066 * 7067 * @return The view's Context. 7068 */ 7069 @ViewDebug.CapturedViewProperty 7070 public final Context getContext() { 7071 return mContext; 7072 } 7073 7074 /** 7075 * Handle a key event before it is processed by any input method 7076 * associated with the view hierarchy. This can be used to intercept 7077 * key events in special situations before the IME consumes them; a 7078 * typical example would be handling the BACK key to update the application's 7079 * UI instead of allowing the IME to see it and close itself. 7080 * 7081 * @param keyCode The value in event.getKeyCode(). 7082 * @param event Description of the key event. 7083 * @return If you handled the event, return true. If you want to allow the 7084 * event to be handled by the next receiver, return false. 7085 */ 7086 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7087 return false; 7088 } 7089 7090 /** 7091 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7092 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7093 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7094 * is released, if the view is enabled and clickable. 7095 * 7096 * @param keyCode A key code that represents the button pressed, from 7097 * {@link android.view.KeyEvent}. 7098 * @param event The KeyEvent object that defines the button action. 7099 */ 7100 public boolean onKeyDown(int keyCode, KeyEvent event) { 7101 boolean result = false; 7102 7103 switch (keyCode) { 7104 case KeyEvent.KEYCODE_DPAD_CENTER: 7105 case KeyEvent.KEYCODE_ENTER: { 7106 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7107 return true; 7108 } 7109 // Long clickable items don't necessarily have to be clickable 7110 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7111 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7112 (event.getRepeatCount() == 0)) { 7113 setPressed(true); 7114 checkForLongClick(0); 7115 return true; 7116 } 7117 break; 7118 } 7119 } 7120 return result; 7121 } 7122 7123 /** 7124 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7125 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7126 * the event). 7127 */ 7128 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7129 return false; 7130 } 7131 7132 /** 7133 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7134 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7135 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7136 * {@link KeyEvent#KEYCODE_ENTER} is released. 7137 * 7138 * @param keyCode A key code that represents the button pressed, from 7139 * {@link android.view.KeyEvent}. 7140 * @param event The KeyEvent object that defines the button action. 7141 */ 7142 public boolean onKeyUp(int keyCode, KeyEvent event) { 7143 boolean result = false; 7144 7145 switch (keyCode) { 7146 case KeyEvent.KEYCODE_DPAD_CENTER: 7147 case KeyEvent.KEYCODE_ENTER: { 7148 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7149 return true; 7150 } 7151 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7152 setPressed(false); 7153 7154 if (!mHasPerformedLongPress) { 7155 // This is a tap, so remove the longpress check 7156 removeLongPressCallback(); 7157 7158 result = performClick(); 7159 } 7160 } 7161 break; 7162 } 7163 } 7164 return result; 7165 } 7166 7167 /** 7168 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7169 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7170 * the event). 7171 * 7172 * @param keyCode A key code that represents the button pressed, from 7173 * {@link android.view.KeyEvent}. 7174 * @param repeatCount The number of times the action was made. 7175 * @param event The KeyEvent object that defines the button action. 7176 */ 7177 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7178 return false; 7179 } 7180 7181 /** 7182 * Called on the focused view when a key shortcut event is not handled. 7183 * Override this method to implement local key shortcuts for the View. 7184 * Key shortcuts can also be implemented by setting the 7185 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7186 * 7187 * @param keyCode The value in event.getKeyCode(). 7188 * @param event Description of the key event. 7189 * @return If you handled the event, return true. If you want to allow the 7190 * event to be handled by the next receiver, return false. 7191 */ 7192 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7193 return false; 7194 } 7195 7196 /** 7197 * Check whether the called view is a text editor, in which case it 7198 * would make sense to automatically display a soft input window for 7199 * it. Subclasses should override this if they implement 7200 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7201 * a call on that method would return a non-null InputConnection, and 7202 * they are really a first-class editor that the user would normally 7203 * start typing on when the go into a window containing your view. 7204 * 7205 * <p>The default implementation always returns false. This does 7206 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7207 * will not be called or the user can not otherwise perform edits on your 7208 * view; it is just a hint to the system that this is not the primary 7209 * purpose of this view. 7210 * 7211 * @return Returns true if this view is a text editor, else false. 7212 */ 7213 public boolean onCheckIsTextEditor() { 7214 return false; 7215 } 7216 7217 /** 7218 * Create a new InputConnection for an InputMethod to interact 7219 * with the view. The default implementation returns null, since it doesn't 7220 * support input methods. You can override this to implement such support. 7221 * This is only needed for views that take focus and text input. 7222 * 7223 * <p>When implementing this, you probably also want to implement 7224 * {@link #onCheckIsTextEditor()} to indicate you will return a 7225 * non-null InputConnection. 7226 * 7227 * @param outAttrs Fill in with attribute information about the connection. 7228 */ 7229 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7230 return null; 7231 } 7232 7233 /** 7234 * Called by the {@link android.view.inputmethod.InputMethodManager} 7235 * when a view who is not the current 7236 * input connection target is trying to make a call on the manager. The 7237 * default implementation returns false; you can override this to return 7238 * true for certain views if you are performing InputConnection proxying 7239 * to them. 7240 * @param view The View that is making the InputMethodManager call. 7241 * @return Return true to allow the call, false to reject. 7242 */ 7243 public boolean checkInputConnectionProxy(View view) { 7244 return false; 7245 } 7246 7247 /** 7248 * Show the context menu for this view. It is not safe to hold on to the 7249 * menu after returning from this method. 7250 * 7251 * You should normally not overload this method. Overload 7252 * {@link #onCreateContextMenu(ContextMenu)} or define an 7253 * {@link OnCreateContextMenuListener} to add items to the context menu. 7254 * 7255 * @param menu The context menu to populate 7256 */ 7257 public void createContextMenu(ContextMenu menu) { 7258 ContextMenuInfo menuInfo = getContextMenuInfo(); 7259 7260 // Sets the current menu info so all items added to menu will have 7261 // my extra info set. 7262 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7263 7264 onCreateContextMenu(menu); 7265 ListenerInfo li = mListenerInfo; 7266 if (li != null && li.mOnCreateContextMenuListener != null) { 7267 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7268 } 7269 7270 // Clear the extra information so subsequent items that aren't mine don't 7271 // have my extra info. 7272 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7273 7274 if (mParent != null) { 7275 mParent.createContextMenu(menu); 7276 } 7277 } 7278 7279 /** 7280 * Views should implement this if they have extra information to associate 7281 * with the context menu. The return result is supplied as a parameter to 7282 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7283 * callback. 7284 * 7285 * @return Extra information about the item for which the context menu 7286 * should be shown. This information will vary across different 7287 * subclasses of View. 7288 */ 7289 protected ContextMenuInfo getContextMenuInfo() { 7290 return null; 7291 } 7292 7293 /** 7294 * Views should implement this if the view itself is going to add items to 7295 * the context menu. 7296 * 7297 * @param menu the context menu to populate 7298 */ 7299 protected void onCreateContextMenu(ContextMenu menu) { 7300 } 7301 7302 /** 7303 * Implement this method to handle trackball motion events. The 7304 * <em>relative</em> movement of the trackball since the last event 7305 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7306 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7307 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7308 * they will often be fractional values, representing the more fine-grained 7309 * movement information available from a trackball). 7310 * 7311 * @param event The motion event. 7312 * @return True if the event was handled, false otherwise. 7313 */ 7314 public boolean onTrackballEvent(MotionEvent event) { 7315 return false; 7316 } 7317 7318 /** 7319 * Implement this method to handle generic motion events. 7320 * <p> 7321 * Generic motion events describe joystick movements, mouse hovers, track pad 7322 * touches, scroll wheel movements and other input events. The 7323 * {@link MotionEvent#getSource() source} of the motion event specifies 7324 * the class of input that was received. Implementations of this method 7325 * must examine the bits in the source before processing the event. 7326 * The following code example shows how this is done. 7327 * </p><p> 7328 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7329 * are delivered to the view under the pointer. All other generic motion events are 7330 * delivered to the focused view. 7331 * </p> 7332 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7333 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7334 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7335 * // process the joystick movement... 7336 * return true; 7337 * } 7338 * } 7339 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7340 * switch (event.getAction()) { 7341 * case MotionEvent.ACTION_HOVER_MOVE: 7342 * // process the mouse hover movement... 7343 * return true; 7344 * case MotionEvent.ACTION_SCROLL: 7345 * // process the scroll wheel movement... 7346 * return true; 7347 * } 7348 * } 7349 * return super.onGenericMotionEvent(event); 7350 * }</pre> 7351 * 7352 * @param event The generic motion event being processed. 7353 * @return True if the event was handled, false otherwise. 7354 */ 7355 public boolean onGenericMotionEvent(MotionEvent event) { 7356 return false; 7357 } 7358 7359 /** 7360 * Implement this method to handle hover events. 7361 * <p> 7362 * This method is called whenever a pointer is hovering into, over, or out of the 7363 * bounds of a view and the view is not currently being touched. 7364 * Hover events are represented as pointer events with action 7365 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7366 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7367 * </p> 7368 * <ul> 7369 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7370 * when the pointer enters the bounds of the view.</li> 7371 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7372 * when the pointer has already entered the bounds of the view and has moved.</li> 7373 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7374 * when the pointer has exited the bounds of the view or when the pointer is 7375 * about to go down due to a button click, tap, or similar user action that 7376 * causes the view to be touched.</li> 7377 * </ul> 7378 * <p> 7379 * The view should implement this method to return true to indicate that it is 7380 * handling the hover event, such as by changing its drawable state. 7381 * </p><p> 7382 * The default implementation calls {@link #setHovered} to update the hovered state 7383 * of the view when a hover enter or hover exit event is received, if the view 7384 * is enabled and is clickable. The default implementation also sends hover 7385 * accessibility events. 7386 * </p> 7387 * 7388 * @param event The motion event that describes the hover. 7389 * @return True if the view handled the hover event. 7390 * 7391 * @see #isHovered 7392 * @see #setHovered 7393 * @see #onHoverChanged 7394 */ 7395 public boolean onHoverEvent(MotionEvent event) { 7396 // The root view may receive hover (or touch) events that are outside the bounds of 7397 // the window. This code ensures that we only send accessibility events for 7398 // hovers that are actually within the bounds of the root view. 7399 final int action = event.getActionMasked(); 7400 if (!mSendingHoverAccessibilityEvents) { 7401 if ((action == MotionEvent.ACTION_HOVER_ENTER 7402 || action == MotionEvent.ACTION_HOVER_MOVE) 7403 && !hasHoveredChild() 7404 && pointInView(event.getX(), event.getY())) { 7405 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7406 mSendingHoverAccessibilityEvents = true; 7407 requestAccessibilityFocusFromHover((int) event.getX(), (int) event.getY()); 7408 } 7409 } else { 7410 if (action == MotionEvent.ACTION_HOVER_EXIT 7411 || (action == MotionEvent.ACTION_MOVE 7412 && !pointInView(event.getX(), event.getY()))) { 7413 mSendingHoverAccessibilityEvents = false; 7414 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7415 // If the window does not have input focus we take away accessibility 7416 // focus as soon as the user stop hovering over the view. 7417 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7418 getViewRootImpl().setAccessibilityFocusedHost(null); 7419 } 7420 } 7421 } 7422 7423 if (isHoverable()) { 7424 switch (action) { 7425 case MotionEvent.ACTION_HOVER_ENTER: 7426 setHovered(true); 7427 break; 7428 case MotionEvent.ACTION_HOVER_EXIT: 7429 setHovered(false); 7430 break; 7431 } 7432 7433 // Dispatch the event to onGenericMotionEvent before returning true. 7434 // This is to provide compatibility with existing applications that 7435 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7436 // break because of the new default handling for hoverable views 7437 // in onHoverEvent. 7438 // Note that onGenericMotionEvent will be called by default when 7439 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7440 dispatchGenericMotionEventInternal(event); 7441 return true; 7442 } 7443 7444 return false; 7445 } 7446 7447 /** 7448 * Returns true if the view should handle {@link #onHoverEvent} 7449 * by calling {@link #setHovered} to change its hovered state. 7450 * 7451 * @return True if the view is hoverable. 7452 */ 7453 private boolean isHoverable() { 7454 final int viewFlags = mViewFlags; 7455 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7456 return false; 7457 } 7458 7459 return (viewFlags & CLICKABLE) == CLICKABLE 7460 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7461 } 7462 7463 /** 7464 * Returns true if the view is currently hovered. 7465 * 7466 * @return True if the view is currently hovered. 7467 * 7468 * @see #setHovered 7469 * @see #onHoverChanged 7470 */ 7471 @ViewDebug.ExportedProperty 7472 public boolean isHovered() { 7473 return (mPrivateFlags & HOVERED) != 0; 7474 } 7475 7476 /** 7477 * Sets whether the view is currently hovered. 7478 * <p> 7479 * Calling this method also changes the drawable state of the view. This 7480 * enables the view to react to hover by using different drawable resources 7481 * to change its appearance. 7482 * </p><p> 7483 * The {@link #onHoverChanged} method is called when the hovered state changes. 7484 * </p> 7485 * 7486 * @param hovered True if the view is hovered. 7487 * 7488 * @see #isHovered 7489 * @see #onHoverChanged 7490 */ 7491 public void setHovered(boolean hovered) { 7492 if (hovered) { 7493 if ((mPrivateFlags & HOVERED) == 0) { 7494 mPrivateFlags |= HOVERED; 7495 refreshDrawableState(); 7496 onHoverChanged(true); 7497 } 7498 } else { 7499 if ((mPrivateFlags & HOVERED) != 0) { 7500 mPrivateFlags &= ~HOVERED; 7501 refreshDrawableState(); 7502 onHoverChanged(false); 7503 } 7504 } 7505 } 7506 7507 /** 7508 * Implement this method to handle hover state changes. 7509 * <p> 7510 * This method is called whenever the hover state changes as a result of a 7511 * call to {@link #setHovered}. 7512 * </p> 7513 * 7514 * @param hovered The current hover state, as returned by {@link #isHovered}. 7515 * 7516 * @see #isHovered 7517 * @see #setHovered 7518 */ 7519 public void onHoverChanged(boolean hovered) { 7520 } 7521 7522 /** 7523 * Implement this method to handle touch screen motion events. 7524 * 7525 * @param event The motion event. 7526 * @return True if the event was handled, false otherwise. 7527 */ 7528 public boolean onTouchEvent(MotionEvent event) { 7529 final int viewFlags = mViewFlags; 7530 7531 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7532 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7533 setPressed(false); 7534 } 7535 // A disabled view that is clickable still consumes the touch 7536 // events, it just doesn't respond to them. 7537 return (((viewFlags & CLICKABLE) == CLICKABLE || 7538 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7539 } 7540 7541 if (mTouchDelegate != null) { 7542 if (mTouchDelegate.onTouchEvent(event)) { 7543 return true; 7544 } 7545 } 7546 7547 if (((viewFlags & CLICKABLE) == CLICKABLE || 7548 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7549 switch (event.getAction()) { 7550 case MotionEvent.ACTION_UP: 7551 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7552 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7553 // take focus if we don't have it already and we should in 7554 // touch mode. 7555 boolean focusTaken = false; 7556 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7557 focusTaken = requestFocus(); 7558 } 7559 7560 if (prepressed) { 7561 // The button is being released before we actually 7562 // showed it as pressed. Make it show the pressed 7563 // state now (before scheduling the click) to ensure 7564 // the user sees it. 7565 setPressed(true); 7566 } 7567 7568 if (!mHasPerformedLongPress) { 7569 // This is a tap, so remove the longpress check 7570 removeLongPressCallback(); 7571 7572 // Only perform take click actions if we were in the pressed state 7573 if (!focusTaken) { 7574 // Use a Runnable and post this rather than calling 7575 // performClick directly. This lets other visual state 7576 // of the view update before click actions start. 7577 if (mPerformClick == null) { 7578 mPerformClick = new PerformClick(); 7579 } 7580 if (!post(mPerformClick)) { 7581 performClick(); 7582 } 7583 } 7584 } 7585 7586 if (mUnsetPressedState == null) { 7587 mUnsetPressedState = new UnsetPressedState(); 7588 } 7589 7590 if (prepressed) { 7591 postDelayed(mUnsetPressedState, 7592 ViewConfiguration.getPressedStateDuration()); 7593 } else if (!post(mUnsetPressedState)) { 7594 // If the post failed, unpress right now 7595 mUnsetPressedState.run(); 7596 } 7597 removeTapCallback(); 7598 } 7599 break; 7600 7601 case MotionEvent.ACTION_DOWN: 7602 mHasPerformedLongPress = false; 7603 7604 if (performButtonActionOnTouchDown(event)) { 7605 break; 7606 } 7607 7608 // Walk up the hierarchy to determine if we're inside a scrolling container. 7609 boolean isInScrollingContainer = isInScrollingContainer(); 7610 7611 // For views inside a scrolling container, delay the pressed feedback for 7612 // a short period in case this is a scroll. 7613 if (isInScrollingContainer) { 7614 mPrivateFlags |= PREPRESSED; 7615 if (mPendingCheckForTap == null) { 7616 mPendingCheckForTap = new CheckForTap(); 7617 } 7618 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7619 } else { 7620 // Not inside a scrolling container, so show the feedback right away 7621 setPressed(true); 7622 checkForLongClick(0); 7623 } 7624 break; 7625 7626 case MotionEvent.ACTION_CANCEL: 7627 setPressed(false); 7628 removeTapCallback(); 7629 break; 7630 7631 case MotionEvent.ACTION_MOVE: 7632 final int x = (int) event.getX(); 7633 final int y = (int) event.getY(); 7634 7635 // Be lenient about moving outside of buttons 7636 if (!pointInView(x, y, mTouchSlop)) { 7637 // Outside button 7638 removeTapCallback(); 7639 if ((mPrivateFlags & PRESSED) != 0) { 7640 // Remove any future long press/tap checks 7641 removeLongPressCallback(); 7642 7643 setPressed(false); 7644 } 7645 } 7646 break; 7647 } 7648 return true; 7649 } 7650 7651 return false; 7652 } 7653 7654 /** 7655 * @hide 7656 */ 7657 public boolean isInScrollingContainer() { 7658 ViewParent p = getParent(); 7659 while (p != null && p instanceof ViewGroup) { 7660 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7661 return true; 7662 } 7663 p = p.getParent(); 7664 } 7665 return false; 7666 } 7667 7668 /** 7669 * Remove the longpress detection timer. 7670 */ 7671 private void removeLongPressCallback() { 7672 if (mPendingCheckForLongPress != null) { 7673 removeCallbacks(mPendingCheckForLongPress); 7674 } 7675 } 7676 7677 /** 7678 * Remove the pending click action 7679 */ 7680 private void removePerformClickCallback() { 7681 if (mPerformClick != null) { 7682 removeCallbacks(mPerformClick); 7683 } 7684 } 7685 7686 /** 7687 * Remove the prepress detection timer. 7688 */ 7689 private void removeUnsetPressCallback() { 7690 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7691 setPressed(false); 7692 removeCallbacks(mUnsetPressedState); 7693 } 7694 } 7695 7696 /** 7697 * Remove the tap detection timer. 7698 */ 7699 private void removeTapCallback() { 7700 if (mPendingCheckForTap != null) { 7701 mPrivateFlags &= ~PREPRESSED; 7702 removeCallbacks(mPendingCheckForTap); 7703 } 7704 } 7705 7706 /** 7707 * Cancels a pending long press. Your subclass can use this if you 7708 * want the context menu to come up if the user presses and holds 7709 * at the same place, but you don't want it to come up if they press 7710 * and then move around enough to cause scrolling. 7711 */ 7712 public void cancelLongPress() { 7713 removeLongPressCallback(); 7714 7715 /* 7716 * The prepressed state handled by the tap callback is a display 7717 * construct, but the tap callback will post a long press callback 7718 * less its own timeout. Remove it here. 7719 */ 7720 removeTapCallback(); 7721 } 7722 7723 /** 7724 * Remove the pending callback for sending a 7725 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7726 */ 7727 private void removeSendViewScrolledAccessibilityEventCallback() { 7728 if (mSendViewScrolledAccessibilityEvent != null) { 7729 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7730 } 7731 } 7732 7733 /** 7734 * Sets the TouchDelegate for this View. 7735 */ 7736 public void setTouchDelegate(TouchDelegate delegate) { 7737 mTouchDelegate = delegate; 7738 } 7739 7740 /** 7741 * Gets the TouchDelegate for this View. 7742 */ 7743 public TouchDelegate getTouchDelegate() { 7744 return mTouchDelegate; 7745 } 7746 7747 /** 7748 * Set flags controlling behavior of this view. 7749 * 7750 * @param flags Constant indicating the value which should be set 7751 * @param mask Constant indicating the bit range that should be changed 7752 */ 7753 void setFlags(int flags, int mask) { 7754 int old = mViewFlags; 7755 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 7756 7757 int changed = mViewFlags ^ old; 7758 if (changed == 0) { 7759 return; 7760 } 7761 int privateFlags = mPrivateFlags; 7762 7763 /* Check if the FOCUSABLE bit has changed */ 7764 if (((changed & FOCUSABLE_MASK) != 0) && 7765 ((privateFlags & HAS_BOUNDS) !=0)) { 7766 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 7767 && ((privateFlags & FOCUSED) != 0)) { 7768 /* Give up focus if we are no longer focusable */ 7769 clearFocus(); 7770 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 7771 && ((privateFlags & FOCUSED) == 0)) { 7772 /* 7773 * Tell the view system that we are now available to take focus 7774 * if no one else already has it. 7775 */ 7776 if (mParent != null) mParent.focusableViewAvailable(this); 7777 } 7778 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 7779 notifyAccessibilityStateChanged(); 7780 } 7781 } 7782 7783 if ((flags & VISIBILITY_MASK) == VISIBLE) { 7784 if ((changed & VISIBILITY_MASK) != 0) { 7785 /* 7786 * If this view is becoming visible, invalidate it in case it changed while 7787 * it was not visible. Marking it drawn ensures that the invalidation will 7788 * go through. 7789 */ 7790 mPrivateFlags |= DRAWN; 7791 invalidate(true); 7792 7793 needGlobalAttributesUpdate(true); 7794 7795 // a view becoming visible is worth notifying the parent 7796 // about in case nothing has focus. even if this specific view 7797 // isn't focusable, it may contain something that is, so let 7798 // the root view try to give this focus if nothing else does. 7799 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 7800 mParent.focusableViewAvailable(this); 7801 } 7802 } 7803 } 7804 7805 /* Check if the GONE bit has changed */ 7806 if ((changed & GONE) != 0) { 7807 needGlobalAttributesUpdate(false); 7808 requestLayout(); 7809 7810 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 7811 if (hasFocus()) clearFocus(); 7812 clearAccessibilityFocus(); 7813 destroyDrawingCache(); 7814 if (mParent instanceof View) { 7815 // GONE views noop invalidation, so invalidate the parent 7816 ((View) mParent).invalidate(true); 7817 } 7818 // Mark the view drawn to ensure that it gets invalidated properly the next 7819 // time it is visible and gets invalidated 7820 mPrivateFlags |= DRAWN; 7821 } 7822 if (mAttachInfo != null) { 7823 mAttachInfo.mViewVisibilityChanged = true; 7824 } 7825 } 7826 7827 /* Check if the VISIBLE bit has changed */ 7828 if ((changed & INVISIBLE) != 0) { 7829 needGlobalAttributesUpdate(false); 7830 /* 7831 * If this view is becoming invisible, set the DRAWN flag so that 7832 * the next invalidate() will not be skipped. 7833 */ 7834 mPrivateFlags |= DRAWN; 7835 7836 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 7837 // root view becoming invisible shouldn't clear focus and accessibility focus 7838 if (getRootView() != this) { 7839 clearFocus(); 7840 clearAccessibilityFocus(); 7841 } 7842 } 7843 if (mAttachInfo != null) { 7844 mAttachInfo.mViewVisibilityChanged = true; 7845 } 7846 } 7847 7848 if ((changed & VISIBILITY_MASK) != 0) { 7849 if (mParent instanceof ViewGroup) { 7850 ((ViewGroup) mParent).onChildVisibilityChanged(this, 7851 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 7852 ((View) mParent).invalidate(true); 7853 } else if (mParent != null) { 7854 mParent.invalidateChild(this, null); 7855 } 7856 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 7857 } 7858 7859 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 7860 destroyDrawingCache(); 7861 } 7862 7863 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 7864 destroyDrawingCache(); 7865 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7866 invalidateParentCaches(); 7867 } 7868 7869 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 7870 destroyDrawingCache(); 7871 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7872 } 7873 7874 if ((changed & DRAW_MASK) != 0) { 7875 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 7876 if (mBackground != null) { 7877 mPrivateFlags &= ~SKIP_DRAW; 7878 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 7879 } else { 7880 mPrivateFlags |= SKIP_DRAW; 7881 } 7882 } else { 7883 mPrivateFlags &= ~SKIP_DRAW; 7884 } 7885 requestLayout(); 7886 invalidate(true); 7887 } 7888 7889 if ((changed & KEEP_SCREEN_ON) != 0) { 7890 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 7891 mParent.recomputeViewAttributes(this); 7892 } 7893 } 7894 7895 if (AccessibilityManager.getInstance(mContext).isEnabled() 7896 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 7897 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 7898 notifyAccessibilityStateChanged(); 7899 } 7900 } 7901 7902 /** 7903 * Change the view's z order in the tree, so it's on top of other sibling 7904 * views 7905 */ 7906 public void bringToFront() { 7907 if (mParent != null) { 7908 mParent.bringChildToFront(this); 7909 } 7910 } 7911 7912 /** 7913 * This is called in response to an internal scroll in this view (i.e., the 7914 * view scrolled its own contents). This is typically as a result of 7915 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 7916 * called. 7917 * 7918 * @param l Current horizontal scroll origin. 7919 * @param t Current vertical scroll origin. 7920 * @param oldl Previous horizontal scroll origin. 7921 * @param oldt Previous vertical scroll origin. 7922 */ 7923 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 7924 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 7925 postSendViewScrolledAccessibilityEventCallback(); 7926 } 7927 7928 mBackgroundSizeChanged = true; 7929 7930 final AttachInfo ai = mAttachInfo; 7931 if (ai != null) { 7932 ai.mViewScrollChanged = true; 7933 } 7934 } 7935 7936 /** 7937 * Interface definition for a callback to be invoked when the layout bounds of a view 7938 * changes due to layout processing. 7939 */ 7940 public interface OnLayoutChangeListener { 7941 /** 7942 * Called when the focus state of a view has changed. 7943 * 7944 * @param v The view whose state has changed. 7945 * @param left The new value of the view's left property. 7946 * @param top The new value of the view's top property. 7947 * @param right The new value of the view's right property. 7948 * @param bottom The new value of the view's bottom property. 7949 * @param oldLeft The previous value of the view's left property. 7950 * @param oldTop The previous value of the view's top property. 7951 * @param oldRight The previous value of the view's right property. 7952 * @param oldBottom The previous value of the view's bottom property. 7953 */ 7954 void onLayoutChange(View v, int left, int top, int right, int bottom, 7955 int oldLeft, int oldTop, int oldRight, int oldBottom); 7956 } 7957 7958 /** 7959 * This is called during layout when the size of this view has changed. If 7960 * you were just added to the view hierarchy, you're called with the old 7961 * values of 0. 7962 * 7963 * @param w Current width of this view. 7964 * @param h Current height of this view. 7965 * @param oldw Old width of this view. 7966 * @param oldh Old height of this view. 7967 */ 7968 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 7969 } 7970 7971 /** 7972 * Called by draw to draw the child views. This may be overridden 7973 * by derived classes to gain control just before its children are drawn 7974 * (but after its own view has been drawn). 7975 * @param canvas the canvas on which to draw the view 7976 */ 7977 protected void dispatchDraw(Canvas canvas) { 7978 7979 } 7980 7981 /** 7982 * Gets the parent of this view. Note that the parent is a 7983 * ViewParent and not necessarily a View. 7984 * 7985 * @return Parent of this view. 7986 */ 7987 public final ViewParent getParent() { 7988 return mParent; 7989 } 7990 7991 /** 7992 * Set the horizontal scrolled position of your view. This will cause a call to 7993 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7994 * invalidated. 7995 * @param value the x position to scroll to 7996 */ 7997 public void setScrollX(int value) { 7998 scrollTo(value, mScrollY); 7999 } 8000 8001 /** 8002 * Set the vertical scrolled position of your view. This will cause a call to 8003 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8004 * invalidated. 8005 * @param value the y position to scroll to 8006 */ 8007 public void setScrollY(int value) { 8008 scrollTo(mScrollX, value); 8009 } 8010 8011 /** 8012 * Return the scrolled left position of this view. This is the left edge of 8013 * the displayed part of your view. You do not need to draw any pixels 8014 * farther left, since those are outside of the frame of your view on 8015 * screen. 8016 * 8017 * @return The left edge of the displayed part of your view, in pixels. 8018 */ 8019 public final int getScrollX() { 8020 return mScrollX; 8021 } 8022 8023 /** 8024 * Return the scrolled top position of this view. This is the top edge of 8025 * the displayed part of your view. You do not need to draw any pixels above 8026 * it, since those are outside of the frame of your view on screen. 8027 * 8028 * @return The top edge of the displayed part of your view, in pixels. 8029 */ 8030 public final int getScrollY() { 8031 return mScrollY; 8032 } 8033 8034 /** 8035 * Return the width of the your view. 8036 * 8037 * @return The width of your view, in pixels. 8038 */ 8039 @ViewDebug.ExportedProperty(category = "layout") 8040 public final int getWidth() { 8041 return mRight - mLeft; 8042 } 8043 8044 /** 8045 * Return the height of your view. 8046 * 8047 * @return The height of your view, in pixels. 8048 */ 8049 @ViewDebug.ExportedProperty(category = "layout") 8050 public final int getHeight() { 8051 return mBottom - mTop; 8052 } 8053 8054 /** 8055 * Return the visible drawing bounds of your view. Fills in the output 8056 * rectangle with the values from getScrollX(), getScrollY(), 8057 * getWidth(), and getHeight(). 8058 * 8059 * @param outRect The (scrolled) drawing bounds of the view. 8060 */ 8061 public void getDrawingRect(Rect outRect) { 8062 outRect.left = mScrollX; 8063 outRect.top = mScrollY; 8064 outRect.right = mScrollX + (mRight - mLeft); 8065 outRect.bottom = mScrollY + (mBottom - mTop); 8066 } 8067 8068 /** 8069 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8070 * raw width component (that is the result is masked by 8071 * {@link #MEASURED_SIZE_MASK}). 8072 * 8073 * @return The raw measured width of this view. 8074 */ 8075 public final int getMeasuredWidth() { 8076 return mMeasuredWidth & MEASURED_SIZE_MASK; 8077 } 8078 8079 /** 8080 * Return the full width measurement information for this view as computed 8081 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8082 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8083 * This should be used during measurement and layout calculations only. Use 8084 * {@link #getWidth()} to see how wide a view is after layout. 8085 * 8086 * @return The measured width of this view as a bit mask. 8087 */ 8088 public final int getMeasuredWidthAndState() { 8089 return mMeasuredWidth; 8090 } 8091 8092 /** 8093 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8094 * raw width component (that is the result is masked by 8095 * {@link #MEASURED_SIZE_MASK}). 8096 * 8097 * @return The raw measured height of this view. 8098 */ 8099 public final int getMeasuredHeight() { 8100 return mMeasuredHeight & MEASURED_SIZE_MASK; 8101 } 8102 8103 /** 8104 * Return the full height measurement information for this view as computed 8105 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8106 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8107 * This should be used during measurement and layout calculations only. Use 8108 * {@link #getHeight()} to see how wide a view is after layout. 8109 * 8110 * @return The measured width of this view as a bit mask. 8111 */ 8112 public final int getMeasuredHeightAndState() { 8113 return mMeasuredHeight; 8114 } 8115 8116 /** 8117 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8118 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8119 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8120 * and the height component is at the shifted bits 8121 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8122 */ 8123 public final int getMeasuredState() { 8124 return (mMeasuredWidth&MEASURED_STATE_MASK) 8125 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8126 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8127 } 8128 8129 /** 8130 * The transform matrix of this view, which is calculated based on the current 8131 * roation, scale, and pivot properties. 8132 * 8133 * @see #getRotation() 8134 * @see #getScaleX() 8135 * @see #getScaleY() 8136 * @see #getPivotX() 8137 * @see #getPivotY() 8138 * @return The current transform matrix for the view 8139 */ 8140 public Matrix getMatrix() { 8141 if (mTransformationInfo != null) { 8142 updateMatrix(); 8143 return mTransformationInfo.mMatrix; 8144 } 8145 return Matrix.IDENTITY_MATRIX; 8146 } 8147 8148 /** 8149 * Utility function to determine if the value is far enough away from zero to be 8150 * considered non-zero. 8151 * @param value A floating point value to check for zero-ness 8152 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8153 */ 8154 private static boolean nonzero(float value) { 8155 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8156 } 8157 8158 /** 8159 * Returns true if the transform matrix is the identity matrix. 8160 * Recomputes the matrix if necessary. 8161 * 8162 * @return True if the transform matrix is the identity matrix, false otherwise. 8163 */ 8164 final boolean hasIdentityMatrix() { 8165 if (mTransformationInfo != null) { 8166 updateMatrix(); 8167 return mTransformationInfo.mMatrixIsIdentity; 8168 } 8169 return true; 8170 } 8171 8172 void ensureTransformationInfo() { 8173 if (mTransformationInfo == null) { 8174 mTransformationInfo = new TransformationInfo(); 8175 } 8176 } 8177 8178 /** 8179 * Recomputes the transform matrix if necessary. 8180 */ 8181 private void updateMatrix() { 8182 final TransformationInfo info = mTransformationInfo; 8183 if (info == null) { 8184 return; 8185 } 8186 if (info.mMatrixDirty) { 8187 // transform-related properties have changed since the last time someone 8188 // asked for the matrix; recalculate it with the current values 8189 8190 // Figure out if we need to update the pivot point 8191 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8192 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8193 info.mPrevWidth = mRight - mLeft; 8194 info.mPrevHeight = mBottom - mTop; 8195 info.mPivotX = info.mPrevWidth / 2f; 8196 info.mPivotY = info.mPrevHeight / 2f; 8197 } 8198 } 8199 info.mMatrix.reset(); 8200 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8201 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8202 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8203 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8204 } else { 8205 if (info.mCamera == null) { 8206 info.mCamera = new Camera(); 8207 info.matrix3D = new Matrix(); 8208 } 8209 info.mCamera.save(); 8210 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8211 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8212 info.mCamera.getMatrix(info.matrix3D); 8213 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8214 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8215 info.mPivotY + info.mTranslationY); 8216 info.mMatrix.postConcat(info.matrix3D); 8217 info.mCamera.restore(); 8218 } 8219 info.mMatrixDirty = false; 8220 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8221 info.mInverseMatrixDirty = true; 8222 } 8223 } 8224 8225 /** 8226 * Utility method to retrieve the inverse of the current mMatrix property. 8227 * We cache the matrix to avoid recalculating it when transform properties 8228 * have not changed. 8229 * 8230 * @return The inverse of the current matrix of this view. 8231 */ 8232 final Matrix getInverseMatrix() { 8233 final TransformationInfo info = mTransformationInfo; 8234 if (info != null) { 8235 updateMatrix(); 8236 if (info.mInverseMatrixDirty) { 8237 if (info.mInverseMatrix == null) { 8238 info.mInverseMatrix = new Matrix(); 8239 } 8240 info.mMatrix.invert(info.mInverseMatrix); 8241 info.mInverseMatrixDirty = false; 8242 } 8243 return info.mInverseMatrix; 8244 } 8245 return Matrix.IDENTITY_MATRIX; 8246 } 8247 8248 /** 8249 * Gets the distance along the Z axis from the camera to this view. 8250 * 8251 * @see #setCameraDistance(float) 8252 * 8253 * @return The distance along the Z axis. 8254 */ 8255 public float getCameraDistance() { 8256 ensureTransformationInfo(); 8257 final float dpi = mResources.getDisplayMetrics().densityDpi; 8258 final TransformationInfo info = mTransformationInfo; 8259 if (info.mCamera == null) { 8260 info.mCamera = new Camera(); 8261 info.matrix3D = new Matrix(); 8262 } 8263 return -(info.mCamera.getLocationZ() * dpi); 8264 } 8265 8266 /** 8267 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8268 * views are drawn) from the camera to this view. The camera's distance 8269 * affects 3D transformations, for instance rotations around the X and Y 8270 * axis. If the rotationX or rotationY properties are changed and this view is 8271 * large (more than half the size of the screen), it is recommended to always 8272 * use a camera distance that's greater than the height (X axis rotation) or 8273 * the width (Y axis rotation) of this view.</p> 8274 * 8275 * <p>The distance of the camera from the view plane can have an affect on the 8276 * perspective distortion of the view when it is rotated around the x or y axis. 8277 * For example, a large distance will result in a large viewing angle, and there 8278 * will not be much perspective distortion of the view as it rotates. A short 8279 * distance may cause much more perspective distortion upon rotation, and can 8280 * also result in some drawing artifacts if the rotated view ends up partially 8281 * behind the camera (which is why the recommendation is to use a distance at 8282 * least as far as the size of the view, if the view is to be rotated.)</p> 8283 * 8284 * <p>The distance is expressed in "depth pixels." The default distance depends 8285 * on the screen density. For instance, on a medium density display, the 8286 * default distance is 1280. On a high density display, the default distance 8287 * is 1920.</p> 8288 * 8289 * <p>If you want to specify a distance that leads to visually consistent 8290 * results across various densities, use the following formula:</p> 8291 * <pre> 8292 * float scale = context.getResources().getDisplayMetrics().density; 8293 * view.setCameraDistance(distance * scale); 8294 * </pre> 8295 * 8296 * <p>The density scale factor of a high density display is 1.5, 8297 * and 1920 = 1280 * 1.5.</p> 8298 * 8299 * @param distance The distance in "depth pixels", if negative the opposite 8300 * value is used 8301 * 8302 * @see #setRotationX(float) 8303 * @see #setRotationY(float) 8304 */ 8305 public void setCameraDistance(float distance) { 8306 invalidateViewProperty(true, false); 8307 8308 ensureTransformationInfo(); 8309 final float dpi = mResources.getDisplayMetrics().densityDpi; 8310 final TransformationInfo info = mTransformationInfo; 8311 if (info.mCamera == null) { 8312 info.mCamera = new Camera(); 8313 info.matrix3D = new Matrix(); 8314 } 8315 8316 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8317 info.mMatrixDirty = true; 8318 8319 invalidateViewProperty(false, false); 8320 if (mDisplayList != null) { 8321 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8322 } 8323 } 8324 8325 /** 8326 * The degrees that the view is rotated around the pivot point. 8327 * 8328 * @see #setRotation(float) 8329 * @see #getPivotX() 8330 * @see #getPivotY() 8331 * 8332 * @return The degrees of rotation. 8333 */ 8334 @ViewDebug.ExportedProperty(category = "drawing") 8335 public float getRotation() { 8336 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8337 } 8338 8339 /** 8340 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8341 * result in clockwise rotation. 8342 * 8343 * @param rotation The degrees of rotation. 8344 * 8345 * @see #getRotation() 8346 * @see #getPivotX() 8347 * @see #getPivotY() 8348 * @see #setRotationX(float) 8349 * @see #setRotationY(float) 8350 * 8351 * @attr ref android.R.styleable#View_rotation 8352 */ 8353 public void setRotation(float rotation) { 8354 ensureTransformationInfo(); 8355 final TransformationInfo info = mTransformationInfo; 8356 if (info.mRotation != rotation) { 8357 // Double-invalidation is necessary to capture view's old and new areas 8358 invalidateViewProperty(true, false); 8359 info.mRotation = rotation; 8360 info.mMatrixDirty = true; 8361 invalidateViewProperty(false, true); 8362 if (mDisplayList != null) { 8363 mDisplayList.setRotation(rotation); 8364 } 8365 } 8366 } 8367 8368 /** 8369 * The degrees that the view is rotated around the vertical axis through the pivot point. 8370 * 8371 * @see #getPivotX() 8372 * @see #getPivotY() 8373 * @see #setRotationY(float) 8374 * 8375 * @return The degrees of Y rotation. 8376 */ 8377 @ViewDebug.ExportedProperty(category = "drawing") 8378 public float getRotationY() { 8379 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8380 } 8381 8382 /** 8383 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8384 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8385 * down the y axis. 8386 * 8387 * When rotating large views, it is recommended to adjust the camera distance 8388 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8389 * 8390 * @param rotationY The degrees of Y rotation. 8391 * 8392 * @see #getRotationY() 8393 * @see #getPivotX() 8394 * @see #getPivotY() 8395 * @see #setRotation(float) 8396 * @see #setRotationX(float) 8397 * @see #setCameraDistance(float) 8398 * 8399 * @attr ref android.R.styleable#View_rotationY 8400 */ 8401 public void setRotationY(float rotationY) { 8402 ensureTransformationInfo(); 8403 final TransformationInfo info = mTransformationInfo; 8404 if (info.mRotationY != rotationY) { 8405 invalidateViewProperty(true, false); 8406 info.mRotationY = rotationY; 8407 info.mMatrixDirty = true; 8408 invalidateViewProperty(false, true); 8409 if (mDisplayList != null) { 8410 mDisplayList.setRotationY(rotationY); 8411 } 8412 } 8413 } 8414 8415 /** 8416 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8417 * 8418 * @see #getPivotX() 8419 * @see #getPivotY() 8420 * @see #setRotationX(float) 8421 * 8422 * @return The degrees of X rotation. 8423 */ 8424 @ViewDebug.ExportedProperty(category = "drawing") 8425 public float getRotationX() { 8426 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8427 } 8428 8429 /** 8430 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8431 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8432 * x axis. 8433 * 8434 * When rotating large views, it is recommended to adjust the camera distance 8435 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8436 * 8437 * @param rotationX The degrees of X rotation. 8438 * 8439 * @see #getRotationX() 8440 * @see #getPivotX() 8441 * @see #getPivotY() 8442 * @see #setRotation(float) 8443 * @see #setRotationY(float) 8444 * @see #setCameraDistance(float) 8445 * 8446 * @attr ref android.R.styleable#View_rotationX 8447 */ 8448 public void setRotationX(float rotationX) { 8449 ensureTransformationInfo(); 8450 final TransformationInfo info = mTransformationInfo; 8451 if (info.mRotationX != rotationX) { 8452 invalidateViewProperty(true, false); 8453 info.mRotationX = rotationX; 8454 info.mMatrixDirty = true; 8455 invalidateViewProperty(false, true); 8456 if (mDisplayList != null) { 8457 mDisplayList.setRotationX(rotationX); 8458 } 8459 } 8460 } 8461 8462 /** 8463 * The amount that the view is scaled in x around the pivot point, as a proportion of 8464 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8465 * 8466 * <p>By default, this is 1.0f. 8467 * 8468 * @see #getPivotX() 8469 * @see #getPivotY() 8470 * @return The scaling factor. 8471 */ 8472 @ViewDebug.ExportedProperty(category = "drawing") 8473 public float getScaleX() { 8474 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8475 } 8476 8477 /** 8478 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8479 * the view's unscaled width. A value of 1 means that no scaling is applied. 8480 * 8481 * @param scaleX The scaling factor. 8482 * @see #getPivotX() 8483 * @see #getPivotY() 8484 * 8485 * @attr ref android.R.styleable#View_scaleX 8486 */ 8487 public void setScaleX(float scaleX) { 8488 ensureTransformationInfo(); 8489 final TransformationInfo info = mTransformationInfo; 8490 if (info.mScaleX != scaleX) { 8491 invalidateViewProperty(true, false); 8492 info.mScaleX = scaleX; 8493 info.mMatrixDirty = true; 8494 invalidateViewProperty(false, true); 8495 if (mDisplayList != null) { 8496 mDisplayList.setScaleX(scaleX); 8497 } 8498 } 8499 } 8500 8501 /** 8502 * The amount that the view is scaled in y around the pivot point, as a proportion of 8503 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8504 * 8505 * <p>By default, this is 1.0f. 8506 * 8507 * @see #getPivotX() 8508 * @see #getPivotY() 8509 * @return The scaling factor. 8510 */ 8511 @ViewDebug.ExportedProperty(category = "drawing") 8512 public float getScaleY() { 8513 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8514 } 8515 8516 /** 8517 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8518 * the view's unscaled width. A value of 1 means that no scaling is applied. 8519 * 8520 * @param scaleY The scaling factor. 8521 * @see #getPivotX() 8522 * @see #getPivotY() 8523 * 8524 * @attr ref android.R.styleable#View_scaleY 8525 */ 8526 public void setScaleY(float scaleY) { 8527 ensureTransformationInfo(); 8528 final TransformationInfo info = mTransformationInfo; 8529 if (info.mScaleY != scaleY) { 8530 invalidateViewProperty(true, false); 8531 info.mScaleY = scaleY; 8532 info.mMatrixDirty = true; 8533 invalidateViewProperty(false, true); 8534 if (mDisplayList != null) { 8535 mDisplayList.setScaleY(scaleY); 8536 } 8537 } 8538 } 8539 8540 /** 8541 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8542 * and {@link #setScaleX(float) scaled}. 8543 * 8544 * @see #getRotation() 8545 * @see #getScaleX() 8546 * @see #getScaleY() 8547 * @see #getPivotY() 8548 * @return The x location of the pivot point. 8549 * 8550 * @attr ref android.R.styleable#View_transformPivotX 8551 */ 8552 @ViewDebug.ExportedProperty(category = "drawing") 8553 public float getPivotX() { 8554 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8555 } 8556 8557 /** 8558 * Sets the x location of the point around which the view is 8559 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8560 * By default, the pivot point is centered on the object. 8561 * Setting this property disables this behavior and causes the view to use only the 8562 * explicitly set pivotX and pivotY values. 8563 * 8564 * @param pivotX The x location of the pivot point. 8565 * @see #getRotation() 8566 * @see #getScaleX() 8567 * @see #getScaleY() 8568 * @see #getPivotY() 8569 * 8570 * @attr ref android.R.styleable#View_transformPivotX 8571 */ 8572 public void setPivotX(float pivotX) { 8573 ensureTransformationInfo(); 8574 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8575 final TransformationInfo info = mTransformationInfo; 8576 if (info.mPivotX != pivotX) { 8577 invalidateViewProperty(true, false); 8578 info.mPivotX = pivotX; 8579 info.mMatrixDirty = true; 8580 invalidateViewProperty(false, true); 8581 if (mDisplayList != null) { 8582 mDisplayList.setPivotX(pivotX); 8583 } 8584 } 8585 } 8586 8587 /** 8588 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8589 * and {@link #setScaleY(float) scaled}. 8590 * 8591 * @see #getRotation() 8592 * @see #getScaleX() 8593 * @see #getScaleY() 8594 * @see #getPivotY() 8595 * @return The y location of the pivot point. 8596 * 8597 * @attr ref android.R.styleable#View_transformPivotY 8598 */ 8599 @ViewDebug.ExportedProperty(category = "drawing") 8600 public float getPivotY() { 8601 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8602 } 8603 8604 /** 8605 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8606 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8607 * Setting this property disables this behavior and causes the view to use only the 8608 * explicitly set pivotX and pivotY values. 8609 * 8610 * @param pivotY The y location of the pivot point. 8611 * @see #getRotation() 8612 * @see #getScaleX() 8613 * @see #getScaleY() 8614 * @see #getPivotY() 8615 * 8616 * @attr ref android.R.styleable#View_transformPivotY 8617 */ 8618 public void setPivotY(float pivotY) { 8619 ensureTransformationInfo(); 8620 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8621 final TransformationInfo info = mTransformationInfo; 8622 if (info.mPivotY != pivotY) { 8623 invalidateViewProperty(true, false); 8624 info.mPivotY = pivotY; 8625 info.mMatrixDirty = true; 8626 invalidateViewProperty(false, true); 8627 if (mDisplayList != null) { 8628 mDisplayList.setPivotY(pivotY); 8629 } 8630 } 8631 } 8632 8633 /** 8634 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8635 * completely transparent and 1 means the view is completely opaque. 8636 * 8637 * <p>By default this is 1.0f. 8638 * @return The opacity of the view. 8639 */ 8640 @ViewDebug.ExportedProperty(category = "drawing") 8641 public float getAlpha() { 8642 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8643 } 8644 8645 /** 8646 * Returns whether this View has content which overlaps. This function, intended to be 8647 * overridden by specific View types, is an optimization when alpha is set on a view. If 8648 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8649 * and then composited it into place, which can be expensive. If the view has no overlapping 8650 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8651 * An example of overlapping rendering is a TextView with a background image, such as a 8652 * Button. An example of non-overlapping rendering is a TextView with no background, or 8653 * an ImageView with only the foreground image. The default implementation returns true; 8654 * subclasses should override if they have cases which can be optimized. 8655 * 8656 * @return true if the content in this view might overlap, false otherwise. 8657 */ 8658 public boolean hasOverlappingRendering() { 8659 return true; 8660 } 8661 8662 /** 8663 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8664 * completely transparent and 1 means the view is completely opaque.</p> 8665 * 8666 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8667 * responsible for applying the opacity itself. Otherwise, calling this method is 8668 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8669 * setting a hardware layer.</p> 8670 * 8671 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8672 * performance implications. It is generally best to use the alpha property sparingly and 8673 * transiently, as in the case of fading animations.</p> 8674 * 8675 * @param alpha The opacity of the view. 8676 * 8677 * @see #setLayerType(int, android.graphics.Paint) 8678 * 8679 * @attr ref android.R.styleable#View_alpha 8680 */ 8681 public void setAlpha(float alpha) { 8682 ensureTransformationInfo(); 8683 if (mTransformationInfo.mAlpha != alpha) { 8684 mTransformationInfo.mAlpha = alpha; 8685 if (onSetAlpha((int) (alpha * 255))) { 8686 mPrivateFlags |= ALPHA_SET; 8687 // subclass is handling alpha - don't optimize rendering cache invalidation 8688 invalidateParentCaches(); 8689 invalidate(true); 8690 } else { 8691 mPrivateFlags &= ~ALPHA_SET; 8692 invalidateViewProperty(true, false); 8693 if (mDisplayList != null) { 8694 mDisplayList.setAlpha(alpha); 8695 } 8696 } 8697 } 8698 } 8699 8700 /** 8701 * Faster version of setAlpha() which performs the same steps except there are 8702 * no calls to invalidate(). The caller of this function should perform proper invalidation 8703 * on the parent and this object. The return value indicates whether the subclass handles 8704 * alpha (the return value for onSetAlpha()). 8705 * 8706 * @param alpha The new value for the alpha property 8707 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 8708 * the new value for the alpha property is different from the old value 8709 */ 8710 boolean setAlphaNoInvalidation(float alpha) { 8711 ensureTransformationInfo(); 8712 if (mTransformationInfo.mAlpha != alpha) { 8713 mTransformationInfo.mAlpha = alpha; 8714 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 8715 if (subclassHandlesAlpha) { 8716 mPrivateFlags |= ALPHA_SET; 8717 return true; 8718 } else { 8719 mPrivateFlags &= ~ALPHA_SET; 8720 if (mDisplayList != null) { 8721 mDisplayList.setAlpha(alpha); 8722 } 8723 } 8724 } 8725 return false; 8726 } 8727 8728 /** 8729 * Top position of this view relative to its parent. 8730 * 8731 * @return The top of this view, in pixels. 8732 */ 8733 @ViewDebug.CapturedViewProperty 8734 public final int getTop() { 8735 return mTop; 8736 } 8737 8738 /** 8739 * Sets the top position of this view relative to its parent. This method is meant to be called 8740 * by the layout system and should not generally be called otherwise, because the property 8741 * may be changed at any time by the layout. 8742 * 8743 * @param top The top of this view, in pixels. 8744 */ 8745 public final void setTop(int top) { 8746 if (top != mTop) { 8747 updateMatrix(); 8748 final boolean matrixIsIdentity = mTransformationInfo == null 8749 || mTransformationInfo.mMatrixIsIdentity; 8750 if (matrixIsIdentity) { 8751 if (mAttachInfo != null) { 8752 int minTop; 8753 int yLoc; 8754 if (top < mTop) { 8755 minTop = top; 8756 yLoc = top - mTop; 8757 } else { 8758 minTop = mTop; 8759 yLoc = 0; 8760 } 8761 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 8762 } 8763 } else { 8764 // Double-invalidation is necessary to capture view's old and new areas 8765 invalidate(true); 8766 } 8767 8768 int width = mRight - mLeft; 8769 int oldHeight = mBottom - mTop; 8770 8771 mTop = top; 8772 if (mDisplayList != null) { 8773 mDisplayList.setTop(mTop); 8774 } 8775 8776 onSizeChanged(width, mBottom - mTop, width, oldHeight); 8777 8778 if (!matrixIsIdentity) { 8779 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8780 // A change in dimension means an auto-centered pivot point changes, too 8781 mTransformationInfo.mMatrixDirty = true; 8782 } 8783 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8784 invalidate(true); 8785 } 8786 mBackgroundSizeChanged = true; 8787 invalidateParentIfNeeded(); 8788 } 8789 } 8790 8791 /** 8792 * Bottom position of this view relative to its parent. 8793 * 8794 * @return The bottom of this view, in pixels. 8795 */ 8796 @ViewDebug.CapturedViewProperty 8797 public final int getBottom() { 8798 return mBottom; 8799 } 8800 8801 /** 8802 * True if this view has changed since the last time being drawn. 8803 * 8804 * @return The dirty state of this view. 8805 */ 8806 public boolean isDirty() { 8807 return (mPrivateFlags & DIRTY_MASK) != 0; 8808 } 8809 8810 /** 8811 * Sets the bottom position of this view relative to its parent. This method is meant to be 8812 * called by the layout system and should not generally be called otherwise, because the 8813 * property may be changed at any time by the layout. 8814 * 8815 * @param bottom The bottom of this view, in pixels. 8816 */ 8817 public final void setBottom(int bottom) { 8818 if (bottom != mBottom) { 8819 updateMatrix(); 8820 final boolean matrixIsIdentity = mTransformationInfo == null 8821 || mTransformationInfo.mMatrixIsIdentity; 8822 if (matrixIsIdentity) { 8823 if (mAttachInfo != null) { 8824 int maxBottom; 8825 if (bottom < mBottom) { 8826 maxBottom = mBottom; 8827 } else { 8828 maxBottom = bottom; 8829 } 8830 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 8831 } 8832 } else { 8833 // Double-invalidation is necessary to capture view's old and new areas 8834 invalidate(true); 8835 } 8836 8837 int width = mRight - mLeft; 8838 int oldHeight = mBottom - mTop; 8839 8840 mBottom = bottom; 8841 if (mDisplayList != null) { 8842 mDisplayList.setBottom(mBottom); 8843 } 8844 8845 onSizeChanged(width, mBottom - mTop, width, oldHeight); 8846 8847 if (!matrixIsIdentity) { 8848 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8849 // A change in dimension means an auto-centered pivot point changes, too 8850 mTransformationInfo.mMatrixDirty = true; 8851 } 8852 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8853 invalidate(true); 8854 } 8855 mBackgroundSizeChanged = true; 8856 invalidateParentIfNeeded(); 8857 } 8858 } 8859 8860 /** 8861 * Left position of this view relative to its parent. 8862 * 8863 * @return The left edge of this view, in pixels. 8864 */ 8865 @ViewDebug.CapturedViewProperty 8866 public final int getLeft() { 8867 return mLeft; 8868 } 8869 8870 /** 8871 * Sets the left position of this view relative to its parent. This method is meant to be called 8872 * by the layout system and should not generally be called otherwise, because the property 8873 * may be changed at any time by the layout. 8874 * 8875 * @param left The bottom of this view, in pixels. 8876 */ 8877 public final void setLeft(int left) { 8878 if (left != mLeft) { 8879 updateMatrix(); 8880 final boolean matrixIsIdentity = mTransformationInfo == null 8881 || mTransformationInfo.mMatrixIsIdentity; 8882 if (matrixIsIdentity) { 8883 if (mAttachInfo != null) { 8884 int minLeft; 8885 int xLoc; 8886 if (left < mLeft) { 8887 minLeft = left; 8888 xLoc = left - mLeft; 8889 } else { 8890 minLeft = mLeft; 8891 xLoc = 0; 8892 } 8893 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 8894 } 8895 } else { 8896 // Double-invalidation is necessary to capture view's old and new areas 8897 invalidate(true); 8898 } 8899 8900 int oldWidth = mRight - mLeft; 8901 int height = mBottom - mTop; 8902 8903 mLeft = left; 8904 if (mDisplayList != null) { 8905 mDisplayList.setLeft(left); 8906 } 8907 8908 onSizeChanged(mRight - mLeft, height, oldWidth, height); 8909 8910 if (!matrixIsIdentity) { 8911 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8912 // A change in dimension means an auto-centered pivot point changes, too 8913 mTransformationInfo.mMatrixDirty = true; 8914 } 8915 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8916 invalidate(true); 8917 } 8918 mBackgroundSizeChanged = true; 8919 invalidateParentIfNeeded(); 8920 } 8921 } 8922 8923 /** 8924 * Right position of this view relative to its parent. 8925 * 8926 * @return The right edge of this view, in pixels. 8927 */ 8928 @ViewDebug.CapturedViewProperty 8929 public final int getRight() { 8930 return mRight; 8931 } 8932 8933 /** 8934 * Sets the right position of this view relative to its parent. This method is meant to be called 8935 * by the layout system and should not generally be called otherwise, because the property 8936 * may be changed at any time by the layout. 8937 * 8938 * @param right The bottom of this view, in pixels. 8939 */ 8940 public final void setRight(int right) { 8941 if (right != mRight) { 8942 updateMatrix(); 8943 final boolean matrixIsIdentity = mTransformationInfo == null 8944 || mTransformationInfo.mMatrixIsIdentity; 8945 if (matrixIsIdentity) { 8946 if (mAttachInfo != null) { 8947 int maxRight; 8948 if (right < mRight) { 8949 maxRight = mRight; 8950 } else { 8951 maxRight = right; 8952 } 8953 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 8954 } 8955 } else { 8956 // Double-invalidation is necessary to capture view's old and new areas 8957 invalidate(true); 8958 } 8959 8960 int oldWidth = mRight - mLeft; 8961 int height = mBottom - mTop; 8962 8963 mRight = right; 8964 if (mDisplayList != null) { 8965 mDisplayList.setRight(mRight); 8966 } 8967 8968 onSizeChanged(mRight - mLeft, height, oldWidth, height); 8969 8970 if (!matrixIsIdentity) { 8971 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8972 // A change in dimension means an auto-centered pivot point changes, too 8973 mTransformationInfo.mMatrixDirty = true; 8974 } 8975 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8976 invalidate(true); 8977 } 8978 mBackgroundSizeChanged = true; 8979 invalidateParentIfNeeded(); 8980 } 8981 } 8982 8983 /** 8984 * The visual x position of this view, in pixels. This is equivalent to the 8985 * {@link #setTranslationX(float) translationX} property plus the current 8986 * {@link #getLeft() left} property. 8987 * 8988 * @return The visual x position of this view, in pixels. 8989 */ 8990 @ViewDebug.ExportedProperty(category = "drawing") 8991 public float getX() { 8992 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 8993 } 8994 8995 /** 8996 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 8997 * {@link #setTranslationX(float) translationX} property to be the difference between 8998 * the x value passed in and the current {@link #getLeft() left} property. 8999 * 9000 * @param x The visual x position of this view, in pixels. 9001 */ 9002 public void setX(float x) { 9003 setTranslationX(x - mLeft); 9004 } 9005 9006 /** 9007 * The visual y position of this view, in pixels. This is equivalent to the 9008 * {@link #setTranslationY(float) translationY} property plus the current 9009 * {@link #getTop() top} property. 9010 * 9011 * @return The visual y position of this view, in pixels. 9012 */ 9013 @ViewDebug.ExportedProperty(category = "drawing") 9014 public float getY() { 9015 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 9016 } 9017 9018 /** 9019 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9020 * {@link #setTranslationY(float) translationY} property to be the difference between 9021 * the y value passed in and the current {@link #getTop() top} property. 9022 * 9023 * @param y The visual y position of this view, in pixels. 9024 */ 9025 public void setY(float y) { 9026 setTranslationY(y - mTop); 9027 } 9028 9029 9030 /** 9031 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9032 * This position is post-layout, in addition to wherever the object's 9033 * layout placed it. 9034 * 9035 * @return The horizontal position of this view relative to its left position, in pixels. 9036 */ 9037 @ViewDebug.ExportedProperty(category = "drawing") 9038 public float getTranslationX() { 9039 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9040 } 9041 9042 /** 9043 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9044 * This effectively positions the object post-layout, in addition to wherever the object's 9045 * layout placed it. 9046 * 9047 * @param translationX The horizontal position of this view relative to its left position, 9048 * in pixels. 9049 * 9050 * @attr ref android.R.styleable#View_translationX 9051 */ 9052 public void setTranslationX(float translationX) { 9053 ensureTransformationInfo(); 9054 final TransformationInfo info = mTransformationInfo; 9055 if (info.mTranslationX != translationX) { 9056 // Double-invalidation is necessary to capture view's old and new areas 9057 invalidateViewProperty(true, false); 9058 info.mTranslationX = translationX; 9059 info.mMatrixDirty = true; 9060 invalidateViewProperty(false, true); 9061 if (mDisplayList != null) { 9062 mDisplayList.setTranslationX(translationX); 9063 } 9064 } 9065 } 9066 9067 /** 9068 * The horizontal location of this view relative to its {@link #getTop() top} position. 9069 * This position is post-layout, in addition to wherever the object's 9070 * layout placed it. 9071 * 9072 * @return The vertical position of this view relative to its top position, 9073 * in pixels. 9074 */ 9075 @ViewDebug.ExportedProperty(category = "drawing") 9076 public float getTranslationY() { 9077 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9078 } 9079 9080 /** 9081 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9082 * This effectively positions the object post-layout, in addition to wherever the object's 9083 * layout placed it. 9084 * 9085 * @param translationY The vertical position of this view relative to its top position, 9086 * in pixels. 9087 * 9088 * @attr ref android.R.styleable#View_translationY 9089 */ 9090 public void setTranslationY(float translationY) { 9091 ensureTransformationInfo(); 9092 final TransformationInfo info = mTransformationInfo; 9093 if (info.mTranslationY != translationY) { 9094 invalidateViewProperty(true, false); 9095 info.mTranslationY = translationY; 9096 info.mMatrixDirty = true; 9097 invalidateViewProperty(false, true); 9098 if (mDisplayList != null) { 9099 mDisplayList.setTranslationY(translationY); 9100 } 9101 } 9102 } 9103 9104 /** 9105 * Hit rectangle in parent's coordinates 9106 * 9107 * @param outRect The hit rectangle of the view. 9108 */ 9109 public void getHitRect(Rect outRect) { 9110 updateMatrix(); 9111 final TransformationInfo info = mTransformationInfo; 9112 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9113 outRect.set(mLeft, mTop, mRight, mBottom); 9114 } else { 9115 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9116 tmpRect.set(-info.mPivotX, -info.mPivotY, 9117 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9118 info.mMatrix.mapRect(tmpRect); 9119 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9120 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9121 } 9122 } 9123 9124 /** 9125 * Determines whether the given point, in local coordinates is inside the view. 9126 */ 9127 /*package*/ final boolean pointInView(float localX, float localY) { 9128 return localX >= 0 && localX < (mRight - mLeft) 9129 && localY >= 0 && localY < (mBottom - mTop); 9130 } 9131 9132 /** 9133 * Utility method to determine whether the given point, in local coordinates, 9134 * is inside the view, where the area of the view is expanded by the slop factor. 9135 * This method is called while processing touch-move events to determine if the event 9136 * is still within the view. 9137 */ 9138 private boolean pointInView(float localX, float localY, float slop) { 9139 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9140 localY < ((mBottom - mTop) + slop); 9141 } 9142 9143 /** 9144 * When a view has focus and the user navigates away from it, the next view is searched for 9145 * starting from the rectangle filled in by this method. 9146 * 9147 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9148 * of the view. However, if your view maintains some idea of internal selection, 9149 * such as a cursor, or a selected row or column, you should override this method and 9150 * fill in a more specific rectangle. 9151 * 9152 * @param r The rectangle to fill in, in this view's coordinates. 9153 */ 9154 public void getFocusedRect(Rect r) { 9155 getDrawingRect(r); 9156 } 9157 9158 /** 9159 * If some part of this view is not clipped by any of its parents, then 9160 * return that area in r in global (root) coordinates. To convert r to local 9161 * coordinates (without taking possible View rotations into account), offset 9162 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9163 * If the view is completely clipped or translated out, return false. 9164 * 9165 * @param r If true is returned, r holds the global coordinates of the 9166 * visible portion of this view. 9167 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9168 * between this view and its root. globalOffet may be null. 9169 * @return true if r is non-empty (i.e. part of the view is visible at the 9170 * root level. 9171 */ 9172 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9173 int width = mRight - mLeft; 9174 int height = mBottom - mTop; 9175 if (width > 0 && height > 0) { 9176 r.set(0, 0, width, height); 9177 if (globalOffset != null) { 9178 globalOffset.set(-mScrollX, -mScrollY); 9179 } 9180 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9181 } 9182 return false; 9183 } 9184 9185 public final boolean getGlobalVisibleRect(Rect r) { 9186 return getGlobalVisibleRect(r, null); 9187 } 9188 9189 public final boolean getLocalVisibleRect(Rect r) { 9190 Point offset = new Point(); 9191 if (getGlobalVisibleRect(r, offset)) { 9192 r.offset(-offset.x, -offset.y); // make r local 9193 return true; 9194 } 9195 return false; 9196 } 9197 9198 /** 9199 * Offset this view's vertical location by the specified number of pixels. 9200 * 9201 * @param offset the number of pixels to offset the view by 9202 */ 9203 public void offsetTopAndBottom(int offset) { 9204 if (offset != 0) { 9205 updateMatrix(); 9206 final boolean matrixIsIdentity = mTransformationInfo == null 9207 || mTransformationInfo.mMatrixIsIdentity; 9208 if (matrixIsIdentity) { 9209 if (mDisplayList != null) { 9210 invalidateViewProperty(false, false); 9211 } else { 9212 final ViewParent p = mParent; 9213 if (p != null && mAttachInfo != null) { 9214 final Rect r = mAttachInfo.mTmpInvalRect; 9215 int minTop; 9216 int maxBottom; 9217 int yLoc; 9218 if (offset < 0) { 9219 minTop = mTop + offset; 9220 maxBottom = mBottom; 9221 yLoc = offset; 9222 } else { 9223 minTop = mTop; 9224 maxBottom = mBottom + offset; 9225 yLoc = 0; 9226 } 9227 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9228 p.invalidateChild(this, r); 9229 } 9230 } 9231 } else { 9232 invalidateViewProperty(false, false); 9233 } 9234 9235 mTop += offset; 9236 mBottom += offset; 9237 if (mDisplayList != null) { 9238 mDisplayList.offsetTopBottom(offset); 9239 invalidateViewProperty(false, false); 9240 } else { 9241 if (!matrixIsIdentity) { 9242 invalidateViewProperty(false, true); 9243 } 9244 invalidateParentIfNeeded(); 9245 } 9246 } 9247 } 9248 9249 /** 9250 * Offset this view's horizontal location by the specified amount of pixels. 9251 * 9252 * @param offset the numer of pixels to offset the view by 9253 */ 9254 public void offsetLeftAndRight(int offset) { 9255 if (offset != 0) { 9256 updateMatrix(); 9257 final boolean matrixIsIdentity = mTransformationInfo == null 9258 || mTransformationInfo.mMatrixIsIdentity; 9259 if (matrixIsIdentity) { 9260 if (mDisplayList != null) { 9261 invalidateViewProperty(false, false); 9262 } else { 9263 final ViewParent p = mParent; 9264 if (p != null && mAttachInfo != null) { 9265 final Rect r = mAttachInfo.mTmpInvalRect; 9266 int minLeft; 9267 int maxRight; 9268 if (offset < 0) { 9269 minLeft = mLeft + offset; 9270 maxRight = mRight; 9271 } else { 9272 minLeft = mLeft; 9273 maxRight = mRight + offset; 9274 } 9275 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9276 p.invalidateChild(this, r); 9277 } 9278 } 9279 } else { 9280 invalidateViewProperty(false, false); 9281 } 9282 9283 mLeft += offset; 9284 mRight += offset; 9285 if (mDisplayList != null) { 9286 mDisplayList.offsetLeftRight(offset); 9287 invalidateViewProperty(false, false); 9288 } else { 9289 if (!matrixIsIdentity) { 9290 invalidateViewProperty(false, true); 9291 } 9292 invalidateParentIfNeeded(); 9293 } 9294 } 9295 } 9296 9297 /** 9298 * Get the LayoutParams associated with this view. All views should have 9299 * layout parameters. These supply parameters to the <i>parent</i> of this 9300 * view specifying how it should be arranged. There are many subclasses of 9301 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9302 * of ViewGroup that are responsible for arranging their children. 9303 * 9304 * This method may return null if this View is not attached to a parent 9305 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9306 * was not invoked successfully. When a View is attached to a parent 9307 * ViewGroup, this method must not return null. 9308 * 9309 * @return The LayoutParams associated with this view, or null if no 9310 * parameters have been set yet 9311 */ 9312 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9313 public ViewGroup.LayoutParams getLayoutParams() { 9314 return mLayoutParams; 9315 } 9316 9317 /** 9318 * Set the layout parameters associated with this view. These supply 9319 * parameters to the <i>parent</i> of this view specifying how it should be 9320 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9321 * correspond to the different subclasses of ViewGroup that are responsible 9322 * for arranging their children. 9323 * 9324 * @param params The layout parameters for this view, cannot be null 9325 */ 9326 public void setLayoutParams(ViewGroup.LayoutParams params) { 9327 if (params == null) { 9328 throw new NullPointerException("Layout parameters cannot be null"); 9329 } 9330 mLayoutParams = params; 9331 if (mParent instanceof ViewGroup) { 9332 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9333 } 9334 requestLayout(); 9335 } 9336 9337 /** 9338 * Set the scrolled position of your view. This will cause a call to 9339 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9340 * invalidated. 9341 * @param x the x position to scroll to 9342 * @param y the y position to scroll to 9343 */ 9344 public void scrollTo(int x, int y) { 9345 if (mScrollX != x || mScrollY != y) { 9346 int oldX = mScrollX; 9347 int oldY = mScrollY; 9348 mScrollX = x; 9349 mScrollY = y; 9350 invalidateParentCaches(); 9351 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9352 if (!awakenScrollBars()) { 9353 postInvalidateOnAnimation(); 9354 } 9355 } 9356 } 9357 9358 /** 9359 * Move the scrolled position of your view. This will cause a call to 9360 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9361 * invalidated. 9362 * @param x the amount of pixels to scroll by horizontally 9363 * @param y the amount of pixels to scroll by vertically 9364 */ 9365 public void scrollBy(int x, int y) { 9366 scrollTo(mScrollX + x, mScrollY + y); 9367 } 9368 9369 /** 9370 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9371 * animation to fade the scrollbars out after a default delay. If a subclass 9372 * provides animated scrolling, the start delay should equal the duration 9373 * of the scrolling animation.</p> 9374 * 9375 * <p>The animation starts only if at least one of the scrollbars is 9376 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9377 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9378 * this method returns true, and false otherwise. If the animation is 9379 * started, this method calls {@link #invalidate()}; in that case the 9380 * caller should not call {@link #invalidate()}.</p> 9381 * 9382 * <p>This method should be invoked every time a subclass directly updates 9383 * the scroll parameters.</p> 9384 * 9385 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9386 * and {@link #scrollTo(int, int)}.</p> 9387 * 9388 * @return true if the animation is played, false otherwise 9389 * 9390 * @see #awakenScrollBars(int) 9391 * @see #scrollBy(int, int) 9392 * @see #scrollTo(int, int) 9393 * @see #isHorizontalScrollBarEnabled() 9394 * @see #isVerticalScrollBarEnabled() 9395 * @see #setHorizontalScrollBarEnabled(boolean) 9396 * @see #setVerticalScrollBarEnabled(boolean) 9397 */ 9398 protected boolean awakenScrollBars() { 9399 return mScrollCache != null && 9400 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9401 } 9402 9403 /** 9404 * Trigger the scrollbars to draw. 9405 * This method differs from awakenScrollBars() only in its default duration. 9406 * initialAwakenScrollBars() will show the scroll bars for longer than 9407 * usual to give the user more of a chance to notice them. 9408 * 9409 * @return true if the animation is played, false otherwise. 9410 */ 9411 private boolean initialAwakenScrollBars() { 9412 return mScrollCache != null && 9413 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9414 } 9415 9416 /** 9417 * <p> 9418 * Trigger the scrollbars to draw. When invoked this method starts an 9419 * animation to fade the scrollbars out after a fixed delay. If a subclass 9420 * provides animated scrolling, the start delay should equal the duration of 9421 * the scrolling animation. 9422 * </p> 9423 * 9424 * <p> 9425 * The animation starts only if at least one of the scrollbars is enabled, 9426 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9427 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9428 * this method returns true, and false otherwise. If the animation is 9429 * started, this method calls {@link #invalidate()}; in that case the caller 9430 * should not call {@link #invalidate()}. 9431 * </p> 9432 * 9433 * <p> 9434 * This method should be invoked everytime a subclass directly updates the 9435 * scroll parameters. 9436 * </p> 9437 * 9438 * @param startDelay the delay, in milliseconds, after which the animation 9439 * should start; when the delay is 0, the animation starts 9440 * immediately 9441 * @return true if the animation is played, false otherwise 9442 * 9443 * @see #scrollBy(int, int) 9444 * @see #scrollTo(int, int) 9445 * @see #isHorizontalScrollBarEnabled() 9446 * @see #isVerticalScrollBarEnabled() 9447 * @see #setHorizontalScrollBarEnabled(boolean) 9448 * @see #setVerticalScrollBarEnabled(boolean) 9449 */ 9450 protected boolean awakenScrollBars(int startDelay) { 9451 return awakenScrollBars(startDelay, true); 9452 } 9453 9454 /** 9455 * <p> 9456 * Trigger the scrollbars to draw. When invoked this method starts an 9457 * animation to fade the scrollbars out after a fixed delay. If a subclass 9458 * provides animated scrolling, the start delay should equal the duration of 9459 * the scrolling animation. 9460 * </p> 9461 * 9462 * <p> 9463 * The animation starts only if at least one of the scrollbars is enabled, 9464 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9465 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9466 * this method returns true, and false otherwise. If the animation is 9467 * started, this method calls {@link #invalidate()} if the invalidate parameter 9468 * is set to true; in that case the caller 9469 * should not call {@link #invalidate()}. 9470 * </p> 9471 * 9472 * <p> 9473 * This method should be invoked everytime a subclass directly updates the 9474 * scroll parameters. 9475 * </p> 9476 * 9477 * @param startDelay the delay, in milliseconds, after which the animation 9478 * should start; when the delay is 0, the animation starts 9479 * immediately 9480 * 9481 * @param invalidate Wheter this method should call invalidate 9482 * 9483 * @return true if the animation is played, false otherwise 9484 * 9485 * @see #scrollBy(int, int) 9486 * @see #scrollTo(int, int) 9487 * @see #isHorizontalScrollBarEnabled() 9488 * @see #isVerticalScrollBarEnabled() 9489 * @see #setHorizontalScrollBarEnabled(boolean) 9490 * @see #setVerticalScrollBarEnabled(boolean) 9491 */ 9492 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9493 final ScrollabilityCache scrollCache = mScrollCache; 9494 9495 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9496 return false; 9497 } 9498 9499 if (scrollCache.scrollBar == null) { 9500 scrollCache.scrollBar = new ScrollBarDrawable(); 9501 } 9502 9503 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9504 9505 if (invalidate) { 9506 // Invalidate to show the scrollbars 9507 postInvalidateOnAnimation(); 9508 } 9509 9510 if (scrollCache.state == ScrollabilityCache.OFF) { 9511 // FIXME: this is copied from WindowManagerService. 9512 // We should get this value from the system when it 9513 // is possible to do so. 9514 final int KEY_REPEAT_FIRST_DELAY = 750; 9515 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9516 } 9517 9518 // Tell mScrollCache when we should start fading. This may 9519 // extend the fade start time if one was already scheduled 9520 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9521 scrollCache.fadeStartTime = fadeStartTime; 9522 scrollCache.state = ScrollabilityCache.ON; 9523 9524 // Schedule our fader to run, unscheduling any old ones first 9525 if (mAttachInfo != null) { 9526 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9527 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9528 } 9529 9530 return true; 9531 } 9532 9533 return false; 9534 } 9535 9536 /** 9537 * Do not invalidate views which are not visible and which are not running an animation. They 9538 * will not get drawn and they should not set dirty flags as if they will be drawn 9539 */ 9540 private boolean skipInvalidate() { 9541 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9542 (!(mParent instanceof ViewGroup) || 9543 !((ViewGroup) mParent).isViewTransitioning(this)); 9544 } 9545 /** 9546 * Mark the area defined by dirty as needing to be drawn. If the view is 9547 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9548 * in the future. This must be called from a UI thread. To call from a non-UI 9549 * thread, call {@link #postInvalidate()}. 9550 * 9551 * WARNING: This method is destructive to dirty. 9552 * @param dirty the rectangle representing the bounds of the dirty region 9553 */ 9554 public void invalidate(Rect dirty) { 9555 if (ViewDebug.TRACE_HIERARCHY) { 9556 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9557 } 9558 9559 if (skipInvalidate()) { 9560 return; 9561 } 9562 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9563 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9564 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9565 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9566 mPrivateFlags |= INVALIDATED; 9567 mPrivateFlags |= DIRTY; 9568 final ViewParent p = mParent; 9569 final AttachInfo ai = mAttachInfo; 9570 //noinspection PointlessBooleanExpression,ConstantConditions 9571 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9572 if (p != null && ai != null && ai.mHardwareAccelerated) { 9573 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9574 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9575 p.invalidateChild(this, null); 9576 return; 9577 } 9578 } 9579 if (p != null && ai != null) { 9580 final int scrollX = mScrollX; 9581 final int scrollY = mScrollY; 9582 final Rect r = ai.mTmpInvalRect; 9583 r.set(dirty.left - scrollX, dirty.top - scrollY, 9584 dirty.right - scrollX, dirty.bottom - scrollY); 9585 mParent.invalidateChild(this, r); 9586 } 9587 } 9588 } 9589 9590 /** 9591 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9592 * The coordinates of the dirty rect are relative to the view. 9593 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9594 * will be called at some point in the future. This must be called from 9595 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9596 * @param l the left position of the dirty region 9597 * @param t the top position of the dirty region 9598 * @param r the right position of the dirty region 9599 * @param b the bottom position of the dirty region 9600 */ 9601 public void invalidate(int l, int t, int r, int b) { 9602 if (ViewDebug.TRACE_HIERARCHY) { 9603 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9604 } 9605 9606 if (skipInvalidate()) { 9607 return; 9608 } 9609 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9610 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9611 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9612 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9613 mPrivateFlags |= INVALIDATED; 9614 mPrivateFlags |= DIRTY; 9615 final ViewParent p = mParent; 9616 final AttachInfo ai = mAttachInfo; 9617 //noinspection PointlessBooleanExpression,ConstantConditions 9618 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9619 if (p != null && ai != null && ai.mHardwareAccelerated) { 9620 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9621 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9622 p.invalidateChild(this, null); 9623 return; 9624 } 9625 } 9626 if (p != null && ai != null && l < r && t < b) { 9627 final int scrollX = mScrollX; 9628 final int scrollY = mScrollY; 9629 final Rect tmpr = ai.mTmpInvalRect; 9630 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9631 p.invalidateChild(this, tmpr); 9632 } 9633 } 9634 } 9635 9636 /** 9637 * Invalidate the whole view. If the view is visible, 9638 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9639 * the future. This must be called from a UI thread. To call from a non-UI thread, 9640 * call {@link #postInvalidate()}. 9641 */ 9642 public void invalidate() { 9643 invalidate(true); 9644 } 9645 9646 /** 9647 * This is where the invalidate() work actually happens. A full invalidate() 9648 * causes the drawing cache to be invalidated, but this function can be called with 9649 * invalidateCache set to false to skip that invalidation step for cases that do not 9650 * need it (for example, a component that remains at the same dimensions with the same 9651 * content). 9652 * 9653 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9654 * well. This is usually true for a full invalidate, but may be set to false if the 9655 * View's contents or dimensions have not changed. 9656 */ 9657 void invalidate(boolean invalidateCache) { 9658 if (ViewDebug.TRACE_HIERARCHY) { 9659 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9660 } 9661 9662 if (skipInvalidate()) { 9663 return; 9664 } 9665 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9666 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9667 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9668 mLastIsOpaque = isOpaque(); 9669 mPrivateFlags &= ~DRAWN; 9670 mPrivateFlags |= DIRTY; 9671 if (invalidateCache) { 9672 mPrivateFlags |= INVALIDATED; 9673 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9674 } 9675 final AttachInfo ai = mAttachInfo; 9676 final ViewParent p = mParent; 9677 //noinspection PointlessBooleanExpression,ConstantConditions 9678 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9679 if (p != null && ai != null && ai.mHardwareAccelerated) { 9680 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9681 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9682 p.invalidateChild(this, null); 9683 return; 9684 } 9685 } 9686 9687 if (p != null && ai != null) { 9688 final Rect r = ai.mTmpInvalRect; 9689 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9690 // Don't call invalidate -- we don't want to internally scroll 9691 // our own bounds 9692 p.invalidateChild(this, r); 9693 } 9694 } 9695 } 9696 9697 /** 9698 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 9699 * set any flags or handle all of the cases handled by the default invalidation methods. 9700 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 9701 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 9702 * walk up the hierarchy, transforming the dirty rect as necessary. 9703 * 9704 * The method also handles normal invalidation logic if display list properties are not 9705 * being used in this view. The invalidateParent and forceRedraw flags are used by that 9706 * backup approach, to handle these cases used in the various property-setting methods. 9707 * 9708 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 9709 * are not being used in this view 9710 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 9711 * list properties are not being used in this view 9712 */ 9713 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 9714 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 9715 if (invalidateParent) { 9716 invalidateParentCaches(); 9717 } 9718 if (forceRedraw) { 9719 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9720 } 9721 invalidate(false); 9722 } else { 9723 final AttachInfo ai = mAttachInfo; 9724 final ViewParent p = mParent; 9725 if (p != null && ai != null) { 9726 final Rect r = ai.mTmpInvalRect; 9727 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9728 if (mParent instanceof ViewGroup) { 9729 ((ViewGroup) mParent).invalidateChildFast(this, r); 9730 } else { 9731 mParent.invalidateChild(this, r); 9732 } 9733 } 9734 } 9735 } 9736 9737 /** 9738 * Utility method to transform a given Rect by the current matrix of this view. 9739 */ 9740 void transformRect(final Rect rect) { 9741 if (!getMatrix().isIdentity()) { 9742 RectF boundingRect = mAttachInfo.mTmpTransformRect; 9743 boundingRect.set(rect); 9744 getMatrix().mapRect(boundingRect); 9745 rect.set((int) (boundingRect.left - 0.5f), 9746 (int) (boundingRect.top - 0.5f), 9747 (int) (boundingRect.right + 0.5f), 9748 (int) (boundingRect.bottom + 0.5f)); 9749 } 9750 } 9751 9752 /** 9753 * Used to indicate that the parent of this view should clear its caches. This functionality 9754 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9755 * which is necessary when various parent-managed properties of the view change, such as 9756 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 9757 * clears the parent caches and does not causes an invalidate event. 9758 * 9759 * @hide 9760 */ 9761 protected void invalidateParentCaches() { 9762 if (mParent instanceof View) { 9763 ((View) mParent).mPrivateFlags |= INVALIDATED; 9764 } 9765 } 9766 9767 /** 9768 * Used to indicate that the parent of this view should be invalidated. This functionality 9769 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9770 * which is necessary when various parent-managed properties of the view change, such as 9771 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 9772 * an invalidation event to the parent. 9773 * 9774 * @hide 9775 */ 9776 protected void invalidateParentIfNeeded() { 9777 if (isHardwareAccelerated() && mParent instanceof View) { 9778 ((View) mParent).invalidate(true); 9779 } 9780 } 9781 9782 /** 9783 * Indicates whether this View is opaque. An opaque View guarantees that it will 9784 * draw all the pixels overlapping its bounds using a fully opaque color. 9785 * 9786 * Subclasses of View should override this method whenever possible to indicate 9787 * whether an instance is opaque. Opaque Views are treated in a special way by 9788 * the View hierarchy, possibly allowing it to perform optimizations during 9789 * invalidate/draw passes. 9790 * 9791 * @return True if this View is guaranteed to be fully opaque, false otherwise. 9792 */ 9793 @ViewDebug.ExportedProperty(category = "drawing") 9794 public boolean isOpaque() { 9795 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 9796 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 9797 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 9798 } 9799 9800 /** 9801 * @hide 9802 */ 9803 protected void computeOpaqueFlags() { 9804 // Opaque if: 9805 // - Has a background 9806 // - Background is opaque 9807 // - Doesn't have scrollbars or scrollbars are inside overlay 9808 9809 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 9810 mPrivateFlags |= OPAQUE_BACKGROUND; 9811 } else { 9812 mPrivateFlags &= ~OPAQUE_BACKGROUND; 9813 } 9814 9815 final int flags = mViewFlags; 9816 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 9817 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 9818 mPrivateFlags |= OPAQUE_SCROLLBARS; 9819 } else { 9820 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 9821 } 9822 } 9823 9824 /** 9825 * @hide 9826 */ 9827 protected boolean hasOpaqueScrollbars() { 9828 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 9829 } 9830 9831 /** 9832 * @return A handler associated with the thread running the View. This 9833 * handler can be used to pump events in the UI events queue. 9834 */ 9835 public Handler getHandler() { 9836 if (mAttachInfo != null) { 9837 return mAttachInfo.mHandler; 9838 } 9839 return null; 9840 } 9841 9842 /** 9843 * Gets the view root associated with the View. 9844 * @return The view root, or null if none. 9845 * @hide 9846 */ 9847 public ViewRootImpl getViewRootImpl() { 9848 if (mAttachInfo != null) { 9849 return mAttachInfo.mViewRootImpl; 9850 } 9851 return null; 9852 } 9853 9854 /** 9855 * <p>Causes the Runnable to be added to the message queue. 9856 * The runnable will be run on the user interface thread.</p> 9857 * 9858 * <p>This method can be invoked from outside of the UI thread 9859 * only when this View is attached to a window.</p> 9860 * 9861 * @param action The Runnable that will be executed. 9862 * 9863 * @return Returns true if the Runnable was successfully placed in to the 9864 * message queue. Returns false on failure, usually because the 9865 * looper processing the message queue is exiting. 9866 * 9867 * @see #postDelayed 9868 * @see #removeCallbacks 9869 */ 9870 public boolean post(Runnable action) { 9871 final AttachInfo attachInfo = mAttachInfo; 9872 if (attachInfo != null) { 9873 return attachInfo.mHandler.post(action); 9874 } 9875 // Assume that post will succeed later 9876 ViewRootImpl.getRunQueue().post(action); 9877 return true; 9878 } 9879 9880 /** 9881 * <p>Causes the Runnable to be added to the message queue, to be run 9882 * after the specified amount of time elapses. 9883 * The runnable will be run on the user interface thread.</p> 9884 * 9885 * <p>This method can be invoked from outside of the UI thread 9886 * only when this View is attached to a window.</p> 9887 * 9888 * @param action The Runnable that will be executed. 9889 * @param delayMillis The delay (in milliseconds) until the Runnable 9890 * will be executed. 9891 * 9892 * @return true if the Runnable was successfully placed in to the 9893 * message queue. Returns false on failure, usually because the 9894 * looper processing the message queue is exiting. Note that a 9895 * result of true does not mean the Runnable will be processed -- 9896 * if the looper is quit before the delivery time of the message 9897 * occurs then the message will be dropped. 9898 * 9899 * @see #post 9900 * @see #removeCallbacks 9901 */ 9902 public boolean postDelayed(Runnable action, long delayMillis) { 9903 final AttachInfo attachInfo = mAttachInfo; 9904 if (attachInfo != null) { 9905 return attachInfo.mHandler.postDelayed(action, delayMillis); 9906 } 9907 // Assume that post will succeed later 9908 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 9909 return true; 9910 } 9911 9912 /** 9913 * <p>Causes the Runnable to execute on the next animation time step. 9914 * The runnable will be run on the user interface thread.</p> 9915 * 9916 * <p>This method can be invoked from outside of the UI thread 9917 * only when this View is attached to a window.</p> 9918 * 9919 * @param action The Runnable that will be executed. 9920 * 9921 * @see #postOnAnimationDelayed 9922 * @see #removeCallbacks 9923 */ 9924 public void postOnAnimation(Runnable action) { 9925 final AttachInfo attachInfo = mAttachInfo; 9926 if (attachInfo != null) { 9927 attachInfo.mViewRootImpl.mChoreographer.postCallback( 9928 Choreographer.CALLBACK_ANIMATION, action, null); 9929 } else { 9930 // Assume that post will succeed later 9931 ViewRootImpl.getRunQueue().post(action); 9932 } 9933 } 9934 9935 /** 9936 * <p>Causes the Runnable to execute on the next animation time step, 9937 * after the specified amount of time elapses. 9938 * The runnable will be run on the user interface thread.</p> 9939 * 9940 * <p>This method can be invoked from outside of the UI thread 9941 * only when this View is attached to a window.</p> 9942 * 9943 * @param action The Runnable that will be executed. 9944 * @param delayMillis The delay (in milliseconds) until the Runnable 9945 * will be executed. 9946 * 9947 * @see #postOnAnimation 9948 * @see #removeCallbacks 9949 */ 9950 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 9951 final AttachInfo attachInfo = mAttachInfo; 9952 if (attachInfo != null) { 9953 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 9954 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 9955 } else { 9956 // Assume that post will succeed later 9957 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 9958 } 9959 } 9960 9961 /** 9962 * <p>Removes the specified Runnable from the message queue.</p> 9963 * 9964 * <p>This method can be invoked from outside of the UI thread 9965 * only when this View is attached to a window.</p> 9966 * 9967 * @param action The Runnable to remove from the message handling queue 9968 * 9969 * @return true if this view could ask the Handler to remove the Runnable, 9970 * false otherwise. When the returned value is true, the Runnable 9971 * may or may not have been actually removed from the message queue 9972 * (for instance, if the Runnable was not in the queue already.) 9973 * 9974 * @see #post 9975 * @see #postDelayed 9976 * @see #postOnAnimation 9977 * @see #postOnAnimationDelayed 9978 */ 9979 public boolean removeCallbacks(Runnable action) { 9980 if (action != null) { 9981 final AttachInfo attachInfo = mAttachInfo; 9982 if (attachInfo != null) { 9983 attachInfo.mHandler.removeCallbacks(action); 9984 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 9985 Choreographer.CALLBACK_ANIMATION, action, null); 9986 } else { 9987 // Assume that post will succeed later 9988 ViewRootImpl.getRunQueue().removeCallbacks(action); 9989 } 9990 } 9991 return true; 9992 } 9993 9994 /** 9995 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 9996 * Use this to invalidate the View from a non-UI thread.</p> 9997 * 9998 * <p>This method can be invoked from outside of the UI thread 9999 * only when this View is attached to a window.</p> 10000 * 10001 * @see #invalidate() 10002 * @see #postInvalidateDelayed(long) 10003 */ 10004 public void postInvalidate() { 10005 postInvalidateDelayed(0); 10006 } 10007 10008 /** 10009 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10010 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 10011 * 10012 * <p>This method can be invoked from outside of the UI thread 10013 * only when this View is attached to a window.</p> 10014 * 10015 * @param left The left coordinate of the rectangle to invalidate. 10016 * @param top The top coordinate of the rectangle to invalidate. 10017 * @param right The right coordinate of the rectangle to invalidate. 10018 * @param bottom The bottom coordinate of the rectangle to invalidate. 10019 * 10020 * @see #invalidate(int, int, int, int) 10021 * @see #invalidate(Rect) 10022 * @see #postInvalidateDelayed(long, int, int, int, int) 10023 */ 10024 public void postInvalidate(int left, int top, int right, int bottom) { 10025 postInvalidateDelayed(0, left, top, right, bottom); 10026 } 10027 10028 /** 10029 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10030 * loop. Waits for the specified amount of time.</p> 10031 * 10032 * <p>This method can be invoked from outside of the UI thread 10033 * only when this View is attached to a window.</p> 10034 * 10035 * @param delayMilliseconds the duration in milliseconds to delay the 10036 * invalidation by 10037 * 10038 * @see #invalidate() 10039 * @see #postInvalidate() 10040 */ 10041 public void postInvalidateDelayed(long delayMilliseconds) { 10042 // We try only with the AttachInfo because there's no point in invalidating 10043 // if we are not attached to our window 10044 final AttachInfo attachInfo = mAttachInfo; 10045 if (attachInfo != null) { 10046 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10047 } 10048 } 10049 10050 /** 10051 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10052 * through the event loop. Waits for the specified amount of time.</p> 10053 * 10054 * <p>This method can be invoked from outside of the UI thread 10055 * only when this View is attached to a window.</p> 10056 * 10057 * @param delayMilliseconds the duration in milliseconds to delay the 10058 * invalidation by 10059 * @param left The left coordinate of the rectangle to invalidate. 10060 * @param top The top coordinate of the rectangle to invalidate. 10061 * @param right The right coordinate of the rectangle to invalidate. 10062 * @param bottom The bottom coordinate of the rectangle to invalidate. 10063 * 10064 * @see #invalidate(int, int, int, int) 10065 * @see #invalidate(Rect) 10066 * @see #postInvalidate(int, int, int, int) 10067 */ 10068 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10069 int right, int bottom) { 10070 10071 // We try only with the AttachInfo because there's no point in invalidating 10072 // if we are not attached to our window 10073 final AttachInfo attachInfo = mAttachInfo; 10074 if (attachInfo != null) { 10075 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10076 info.target = this; 10077 info.left = left; 10078 info.top = top; 10079 info.right = right; 10080 info.bottom = bottom; 10081 10082 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10083 } 10084 } 10085 10086 /** 10087 * <p>Cause an invalidate to happen on the next animation time step, typically the 10088 * next display frame.</p> 10089 * 10090 * <p>This method can be invoked from outside of the UI thread 10091 * only when this View is attached to a window.</p> 10092 * 10093 * @see #invalidate() 10094 */ 10095 public void postInvalidateOnAnimation() { 10096 // We try only with the AttachInfo because there's no point in invalidating 10097 // if we are not attached to our window 10098 final AttachInfo attachInfo = mAttachInfo; 10099 if (attachInfo != null) { 10100 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10101 } 10102 } 10103 10104 /** 10105 * <p>Cause an invalidate of the specified area to happen on the next animation 10106 * time step, typically the next display frame.</p> 10107 * 10108 * <p>This method can be invoked from outside of the UI thread 10109 * only when this View is attached to a window.</p> 10110 * 10111 * @param left The left coordinate of the rectangle to invalidate. 10112 * @param top The top coordinate of the rectangle to invalidate. 10113 * @param right The right coordinate of the rectangle to invalidate. 10114 * @param bottom The bottom coordinate of the rectangle to invalidate. 10115 * 10116 * @see #invalidate(int, int, int, int) 10117 * @see #invalidate(Rect) 10118 */ 10119 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10120 // We try only with the AttachInfo because there's no point in invalidating 10121 // if we are not attached to our window 10122 final AttachInfo attachInfo = mAttachInfo; 10123 if (attachInfo != null) { 10124 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10125 info.target = this; 10126 info.left = left; 10127 info.top = top; 10128 info.right = right; 10129 info.bottom = bottom; 10130 10131 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10132 } 10133 } 10134 10135 /** 10136 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10137 * This event is sent at most once every 10138 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10139 */ 10140 private void postSendViewScrolledAccessibilityEventCallback() { 10141 if (mSendViewScrolledAccessibilityEvent == null) { 10142 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10143 } 10144 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10145 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10146 postDelayed(mSendViewScrolledAccessibilityEvent, 10147 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10148 } 10149 } 10150 10151 /** 10152 * Called by a parent to request that a child update its values for mScrollX 10153 * and mScrollY if necessary. This will typically be done if the child is 10154 * animating a scroll using a {@link android.widget.Scroller Scroller} 10155 * object. 10156 */ 10157 public void computeScroll() { 10158 } 10159 10160 /** 10161 * <p>Indicate whether the horizontal edges are faded when the view is 10162 * scrolled horizontally.</p> 10163 * 10164 * @return true if the horizontal edges should are faded on scroll, false 10165 * otherwise 10166 * 10167 * @see #setHorizontalFadingEdgeEnabled(boolean) 10168 * 10169 * @attr ref android.R.styleable#View_requiresFadingEdge 10170 */ 10171 public boolean isHorizontalFadingEdgeEnabled() { 10172 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10173 } 10174 10175 /** 10176 * <p>Define whether the horizontal edges should be faded when this view 10177 * is scrolled horizontally.</p> 10178 * 10179 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10180 * be faded when the view is scrolled 10181 * horizontally 10182 * 10183 * @see #isHorizontalFadingEdgeEnabled() 10184 * 10185 * @attr ref android.R.styleable#View_requiresFadingEdge 10186 */ 10187 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10188 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10189 if (horizontalFadingEdgeEnabled) { 10190 initScrollCache(); 10191 } 10192 10193 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10194 } 10195 } 10196 10197 /** 10198 * <p>Indicate whether the vertical edges are faded when the view is 10199 * scrolled horizontally.</p> 10200 * 10201 * @return true if the vertical edges should are faded on scroll, false 10202 * otherwise 10203 * 10204 * @see #setVerticalFadingEdgeEnabled(boolean) 10205 * 10206 * @attr ref android.R.styleable#View_requiresFadingEdge 10207 */ 10208 public boolean isVerticalFadingEdgeEnabled() { 10209 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10210 } 10211 10212 /** 10213 * <p>Define whether the vertical edges should be faded when this view 10214 * is scrolled vertically.</p> 10215 * 10216 * @param verticalFadingEdgeEnabled true if the vertical edges should 10217 * be faded when the view is scrolled 10218 * vertically 10219 * 10220 * @see #isVerticalFadingEdgeEnabled() 10221 * 10222 * @attr ref android.R.styleable#View_requiresFadingEdge 10223 */ 10224 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10225 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10226 if (verticalFadingEdgeEnabled) { 10227 initScrollCache(); 10228 } 10229 10230 mViewFlags ^= FADING_EDGE_VERTICAL; 10231 } 10232 } 10233 10234 /** 10235 * Returns the strength, or intensity, of the top faded edge. The strength is 10236 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10237 * returns 0.0 or 1.0 but no value in between. 10238 * 10239 * Subclasses should override this method to provide a smoother fade transition 10240 * when scrolling occurs. 10241 * 10242 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10243 */ 10244 protected float getTopFadingEdgeStrength() { 10245 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10246 } 10247 10248 /** 10249 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10250 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10251 * returns 0.0 or 1.0 but no value in between. 10252 * 10253 * Subclasses should override this method to provide a smoother fade transition 10254 * when scrolling occurs. 10255 * 10256 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10257 */ 10258 protected float getBottomFadingEdgeStrength() { 10259 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10260 computeVerticalScrollRange() ? 1.0f : 0.0f; 10261 } 10262 10263 /** 10264 * Returns the strength, or intensity, of the left faded edge. The strength is 10265 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10266 * returns 0.0 or 1.0 but no value in between. 10267 * 10268 * Subclasses should override this method to provide a smoother fade transition 10269 * when scrolling occurs. 10270 * 10271 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10272 */ 10273 protected float getLeftFadingEdgeStrength() { 10274 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10275 } 10276 10277 /** 10278 * Returns the strength, or intensity, of the right faded edge. The strength is 10279 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10280 * returns 0.0 or 1.0 but no value in between. 10281 * 10282 * Subclasses should override this method to provide a smoother fade transition 10283 * when scrolling occurs. 10284 * 10285 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10286 */ 10287 protected float getRightFadingEdgeStrength() { 10288 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10289 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10290 } 10291 10292 /** 10293 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10294 * scrollbar is not drawn by default.</p> 10295 * 10296 * @return true if the horizontal scrollbar should be painted, false 10297 * otherwise 10298 * 10299 * @see #setHorizontalScrollBarEnabled(boolean) 10300 */ 10301 public boolean isHorizontalScrollBarEnabled() { 10302 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10303 } 10304 10305 /** 10306 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10307 * scrollbar is not drawn by default.</p> 10308 * 10309 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10310 * be painted 10311 * 10312 * @see #isHorizontalScrollBarEnabled() 10313 */ 10314 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10315 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10316 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10317 computeOpaqueFlags(); 10318 resolvePadding(); 10319 } 10320 } 10321 10322 /** 10323 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10324 * scrollbar is not drawn by default.</p> 10325 * 10326 * @return true if the vertical scrollbar should be painted, false 10327 * otherwise 10328 * 10329 * @see #setVerticalScrollBarEnabled(boolean) 10330 */ 10331 public boolean isVerticalScrollBarEnabled() { 10332 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10333 } 10334 10335 /** 10336 * <p>Define whether the vertical scrollbar should be drawn or not. The 10337 * scrollbar is not drawn by default.</p> 10338 * 10339 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10340 * be painted 10341 * 10342 * @see #isVerticalScrollBarEnabled() 10343 */ 10344 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10345 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10346 mViewFlags ^= SCROLLBARS_VERTICAL; 10347 computeOpaqueFlags(); 10348 resolvePadding(); 10349 } 10350 } 10351 10352 /** 10353 * @hide 10354 */ 10355 protected void recomputePadding() { 10356 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10357 } 10358 10359 /** 10360 * Define whether scrollbars will fade when the view is not scrolling. 10361 * 10362 * @param fadeScrollbars wheter to enable fading 10363 * 10364 * @attr ref android.R.styleable#View_fadeScrollbars 10365 */ 10366 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10367 initScrollCache(); 10368 final ScrollabilityCache scrollabilityCache = mScrollCache; 10369 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10370 if (fadeScrollbars) { 10371 scrollabilityCache.state = ScrollabilityCache.OFF; 10372 } else { 10373 scrollabilityCache.state = ScrollabilityCache.ON; 10374 } 10375 } 10376 10377 /** 10378 * 10379 * Returns true if scrollbars will fade when this view is not scrolling 10380 * 10381 * @return true if scrollbar fading is enabled 10382 * 10383 * @attr ref android.R.styleable#View_fadeScrollbars 10384 */ 10385 public boolean isScrollbarFadingEnabled() { 10386 return mScrollCache != null && mScrollCache.fadeScrollBars; 10387 } 10388 10389 /** 10390 * 10391 * Returns the delay before scrollbars fade. 10392 * 10393 * @return the delay before scrollbars fade 10394 * 10395 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10396 */ 10397 public int getScrollBarDefaultDelayBeforeFade() { 10398 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10399 mScrollCache.scrollBarDefaultDelayBeforeFade; 10400 } 10401 10402 /** 10403 * Define the delay before scrollbars fade. 10404 * 10405 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10406 * 10407 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10408 */ 10409 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10410 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10411 } 10412 10413 /** 10414 * 10415 * Returns the scrollbar fade duration. 10416 * 10417 * @return the scrollbar fade duration 10418 * 10419 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10420 */ 10421 public int getScrollBarFadeDuration() { 10422 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10423 mScrollCache.scrollBarFadeDuration; 10424 } 10425 10426 /** 10427 * Define the scrollbar fade duration. 10428 * 10429 * @param scrollBarFadeDuration - the scrollbar fade duration 10430 * 10431 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10432 */ 10433 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10434 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10435 } 10436 10437 /** 10438 * 10439 * Returns the scrollbar size. 10440 * 10441 * @return the scrollbar size 10442 * 10443 * @attr ref android.R.styleable#View_scrollbarSize 10444 */ 10445 public int getScrollBarSize() { 10446 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10447 mScrollCache.scrollBarSize; 10448 } 10449 10450 /** 10451 * Define the scrollbar size. 10452 * 10453 * @param scrollBarSize - the scrollbar size 10454 * 10455 * @attr ref android.R.styleable#View_scrollbarSize 10456 */ 10457 public void setScrollBarSize(int scrollBarSize) { 10458 getScrollCache().scrollBarSize = scrollBarSize; 10459 } 10460 10461 /** 10462 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10463 * inset. When inset, they add to the padding of the view. And the scrollbars 10464 * can be drawn inside the padding area or on the edge of the view. For example, 10465 * if a view has a background drawable and you want to draw the scrollbars 10466 * inside the padding specified by the drawable, you can use 10467 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10468 * appear at the edge of the view, ignoring the padding, then you can use 10469 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10470 * @param style the style of the scrollbars. Should be one of 10471 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10472 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10473 * @see #SCROLLBARS_INSIDE_OVERLAY 10474 * @see #SCROLLBARS_INSIDE_INSET 10475 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10476 * @see #SCROLLBARS_OUTSIDE_INSET 10477 * 10478 * @attr ref android.R.styleable#View_scrollbarStyle 10479 */ 10480 public void setScrollBarStyle(int style) { 10481 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10482 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10483 computeOpaqueFlags(); 10484 resolvePadding(); 10485 } 10486 } 10487 10488 /** 10489 * <p>Returns the current scrollbar style.</p> 10490 * @return the current scrollbar style 10491 * @see #SCROLLBARS_INSIDE_OVERLAY 10492 * @see #SCROLLBARS_INSIDE_INSET 10493 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10494 * @see #SCROLLBARS_OUTSIDE_INSET 10495 * 10496 * @attr ref android.R.styleable#View_scrollbarStyle 10497 */ 10498 @ViewDebug.ExportedProperty(mapping = { 10499 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10500 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10501 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10502 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10503 }) 10504 public int getScrollBarStyle() { 10505 return mViewFlags & SCROLLBARS_STYLE_MASK; 10506 } 10507 10508 /** 10509 * <p>Compute the horizontal range that the horizontal scrollbar 10510 * represents.</p> 10511 * 10512 * <p>The range is expressed in arbitrary units that must be the same as the 10513 * units used by {@link #computeHorizontalScrollExtent()} and 10514 * {@link #computeHorizontalScrollOffset()}.</p> 10515 * 10516 * <p>The default range is the drawing width of this view.</p> 10517 * 10518 * @return the total horizontal range represented by the horizontal 10519 * scrollbar 10520 * 10521 * @see #computeHorizontalScrollExtent() 10522 * @see #computeHorizontalScrollOffset() 10523 * @see android.widget.ScrollBarDrawable 10524 */ 10525 protected int computeHorizontalScrollRange() { 10526 return getWidth(); 10527 } 10528 10529 /** 10530 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10531 * within the horizontal range. This value is used to compute the position 10532 * of the thumb within the scrollbar's track.</p> 10533 * 10534 * <p>The range is expressed in arbitrary units that must be the same as the 10535 * units used by {@link #computeHorizontalScrollRange()} and 10536 * {@link #computeHorizontalScrollExtent()}.</p> 10537 * 10538 * <p>The default offset is the scroll offset of this view.</p> 10539 * 10540 * @return the horizontal offset of the scrollbar's thumb 10541 * 10542 * @see #computeHorizontalScrollRange() 10543 * @see #computeHorizontalScrollExtent() 10544 * @see android.widget.ScrollBarDrawable 10545 */ 10546 protected int computeHorizontalScrollOffset() { 10547 return mScrollX; 10548 } 10549 10550 /** 10551 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10552 * within the horizontal range. This value is used to compute the length 10553 * of the thumb within the scrollbar's track.</p> 10554 * 10555 * <p>The range is expressed in arbitrary units that must be the same as the 10556 * units used by {@link #computeHorizontalScrollRange()} and 10557 * {@link #computeHorizontalScrollOffset()}.</p> 10558 * 10559 * <p>The default extent is the drawing width of this view.</p> 10560 * 10561 * @return the horizontal extent of the scrollbar's thumb 10562 * 10563 * @see #computeHorizontalScrollRange() 10564 * @see #computeHorizontalScrollOffset() 10565 * @see android.widget.ScrollBarDrawable 10566 */ 10567 protected int computeHorizontalScrollExtent() { 10568 return getWidth(); 10569 } 10570 10571 /** 10572 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10573 * 10574 * <p>The range is expressed in arbitrary units that must be the same as the 10575 * units used by {@link #computeVerticalScrollExtent()} and 10576 * {@link #computeVerticalScrollOffset()}.</p> 10577 * 10578 * @return the total vertical range represented by the vertical scrollbar 10579 * 10580 * <p>The default range is the drawing height of this view.</p> 10581 * 10582 * @see #computeVerticalScrollExtent() 10583 * @see #computeVerticalScrollOffset() 10584 * @see android.widget.ScrollBarDrawable 10585 */ 10586 protected int computeVerticalScrollRange() { 10587 return getHeight(); 10588 } 10589 10590 /** 10591 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10592 * within the horizontal range. This value is used to compute the position 10593 * of the thumb within the scrollbar's track.</p> 10594 * 10595 * <p>The range is expressed in arbitrary units that must be the same as the 10596 * units used by {@link #computeVerticalScrollRange()} and 10597 * {@link #computeVerticalScrollExtent()}.</p> 10598 * 10599 * <p>The default offset is the scroll offset of this view.</p> 10600 * 10601 * @return the vertical offset of the scrollbar's thumb 10602 * 10603 * @see #computeVerticalScrollRange() 10604 * @see #computeVerticalScrollExtent() 10605 * @see android.widget.ScrollBarDrawable 10606 */ 10607 protected int computeVerticalScrollOffset() { 10608 return mScrollY; 10609 } 10610 10611 /** 10612 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10613 * within the vertical range. This value is used to compute the length 10614 * of the thumb within the scrollbar's track.</p> 10615 * 10616 * <p>The range is expressed in arbitrary units that must be the same as the 10617 * units used by {@link #computeVerticalScrollRange()} and 10618 * {@link #computeVerticalScrollOffset()}.</p> 10619 * 10620 * <p>The default extent is the drawing height of this view.</p> 10621 * 10622 * @return the vertical extent of the scrollbar's thumb 10623 * 10624 * @see #computeVerticalScrollRange() 10625 * @see #computeVerticalScrollOffset() 10626 * @see android.widget.ScrollBarDrawable 10627 */ 10628 protected int computeVerticalScrollExtent() { 10629 return getHeight(); 10630 } 10631 10632 /** 10633 * Check if this view can be scrolled horizontally in a certain direction. 10634 * 10635 * @param direction Negative to check scrolling left, positive to check scrolling right. 10636 * @return true if this view can be scrolled in the specified direction, false otherwise. 10637 */ 10638 public boolean canScrollHorizontally(int direction) { 10639 final int offset = computeHorizontalScrollOffset(); 10640 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10641 if (range == 0) return false; 10642 if (direction < 0) { 10643 return offset > 0; 10644 } else { 10645 return offset < range - 1; 10646 } 10647 } 10648 10649 /** 10650 * Check if this view can be scrolled vertically in a certain direction. 10651 * 10652 * @param direction Negative to check scrolling up, positive to check scrolling down. 10653 * @return true if this view can be scrolled in the specified direction, false otherwise. 10654 */ 10655 public boolean canScrollVertically(int direction) { 10656 final int offset = computeVerticalScrollOffset(); 10657 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10658 if (range == 0) return false; 10659 if (direction < 0) { 10660 return offset > 0; 10661 } else { 10662 return offset < range - 1; 10663 } 10664 } 10665 10666 /** 10667 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10668 * scrollbars are painted only if they have been awakened first.</p> 10669 * 10670 * @param canvas the canvas on which to draw the scrollbars 10671 * 10672 * @see #awakenScrollBars(int) 10673 */ 10674 protected final void onDrawScrollBars(Canvas canvas) { 10675 // scrollbars are drawn only when the animation is running 10676 final ScrollabilityCache cache = mScrollCache; 10677 if (cache != null) { 10678 10679 int state = cache.state; 10680 10681 if (state == ScrollabilityCache.OFF) { 10682 return; 10683 } 10684 10685 boolean invalidate = false; 10686 10687 if (state == ScrollabilityCache.FADING) { 10688 // We're fading -- get our fade interpolation 10689 if (cache.interpolatorValues == null) { 10690 cache.interpolatorValues = new float[1]; 10691 } 10692 10693 float[] values = cache.interpolatorValues; 10694 10695 // Stops the animation if we're done 10696 if (cache.scrollBarInterpolator.timeToValues(values) == 10697 Interpolator.Result.FREEZE_END) { 10698 cache.state = ScrollabilityCache.OFF; 10699 } else { 10700 cache.scrollBar.setAlpha(Math.round(values[0])); 10701 } 10702 10703 // This will make the scroll bars inval themselves after 10704 // drawing. We only want this when we're fading so that 10705 // we prevent excessive redraws 10706 invalidate = true; 10707 } else { 10708 // We're just on -- but we may have been fading before so 10709 // reset alpha 10710 cache.scrollBar.setAlpha(255); 10711 } 10712 10713 10714 final int viewFlags = mViewFlags; 10715 10716 final boolean drawHorizontalScrollBar = 10717 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10718 final boolean drawVerticalScrollBar = 10719 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 10720 && !isVerticalScrollBarHidden(); 10721 10722 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 10723 final int width = mRight - mLeft; 10724 final int height = mBottom - mTop; 10725 10726 final ScrollBarDrawable scrollBar = cache.scrollBar; 10727 10728 final int scrollX = mScrollX; 10729 final int scrollY = mScrollY; 10730 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 10731 10732 int left, top, right, bottom; 10733 10734 if (drawHorizontalScrollBar) { 10735 int size = scrollBar.getSize(false); 10736 if (size <= 0) { 10737 size = cache.scrollBarSize; 10738 } 10739 10740 scrollBar.setParameters(computeHorizontalScrollRange(), 10741 computeHorizontalScrollOffset(), 10742 computeHorizontalScrollExtent(), false); 10743 final int verticalScrollBarGap = drawVerticalScrollBar ? 10744 getVerticalScrollbarWidth() : 0; 10745 top = scrollY + height - size - (mUserPaddingBottom & inside); 10746 left = scrollX + (mPaddingLeft & inside); 10747 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 10748 bottom = top + size; 10749 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 10750 if (invalidate) { 10751 invalidate(left, top, right, bottom); 10752 } 10753 } 10754 10755 if (drawVerticalScrollBar) { 10756 int size = scrollBar.getSize(true); 10757 if (size <= 0) { 10758 size = cache.scrollBarSize; 10759 } 10760 10761 scrollBar.setParameters(computeVerticalScrollRange(), 10762 computeVerticalScrollOffset(), 10763 computeVerticalScrollExtent(), true); 10764 switch (mVerticalScrollbarPosition) { 10765 default: 10766 case SCROLLBAR_POSITION_DEFAULT: 10767 case SCROLLBAR_POSITION_RIGHT: 10768 left = scrollX + width - size - (mUserPaddingRight & inside); 10769 break; 10770 case SCROLLBAR_POSITION_LEFT: 10771 left = scrollX + (mUserPaddingLeft & inside); 10772 break; 10773 } 10774 top = scrollY + (mPaddingTop & inside); 10775 right = left + size; 10776 bottom = scrollY + height - (mUserPaddingBottom & inside); 10777 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 10778 if (invalidate) { 10779 invalidate(left, top, right, bottom); 10780 } 10781 } 10782 } 10783 } 10784 } 10785 10786 /** 10787 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 10788 * FastScroller is visible. 10789 * @return whether to temporarily hide the vertical scrollbar 10790 * @hide 10791 */ 10792 protected boolean isVerticalScrollBarHidden() { 10793 return false; 10794 } 10795 10796 /** 10797 * <p>Draw the horizontal scrollbar if 10798 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 10799 * 10800 * @param canvas the canvas on which to draw the scrollbar 10801 * @param scrollBar the scrollbar's drawable 10802 * 10803 * @see #isHorizontalScrollBarEnabled() 10804 * @see #computeHorizontalScrollRange() 10805 * @see #computeHorizontalScrollExtent() 10806 * @see #computeHorizontalScrollOffset() 10807 * @see android.widget.ScrollBarDrawable 10808 * @hide 10809 */ 10810 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 10811 int l, int t, int r, int b) { 10812 scrollBar.setBounds(l, t, r, b); 10813 scrollBar.draw(canvas); 10814 } 10815 10816 /** 10817 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 10818 * returns true.</p> 10819 * 10820 * @param canvas the canvas on which to draw the scrollbar 10821 * @param scrollBar the scrollbar's drawable 10822 * 10823 * @see #isVerticalScrollBarEnabled() 10824 * @see #computeVerticalScrollRange() 10825 * @see #computeVerticalScrollExtent() 10826 * @see #computeVerticalScrollOffset() 10827 * @see android.widget.ScrollBarDrawable 10828 * @hide 10829 */ 10830 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 10831 int l, int t, int r, int b) { 10832 scrollBar.setBounds(l, t, r, b); 10833 scrollBar.draw(canvas); 10834 } 10835 10836 /** 10837 * Implement this to do your drawing. 10838 * 10839 * @param canvas the canvas on which the background will be drawn 10840 */ 10841 protected void onDraw(Canvas canvas) { 10842 } 10843 10844 /* 10845 * Caller is responsible for calling requestLayout if necessary. 10846 * (This allows addViewInLayout to not request a new layout.) 10847 */ 10848 void assignParent(ViewParent parent) { 10849 if (mParent == null) { 10850 mParent = parent; 10851 } else if (parent == null) { 10852 mParent = null; 10853 } else { 10854 throw new RuntimeException("view " + this + " being added, but" 10855 + " it already has a parent"); 10856 } 10857 } 10858 10859 /** 10860 * This is called when the view is attached to a window. At this point it 10861 * has a Surface and will start drawing. Note that this function is 10862 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 10863 * however it may be called any time before the first onDraw -- including 10864 * before or after {@link #onMeasure(int, int)}. 10865 * 10866 * @see #onDetachedFromWindow() 10867 */ 10868 protected void onAttachedToWindow() { 10869 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 10870 mParent.requestTransparentRegion(this); 10871 } 10872 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 10873 initialAwakenScrollBars(); 10874 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 10875 } 10876 jumpDrawablesToCurrentState(); 10877 // Order is important here: LayoutDirection MUST be resolved before Padding 10878 // and TextDirection 10879 resolveLayoutDirection(); 10880 resolvePadding(); 10881 resolveTextDirection(); 10882 resolveTextAlignment(); 10883 clearAccessibilityFocus(); 10884 if (isFocused()) { 10885 InputMethodManager imm = InputMethodManager.peekInstance(); 10886 imm.focusIn(this); 10887 } 10888 } 10889 10890 /** 10891 * @see #onScreenStateChanged(int) 10892 */ 10893 void dispatchScreenStateChanged(int screenState) { 10894 onScreenStateChanged(screenState); 10895 } 10896 10897 /** 10898 * This method is called whenever the state of the screen this view is 10899 * attached to changes. A state change will usually occurs when the screen 10900 * turns on or off (whether it happens automatically or the user does it 10901 * manually.) 10902 * 10903 * @param screenState The new state of the screen. Can be either 10904 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 10905 */ 10906 public void onScreenStateChanged(int screenState) { 10907 } 10908 10909 /** 10910 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 10911 */ 10912 private boolean hasRtlSupport() { 10913 return mContext.getApplicationInfo().hasRtlSupport(); 10914 } 10915 10916 /** 10917 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 10918 * that the parent directionality can and will be resolved before its children. 10919 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 10920 * @hide 10921 */ 10922 public void resolveLayoutDirection() { 10923 // Clear any previous layout direction resolution 10924 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 10925 10926 if (hasRtlSupport()) { 10927 // Set resolved depending on layout direction 10928 switch (getLayoutDirection()) { 10929 case LAYOUT_DIRECTION_INHERIT: 10930 // If this is root view, no need to look at parent's layout dir. 10931 if (canResolveLayoutDirection()) { 10932 ViewGroup viewGroup = ((ViewGroup) mParent); 10933 10934 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 10935 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10936 } 10937 } else { 10938 // Nothing to do, LTR by default 10939 } 10940 break; 10941 case LAYOUT_DIRECTION_RTL: 10942 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10943 break; 10944 case LAYOUT_DIRECTION_LOCALE: 10945 if(isLayoutDirectionRtl(Locale.getDefault())) { 10946 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10947 } 10948 break; 10949 default: 10950 // Nothing to do, LTR by default 10951 } 10952 } 10953 10954 // Set to resolved 10955 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 10956 onResolvedLayoutDirectionChanged(); 10957 // Resolve padding 10958 resolvePadding(); 10959 } 10960 10961 /** 10962 * Called when layout direction has been resolved. 10963 * 10964 * The default implementation does nothing. 10965 * @hide 10966 */ 10967 public void onResolvedLayoutDirectionChanged() { 10968 } 10969 10970 /** 10971 * Resolve padding depending on layout direction. 10972 * @hide 10973 */ 10974 public void resolvePadding() { 10975 // If the user specified the absolute padding (either with android:padding or 10976 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 10977 // use the default padding or the padding from the background drawable 10978 // (stored at this point in mPadding*) 10979 int resolvedLayoutDirection = getResolvedLayoutDirection(); 10980 switch (resolvedLayoutDirection) { 10981 case LAYOUT_DIRECTION_RTL: 10982 // Start user padding override Right user padding. Otherwise, if Right user 10983 // padding is not defined, use the default Right padding. If Right user padding 10984 // is defined, just use it. 10985 if (mUserPaddingStart >= 0) { 10986 mUserPaddingRight = mUserPaddingStart; 10987 } else if (mUserPaddingRight < 0) { 10988 mUserPaddingRight = mPaddingRight; 10989 } 10990 if (mUserPaddingEnd >= 0) { 10991 mUserPaddingLeft = mUserPaddingEnd; 10992 } else if (mUserPaddingLeft < 0) { 10993 mUserPaddingLeft = mPaddingLeft; 10994 } 10995 break; 10996 case LAYOUT_DIRECTION_LTR: 10997 default: 10998 // Start user padding override Left user padding. Otherwise, if Left user 10999 // padding is not defined, use the default left padding. If Left user padding 11000 // is defined, just use it. 11001 if (mUserPaddingStart >= 0) { 11002 mUserPaddingLeft = mUserPaddingStart; 11003 } else if (mUserPaddingLeft < 0) { 11004 mUserPaddingLeft = mPaddingLeft; 11005 } 11006 if (mUserPaddingEnd >= 0) { 11007 mUserPaddingRight = mUserPaddingEnd; 11008 } else if (mUserPaddingRight < 0) { 11009 mUserPaddingRight = mPaddingRight; 11010 } 11011 } 11012 11013 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 11014 11015 if(isPaddingRelative()) { 11016 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 11017 } else { 11018 recomputePadding(); 11019 } 11020 onPaddingChanged(resolvedLayoutDirection); 11021 } 11022 11023 /** 11024 * Resolve padding depending on the layout direction. Subclasses that care about 11025 * padding resolution should override this method. The default implementation does 11026 * nothing. 11027 * 11028 * @param layoutDirection the direction of the layout 11029 * 11030 * @see {@link #LAYOUT_DIRECTION_LTR} 11031 * @see {@link #LAYOUT_DIRECTION_RTL} 11032 * @hide 11033 */ 11034 public void onPaddingChanged(int layoutDirection) { 11035 } 11036 11037 /** 11038 * Check if layout direction resolution can be done. 11039 * 11040 * @return true if layout direction resolution can be done otherwise return false. 11041 * @hide 11042 */ 11043 public boolean canResolveLayoutDirection() { 11044 switch (getLayoutDirection()) { 11045 case LAYOUT_DIRECTION_INHERIT: 11046 return (mParent != null) && (mParent instanceof ViewGroup); 11047 default: 11048 return true; 11049 } 11050 } 11051 11052 /** 11053 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11054 * when reset is done. 11055 * @hide 11056 */ 11057 public void resetResolvedLayoutDirection() { 11058 // Reset the current resolved bits 11059 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11060 onResolvedLayoutDirectionReset(); 11061 // Reset also the text direction 11062 resetResolvedTextDirection(); 11063 } 11064 11065 /** 11066 * Called during reset of resolved layout direction. 11067 * 11068 * Subclasses need to override this method to clear cached information that depends on the 11069 * resolved layout direction, or to inform child views that inherit their layout direction. 11070 * 11071 * The default implementation does nothing. 11072 * @hide 11073 */ 11074 public void onResolvedLayoutDirectionReset() { 11075 } 11076 11077 /** 11078 * Check if a Locale uses an RTL script. 11079 * 11080 * @param locale Locale to check 11081 * @return true if the Locale uses an RTL script. 11082 * @hide 11083 */ 11084 protected static boolean isLayoutDirectionRtl(Locale locale) { 11085 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11086 } 11087 11088 /** 11089 * This is called when the view is detached from a window. At this point it 11090 * no longer has a surface for drawing. 11091 * 11092 * @see #onAttachedToWindow() 11093 */ 11094 protected void onDetachedFromWindow() { 11095 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11096 11097 removeUnsetPressCallback(); 11098 removeLongPressCallback(); 11099 removePerformClickCallback(); 11100 removeSendViewScrolledAccessibilityEventCallback(); 11101 11102 destroyDrawingCache(); 11103 11104 destroyLayer(false); 11105 11106 if (mAttachInfo != null) { 11107 if (mDisplayList != null) { 11108 mAttachInfo.mViewRootImpl.invalidateDisplayList(mDisplayList); 11109 } 11110 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11111 } else { 11112 if (mDisplayList != null) { 11113 // Should never happen 11114 mDisplayList.invalidate(); 11115 } 11116 } 11117 11118 mCurrentAnimation = null; 11119 11120 resetResolvedLayoutDirection(); 11121 resetResolvedTextAlignment(); 11122 resetAccessibilityStateChanged(); 11123 clearAccessibilityFocus(); 11124 } 11125 11126 /** 11127 * @return The number of times this view has been attached to a window 11128 */ 11129 protected int getWindowAttachCount() { 11130 return mWindowAttachCount; 11131 } 11132 11133 /** 11134 * Retrieve a unique token identifying the window this view is attached to. 11135 * @return Return the window's token for use in 11136 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11137 */ 11138 public IBinder getWindowToken() { 11139 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11140 } 11141 11142 /** 11143 * Retrieve a unique token identifying the top-level "real" window of 11144 * the window that this view is attached to. That is, this is like 11145 * {@link #getWindowToken}, except if the window this view in is a panel 11146 * window (attached to another containing window), then the token of 11147 * the containing window is returned instead. 11148 * 11149 * @return Returns the associated window token, either 11150 * {@link #getWindowToken()} or the containing window's token. 11151 */ 11152 public IBinder getApplicationWindowToken() { 11153 AttachInfo ai = mAttachInfo; 11154 if (ai != null) { 11155 IBinder appWindowToken = ai.mPanelParentWindowToken; 11156 if (appWindowToken == null) { 11157 appWindowToken = ai.mWindowToken; 11158 } 11159 return appWindowToken; 11160 } 11161 return null; 11162 } 11163 11164 /** 11165 * Retrieve private session object this view hierarchy is using to 11166 * communicate with the window manager. 11167 * @return the session object to communicate with the window manager 11168 */ 11169 /*package*/ IWindowSession getWindowSession() { 11170 return mAttachInfo != null ? mAttachInfo.mSession : null; 11171 } 11172 11173 /** 11174 * @param info the {@link android.view.View.AttachInfo} to associated with 11175 * this view 11176 */ 11177 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11178 //System.out.println("Attached! " + this); 11179 mAttachInfo = info; 11180 mWindowAttachCount++; 11181 // We will need to evaluate the drawable state at least once. 11182 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11183 if (mFloatingTreeObserver != null) { 11184 info.mTreeObserver.merge(mFloatingTreeObserver); 11185 mFloatingTreeObserver = null; 11186 } 11187 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11188 mAttachInfo.mScrollContainers.add(this); 11189 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11190 } 11191 performCollectViewAttributes(mAttachInfo, visibility); 11192 onAttachedToWindow(); 11193 11194 ListenerInfo li = mListenerInfo; 11195 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11196 li != null ? li.mOnAttachStateChangeListeners : null; 11197 if (listeners != null && listeners.size() > 0) { 11198 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11199 // perform the dispatching. The iterator is a safe guard against listeners that 11200 // could mutate the list by calling the various add/remove methods. This prevents 11201 // the array from being modified while we iterate it. 11202 for (OnAttachStateChangeListener listener : listeners) { 11203 listener.onViewAttachedToWindow(this); 11204 } 11205 } 11206 11207 int vis = info.mWindowVisibility; 11208 if (vis != GONE) { 11209 onWindowVisibilityChanged(vis); 11210 } 11211 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11212 // If nobody has evaluated the drawable state yet, then do it now. 11213 refreshDrawableState(); 11214 } 11215 } 11216 11217 void dispatchDetachedFromWindow() { 11218 AttachInfo info = mAttachInfo; 11219 if (info != null) { 11220 int vis = info.mWindowVisibility; 11221 if (vis != GONE) { 11222 onWindowVisibilityChanged(GONE); 11223 } 11224 } 11225 11226 onDetachedFromWindow(); 11227 11228 ListenerInfo li = mListenerInfo; 11229 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11230 li != null ? li.mOnAttachStateChangeListeners : null; 11231 if (listeners != null && listeners.size() > 0) { 11232 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11233 // perform the dispatching. The iterator is a safe guard against listeners that 11234 // could mutate the list by calling the various add/remove methods. This prevents 11235 // the array from being modified while we iterate it. 11236 for (OnAttachStateChangeListener listener : listeners) { 11237 listener.onViewDetachedFromWindow(this); 11238 } 11239 } 11240 11241 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11242 mAttachInfo.mScrollContainers.remove(this); 11243 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11244 } 11245 11246 mAttachInfo = null; 11247 } 11248 11249 /** 11250 * Store this view hierarchy's frozen state into the given container. 11251 * 11252 * @param container The SparseArray in which to save the view's state. 11253 * 11254 * @see #restoreHierarchyState(android.util.SparseArray) 11255 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11256 * @see #onSaveInstanceState() 11257 */ 11258 public void saveHierarchyState(SparseArray<Parcelable> container) { 11259 dispatchSaveInstanceState(container); 11260 } 11261 11262 /** 11263 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11264 * this view and its children. May be overridden to modify how freezing happens to a 11265 * view's children; for example, some views may want to not store state for their children. 11266 * 11267 * @param container The SparseArray in which to save the view's state. 11268 * 11269 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11270 * @see #saveHierarchyState(android.util.SparseArray) 11271 * @see #onSaveInstanceState() 11272 */ 11273 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11274 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11275 mPrivateFlags &= ~SAVE_STATE_CALLED; 11276 Parcelable state = onSaveInstanceState(); 11277 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11278 throw new IllegalStateException( 11279 "Derived class did not call super.onSaveInstanceState()"); 11280 } 11281 if (state != null) { 11282 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11283 // + ": " + state); 11284 container.put(mID, state); 11285 } 11286 } 11287 } 11288 11289 /** 11290 * Hook allowing a view to generate a representation of its internal state 11291 * that can later be used to create a new instance with that same state. 11292 * This state should only contain information that is not persistent or can 11293 * not be reconstructed later. For example, you will never store your 11294 * current position on screen because that will be computed again when a 11295 * new instance of the view is placed in its view hierarchy. 11296 * <p> 11297 * Some examples of things you may store here: the current cursor position 11298 * in a text view (but usually not the text itself since that is stored in a 11299 * content provider or other persistent storage), the currently selected 11300 * item in a list view. 11301 * 11302 * @return Returns a Parcelable object containing the view's current dynamic 11303 * state, or null if there is nothing interesting to save. The 11304 * default implementation returns null. 11305 * @see #onRestoreInstanceState(android.os.Parcelable) 11306 * @see #saveHierarchyState(android.util.SparseArray) 11307 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11308 * @see #setSaveEnabled(boolean) 11309 */ 11310 protected Parcelable onSaveInstanceState() { 11311 mPrivateFlags |= SAVE_STATE_CALLED; 11312 return BaseSavedState.EMPTY_STATE; 11313 } 11314 11315 /** 11316 * Restore this view hierarchy's frozen state from the given container. 11317 * 11318 * @param container The SparseArray which holds previously frozen states. 11319 * 11320 * @see #saveHierarchyState(android.util.SparseArray) 11321 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11322 * @see #onRestoreInstanceState(android.os.Parcelable) 11323 */ 11324 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11325 dispatchRestoreInstanceState(container); 11326 } 11327 11328 /** 11329 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11330 * state for this view and its children. May be overridden to modify how restoring 11331 * happens to a view's children; for example, some views may want to not store state 11332 * for their children. 11333 * 11334 * @param container The SparseArray which holds previously saved state. 11335 * 11336 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11337 * @see #restoreHierarchyState(android.util.SparseArray) 11338 * @see #onRestoreInstanceState(android.os.Parcelable) 11339 */ 11340 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11341 if (mID != NO_ID) { 11342 Parcelable state = container.get(mID); 11343 if (state != null) { 11344 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11345 // + ": " + state); 11346 mPrivateFlags &= ~SAVE_STATE_CALLED; 11347 onRestoreInstanceState(state); 11348 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11349 throw new IllegalStateException( 11350 "Derived class did not call super.onRestoreInstanceState()"); 11351 } 11352 } 11353 } 11354 } 11355 11356 /** 11357 * Hook allowing a view to re-apply a representation of its internal state that had previously 11358 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11359 * null state. 11360 * 11361 * @param state The frozen state that had previously been returned by 11362 * {@link #onSaveInstanceState}. 11363 * 11364 * @see #onSaveInstanceState() 11365 * @see #restoreHierarchyState(android.util.SparseArray) 11366 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11367 */ 11368 protected void onRestoreInstanceState(Parcelable state) { 11369 mPrivateFlags |= SAVE_STATE_CALLED; 11370 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11371 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11372 + "received " + state.getClass().toString() + " instead. This usually happens " 11373 + "when two views of different type have the same id in the same hierarchy. " 11374 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11375 + "other views do not use the same id."); 11376 } 11377 } 11378 11379 /** 11380 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11381 * 11382 * @return the drawing start time in milliseconds 11383 */ 11384 public long getDrawingTime() { 11385 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11386 } 11387 11388 /** 11389 * <p>Enables or disables the duplication of the parent's state into this view. When 11390 * duplication is enabled, this view gets its drawable state from its parent rather 11391 * than from its own internal properties.</p> 11392 * 11393 * <p>Note: in the current implementation, setting this property to true after the 11394 * view was added to a ViewGroup might have no effect at all. This property should 11395 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11396 * 11397 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11398 * property is enabled, an exception will be thrown.</p> 11399 * 11400 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11401 * parent, these states should not be affected by this method.</p> 11402 * 11403 * @param enabled True to enable duplication of the parent's drawable state, false 11404 * to disable it. 11405 * 11406 * @see #getDrawableState() 11407 * @see #isDuplicateParentStateEnabled() 11408 */ 11409 public void setDuplicateParentStateEnabled(boolean enabled) { 11410 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11411 } 11412 11413 /** 11414 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11415 * 11416 * @return True if this view's drawable state is duplicated from the parent, 11417 * false otherwise 11418 * 11419 * @see #getDrawableState() 11420 * @see #setDuplicateParentStateEnabled(boolean) 11421 */ 11422 public boolean isDuplicateParentStateEnabled() { 11423 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11424 } 11425 11426 /** 11427 * <p>Specifies the type of layer backing this view. The layer can be 11428 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11429 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11430 * 11431 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11432 * instance that controls how the layer is composed on screen. The following 11433 * properties of the paint are taken into account when composing the layer:</p> 11434 * <ul> 11435 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11436 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11437 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11438 * </ul> 11439 * 11440 * <p>If this view has an alpha value set to < 1.0 by calling 11441 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11442 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11443 * equivalent to setting a hardware layer on this view and providing a paint with 11444 * the desired alpha value.<p> 11445 * 11446 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11447 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11448 * for more information on when and how to use layers.</p> 11449 * 11450 * @param layerType The ype of layer to use with this view, must be one of 11451 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11452 * {@link #LAYER_TYPE_HARDWARE} 11453 * @param paint The paint used to compose the layer. This argument is optional 11454 * and can be null. It is ignored when the layer type is 11455 * {@link #LAYER_TYPE_NONE} 11456 * 11457 * @see #getLayerType() 11458 * @see #LAYER_TYPE_NONE 11459 * @see #LAYER_TYPE_SOFTWARE 11460 * @see #LAYER_TYPE_HARDWARE 11461 * @see #setAlpha(float) 11462 * 11463 * @attr ref android.R.styleable#View_layerType 11464 */ 11465 public void setLayerType(int layerType, Paint paint) { 11466 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11467 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11468 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11469 } 11470 11471 if (layerType == mLayerType) { 11472 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11473 mLayerPaint = paint == null ? new Paint() : paint; 11474 invalidateParentCaches(); 11475 invalidate(true); 11476 } 11477 return; 11478 } 11479 11480 // Destroy any previous software drawing cache if needed 11481 switch (mLayerType) { 11482 case LAYER_TYPE_HARDWARE: 11483 destroyLayer(false); 11484 // fall through - non-accelerated views may use software layer mechanism instead 11485 case LAYER_TYPE_SOFTWARE: 11486 destroyDrawingCache(); 11487 break; 11488 default: 11489 break; 11490 } 11491 11492 mLayerType = layerType; 11493 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11494 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11495 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11496 11497 invalidateParentCaches(); 11498 invalidate(true); 11499 } 11500 11501 /** 11502 * Indicates whether this view has a static layer. A view with layer type 11503 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11504 * dynamic. 11505 */ 11506 boolean hasStaticLayer() { 11507 return true; 11508 } 11509 11510 /** 11511 * Indicates what type of layer is currently associated with this view. By default 11512 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11513 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11514 * for more information on the different types of layers. 11515 * 11516 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11517 * {@link #LAYER_TYPE_HARDWARE} 11518 * 11519 * @see #setLayerType(int, android.graphics.Paint) 11520 * @see #buildLayer() 11521 * @see #LAYER_TYPE_NONE 11522 * @see #LAYER_TYPE_SOFTWARE 11523 * @see #LAYER_TYPE_HARDWARE 11524 */ 11525 public int getLayerType() { 11526 return mLayerType; 11527 } 11528 11529 /** 11530 * Forces this view's layer to be created and this view to be rendered 11531 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11532 * invoking this method will have no effect. 11533 * 11534 * This method can for instance be used to render a view into its layer before 11535 * starting an animation. If this view is complex, rendering into the layer 11536 * before starting the animation will avoid skipping frames. 11537 * 11538 * @throws IllegalStateException If this view is not attached to a window 11539 * 11540 * @see #setLayerType(int, android.graphics.Paint) 11541 */ 11542 public void buildLayer() { 11543 if (mLayerType == LAYER_TYPE_NONE) return; 11544 11545 if (mAttachInfo == null) { 11546 throw new IllegalStateException("This view must be attached to a window first"); 11547 } 11548 11549 switch (mLayerType) { 11550 case LAYER_TYPE_HARDWARE: 11551 if (mAttachInfo.mHardwareRenderer != null && 11552 mAttachInfo.mHardwareRenderer.isEnabled() && 11553 mAttachInfo.mHardwareRenderer.validate()) { 11554 getHardwareLayer(); 11555 } 11556 break; 11557 case LAYER_TYPE_SOFTWARE: 11558 buildDrawingCache(true); 11559 break; 11560 } 11561 } 11562 11563 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11564 void flushLayer() { 11565 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11566 mHardwareLayer.flush(); 11567 } 11568 } 11569 11570 /** 11571 * <p>Returns a hardware layer that can be used to draw this view again 11572 * without executing its draw method.</p> 11573 * 11574 * @return A HardwareLayer ready to render, or null if an error occurred. 11575 */ 11576 HardwareLayer getHardwareLayer() { 11577 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11578 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11579 return null; 11580 } 11581 11582 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11583 11584 final int width = mRight - mLeft; 11585 final int height = mBottom - mTop; 11586 11587 if (width == 0 || height == 0) { 11588 return null; 11589 } 11590 11591 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11592 if (mHardwareLayer == null) { 11593 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11594 width, height, isOpaque()); 11595 mLocalDirtyRect.set(0, 0, width, height); 11596 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11597 mHardwareLayer.resize(width, height); 11598 mLocalDirtyRect.set(0, 0, width, height); 11599 } 11600 11601 // The layer is not valid if the underlying GPU resources cannot be allocated 11602 if (!mHardwareLayer.isValid()) { 11603 return null; 11604 } 11605 11606 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11607 mLocalDirtyRect.setEmpty(); 11608 } 11609 11610 return mHardwareLayer; 11611 } 11612 11613 /** 11614 * Destroys this View's hardware layer if possible. 11615 * 11616 * @return True if the layer was destroyed, false otherwise. 11617 * 11618 * @see #setLayerType(int, android.graphics.Paint) 11619 * @see #LAYER_TYPE_HARDWARE 11620 */ 11621 boolean destroyLayer(boolean valid) { 11622 if (mHardwareLayer != null) { 11623 AttachInfo info = mAttachInfo; 11624 if (info != null && info.mHardwareRenderer != null && 11625 info.mHardwareRenderer.isEnabled() && 11626 (valid || info.mHardwareRenderer.validate())) { 11627 mHardwareLayer.destroy(); 11628 mHardwareLayer = null; 11629 11630 invalidate(true); 11631 invalidateParentCaches(); 11632 } 11633 return true; 11634 } 11635 return false; 11636 } 11637 11638 /** 11639 * Destroys all hardware rendering resources. This method is invoked 11640 * when the system needs to reclaim resources. Upon execution of this 11641 * method, you should free any OpenGL resources created by the view. 11642 * 11643 * Note: you <strong>must</strong> call 11644 * <code>super.destroyHardwareResources()</code> when overriding 11645 * this method. 11646 * 11647 * @hide 11648 */ 11649 protected void destroyHardwareResources() { 11650 destroyLayer(true); 11651 } 11652 11653 /** 11654 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11655 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11656 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11657 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11658 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11659 * null.</p> 11660 * 11661 * <p>Enabling the drawing cache is similar to 11662 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11663 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11664 * drawing cache has no effect on rendering because the system uses a different mechanism 11665 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11666 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11667 * for information on how to enable software and hardware layers.</p> 11668 * 11669 * <p>This API can be used to manually generate 11670 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11671 * {@link #getDrawingCache()}.</p> 11672 * 11673 * @param enabled true to enable the drawing cache, false otherwise 11674 * 11675 * @see #isDrawingCacheEnabled() 11676 * @see #getDrawingCache() 11677 * @see #buildDrawingCache() 11678 * @see #setLayerType(int, android.graphics.Paint) 11679 */ 11680 public void setDrawingCacheEnabled(boolean enabled) { 11681 mCachingFailed = false; 11682 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 11683 } 11684 11685 /** 11686 * <p>Indicates whether the drawing cache is enabled for this view.</p> 11687 * 11688 * @return true if the drawing cache is enabled 11689 * 11690 * @see #setDrawingCacheEnabled(boolean) 11691 * @see #getDrawingCache() 11692 */ 11693 @ViewDebug.ExportedProperty(category = "drawing") 11694 public boolean isDrawingCacheEnabled() { 11695 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 11696 } 11697 11698 /** 11699 * Debugging utility which recursively outputs the dirty state of a view and its 11700 * descendants. 11701 * 11702 * @hide 11703 */ 11704 @SuppressWarnings({"UnusedDeclaration"}) 11705 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 11706 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 11707 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 11708 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 11709 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 11710 if (clear) { 11711 mPrivateFlags &= clearMask; 11712 } 11713 if (this instanceof ViewGroup) { 11714 ViewGroup parent = (ViewGroup) this; 11715 final int count = parent.getChildCount(); 11716 for (int i = 0; i < count; i++) { 11717 final View child = parent.getChildAt(i); 11718 child.outputDirtyFlags(indent + " ", clear, clearMask); 11719 } 11720 } 11721 } 11722 11723 /** 11724 * This method is used by ViewGroup to cause its children to restore or recreate their 11725 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 11726 * to recreate its own display list, which would happen if it went through the normal 11727 * draw/dispatchDraw mechanisms. 11728 * 11729 * @hide 11730 */ 11731 protected void dispatchGetDisplayList() {} 11732 11733 /** 11734 * A view that is not attached or hardware accelerated cannot create a display list. 11735 * This method checks these conditions and returns the appropriate result. 11736 * 11737 * @return true if view has the ability to create a display list, false otherwise. 11738 * 11739 * @hide 11740 */ 11741 public boolean canHaveDisplayList() { 11742 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 11743 } 11744 11745 /** 11746 * @return The HardwareRenderer associated with that view or null if hardware rendering 11747 * is not supported or this this has not been attached to a window. 11748 * 11749 * @hide 11750 */ 11751 public HardwareRenderer getHardwareRenderer() { 11752 if (mAttachInfo != null) { 11753 return mAttachInfo.mHardwareRenderer; 11754 } 11755 return null; 11756 } 11757 11758 /** 11759 * Returns a DisplayList. If the incoming displayList is null, one will be created. 11760 * Otherwise, the same display list will be returned (after having been rendered into 11761 * along the way, depending on the invalidation state of the view). 11762 * 11763 * @param displayList The previous version of this displayList, could be null. 11764 * @param isLayer Whether the requester of the display list is a layer. If so, 11765 * the view will avoid creating a layer inside the resulting display list. 11766 * @return A new or reused DisplayList object. 11767 */ 11768 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 11769 if (!canHaveDisplayList()) { 11770 return null; 11771 } 11772 11773 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 11774 displayList == null || !displayList.isValid() || 11775 (!isLayer && mRecreateDisplayList))) { 11776 // Don't need to recreate the display list, just need to tell our 11777 // children to restore/recreate theirs 11778 if (displayList != null && displayList.isValid() && 11779 !isLayer && !mRecreateDisplayList) { 11780 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11781 mPrivateFlags &= ~DIRTY_MASK; 11782 dispatchGetDisplayList(); 11783 11784 return displayList; 11785 } 11786 11787 if (!isLayer) { 11788 // If we got here, we're recreating it. Mark it as such to ensure that 11789 // we copy in child display lists into ours in drawChild() 11790 mRecreateDisplayList = true; 11791 } 11792 if (displayList == null) { 11793 final String name = getClass().getSimpleName(); 11794 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 11795 // If we're creating a new display list, make sure our parent gets invalidated 11796 // since they will need to recreate their display list to account for this 11797 // new child display list. 11798 invalidateParentCaches(); 11799 } 11800 11801 boolean caching = false; 11802 final HardwareCanvas canvas = displayList.start(); 11803 int restoreCount = 0; 11804 int width = mRight - mLeft; 11805 int height = mBottom - mTop; 11806 11807 try { 11808 canvas.setViewport(width, height); 11809 // The dirty rect should always be null for a display list 11810 canvas.onPreDraw(null); 11811 int layerType = ( 11812 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 11813 getLayerType() : LAYER_TYPE_NONE; 11814 if (!isLayer && layerType != LAYER_TYPE_NONE) { 11815 if (layerType == LAYER_TYPE_HARDWARE) { 11816 final HardwareLayer layer = getHardwareLayer(); 11817 if (layer != null && layer.isValid()) { 11818 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 11819 } else { 11820 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 11821 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 11822 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 11823 } 11824 caching = true; 11825 } else { 11826 buildDrawingCache(true); 11827 Bitmap cache = getDrawingCache(true); 11828 if (cache != null) { 11829 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 11830 caching = true; 11831 } 11832 } 11833 } else { 11834 11835 computeScroll(); 11836 11837 canvas.translate(-mScrollX, -mScrollY); 11838 if (!isLayer) { 11839 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11840 mPrivateFlags &= ~DIRTY_MASK; 11841 } 11842 11843 // Fast path for layouts with no backgrounds 11844 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11845 dispatchDraw(canvas); 11846 } else { 11847 draw(canvas); 11848 } 11849 } 11850 } finally { 11851 canvas.onPostDraw(); 11852 11853 displayList.end(); 11854 displayList.setCaching(caching); 11855 if (isLayer) { 11856 displayList.setLeftTopRightBottom(0, 0, width, height); 11857 } else { 11858 setDisplayListProperties(displayList); 11859 } 11860 } 11861 } else if (!isLayer) { 11862 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11863 mPrivateFlags &= ~DIRTY_MASK; 11864 } 11865 11866 return displayList; 11867 } 11868 11869 /** 11870 * Get the DisplayList for the HardwareLayer 11871 * 11872 * @param layer The HardwareLayer whose DisplayList we want 11873 * @return A DisplayList fopr the specified HardwareLayer 11874 */ 11875 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 11876 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 11877 layer.setDisplayList(displayList); 11878 return displayList; 11879 } 11880 11881 11882 /** 11883 * <p>Returns a display list that can be used to draw this view again 11884 * without executing its draw method.</p> 11885 * 11886 * @return A DisplayList ready to replay, or null if caching is not enabled. 11887 * 11888 * @hide 11889 */ 11890 public DisplayList getDisplayList() { 11891 mDisplayList = getDisplayList(mDisplayList, false); 11892 return mDisplayList; 11893 } 11894 11895 /** 11896 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 11897 * 11898 * @return A non-scaled bitmap representing this view or null if cache is disabled. 11899 * 11900 * @see #getDrawingCache(boolean) 11901 */ 11902 public Bitmap getDrawingCache() { 11903 return getDrawingCache(false); 11904 } 11905 11906 /** 11907 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 11908 * is null when caching is disabled. If caching is enabled and the cache is not ready, 11909 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 11910 * draw from the cache when the cache is enabled. To benefit from the cache, you must 11911 * request the drawing cache by calling this method and draw it on screen if the 11912 * returned bitmap is not null.</p> 11913 * 11914 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 11915 * this method will create a bitmap of the same size as this view. Because this bitmap 11916 * will be drawn scaled by the parent ViewGroup, the result on screen might show 11917 * scaling artifacts. To avoid such artifacts, you should call this method by setting 11918 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 11919 * size than the view. This implies that your application must be able to handle this 11920 * size.</p> 11921 * 11922 * @param autoScale Indicates whether the generated bitmap should be scaled based on 11923 * the current density of the screen when the application is in compatibility 11924 * mode. 11925 * 11926 * @return A bitmap representing this view or null if cache is disabled. 11927 * 11928 * @see #setDrawingCacheEnabled(boolean) 11929 * @see #isDrawingCacheEnabled() 11930 * @see #buildDrawingCache(boolean) 11931 * @see #destroyDrawingCache() 11932 */ 11933 public Bitmap getDrawingCache(boolean autoScale) { 11934 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 11935 return null; 11936 } 11937 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 11938 buildDrawingCache(autoScale); 11939 } 11940 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 11941 } 11942 11943 /** 11944 * <p>Frees the resources used by the drawing cache. If you call 11945 * {@link #buildDrawingCache()} manually without calling 11946 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 11947 * should cleanup the cache with this method afterwards.</p> 11948 * 11949 * @see #setDrawingCacheEnabled(boolean) 11950 * @see #buildDrawingCache() 11951 * @see #getDrawingCache() 11952 */ 11953 public void destroyDrawingCache() { 11954 if (mDrawingCache != null) { 11955 mDrawingCache.recycle(); 11956 mDrawingCache = null; 11957 } 11958 if (mUnscaledDrawingCache != null) { 11959 mUnscaledDrawingCache.recycle(); 11960 mUnscaledDrawingCache = null; 11961 } 11962 } 11963 11964 /** 11965 * Setting a solid background color for the drawing cache's bitmaps will improve 11966 * performance and memory usage. Note, though that this should only be used if this 11967 * view will always be drawn on top of a solid color. 11968 * 11969 * @param color The background color to use for the drawing cache's bitmap 11970 * 11971 * @see #setDrawingCacheEnabled(boolean) 11972 * @see #buildDrawingCache() 11973 * @see #getDrawingCache() 11974 */ 11975 public void setDrawingCacheBackgroundColor(int color) { 11976 if (color != mDrawingCacheBackgroundColor) { 11977 mDrawingCacheBackgroundColor = color; 11978 mPrivateFlags &= ~DRAWING_CACHE_VALID; 11979 } 11980 } 11981 11982 /** 11983 * @see #setDrawingCacheBackgroundColor(int) 11984 * 11985 * @return The background color to used for the drawing cache's bitmap 11986 */ 11987 public int getDrawingCacheBackgroundColor() { 11988 return mDrawingCacheBackgroundColor; 11989 } 11990 11991 /** 11992 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 11993 * 11994 * @see #buildDrawingCache(boolean) 11995 */ 11996 public void buildDrawingCache() { 11997 buildDrawingCache(false); 11998 } 11999 12000 /** 12001 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 12002 * 12003 * <p>If you call {@link #buildDrawingCache()} manually without calling 12004 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 12005 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 12006 * 12007 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 12008 * this method will create a bitmap of the same size as this view. Because this bitmap 12009 * will be drawn scaled by the parent ViewGroup, the result on screen might show 12010 * scaling artifacts. To avoid such artifacts, you should call this method by setting 12011 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 12012 * size than the view. This implies that your application must be able to handle this 12013 * size.</p> 12014 * 12015 * <p>You should avoid calling this method when hardware acceleration is enabled. If 12016 * you do not need the drawing cache bitmap, calling this method will increase memory 12017 * usage and cause the view to be rendered in software once, thus negatively impacting 12018 * performance.</p> 12019 * 12020 * @see #getDrawingCache() 12021 * @see #destroyDrawingCache() 12022 */ 12023 public void buildDrawingCache(boolean autoScale) { 12024 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 12025 mDrawingCache == null : mUnscaledDrawingCache == null)) { 12026 mCachingFailed = false; 12027 12028 if (ViewDebug.TRACE_HIERARCHY) { 12029 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12030 } 12031 12032 int width = mRight - mLeft; 12033 int height = mBottom - mTop; 12034 12035 final AttachInfo attachInfo = mAttachInfo; 12036 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12037 12038 if (autoScale && scalingRequired) { 12039 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12040 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12041 } 12042 12043 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12044 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12045 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12046 12047 if (width <= 0 || height <= 0 || 12048 // Projected bitmap size in bytes 12049 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12050 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12051 destroyDrawingCache(); 12052 mCachingFailed = true; 12053 return; 12054 } 12055 12056 boolean clear = true; 12057 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12058 12059 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12060 Bitmap.Config quality; 12061 if (!opaque) { 12062 // Never pick ARGB_4444 because it looks awful 12063 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12064 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12065 case DRAWING_CACHE_QUALITY_AUTO: 12066 quality = Bitmap.Config.ARGB_8888; 12067 break; 12068 case DRAWING_CACHE_QUALITY_LOW: 12069 quality = Bitmap.Config.ARGB_8888; 12070 break; 12071 case DRAWING_CACHE_QUALITY_HIGH: 12072 quality = Bitmap.Config.ARGB_8888; 12073 break; 12074 default: 12075 quality = Bitmap.Config.ARGB_8888; 12076 break; 12077 } 12078 } else { 12079 // Optimization for translucent windows 12080 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12081 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12082 } 12083 12084 // Try to cleanup memory 12085 if (bitmap != null) bitmap.recycle(); 12086 12087 try { 12088 bitmap = Bitmap.createBitmap(width, height, quality); 12089 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12090 if (autoScale) { 12091 mDrawingCache = bitmap; 12092 } else { 12093 mUnscaledDrawingCache = bitmap; 12094 } 12095 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12096 } catch (OutOfMemoryError e) { 12097 // If there is not enough memory to create the bitmap cache, just 12098 // ignore the issue as bitmap caches are not required to draw the 12099 // view hierarchy 12100 if (autoScale) { 12101 mDrawingCache = null; 12102 } else { 12103 mUnscaledDrawingCache = null; 12104 } 12105 mCachingFailed = true; 12106 return; 12107 } 12108 12109 clear = drawingCacheBackgroundColor != 0; 12110 } 12111 12112 Canvas canvas; 12113 if (attachInfo != null) { 12114 canvas = attachInfo.mCanvas; 12115 if (canvas == null) { 12116 canvas = new Canvas(); 12117 } 12118 canvas.setBitmap(bitmap); 12119 // Temporarily clobber the cached Canvas in case one of our children 12120 // is also using a drawing cache. Without this, the children would 12121 // steal the canvas by attaching their own bitmap to it and bad, bad 12122 // thing would happen (invisible views, corrupted drawings, etc.) 12123 attachInfo.mCanvas = null; 12124 } else { 12125 // This case should hopefully never or seldom happen 12126 canvas = new Canvas(bitmap); 12127 } 12128 12129 if (clear) { 12130 bitmap.eraseColor(drawingCacheBackgroundColor); 12131 } 12132 12133 computeScroll(); 12134 final int restoreCount = canvas.save(); 12135 12136 if (autoScale && scalingRequired) { 12137 final float scale = attachInfo.mApplicationScale; 12138 canvas.scale(scale, scale); 12139 } 12140 12141 canvas.translate(-mScrollX, -mScrollY); 12142 12143 mPrivateFlags |= DRAWN; 12144 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12145 mLayerType != LAYER_TYPE_NONE) { 12146 mPrivateFlags |= DRAWING_CACHE_VALID; 12147 } 12148 12149 // Fast path for layouts with no backgrounds 12150 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12151 if (ViewDebug.TRACE_HIERARCHY) { 12152 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12153 } 12154 mPrivateFlags &= ~DIRTY_MASK; 12155 dispatchDraw(canvas); 12156 } else { 12157 draw(canvas); 12158 } 12159 12160 canvas.restoreToCount(restoreCount); 12161 canvas.setBitmap(null); 12162 12163 if (attachInfo != null) { 12164 // Restore the cached Canvas for our siblings 12165 attachInfo.mCanvas = canvas; 12166 } 12167 } 12168 } 12169 12170 /** 12171 * Create a snapshot of the view into a bitmap. We should probably make 12172 * some form of this public, but should think about the API. 12173 */ 12174 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12175 int width = mRight - mLeft; 12176 int height = mBottom - mTop; 12177 12178 final AttachInfo attachInfo = mAttachInfo; 12179 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12180 width = (int) ((width * scale) + 0.5f); 12181 height = (int) ((height * scale) + 0.5f); 12182 12183 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12184 if (bitmap == null) { 12185 throw new OutOfMemoryError(); 12186 } 12187 12188 Resources resources = getResources(); 12189 if (resources != null) { 12190 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12191 } 12192 12193 Canvas canvas; 12194 if (attachInfo != null) { 12195 canvas = attachInfo.mCanvas; 12196 if (canvas == null) { 12197 canvas = new Canvas(); 12198 } 12199 canvas.setBitmap(bitmap); 12200 // Temporarily clobber the cached Canvas in case one of our children 12201 // is also using a drawing cache. Without this, the children would 12202 // steal the canvas by attaching their own bitmap to it and bad, bad 12203 // things would happen (invisible views, corrupted drawings, etc.) 12204 attachInfo.mCanvas = null; 12205 } else { 12206 // This case should hopefully never or seldom happen 12207 canvas = new Canvas(bitmap); 12208 } 12209 12210 if ((backgroundColor & 0xff000000) != 0) { 12211 bitmap.eraseColor(backgroundColor); 12212 } 12213 12214 computeScroll(); 12215 final int restoreCount = canvas.save(); 12216 canvas.scale(scale, scale); 12217 canvas.translate(-mScrollX, -mScrollY); 12218 12219 // Temporarily remove the dirty mask 12220 int flags = mPrivateFlags; 12221 mPrivateFlags &= ~DIRTY_MASK; 12222 12223 // Fast path for layouts with no backgrounds 12224 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12225 dispatchDraw(canvas); 12226 } else { 12227 draw(canvas); 12228 } 12229 12230 mPrivateFlags = flags; 12231 12232 canvas.restoreToCount(restoreCount); 12233 canvas.setBitmap(null); 12234 12235 if (attachInfo != null) { 12236 // Restore the cached Canvas for our siblings 12237 attachInfo.mCanvas = canvas; 12238 } 12239 12240 return bitmap; 12241 } 12242 12243 /** 12244 * Indicates whether this View is currently in edit mode. A View is usually 12245 * in edit mode when displayed within a developer tool. For instance, if 12246 * this View is being drawn by a visual user interface builder, this method 12247 * should return true. 12248 * 12249 * Subclasses should check the return value of this method to provide 12250 * different behaviors if their normal behavior might interfere with the 12251 * host environment. For instance: the class spawns a thread in its 12252 * constructor, the drawing code relies on device-specific features, etc. 12253 * 12254 * This method is usually checked in the drawing code of custom widgets. 12255 * 12256 * @return True if this View is in edit mode, false otherwise. 12257 */ 12258 public boolean isInEditMode() { 12259 return false; 12260 } 12261 12262 /** 12263 * If the View draws content inside its padding and enables fading edges, 12264 * it needs to support padding offsets. Padding offsets are added to the 12265 * fading edges to extend the length of the fade so that it covers pixels 12266 * drawn inside the padding. 12267 * 12268 * Subclasses of this class should override this method if they need 12269 * to draw content inside the padding. 12270 * 12271 * @return True if padding offset must be applied, false otherwise. 12272 * 12273 * @see #getLeftPaddingOffset() 12274 * @see #getRightPaddingOffset() 12275 * @see #getTopPaddingOffset() 12276 * @see #getBottomPaddingOffset() 12277 * 12278 * @since CURRENT 12279 */ 12280 protected boolean isPaddingOffsetRequired() { 12281 return false; 12282 } 12283 12284 /** 12285 * Amount by which to extend the left fading region. Called only when 12286 * {@link #isPaddingOffsetRequired()} returns true. 12287 * 12288 * @return The left padding offset in pixels. 12289 * 12290 * @see #isPaddingOffsetRequired() 12291 * 12292 * @since CURRENT 12293 */ 12294 protected int getLeftPaddingOffset() { 12295 return 0; 12296 } 12297 12298 /** 12299 * Amount by which to extend the right fading region. Called only when 12300 * {@link #isPaddingOffsetRequired()} returns true. 12301 * 12302 * @return The right padding offset in pixels. 12303 * 12304 * @see #isPaddingOffsetRequired() 12305 * 12306 * @since CURRENT 12307 */ 12308 protected int getRightPaddingOffset() { 12309 return 0; 12310 } 12311 12312 /** 12313 * Amount by which to extend the top fading region. Called only when 12314 * {@link #isPaddingOffsetRequired()} returns true. 12315 * 12316 * @return The top padding offset in pixels. 12317 * 12318 * @see #isPaddingOffsetRequired() 12319 * 12320 * @since CURRENT 12321 */ 12322 protected int getTopPaddingOffset() { 12323 return 0; 12324 } 12325 12326 /** 12327 * Amount by which to extend the bottom fading region. Called only when 12328 * {@link #isPaddingOffsetRequired()} returns true. 12329 * 12330 * @return The bottom padding offset in pixels. 12331 * 12332 * @see #isPaddingOffsetRequired() 12333 * 12334 * @since CURRENT 12335 */ 12336 protected int getBottomPaddingOffset() { 12337 return 0; 12338 } 12339 12340 /** 12341 * @hide 12342 * @param offsetRequired 12343 */ 12344 protected int getFadeTop(boolean offsetRequired) { 12345 int top = mPaddingTop; 12346 if (offsetRequired) top += getTopPaddingOffset(); 12347 return top; 12348 } 12349 12350 /** 12351 * @hide 12352 * @param offsetRequired 12353 */ 12354 protected int getFadeHeight(boolean offsetRequired) { 12355 int padding = mPaddingTop; 12356 if (offsetRequired) padding += getTopPaddingOffset(); 12357 return mBottom - mTop - mPaddingBottom - padding; 12358 } 12359 12360 /** 12361 * <p>Indicates whether this view is attached to a hardware accelerated 12362 * window or not.</p> 12363 * 12364 * <p>Even if this method returns true, it does not mean that every call 12365 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12366 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12367 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12368 * window is hardware accelerated, 12369 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12370 * return false, and this method will return true.</p> 12371 * 12372 * @return True if the view is attached to a window and the window is 12373 * hardware accelerated; false in any other case. 12374 */ 12375 public boolean isHardwareAccelerated() { 12376 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12377 } 12378 12379 /** 12380 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12381 * case of an active Animation being run on the view. 12382 */ 12383 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12384 Animation a, boolean scalingRequired) { 12385 Transformation invalidationTransform; 12386 final int flags = parent.mGroupFlags; 12387 final boolean initialized = a.isInitialized(); 12388 if (!initialized) { 12389 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12390 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12391 onAnimationStart(); 12392 } 12393 12394 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12395 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12396 if (parent.mInvalidationTransformation == null) { 12397 parent.mInvalidationTransformation = new Transformation(); 12398 } 12399 invalidationTransform = parent.mInvalidationTransformation; 12400 a.getTransformation(drawingTime, invalidationTransform, 1f); 12401 } else { 12402 invalidationTransform = parent.mChildTransformation; 12403 } 12404 if (more) { 12405 if (!a.willChangeBounds()) { 12406 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12407 parent.FLAG_OPTIMIZE_INVALIDATE) { 12408 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12409 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12410 // The child need to draw an animation, potentially offscreen, so 12411 // make sure we do not cancel invalidate requests 12412 parent.mPrivateFlags |= DRAW_ANIMATION; 12413 parent.invalidate(mLeft, mTop, mRight, mBottom); 12414 } 12415 } else { 12416 if (parent.mInvalidateRegion == null) { 12417 parent.mInvalidateRegion = new RectF(); 12418 } 12419 final RectF region = parent.mInvalidateRegion; 12420 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12421 invalidationTransform); 12422 12423 // The child need to draw an animation, potentially offscreen, so 12424 // make sure we do not cancel invalidate requests 12425 parent.mPrivateFlags |= DRAW_ANIMATION; 12426 12427 final int left = mLeft + (int) region.left; 12428 final int top = mTop + (int) region.top; 12429 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12430 top + (int) (region.height() + .5f)); 12431 } 12432 } 12433 return more; 12434 } 12435 12436 void setDisplayListProperties() { 12437 setDisplayListProperties(mDisplayList); 12438 } 12439 12440 /** 12441 * This method is called by getDisplayList() when a display list is created or re-rendered. 12442 * It sets or resets the current value of all properties on that display list (resetting is 12443 * necessary when a display list is being re-created, because we need to make sure that 12444 * previously-set transform values 12445 */ 12446 void setDisplayListProperties(DisplayList displayList) { 12447 if (displayList != null) { 12448 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12449 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12450 if (mParent instanceof ViewGroup) { 12451 displayList.setClipChildren( 12452 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12453 } 12454 float alpha = 1; 12455 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12456 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12457 ViewGroup parentVG = (ViewGroup) mParent; 12458 final boolean hasTransform = 12459 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12460 if (hasTransform) { 12461 Transformation transform = parentVG.mChildTransformation; 12462 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12463 if (transformType != Transformation.TYPE_IDENTITY) { 12464 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12465 alpha = transform.getAlpha(); 12466 } 12467 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12468 displayList.setStaticMatrix(transform.getMatrix()); 12469 } 12470 } 12471 } 12472 } 12473 if (mTransformationInfo != null) { 12474 alpha *= mTransformationInfo.mAlpha; 12475 if (alpha < 1) { 12476 final int multipliedAlpha = (int) (255 * alpha); 12477 if (onSetAlpha(multipliedAlpha)) { 12478 alpha = 1; 12479 } 12480 } 12481 displayList.setTransformationInfo(alpha, 12482 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12483 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12484 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12485 mTransformationInfo.mScaleY); 12486 if (mTransformationInfo.mCamera == null) { 12487 mTransformationInfo.mCamera = new Camera(); 12488 mTransformationInfo.matrix3D = new Matrix(); 12489 } 12490 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12491 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12492 displayList.setPivotX(getPivotX()); 12493 displayList.setPivotY(getPivotY()); 12494 } 12495 } else if (alpha < 1) { 12496 displayList.setAlpha(alpha); 12497 } 12498 } 12499 } 12500 12501 /** 12502 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12503 * This draw() method is an implementation detail and is not intended to be overridden or 12504 * to be called from anywhere else other than ViewGroup.drawChild(). 12505 */ 12506 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12507 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12508 boolean more = false; 12509 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12510 final int flags = parent.mGroupFlags; 12511 12512 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12513 parent.mChildTransformation.clear(); 12514 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12515 } 12516 12517 Transformation transformToApply = null; 12518 boolean concatMatrix = false; 12519 12520 boolean scalingRequired = false; 12521 boolean caching; 12522 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12523 12524 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12525 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12526 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12527 caching = true; 12528 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12529 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12530 } else { 12531 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12532 } 12533 12534 final Animation a = getAnimation(); 12535 if (a != null) { 12536 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12537 concatMatrix = a.willChangeTransformationMatrix(); 12538 transformToApply = parent.mChildTransformation; 12539 } else if (!useDisplayListProperties && 12540 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12541 final boolean hasTransform = 12542 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12543 if (hasTransform) { 12544 final int transformType = parent.mChildTransformation.getTransformationType(); 12545 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12546 parent.mChildTransformation : null; 12547 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12548 } 12549 } 12550 12551 concatMatrix |= !childHasIdentityMatrix; 12552 12553 // Sets the flag as early as possible to allow draw() implementations 12554 // to call invalidate() successfully when doing animations 12555 mPrivateFlags |= DRAWN; 12556 12557 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12558 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12559 return more; 12560 } 12561 12562 if (hardwareAccelerated) { 12563 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12564 // retain the flag's value temporarily in the mRecreateDisplayList flag 12565 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12566 mPrivateFlags &= ~INVALIDATED; 12567 } 12568 12569 computeScroll(); 12570 12571 final int sx = mScrollX; 12572 final int sy = mScrollY; 12573 12574 DisplayList displayList = null; 12575 Bitmap cache = null; 12576 boolean hasDisplayList = false; 12577 if (caching) { 12578 if (!hardwareAccelerated) { 12579 if (layerType != LAYER_TYPE_NONE) { 12580 layerType = LAYER_TYPE_SOFTWARE; 12581 buildDrawingCache(true); 12582 } 12583 cache = getDrawingCache(true); 12584 } else { 12585 switch (layerType) { 12586 case LAYER_TYPE_SOFTWARE: 12587 if (useDisplayListProperties) { 12588 hasDisplayList = canHaveDisplayList(); 12589 } else { 12590 buildDrawingCache(true); 12591 cache = getDrawingCache(true); 12592 } 12593 break; 12594 case LAYER_TYPE_HARDWARE: 12595 if (useDisplayListProperties) { 12596 hasDisplayList = canHaveDisplayList(); 12597 } 12598 break; 12599 case LAYER_TYPE_NONE: 12600 // Delay getting the display list until animation-driven alpha values are 12601 // set up and possibly passed on to the view 12602 hasDisplayList = canHaveDisplayList(); 12603 break; 12604 } 12605 } 12606 } 12607 useDisplayListProperties &= hasDisplayList; 12608 if (useDisplayListProperties) { 12609 displayList = getDisplayList(); 12610 if (!displayList.isValid()) { 12611 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12612 // to getDisplayList(), the display list will be marked invalid and we should not 12613 // try to use it again. 12614 displayList = null; 12615 hasDisplayList = false; 12616 useDisplayListProperties = false; 12617 } 12618 } 12619 12620 final boolean hasNoCache = cache == null || hasDisplayList; 12621 final boolean offsetForScroll = cache == null && !hasDisplayList && 12622 layerType != LAYER_TYPE_HARDWARE; 12623 12624 int restoreTo = -1; 12625 if (!useDisplayListProperties || transformToApply != null) { 12626 restoreTo = canvas.save(); 12627 } 12628 if (offsetForScroll) { 12629 canvas.translate(mLeft - sx, mTop - sy); 12630 } else { 12631 if (!useDisplayListProperties) { 12632 canvas.translate(mLeft, mTop); 12633 } 12634 if (scalingRequired) { 12635 if (useDisplayListProperties) { 12636 // TODO: Might not need this if we put everything inside the DL 12637 restoreTo = canvas.save(); 12638 } 12639 // mAttachInfo cannot be null, otherwise scalingRequired == false 12640 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12641 canvas.scale(scale, scale); 12642 } 12643 } 12644 12645 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12646 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12647 if (transformToApply != null || !childHasIdentityMatrix) { 12648 int transX = 0; 12649 int transY = 0; 12650 12651 if (offsetForScroll) { 12652 transX = -sx; 12653 transY = -sy; 12654 } 12655 12656 if (transformToApply != null) { 12657 if (concatMatrix) { 12658 if (useDisplayListProperties) { 12659 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12660 } else { 12661 // Undo the scroll translation, apply the transformation matrix, 12662 // then redo the scroll translate to get the correct result. 12663 canvas.translate(-transX, -transY); 12664 canvas.concat(transformToApply.getMatrix()); 12665 canvas.translate(transX, transY); 12666 } 12667 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12668 } 12669 12670 float transformAlpha = transformToApply.getAlpha(); 12671 if (transformAlpha < 1) { 12672 alpha *= transformToApply.getAlpha(); 12673 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12674 } 12675 } 12676 12677 if (!childHasIdentityMatrix && !useDisplayListProperties) { 12678 canvas.translate(-transX, -transY); 12679 canvas.concat(getMatrix()); 12680 canvas.translate(transX, transY); 12681 } 12682 } 12683 12684 if (alpha < 1) { 12685 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12686 if (hasNoCache) { 12687 final int multipliedAlpha = (int) (255 * alpha); 12688 if (!onSetAlpha(multipliedAlpha)) { 12689 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12690 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 12691 layerType != LAYER_TYPE_NONE) { 12692 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 12693 } 12694 if (useDisplayListProperties) { 12695 displayList.setAlpha(alpha * getAlpha()); 12696 } else if (layerType == LAYER_TYPE_NONE) { 12697 final int scrollX = hasDisplayList ? 0 : sx; 12698 final int scrollY = hasDisplayList ? 0 : sy; 12699 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 12700 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 12701 } 12702 } else { 12703 // Alpha is handled by the child directly, clobber the layer's alpha 12704 mPrivateFlags |= ALPHA_SET; 12705 } 12706 } 12707 } 12708 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 12709 onSetAlpha(255); 12710 mPrivateFlags &= ~ALPHA_SET; 12711 } 12712 12713 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 12714 !useDisplayListProperties) { 12715 if (offsetForScroll) { 12716 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 12717 } else { 12718 if (!scalingRequired || cache == null) { 12719 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 12720 } else { 12721 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 12722 } 12723 } 12724 } 12725 12726 if (!useDisplayListProperties && hasDisplayList) { 12727 displayList = getDisplayList(); 12728 if (!displayList.isValid()) { 12729 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12730 // to getDisplayList(), the display list will be marked invalid and we should not 12731 // try to use it again. 12732 displayList = null; 12733 hasDisplayList = false; 12734 } 12735 } 12736 12737 if (hasNoCache) { 12738 boolean layerRendered = false; 12739 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 12740 final HardwareLayer layer = getHardwareLayer(); 12741 if (layer != null && layer.isValid()) { 12742 mLayerPaint.setAlpha((int) (alpha * 255)); 12743 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 12744 layerRendered = true; 12745 } else { 12746 final int scrollX = hasDisplayList ? 0 : sx; 12747 final int scrollY = hasDisplayList ? 0 : sy; 12748 canvas.saveLayer(scrollX, scrollY, 12749 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 12750 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12751 } 12752 } 12753 12754 if (!layerRendered) { 12755 if (!hasDisplayList) { 12756 // Fast path for layouts with no backgrounds 12757 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12758 if (ViewDebug.TRACE_HIERARCHY) { 12759 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 12760 } 12761 mPrivateFlags &= ~DIRTY_MASK; 12762 dispatchDraw(canvas); 12763 } else { 12764 draw(canvas); 12765 } 12766 } else { 12767 mPrivateFlags &= ~DIRTY_MASK; 12768 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 12769 } 12770 } 12771 } else if (cache != null) { 12772 mPrivateFlags &= ~DIRTY_MASK; 12773 Paint cachePaint; 12774 12775 if (layerType == LAYER_TYPE_NONE) { 12776 cachePaint = parent.mCachePaint; 12777 if (cachePaint == null) { 12778 cachePaint = new Paint(); 12779 cachePaint.setDither(false); 12780 parent.mCachePaint = cachePaint; 12781 } 12782 if (alpha < 1) { 12783 cachePaint.setAlpha((int) (alpha * 255)); 12784 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12785 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 12786 cachePaint.setAlpha(255); 12787 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12788 } 12789 } else { 12790 cachePaint = mLayerPaint; 12791 cachePaint.setAlpha((int) (alpha * 255)); 12792 } 12793 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 12794 } 12795 12796 if (restoreTo >= 0) { 12797 canvas.restoreToCount(restoreTo); 12798 } 12799 12800 if (a != null && !more) { 12801 if (!hardwareAccelerated && !a.getFillAfter()) { 12802 onSetAlpha(255); 12803 } 12804 parent.finishAnimatingView(this, a); 12805 } 12806 12807 if (more && hardwareAccelerated) { 12808 // invalidation is the trigger to recreate display lists, so if we're using 12809 // display lists to render, force an invalidate to allow the animation to 12810 // continue drawing another frame 12811 parent.invalidate(true); 12812 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 12813 // alpha animations should cause the child to recreate its display list 12814 invalidate(true); 12815 } 12816 } 12817 12818 mRecreateDisplayList = false; 12819 12820 return more; 12821 } 12822 12823 /** 12824 * Manually render this view (and all of its children) to the given Canvas. 12825 * The view must have already done a full layout before this function is 12826 * called. When implementing a view, implement 12827 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 12828 * If you do need to override this method, call the superclass version. 12829 * 12830 * @param canvas The Canvas to which the View is rendered. 12831 */ 12832 public void draw(Canvas canvas) { 12833 if (ViewDebug.TRACE_HIERARCHY) { 12834 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12835 } 12836 12837 final int privateFlags = mPrivateFlags; 12838 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 12839 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 12840 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 12841 12842 /* 12843 * Draw traversal performs several drawing steps which must be executed 12844 * in the appropriate order: 12845 * 12846 * 1. Draw the background 12847 * 2. If necessary, save the canvas' layers to prepare for fading 12848 * 3. Draw view's content 12849 * 4. Draw children 12850 * 5. If necessary, draw the fading edges and restore layers 12851 * 6. Draw decorations (scrollbars for instance) 12852 */ 12853 12854 // Step 1, draw the background, if needed 12855 int saveCount; 12856 12857 if (!dirtyOpaque) { 12858 final Drawable background = mBackground; 12859 if (background != null) { 12860 final int scrollX = mScrollX; 12861 final int scrollY = mScrollY; 12862 12863 if (mBackgroundSizeChanged) { 12864 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 12865 mBackgroundSizeChanged = false; 12866 } 12867 12868 if ((scrollX | scrollY) == 0) { 12869 background.draw(canvas); 12870 } else { 12871 canvas.translate(scrollX, scrollY); 12872 background.draw(canvas); 12873 canvas.translate(-scrollX, -scrollY); 12874 } 12875 } 12876 } 12877 12878 // skip step 2 & 5 if possible (common case) 12879 final int viewFlags = mViewFlags; 12880 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 12881 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 12882 if (!verticalEdges && !horizontalEdges) { 12883 // Step 3, draw the content 12884 if (!dirtyOpaque) onDraw(canvas); 12885 12886 // Step 4, draw the children 12887 dispatchDraw(canvas); 12888 12889 // Step 6, draw decorations (scrollbars) 12890 onDrawScrollBars(canvas); 12891 12892 // we're done... 12893 return; 12894 } 12895 12896 /* 12897 * Here we do the full fledged routine... 12898 * (this is an uncommon case where speed matters less, 12899 * this is why we repeat some of the tests that have been 12900 * done above) 12901 */ 12902 12903 boolean drawTop = false; 12904 boolean drawBottom = false; 12905 boolean drawLeft = false; 12906 boolean drawRight = false; 12907 12908 float topFadeStrength = 0.0f; 12909 float bottomFadeStrength = 0.0f; 12910 float leftFadeStrength = 0.0f; 12911 float rightFadeStrength = 0.0f; 12912 12913 // Step 2, save the canvas' layers 12914 int paddingLeft = mPaddingLeft; 12915 12916 final boolean offsetRequired = isPaddingOffsetRequired(); 12917 if (offsetRequired) { 12918 paddingLeft += getLeftPaddingOffset(); 12919 } 12920 12921 int left = mScrollX + paddingLeft; 12922 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 12923 int top = mScrollY + getFadeTop(offsetRequired); 12924 int bottom = top + getFadeHeight(offsetRequired); 12925 12926 if (offsetRequired) { 12927 right += getRightPaddingOffset(); 12928 bottom += getBottomPaddingOffset(); 12929 } 12930 12931 final ScrollabilityCache scrollabilityCache = mScrollCache; 12932 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 12933 int length = (int) fadeHeight; 12934 12935 // clip the fade length if top and bottom fades overlap 12936 // overlapping fades produce odd-looking artifacts 12937 if (verticalEdges && (top + length > bottom - length)) { 12938 length = (bottom - top) / 2; 12939 } 12940 12941 // also clip horizontal fades if necessary 12942 if (horizontalEdges && (left + length > right - length)) { 12943 length = (right - left) / 2; 12944 } 12945 12946 if (verticalEdges) { 12947 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 12948 drawTop = topFadeStrength * fadeHeight > 1.0f; 12949 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 12950 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 12951 } 12952 12953 if (horizontalEdges) { 12954 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 12955 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 12956 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 12957 drawRight = rightFadeStrength * fadeHeight > 1.0f; 12958 } 12959 12960 saveCount = canvas.getSaveCount(); 12961 12962 int solidColor = getSolidColor(); 12963 if (solidColor == 0) { 12964 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12965 12966 if (drawTop) { 12967 canvas.saveLayer(left, top, right, top + length, null, flags); 12968 } 12969 12970 if (drawBottom) { 12971 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 12972 } 12973 12974 if (drawLeft) { 12975 canvas.saveLayer(left, top, left + length, bottom, null, flags); 12976 } 12977 12978 if (drawRight) { 12979 canvas.saveLayer(right - length, top, right, bottom, null, flags); 12980 } 12981 } else { 12982 scrollabilityCache.setFadeColor(solidColor); 12983 } 12984 12985 // Step 3, draw the content 12986 if (!dirtyOpaque) onDraw(canvas); 12987 12988 // Step 4, draw the children 12989 dispatchDraw(canvas); 12990 12991 // Step 5, draw the fade effect and restore layers 12992 final Paint p = scrollabilityCache.paint; 12993 final Matrix matrix = scrollabilityCache.matrix; 12994 final Shader fade = scrollabilityCache.shader; 12995 12996 if (drawTop) { 12997 matrix.setScale(1, fadeHeight * topFadeStrength); 12998 matrix.postTranslate(left, top); 12999 fade.setLocalMatrix(matrix); 13000 canvas.drawRect(left, top, right, top + length, p); 13001 } 13002 13003 if (drawBottom) { 13004 matrix.setScale(1, fadeHeight * bottomFadeStrength); 13005 matrix.postRotate(180); 13006 matrix.postTranslate(left, bottom); 13007 fade.setLocalMatrix(matrix); 13008 canvas.drawRect(left, bottom - length, right, bottom, p); 13009 } 13010 13011 if (drawLeft) { 13012 matrix.setScale(1, fadeHeight * leftFadeStrength); 13013 matrix.postRotate(-90); 13014 matrix.postTranslate(left, top); 13015 fade.setLocalMatrix(matrix); 13016 canvas.drawRect(left, top, left + length, bottom, p); 13017 } 13018 13019 if (drawRight) { 13020 matrix.setScale(1, fadeHeight * rightFadeStrength); 13021 matrix.postRotate(90); 13022 matrix.postTranslate(right, top); 13023 fade.setLocalMatrix(matrix); 13024 canvas.drawRect(right - length, top, right, bottom, p); 13025 } 13026 13027 canvas.restoreToCount(saveCount); 13028 13029 // Step 6, draw decorations (scrollbars) 13030 onDrawScrollBars(canvas); 13031 } 13032 13033 /** 13034 * Override this if your view is known to always be drawn on top of a solid color background, 13035 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13036 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13037 * should be set to 0xFF. 13038 * 13039 * @see #setVerticalFadingEdgeEnabled(boolean) 13040 * @see #setHorizontalFadingEdgeEnabled(boolean) 13041 * 13042 * @return The known solid color background for this view, or 0 if the color may vary 13043 */ 13044 @ViewDebug.ExportedProperty(category = "drawing") 13045 public int getSolidColor() { 13046 return 0; 13047 } 13048 13049 /** 13050 * Build a human readable string representation of the specified view flags. 13051 * 13052 * @param flags the view flags to convert to a string 13053 * @return a String representing the supplied flags 13054 */ 13055 private static String printFlags(int flags) { 13056 String output = ""; 13057 int numFlags = 0; 13058 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13059 output += "TAKES_FOCUS"; 13060 numFlags++; 13061 } 13062 13063 switch (flags & VISIBILITY_MASK) { 13064 case INVISIBLE: 13065 if (numFlags > 0) { 13066 output += " "; 13067 } 13068 output += "INVISIBLE"; 13069 // USELESS HERE numFlags++; 13070 break; 13071 case GONE: 13072 if (numFlags > 0) { 13073 output += " "; 13074 } 13075 output += "GONE"; 13076 // USELESS HERE numFlags++; 13077 break; 13078 default: 13079 break; 13080 } 13081 return output; 13082 } 13083 13084 /** 13085 * Build a human readable string representation of the specified private 13086 * view flags. 13087 * 13088 * @param privateFlags the private view flags to convert to a string 13089 * @return a String representing the supplied flags 13090 */ 13091 private static String printPrivateFlags(int privateFlags) { 13092 String output = ""; 13093 int numFlags = 0; 13094 13095 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13096 output += "WANTS_FOCUS"; 13097 numFlags++; 13098 } 13099 13100 if ((privateFlags & FOCUSED) == FOCUSED) { 13101 if (numFlags > 0) { 13102 output += " "; 13103 } 13104 output += "FOCUSED"; 13105 numFlags++; 13106 } 13107 13108 if ((privateFlags & SELECTED) == SELECTED) { 13109 if (numFlags > 0) { 13110 output += " "; 13111 } 13112 output += "SELECTED"; 13113 numFlags++; 13114 } 13115 13116 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13117 if (numFlags > 0) { 13118 output += " "; 13119 } 13120 output += "IS_ROOT_NAMESPACE"; 13121 numFlags++; 13122 } 13123 13124 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13125 if (numFlags > 0) { 13126 output += " "; 13127 } 13128 output += "HAS_BOUNDS"; 13129 numFlags++; 13130 } 13131 13132 if ((privateFlags & DRAWN) == DRAWN) { 13133 if (numFlags > 0) { 13134 output += " "; 13135 } 13136 output += "DRAWN"; 13137 // USELESS HERE numFlags++; 13138 } 13139 return output; 13140 } 13141 13142 /** 13143 * <p>Indicates whether or not this view's layout will be requested during 13144 * the next hierarchy layout pass.</p> 13145 * 13146 * @return true if the layout will be forced during next layout pass 13147 */ 13148 public boolean isLayoutRequested() { 13149 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13150 } 13151 13152 /** 13153 * Assign a size and position to a view and all of its 13154 * descendants 13155 * 13156 * <p>This is the second phase of the layout mechanism. 13157 * (The first is measuring). In this phase, each parent calls 13158 * layout on all of its children to position them. 13159 * This is typically done using the child measurements 13160 * that were stored in the measure pass().</p> 13161 * 13162 * <p>Derived classes should not override this method. 13163 * Derived classes with children should override 13164 * onLayout. In that method, they should 13165 * call layout on each of their children.</p> 13166 * 13167 * @param l Left position, relative to parent 13168 * @param t Top position, relative to parent 13169 * @param r Right position, relative to parent 13170 * @param b Bottom position, relative to parent 13171 */ 13172 @SuppressWarnings({"unchecked"}) 13173 public void layout(int l, int t, int r, int b) { 13174 int oldL = mLeft; 13175 int oldT = mTop; 13176 int oldB = mBottom; 13177 int oldR = mRight; 13178 boolean changed = setFrame(l, t, r, b); 13179 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13180 if (ViewDebug.TRACE_HIERARCHY) { 13181 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13182 } 13183 13184 onLayout(changed, l, t, r, b); 13185 mPrivateFlags &= ~LAYOUT_REQUIRED; 13186 13187 ListenerInfo li = mListenerInfo; 13188 if (li != null && li.mOnLayoutChangeListeners != null) { 13189 ArrayList<OnLayoutChangeListener> listenersCopy = 13190 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13191 int numListeners = listenersCopy.size(); 13192 for (int i = 0; i < numListeners; ++i) { 13193 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13194 } 13195 } 13196 } 13197 mPrivateFlags &= ~FORCE_LAYOUT; 13198 } 13199 13200 /** 13201 * Called from layout when this view should 13202 * assign a size and position to each of its children. 13203 * 13204 * Derived classes with children should override 13205 * this method and call layout on each of 13206 * their children. 13207 * @param changed This is a new size or position for this view 13208 * @param left Left position, relative to parent 13209 * @param top Top position, relative to parent 13210 * @param right Right position, relative to parent 13211 * @param bottom Bottom position, relative to parent 13212 */ 13213 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13214 } 13215 13216 /** 13217 * Assign a size and position to this view. 13218 * 13219 * This is called from layout. 13220 * 13221 * @param left Left position, relative to parent 13222 * @param top Top position, relative to parent 13223 * @param right Right position, relative to parent 13224 * @param bottom Bottom position, relative to parent 13225 * @return true if the new size and position are different than the 13226 * previous ones 13227 * {@hide} 13228 */ 13229 protected boolean setFrame(int left, int top, int right, int bottom) { 13230 boolean changed = false; 13231 13232 if (DBG) { 13233 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13234 + right + "," + bottom + ")"); 13235 } 13236 13237 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13238 changed = true; 13239 13240 // Remember our drawn bit 13241 int drawn = mPrivateFlags & DRAWN; 13242 13243 int oldWidth = mRight - mLeft; 13244 int oldHeight = mBottom - mTop; 13245 int newWidth = right - left; 13246 int newHeight = bottom - top; 13247 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13248 13249 // Invalidate our old position 13250 invalidate(sizeChanged); 13251 13252 mLeft = left; 13253 mTop = top; 13254 mRight = right; 13255 mBottom = bottom; 13256 if (mDisplayList != null) { 13257 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13258 } 13259 13260 mPrivateFlags |= HAS_BOUNDS; 13261 13262 13263 if (sizeChanged) { 13264 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13265 // A change in dimension means an auto-centered pivot point changes, too 13266 if (mTransformationInfo != null) { 13267 mTransformationInfo.mMatrixDirty = true; 13268 } 13269 } 13270 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13271 } 13272 13273 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13274 // If we are visible, force the DRAWN bit to on so that 13275 // this invalidate will go through (at least to our parent). 13276 // This is because someone may have invalidated this view 13277 // before this call to setFrame came in, thereby clearing 13278 // the DRAWN bit. 13279 mPrivateFlags |= DRAWN; 13280 invalidate(sizeChanged); 13281 // parent display list may need to be recreated based on a change in the bounds 13282 // of any child 13283 invalidateParentCaches(); 13284 } 13285 13286 // Reset drawn bit to original value (invalidate turns it off) 13287 mPrivateFlags |= drawn; 13288 13289 mBackgroundSizeChanged = true; 13290 } 13291 return changed; 13292 } 13293 13294 /** 13295 * Finalize inflating a view from XML. This is called as the last phase 13296 * of inflation, after all child views have been added. 13297 * 13298 * <p>Even if the subclass overrides onFinishInflate, they should always be 13299 * sure to call the super method, so that we get called. 13300 */ 13301 protected void onFinishInflate() { 13302 } 13303 13304 /** 13305 * Returns the resources associated with this view. 13306 * 13307 * @return Resources object. 13308 */ 13309 public Resources getResources() { 13310 return mResources; 13311 } 13312 13313 /** 13314 * Invalidates the specified Drawable. 13315 * 13316 * @param drawable the drawable to invalidate 13317 */ 13318 public void invalidateDrawable(Drawable drawable) { 13319 if (verifyDrawable(drawable)) { 13320 final Rect dirty = drawable.getBounds(); 13321 final int scrollX = mScrollX; 13322 final int scrollY = mScrollY; 13323 13324 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13325 dirty.right + scrollX, dirty.bottom + scrollY); 13326 } 13327 } 13328 13329 /** 13330 * Schedules an action on a drawable to occur at a specified time. 13331 * 13332 * @param who the recipient of the action 13333 * @param what the action to run on the drawable 13334 * @param when the time at which the action must occur. Uses the 13335 * {@link SystemClock#uptimeMillis} timebase. 13336 */ 13337 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13338 if (verifyDrawable(who) && what != null) { 13339 final long delay = when - SystemClock.uptimeMillis(); 13340 if (mAttachInfo != null) { 13341 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13342 Choreographer.CALLBACK_ANIMATION, what, who, 13343 Choreographer.subtractFrameDelay(delay)); 13344 } else { 13345 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13346 } 13347 } 13348 } 13349 13350 /** 13351 * Cancels a scheduled action on a drawable. 13352 * 13353 * @param who the recipient of the action 13354 * @param what the action to cancel 13355 */ 13356 public void unscheduleDrawable(Drawable who, Runnable what) { 13357 if (verifyDrawable(who) && what != null) { 13358 if (mAttachInfo != null) { 13359 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13360 Choreographer.CALLBACK_ANIMATION, what, who); 13361 } else { 13362 ViewRootImpl.getRunQueue().removeCallbacks(what); 13363 } 13364 } 13365 } 13366 13367 /** 13368 * Unschedule any events associated with the given Drawable. This can be 13369 * used when selecting a new Drawable into a view, so that the previous 13370 * one is completely unscheduled. 13371 * 13372 * @param who The Drawable to unschedule. 13373 * 13374 * @see #drawableStateChanged 13375 */ 13376 public void unscheduleDrawable(Drawable who) { 13377 if (mAttachInfo != null && who != null) { 13378 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13379 Choreographer.CALLBACK_ANIMATION, null, who); 13380 } 13381 } 13382 13383 /** 13384 * Return the layout direction of a given Drawable. 13385 * 13386 * @param who the Drawable to query 13387 * @hide 13388 */ 13389 public int getResolvedLayoutDirection(Drawable who) { 13390 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13391 } 13392 13393 /** 13394 * If your view subclass is displaying its own Drawable objects, it should 13395 * override this function and return true for any Drawable it is 13396 * displaying. This allows animations for those drawables to be 13397 * scheduled. 13398 * 13399 * <p>Be sure to call through to the super class when overriding this 13400 * function. 13401 * 13402 * @param who The Drawable to verify. Return true if it is one you are 13403 * displaying, else return the result of calling through to the 13404 * super class. 13405 * 13406 * @return boolean If true than the Drawable is being displayed in the 13407 * view; else false and it is not allowed to animate. 13408 * 13409 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13410 * @see #drawableStateChanged() 13411 */ 13412 protected boolean verifyDrawable(Drawable who) { 13413 return who == mBackground; 13414 } 13415 13416 /** 13417 * This function is called whenever the state of the view changes in such 13418 * a way that it impacts the state of drawables being shown. 13419 * 13420 * <p>Be sure to call through to the superclass when overriding this 13421 * function. 13422 * 13423 * @see Drawable#setState(int[]) 13424 */ 13425 protected void drawableStateChanged() { 13426 Drawable d = mBackground; 13427 if (d != null && d.isStateful()) { 13428 d.setState(getDrawableState()); 13429 } 13430 } 13431 13432 /** 13433 * Call this to force a view to update its drawable state. This will cause 13434 * drawableStateChanged to be called on this view. Views that are interested 13435 * in the new state should call getDrawableState. 13436 * 13437 * @see #drawableStateChanged 13438 * @see #getDrawableState 13439 */ 13440 public void refreshDrawableState() { 13441 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13442 drawableStateChanged(); 13443 13444 ViewParent parent = mParent; 13445 if (parent != null) { 13446 parent.childDrawableStateChanged(this); 13447 } 13448 } 13449 13450 /** 13451 * Return an array of resource IDs of the drawable states representing the 13452 * current state of the view. 13453 * 13454 * @return The current drawable state 13455 * 13456 * @see Drawable#setState(int[]) 13457 * @see #drawableStateChanged() 13458 * @see #onCreateDrawableState(int) 13459 */ 13460 public final int[] getDrawableState() { 13461 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13462 return mDrawableState; 13463 } else { 13464 mDrawableState = onCreateDrawableState(0); 13465 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13466 return mDrawableState; 13467 } 13468 } 13469 13470 /** 13471 * Generate the new {@link android.graphics.drawable.Drawable} state for 13472 * this view. This is called by the view 13473 * system when the cached Drawable state is determined to be invalid. To 13474 * retrieve the current state, you should use {@link #getDrawableState}. 13475 * 13476 * @param extraSpace if non-zero, this is the number of extra entries you 13477 * would like in the returned array in which you can place your own 13478 * states. 13479 * 13480 * @return Returns an array holding the current {@link Drawable} state of 13481 * the view. 13482 * 13483 * @see #mergeDrawableStates(int[], int[]) 13484 */ 13485 protected int[] onCreateDrawableState(int extraSpace) { 13486 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13487 mParent instanceof View) { 13488 return ((View) mParent).onCreateDrawableState(extraSpace); 13489 } 13490 13491 int[] drawableState; 13492 13493 int privateFlags = mPrivateFlags; 13494 13495 int viewStateIndex = 0; 13496 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13497 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13498 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13499 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13500 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13501 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13502 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13503 HardwareRenderer.isAvailable()) { 13504 // This is set if HW acceleration is requested, even if the current 13505 // process doesn't allow it. This is just to allow app preview 13506 // windows to better match their app. 13507 viewStateIndex |= VIEW_STATE_ACCELERATED; 13508 } 13509 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13510 13511 final int privateFlags2 = mPrivateFlags2; 13512 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13513 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13514 13515 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13516 13517 //noinspection ConstantIfStatement 13518 if (false) { 13519 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13520 Log.i("View", toString() 13521 + " pressed=" + ((privateFlags & PRESSED) != 0) 13522 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13523 + " fo=" + hasFocus() 13524 + " sl=" + ((privateFlags & SELECTED) != 0) 13525 + " wf=" + hasWindowFocus() 13526 + ": " + Arrays.toString(drawableState)); 13527 } 13528 13529 if (extraSpace == 0) { 13530 return drawableState; 13531 } 13532 13533 final int[] fullState; 13534 if (drawableState != null) { 13535 fullState = new int[drawableState.length + extraSpace]; 13536 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13537 } else { 13538 fullState = new int[extraSpace]; 13539 } 13540 13541 return fullState; 13542 } 13543 13544 /** 13545 * Merge your own state values in <var>additionalState</var> into the base 13546 * state values <var>baseState</var> that were returned by 13547 * {@link #onCreateDrawableState(int)}. 13548 * 13549 * @param baseState The base state values returned by 13550 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13551 * own additional state values. 13552 * 13553 * @param additionalState The additional state values you would like 13554 * added to <var>baseState</var>; this array is not modified. 13555 * 13556 * @return As a convenience, the <var>baseState</var> array you originally 13557 * passed into the function is returned. 13558 * 13559 * @see #onCreateDrawableState(int) 13560 */ 13561 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13562 final int N = baseState.length; 13563 int i = N - 1; 13564 while (i >= 0 && baseState[i] == 0) { 13565 i--; 13566 } 13567 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13568 return baseState; 13569 } 13570 13571 /** 13572 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13573 * on all Drawable objects associated with this view. 13574 */ 13575 public void jumpDrawablesToCurrentState() { 13576 if (mBackground != null) { 13577 mBackground.jumpToCurrentState(); 13578 } 13579 } 13580 13581 /** 13582 * Sets the background color for this view. 13583 * @param color the color of the background 13584 */ 13585 @RemotableViewMethod 13586 public void setBackgroundColor(int color) { 13587 if (mBackground instanceof ColorDrawable) { 13588 ((ColorDrawable) mBackground).setColor(color); 13589 } else { 13590 setBackground(new ColorDrawable(color)); 13591 } 13592 } 13593 13594 /** 13595 * Set the background to a given resource. The resource should refer to 13596 * a Drawable object or 0 to remove the background. 13597 * @param resid The identifier of the resource. 13598 * 13599 * @attr ref android.R.styleable#View_background 13600 */ 13601 @RemotableViewMethod 13602 public void setBackgroundResource(int resid) { 13603 if (resid != 0 && resid == mBackgroundResource) { 13604 return; 13605 } 13606 13607 Drawable d= null; 13608 if (resid != 0) { 13609 d = mResources.getDrawable(resid); 13610 } 13611 setBackground(d); 13612 13613 mBackgroundResource = resid; 13614 } 13615 13616 /** 13617 * Set the background to a given Drawable, or remove the background. If the 13618 * background has padding, this View's padding is set to the background's 13619 * padding. However, when a background is removed, this View's padding isn't 13620 * touched. If setting the padding is desired, please use 13621 * {@link #setPadding(int, int, int, int)}. 13622 * 13623 * @param background The Drawable to use as the background, or null to remove the 13624 * background 13625 */ 13626 public void setBackground(Drawable background) { 13627 //noinspection deprecation 13628 setBackgroundDrawable(background); 13629 } 13630 13631 /** 13632 * @deprecated use {@link #setBackground(Drawable)} instead 13633 */ 13634 @Deprecated 13635 public void setBackgroundDrawable(Drawable background) { 13636 if (background == mBackground) { 13637 return; 13638 } 13639 13640 boolean requestLayout = false; 13641 13642 mBackgroundResource = 0; 13643 13644 /* 13645 * Regardless of whether we're setting a new background or not, we want 13646 * to clear the previous drawable. 13647 */ 13648 if (mBackground != null) { 13649 mBackground.setCallback(null); 13650 unscheduleDrawable(mBackground); 13651 } 13652 13653 if (background != null) { 13654 Rect padding = sThreadLocal.get(); 13655 if (padding == null) { 13656 padding = new Rect(); 13657 sThreadLocal.set(padding); 13658 } 13659 if (background.getPadding(padding)) { 13660 switch (background.getResolvedLayoutDirectionSelf()) { 13661 case LAYOUT_DIRECTION_RTL: 13662 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13663 break; 13664 case LAYOUT_DIRECTION_LTR: 13665 default: 13666 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13667 } 13668 } 13669 13670 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13671 // if it has a different minimum size, we should layout again 13672 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13673 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13674 requestLayout = true; 13675 } 13676 13677 background.setCallback(this); 13678 if (background.isStateful()) { 13679 background.setState(getDrawableState()); 13680 } 13681 background.setVisible(getVisibility() == VISIBLE, false); 13682 mBackground = background; 13683 13684 if ((mPrivateFlags & SKIP_DRAW) != 0) { 13685 mPrivateFlags &= ~SKIP_DRAW; 13686 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 13687 requestLayout = true; 13688 } 13689 } else { 13690 /* Remove the background */ 13691 mBackground = null; 13692 13693 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 13694 /* 13695 * This view ONLY drew the background before and we're removing 13696 * the background, so now it won't draw anything 13697 * (hence we SKIP_DRAW) 13698 */ 13699 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 13700 mPrivateFlags |= SKIP_DRAW; 13701 } 13702 13703 /* 13704 * When the background is set, we try to apply its padding to this 13705 * View. When the background is removed, we don't touch this View's 13706 * padding. This is noted in the Javadocs. Hence, we don't need to 13707 * requestLayout(), the invalidate() below is sufficient. 13708 */ 13709 13710 // The old background's minimum size could have affected this 13711 // View's layout, so let's requestLayout 13712 requestLayout = true; 13713 } 13714 13715 computeOpaqueFlags(); 13716 13717 if (requestLayout) { 13718 requestLayout(); 13719 } 13720 13721 mBackgroundSizeChanged = true; 13722 invalidate(true); 13723 } 13724 13725 /** 13726 * Gets the background drawable 13727 * 13728 * @return The drawable used as the background for this view, if any. 13729 * 13730 * @see #setBackground(Drawable) 13731 * 13732 * @attr ref android.R.styleable#View_background 13733 */ 13734 public Drawable getBackground() { 13735 return mBackground; 13736 } 13737 13738 /** 13739 * Sets the padding. The view may add on the space required to display 13740 * the scrollbars, depending on the style and visibility of the scrollbars. 13741 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 13742 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 13743 * from the values set in this call. 13744 * 13745 * @attr ref android.R.styleable#View_padding 13746 * @attr ref android.R.styleable#View_paddingBottom 13747 * @attr ref android.R.styleable#View_paddingLeft 13748 * @attr ref android.R.styleable#View_paddingRight 13749 * @attr ref android.R.styleable#View_paddingTop 13750 * @param left the left padding in pixels 13751 * @param top the top padding in pixels 13752 * @param right the right padding in pixels 13753 * @param bottom the bottom padding in pixels 13754 */ 13755 public void setPadding(int left, int top, int right, int bottom) { 13756 mUserPaddingStart = -1; 13757 mUserPaddingEnd = -1; 13758 mUserPaddingRelative = false; 13759 13760 internalSetPadding(left, top, right, bottom); 13761 } 13762 13763 private void internalSetPadding(int left, int top, int right, int bottom) { 13764 mUserPaddingLeft = left; 13765 mUserPaddingRight = right; 13766 mUserPaddingBottom = bottom; 13767 13768 final int viewFlags = mViewFlags; 13769 boolean changed = false; 13770 13771 // Common case is there are no scroll bars. 13772 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 13773 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 13774 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 13775 ? 0 : getVerticalScrollbarWidth(); 13776 switch (mVerticalScrollbarPosition) { 13777 case SCROLLBAR_POSITION_DEFAULT: 13778 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 13779 left += offset; 13780 } else { 13781 right += offset; 13782 } 13783 break; 13784 case SCROLLBAR_POSITION_RIGHT: 13785 right += offset; 13786 break; 13787 case SCROLLBAR_POSITION_LEFT: 13788 left += offset; 13789 break; 13790 } 13791 } 13792 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 13793 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 13794 ? 0 : getHorizontalScrollbarHeight(); 13795 } 13796 } 13797 13798 if (mPaddingLeft != left) { 13799 changed = true; 13800 mPaddingLeft = left; 13801 } 13802 if (mPaddingTop != top) { 13803 changed = true; 13804 mPaddingTop = top; 13805 } 13806 if (mPaddingRight != right) { 13807 changed = true; 13808 mPaddingRight = right; 13809 } 13810 if (mPaddingBottom != bottom) { 13811 changed = true; 13812 mPaddingBottom = bottom; 13813 } 13814 13815 if (changed) { 13816 requestLayout(); 13817 } 13818 } 13819 13820 /** 13821 * Sets the relative padding. The view may add on the space required to display 13822 * the scrollbars, depending on the style and visibility of the scrollbars. 13823 * from the values set in this call. 13824 * 13825 * @param start the start padding in pixels 13826 * @param top the top padding in pixels 13827 * @param end the end padding in pixels 13828 * @param bottom the bottom padding in pixels 13829 * @hide 13830 */ 13831 public void setPaddingRelative(int start, int top, int end, int bottom) { 13832 mUserPaddingStart = start; 13833 mUserPaddingEnd = end; 13834 mUserPaddingRelative = true; 13835 13836 switch(getResolvedLayoutDirection()) { 13837 case LAYOUT_DIRECTION_RTL: 13838 internalSetPadding(end, top, start, bottom); 13839 break; 13840 case LAYOUT_DIRECTION_LTR: 13841 default: 13842 internalSetPadding(start, top, end, bottom); 13843 } 13844 } 13845 13846 /** 13847 * Returns the top padding of this view. 13848 * 13849 * @return the top padding in pixels 13850 */ 13851 public int getPaddingTop() { 13852 return mPaddingTop; 13853 } 13854 13855 /** 13856 * Returns the bottom padding of this view. If there are inset and enabled 13857 * scrollbars, this value may include the space required to display the 13858 * scrollbars as well. 13859 * 13860 * @return the bottom padding in pixels 13861 */ 13862 public int getPaddingBottom() { 13863 return mPaddingBottom; 13864 } 13865 13866 /** 13867 * Returns the left padding of this view. If there are inset and enabled 13868 * scrollbars, this value may include the space required to display the 13869 * scrollbars as well. 13870 * 13871 * @return the left padding in pixels 13872 */ 13873 public int getPaddingLeft() { 13874 return mPaddingLeft; 13875 } 13876 13877 /** 13878 * Returns the start padding of this view depending on its resolved layout direction. 13879 * If there are inset and enabled scrollbars, this value may include the space 13880 * required to display the scrollbars as well. 13881 * 13882 * @return the start padding in pixels 13883 * @hide 13884 */ 13885 public int getPaddingStart() { 13886 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 13887 mPaddingRight : mPaddingLeft; 13888 } 13889 13890 /** 13891 * Returns the right padding of this view. If there are inset and enabled 13892 * scrollbars, this value may include the space required to display the 13893 * scrollbars as well. 13894 * 13895 * @return the right padding in pixels 13896 */ 13897 public int getPaddingRight() { 13898 return mPaddingRight; 13899 } 13900 13901 /** 13902 * Returns the end padding of this view depending on its resolved layout direction. 13903 * If there are inset and enabled scrollbars, this value may include the space 13904 * required to display the scrollbars as well. 13905 * 13906 * @return the end padding in pixels 13907 * @hide 13908 */ 13909 public int getPaddingEnd() { 13910 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 13911 mPaddingLeft : mPaddingRight; 13912 } 13913 13914 /** 13915 * Return if the padding as been set thru relative values 13916 * {@link #setPaddingRelative(int, int, int, int)} 13917 * 13918 * @return true if the padding is relative or false if it is not. 13919 * @hide 13920 */ 13921 public boolean isPaddingRelative() { 13922 return mUserPaddingRelative; 13923 } 13924 13925 /** 13926 * @hide 13927 */ 13928 public Insets getOpticalInsets() { 13929 if (mLayoutInsets == null) { 13930 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 13931 } 13932 return mLayoutInsets; 13933 } 13934 13935 /** 13936 * @hide 13937 */ 13938 public void setLayoutInsets(Insets layoutInsets) { 13939 mLayoutInsets = layoutInsets; 13940 } 13941 13942 /** 13943 * Changes the selection state of this view. A view can be selected or not. 13944 * Note that selection is not the same as focus. Views are typically 13945 * selected in the context of an AdapterView like ListView or GridView; 13946 * the selected view is the view that is highlighted. 13947 * 13948 * @param selected true if the view must be selected, false otherwise 13949 */ 13950 public void setSelected(boolean selected) { 13951 if (((mPrivateFlags & SELECTED) != 0) != selected) { 13952 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 13953 if (!selected) resetPressedState(); 13954 invalidate(true); 13955 refreshDrawableState(); 13956 dispatchSetSelected(selected); 13957 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 13958 notifyAccessibilityStateChanged(); 13959 } 13960 } 13961 } 13962 13963 /** 13964 * Dispatch setSelected to all of this View's children. 13965 * 13966 * @see #setSelected(boolean) 13967 * 13968 * @param selected The new selected state 13969 */ 13970 protected void dispatchSetSelected(boolean selected) { 13971 } 13972 13973 /** 13974 * Indicates the selection state of this view. 13975 * 13976 * @return true if the view is selected, false otherwise 13977 */ 13978 @ViewDebug.ExportedProperty 13979 public boolean isSelected() { 13980 return (mPrivateFlags & SELECTED) != 0; 13981 } 13982 13983 /** 13984 * Changes the activated state of this view. A view can be activated or not. 13985 * Note that activation is not the same as selection. Selection is 13986 * a transient property, representing the view (hierarchy) the user is 13987 * currently interacting with. Activation is a longer-term state that the 13988 * user can move views in and out of. For example, in a list view with 13989 * single or multiple selection enabled, the views in the current selection 13990 * set are activated. (Um, yeah, we are deeply sorry about the terminology 13991 * here.) The activated state is propagated down to children of the view it 13992 * is set on. 13993 * 13994 * @param activated true if the view must be activated, false otherwise 13995 */ 13996 public void setActivated(boolean activated) { 13997 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 13998 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 13999 invalidate(true); 14000 refreshDrawableState(); 14001 dispatchSetActivated(activated); 14002 } 14003 } 14004 14005 /** 14006 * Dispatch setActivated to all of this View's children. 14007 * 14008 * @see #setActivated(boolean) 14009 * 14010 * @param activated The new activated state 14011 */ 14012 protected void dispatchSetActivated(boolean activated) { 14013 } 14014 14015 /** 14016 * Indicates the activation state of this view. 14017 * 14018 * @return true if the view is activated, false otherwise 14019 */ 14020 @ViewDebug.ExportedProperty 14021 public boolean isActivated() { 14022 return (mPrivateFlags & ACTIVATED) != 0; 14023 } 14024 14025 /** 14026 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14027 * observer can be used to get notifications when global events, like 14028 * layout, happen. 14029 * 14030 * The returned ViewTreeObserver observer is not guaranteed to remain 14031 * valid for the lifetime of this View. If the caller of this method keeps 14032 * a long-lived reference to ViewTreeObserver, it should always check for 14033 * the return value of {@link ViewTreeObserver#isAlive()}. 14034 * 14035 * @return The ViewTreeObserver for this view's hierarchy. 14036 */ 14037 public ViewTreeObserver getViewTreeObserver() { 14038 if (mAttachInfo != null) { 14039 return mAttachInfo.mTreeObserver; 14040 } 14041 if (mFloatingTreeObserver == null) { 14042 mFloatingTreeObserver = new ViewTreeObserver(); 14043 } 14044 return mFloatingTreeObserver; 14045 } 14046 14047 /** 14048 * <p>Finds the topmost view in the current view hierarchy.</p> 14049 * 14050 * @return the topmost view containing this view 14051 */ 14052 public View getRootView() { 14053 if (mAttachInfo != null) { 14054 final View v = mAttachInfo.mRootView; 14055 if (v != null) { 14056 return v; 14057 } 14058 } 14059 14060 View parent = this; 14061 14062 while (parent.mParent != null && parent.mParent instanceof View) { 14063 parent = (View) parent.mParent; 14064 } 14065 14066 return parent; 14067 } 14068 14069 /** 14070 * <p>Computes the coordinates of this view on the screen. The argument 14071 * must be an array of two integers. After the method returns, the array 14072 * contains the x and y location in that order.</p> 14073 * 14074 * @param location an array of two integers in which to hold the coordinates 14075 */ 14076 public void getLocationOnScreen(int[] location) { 14077 getLocationInWindow(location); 14078 14079 final AttachInfo info = mAttachInfo; 14080 if (info != null) { 14081 location[0] += info.mWindowLeft; 14082 location[1] += info.mWindowTop; 14083 } 14084 } 14085 14086 /** 14087 * <p>Computes the coordinates of this view in its window. The argument 14088 * must be an array of two integers. After the method returns, the array 14089 * contains the x and y location in that order.</p> 14090 * 14091 * @param location an array of two integers in which to hold the coordinates 14092 */ 14093 public void getLocationInWindow(int[] location) { 14094 if (location == null || location.length < 2) { 14095 throw new IllegalArgumentException("location must be an array of two integers"); 14096 } 14097 14098 if (mAttachInfo == null) { 14099 // When the view is not attached to a window, this method does not make sense 14100 location[0] = location[1] = 0; 14101 return; 14102 } 14103 14104 float[] position = mAttachInfo.mTmpTransformLocation; 14105 position[0] = position[1] = 0.0f; 14106 14107 if (!hasIdentityMatrix()) { 14108 getMatrix().mapPoints(position); 14109 } 14110 14111 position[0] += mLeft; 14112 position[1] += mTop; 14113 14114 ViewParent viewParent = mParent; 14115 while (viewParent instanceof View) { 14116 final View view = (View) viewParent; 14117 14118 position[0] -= view.mScrollX; 14119 position[1] -= view.mScrollY; 14120 14121 if (!view.hasIdentityMatrix()) { 14122 view.getMatrix().mapPoints(position); 14123 } 14124 14125 position[0] += view.mLeft; 14126 position[1] += view.mTop; 14127 14128 viewParent = view.mParent; 14129 } 14130 14131 if (viewParent instanceof ViewRootImpl) { 14132 // *cough* 14133 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14134 position[1] -= vr.mCurScrollY; 14135 } 14136 14137 location[0] = (int) (position[0] + 0.5f); 14138 location[1] = (int) (position[1] + 0.5f); 14139 } 14140 14141 /** 14142 * {@hide} 14143 * @param id the id of the view to be found 14144 * @return the view of the specified id, null if cannot be found 14145 */ 14146 protected View findViewTraversal(int id) { 14147 if (id == mID) { 14148 return this; 14149 } 14150 return null; 14151 } 14152 14153 /** 14154 * {@hide} 14155 * @param tag the tag of the view to be found 14156 * @return the view of specified tag, null if cannot be found 14157 */ 14158 protected View findViewWithTagTraversal(Object tag) { 14159 if (tag != null && tag.equals(mTag)) { 14160 return this; 14161 } 14162 return null; 14163 } 14164 14165 /** 14166 * {@hide} 14167 * @param predicate The predicate to evaluate. 14168 * @param childToSkip If not null, ignores this child during the recursive traversal. 14169 * @return The first view that matches the predicate or null. 14170 */ 14171 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14172 if (predicate.apply(this)) { 14173 return this; 14174 } 14175 return null; 14176 } 14177 14178 /** 14179 * Look for a child view with the given id. If this view has the given 14180 * id, return this view. 14181 * 14182 * @param id The id to search for. 14183 * @return The view that has the given id in the hierarchy or null 14184 */ 14185 public final View findViewById(int id) { 14186 if (id < 0) { 14187 return null; 14188 } 14189 return findViewTraversal(id); 14190 } 14191 14192 /** 14193 * Finds a view by its unuque and stable accessibility id. 14194 * 14195 * @param accessibilityId The searched accessibility id. 14196 * @return The found view. 14197 */ 14198 final View findViewByAccessibilityId(int accessibilityId) { 14199 if (accessibilityId < 0) { 14200 return null; 14201 } 14202 return findViewByAccessibilityIdTraversal(accessibilityId); 14203 } 14204 14205 /** 14206 * Performs the traversal to find a view by its unuque and stable accessibility id. 14207 * 14208 * <strong>Note:</strong>This method does not stop at the root namespace 14209 * boundary since the user can touch the screen at an arbitrary location 14210 * potentially crossing the root namespace bounday which will send an 14211 * accessibility event to accessibility services and they should be able 14212 * to obtain the event source. Also accessibility ids are guaranteed to be 14213 * unique in the window. 14214 * 14215 * @param accessibilityId The accessibility id. 14216 * @return The found view. 14217 */ 14218 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14219 if (getAccessibilityViewId() == accessibilityId) { 14220 return this; 14221 } 14222 return null; 14223 } 14224 14225 /** 14226 * Look for a child view with the given tag. If this view has the given 14227 * tag, return this view. 14228 * 14229 * @param tag The tag to search for, using "tag.equals(getTag())". 14230 * @return The View that has the given tag in the hierarchy or null 14231 */ 14232 public final View findViewWithTag(Object tag) { 14233 if (tag == null) { 14234 return null; 14235 } 14236 return findViewWithTagTraversal(tag); 14237 } 14238 14239 /** 14240 * {@hide} 14241 * Look for a child view that matches the specified predicate. 14242 * If this view matches the predicate, return this view. 14243 * 14244 * @param predicate The predicate to evaluate. 14245 * @return The first view that matches the predicate or null. 14246 */ 14247 public final View findViewByPredicate(Predicate<View> predicate) { 14248 return findViewByPredicateTraversal(predicate, null); 14249 } 14250 14251 /** 14252 * {@hide} 14253 * Look for a child view that matches the specified predicate, 14254 * starting with the specified view and its descendents and then 14255 * recusively searching the ancestors and siblings of that view 14256 * until this view is reached. 14257 * 14258 * This method is useful in cases where the predicate does not match 14259 * a single unique view (perhaps multiple views use the same id) 14260 * and we are trying to find the view that is "closest" in scope to the 14261 * starting view. 14262 * 14263 * @param start The view to start from. 14264 * @param predicate The predicate to evaluate. 14265 * @return The first view that matches the predicate or null. 14266 */ 14267 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14268 View childToSkip = null; 14269 for (;;) { 14270 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14271 if (view != null || start == this) { 14272 return view; 14273 } 14274 14275 ViewParent parent = start.getParent(); 14276 if (parent == null || !(parent instanceof View)) { 14277 return null; 14278 } 14279 14280 childToSkip = start; 14281 start = (View) parent; 14282 } 14283 } 14284 14285 /** 14286 * Sets the identifier for this view. The identifier does not have to be 14287 * unique in this view's hierarchy. The identifier should be a positive 14288 * number. 14289 * 14290 * @see #NO_ID 14291 * @see #getId() 14292 * @see #findViewById(int) 14293 * 14294 * @param id a number used to identify the view 14295 * 14296 * @attr ref android.R.styleable#View_id 14297 */ 14298 public void setId(int id) { 14299 mID = id; 14300 } 14301 14302 /** 14303 * {@hide} 14304 * 14305 * @param isRoot true if the view belongs to the root namespace, false 14306 * otherwise 14307 */ 14308 public void setIsRootNamespace(boolean isRoot) { 14309 if (isRoot) { 14310 mPrivateFlags |= IS_ROOT_NAMESPACE; 14311 } else { 14312 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14313 } 14314 } 14315 14316 /** 14317 * {@hide} 14318 * 14319 * @return true if the view belongs to the root namespace, false otherwise 14320 */ 14321 public boolean isRootNamespace() { 14322 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14323 } 14324 14325 /** 14326 * Returns this view's identifier. 14327 * 14328 * @return a positive integer used to identify the view or {@link #NO_ID} 14329 * if the view has no ID 14330 * 14331 * @see #setId(int) 14332 * @see #findViewById(int) 14333 * @attr ref android.R.styleable#View_id 14334 */ 14335 @ViewDebug.CapturedViewProperty 14336 public int getId() { 14337 return mID; 14338 } 14339 14340 /** 14341 * Returns this view's tag. 14342 * 14343 * @return the Object stored in this view as a tag 14344 * 14345 * @see #setTag(Object) 14346 * @see #getTag(int) 14347 */ 14348 @ViewDebug.ExportedProperty 14349 public Object getTag() { 14350 return mTag; 14351 } 14352 14353 /** 14354 * Sets the tag associated with this view. A tag can be used to mark 14355 * a view in its hierarchy and does not have to be unique within the 14356 * hierarchy. Tags can also be used to store data within a view without 14357 * resorting to another data structure. 14358 * 14359 * @param tag an Object to tag the view with 14360 * 14361 * @see #getTag() 14362 * @see #setTag(int, Object) 14363 */ 14364 public void setTag(final Object tag) { 14365 mTag = tag; 14366 } 14367 14368 /** 14369 * Returns the tag associated with this view and the specified key. 14370 * 14371 * @param key The key identifying the tag 14372 * 14373 * @return the Object stored in this view as a tag 14374 * 14375 * @see #setTag(int, Object) 14376 * @see #getTag() 14377 */ 14378 public Object getTag(int key) { 14379 if (mKeyedTags != null) return mKeyedTags.get(key); 14380 return null; 14381 } 14382 14383 /** 14384 * Sets a tag associated with this view and a key. A tag can be used 14385 * to mark a view in its hierarchy and does not have to be unique within 14386 * the hierarchy. Tags can also be used to store data within a view 14387 * without resorting to another data structure. 14388 * 14389 * The specified key should be an id declared in the resources of the 14390 * application to ensure it is unique (see the <a 14391 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14392 * Keys identified as belonging to 14393 * the Android framework or not associated with any package will cause 14394 * an {@link IllegalArgumentException} to be thrown. 14395 * 14396 * @param key The key identifying the tag 14397 * @param tag An Object to tag the view with 14398 * 14399 * @throws IllegalArgumentException If they specified key is not valid 14400 * 14401 * @see #setTag(Object) 14402 * @see #getTag(int) 14403 */ 14404 public void setTag(int key, final Object tag) { 14405 // If the package id is 0x00 or 0x01, it's either an undefined package 14406 // or a framework id 14407 if ((key >>> 24) < 2) { 14408 throw new IllegalArgumentException("The key must be an application-specific " 14409 + "resource id."); 14410 } 14411 14412 setKeyedTag(key, tag); 14413 } 14414 14415 /** 14416 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14417 * framework id. 14418 * 14419 * @hide 14420 */ 14421 public void setTagInternal(int key, Object tag) { 14422 if ((key >>> 24) != 0x1) { 14423 throw new IllegalArgumentException("The key must be a framework-specific " 14424 + "resource id."); 14425 } 14426 14427 setKeyedTag(key, tag); 14428 } 14429 14430 private void setKeyedTag(int key, Object tag) { 14431 if (mKeyedTags == null) { 14432 mKeyedTags = new SparseArray<Object>(); 14433 } 14434 14435 mKeyedTags.put(key, tag); 14436 } 14437 14438 /** 14439 * @param consistency The type of consistency. See ViewDebug for more information. 14440 * 14441 * @hide 14442 */ 14443 protected boolean dispatchConsistencyCheck(int consistency) { 14444 return onConsistencyCheck(consistency); 14445 } 14446 14447 /** 14448 * Method that subclasses should implement to check their consistency. The type of 14449 * consistency check is indicated by the bit field passed as a parameter. 14450 * 14451 * @param consistency The type of consistency. See ViewDebug for more information. 14452 * 14453 * @throws IllegalStateException if the view is in an inconsistent state. 14454 * 14455 * @hide 14456 */ 14457 protected boolean onConsistencyCheck(int consistency) { 14458 boolean result = true; 14459 14460 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14461 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14462 14463 if (checkLayout) { 14464 if (getParent() == null) { 14465 result = false; 14466 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14467 "View " + this + " does not have a parent."); 14468 } 14469 14470 if (mAttachInfo == null) { 14471 result = false; 14472 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14473 "View " + this + " is not attached to a window."); 14474 } 14475 } 14476 14477 if (checkDrawing) { 14478 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14479 // from their draw() method 14480 14481 if ((mPrivateFlags & DRAWN) != DRAWN && 14482 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14483 result = false; 14484 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14485 "View " + this + " was invalidated but its drawing cache is valid."); 14486 } 14487 } 14488 14489 return result; 14490 } 14491 14492 /** 14493 * Prints information about this view in the log output, with the tag 14494 * {@link #VIEW_LOG_TAG}. 14495 * 14496 * @hide 14497 */ 14498 public void debug() { 14499 debug(0); 14500 } 14501 14502 /** 14503 * Prints information about this view in the log output, with the tag 14504 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14505 * indentation defined by the <code>depth</code>. 14506 * 14507 * @param depth the indentation level 14508 * 14509 * @hide 14510 */ 14511 protected void debug(int depth) { 14512 String output = debugIndent(depth - 1); 14513 14514 output += "+ " + this; 14515 int id = getId(); 14516 if (id != -1) { 14517 output += " (id=" + id + ")"; 14518 } 14519 Object tag = getTag(); 14520 if (tag != null) { 14521 output += " (tag=" + tag + ")"; 14522 } 14523 Log.d(VIEW_LOG_TAG, output); 14524 14525 if ((mPrivateFlags & FOCUSED) != 0) { 14526 output = debugIndent(depth) + " FOCUSED"; 14527 Log.d(VIEW_LOG_TAG, output); 14528 } 14529 14530 output = debugIndent(depth); 14531 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14532 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14533 + "} "; 14534 Log.d(VIEW_LOG_TAG, output); 14535 14536 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14537 || mPaddingBottom != 0) { 14538 output = debugIndent(depth); 14539 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14540 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14541 Log.d(VIEW_LOG_TAG, output); 14542 } 14543 14544 output = debugIndent(depth); 14545 output += "mMeasureWidth=" + mMeasuredWidth + 14546 " mMeasureHeight=" + mMeasuredHeight; 14547 Log.d(VIEW_LOG_TAG, output); 14548 14549 output = debugIndent(depth); 14550 if (mLayoutParams == null) { 14551 output += "BAD! no layout params"; 14552 } else { 14553 output = mLayoutParams.debug(output); 14554 } 14555 Log.d(VIEW_LOG_TAG, output); 14556 14557 output = debugIndent(depth); 14558 output += "flags={"; 14559 output += View.printFlags(mViewFlags); 14560 output += "}"; 14561 Log.d(VIEW_LOG_TAG, output); 14562 14563 output = debugIndent(depth); 14564 output += "privateFlags={"; 14565 output += View.printPrivateFlags(mPrivateFlags); 14566 output += "}"; 14567 Log.d(VIEW_LOG_TAG, output); 14568 } 14569 14570 /** 14571 * Creates a string of whitespaces used for indentation. 14572 * 14573 * @param depth the indentation level 14574 * @return a String containing (depth * 2 + 3) * 2 white spaces 14575 * 14576 * @hide 14577 */ 14578 protected static String debugIndent(int depth) { 14579 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14580 for (int i = 0; i < (depth * 2) + 3; i++) { 14581 spaces.append(' ').append(' '); 14582 } 14583 return spaces.toString(); 14584 } 14585 14586 /** 14587 * <p>Return the offset of the widget's text baseline from the widget's top 14588 * boundary. If this widget does not support baseline alignment, this 14589 * method returns -1. </p> 14590 * 14591 * @return the offset of the baseline within the widget's bounds or -1 14592 * if baseline alignment is not supported 14593 */ 14594 @ViewDebug.ExportedProperty(category = "layout") 14595 public int getBaseline() { 14596 return -1; 14597 } 14598 14599 /** 14600 * Call this when something has changed which has invalidated the 14601 * layout of this view. This will schedule a layout pass of the view 14602 * tree. 14603 */ 14604 public void requestLayout() { 14605 if (ViewDebug.TRACE_HIERARCHY) { 14606 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14607 } 14608 14609 mPrivateFlags |= FORCE_LAYOUT; 14610 mPrivateFlags |= INVALIDATED; 14611 14612 if (mLayoutParams != null) { 14613 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14614 } 14615 14616 if (mParent != null && !mParent.isLayoutRequested()) { 14617 mParent.requestLayout(); 14618 } 14619 } 14620 14621 /** 14622 * Forces this view to be laid out during the next layout pass. 14623 * This method does not call requestLayout() or forceLayout() 14624 * on the parent. 14625 */ 14626 public void forceLayout() { 14627 mPrivateFlags |= FORCE_LAYOUT; 14628 mPrivateFlags |= INVALIDATED; 14629 } 14630 14631 /** 14632 * <p> 14633 * This is called to find out how big a view should be. The parent 14634 * supplies constraint information in the width and height parameters. 14635 * </p> 14636 * 14637 * <p> 14638 * The actual measurement work of a view is performed in 14639 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14640 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14641 * </p> 14642 * 14643 * 14644 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14645 * parent 14646 * @param heightMeasureSpec Vertical space requirements as imposed by the 14647 * parent 14648 * 14649 * @see #onMeasure(int, int) 14650 */ 14651 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14652 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14653 widthMeasureSpec != mOldWidthMeasureSpec || 14654 heightMeasureSpec != mOldHeightMeasureSpec) { 14655 14656 // first clears the measured dimension flag 14657 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14658 14659 if (ViewDebug.TRACE_HIERARCHY) { 14660 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14661 } 14662 14663 // measure ourselves, this should set the measured dimension flag back 14664 onMeasure(widthMeasureSpec, heightMeasureSpec); 14665 14666 // flag not set, setMeasuredDimension() was not invoked, we raise 14667 // an exception to warn the developer 14668 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14669 throw new IllegalStateException("onMeasure() did not set the" 14670 + " measured dimension by calling" 14671 + " setMeasuredDimension()"); 14672 } 14673 14674 mPrivateFlags |= LAYOUT_REQUIRED; 14675 } 14676 14677 mOldWidthMeasureSpec = widthMeasureSpec; 14678 mOldHeightMeasureSpec = heightMeasureSpec; 14679 } 14680 14681 /** 14682 * <p> 14683 * Measure the view and its content to determine the measured width and the 14684 * measured height. This method is invoked by {@link #measure(int, int)} and 14685 * should be overriden by subclasses to provide accurate and efficient 14686 * measurement of their contents. 14687 * </p> 14688 * 14689 * <p> 14690 * <strong>CONTRACT:</strong> When overriding this method, you 14691 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14692 * measured width and height of this view. Failure to do so will trigger an 14693 * <code>IllegalStateException</code>, thrown by 14694 * {@link #measure(int, int)}. Calling the superclass' 14695 * {@link #onMeasure(int, int)} is a valid use. 14696 * </p> 14697 * 14698 * <p> 14699 * The base class implementation of measure defaults to the background size, 14700 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14701 * override {@link #onMeasure(int, int)} to provide better measurements of 14702 * their content. 14703 * </p> 14704 * 14705 * <p> 14706 * If this method is overridden, it is the subclass's responsibility to make 14707 * sure the measured height and width are at least the view's minimum height 14708 * and width ({@link #getSuggestedMinimumHeight()} and 14709 * {@link #getSuggestedMinimumWidth()}). 14710 * </p> 14711 * 14712 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 14713 * The requirements are encoded with 14714 * {@link android.view.View.MeasureSpec}. 14715 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 14716 * The requirements are encoded with 14717 * {@link android.view.View.MeasureSpec}. 14718 * 14719 * @see #getMeasuredWidth() 14720 * @see #getMeasuredHeight() 14721 * @see #setMeasuredDimension(int, int) 14722 * @see #getSuggestedMinimumHeight() 14723 * @see #getSuggestedMinimumWidth() 14724 * @see android.view.View.MeasureSpec#getMode(int) 14725 * @see android.view.View.MeasureSpec#getSize(int) 14726 */ 14727 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 14728 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 14729 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 14730 } 14731 14732 /** 14733 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 14734 * measured width and measured height. Failing to do so will trigger an 14735 * exception at measurement time.</p> 14736 * 14737 * @param measuredWidth The measured width of this view. May be a complex 14738 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14739 * {@link #MEASURED_STATE_TOO_SMALL}. 14740 * @param measuredHeight The measured height of this view. May be a complex 14741 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14742 * {@link #MEASURED_STATE_TOO_SMALL}. 14743 */ 14744 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 14745 mMeasuredWidth = measuredWidth; 14746 mMeasuredHeight = measuredHeight; 14747 14748 mPrivateFlags |= MEASURED_DIMENSION_SET; 14749 } 14750 14751 /** 14752 * Merge two states as returned by {@link #getMeasuredState()}. 14753 * @param curState The current state as returned from a view or the result 14754 * of combining multiple views. 14755 * @param newState The new view state to combine. 14756 * @return Returns a new integer reflecting the combination of the two 14757 * states. 14758 */ 14759 public static int combineMeasuredStates(int curState, int newState) { 14760 return curState | newState; 14761 } 14762 14763 /** 14764 * Version of {@link #resolveSizeAndState(int, int, int)} 14765 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 14766 */ 14767 public static int resolveSize(int size, int measureSpec) { 14768 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 14769 } 14770 14771 /** 14772 * Utility to reconcile a desired size and state, with constraints imposed 14773 * by a MeasureSpec. Will take the desired size, unless a different size 14774 * is imposed by the constraints. The returned value is a compound integer, 14775 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 14776 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 14777 * size is smaller than the size the view wants to be. 14778 * 14779 * @param size How big the view wants to be 14780 * @param measureSpec Constraints imposed by the parent 14781 * @return Size information bit mask as defined by 14782 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 14783 */ 14784 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 14785 int result = size; 14786 int specMode = MeasureSpec.getMode(measureSpec); 14787 int specSize = MeasureSpec.getSize(measureSpec); 14788 switch (specMode) { 14789 case MeasureSpec.UNSPECIFIED: 14790 result = size; 14791 break; 14792 case MeasureSpec.AT_MOST: 14793 if (specSize < size) { 14794 result = specSize | MEASURED_STATE_TOO_SMALL; 14795 } else { 14796 result = size; 14797 } 14798 break; 14799 case MeasureSpec.EXACTLY: 14800 result = specSize; 14801 break; 14802 } 14803 return result | (childMeasuredState&MEASURED_STATE_MASK); 14804 } 14805 14806 /** 14807 * Utility to return a default size. Uses the supplied size if the 14808 * MeasureSpec imposed no constraints. Will get larger if allowed 14809 * by the MeasureSpec. 14810 * 14811 * @param size Default size for this view 14812 * @param measureSpec Constraints imposed by the parent 14813 * @return The size this view should be. 14814 */ 14815 public static int getDefaultSize(int size, int measureSpec) { 14816 int result = size; 14817 int specMode = MeasureSpec.getMode(measureSpec); 14818 int specSize = MeasureSpec.getSize(measureSpec); 14819 14820 switch (specMode) { 14821 case MeasureSpec.UNSPECIFIED: 14822 result = size; 14823 break; 14824 case MeasureSpec.AT_MOST: 14825 case MeasureSpec.EXACTLY: 14826 result = specSize; 14827 break; 14828 } 14829 return result; 14830 } 14831 14832 /** 14833 * Returns the suggested minimum height that the view should use. This 14834 * returns the maximum of the view's minimum height 14835 * and the background's minimum height 14836 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 14837 * <p> 14838 * When being used in {@link #onMeasure(int, int)}, the caller should still 14839 * ensure the returned height is within the requirements of the parent. 14840 * 14841 * @return The suggested minimum height of the view. 14842 */ 14843 protected int getSuggestedMinimumHeight() { 14844 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 14845 14846 } 14847 14848 /** 14849 * Returns the suggested minimum width that the view should use. This 14850 * returns the maximum of the view's minimum width) 14851 * and the background's minimum width 14852 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 14853 * <p> 14854 * When being used in {@link #onMeasure(int, int)}, the caller should still 14855 * ensure the returned width is within the requirements of the parent. 14856 * 14857 * @return The suggested minimum width of the view. 14858 */ 14859 protected int getSuggestedMinimumWidth() { 14860 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 14861 } 14862 14863 /** 14864 * Returns the minimum height of the view. 14865 * 14866 * @return the minimum height the view will try to be. 14867 * 14868 * @see #setMinimumHeight(int) 14869 * 14870 * @attr ref android.R.styleable#View_minHeight 14871 */ 14872 public int getMinimumHeight() { 14873 return mMinHeight; 14874 } 14875 14876 /** 14877 * Sets the minimum height of the view. It is not guaranteed the view will 14878 * be able to achieve this minimum height (for example, if its parent layout 14879 * constrains it with less available height). 14880 * 14881 * @param minHeight The minimum height the view will try to be. 14882 * 14883 * @see #getMinimumHeight() 14884 * 14885 * @attr ref android.R.styleable#View_minHeight 14886 */ 14887 public void setMinimumHeight(int minHeight) { 14888 mMinHeight = minHeight; 14889 requestLayout(); 14890 } 14891 14892 /** 14893 * Returns the minimum width of the view. 14894 * 14895 * @return the minimum width the view will try to be. 14896 * 14897 * @see #setMinimumWidth(int) 14898 * 14899 * @attr ref android.R.styleable#View_minWidth 14900 */ 14901 public int getMinimumWidth() { 14902 return mMinWidth; 14903 } 14904 14905 /** 14906 * Sets the minimum width of the view. It is not guaranteed the view will 14907 * be able to achieve this minimum width (for example, if its parent layout 14908 * constrains it with less available width). 14909 * 14910 * @param minWidth The minimum width the view will try to be. 14911 * 14912 * @see #getMinimumWidth() 14913 * 14914 * @attr ref android.R.styleable#View_minWidth 14915 */ 14916 public void setMinimumWidth(int minWidth) { 14917 mMinWidth = minWidth; 14918 requestLayout(); 14919 14920 } 14921 14922 /** 14923 * Get the animation currently associated with this view. 14924 * 14925 * @return The animation that is currently playing or 14926 * scheduled to play for this view. 14927 */ 14928 public Animation getAnimation() { 14929 return mCurrentAnimation; 14930 } 14931 14932 /** 14933 * Start the specified animation now. 14934 * 14935 * @param animation the animation to start now 14936 */ 14937 public void startAnimation(Animation animation) { 14938 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 14939 setAnimation(animation); 14940 invalidateParentCaches(); 14941 invalidate(true); 14942 } 14943 14944 /** 14945 * Cancels any animations for this view. 14946 */ 14947 public void clearAnimation() { 14948 if (mCurrentAnimation != null) { 14949 mCurrentAnimation.detach(); 14950 } 14951 mCurrentAnimation = null; 14952 invalidateParentIfNeeded(); 14953 } 14954 14955 /** 14956 * Sets the next animation to play for this view. 14957 * If you want the animation to play immediately, use 14958 * startAnimation. This method provides allows fine-grained 14959 * control over the start time and invalidation, but you 14960 * must make sure that 1) the animation has a start time set, and 14961 * 2) the view will be invalidated when the animation is supposed to 14962 * start. 14963 * 14964 * @param animation The next animation, or null. 14965 */ 14966 public void setAnimation(Animation animation) { 14967 mCurrentAnimation = animation; 14968 14969 if (animation != null) { 14970 // If the screen is off assume the animation start time is now instead of 14971 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 14972 // would cause the animation to start when the screen turns back on 14973 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 14974 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 14975 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 14976 } 14977 animation.reset(); 14978 } 14979 } 14980 14981 /** 14982 * Invoked by a parent ViewGroup to notify the start of the animation 14983 * currently associated with this view. If you override this method, 14984 * always call super.onAnimationStart(); 14985 * 14986 * @see #setAnimation(android.view.animation.Animation) 14987 * @see #getAnimation() 14988 */ 14989 protected void onAnimationStart() { 14990 mPrivateFlags |= ANIMATION_STARTED; 14991 } 14992 14993 /** 14994 * Invoked by a parent ViewGroup to notify the end of the animation 14995 * currently associated with this view. If you override this method, 14996 * always call super.onAnimationEnd(); 14997 * 14998 * @see #setAnimation(android.view.animation.Animation) 14999 * @see #getAnimation() 15000 */ 15001 protected void onAnimationEnd() { 15002 mPrivateFlags &= ~ANIMATION_STARTED; 15003 } 15004 15005 /** 15006 * Invoked if there is a Transform that involves alpha. Subclass that can 15007 * draw themselves with the specified alpha should return true, and then 15008 * respect that alpha when their onDraw() is called. If this returns false 15009 * then the view may be redirected to draw into an offscreen buffer to 15010 * fulfill the request, which will look fine, but may be slower than if the 15011 * subclass handles it internally. The default implementation returns false. 15012 * 15013 * @param alpha The alpha (0..255) to apply to the view's drawing 15014 * @return true if the view can draw with the specified alpha. 15015 */ 15016 protected boolean onSetAlpha(int alpha) { 15017 return false; 15018 } 15019 15020 /** 15021 * This is used by the RootView to perform an optimization when 15022 * the view hierarchy contains one or several SurfaceView. 15023 * SurfaceView is always considered transparent, but its children are not, 15024 * therefore all View objects remove themselves from the global transparent 15025 * region (passed as a parameter to this function). 15026 * 15027 * @param region The transparent region for this ViewAncestor (window). 15028 * 15029 * @return Returns true if the effective visibility of the view at this 15030 * point is opaque, regardless of the transparent region; returns false 15031 * if it is possible for underlying windows to be seen behind the view. 15032 * 15033 * {@hide} 15034 */ 15035 public boolean gatherTransparentRegion(Region region) { 15036 final AttachInfo attachInfo = mAttachInfo; 15037 if (region != null && attachInfo != null) { 15038 final int pflags = mPrivateFlags; 15039 if ((pflags & SKIP_DRAW) == 0) { 15040 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15041 // remove it from the transparent region. 15042 final int[] location = attachInfo.mTransparentLocation; 15043 getLocationInWindow(location); 15044 region.op(location[0], location[1], location[0] + mRight - mLeft, 15045 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15046 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15047 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15048 // exists, so we remove the background drawable's non-transparent 15049 // parts from this transparent region. 15050 applyDrawableToTransparentRegion(mBackground, region); 15051 } 15052 } 15053 return true; 15054 } 15055 15056 /** 15057 * Play a sound effect for this view. 15058 * 15059 * <p>The framework will play sound effects for some built in actions, such as 15060 * clicking, but you may wish to play these effects in your widget, 15061 * for instance, for internal navigation. 15062 * 15063 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15064 * {@link #isSoundEffectsEnabled()} is true. 15065 * 15066 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15067 */ 15068 public void playSoundEffect(int soundConstant) { 15069 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15070 return; 15071 } 15072 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15073 } 15074 15075 /** 15076 * BZZZTT!!1! 15077 * 15078 * <p>Provide haptic feedback to the user for this view. 15079 * 15080 * <p>The framework will provide haptic feedback for some built in actions, 15081 * such as long presses, but you may wish to provide feedback for your 15082 * own widget. 15083 * 15084 * <p>The feedback will only be performed if 15085 * {@link #isHapticFeedbackEnabled()} is true. 15086 * 15087 * @param feedbackConstant One of the constants defined in 15088 * {@link HapticFeedbackConstants} 15089 */ 15090 public boolean performHapticFeedback(int feedbackConstant) { 15091 return performHapticFeedback(feedbackConstant, 0); 15092 } 15093 15094 /** 15095 * BZZZTT!!1! 15096 * 15097 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15098 * 15099 * @param feedbackConstant One of the constants defined in 15100 * {@link HapticFeedbackConstants} 15101 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15102 */ 15103 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15104 if (mAttachInfo == null) { 15105 return false; 15106 } 15107 //noinspection SimplifiableIfStatement 15108 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15109 && !isHapticFeedbackEnabled()) { 15110 return false; 15111 } 15112 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15113 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15114 } 15115 15116 /** 15117 * Request that the visibility of the status bar or other screen/window 15118 * decorations be changed. 15119 * 15120 * <p>This method is used to put the over device UI into temporary modes 15121 * where the user's attention is focused more on the application content, 15122 * by dimming or hiding surrounding system affordances. This is typically 15123 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15124 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15125 * to be placed behind the action bar (and with these flags other system 15126 * affordances) so that smooth transitions between hiding and showing them 15127 * can be done. 15128 * 15129 * <p>Two representative examples of the use of system UI visibility is 15130 * implementing a content browsing application (like a magazine reader) 15131 * and a video playing application. 15132 * 15133 * <p>The first code shows a typical implementation of a View in a content 15134 * browsing application. In this implementation, the application goes 15135 * into a content-oriented mode by hiding the status bar and action bar, 15136 * and putting the navigation elements into lights out mode. The user can 15137 * then interact with content while in this mode. Such an application should 15138 * provide an easy way for the user to toggle out of the mode (such as to 15139 * check information in the status bar or access notifications). In the 15140 * implementation here, this is done simply by tapping on the content. 15141 * 15142 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15143 * content} 15144 * 15145 * <p>This second code sample shows a typical implementation of a View 15146 * in a video playing application. In this situation, while the video is 15147 * playing the application would like to go into a complete full-screen mode, 15148 * to use as much of the display as possible for the video. When in this state 15149 * the user can not interact with the application; the system intercepts 15150 * touching on the screen to pop the UI out of full screen mode. 15151 * 15152 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15153 * content} 15154 * 15155 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15156 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15157 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15158 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15159 */ 15160 public void setSystemUiVisibility(int visibility) { 15161 if (visibility != mSystemUiVisibility) { 15162 mSystemUiVisibility = visibility; 15163 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15164 mParent.recomputeViewAttributes(this); 15165 } 15166 } 15167 } 15168 15169 /** 15170 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15171 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15172 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15173 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15174 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15175 */ 15176 public int getSystemUiVisibility() { 15177 return mSystemUiVisibility; 15178 } 15179 15180 /** 15181 * Returns the current system UI visibility that is currently set for 15182 * the entire window. This is the combination of the 15183 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15184 * views in the window. 15185 */ 15186 public int getWindowSystemUiVisibility() { 15187 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15188 } 15189 15190 /** 15191 * Override to find out when the window's requested system UI visibility 15192 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15193 * This is different from the callbacks recieved through 15194 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15195 * in that this is only telling you about the local request of the window, 15196 * not the actual values applied by the system. 15197 */ 15198 public void onWindowSystemUiVisibilityChanged(int visible) { 15199 } 15200 15201 /** 15202 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15203 * the view hierarchy. 15204 */ 15205 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15206 onWindowSystemUiVisibilityChanged(visible); 15207 } 15208 15209 /** 15210 * Set a listener to receive callbacks when the visibility of the system bar changes. 15211 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15212 */ 15213 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15214 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15215 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15216 mParent.recomputeViewAttributes(this); 15217 } 15218 } 15219 15220 /** 15221 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15222 * the view hierarchy. 15223 */ 15224 public void dispatchSystemUiVisibilityChanged(int visibility) { 15225 ListenerInfo li = mListenerInfo; 15226 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15227 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15228 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15229 } 15230 } 15231 15232 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 15233 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15234 if (val != mSystemUiVisibility) { 15235 setSystemUiVisibility(val); 15236 } 15237 } 15238 15239 /** @hide */ 15240 public void setDisabledSystemUiVisibility(int flags) { 15241 if (mAttachInfo != null) { 15242 if (mAttachInfo.mDisabledSystemUiVisibility != flags) { 15243 mAttachInfo.mDisabledSystemUiVisibility = flags; 15244 if (mParent != null) { 15245 mParent.recomputeViewAttributes(this); 15246 } 15247 } 15248 } 15249 } 15250 15251 /** 15252 * Creates an image that the system displays during the drag and drop 15253 * operation. This is called a "drag shadow". The default implementation 15254 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15255 * appearance as the given View. The default also positions the center of the drag shadow 15256 * directly under the touch point. If no View is provided (the constructor with no parameters 15257 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15258 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15259 * default is an invisible drag shadow. 15260 * <p> 15261 * You are not required to use the View you provide to the constructor as the basis of the 15262 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15263 * anything you want as the drag shadow. 15264 * </p> 15265 * <p> 15266 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15267 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15268 * size and position of the drag shadow. It uses this data to construct a 15269 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15270 * so that your application can draw the shadow image in the Canvas. 15271 * </p> 15272 * 15273 * <div class="special reference"> 15274 * <h3>Developer Guides</h3> 15275 * <p>For a guide to implementing drag and drop features, read the 15276 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15277 * </div> 15278 */ 15279 public static class DragShadowBuilder { 15280 private final WeakReference<View> mView; 15281 15282 /** 15283 * Constructs a shadow image builder based on a View. By default, the resulting drag 15284 * shadow will have the same appearance and dimensions as the View, with the touch point 15285 * over the center of the View. 15286 * @param view A View. Any View in scope can be used. 15287 */ 15288 public DragShadowBuilder(View view) { 15289 mView = new WeakReference<View>(view); 15290 } 15291 15292 /** 15293 * Construct a shadow builder object with no associated View. This 15294 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15295 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15296 * to supply the drag shadow's dimensions and appearance without 15297 * reference to any View object. If they are not overridden, then the result is an 15298 * invisible drag shadow. 15299 */ 15300 public DragShadowBuilder() { 15301 mView = new WeakReference<View>(null); 15302 } 15303 15304 /** 15305 * Returns the View object that had been passed to the 15306 * {@link #View.DragShadowBuilder(View)} 15307 * constructor. If that View parameter was {@code null} or if the 15308 * {@link #View.DragShadowBuilder()} 15309 * constructor was used to instantiate the builder object, this method will return 15310 * null. 15311 * 15312 * @return The View object associate with this builder object. 15313 */ 15314 @SuppressWarnings({"JavadocReference"}) 15315 final public View getView() { 15316 return mView.get(); 15317 } 15318 15319 /** 15320 * Provides the metrics for the shadow image. These include the dimensions of 15321 * the shadow image, and the point within that shadow that should 15322 * be centered under the touch location while dragging. 15323 * <p> 15324 * The default implementation sets the dimensions of the shadow to be the 15325 * same as the dimensions of the View itself and centers the shadow under 15326 * the touch point. 15327 * </p> 15328 * 15329 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15330 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15331 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15332 * image. 15333 * 15334 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15335 * shadow image that should be underneath the touch point during the drag and drop 15336 * operation. Your application must set {@link android.graphics.Point#x} to the 15337 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15338 */ 15339 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15340 final View view = mView.get(); 15341 if (view != null) { 15342 shadowSize.set(view.getWidth(), view.getHeight()); 15343 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15344 } else { 15345 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15346 } 15347 } 15348 15349 /** 15350 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15351 * based on the dimensions it received from the 15352 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15353 * 15354 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15355 */ 15356 public void onDrawShadow(Canvas canvas) { 15357 final View view = mView.get(); 15358 if (view != null) { 15359 view.draw(canvas); 15360 } else { 15361 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15362 } 15363 } 15364 } 15365 15366 /** 15367 * Starts a drag and drop operation. When your application calls this method, it passes a 15368 * {@link android.view.View.DragShadowBuilder} object to the system. The 15369 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15370 * to get metrics for the drag shadow, and then calls the object's 15371 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15372 * <p> 15373 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15374 * drag events to all the View objects in your application that are currently visible. It does 15375 * this either by calling the View object's drag listener (an implementation of 15376 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15377 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15378 * Both are passed a {@link android.view.DragEvent} object that has a 15379 * {@link android.view.DragEvent#getAction()} value of 15380 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15381 * </p> 15382 * <p> 15383 * Your application can invoke startDrag() on any attached View object. The View object does not 15384 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15385 * be related to the View the user selected for dragging. 15386 * </p> 15387 * @param data A {@link android.content.ClipData} object pointing to the data to be 15388 * transferred by the drag and drop operation. 15389 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15390 * drag shadow. 15391 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15392 * drop operation. This Object is put into every DragEvent object sent by the system during the 15393 * current drag. 15394 * <p> 15395 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15396 * to the target Views. For example, it can contain flags that differentiate between a 15397 * a copy operation and a move operation. 15398 * </p> 15399 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15400 * so the parameter should be set to 0. 15401 * @return {@code true} if the method completes successfully, or 15402 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15403 * do a drag, and so no drag operation is in progress. 15404 */ 15405 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15406 Object myLocalState, int flags) { 15407 if (ViewDebug.DEBUG_DRAG) { 15408 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15409 } 15410 boolean okay = false; 15411 15412 Point shadowSize = new Point(); 15413 Point shadowTouchPoint = new Point(); 15414 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15415 15416 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15417 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15418 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15419 } 15420 15421 if (ViewDebug.DEBUG_DRAG) { 15422 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15423 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15424 } 15425 Surface surface = new Surface(); 15426 try { 15427 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15428 flags, shadowSize.x, shadowSize.y, surface); 15429 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15430 + " surface=" + surface); 15431 if (token != null) { 15432 Canvas canvas = surface.lockCanvas(null); 15433 try { 15434 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15435 shadowBuilder.onDrawShadow(canvas); 15436 } finally { 15437 surface.unlockCanvasAndPost(canvas); 15438 } 15439 15440 final ViewRootImpl root = getViewRootImpl(); 15441 15442 // Cache the local state object for delivery with DragEvents 15443 root.setLocalDragState(myLocalState); 15444 15445 // repurpose 'shadowSize' for the last touch point 15446 root.getLastTouchPoint(shadowSize); 15447 15448 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15449 shadowSize.x, shadowSize.y, 15450 shadowTouchPoint.x, shadowTouchPoint.y, data); 15451 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15452 15453 // Off and running! Release our local surface instance; the drag 15454 // shadow surface is now managed by the system process. 15455 surface.release(); 15456 } 15457 } catch (Exception e) { 15458 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15459 surface.destroy(); 15460 } 15461 15462 return okay; 15463 } 15464 15465 /** 15466 * Handles drag events sent by the system following a call to 15467 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15468 *<p> 15469 * When the system calls this method, it passes a 15470 * {@link android.view.DragEvent} object. A call to 15471 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15472 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15473 * operation. 15474 * @param event The {@link android.view.DragEvent} sent by the system. 15475 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15476 * in DragEvent, indicating the type of drag event represented by this object. 15477 * @return {@code true} if the method was successful, otherwise {@code false}. 15478 * <p> 15479 * The method should return {@code true} in response to an action type of 15480 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15481 * operation. 15482 * </p> 15483 * <p> 15484 * The method should also return {@code true} in response to an action type of 15485 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15486 * {@code false} if it didn't. 15487 * </p> 15488 */ 15489 public boolean onDragEvent(DragEvent event) { 15490 return false; 15491 } 15492 15493 /** 15494 * Detects if this View is enabled and has a drag event listener. 15495 * If both are true, then it calls the drag event listener with the 15496 * {@link android.view.DragEvent} it received. If the drag event listener returns 15497 * {@code true}, then dispatchDragEvent() returns {@code true}. 15498 * <p> 15499 * For all other cases, the method calls the 15500 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15501 * method and returns its result. 15502 * </p> 15503 * <p> 15504 * This ensures that a drag event is always consumed, even if the View does not have a drag 15505 * event listener. However, if the View has a listener and the listener returns true, then 15506 * onDragEvent() is not called. 15507 * </p> 15508 */ 15509 public boolean dispatchDragEvent(DragEvent event) { 15510 //noinspection SimplifiableIfStatement 15511 ListenerInfo li = mListenerInfo; 15512 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15513 && li.mOnDragListener.onDrag(this, event)) { 15514 return true; 15515 } 15516 return onDragEvent(event); 15517 } 15518 15519 boolean canAcceptDrag() { 15520 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15521 } 15522 15523 /** 15524 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15525 * it is ever exposed at all. 15526 * @hide 15527 */ 15528 public void onCloseSystemDialogs(String reason) { 15529 } 15530 15531 /** 15532 * Given a Drawable whose bounds have been set to draw into this view, 15533 * update a Region being computed for 15534 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15535 * that any non-transparent parts of the Drawable are removed from the 15536 * given transparent region. 15537 * 15538 * @param dr The Drawable whose transparency is to be applied to the region. 15539 * @param region A Region holding the current transparency information, 15540 * where any parts of the region that are set are considered to be 15541 * transparent. On return, this region will be modified to have the 15542 * transparency information reduced by the corresponding parts of the 15543 * Drawable that are not transparent. 15544 * {@hide} 15545 */ 15546 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15547 if (DBG) { 15548 Log.i("View", "Getting transparent region for: " + this); 15549 } 15550 final Region r = dr.getTransparentRegion(); 15551 final Rect db = dr.getBounds(); 15552 final AttachInfo attachInfo = mAttachInfo; 15553 if (r != null && attachInfo != null) { 15554 final int w = getRight()-getLeft(); 15555 final int h = getBottom()-getTop(); 15556 if (db.left > 0) { 15557 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15558 r.op(0, 0, db.left, h, Region.Op.UNION); 15559 } 15560 if (db.right < w) { 15561 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15562 r.op(db.right, 0, w, h, Region.Op.UNION); 15563 } 15564 if (db.top > 0) { 15565 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15566 r.op(0, 0, w, db.top, Region.Op.UNION); 15567 } 15568 if (db.bottom < h) { 15569 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15570 r.op(0, db.bottom, w, h, Region.Op.UNION); 15571 } 15572 final int[] location = attachInfo.mTransparentLocation; 15573 getLocationInWindow(location); 15574 r.translate(location[0], location[1]); 15575 region.op(r, Region.Op.INTERSECT); 15576 } else { 15577 region.op(db, Region.Op.DIFFERENCE); 15578 } 15579 } 15580 15581 private void checkForLongClick(int delayOffset) { 15582 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15583 mHasPerformedLongPress = false; 15584 15585 if (mPendingCheckForLongPress == null) { 15586 mPendingCheckForLongPress = new CheckForLongPress(); 15587 } 15588 mPendingCheckForLongPress.rememberWindowAttachCount(); 15589 postDelayed(mPendingCheckForLongPress, 15590 ViewConfiguration.getLongPressTimeout() - delayOffset); 15591 } 15592 } 15593 15594 /** 15595 * Inflate a view from an XML resource. This convenience method wraps the {@link 15596 * LayoutInflater} class, which provides a full range of options for view inflation. 15597 * 15598 * @param context The Context object for your activity or application. 15599 * @param resource The resource ID to inflate 15600 * @param root A view group that will be the parent. Used to properly inflate the 15601 * layout_* parameters. 15602 * @see LayoutInflater 15603 */ 15604 public static View inflate(Context context, int resource, ViewGroup root) { 15605 LayoutInflater factory = LayoutInflater.from(context); 15606 return factory.inflate(resource, root); 15607 } 15608 15609 /** 15610 * Scroll the view with standard behavior for scrolling beyond the normal 15611 * content boundaries. Views that call this method should override 15612 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15613 * results of an over-scroll operation. 15614 * 15615 * Views can use this method to handle any touch or fling-based scrolling. 15616 * 15617 * @param deltaX Change in X in pixels 15618 * @param deltaY Change in Y in pixels 15619 * @param scrollX Current X scroll value in pixels before applying deltaX 15620 * @param scrollY Current Y scroll value in pixels before applying deltaY 15621 * @param scrollRangeX Maximum content scroll range along the X axis 15622 * @param scrollRangeY Maximum content scroll range along the Y axis 15623 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15624 * along the X axis. 15625 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15626 * along the Y axis. 15627 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15628 * @return true if scrolling was clamped to an over-scroll boundary along either 15629 * axis, false otherwise. 15630 */ 15631 @SuppressWarnings({"UnusedParameters"}) 15632 protected boolean overScrollBy(int deltaX, int deltaY, 15633 int scrollX, int scrollY, 15634 int scrollRangeX, int scrollRangeY, 15635 int maxOverScrollX, int maxOverScrollY, 15636 boolean isTouchEvent) { 15637 final int overScrollMode = mOverScrollMode; 15638 final boolean canScrollHorizontal = 15639 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15640 final boolean canScrollVertical = 15641 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15642 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15643 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15644 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15645 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15646 15647 int newScrollX = scrollX + deltaX; 15648 if (!overScrollHorizontal) { 15649 maxOverScrollX = 0; 15650 } 15651 15652 int newScrollY = scrollY + deltaY; 15653 if (!overScrollVertical) { 15654 maxOverScrollY = 0; 15655 } 15656 15657 // Clamp values if at the limits and record 15658 final int left = -maxOverScrollX; 15659 final int right = maxOverScrollX + scrollRangeX; 15660 final int top = -maxOverScrollY; 15661 final int bottom = maxOverScrollY + scrollRangeY; 15662 15663 boolean clampedX = false; 15664 if (newScrollX > right) { 15665 newScrollX = right; 15666 clampedX = true; 15667 } else if (newScrollX < left) { 15668 newScrollX = left; 15669 clampedX = true; 15670 } 15671 15672 boolean clampedY = false; 15673 if (newScrollY > bottom) { 15674 newScrollY = bottom; 15675 clampedY = true; 15676 } else if (newScrollY < top) { 15677 newScrollY = top; 15678 clampedY = true; 15679 } 15680 15681 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15682 15683 return clampedX || clampedY; 15684 } 15685 15686 /** 15687 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15688 * respond to the results of an over-scroll operation. 15689 * 15690 * @param scrollX New X scroll value in pixels 15691 * @param scrollY New Y scroll value in pixels 15692 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15693 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15694 */ 15695 protected void onOverScrolled(int scrollX, int scrollY, 15696 boolean clampedX, boolean clampedY) { 15697 // Intentionally empty. 15698 } 15699 15700 /** 15701 * Returns the over-scroll mode for this view. The result will be 15702 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15703 * (allow over-scrolling only if the view content is larger than the container), 15704 * or {@link #OVER_SCROLL_NEVER}. 15705 * 15706 * @return This view's over-scroll mode. 15707 */ 15708 public int getOverScrollMode() { 15709 return mOverScrollMode; 15710 } 15711 15712 /** 15713 * Set the over-scroll mode for this view. Valid over-scroll modes are 15714 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15715 * (allow over-scrolling only if the view content is larger than the container), 15716 * or {@link #OVER_SCROLL_NEVER}. 15717 * 15718 * Setting the over-scroll mode of a view will have an effect only if the 15719 * view is capable of scrolling. 15720 * 15721 * @param overScrollMode The new over-scroll mode for this view. 15722 */ 15723 public void setOverScrollMode(int overScrollMode) { 15724 if (overScrollMode != OVER_SCROLL_ALWAYS && 15725 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 15726 overScrollMode != OVER_SCROLL_NEVER) { 15727 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 15728 } 15729 mOverScrollMode = overScrollMode; 15730 } 15731 15732 /** 15733 * Gets a scale factor that determines the distance the view should scroll 15734 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 15735 * @return The vertical scroll scale factor. 15736 * @hide 15737 */ 15738 protected float getVerticalScrollFactor() { 15739 if (mVerticalScrollFactor == 0) { 15740 TypedValue outValue = new TypedValue(); 15741 if (!mContext.getTheme().resolveAttribute( 15742 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 15743 throw new IllegalStateException( 15744 "Expected theme to define listPreferredItemHeight."); 15745 } 15746 mVerticalScrollFactor = outValue.getDimension( 15747 mContext.getResources().getDisplayMetrics()); 15748 } 15749 return mVerticalScrollFactor; 15750 } 15751 15752 /** 15753 * Gets a scale factor that determines the distance the view should scroll 15754 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 15755 * @return The horizontal scroll scale factor. 15756 * @hide 15757 */ 15758 protected float getHorizontalScrollFactor() { 15759 // TODO: Should use something else. 15760 return getVerticalScrollFactor(); 15761 } 15762 15763 /** 15764 * Return the value specifying the text direction or policy that was set with 15765 * {@link #setTextDirection(int)}. 15766 * 15767 * @return the defined text direction. It can be one of: 15768 * 15769 * {@link #TEXT_DIRECTION_INHERIT}, 15770 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15771 * {@link #TEXT_DIRECTION_ANY_RTL}, 15772 * {@link #TEXT_DIRECTION_LTR}, 15773 * {@link #TEXT_DIRECTION_RTL}, 15774 * {@link #TEXT_DIRECTION_LOCALE} 15775 * @hide 15776 */ 15777 @ViewDebug.ExportedProperty(category = "text", mapping = { 15778 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 15779 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 15780 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 15781 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 15782 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 15783 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 15784 }) 15785 public int getTextDirection() { 15786 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 15787 } 15788 15789 /** 15790 * Set the text direction. 15791 * 15792 * @param textDirection the direction to set. Should be one of: 15793 * 15794 * {@link #TEXT_DIRECTION_INHERIT}, 15795 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15796 * {@link #TEXT_DIRECTION_ANY_RTL}, 15797 * {@link #TEXT_DIRECTION_LTR}, 15798 * {@link #TEXT_DIRECTION_RTL}, 15799 * {@link #TEXT_DIRECTION_LOCALE} 15800 * @hide 15801 */ 15802 public void setTextDirection(int textDirection) { 15803 if (getTextDirection() != textDirection) { 15804 // Reset the current text direction and the resolved one 15805 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 15806 resetResolvedTextDirection(); 15807 // Set the new text direction 15808 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 15809 // Refresh 15810 requestLayout(); 15811 invalidate(true); 15812 } 15813 } 15814 15815 /** 15816 * Return the resolved text direction. 15817 * 15818 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 15819 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 15820 * up the parent chain of the view. if there is no parent, then it will return the default 15821 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 15822 * 15823 * @return the resolved text direction. Returns one of: 15824 * 15825 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15826 * {@link #TEXT_DIRECTION_ANY_RTL}, 15827 * {@link #TEXT_DIRECTION_LTR}, 15828 * {@link #TEXT_DIRECTION_RTL}, 15829 * {@link #TEXT_DIRECTION_LOCALE} 15830 * @hide 15831 */ 15832 public int getResolvedTextDirection() { 15833 // The text direction will be resolved only if needed 15834 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 15835 resolveTextDirection(); 15836 } 15837 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 15838 } 15839 15840 /** 15841 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 15842 * resolution is done. 15843 * @hide 15844 */ 15845 public void resolveTextDirection() { 15846 // Reset any previous text direction resolution 15847 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 15848 15849 if (hasRtlSupport()) { 15850 // Set resolved text direction flag depending on text direction flag 15851 final int textDirection = getTextDirection(); 15852 switch(textDirection) { 15853 case TEXT_DIRECTION_INHERIT: 15854 if (canResolveTextDirection()) { 15855 ViewGroup viewGroup = ((ViewGroup) mParent); 15856 15857 // Set current resolved direction to the same value as the parent's one 15858 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 15859 switch (parentResolvedDirection) { 15860 case TEXT_DIRECTION_FIRST_STRONG: 15861 case TEXT_DIRECTION_ANY_RTL: 15862 case TEXT_DIRECTION_LTR: 15863 case TEXT_DIRECTION_RTL: 15864 case TEXT_DIRECTION_LOCALE: 15865 mPrivateFlags2 |= 15866 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 15867 break; 15868 default: 15869 // Default resolved direction is "first strong" heuristic 15870 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15871 } 15872 } else { 15873 // We cannot do the resolution if there is no parent, so use the default one 15874 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15875 } 15876 break; 15877 case TEXT_DIRECTION_FIRST_STRONG: 15878 case TEXT_DIRECTION_ANY_RTL: 15879 case TEXT_DIRECTION_LTR: 15880 case TEXT_DIRECTION_RTL: 15881 case TEXT_DIRECTION_LOCALE: 15882 // Resolved direction is the same as text direction 15883 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 15884 break; 15885 default: 15886 // Default resolved direction is "first strong" heuristic 15887 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15888 } 15889 } else { 15890 // Default resolved direction is "first strong" heuristic 15891 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15892 } 15893 15894 // Set to resolved 15895 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 15896 onResolvedTextDirectionChanged(); 15897 } 15898 15899 /** 15900 * Called when text direction has been resolved. Subclasses that care about text direction 15901 * resolution should override this method. 15902 * 15903 * The default implementation does nothing. 15904 * @hide 15905 */ 15906 public void onResolvedTextDirectionChanged() { 15907 } 15908 15909 /** 15910 * Check if text direction resolution can be done. 15911 * 15912 * @return true if text direction resolution can be done otherwise return false. 15913 * @hide 15914 */ 15915 public boolean canResolveTextDirection() { 15916 switch (getTextDirection()) { 15917 case TEXT_DIRECTION_INHERIT: 15918 return (mParent != null) && (mParent instanceof ViewGroup); 15919 default: 15920 return true; 15921 } 15922 } 15923 15924 /** 15925 * Reset resolved text direction. Text direction can be resolved with a call to 15926 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 15927 * reset is done. 15928 * @hide 15929 */ 15930 public void resetResolvedTextDirection() { 15931 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 15932 onResolvedTextDirectionReset(); 15933 } 15934 15935 /** 15936 * Called when text direction is reset. Subclasses that care about text direction reset should 15937 * override this method and do a reset of the text direction of their children. The default 15938 * implementation does nothing. 15939 * @hide 15940 */ 15941 public void onResolvedTextDirectionReset() { 15942 } 15943 15944 /** 15945 * Return the value specifying the text alignment or policy that was set with 15946 * {@link #setTextAlignment(int)}. 15947 * 15948 * @return the defined text alignment. It can be one of: 15949 * 15950 * {@link #TEXT_ALIGNMENT_INHERIT}, 15951 * {@link #TEXT_ALIGNMENT_GRAVITY}, 15952 * {@link #TEXT_ALIGNMENT_CENTER}, 15953 * {@link #TEXT_ALIGNMENT_TEXT_START}, 15954 * {@link #TEXT_ALIGNMENT_TEXT_END}, 15955 * {@link #TEXT_ALIGNMENT_VIEW_START}, 15956 * {@link #TEXT_ALIGNMENT_VIEW_END} 15957 * @hide 15958 */ 15959 @ViewDebug.ExportedProperty(category = "text", mapping = { 15960 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 15961 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 15962 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 15963 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 15964 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 15965 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 15966 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 15967 }) 15968 public int getTextAlignment() { 15969 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 15970 } 15971 15972 /** 15973 * Set the text alignment. 15974 * 15975 * @param textAlignment The text alignment to set. Should be one of 15976 * 15977 * {@link #TEXT_ALIGNMENT_INHERIT}, 15978 * {@link #TEXT_ALIGNMENT_GRAVITY}, 15979 * {@link #TEXT_ALIGNMENT_CENTER}, 15980 * {@link #TEXT_ALIGNMENT_TEXT_START}, 15981 * {@link #TEXT_ALIGNMENT_TEXT_END}, 15982 * {@link #TEXT_ALIGNMENT_VIEW_START}, 15983 * {@link #TEXT_ALIGNMENT_VIEW_END} 15984 * 15985 * @attr ref android.R.styleable#View_textAlignment 15986 * @hide 15987 */ 15988 public void setTextAlignment(int textAlignment) { 15989 if (textAlignment != getTextAlignment()) { 15990 // Reset the current and resolved text alignment 15991 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 15992 resetResolvedTextAlignment(); 15993 // Set the new text alignment 15994 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 15995 // Refresh 15996 requestLayout(); 15997 invalidate(true); 15998 } 15999 } 16000 16001 /** 16002 * Return the resolved text alignment. 16003 * 16004 * The resolved text alignment. This needs resolution if the value is 16005 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 16006 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 16007 * 16008 * @return the resolved text alignment. Returns one of: 16009 * 16010 * {@link #TEXT_ALIGNMENT_GRAVITY}, 16011 * {@link #TEXT_ALIGNMENT_CENTER}, 16012 * {@link #TEXT_ALIGNMENT_TEXT_START}, 16013 * {@link #TEXT_ALIGNMENT_TEXT_END}, 16014 * {@link #TEXT_ALIGNMENT_VIEW_START}, 16015 * {@link #TEXT_ALIGNMENT_VIEW_END} 16016 * @hide 16017 */ 16018 @ViewDebug.ExportedProperty(category = "text", mapping = { 16019 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 16020 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 16021 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 16022 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 16023 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 16024 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 16025 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 16026 }) 16027 public int getResolvedTextAlignment() { 16028 // If text alignment is not resolved, then resolve it 16029 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 16030 resolveTextAlignment(); 16031 } 16032 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 16033 } 16034 16035 /** 16036 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 16037 * resolution is done. 16038 * @hide 16039 */ 16040 public void resolveTextAlignment() { 16041 // Reset any previous text alignment resolution 16042 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16043 16044 if (hasRtlSupport()) { 16045 // Set resolved text alignment flag depending on text alignment flag 16046 final int textAlignment = getTextAlignment(); 16047 switch (textAlignment) { 16048 case TEXT_ALIGNMENT_INHERIT: 16049 // Check if we can resolve the text alignment 16050 if (canResolveLayoutDirection() && mParent instanceof View) { 16051 View view = (View) mParent; 16052 16053 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16054 switch (parentResolvedTextAlignment) { 16055 case TEXT_ALIGNMENT_GRAVITY: 16056 case TEXT_ALIGNMENT_TEXT_START: 16057 case TEXT_ALIGNMENT_TEXT_END: 16058 case TEXT_ALIGNMENT_CENTER: 16059 case TEXT_ALIGNMENT_VIEW_START: 16060 case TEXT_ALIGNMENT_VIEW_END: 16061 // Resolved text alignment is the same as the parent resolved 16062 // text alignment 16063 mPrivateFlags2 |= 16064 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16065 break; 16066 default: 16067 // Use default resolved text alignment 16068 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16069 } 16070 } 16071 else { 16072 // We cannot do the resolution if there is no parent so use the default 16073 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16074 } 16075 break; 16076 case TEXT_ALIGNMENT_GRAVITY: 16077 case TEXT_ALIGNMENT_TEXT_START: 16078 case TEXT_ALIGNMENT_TEXT_END: 16079 case TEXT_ALIGNMENT_CENTER: 16080 case TEXT_ALIGNMENT_VIEW_START: 16081 case TEXT_ALIGNMENT_VIEW_END: 16082 // Resolved text alignment is the same as text alignment 16083 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16084 break; 16085 default: 16086 // Use default resolved text alignment 16087 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16088 } 16089 } else { 16090 // Use default resolved text alignment 16091 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16092 } 16093 16094 // Set the resolved 16095 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16096 onResolvedTextAlignmentChanged(); 16097 } 16098 16099 /** 16100 * Check if text alignment resolution can be done. 16101 * 16102 * @return true if text alignment resolution can be done otherwise return false. 16103 * @hide 16104 */ 16105 public boolean canResolveTextAlignment() { 16106 switch (getTextAlignment()) { 16107 case TEXT_DIRECTION_INHERIT: 16108 return (mParent != null); 16109 default: 16110 return true; 16111 } 16112 } 16113 16114 /** 16115 * Called when text alignment has been resolved. Subclasses that care about text alignment 16116 * resolution should override this method. 16117 * 16118 * The default implementation does nothing. 16119 * @hide 16120 */ 16121 public void onResolvedTextAlignmentChanged() { 16122 } 16123 16124 /** 16125 * Reset resolved text alignment. Text alignment can be resolved with a call to 16126 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16127 * reset is done. 16128 * @hide 16129 */ 16130 public void resetResolvedTextAlignment() { 16131 // Reset any previous text alignment resolution 16132 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16133 onResolvedTextAlignmentReset(); 16134 } 16135 16136 /** 16137 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16138 * override this method and do a reset of the text alignment of their children. The default 16139 * implementation does nothing. 16140 * @hide 16141 */ 16142 public void onResolvedTextAlignmentReset() { 16143 } 16144 16145 // 16146 // Properties 16147 // 16148 /** 16149 * A Property wrapper around the <code>alpha</code> functionality handled by the 16150 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16151 */ 16152 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16153 @Override 16154 public void setValue(View object, float value) { 16155 object.setAlpha(value); 16156 } 16157 16158 @Override 16159 public Float get(View object) { 16160 return object.getAlpha(); 16161 } 16162 }; 16163 16164 /** 16165 * A Property wrapper around the <code>translationX</code> functionality handled by the 16166 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16167 */ 16168 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16169 @Override 16170 public void setValue(View object, float value) { 16171 object.setTranslationX(value); 16172 } 16173 16174 @Override 16175 public Float get(View object) { 16176 return object.getTranslationX(); 16177 } 16178 }; 16179 16180 /** 16181 * A Property wrapper around the <code>translationY</code> functionality handled by the 16182 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16183 */ 16184 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16185 @Override 16186 public void setValue(View object, float value) { 16187 object.setTranslationY(value); 16188 } 16189 16190 @Override 16191 public Float get(View object) { 16192 return object.getTranslationY(); 16193 } 16194 }; 16195 16196 /** 16197 * A Property wrapper around the <code>x</code> functionality handled by the 16198 * {@link View#setX(float)} and {@link View#getX()} methods. 16199 */ 16200 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16201 @Override 16202 public void setValue(View object, float value) { 16203 object.setX(value); 16204 } 16205 16206 @Override 16207 public Float get(View object) { 16208 return object.getX(); 16209 } 16210 }; 16211 16212 /** 16213 * A Property wrapper around the <code>y</code> functionality handled by the 16214 * {@link View#setY(float)} and {@link View#getY()} methods. 16215 */ 16216 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16217 @Override 16218 public void setValue(View object, float value) { 16219 object.setY(value); 16220 } 16221 16222 @Override 16223 public Float get(View object) { 16224 return object.getY(); 16225 } 16226 }; 16227 16228 /** 16229 * A Property wrapper around the <code>rotation</code> functionality handled by the 16230 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16231 */ 16232 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16233 @Override 16234 public void setValue(View object, float value) { 16235 object.setRotation(value); 16236 } 16237 16238 @Override 16239 public Float get(View object) { 16240 return object.getRotation(); 16241 } 16242 }; 16243 16244 /** 16245 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16246 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16247 */ 16248 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16249 @Override 16250 public void setValue(View object, float value) { 16251 object.setRotationX(value); 16252 } 16253 16254 @Override 16255 public Float get(View object) { 16256 return object.getRotationX(); 16257 } 16258 }; 16259 16260 /** 16261 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16262 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16263 */ 16264 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16265 @Override 16266 public void setValue(View object, float value) { 16267 object.setRotationY(value); 16268 } 16269 16270 @Override 16271 public Float get(View object) { 16272 return object.getRotationY(); 16273 } 16274 }; 16275 16276 /** 16277 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16278 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16279 */ 16280 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16281 @Override 16282 public void setValue(View object, float value) { 16283 object.setScaleX(value); 16284 } 16285 16286 @Override 16287 public Float get(View object) { 16288 return object.getScaleX(); 16289 } 16290 }; 16291 16292 /** 16293 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16294 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16295 */ 16296 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16297 @Override 16298 public void setValue(View object, float value) { 16299 object.setScaleY(value); 16300 } 16301 16302 @Override 16303 public Float get(View object) { 16304 return object.getScaleY(); 16305 } 16306 }; 16307 16308 /** 16309 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16310 * Each MeasureSpec represents a requirement for either the width or the height. 16311 * A MeasureSpec is comprised of a size and a mode. There are three possible 16312 * modes: 16313 * <dl> 16314 * <dt>UNSPECIFIED</dt> 16315 * <dd> 16316 * The parent has not imposed any constraint on the child. It can be whatever size 16317 * it wants. 16318 * </dd> 16319 * 16320 * <dt>EXACTLY</dt> 16321 * <dd> 16322 * The parent has determined an exact size for the child. The child is going to be 16323 * given those bounds regardless of how big it wants to be. 16324 * </dd> 16325 * 16326 * <dt>AT_MOST</dt> 16327 * <dd> 16328 * The child can be as large as it wants up to the specified size. 16329 * </dd> 16330 * </dl> 16331 * 16332 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16333 * is provided to pack and unpack the <size, mode> tuple into the int. 16334 */ 16335 public static class MeasureSpec { 16336 private static final int MODE_SHIFT = 30; 16337 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16338 16339 /** 16340 * Measure specification mode: The parent has not imposed any constraint 16341 * on the child. It can be whatever size it wants. 16342 */ 16343 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16344 16345 /** 16346 * Measure specification mode: The parent has determined an exact size 16347 * for the child. The child is going to be given those bounds regardless 16348 * of how big it wants to be. 16349 */ 16350 public static final int EXACTLY = 1 << MODE_SHIFT; 16351 16352 /** 16353 * Measure specification mode: The child can be as large as it wants up 16354 * to the specified size. 16355 */ 16356 public static final int AT_MOST = 2 << MODE_SHIFT; 16357 16358 /** 16359 * Creates a measure specification based on the supplied size and mode. 16360 * 16361 * The mode must always be one of the following: 16362 * <ul> 16363 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16364 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16365 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16366 * </ul> 16367 * 16368 * @param size the size of the measure specification 16369 * @param mode the mode of the measure specification 16370 * @return the measure specification based on size and mode 16371 */ 16372 public static int makeMeasureSpec(int size, int mode) { 16373 return size + mode; 16374 } 16375 16376 /** 16377 * Extracts the mode from the supplied measure specification. 16378 * 16379 * @param measureSpec the measure specification to extract the mode from 16380 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16381 * {@link android.view.View.MeasureSpec#AT_MOST} or 16382 * {@link android.view.View.MeasureSpec#EXACTLY} 16383 */ 16384 public static int getMode(int measureSpec) { 16385 return (measureSpec & MODE_MASK); 16386 } 16387 16388 /** 16389 * Extracts the size from the supplied measure specification. 16390 * 16391 * @param measureSpec the measure specification to extract the size from 16392 * @return the size in pixels defined in the supplied measure specification 16393 */ 16394 public static int getSize(int measureSpec) { 16395 return (measureSpec & ~MODE_MASK); 16396 } 16397 16398 /** 16399 * Returns a String representation of the specified measure 16400 * specification. 16401 * 16402 * @param measureSpec the measure specification to convert to a String 16403 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16404 */ 16405 public static String toString(int measureSpec) { 16406 int mode = getMode(measureSpec); 16407 int size = getSize(measureSpec); 16408 16409 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16410 16411 if (mode == UNSPECIFIED) 16412 sb.append("UNSPECIFIED "); 16413 else if (mode == EXACTLY) 16414 sb.append("EXACTLY "); 16415 else if (mode == AT_MOST) 16416 sb.append("AT_MOST "); 16417 else 16418 sb.append(mode).append(" "); 16419 16420 sb.append(size); 16421 return sb.toString(); 16422 } 16423 } 16424 16425 class CheckForLongPress implements Runnable { 16426 16427 private int mOriginalWindowAttachCount; 16428 16429 public void run() { 16430 if (isPressed() && (mParent != null) 16431 && mOriginalWindowAttachCount == mWindowAttachCount) { 16432 if (performLongClick()) { 16433 mHasPerformedLongPress = true; 16434 } 16435 } 16436 } 16437 16438 public void rememberWindowAttachCount() { 16439 mOriginalWindowAttachCount = mWindowAttachCount; 16440 } 16441 } 16442 16443 private final class CheckForTap implements Runnable { 16444 public void run() { 16445 mPrivateFlags &= ~PREPRESSED; 16446 setPressed(true); 16447 checkForLongClick(ViewConfiguration.getTapTimeout()); 16448 } 16449 } 16450 16451 private final class PerformClick implements Runnable { 16452 public void run() { 16453 performClick(); 16454 } 16455 } 16456 16457 /** @hide */ 16458 public void hackTurnOffWindowResizeAnim(boolean off) { 16459 mAttachInfo.mTurnOffWindowResizeAnim = off; 16460 } 16461 16462 /** 16463 * This method returns a ViewPropertyAnimator object, which can be used to animate 16464 * specific properties on this View. 16465 * 16466 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16467 */ 16468 public ViewPropertyAnimator animate() { 16469 if (mAnimator == null) { 16470 mAnimator = new ViewPropertyAnimator(this); 16471 } 16472 return mAnimator; 16473 } 16474 16475 /** 16476 * Interface definition for a callback to be invoked when a key event is 16477 * dispatched to this view. The callback will be invoked before the key 16478 * event is given to the view. 16479 */ 16480 public interface OnKeyListener { 16481 /** 16482 * Called when a key is dispatched to a view. This allows listeners to 16483 * get a chance to respond before the target view. 16484 * 16485 * @param v The view the key has been dispatched to. 16486 * @param keyCode The code for the physical key that was pressed 16487 * @param event The KeyEvent object containing full information about 16488 * the event. 16489 * @return True if the listener has consumed the event, false otherwise. 16490 */ 16491 boolean onKey(View v, int keyCode, KeyEvent event); 16492 } 16493 16494 /** 16495 * Interface definition for a callback to be invoked when a touch event is 16496 * dispatched to this view. The callback will be invoked before the touch 16497 * event is given to the view. 16498 */ 16499 public interface OnTouchListener { 16500 /** 16501 * Called when a touch event is dispatched to a view. This allows listeners to 16502 * get a chance to respond before the target view. 16503 * 16504 * @param v The view the touch event has been dispatched to. 16505 * @param event The MotionEvent object containing full information about 16506 * the event. 16507 * @return True if the listener has consumed the event, false otherwise. 16508 */ 16509 boolean onTouch(View v, MotionEvent event); 16510 } 16511 16512 /** 16513 * Interface definition for a callback to be invoked when a hover event is 16514 * dispatched to this view. The callback will be invoked before the hover 16515 * event is given to the view. 16516 */ 16517 public interface OnHoverListener { 16518 /** 16519 * Called when a hover event is dispatched to a view. This allows listeners to 16520 * get a chance to respond before the target view. 16521 * 16522 * @param v The view the hover event has been dispatched to. 16523 * @param event The MotionEvent object containing full information about 16524 * the event. 16525 * @return True if the listener has consumed the event, false otherwise. 16526 */ 16527 boolean onHover(View v, MotionEvent event); 16528 } 16529 16530 /** 16531 * Interface definition for a callback to be invoked when a generic motion event is 16532 * dispatched to this view. The callback will be invoked before the generic motion 16533 * event is given to the view. 16534 */ 16535 public interface OnGenericMotionListener { 16536 /** 16537 * Called when a generic motion event is dispatched to a view. This allows listeners to 16538 * get a chance to respond before the target view. 16539 * 16540 * @param v The view the generic motion event has been dispatched to. 16541 * @param event The MotionEvent object containing full information about 16542 * the event. 16543 * @return True if the listener has consumed the event, false otherwise. 16544 */ 16545 boolean onGenericMotion(View v, MotionEvent event); 16546 } 16547 16548 /** 16549 * Interface definition for a callback to be invoked when a view has been clicked and held. 16550 */ 16551 public interface OnLongClickListener { 16552 /** 16553 * Called when a view has been clicked and held. 16554 * 16555 * @param v The view that was clicked and held. 16556 * 16557 * @return true if the callback consumed the long click, false otherwise. 16558 */ 16559 boolean onLongClick(View v); 16560 } 16561 16562 /** 16563 * Interface definition for a callback to be invoked when a drag is being dispatched 16564 * to this view. The callback will be invoked before the hosting view's own 16565 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16566 * onDrag(event) behavior, it should return 'false' from this callback. 16567 * 16568 * <div class="special reference"> 16569 * <h3>Developer Guides</h3> 16570 * <p>For a guide to implementing drag and drop features, read the 16571 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16572 * </div> 16573 */ 16574 public interface OnDragListener { 16575 /** 16576 * Called when a drag event is dispatched to a view. This allows listeners 16577 * to get a chance to override base View behavior. 16578 * 16579 * @param v The View that received the drag event. 16580 * @param event The {@link android.view.DragEvent} object for the drag event. 16581 * @return {@code true} if the drag event was handled successfully, or {@code false} 16582 * if the drag event was not handled. Note that {@code false} will trigger the View 16583 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16584 */ 16585 boolean onDrag(View v, DragEvent event); 16586 } 16587 16588 /** 16589 * Interface definition for a callback to be invoked when the focus state of 16590 * a view changed. 16591 */ 16592 public interface OnFocusChangeListener { 16593 /** 16594 * Called when the focus state of a view has changed. 16595 * 16596 * @param v The view whose state has changed. 16597 * @param hasFocus The new focus state of v. 16598 */ 16599 void onFocusChange(View v, boolean hasFocus); 16600 } 16601 16602 /** 16603 * Interface definition for a callback to be invoked when a view is clicked. 16604 */ 16605 public interface OnClickListener { 16606 /** 16607 * Called when a view has been clicked. 16608 * 16609 * @param v The view that was clicked. 16610 */ 16611 void onClick(View v); 16612 } 16613 16614 /** 16615 * Interface definition for a callback to be invoked when the context menu 16616 * for this view is being built. 16617 */ 16618 public interface OnCreateContextMenuListener { 16619 /** 16620 * Called when the context menu for this view is being built. It is not 16621 * safe to hold onto the menu after this method returns. 16622 * 16623 * @param menu The context menu that is being built 16624 * @param v The view for which the context menu is being built 16625 * @param menuInfo Extra information about the item for which the 16626 * context menu should be shown. This information will vary 16627 * depending on the class of v. 16628 */ 16629 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16630 } 16631 16632 /** 16633 * Interface definition for a callback to be invoked when the status bar changes 16634 * visibility. This reports <strong>global</strong> changes to the system UI 16635 * state, not just what the application is requesting. 16636 * 16637 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16638 */ 16639 public interface OnSystemUiVisibilityChangeListener { 16640 /** 16641 * Called when the status bar changes visibility because of a call to 16642 * {@link View#setSystemUiVisibility(int)}. 16643 * 16644 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 16645 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 16646 * <strong>global</strong> state of the UI visibility flags, not what your 16647 * app is currently applying. 16648 */ 16649 public void onSystemUiVisibilityChange(int visibility); 16650 } 16651 16652 /** 16653 * Interface definition for a callback to be invoked when this view is attached 16654 * or detached from its window. 16655 */ 16656 public interface OnAttachStateChangeListener { 16657 /** 16658 * Called when the view is attached to a window. 16659 * @param v The view that was attached 16660 */ 16661 public void onViewAttachedToWindow(View v); 16662 /** 16663 * Called when the view is detached from a window. 16664 * @param v The view that was detached 16665 */ 16666 public void onViewDetachedFromWindow(View v); 16667 } 16668 16669 private final class UnsetPressedState implements Runnable { 16670 public void run() { 16671 setPressed(false); 16672 } 16673 } 16674 16675 /** 16676 * Base class for derived classes that want to save and restore their own 16677 * state in {@link android.view.View#onSaveInstanceState()}. 16678 */ 16679 public static class BaseSavedState extends AbsSavedState { 16680 /** 16681 * Constructor used when reading from a parcel. Reads the state of the superclass. 16682 * 16683 * @param source 16684 */ 16685 public BaseSavedState(Parcel source) { 16686 super(source); 16687 } 16688 16689 /** 16690 * Constructor called by derived classes when creating their SavedState objects 16691 * 16692 * @param superState The state of the superclass of this view 16693 */ 16694 public BaseSavedState(Parcelable superState) { 16695 super(superState); 16696 } 16697 16698 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16699 new Parcelable.Creator<BaseSavedState>() { 16700 public BaseSavedState createFromParcel(Parcel in) { 16701 return new BaseSavedState(in); 16702 } 16703 16704 public BaseSavedState[] newArray(int size) { 16705 return new BaseSavedState[size]; 16706 } 16707 }; 16708 } 16709 16710 /** 16711 * A set of information given to a view when it is attached to its parent 16712 * window. 16713 */ 16714 static class AttachInfo { 16715 interface Callbacks { 16716 void playSoundEffect(int effectId); 16717 boolean performHapticFeedback(int effectId, boolean always); 16718 } 16719 16720 /** 16721 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 16722 * to a Handler. This class contains the target (View) to invalidate and 16723 * the coordinates of the dirty rectangle. 16724 * 16725 * For performance purposes, this class also implements a pool of up to 16726 * POOL_LIMIT objects that get reused. This reduces memory allocations 16727 * whenever possible. 16728 */ 16729 static class InvalidateInfo implements Poolable<InvalidateInfo> { 16730 private static final int POOL_LIMIT = 10; 16731 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 16732 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 16733 public InvalidateInfo newInstance() { 16734 return new InvalidateInfo(); 16735 } 16736 16737 public void onAcquired(InvalidateInfo element) { 16738 } 16739 16740 public void onReleased(InvalidateInfo element) { 16741 element.target = null; 16742 } 16743 }, POOL_LIMIT) 16744 ); 16745 16746 private InvalidateInfo mNext; 16747 private boolean mIsPooled; 16748 16749 View target; 16750 16751 int left; 16752 int top; 16753 int right; 16754 int bottom; 16755 16756 public void setNextPoolable(InvalidateInfo element) { 16757 mNext = element; 16758 } 16759 16760 public InvalidateInfo getNextPoolable() { 16761 return mNext; 16762 } 16763 16764 static InvalidateInfo acquire() { 16765 return sPool.acquire(); 16766 } 16767 16768 void release() { 16769 sPool.release(this); 16770 } 16771 16772 public boolean isPooled() { 16773 return mIsPooled; 16774 } 16775 16776 public void setPooled(boolean isPooled) { 16777 mIsPooled = isPooled; 16778 } 16779 } 16780 16781 final IWindowSession mSession; 16782 16783 final IWindow mWindow; 16784 16785 final IBinder mWindowToken; 16786 16787 final Callbacks mRootCallbacks; 16788 16789 HardwareCanvas mHardwareCanvas; 16790 16791 /** 16792 * The top view of the hierarchy. 16793 */ 16794 View mRootView; 16795 16796 IBinder mPanelParentWindowToken; 16797 Surface mSurface; 16798 16799 boolean mHardwareAccelerated; 16800 boolean mHardwareAccelerationRequested; 16801 HardwareRenderer mHardwareRenderer; 16802 16803 boolean mScreenOn; 16804 16805 /** 16806 * Scale factor used by the compatibility mode 16807 */ 16808 float mApplicationScale; 16809 16810 /** 16811 * Indicates whether the application is in compatibility mode 16812 */ 16813 boolean mScalingRequired; 16814 16815 /** 16816 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 16817 */ 16818 boolean mTurnOffWindowResizeAnim; 16819 16820 /** 16821 * Left position of this view's window 16822 */ 16823 int mWindowLeft; 16824 16825 /** 16826 * Top position of this view's window 16827 */ 16828 int mWindowTop; 16829 16830 /** 16831 * Indicates whether views need to use 32-bit drawing caches 16832 */ 16833 boolean mUse32BitDrawingCache; 16834 16835 /** 16836 * Describes the parts of the window that are currently completely 16837 * obscured by system UI elements. 16838 */ 16839 final Rect mSystemInsets = new Rect(); 16840 16841 /** 16842 * For windows that are full-screen but using insets to layout inside 16843 * of the screen decorations, these are the current insets for the 16844 * content of the window. 16845 */ 16846 final Rect mContentInsets = new Rect(); 16847 16848 /** 16849 * For windows that are full-screen but using insets to layout inside 16850 * of the screen decorations, these are the current insets for the 16851 * actual visible parts of the window. 16852 */ 16853 final Rect mVisibleInsets = new Rect(); 16854 16855 /** 16856 * The internal insets given by this window. This value is 16857 * supplied by the client (through 16858 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 16859 * be given to the window manager when changed to be used in laying 16860 * out windows behind it. 16861 */ 16862 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 16863 = new ViewTreeObserver.InternalInsetsInfo(); 16864 16865 /** 16866 * All views in the window's hierarchy that serve as scroll containers, 16867 * used to determine if the window can be resized or must be panned 16868 * to adjust for a soft input area. 16869 */ 16870 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 16871 16872 final KeyEvent.DispatcherState mKeyDispatchState 16873 = new KeyEvent.DispatcherState(); 16874 16875 /** 16876 * Indicates whether the view's window currently has the focus. 16877 */ 16878 boolean mHasWindowFocus; 16879 16880 /** 16881 * The current visibility of the window. 16882 */ 16883 int mWindowVisibility; 16884 16885 /** 16886 * Indicates the time at which drawing started to occur. 16887 */ 16888 long mDrawingTime; 16889 16890 /** 16891 * Indicates whether or not ignoring the DIRTY_MASK flags. 16892 */ 16893 boolean mIgnoreDirtyState; 16894 16895 /** 16896 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 16897 * to avoid clearing that flag prematurely. 16898 */ 16899 boolean mSetIgnoreDirtyState = false; 16900 16901 /** 16902 * Indicates whether the view's window is currently in touch mode. 16903 */ 16904 boolean mInTouchMode; 16905 16906 /** 16907 * Indicates that ViewAncestor should trigger a global layout change 16908 * the next time it performs a traversal 16909 */ 16910 boolean mRecomputeGlobalAttributes; 16911 16912 /** 16913 * Always report new attributes at next traversal. 16914 */ 16915 boolean mForceReportNewAttributes; 16916 16917 /** 16918 * Set during a traveral if any views want to keep the screen on. 16919 */ 16920 boolean mKeepScreenOn; 16921 16922 /** 16923 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 16924 */ 16925 int mSystemUiVisibility; 16926 16927 /** 16928 * Hack to force certain system UI visibility flags to be cleared. 16929 */ 16930 int mDisabledSystemUiVisibility; 16931 16932 /** 16933 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 16934 * attached. 16935 */ 16936 boolean mHasSystemUiListeners; 16937 16938 /** 16939 * Set if the visibility of any views has changed. 16940 */ 16941 boolean mViewVisibilityChanged; 16942 16943 /** 16944 * Set to true if a view has been scrolled. 16945 */ 16946 boolean mViewScrollChanged; 16947 16948 /** 16949 * Global to the view hierarchy used as a temporary for dealing with 16950 * x/y points in the transparent region computations. 16951 */ 16952 final int[] mTransparentLocation = new int[2]; 16953 16954 /** 16955 * Global to the view hierarchy used as a temporary for dealing with 16956 * x/y points in the ViewGroup.invalidateChild implementation. 16957 */ 16958 final int[] mInvalidateChildLocation = new int[2]; 16959 16960 16961 /** 16962 * Global to the view hierarchy used as a temporary for dealing with 16963 * x/y location when view is transformed. 16964 */ 16965 final float[] mTmpTransformLocation = new float[2]; 16966 16967 /** 16968 * The view tree observer used to dispatch global events like 16969 * layout, pre-draw, touch mode change, etc. 16970 */ 16971 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 16972 16973 /** 16974 * A Canvas used by the view hierarchy to perform bitmap caching. 16975 */ 16976 Canvas mCanvas; 16977 16978 /** 16979 * The view root impl. 16980 */ 16981 final ViewRootImpl mViewRootImpl; 16982 16983 /** 16984 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 16985 * handler can be used to pump events in the UI events queue. 16986 */ 16987 final Handler mHandler; 16988 16989 /** 16990 * Temporary for use in computing invalidate rectangles while 16991 * calling up the hierarchy. 16992 */ 16993 final Rect mTmpInvalRect = new Rect(); 16994 16995 /** 16996 * Temporary for use in computing hit areas with transformed views 16997 */ 16998 final RectF mTmpTransformRect = new RectF(); 16999 17000 /** 17001 * Temporary list for use in collecting focusable descendents of a view. 17002 */ 17003 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 17004 17005 /** 17006 * The id of the window for accessibility purposes. 17007 */ 17008 int mAccessibilityWindowId = View.NO_ID; 17009 17010 /** 17011 * Whether to ingore not exposed for accessibility Views when 17012 * reporting the view tree to accessibility services. 17013 */ 17014 boolean mIncludeNotImportantViews; 17015 17016 /** 17017 * The drawable for highlighting accessibility focus. 17018 */ 17019 Drawable mAccessibilityFocusDrawable; 17020 17021 /** 17022 * Show where the margins, bounds and layout bounds are for each view. 17023 */ 17024 final boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 17025 17026 /** 17027 * Creates a new set of attachment information with the specified 17028 * events handler and thread. 17029 * 17030 * @param handler the events handler the view must use 17031 */ 17032 AttachInfo(IWindowSession session, IWindow window, 17033 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 17034 mSession = session; 17035 mWindow = window; 17036 mWindowToken = window.asBinder(); 17037 mViewRootImpl = viewRootImpl; 17038 mHandler = handler; 17039 mRootCallbacks = effectPlayer; 17040 } 17041 } 17042 17043 /** 17044 * <p>ScrollabilityCache holds various fields used by a View when scrolling 17045 * is supported. This avoids keeping too many unused fields in most 17046 * instances of View.</p> 17047 */ 17048 private static class ScrollabilityCache implements Runnable { 17049 17050 /** 17051 * Scrollbars are not visible 17052 */ 17053 public static final int OFF = 0; 17054 17055 /** 17056 * Scrollbars are visible 17057 */ 17058 public static final int ON = 1; 17059 17060 /** 17061 * Scrollbars are fading away 17062 */ 17063 public static final int FADING = 2; 17064 17065 public boolean fadeScrollBars; 17066 17067 public int fadingEdgeLength; 17068 public int scrollBarDefaultDelayBeforeFade; 17069 public int scrollBarFadeDuration; 17070 17071 public int scrollBarSize; 17072 public ScrollBarDrawable scrollBar; 17073 public float[] interpolatorValues; 17074 public View host; 17075 17076 public final Paint paint; 17077 public final Matrix matrix; 17078 public Shader shader; 17079 17080 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17081 17082 private static final float[] OPAQUE = { 255 }; 17083 private static final float[] TRANSPARENT = { 0.0f }; 17084 17085 /** 17086 * When fading should start. This time moves into the future every time 17087 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17088 */ 17089 public long fadeStartTime; 17090 17091 17092 /** 17093 * The current state of the scrollbars: ON, OFF, or FADING 17094 */ 17095 public int state = OFF; 17096 17097 private int mLastColor; 17098 17099 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17100 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17101 scrollBarSize = configuration.getScaledScrollBarSize(); 17102 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17103 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17104 17105 paint = new Paint(); 17106 matrix = new Matrix(); 17107 // use use a height of 1, and then wack the matrix each time we 17108 // actually use it. 17109 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17110 17111 paint.setShader(shader); 17112 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17113 this.host = host; 17114 } 17115 17116 public void setFadeColor(int color) { 17117 if (color != 0 && color != mLastColor) { 17118 mLastColor = color; 17119 color |= 0xFF000000; 17120 17121 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17122 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17123 17124 paint.setShader(shader); 17125 // Restore the default transfer mode (src_over) 17126 paint.setXfermode(null); 17127 } 17128 } 17129 17130 public void run() { 17131 long now = AnimationUtils.currentAnimationTimeMillis(); 17132 if (now >= fadeStartTime) { 17133 17134 // the animation fades the scrollbars out by changing 17135 // the opacity (alpha) from fully opaque to fully 17136 // transparent 17137 int nextFrame = (int) now; 17138 int framesCount = 0; 17139 17140 Interpolator interpolator = scrollBarInterpolator; 17141 17142 // Start opaque 17143 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17144 17145 // End transparent 17146 nextFrame += scrollBarFadeDuration; 17147 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17148 17149 state = FADING; 17150 17151 // Kick off the fade animation 17152 host.invalidate(true); 17153 } 17154 } 17155 } 17156 17157 /** 17158 * Resuable callback for sending 17159 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17160 */ 17161 private class SendViewScrolledAccessibilityEvent implements Runnable { 17162 public volatile boolean mIsPending; 17163 17164 public void run() { 17165 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17166 mIsPending = false; 17167 } 17168 } 17169 17170 /** 17171 * <p> 17172 * This class represents a delegate that can be registered in a {@link View} 17173 * to enhance accessibility support via composition rather via inheritance. 17174 * It is specifically targeted to widget developers that extend basic View 17175 * classes i.e. classes in package android.view, that would like their 17176 * applications to be backwards compatible. 17177 * </p> 17178 * <div class="special reference"> 17179 * <h3>Developer Guides</h3> 17180 * <p>For more information about making applications accessible, read the 17181 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17182 * developer guide.</p> 17183 * </div> 17184 * <p> 17185 * A scenario in which a developer would like to use an accessibility delegate 17186 * is overriding a method introduced in a later API version then the minimal API 17187 * version supported by the application. For example, the method 17188 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17189 * in API version 4 when the accessibility APIs were first introduced. If a 17190 * developer would like his application to run on API version 4 devices (assuming 17191 * all other APIs used by the application are version 4 or lower) and take advantage 17192 * of this method, instead of overriding the method which would break the application's 17193 * backwards compatibility, he can override the corresponding method in this 17194 * delegate and register the delegate in the target View if the API version of 17195 * the system is high enough i.e. the API version is same or higher to the API 17196 * version that introduced 17197 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17198 * </p> 17199 * <p> 17200 * Here is an example implementation: 17201 * </p> 17202 * <code><pre><p> 17203 * if (Build.VERSION.SDK_INT >= 14) { 17204 * // If the API version is equal of higher than the version in 17205 * // which onInitializeAccessibilityNodeInfo was introduced we 17206 * // register a delegate with a customized implementation. 17207 * View view = findViewById(R.id.view_id); 17208 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17209 * public void onInitializeAccessibilityNodeInfo(View host, 17210 * AccessibilityNodeInfo info) { 17211 * // Let the default implementation populate the info. 17212 * super.onInitializeAccessibilityNodeInfo(host, info); 17213 * // Set some other information. 17214 * info.setEnabled(host.isEnabled()); 17215 * } 17216 * }); 17217 * } 17218 * </code></pre></p> 17219 * <p> 17220 * This delegate contains methods that correspond to the accessibility methods 17221 * in View. If a delegate has been specified the implementation in View hands 17222 * off handling to the corresponding method in this delegate. The default 17223 * implementation the delegate methods behaves exactly as the corresponding 17224 * method in View for the case of no accessibility delegate been set. Hence, 17225 * to customize the behavior of a View method, clients can override only the 17226 * corresponding delegate method without altering the behavior of the rest 17227 * accessibility related methods of the host view. 17228 * </p> 17229 */ 17230 public static class AccessibilityDelegate { 17231 17232 /** 17233 * Sends an accessibility event of the given type. If accessibility is not 17234 * enabled this method has no effect. 17235 * <p> 17236 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17237 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17238 * been set. 17239 * </p> 17240 * 17241 * @param host The View hosting the delegate. 17242 * @param eventType The type of the event to send. 17243 * 17244 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17245 */ 17246 public void sendAccessibilityEvent(View host, int eventType) { 17247 host.sendAccessibilityEventInternal(eventType); 17248 } 17249 17250 /** 17251 * Sends an accessibility event. This method behaves exactly as 17252 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17253 * empty {@link AccessibilityEvent} and does not perform a check whether 17254 * accessibility is enabled. 17255 * <p> 17256 * The default implementation behaves as 17257 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17258 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17259 * the case of no accessibility delegate been set. 17260 * </p> 17261 * 17262 * @param host The View hosting the delegate. 17263 * @param event The event to send. 17264 * 17265 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17266 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17267 */ 17268 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17269 host.sendAccessibilityEventUncheckedInternal(event); 17270 } 17271 17272 /** 17273 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17274 * to its children for adding their text content to the event. 17275 * <p> 17276 * The default implementation behaves as 17277 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17278 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17279 * the case of no accessibility delegate been set. 17280 * </p> 17281 * 17282 * @param host The View hosting the delegate. 17283 * @param event The event. 17284 * @return True if the event population was completed. 17285 * 17286 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17287 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17288 */ 17289 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17290 return host.dispatchPopulateAccessibilityEventInternal(event); 17291 } 17292 17293 /** 17294 * Gives a chance to the host View to populate the accessibility event with its 17295 * text content. 17296 * <p> 17297 * The default implementation behaves as 17298 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17299 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17300 * the case of no accessibility delegate been set. 17301 * </p> 17302 * 17303 * @param host The View hosting the delegate. 17304 * @param event The accessibility event which to populate. 17305 * 17306 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17307 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17308 */ 17309 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17310 host.onPopulateAccessibilityEventInternal(event); 17311 } 17312 17313 /** 17314 * Initializes an {@link AccessibilityEvent} with information about the 17315 * the host View which is the event source. 17316 * <p> 17317 * The default implementation behaves as 17318 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17319 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17320 * the case of no accessibility delegate been set. 17321 * </p> 17322 * 17323 * @param host The View hosting the delegate. 17324 * @param event The event to initialize. 17325 * 17326 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17327 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17328 */ 17329 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17330 host.onInitializeAccessibilityEventInternal(event); 17331 } 17332 17333 /** 17334 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17335 * <p> 17336 * The default implementation behaves as 17337 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17338 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17339 * the case of no accessibility delegate been set. 17340 * </p> 17341 * 17342 * @param host The View hosting the delegate. 17343 * @param info The instance to initialize. 17344 * 17345 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17346 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17347 */ 17348 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17349 host.onInitializeAccessibilityNodeInfoInternal(info); 17350 } 17351 17352 /** 17353 * Called when a child of the host View has requested sending an 17354 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17355 * to augment the event. 17356 * <p> 17357 * The default implementation behaves as 17358 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17359 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17360 * the case of no accessibility delegate been set. 17361 * </p> 17362 * 17363 * @param host The View hosting the delegate. 17364 * @param child The child which requests sending the event. 17365 * @param event The event to be sent. 17366 * @return True if the event should be sent 17367 * 17368 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17369 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17370 */ 17371 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17372 AccessibilityEvent event) { 17373 return host.onRequestSendAccessibilityEventInternal(child, event); 17374 } 17375 17376 /** 17377 * Gets the provider for managing a virtual view hierarchy rooted at this View 17378 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17379 * that explore the window content. 17380 * <p> 17381 * The default implementation behaves as 17382 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17383 * the case of no accessibility delegate been set. 17384 * </p> 17385 * 17386 * @return The provider. 17387 * 17388 * @see AccessibilityNodeProvider 17389 */ 17390 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17391 return null; 17392 } 17393 } 17394} 17395